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  • 251. Rakus-Andersson, Elisabeth
    et al.
    Salomonsson, Maria
    Zettervall, Hang
    Two-Player Games with Fuzzy Entries of the Payoff Matrix2008Conference paper (Refereed)
    Abstract [en]

    We expand the classical model of a two-player game by inserting of fuzzy sets as payoff values in the game matrix. Players can thus formulate their payoff expectations with words instead of deciding on numerical entries of the matrix. In this way we count on the better verbal communication between players when designing the preliminaries of the game. As a final result we expect to obtain samples of the players’ optimal strategies, which will preserve the profit of the game on the neutral level.

  • 252.
    Rakus-Andersson, Elisabeth
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Tan, Lujiao
    Type 1 Fuzzy Sets in Complex Control Applied to Evaluation of Resort Management System2013Conference paper (Refereed)
    Abstract [en]

    The evaluation of Resort Management System (RMS) quality is an item of many trials. We propose applying a complex system of two control algorithms to provide a final estimation of RMS. This distinct quality value will be dependent on some individual appreciations assigned by customers to basic services. We also discuss some improvements concerning the fuzzification parts of controllers.

  • 253. Rakus-Andersson, Elisabeth
    et al.
    Yager, Ronald R.Ichalkaranje, NikhilJain, Lakhmi C.
    Recent Advances in Decision Making2009Collection (editor) (Other academic)
    Abstract [en]

    The series Studies in Computational Intelligence (SCI) publishes new developments and advances in the various areas of computational intelligence – quickly and with a high quality. The intent is to cover the theory, applications, and design methods of computational intelligence, as embedded in the fields of engineering, computer science, physics and life science, as well as the methodologies behind them. The series contains monographs, lecture notes and edited volumes in com putational intelligence spanning the areas of neural networks, connectionist systems, genetic algorithms, evolutionary computation, artificial intelligence, cellular automata, self-organizing systems, soft computing, fuzzy systems and hybrid intelligent systems. Critical to both contributors and readers are the short publication time and world-wide distribution – this permits a rapid and broad dissemina tion of research results. springer.com Intelligent paradigms are increasing finding their ways in the design and development of decision support systems. This book presents a sample of recent research results from key researchers. The contributions include: • Introduction to intelligent systems in decision making • A new method of ranking intuitionistic fuzzy alternatives • Fuzzy rule base model identification by bacterial memetic algorithms • Discovering associations with uncertainty from large databases • Dempster-Shafer structures, monotonic set measures and decision making • Interpretable decision-making models • A General methodology for managerial decision making • Supporting decision making via verbalization of data analysis results using linguistic data summaries • Computational intelligence in medical decisions making This book is directed to the researchers, graduate students, professors, decision makers and to those who are interested to investigate intelligent paradigms in decision making.

  • 254. Rakus-Andersson, Elisabeth
    et al.
    Zettervall, Hang
    Different Approaches to Operations on Continuous Fuzzy Numbers2008In: Intuitionistic Fuzzy Sets and Generalized Nets / [ed] J., Kacprzyk; E., Szmidt, Warszawa: EXIT Publishing House , 2008Chapter in book (Refereed)
    Abstract [en]

    The work is particularly addressed to some beginners in performing operations on continuous fuzzy numbers. We discuss three different approaches to operations on fuzzy numbers to make comparisons of results in the aspect of their advantages and disadvantages. By demonstrating different possibilities of making calculations on fuzzy numbers we intend to help users in the proper selection of such operators that are adapted to their tasks in the most adequate way.

  • 255.
    Rakus-Andersson, Elisabeth
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Zettervall, Hang
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Fuzzified Clustering and Point Set Continuous Approximation in Prognosticating Gastric Cancer Surgery2014Conference paper (Refereed)
    Abstract [en]

    We discuss two computational techniques in the current paper. In the first part, we aim at employing FCM (fuzzy c-means) clustering to compute membership degrees of two clusters providing decisions to perform surgery or not for a testing set of 25 gastric cancer patients. The second part handles mathematical modelling of a common function approximating the information obtained from the c-means procedure. After constructing the equation of the function, we can make the decision about the surgery in the form of the surgery degree for an arbitrary gastric cancer patient. A centre, dealing with mathematical techniques concerning surgery prognoses, can quickly decide about surgery for the patient who lives in a remote place. A transmission of information among the centre and some hospitals, interested in adopting the centre services, can facilitate surgery decision-making. This trial can be treated as a contribution in the telemedicine domain.

  • 256.
    Rakus-Andersson, Elisabeth
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Science.
    Zettervall, Hang
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Science.
    Erman, Maria
    Blekinge Institute of Technology, School of Engineering, Department of Signal Processing.
    Prioritisation of weighted strategies in multiplayer games with fuzzy entries of the payoff matrix2010In: International Journal of General Systems, ISSN 0308-1079, E-ISSN 1563-5104, Vol. 39, no 3, p. 291-304Article in journal (Refereed)
    Abstract [en]

    We explore the classical model of a two-player game to select the best strategies, where action is expected to maintain the values of a certain variable on the neutral level. By inserting fuzzy sets as payoff values in the game matrix, we facilitate the procedure of formulations of payoff expectations by players. Instead of making inconvenient decisions about the choice of accurate numerical entries of the matrix, the players are able to use words, which should simplify communication between them when designing the preliminaries of the game. The players also have the possibility of making a ranking of their favourite strategies. At the next stage of the play, we involve group decision-making in order to aggregate results coming from several paired games, when more than two players contradict each other.

  • 257. Rakus-Andersson, Elisabeth
    et al.
    Zettervall, Hang
    Forssell, Henrik
    Fuzzy Controllers in Evaluation of Survival Length in Cancer Patients2011In: Recent Advances in Fuzzy Sets, Intuitionistic Fuzzy Sets, Generalized Nets and Related Topics. Volume II: Applications / [ed] Atanassov, K.; Homenda, W.; Hryniewicz, O.; Kacprzyk, J.; Krawczak, M.; Nahorski, Z.; Szmidt, E.; Zadrozny, S., Warsaw, Poland: System Research Institute, Polish Academy of Sciences , 2011, p. 203-222Chapter in book (Refereed)
    Abstract [en]

    Strict analytic formulas are the tools usually derived for determining the formal relationships between a sample of independent variables and a variable which they affect. If we cannot formalize the function tying the independent and dependent variables then we will utilize some control actions. Apart from crisp versions of control we often adopt their fuzzy variants developed by Mamdani and Assilian or Sugeno. Fuzzy control algorithms are furnished with softer mechanisms, when comparing them to classical control. The algorithms are particularly adaptable to support medical systems, often handling uncertain premises and conclusions. From the medical point of view it would be desirable to prognosticate the survival length for patients suffering from gastric cancer. We thus formulate the objective of the current paper as the utilization of fuzzy control actions for the purpose of making the survival prognoses.

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

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

  • 259. Rudenko, Oleg
    Giant nonlinearities in structurally inhomogeneous media and the fundamentals of nonlinear acoustic diagnostic techniques2006In: Physics Uspekhi, ISSN 1063-7869, E-ISSN 1468-4780, Vol. 49, no 1, p. 69-87Article, review/survey (Refereed)
  • 260.
    Rudenko, Oleg
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering. Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Hedberg, Claes
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering. Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Science. Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering. Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences. Blekinge Institute of Technology, Department of Telecommunications and Mathematics.
    A new equation and exact solutions describing focal fields in media with modular nonlinearity2017In: Nonlinear dynamics, ISSN 0924-090X, E-ISSN 1573-269X, Vol. 89, no 3, p. 1905-1913Article in journal (Refereed)
    Abstract [en]

    Brand-new equations which can be regarded as modifications of Khokhlov–Zabolotskaya–Kuznetsov or Ostrovsky–Vakhnenko equations are suggested. These equations are quite general in that they describe the nonlinear wave dynamics in media with modular nonlinearity. Such media exist among composites, meta-materials, inhomogeneous and multiphase systems. These new models are interesting because of two reasons: (1) the equations admit exact analytic solutions and (2) the solutions describe real physical phenomena. The equations model nonlinear focusing of wave beams. It is shown that inside the focal zone a stationary waveform exists. Steady-state profiles are constructed by the matching of functions describing the positive and negative branches of exact solutions of an equation of Klein–Gordon type. Such profiles have been observed many times during experiments and numerical studies. The non-stationary waves can contain singularities of two types: discontinuity of the wave and of its derivative. These singularities are eliminated by introducing dissipative terms into the equations—thereby increasing their order. © 2017 The Author(s)

  • 261.
    Rudenko, Oleg
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Sobisevich, A. L.
    Sobisevich, L.E.
    Hedberg, Claes
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Shamaev, N. V.
    Nonlinear model of a granulated medium containing viscous fluid layers and gas cavities2012In: Acoustical Physics, ISSN 1063-7710, E-ISSN 1562-6865, Vol. 58, no 1, p. 99-106Article in journal (Refereed)
    Abstract [en]

    We analyze nonlinear oscillations and waves in a simple model of a granular medium containing inclusions in the form of fluid layers and gas cavities. We show that in such a medium, the velocity of one of the wave modes is low; therefore, the nonlinearity is high and the effects of interaction are more strongly expressed than usual.

  • 262. Smirnova, Tatiana
    et al.
    Åkesson, Henrik
    Claesson, Ingvar
    Håkansson, Lars
    Lagö, Thomas L
    Modeling a Clamped Boring Bar using Euler-Bernoulli Beam Models with Various Boundary Conditions2009Conference paper (Refereed)
    Abstract [en]

    This paper addresses modeling of a clamped boring bar using Euler-Bernoulli beam theory. Euler-Bernoulli beams with a number of different boundary conditions were used to model a clamped boring bar. Estimates of the boring bar's natural frequencies and mode shapes were produced with each of the boring bar models. The estimates produced by the distributed-parameter system models are compared with eigenfrequencies and mode shapes estimated based on experimental modal analysis of the actual boring bar clamped in a lathe.

  • 263. Smirnova, Tatiana
    et al.
    Åkesson, Henrik
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Identification of Spatial Dynamic Properties of the Boring Bar by Means of Finite Element Model: Comparison with Experimental Modal Analysis and Euler-Bernoulli Model2006Conference paper (Refereed)
    Abstract [en]

    In metal cutting the boring operation is known to be one of the most troublesome regarding vibration. Boring bars are frequently subjected to vibrations originated from the load applied by the workpiece material deformation process. These vibrations are easily excited due to the boring bars general geometric dimensions, i.e. large length to diameter ratio. Large overhang is usually required to perform internal boring operation and is a consequence the vibration may frequently reach extremely high levels, which result in a poor surface finish, reduced tool life and annoying noise level in the working environment. The vibration problem is directly related to the first bending modes of a boring bar. Therefore investigations of the boring bar’s spatial dynamic properties are of a great importance. The results from experimental modal analysis show that a conventional analytical approach - calculation of boring bar eigenfrequencies using an Euler-Bernoulli model - results in rough estimates. This can be explained by existing nonlinearities introduced e.g. in the areas of contact between the boring bar and the clamping bolts as well as the clamping house, which is not considered in the analytical model where the boring bar instead is assumed to be rigidly clamped. Therefore the estimation of the eigenfrequencies and eigenmodes of a boring bar based on a 3-D finite element model of the clamped boring bar incorporating contact between the bar and the bolts respective the clamping house is a more beneficial strategy. This paper addresses the estimation of the boring bar’s first eigenfrequencies and corresponding eigenmodes based on the 3-D finite element model. The results are compared with results obtained both from experimental modal analysis and an analytical Euler-Bernoulli model.

  • 264. Smirnova, Tatiana
    et al.
    Åkesson, Henrik
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Investigation of Boring Bar Mode Shape Rotation by Experimental Modal Analysis in Correlation with Finite Element Modeling2006Conference paper (Refereed)
    Abstract [en]

    Productivity degrading vibration problems are traditional in metal cutting, in particular in internal turning, when the boring bar is long and slender. The high levels of vibrations arise at the boring bar’s natural frequencies corresponding to its fundamental bending modes. The vibrations are dominating at the boring bar’s eigenfrequency in the cutting speed direction, since the cutting force has the largest component in this direction. The negative effects of vibrations, e.g. poor surface finish, reduced tool life, high sound pressure levels in the working environment etc., can be eliminated for instance by using passive tuned damper or active control. The level of success implementing any of these methods is dependent on the knowledge of the dynamic properties of tooling structure - the interface between the cutting tool or insert and the machine tool - involved. Results from experimental modal analysis on the boring bar clamped in a lathe reveal a rotation of the mode shapes with respect to the cutting speed and cutting depth direction. The paper addresses boring bar mode shape rotation phenomenon and discusses its possible sources based on results obtained from experimental modal analysis of two systems: boring bar with original boundary conditions and boring bar with linearized boundary conditions in correlation with results obtained from corresponding 3-D finite element models.

  • 265. Suksern, Supaporn
    et al.
    Meleshko, Sergey
    Ibragimov, Nail H.
    Criteria for fourth-order ordinary differential equations to be linearizable by contact transformations2009In: Communications in nonlinear science & numerical simulation, ISSN 1007-5704, E-ISSN 1878-7274, Vol. 14, no 6, p. 2619-2628Article in journal (Refereed)
    Abstract [en]

    Solution of linearization problem of fourth-order ordinary differential equations Via contact transformations is presented in the paper. We show that all fourth-order ordinary differential equations that are linearizable by contact transformations are contained in the class of equations which is at most quadratic in the third-order derivative. We provide the linearization test and describe the procedure for obtaining the linearizing transformations as well as the linearized equation. Moreover, we obtain the general form of ordinary differential equations of order greater than four linearizable via contact transformations. (C) 2008 Elsevier B.V. All rights reserved.

  • 266.
    Sutter, Berthel
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    A new kind of societal knowledge creation?2007In: Von Umgang mit Differenz. Globalisierung and Regionalisierung im interkulturellen Diskurs / [ed] Fichtner, Maria Benites & Bernd, ATHENA-Verlag , 2007, p. 241-256Chapter in book (Refereed)
    Abstract [en]

    The chapter outlines some theoretical and practical implications for “joint ventures” by re-thinking learning as an activity-transforming activity. In addition, it presents a “joint-venture” project in some detail. Finally, it briefly explains what it means, as stated in the title, that there might be a new kind of knowledge production that goes beyond individual projects and makes up a societal creation of knowledge. And here higher education is the key. It is suggested that, when suitably organised, university students might form a mighty R&D resource, which is tremendously underestimated today. For example, the students could be organised as parts of research teams, which in turn could participate in joint ventures of interaction research - or in some other way that enables them to make contributions to research, to artefact development and to the development of work activities. In short: manpower intensive research.

  • 267. Sutter, Berthel
    Taking artefacts seriously. A case of angio diagnostics2007Conference paper (Refereed)
    Abstract [en]

    Within the CHAT community there is an ongoing discussion about the concept of activity (Gegenständliche Tätigkeit). How is activity to be understood, what are its core related concepts, how to delimit it, what is its ”unit” and its relations to actions and strings of actions, is it applicable to individuals as well as collectives - these are some of the questions posed and debated. The paper is intended as a contribution to this discussion on activity. My entrance to the discussion will be to focus on how artefacts are transformed in the course of collaborative work at an angio clinic. Thus, in the paper my practical point of departure is a detailed empirical case of the construction and use of a central artefact at clinical coronary diagnostic work. The artefact is called angiography (”angio” in everyday talk of the participants). The angio is an x-ray based visualization of the coronaries as the outcome of the injection of a radiopaque substance. The angio is constructed in several steps. First, a digital computer-based representation is constructed, then it is reconstructed, added on, and transformed into paper format. It is (re)designed for several situations and audiences, for individual and joint consultations. The case I will present accounts for the full cycle of the patient angiography, from its production and uses until the patient is considered having got a final diagnosis and a treatment recommendation. A predominant theme of CHAT discussions about the motivating role of the object of activity has been the motive of the individual. This is a legitimate psychological perspective. As I grasp it, it is a stance that takes precautions to preserve the individual subject´s role in activities, putting agency in individual subjects and not in ”systems” of any kind. My perspective will be different. The focus is the object of activity as a motive of the collaborative work. It is a motive guiding the overall work process, ”keeping the activity of work together” so to say. I take for granted that this overall motivation, related to the object of work, ”in some way” influences the participants individual motivations as well. (I do not address how this works.) Agency is about actions of human beings. However, in the paper I argue that it is reasonable to talk about agency related not only to live actions, but to ”fossiled” human activity as well. At least, there is a potential agency-character in artefacts (”by the agency of”). This is a corollary to the artefact-mediatedness of activities. By the agency of certain artefacts, some activities are being enabled. Without earlier generations´ generating of artefacts that we now can use, today´s activities wouldn´t exist. A major argument in the paper is that artefacts are instructive, and that they are instructive because they are made instructive. There is a stamp of human activity on artefacts, a stamp that is recognizeble as distinctively human. (This is the ”ideal object”, in my reading of Ilyenkov, an ”ideality” that is ”built-in” into every artefact.) The core of the work activity at the angio lab can be described as the design and redesign of angio graphic artefacts. In other words, in their work practice the Thorax team has to take, and takes, artefacts seriously. I suggest that we as researchers of their labor have to do the same thing in order to make their work visible and improve our activity-theoretical understanding of what is going on when the job gets done.. An often used characteristic of activity by CHAT scholars is that activities are ”artefact-mediated and object-oriented.” The conclusion of the paper is that if we better want to understand the artefact-mediatedness and the object-orientedness of activities, we have to take artefacts more seriously than most of us have done so far. In sum, the arguments of the paper are: 1. Artefacts are instructive, and the reason why they embody this feature is that they are designed to be instructive. 2. Artefacts are ideal as well as material/corporeal. 3. There is a certain form of agency related to artefacts (although not symmetrical to human agency). 4. The object of activity ”keeps the activity together” by being collectively motivational. 5. There is a need to take artefacts more seriously in studies by CHAT scholars.

  • 268. Sällberg, Benny
    et al.
    Sattar, Farook
    Claesson, Ingvar
    On a Method for Improving Impulsive Sounds Localization in Hearing Defenders2008In: EURASIP Journal on Audio, Speech, and Music Processing, ISSN 1687-4714, E-ISSN 1687-4722, Vol. 2008, p. 1-7Article in journal (Refereed)
    Abstract [en]

    This paper proposes a new algorithm for a directional aid with hearing defenders. Users of existing hearing defenders experience distorted information, or in worst cases, directional information may not be perceived at all. The users of these hearing defenders may therefore be exposed to serious safety risks. The proposed algorithm improves the directional information for the users of hearing defenders by enhancing impulsive sounds using interaural level difference (ILD). This ILD enhancement is achieved by incorporating a new gain function. Illustrative examples and performance measures are presented to highlight the promising results. By improving the directional information for active hearing defenders, the new method is found to serve as an advanced directional aid.

  • 269. Søilen, Klaus Solberg
    et al.
    Huber, Stefan
    Berglunds Mekaniska AB2004Other (Other academic)
    Abstract [en]

    Abstract: Being a small company within the metal industry, Berglunds Mekaniska AB, located in Löddeköpinge/South Sweden, faces a lot of the typical problems of the branch. The metal industry is a low tech segment. The problems become particularly clear in smaller companies. Many of these companies lack even a clear vision of the firm’s future. Few have developed a strategy. An immediate consequence is that these companies are more vul-nerable to change in demand as they find themselves at the mercy of a small local market. The mechanical industry has traditionally been considered to be con-servative. With increased competition the acquisition of new knowledge has become a necessity. Smaller companies like Berglunds are increasingly de-pending upon outside help for their survival. With the case of Berglunds, an external business consultant has showed how both administration and lead-ership have been run ineffectively. These problems are to be improved suc-cessively by continuously coaching the CEO/owner and the staff. The coach-ing process is planned to be maintained for a longer period of time.

  • 270. Søilen, Klaus Solberg
    et al.
    Huber, Stefan
    Bräcke Trähuskomponenter AB2004Other (Other academic)
    Abstract [en]

    Bräcke Trähuskomponenter AB kämpar fortfarande för att gå med vinst. Ännu så länge har man inte uppnått en resultatnivå som är lönsam. Därför har man bett länsstyrelsen om utvecklingsstöd, vilket man emellertid nekats flera gånger. – Det är mycket upprörande, säger Viktoria Eriksson. Enligt egna utsagor har länsstyrelsen pengar för att främja företag i vår situation, men de gör det inte så länge vi skriver röda siffror. Detsamma gäller banker som bara lånar ut när man redan går med vinst. Det är ett ”Moment 22”. Hennes försök att vända sig till högre instanser, som t.ex. en medarbetare till infrastrukturminister Ulrica Messing, har visserligen lett till mer uppmärksamhet för hennes situation, men förutom att hon uppnått en ökad förståelse har det inte hänt så mycket. – Bidragsgivarna har den policyn att de bara hjälper redan blomstrande företag. Det oförståeliga i vårt fall är att det skulle handla om en ganska liten summa på ca 200 000 kronor. Det är egentligen småpengar för dessa organisationer. På grund av den allmänt osäkra situationen vågar ledningen heller inte satsa för mycket på nyinköp av maskiner eller lokaler: – Vi vet t. ex. att vi befinner oss i olämpliga lokaler och skulle gärna vilja flytta. Men i dagsläget är det inte aktuellt. Inom Bräcke kommun finns det inga andra industrilokaler som passar oss och att bygga eget är inte rimligt mot bakgrund av våra finansiella resurser. Det finns även andra delar inom produktionsprocessen som kunde effektiviseras, men som tills vidare inte kan förändras. Man skulle t. ex. vilja övergå till ett slags produktion på löpande band för att minska onödiga stoppmoment i produktionsförloppet. Men för att förändra produktionen på det sättet krävs det en finansiell satsning. Å andra sidan försöker man skära ner på alla tänkbara kostnader för att kunna uppnå bättre resultat. Men möjligheterna till kostnadsreduktion är begränsade.

  • 271. Toft, Joachim
    Continuity Properties for Modulation Spaces, with Applications to Pseudo-differential Calculus-I2004In: Journal of the Functional Analysis, ISSN 0022-1236 , Vol. 207, no 2, p. 399-429Article in journal (Refereed)
    Abstract [en]

    Let M-p,M- q denote the modulation space with parameters p, q is an element of [1, infinity]. If 1/p(1) + 1/p(2) = 1 + 1/p(0) and 1/q(1) + 1/q(2) = 1/q(0), then it is proved that M-p1,M- q1 * M-p2,M- q2 subset of M-p0,M- q0. The result is used to get inclusions between modulation spaces, Besov spaces and Schatten classes in calculus of psido (pseudo-differential operators), and to extend the definition of Toeplitz operators. We also discuss continuity of ambiguity functions and psido in the framework of modulation spaces.

  • 272. Torsti, T
    et al.
    Lindberg, Vanja
    Real-space electronbic-property calculations for nano-scale structure2006In: Handbook of Theoretical and Computational Nanotechnology, edited by Michael Rieth and Wolfram Schommers, American Scientific Publishers , 2006, p. 771-795Chapter in book (Other academic)
  • 273.
    Vu, Viet Thuy
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences. Blekinge Institute of Technology, School of Engineering, Department of Signal Processing. Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences. Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Pettersson, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    thomas, Sjögren
    Swedish Defence Research Agency, SWE.
    Moving Target Focusing in SAR Image with Known Normalized Relative Speed2017In: IEEE Transactions on Aerospace and Electronic Systems, ISSN 0018-9251, E-ISSN 1557-9603, Vol. 53, no 2, p. 854-861Article in journal (Refereed)
    Abstract [en]

    This paper presents the moving target focusing method, whichallows focusing moving targets in complex synthetic aperture radar(SAR) images without raw data. The method is developed on the rangemigration algorithm, where focusing moving target is an interpolationstep in the wave domain. The simulated results are provided in thepaper to illustrate the proposed method whereas the experimentalresults show its practicality. The method can be flexibly applied fromsmall area to the whole SAR scene.

  • 274.
    Vu, Viet Thuy
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Sjögren, Thomas
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Pettersson, Mats
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    On Synthetic Aperture Radar Spatial Azimuth and Range Resolution Equations2012In: IEEE Transactions on Aerospace and Electronic Systems, ISSN 0018-9251, E-ISSN 1557-9603, Vol. 48, no 2, p. 1764-1769Article in journal (Refereed)
    Abstract [en]

    This paper discusses spatial resolutions for narrowband narrowbeam (NB) synthetic aperture radar (SAR) as well as for ultrawideband ultrawidebeam (UWB) SAR. The similarity and difference between the impulse response function in NB SAR imaging (IRF-NSAR) - sinc function - and the impulse response function in UWB SAR imaging (IRF-USAR) is investigated and the result of this investigation shows that in the intensity interval from −6 dB to 0 dB, the behavior of IRF-NSAR and IRF-USAR in azimuth and range are similar. This is the basis for a derivation of new spatial resolution equations for UWB SAR based on −3 dB width or half power beamwidth (HPBW). The investigated result also shows that there exists the so-called HPBW narrowing/broadening factor in an IRF-USAR.

  • 275.
    Vu, Viet Thuy
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Sjögren, Thomas
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Pettersson, Mats
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    SAR Imaging in Ground Plane Using Fast Backprojection for Mono- and Bistatic Cases2012Conference paper (Refereed)
    Abstract [en]

    The paper discusses the possibilities to reconstruct an illuminated Synthetic Aperture Radar (SAR) scene in a ground plane instead of a slant-range plane using Fast Backprojection (FBP) algorithm. Hence, two methods to reconstruct a SAR scene in a ground plane are introduced in this paper. The methods are then considered to be extended for bistatic cases where the formation of a SAR scene in a ground plane is highly recommended. The proposals are examined with simulated SAR data and the simulation results indicate that rebuilding a SAR scene in a ground plane using FBP is possible.

  • 276. Wihlborg, Monne
    Quality in internationalizing Higher Education – a pedagogical issue must be addressed from a pedagogical perspective2006Conference paper (Refereed)
    Abstract [en]

    Wihlborg, M: “Quality in internationalizing Higher Education – a pedagogical issue must be addressed from a pedagogical perspective.” At the International Conference: The transforming of Higher education: International Influences, 20-22 November, 2006, Université du Littoral Cote d’Opal (ULCO), Boulogne-sur-Mer, France.

  • 277. Winberg, Mathias
    Noise and Vibration Control of Combustion Engine Vehicles2005Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Noise and vibrations have over the last two decades been regarded as significant environmental health problems. Regulations regarding acoustic as well as vibration levels have therefore become more stringent. This thesis embraces two different techniques to reduce unwanted noise and vibrations, spectral subtraction and active noise and vibration control. The applications treated for noise and vibration problems are mainly means of transportation driven by combustion engines as for example, helicopters, boats, and cars. All these vehicles have low-frequency noise and vibration problems which are difficult to solve by means of passive isolation, hence alternative methods must be sought. Two different scenarios are studied. First, the high noise level in the interior of the vehicle is accepted and the humans inside are equipped with headsets utilizing both passive as well as active noise control. If the means of transportation employs some kind of communication equipment, such as for a cellular telephone or an intercom radio, the noisy speech signal picked up by the microphone is cleansed by spectral subtraction, which is a non-linear filtering method employed in the frequency domain. In the second scenario the entire interior of the vehicle is subjected to noise and vibration reduction by means of active noise and vibration control. Active noise and vibration control is the art of reducing a primary sound or vibration field by interference with a secondary anti-field. The thesis focus on real-life applications which implies that a lot of measurements and practical difficulties must be treated for both scenarios, especially in the area of active noise and vibration control. In this area, the basic idea seems straight-forward, but implementing it in large and complex structures, such as vehicles, is extremely difficult, in particular if high attenuation is required.

  • 278. Yang, Zhe
    et al.
    Mohammed, Abbas
    Hult, Tommy
    Uplink Performance Evaluation of WiMAX Broadband Services via High Altitude Platforms (HAPs)2007Conference paper (Refereed)
  • 279. Zackrisson, Johan
    et al.
    Gustavsson, Ingvar
    Håkansson, Lars
    An Overview of the VISIR Open Source Software Distribution 20072007Conference paper (Refereed)
    Abstract [en]

    This paper is intended for people who are interested in creating online laboratories. Blekinge Institute of Technology (BTH) in Sweden has started a project known as VISIR (Virtual Instrument Systems in Reality) together with National Instruments in USA and Axiom EduTech in Sweden to disseminate an online laboratory concept created at BTH using open source technologies in collaboration with other universities and organisations. The VISIR open source distribution 2007 includes software for two implemented examples, one laboratory for low frequency electronics and one for signal processing. The distribution is modular and many modules can be used for other online laboratories. The goal is an international standard, enabling teams worldwide to expand and jointly develop this powerful approach into distributed online laboratories. Each laboratory is a client/server application controlled by an administrative system. These three parts are mainly written in Adobe Flash, C++, and PHP respectively. However, the hardware control module of the equipment server is written in LabVIEW. This paper describes the organisation of the software.

  • 280. Zettervall, Hang
    Fuzzy and Rough Set Theory in Treatment of Elderly Gastric Cancer Patients2011Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Fuzzy set theory was presented for the first time by Professor Lotfi A. Zadeh from Berkeley University in 1965. In conventional binary logic a statement can be true or false, and there is no place for even a little uncertainty in this judgment. An element either belongs to a set or does not. We call these kinds of sets crisp sets. In practice we often experience those real situations that are represented by crisp sets as impossible to describe accurately. A two-valued logic assumes that precise symbols must be employed, and it is therefore not applicable to the real existence. If the information demanded by a system is lacking, the future state of such a system may not be known completely. One of the instruments used to handle the vagueness in the real-world situations is fuzzy set theory, which has been frequently applied in a wide range of areas like, e.g., dynamic systems, militaries, medicine and other domains. Another theory, which copes with the problem of imprecision, is known as rough set theory. It was proposed by Professor Zdzisław Pawlak in Warsaw in the 1980ties. Whereas imprecision is expressed in the category of a membership degree in fuzzy set theory, this is a matter of the set approximation in rough set theory. Due to the definition of a rough set formulated by means of the decision attribute value, two approximate sets of the rough set are determined. These contain sure and possible members of the universe considered, in which the rough set has been defined. One of the objectives of this study is to apply some classical methods of fuzzy set theory to medicine in order to estimate the survival length of gastric cancer patients. We have decided to test the action of fuzzy controllers of the Mamdani and Sugeno type. Two clinical markers, playing roles of the independent variables, have been included in the algorithm as the base information assisting the survival prognosis. Since the model results have been convergent to the expected experimental values then we will intend to make some extensions of the model concerning the larger number of independent variables. We have also utilized rough set classification, to verify the types of operations. These items are discussed in the thesis in conformity with the physicians’ wishes to support results of statistical investigations. The current research is funded by the scientific grant obtained from Blekinge Research Board.

  • 281.
    Zettervall, Hang
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Rakus-Andersson, Elisabeth
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Forssell, Henrik
    Applied Fuzzy C-means Clustering to Operation Evaluation for Gastric Cancer Patients2013Conference paper (Refereed)
    Abstract [en]

    Like data analysis, pattern recognition and data mining, fuzzy clustering also has been applied widely, and successful applications have been reported. In this paper we aim to employ the technique of fuzzy c-means (FCM) cluster to prognosticate the operation possibility on gastric cancer patients. Our purpose is to partition some clinical data in two fuzzy clusters. One of them considers patients who have a chance for successful surgery whereas the other cluster contains the patients without a view for surgery. Each patient is given by characteristic biological markers. The initial values of membership degrees taking place in the partition matrix are usually determined randomly. In this work we will use particularly designed membership functions to calculate the degrees of membership.

  • 282.
    Zettervall, Hang
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Rakus-Andersson, Elisabeth
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Forssell, Henrik
    Fuzzy C-Means Cluster Analysis and Approximated Data Strings in Operation Prognosis for Gastric Cancer Patients2013In: New Trends in Fuzzy Sets, Intuitionistic Fuzzy Sets, Generalized Nets and Related Topics / [ed] Atanassov, Krassimir T.; Homenda, Wladyslaw; Hryniewicz, Olgierd; Kacprzyk, Janusz; Krawczak, Maciej; Nahorski, Zbigniew; Szmidt, Eulalia; Zadrozny, Slawomir, Warsaw: System Research Instituite, Polish Academy of Sciences , 2013, p. 181-200Chapter in book (Refereed)
    Abstract [en]

    The chapter is composed of two parts. In the first part we aim at employing fuzzy c-means (FCM) clustering to prognosticate membership degrees pointing out possibilities for operation and none operation for a set of 25 gastric cancer patients characterized by values of decisive biological markers. The second part handles the technique of mathematical modelling of a common membership function approximating the information collected from the given set of patients. When constructing the equation of the function we are able to determine the operation and none operation diagnosis for an arbitrary gastric cancer patient.

  • 283. Zettervall, Hang
    et al.
    Rakus-Andersson, Elisabeth
    Forssell, Henrik
    The Mamdani Controller in Prediction of the Survival Length in Elderly Gastric Patients2011Conference paper (Refereed)
    Abstract [en]

    Strict analytic formulas are the tools derived for determining the formal relationships between a sample of independent variables and a variable which they affect. If we cannot formalize the function tying the independent and dependent variables then we will utilize fuzzy control actions. The algorithm is particularly adaptable to support the problem of prognosticating the survival length for gastric cancer patients. We thus formulate the objective of the current paper as the utilization of fuzzy control action for the purpose of making the survival prognoses.

  • 284.
    Zettervall, Hang
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Rakus-Andersson, Elisabeth
    Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
    Frey, Janusz
    Applied Multi-Expert Decision Making Issue Based on Linguistic Models for Prostate Cancer Patients2013Conference paper (Refereed)
    Abstract [en]

    Abstract—In this paper, two models, one is called the probabilistic model and the other is known as the model of 2-tuple fuzzy linguistic representations, are applied to solve multi-expert decision making issues (MEDM). A MEDM problem is considered, in which a group of physicians are independently asked about assessing the effectiveness of a set of treatment therapies for a prostate cancer patient. The objective of this paper is to find the most common judgment by means of these two models. Moreover, fuzzy linguistic terms are used to express the experts’ opinions and s-parametric membership functions are designed to depict the fuzzy linguistic terms.

  • 285. Zhang, Yang-Fei
    et al.
    Bai, Shu-Lin
    Yang, Da-Yong
    Zhang, Zhong
    Kao-Walter, Sharon
    Study on the Viscoelastic Properties of the Epoxy Surface by means of Nano-Dynamic Mechanical Analysis2008In: Journal of Polymer Science Part B: Polymer Physics, ISSN 0887-6266, E-ISSN 1099-0488, Vol. 46, no 3, p. 281-288Article in journal (Refereed)
    Abstract [en]

    The viscoelastic properties of the epoxy surface have been investigated by nano-dynamic mechanical analysis (nano-DMA). Both a Berkovich tip and a conospherical tip were used under the condition of different forces (i.e. different penetration depths) in the frequency range of 10–200 Hz. Loss tangent and storage modulus are characteristics that describe the viscoelastic properties. The effect of force frequency, penetration depth and tip shape on the viscoelastic properties is studied and discussed according to the features of microstructures and mobility of molecular chains. The experimental results show important variations when the penetration depth is shallow (<30 nm). As the depth becomes deeper, the results tend to be stable and become almost constant over 120nm. The two kinds of indenter tip can cause a slight difference of the storage modulus. A “master curve” of the storage modulus as a function of force frequency is established.

  • 286. 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.

  • 287. Östlin, Erik
    et al.
    Suzuki, Hajime
    Zepernick, Hans-Jürgen
    Comparisons and Evaluation of ITU-R Recomendation P.1546 Versions2006Conference paper (Refereed)
    Abstract [en]

    In this paper, the validity of P.1546, in short range (typically less than 20km) terrestrial environment is analysed by comparing its three versions (P.1546, P.1546-1, and P.1546-2) against simple models and against measurement results obtained by utilising the pilot signal of a commercial CDMA mobile network in rural Australia. The results show that the latest version on average underestimates the field strength by more than 10 dB for typical Australian rural areas, however it improves the error standard deviation. The causes of these effects and the suggestions for further development of the Recommendation are discussed.

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