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  • 13201.
    Ramos, Lucas P.
    et al.
    Aeronautics Institute of Technology, BRA.
    Schwartz, Christofer
    Aeronautics Institute of Technology, BRA.
    Alves, Dimas Irion
    Federal University of Pampa, BRA.
    Duarte, Leonardo Tomazeli
    University of Campinas, BRA.
    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
    Aeronautics Institute of Technology, BRA.
    Change detection in UWB VHF SAR images exploiting flight heading diversity through robust principal component analysis2020In: Proceedings of SPIE - The International Society for Optical Engineering, SPIE , 2020, Vol. 11533, article id 115330GConference paper (Refereed)
    Abstract [en]

    Change detection methods are frequently associated with wavelength-resolution synthetic aperture radar (SAR) images for foliage-penetrating (FOPEN) applications (e.g., the detection of concealed targets in forestry areas), being a research topic of interest over the last decades. The challenge associated with the design of automated change detection techniques goes beyond performing the target detection. It is also related to clutter suppression aiming at a low false alarm rate (FAR). The problem of detecting targets and removing content in SAR data can be treated as an unsupervised signal separation problem, usually referred to as blind source separation (BSS). Additionally, low frequency wavelength-resolution SAR images can be considered to follow an additive separation model due to their backscatter characteristics. In this context, it is possible to explore robust principal component analysis (RPCA) as a source-separation method for problems in which the mixing model is additive and two-dimensional, as the interest SAR images. This paper presents a change detection method for wavelengthresolution SAR images based on the RPCA via principal component pursuit (PCP), considering the use of small image stacks to explore the data diversity from measurements of different flight headings. The proposed method is evaluated using real data obtained from measurements of the ultrawideband (UWB) very high frequency (VHF) SAR system CARABAS II. The experimental results show that the proposed method can achieve a high probability of detection (PD) values for a low FAR (i.e., PD of 0.98 for a FAR of 0.41 objects per square kilometer). Finally, discussions regarding the use of the RPCA in change detection methods and the diversity gains are provided in the paper. © SPIE. Downloading of the abstract is permitted for personal use only.

  • 13202.
    Ramsberg, Elias
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Edlund, Erik
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Hjärnstimulans för lärande i VR - en inblick i framtiden för lärande i VR2023Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    By analyzing past attempts at streamlined digital teaching and learning, and the problems therewith, we speculate as to the future of this field and the path of its development. We simulate the experience of studying and learning in a real classroom, under real circumstances, virtually. Participants have been given the opportunity to, with the help of a VR-headset and the application developed for the purpose of this research, look at two separate videos. The application allows you to watch and listen to a lesson or a video in a room simulating a real classroom, and it combines the digital functionality of recording, pausing and jumping in the timeline of the content, while simultaneously being offered the physical medium of doodling. Results show that participants have had a better recollection of the content during which they were doodling than that during which they were not, regardless of the content of the doodling or what it depicts.

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    Hjärnstimulans för lärande i VR - en inblick i framtiden för lärande i VR
  • 13203. Ramstedt, Linda
    Analysing the effects of governmental control policies in transport chains using micro-level simulation2005Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Increasing freight transportation volumes continue to increase problems related to human health, congestion on the transport infrastructure, noise, climate changes, etc. Governments often want to minimize these negative effects, and this wish is expressed in societal goals, e.g., to reach environmental targets. An important instrument for reaching societal goals is governmental control policies, e.g., regulations, taxes and fees, which can influence the behaviour of the actors in a transport chain. Before implementing such control policies, it is crucial to predict their effects in order to make probable that it is a good measure. A review of models that consider the effects of governmental control policies on transportation has been performed which shows that macro-level models are mainly used for this purpose. However, the behaviour of the individual transport chain actors can hardly be captured in such models since the decision making actors are not modelled explicitly. Consequently, the negative effects caused by the decisions taken by the individual transport chain actors are not fully captured in these models. We believe that micro-level models have the potential to bridge the gap between governmental policy-making and the behaviour of transport chain actors. A micro-level model based on agent-technology has been developed which captures the environmental, quality and economical performance in transport chains, given different governmental control policies. The transport chain actors are represented by decision-making agents in the model. Logistical factors for characterizing transport chains have been identified and described according to degree of influence. To illustrate the usage of the micro-level model, simulation experiments based on a real world case have been performed where different levels of governmental control policies are introduced. The simulation results so far have showed that the model seems to simulate the behaviour of the transport chain actors correctly in the studied scenarios. The simulation tool can then be used as a decision support for policy-makers and serve as a complement to existing tools based on macro-level models.

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  • 13204.
    Ramstedt, Linda
    Blekinge Institute of Technology, School of Engineering, Department of Systems and Software Engineering.
    Transport policy analysis using multi-agent-based simulation2008Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis explores how multi-agent-based simulation can be used for transport policy analysis. Transport policies are often used as a means to reach governmental goals, such as environmental targets to reduce the impact of transportation. To predict how transportation is influenced by policies, public authorities often make use of simulation models. A structured review of such models is made focussing on important transport chain characteristics. We argue that to properly predict the actual environmental, economic, and logistical effects of transport policies, the logistical decisions made in transport chains must be modelled appropriately. Such decisions, e.g., concern the choice of producer and traffic mode, planning of transportation, production, and terminal handling. The review concludes that models currently used for transport policy analysis fail to capture many of these characteristics. We argue that agent-based models have the potential to include these aspects since they are able to explicitly model the actual decision making in transport chains. We have identified a set of generic roles in transport chains where each role is responsible for certain decisions. A multi-agent-based simulator, TAPAS, has been developed in which these roles are modelled as agents. Thus, the decision making in transport chains and its influence by the application of transport policies are captured. The decisions lead to the execution of the logistical operations which in turn have consequences on the logistics, economic, and environmental performance. The usage of TAPAS is illustrated by presenting two scenarios based on realworld transport chains. Simulation experiments of the scenarios have been performed where different types of transport policies are introduced. The simulation results are analysed, e.g., by comparing the results to similar studies and by sensitivity analysis of input parameters. To facilitate the validation and generalisation of simulation results we suggest making use of typical transport chains and roles characterised by, e.g., product type and geographical locations. The type of studies that TAPAS can support are described and compared to studies typically made with traditional models. Transport policies which are relevant to examine are described and their potential influence on transport chains are analysed. The possible usage of TAPAS is discussed and related to different types of users. Public authorities can, e.g., use TAPAS to complement studies using traditional models. This can improve the accuracy of the simulation results by the inclusion of more logistical aspects. Large companies are another type of user which, e.g., can use TAPAS to analyse new market segments, such as new product types or new consumers, where historical data is not available.

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  • 13205. Ramstedt, Linda
    et al.
    Davidsson, Paul
    Holmgren, Johan
    Persson, Jan A.
    On the Use of Micro-level Simulation for Estimation of the Effects of Governmental Control Policies2007Conference paper (Refereed)
  • 13206. Ramstedt, Linda
    et al.
    Davidsson, Paul
    Persson, Jan A.
    Using a Micro-Level Model for Governmental Policy-Making2004Conference paper (Refereed)
    Abstract [en]

    This project investigates how the actors in a transportation chain are expected to act when different types of governmental control policies are applied. A simulation-based tool is being developed for use in analyzing the effects of different control policies. The simulator is based on agent technology and include some intelligence with respect to how the transport operators act in different situations. The simulator will be used for analyzing the total costs and environmental effects and in this way provide guidance in decision making regarding control policies. Also, cost-effective strategies for companies can be determined with the simulator.

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  • 13207. Ramstedt, Linda
    et al.
    Forss, Michael
    Gustafsson, Inger
    Micro-level Effects of a Kilometre Taxation – Modelling haulier categories2007Conference paper (Refereed)
  • 13208.
    Ramstedt, Linda
    et al.
    Sweco AB, SWE.
    Törnquist Krasemann, Johanna
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Davidsson, Paul
    Malmö Högskola, SWE.
    Movement of people and goods2013In: Understanding Complex Systems / [ed] Edmonds B., Meyer R. (eds), Springer Verlag , 2013, no 9783319669472, p. 705-720Chapter in book (Refereed)
    Abstract [en]

    Due to the continuous growth of traffic and transportation and thus an increased urgency to analyze resource usage and system behavior, the use of computer simulation within this area has become more frequent and acceptable. This chapter presents an overview of modeling and simulation of traffic and transport systems and focuses in particular on the imitation of social behavior and individual decision-making in these systems. We distinguish between transport and traffic. Transport is an activity where goods or people are moved between points A and B, while traffic is referred to as the collection of several transports in a common network such as a road network. We investigate to what extent and how the social characteristics of the users of these different traffic and transport systems are reflected in the simulation models and software. Moreover, we highlight some trends and current issues within this field and provide further reading advice. © 2017, Springer International Publishing AG.

  • 13209. Ramstedt, Linda
    et al.
    Woxenius, Johan
    Modelling approaches to operational decision-making in freight transport chains2006Conference paper (Refereed)
    Abstract [en]

    The decisions taken by logistics services buyers, e.g., definition of consignment size, arrival time at the consignee and type of logistics service provider, are obviously the basis for the economic, quality and environmental performance of freight transport chains. These outcomes of freight transport chains are important to predict and simulation is claimed to be appropriate for evaluating the outcome of different strategies or control policies. Decision- making strategies which are used in practice are also included in simulation models and the effects of different strategies can consequently be evaluated. Therefore, this article reviews simulation and modelling approaches relevant for capturing the effects of decision- making of transport chain actors. The decision-making in transport chains is complex and difficult to generalise as well as capture with simulation. To give a structured overview of the decision-making, the context and the prerequisites, i.e., the conditions for when certain types of decisions are possible to make, the actors in transport chains and their relationships are elaborated on. The result of the study is a structured overview of the operational decision-making of actors, how it is modelled in the literature and which modelling characteristics that seems important to consider.

  • 13210. Ramstedt, Linda
    et al.
    Woxenius, Johan
    Modelling operational decision-making in freight transport chains2006Conference paper (Refereed)
  • 13211.
    Ramström, Victor
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Förstudie och design av simuleringssystem för automatisk kreditgivningsprocess2014Student thesis
    Abstract [en]

    This master thesis has been complied in cooperation with Amfa Bank. The bank has invoice factoring without recourse as their primary service. Since 2006, the bank has an automated credit approval system with the ability to, partially or completely approve credits in during the invoice purchase process, in some cases completely without intervention from any of the credit officers. Due to strict internal regulations of the credit approval system only a minor portion of the invoices that the Bank handles can be processed automatically. The managers of the bank have a high confidence in the credit approval systems ability to make correct credit decisions but few changes have been made since implementation due to uncertainty surrounding the effects of any changes. The aim of this thesis is to perform a feasibility study for simulation of the automated credit approval system and, if found feasible, create a proposal for how to properly implement such a system. The method used in this system includes process descriptions of the banks internal processes that are related to the handling of purchased invoices, an extensive documentation of the processes and functions of the automated credit approval system. The study found that the automated credit approval system could be simulated using a fair amount of developing resources, reusing large parts of the logic from the credit approval system. Complete invoice, credit and ledger data are available for simulation for over 400 000 invoices, providing a solid base for simulation and thereby giving the simulation a high reliability. This report and its appendices can be used by the bank as basis on which to implement a simulation system for its credit approval system. The result from future simulations will provide a comprehensive and clear basis for decisions to optimize the company's automated credit approval system with shorter lead time and cost savings as a result.

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  • 13212.
    Ramya Sravanam, Ramya
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Empirical Study on Quantitative Measurement Methods for Big Image Data: An Experiment using five quantitative methods2016Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context. With the increasing demand for image processing applications in multimedia applications, the importance for research on image quality assessment subject has received great interest. While the goal of Image Quality Assessment is to find the efficient Image Quality Metrics that are closely relative to human visual perception, from the last three decades much effort has been put by the researchers and numerous papers and literature has been developed with emerging Image Quality Assessment techniques. In this regard, emphasis is given to Full-Reference Image Quality Assessment research where analysis of quality measurement algorithms is done based on the referenced original image as that is much closer to perceptual visual quality. Objectives. In this thesis we investigate five mostly used Image Quality Metrics which were selected (which includes Peak Signal to Noise Ratio (PSNR), Structural SIMilarity Index (SSIM), Feature SIMilarity Index (FSIM), Visual Saliency Index (VSI), Universal Quality Index (UQI)) to perform an experiment on a chosen image dataset (of images with different types of distortions due to different image processing applications) and find the most efficient one with respect to the dataset used. This research analysis could possibly be helpful to researchers working on big image data projects where selection of an appropriate Image Quality Metric is of major significance. Our study details the use of dataset taken and the experimental results where the image set highly influences the results.  Methods. The goal of this study is achieved by conducting a Literature Review to investigate the existing Image Quality Assessment research and Image Quality Metrics and by performing an experiment. The image dataset used in the experiment is prepared by obtaining the database from LIVE Image Quality Assessment database. Matlab software engine was used to experiment for image processing applications. Descriptive analysis (includes statistical analysis) was employed to analyze the results obtained from the experiment. Results. For the distortion types involved (JPEG 2000, JPEG compression, White Gaussian Noise, Gaussian Blur) SSIM was efficient to measure the image quality after distortion for JPEG 2000 compressed and white Gaussian noise images and PSNR was efficient for JPEG compression and Gaussian blur images with respect to the original image.  Conclusions. From this study it is evident that SSIM and PSNR are efficient in Image Quality Assessment for the dataset used. Also, that the level of distortions in the image dataset highly influences the results, where in our case SSIM and PSNR perform efficiently for the used database. 

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  • 13213.
    Rana, Abu Noman Sohel
    Blekinge Institute of Technology, School of Management.
    Technological implementation and online banking have increased customer service, satisfaction but reduced costs in the Banking sector of Bangladesh2013Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The study has discussed a broad issue regarding technology driven banking. In addition, it has focused whether technology driven banking have increased customer service, satisfaction and reduced costs. Actually, Bangladesh is a third world developing country, fighting to improve their economy. Banking sector is not completely modern. However, now a day, major banks are trying to adopt technology driven banking services to be more efficient. The study has assessed whether it has influenced to increase customer service and satisfaction in fact, the research aims to evaluate this. The study set four objectives based on the research topic, throughout the study the researcher tried to accomplish the objectives. The research question was also answered at the completion of research. The research has also evaluated the situation of online-based banking in Bangladesh and what customers currently think about it. In literature review, a wide range of literatures have been analyzed on customers' satisfaction in banking sector, technology driven banking in Bangladesh, costs of banking service and so on. Major findings of literature showed that, currently the number of e-banking users is rapidly increasing. Different types of online based banking service have been added very recently (such as; Mobile banking, any branch banking). A large number of respondents said that, they think technology driven banking will be more efficient and effective for the banks and its customers. More than 50% people are satisfied by current online banking service. To achieve the objectives of the research the researcher has designed the research-methodology in a logical way. The whole research process has been show in a diagram. This research is based on primary and secondary findings. For the collection of primary information the researcher has interviewed 150 people and secondary data has been collected from previous journals, Bank's statements, Bangladesh Bank's report, Books and articles. The research is mainly focused a quantitative approach but in some case it has been used qualitative information. Data has been analyzed by using MS excel. In the findings and analysis chapter, the researcher showed the findings clearly and sequentially. It showed that, people are now gradually accepting technology driven banking. Customer service, customers' satisfaction and costs issues have been well asserted. A discussion has been provided with compare and contrast between the findings and what previous literatures said. Finally a set of recommendation has been made. Conclusion showed whether the research has accomplished its objectives and answered research question.

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  • 13214.
    Rana, Bilal Zahid
    et al.
    Blekinge Institute of Technology, School of Computing.
    Ali, Shahid
    Blekinge Institute of Technology, School of Computing.
    OPNET Analysis of VoIP over MPLS VPN with IP QoS2011Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    There are many disadvantages (cost, lack of security, difficult to manage large networks, support to non-sensitive applications, delay, etc.) associated with traditional networking, IP network, ATM and Frame relay networking. To solve this, an MPLS-based VPN networking is introduced that can work with existing deployed backbones and allow organizations to interconnect the dispersed sites and remote workers through secure links by using public internet. In this thesis, we are trying to build a better understanding to MPLS VPN and we researched to analyze the behavior of OSPF and RIPv2 based MPLS-BGP VPN architectures by using intense VoIP traffic. Then it comes with an OPNET simulation process and scenarios for MPLS-BGP VPN. At last, the conclusion is made: OSPF based MPLS-BGP VPN architecture has lower VPN delay, background traffic Flow delay, LSP delay and point-to-point Queuing delay, and has better performance in VPN load and VPN throughput that can acquire customer satisfaction and confidence as compared to the RIPv2 based MPLS-BGP VPN architecture.

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  • 13215.
    Rana, Mohammad Sohel
    Blekinge Institute of Technology, School of Management.
    Product Reward Discounting on Variance of Time2011Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Naturally individuals prefer to receive the rewards after purchasing a certain amount of products or services. Customer rewards program is an effective tool for the company to increase the customer loyalty. Luxury and necessity products can be offered as rewards under the product reward program. The main purpose of this study is to find out how individuals discount luxury rewards over necessity rewards in differences of time length. In this research empirical data has been collected from the students living in student apartments through the survey questionnaire. The respondents were given five time variances such as today, 1 month, 3 months, 6 months and 1 year to present their preferences between luxury and necessity products of equal value. After collecting and analyzing the survey data it was found that majority of the respondents prefers the necessity rewards in shorter period of time whereas in the longer delay they prefer the luxury rewards. Hence individuals discount luxury rewards over the necessity rewards of equal value in the variance of time.

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  • 13216.
    Ranga, Subhash Chandra
    Blekinge Institute of Technology. Blekinge Tekniska Högskola DITE.
    Towards Underwater UV Communication- Simulation and Experimentation on Penetration of UV Radiation into Sea water.2021Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    People around the globe are immensely trying to connect using light as carrier due to its low power consumption and high data transfer rates. Sound and microwaves are examples of other carriers that can be used, although they aren't nearly as efficient as light. A method of communicating is using light beneath the surface of the water. As the depth of the water increases, the temperature, pressure, and salinity of the water are changed. The refractive index of water is determined by the combination of all of these variable parameters. The goal of this thesis is to establish a relationship between changes in water temperature, salinity, and pressure resulting in changes of the refractive Index of the sea water. This thesis will demonstrate an empirical model of travelling the ultraviolet wave under sea water. We are acknowledging all of the properties that are change as the depth of the water is increasing. MATLAB was used to create a simulation of this scenario. Based on previous model of light traveling which covers the wavelengths between 400-700 nm, we have extended the model to ultraviolet range of light (200-400 nm).We design an experimental set up according to sea water parameters and then the experimental results are compared to the simulation results. The comparison shows the validity of our extension model.

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  • 13217.
    Ranga, Subhash Chandra
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Khatibi, Siamak
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Emam, Sayyed Mohammad
    Birjand University of Technology, IRN.
    Simulation of the UV Radiation Penetration into Seawater2022In: Proceedings of the 12th International Conference on Computer Engineering and Networks / [ed] Liu Q., Liu X., Cheng J., Shen T., Tian Y., Springer Science+Business Media B.V., 2022, p. 936-943Conference paper (Refereed)
    Abstract [en]

    People around the globe are immensely trying to connect using light as a carrier due to its low power consumption and high data transfer rates. Sound and microwaves are examples of other carriers that can be used, although they are not nearly as efficient as light. Using light under the water, refractive index is an important parameter in optical communication. Lights propagation quality depends on the temperature, pressure, and salinity. The aim of this work is to show a new approach to simulating the underwater environment, including depth as one of the parameters. In this paper, the proposed model examines the ultraviolet wavelengths between 200–400 nm wider than previous studies in light traveling. We verify the usefulness of our model by conducting a pilot study in a virtual environment. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

  • 13218.
    Ranganathan, Bharath
    Blekinge Institute of Technology, School of Engineering.
    Propagation Model for Fresh Food: Fundamental Principle and Measurement Analysis2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    The global fresh food tracking system (FFT) is widely used service based on monitoring a set of primary environmental conditions during the transportation of fresh food using the GSM, RFID and WSN. In order to provide design guidelines for such devices, it is therefore important to develop effective channel model and see how the fresh food affects the transmitted electromagnetic signals. In this thesis, we are mainly focusing on the channel measurements for different boxes of fresh food (potatoes) by measuring the channel at 2.4GHz and 865MHz in anechoic chamber and in indoor environment. Considering the optimum transmitter and receiver antenna, the Vector Network Analyzer and Spectrum analyzer are used for the collecting a substantial amount of measurements. During the measurements, both the channel impulse response and channel time variation was considered for computing different metrics that are mainly based on large scale fading and small scale fading. The simulation of channel model was done using the log-distance pathloss model and two filtered Gaussian model on Matlab. Finally, the measurement results were compared with simulated results for different boxes of fresh food and both models showed good match with obtained measurements, thus producing an efficient channel model.

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  • 13219.
    Rangannagari, Raghu Vamsi Sai
    et al.
    Blekinge Institute of Technology.
    Deverakonda, Sri Phani
    Blekinge Institute of Technology.
    Automated Solar Panel Shield: An IoT Approach2022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Context: Solar panels are exposed to different weather conditions and get damaged. Sand storms and hail storms could cause serious damage. However, they need to be used for human survival in almost every harsh condition possible.

    Objectives: Our goal is to design and create a working prototype of an automated solar panel shield. The meteorological conditions around the solar panels should be monitored, including wind speed, air quality, rain, and humidity. The shield automatically protects the solar panel based on the sensor data. The solar shield should even protect panels from harm from small animals.

    Methods: A microcontroller Arduino Uno is used. Various sensors are used to monitor multiple weather conditions, including an ultrasonic sensor, a rain sensor, a smoke sensor, and a custom-built anemometer. Based on daylight status, the stepper motor is activated to roll up the protective cover over the solar panel.

    Results: The output from all the sensors and actuators is verified. The values of the sensors are updated in the web application, the user can use that. The web application is used to monitor the weather conditions around solar panels.

    Conclusions: An working model of the shield is made, in addition, a cleaning system is made. A bird deterring system is also included. All the additional sensors for monitoring can be used for performance automation.

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    Automated Solar Panel Shield: An IoT Approach
  • 13220.
    Rangavajjula, Santosh Bharadwaj
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Design of information tree for support related queries: Axis Communications AB: An exploratory research study in debug suggestions with machine learning at Axis Communications, Lund2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context:

    In today's world, we have access to so much data than at any time in the past with more and more data coming from smartphones, sensors networks, and business processes. But, most of this data is meaningless, if it's not properly formatted and utilized. Traditionally, in service support teams, issues raised by customers are processed locally, made reports and sent over in the support line for resolution. The resolution of the issue then depends on the expertise of the technicians or developers and their experience in handling similar issues which limits the size, speed, and scale of the problems that can be resolved. One solution to this problem is to make relevant information tailored to the issue under investigation to be easily available.

    Objectives:

    The focus of the thesis is to improve turn around time of customer queries using recommendations and evaluate by defining metrics in comparison to existing workflow. As Artificial Intelligence applications can have a broad spectrum, we confine the scope with a relevance in software service and Issue Tracking Systems. Software support is a complicated process as it involves various stakeholders with conflicting interests. During the course of this literary work, we are primarily interested in evaluating different AI solutions specifically in the customer support space customize and compare them.

    Methods:

    The following thesis work has been carried out by making controlled experiments using different datasets and Machine learning models.

    Results:

    We classified Axis data and Bugzilla (eclipse) using Decision Trees, K Nearest Neighbors, Neural Networks, Naive Bayes and evaluated them using precision, recall rate, and F-score. K Nearest Neighbors was having precision 0.11, recall rate 0.11, Decision Trees had precision 0.11, recall rate 0.11, Neural Networks had precision 0.13, recall rate 0.11 and Naive Bayes had precision 0.05, recall rate 0.11. The result shows too many false positives and true negatives for being able to recommend.

    Conclusions:

    In this Thesis work, we have gone through 33 research articles and synthesized them. Existing systems in place and the current state of the art is described. A debug suggestion tool was developed in python with SKlearn. Experiments with different Machine Learning models are run on the tool and highest 0.13 (precision), 0.10 (f-score), 0.11 (recall) are observed with MLP Classification Neural Network.

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    BTH2018Rangavajjula
  • 13221.
    Ranjitkar, Hari Sagar
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Karki, Sudip
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Comparison of A*, Euclidean and Manhattan distance using Influence map in MS. Pac-Man2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context An influence map and potential fields are used for finding path in domain of Robotics and Gaming in AI. Various distance measures can be used to find influence maps and potential fields. However, these distance measures have not been compared yet.

    ObjectivesIn this paper, we have proposed a new algorithm suitable to find an optimal point in parameters space from random parameter spaces. Finally, comparisons are made among three popular distance measures to find the most efficient.

    Methodology For our RQ1 and RQ2, we have implemented a mix of qualitative and quantitative approach and for RQ3, we have used quantitative approach. Results A* distance measure in influence maps is more efficient compared to Euclidean and Manhattan in potential fields.

    Conclusions Our proposed algorithm is suitable to find optimal point and explores huge parameter space. A* distance in influence maps is highly efficient compared to Euclidean and Manhattan distance in potentials fields. Euclidean and Manhattan distance performed relatively similar whereas A* distance performed better than them in terms of score in Ms. Pac-Man (See Appendix A).

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  • 13222.
    Rao, Bandaru Lokeswara
    Blekinge Institute of Technology, School of Computing.
    Bitrate Analysis On First Person Shooter Games2010Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Multiplayer games are prominent now a days. In recent years real time multi player networked gaming has grown in popularity due to exciting challenges posed in by competing with human opponents. One of the types of multi player games is First Person shooter games.FPS games are becoming popular predominantly over wired networks. In FPS games delay, bitrate and inter packet arrival times has major roles because they determine who wins and loses the game. This thesis investigates the behavior of bitrate at different parts in the network and at different time scales, which involves analyzing of bitrate traces in each relevant stream of the disturbed network in the game i.e. identification of when the disturbance occurred in the traces, identification of what IP that was disturbed and simple statistics are made at different locations of the stream at same sample frequency. Finally we analyze the behavior of bitrate at different parts of the network and with the help of the statistics made out of them, we compare to the user experience. How the user felt at each and every second while playing the game and how experienced he is in playing the games is been considered and compared with the data which was already collected before in the Dream Hack winter 2007, Tele Communications department of Blekinge Institute of Technology, Sweden.This results thus suggests at which bit rate the network should flow in order to satisfy the end user, as the quality of experience that counts at the last.

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  • 13223.
    Rao, Peddi Srinivas
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Sreelatha, Vallabhaneni
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Implementation and Evaluation of Spectral Subtraction with Minimum Statistics using WOLA and FFT Modulated Filter Banks2014Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    In communication system environment speech signal is corrupted due to presence of additive acoustic noise, so with this distortion the effective communication is degraded in terms of the quality and intelligibility of speech. Now present research is going how effectively acoustic noise can be eliminated without affecting the original speech quality, this tends to be our challenging in this current research thesis work. Here this work proposes multi-tiered detection method that is based on time-frequency analysis (i.e. filter banks concept) of the noisy speech signals, by using standard speech enhancement method based on the proven spectral subtraction, for single channel speech data and for a wide range of noise types at various noise levels. There were various variants have been introduced to standard spectral subtraction proposed by S.F.Boll. In this thesis we designed and implemented a novel approach of Spectral Subtraction based on Minimum Statistics [MinSSS]. This means that the power spectrum of the non-stationary noise signal is estimated by finding the minimum values of a smoothed power spectrum of the noisy speech signal and thus circumvents the speech activity detection problem. This approach is also capable of dealing with non-stationary noise signals. In order to analyze the system in time frequency domain, we have implemented two different filter bank approaches such as Weighted OverLap Added (WOLA) and Fast Fourier Transform Modulated (FFTMod). The proposed systems were implemented and evaluated offline using simulation tool Matlab and then validated their performances based on the objective quality measures such as Signal to Noise Ratio Improvement (SNRI) and Perceptual Evaluation Speech Quality (PESQ) measure. The systems were tested with a pure speech combination of male and female sampled at 8 kHz, these signals were corrupted with various kinds of noises at different noise power levels. The MinSSS algorithm implemented using FFTMod filter bank approach outperforms when compared the WOLA filter bank approach.

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  • 13224.
    Rao, Shehryar
    Blekinge Institute of Technology, School of Computing.
    A COMPOSITE APPROACH TO DEAL WITH LOCALIZATION PROBLEMS IN WIRELESS SENSOR NETWORK2010Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Universal algorithm approach is very a unique and quite useful. It can be used for most of the localization problems. A number of research studies have been taken to evaluate the different algorithms. The literature review and surveys are the key sources to get the resultant algorithm. This thesis addresses different kind of localization problems and provides a universal solution for these problems. I have done a very important literature review and some industry based surveys. The result of surveys and literature review was a bit same, so it was quite easy to find solution for those similar problems. The idea behind this universal solution is very simple. I chose two algorithms which were quite useful in the localization and merge. The resultant algorithm proves more useful than other two algorithms. The author finds it very healthy and useful algorithm. Moreover, there is need to improve some aspects. There is need to implement this algorithm practically. Some sort of professional skills are required to make this algorithm worthy.

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  • 13225.
    RAO, THUMATI VENKATA
    Blekinge Institute of Technology, School of Engineering, Department of Signal Processing.
    DATA PROCESSING DESIGN OF WIDEBAND CODE DIVISION MULTIPLE ACCESS (WCDMA)2007Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Wideband Direct-Sequence Code Division Multiple Access (W-CDMA) is the emerging protocol for the next generation (3G) wireless communication systems. W-CDMA has been designed to add features such as multimedia capabilities, high data rates and multi-rate services to the existing wireless communication framework. Several standards for third generation systems have been proposed and developed by different industrial committees in countries such as the U.S, Europe and Japan. All these standards have accepted CDMA in one form or another as the multiple access method for wireless communications requirements. In this work, we study the implementation issues involved for one of the proposed Rate Compatible Punctured Convolution Coding (RCPC) to increase information rate in WCDMA, the detection algorithms for base-stations. It was found that these proposed algorithms for detection have different processing and precision requirements. In the rate compatible punctured convolution from each coded symbol some of the bits are punctured in order to achieve the higher information rate. At the same time decoding becomes quite easy even if some of the bits from the coded symbol are not available. We have written these algorithms for a single user at ideal conditions based on theory but not practically.

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  • 13226.
    Raouf, Victoria
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Verbal- och ickeverbal kommunikation och relationers betydelse i vårdyrket2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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  • 13227.
    Rapp, Carl
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Gamification as a tool to encourage eco-driving2016Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context: In this work a system, the eco service, is developed that incorporates elements from gamification to help drivers adapt to a more energy-efficient driving style. An energy-efficient driving style can help reduce fuel consumption, increase traffic safety and help reduce the emissions made from vehicles.

    Objectives: The main goal of this work is to explore ways of how gamification can be used in the context of eco-driving. Evaluating different elements and how they work in this context is important to help drivers to continue improving their driving style.

    Method: The eco service was tested on 16 participants where each participants was asked to drive a predetermined route. During the experiment the participants were given access to the eco service in order to gain feedback on their driving. Lastly interviews were held with each participant on questions regarding the use of gamification and how it can be improved in the context of eco-driving. The research was done in collaboration with a swedish company, Swedspot AB, that works with software solutions for connected vehicles.

    Results & Conclusions: Positive results were found on the use of gamification. Participants reported that the eco service made them more aware of their driving situation and how to improve. Game elements with positive influence were reward and competitive based and helped motivate the driver to improve.

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  • 13228.
    Rappe, Björn
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Rappe, Helena
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    A multiple case study of indirect management control systems in mature multinational technological product R&D companies active in the Greater Copenhagen Region2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This is a case study of how management control system is implemented in multi international R&D focused companies in Greater Copenhagen. The focus has been to see if the implementations of management control system with a focus on the indirect control systems are in line with the current research, in the aspect of promoting innovation. A literature review of known frameworks and related theories as well as a focused study of the latest publications within the area was preformed and presented. The study includes data collection from interviews and analysis of three companies, all with a major office or headquarter in Greater Copenhagen.The findings from the study is that mature companies in the Greater Copenhagen region are well aligned with latest research in some areas within cultural and personnel control. Clear similarities can be seen for almost all areas. However, differences do exist in ways of rewarding innovation, codes of conduct, physical arrangements, job rotations and trainings.

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  • 13229. Rasche, Andreas
    et al.
    Feinbube, Frank
    Tröger, Peter
    Rabe, Bernhard
    Polze, Andreas
    Predictable Interactive Control of Experiments in a Service-Based Remote Laboratory2008Conference paper (Refereed)
    Abstract [en]

    Remote and virtual laboratories are commonly used in electronic engineering and computer science to provide hands-on experience for students. Web services have lately emerged as a standardized interfaces to remote laboratory experiments and simulators. One drawback of direct Web service interfaces to experiments is that the connected hardware could be damaged due to missed deadlines of the remotely executed control applications. Within this paper, we suggest an architecture for predictable and interactive control of remote laboratory experiments accessed over Web service protocols. We present this concept as an extension of our existing Distributed Control Lab infrastructure. Using our architecture, students can conduct complex control experiments on physical experiments remotely without harming hardware installations.

  • 13230.
    Rasheed, Amer
    et al.
    Blekinge Institute of Technology, School of Computing.
    Khan, Muhammad Mustansar Ali
    Blekinge Institute of Technology, School of Computing.
    Dispatching strategies to evaluate performance for automated guided vehicles in the transport of containers2009Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Automated Guided Vehicles hav gained much attention in the industry especially with relevance to container handling at the seaports.

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  • 13231.
    Rashid, Muhammad Usman
    et al.
    Blekinge Institute of Technology, School of Computing.
    Garapati, Balakrishna
    Blekinge Institute of Technology, School of Computing.
    Prevention of Spyware by Runtime Classification of End User License Agreements2009Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Spyware is a threat to Internet users because it may obtain valuable information from the users’ machines without their consent. The existing anti- spyware techniques are not found to be accurate enough in the prevention or detection of spyware. According to the law in many countries, vendors are bound to mention any inclusion of spyware in the End User License Agreement (EULA) of the associated software. Moreover, this agreement must be accepted by the user to have the software installed on the user machine. Thus, if the user accepts the agreement without reading it, he or she will unknowingly accept all the regulations mentioned in the EULA. Consequently, this study emphasizes that the EULA can be used to classify the software as spyware or legitimate by using data mining algorithms. We validate our approach by implementing an application and compare it with existing EULA analysis tools.

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  • 13232.
    RASHID NAZARZADEH, MAJIDI
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Investigation of Ball Mill and Vibrating Screen Parameters on Efficiency of Zinc Ash Recovery2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The main objective of this article is to investigate the effect of ball milling parameters, including the values of rotational speed, number of milling balls, and time of milling, as well as the amount of loaded ash, on the efficiency of zinc separation from its oxide and hence, the efficiency of zinc recovery from hot-dip galvanizing ash.The ball mill processing parameters were determined and optimized the processing parameters were then analysed and the optimum combination of ball mill processing parameters were suggested. All the tests were done in an industrial scale and are applicable to any hot-dip galvanizing plant. The milled ash was remelted and the efficiency of zinc recovery was obtained and compared to non-milled ash. The results showed a significant zinc recovery rate of 88 % from the largest ash particles (screened with mesh 10) with a ~17 % increase in the total rate of zinc recovery from three ranges of particle sizes (screened with mesh 10, 20 and 40).

  • 13233.
    Rashid, Rizwan
    et al.
    Blekinge Institute of Technology, School of Computing.
    Kaleem, Babur
    Blekinge Institute of Technology, School of Computing.
    Evaluating Layouts for Automated Transport System using Simulation Approach2009Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Industries such as trade, manufacturing and transportation have undergone significant changes due to the globalization concept. Sea ports play a very important role in building and strengthening the economies of countries worldwide. Due to the high rate of production, the work load has increased at the ports which resulted into financial as well as capacity problems. As a result of such problems, cost optimized and automated solutions are being developed and introduced at the ports. In the horizontal transport system of the sea ports, AGVs are one of those automated solutions used to transport containers from ships to yard and vice versa. Newer and more practices are being employed to make the efficient transportation of these AGVs. Numexia has recently introduced a new version of Cassette AGVs called Zero-Emission C-AGV. A conceptual model is developed for Zero-Emission C-AGVs and different layouts are evaluated using multi agent-based simulation. The greedy algorithm has been used for the efficient dispatching of jobs. The Simulation will carry out the dispatching of jobs for C-AGVs between quay area and yard using different layouts and scenarios for the unloading operation.

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  • 13234.
    Rashid, Rubina
    et al.
    Blekinge Institute of Technology, School of Management.
    Hassan, Riaz ul
    Blekinge Institute of Technology, School of Management.
    Analyses of Financial Viability of Rural Cooperatives (PBS) under Rural Electrification Board of Bangladesh2007Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Rural Electrification Board (REB) of Bangladesh was founded in October 1977 as a semi-autonomous government agency reporting to the Ministry of Power Energy and Minerals Resources, which was responsible for electrifying rural Bangladesh. From its beginning it operates several rural electrification program's to use electricity as a means of creating opportunities for improving agricultural production and enhancing socio-economic development in rural areas, whereby there would be improvements in the standard of living and quality of life for the rural people. To achieve the objectives of rural electrification program, the Board established rural cooperatives named ''Palli Bidyut Samities (PBS)'' based on the model of Rural Electric Co-operatives in USA under the universal principle of co-operative, democratic decentralization and ownership of consumers. It operates and manages a rural distribution system within its area of jurisdiction. REB of Bangladesh is making tremendous progress through its 67 rural cooperatives (PBSs) in providing electricity to the rural population of Bangladesh. Although remarkable progress was made in increasing access to electricity in rural areas, concerns remain in terms of financial sustainability of PBSs majority of which are unable to cover debt service liabilities from the revenues they generate. In our thesis work we try to find ways how to improve the financial performances of the PBSs. We start with a brief overview of the current financial performance of the PBSs. Then we try to identify the factors and their impact which affect the financial performance. The impact has been analyzed using aggregate system loss, individual operating performance and financial performance. we also provide recommendations of finding ways to improve the financial performance of the PBSs by looking at areas of efficiency improvements in the existing and planned taken-over areas, customer-mix, elimination of outages, and tariff increase.

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  • 13235.
    Rask, Mikael
    et al.
    Linnéuniversitetet, SWE.
    Albinsson, Gunilla
    Linnéuniversitetet, SWE.
    Safipour, Jalal
    Linnéuniversitetet, SWE.
    Wenneberg, Stig
    Linnéuniversitetet, SWE.
    Andersson, Lisbet
    Linnéuniversitetet, SWE.
    Carlsson Blomster, Monika
    Linnéuniversitetet, SWE.
    Ozolins, Lise-Lotte
    Linnéuniversitetet, SWE.
    Borg, Christel
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Lindqvist, Gunilla
    Linnéuniversitetet, SWE.
    Validation of the verbal and social interaction questionnaire for nursing students: The focus of nursing students in their relationship with patients2018In: Journal of Nursing Education and Practice, ISSN 1925-4040, E-ISSN 1925-4059, Vol. 8, no 4, p. 81-88Article in journal (Refereed)
    Abstract [en]

    The Verbal and Social Interaction Nursing Students questionnaire (VSI-NS) has been created to measure the development ofverbal, social and interactional skills of nursing students with patients, from their perspective in nursing care. The aim of thepresent study was to determine the construct validity and internal consistency reliability of the questionnaire. The study had amethodological and developmental design and was carried out in four steps: adjustment of the items, face validity, data collectionand data analysis. The number of items was reduced from 48 to 31. The factor analysis of the final 31 items resulted in four quitedistinct factors: “Inviting to talk about feelings and thoughts”, “Building a caring relationship”, “Encouraging social and practicalaspects in daily life” and “Caring towards health and wellbeing”. The results showed satisfactory psychometric properties interms of content validity, construct validity and the internal consistency reliability of the questionnaire. It could be concluded thatthe original conceptual model could serve as a theoretical foundation to explain and understand nurses’ caring interactions withtheir patients

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  • 13236.
    Rask, Ulf
    et al.
    Blekinge Institute of Technology, Department of Software Engineering and Computer Science.
    Mannestig, Pontus
    Blekinge Institute of Technology, Department of Software Engineering and Computer Science.
    Improvement of hardware basic testing: Identification and development of a scripted automation tool that will support hardware basic testing2002Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    In the ever-increasing development pace, circuits and hardware are no exception. Hardware designs grow and circuits gets more complex at the same time as the market pressure lowers the expected time-to-market. In this rush, verification methods often lag behind. Hardware manufacturers must be aware of the importance of total verification if they want to avoid quality flaws and broken deadlines which in the long run will lead to delayed time-to-market, bad publicity and a decreasing market share. This paper discusses how a basic testing team may use an automated test environment in order to establish intellectual control regarding the testing and verification in a large hardware project. Company-specific factors that influence the design of an automated test environment are analyzed and a suggestion of a suitable environment is made. A prototype of the environment is constructed so that the project results may be evaluated in the real world. The thesis support the academic field in stating that large chips are hard to verify and that script-automation tools are one way to make verification of larger chips possible. Hardware verification should be made without complicated and untested software so that the debugging process only has the hardware to deal with. The thesis also indicates that an automated test tool increases the test rate, provides better test coverage and make regression testing feasible.

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  • 13237.
    Rasmus, Jensen
    et al.
    Blekinge Institute of Technology, School of Planning and Media Design.
    Markus, Lundberg
    Blekinge Institute of Technology, School of Planning and Media Design.
    Phobia, ett grafiskt koncept2012Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    Genom att samla kunskap om psykoser och analysera spel och film utvecklar vi ett grafiskt koncept för ett skräckspel. Genom intervjuer tar vi reda på hur konceptet uppfattas av spelare och spelutvecklare. Konceptet saknade grafiskt narrativ, vilket gjorde att spelets tema tolkades olika av alla respondenter. Vi diskuterar vikten av ett grafiskt narrativ, och hur spelets grafiska stil kan fortsätta utvecklas.

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  • 13238.
    Rasmussen, Daniel
    et al.
    Blekinge Institute of Technology, School of Health Science.
    Robé, Marie
    Blekinge Institute of Technology, School of Health Science.
    Vårdpersonals uppfattning om munvård – Litteraturstudie –2007Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Bakgrund: Munvård är en viktig del av omvårdanden för patienters välbefinnande. Daglig rengöring av tänder och munhåla är grunden till att förebygga olika sjukdomstillstånd. Undersökningar visar att kunskapen om munvård är låg hos vårdpersonal. Syfte: Syftet med studien är att belysa vårdpersonals uppfattning om munvård. Metod: En litteraturstudie har gjorts där fem artiklar ingår. En kvalitativ analysmetod har använts. Resultat: Resultatet visar på att vårdpersonal har uppfattningen att de fått för lite utbildning i munvård men att de ändå prioriterar munvård högt. Vårdpersonals utbildning har betydelse för hur de upplever att utföra munvård. Slutsats: Det behövs mer utbildning för vårdpersonal i området munvård och en manual för hur de ska utföra munvård.

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  • 13239.
    Rasmussen, Frode A S Storesund and Janus G
    Blekinge Institute of Technology, School of Management.
    Motivation of Scandinavian Knowledge Workers: a survey of methods and their effectiveness2011Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The aim of this thesis was to identify and examine contemporary motivational theories and see how they fit to the Scandinavian knowledge worker. Two theories (SDT and 4-drive) were selected for empirical research. One survey of a total of 139 respondents from organisations located in Scandinavia showed that the SDT theory cannot be considered more effective than other motivational theories when it comes to motivation of Scandinavian knowledge workers. It was further shown that 4-drive theory could be effective in the Scandinavian culture, but ineffective in terms of monetary incentives. The literature research showed that there is a strong need for further research in the topic of motivating knowledge workers in the Scandinavian work environment.

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  • 13240.
    Rasmussen, Kris
    et al.
    Blekinge Institute of Technology, School of Management.
    Tetteh, Daniel Odei
    Blekinge Institute of Technology, School of Management.
    The Impact of Inflation on Business and Trade: a case study of Ghana and Canada2007Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The thesis looks at the relationship between inflation, interest rate, exchange rate and GDP for a developed country (Canada) and a developing country (Ghana). Through a detailed literature search looking at the economies of Ghana and Canada as well as statistical analysis using least squares and regression models the following questions were addressed: 1) What is the impact of inflation on businesses and trade? 2) Most businesses depend on loans to run their business operations. What is the correlation between inflation and interest rate both in Ghana and Canada? 3) How is inflation affecting the exchange rate development of import and export? What is the effect on businesses that depend mostly on imported raw material for production? 4) How is monetary policy used in Canada to control inflation and how does this compare to the policy being used in Ghana?

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  • 13241.
    Rasmussen, Tomas
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Analys och optimering av värmesystemet vid centrallasarettet i Karlskrona, för att möjliggöra en ekonomisk och hållbar drift vid låg last2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Commissioned by the Blekinge County Council, I have been tasked to investigate the possibilities for optimizing the hospital in Karlskrona systems for hot water and steam production based on what is economically beneficial and environmentally sustainable in the summer period 15 May to 30 September. Today, the production of hot water and steam is provided by a wood chip boiler during winter, spring and autumn and with the combination of an electrical boiler and district heating during the summer due to the wood chip boiler not being able to be fired toward the low loads that occur during the warmer months. The combined production of both the electric boiler and district heating, has proven to be considerably more expensive than if the production could have been done with the wood chip boiler, due to the high electricity- and district heating prices. Blekinge County Council wishes to examine what measures could be taken for a more sustainable and economical production during the warmer months. The measures that have been investigated in this report is the application of an absorption chiller for increased heating surface, a small additional chip boiler and the cost of district heating at a possible cessation of steamproduction. The report shows that the proposed solutions are possible options for an economically beneficial and environmentally sustainable production during the warmer months. All solutions resulting reportedly in a cheaper and more sustainable production of hot water and steam, and with repayment periods that are lower than the depreciation and economic life. The solution that in short terms proves more profitable, in terms of cost per MWh and paybacktime, is the application of an absorption chiller. The report shows, however, that a greater cooling load than what has been investigated in the report is desired for  optimized sustainability. A small additional chip boiler also results in a lower productioncost than today, albeit with a longer paybacktime due to a higher investment cost. Advantages of an additional chip boiler, which is mentioned in the report, is that this option also results in a more sustainable and cheaper supplement at the tip of the loads during the colder months. Continued production with district heating alone is a third option which is being investigated, and that could be seen as advantageous if the hospital would choose to settle the central steam system. This work shows that the proposed solutions would be approximately 140-279 kronor cheaper per MWh during the solutions economical lifetime and with the current prices an installment periods of 0-24 years.

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  • 13242.
    Rasmussen, Victor
    Blekinge Institute of Technology, School of Planning and Media Design.
    Det negativa spelet: Rädsla i relation till varför vi spel2013Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    In this survey I am studying in more detail on the motivation for playing games in relation to negative experiences in games. This survey provides a better understanding of how a game developer motivates people to play computer games and video games. The motivation in games is very important as games requires the player's interaction with the world for the game to move forward. Developers will also get a better understanding on how to impact the player with feelings, in this case the feeling of fear. As a game designer I want to affect the player during the time of ”play” with some kind of feeling or message. In this case it's the emotion of fear, which is a negative emotion and a feeling that we humans mostly avoid in our daily life. It is also a feeling that we always have some attraction to and something we get a kick out of, whether we're talking about games, movies or the real life. (Level Design Rudolf Kremers, 2009) I have created a production, that is testing some of the theories I find in my research. The production is also a test of my own theories of fears and motivations.

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  • 13243.
    Rasmusson Wright, Ylva
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Hedlund, Simon
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Cross-platform Frameworks Comparison: Android Applications in a Cross-platform Environment, Xamarin Vs Flutter2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Good performance is important for an application to run smoothly for the end user, but good tools and documentation are just as important for a developer in order tobe able to create good applications in the shortest amount of time.  This paper is comparing the cross-platform frameworks Flutter and Xamarin to find the respective strengths of the frameworks and which one is the better option and in what aspect, the newer Flutter or the well established Xamarin. We did this by studying related works to the topic as well as building applications in each framework with methods to test the performance of the applications, all the while trying out the tools and documentation of each framework. Our initial hypothes is was that Xamarin as a mature framework would perform better on average and it would also have more well developed tools. However we instead found Xamarin severely lacking compared to the newer Flutter framework and were at best equal or just slightly better. Flutter outperformed Xamarin in CPU performance, at times 3 times better than Xamarin, Flutter’s application size being almost half of the Xamarin application and the Flutter application load times were also faster. The tools were for most parts equal but the results of the documentations were split, with Xamarin having better component documentation with code examples for the components and Flutter having inconsistencies in documentation structure. However the Xamarin documentation was severely lacking in updated documentation and confusing instructions at places. The only things Xamarin performed better on were the number of lines in the codeas well as being marginally better performing at the RAM capacity test. The conclusion would be that Flutter is a well performing framework that continues to develop while Xamarin feels stagnant and most of its development seems to have slowed down over the last two years

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    Cross-platform Frameworks Comparison - Android Applications in a Cross-platform Environment, Xamarin Vs Flutter
  • 13244.
    Rastegar, Damoon
    Blekinge Institute of Technology, School of Engineering.
    Modification of Aeroelastic Model for Vertical Axes Wind Turbines2013Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    In wind turbines, flow pressure variations on the air-structure interface cause aerodynamic forces. Consequently the structure deforms and starts to move. The interaction between aerodynamic forces and structural deformations mainly concerns aeroelasticity. Since these two are coupled, they have to be considered simultaneously in cases which the deformations are not negligible in comparison to the other geometric dimensions. The purpose of this work is to improve the simulation model of a vertical axis wind turbine by modifying the structural model from undamped Euler-Bernoulli beam theory with lumped mass matrix to the more advanced Timoshenko beam theory with consistent mass matrix plus an additional damping term. The bending of the beam is then unified with longitudinal and torsional deformations based on a fixed shape cross-section assumption and the Saint-Venant torsion theory. The whole work has been carried out by implementing the finite element method using MATLAB code and implanting it in a previously developed package as a complement. Finally the results have been verified by qualitative comparisons with alternative simulations.

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  • 13245.
    Rastegar, Shahin
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Thulander Graore, Angélique
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    An Approach For Cable Drum Structure Optimization2022Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Performing optimization of structures is always of great interest. There are several different ways to optimize steel structures. Today, several companies are having difficulties with their cable drums during transport. Cable drums with full cable load become heavy and make it difficult to transport. This paper aims to examine existing published research and approaches, with a focus on steel optimization. This paper has two research objectives, the first one is to examine the possibilities for optimizing cable drums in terms of mass without compromising load capacity or yield stress. The second question is to determine how much of the weight/mass of cable drums may be reduced via optimization. To optimize it, measurements, cable drum modeling, research studies, and connecting suitable software's will be carried out in this paper. Participation Action Research and Reverse Engineering methodologies were implemented in combination. A literature review was performed to get a deeper understanding of the methods. A systematic literature review was done to identify available approaches and techniques for structural steel optimization. In order to optimize the cable drum, Excel and Autodesk Inventor were connected through Visual Basic Applications (VBA). The optimization process workflow acted with a server and two clients, where Excel acted as the server and Autodesk Inventor and MATLAB acted as clients. It was found that this was a suitable method for optimizing the cable drum were to work with an optimization process that included connecting a server with clients. The MATLAB function fmincon was applied with both interior-point algorithm and Sequential Quadratic Programming (SQP). The optimal design variables for the cable drum were established, and the objective minimization was accomplished by reducing the cable drum mass of 2495.20 kg. The cable drums mass was minimized to 101.86 kg. The literature review was systematically conducted to find available approaches and methods for structural steel optimization. The combination of Participatory Action Research (PAR) and Reverse Engineering (RE) was ideal for this project since it enabled both approaches to gather data on cable drum capacity and alternative optimization strategies.The schematic optimization workflow was appropriate to apply throughout the implementation phase. The workflow gave the user complete control over the optimization process, and the automated process saved time and was simple to adapt.

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  • 13246.
    Ravara, Maria Madalena
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Stöcker, Fee
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Kasarabada, Divya
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Dalouhamouch, Chaima
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Navigating the Tides of Sustainability:  Gaps in IMO Legislation and the Shipping Industry´s Perception on a Transition Towards Sustainability2023Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Considered the most cost and energy-efficient mode of transportation, the shipping industry is responsible for 90% of trade and is predicted to grow. Although it has been central for the development of nations, this activity is not exempt of negative externalities, largely contributing for unsustainability. A sustainable transition is, thus, required to address the overall supper wicked problem of the sustainability challenge. This thesis employed qualitative research composed of two main research phases. The first one assesses the alignment of IMO´s legislation with a sustainable transition for the shipping industry. A document analysis of this regulation was done by applying a methodology based on sustainability principles from the FSSD. Our findings point to multiple misalignments with both social and ecological principles, as well as a lack of a systems perspective of the industry. The second phase of the research explores what different practitioners perceive is needed for the sustainability transition. For this, nine semi-structured interviews were conducted. An inductive data analysis resulted in 15 main findings, addressing different topics perceived as relevant for this transition. This included the need for a just and equitable transition; enhanced governance and more stringent regulations; as well as fair and unbiased treatment of seafarers. 

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    Navigating the Tides of Sustainability: Gaps in IMO Legislation and the Shipping Industry ́s Perception on a Transition Towards Sustainability
  • 13247.
    Ravattu, Radha
    et al.
    Blekinge Institute of Technology, School of Computing.
    Balasetty, Prudhviraj
    Blekinge Institute of Technology, School of Computing.
    Characterization of YouTube Video Streaming Traffic2013Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Online digital videos have made a revolutionary evolution since the social networking sites such as YouTube and Hulu have emerged. These websites facilitate video accessable and only a click away. Ever increasing internet traffic and a very significant increase in the use of videos in social networking has led to the problem of network congestion. Consequently, it becomes essential and imperative to analyze the traffic flow and comprehend how it is being delivered from the server. If the flow of traffic is analyzed appropriately and if the analysis methodology is understood properly, the service providers can understand the reasons for network congestion and avoid them. Given the context, a few research studies have thrown light on video delivery procedure of YouTube with emphasis on methodology. A few other works have examined the location of video storage and the strategy involved in sending the video packets, yet the packet delivery strategy for different types of videos (based on popularity) has not been explained in detail. The present research fills this gap. This research explores the origin of the source of the video and the exact strategy being followed by YouTube in delivering popular and non-popular videos. This thesis also discusses the analysis methodology of packet delivery in detail.

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  • 13248.
    Ravela, Srikar Chowdary
    Blekinge Institute of Technology, School of Computing.
    Comparison of Shared memory based parallel programming models2010Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Parallel programming models are quite challenging and emerging topic in the parallel computing era. These models allow a developer to port a sequential application on to a platform with more number of processors so that the problem or application can be solved easily. Adapting the applications in this manner using the Parallel programming models is often influenced by the type of the application, the type of the platform and many others. There are several parallel programming models developed and two main variants of parallel programming models classified are shared and distributed memory based parallel programming models. The recognition of the computing applications that entail immense computing requirements lead to the confrontation of the obstacle regarding the development of the efficient programming models that bridges the gap between the hardware ability to perform the computations and the software ability to support that performance for those applications [25][9]. And so a better programming model is needed that facilitates easy development and on the other hand porting high performance. To answer this challenge this thesis confines and compares four different shared memory based parallel programming models with respect to the development time of the application under a shared memory based parallel programming model to the performance enacted by that application in the same parallel programming model. The programming models are evaluated in this thesis by considering the data parallel applications and to verify their ability to support data parallelism with respect to the development time of those applications. The data parallel applications are borrowed from the Dense Matrix dwarfs and the dwarfs used are Matrix-Matrix multiplication, Jacobi Iteration and Laplace Heat Distribution. The experimental method consists of the selection of three data parallel bench marks and developed under the four shared memory based parallel programming models considered for the evaluation. Also the performance of those applications under each programming model is noted and at last the results are used to analytically compare the parallel programming models. Results for the study show that by sacrificing the development time a better performance is achieved for the chosen data parallel applications developed in Pthreads. On the other hand sacrificing a little performance data parallel applications are extremely easy to develop in task based parallel programming models. The directive models are moderate from both the perspectives and are rated in between the tasking models and threading models.

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  • 13249.
    Ravelli, Mathias
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Betalningsvilja för hållbar transport: Vad kännetecknar en betalande konsument?2020Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    ABSTRACT

    Background and purpose: The purpose of this study is to fill the gap which is present in the science area of sustainable transport. According to the literature study that has been performed within this thesis it has not been possible to identify any studies which investigates what individuals that has a willingness to pay (WTP) for sustainable transport has in common. By investigating if there are any differences between these individuals the study aims to find a common ground in terms of socioeconomic factors or general attitude towards the climate. By doing this, the science gap within this area will be reduced and companies can use the result to identify which kind of services this should be applied to. If more companies apply the sustainable transport choice, more individuals will be able to choose it and the climate footprint could become smaller. 

     

    Method: In order to find differences between individuals it is essential to apply a method which can be established in the science. By performing a qualitative pre-study of earlier science and literature science, questions have been constructed to create a foundation for a survey. The survey was performed digitally and included questions about the individual socioeconomic factors, general attitude towards the climate and their WTP for sustainable transport. After removal of non-essential answers 109 respondents was left which became the foundation of the analysis. The study is limited to the author’s social network represented by people living in Sweden.

     

    Result: The study has found common ground for individuals that has a WTP for sustainable transport. The socioeconomic differences of the individuals has no impact on their WTP for sustainable transport. An individual with WTP is known by its’ concern for the environment and by performing other climate smart choices in the everyday life.

     

    Conclusion: The result support, which has been proven by this study, that all companies have the possibility to apply sustainable transport regardless of what target group they have. Also, companies that have individuals that do other climate smart choices as a target group has even bigger chances of successfully implementing sustainable transport. 

    Keywords: Sustainable transport, Green transport, Willingness to pay

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  • 13250.
    Ravinath, Vijay
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Study on the Vibrations in the Discharge Pipe of Oil Flooded Screw Compressor2006Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Flow induced pulsation in piping are serious concern in refrigeration installations where noise and vibrations are critical factors. This report takes an insight look into the possible ways to minimise the noise and vibration due to pulsations. A modification of the discharge piping was done to reduce the noise produced by pressure pulsation in oil flooded screw compressor. It gets complex while trying to deduce the natural frequency of complicated piping with branches and bends. FEMLAB was used as simulation software. Reflection of waveform in piping masks the real amplitude of the pressure pulsation. A method based on signal processing was employed to decompose the incident and reflected wave.

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