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Showing papers by "Yaşar University published in 2007"


Journal ArticleDOI
TL;DR: In this article, power quality (PQ) signals are analyzed by using Welch (non-parametric) and autoregressive (parametric), spectral estimation methods, and the results demonstrate superior performance of the AR method over the Welch method.

51 citations


Journal ArticleDOI
TL;DR: A continuous marker based on a more rigorous spectral analysis of EEG to measure or quantify the depth of sleep is developed and it is believed that use of this marker will lead to a better quantification of sleep quality.

36 citations


Journal ArticleDOI
Musa H. Asyali1
TL;DR: This study discusses shortcomings of some existing gene expression profile classification methods, proposes a new approach based on linear Bayesian classifiers and finds that the method outperforms PAM and produces comparable results with SVM.

11 citations


Journal ArticleDOI
TL;DR: A simple and cost-effective method based on image analysis that can be used in the objective assessment/measurement of tremor and presents the use and advantages of the devised system on a sample artificial data set.
Abstract: In th is study, we introduce a simple and cost-effective method based on image analysis that can be used in the objective assessment/measurement of tremor. Tremor can be defined as the involuntary rhythmic movement of body parts (usually hands). Types of tremor include, but not limited to essential tremor, athetose, chorea, and flapping tremor. Objective assessment of tremor is crucial in the diagnosis of many neuromuscular d iseases. Velocity and acceleration sensors utilizing semiconductor technology a re widely used for measurement of tremor. However, one major weakness of this type of sensors is that they cannot sa tisfactorily track slow or constant speed motion, because of their poor response in the low-frequency region, where some of tremors may have some significant spectral components. Therefore, accurate measurement of tremor for the diagnosis or prognosis of movement disorders is an important issue. The method that we devise consists of an in fra-red LED that is attached to the body part whose motion to be measured and a simple CCD camera that is a ttached to a personal computer. The frames acquired by th e system first saved into a movie file, and then analyzed using a software tool that we have developed. We present the use and advantages of the devised system on a sample artificial data se t.

7 citations


01 Feb 2007
TL;DR: In this article, the authors provide a guideline on how intelligent agent technologies can be employed to deal with these complex issues and provide a framework for producers to produce a variety of products which are individually designed for each customer.
Abstract: Due to market conditions many production system begin to follow customer-oriented philosophy which leads to Mass Customisation Systems. Mass Customisation provides a framework for producers to produce a variety of products which are individually designed for each customer. Therefore, it requires dealing with an explosive number of product variations and customer orders and increases the complexity of activities. This paper provides a guideline on how intelligent agent technologies can be employed to deal with these complex issues.

6 citations


Book ChapterDOI
01 Jan 2007
TL;DR: The method of obtaining VS representation of nonlinear systems from their NN models as an alternative approach is discussed and its modeling performances against the popular Laguerre basis expansion (LBE) technique are compared.
Abstract: Both neural networks (NN) and Volterra series (VS) are widely used in nonlinear dynamic system identification. In VS approach, the system is modeled using a set of kernel functions that correspond to different order convolutions. Kernels in VS are typically estimated using an orthogonal expansion technique. In this study, we discuss the method of obtaining VS representation of nonlinear systems from their NN models as an alternative approach and compare its modeling performances against the popular Laguerre basis expansion (LBE) technique. In LBE approach, the critical issues are to select a suitable pole parameter and number of basis functions to be used in the expansions, so that the kernels can be accurately represented. We devised novel approaches to address both issues, the pole parameter is selected using a systematic optimization approach and the number of basis functions is decided using the minimum description length criterion. Our preliminary results on synthetic data indicate that when used with these provisions, LBE yields more accurate kernels estimation results than the NN approach. However, LBE is typically used without these provisions in literature. We demonstrate that with its typical use, kernels estimated using the LBE approach can be quite misleading even though the estimation error may seem to be reasonable. Therefore, we suggest the use NN approach as a reference method to confirm the morphology of the kernels estimated via other approaches, including LBE.

4 citations


Journal ArticleDOI
TL;DR: In this article, the authors examined the impact of the three organizational success factors (customer focus, innovation, and personnel commitment) on the business performance of Turkish firms and found that firms with high customer focus, personnel commitment, and innovation significantly outperformed those firms with low customer focus and commitment.
Abstract: This paper examines the impact of the three organizational success factors–customer focus, innovation, and personnel commitment–on the business performance of Turkish firms. A survey instrument was developed and administered to the managers of the firms. The study found a significant relationship between the organizational success factors and business performance, where firms with high customer focus, personnel commitment, and innovation significantly outperformed those firms with low customer focus, personnel commitment, and innovation on a number of performance measures. High correlations among the three organizational success factors indicate synergistic relationships among them. This suggests that in order to achieve high performance and organizational success, firms need to “have a customer focus culture, must have personnel commitment, and must innovate.”

4 citations


Proceedings ArticleDOI
TL;DR: The key technologies of the distributed cooperative computing GIS software are discussed, which include technology of global spatial resource management, spatial data computing task allocation and management, system consistency mechanism and system security mechanism.
Abstract: This paper introduces the concept of grid computing and its characteristics. Basing on analyzing the characteristics of grid computing, we apply grid computing to GIS field to construct grid GIS, which is the application of grid computing on geographic information system with grid computing as the basic running environment. According to the architecture of grid and integrating the characteristics of GIS, we design the architecture of grid GIS, which has three layers. They are grid GIS resource layer, grid GIS middleware layer and grid GIS application layer. Among them, the grid GIS middleware layer is the most important. Then this paper expatiates on our research on grid GIS middleware, which is about the design and development of distributed cooperative computing GIS software. The key technologies of the distributed cooperative computing GIS software are discussed, which include technology of global spatial resource management, spatial data computing task allocation and management, system consistency mechanism and system security mechanism. The implementation process is also presented. At last, this paper presents the further researches of the distributed cooperative computing GIS software.

3 citations


Sabah Balta1
01 May 2007
TL;DR: In this paper, the authors address the issue of illumination of new technologic tools that enforce training in which hospitality businesses considered, and suggest alternate explanations for training needs, technologic implications are also required for hospitality businesses.
Abstract: Hospitality sector needs new technological training tools, which can assist to improve sector employees’ skills and services quality. The sector might be more interactive when these technological training tolls used on the job-training program. This study addresses to issue of illumination of new technologic tools that enforce training in which hospitality businesses considered. In addition to suggesting alternate explanations for training needs, technologic implications are also required for hospitality businesses.

2 citations


01 May 2007
TL;DR: Relationships between the efficiency of learning and the ownership of personal computers have been investigated and some conclusions are drawn, which concern the influence of computer ownership and usage patterns on the learning curve of students.
Abstract: Fast growth of computer related technology both in software-hardware and application areas, brings new challenges to be faced when using computers for supporting education. In this paper some experiences and the results of a survey are presented in teaching computer topics using computer as a teaching tool. Our teaching activities are related to both computer engineering and vocational school computer programming students and also to students from different areas like marketing, foreign trade, etc. The students in the second category learn computers as a tool for their daily work, whereas students of the first group learn computers as part of their professional education. Although the students come from different departments, there are many common pedagogical problems. In this paper, relationships between the efficiency of learning and the ownership of personal computers have been investigated .For this purpose, we conducted a survey on the students of Yasar University and evaluated the results together with their exam grades. The outcomes are presented and some conclusions are drawn, which concern the influence of computer ownership and usage patterns on the learning curve of students.

1 citations


Journal Article
TL;DR: This paper addresses the issue of caching in relational database system within client-server structure and a method that can be used to keep clients' cache up to date and to use the clients' memories for caching.
Abstract: Although multi-tiered software development is taking the place in database application environments, client-server infrastructure has still been in use for years. Furthermore, both infrastructures still need to be improved in some aspects. One of the important aspects of improvement is caching. This paper addresses the issue of caching in relational database system within client-server structure and a method that can be used to keep clients' cache up to date. The main objective of the proposed caching methods is to use clients' idle time in order that clients' cache is up-to-dated and to use the clients' memories for caching. For this purpose, a new combined system which includes CCDT (Clients Cache Description Table) for organizing client cache updating, predicate-based caching method MNTC (Maximum Number of Tuples in Cache) that includes a managerial patch in server-side and small patches in clients-side, and TPCF (Time Period calculated from client Commit Frequency) for calculation of idle time of the clients, is presented.

Journal Article
TL;DR: Application software developed for special education for teaching individuals with learning disabilities is used to demonstrate the applicability of a database integrated information processing system to alleviate the burden of educators.
Abstract: In this presentation, we discuss the use of information technologies in the area of special education for teaching individuals with learning disabilities. Application software which was developed for this purpose is used to demonstrate the applicability of a database integrated information processing system to alleviate the burden of educators. The software allows the preparation of individualized education programs based on the predefined objectives, goals and behaviors. Keywords—Special education, disabled individual, information technology, individual education programs.

Book ChapterDOI
01 Jan 2007
TL;DR: It is observed that the Volterra modeling based on Laguerre basis expansion of kernels offers better performance compared to fuzzy modeling, which is based on a set of fuzzy membership functions and rules.
Abstract: In this study, we investigated modeling performances of two popular nonlinear system identification methods, namely fuzzy modeling and Volterra series. In literature a general approach to nonlinear structure modeling does not exist, therefore both fuzzy models and Volterra series are interesting and widely used as they can approximate a large class of nonlinear functions. In fuzzy modeling, a dynamic system is modeled using a set of fuzzy membership functions and rules. The fuzzy model parameters are trained using optimization techniques. In Volterra series approach, the dynamic system is modeled using a set of kernel functions that represent the first and higher order convolutions. The kernel functions are typically estimated using an orthogonal expansion technique using a set of suitable basis functions such as Laguerre. We compared the modeling performance of these approaches on a hypothetical test system whose kernels or structure is known priori and observed that the Volterra modeling based on Laguerre basis expansion of kernels offers better performance.

01 May 2007
TL;DR: In this article, an assessment software assisted questionnaire is presented for Database Management Systems courses, gathered results are used to construct GEP (Group Education Plans) for classes, and they can also be used to individualize for each student for their laboratory trainings.
Abstract: Course syllabuses are usually prepared by the instructors without any feedback observed and assembled from target students. More, even sometimes these syllabuses are used for many years with little alterations by the instructors. This situation affects the education negatively, because many of the students come with different backgrounds and interests on the content of the target course. In addition, knowledge level and profile of the students might change ever year according to their prior education curriculums or some others reasons. In enclosure, a good questionnaire which is prepared and applied to newly coming students to get their level of interests on the course, may be useful too much in order to make the good education plan for groups. In this paper, an assessment software assisted questionnaire is presented for Database Management Systems courses. Using the assessment software, gathered results are used to construct GEP (Group Education Plans) for classes, and they can also be used to individualize for each student for their laboratory trainings. Assessing current level of the students using computer software assists to analyze results in many aspects and to arrange the objectives according to level of the class. Finally, a new course layout which is quite relevant to students, might be created.

Journal ArticleDOI
TL;DR: This paper analyzes some graph issues by using the symbolic program Mathematica and its version for the Web, webMathematica.com, to consider the problem of graph coloring: the assignment of colors to the vertices/edges of the graph such that adjacent vertices /edges are colored differently.

01 May 2007
TL;DR: A software assisted questionnaire form through a dynamically updated web page is presented for Computer Networks course and will facilitate the preparatory reviews for the lecturers to create a satisfactory education plan based on the student feedback.
Abstract: Course descriptions prepared by the lecturers in the beginning of the academic year do not get any feed back from the students enrolled it. These syllabuses are not only used for the future semesters, but also used by the other lecturers without even making any changes. This causes a negative effect on the student education since many of the students come with the different backgrounds and interests for the content of the course. In addition to the changing abilities and capabilities of the students every year, there can be administrative changes in the official curriculum. In our approach, we prepared a detailed dynamic web site together with questionnaire filled in advance, that will be applied to the new students to determine their knowledge level. This will also facilitate the preparatory reviews for the lecturers to create a satisfactory education plan based on the student feedback. In this paper, a software assisted questionnaire form through a dynamically updated web page is presented for Computer Networks course. Assessing current level of the students helps to analyze and improve results in many aspects and converges the objectives of the students and the course teacher.