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  • 12651.
    Xu, Lingxi
    Blekinge Institute of Technology, School of Planning and Media Design.
    Creating a pleasing outdoor public space of a city2009Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The thesis is a discussion about how to create a pleasing outdoor public space of a city. Besides the general theory study, the author also chooses two city squares from Sweden and China to conduct case studies, and give some improvements to both of them.

  • 12652.
    Xu, Qianxin
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Al-Daghestani, Anas
    AlKassem, Mahinour
    Sustainability-Driven Energy Management Systems for Multinational Organizations: A Case Study2016Independent thesis Advanced level (degree of Master (One Year)), 20 HE creditsStudent thesis
    Abstract [en]

    A vital part of sustainable development and solving the sustainability challenge is to reduce the environmental and social impact of multinational organizations caused by their potentially unsustainable energy consumption.

    The focus of this study is to create an energy management system for organizations to strategically transform their energy resources and energy consumption to reduce their socioecological impact. It is important to ask what are the critical elements that would hinder or allow for the shift to renewable energy and energy efficiency?  It is also important to question how can those elements be integrated together to address the sustainability challenge with the energy consumption of multinational manufacturers?

    A case study on an organization was done to identify some of the barriers and drivers, for them to implement sustainable energy management systems, and to modify the sustainable energy management system that propose strategies around synergy between energy efficiency and renewable energy, to make it a decision-making tool focused on energy planning.

    The construction of the tool, with the help of the case study organization and its decision makers, allowed the design of a more overarching tool that includes sustainability concepts and ensures the sustainability approach in its scheme and implementation

  • 12653.
    Xu, Xiaoji
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Zhi, Huanyu
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Study Of Game Elements Impacting On SE Course Completion Rate In MOOCs2017Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context. SE is a growing field in both academia and industry, online SE education becomes more and more prevalent recent years. Massive Open Online Courses, as an emerging type of open educational resource, provide SE courses a much wider development space. But on the other hand, MOOCs limit SE courses because its low completion rate. Game elements are used to address this issue, but the impact of game elements on completion rate of specific MOOCs and SE courses in MOOCs are not clear. It is necessary to find whether and how game elements could help students finish SE courses. Explore the method and idea of improving SE courses in MOOCs through game elements.

    Objectives. In this study authors investigate what game elements are applied in SE courses in MOOCs platforms, evaluate the impact of MOOCs game elements on SE courses completion situation. Based on the analysis and summary of the data and result, propose suggestion to improve SE courses.

    Methods. Authors conduct a systematic literature to find the game elements used in SE courses in MOOCs. Conducting the survey to get the data of the MOOCs game elements on completion situation in general and data of survey is analyzed by mathematical statistics. The interview is used to find how the game elements of MOOC and SE education simulation impact on learning SE courses on MOOCs by inductive content analysis.

    Results. In systematic literature review, 23 studies are selected from 358 papers of six databases. Forty-one responses of questionnaires are received and twenty interviewees take part in this study. Authors find that game elements have been applied in MOOCs in various ways and research results about effort of game elements are positive. In this study, the results of analyzing the received data in survey show that there is no significant impact of game elements on course completion rate. The interview shows that specific game element is necessary for students finishing their courses and some game elements are not well designed in students’ perspective. Two specific suggestions to improve SE courses are proposed according to survey and interview result.

    Conclusions. This research collects data through SLR, survey and interview, and evaluates the impact of game elements on SE course completion situation through analysis, comparison and summary. The result is helpful to people who design and develop the game elements in MOOCs platform. Focusing on the character of SE education and SE courses, some suggestion of designing and modifying the game elements are provided. This enables the game elements designer to target designing and arranging game elements better.

  • 12654.
    Xue, Ran
    Blekinge Institute of Technology, School of Planning and Media Design.
    Chaotic Identities in Chinese Commercial Streets2013Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    The overall background is the Chinese metropolises like Shanghai and Beijing trying to become part of the modern ones with global and multicultural identities like New York, Tokyo, and London. In the craze for western styles many cities have lose their local cultures, especially notable in the commercial districts of Chinese cities where various themes such as Italian, Russian, and complex styles have become more and more common. In terms of domestic cases, small cities incline to become big cities or well-developed parallel cities and attempt to be urbanized, cultural, and attractive for investors. As a consequence, a mass of pseudo-classic buildings have been or being constructed under the banner of traditional culture. It is a common phenomenon that commercial streets share similar faces and disordered identities in the cities of contemporary China. This thesis investigates why these problems emerged from different aspects - place identity, urban branding, producing and coping spaces from capital perspectives and specific conditions in China. In light of the theoretical study the thesis analyze the findings the case studies of commercial streets in Nanjing and Shanghai in order to find out how the chaotic identities are expressed and what causes to the admiration of western styles are to be found. It also seeks evidence of the rationality of Neo-Chinese style, a new style occurred mostly in residential projects reflecting traditional cultures, and indicates problems that appear during the progress of Neo-Chinese style exploration. The aim of this paper is to give a deeper understanding of the chaotic identities in Chinese commercial streets, and to seek for solutions to the issue.

  • 12655.
    XUE, RUI
    Blekinge Institute of Technology, School of Computing.
    Human Computer Interaction Study: Designing a Mobile Web-based Vaccination Service System Interface for Uganda in Low Resource Settings2013Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Recently, the coverage rating of child vaccination services in developing countries, like Uganda, is lower than developed countries. The low resource setting is the reason that causes the poor vaccination performance. Health workers suffer from the heavy workload, low budget supplement and bad traffic condition, etc. Which constrains the quality of vaccination services. In this thesis, the author designs a mobile web-based vaccination service system, to improve the quality of vaccination service, within the low resource setting. A study in HCI is carried out to design a vaccination service system in the low resource settings of Uganda. Through theoretical study, the author collects the knowledge about how to apply HCI theory to system interface design. A related work study is carried out to help the author to choose the design solution. Through comparing the design with related works, the strength of using the author’s design solution in low resource of Uganda is verified. A field study helps to collect information about the user’s characteristics, which is used for designing a user-friendly system interface. An internal focus group helps to improve the design quality. The author delivers a case study example which could be evaluated and borrowed by other researchers who design a similar system. Additionally, findings from the qualitative research could be used for further research.

  • 12656.
    Yadav, Pavan Kumar
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Interaction and System Design.
    Kalyan, Kosuri Naga Krishna
    Blekinge Institute of Technology, School of Engineering, Department of Interaction and System Design.
    Support for Information Management in Virtual Organizations2006Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Globalization and innovation are revolutionizing the higher education forcing to create new market trends. Different nations have their own pattern and framework of education in delivering the educational services. Educational institutions are also seeking different organizational and behavioural changes for their better future as they hunt for new financial resources, face new competition and seek greater prestige domestically and internationally. The coming future will decide which universities would survive the market trends, competition and expectations of the students (Clients). The survival-of-the-fittest paradigm framework plays a prominent role in ideas of how the higher education would be delivered to the students in future with the Instruction Technology and distance education. According to us the education trend has changed its phase of delivery of services form the management point of view to student’s point of view. Leading to delivery of educational service’s which would have more impact on student’s education, knowledge and experience within the institution. In our thesis we try to provide some information about how to support and manage the information in Virtual Organizations. We also explore the frameworks of the university and discussed a case study about the different ways of providing better support for information management resulting in delivery of best students driven services and unique facilities. We would be looking at the different aspects of the university work flows and procedures and gain an insight on the student’s expectation from the organization. This investigation would be helpful for the students to know what are the services they should expect from the universities and also helpful for management to know better the needs of the students and their needs and to develop a framework for proper execution of these services.

  • 12657.
    Yagci, Arda
    Blekinge Institute of Technology, School of Computing.
    Comparison and Evaluation of Routing Mechanisms for Wi-Fi Mesh Networks2011Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Wireless mesh networks are communication networks possessing radio nodes with mesh organization structure. They are expected to be widely employed by personal, local, campus and metropolitan area applications. Most of the needed components for the deployment of WMNs; such as ad-hoc network routing protocols, wireless security protocols, IEEE 802.11 MAC protocol are already available, while there are problems sourced from various protocol layers. These problems restrict WMNs from serving their potential. The purpose of this work is to evaluate the WMN routing mechanisms with respect to several performance indicators and to determine the routing protocols, which maintain scalable, robust and efficient operation. The performance of B.A.T.M.A.N (Better Approach to Mobile Ad-hoc Networking) protocol is compared to conventional AODV and OLSR protocols in addition to an experimental wireless MPLS routing mechanism (LWMPLS). The OMNeT++ simulation environment helps to determine the performance of routing mechanisms throughout our tests. The simulation results point out that B.A.T.M.A.N protocol performs stable routing in networks with varying link qualities or failing nodes. It has low packet loss rate even when it is employed in environments with extremely high thermal noise, therefore B.A.T.M.A.N is foreseen to become one of the most popular routing mechanisms of WMNs.

  • 12658.
    YAGCI, Mehmet Yalcin
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Sound Phase Change over Barriers2009Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Noise Barriers are used for cancellation of sound from roads. Sound of different frequencies travel differently over the top of the barriers. Design of barriers differ. Sound phase change can play an important role in noise cancellation. The aim of this thesis is to simulate the source, noise barrier, receiver environment by software and investigate the sound phase change for different designs of the top of noise barriers. Linear Acoustics and Wave Theory is used for wave propagation.

  • 12659.
    YAHAYA, ABU
    Blekinge Institute of Technology, School of Management.
    USING THE BALANCED SCORECARD TO ACCESS PERFORMANCE OF BANKS IN GHANA2009Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    ABSTRACT Title: Using Balanced Scorecard to assess performance of banks in Ghana Author: Abu Yahaya Supervisor: Eva Lovstal Department: School of Management, Blekinge Institute of Technology Course: Master’s thesis in Business Administration, 15 credits (ECTS). Background and Problem Discussion: The effect of non-financial variables on the financial performance of banks in Ghana can become significant. The information of how customer satisfaction, internal business processes, organizational learning and growth influences financial indicators is therefore of great importance in assessing performance of banks in Ghana. Purpose: The purpose of this thesis is to create a model to be able to assess performance of banks in several dimensions and measures using the Balanced Scorecard framework. Method: Quantitative and inductive methods. Primary data is financial and non-financial statistics collected from public institutions and sources, staffs and customers of Barclays Bank Ghana limited, Ecobank Ghana Limited and United Bank for Africa (Ghana) Limited. Theory: The theory section looks at different concepts and relevant theories that come up when analyzing bank’s financial results and how they are being impacted by other non-financial perspectives. I have therefore chosen the most common concept for the theory section. Analysis: I have used a model to examine how the balanced scorecard can be used to assess performance of banks in several dimensions and measures in order to provide additional information to all stakeholders - internally and externally. The chosen scenario shall then be used to determine if BSC can provide additional information with respect to the performance of the selected banks. Conclusion: The analyzed banks showed only marginally the impact of non-financial perspectives on financial performance. Analysis also showed that in assessing performance of banks some critical non-financial factors such as customer satisfaction, efficient internal processes and the quality of staff play a crucial role. Of specific interest is the turn-around-time on loan processing and disbursement which is a core function of the banks and for which all the selected banks failed to adequately address. But the study also revealed that the BSC framework indeed provides additional information when used to assess the performance of banks in Ghana.

  • 12660.
    Yamben, Jean-Yves
    Blekinge Institute of Technology, School of Engineering, Department of Interaction and System Design.
    Intelligent decision support system for transport infrastructure investment with emphasis on joint logistic2007Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The aim of this thesis is to provide to the governmental decision-maker/user, an instrument that can assist him/her in improving the infrastructure investment decision in the economical, environmental and sustainable aspects. This means that, the Return on Investment (ROI) of the concerned transport infrastructure, satisfying environmental and sustainable constraints must be positive, and corresponding to an optimal investment cost. The decision support system can be applied in two dimensions. One dimension is where the real negotiation process is occurring between private and public stakeholders, called “real time negotiation process”. The second dimension is where the negotiation process is impelled by the user (public part) without private stakeholders interaction (but with interaction through simulation), called “virtual negotiation process”. The simulation and local optimization techniques, in phase with agent technology, used in the “virtual negotiation process” enable us to achieve a certain amount of alternative decisions to the primary/suggested decision to be evaluated. The CommonKADS methodology with mathematical modeling, and agent technology have been the support respectively for extracting and implementing the knowledge in the domain, monitoring, automating and updating the decision process. The principle of “Joint logistic” [1] in my effort concerns by the means of sharing financial and information resources; This leads to the empowerment of the supply chain feedbacks (roles), involved in the earlier stages of public transport decision making-process. It appears that within the decision-making process, the government is often dealing with the conflicting objectives, while interacting with the business stakeholders. For instance, the estimated investment cost of a specific transport infrastructure can exceed the income generated by this infrastructure, thus the ROI of the concerned transport infrastructure (TI) will be negative. From this perspective the government faces three choices: a) increase the rate of the taxes applied on that transport infrastructure or any other taxes, in order to make ROI positive, this can be matter of discussion/disagreement for the business community b) reduce the investment cost which means suggest a different TI with a lower quality standard compared to the previous; this can also be a matter of disagreement between the two concerned stakeholders. c) delay of the investment in the specific transport infrastructure. In fact in the most situations the government uses the first approach, which effects might be consequently unpredictable and disastrous in the economical and environmental sense for the government. From this point of view my attempt is to propose an intelligent decision support system for governments or project groups (e.g. East West project group), involving conceptually as components web portal, database, simulator and knowledge base, that bases on an approach, that enables this negotiation/information exchange at the earlier steps of decision-making situation. This is concretized by gathering in real time accurate and relevant information from the private sector; furthermore the knowledgebase of the designed system is conceived via the experience and historical knowledge of the concerned experts in the domain.

  • 12661.
    Yan, Guoning
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Zhan, Wenkai
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Testing of mobile applications. A review of industry practices2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context. With the rapid development of mobile devices, mobile applications have occupied an increasingly large market. Software testing is an important factor in ensuring software quality [59]. In order to develop high-quality mobile applications, software companies are increasingly paying attention to mobile application testing. We found that there are relatively few studies on mobile application testing methods and tools in the real industry, and this direction of research has been very helpful for some software companies' mobile application testing, so we chose this direction for exploratory research.

    Objectives. The purpose of our research is to investigate the software company's field of mobile application testing. We mainly study the methods and tools of mobile application testing that are now popular in enterprises, the challenges faced by mobile application testing in software companies and how they solve challenges.

    Method. We used two methods to answer our research questions. We chose literature review and survey as research methods. The literature review method gives us an insight into the areas of expertise and mobile testing. Survey is used to answer our research questions. Our data collection method is the questionnaire survey method. When we completed the data collection, we performed statistics and analysis on the data and answered our research questions.

    Result. Through the literature review method, we summarize the methods and tools for mobile application testing in the literature. By sending 46 surveys to different software companies, we analyzed and analyzed the methods and tools for mobile application testing that are popular in the enterprise and the reasons for choosing these methods. We also listed the company's mobile application testing. Challenges and solutions encountered.

    Conclusions. We answered all the research questions. We analyzed the feedback from 46 questionnaires and got information about mobile application testing. We read a lot of literature and summarized the relevant conclusions in the literature. Our findings can help people in related fields, and we can provide them with 46 data and analysis results. We can also provide mobile application methods and tools that are popular among readers in the enterprise.

  • 12662. Yan, Mao
    et al.
    Chen, Qingchun
    Lei, Xianfu
    Duong, Quang Trung
    Blekinge Institute of Technology, School of Computing.
    Fan, Pingzhi
    Outage Probability of Switch and Stay Combining in Two-Way Amplify-and-Forward Relay Networks2012In: IEEE Wireless Communications Letters, ISSN 2162-2337, E-ISSN 2162-2345, Vol. 1, no 4, p. 296-299Article in journal (Refereed)
    Abstract [en]

    In this letter, a switch-and-stay combining (SSC) in two-way amplify-and-forward (AF) networks with two relays is proposed and analyzed. In particular, the closed-form expression of the outage probability for the proposed scheme over Rayleigh fading channels is derived. Asymptotic performance analysis for high signal-to-noise ratio (SNR) is also presented. It is shown that the SSC scheme is capable of realizing full diversity order, and even achieving the same outage performance as the best-relay selection (BRS), when reasonable switching thresholds are set. Simulations are provided to corroborate the theoretical analysis.

  • 12663.
    Yan, Zifei
    Blekinge Institute of Technology, School of Engineering.
    Equivalence Transformations for a System of a Biological Reaction Diffusion Model2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    A biological reaction diusion model has gained much attention recently. This model is formulated as a system of nonlinear partial dierential equations that contains an unknown function of one dependent variable. How to determine this unknown function is complicated but also useful. This model is considered in this master thesis. The generators of the equivalence groups and invariant solutions are calculated.

  • 12664.
    Yan, Zuohai
    et al.
    Blekinge Institute of Technology, School of Engineering.
    Zhao, Shuqi
    Blekinge Institute of Technology, School of Engineering.
    Road Condition Predicting with Kalman Filter for Magneto-Rheological Damper in Suspension System2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    This thesis develops a new way to predict the road roughness with Kalman filter. It suggests applying the Kalman filter to predict road condition in suspension system. According to the literature review and to the knowledge of authors, no similar applications of Kalman filter in predicting the road roughness are found at the time of the writing thesis. Most of the prediction nowadays is around the road prediction with GPS. It concentrates on avoiding the road bumps by the operator. This research is brand new in this field. What the authors focus on is to predict the road condition and to pass this information to the control system. By this way, the passenger comfort is improved. This research is practical in transportation industry. Nowadays the passenger comfort is crucial. This road condition predictor can help the vehicle to improve the passenger comfort. Furthermore, this predictor can be adjusted to different road conditions. A suspension system is important to improve passenger comfort. Magneto-Rheological(MR) damper, which is a controllable damper, can improve the performance of the suspension system. This thesis presents a menthod to predict the road condition for MR damper. Firstly, three suspension systems, passive, active and semi-active suspension systems, are evaluated by their costs and performances. The semi-active suspension system has good performance with low cost. This suspension system shows better performance with proper control strategy. Additionally, two different levels of road roughness are simulated by Harmonic superposition method in time domain. One of the road roughness scenarios is chosen to test the prediction method. The road roughness is predicted by a Kalman filter. The result shows that the Kalman filter can estimate the road condition with a high accuracy. The prediction frequency is high in this method. The control strategy can adjust its coefficient based on the high prediction frequency. Thus, the performance of the suspension system is enhanced and the passenger comfort is also improved.

  • 12665. Yang, Geng
    et al.
    Li, Xie
    Mäntysalo, Matti
    Zhou, Xiaolin
    Pang, Zhibo
    Xu, Li Da
    Kao-Walter, Sharon
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Chen, Qiang
    Zheng, Lirong
    A Health-IoT Platform Based on the Integration of Intelligent Packaging, Unobtrusive Bio-Sensor and Intelligent Medicine Box2014In: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 10, no 4, p. 2180-2191Article in journal (Refereed)
    Abstract [en]

    In-home healthcare services based on the Internet-of-Things (IoT) have great business potential; however, a comprehensive platform is still missing. In this paper, an intelligent home-based platform, the iHome Health-IoT, is proposed and implemented. In particular, the platform involves 1) an open-platform-based intelligent medicine box (iMedBox) with enhanced connectivity and interchangeability for the integration of devices and services, 2) intelligent pharmaceutical packaging (iMedPack) with communication capability enabled by passive radio-frequency identification (RFID) and actuation capability enabled by functional materials, and 3) flexible and wearable bio-medical sensor device (Bio-Patch) enabled by the state-of-the-art inkjet printing technology and system-on-chip. The proposed platform seamlessly fuses IoT devices (e.g., wearable sensors, intelligent medicine packages, etc.) with in-home healthcare services (e.g., telemedicine) for an improved user experience and service efficiency. The feasibility of the implemented iHome Health-IoT platform has been proven in field trials.

  • 12666. Yang, Jing
    et al.
    Fan, Pingzhi
    Duong, Quang Trung
    Lei, Xianfu
    Exact Performance of Two-Way AF Relaying in Nakagami-m Fading Environment2011In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 10, no 3, p. 980-987Article in journal (Refereed)
    Abstract [en]

    The performance of two-way amplify-and-forward (AF) relaying networks over independently but not necessarily identically distributed (i.n.i.d.) Nakagami-m fading channels, with integer and integer plus one-half values of fading parameter m, is studied. Closed-form expressions for the cumulative distribution function (CDF), probability density function (PDF), and moment generating function (MGF) of the end-to-end signal-to-noise ratio (SNR) are presented. Utilizing these results, we analyze the performance of two-way AF relaying system in terms of outage probability, average symbol error rate (SER), and average sum-rate. Simulations are performed to verify the correctness of our theoretical analysis.

  • 12667. Yang, Kai
    et al.
    Mfoumou, Etienne
    Kao-Walter, Sharon
    Chi, Yilin
    Experimental Study of Packaging Materials Based on Acoustic Measurements Combined with Tensile Tests2009Report (Other academic)
    Abstract [en]

    In this report, we investigated the variation between tension and fundamental frequency with respect to time, and at a constant strain rate. This was done for rectangular thin sheets under uniaxial tensile test and transverse vibration. Thin Paper (PPR), Low Density Polyethylene (LDPE) and laminate (PPR/LDPE/Al-foil) sheets were analyzed both within the elastic and plastic (which was investigated in this work) regions. The emphasis is on the linear relationship between the resonance frequency (in square) and the load.

  • 12668.
    Yang, Kaiyuan
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Wang, Fuliang
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    The Implementation of A Fingerprint Enhancement System Based on GPU via CUDA2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In order to reduce the large execution time of an existing fingerprint enhancement system, a parallel implementation method based on GPU via CUDA is proposed. Firstly, the necessity and feasibility of employing parallel programming for the whole system are analyzed. Then pre-processing, global analysis, local analysis and matched filtering of the whole fingerprint enhancement system is designed, optimized and implemented respectively using parallel computing technology via CUDA. Finally, numerous fingerprints from FVC2000 databases are tested and the  obtained execution time is compared with that of the CPU based system. The results show that the execution time is significantly reduced by using the parallel implementation method based on GPU. 

  • 12669.
    Yang, Kuankuan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Cai, Ye
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Critical success factors for conducting Software Process Improvement in Very Small Entities2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background. It is significant to constantly change and improve the software process to thrive in the software market with rapidly changing requirement and situation. However, very small entities(VSEs) have difficulties to adopt software process improvement that have played an important role in software market, because they usually have some unique characteristics, such as informal and fewer documents, tight budget, and less human resources. Therefore, we believe it is necessary to study factors that are crucial to successful conducting SPI, to help inexperienced VSEs with limited resource implement SPI with reasonable cost.

    Objectives. The overall aim of our research is to analyse critical success factors about successfully conduct software process improvement for Very Small Entities. The objectives are based on the aim as following: 1) Identifying the special characteristics of VSEs which related to conducting SPI, 2) Identifying the state-of-the-art critical success factors when VSEs conducting SPI both in literature and practice: verifying and prioritizing the factors, and 3) Investigating the strategies that VSEs can take in order to successfully implement SPI.

    Methods. In order to investigate the critical factors and barriers need to focus and avoid during the improvement, we implemented a systematic literature review as the first phase. Then a survey questionnaire as the second phase to validate the results gained from the systematic literature review through consulting industrial software engineers.

    Results. The final result includes 80 success factors which have been mentioned at least once in the primary studies, a few characteristics of VSEs and strategies for SPI in VSEs. Among the 80 factors, we chose 29 factors as CSFs that were mentioned more than three times, then selected the first 15 CSFs as survey questions material. Through the survey, we gathered the evaluation of all factors from two areas and some suggestion or opinion of SPI in VSEs, explained the 29 CSFs and two ranking tables about top factors from the SLR and the survey, discussed 14 CSFs from both ranking tables, then provided specific strategies for each of the common 8 factors. Conclusions. For helping VSEs that intend to conduct SPI with limited resources, we answered our research questions through SLR and Survey, found 29 state-of-the-art success factors of SPI in VSEs, ranked 15 of them and provided a description, discussion, and strategies. Selected and prioritised success factors would be supportive for VSEs to ration their budget. Furthermore, we hope we can inspire VSEs who are having trouble to implement SPI by providing strategies.

  • 12670.
    YANG, MO
    et al.
    Blekinge Institute of Technology, School of Engineering.
    XU, YAOCHEN
    Blekinge Institute of Technology, School of Engineering.
    Structure Design and Simulation of Titanium Engine Piston Based on Thermal-Mechanical Coupling Model2013Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    Piston is the ‘heart’ of the automobile engine. It’s one of the key components of the engine and it’s working the hard condition which accelerated the piston wear and broken. A good design of the piston in this thesis is compared with existing piston to extend the Mean Time Between Maintenance. In order to achieve the deformation, thermal and stress distribution of the piston, ANASYS software is used to analyze the piston under the thermal loads and mechanical loads. The results are shown that the temperature distribution occurs on the top of the piston when the piston under the thermal load and the greatest stress occurs on the piston pin when the piston under the thermal-structure coupling. The temperature distribution is conformed to the facts, but the greatest stress is a bit large when coupling.

  • 12671.
    Yang, Peng
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Investigating aluminum plate with different geometrical shape by using DIC tension test2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This subject mainly uses Aluminum sheet metal material as the research object which is used in Volvo XC90 door, the elastic plasticity deformation within the different material angles and notch shape investigated with MTS tensile test equipment under uniaxial tension. The local strain curve studied by using DIC method to obtain the conventional physical quantity. Combining ABAQUS to analyze the distribution of stress in elastic and plastic regions, also use MATLAB to combine various parameters, and finally analyze the desired experimental results to find a relatively stable notch shape based on the yield curve and stress concentration factor.

  • 12672.
    Yang, Qing
    Blekinge Institute of Technology, School of Planning and Media Design.
    Lively Streets and Better Social Life2012Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    For much of the twentieth century, streets were designed to accommodate the ever increasing traffic flow, but it has become apparent that streets have many social and recreational functions which are severely impaired by fast car traffic. There is plenty of research on conditions for non-motorized transport and development of design measures on the streetscape to protect pedestrians and cyclists, but how places are made in the street is less studied and seldom implemented. In order to create more humanistic space in the street, we need to take consideration of people first, figure out how space can turn into a good place and which physical conditions will improve social life. This paper starts with pointing out the problems of ignoring social life in urban streets, and investigating the main theories and applications in contemporary western countries. After that, the thesis introduces literature on improving street life, including the books of Gehl: Cities for People (2010), New City Life (2006), and Burton and Mitchell: Inclusive Urban Design - Streets for life (2006), etc. Moreover, to see how these theories can be applied on a specific case, three streets in the town of Kristianstad are studied. This thesis is conducting an investigation on characteristics of these streets, observing social life in each street, and trying to figure out under which conditions does a street change from subduing social life to enhancing it. The theoretical tools and observation results of social life are all taken into the case study for practice, aiming at creating lively streets. My conclusions concern the primary factors for creating lively streets: location and role of the comparable streets in the overall traffic network, the characteristics of these streets and adjacent buildings, and the relationships between the physical conditions and the observed social life.

  • 12673.
    Yang, Shun
    Blekinge Institute of Technology, School of Engineering.
    Modelling and control of a Buck converter2011Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    DC/DC buck converters are cascaded in order to generate proper load voltages. Rectified line voltage is normally converted to 48V, which then, by a bus voltage regulating converter also called the line conditioner converter, is converted to the bus voltage, e.g. 12V. A polynomial controller converter transforms the 12V into to a suitable load voltage, a fraction of or some few voltages. All cascaded converters are individually controlled in order to keep the output voltage stable constant. In this presentation focusing on the polynomial controller converter implemented as Ericsson’s buck converter BMR450. In this paper modeling, discretization and control of a simple Buck converter is presented. For the given DC-DC-Converter-Ericsson BMR 450 series, analyzing the disturbance properties of a second order buck converter controllers by a polynomial controller. The project is performed in Matlab and Simulink. The controller properties are evaluated for measurement noise, EMC noise and for parameter changes.

  • 12674.
    Yang, Xin Yu
    Blekinge Institute of Technology, School of Engineering.
    When Computers Can Discuss Shape Properties with Each Other2011Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    A novel idea for perception of object surfaces is presented by so called "shape descriptors". Such idea is as an abstract level to represent the object surface by some real numbers. It has the similar idea like as the Fourier coefficients of mapping a function f(x) to frequency domain by Fourier transform. The main goal of this thesis is to define some of the key issues in understanding of an object shape and also to find a modeling methodology to create the "shape descriptors". The modeling methodology is designed based on a variational interpolation technique. Such technique is used to generate a group of variational implicit functions with help of radial basis functions. In our modeling methodology, we randomly choose some reference points on a set of related concentric spheres around a 3D point cloud data as known values in variational implicit functions. The "shape descriptors" are found from these implicit functions implementing LU decomposition. We show that the "shape descriptors" are invariant to size and positioning (rotation and translation) changes of a shape and they are also effective tools for matching of two similar objects surfaces.

  • 12675. Yang, Yi
    et al.
    Hwang, Sheue Ling
    Schenkman, Bo
    Blekinge Institute of Technology, School of Management.
    An improved Web search engine for visually impaired users2012In: Universal Access in the Information Society, ISSN 1615-5289, Vol. 11, no 2, p. 113-124Article in journal (Refereed)
    Abstract [en]

    The Google search engine was studied as a Web prototype to be modified and improved for blind users. A Specialized Search Engine for the Blind (SSEB) was developed with an accessible interface and improved functions (searching assistance functions, user-centered functions, and specialized design for the blind). An experiment was conducted with twelve participants, both blind and sighted, to verify the effects of SSEB. The performance was better with the SSEB than with the Google search engine, and the participants also showed higher satisfactions with the SSEB. Interface considerations for designing an accessible Web site for blind users are important. The users of SSEB could in the future be expanded to include most, if not all, visually impaired people, since the World Wide Web and all Internet resources should ideally be accessible to everyone.

  • 12676.
    Yang, Zhe
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Coexistence, Deployment and Business Models of Heterogeneous Wireless Systems Incorporating High Altitude Platforms2013Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The increased demand for broadband communications has led to the rapid development of the conventional terrestrial and satellite wireless communications systems. One of the main challenges to next generation wireless systems is to deliver high-capacity and cost-efficient solutions to cope with an increasing usage of broadband services and applications. In the recent years, an emerging competitive system has attracted the attention for providing wireless broadband communications and other services based on quasi-stationary aerial platforms operating in the stratosphere known by high altitude platforms (HAPs), and located 17-22 km above the earth surface. This solution has been described by the International Telecommunication Union (ITU) as "a new and long anticipated technology that can revolutionize the telecommunication industry''. The HAP systems provide important advantages such as low cost, high elevation angles, low propagation delay, easy and incremental deployment, flexibility in operation, broad coverage, broadcast and broadband capability, ability to move around in emergency situations, etc. Therefore, they have been proposed by ITU for the provision of fixed, mobile services and applications, e.g. the third generation (3G) services licensed by ITU and backbone link for terrestrial networks in remote areas. This thesis explores and investigates the wireless communication and techno-economic performance of terrestrial systems and HAPs. An overview of research and development on aerial platforms worldwide is given. Coexistence performance and techniques of heterogeneous systems to provide broadband wireless communications based on Worldwide Interoperability Microwave Access (WiMAX) are investigated. A heterogeneous scenario is developed to examine the coexistence performance of heterogeneous systems. The capacity and deployment aspects of HAPs are analyzed, and further compared with terrestrial Universal Mobile Telecommunications Systems (UMTS) through techno-economic studies including a proposed partnership based business model for HAPs. Performance of wireless sensor network applications via HAPs is also investigated, and shows the high potential of HAPs for large-area and long-endurance surveillance and emergency applications. The thesis shows that communications from the aerial platforms provide the best features of both terrestrial and satellite systems. HAPs can effectively coexist in a heterogeneous radio environment, and are competitive solutions in urban and suburban scenarios in terms of capacity, coverage and business perspective. This makes HAP a viable competitor and complement to conventional terrestrial infrastructures and satellite systems.

  • 12677. Yang, Zhe
    et al.
    Grace, David
    Mohammed, Abbas
    Optimizing Antenna Performance for Improving Coexistence Performance of Providing WiMAX Servicefrom High Altitude Platforms and Terrestrial WiMAX Deployments2006Conference paper (Refereed)
  • 12678. Yang, Zhe
    et al.
    Kamit, Saltanat
    Mohammed, Abbas
    Larson, Peter
    An Investigation of the Business Model in Karlskrona Municipal Wireless Network in Sweden2008Conference paper (Refereed)
    Abstract [en]

    In this paper, an investigation on an emerging operational "business model" for the municipal wireless network in the city of Karlskrona in Sweden is explored. We inquire into the association between of different actors involved in the business model implemented by Karlskrona municipality in our selected case study, and identify a number of key considerations in the business model and wireless city services for municipality when it is initializing and deploying the municipal wireless network as a business driven and public-utility driven service.

  • 12679. Yang, Zhe
    et al.
    Mohammed, Abbas
    A Comparative Study on Business Models of Municipal Wireless Cities in US and Sweden2008Conference paper (Refereed)
    Abstract [en]

    In this paper, we will explore the existing operational "business models" for municipal wireless networks in US and Sweden. Based on the current paradigms of the North-American public wireless networks, we will investigate an emerging wireless city concept in Sweden to analysis this new business concept in the existing field. We will look into the relationship of different actors in various business models of the wireless cities in our selected case studies. This paper will aim to demonstrate a number of key considerations when designing and managing the business model of Municipal wireless networks as business-driven and public utility-driven services.

  • 12680. Yang, Zhe
    et al.
    Mohammed, Abbas
    A Study of Multiple Access Schemes for Wireless Sensor Network Applications via High Altitude Systems2009Conference paper (Refereed)
    Abstract [en]

    In this paper, we investigate the performance of a multiple access scheme based on orthogonal frequency-division multiplexing (OFDM) in High Altitude Platform (HAP) system for Wireless Sensor Network (WSN) applications. In our study, HAPs are used to replace the traditional gateway deployed on the ground and collect data from sensor nodes. Two scenarios of OFDM schemes with different subcarrier spacing are simulated in Rayleigh and Ricean fading environment. Results show the multiple access scheme based on OFDM for WSN can improve the performance against multipath transmission.

  • 12681. Yang, Zhe
    et al.
    Mohammed, Abbas
    A Study of Multiple Access Schemes for Wireless Sensor Network Applications via High Altitude Systems2009Conference paper (Other academic)
  • 12682. Yang, Zhe
    et al.
    Mohammed, Abbas
    Broadband Communication Services from Platform and Business Model Design2008Conference paper (Refereed)
  • 12683. Yang, Zhe
    et al.
    Mohammed, Abbas
    Business model design for capacity-driven services from High Altitude Platforms2008Conference paper (Refereed)
    Abstract [en]

    In this paper, we will discuss the business model design for the deployment of capacity-driven services from High Altitude Platforms (HAPs). Key factors of successfully delivering the HAP services will be investigated in terms of coexisting with current major wireless broadband and cellular network operators in a long term perspective. A partnership-based business model will be proposed and demonstrated to be effective. We will mainly concentrate on describing how HAP wireless network operator could establish its network and cooperate with other actors being in the proposed business model.

  • 12684. Yang, Zhe
    et al.
    Mohammed, Abbas
    Coexistence Performance Evaluation of WiMAX Uplink Broadband Services via High Altitude Platforms2008Conference paper (Refereed)
  • 12685. Yang, Zhe
    et al.
    Mohammed, Abbas
    Deployment and Capacity of Mobile WiMAX from High Altitude Platform2011Conference paper (Refereed)
    Abstract [en]

    In this paper, we investigate the deployment and capacity of delivering mobile WiMAX based on IEEE 802.16e-2005 from aerial platform such as High Altitude Platforms (HAPs). A urban scenario and an suburban scenario with mobile broadband usages as complement or substitute to the fixed Internet connection are developed to compare the delivery of broadband services from terrestrial and aerial platforms. A deployment strategy is based on maximizing and meeting the networking traffic demand and coverage area. In the end, a comparison based on cell radii and capacities between services from aerial platforms and existing terrestrial based solutions, such as universal mobile telecommunications system (UMTS) and high speed packet access (HSPA) is proposed. Currently, most research has been done to develop advanced technologies to enhance standards to support a higher data rate in a cost-effective way for wireless communication systems. From analysis and investigation, aerial platform can provide a cost-effective solution for a large area with a medium to high traffic demand.

  • 12686. Yang, Zhe
    et al.
    Mohammed, Abbas
    Evaluation of WiMAX Uplink Performance in High Altitude Platforms Cellular System2007Conference paper (Refereed)
  • 12687. Yang, Zhe
    et al.
    Mohammed, Abbas
    Evaluation of WiMAX Uplink Performance in High Altitude Platforms Cellular System2008Conference paper (Refereed)
  • 12688. Yang, Zhe
    et al.
    Mohammed, Abbas
    High Altitude Platforms for Sensor Network Applications2009Conference paper (Refereed)
  • 12689. Yang, Zhe
    et al.
    Mohammed, Abbas
    High Altitude Platforms for Wireless Sensor Applications2009Conference paper (Other academic)
  • 12690. Yang, Zhe
    et al.
    Mohammed, Abbas
    High Altitude Platforms for Wireless Sensor Network Applications2008Conference paper (Refereed)
  • 12691. Yang, Zhe
    et al.
    Mohammed, Abbas
    On the Cost-Effective Wireless Broadband Service Delivery from High Altitude Platforms with an Economical Business Model Design2008Conference paper (Refereed)
  • 12692. Yang, Zhe
    et al.
    Mohammed, Abbas
    Wireless Broadband Access and Applications from High Altitude Platforms2008Conference paper (Refereed)
    Abstract [en]

    In this paper, we give an overview of using High Altitude Platforms (HAPs) for providing wireless telecommunication and broadband communication services. Comparisons of HAPs, satellite and terrestrial systems are shown to illustrate unique characteristics of the system. Three architectures for HAP systems are discussed in terms of cooperation with terrestrial and satellite systems. Telecommunication, broadband and disaster applications of HAPs are showed based on system scenarios.

  • 12693. Yang, Zhe
    et al.
    Mohammed, Abbas
    Wireless Broadband Services for Suburban and Rural Applications from High Altitude Platforms with an Economical Business Model Design2008Conference paper (Refereed)
  • 12694. Yang, Zhe
    et al.
    Mohammed, Abbas
    Wireless communications from high altitude platforms: Applications, deployment and development2010Conference paper (Refereed)
    Abstract [en]

    In this paper, an overview of the HAP concept development and HAP trails is introduced to show the worldwide interest and development in the emerging novel technology. A comparison of the HAP, terrestrial and satellite system characteristics is given. Main advantages of HAPs for wireless communication applications are large coverage area, high capacity and cost-effective deployment. Three applicable scenarios of HAP communication are shown.

  • 12695. Yang, Zhe
    et al.
    Mohammed, Abbas
    Awoniyi, Oluwaseyi
    Oladipo, Andrew Oluseyi
    Hult, Tommy
    Salomonsson, Maria
    Comparative Analysis of Channel Models for Stratospheric Propagation2007Conference paper (Refereed)
  • 12696. Yang, Zhe
    et al.
    Mohammed, Abbas
    Grace, David
    Optimizing Download Coexistence Performance of Providing WiMAX Service from HAPS and Terrestrial Deployment2006Conference paper (Refereed)
  • 12697. Yang, Zhe
    et al.
    Mohammed, Abbas
    Hult, Tommy
    Modelling and Optimizing Downlink Coexistence Performance of WiMAX Services in HAP and Terrestrial Deployments in Shared Frequency Bands2007Conference paper (Refereed)
  • 12698. Yang, Zhe
    et al.
    Mohammed, Abbas
    Hult, Tommy
    Performance Evaluation of WiMAX Broadband from High Altitude Platform Cellular System and Terrestrial Coexistence Capability2008In: EURASIP Journal on Wireless Communications and Networking, ISSN 1687-1472, E-ISSN 1687-1499, Vol. 2008Article in journal (Refereed)
    Abstract [en]

    The performance obtained from providing worldwide interoperability for microwave access (WiMAX) from high altitude platforms (HAPs) with multiple antenna payloads is investigated, and the coexistence capability with multiple-operator terrestrial WiMAX deployments is examined. A scenario composed of a single HAP and coexisting multiple terrestrial WiMAX base stations deployed inside the HAP coverage area (with radius of 30 km) to provide services to fixed users with the antenna mounted on the roof with a directive antenna to receive signals from HAPs is proposed. A HAP cellular configuration with different possible reuse patterns is established. The coexistence performance is assessed in terms of HAP downlink and uplink performance, interfered by terrestrial WiMAX deployment. Simulation results show that it is effective to deliver WiMAX via HAPs and share the spectrum with terrestrial systems.

  • 12699. Yang, Zhe
    et al.
    Mohammed, Abbas
    Hult, Tommy
    Uplink Performance Evaluation of WiMAX Broadband Services via High Altitude Platforms (HAPs)2007Conference paper (Refereed)
  • 12700. Yang, Zhe
    et al.
    Mohammed, Abbas
    Hult, Tommy
    Grace, David
    Assessment of Coexistence Performance for WiMAX Broadband in High Altitude Platform Cellular System and Multiple-Operator Terrestrial Deployments2007Conference paper (Refereed)
    Abstract [en]

    In this paper, performance of providing WiMAX from High Altitude Platforms (HAPs) with multiple antenna payload will be investigated as well as considering the coexistence capability with multiple-operator terrestrial deployments. A scenario of a HAP and terrestrial WiMAX base stations deployed inside a HAP coverage area with a radius at 30 km will be proposed. HAP cellular formation with different reuse patterns will be established. Coexistence performance will be assessed in terms of HAP downlink signal interfered by terrestrial WiMAX deployment. This paper will show it is effective to deliver WiMAX via HAPs and can efficiently share the spectrum with terrestrial WiMAX systems.

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