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  • 2401. Chevul, Stefan
    et al.
    Isaksson, Lennart
    Fiedler, Markus
    Karlsson, Johan
    Lindberg, Peter
    Measurement of application-perceived throughput of an E2E VPN connection using a GPRS network2005Conference paper (Refereed)
    Abstract [en]

    N/A

  • 2402. Chevul, Stefan
    et al.
    Isaksson, Lennart
    Fiedler, Markus
    Lindberg, Peter
    Waltersson, Roland
    Network Selection Box: An Implementation of Seamless Communication2006Conference paper (Refereed)
    Abstract [en]

    In recent years it has become evident that mobility support will have profound impact on current and future wireless networks. Users expect service connectivity at any place at anytime without having to think about the underlying communication systems used in that particular moment in time. On this background, this paper presents a ready to deploy implementation of a mobility framework that supports seamless communication and represents an important enabler for adaptive applications through its simple QoS feedback mechanism. The framework selects the best available network through a decision algorithm that takes advantage of a link performance monitoring concept. The performance evaluation of the proposed framework is also presented in this paper.

  • 2403. Chevul, Stefan
    et al.
    Karlsson, Johan
    Isaksson, Lennart
    Fiedler, Markus
    Lindberg, Peter
    Strandén, Lars
    Measurements of Application-Perceived Throughput in DAB, GPRS, UMTS and WLAN Environments2005Conference paper (Refereed)
    Abstract [en]

    Communication services are expected to deliver the desired information in a timely manner without challenging the user’s patience. The corresponding offers by networks are reflected in user- or applications-perceived throughput, which is measured end-to-end for different mobile and wireless networks, namely Digital Audio Broadcast (DAB), General Packet Radio Service (GPRS), Universal Mobile Telecommunication Systems (UMTS), and Wireless Local Area Networks (WLAN). The measurements are based on passive monitoring of throughput statistics for active test traffic and reveal amongst others different kinds of changes of traffic burstiness induced by mobile up- and downlinks and by buffering, respectively. The results will be used for seamless communication, i.e. automatic network selection within the project PIITSA (Personal Information for Intelligent Transport Systems through Seamless communications and Autonomous decisions) aiming at maintaining user-perceived performance and security at the desired levels while keeping communication cost as small as possible.

  • 2404.
    Chezan, Tony
    et al.
    Tata Steel, NLD.
    Khandeparkar, Tushar
    Tata Steel, NLD.
    Van Beeck, Jeroehn
    Tata Steel, NLD.
    Sigvant, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Strategies for increasing the accuracy of sheet metal forming finite element models2018In: Journal of Physics: Conference Series, Institute of Physics Publishing , 2018, no 1Conference paper (Refereed)
    Abstract [en]

    Accurate modelling of sheet metal forming can contribute significantly to reduction of lead time and development costs in manufacturing industries. The current way to improve the finite element model accuracy is to combine advanced constitutive material models and advanced tribological models. For model validation purposes the geometry of the forming tools needs to be updated and the most relevant parameters of the forming press needs to be incorporated. The addition of a simple and easier to control model test can offer additional information on difficult to characterize parameters of the industrial process. The industrial validation case presented in this paper demonstrates that the Tata Steel constitutive material model has similar prediction capability as the state of the art material model used at Volvo Cars for regular process development for automotive parts production. In both industrial and model tests the tribological system appears to affect significantly the overall model accuracy. The model tests suggests that further work is needed in order to improve the tribological model description at high contact pressure and high strain levels. © 2018 Institute of Physics Publishing. All rights reserved.

  • 2405.
    Chiem, Jenny
    Blekinge Institute of Technology, School of Management.
    Bloggning: om upplevelser kring publicering av personlig information för offentligheten2007Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Det har blivit alltmer populärt att ”blogga”. Ordet blogg uppstod under 1990-talet och sedan dess har ett stort antal människor tagit det av fenomenet. Publicering av information på Internet kan innebära att vem som helst kan få tillgång och detta var en utgångspunkt för studiens syfte, som var att få förståelse för hur studiens deltagare upplever att publicera personlig information för offentligheten via bloggar. För att nå förståelse användes kvalitativa intervjuer. Den primära frågeställningen var att undersöka om det är sökandet efter bekräftelse från andra människor som är kärnan i bloggandet. Begreppet självkänsla blev centralt då bekräftelse ska ses ur en psykologisk synvinkel. Studiens resultat visade tecken på att bloggning ses mer som ett sätt att skriva av sig på, närmare bestämt som ett dagboksskrivande än bekräftelse i den bemärkelsen ”duger jag?”. Slutsatsen kunde vara att samtliga deltagare vill göra sina röster hörda via sitt bloggande. Avslutningsvis verkade studien visa en bild på att bloggskrivandet är här för att stanna.

  • 2406.
    chikkala, sai sandeep
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    EVALUATION CRITERIA FOR SELECTION OF API PRODUCTS: Practitioners' Perspective2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context. The approach of developing software systems with the use of third partycomponents i.e. COTS or OSS has increased globally. In this study API product refers toeither a software component or a software service or both packaged together, that can beaccessed through an API. Developers are faced with plethora of alternative choices to selectan API product. With this increase in components adoption, API product providers are facedwith challenge of designing their product to be more attractive than others. This needs theproviders to be educated about the developer behavior when they choose an API product.Understanding the selection practices of developers can help providers to improve thepackaging of API products, making them more suitable for selection.

    Objectives. The objectives of this study is to investigate the criteria that developers usewhen reasoning about acceptability of a software component.

    Methods. A background study is performed to identify the evaluation criteria proposed inthe literature. An empirical study using Qualitative content analysis is performed. In the study the 480 reviews of different API products are analyzed to understand the criteria frompractitioners’ perspective.

    Results. 9 relevant criteria that developer use to reason about accepting or rejecting an APIProduct are identified. 30 sub criteria related to the 9 criteria are described in the study.

    Conclusions. This study concludes that the identified 9 criteria play an important role indeveloper assessment of the API product. It is also found that the criteria have significantimpact on the ratings of API product. These criteria could guide API product providers tomake better choices when developing the product.

  • 2407.
    Chikumbo, Irene
    et al.
    Blekinge Institute of Technology, School of Management.
    Efremovska, Irena
    Blekinge Institute of Technology, School of Management.
    An Emerging Innovation Agenda: Leveraging Intrapreneur’s Influence on the Dynamic Capabilities of a Company2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Purpose: The purpose of this paper was to identify and establish the relationship between intrapreneurs and the Dynamic Capabilities (DC) framework in a company. This relationship aided us in exploring whether intrapreneurs could positively influence the sensing, seizing and transforming of innovations. Findings: This paper explored and identified a possible applicability of intrapreneurial theory and dynamic capabilities in the Innovation Value Chain. Ten intrapreneurial skills that could be carried out by an Innovation Agent (IA) in various parts of the innovation chain were identified. The results showed how these intrapreneurial skills could positively influence the dynamic capabilities and contribute to an improvement in sensing, seizing and transforming of idea in full-scale innovations. Although it was shown that intrapreneurs positively influence the sensing, seizing and transforming as separate elements of the dynamic capabilities framework, it was also discovered that intrapreneurs play a crucial role in managing the ‘dynamic capabilities’ and ‘Innovation Value Chain’ as a whole. They do this by synthesizing and connecting the separate elements. In addition, a roadmap illustrating the focus areas of these intrapreneurial skills within the innovation chain was formulated during the study. Research Implications: The research findings contribute to the understanding the Innovation Value Chain through the lens of the Dynamic Capabilities Framework which consists of sensing, seizing and transforming and how the role of intrapreneurship could positively influence the dynamic capabilities and contribute to a better innovation process. Practical Implications: The practical implications of this study contribute to the innovation management of big high tech global companies. The use of intrapreneurs contributes to addressing the bureaucracy and innovation barriers that big companies usually create as part of their organizational structure and culture. Although it was discovered that all employees and managers should act as intrapreneurs, the research showed that in big global companies there is a need for a separate role of Innovation Agent, who would be responsible for seeing the ‘big picture of the innovation process’, supporting and navigating the employees with innovative ideas through the complexity of innovation process, and playing diverse intrapreneurial roles in order to creatively address the barriers to innovation in the company.

  • 2408.
    Chikumbo, Irene
    et al.
    Blekinge Institute of Technology, School of Engineering.
    Öztürk, Ahmet Eren
    Blekinge Institute of Technology, School of Engineering.
    Tate, Taryn
    Blekinge Institute of Technology, School of Engineering.
    Social Entrepreneurship as a Catalyst to Increase Equality in South Africa2012Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Inequality is a complex issue and an integral part of the sustainability challenge. This research examines how social entrepreneurs (SE) can be catalysts to increase equality in South Africa. In order to navigate through the complexity of inequality within this context, the authors designed a conceptual model. The Framework for Strategic Sustainable Development (FSSD), based on Strategic Sustainable Development (SSD) concepts, such as backcasting and systems thinking, was incorporated into the research to ensure a systematic and comprehensive link to sustainability. The FSSD and the conceptual model assisted in exploring how social entrepreneurship could be a strategic approach to increase equality in South Africa, and in turn, help to open the social trap and contribute towards creating a more sustainable society. During the research process, the researchers identified nine high impact areas that could be addressed by SE and other stakeholders. These include: awareness; attitude and mind-set; a shared understanding; government support; education and training; economic environment; financial sustainability; social and physical infrastructure; and collaboration and asset sharing. The aim of these high impact areas is to help foster social entrepreneurial development and guide SE in strategically increasing equality in South Africa.

  • 2409.
    Chilakapati, Sindhura
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Mamidala, Sri Lakshmi Jyothirmai
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Study of Vibration Transmissibility of Operational Industrial Machines2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Industrial machines during their operation generate vibration due to dynamic forces acting on the machines. This vibration may create noise, abrasion in the machine parts, mechanical fatigue, degrade performance, transfer to other machines via floor or walls and may cause complete shutdown of the machine. To limit the vibration pre-installation, vibration isolation measures are usually employed in workshops and industrial units. However, such vibration isolation may not be sufficient due to varying operating and physical conditions, such as machine ageing, structural changes and new installations etc. Therefore, it is important to assess the quantity of vibration generated and transmitted during true operating conditions.

    The thesis work is aimed at the estimation of vibrational transmissibility or transfer from industrial machines to floor and to other adjacent installed machines. This study of transmissibility is based on the measurement and analysis of various spectral estimation tools such as Power Spectral Density (PSD), Frequency Response Function (FRF) and Coherence Function. The overall study is divided into three major steps. Firstly, the initial measurements are carried in BTH on simple Single Degree of Freedom (SDOF) systems to gain confidence in measurement and analysis. Then the measurements are performed on a Lathe machine “Quick Turn Nexus 300-II” in a laboratory at BTH. Finally, the measurements are taken on the machines of an Industrial workshop (KOSAB). The analysis results revealed that vibration measurements in industry are challenging and not easy as measurement in labs. Measurements are contaminated by noise from other machines, which degrade the coherence function. However, vibration transferred from one machine to the floor or other machines may be studied using FRF and PSD. Appropriate further isolations may be employed based on the spectral analysis.

  • 2410.
    Chilik, Inna
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Edens, Kim L.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Klusch, Kurt
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Ralph, Peter
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Assessment of Sustainability Maturity Models for Business Transformation2019Independent thesis Advanced level (degree of Master (One Year)), 20 HE creditsStudent thesis
    Abstract [en]

    Business organisations, given their size, influence, and global impact on finite planetary resources, are the key economic drivers contributing to unsustainable growth. Sustainability Maturity Models (SMMs) were developed as a tool to assist organisations to recognise and incorporate practices identified as pivotal to achieving business transformation. The Strategic Sustainable Development (SSD) approach was used to develop an analytical tool to assess the robustness of two of the aspects of SMMs, specifically structure and process. Interviews with model designers were also conducted. The research team identified key strengths limitations of SMMs.  

     

    The analysis revealed that SMMs have strength in starting the conversation with leadership and charting the way ahead for organizations by clearly defining the maturity level success criteria.

     

    These findings confirm the significant potential of SMMs infused by supporting process tools, to be a strong foundation for organisations on their sustainability journeys, aiding overall transformation of businesses. This in turn has the potential to shift the role of businesses in the larger socio-ecological system from being contributors to the sustainability challenge, to becoming active providers of solutions.

  • 2411.
    Chilukuri, Megh Phani Dutt
    Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
    Power Profiling of Network Switches2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context In the present world, there is an increase in the usage of the telecommunication networking services, as there is a need of efficient networking services in various fields which can be obtained by using the efficient networking components. For that purpose we have to know about the components parameters. One of the most important parameter is the energy usage of networking components. Therefore, there is a need in power profiling of the network switches.

    Objectives The objective of this research is to profile the power usage of different network components(Switches) for various load scenarios. Power measurements are done by using the open energy monitoring tool called emonpi.

    Methods The research method has been carried out by using an experimental test bed. In this research, we are going to conduct the experiments with different configurations to obtain different load conditions for sources and destinations which will be passed through DUT(Device Under Test). For that DUT’s we will measure power usage by monitoring tool called emonpi. Then the experiments are conducted for different load scenarios for different switches and results are discussed.

    Conclusion From the results obtained, the Power profiles of different DUT’s are tabulated and analyzed. These were done under different ports and load scenarios for Cisco2950, Cisco3560 and Netgear GS-724T. From the results and analysis it can be stated that the power usage of Cisco 2950 is having the maximum power usage in all the considered scenarios with respect to packet rate and also number of active ports. The Netgear-GS724T is having the minimum power usage from the three switches as it having the green switch characteristics in all scenarios. And the Cisco 3560 is in between the above two switches as it is having energy efficient management from Cisco. From this we have proposed a simple model for energy/power measurement.

  • 2412.
    Chinedu, Ezeonwu-Emmanuel
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Oji, Ukoha-Christian
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Simulation of Solutions to Excessive Vibration Problems of Pedestrian Footbridges2008Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Footbriges are often prone to vibrations induced by pedestrian loading. They are long and slender and their weight is moderate. One of the classical and famous examples is the transverse vibrations encountered on the millennium bridge in London. Horizontal vibration problems have received considerable attention due to millennium bridge vibration problem, but potential problems relating to vertical vibrations are more common. Vibrations from pedestrian loads are mostly limited to vibration frequencies below 5Hz. Most pedestrian bridges have several vibration modes below the above mentioned frequency. Increasing the stiffness could be a remedy to this vibration problem. And for a slender structure, increasing the stiffness often implies a corresponding increas in mass of the structure, whereby the desired effect is notachieved. Instead damping is often used to reduce the excessive vibration problem of footbridges by attaching additional dampers to the structre. London Millennium bridge was modelled inthis thesis in order to show the effect of tuned mass damper. There was a substantial reduction of the displacement of the bridge when tuned mass dampers were added to the bridge model.

  • 2413.
    Chinta, Ruthvik
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Measurement of Game Immersion through Subjective Approach2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context. People in recent times are getting engaged more often in playing video games. Few play for enjoyment, few play for stress relaxation and so on. Generally, the degree of involvement of a player with the game is described as game immersion. People when immersed into playing a game doesn't realize that they are getting dissociated with the outside world and are losing track of time.

    Objectives. In this research, the main objective is to explore the relationship between the game immersion and game experience using the five factors of game immersion. In addition, the study also involves exploring different methods that can be used to measure game immersion.

    Methods. In this research, initially literature review has been conducted to explore the meaning of game immersion and also different methods that can be used to measure it and next user studies in the form an experiment was conducted to measure game immersion. After the experiment was conducted regression analysis was performed on the data obtained from the results to describe the relation between game immersion and game experience.

    Results. After the experiment participants were asked to answer the IEQ questionnaire and the answers obtained from the questionnaire are analyzed using regression analysis. An inverse linear regression was observed between game immersion and game experience.

    Conclusions. After analyzing the data, from the observed inverse linear regression, it is concluded that game immersion levels decrease with the increase in the game experience.

  • 2414.
    Chintakuntla, Abhiram
    Blekinge Institute of Technology, School of Engineering.
    Keystroke Resilience in Laptop Acoustics Using Wiener Beamformer and Spectral Subtraction2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Nowadays, Laptops and Personal computers are increasingly being used to capture audio in various communication scenarios such as video conferencing, recordings of meetings, VOIP communications and lectures for archival purposes and audio/video instant messaging. Many of these scenarios often face unique problem of additive noise that of the user simultaneously typing on the keyboard. For example, to take notes while recording a meeting using the laptops local microphone array. The quality of speech signals captured by microphones is severely distorted by Keystroke noise which degrades the quality of speech. These degradation's lower the intelligibility of speech signal, So that listener’s ability to understand the message suffers. Thus there is a need to suppress the keystroke noise in recorded speech signals that results in significant perceptual improvement. In this thesis, the enhancement of speech signal by the suppression of keystroke noise is done through a unique combination of two algorithms i.e. Wiener Beamformer and Spectral Subtraction by Geometrical Approach. Wiener Beamformer is implemented based on subband approach. Both the algorithms individually and unique combination of both are implemented and performance is compared relative to each other by considering different performance measures i.e. Signal to Noise ratio (SNR) Improvement and PESQ. All the systems are tested with various positions of noise and speech source with reference to the microphone array and distance from speech source to microphone array is also varied. Analysing the results, the unique combination of both the algorithms proved to be efficient in terms of SNR improvement when compared to individual systems. The Spectral Subtraction algorithm does not improve the speech intelligibility effectively whereas Wiener Beamformer as an individual system works perfectly with keystroke noise suppression in speech signal and have relatively high PESQ values when compared to the values of combined system. Finally, the Spectral Subtraction reduces PESQ significantly at low SNR, the Spectral Subtraction adds few dB in improvement when combined with Weiner Beamformer, but at very high cost of decrement of PESQ.

  • 2415.
    Chintala, Bala Venkata Sai Sundeep
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Objective Perceptual Quality Assessment of JPEG2000 Image Coding Format Over Wireless Channel2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A dominant source of Internet traffic, today, is constituted of compressed images. In modern multimedia communications, image compression plays an important role. Some of the image compression standards set by the Joint Photographic Expert Group (JPEG) include JPEG and JPEG2000. The expert group came up with the JPEG image compression standard so that still pictures could be compressed to be sent over an e-mail, be displayed on a webpage, and make high-resolution digital photography possible. This standard was originally based on a mathematical method, used to convert a sequence of data to the frequency domain, called the Discrete Cosine Transform (DCT).

    In the year 2000, however, a new standard was proposed by the expert group which came to be known as JPEG2000. The difference between the two is that the latter is capable of providing better compression efficiency. There is also a downside to this new format introduced. The computation required for achieving the same sort of compression efficiency as one would get with the original JPEG format is higher. JPEG is a lossy compression standard which can throw away some less important information without causing any noticeable perception differences. Whereas, in lossless compression, the primary purpose is to reduce the number of bits required to represent the original image samples without any loss of information. The areas of application of the JPEG image compression standard include the Internet, digital cameras, printing, and scanning peripherals.

    In this thesis work, a simulator kind of functionality setup is needed for conducting the objective quality assessment. An image is given as an input to our wireless communication system and its data size is varied (e.g. 5%, 10%, 15%, etc) and a Signal-to-Noise Ratio (SNR) value is given as input, for JPEG2000 compression. Then, this compressed image is passed through a JPEG encoder and then transmitted over a Rayleigh fading channel. The corresponding image obtained after having applied these constraints on the original image is then decoded at the receiver and inverse discrete wavelet transform (IDWT) is applied to inverse the JPEG 2000 compression. Quantization is done for the coefficients which are scalar-quantized to reduce the number of bits to represent them, without the loss of quality of the image. Then the final image is displayed on the screen.

    The original input image is co-passed with the images of varying data size for an SNR value at the receiver after decoding. In particular, objective perceptual quality assessment through Structural Similarity (SSIM) index using MATLAB is provided.

  • 2416.
    Chinthalapalle, Chandrasekhar Reddy
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Gorrepati, Haribabu
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Analysis of Compliance Maps with MATLAB Toolbox2005Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Structural dynamics engineers are asked to make measurements for distinguishing differences between two structures. A frequent approach is to compare the modal parameters by change in Modal Assurance Criterion behaviour which focuses only on the Eigen values and Eigen vectors. A Graphical method of comparison was found for simple structures, which considers the spatial distribution of the entire frequency response spectrum. Point compliances represented by a color scale are measured at short intervals along reference line on a structural edge and the result is a three dimensional representation of dynamic behaviour. Experiments were conducted and MATLAB toolbox along with Graphical User Interface for compliance maps was built.

  • 2417.
    Chinthalapndi, Husam M. Hassan & Ajaykumar S.
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Investigation of Methods to Detect Defects in Thin Layered Materials2005Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Cost effective and reliable damage detection is critical for the utilization of thin layered materials and microstructures. This Thesis presents a brief overview of conventional NDT methods and the usage of unconventional NDT methods applicable to thin layered materials, and the conclusion of applicability of these methods for damage detection in thin layered materials.

  • 2418. Chirumalla, Koteshwar
    et al.
    Bertoni, Alessandro
    Aditya, Aditya
    Johansson, Christian
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Bertoni, Marco
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Performance measurement framework for product-service systems development: a balanced scorecard approach2013In: International Journal of Technology Intelligence and Planning (IJTIP), ISSN 1740-2832, E-ISSN 1740-2840, Vol. 9, no 2, p. 146-164Article in journal (Refereed)
    Abstract [en]

    The paper proposes a framework for analysing the performances of product-service systems (PSSs) development processes using a balanced scorecard (BSC) as an instrument to guide the implementation and the evaluation of new methods and tools. Emerging from a case study in the aerospace industry, the paper discusses the main challenges in PSS development and proposes a performance measurement framework for PSS development based on multi-criteria indicators. Finally, the benefits of a framework for PSS development performance measurement are discussed.

  • 2419. Chirumalla, Koteshwar
    et al.
    Bertoni, Alessandro
    Parida, Aditya
    Johansson, Christian
    Bertoni, Marco
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Performance Measurement Framework for Product-Service System Development: A Balanced Scorecard Approach2013In: International Journal of Technology Intelligence and Planning (IJTIP), ISSN 1740-2832, E-ISSN 1740-2840, Vol. 9, no 2, p. 146-164Article in journal (Refereed)
    Abstract [en]

    The Product-Service System (PSS) paradigm is recognized as a means for companies to increase the value perceived by the customers, thus gaining competitive advantage beyond traditional ‘pure product’ offerings. Researches have shown the necessity to rethink design processes in a PSS context, in order to drive the successful integration of product and service features in early design phases. In the last few years, several new approaches have been proposed, however little attention has been paid on how to translate these approaches into action and on how to evaluate their performances and effectiveness. This paper proposes a framework for analysing the performances in PSS development process using a Balanced Scorecard approach, as a tool to guide the implementation and the evaluation of new methods and tools in the early design phases. The paper starts with discussing the main challenges encountered when designing PSS, and then, adopting an aerospace industry as an example, to propose an application of the Balance Scorecard for the implementation and measurement of PSS development. Finally, the main pros and cons are discussed in relation to strengths and weaknesses of using balanced scorecard in PSS development. The framework developed in this paper can provide a useful guidance for the managers in measuring the performances of the PSS development process.

  • 2420.
    Chirumalla, Koteshwar
    et al.
    Luleå tekniska universitet.
    Bertoni, Marco
    Johansson, Christian
    Luleå tekniska universitet.
    Experience feedback using social media: from the product lifecycle phases to the design practices2013In: Product-Service Integration for Sustainable Solutions: Proceedings of the 5th CIRP International Conference on Industrial Product-Service Systems / [ed] Horst Meier, Berlin, Germany, 2013, Vol. 5, p. 459-471, article id 043Conference paper (Refereed)
    Abstract [en]

    Many companies have been using lessons learned practices as one oftheir key knowledge management initiatives to capitalize on past experiences.For product development companies, learning from product lifecycle phasesgives a true competitive advantage to improve the next generation of products.However, companies are still struggling in capturing and sharing lessonslearned and applying them in new situations. Based on this consideration, thepaper proposes a video-based approach–using social media technologies–as away to leverage continuous capturing and sharing lessons learned from productlifecycle phases to design practices. The paper presents the findings of a casestudy within the aerospace industry, which investigates the current industrialpractices with regard to experience feedback, and illustrates the implementationof a video-based approach. Further, the conceptual mock-up of video-based lessons learned sharing portal and its social platform that are aimed to support the design practices are illustrated.

  • 2421. Chirumalla, Koteshwar
    et al.
    Larsson, Andreas
    Luleå University of Technology.
    Bertoni, Marco
    Luleå University of Technology.
    Larsson, Tobias
    Luleå University of Technology.
    Knowledge sharing across boundaries - Web 2.0 and product-service system development2011Conference paper (Refereed)
    Abstract [en]

    In recent years there has been a growing interest among product development organizations to capitalize on engineering knowledge as their core competitive advantage for innovation. Capturing, storing, retrieval, sharing and reusing of engineering knowledge from a wide range of enterprise memory systems have become crucial activities of knowledge management practice in competitive organizations. In light of a changing and dynamic enterprise definition, including a move towards Product-Service System (PSS) development, this paper discusses some of the limitations of current enterprise systems in reusing engineering knowledge across functional and corporate boundaries. Further, the paper illustrates how Web 2.0-based collaborative technologies can leverage cross-functional knowledge for new PSS development projects through an open, bottom-up, and collective sense-making approach to knowledge management.

  • 2422.
    Chishti, Omar Saleem
    Blekinge Institute of Technology, School of Management.
    Evolution of Product Management in Web 2.02009Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    The aim was to study how product management is practiced in emerging startups in today‟s hi-tech world with emphasis on companies working in Web 2.0. Following key problems were assessed: 1. Often, most companies do not have a defined produc management approach. 2. Product managers use their experience when assigned products rather than a uniform approach throughout the organization suggesting confusions within the teams. 3. Most Tech-startups are too focused on technological advancements that they ignore their intended clients – a reason why products fail.

  • 2423.
    Chita, Meera
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Kijtanasopa, Kulvarong
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    von Petersdorff-Campen, Sophia
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Stam, Lennart
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    The Purpose of Business: Where value meets Strategic Sustainable Development2018Independent thesis Advanced level (degree of Master (One Year)), 20 HE creditsStudent thesis
    Abstract [en]

    The current global economic paradigm, centred on growth, is a significant barrier in the transition towards a sustainable society. Business-as-Usual companies operating within this paradigm are perceived to prosper at the expense of society and environment which is not viable on a finite planet. The need to rethink the purpose of business is inevitable as maximising shareholder value, has been deemed insufficient to create asustainable society.

    This study aimed to explore: how business models can be used to create value that supports Strategic Sustainable Development. Previous research proposed that the concept of Business Models for Sustainability helps business place sustainability at the core of all consideration. A qualitative research was chosen for which we employed the Framework for Strategic Sustainable Development and combined a literature review with an investigation of three expert groups to answer our research question.

    Our findings showed that, compared to other value forms, system value is the most appropriate concept for businesses striving towards sustainable development. Based on our findings, six themes emerged that businesses need to address to accelerate the speed of change towards sustainability. To make a relevant contribution to the intended audience,a prototype has been developed based on our findings.

  • 2424.
    Chittajallu, Sai Kiran
    Blekinge Institute of Technology, School of Engineering.
    MOBILE PHONE ACOUSTICS: PERFORMANCE EVALUATION OF SPECTRAL SUBTRACTION AND ELKO’S ALGORITHM USING SPEECH QUALITY METRICS2013Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    In recent years a great deal of effort has been expended to develop methods that determine the quality of speech through the use of comparative algorithms. These methods are designed to calculate an index value of quality that correlates to a mean opinion score given by human subjects in evaluation sessions. In this work PESQ (ITU-T Recommendation P.862) which is the new ITU-T benchmarking for objective measurement of speech quality. In mobile phone acoustics, the presence of noise and room reverberation play a vital role in degrading the speech signal and therefore, spectral subtraction and Elko’s beamformer has been used for noise reduction. Weighted Overlap and Add method (WOLA) filter bank is used for frequency domain analysis of the speech signal. Elko’s algorithm is used for designing a differential microphone array, implemented by connecting two omni directional elements to form back-to-back cardioid directional microphones. The output from the Elko’s beamformer is then used as an input to spectral subtraction based on minimum statistics reducing further noise and to enhance the quality of the speech signal. The performance of this system is analysed by calculating the value of PESQ as a speech quality measure. The better the value the PESQ, the better is the output speech quality. Signal to Noise Ratio (SNR) is used to measure the amount of noise in the restored speech signal. Reverberation Index is also used to measure the amount of reverberation effect present in the restored speech signal.

  • 2425.
    Chivukula, Krishna Varaynya
    Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
    Monitoring and Analysis of CPU load relationships between Host and Guests in a Cloud Networking Infrastructure: An Empirical Study2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 2426.
    Chiwenda, Madock
    Blekinge Institute of Technology, School of Engineering, Department of Systems and Software Engineering.
    Requirements Engineering Skills Development: A Survey2004Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Software projects are among the failure prone projects in engineering and software requirements problems have been attributed to be one of main reasons to software project failures. There are many techniques and methodology developed for practitioners to use in working with software requirements, which makes it impossible for one to master them during formal education. In addition, many of the practitioners are coming from different disciplines. Thus they are required to learn in practice. Previous studies have shown informal learning (i.e. not planned or run by institutions or organizations) to be more effective and more used in workplace learning situations. The study investigates how the requirements engineering skills are and can be learned in workplace especially informally. By comparing the results obtained by the literature study and empirical study the recommendations are given on how one can recognise, utilise, and encourage the informal learning activities to develop requirements engineering skills. The study does not rule out the need to have the formal education and training in requirements engineering but identify it as an important prerequisite and/or complement. It provides insight on how informal learning practices are utilised by practitioners who are rather experienced in requirements engineering and how they could try to recognise and/or utilise other learning opportunities presented by previous literature. It furthermore offers general recommendations of how to utilise the informal learning for developing requirements engineering skills and other related disciplines.

  • 2427.
    Chodapaneedi, Mani Teja
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Manda, Samhith
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Engagement of Developers in Open Source Projects: A Multi-Case Study2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

     In the present world, the companies on using the open source projects have been tend to increase in the innovation and productivity which is beneficial in sustaining the competence. These involve various developers across the globe who may be contributing to several other projects, they constantly engage with the project to improve and uplift the overall project. In each open source project, the level of intensity and the motivation with which the developers engage and contribute vary among time.

    Initially the research is aimed to identify how the engagement and activity of the developers in open source projects vary over time. Secondly to assess the reasons over the variance in engagement activities of the developers involved in various open source projects.

    Firstly, a literature review was conducted to identify the list of available metrics that are helpful to analyse the developer’s engagement in open source projects. Secondly, we conducted a multi-case study, that involved the investigation of developer’s engagement in 10 different open source projects of Apache foundation. The GitHub repositories were mined to gather the data regarding the engagement activities of the developers over the selected projects. To identify the reasons for the variation in engagement and activity of developers, we analysed documentation about each project and also interviewed 10 developers and 5 instructors, who provided additional insights about the challenges faced to contribute in open source projects.

    The results of this research contain the list of factors that affect the developer’s engagement with open source projects which are extracted from the case studies and are strengthened through interviews. From the data that is collected by performing repository mining, the selected projects have been categorized with the increase, decrease activeness of developers among the selected projects. By utilizing the archival data that is collected from the selected projects, the factors corporate support, community involvement, distribution of issues and contributions to open source projects and specificity of guidelines have been identified as the crucial and key factors upon the success of the open source projects reflecting the engagement of contributors. In addition to this finding the insights on using open source projects are also collected from both perspectives of developers and instructors are presented.

     This research had provided us a deeper insight on the working of open source projects and driving factors that influence engagement and activeness of the contributors. It has been evident from this research that the stated factors corporate support, community involvement, distribution of issues and contributions to open source projects and specificity of guidelines impacts the engagement and activeness of the developers. So, the open source projects minimally satisfying these projects can tend to see the increase of the engagement and activeness levels of the contributors. It also helps to seek the existing challenges and benefits upon contributing to open source projects from different perspectives.

  • 2428.
    Chodeshwar Korsa Veera Bhadraiah, Dora Bharadwaj
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Stress Analysis of Bogie Frame Structure2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Bogie frame is an important and integral member of bogie. In Indian Railways, LHB (Linke Hofmann Busch) coaches are used as passenger coaches. They are equipped with FIAT bogie frames. Inorder to overcome the limitations of the existing FIAT bogie frame structure, a new bogie frame structure namely New CASNUB Bogie Frame is designed to equip with LHB coach. The New CASNUB Bogie Frame design is validated by conducting Stress analysis using ANSYS Mechanical APDL software. The stresses induced in both the frame structures are compared. Stresses induced in the New CASNUB Bogie frame are lesser than in the FIAT Bogie frame and are within the allowable stress limits of material used. New CASNUB Bogie Frame can be used as an alternative for LHB coaches in Indian Railways.

  • 2429.
    CHODISETTI, RAKESH ANIL
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    DASARI, BALA RAMA KRISHNA
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    H.264 VIDEO CODING ARTIFACTS: MEASUREMENT AND REDUCTION OF FLICKERING2014Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    H.264 video compression technique is currently one of the most widely used video codec for video compression and transmission. It is very important to maintain the quality of video with compression. Our research work mainly focuses on finding the various artifacts caused in the video due to compression using H.264 video technique. Blocking, ringing and flickering are the main artifacts found in the H.264 compression. Blocking and ringing are reduced mostly with the use of in loop filter in the H.264 codec. Even though blocking and ringing are reduced successfully, flickering is still seen in intra coded frames. Flickering is a temporal artifact which is otherwise known as mosquito noise is caused by change in the luminance values of the stationary region due to use of various prediction techniques . We propose a temporal median filter which can successfully reduce flickering effect in the H.264 video. The performance of the proposed filter is evaluated using sum of squared difference (SSD) metric.

  • 2430.
    Chohan, Imran Riaz
    Blekinge Institute of Technology, School of Planning and Media Design.
    Identity, hyperreality and Science fiction: Matrix and Neuromancer2012Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    My Bachelor’s thesis is a comparative analysis between humans and machines in a science fiction novel (Neuromancer) and a movie (Matrix). I explored in these works how the machines used technologies to influence on the humans. I used examples of characters from the text and movie along with the references of other writers writing on the same topic to help convey my message. I explored mainly the identity and reality issues among characters. William Gibson in Neuromancer portrays that technology has become a part of human body. While in the Matrix we see how machines are taking control on humans. In my thesis I started with Neuromancer and write about identity and reality issues of characters and artificial intelligences. In the second part of the thesis I write the same with the characters of the movie Matrix but also I compared these characters with characters of Neuromancer. Some other discussions in my thesis are about hyperreality, simulation, simulacra with reference to mostly Baudrillard. Overall this thesis explores the issues of identity and reality to the characters in the works and also to the readers as well. Key Terms: Identity, Reality, Hyperreality, Simulation, Simulacra.

  • 2431.
    Chokkarapu, Anil
    Blekinge Institute of Technology, School of Engineering.
    Acoustic Fan Noise Cancellation in a Laptop Microphone System2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Speech communication involving audio conferencing, video conferencing, teleconferencing via laptops became greatly influenced in office environments i.e. between employer and employee, and also influenced in personal life meetings between friends or in-between parents and children. These meeting conversations will mostly disturbs by annoying noise, i.e. fan noise which is produced by laptop cooling fan, which suffers at the both ends of communication due to this noise. With this noise effect the intelligibility of original speech is degraded between the conversations of meetings. So there is need of enhancing the speech from noisy speech environment in the communication. Thus speech enhancement is emerging technology in the communication and signal processing filed. So this thesis focuses on attenuating the noise produced by laptop cooling fan, with use of different speech enhancement algorithms. In this thesis we implement a multichannel Microphone Array (MA) of linearly arranged two microphones with different speech enhancement algorithms in spatial frequency domain. As the implementation involves frequency domain, we design a filter bank which is back bone structure of thesis, which is used to transform the signals received by microphone array into subband sequence, this subbands are processed through enhancement algorithms to attenuate noise, and then finally used to reconstruct the estimated original speech signal in time domain. The speech enhancement algorithms, involve beamforming technique i.e. Wiener BeamForming (WBF), and Spectral Subtraction (SS). Here we utilize a Direction Of Arrival (DOA) technique, to localize the speech source based on Time Difference Of Arrival (TDOA) in frequency domain only. Here we implements different systems involving individual WBF and SS algorithms, and also hybrid combination of algorithms WBF and SS, to suppress the fan noise. These systems were implemented at different positions of speech and noise sources. These systems were implemented and evaluated using simulation tool Matlab. The objective quality measures used to validate the systems are Signal to Noise Ratio Improvement (SNRI) and Perceptual Evaluation Speech Quality (PESQ) measure. The systems were validated with a pure speech combination of male and female sampled at 16 KHz, and fan noise recorded in the real time of anechoic environment. The systems are simulated at different SNR ratios of 0dB, 5dB, 10dB, 15dB, 20dB. The simulation result shows that hybrid system proves to be efficient in reduction of noise at higher SNR ratios, with compromise of speech quality. Whereas the individual beamformer system proves to be very highly efficient in reducing the noise while maintaining high quality in speech at both high and low SNR’s, whereas the spectral subtraction individual alone reduces a noise sufficiently only but its speech quality is very poor in performances. Also at different positions the systems were simulated, at the position where DOA of noise is 90 then all systems works highly efficient in reducing noise since SNRI are around 40dB to 50 dB while maintaining speech quality.

  • 2432.
    Chokwatthananon, Chatnicha
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Lööf, Carolina
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Digital mognad på individnivå: En studie om digital mognad hos de anställda i en kommunal verksamhet2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background. Digital maturity is an important topic for the public sector to respond the higher demands on digital solutions. Only 46 percent of the public sectors has a clear digitization strategy. Different organizations have different levels of digital maturity fulfillment. There are several reasons why organizations are interested in increasing the digital maturity. In order to increase efficiency, degree of innovation, customer value, improve decision making through digital transformations. Employees are the most important resource for an organization’s digital transformation. That is the reason why the organization should ensure their employees’ level of digital maturity addition to organizational development. By studying the municipality’s digital maturity, it will contribute to a research on the digital maturity on an individual level form the employees’ perspective.

    Purpose. The purpose of this thesis is to contribute with knowledge about how municipal employee’s digital maturity appears and to access the factors that are important to consider while implementing new technology in the organization. The factors will contribute to practical applications that encourage a higher level of employees’ digital maturity.

    Method. Based on the purpose, a qualitative study has been conducted. Twelve municipal employees with different background, position, and gender were interviewed to collect empirical data for a larger perspective on the whole municipality and IoT, Internet of Things, has been used as an investigation tool for this study. The analysis of the empirical data was based on our own definition of digital maturity at an individual level, which was based on previous research. By using the definition and other theoretical sources, the empirical material has been analyzed.

    Analysis and conclusion. The result of the thesis unveiled that there is a huge variation of the digital maturity level on municipal employees regarding to IoT. The main categories that the digital maturity is based on are individual's attitude, knowledge and use of the technology. The study unveiled that there is an interplay between these three categories. The factors that affect thesis categories also have an impact on the digital maturity on an individual level as well. The factors with an impact on municipal employees’ digital maturity are: individual interest, work tasks, experience, manager or leader, digitization strategy and technical education.

  • 2433. Chongtay R., A.
    et al.
    Hansson, Thomas
    Blekinge Institute of Technology, School of Management.
    Kjaer, C.
    van Heugten, L.
    A Virtual Collaborative Didactic: Experimental Design in a Local Context2004Conference paper (Refereed)
    Abstract [en]

    Based on a pilot study at a school where pupils work together exploring a virtual world (Fifth Dimension 5D), the objective of this article is to investigate the potential of software, interaction and integration related to instruction. Foci are set on a conceptual development of a virtual collaborative didactic. More concretely, we explore mediated interaction in collaborative weblogs between pupils managing classroom and computer room congenial problems, tasks and assignments. The objectives and foci are set on development of an integrated didactic on English and computer competence. From a starting point where the design of a virtual learning environment is investigated and developed, the idea of weblogs, agency, instruction and integration is portrayed as a situated approach for operating 5D as a game, a mystery and a challenge. The design of the study has motivated the whole class of pupils, as well as inspired and increased narrative text production.

  • 2434.
    Chowdary, Gannamaneni Geetha
    Blekinge Institute of Technology, School of Engineering.
    Acoustic Echo cancellation inside a Conference Room using Adaptive Algorithms2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    The whole dimension of communications has been changed by the rapid growth of technology. Today people are more interested in hands-free com-mucation, which makes use of loud speaker and high gain microphone, in place of the old modeled wired telephone. The main advantage of wireless system is that, more than one person can participate in conversation while freely moving in the room. The presence of large acoustic coupling between speaker and microphone would produce a loud acoustic echo making the con-versation difficult. The term Acoustic Echo Cancellation (AEC) refers to a process of removing echo from the received signal that contains one or more delayed signals (copies of the original signal). The primary step while cancelling an echo is to identify the transmitted signal which reappears with some delay. Once the echo is identified it is cancelled by subtracting from transmitted signal. Echo cancellation can be done using either echo suppressors or echo cancellers, or in some case both. But suppressors support only half duplex communication leading to the invention of echo cancellers which allows both the speakers to talk at the same time. The main objective of this research is to model a room and cancel the acoustic echo being generated by a speaker and microphone. This dissertation provides a comparison of LMS, NLMS, LLMS and RLS adaptive algorithms in terms of echo return loss enhancement ( ERLE) value and provides the best suitable algorithm for usage in adaptive filters for AEC. AEC is simulated and results are evaluated by using Matlab

  • 2435.
    Chowdhery, Syed Azad
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Bertoni, Marco
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Data-driven value assessment of packaging solutions2018In: IFAC PAPERSONLINE, Elsevier, 2018, Vol. 51, no 11, p. 1119-1124, article id No. 11Conference paper (Refereed)
    Abstract [en]

    Research in Product Service Systems design increasingly focuses on how to develop ‘capabilities’ for assessing the value of solutions already in  a design project fuzzy front end. A datadriven approach shall then guide engineers in the process of identifying what to develop, and not merely to verify if a solution meets (or not) performance requirements. This process of frontloading problem identification and solution generation activities with models is of high interest to raise quality and lower risk and cost for the development work. The objective of the paper is to explore the use of a data-driven approach to enable value prediction of packaging material configurations in early design. Its main objective is to present a methodological approach and a framework to connect high-level aspects of customer value with simulations and analysis conducted on the mechanical properties of packaging material.

  • 2436.
    Chowdhery, Syed Azad
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Bertoni, Marco
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Modeling resale value of road compaction equipment: a data mining approach2018In: IFAC PAPERSONLINE, Elsevier, 2018, Vol. 51, no 11, p. 1101-1106, article id no.11Conference paper (Refereed)
    Abstract [en]

    Resale value is an important aspect to be addressed when companies aim to shift from one-sale models to Product Service Systems (PSS). In the initial stages of the PSS design process, it is beneficial to predict how the mechanical features of the PSS hardware will impact resale value, so to orient business strategy decisions accordingly. The objective of this work is to propose a methodology to model the resale value of road compaction equipment using data mining techniques. By scrapping and merging data sets from the machine manufacturer and from dealers of second-hand machines, the work discusses how the derived correlations may be used to populate value models for early stage decision making.

  • 2437.
    Chowdhury, Lutfun Nahar
    et al.
    Blekinge Institute of Technology, School of Management.
    Lamichhane, Prakash
    Blekinge Institute of Technology, School of Management.
    Rijal, Anisha
    Blekinge Institute of Technology, School of Management.
    Study on the Relationship between Business Planning and SMEs or Individual Entrepreneurship2010Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Objective: The objective of this study is to identify the role of business planning in SMEs. Attempts were made to figure out why the business planning is used and in what extent the planning are used by the entrepreneurs. In such case, studies were made to find whether the entrepreneurs use the business plan to achieve higher performance in their business or not. We assumed that a well developed plan leads to convenient access to finance and thereby improving the performance through various measures Methodology: In order to carry on the research, different literature and articles have been read extensively to structure the theoretical framework. To test our objective we have extensively studied literatures, journals and articles along with carrying out a telephone interview on a short number of specific questions. Conclusion: The analysis and conclusion were based on the literatures and the interviews. We relied on a response of 8 SMEs between one to five years old to test our hypothesis. We were able to see the positive relationship between business planning and bank finance. But the data doesn‟t reveal that planning had any significantly direct relation with improving the performance of the business but it does have positive benefits. The findings of this research gives the idea that a business plan is useful in other context besides attracting finance like as a guide, for increasing management efficiency. The respondent also supported those facts but could not provide any significant evidence to their assumptions. Lastly, based on the outcome of the study some recommendations were offered to the prospective entrepreneurs and interest people.

  • 2438.
    Chowdhury, Mohammad
    et al.
    Blekinge Institute of Technology, School of Computing.
    Iqbal, Mohammad
    Blekinge Institute of Technology, School of Computing.
    A new solution approach for simultaneous mobility issues in seamless handover2012Conference paper (Refereed)
    Abstract [en]

    This paper proposes a new solution approach for the simultaneous mobility issues in seamless handover. An alternative scheme is designed to minimize handover latency between two different networks with location management support while simultaneous handover occurs. One of the most emerging techniques in recent research projects for mobility management is mobile Stream Transmission Control Protocol (mSCTP). The multi-homing feature of Stream Control Transmission Protocol (SCTP) and dynamic address reconfiguration (DAR) extension of SCTP are applied in the proposed solution to achieve improved seamless performance. We used an additional Location Server (LS) to ensure location management between simultaneously moving mobile nodes (MNs) while simultaneous handover occurs. This research is dedicated to design a new model of simultaneous mobility based on 'Step-length' and the implementation of the model i.e., mSCTP with LS to solve the simultaneous mobility issues. 'Step-length' is defined as the random distance travelled by the simultaneously moving MNs in each step when location changes. The proposed scheme implemented on NS2 and performance evaluations are scrutinized to demonstrate the comparison of proposed simultaneous handover latency with LS and in absence of LS. The results show that our proposed approach has improved performance in reducing handover delay as well as handling simultaneous mobility issues in seamless handover.

  • 2439.
    Chowdhury, Moyamer
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Telecommunication Systems.
    Alam, Aminul
    Blekinge Institute of Technology, School of Engineering, Department of Telecommunication Systems.
    Study Comparison of WCDMA and OFDM2007Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Wideband Code Division Multiple Access (WCDMA) is one of the main technologies for the implementation of third-generation (3G) cellular systems. It is based on radio access technique proposed by ETSI Alpha group and the specifications was finalised 1999. WCDMA is also known as UMTS and has been adopted as a standard by the ITU under the name “IMT-2000 direct spread”. The implementation of WCDMA will be a technical challenge because of its complexity and versatility. The complexity of WCDMA systems can be viewed from different angles: the complexity of each single algorithm, the complexity of the overall system and the computational complexity of a receiver. In WCDMA interface different users can simultaneously transmit at different data rates and data rates can even vary in time. WCDMA increases data transmission rates in GSM systems by using the CDMA air interface instead of TDMA. WCDMA is based on CDMA and is the technology used in UMTS. WCDMA is the dominating 3G technology, providing higher capacity for voice and data and higher data rates. The gradual evolution from today's systems is driven by demand for capacity, which is required by new and faster data based mobile services. WCDMA enables better use of available spectrum and more cost-efficient network solutions. The operator can gradually evolve from GSM to WCDMA, protecting investments by re-using the GSM core network and 2G/2.5G services. Orthogonal Frequency Division Multiplexing (OFDM) - technique for increasing the amount of information that can be carried over a wireless network uses an FDM modulation technique for transmitting large amounts of digital data over a radio wave. OFDM works by splitting the radio signal into multiple smaller sub-signals that are then transmitted simultaneously at different frequencies to the receiver. OFDM reduces the amount of crosstalk in signal transmissions. 802.11a WLAN, 802.16 and WiMAX technologies use OFDM. It's also used in the ETSI's HiperLAN/2 standard. In addition, Japan's Mobile Multimedia Access Communications (MMAC) WLAN broadband mobile technology uses OFDM. In frequency-division multiplexing, multiple signals, or carriers, are sent simultaneously over different frequencies between two points. However, FDM has an inherent problem: Wireless signals can travel multiple paths from transmitter to receiver (by bouncing off buildings, mountains and even passing airplanes); receivers can have trouble sorting all the resulting data out. Orthogonal FDM deals with this multipath problem by splitting carriers into smaller subcarriers, and then broadcasting those simultaneously. This reduces multipath distortion and reduces RF interference allowing for greater throughput. In this paper we have discussed about these two methods of third generation radio transmission system which are WCDMA and OFDM with various aspects. In between these two radio transmission technique, a better choice will be investigated.

  • 2440.
    Chowdhury, Moyamer
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Telecommunication Systems.
    Alam, Aminul
    Blekinge Institute of Technology, School of Engineering, Department of Telecommunication Systems.
    Study Comparison of WCDMA and OFDM2007Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Wideband Code Division Multiple Access (WCDMA) is one of the main technologies for the implementation of third-generation (3G) cellular systems. It is based on radio access technique proposed by ETSI Alpha group and the specifications was finalised 1999. WCDMA is also known as UMTS and has been adopted as a standard by the ITU under the name “IMT-2000 direct spread”. The implementation of WCDMA will be a technical challenge because of its complexity and versatility. The complexity of WCDMA systems can be viewed from different angles: the complexity of each single algorithm, the complexity of the overall system and the computational complexity of a receiver. In WCDMA interface different users can simultaneously transmit at different data rates and data rates can even vary in time. WCDMA increases data transmission rates in GSM systems by using the CDMA air interface instead of TDMA. WCDMA is based on CDMA and is the technology used in UMTS. WCDMA is the dominating 3G technology, providing higher capacity for voice and data and higher data rates. The gradual evolution from today's systems is driven by demand for capacity, which is required by new and faster data based mobile services. WCDMA enables better use of available spectrum and more cost-efficient network solutions. The operator can gradually evolve from GSM to WCDMA, protecting investments by re-using the GSM core network and 2G/2.5G services. Orthogonal Frequency Division Multiplexing (OFDM) - technique for increasing the amount of information that can be carried over a wireless network uses an FDM modulation technique for transmitting large amounts of digital data over a radio wave. OFDM works by splitting the radio signal into multiple smaller sub-signals that are then transmitted simultaneously at different frequencies to the receiver. OFDM reduces the amount of crosstalk in signal transmissions. 802.11a WLAN, 802.16 and WiMAX technologies use OFDM. It's also used in the ETSI's HiperLAN/2 standard. In addition, Japan's Mobile Multimedia Access Communications (MMAC) WLAN broadband mobile technology uses OFDM. In frequency-division multiplexing, multiple signals, or carriers, are sent simultaneously over different frequencies between two points. However, FDM has an inherent problem: Wireless signals can travel multiple paths from transmitter to receiver (by bouncing off buildings, mountains and even passing airplanes); receivers can have trouble sorting all the resulting data out. Orthogonal FDM deals with this multipath problem by splitting carriers into smaller subcarriers, and then broadcasting those simultaneously. This reduces multipath distortion and reduces RF interference allowing for greater throughput. In this paper we have discussed about these two methods of third generation radio transmission system which are WCDMA and OFDM with various aspects. In between these two radio transmission technique, a better choice will be investigated.

  • 2441.
    Christensen, Tina
    et al.
    Blekinge Institute of Technology, School of Management.
    Stankus, Linda
    Blekinge Institute of Technology, School of Management.
    Preferences in e-Commerce Among Men, Women, and Mothers of Young Children in the US2008Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The purpose of our research is to examine differences in e-commerce preferences between men, women, and mothers with small children (in the US). Various website factors have been established in previous studies as critical to e-commerce success. However, there are few studies that investigate how these factors vary in importance among different user groups, for example men, women, or mothers with young children. Increased understanding of these group’s preferences can help companies market themselves more effectively to these groups. A survey was distributed to residents of the US, asking respondents to rank the relative importance of 16 e-commerce features, as well as to provide performance ratings for the implementation of these features by their favorite Internet retailer. The data collected from this survey was analyzed to evaluate significant group differences in their prioritization of importance, as well as perceived performance, of the features and of three constructs (information quality, system quality, and customer-relations quality), which corresponded to more general characteristic groupings of these features. These measures were used to help identify potential performance gaps, which might serve as opportunities for companies to better meet the e-retail expectations of different customer groups. Differences in the importance of features and constructs within each of the groups were consistent with previous studies. A number of gender differences were found in the relative importance of various features, but no gender differences were found at the more general construct level. There were no significant differences in importance values between mothers and non-mothers at either the feature or construct level. However, numerous differences between the groups were found in performance ratings at both feature and construct levels. Most significant was the lower level of satisfaction among mothers, for all features and constructs. Because of a high proportion of respondents listing Amazon.com as favorite e-retailer, separate analyses were performed of these respondents and of the other “non-Amazon” respondents. These analyses showed even greater dissatisfaction among the non-Amazon mothers. In fact, Amazon performance ratings were higher than those of the non-Amazon companies for all constructs and groups, except that IQ performance for women, and especially for non-mothers, was relatively low and of possible concern.

  • 2442.
    Christensson, Ylva
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Wickström, Emelie
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Upplevelsen av återhämtning efter en kranskärlsoperation: En litteraturstudie2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Bakgrund: Hjärt-kärlsjukdom är globalt sett, den dominerande orsaken till mortalitet. Tack vare de allt mer utvecklade behandlingsmetoderna, är det idag fler som överlever. En av dessa behandlingsmetoder är kranskärlsoperation, vilken är nödvändig vid förekomst av komplicerad kranskärlssjukdom. Det är en omfattande operation som kan resultera i såväl fysiska som psykiska konsekvenser för en individ. För att sjuksköterskan ska förstå individens upplevelse av återhämtningsprocessen, krävs god kunskap om operationens innebörd och likaså förståelse för vilka faktorer som spelar in under återhämtningsprocessen.

    Syfte: Syftet med denna studie var, att beskriva individers upplevelse av återhämtning efter en kranskärlsoperation.

    Metod: För att besvara studiens syfte, har en litteraturstudie med kvalitativ design använts. Studien är baserad på 13 vetenskapliga artiklar, som har sökts fram i databaserna Cinahl och PubMed. Artiklarna analyserades utifrån Graneheim och Lundmans tolkning av kvalitativ innehållsanalys. 

    Resultat: Resultatet visade att olika upplevelser under återhämtningsprocessen kan påverka individerna. Ur analysen framkom tre kategorier som visade hur återhämtningsprocessen kunde upplevas. Dessa var begränsningar i vardagen, behovet av stöd och tillbaka till livet.

    Slutsats: Efter en kranskärlsoperation är det många faktorer som påverkar en individs upplevelse av återhämtningsprocessen. Genom en god förståelse av individens situation, tydlig information och praktisk vägledning, kan sjuksköterskan bidra till en gynnsam återhämtningsprocess i individens vardag.  

  • 2443.
    Christiansen, Line
    Blekinge Institute of Technology, Faculty of Health Sciences, Department of Health.
    SJUKSKÖTERSKORS ANVÄNDNING AV IKT I PRIMÄRVÅRDEN: - EN ENKÄTSTUDIE2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: Deficits in communication and information transfer between carelevels at hospital discharge are common and can lead to unnecessary readmissions. There is a great potential of using ICT in health care since it could facilitate faster information transfer between care levels and make the information more consistent and available for follow-up care. However there is still a lacking of knowledge in how much nurses use ICT and the factors that influence its use. Aim: The aim of the study was to describe factors influencing nurses' use of ICT system Prator in primary care and if the use can be related to the perception that ICT contributes to improved coordination in discharges from hospital. Method: A quantitative survey with thirty-seven nurses from eleven medical centers in Southern Sweden who describes their use of the ICT system Prator. Data were statistically analyzed with a descriptive and comparative approach. Results: The results show a significant difference in attitudes between nurses who use Prator and those who did not. Furthermore it shows that only half of the nurses in this study received education about Prator during the implementation. A statistically proven significant were also found in perceptions of using the system. Conclusion: Nurses who use Prator are more positive to the usability of the system and its potential to improve coordination at discharges than those nurses who did not use it. It can therefore be assumed that nurses need to work with the system to be positive about it and see the benefits of it.

  • 2444.
    Christiansen, Line
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Fagerstrom, Cecilia
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Nilsson, Lina
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Nurses' Use and Perception of an Information and Communication Technology System for Improving Coordination During Hospital Discharges A Survey in Swedish Primary Healthcare2017In: Computers, Informatics, Nursing, ISSN 1538-2931, E-ISSN 1538-9774, Vol. 35, no 7, p. 358-363Article in journal (Refereed)
    Abstract [en]

    To facilitate communications between care levels and improve coordination during hospital discharges, there is great potential in using information and communication technology systems, because they can significantly help to deter unnecessary readmissions. However, there is still a lack of knowledge about how often nurses use information and communication technology and the indicators related to its use. The aims of this study were to describe the indicators related to nurses' use of an information and communication technology system for collaboration between care levels and to estimate whether the level of use can be related to nurses' perceptions of the information and communication technology system's contribution to improve coordination during hospital discharges. A quantitative survey of 37 nurses from 11 primary healthcare centers was performed in a county in southern Sweden. The data were analyzed using descriptive and comparative analyses. The results showed that perceptions concerning the information and communication technology system's usability and time consumption differed between nurses who used the system and those who did not. Simultaneously, the nurses were rather unaware of the ability of the information and communication technology system to improve coordination during patient discharges.

  • 2445.
    Christiansen, Line
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Sanmartin Berglund, Johan
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Lindberg, Catharina
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Anderberg, Peter
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Skär, Lisa
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Health-related quality of life and related factors among a sample of older people with cognitive impairment2019In: Nursing Open, E-ISSN 2054-1058, Vol. 6, no 3, p. 849-859Article in journal (Refereed)
    Abstract [en]

    Aim: This study aimed to identify factors affecting health-related quality of life (HRQoL) of older adults with cognitive impairment and to describe the association of these factors with different components of HRQoL. Design: A cross-sectional, descriptive research design was used. Methods: Data were collected from 247 individuals aged 60 years and older from a Swedish longitudinal cohort study. The Short-Form Health Survey-12 (SF-12) and EuroQol (EQ-5D) were used to assess HRQoL. The data were analysed using descriptive and comparative statistics. Results: The present study identified several factors that influenced HRQoL of older adults with cognitive impairment. The results of a multiple logistic regression analysis revealed that the following factors were associated with physical and mental HRQoL: dependency in activities of daily living (ADL), receiving informal care and feelings of loneliness and pain. © 2019 The Authors. Nursing Open published by John Wiley & Sons Ltd.

  • 2446.
    Christiansson, Karin
    et al.
    Blekinge Institute of Technology, School of Health Science.
    Fraude, Marie
    Blekinge Institute of Technology, School of Health Science.
    Ätstörning -”en levande mardröm”- Familjens upplevelser2008Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Bakgrund: Ätstörning bland tonåringar har uppmärksammats allt mer under de senaste decennierna, parallellt med att kunskapen om sjukdomen har ökat. Eftersom sjukdomen drabbar hela familjen är det viktigt att även lägga fokus på familjens upplevelser. Syfte: Studiens syfte var att beskriva familjens upplevelser kring att leva med en tonåring som drabbats av ätstörning. Metod: Metoden som användes var en litteraturstudie, sju vetenskapliga artiklar granskades. Med hjälp av Graneheim & Lundmans analysmetod gjordes en innehållsanalys. Resultat: Resultatet visar att föräldrar till tonåringar med ätstörning upplever stor frustration och maktlöshet i den rådande situationen. Som exempel uttrycker en mamma, att leva med en tonåring med ätstörning är som ”en levande mardröm”. Föräldrarna upplever en känsla av ett splittrat familjeliv samt att syskonen påverkas negativt. Det visar sig att många föräldrar upplever att sjukdomen ”tar över” deras dotter. Föräldrarna är i behov av hjälp, stöd och kunskap om sjukdomen och dess förlopp. Slutsats: Genom att ta del av föräldrarnas upplevelser bidrar detta till en ökad kunskap hos vårdpersonalen, vilket leder till ett mer professionellt och stödjande bemötande.

  • 2447.
    Chrysanthakis, Spyros
    et al.
    Blekinge Institute of Technology, School of Management.
    Morthala, Nancy
    Blekinge Institute of Technology, School of Management.
    Zamani, Tatjana
    Blekinge Institute of Technology, School of Management.
    Valuation of Securities on Inactive Markets2013Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Background: The main topic of the master thesis is Valuation of Securities on Inactive Markets. Securities quoted on inactive market have been investigated to present how their fair value can be efficiently measured. Securities quoted on inactive market can have limited or unreliable inputs and the valuation process can become time and money consuming. Financial professional face similar problems while valuing financial assets on inactive markets. Relevance of the topic: The master thesis might be of particular interest to investment and asset management companies which can get an opportunity to share their experiences and gain from the knowledge exchange. Method: One asset management company and three audit companies have been contacted for collecting information from different perspectives. asset management company has practical experience on conducting valuation of inactively traded securities and audit companies suggest how valuation should be done. Results have been collected through surveys and interviews to all selected companies. Then the qualitative approach has been applied on the collected results. Main findings: Even though most of the answers to the questionnaire were different, as the companies followed generally accepted international standards, their view on the valuation of inactively traded securities was relatively common. Companies admitted that the main problems in the valuation of securities quoted on inactive market are the limited access to market quotes, high spreads on the market, unreliable market information, limited access to financial data of the valued companies and considerable amount of inactively traded securities. Valuation based on multiples is most commonly used by the companies. Sometimes the combination of methods for example price of recent transaction, DCF and net assets can be applied and it is up to the investment manager to decide what methods to use. Summary of recommendations offered by the interviewed companies concerning valuation of inactively traded securities is presented at the end of the master thesis.

  • 2448.
    Chtivelband, Igor
    Blekinge Institute of Technology, School of Computing.
    HistoryLane: Web Browser History Visualization Method2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    With the evolution of Internet, users exploit it increasingly intensively for achieving their goals: sending emails, playing games, watching videos, reading news. They do it through Web browsers, that may vary in exact implementation, but have similar core functionalities . One of these core functionalities is the access to a browsing history. However, as browsing patterns are getting more complex, the traditional history tools become insufficient. Visualization of browsing history might be helpful in that case. In this study we propose a novel approach for browsing history visualization, named HistoryLane, which ts the parallel browsing paradigm, common for modern browsers. The main goal of HistoryLane is enabling the user to gain insight into his own or into other users' parallel browsing patterns over time. Principles of HistoryLane visualization approach are formulated based on recommendations, found during structured literature review. These principles constitute the base for a prototype, which was implemented as a Fire- fox extension. To evaluate the e ffectiveness of HistoryLane we conducted a survey and a quantitative experiment. The results of the evaluation show that HistoryLane is perceived by users as effective and intuitive method for browsing history visualization.

  • 2449.
    Chu, Thi My Chin
    et al.
    Blekinge Institute of Technology, School of Computing.
    Phan, Hoc
    Blekinge Institute of Technology, School of Computing.
    Zepernick, Hans-Jürgen
    Blekinge Institute of Technology, School of Computing.
    MIMO Incremental AF Relay Networks with TAS/MRC and Adaptive Modulation2013Conference paper (Other academic)
    Abstract [en]

    In this paper, we study the use of adaptive modulation (AM) for a dual-hop multiple-input multiple-output (MIMO) network with transmit antenna selection (TAS) at the transmitter and maximal ratio combining (MRC) at the receiver. Our system deploys incremental amplify-and-forward (AF) relaying with AM to forward the source signal. A switching policy for selecting between the relaying and the direct communication is utilized to maximize spectrum efficiency. In particular, we derive closed-form expressions for the outage probability, spectrum efficiency, and bit error rate (BER) for the considered system over Nakagami-m fading. The considered network not only takes advantage of TAS transmission such as achieving full diversity order with low transmit complexity but also inherits the beneficial feature of AM such as spectrum efficiency improvement. Reference

  • 2450.
    Chu, Thi My Chin
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Zepernick, Hans-Jürgen
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    On Capacity of Full-Duplex Cognitive Cooperative Radio Networks with Optimal Power Allocation2017In: 2017 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC), IEEE , 2017Conference paper (Refereed)
    Abstract [en]

    In this paper, we examine a full-duplex transmission scheme for cognitive cooperative radio networks (CCRNs) to improve capacity. In this network, the secondary transmitter and secondary relay are allowed to utilize the licensed spectrum of the primary user by using underlay spectrum access. We assume that the CCRN is subject to the interference power constraint of the primary receiver and maximum transmit power limit of the secondary transmitter and secondary relay. Under these constraints, we propose an optimal power allocation policy for the secondary transmitter and the secondary relay based on average channel state information (CSI) to optimize capacity. Then, we derive an expression for the corresponding achievable capacity of the secondary network over Nakagami-m fading. Numerical results are provided for several scenarios to study the achievable capacity that can be offered by this full-duplex underlay CCRN using the proposed optimal power allocation scheme.

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