Scopus İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8651

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Publisher: search.filters.publisher.Springer-verlag Berlin

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Now showing 1 - 10 of 19
  • Conference Object
    Citation - WoS: 2
    Citation - Scopus: 5
    Throughput Maximisation of Different Signal Shapes Working on 802.16e Mobile Multihop Network Using Novel Cognitive Methods
    (Springer-verlag Berlin, 2010) Preveze, Barbaros; Safak, Aysel
    This study proposes cognitive methods for managing the multimedia packet traffic of 802.16e system providing the dynamic spectrum sharing by TDM & OFDMA under heavy traffic conditions. The cognitive techniques are used in order to maximize the throughput of a system having different signal shapes such as video, voice or data packets. All real time voice and video packets transmissions have been provided with full success where the loss rate of data packets has been minimized using the cognitive methods. By these methods buffers are managed successfully for the given parameters, optimum buffer sizes have been formulized and it's shown that we brought the throughput up to its calculated theoretical limits for multi-hop mobile wimax (802.16e).
  • Conference Object
    Citation - WoS: 1
    Citation - Scopus: 2
    Texture Segmentation Using the Mixtures of Principal Component Analyzers
    (Springer-verlag Berlin, 2003) Musa, MEM; Duin, RPW; de Ridder, D; Atalay, V
    The problem of segmenting an image into several modalities representing different textures can be modelled using Gaussian mixtures. Moreover, texture image patches when translated, rotated or scaled lie in low dimensional subspaces of the high-dimensional space spanned by the grey values. These two aspects make the mixture of local subspace models worth consideration for segmenting this type of images. In recent years a number of mixtures of local PCA models have been proposed. Most of these models require the user to set the number of subspaces and subspace dimensionalities. To make the model autonomous, we propose a greedy EM algorithm to find a suboptimal number of subspaces, besides using a global retained variance ratio to estimate for each subspace the dimensionality that retains the given variability ratio. We provide experimental results for testing the proposed method on texture segmentation.
  • Conference Object
    Citation - WoS: 3
    Citation - Scopus: 5
    Statistical Analysis of Gait Data To Assist Clinical Decision Making
    (Springer-verlag Berlin, 2010) Sen Koktas, Nigar; Duin, Robert P. W.; Köktaş, Nigar Şen
    Gait analysis is used for non-automated and automated diagnosis of various neuromuskuloskeletal abnormalities. Automated systems are important in assisting physicians for diagnosis of various diseases. This study presents preliminary steps of designing a clinical decision support system for semi-automated diagnosis of knee illnesses by using temporal gait data. This study compares the gait of Ill patients with 110 age-matched normal subjects. Different feature reduction techniques, (FFT, averaging and PCA) are compared by the Mahalanobis Distance criterion and by performances of well known classifiers. The feature selection criteria used reveals that the gait measurements for different parts of the body such as knee or hip to be more effective for detection of the illnesses. Then, a set of classifiers is tested by a ten-fold cross validation approach on all datasets. It is observed that average based datasets performed better than FFT applied ones for almost all classifiers while PCA applied dataset performed better for linear classifiers. In general, nonlinear classifiers performed quite well (best error rate is about 0.035) and better than the linear ones.
  • Book Part
    Citation - WoS: 25
    Citation - Scopus: 1
    New Treatise in Fractional Dynamics
    (Springer-verlag Berlin, 2012) Baleanu, Dumitru; Baleanu, Dumitru
    Fractional calculus becomes a powerful tool used to investigate complex phenomena from various fields of science and engineering. In this context, the researchers paid a lot of attention for the fractional dynamics. However, the fractional modeling is still at the beginning of its developing. The aim of this chapter is to present some new results in the area of fractional dynamics and its applications.
  • Conference Object
    Citation - WoS: 6
    Citation - Scopus: 12
    New Distinguishers Based on Random Mappings Against Stream Ciphers
    (Springer-verlag Berlin, 2008) Turan, Meltem Soenmez; Calik, Cagdas; Saran, Nurdan Buz; Doganaksoy, Ali
    Statistical randomness testing plays an important role in security analysis of cryptosystems. In this study, we aim to propose a new framework of randomness testing based on random mappings. Considering the probability distributions of coverage and P-lengths, we present three new distinguishers; (i) coverage test, (ii) p-test and (iii) DP-coverage test and applied them on Phase III Candidates of eSTREAM project. We experimentally observed some statistical weaknesses of Po-maranch using the coverage test.
  • Conference Object
    Citation - WoS: 1
    Citation - Scopus: 2
    Clustering Analysis for Vasculitic Diseases
    (Springer-verlag Berlin, 2010) Yildirim, Pinar; Ceken, Cinar; Ceken, Kagan; Tolun, Mehmet R.
    We introduce knowledge discovery for vasculitic diseases in this paper. Vasculitic diseases affect some organs and tissues and diagnosing can be quite difficult. Biomedical literature can contain hidden and useful knowledge for biomedical research and we develop a study based on co-occurrence analysis by using the articles in MEDLINE which is a widely used database. The mostly seen vasculitic diseases are selected to explore hidden patterns. We select PolySearch system as a web based biomedical text mining tool to find organs and tissues in the articles and create two separate datasets with their frequencies for each disease. After forming these datasets, we apply hierarchical clustering analysis to find similarities between the diseases. Clustering analysis reveals some similarities between diseases. We think that the results of clustered diseases positively affect on the medical research of vasculitic diseases especially during the diagnosis and certain similarities can provide different views to medical specialists.
  • Conference Object
    Citation - WoS: 2
    Citation - Scopus: 2
    An Approach To Discrete Convexity and Its Use in an Optimal Fleet Mix Problem
    (Springer-verlag Berlin, 2007) Cambini, R.; Riccardi, R.; Yüceer, Ü.; Yueceer, Uemit
    A notion of convexity for discrete functions is first introduced, with the aim to guarantee both the increasing monotonicity of marginal increments and the convexity of the sum of convex functions. Global optimality of local minima is then studied both for single variable functions and for multi variables ones. Finally, a concrete optimal fleet mix problem is studied, pointing out its discrete convexity properties. © 2006 Springer-Verlag Berlin Heidelberg.
  • Conference Object
    Citation - WoS: 10
    Citation - Scopus: 11
    Towards a Serious Game To Teach Iso/Iec 12207 Software Lifecycle Process: an Interactive Learning Approach
    (Springer-verlag Berlin, 2015) Yilmaz, Murat; O'Connor, Rory V.; Aydan, Ufuk
    ISO/IEC 12207 training is a key element to provide an ability to software development organizations for selecting a set of required processes, measuring the performance of these processes, and continuously improving them. Traditionally, such training is either performed by an expert individual to the software quality management personnel most likely in form of a seminar in a classroom environment. This may also be given by a qualified professional, such as a registered auditor. However, software requirements are usually subject to change, and therefore such training is not enough to teach the substantial details of the entire standard. This has led to increased reports of complications, which demotivates organization to use this standard. To improve the quality of traditional training, a 3D serious game was proposed. The preliminary idea here is that the training is utilized as a game that employs 3D office landscape to provide a realistic virtual environment for ensuring that the training will be based in a real-world-like environment. Before building a prototype for our serious game, we consulted five industrial experts whose works are related with ISO standards. To give these practitioners an opportunity to explore the conceptual design and raise some potential problems, the semi-structured interview method was used. Based on the suggestions of experts, proposed model of the serious game were revised. Taken together, initial results suggest that a serious game for teaching ISO/IEC 12207 should be useful for individuals who are interested in learning more about the standard.
  • Conference Object
    Citation - WoS: 4
    Citation - Scopus: 6
    Examining Reward Mechanisms for Effective Usage of Application Lifecycle Management Tools
    (Springer-verlag Berlin, 2017) Yilmaz, Murat; Tuzun, Eray; Clarke, Paul M.; O'Connor, Rory V.; Usfekes, Cagdas; O’Connor, Rory V.
    Application lifecycle management (ALM) highlights the rules of the road for the entire software ecosystems' lifecycle. Successful ALM enables clarity around the entire delivery effort, from defining requirements to deploying the software product. One of the challenges in software engineering today is to orchestrate ALM tools to a set of software projects effectively. In particular, it is challenging for software practitioners to continuously fully engage with the tasks that are assigned to them. The goal of this study is to address such situations using a game theoretic approach by utilizing a reward mechanism, which we intent to test in a medium-sized software development organization. Based on a set of game elements, this study proposes an auction mechanism to address human resource allocation and task optimization issues, and consequently tackle the potential problem of software practitioners' engagement.
  • Conference Object
    Citation - WoS: 1
    Citation - Scopus: 1
    Randomness as a Constraint
    (Springer-verlag Berlin, 2015) Prestwich, Steven D.; Rossi, Roberto; Tarim, S. Armagan
    Some optimisation problems require a random-looking solution with no apparent patterns, for reasons of fairness, anonymity, undetectability or unpredictability. Randomised search is not a good general approach because problem constraints and objective functions may lead to solutions that are far from random. We propose a constraint-based approach to finding pseudo-random solutions, inspired by the Kolmogorov complexity definition of randomness and by data compression methods. Our "entropy constraints" can be implemented in constraint programming systems using well-known global constraints. We apply them to a problem from experimental psychology and to a factory inspection problem.