Diğer Yayınlar / Other Publications

Permanent URI for this collectionhttps://ada.atilim.edu.tr/handle/123456789/27

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A Mobile Application Flow Representation for Mutual Understanding of IT and Healthcare Professionals
(2013) Erturan, Yusuf Nasuh; Bilgen, Semih; Tokdemir, Gül; Çağıltay, Nergiz; Yıldız, Ekrem; Özcebe, Esra; Computer Engineering; Software Engineering
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 communi cate. 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 dur ing the design phase, we believe that software development process will be improved, so do their satisfaction from the developed system.
A New RF and Microwave Engineering Course Enriched With Advanced Technologies
(2010) Aydın, Elif; Çağıltay, Nergiz; Department of Electrical & Electronics Engineering; Software Engineering
In this study, a curriculum model including recent developments and technologies in the Radio Frequency (RF) and Microwave Engineering field by using a blended approach is proposed. This study covers the description of the content of theoretical and hands on applications, the integration model of the technological tools into the proposed curriculum, and the instructional approaches used in the new course design. The main goal of the course is to prepare students for future professional careers in RF and Microwave Engineering by supporting them with new instructional technologies. The secondary goal of the course is to better prepare the students for the sequence of senior courses in the Electrical and Electronics Engineering program of Atilim University. The course is structured with a balance between theory and laboratory, including remote and in lab measurement experiments as well as modeling and designing microwave components by means of computer tools and design fabrication. The newly designed course is implemented at the Atilim University. The study also reports the first semester implementation.
A REMOTE LABORATORY FOR TRAINING IN RADIO COMMUNICATIONS: ERRL
(IEEE, 2007) Kara, Ali; Aydın, Elif; Öktem, Ruşen; Çağıltay, Nergiz; Department of Electrical & Electronics Engineering; Software Engineering
This paper presents, first, a short survey of remote laboratory initiatives in electrical and computer engineering, and then discusses design and development phases of remote laboratory environment on radio communications, the ERRL (European Remote Radio Laboratory). As being the first attempt in establishing of such a large scale remote laboratory on radio communications, ERRL enables access to high technology RF equipments and setups through the Internet. The software structure, target groups and experimental set ups of ERRL are shortly discussed. First attempts on implementation of pilot experiments are discussed.
A WEB BASED TRAINING MODULE FOR TEACHING DIGITAL COMMUNICATIONS
(2015) Kara, Ali; Erdem, Cihangir; Department of Electrical & Electronics Engineering; Çağıltay, Nergiz; Aydın, Elif
An interactive module which simulates a digital transmission link from one end to the other has been designed. Using the module, a user may enter a short audio/message signal using microphone of a PC, and then follows processes on the signal at each stage of the digital transmission link. The user can also analyze the signal at every stage of the link, and compare the performance of various modulation schemes used in the link, and finally may see how the audio signal is corrupted by noise in the transmission link. In this way, from source point to destination point of the signal, the user may study various stages such as analog to digital conversion, analysis of effects of Gaussian noise on the message signal.
An Indoor Navigation Aid Designed for Visually Impaired People
(2008 34th Annual Conference of IEEE Industrial Electronics, 2008) Öktem, Ruşen; Aydın, Elif; Çağıltay, Nergiz; Department of Electrical & Electronics Engineering; Software Engineering
This work introduces the hardware architecture and general principles of a portable indoor navigation system for guiding visually impaired people. It operates through wireless communication between a compact hardware interface unit carried by the user, a central processing unit and an active RFID unit. The RFID unit collects signals as regard to the position of the user, the central system processes those signals to estimate the position of the user and proposes a route and direction for the user to follow, whereas hardware interface unit provides interaction. The orienteering of the user is obtained by a tactile compass.
Customizing SSL Certificate Extensions to Reduce False-Positive Certificate Error/Warning Messages
(International Journal of Information Security Science, 2016) Tarazan, Şafak; Bostan, Atila; Computer Engineering
In today’s Internet world, X.509 certificates are commonly used in SSL protocol to provide security for web-based services by server/client authentication and secure communication. Although SSL protocol presents a technical basis, this web security largely depends on user awareness of security measures as well. There are significant number of scientific studies in the literature reporting that the count of invalid or self-signed certificate usage in today’s Internet can not be overlooked. At the same time, quite a number of studies place emphasis on the acquired indifference towards certificate warning messages which are popped up by web browsers when visiting web pages with invalid or self-signed certificates. In this study, with the importance of user’s daily practices in developing habits in mind, we studied a modification of X.509 certificates in order to reduce the number of false-positive certificate-warning pop ups in order to reduce gaining faulty usage habit of invalid certificates.
Design and development of a remote and virtual environment for experimental training in Electrical and Electronics Engineering
(2010 9th International Conference on Information Technology Based Higher Education and Training (ITHET), 2010) Kara, Ali; Aydın, Elif; Özbek, Mehme Efe; Çağıltay, Nergiz; Department of Electrical & Electronics Engineering; Software Engineering
European Remote Radio Laboratory (ERRL) has been developed by the support of European Commission. It intends to provide remote access to high cost devices remotely, and perform experiments in radio frequency (RF), communications and microwave domains of Electrical and Electronics Engineering. The system has been operational for two years, and been integrated into curriculum of some courses. In this work, the hardware and software structures of the system are presented. Then, experimental content and the motivations in the design of the system are discussed.
Determination of measurement noise, conductivity errors and electrode mislocalization effects to somatosensory dipole localization
(Biomedical Research, 2012) Şengül, Gökhan; Baysal, Uğur; Computer Engineering
Calculating the spatial locations, directions and magnitudes of electrically active sources of human brain by using the measured scalp potentials is known as source localization. An accu rate source localization method requires not only EEG data but also the 3-D positions and number of measurement electrodes, the numerical head model of the patient/subject and the conductivities of the layers used in the head model. In this study we computationally deter mined the effect of noise, conductivity errors and electrode mislocalizations for electrical sources located in somatosensory cortex. We first randomly selected 1000 electric sources in somatosensory cortex, and for these sources we simulated the surface potentials by using av erage conductivities given in the literature and 3-D positions of the electrodes. We then added random noise to measurements and by using noisy data; we tried to calculate the positions of the dipoles by using different electrode positions or different conductivity values. The esti mated electrical sources and original ones are compared and by this way the effect of meas urement noise, electrode mislocalizations and conductivity errors to somatosensory dipole lo calization is investigated. We conclude that for an accurate somatosensory source localization method, we need noiseless measurements, accurate conductivity values of scalp and skull lay ers and the accurate knowledge of 3-D positions of measurement sensors.
Distance Laboratory Applications ERRL: A Study on Radio Communication in Electronic Field
(Optimization of Electrical and Electronic Equipment, 2008) Aydın, Cansu Çiğdem; Özyurt, Erdem; Aydın, Elif; Çağıltay, Nergiz; Özbek, Efe; Alparslan, Ceren; Department of Electrical & Electronics Engineering; Software Engineering
In the last decade, the effect of internet usage in education is gradually increased. When we look from academic perspective, the new technologies provided alternatives for students learning. As distance education becomes important everyday, the indispensable elements of teaching and education, laboratories must be reachable via remote connection. Consequently, the education that is going to be given to the students will be more flexible with respect to place and time constraints and students can reach laboratory facilities at any time and anywhere not only in lectures and practical hours. In this study, European Remote Radio Laboratory (ERRL) which is a distance remote Radio Frequency (RF) laboratory designed for electrical-electronics students, is described generally. The software architecture, infrastructure and experiment that can be done with a remote connection have been described.
Distance Laboratory Applications ERRL: A Study on Radio Communication in Electronic Field
(IEEE, 2008) Aydın, Cansu Çiğdem; Özyurt, E.; Aydın, Elif; Çağıltay, Nergiz; Özbek, Mehmet Efe; Alparslan, Ceren; Kara, Ali; Department of Electrical & Electronics Engineering; Software Engineering
In the last decade, the effect of internet usage in education is gradually increased. When we look from academic perspective, the new technologies provided alternatives for students learning. As distance education becomes important everyday, the indispensable elements of teaching and education, laboratories must be reachable via remote connection. Consequently, the education that is going to be given to the students will be more flexible with respect to place and time constraints and students can reach laboratory facilities at any time and anywhere not only in lectures and practical hours. In this study, European Remote Radio Laboratory (ERRL) which is a distance remote Radio Frequency (RF) laboratory designed for electrical-electronics students, is described generally. The software architecture, infrastructure and experiment that can be done with a remote connection have been described.
Effects of anisotropy in a physical torso phantom on source reconstructions from a current dipole
(Noninvasive Functional Source Imaging of the Brain and Heart and the International Conference on Functional Biomedical Imaging, 2007) Lıehr, Mario; Şengül, Gökhan; Baysal, Uğur; Haueısen, Jens; Computer Engineering
In this study, we investigated experimentally the influence of anisotropic compartments on source reconstruction using phantom measurements with an artificial current dipole as signal source. The anisotropic compartment was built from single skeins with a nine times higher conductivity than the surrounding solution. We placed the dipole at the lower borders of the anisotropic bulk and measured the magnetic field and the electric potential for each dipole location. The current dipole was rotated in relation to the anisotropic skeins and potentials and fields were recorded for different angles between anisotropic skeins and current dipole. We found that the estimated dipole orientations are strongly influenced by the anisotropy, while the reconstructed position of the dipole is not significantly influenced. We conclude that for bioelectric and biomagnetic source reconstruction, it is necessary to take into account anisotropic structures in the volume conductor if dipole orientations are of interest.
Heterogeneity in Classes: Cooperative Problem-Solving Activities through Cooperative Learning
(Croatian Journal of Education, 2014) Çiğdemoğlu, Ceyhan; Kapusuz, Kamil Yavuz; Kara, Ali; Public Relations and Advertising; Department of Electrical & Electronics Engineering
Teachers, from primary schools to college, experience challenges regarding both increased class sizes and a greater diversity of students having a broad spectrum of abilities, interests, needs, and goals. The aim of this paper is to investigate the effect of cooperative learning through Cooperative Problem-Solving (CPS) activities on homogenous and heterogeneous grouping in an engineering course. As a mixed method design, the study utilized both quantitative and qualitative data. The participants, 47 engineering students selected conveniently, were enrolled in a communication systems course. The analysis of the quantitative data indicated that no significant difference (p= .791) exists between the ways in which the students in homogenous and the students in heterogeneous group understand communication systems. In order to reveal the perceptions of students regarding the implementation, they were interviewed at the end of the semester. The qualitative data obtained from these interviews suggests that students prefer heterogeneous to homogenous grouping. The findings also imply that further research should concentrate on heterogeneous grouping strategies and more detailed qualitative data in order to reveal what kind of patterns emerge from students’ interactions in different groupings.
HOW ASSESSMENT SYSTEM OF AN OPEN SOURCE LEARNING MANAGEMENT SYSTEM CAN BE INTEGRATED TO A REMOTE LABORATORY APPLICATION? PROBLEMS AND SOLUTIONS
(IEEE, 2007) Aydın, Cansu Çiğdem; Çağıltay, Nergiz; Software Engineering
Most of the education programs need an assessment system for formative and summative evaluation purposes. Similarly, in the ERRL* project which is a distance remote radio frequency laboratory application, assessment system is required. However, developing an assessment system cost is very high and requires some extra time for testing and development purposes. Open source systems provide these services in a standard way. Since the source is open, it is possible to make some modifications to better adapt these systems to the requirements of developed systems. Similarly, in the Moodle part of the system we need to integrate the test and the experiment platforms. In order to better guide the learners in the system, they should take some tests about the devices and the theoretical content included in the system. It is important to prevent users who do not have the enough knowledge directed to the experiments platform. These testing requirements should be integrated into the remote laboratory system, so that, the learners should not need to jump between different systems and interfaces. This article presents implementation process of open source Learning Management System software’s assessment module to a remote laboratory application and it also discusses the advantages, disadvantages of using an open source Web based assessment system.
HOW ASSESSMENT SYSTEM OF AN OPEN SOURCE LEARNING MANAGEMENT SYSTEM CAN BE INTEGRATED TO A REMOTE LABORATORY APPLICATION? PROBLEMS AND SOLUTIONS
(The 18th Annual IEEE International Symposium on Personal,Indoor and Mobile Radio Communication (PIMRC’07), 2007) Aydın, Cansu Çiğdem; Çağıltay, Nergiz; Software Engineering
Most of the education programs need an assessment system for formative and summative evaluation purposes. Similarly, in the ERRL* project which is a distance remote radio frequency laboratory application, assessment system is required. However, developing an assessment system cost is very high and requires some extra time for testing and development purposes. Open source systems provide these services in a standard way. Since the source is open, it is possible to make some modifications to better adapt these systems to the requirements of developed systems. Similarly, in the Moodle part of the system we need to integrate the test and the experiment platforms. In order to better guide the learners in the system, they should take some tests about the devices and the theoretical content included in the system. It is important to prevent users who do not have the enough knowledge directed to the experiments platform. These testing requirements should be integrated into the remote laboratory system, so that, the learners should not need to jump between different systems and interfaces. This article presents implementation process of open source Learning Management System software’s assessment module to a remote laboratory application and it also discusses the advantages, disadvantages of using an open source Web based assessment system.
How to Teach Usage of Equipments in a Remote Laboratory
(IEEE, 2007) Alparslan, Nimet Ceren; Çağıltay, Nergiz; Özen, Mustafa; Aydın, Elif; Department of Electrical & Electronics Engineering; Software Engineering
European Remote Radio Laboratory (ERRL) is an e learning project for students, teachers and technicians of the universities who will use the very important devices of this laboratory remotely. These devices are very expensive to buy and can be broken easily while they have been using by the people who does not really know how to use them professionally. As a solution we have developed an e-learning system which aims to support the ERRL learners while studying on how to use equipments in the system. The system is developed according to the electronic performance support systems (EPSS) approach. An EPSS is a computer-based, well structured system which improves the performance of individuals. It is an electronic infrastructure that contains, stores and distributes personal (individual) or corporate knowledge to enable people to reach necessary levels of performance in the fastest possible time and with minimum teaching support of other people. This paper discusses how the content for such a system is developed and how this content is interactively used in the EPSS platform. The technical details of the developed EPSS are also discussed in this study. We believe that this paper will help instructional system designers for designing different alternatives to improve learners’ performance.
İlaç Araştırmalarında Yeni Nesil Uygulamalar: Kontrollü İlaç Salımı
(Bilim ve Teknoloji, 2012) İşgör, Belgin S.; Korkmaz Özkan, Filiz; Physics Group
16.yüzyılda yaşamış olan ve bugünkü Modern tıbbın kurucularından sayılan Paracelsus’un “Her şey zehirdir. Zehirle ilacı ayıran dozudur” sözü, bugünkü modern toksikolojinin temeli olan doz-cevap ilişkisine dikkat çekmesi açısından son derece önemlidir. Günümüzde ilaç olarak sunulan sentetik ve doğal kaynaklı kimyasal bileşiklerin vücuda alımı genel olarak ağızdan (oral) katı veya sıvı formlarda, damar ve kas içerisine sıvı enjeksiyonuyla, nazal yol aracılığıyla sprey veya toz formunda inhalatör yardımıyla, veya deriden lokal uygulamalarla gerçekleşmektedir. Vücuda verilen ilaç ilk olarak dolaşım sistemine alınır ve tedavi için hedeflenen dokuya kan damarları ile taşınır. Hedef dokulara ise bu dokulara nüfuz etmiş kılcal damarlar yoluyla ulaşır. İlacın vücuda alımından hedef dokuya taşınması sürecinde, damar yolu üzerinde bulunan tüm dokularca alınıp hücresel mekanizmalarca işlenmesi mümkündür.
İnsan Kafasındaki Dokuların Öziletkenliklerinin in vivo E/MEG Verileri ile Kestirilmesi ve Üç Değişik Kestirim Algoritma Sonuçlarının Karşılaştırılması
(Signal Processing and Communications Applications Conference, 2004) Şengül, Gökhan; Baysal, Uğur; Haueısen, Jens; Computer Engineering
Doku öziletkenliklerinin bilinmesi, insan vücudunun güvenilir hacim iletken modellerinin oluşturulmasında ve ileri/ters biyoelektrik alan problemlerinin çözümünde gereklidir. Bu çalışmada, insan kafasindaki dokulann öziletkenliklerinin EEG ve MEG verileri kullanılarak in vivo kestirimi ipin üç farklı kestirim algoritmasi kullanılarak elde edilen sonuçlar karşılaştırılmıştır. Uygulanan bu algoritmalar; En Küçük Hatalar Karesi (E.K.H.K) kestirim algoritmasi, Bayesian MAP kestirim algoritmasi ve istatistiksel Kısıtlı Minimum Ortalama Hatalar Karesi (1.K.M.O.H.K) algoritmasıdır. Algoritmalar, geometrik yapı, ön bilgisi ile doku öziletkenlikleri ile doğrusallaştırma ve enstrümantasyon gürültüsünün istatistiksel ön bilgilerini girdi olarak kullanır. E/MEG verileri, medyan sinirin uyarıkdığı kaynak konumlandırma deneyinden sırasıyla 32 kanallı EEG ve 31 kanallı magnetometre ile somatosensory korteks üzerinden ölçülmüştür. Kafanın anatomik geometri bilgisi 256 adet TI ağırlıklı MRI görüntüden elde edilmiş ve kafa derisi, kafatası ve beyin olarak homojen üç bölgeye bölütlendirilmiştir. Sözkonusu algoritmalar kullanılarak kafa derisi, kafatası ve beyin öziletkenlikleri ve hata oranları üç farklı algoritma ile kestirilmiştir. Hata oranları E.K.H.K için %90, Bayesian Map kestirim algoriması için % 20.5 ve İ.K.M.O.H.K algoritması için %12.5 olarak hesaplanmıştır. Sonuçta İ.K.M.O.H.K algoritmasının diğer algoritmalara kıyasla daha düşük hata oranları verdiği gösterilmiştir.
Maintenance, sustainability and extendibility in virtual and remote laboratories
(Social and Behavioral Sciences, 2011) Kara, Ali; Özbek, Mehmet Efe; Çağıltay, Nergiz; Aydın, Elif; Department of Electrical & Electronics Engineering; Software Engineering
This study presents discussions on sustainability of Virtual and Remote Laboratories (VRL), and provides challenges toward maintenance of VRLs. Technical and pedagogical issues in extension and sustenance of VRLs are discussed with the experiences of the authors gained in the development of a VRL system, European Remote Radio Laboratory (ERRL) platform. Moreover, the study presents actions to be taken in sustenance plan and expendability of VRL system with the advances in Information and Communication Technologies (ICT) and educational technologies along with the needs of educators and learners in formal education.
MERAK ETTİĞİMİZ GEZEGEN “MARS” ve LAZER SPEKTROSKOPİSİ
(Bilim ve Teknoloji, 2014) Eseller, Kemal Efe; Department of Electrical & Electronics Engineering
Bilim insanları, evrende gerçekleşen olayları merak ettiği sürece hayatı kolaylaştıran yeni buluşlara ulaşacak ve her geçen gün bilime daha fazla katkı sağlayacaklardır. Amerikan Havacılık ve Uzay Ajansı (NASA), Mars gezegenine gönderdiği Curiosity (merak) - Rover sistemi ile gezegende çok önceden yaşamış canlı kalıntılarını (mikroplar, tek hücreli canlılar) bulabilmek için araştırmalar yapmakta ve gezegenin tarihi oluşumunu incelemektedir. Mars yüzeyinde, insanoğlu için gerekli Sülfür (S), Nitrojen (N), Oksijen (O), Fosfor (P) ve Karbon (C) gibi elementlerin varlığı ve izleri, gelecekte bu konuda yapılacak araştırma konularını şekillendirmekte ve uygun yaşam koşullarının bulunması için zemin hazırlamaktadır.
Principles for the Design of a Remote Laboratory: A Case Study on ERRL
(IEEE, 2010) Çağıltay, Nergiz; Aydın, Elif; Kara, Ali; Department of Electrical & Electronics Engineering; Software Engineering
Remote laboratories are getting very popular in engineering education programs. However, there are not many studies addressing the requirements and design issues of such laboratories. This paper discusses the results of a study of the requirements for developing a remote Radio Frequency (RF) laboratory for university students. This study draws on the perspectives of the students at the university, department of electrical engineering. The results are based on a research study established by 111 engineering students from France, Germany, Romania and Turkey. It investigates how students would like to use the technical content of a state of the art RF laboratory. The result of this study is also compared with the previous outcomes showing perspectives of the other learner groups of such laboratories; engineers and technicians in the technical colleges on the Radio Frequency (RF) domain. Considering the outcomes developed so far, some principles that need to be considered while designing and developing such a laboratory have been proposed. As a case study the proposed principles are implemented in a remote laboratory project. In this paper, the details of user requirements of such laboratories, the proposed principles and the implementation examples are all provided and discussed. Primarily, the general aim of this study is to guide remote laboratory platform developers towards the most effective design of their platforms.

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