Bilgisayar Mühendisliği Bölümü Yayın Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/253

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Citation Count: Gulec, Ulas...et al., "A 3D virtual environment for training soccer referees", Computer Standards & Interfaces, Vol. 64, pp. 1-10, (2019).
A 3D virtual environment for training soccer referees
(Elsevier Science BV, 2019) Güleç, Ulaş; Yılmaz, Murat; İşler, Veysi; O'Connor, Rory V.; Clarke, Paul; 47439
Emerging digital technologies are being used in many ways by and in particular virtual environments provide new opportunities to gain experience on real-world phenomena without having to live the actual real-world experiences. In this study, a quantitative research approach supported by expert validation interviews was conducted to determine the availability of virtual environments in the training of soccer referees. The aim is to design a virtual environment for training purposes, representing a real-life soccer stadium to allow the referees to manage matches in an atmosphere similar to the real stadium atmosphere. At this point, the referees have a chance to reduce the number of errors that they make in real life by experiencing difficult decisions that they encounter during the actual match via using the virtual stadium. In addition, the decisions and reactions of the referees during the virtual match were observed with the number of different fans in the virtual stadium to understand whether the virtual stadium created a real stadium atmosphere for the referees. For this evaluation, Presence Questionnaire (PQ) and Immersive Tendencies Questionnaire (ITQ) were applied to the referees to measure their involvement levels. In addition, a semi-structure interview technique was utilized in order to understand participants' opinions about the system. These interviews show that the referees have a positive attitude towards the system since they can experience the events occurred in the match as a first person instead of watching them from camera as a third person. The findings of current study suggest that virtual environments can be used as a training tool to increase the experience levels of the soccer referees since they have an opportunity to decide about the positions without facing the real-world risks.
Citation Count: Tokdemir, Gul; Bilgen, Semih; Ercil, Yavuz, "A case study on web-based information system evaluation" Proceedings Of The 8th European Conference On Is Management And Evaluation (ECIME 2014), pp.244-252, (2014)
A case study on web-based information system evaluation
(ACAD Conferences Ltd, 2014) Tokdemir, Gül; Bilgen, Semih; Ercil, Yavuz; 17411
A new framework is proposed to assess web-based information systems (WISs) which is domain-independent, that is, can be applied for profit seeking as well as service oriented or non-profit seeking organizations. Assessment starts from an identification of the critical success factors (CSF) that outline organizational strategies, and proceeds to determine the measures of three categories of relationships: User-WIS, Other systems-WIS, Organization-WIS. These measures and CSF's are evaluated collectively to arrive at an effectiveness measure. A case study illustrating the applicability of the assessment framework in the e-business domain is presented.
Citation Count: Özaydın, S., “A Complexity Reduction Method for Joint MSVQ”, ISEIA2016, Accepted to be presented on 4rd International symposium on Engineering, Artificial Intelligence & ApplicationsTechnology & Science, Kyrenia-Cyprus, 2-4 November 2016.
A complexity reduction method for joint MSVQ
(2016) Özaydın, Selma
Citation Count: Yılmaz, M.; Güleç, U. (2018). "A course flow model developed for software engineering course", 12th Turkish National Software Engineering Symposium, Vol. 2201.
A course flow model developed for software engineering course
(2018) Yılmaz, M.; Güleç, U.
As in the rest of the world, many software projects in our country exceed the planned budget and time limits, and the user expectations are not fully met. One of the important reasons for this is the lack of work force that well-trained in software engineering domain. In this article, details of a course flow model and the results of the model for the CENG 396 Software Engineering course, which has been carried out in Çankaya University Department of Computer Engineering for the last four years, will be given. The aim of this study is to explain the lesson flow model which is designed to cultivate the appropriate software engineering and software engineers equipped to conditions in Turkey. In addition, the secondary aim is to share the results of the analysis of this study with other software engineer course instructors so that they can benefit from our experience and achievements.
Citation Count: Sever, Hayri; Polatkan, Aydin Can; Ogul, Hasan, "A Data Fusion Approach In Protein Homology Detection", Proceedings - International Conference On Biocomputation, Bioinformatics, and Biomedical Technologies, Bıotechno 2008, pp. 7-12, (2008).
A Data Fusion Approach In Protein Homology Detection
(IEEE, 2008) Polatkan, Aydın Can; Oğul, Hasan; Sever, Hayri; 11916
The discriminative framework for protein remote homology detection based on support vector machines (SVMs) is reconstructed by the fusion of sequence based features. In this respect, n-peptide compositions are partitioned and fed into separate SVMs. The SVM outputs are evaluated with different techniques and tested to discern their ability for SCOP protein super family classification on a common benchmarking set. It reveals that the fusion approach leads to an improvement in prediction accuracy with a remarkable gain on computer memory usage. © 2008 IEEE.
Citation Count: Sebetci, A. (2006). A density functional study of bare and hydrogenated platinum clusters. Chemical Physics, 331(1), 9-18.
A density functional study of bare and hydrogenated platinum clusters
(Elsevier Science, 2006) Sebetçi, Ali; 20965
We perform density functional theory calculations using Gaussian atomic-orbital methods within the generalized gradient approximation for the exchange and correlation to study the interactions in the bare and hydrogenated platinum clusters. The minimum-energy structures, binding energies, relative stabilities. vibrational frequencies and the highest occupied and lowest unoccupied molecular-orbital gaps of PtnHm (n = 1-5, m = 0-2) clusters are calculated and compared with previously studied pure platinum and hydrogenated platinum clusters. We investigate any magic behavior in hydrogenated platinum clusters and find that Pt4H2 is snore stable than its neighboring sizes. The lowest energy structure of Pt-4 is found to be a distorted tetrahedron and that of Pt-5 found to be a bridge site capped tetrahedron which is a new global minimum for Pt-5 cluster. The successive addition of H atoms to Pt-n clusters leads to an oscillatory change in the magnetic moment of Pt-3-Pt-5 clusters
Citation Count: Choupani, Roya; Wong, Stephan; Tolun, Mehmet R., "A drift-reduced scheme for hierarchical wavelet coding scalable video transmissions", 2009 First International Conference On Advances In Multimedia, (2009).
A drift-reduced scheme for hierarchical wavelet coding scalable video transmissions
(IEEE, 2009) Choupani, Roya; Wong, Stephan; Tolun, Mehmet R.
Scalable video coding allows for the capability of (partially) decoding a video bitstream when faced with communication deficiencies such as low handwidth or loss of data resulting in lower video quality. As the encoding is usually based on perfectly reconstructed frames, such deficiencies result in differently decoded frames at the decoder than the ones used in the encoder and, therefore, leading to errors being accumulated in the decoder. This is commonly referred to as the drift error. Drift-free scalable video coding methods also suffer from the low performance problem as they do not combine the residue encoding scheme of the current standards such as MPEG-4 and H.264 with scalability characteristics. We propose a scalable video coding method which is based on the motion compensation and residue encoding methods found in current video standards combined with the scalability property of discrete wavelet transform. Our proposed method aims to reduce the drift error while preserving the compression efficiency. Our results show that the drift error has been greatly reduced when a hierarchical structure for frame encoding is introduced.
Citation Count: Yilmaz, Mert...et al., "A Gamification Approach to Improve the Software Development Process by Exploring the Personality of Software Practitioners", Software Process Improvement and Capability Determination (Spice 2016), Vol. 609, pp. 71-83, (2016).
A Gamification Approach to Improve the Software Development Process by Exploring the Personality of Software Practitioners
(Springer, 2016) Yılmaz, Mert; Yılmaz, Murat; O'Connor, Rory V.; Clarke, Paul
Although there are various kinds of processes designed to manage the complexities of software development, it is still a challenging endeavor. Recently, a significant number of researchers have started to investigate social problems such as incompatibilities with respect to personality that is likely to be encountered in all stages of the software development process. However, there is no computer-based artifact to reveal the personality types of software practitioners. To bridge this gap, a virtual 3D assessment environment is developed with the ability to immerse individuals similar to a realistic model of the assessment. The interactive questionnaire is based on previous interactive personality assessment framework, which was specifically designed for software engineers. Based on the developed tool, a study was conducted on software practitioners. The data gathered via a survey study from software practitioners is analyzed to observe the difference between the results of paper-based and interactive versions of the same assessment. The analysis of this research states that there is a significant difference between the results of participant's survey scores. Overall, these results indicate that proposed tool is relevant to help software professionals to improve the software development process when personality types are in consideration.
Citation Count: Medeni, İhsan Tolga; Peker, S.; Uyar, M.E. "A Knowledge Visualization Model for Evaluating Internet News Agencies On Conflicting News", Mıpro 2011 - 34th International Convention On Information and Communication Technology, Electronics and Microelectronics - Proceedings, pp. 850-853, (2011).
A Knowledge Visualization Model for Evaluating Internet News Agencies On Conflicting News
(2011) Medeni, İhsan Tolga; 181215
With the advent of the Internet, the news agencies have published news on their websites for the internet readers. This improvement enables Internet readers to access news easily and also to gain information and knowledge in real time manner. Since there are many online news agencies and online newspapers, readers generally have difficulty to decide which newspaper or agency provides the most reliable news. The reliability can be defined as using consistent and proper source of news especially on conflicting news but this increases news' source complexity. As a knowledge management technique, knowledge visualization is one of the ways for readers to decrease this complexity level. In this study, we propose a knowledge visualization model to identify success rates of the online news agencies and online newspapers regarding how consistent they are with the concluded actual news content. This model will be a baseline to indicate knowledge management capabilities of the agencies based on conflicted news categories. © 2011 MIPRO.
Citation Count: Güleç, Ulaş; Yılmaz, Murat; İşler, Veysi, "A literature survey: Is it necessary to develop a new software development methodology for virtual reality projects?", Journal of Universal Computer Science, Vol.23, No.8, pp.725-754, (2017).
A literature survey: Is it necessary to develop a new software development methodology for virtual reality projects?
(Graz Univ Technolgoy, 2017) Güleç, Ulaş; Yılmaz, Murat; İşler, Veysi; 47439
Software development is a complex human endeavour with high failure rates. Although a variety of software development methodologies have been proposed to improve the software development process, there is no universal model for all software development organizations. Virtual reality (VR) is an emerging trend especially for the gaming industry, which should prepare itself for VR development. The goal of this study is to explore potential software development activities and determine whether designing a new software development methodology for VR projects is an important topic for software development organizations working on VR software development. For this purpose, a literature survey has been completed and 71 academic studies have been examined in detail. This study shows that no work is being conducted in the field of developing a new methodology for VR projects. However, the study does show that there are similar endeavours in the field of human computer interaction (HCI), such as game development methodology.
Citation Count: Yılmaz, Murat; Al-Taei, A.; O’Connor, R.V., "A Machine-Based Personality Oriented Team Recommender for Software Development Organizations", Communications In Computer and Information Science, Vol. 543, pp. 75-86, (2015).
A Machine-Based Personality Oriented Team Recommender for Software Development Organizations
(Springer Verlag, 2015) Yılmaz, Murat; Al-Taei, Ali; O'Connor, Rory V.
Hiring the right person for the right job is always a challenging task in software development landscapes. To bridge this gap, software firms start using psychometric instruments for investigating the personality types of software practitioners. In our previous research, we have developed an MBTI-like instrument to reveal the personality types of software practitioners. This study aims to develop a personality-based team recommender mechanism to improve the effectiveness of software teams. The mechanism is based on predicting the possible patterns of teams using a machine-based classifier. The classifier is trained with empirical data (e.g. personality types, job roles), which was collected from 52 software practitioners working on five different software teams. 12 software practitioners were selected for the testing process who were recommended by the classifier to work for these teams. The preliminary results suggest that a personality-based team recommender system may provide an effective approach as compared with ad-hoc methods of team formation in software development organizations. Ultimately, the overall performance of the proposed classifier was 83.3%. These findings seem acceptable especially for tasks of suggestion where individuals might be able to fit in more than one team.
Citation Count: Ozyer, Sibel T.; Ozyer, T.; Kayaalp, M., "A Mash-Up Application Utilizing Hybridized Filtering Techniques for Recommending Events At A Social Networking Site", Social Network Analysis and Mining, Vol. 1, No. 3, (2011).
A Mash-Up Application Utilizing Hybridized Filtering Techniques for Recommending Events At A Social Networking Site
(Springer-Verlag Wien, 2011) Kayaalp, Mehmet; Özyer, Tansel; T. Özyer, Sibel; 18980
Event recommendation is one way of gathering people having same likes/dislikes. In today’s world, many mass amounts of events are organized at different locations and times. Generally, cliques of people are fans of some specific events. They attend together based on each other’s recommendation. Generally, there are many activities that people prefer/opt out attending and these events are announced for attracting relevant people. Rather than, peer-to-peer oracles of a local group of people, or sentiments of people from different sources, an intelligent recommendation system can be used at a social networking site in order to recommend people in collaborative and content basis within a social networking site. We have used an existing social environment (http://www.facebook.com) for deployment. Our application has also been integrated with several web sites for collecting information for assessment. Our system has been designed in modules so that it is open to new data sources either by using web services or web scraping. Currently, our application is yet an application that permits users rate events; they have attended or have beliefs on them. Given the social network between people, system tries to recommend upcoming events to users. For this purpose, we have exploited the fact that a similarity relationship between different events can exist in terms of both content and collaborative filtering. Geographical locations have an impact so; we have also taken geographical location information and social concept of an event. Eventually, our system integrates different sources in facebook (http://www.facebook.com) for doing recommendation between people in close relationship. We have performed experiments among a group of students. Experiments led us have promising results.
Citation Count: Erturan, Y.N...et al. "A Mobile Application Flow Representation for Mutual Understanding of It and Healthcare Professionals", Lecture Notes in Computer Science (Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Vol. 8004, pp. 310-319, (2013).
A Mobile Application Flow Representation for Mutual Understanding of It and Healthcare Professionals
(2013) Erturan, Yusuf Nasuh; Bilgen, Semih; Tokdemir, Gül; Cağıltay, Nergiz E.; Yıldız, Ekrem; Özcebe, Esra; 17411
Ever since mobile applications were developed and became popular, they have started to take part in almost every field of our lives. Healthcare is one of the most popular fields that mobile applications have become a part of. However, development of mobile healthcare applications requires an inter-disciplinary work on which people from different domains should communicate. To do so efficiently, mobile application instructions should be provided as clearly as possible so that mutual understanding can be achieved. This study, aims to provide a methodology to provide the common grounds for healthcare and IT specialists so that to improve the satisfaction level of all the stakeholders of the system from the provided IT services and the end-user interfaces. In other words, by providing a better communication medium for the stakeholders during the design phase, we believe that software development process will be improved, so do their satisfaction from the developed system.
Citation Count: Maras, Hakan Hadi; Mohammed, Ahmed; Elbasi, Ersin, "A New Robust Binary Image Embedding Algorithm in Discrete Wavelet Domain", 8th IEEE International Conference on Application of Information and Communication Technologies (AICT), pp. 16-22, (2014).
A New Robust Binary Image Embedding Algorithm in Discrete Wavelet Domain
(IEEE, 2014) Mohammed, Ahmed; Maraş, H. Hakan; Elbaşı, Ersin; 34410
Digital watermarks have recently emerged as a possible solution for protecting the copyright of digital materials, the work presented in this paper is concerned with the Discrete Wavelet Transform (DWT) based non-blind digital watermarking, and how the DWT is an efficient transform in the field of digital watermarking. In this work we used an optimum criteria that embeds four watermarks in more than one level of DWT in the same algorithm. The aim of this work is to keep the Correlation Coefficient (CC) between the original and the extracted watermark around the value of 0.9.
A Real Time Data Warehouse Approach for Data Processing
(IEEE, 2013) Obalı, Murat; Dursun, Bünyamin; Erdem, Zeki; Görür, Abdül Kadir; 107251
Data that is acquired from different data sources needs too much processing for managing, analyzing and monitoring. Also, you have to fuse and exploit efficiently these data and display the results. Data warehouse consolidates data coming from different data sources. A real time data warehouse is used same purpose as data warehouse, in addition to these, data streams into real time data warehouse on time. Therefore, real time data warehouses can be used in many different areas, such as signal processing, data analysis. In this study, we proposed and implement a real time data warehouse using web services as a prototype.
A Robust Watermarking Scheme Over Quadrant Medical Image in Discrete Wavelet Transform Domain
(IEEE, 2018) Göker, Onur; Nazlı, Nazlı; Erol, Mehmet Murat; Choupani, Roya; 21259
The diffusion of digital content is very fast in today's technology. The velocity of gathering data might cause unlawful distribution of content. The major problem in content authorization is the robustness of methodology. Since frangible methodologies result unauthorized content access quicker, more robust solutions are essential for copyright protection. Watermarking technology is considered as a robust solution for copyright protection and authentication. In watermarking, quality of the image is a challenge. Applying a watermark on a medical image might cause corruption in original image, which leads to misleading content. The proposed copyright protection mechanism includes Quadtree algorithm which finds a region of non-interest to apply watermark on medical image in Discrete Wavelet Domain to provide authentication of the content without altering region of interest. Furthermore, in this paper, the visual quality of watermark implemented medical images and sample values are also discussed with the experimental results as well.
Citation Count: Cagatay, M.; Ege, P.; Tokdemir, G.; Cagiltay, N.E.,"A Serious Game for Speech Disorder Children Therapy", 2012 7th International Symposium On Health Informatics and Bioinformatics, Hibit 2012, pp. 18-23, (2012).
A Serious Game for Speech Disorder Children Therapy
(2012) Cağatay, M.; Ege, Pınar; Tokdemir, Gül; Çağıltay, Nergiz; 17411
Today meaning of games is much more serious than just considering them as an entertainment and free-time activity. Games have begun to be used in many different areas such as education, healthcare, military, corporate management and public policy for different purposes. Several benefits of serious games have been reported in the literature. Studies also show that with a combination of entertainment and education (edutainment) several benefits could be achieved in the rehabilitation process of the disordered individuals. This study reports the advantages of 3D game environments for speech and language therapy of children and benefits of making the treatment process accessible from anywhere and anytime are demonstrated.
Citation Count: Olgun, Serhan...et al., "A Systematic Investigation into the Use of Game Elements in the Context of Software Business Landscapes: A Systematic Literature Review", Software Process Improvement And Capability Determination, Spıce 2017, Vol. 770, pp. 384-398, (2017).
A Systematic Investigation into the Use of Game Elements in the Context of Software Business Landscapes: A Systematic Literature Review
(Springer-Verlag Berlin, 2017) Olgun, Serhan; Yılmaz, Murat; Clarke, Paul M.; O'Connor, Rory V.
The software development process is a set of socio-technical activities to produce software artifacts in which humans play a crucial role. Since it is a people centric activity, factors such as user motivation, engagement, communication and collaboration might constrain these activities. Therefore, software business organizations stand to benefit from adopting different tools and methods in order to overcome these obstacles and to improve their software business processes. Research has been made to increase software quality and enhance the software development process. Alongside these studies, innovative techniques and concepts are beneficial. As a solution, the notion of gamification (i.e. employing game elements in non-gaming contexts) has been introduced to enhance the software development process and overcome the challenges mostly related to human factors. However, the applicability of game elements in the context of software business landscapes is still a controversial issue and not totally proven as of yet. Numerous studies have been conducted to examine the benefits of gamification and how game elements affect the software development process. Thus, in this paper, a systematic literature review was conducted in order to investigate the application of game elements both in research and industrial levels of software development and as well as in software business landscapes.
Citation Count: Quandt, Alexander...et al. "About nanometer sized analogues of basic electronic and optical components", 2008 2nd Icton Mediterranean Wiınter (Icton-Mw)
About nanometer sized analogues of basic electronic and optical components
(IEEE, 2008) Quandt, Alexander; Özdoğan, Cem; Ferrari, Maurizio; Speranza, Giorgio; 40569
We discuss a downsizing of optical components into the nanometer range. It presupposes the substitution of photons by ballistic electrons, but it also requires a simple and robust concept to assemble the analogues of basic electronic and optical components on such a tiny length scale. Here, one of the most promising candidate schemes employs graphene as a basic nanosubstrate. We elucidate the suggested behaviour of graphene as an electronic metamaterial [1], and show that other desired electronic or optical functionalities may be obtained through a patterning with sub-nanometer sized boron clusters [2].
Citation Count: Çaĝiltay, N.E...et al. "Abstract Conceptual Database Model Approach", Proceedings of 2013 Science and Information Conference, Sai 2013, pp. 275-281, (2013).
Abstract Conceptual Database Model Approach
(2013) Çağıltay, Nergiz; Topallı, Damla; Aykaç, Yusuf Evren; Tokdemir, Gül; 17411
One of the main objectives of the software engineers is to provide software related solutions for social problems and to increase the availability of social welfare. In that sense, the quality of the software is directly related to address the users' needs and their level of satisfaction. To reflect user requirements to the software processes, the correct design of the database model provides a critical stage during software development. Database design is a fundamental tool for modeling all the requirements related to users' data. The possible faulty conditions in database design have adverse effects on all of the software development processes. The possible faulty conditions can also cause continuous changes in the software and the desired functionality of the targeted system which may result in user dissatisfaction. In this context, reflecting the user requirements accurately in the database model and understanding of the database model correctly by every person involved in the software development process is the factor that directly affects the success of software systems' development. In this study, a two-stage conceptual data modeling approach is proposed to reduce the level of complexity, to improve the understandability of database models and to improve the quality of the software. This study first describes the proposed two-stage conceptual data modeling. Than the proposed method's impact on software engineers' comprehension is also investigated and the results are compared with the degree of complexity of the related conceptual data models. Results of this study show that, the proposed two-stage conceptual modeling approach improves the understanding levels of software engineers and eliminated possible defects in this stage.

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