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  • 1.
    Aklilu, Yohannes T.
    et al.
    University of Skövde, SWE.
    Ding, Jianguo
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Survey on blockchain for smart grid management, control, and operation2022In: Energies, E-ISSN 1996-1073, Vol. 15, no 1, article id 193Article in journal (Refereed)
    Abstract [en]

    Power generation, distribution, transmission, and consumption face ongoing challenges such as smart grid management, control, and operation, resulting from high energy demand, the diversity of energy sources, and environmental or regulatory issues. This paper provides a comprehensive overview of blockchain-based solutions for smart grid management, control, and operations. We systematically summarize existing work on the use and implementation of blockchain technology in various smart grid domains. The paper compares related reviews and highlights the challenges in the management, control, and operation for a blockchain-based smart grid as well as future research directions in the five categories: collaboration among stakeholders; data analysis and data manage-ment; control of grid imbalances; decentralization of grid management and operations; and security and privacy. All these aspects have not been covered in previous reviews. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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  • 2. Al-Moathin, Ali Hussain Hassan
    Modeling of Photovoltaic Power System2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 3.
    Alves, Dimas, I
    et al.
    Fed Univ Pampa UNIPAMPA, BRA.
    Muller, Cristian
    Fed Univ Pampa UNIPAMPA, BRA.
    Vu, Viet Thuy
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Pettersson, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    de Jesus, Pablo Kunz
    Aeronaut Inst Technol ITA, BRA.
    Machado, Renato
    Aeronaut Inst Technol ITA, BRA.
    Uchoa-Filho, Bartolomeu E.
    Fed Univ Santa Catarina UFSC, BRA.
    Incoherent Change Detection Methods for Wavelength-Resolution SAR Image Stacks Based on Masking Techniques2020In: 2020 IEEE National Radar Conference - Proceedings, IEEE , 2020, article id 9266431Conference paper (Refereed)
    Abstract [en]

    This paper presents two incoherent change detection methods for wavelength-resolution synthetic aperture radars (SAR) image stacks based on masking techniques. The first technique proposed is the Simple Masking Detection (SMD). This method uses the statistical behavior of pixels-sets in the image stack to create a binary mask, which is used to remove pixels that are not related to changes in a surveillance image from the same interest region. The second technique is the Multiple Concatenated Masking Detection (MCMD), which produces a more selective mask than the SMD by concatenating multiple masks from different image stacks. The MCMD can be used in specific applications where multiple stacks share common patterns of target deployments. Both proposed techniques were evaluated using 24 incoherent SAR images obtained by the CARABAS II system. The experimental results revealed that the proposed detection methods have better performance in terms of probability of detection and false alarm rate when compared with other change detection techniques, especially for high detection probabilities scenarios.

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  • 4.
    Alves, Dimas I
    et al.
    Fed Univ Pampa UNIPAMPA, BRA.
    Palm, Bruna
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Pettersson, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Vu, Viet Thuy
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Machado, Renato
    Aeronaut Inst Technol ITA, BRA.
    Uchoa-Filho, Bartolomeu F.
    Fed Univ Santa Catarina UFSC, BRA.
    Dammert, Patrik
    Saab Elect Def Syst, SWE.
    Hellsten, Hans
    Saab Elect Def Syst, SWE.
    A Statistical Analysis for Wavelength-Resolution SAR Image Stacks2020In: IEEE Geoscience and Remote Sensing Letters, ISSN 1545-598X, E-ISSN 1558-0571, Vol. 17, no 2, p. 227-231Article in journal (Refereed)
    Abstract [en]

    This letter presents a clutter statistical analysis for stacks of wavelength-resolution synthetic aperture radar (SAR) images. Each image stack consists of SAR images generated by the same sensor, using the same flight track illuminating the same scene but with a time separation between the illuminations. We test three candidate statistical distributions for time changes in the stack, namely, Rician, Rayleigh, and log-normal. The tests results reveal that the Rician distribution is a very good candidate for modeling stack of wavelength-resolution SAR images, where 98.59 & x0025; of the tested samples passed the Anderson-Darling (AD) goodness-of-fit test. Also, it is observed that the presence of changes in the ground scene is related to the tested samples that have failed in the AD test for the Rician distribution hypothesis.

  • 5.
    Alves, Dimas Irion
    et al.
    Fed Univ Pampa, BRA.
    Palm, Bruna Gregory
    Aeronaut Inst Technol, BRA.
    Hellsten, Hans
    Saab AB, SWE.
    Vu, Viet Thuy
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Pettersson, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences. Blekinge Inst Technol, Karlskrona 37179, Sweden..
    Machado, Renato
    Aeronaut Inst Technol, Sao Jose Dos Campos 12228900, SP, Brazil..
    Uchoa-Filho, Bartolomeu F.
    Univ Fed Santa Catarina, Florianopolis 88040900, SC, Brazil..
    Dammert, Patrik
    Saab AB, Saab Surveillance, Gothenburg 41289, Sweden..
    Wavelength-Resolution SAR Change Detection Using Bayes' Theorem2020In: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, ISSN 1939-1404, E-ISSN 2151-1535, Vol. 13, p. 5560-5568Article in journal (Refereed)
    Abstract [en]

    This article presents Bayes' theorem for wavelength-resolution synthetic aperture radar (SAR) change detection method development. Different change detection methods can be derived using Bayes' theorem in combination with the target model, clutter-plus-noise model, iterative implementation, and noniterative implementation. As an example of the Bayes' theorem use for wavelength-resolution SAR change detection method development, we propose a simple change detection method with a clutter-plus-noise model and noniterative implementation. In spite of simplicity, the proposed method provides a very competitive performance in terms of probability of detection and false alarm rate. The best result was a probability of detection of $\text{98.7}\%$ versus a false alarm rate of one per square kilometer.

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  • 6.
    Alves, G. R.
    et al.
    Natércia Lima Polytechnic of Porto, PRT.
    Felgueiras, M.
    Natércia Lima Polytechnic of Porto, PRT.
    Viegas, C.
    Natércia Lima Polytechnic of Porto, PRT.
    Fidalgo, A.
    Natércia Lima Polytechnic of Porto, PRT.
    Castro, M.
    Universidad Nacional de Educación a Distancia, ESP.
    García-Zubía, J.
    niversidad de Deusto, ESP.
    Pester, A.
    Carinthia University of Applied Sciences, AUT.
    Pavani, A.
    Pontifícia Universidade Católica do Rio de Janeiro, BRA.
    Fernandez, R.
    Universidad Nacional de Santiago del Estero, ARG.
    Kulesza, Wlodek
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Pozzo, M. I.
    IRICE-CONICET, ARG.
    Oliveira, V.
    Universidade Federal de Juiz de Fora, BRA.
    Silva, J. B.
    Universidade Federal de Santa Catarina, BRA.
    Marchisio, S.
    Universidad Nacional de Rosario, ARG.
    Schlichting, L. C. M.
    nstituto Federal de Santa Catarina, BRA.
    A sustainable approach to let students do more real experiments with electrical and electronic circuits2018In: SIXTH INTERNATIONAL CONFERENCE ON TECHNOLOGICAL ECOSYSTEMS FOR ENHANCING MULTICULTURALITY (TEEM'18) / [ed] GarciaPenalvo, FJ, Association for Computing Machinery , 2018, p. 508-514Conference paper (Refereed)
    Abstract [en]

    The present paper focus on the use of remote laboratories in higher education from a sustainability viewpoint. The particular case of engineering education, and, within it, the more specific subject of experiments with electrical and electronic circuits is presented first, to then discuss the benefits of using remote labs, while considering the three dimensions of sustainable development, i.e.: economic practice, environmental protection, and social integration. The paper debates how remote labs address each dimension. © 2018 Copyright is held by the owner/author(s). Publication rights licensed to ACM.

  • 7.
    Anwar, Mahwish
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Connect2SmallPorts: An EU Project on Digitalizing Small Ports of the South Baltic Region. Poster ID: P20-206202020Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Ports play pivotal role in the global supply chain network. To strengthen the ports’ business and to keep up with the overall economic development of the country, the port stakeholders have started to invest in the digital technologies. The ports as well as the individual municipalities in Europe are in contest with other ports within the region. One of the competing factors is that of the port’s technological development. Unlike large ports, the small ports within Europe, for example Port of Karlskrona, Port of Wismar or Port of Klaipeda, which also serve as crucial nodes within the trade flow for Sweden, Germany and Lithuania respectively, lack the knowledge and tools to leverage the potential of digital technologies. The digital disruption at ports is inevitable!

    With that being established the scope of the project - South Baltic Small Ports as Gateways towards Integrated Sustainable European Transport System and Blue Growth by Smart Connectivity Solutions – or Connect2SmallPorts project is to understand how to facilitate small and medium ports of the South Baltic region with the digital technologies - Blockchain and Internet of Things. During the project lifetime (2018 to 2021) the main goals are to perform the digital audit of small ports of the South Baltic region; to prepare an implementation strategy for Blockchain and Internet of Things specifically for the small ports in the South Baltic region and to conduct an evaluation of the proposed strategies. The project correspondingly aims to disseminate the knowledge and experiences through research publications, industrial conferences and international tradeshows.

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  • 8.
    Anwar, Mahwish
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Connect2smallports Project: South Baltic Small Ports – Gateway to Integratedand Sustainable European Transport System: Project brief and updates on the project activities: Digital Audit. Blockchain Design Strategy. Call for Collaboration. Reports and scientific publications.2019Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Ports play pivotal role in the global supply chain network. To strengthen the ports’ business and to keep up with the overall economic development of the country, the port stakeholders have started to invest in the digital technologies. The ports as well as the individual municipalities in Europe are in contest with other ports within the region. One of the competing factors is that of the port’s technological development. Unlike large ports, the small ports within Europe, for example Port of Karlskrona, Port of Wismar or Port of Klaipeda, which also serve as crucial nodes within the trade flow for Sweden, Germany and Lithuania respectively, lack the knowledge and tools to leverage the potential of digital technologies. The digital disruption at ports is inevitable!

    With that being established the scope of the project - South Baltic Small Ports as Gateways towards Integrated Sustainable European Transport System and Blue Growth by Smart Connectivity Solutions – or Connect2SmallPorts project is to understand how to facilitate small and medium ports of the South Baltic region with the digital technologies - Blockchain and Internet of Things. During the project lifetime (2018 to 2021) the main goals are to perform the digital audit of small ports of the South Baltic region; to prepare an implementation strategy for Blockchain and Internet of Things specifically for the small ports in the South Baltic region and to conduct an evaluation of the proposed strategies. The project correspondingly aims to disseminate the knowledge and experiences through research publications, industrial conferences and international tradeshows.

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    Mahwish-Anwar_Connect2SmallPorts_Digitalization_Blockchain_South-Baltic_Blue-Science-Park_Presentation_Sweden
  • 9.
    Anwar, Mahwish
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Henesey, Lawrence
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Casalicchio, Emiliano
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Digitalization in Container Terminal Logistics: A Literature Review2019In: 27th Annual Conference of International Association of Maritime Economists (IAME), 2019, p. 1-25, article id 141Conference paper (Refereed)
    Abstract [en]

    Many terminals that are located in large ports, such as Port of Rotterdam, Port of Singapore, Port of Hamburg, etc. employ various emerging digital technologies to handle container and information. Some technologies deemed attractive by large ports are: Artificial Intelligence (AI), Cloud Computing, Blockchain and Internet of Things (IoT). The objective of this paper is to review the “state-of-the-art” of scientific literature on digital technologies that facilitate operations management for container terminal logistics. The studies are synthesized in form of a classification matrix and analysis performed. The primary studies consisted of 57 papers, out of the initial pool of over 2100 findings. Over 94% of the publications identified focused on AI; while 29% exploited IoT and Cloud Computing technologies combined. The research on Blockchain within the context of container terminal was nonexistent. Majority of the publications utilized numerical experiments and simulation for validation. A large amount of the scientific literature was dedicated to resource management and scheduling of intra-logistic equipment/vessels or berth or container storage in the yard. Results drawn from the literature survey indicate that various research gaps exist. A discussion and an analysis of review is presented, which could be of benefit for stakeholders of small-medium sized container terminals.

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  • 10.
    Anwar, Mahwish
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Henesey, Lawrence
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Casalicchio, Emiliano
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    The feasibility of Blockchain solutions in the maritime industry2019Conference paper (Other academic)
    Abstract [en]

    Purpose / Value

    The concept of Blockchain technology in supply chain management is well discussed, yet

    inadequately theorized in terms of its applicability, especially within the maritime industry,

    which forms a fundamental node of the entire supply chain network. More so, the assumptive

    grounds associated with the technology have not been openly articulated, leading to unclear

    ideas about its applicability.

    Design/methodology/approach

    The research is designed divided into two Stages. This paper (Stage one) enhanced

    literature review for data collection in order to gauge the properties of the Blockchain

    technology, and to understand and map those characteristics with the Bill of Lading

    process within maritime industry. In Stage two an online questionnaire is conducted to

    assess the feasibility of Blockchain technology for different maritime use-cases.

    Findings

    The research that was collected and analysed partly from deliverable in the

    Connect2SmallPort Project and from other literature suggests that Blockchain can be an

    enabler for improving maritime supply chain. The use-case presented in this paper highlights

    the practicality of the technology. It was identified that Blockchain possess characteristics

    suitable to mitigate the risks and issues pertaining to the paper-based Bill of Lading process.

    Research limitations

    The study would mature further after the execution of the Stage Two. By the end of both

    Stages, a framework for Blockchain adoption with a focus on the maritime industry would

    be proposed.

    Practical implications

    The proposed outcome indicated the practicality of technology, which could be beneficial

    for the port stakeholders that wish to use Blockchain in processing Bill of Lading or

    contracts.

    Social implications

    The study may influence the decision makers to consider the benefits of using the Blockchain

    technology, thereby, creating opportunities for the maritime industry to leverage the

    technology with government’s support.

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  • 11.
    Arvidsson, Mattias
    Blekinge Institute of Technology, School of Computing.
    Säkerhetsmedvetenhet: En kvantitativ studie beträffande mätning av säkerhetsmedvetenhet hos medarbetare2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport syftar till att besvara tre frågeställningar; går det att mäta säkerhetsmedvetenhet, vilka variabler påverkar säkerhetsmedvetenheten samt är skillnaderna i variablerna signifikanta. Undersökningen har genomförts i en region och av yrkeskategorin brevbärare, inom företaget Posten Meddelande AB. För att besvara de tre frågeställningarna har en omfattande enkätundersökning genomförts på tio arbetsplatser, där ett dataunderlag på 164 svar inhämtats.  Underlaget har indexerats till ett index som är avsett att beskriva hur god säkerhetsmedvetenhet de svarande har. Säkerhetsmedvetenhetsindexet har sedan analyserats med olika sambandsanalyser för att se om de oberoende variablerna påverkar resultatet. Totalt har sju oberoende variabler analyserats, och av dessa har fem påverkat resultatet.  Till sist har dessa fem testats med medelvärdes- och variansanalyser för att se om skillnaderna i grupperna är signifikanta. Resultatet av det visar att skillnaderna är signifikanta och i princip alla med mer hög tillförlitlighet. Slutsatsen av dessa analyser är att äldre personer som jobbat länge inom Posten Meddelande och genomgått en säkerhetsutbildning har statistiskt säkerställt bättre säkerhetsmedvetenhet. Då ålder och erfarenhet är omöjligt att erhålla på kort sikt, anser författaren att den viktigaste framgångsfaktorn för att uppnå god säkerhetsmedvetenhet är att alla inom företaget bör genomgå en säkerhetsutbildning.

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    BTH2016Arvidsson
  • 12.
    Badampudi, Deepika
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Towards decision-making to choose among different component origins2016Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Context: The amount of software in solutions provided in various domains is continuously growing. These solutions are a mix of hardware and software solutions, often referred to as software-intensive systems. Companies seek to improve the software development process to avoid delays or cost overruns related to the software development.  

    Objective: The overall goal of this thesis is to improve the software development/building process to provide timely, high quality and cost efficient solutions. The objective is to select the origin of the components (in-house, outsource, components off-the-shelf (COTS) or open source software (OSS)) that facilitates the improvement. The system can be built of components from one origin or a combination of two or more (or even all) origins. Selecting a proper origin for a component is important to get the most out of a component and to optimize the development. 

    Method: It is necessary to investigate the component origins to make decisions to select among different origins. We conducted a case study to explore the existing challenges in software development.  The next step was to identify factors that influence the choice to select among different component origins through a systematic literature review using a snowballing (SB) strategy and a database (DB) search. Furthermore, a Bayesian synthesis process is proposed to integrate the evidence from literature into practice.  

    Results: The results of this thesis indicate that the context of software-intensive systems such as domain regulations hinder the software development improvement. In addition to in-house development, alternative component origins (outsourcing, COTS, and OSS) are being used for software development. Several factors such as time, cost and license implications influence the selection of component origins. Solutions have been proposed to support the decision-making. However, these solutions consider only a subset of factors identified in the literature.   

    Conclusions: Each component origin has some advantages and disadvantages. Depending on the scenario, one component origin is more suitable than the others. It is important to investigate the different scenarios and suitability of the component origins, which is recognized as future work of this thesis. In addition, the future work is aimed at providing models to support the decision-making process.

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  • 13.
    Battina, Devi Priya
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Padhi, Simon
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Drone hovering control using Simulink: Sensor Study2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 14.
    Bechter, Jonathan
    et al.
    Ulm Univ, DEU.
    Rameez, Muhammad
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Waldschmidt, Christian
    Ulm Univ, DEU.
    Analytical and Experimental Investigations on Mitigation of Interference in a DBF MIMO Radar2017In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 65, no 5, p. 1727-1734Article in journal (Refereed)
    Abstract [en]

    As driver assistance systems and autonomous driving are on the rise, radar sensors become a common device for automobiles. The high sensor density leads to the occurrence of interference, which decreases the detection capabilities. Here, digital beamforming (DBF) is applied to mitigate such interference. A DBF system requires a calibration of the different receiving channels. It is shown how this calibration completely changes the DBF beam pattern required to cancel interferences, if the system has no IQ receiver. Afterward, the application of DBF on a multiple-input multiple-output (MIMO) radar is investigated. It is shown that only the real aperture and not the virtual one can be used for interference suppression, leading to wide notches in the pattern. However, for any target the large virtual aperture can be exploited, even if interferers are blinded out. Moreover, the wide notches for interference suppression of the real aperture appear narrow in the virtual aperture for target localization. The results are verified by measurements with time-multiplexing MIMO radar.

  • 15.
    Bjorklund, Svante
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Johansson, Tommy
    Swedish Def Res Agcy FOI, SE-58111 Linkoping, Sweden..
    Petersson, Henrik
    Swedish Def Res Agcy FOI, SE-58111 Linkoping, Sweden..
    Target Classification in Perimeter Protection with a Micro-Doppler Radar2016In: 2016 17TH INTERNATIONAL RADAR SYMPOSIUM (IRS), 2016Conference paper (Refereed)
    Abstract [en]

    In security surveillance at the perimeter of critical infrastructure, such as airports and power plants, approaching objects have to be detected and classified. Especially important is to distinguish between humans, animals and vehicles. In this paper, micro-Doppler data (from movement of internal parts of the target) have been collected with a small radar of a low complexity and cost-effective type. From time-velocity diagrams of the data, some physical features have been extracted and used in a support vector machine classifier to distinguish between the classes "human", "animal" and "man-made object". Both the type of radar and the classes are suitable for perimeter protection. The classification result are rather good, 77% correct classification. Particularly interesting is the surprisingly good ability to distinguish between humans and animals. This also indicates that we can choose to have limitations in the radar and still solve the classification task.

  • 16.
    Björklund, Svante
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Clutter Properties for a Side-Looking Radar with Planar Regular and Irregular Subarrays2015In: 2015 16TH INTERNATIONAL RADAR SYMPOSIUM (IRS), 2015, p. 730-735Conference paper (Refereed)
    Abstract [en]

    The effect of the subarray design in a side-looking moving radar with a planar antenna on some clutter properties which are important for suppressing the clutter with STAP (Space-Time Adaptive Processing) is investigated by simulations. These properties are interference DOA Doppler Spectrum (DDS) and clutter rank. The conclusions from the work is that irregular antennas give less clutter in the DDS and that larger subarrays give lower clutter rank.

  • 17.
    Björklund, Svante
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Grahn, Per
    Nelander, Anders
    Pettersson, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Measurement of Rank and Other Properties of Direct and Scattered Signals2016In: International Journal of Antennas and Propagation, ISSN 1687-5869, E-ISSN 1687-5877, Vol. 2016, article id 5483547Article in journal (Refereed)
    Abstract [en]

    We have designed an experiment for low-cost indoor measurements of rank and other properties of direct and scattered signals with radar interference suppression in mind. The signal rank is important also in many other applications, for example, DOA (Direction of Arrival) estimation, estimation of the number of and location of transmitters in electronic warfare, and increasing the capacity in wireless communications. In real radar applications, such measurements can be very expensive, for example, involving airborne radars with array antennas. We have performed the measurements in an anechoic chamber with several transmitters, a receiving array antenna, and a moving reflector. Our experiment takes several aspects into account: transmitted signals with different correlation, decorrelation of the signals during the acquisition interval, covariance matrix estimation, noise eigenvalue spread, calibration, near-field compensation, scattering in a rough surface, and good control of the influencing factors. With our measurements we have observed rank, DOA spectrum, and eigenpatterns of direct and scattered signals. The agreement of our measured properties with theoretic and simulated results in the literature shows that our experiment is realistic and sound. The detailed description of our experiment could serve as help for conducting other well-controlled experiments. © Copyright 2016 Svante Björklund et al.

  • 18.
    Björklund, Svante
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Nelander, Anders
    Swedish Def Res Agcy FOI, SWE.
    Pettersson, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences. Blekinge Inst Technol, Karlskrona, Sweden..
    Fast-Time and Slow-Time Space-Time Adaptive Processing for Bistatic Radar Interference Suppression2015In: 2015 IEEE INTERNATIONAL RADAR CONFERENCE (RADARCON), IEEE Communications Society, 2015, p. 674-678Conference paper (Refereed)
    Abstract [en]

    In bistatic radar with transmitter and receiver geographically separated the interference from ground clutter and the direct path signal transmitter-receiver will be strong and must be suppressed in order to detect the target. We apply FT-STAP (Fast-Time Space Time Adaptive Processing) to the suppression, which is unusual, and compare with conventional ST-STAP (Slow-Time STAP) by simulations in order to see whether FT-STAP is an alternative to ST-STAP. The performance of FT-STAP is much worse than of ST-STAP. We give an explanation for this, which also may be the basis for large improvements of FT-STAP. Moreover, we suggest two new performance measures.

  • 19.
    Björklund, Svante
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Rydell, Joakim
    Totalforsvarets forskningsinstitut, SWE.
    Micro-doppler classification with boosting in perimeter protection2017In: IET Conference Publications, Institution of Engineering and Technology , 2017, no CP728Conference paper (Refereed)
    Abstract [en]

    In security surveillance at the perimeter of critical infrastructure, such as airports and power plants, approaching objects have to be detected and classified. Especially important is to distinguish between humans, animals and vehicles. In this paper, micro-Doppler data (from movement of internal parts of the target) have been collected with a small radar. From time-velocity diagrams of the data, physical features have been extracted and used in a Boosting classifier to distinguish between the classes "human", "animal" and "man-made object". This type of classifier has received much attention lately, but not in radar micro-Doppler classification. The classification result on the current data reaches 90% correct classification with this classifier. The ability to distinguish between humans and animals is good on this data. This classifier type gives insight into the classifier and the utilized features, and is easy to use. A comparison with a SVM (Support Vector Machine) classifier, which is common for micro-Doppler, has also been performed. © 2017 Institution of Engineering and Technology. All rights reserved.

  • 20.
    Bork-Ceszlak, Krzysztof
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Żydanowicz, Tadeusz
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Multisensory Expert-Based Support System for the Firefighter’s Training Performance Evaluation2018Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The primary purpose of this thesis work is to design and implement a system supporting the fire-fighter’straining evaluation. The solution presented in this report comprises a real-time locating system andInertial Measurement Unit that collect the training data and an application built with the Unity3D gameengine used for processing.

    Before the presented application can process any data, a training facility must be recreated, and atrainer or an expert must define training guidelines, such as zones that a trainee must visit, objectshe/she has to see, and the required execution time. After this preparation and completed trainingsession, collected data is processed and the visualization together with evaluation process begins. Theprogram visualizes trainee’s position and his/her field of view and evaluates his performance. For thelatter, it uses the Unity3D collision detection feature. After the evaluation, the trainer can see detailedresults with recorded time stamps, and using them, he/she can fast forward to specific, important points,reducing the time to analyze trainee’s performance throughout the whole training.

    Tests which the authors conducted confirm that the built system meets requirements and is useful forevaluation of the trainee’s performance.

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    BTHCeszlakZydanovicz
  • 21.
    Branco, Matheus
    et al.
    950 - Centro, Federal Institute of Santa Catarina, BRA.
    Coelho, Leticia
    Federal Institute of Santa Catarina, BRA.
    Schlichting, Louis
    950 - Centro, Federal Institute of Santa Catarina, BRA.
    Gustavsson, Ingvar
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Marques, Maria Arcelina
    Instituto Politcnico do Porto, PRT.
    Alves, Gustavo
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Differentiating simulations and real (remote) experiments2017In: ACM International Conference Proceeding Series, Association for Computing Machinery , 2017Conference paper (Refereed)
    Abstract [en]

    The more recent emergence of remote laboratories caused some discussions about their real educational value, when compared to traditional hands-on and virtual laboratories. This discussion is relevant because remote labs rely on computer-mediated access to real instruments and apparatus, being sometimes difficult to explain the difference between values obtained from real (remote) measurements and values obtained from computer simulations. This paper aims to evidence aspects that differentiate remote and virtual laboratories, by presenting two very simple experiments dealing with the characteristics of real instruments (limited bandwidth) and real circuits (electromagnetic interference). © 2017 Association for Computing Machinery.

  • 22. Chandu, Chiranjeevi
    Region of Interest Aware and Impairment Based Image Quality Assessment2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
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    BTH2016Chiranjeevi
  • 23.
    Dalarsson, Mariana
    et al.
    KTH, SWE.
    Ivanenko, Yevhen
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Nordebo, Sven
    Linnaeus Univ, SWE.
    Wave propagation in waveguides with graded plasmonic obstacles2021In: Journal of the Optical Society of America. B, Optical physics, ISSN 0740-3224, E-ISSN 1520-8540, Vol. 38, no 1, p. 104-113Article in journal (Refereed)
    Abstract [en]

    In this paper, wave propagation in a hollow waveguide with a graded dielectric layer is studied. Analytic formulas are derived for the electric field components as well as general analytical results for the reflection and transmission coefficients for propagating waves. These results are all valid for waveguides of arbitrary cross sections, and the derived reflection and transmission coefficients are in exact asymptotic agreement with those obtained for a wry thin homogeneous dielectric layer using cascading and mode-matching techniques. Furthermore, the power transmission, reflection, and absorption coefficients, as functions of frequency and layer width, are studied, showing the expected behavior of these parameters. The method proposed in this paper gives directly applicable results that do not require cascading and mode matching, while at the same time having the ability to model smooth transitions that are more realistic in several applications. (C) 2020 Optical Society of America

  • 24.
    Das, Deepayan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Shukla, Aditya Muktesh Kumar
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    An experimental study on the impact of requirement communication on the quality and efficiency of writing test cases2022Independent thesis Advanced level (professional degree), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    Requirements are fundamental to software development. They establish the foundation and scope of a software project. They determine the features that are to be developed. The entire project goal, for all stake-holders, is determined by the requirements gathered and how they are implemented. Stakeholders, like developers and testers, prepare their artifacts and develop components based on the requirements provided to them. It is important that the requirements are communicated to each stakeholder as they are intended. All stakeholders should understand the requirements as they are meant for the success of a project. The manner in which requirements are communicated is an essential element in ensuring the success of a software product. It is believed that written communication supplemented by verbal communication leads to a better quality of software. The aim of this study is to understand the magnitude of the im-pact of written and verbal communication of requirements on the quality of test cases and the efficiency of creating them for functional requirements. For this study, we have conducted a quasi-experiment wherein we provide experienced testers with abstract and concrete requirements and measure the impact of the mode of communication on the quality of test cases written. Our results suggest that verbal communication of requirements aids in creating good-quality test cases. But the quality comes at a cost of the efficiency of writing the test cases. The experiment shows that because of the additional verbal communication, the efficiency in creating test cases, measured in time, becomes lower, i.e. the quality of test cases increases, but creating them becomes less efficient.

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    An experimental study on the impact of requirement communication on the quality and efficiency of writing test cases
  • 25.
    Dhont, Michiel
    et al.
    EluciDATA Lab of Sirris, BEL.
    Tsiporkova, Elena
    EluciDATA Lab of Sirris, BEL.
    Boeva, Veselka
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Advanced discretisation and visualisation methods for performance profiling of wind turbines2021In: Energies, E-ISSN 1996-1073, Vol. 14, no 19, article id 6216Article in journal (Refereed)
    Abstract [en]

    Wind turbines are typically organised as a fleet in a wind park, subject to similar, but varying, environmental conditions. This makes it possible to assess and benchmark a turbine’s output performance by comparing it to the other assets in the fleet. However, such a comparison cannot be performed straightforwardly on time series production data since the performance of a wind turbine is affected by a diverse set of factors (e.g., weather conditions). All these factors also produce a continuous stream of data, which, if discretised in an appropriate fashion, might allow us to uncover relevant insights into the turbine’s operations and behaviour. In this paper, we exploit the outcome of two inherently different discretisation approaches by statistical and visual analytics. As the first discretisation method, a complex layered integration approach is used. The DNA-like outcome allows us to apply advanced visual analytics, facilitating insightful operating mode monitoring. The second discretisation approach is applying a novel circular binning approach, capitalising on the circular nature of the angular variables. The resulting bins are then used to construct circular power maps and extract prototypical profiles via non-negative matrix factorisation, enabling us to detect anomalies and perform production forecasts. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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  • 26.
    Eivazzadeh, Shahryar
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Evaluating Success Factors of Health Information Systems2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Health information systems are our technological response to the growing demand for health care. However, their success in their mission can be challenging due to the complexity of evaluating technological interventions in health care. In the series of studies compiled in this dissertation, we looked at the evaluation of these systems. We focused on the evaluation of factors that lead to success, where success is indicated by user satisfaction and can be induced by both intervention-specific and individual-specific factors.

    Study 1 developed a method, called UVON, to elicit and organise the user-demanded qualities in the outcomes of the health information system intervention. Through the application of the UVON method in the FI-STAR project, an EU project which developed and deployed seven e-health applications in seven member countries, ten categories of quality and their subcategories were identified. These qualities formed two questionnaires, specific to the patient and health professional users. Through the questionnaires, the patients and health-professionals users evaluated and graded both the occurrence of those demanded qualities in the project outcomes and their general satisfaction.

    Study 2 analysed the survey results to find out which of those ten qualities have the highest impact on satisfaction or can predict it better. Two partial least squares structural equation modelling (PLS-SEM) models were constructed, for the patient and health professionals, based on the Unified eValuation using ONtology (UVON) and survey outputs. The models showed that effectiveness is an important quality in creating satisfaction for both user groups. Besides, affordability for the health professionals and efficiency plus safety for the patients were the most influential. A satisfaction index is also introduced for simple and fast inferring of the changes in the outcome qualities.

    Study 5 recruited outputs and learnings from studies 1 and 2 to design a system that partially automates the process of evaluating success factors in health information systems, making it continuous and real-time, and replacing hard-to-run surveys with automatically captured indicators and analytics.

    Study 3 focused on individual-specific factors in using health information systems, particularly the technophilia personality trait. A short six-items instrument, called TechPH, was designed to measure technophilia in users, tuned for older users. The study recruited empirical data from the Swedish National Study on Aging and Care (SNAC) project. Two factors, labelled techAnxiety and techEnthusiams, are identified by the factor analysis method. A TechPH score was introduced as a scalar measurement of technophilia.

    Study 4 elicited and discussed the ethical challenges of evaluating and researching health information systems. Both a scoping review and a novel systematic postulation approach were recruited to identify twenty ethical challenges. The identified ethical challenges were discussed and mapped into a three-dimensional space of evaluation stages, demanded qualities, and major involving entities (stakeholder and artefacts), which fosters further postulation of ethical challenges.

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  • 27.
    Fabrin, Ana
    et al.
    Universidade Federal de Santa Maria, BRA.
    Molin, Ricardo
    Universidade Federal de Santa Maria, BRA.
    Alves, Dimas Irion
    Universidade Federal do Pampa, BRA.
    Machado, Renato
    Universidade Federal de Santa Maria, BRA.
    Bayer, Fabio
    Universidade Federal de Santa Maria, BRA.
    Pettersson, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    A CFAR optimization for low frequency UWB SAR change detection algorithms2017In: International Geoscience and Remote Sensing Symposium (IGARSS), Institute of Electrical and Electronics Engineers Inc. , 2017, p. 1071-1074Conference paper (Refereed)
    Abstract [en]

    This paper presents a study on the constant false alarm rate (CFAR) filter design for change detection algorithms (CDA). More specifically, we are interested in CFAR filters used in CDA for low frequency ultra-wideband (UWB) synthetic aperture radar (SAR) systems. The filter design performance was evaluated in terms of false alarm rate (FAR) and probability of detection (PD). For evaluation purposes, we considered a set of SAR images obtained with the CARABAS-II system. The results are compared with the ones presented in [1], where the same CDA was considered, except for the CFAR filter. The results show that relevant FAR performance improvements can be obtained by just modifying the CFAR filter parameters taking into account the image resolution and target characteristics. © 2017 IEEE.

  • 28.
    Felgueiras, C.
    et al.
    Polytechnic of Porto, PRT.
    Costa, R.
    Polytechnic of Porto, PRT.
    Alves, G. R.
    Polytechnic of Porto, PRT.
    Viegas, C.
    Polytechnic of Porto, PRT.
    Fidalgo, A.
    Polytechnic of Porto, PRT.
    Marques, M. A.
    Polytechnic of Porto, PRT.
    Lima, N.
    Polytechnic of Porto, PRT.
    Castro, M.
    Universidad Nacional de Educación A Distancia, ESP.
    García-Zubía, J.
    Universidad de Deusto, ESP.
    Pester, A.
    Carinthia University of Applied Sciences, AUT.
    Kulesza, Wlodek
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Silva, J. B.
    Universidade Federal de Santa Catarina, BRA.
    Pavani, A.
    Pontifícia Universidade Católica Do Rio de Janeiro, BRA.
    Pozzo, M. I.
    IRICE-CONICET, ARG.
    Marchisio, S.
    Universidad Nacional de Rosario, ARG.
    Fernandez, R.
    Universidad Nacional de Santiago Del Estero, ARG.
    Oliveira, V.
    Universidade Federal de Juiz de Fora, BRA.
    Schlichting, L. C. M.
    nstituto Federal de Santa Catarina, BRA.
    A sustainable approach to laboratory experimentation2019In: TEEM'19: SEVENTH INTERNATIONAL CONFERENCE ON TECHNOLOGICAL ECOSYSTEMS FOR ENHANCING MULTICULTURALITY / [ed] Gonzalez, MAC; Sedano, FJR; Llamas, CF; GarciaPenalvo, FJ, Association for Computing Machinery , 2019, p. 500-506Conference paper (Refereed)
    Abstract [en]

    Sustainability is currently a general concern in society and in particular in the use of laboratories for educational purposes. Although laboratories are unavoidable facilities for education, they often produce waste resulting from students' experiments. To contribute for sustainable solutions in education, the use of remote laboratories instead of the traditional hands-on laboratories should be considered in every engineering course. It is precisely this aspect that is discussed in the current paper. Some comments about the importance of sustainability in education are made. Later, it is described the use of a remote laboratory named VISIR in a course held at the Polytechnic of Porto - School of Engineering, for the conduction of an electronic experiment named Schmitt Trigger. At the end, some comments about the contribution of this remote lab for sustainability in education, are provided. © 2019 ACM.

  • 29.
    Fiedler, Markus
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Chapala, Usha Kiran
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Peteti, Sridhar
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Modeling instantaneous quality of experience using machine learning of model trees2019In: 2019 11th International Conference on Quality of Multimedia Experience, QoMEX 2019, Institute of Electrical and Electronics Engineers Inc. , 2019Conference paper (Refereed)
    Abstract [en]

    For service providers and operators, successful root cause analysis is essential for satisfactory service provisioning. However, reasons for sudden trend changes of the instantaneous Quality of Experience (QoE) may not always be immediately visible from underlying service- or network-level monitoring data. Thus, there is the challenge to pinpoint such moments of change in provisioning, and model the impact on instantaneous QoE, as a lead in root cause analysis. This work investigates the potential of Machine Learning (ML) of deriving time-interval-based models for instantaneous QoE ratings, obtained from a set of publicly available rating traces. In particular, the paper demonstrates the capability of the ML algorithm M5P to model trends of instantaneous QoE through model trees, consisting of piecewise linear functions over time. It is shown how and to which extent these functions can be used to estimate moments of change. Furthermore, the model trees support earlier assumptions about exponential shapes of instantaneous QoE over time as reactions to sudden changes of provisioning, such as video freezes. © 2019 IEEE.

  • 30.
    Fiedler, Markus
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Moller, Sebastian
    Technical University of Berlin, DEU.
    Reichl, Peter
    University of Vienna, AUT.
    Xie, Min
    Telenor Research, NOR.
    A Glance at the Dagstuhl Manifesto 'QoE Vadis?'2018In: 2018 10th International Conference on Quality of Multimedia Experience, QoMEX 2018, Institute of Electrical and Electronics Engineers Inc. , 2018, article id 8463374Conference paper (Refereed)
    Abstract [en]

    This short paper presents the recently published Dagstuhl Manifesto 'QoE Vadis?'. The Manifesto is the result of a set of three Dagstuhl Seminars and one Dagstuhl Perspectives Workshop, aimed at shaping understanding, development and application of the Quality of Experience (QoE) notion and concept. Its task is to convey the current status, promising developments and future projections for different stakeholders. The latter are summarised in a set of eleven recommendations to academia, industry and funding organisations. © 2018 IEEE.

  • 31.
    Fiedler, Markus
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Zepernick, Hans-Juergen
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Kelkkanen, Viktor
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Network-induced temporal disturbances in virtual reality applications2019In: 2019 11th International Conference on Quality of Multimedia Experience, QoMEX 2019, Institute of Electrical and Electronics Engineers Inc. , 2019Conference paper (Refereed)
    Abstract [en]

    Virtual Reality (VR) applications put high demands on software and hardware in order to enable an immersive experience for the user and avoid causing simulator sickness. As soon as networks become part of the Motion-To-Photon (MTP) path between rendering and display, there is a risk for extraordinary delays that may impair Quality of Experience (QoE). This short paper provides an overview of latency measurements and models that are applicable to the MTP path, complemented by demands on user and network levels. It specifically reports on freeze duration measurements using a commercial TPCAST wireless VR solution, and identifies a corresponding stochastic model of the freeze length distribution, which may serve as disturbance model for VR QoE studies. © 2019 IEEE.

  • 32.
    Garcia-Loro, F.
    et al.
    Spanish University for Distance Education (UNED), ESP.
    Cristobal, E. S.
    Spanish University for Distance Education (UNED), ESP.
    Diaz, G.
    Spanish University for Distance Education (UNED), ESP.
    MacHo, A.
    Spanish University for Distance Education (UNED), ESP.
    Baizan, P.
    Spanish University for Distance Education (UNED), ESP.
    Blazquez, M.
    Spanish University for Distance Education (UNED), ESP.
    Castro, M.
    Spanish University for Distance Education (UNED), ESP.
    Plaza, P.
    Spanish University for Distance Education (UNED), ESP.
    Orduna, P.
    DeustoTech LabsLand, ESP.
    Auer, M.
    International Association of Online Engineering (IAOE), AUT.
    Kulesza, Wlodek
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Gustavsson, Ingvar
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Nilsson, Kristian
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Fidalgo, A.
    School of Engineering of Polytechnic of Porto (ISEP), PRT.
    Alves, G.
    School of Engineering of Polytechnic of Porto (ISEP), PRT.
    Marques, A.
    School of Engineering of Polytechnic of Porto (ISEP), PRT.
    Hernandez-Jayo, U.
    University of Deusto, Bibao, ESP.
    Garcia-Zubia, J.
    University of Deusto, Bibao, ESP.
    Kreiter, C.
    Carinthia University of Applied Sciences (CUAS), AUT.
    Pester, A.
    Carinthia University of Applied Sciences (CUAS), AUT.
    Garcia-Hernandez, C.
    EVM, Tenerife, ESP.
    Tavio, R.
    EVM, Tenerife, ESP.
    Valtonen, K.
    OMNIA, FIN.
    Lehtikangas, E.
    OMNIA, FIN.
    PILAR: A Federation of VISIR Remote Laboratory Systems for Educational Open Activities2018In: Proceedings of 2018 IEEE International Conference on Teaching, Assessment, and Learning for Engineering, TALE 2018, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 134-141Conference paper (Refereed)
    Abstract [en]

    Social demands have promoted an educational approach based on an 'anywhere and anytime' premise. Remote laboratories have emerged as the answer to the demands of technical educational areas for adapting themselves to this scenario. The result has not only benefit distance learning students but has provided new learning scenarios both for teachers and students as well as allowing a flexible approach to experimental topics. However, as any other solution for providing practical scenarios (hands-on labs, virtual labs or simulators), remote labs face several constraints inherited from the subsystems of its deployment - hardware (real instruments, equipment and scenario) and software (analog/digital conversions, communications, workbenches, etc.}. This paper describes the Erasmus+ project Platform Integration of Laboratories based on the Architecture of visiR (PILAR) which deals with several units of the federation installed in different educational institutions and devoted to analog electronics and electrical circuits. Based on the limitations of remote labs, the need for the federation will be justified and its benefits will be described by taking advantage of its strengths. The challenges that have come up during the different stages and the different approaches to design are also going to be described and analyzed. © 2018 IEEE.

  • 33.
    Gaszczyk, Dariusz
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Wearable Assistant For Monitoring Solitary People2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Master Thesis presents the system consisting of software and components of Arduinoplatform along with modules compatible with it, intended for use indoor. The device fulfils thefollowing requirements which are: to ensure privacy preservation, low energy consumptionand the wireless nature.

    This thesis reports the development of a prototype that would ensure step detection,posture detection, indoor localization, tumble detection and heart rate detection using themicrocontroller, AltIMU-10 v4 module, heart rate monitor, WiFi module and battery. Veryimportant part of the thesis is algorithm, which uses comparison function. Thanks to thewireless nature of a prototype, the system collects data regardless of an environment and sendthem directly to every device supported by Microsoft Windows platform, Linux platform orOS X platform, which are monitored by the supervisor, who takes care of the solitary person.

    The main contributions of the prototype are: indoor localization, identification andclassification of occurring situations and monitoring vital signs of the solitary person.

    To ensure indoor localization the prototype must collect data from accelerometer. Ofcourse data from AltIMU-10 v4 module in basic form are useless for the supervisor, so thealgorithm, using by the prototype, is programmed to processing and filtering it.

    Algorithm is also used to identification and classification occurring situations. Datafrom accelerometer are processed by it and compared with the created pattern.

    Monitoring vital signs of the solitary person are more complicated function, because itrequires not only data from accelerometer, but also from heart rate monitor. This sensor isusing to the analyzing condition of the patient when dangerous situation occurs.

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  • 34.
    Ghanian, Nariman
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Farhang Esfahani, William Mohammad
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Hassan, Muhammad Touqeer Ul
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Electrical energy analysis in nine countries of Europe, with focus on wind power and other renewable energy sources2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis has been written for the Bachelor degree in Electrical Engineering held at Blekinge Tekniska Högskola Karlskrona, Sweden. The basis of this thesis is a statistical analysis of the electrical energy situation with emphasis on contribution of wind power and other renewable energy in electricity production in the European area and key countries.

     

    The main parameters, which considered in this thesis are electricity production and consumption, installed capacity trends and also the operation of renewable sources, especially wind power in gross electricity generation. Meanwhile, the whole date and materials are based on real values and investigated from the latest publications of governments and energy agencies of European union and key countries.

     

    The target of European renewable energy is that the member countries must achieve at least 20 percent of final energy consumption from renewable energy by 2020. Germany, United Kingdom, Spain and France and Portugal are members of the highest consumers of electricity in the Europe and still the main source of electrical production in these countries are fossil fuels, the main challenge is that they should start to shutting down the traditional power plant and improve the infrastructure for installing the renewable electrical capacity instead.

     

    According to the statistics, many of the European countries such as United Kingdom, Germany, Spain, Denmark and Sweden have started up to use the renewable energy to produce the electrical energy, but their governments have special keen eye for investment in the wind energy sector. Wind power grew sharply during the past decades in Europe and becoming vital every coming day in comparison to other renewable energy, since the low cost of electricity can be granted through a small investment and relies on the wind blowing compared to the conventional electricity generation sources. The diagrams demonstrate the wind power has a main portion to producing the electrical energy and every year a considerable amount of installed capacity is added to the total electrical grid.

     

    In addition, the expansion of renewable energy  to achieve the high percent of electrical production requires  the improvement of  infrastructure such as ecological research and high coordination between different organizations. Also, the electrical generation cannot be constant, and in winter the overall consumption and demand for electricity increases all over Europe. The exploitation of some renewable sources such as solar and wind power for electrical production can have fluctuation due to the weather condition and wind speed, which can affect the overall generation to the electrical grid.

     

    Therefore, the balancing of several renewable sources in different seasons,  needs the unique power management for reliable electrical production. In this trend, Norway is a successful country in Europe that uses over 90 percent of  renewable sources for total electrical generation. The thesis has covered these challenges and how they are overcoming these issues.

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  • 35.
    Gholamhosseinpour, Ali
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Millimeter Wave Radar Interfacing with Android Smartphone2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Radar system development is generally costly, complicated and time consuming. This has kept its presence mostly inside industries and research centers with the necessary equipment to produce and operate such a system. Until recent years, realization of a fully integrated radar system on a chip was not feasible, however this is no longer the case and there are several types of sensors available from different manufacturers.

    Radar sensors offer some advantages that are unmatched by other sensing and imaging technologies such as operation in fog, dust and over long distances. This makes them suitable for use in Navigation, Automation, Robotics, and Security systems applications. The purpose of this thesis is to demonstrate the feasibility of a simplified radar system’s user interface via integration with the most common portable computer, a Smartphone, to make it possible for users with minimal knowledge of radar systems design and operation to use it in different applications.

    Smartphones are very powerful portable computers equipped with a suite of sensors with the potential to be used in a wide variety of applications. It seems logical to take advantage of their computing power and portability. The combination of a radar sensor and a smartphone can act as a demonstrator in an effort to bring radar sensors one step closer to the hands of the developers and consumers.

    In this study the following areas are explored and proper solutions are implemented;

    • Design of a control board with capability to drive a radar sensor, capture the signal and transfer it to a secondary device (PC or Smartphone) both wired and wirelessly e.g. Bluetooth.
    • A firmware that is capable of driving the control board and can receive, interpret and execute messages from a PC and or a Smartphone
    • A cross compatible master software that can run on Linux, Windows, Mac and Android OSs and is capable of communication with the firmware/control board
    • Proper analysis methods for signal capture and process purposes
    • Automation of some parameter adjustment for different modes of operation of the Radar System in order to make the user interface as simple as possible
    • A user friendly user-interface and API that can run on both PC and Smartphone 
  • 36.
    Gholami, Omid
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Sotskov, Yuri
    United Institute Of Informatics Problems, BLR.
    Werner, Frank
    Otto-von-Guericke-Universität, DEU.
    A Genetic algorithms for hybrid job-shop problems with minimizing the makespan and mean flow time2018In: Journal of Advanced Manufacturing Systems, ISSN 0219-6867, E-ISSN 1793-6896, Vol. 17, no 4, p. 461-486Article in journal (Refereed)
    Abstract [en]

    We address a generalization of the classical job-shop problem which is called a hybrid job-shop problem. The criteria under consideration are the minimization of the makespan and mean ow time. In the hybrid job-shop, machines of type k are available for processing the specific subset O^k of the given operations. Each set O^k maybe partitioned into subsets for their processing on the machines of type k. Solving the hybrid job-shopproblem implies the solution of two subproblems: an assignment of all operations fromthe set O^k to the machines of type k and nding optimal sequences of the operationsfor their processing on each machine. In this paper, a genetic algorithm is developedto solve these two subproblems simultaneously. For solving the subproblems, a specialchromosome is used in the genetic algorithm based on a mixed graph model. We com-pare our genetic algorithms with a branch and bound algorithms and three other recentheuristic algorithms from the literature. Computational results for benchmark instanceswith 10 jobs and up to 50 machines show that the proposed genetic algorithm is ratherecient for both criteria. Compared with the other heuristics, the new algorithm givesmost often an optimal solution and the average percentage deviation from the optimalfunction value is about 4 %.

  • 37.
    Girajala, Manikanta Satish Kumar
    et al.
    Blekinge Institute of Technology.
    Vatsavayi, Sri Satyasai
    Blekinge Institute of Technology.
    Medavarapu, Veera Bhadra Prathith Kumar
    Blekinge Institute of Technology.
    Home Irrigation System: Using Internet Control2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this report an illustration of a Home Irrigation System Using Internet Control by Arduino is proposed. This automated system for irrigation identifies the moisture content present in soil and automatically toggles the switching off pump when the power is supplied. An appropriate usage of irrigation system is necessary and it is essential to maintain suitable water content and avoid shortage of water due to lack of rain and spontaneous use of water, to avoid wastage of water. Due to this reason, this home irrigation system can be used to monitor soil moisture. Which is very useful in all climatic conditions. This project aims at reducing excessive and uncontrolled water usage as well as maintaining moisture content of the soil to get healthy irrigation. Home Irrigation System can be used for saving time using monitoring device thus minimizing human effort. Overall, the project achieved its primary goal to avoid the wastage of water while maintaining the moisture content of the soil with less delay in the processing time.

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  • 38.
    GOGINENI, SRI LOHITH
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    DEVELOPMENT OF AN ROI AWARE FULL-REFERENCE OBJECTIVE PERCEPTUAL QUALITY METRIC ON IMAGES OVER FADING CHANNEL2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In spite of technological advances in wireless systems, transmitted data suffers from impairments through both lossy source coding and transmission overerror prone channels. Due to these errors, the quality of multimedia content is degraded. The major challenge for service providers in this scenario is to measure the perceptual impact of distortions to provide certain Quality of Experience(QoE) to the end user. The general tendency of the Human Visual System (HVS) suggests that the artifacts in the Region-of-Interest (ROI) are perceived to be more annoying compared to the artifacts in Background (BG). With this assumption, the thesis aims to measure the quality of image over ROI and BG independently. Visual Information Fidelity (VIF), a full-reference image quality assessment is chosen for this purpose. Finally, the metric measured over ROI and BG are pooled to get a ROI aware metric. The ROI aware metric is used to predict the Mean Opinion Score (MOS) of an image. In this study, an ROI aware quality metric is used to measure the quality of a set of distorted images generated using a wireless channel. Eventually, MOS of the distorted images is estimated. Lastly, the predicted MOS is validated with the MOS obtained from subjective tests. Testing the proposed image quality assessment approach shows an improved prediction performance of ROI aware quality metric over traditional image quality metrics. It is also observed that the above approach provides a consistent improvement over a wide variety of distortions. After extensive research, the obtained results suggest that the impairments in the ROI are perceived to be more annoying than that of the BG.

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  • 39.
    Gradolewski, Dawid
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences. Bioseco Sp. z. o. o., POL.
    Dziak, Damian
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences. Bioseco Sp. z. o. o., POL.
    Martynow, Milosz
    Bioseco Sp. z. o. o., POL.
    Kaniecki, Damian
    Bioseco Sp. z. o. o., POL.
    Szurlej-Kielanska, Aleksandra
    University of Gdansk, POL.
    Jaworski, Adam
    Bioseco Sp. z. o. o., POL.
    Kulesza, Wlodek
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Comprehensive bird preservation at wind farms2021In: Sensors, E-ISSN 1424-8220, Vol. 21, no 1, p. 1-35, article id 267Article in journal (Refereed)
    Abstract [en]

    Wind as a clean and renewable energy source has been used by humans for centuries. However, in recent years with the increase in the number and size of wind turbines, their impact on avifauna has become worrisome. Researchers estimated that in the U.S. up to 500,000 birds die annually due to collisions with wind turbines. This article proposes a system for mitigating bird mortality around wind farms. The solution is based on a stereo-vision system embedded in distributed computing and IoT paradigms. After a bird’s detection in a defined zone, the decision-making system activates a collision avoidance routine composed of light and sound deterrents and the turbine stopping procedure. The development process applies a User-Driven Design approach along with the process of component selection and heuristic adjustment. This proposal includes a bird detection method and localization procedure. The bird identification is carried out using artificial intelligence algorithms. Validation tests with a fixed-wing drone and verifying observations by ornithologists proved the system’s desired reliability of detecting a bird with wingspan over 1.5 m from at least 300 m. Moreover, the suitability of the system to classify the size of the detected bird into one of three wingspan categories, small, medium and large, was confirmed. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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    fulltext
  • 40.
    Gustavsson, Ingvar
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Nilsson, Kristian
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Zackrisson, Johan
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Alves, G.R.
    Fidalgo, A.V.
    Claesson, L.
    Zubia, J.G.
    Jayo, U.H.
    Castro, M.
    Diaz Orueta, G.
    Loro, F.G.
    Lab sessions in VISIR laboratories2016In: Proceedings of 2016 13th International Conference on Remote Engineering and Virtual Instrumentation, REV 2016, IEEE Press, 2016, p. 350-352Conference paper (Refereed)
    Abstract [en]

    Experimental activities with real components are an essential part of all courses including or devoted to electrical and electronic circuits theory and practice. The knowledge triangle composed of hand-written exercises, simulations and traditional lab experiments has been enriched with the possibility for students to conduct real experiments over the Internet, using remote labs. This tutorial is devoted to one such remote lab named Virtual Instrument Systems in Reality (VISIR). The Global Online Laboratory Consortium (GOLC) elected VISIR as the best remote controlled laboratory in the world, at the first time this distinction was awarded. At the end of this tutorial, attendees are expected to know what is VISIR, what can (not) be done with it, who is currently using it, and how can one integrate it in a given course curriculum.

  • 41. Hellisten, Hans
    et al.
    Machado, Renato
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Pettersson, Mats I.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Vu, Viet Thuy
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Dammert, Patrik
    EXPERIMENTAL RESULTS ON CHANGE DETECTION BASED ON BAYES PROBABILITY THEOREM2015In: 2015 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS), IEEE Communications Society, 2015, p. 318-321Conference paper (Refereed)
    Abstract [en]

    In this paper we propose a new change detection (CD) algorithm based on the Bayes theorem and probability assignments. Differently from any kind of likelihood ratio test (LRT) algorithms, the proposed algorithm does not present target alarms, but the probability of certain image position is a target position. In other words, the proposed method leads to quantitative estimates on the probability of a target at any pixel, whereas LRT algorithms can only be used as a figure of merit for any pixel to contain a target.

  • 42.
    Horvat, Marko
    et al.
    University of Zagreb, SRB.
    Dobrinic, Marko
    University of Zagreb, SRB.
    Novosel, Matej
    University of Zagreb, SRB.
    Jerčić, Petar
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Assessing emotional responses induced in virtual reality using a consumer EEG headset: A preliminary report2018In: 2018 41st International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2018 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 1006-1010Conference paper (Refereed)
    Abstract [en]

    We report on a pilot study involving emotion elicitation in virtual reality (VR) and assessment of emotional responses with a consumer-grade EEG device. The stimulation used HTC Vive VR system showing pictures from NAPS database within a specifically designed virtual environment. The stimulation consisted of two distinct sequences with 10 pictures of happiness and 10 pictures of fear. Each picture was contained in a separate virtual room that the participants traveled through along a preset path. The estimation employed EMOTIV EPOC+ 14-channel EEG headset and a custom-developed application. The software wirelessly received EEG signals from alpha, beta low, beta high, gamma and theta bands, time-stamped them and dynamically stored in a relational database for subsequent analysis. Our preliminary results show that statistically significant correlations between valence and arousal ratings of pictures and EEG bands are present but highly personalized. Simultaneous correct placement of VR and EEG headsets is demanding and precise localization of electrodes is difficult. In fact, if emotion estimation is not strictly necessary we recommend using devices with fewer electrodes. Nevertheless, we found the EEG to be effective. By acknowledging its limitations, and using the headset in the correct context, experiments involving emotions may be significantly amended. © 2018 Croatian Society MIPRO.

  • 43.
    Hu, Yan
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Cloud Computing for Achieving Interoperability in Home-based Healthcare2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The care of chronic disease has become the main challenge for healthcare institutions around the world. As the incidence and prevalence of chronic diseases continue to increase, it is a big challenge for traditional hospital-based healthcare to meet requirements of patients. To meet the growing needs of patients, moving the front desk of healthcare from hospital to home is essential. Home-based healthcare for chronic disease involves many different organizations and healthcare providers. Therefore, there are interoperability problems for cooperation among the various organizations and healthcare providers to provide efficient and seamless home-based healthcare. 

    This thesis aims to point out an appropriate technical solution to interoperability problems in home-based healthcare. There are different levels of interoperability, such as pragmatic, semantic and syntactic. We explored alternative solutions specifically for syntactic interoperability. We started to identify the interoperability problems among different healthcare centers by interviews and online surveys. Based on this empirical study, we mainly used two current techniques, namely peer-to-peer (P2P) networks and cloud computing, to design prototypes for sharing healthcare data. Comparing these two techniques, we found the cloud-based solution figured out most of the problems encountered in healthcare interoperability. 

    To identify state of the art, and pinpoint the challenges and possible future directions for applying a cloud-based solution, a systematic literature review was carried out on cloud-based healthcare solutions. Based on the literature reviewed, we suggest a hybrid cloud model, with access controls and techniques for securing data, could be an acceptable solution for home-based healthcare in the future. This cloud model would work as a community for both healthcare providers and recipients, as well as other stakeholders, such as family members and other patients with similar symptoms. Then we conducted a questionnaire study with healthcare recipients and interviewed healthcare providers to gather the requirements for the design of the community. Based on the concept of ‘community’ from the activity theory model, we designed a prototype to demonstrate our proposed solution.   

    Finally, we proposed the conceptual hybrid cloud model. In our hybrid cloud model, hospitals and primary healthcare centers could continue using their own databases as private clouds. For home-based healthcare data, we argued, the best approach is to store and process the data in public clouds. Healthcare recipients, as the owners of their health data in public clouds, should then decide who can access their data and the conditions for sharing. To evaluate this model, we conducted a two-step case study of diabetes healthcare in Blekinge, Sweden. We found that our improved hybrid cloud model will be feasible in the future for home-based healthcare, and it will benefit both healthcare providers and recipients.

    To apply this model in practice, we suggest that a professional IT healthcare education team should be created to support both healthcare providers and recipients.

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  • 44.
    Hu, Yan
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Cloud Computing for Interoperability in Home-Based Healthcare2014Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The care of chronic disease has become a main challenge for healthcare institutions around the world. As the incidence and prevalence of chronic diseases continue to increase, traditional hospital-based healthcare is less able to meet the needs of every patient. Treating chronic disease heavily depends on the patient’s daily behaviors, so patient-centered healthcare is encouraged. To improve patients’ quality of life, moving the base of healthcare from hospital to home is imperative. Home-based chronic disease care involves many different healthcare organizations and healthcare providers. Therefore, interoperability is a key approach to provide efficient and convenient home-based healthcare services. This thesis aims to reveal the interoperability issues in the current healthcare system and to point out an appropriate technical solution to overcome them. We start with collecting perspectives from both healthcare providers and healthcare recipients through interviews and online surveys to understand the situations and problems they face. In our research study, we mainly use two current techniques―peer-to-peer (P2P) networks and cloud computing―to design prototypes for sharing healthcare data, developing both a P2P-based solution and a cloud-based solution. Comparing these two techniques, we found the cloud-based solution covered most of the deficiencies in healthcare interoperability. Although there are different types of interoperability, such as pragmatic, semantic and syntactic, we explored alternative solutions specifically for syntactic interoperability. To identify the state of the art and pinpoint the challenges and possible future directions for applying a cloud-based solution, we reviewed the literature on cloud-based eHealth solutions. We suggest that a hybrid cloud model, which contains access controls and techniques for securing data, would be a feasible solution for developing a citizen-centered, home-based healthcare system. Patients’ healthcare records in hospitals and other healthcare centers could be kept in private clouds, while patients’ daily self-management data could be published in a trusted public cloud. Patients, as the owners of their health data, should then decide who can access their data and the conditions for sharing. Finally, we propose an online virtual community for home-based chronic disease healthcare―a cloud-based, home healthcare platform. The requirements of the platform were mainly determined from the responses to an online questionnaire delivered to a target group of people. This platform integrates healthcare providers and recipients within the same platform. Through this shared platform, interoperability among different healthcare providers, as well as with healthcare recipients’ self-management regimens, could be achieved.

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  • 45.
    Hu, Yan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Peng, Cong
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Bai, Guohua
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Sharing Health Data Through Hybrid Cloud For Self-Management2015In: 2015 IEEE International Conference on Multimedia & Expo Workshops (ICMEW), IEEE, 2015Conference paper (Refereed)
    Abstract [en]

    Nowadays, patient self-management is encouraged in home-based healthcare, especially for chronic disease care. Sharing health information could improve the quality of patient self-management. In this paper, we introduce cloud computing as a potential technology to provide a more sustainable long-term solution compared with other technologies. A hybrid cloud is identified as a suitable way to enable patients to share health information for promoting the treatment of chronic diseases. And then a prototype on the case of type 2 diabetes is implemented to prove the feasibility of the proposed solution.

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  • 46.
    Ickin, Selim
    et al.
    Blekinge Institute of Technology.
    Fiedler, Markus
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Quality of Experience on Smartphones: Network, Application, and Energy Perspectives2016Conference paper (Refereed)
    Abstract [en]

    For service and mobile operators, it is importantto monitor and keep high user engagement levels. Qualityof Experience (QoE) on video streaming applications is animportant engagement measure for video consumer customers.In this paper, video QoE (with the focus on stalling events)is studied from network, application, and energy perspectiveswith various instrumentations on a smartphone. This enablesthe understanding of inter-relation between the perspectives andalso how they influence the video QoE. Results show that packetdelay variation and the maximal burst size in the network level;inter-picture time (picture delay) in the application layer; andalso fluctuations in the energy consumptions are strong indicatorsfor QoE. We show, via extensive QoE and energy measurementson smartphones that, based on the choice of streaming protocol,energy consumption can be reduced or increased in the case ofstalling events during a video stream.

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  • 47.
    Jadim, Ramsey
    et al.
    Linnaeus University, SWE.
    Kans, Mirka
    Linnaeus University, SWE.
    Schulte, Jesko
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Alhattab, Mohammed
    Ministry of Electricity and Water, KWT.
    May, Alhendi
    Ministry of Electricity and Water, KWT.
    Ali, Bushehry
    Ministry of Electricity and Water, KWT.
    On Approaching Relevant Cost-Effective SustainableMaintenance of Mineral Oil-Filled Electrical Transformers2021In: Energies, E-ISSN 1996-1073, Vol. 14, no 12, article id 3670Article in journal (Refereed)
    Abstract [en]

    Fire and explosion accidents of oil-filled electrical transformers are leading to negativeimpacts, not only on the delivery of energy, but also on workplace health and safety as well asthe surrounding environment. Such accidents are still being reported, regardless of applying theregular maintenance strategy in the power plants. The purpose of this paper is to integrate asustainability perspective into the maintenance strategy. The problem addressed is: how can weapproach the relevant cost-effective sustainable maintenance for oil-filled electrical transformers?For this purpose, an empirical study in a power plant in Kuwait was introduced. The first stagewas to carry out a sustainability assessment using the ABCD procedure. In this procedure, gaps toapproach sustainability were identified and actions prioritized to close these gaps were demonstrated.Applying this procedure yielded an early fault diagnosis (EFD) model for achieving cost-effectivesustainable maintenance using a fault trend chart based on a novel numerical method. Implementingthis model resulted in an extension of the lifetime of transformers with suspected failure propagation,leading to a deferral of the replacement investment costs. The principal conclusion of this paper isthe importance of viewing the maintenance strategy of transformers from a strategic sustainabilityperspective, in order to approach relevant cost-effective sustainable maintenance.

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    2021 Jadim, Kans, Schulte et al. On Approaching Relevant Cost-Effective Sustainable Maintenance
  • 48.
    Jamil, Momin
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Zepernick, Hans-Juergen
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Yang, Xinshe
    Middlesex University, GBR.
    Sequence optimization for integrated radar and communication systems using meta-heuristic multiobjective methods2017In: 2017 IEEE Radar Conference, RadarConf 2017, Institute of Electrical and Electronics Engineers Inc. , 2017, p. 0502-0507Conference paper (Refereed)
    Abstract [en]

    In real-world engineering problems, several conflicting objective functions have often to be optimized simultaneously. Typically, the objective functions of these problems are too complex to solve using derivative-based optimization methods. Integration of navigation and radar functionality with communication applications is such a problem. Designing sequences for these systems is a difficult task. This task is further complicated by the following factors: (i) conflicting requirements on autocorrelation and crosscorrelation characteristics; (ii) the associated cost functions might be irregular and may have several local minima. Traditional or gradient based optimization methods may face challenges or are unsuitable to solve such a complex problem. In this paper, we pose simultaneous optimization of autocorrelation and crosscorrelation characteristics of Oppermann sequences as a multiobjective problem. We compare the performance of prominent state-of-the-art multiobjective evolutionary meta-heuristic algorithms to design Oppermann sequences for integrated radar and communication systems. © 2017 IEEE.

  • 49.
    Jiang, Yuning
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Atif, Yacine
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Ding, Jianguo
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Cyber-Physical Systems Security Based on A Cross-Linked and Correlated Vulnerability Database2019In: Critical Information Infrastructures Security: 14th International Conference, CRITIS 2019, Linköping, Sweden, September 23–25, 2019, Revised Selected Papers / [ed] Simin Nadjm-Tehrani, Springer , 2019, p. 71-82Conference paper (Refereed)
    Abstract [en]

    Recent advances in data analytics prompt dynamic datadriven vulnerability assessments whereby data contained from vulnerabilityalert repositories as well as from Cyber-physical System (CPS) layer networks and standardised enumerations. Yet, current vulnerability assessment processes are mostly conducted manually. However, the huge volume of scanned data requires substantial information processing and analytical reasoning, which could not be satisfied considering the imprecision of manual vulnerability analysis. In this paper, we propose to employ a cross-linked and correlated database to collect, extract, filter and visualise vulnerability data across multiple existing repositories, whereby CPS vulnerability information is inferred. Based on our locally-updated database, we provide an in-depth case study on gathered CPS vulnerability data, to explore the trends of CPS vulnerability. In doing so, we aim to support a higher level of automation in vulnerability awareness and back risk-analysis exercises in critical infrastructures (CIs) protection.

  • 50.
    Jiang, Yuning
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Atif, Yacine
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Ding, Jianguo
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Multi-Level Vulnerability Modeling of Cyber-Physical Systems2018Conference paper (Refereed)
    Abstract [en]

    Vulnerability is defined as ”weakness of an asset or control that can be exploited by a threat” according to ISO/IEC 27000:2009, and it is a vital cyber-security issue to protect cyber-physical systems (CPSs) employed in a range of critical infrastructures (CIs). However, how to quantify both individual and system vulnerability are still not clear. In our proposed poster, we suggest a new procedure to evaluate CPS vulnerability. We reveal a vulnerability-tree model to support the evaluation of CPS-wide vulnerability index, driven by a hierarchy of vulnerability-scenarios resulting synchronously or propagated by tandem vulnerabilities throughout CPS architecture, and that could be exploited by threat agents. Multiple vulnerabilities are linked by boolean operations at each level of the tree. Lower-level vulnerabilities in the tree structure can be exploited by threat agents in order to reach parent vulnerabilities with increasing CPS criticality impacts. At the asset-level, we suggest a novel fuzzy-logic based valuation of vulnerability along standard metrics. Both the procedure and fuzzy-based approach are discussed and illustrated through SCADA-based smart power-grid system as a case study in the poster, with our goal to streamline the process of vulnerability computation at both asset and CPS levels.

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