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  • 13351.
    Åhman, Robin
    et al.
    Blekinge Institute of Technology, School of Planning and Media Design.
    Bergsmo, Thobias
    Blekinge Institute of Technology, School of Planning and Media Design.
    Emotionell Marknadsföring på lång och kort sikt2013Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Målet med denna undersökning och uppsats är att klargöra vilka aspekter som är viktiga inom emotionell marknadsföring. Uppsatsen ämnar klargöra emotionell marknadsförings styrka att förbättra försäljning av produkter samt hur den bör användas för bästa effektivitet. Undersökning kommer också ta upp emotionell marknadsförings motpart rationell marknadsföring, eftersom det är dessa två typer som marknadsföring delas in i. I undersökningen relaterar vi starkt till kognitiv psykologi för att dra slutsatser kring ämnet i helhet.

  • 13352. Åkerberg, Linnea
    De nya spelreglerna för varumärket och det personliga identitetsskapandet: En uppsats om identitetsskapande med hjälp av varumärken i ett digitalt sammanhang.2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis is about the human identity in the postmodern society, and how it changes throughout the paradigm shift we’re going forward into. What kind of impact do the various blogs have on their public concerning the consumption of brands and fashion? And how come various big brands choose to do their product placement on specific blogs? In this thesis I will discuss and compare the changes from how we used to show our status in the society in the past and how we do it today with digital tools.  Why are people so urged to show others in the society who they are, and how come we do it by wearing specific clothes and brands that other tells us to wear in order to have a higher status? These phenomena’s reflects the way we build our identity today. The other aspect of the digitalization I’m discussing in this thesis is the importance of package-design in order to attract costumers to the physical store, and maintain the brand-loyalty during the transition for the stores.

  • 13353.
    Åkerberg, Niklas
    Blekinge Institute of Technology, Faculty of Engineering, Department of Spatial Planning.
    Urban farming and its relation to Public Space: Theorizing the potential for strengthen the urban life in Hallonbergen, Sweden2014Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    With more than half of the worlds population living in urban areas and a great increasing to be expected in the coming decades, we need to develop our approach to planning urban environments. The public space will probably have to be used by a greater concentration of people, and it is therefore necessary to be able to ensure that our public spaces meets people’s demands. In this thesis I want to see if Urban Farming can help to improve the urban life in public areas. An approach is taken to view urban farming from a perspective where the food production is not in focus, but rather how it can create an opportunity for social interaction for people, both participants and observers. This is because, according to my theoretical perspective can promote urban life and the process of social sustainability. Through a study of previous research and literature on the subject can previous experiences of urban farmings social impacts and relation to the public life be distinguished. Three interviews have been conducted, all with different actors related to urban farming, in order to form a picture of how the working with urban farming occurs and own experiences from different levels of the society. In the thesis is also a conceptual design proposal included. The design area is located in Hallonbergen, Sweden. To form an understanding for the public life in the area a survey of the inhabitants assumptions of their neighborhood and analysis have been performed. It is concluded that the inhabitants in Hallonbergen experiences several social problems in their habitat. In relation to experiences from the literature and the expert interviews, it can be concluded that it is highly likely that a urban farming would be to the benefit of social interaction between the tenants. Which according to the theories will improve the urban life in public places. In the process of social sustainability is key factors defined, social equity and community sustainability. The research can conclude that previous experiences and research indicates that urban farming can have a strong impact on these. Conclusions of the thesis hopes to bring a new perspective on the effects from urban farming, where an understanding of the social qualities can be at the center instead of food production.

  • 13354.
    Åkerlind, Josefin
    et al.
    Blekinge Institute of Technology, School of Health Science.
    Persson, Maria
    Blekinge Institute of Technology, School of Health Science.
    Äldre och djur: Husdjurens påverkan på äldre demenssjuka människor, på särskilt boende2008Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Bakgrund: Människan har omgivit sig med husdjur sedan lång tid tillbaka, och är än idag en del av många människors vardag. Tidigare forskning har antytt att husdjur i vårdsammanhang har genererat positiva effekter. Syfte: Syftet med denna studie var att, ur vårdarens synpunkt, undersöka hur husdjur påverkar äldre demenssjuka människor, på särskilt boende. Metod: En litteraturstudie baserad på sex vetenskapliga artiklar, som bearbetades med inspiration av Graneheim och Lundmans innehållsanalys. Resultat: Resultat som framkommit var bland annat att problembeteenden och otrygghetsyttringar minskade, puls - och blodtrycksvärden sjönk, samt sömn och sociala funktioner förbättrades. Resultatet indikerar på att hälsan för demenssjuka förbättrades till följd av djurterapi. Konklusion: Studiens resultat tyder på att djurterapi kan ha en positiv betydelse för demenssjukas hälsa. Hälsovinster av djurterapi skulle även kunna ha betydelse för läkemedelskonsumtionen hos denna patientgrupp. Forskning inom detta ämne skulle behöva utvidgas.

  • 13355.
    Åkerlund, Jonas
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Mattsson, Ludvig
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Gestaltning av klasskillnader i spel2016Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Den här uppsatsen undersöker hur gestaltning av klasskillnader kan skildras på olika sätt i en

    spelmiljö. Syftet med undersökningen är att få fram alternativa sätt för att gestalta klasskillnader

    på i spelmiljöer. Detta för att försöka påverka hur spelutvecklare kommer gestalta klasskillnader

    i framtida spelproduktioner. För att undersöka problemområdet har teorier och idéer applicerats i

    3D-modeller som sedan har lagts in i en spelmiljö. Uppsatsen är uppdelad i tre delar. Tidigare

    forskning, produktion och diskussion.

  • 13356.
    Åkerud, Daniel
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Systems and Software Engineering.
    Rendlo, Henrik
    Blekinge Institute of Technology, School of Engineering, Department of Systems and Software Engineering.
    Natural Language Processing from a Software Engineering Perspective2004Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    This thesis is intended to deal with questions related to the processing of naturally occurring texts, also known as natural language processing (NLP). The subject will be approached from a software engineering perspective, and the problem description will be formulated thereafter. The thesis is roughly divided into two major parts. The first part contains a literature study covering fundamental concepts and algorithms. We discuss both serial and parallel architectures, and conclude that different scenarios call for different architectures. The second part is an empirical evaluation of an NLP framework or toolkit chosen amongst a few, conducted in order to elucidate the theoretical part of the thesis. We argue that component based development in a portable language could increase the reusability in the NLP community, where reuse is currently low. The recent emergence of the discovered initiatives and the great potential of many applications in this area reveal a bright future for NLP.

  • 13357.
    Åkeson, Ann Carolin
    Blekinge Institute of Technology, Department of the Humanities.
    Att synliggöra jämlikhet mellan skillnader: en bildningsgång i humor1999Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [sv]

    Dikterna "Självbiografi" och "Partitur" kan ses som ett bidrag till 60-talets seenderelativistiska litterära debatt, genom att de visar hur ett liv som är präglat av 'osynlighet' och oförstående kan uppfattas som ett "döden-i-livet"-tillstånd. Men de visar även hur man genom dialog kan åstadkomma en förändring. I "Självbiografi" synliggörs två dialoger. En inre dialog i form av minnets cirkularitet mellan nu och då och en yttre mellanmänsklig dialog som blir synlig genom diktjagets replik. I dessa dialogers möte formas en kritik mot patriarkatets selektiva seende, i såväl den litterära traditionen som den samtida seenderelativistiska litterära debatten. Kritiken kommer till uttryck i potatismetaforen och visar att en ohälsosam yttre miljö påverkar det inre och gör att en 'osynlig' människa, bildligt talat, ruttnar bort. Även i "Partitur" syns två dialoger. Den inre dialogen försiggår mellan explicita och implicita, ibland motsägelsefulla, röster i en språkfilosofisk anda. Detta tolkar jag inte som kontaktlöshet och språkpessimism, så som den tidigare receptionen menat. Jag ser det istället som en synliggjord del av diktjagets bildningsgång: att bolla tankar fram och tillbaka inom sig gör att hon kommer vidare i sin bildningsgång; genomgår en egen attitydförändring, som möter andra människors tankar i en yttre dialog. Var för sig visar diktjagen, i respektive bildningsgång, att ett jämbördigt dialogiskt möte kan komma till stånd som en "jämlikhet mellan skillnader" i enlighet med Gunnar Ekelöfs 'strountes'-poetik och Lars Ahlins humorbegrepp, båda aktuella på 60-talet. Olika perspektiv i dialogiskt möte synliggör den 'osynlighet' som vid olika tillfällen i dikterna har liknats vid "döden-i-livet". Därigenom kan diktjagen erhålla en existensiell bekräftelse som ger dem förmåga att kunna bejaka livets svårigheter: att se sorg och glädje som förutsättning för varandra, istället för att genom distansering försöka uthärda svårigheterna.

  • 13358.
    Åkesson, Anders
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Lewenhagen, Kenneth
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Node.js in Open Source projects on Github: A literature study and exploratory case study2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This study has been performed with an aim to provide an insight into how Node.js is used and the Node.js technology adaptation in the open source community. This research displays the diversity of Node.js and can inspire the reader to further development or continued research.

    Studies into different usages of Node.js have been missing in academic research and therefore this study gives a new, important insight into this technology.

    The authors used the exploratory case study methodology. For data collection, the authors created a JQuery and HTML script that fetched the desired dataset from Github and that were used as a static base for the study. Based on the usage areas extracted from the literature study, the authors specified different categories of usage. The dataset was manually investigated and placed into the categories, if they were relevant.

    The results show that web applications is by far the most well represented category with over 50% of all usages falling into this category. Network applications and Web servers come in at second and third position with 14% and 13% respectively.

    This study provided further categories and the authors could generate a set of diagrams, showing a trend on how the different usage areas changed from 2010 to 2015.

  • 13359.
    Åkesson, Gustav
    et al.
    Blekinge Institute of Technology, School of Computing.
    Rantzow, Pontus
    Blekinge Institute of Technology, School of Computing.
    Performance evaluation of multithreading in a Diameter Credit Control Application2010Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    Moore's law states that the amount of computational power available at a given cost doubles every 18 months and indeed, for the past 20 years there has been a tremendous development in microprocessors. However, for the last few years, Moore's law has been subject for debate, since to manage heat issues, processor manufacturers have begun favoring multicore processors, which means parallel computation has become necessary to fully utilize the hardware. This also means that software has to be written with multiprocessing in mind to take full advantage of the hardware, and writing parallel software introduces a whole new set of problems. For the last couple of years, the demands on telecommunication systems have increased and to manage the increasing demands, multiprocessor servers have become a necessity. Applications must fully utilize the hardware and such an application is the Diameter Credit Control Application (DCCA). The DCCA uses the Diameter networking protocol and the DCCA's purpose is to provide a framework for real-time charging. This could, for instance, be to grant or deny a user's request of a specific network activity and to account for the eventual use of that network resource. This thesis investigates whether it is possible to develop a Diameter Credit Control Application that achieves linear scaling and the eventual pitfalls that exist when developing a scalable DCCA server. The assumption is based on the observation that the DCCA server's connections have little to nothing in common (i.e. little or no synchronization), and introducing more processors should therefore give linear scaling. To investigate whether a DCCA server's performance scales linearly, a prototype has been developed. Along with the development of the prototype, constant performance analysis was conducted to see what affected performance and server scalability in a multiprocessor DCCA environment. As the results show, quite a few factors besides synchronization and independent connections affected scalability of the DCCA prototype. The results show that the DCCA prototype did not always achieve linear scaling. However, even if it was not linear, certain design decisions gave considerable performance increase when more processors were introduced.

  • 13360. Åkesson, Henrik
    Active control of vibration and analysis of dynamic properties concerning machine tools2007Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Vibration in internal turning is a problem in the manufacturing industry. Vibrations appear under the excitation applied by the material deformation process during the machining of a workpiece. In order for a lathe to perform an internal turning or boring operation, for example, in a pre-drilled hole in a workpiece, it is generally required that the boring bar should be long and slender; therefore extra sensitive to vibrations. These vibrations will affect the result of machining, in particular the surface finish, also the tool life may be reduced. As a result of tool vibration, severe acoustic noise frequently occurs in the working environment. This thesis comprises three parts and the first part presents a method for active control of boring bar vibration. This method consists of an active boring bar controlled by, for example, an analog controller. The focus lies on the analog controller and the advantages that may be obtained from working in the analog domain. The controller is a lead-lag compensator with digitally controlled parameters, such as gain and phase. However, signals remain in the analog domain. In addition, the analog controller is compared with a digital adaptive controller and it is found that both controllers yield an attenuation of the vibration by up to 50 dB. The second part of this thesis concerns the dynamic properties of a clamped boring bar used by the industry. In order to design a robust controller for a certain system, knowledge about the system's dynamic properties is required. On the workshop floor, a boring bar is dismounted and remounted, and reconfiguration of boring bars will alter the dynamic properties of the clamped boring bar. The dynamic properties of a standard boring bar and an active boring bar for a number of possible clamping conditions, as well as for a linearized clamping have been investigated based on an experimental approach. Also simple Euler-Bernoulli modeling of clamped boring bars incorporating simple non-rigid models of the boring bar clamping are investigated. Initial simulations of nonlinear SDOF systems have been carried out: one with a signed squared stiffness and one with a cubic stiffness. The purpose of these simulations was to identify a nonlinearity that introduces a similar behavior in the SDOF system dynamics as the nonlinear behavior observed in the dynamic properties of a clamped boring bar. The third and final part of this thesis focuses on vibration analysis methods in engineering education. A signal analyzer (which is a commonly used instrument in signal processing and vibration analysis) was made accessible via the Internet. Assignments were developed for students to learn and practice vibration analysis on real signals from a real setup of a relevant structure; a clamped boring bar. Whilst the experimental setup was fixed, the instrument and sensor configuration nonetheless enable a variety of experiment, for example: excitation signal analysis, spectrum analysis and experimental modal analysis.

  • 13361. Åkesson, Henrik
    Analysis of Structural Dynamic Properties and Active Vibration Control Concerning Machine Tools and a Turbine Application2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Vibration in metal cutting is a common problem in the manufacturing industry, especially when long and slender tool holders or boring bars are involved in the manufacturing process. Vibration has a detrimental effect on machining. In particular the surface finish is likely to suffer, but tool life is also most likely to be reduced. Tool vibration also results in loud noise that may disturb the working environment. The first part of this thesis describes the development of a robust and manually adjustable analog controller capable of actively controlling boring bar vibrations related to internal turning. This controller is compared with an adaptive digital feedback filtered-x LMS controller and it displays similar performance with a vibration attenuation of up to 50 dB. A thorough experimental investigation of the influence of the clamping properties on the dynamic properties of clamped boring bars is also carried out in second part of the thesis. In relation to this, it is demonstrated that the number of clamping screws, the clamping screw diameter size, the screw tightening torque and the order the screws are tightened, have a significant influence on a clamped boring bar’s eigenfrequencies as well as on its mode shape orientation in the cutting speed - cutting depth plane. Also, an initial investigation of nonlinear dynamic properties of clamped boring bars was carried out. Furthermore, vibration in milling has also been studied in relation to millingtool holders with a long overhang. A basic investigation concerning the spatial dynamic properties of the tool holders of milling machines, both when not cutting and during cutting, has been carried out. Also, active control of milling tool holder vibration has been investigated and a first prototype of an active milling tool holder was implemented and tested. The challenge of transferring electrical power while maintaining good signal quality to and from a rotating object is addressed and a solution to this is proposed. Finally, vibration is also a problem for the hydroelectric power industry. In Sweden, hydroelectric power plants stand for approximately half of Sweden’s electrical power production and are also considered to be a so-called green source of energy. When renovating water turbines in small-scale hydroelectric power plants and modifying them to optimize efficiency, it is not uncommon that disturbing vibrations occur in the power plant. These vibrations have a negative influence on the production capacity and will wear various components quickly. Occasionally, these vibrations may cause severe damage to the power plant. To identify this vibration problem, experimental modal analysis and operating deflection shape analysis were utilized. To reduce the vibration problem, active control using inertial mass actuators was investigated. Preliminary results indicate a significant attenuation of the vibrations.

  • 13362. Åkesson, Henrik
    Investigation of the Dynamic Properties of a Milling Structure; Using a Tool Holder with Moderate Overhang2009Conference paper (Refereed)
    Abstract [en]

    Vibration problem during metal cutting occurs frequently in the manufacturing industry. The vibration level depends on many different parameters such as material type, dimensions of the workpiece, rigidity of tooling structure, cutting data and operation mode. In milling the cutting process subject the tool to vibrations and having a milling tool holder with long overhang, will most likely results in high vibration levels. These vibrations have a consequence of reduced tool life, poor surface finishing and disturbing sound. An investigation of dynamic properties of a milling tool holder with moderate overhang has been carried out by means of experimental modal analysis and vibration analysis during operating mode. Both angular vibrations of the rotating tool and vibrations of the machine tool structure were examined during milling. Also, bending motion of the rotating milling tool holder was examined during cutting. This paper focuses on identifying the source/sources of the dominating milling vibration components and to identify that of these vibrations which may be related to the structural dynamic properties of the milling tool holder.

  • 13363. Åkesson, Henrik
    et al.
    Brandt, Anders
    Håkansson, Lars
    Lagö, Thomas L
    Claesson, Ingvar
    Operational Modal Analysis of a Boring Bar During Cutting2005Conference paper (Other academic)
    Abstract [en]

    Internal turning or boring operation is a common metal working process that is usually associated with vibration problems. Vibration problems in internal turning considerably influence important factors such as surface quality, productivity, production costs, etc. In this paper we report analysis results from an operational modal analysis of a boring bar during cutting operation. The results are compared with operating deflection shape results and traditional modal analysis results of the same boring bar. Results show that the first bending modes in the directions of cutting speed and cutting depth are active in the operating vibrations. The three analysis methods result in similar conclusions.

  • 13364. Åkesson, Henrik
    et al.
    Gustavsson, Ingvar
    Håkansson, Lars
    Claesson, Ingvar
    Remote Experimental Vibration Analysis of Mechanical Structures over the Internet2005Conference paper (Refereed)
    Abstract [en]

    Experimental vibration analysis is of significant importance for e.g. the automobile and aircraft industry. It provides detailed information concerning the actual dynamic properties of vibration, structures, etc. Commonly, information from experimental vibration analysis is used in the development or modification of structures, processes, etc. to obtain for instance a required dynamic behaviour. It usually involves analysis methods such as; spectrum analysis, correlation analysis, experimental modal analysis and operating deflection shapes analysis (ODS). Large experience is generally required to obtain reliable results with these methods. The best way to acquire such experience is to spend many hours in a laboratory supervised by an expert teacher. However, in engineering education the experimental resources are limited and the traditional way of conducting vibration experiments is to participate in time limited scheduled lab sessions. Internet, however, provides the opportunity for engineering students to access the practical and theoretical knowledge advancement in experimental vibration analysis that is highly attractive for the industry. Laboratory exercises in, for example, experimental vibration analysis and signal processing courses, can now be performed remotely using real equipment. Advanced vibration experiments have been conducted over the Internet at Blekinge Institute of Technology, Sweden; the experiments have been carried out using experimental hardware located in a small closed laboratory. Exercises are adapted to on-campus students as well as distance learning engineers in continuing education programs. A new possibility to directly integrate vibration experiments into lectures given by expert teachers appears and after each lecture the students can repeat and elaborate on the experiments. Thus, enabling the students to carry out the experiments within a course at home using the time they require for sufficient comprehension. In this paper the remote experimental vibration analysis laboratory and its possibilities will be presented.

  • 13365. Åkesson, Henrik
    et al.
    Håkansson, Lars
    Gustavsson, Ingvar
    Zackrisson, Johan
    Claesson, Ingvar
    Lagö, Thomas L
    Vibration Analysis of Mechanical Structures over the Internet Integrated into Engineering Education2006Conference paper (Refereed)
    Abstract [en]

    Experimental vibration analysis is one of the most important tools for analyzing dynamic properties of mechanical structures. The information from experimental vibration analysis is used in the development of products to obtain a required dynamic behavior, or for instance classify vibration problems in different public, industrial environments etc. In order to carry out such experiments with high quality, knowledge about different analysis methods is of great importance. Also a large experimental experience is required to obtain reliable results as in any field. In engineering education experiment using real mechanical structures and equipment is of significance for the learning process. In traditional university laboratories students conduct experiments under the supervision of an instructor. However, a trend towards decreasing investments to maintain these laboratories can be seen all over the world and instead an increase of simulations or theoretical experiments is replacing these hands on experiments due to cost. Blekinge Institute of Technology (BTH), Sweden provide the opportunity for engineering students to remotely access the practical and theoretical knowledge advancement in experimental vibration analysis that is highly attractive for the industry. Remote laboratory exercises are to day a reality at BTH and are a complement to on-campus laboratory experiments, increasing the availability of the instruments. Previously vibration experiments have been conducted over the Internet at BTH, using experimental hardware located in a small closed laboratory. A further step towards a more user-friendly interface has been developed, increasing the feeling of being in front of a real instrument instead of a virtual front panel. This paper presents a new remote vibration laboratory and how remote experimental vibration analysis has been integrated in the engineering education as a complement to ordinary lessons and experiments in traditional laboratories.

  • 13366. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Claesson, Ingvar
    Håkansson, Lars
    On the Development of a Simple and Robust Active Control System for Boring Bar Vibration in Industry2007In: International Journal of Acoustics and Vibration, ISSN 1027-5851, Vol. 12, no 4, p. 139-152Article in journal (Refereed)
    Abstract [en]

    Vibration in internal turning is a problem in the manufacturing industry. A digital adaptive controller for the active control of boring bar vibration may not be a suficient solution to the problem. The inherent delay in a digital adaptive controller delays control authority and may result in tool failure when the load applied by the workpiece on the tool changes abruptly, e.g. in the engagement phase of the cutting edge. A robust analog controller, based on a lead-lag compensator, with simple adjustable gain and phase, suitable for the industry application, has been developed. Also, the basic principle of an active boring bar with embedded actuator is addressed. The performance and robustness of the developed controller has been investigated and compared with an adaptive digital controller based on the feedback filtered-x algorithm. In addition, this paper takes into account those variations in boring bar dynamics which are likely to occur in industry; for example, when the boring bars is clamped in a lathe. Both the analog and the digital controller manage to reduce the boring bar vibration level by up to approximately 50 dB.

  • 13367. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Analysis of dynamic properties of boring bars concerning different clamping conditions2009In: Mechanical systems and signal processing, ISSN 0888-3270, E-ISSN 1096-1216, Vol. 23, no 8, p. 2629-2647Article in journal (Refereed)
    Abstract [en]

    Boring bars are frequently used in the manufacturing industry to turn deep cavities in workpieces and are usually associated with vibration problems. This paper focuses on the clamping properties’ influence on the dynamic properties of clamped boring bars. A standard clamping housing of the variety commonly used in industry today has been used. Both a standard boring bar and a modified boring bar have been considered. Two methods have been used: Euler–Bernoulli beam modeling and experimental modal analysis. It is demonstrated that the number of clamping screws, the clamping screw diameter sizes, the screw tightening torques, the order the screws are tightened has a significant influence on a clamped boring bars eigenfrequencies and its mode shapes orientation in the cutting speed—cutting depth plane. Also, the damping of the modes is influenced. The results indicate that multi-span Euler–Bernoulli beam models with pinned boundary condition or elastic boundary condition modeling the clamping are preferable as compared to a fixed-free Euler–Bernoulli beam for modeling dynamic properties of a clamped boring bar. It is also demonstrated that a standard clamping housing clamping a boring bar with clamping screws imposes non-linear dynamic boring bar behavior.

  • 13368. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Analog and Digital Approaches of Attenuation Boring Bar Vibrations during Metal Cutting Operations2005Conference paper (Refereed)
    Abstract [en]

    In metal cutting operations tool vibration is a frequent problem. Vibrations appear under the excitation applied by the material deformation process during the machining of a workpiece. In order to perform an internal turning or boring operation, e.g. in a pre-drilled hole in a workpiece, it is generally required that the boring bar should be long and slender; therefore it is easily subjected to vibrations. These vibrations will affect the result of machining, in particular the surface finish, and also the tool life may be reduced. As a result of tool vibration severe acoustic noise frequently occurs in the working environment. The vibration problem is to a large extent related to the boring bar low-order fundamental bending modes. In order to control boring bar vibrations in the primary cutting direction an analog and a digital feedback controllers have been used. In both approaches an active boring bar with a built-in actuator has been used. In order to measure the response of the active boring bar, accelerometers are mounted nearby the area, where the excitation force is applied due to material deformation process. This means that in either approach the boring bar vibrations are attenuated actively by the controlled secondary anti-vibrations induced by the actuator. The digital controller, based on the feedback filtered-x LMS-algorithm, manages to reduce the boring bar vibrations in the primary cutting direction by up to approximately 44 dB at the first bending resonance frequency. The analog controller, based on a flexible orthogonal gain and phase lag compensation, results in an attenuation of the boring bar vibrations in the primary cutting direction by up to approximately 40 dB at the first bending resonance frequency. Both controllers also suppress all the harmonics of the first bending resonance frequency. Vibration attenuation performances of the two controllers are compared and discussed.

  • 13369. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Advantages and Drawbacks Using Different Sensors in Feedback Control in Active Boring Bar Applications2008Conference paper (Refereed)
    Abstract [en]

    Several prototypes of an active boring bar for industrial applications have been produced for the reduction of cumbersome vibration problems in metal cutting processes. The active boring bar is used in lathe application to machine deep and precise holes in workpieces where long and slender boring bars are required. A vibration sensor embedded in the boring bar together with an embedded actuator is utilized in order to enable active feedback control. This paper discusses different techniques of measuring boring bar vibrations and their influence on the feedback control scheme as well as on the active control performance. Also the dynamic properties of the boring bar are considered when utilizing the different sensor techniques. The sensors that have been used are; accelerometer, strain gauges and piezo film.

  • 13370. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Analog versus Digital Control of Boring Bar Vibration2005Conference paper (Refereed)
    Abstract [en]

    In workshops where metal cutting is performed, the machining processes frequently introduces productivity degrading vibration problems and annoying sound, sometimes almost at unbearable levels. Besides producing disturbing noise, the vibrations affect the surface finish of the workpiece and the tool life. Two different approaches based on feedback control are investigated, both applied for the control of an active boring bar. The first approach is based on a digital adaptive feedback controller; the feedback filtered-X LMS algorithm. The second approach is based on an analog controller; a feedback controller with gain and phase orthogonally adjustable, thus flexible for the control of systems with different dynamic properties. Based on open loop frequency response function estimates, robustness and stability of both the digital and the analog feedback control system are discussed. A comparison of the two controllers concerning their boring bar vibration attenuation performance shows that the analog controller attenuates the vibration in same order of magnitude as the digital controller which is approximately by up to 40 dB.

  • 13371. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Comparison between different controllers when having abrupt changes in a process2006Conference paper (Refereed)
    Abstract [en]

    When metal cutting is performed, the machining processes introduce productivity degrading vibration. By applying an active control scheme, theses vibrations can be reduced significantly with the result of improved surface finish of the work piece and increased tool life. Due to the large difference of boundary conditions during the machining process, a controller fast enough to follow these changes is needed, for example from no cutting to cutting - the actual engagement of the cutting process. If the controller does not success to follow fast enough, the tool tip might break, as is the case without any active damping. Different approaches based on feedback control are investigated; all implemented using an active boring bar. The first approach is based on a digital adaptive feedback controller; the feedback filtered-X LMS algorithm. The two other controllers are analog; one is a lead controller and the other is lead-lag controller, both with gain and phase orthogonally adjustable. This paper focuses on robustness, stability and convergence of the digital and the analog feedback controllers. The analysis is based on open loop frequency response function estimates during different operating conditions.

  • 13372. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Developments Steps of an Active Boring Bar for Industrial Application2008Conference paper (Refereed)
    Abstract [en]

    In the manufacturing industry, boring bar vibration in internal turning is a frequent problem. Boring bars are often used to machine deep and precise holes in workpieces and are thus usually long and slender. The consequences of boring bar vibration are generally; reduced tool life, poor surface finish and high sound levels in the working environment. Boring bar vibration may however be attenuated using a suitable active vibration control system. Such system may for instance rely on feedback control and an active boring bar with embedded actuators. There are some steps between research results, having a controlled laboratory setup working, and applying the technology in industry, that are essential. Several prototypes of an active boring bar for industrial applications have been produced as part of this research. Different development phases and some challenges along the road to a successful product are discussed. Also, an active boring bar vibration control system in industry is presented and what challenges such a development may include.

  • 13373. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Dynamic Properties of Tooling Structure: Hydraulic Clamping versus Standard Screw Clamping in a Lathe Application2008Conference paper (Other academic)
    Abstract [en]

    During turning, the metal deformation process excites the tooling structure and may result in high and degrading tool vibration levels. In internal turning the boring bar is generally the weakest link of the tooling structure. The boundary conditions imposed on the boring bar by the clamping housing influence the dynamic properties of a clamped boring bar. The dynamic properties of a clamped boring bar have been investigated for two different clamping housings; one that clamps the boring bar by means of hydraulic pressure and one that clamps the boring bar by means of clamping screws. Both experimental and analytical methods have been utilized in the investigation.

  • 13374. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Estimation and Simulation of the Nonlinear Dynamic Properties of a Boring Bar2011In: International Journal of Acoustics and Vibration, ISSN 1027-5851, Vol. 16, no 1, p. 35-43Article in journal (Refereed)
    Abstract [en]

    In this paper, an initial investigation of the nonlinear dynamic properties of clamped boring bars is carried out. Two nonlinear, single-degree-of-freedom models with different softening spring nonlinearities are introduced for modeling the nonlinear dynamic behavior of the fundamental bending mode in the cutting speed direction of a boring bar. Also, two different methods for the simulation of nonlinear models are used. The dynamic behavior in terms of frequency response function estimates for the nonlinear models and the experimental modal analysis of the clamped boring bar is compared. Similar resonance frequency shift behavior for varying excitation force levels is observed for both the nonlinear models and the actual boring bar.

  • 13375. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    INVESTIGATION OF THE DYNAMIC PROPERTIES OF A BORING BAR CONCERNING DIFFERENT BOUNDARY CONDITIONS2007Conference paper (Refereed)
    Abstract [en]

    The boring bar is one of the most widely used types of tool holder in metal cutting operations. The turning process subjects the tool to vibration, and cutting in deep workpiece cavities is likely to result in high vibration levels. The consequences of such vibration levels are generally; reduced tool life, poor surface finishing and disturbing sound. Internal turning frequently requires a long and slender boring bar in order to machine inside a cavity, and the vibrations generally become highly correlated with the fundamental bending mode of the boring bar. Different methods can be applied to reduce the vibrations, the implementation of the most efficient and stable methods require in depth knowledge concerning the dynamic properties of the tooling system. Furthermore, the interface between the boring bar and the clamping house has a significant influence on the dynamic properties of the clamped boring bar. In this paper different cases of boundary condition of the boring bar are presented partly analytically but also experimentally. This paper focuses on dynamic properties of a boring bar that arise due to different clamping conditions of the boring bar introduced by a clamping house commonly used in the manufacturing industry.

  • 13376. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Investigation of the Dynamic Properties of a Passive Damped Boring Bar2008Conference paper (Other academic)
    Abstract [en]

    Vibration problem during metal cutting is a degrading reality in the manufacturing industry and have a negative impact on the productivity which increases the over all production costs. Sometimes it’s also impossible to achieve the required tolerances. Different methods can be applied to reduce the vibrations, for example by using passively tuned damper or active control. This paper examines the dynamic properties of a boring bar with passive tuned damper, aiming on enhanced vibration con-trol combining passive control and active control. By combining these two methods it is likely that the performance of the passive tuned damper will be enhanced in the sense of wider working range with respect to cutting parameters and materials of workpieces. However, implementation of effi-cient and stable methods requires in-depth knowledge concerning the dynamic properties of the tooling system. The examination of the passive boring bar covers a wide range of cutting parame-ters and the main classes of workpiece materials. This is the first step in the development of a bor-ing bar involving two technologies complementing each other, that is, passive tuned damper and active control which is an already patented technology.

  • 13377. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Vibration in Turning and the Active Control of Tool Vibration2007Conference paper (Refereed)
    Abstract [en]

    A frequent problem in the manufacturing industry today is the vibrations or chatter induced in machine tools during machining. Chatter in machine tools affect the result of machining, particularly the surface finish. Furthermore, tool life is correlated with the degree of vibration and acoustic noise introduced. The material deformation process during turning induces a broadband excitation of the machine tool and chatter or tool vibration is usually related to a low-order bending mode of, for example, the tool holder shank in external turning, the boring bar in internal turning. Frequently, the tool holder responses during continuous unstable machining have non-linear properties and exhibit advanced stochastic behaviour. Generally, the tooling structure - the interface between the cutting tool or insert and the machine tool - is the weakest link in a machining system. Active control of tool vibration, however, enables a flexible solution to selectively increase the dynamic stiffness of the tooling structure at the actual frequency of the dominating bending modes. Based on adequate controllers, tool holder shanks and boring bars with embedded actuators and vibration sensors tool vibration in turning may be reduced significantly.

  • 13378. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Sigfridsson, Andreas
    Svensson, Tobias
    Lagö, Thomas L
    A First Prototype of an Active Boring Bar Tested in Industry2006Conference paper (Other academic)
    Abstract [en]

    Metal cutting is a common process in the manufacturing industry. Vibration problem during metal cutting is a reality for these manufactures. The vibration level depends on many different parameters such as material type, dimensions of the workpiece and boring bar, cutting data and operation mode. Internal cutting is one of the most troublesome operation modes, without any continuous monitoring and control from an operator grave vibration levels quickly arises. From the industry point of view this is an expense in the production line. The reduced tool life and the coarse surface finishing caused by the large vibration will force the operator to stop the cutting process, either to change tool when it is broken or change cutting data like decreasing the cutting depth. Any interference like this increases the working time for each component tremendous. These problems have been located and examined in an industry producing and renovating components using a lathe. One lathe was chosen for further investigation by experimental modal analysis and analysis during operational mode. The examination was done in an environment with machining processes in full operation mode and also during non-working ours. After analyzing the problem different solution where scrutinized and a first prototype where constructed. The solution to the problem is an active boring bar. This paper will present the procedure from analyzing a problem in industry to the test of the first prototype of the solution.

  • 13379. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Claesson, Ingvar
    Sigfridsson, Andreas
    Svensson, Tobias
    Lagö, Thomas L
    Active Boring Bar Prototype Tested in Industry2006Conference paper (Other academic)
    Abstract [en]

    Metal cutting processes are common in the manufacturing industry. Vibration problems during metal cutting are a degrading reality in the manufacturing industry and have a negative impact on the productivity and increase’s the production costs. The vibration level depends on many different parameters such as material type, dimensions of the workpiece, tool, tooling structure, machine structure, the cutting data and operation mode. Internal turning is one of the most troublesome operation modes concerning vibration. It generally requires that extra care must be taken with pro-duction planning and in the preparations for the machining of a workpiece. Frequently, continuous monitoring and control by a skilled operator is required to avoid grave degrading vibration levels. The reduced tool life and the coarse surface finishing generally caused by large vibration levels will e.g. force the operator to stop the cutting process, either to change tool when it is broken or change cutting data like decreasing the cutting depth. Any interference like this increases the production time and cost for each component tremendously. In an industry producing and renovating compo-nents using different machine tools, a particular lathe used for internal turning of certain details with extensive vibration problem was chosen for further investigation by experimental modal analysis and vibration analysis during operation. The examination was done in an environment with ma-chine tools in full operation and also during non-working ours. After analyzing the problem different solutions for the reduction of the vibration problem was investigated and subsequently a first proto-type was constructed. The solution to the problem is active control of the tool vibration using an active boring bar. This paper will present the procedure from analyzing a problem in industry to the test of the first prototype of the solution.

  • 13380. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Lagö, Thomas L
    Claesson, Ingvar
    Investigation of the Dynamic Properties of a Milling Tool Holder2009Report (Other academic)
    Abstract [en]

    Vibration problems during metal cutting occur frequently in the manufacturing industry. The vibration level depends on many different parameters such as the material type, the dimensions of the workpiece, the rigidity of tooling structure, the cutting data, and the operation mode. In milling, the cutting process subjects the tool to vibrations, and having a milling tool holder with a long overhang will most likely result in high vibration levels. As a consequence of these vibrations, the tool life is reduced, the surface finishing becomes poor, and disturbing sound appears. In this report, an investigation of the dynamic properties of a milling tool holder with moderate overhang has been carried out by means of experimental modal analysis and vibration analysis during the operating mode. Both the angular vibrations of the rotating tool and the vibrations of the machine tool structure were examined during milling. Also, vibration of the workpiece and the milling machine was examined during cutting. This re- port focuses on identifying the source/sources of the dominant milling vibration components and on determining which of these vibrations that are related to the structural dynamic properties of the milling tool holder.

  • 13381. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Lagö, Thomas L
    Håkansson, Lars
    Analysis of Dynamic Properties of Boring Bars Concerning Different Clamping Conditions2007Report (Other academic)
    Abstract [en]

    The boring bar is one of the most widely used type of tool holders in metal cutting operations. The turning process subjects the tool to vibrations, and cutting in deep workpiece cavities is likely to result in high vibration levels. The consequences of such vibration levels generally results in: reduced tool life, poor surface finishing and disturbing sound. Internal turning frequently requires a long and slender boring bar in order to machine inside a cavity, and the vibrations generally become highly correlated with one of the fundamental bending modes of the boring bar. Different methods can be applied to reduce the vibrations, the implementation of the most efficient and stable methods require in depth knowledge concerning the dynamic properties of the tooling system. Furthermore, the interface between the boring bar and the clamping house has a significant influence on the dynamic properties of the clamped boring bar. This report focuses on the dynamic properties of a boring bar that arise under different clamping conditions of the boring bar and are introduced by a clamping house (commonly used in the manufacturing industry). The dynamic properties of a boring bar (for different cases of boundary condition of the boring bar) are presented partly analytically but also experimentally.

  • 13382.
    Åkesson, Henrik
    et al.
    Blekinge Institute of Technology, Department of Telecommunications and Signal Processing.
    Sällberg, Benny
    Blekinge Institute of Technology, Department of Telecommunications and Signal Processing.
    Identification and Analysis of Nonlinear Systems2003Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    In classical mechanical engineering the predominant group of system analysis and identification tools relies on Linear Systems, where research have been carried out for over half a century. Usage of Linear Systems is most widely spread, often due to its simple mathematics and formulation for many engineering problems. Although linearizing is a means for simplifying a problem, it will introduce more or less severe modelling errors. In some cases the errors due to linearizing are too large to be practically acceptable, and therefore nonlinear structures and models are sometimes introduced. This thesis aims in implementing and evaluating some popular methods and algorithms for nonlinear structure analysis and identification, with emphasis on systems having nonlinear terms. Preferably the algorithms should be optimized in their computational load. The result are several algorithms for nonlinear analysis and identification. The ones giving best results were the frequency based methods Reverse Path and a Frequency Domain Structure Selection Method (FDSSA). The time domain based method, Nonlinear Autoregressive Moving Average with Exogenous Input (NARMAX), in which a lot of hope had been put, did perform very well in giving good system descriptions, but due to its nonphysical representation it was not suitable for usage in this thesis. The algorithms and methods were finally applied for two cases, a four system black-box case and an experimental test-rig case. The methods did perform well in three out of four systems in the first case, but the methods did not perform well for the second case, due to problems in applying correct levels of excitation force at the test-rig’s resonance frequencies.

  • 13383.
    Åkesson, Mathias
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Fäldt, Erik
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    The Aftermarket Performance of Swedish Initial Public Offerings: A study about short- and long-term performance and underpricing of Initial Public Offerings on the Swedish stock markets2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis examines the performance of IPO firms in the Swedish markets during their first three years of trading to investigate what effects different factors have on the short- and long-term performance. The level of underpricing on Swedish IPOs are also investigated to detect any abnormalities from previous studies on larger markets in the US and Europe. A total of 175 IPO firms included in the sample in the period between 2000 and 2015. The method used to calculate the aftermarket performance is the buy-and-hold abnormal returns method in an event-time portfolio approach. These returns are used as a dependent variable in a multivariable linear regression analysis. The main findings from this study are that IPO firms in the Swedish markets underperform the OMX market index one month and three years after the offering. Conversely, IPO firms in the Swedish markets overperform after 18 months compared to the OMX market index. The results show that Swedish IPOs are on average underpriced and that underpricing has a significant effect on short-term performance. Firm age, offer size and the technology industry also have a significant effect on the first month’s performance of IPO firms; however, there is little support for these factors to affect the longterm performance.

  • 13384.
    Åkesson, Nina
    Blekinge Institute of Technology, School of Health Science.
    Förmå att ha strumporna på: En studie om distriktssköterskors erfarenheter av att medverka till ökad följsamhet till behandling med kompressionsstrumpor efter sårläkning2011Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Tidigare studier visar på en dålig följsamhet till kompressionsbehandling efter sårläkning med en ökad risk för recidivsår. Recidivsår får stora konsekvenser för patientens välbefinnande och ger även en ökad belastning och ekonomiska konsekvenser för sjukvården. Det är viktigt att få patienten medverkande i sin kompressionsbehandling eftersom detta ökar patientens följsamhet till behandlingen. Studiens syfte var att undersöka distriktssköterskors erfarenheter av att medverka till ökad följsamhet till kompressionsbehandling med kompressionsstrumpor hos patienter med läkta venösa bensår. En kvalitativ strategi med induktiv ansats valdes. Materialet samlades in genom att fem distriktssköterskor deltog i en fokusgruppintervju. Intervjun analyserades med en kvalitativ innehållsanalys. Distriktssköterskan hade erfarenheter av hinder och möjligheter i sitt arbete med att medverka till en ökad följsamhet till kompressionsbehandling. Möjligheterna utgjordes av att i patientmötet göra patienten motiverad till att använda sina kompressionsstrumpor. Hindren utgjordes av utebliven patientkontakt och osäkerhet hos distriktssköterskan om behandlingen var optimal för patienten. Distriktssköterskan har goda grunder att arbeta för en ökad följsamhet till kompressionsbehandling efter sårläkning. Resultatet påvisar att behandlingen behöver synliggöras och dess status behövs höjas inom professionen. Detta skulle stärka distriktssköterskans möjligheter att öka patientens följsamhet till kompressionsstrumpor efter sårläkning.

  • 13385.
    Åkesson, Nina
    Blekinge Institute of Technology, School of Health Science.
    Sårsmärta hos personer med venösa bensår. Samband mellan sårsmärta, antibiotika – och kompressionsbehandling2013Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [sv]

    Bakgrund: Smärta är ett vanligt men ofta obehandlat symtom hos patienter med venösa bensår. Sårsmärta i denna patientgrupp kan misstolkas som ett tecken på sårinfektion eller arteriell sjukdom, vilket kan leda till orationell antibiotikabehandling eller otillräcklig kompressionsbehandling. Syfte: Denna studie syftade till att beskriva och jämföra personer med venösa bensår baserat på om de hade sårsmärta eller inte vid inkludering. Ett ytterligare syfte var att undersöka om sårsmärta påverkade förekomst av antibiotika- och kompressionsbehandling under sårläkningstiden. Metod: En kvantitativ ansats med en hypotetisk-deduktiv design antogs. Totalt inkluderades 431 personer med venösa bensår från ett svenskt nationellt kvalitetsregister mellan maj 2009 och februari 2013. Resultat: Medianåldern i urvalsgruppen var 80 år och 64 procent var kvinnor. Sårsmärta rapporterades av 57 procent (n = 245) medan 43 procent (n = 186) rapporterade att de inte hade sårsmärta. Personer med sårsmärta behandlades i större utsträckning med antibiotika jämfört med personer utan smärta. Förekomst av kompressionsbehandling skilde sig inte mellan personer med sårsmärta och personer utan sårsmärta. Slutsats: Resultatet visade på en hög förekomst av sårsmärta, vilket tyder på att sårsmärta är ett angeläget problemområde för alla som behandlar personer med venösa bensår. Sammantaget visar resultatet på vikten av sjuksköterskans kompetens och indikerar behovet av en fungerande omvårdnadsprocess. För att minska det lidande sårsmärta kan orsaka samt minska risken för att sårsmärta leder till icke optimal sårbehandling bör förekomst av sårsmärta få ta en självklar del i omvårdnadsprocessen.

  • 13386. Åkesson, Nina
    et al.
    Öien, Rut
    Forsell, Henrik
    Fagerström, Cecilia
    Blekinge Institute of Technology, Faculty of Health Sciences, Department of Health.
    Ulcer pain in patients with venous leg ulcers related to antibiotic treatment and compression therapy2014In: British Journal of Community Nursing, ISSN 1462-4753, E-ISSN 2052-2215, Vol. 19, no 1, p. S6-S13Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to compare venous leg ulcer patients with and without ulcer pain to see whether ulcer pain affected the use of antibiotic treatment and compression therapy throughout healing. A total of 431 patients with venous leg ulcers were included during the study period. Every patient was registered in a national quality registry for patients with hard-to-heal leg, foot, and pressure ulcers. A high incidence of ulcer pain (57%) was found when the patients entered the study. Patients with ulcer pain had been treated more extensively with antibiotics both before and during the study period. Throughout healing there was a significant reduction of antibiotic use among patients in the 'no pain' group, from 44% to 23% (P=0.008). There was no significant difference between the two groups concerning compression therapy (85% vs. 88%), but 12% of patients in the 'pain' group did not get their prescribed compression compared with 6% of patients in the 'no pain' group. The groups did not differ significantly in terms of ulcer duration, ulcer size or healing time. This study shows a high incidence of ulcer pain, confirming that pain has a great impact on patients with venous leg ulcers. Results further suggest that the presence of ulcer pain increases the prescription of antibiotics but does not affect the use of compression therapy. Several advantages were found from using a national quality registry. The registry is a valuable clinical tool showing the importance of accurate diagnosis and effective treatment.

  • 13387.
    Åkesson, Susanne
    Blekinge Institute of Technology.
    Skolsköterskans metoder i förbättringsarbetet av att upptäcka självskadebeteende hos elever i grund- och gymnasieskolan2015Independent thesis Advanced level (professional degree), 5 credits / 7,5 HE creditsStudent thesis
  • 13388.
    Årevall, Agnieszka Janicka
    Blekinge Institute of Technology, School of Planning and Media Design.
    Urban Agriculture: Sustainability Multiplier2013Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    For some years now, the phenomena of urban agriculture have been present in the public discourse on cities and sustainability. It is often assumed that urban agriculture has the potential to contribute to an increased sustainability of the cities. However, many practical and theoretical obstacles might have to be overcome in order to realize this potential. One ambition of this thesis is to analyse urban agriculture as a “sustainability multiplier” – that is, as a practice that can positively affect a large number of dimensions of sustainability. Another ambition is to study how urban agriculture can contribute to lower the “ecological footprint” of our cities. Two concepts are essential in the discussion and have been given special attention in the thesis: “ecological footprint” and “sustainability”.

  • 13389.
    Årman, Anders
    Blekinge Institute of Technology, School of Planning and Media Design.
    Dags att trappa upp tillgängligheten för äldre2012Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Uppsatsen riktar sig till att öka tillgängligheten för äldre i Galgamarken, ett område som pekas ut som ett typisk exempel för problemet. Problemet är mycket aktuellt med en befolkning vars andel äldre ökar. Enligt regler fastslagna av Förenta nationerna, regler som Sverige beslutat att följa, så ska svenska myndigheter planera för samhällets svagaste grupper. Teori av goda lösningar som möjliggör god tillgänglighet gås igenom och olika forskares synpunkter ger en bred bild på hur lösningarna kan utformas. Genom användning av stråkstrategi så identifieras stråk med särskilt behov av åtgärder. Åtgärdas de utvalda stråken så kommer den generella tillgängligheten öka på Galgamarken. Situationen mellan teori och praktiskt utförande analyseras. De olika utvalda platsernas inventerade problem redogörs och argumenteras de varför några av platserna inte åtgärdas. Sedan görs ett förslag på åtgärder för de valda platsernas tillgänglighetsproblem. Detta görs genom först beskriva den övergripande planeringen om hur stråk kommer bindas samman och vilka effekter detta kan ge. Sedan gås generella lösningar igenom, lösningar som inte behöver vara platsbundna. Tillslut gås de olika platsernas lösningar igenom, var plats för sig. Uppsatsen avslutas med en diskussion om uppsatsens syfte, frågor och hur dessa besvarats. Kritik riktas mot metoderna och resultaten som beskrivs och utformas i uppsatsen.

  • 13390.
    Årsköld, Martin
    Blekinge Institute of Technology, Department of Human Work Science and Media Technology.
    Processoperatörens mobilitet -teknikstöd för mobil larmhantering2002Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [sv]

    Processindustrin har möjligheten att ta steget in i en ny utvecklingsfas där teknik kommer att spela stor roll. I och med att teknik allt mer stödjer mobilitet öppnas möjligheten för processoperatörer att på valfri plats kunna övervaka och styra tillverkningsprocessen. Med denna rapport presenterar författaren sin empiriska studie på en högteknologisk fabrik. Studiens fokus ligger i betydelsen av processoperatörernas mobilitet och hur den framträder i deras arbete. Studien visar att mobilitet för operatörerna på fabriken är en del av deras yrkesutövande och väsentlig för att kunna styra tillverkningsprocessen. Utifrån studien ges förslag på teknik som kan stödja denna mobilitet genom att möjliggöra mobil larmhantering.

  • 13391. Åsa, Ericson
    et al.
    Tobias, Larsson
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Ola, Isaksson
    Andreas, Larsson
    Revisiting the Research Field of Product-Service Systems Development2012Conference paper (Refereed)
    Abstract [en]

    The research within the Product-Service Systems (PSS) field aims to support manufacturing industries’ ability to provide value in terms of a service offer to its customers, simultaneously taking a more holistic approach to eco- sustainability. The industrial idea of providing customer benefits in parallel with robust products is not new, yet equipping engineers to conduct innovation and applying a service perspective in the early design stages is noticed as fairly radical. The purpose in this paper is two-fold. First, to describe research efforts within the PSS field seen through our engineering design lenses, second, to explore and discuss plausible directions and by that identify “white spots” on the map, which may be seen as relevant directions for future research.

  • 13392.
    Åsander, Hanna
    Blekinge Institute of Technology, School of Technoculture, Humanities and Planning.
    Skärva: historiska spår och framtida möjligheter2009Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [sv]

    Examensarbetet Skärva - historiska spår och framtida möjligheter, inleds med en diskussion om vad ett hållbart stadsbyggande är och vad det kan innebära för landskapet som ligger strax utanför staden. Skärva är en sådan plats som ligger nära både Karlskrona och Nättraby. Det går att se en trend i att många flyttar utanför staden och bygger hus. I Karlskrona finns det i dagsläget områden som Verkö, Bastasjö, Skillingenäs och Skärva by där det byggs nytt. Människor vill ha närheten till naturen, men ändå jobbar få av dem som bor på landsbygden med traditionellt jordbruk. Det är många som pendlar till Karlskrona eller Ronneby till sina jobb eller skolor. Hur bör då ett område som Skärva nyttjas i framtiden? Det finns tendenser till att människor som bor i de nybyggda områdena utanför staden vill skärma av sig och inte ha ännu fler som bor alldeles intill. Det var exempelvis tydligt i samrådsredogörelsen för den nya detaljplanen Stora Vörta 1:72. Det är ett nyplanerat bostadsområde precis intill Skärva by där vissa boendes yttranden kan sägas handla om NIMBY (Not In My Backyard) dvs. bygg gärna, men inte precis där jag bor. En fråga att ställa sig då är: Kan det vara läge att sätta ett stopp för mer utbyggnad av landsbygden, eller går det att förtäta i viss grad? Skärva förknippas kanske mest med herrgården som är del av världsarvet Örlogsstaden Karlskrona. Herrgården är byggnadsminnesförklarad och en byggnad med arkitektoniska särdrag som ligger omgiven av ädellövskog och har vacker utsikt över Danmarksfjärden. Ett naturreservat angränsar till herrgården och totalt består det av ett 240 hektar stort mark- och vattenområde som är ett populärt utflyktsmål och har stor betydelse för friluftslivet. För att kunna avgöra vad som bör ske med markanvändningen för hela Skärvaområdet i framtiden genomförs i det här examensarbetet en genomgående analys för en mängd olika delaspekter. Det utmynnar i ställningstaganden som sedan diskuteras vidare i en planeringsdiskussion, där frågor som turistnäringens möjligheter för att ge området ett uppsving tas upp och huruvida det går att rikta nya boendemiljöer mot olika målgrupper. En diskussion kring om landskapet drabbas av ett sönderfall eller läkning genom olika åtgärder avslutar diskussionskapitlet. Slutligen presenteras utifrån författarens synsätt ett planförslag där en övergripande struktur visar på hur det skulle kunna vara möjligt att både bevara den rika kultur- och naturmiljön samtidigt som det går att göra tillägg i bebyggelsen, utan att det ska behöva komma åsikter om att det är mark som används för annat. Föreslagen bebyggelse hamnar nämligen främst på mark som består av impedimentsytor, ytor som har blivit över när väg och järnväg dragits fram. Skärvaområdet består till stora delar av bortglömda och till viss del oupptäckta marker. Att använda sig av historiska kartor för att hitta gamla vägsträckningar och andra strukturer är ett sätt som använts i analysdelen för att ge idéer till var ny bebyggelse och infrastruktur i framtiden kan få utvecklas. Vattendrag, skogsbryn och stenmurar bidrar, tillsammans med andra element, till att forma vackra platser. Med planering går det att se till att naturens egen skönhet inte går förlorad. Det ges idéer för hur det går att återupptäcka landskapet. Det kan ske genom förbättrad information och ett utökat stig- och vägnät i området. Fler människor skulle ges en möjlighet att upptäcka det historiska landskapet och fler markerade leder i området kan bidra till att olika målgrupper med skilda intressen lättare kan samsas. Ett av huvudsyftena med examensarbetet har varit att ge inspiration åt kommunens översiktsplanearbete. Kanske kan tankar och synsätt som genomsyrar detta arbete bidra till ett nytt sätt att se på Skärva.

  • 13393.
    Åsberg, Ondina
    Blekinge Institute of Technology, School of Management.
    Market orientation in small to medium sized Biotech companies in Sweden2007Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The purpose of this study was to investigate if small to medium sized biotechnology companies in Sweden are market oriented, or if they are research and technology orientated. Market oriented meaning being customer focused, having a strong competitor orientation and building customer solutions using a team approach; and the higher the marketing knowledge – the stronger the market orientation. The results are based on in-depth interviews with members of management groups in 10 companies. The findings indicate that biotechnology companies in Sweden are science and technology focused, since it is in their foundation to be so, but that they still can be market oriented. The marketing knowledge seemed to be rather high amongst the interviewed persons and managements spread information regarding the company’s situation, the customers and competition to all employees. Managers and employees met with customers, as well as did personnel from other departments. The regulations, followed by the majority of these companies, structure collection of customer information and its the diffusion into the development process, including using a team approach. Most of the companies are competitor oriented as well. The fundamental market resources were sometimes missing. The companies are research focused until an active decision is taken to change and become marketing focused, and until resources are rebalanced.

  • 13394.
    Åsfält, Pär
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Systems and Software Engineering.
    Stüeken, Jan
    Blekinge Institute of Technology, School of Engineering, Department of Systems and Software Engineering.
    Controlling Changes in Large-Scale Software Development2007Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Changes to a software system are the result of changing requirements or defects during the development. Each change consumes resources for the analysis, decision making, implementation, and verification. Hence, having control over changes is crucial for software development projects to meet schedules, keep quality standards and budgets. Reuse of functionality helps to create new products based on already existing building blocks. Integrating mature components enables to create reliable systems. Software product lines provide means to develop several similar systems based on reuse. Often new products also need to be released frequently to fulfil the customer needs. Shortened lead time for the development then strengthens the importance of reuse. At the same time, limited budgets and competition on the market requires projects to utilize resources efficiently. Developing several releases in parallel enables an even distribution of tasks among different roles in a development organization. Both developing software based on a product line approach and parallel releases put requirements on how changes need to be controlled. In this thesis, software engineering literature is reviewed regarding the knowledge areas of software release management, software product lines and software configuration management. Beyond the most considerable research results also related case studies are presented to show how industry practices counter existing problems. The major part of the thesis is a case study conducted at Sony Ericsson Mobile Communications AB. The outcome of the thesis is an identification of challenges of controlling changes regarding parallel development and using software product lines based on available research results and industry case studies. It further provides a case of a software development organization which faces a high market-pace, uses a software product line approach, and develops several software releases in parallel on different sites around the world.

  • 13395.
    Åström, Anders
    et al.
    Blekinge Institute of Technology.
    Grönlund, Linn
    Blekinge Institute of Technology.
    Ett värdigt boende?: En studie av rum, materialitet och värdighet i praktiken2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Idén om de mänskliga rättigheterna och alla människors lika värde är en idé om hur världen är eller bör vara konstruerad, och på vilket sätt vi människor bör leva i den. Men vad händer då begreppet värdighet färdas i tid och rum och vilka effekter får begreppet för materialitet och den byggda miljön? Uppsatsen undersöker de maktrelationer som iscensätter det ’värdiga boendet’ som en del av målet att upprätthålla människans värdighet i en asylprocess. Vidare analyseras vilka effekter som det ”värdiga” får med fokus på rumslig organisering, materialitet och människor samt hur det rumsliga och materiella påverkar, motverkar och iscensätter makt.

    För att förstå effekterna av begrepp som värdighet måste de studeras i praktiken, d.v.s. hur de ’görs’. I vår uppsats handlar det om asylboendet – dess lokalisering, rumsliga organisering, dess materiella konfiguration och människor. Genom att följa de kopplingar och relationer som etablerats i syfte att upprätthålla människans värdighet visar denna uppsats att då begreppet värdigt färdas i tid och rum översätts det på olika sätt vilket gör att dess innebörd också förskjuts. Studien visar att utsagor om ’alla människors lika värde’ och att asylsökande ska ’behandlas så förmånligt som möjligt’ har förskjutits och omförhandlats mot att vissa människor (icke-medborgare) ses ett hot mot den rådande samhällsordningen och därmed anses kunna behandlas mindre förmånligt, rimligt, tillräckligt eller kostnadseffektivt. Genom ’görandet’ ett intrikat nätverk av upphandlingskrav, policydokument, byggnader, objekt, människor, rutiner etc.  är den byggda miljön både en del och en effekt av en kunskaps- och maktordning. Studien visar också att de boende genom sina handlingar också handlar och ger egen definition åt det värdiga och att de även påverkar den miljö de lever i. Makten kan därför inte ses som hierarkisk utan något som sker i alla kopplingar och på alla nivåer. 

    Studien visar att det värdighet inte är något statiskt eller universellt - något som likvärdigt omfattar alla, alltid på alla platser - utan något som ständigt förändras, omförhandlas och omformas. Vi har visat att vad som i en tid och i ett rum är ’värdigt’ eller ett ’värdigt boendet’ diskursivt, materiellt och organisatoriskt, översätts i andra tider och andra rum varigenom begreppets innebörd och praktik förändras. 

  • 13396.
    Åström, Fredrik
    Blekinge Institute of Technology, School of Computing.
    Neural Network on Compute Shader: Running and Training a Neural Network using GPGPU2011Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    In this thesis I look into how one can train and run an artificial neural network using Compute Shader and what kind of performance can be expected. An artificial neural network is a computational model that is inspired by biological neural networks, e.g. a brain. Finding what kind of performance can be expected was done by creating an implementation that uses Compute Shader and then compare it to the FANN library, i.e. a fast artificial neural network library written in C. The conclusion is that you can improve performance by training an artificial neural network on the compute shader as long as you are using non-trivial datasets and neural network configurations.

  • 13397.
    Åverling, Denise
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Persson, Karin
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Anhörigas upplevelser av att vårda en familjemedlem med Alzheimers sjukdom: En litteraturstudie2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 13398.
    Öberg, Hjalmar
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Performance evaluation of a simplified FEM-tool for designers.2008Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    On today’s competitive market it is important to analyse and optimise product performance. The finite element method is a very common tool to do so when dealing with stress analysis. There are many different commercial finite element software available on the market. They range from complex ones needing special skills for proper use to more easy to use aimed at design engineers with little experience of the finite element method. The latest versions of Autodesk Inventor include a stress analysis tool that falls under the second category (easy to use). The analysis tool of Inventor is only able to perform a few types of analysis, and the user control is limited. The question is how well this tool works. What are its strengths and weaknesses? This thesis aimed to answer those questions. This was done by analysing a few “benchmarks”. Some of the analysed parts are just made up for this thesis, but most of them are provided by Water Jet Sweden AB, and are typical parts from a water jet cutting machine. These benchmarks has been thoroughly tested using both modal and stress analysis. The results from Inventor have then been compared with analysis results from I-deas, a well known commercial finite element software. The aim of these tests is not to see how close to reality Inventor gets, but if it gets a result close to a more advanced FE-tool. Depending on the benchmark different results is presented. For the larger parts and for the beams both stress and modal analysis are made, and the first six modes are presented. The deflection/deformation is shown for most benchmarks and equivalent/von Mises stress is shown for all. It is shown that the analysis tool in Inventor works fine when it comes to small and/or simple parts. Furthermore it is very easy to use compared with I-deas, although the solving time sometimes is rather long for big parts. A few problems do however exist. The main problem is that if the difference between the smallest and largest dimension in the part is big, the part cannot be meshed. This problem occurred mainly on benchmarks including long beams. The conclusion of this work is that as long as one can mesh the part fairly good results are attained. It may take a long time to solve, but one can trust the result.

  • 13399.
    Öberg, Marie-Louise
    et al.
    Blekinge Institute of Technology, School of Technoculture, Humanities and Planning.
    Berg, Nina Pisto
    Blekinge Institute of Technology, School of Technoculture, Humanities and Planning.
    Urban living rooms in Duncan Village: a project focusing on public space2005Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    In September 2004 we left Sweden for South Africa where we in the township of Duncan Village, East London had situated our diploma work with a focus on public space. It was possible for us to do so after receiving a scholarship from SIDA, the Swedish International Development Cooperation Agency. The general aim of our project has been to suggest ways on how to upgrade public spaces, and thereby support and improve the urban social life in Duncan Village, East London. The work has been done in line with the Duncan Village Local Spatial Development Framework (LSDF), a redevelopment program set up by Buffalo City Municipality, with the aim of solving the housing shortage in the area, and along with this improve the social and economical conditions for the residents. Public spaces which have such a large impact on the social conditions and the physical environment of urban areas, have due to the apartheid planning been neglected both in Duncan Village, East London and many other South African cities. Duncan Village has the urban qualities of density and interaction of people in movement but there is no real arena for the public life. We have therefor outlined a suggested for an overall structure of public space. It is based on an inventory showing weaknesses and threnghts in the existing city structure and an analysis functioning as a tool for understanding where, and in what way public activities are conducted. We have also taken the current redevelopment plans of Duncan Village into consideration by trying to envision how they could affect the future structure and use of public spaces. The proposal suggests how the network of public spaces could be complemented and developed, and by this offer better opportunity for social interaction as well as commercial-, public- and transport facilities, along with housing and parks. Two areas/nodes have been chosen for individual detailed studies resulting in design plan proposals for those. The main definition of a public space is obviously that it is not private, but when it comes to further understanding the role it plays in the urban life, and what to consider when planning it, there are several ideas. We have attracted attention to a few aspects that have been significant in our work: Rob Krier - Urban space: Public space should be clearly defined and planned urban space where the boundaries between private and publicare easily understood. Christopher Alexander -The concept of linearity: An appropriate concept for Duncan Village since the main public activities are already today concentrated along a central spine; the Douglas Smit Highway. Bill Hillier - Integration in the urban grid: Accessibility and through-movement which are both spatial and functional effects of integration are crucial for the usage of public space. Howard Besser - Artificial public space: Car orientated spaces as shopping centers outside the city core often exclude the poorer parts of the population. In the redevelopment of Duncan Village we consider it important to provide public spaces accessible to all of its residents. Jan Gehl - The discussion of quality and function: To obtain functional public spaces of high quality the planning method must be: first life, then spaces, then buildings. Gehl divides activities conducted in public space into three categories: necessary, optional and social activities. This division functions as a tool when observing life in public spaces. Following planning principles have also been important for our plan proposals: Crime prevention: Safety is one of the main concerns when developing public spaces in Duncan Village. Public spaces must allow interaction but also ensure that the spaces are defensible. Discouragement of land invasion: Degradation, occupation by informal dwellings and other “non-public” uses originally not intended for public spaces could be prevented if they are developed with a clear public purpose and if there is a mutual concern for them. Diversity and multi-functionality: Close proximity of the private and public spheres makes public spaces welcoming and private dwellings convenient. Diversity in space also supports economic activity. Flexibility and multi-functionality is important when investing in new developments where the cost is crucial. Public open spaces should be able to accommodate a range of activities with change in intensity and changing use over time. An analys method, a pulse measurement, based on Alexander’s idea of linearity and Gehl’s three categories of activities (necessary, optional or social activities) has functioned as a tool for visual observations of where public activities are most frequent and how they are conducted. We have chosen Douglas Smit Highway which runs centrally through Duncan Village as our research area. The method has helped us to understand where developments or improvements of public spaces are best located. In our proposal for the overall structure of public spaces we have chosen to put our main focus on the environment along Douglas Smit Highway which is the artery linking the area. We suggest a mixture of public spaces with differences in intensity and character to increase movement and thereby interaction of people. We also suggest the upgrading of existing pedestrian paths and the development of new pedestrian connections, giving a structure that increases the accessibility between neighbourhoods and the public places. The areas chosen for detailed studies are of different character, illustrating how public spaces focusing on different uses can be developed and used. The first area includes Gwentsha Memorial Garden, an old burial site, and the site for the Community Hall, showing how these can be upgraded and linked. The area is intended to become a space for optional and recreational activities, a centre of cultural activity. The second area, a plan proposal for the Jabavu node, is taught to be a everyday urban space for intense necessary activities. The area is ment to provide for a civic centre and other public facilities, as well as market places and public spaces for commercial activities and community happenings.

  • 13400. Ödling, Per
    Design and Analysis of Digital Receivers1995Doctoral thesis, comprehensive summary (Other academic)
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