Çağıltay, Nergiz
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Prof. Dr.
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necagiltay@cankaya.edu.tr
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Yazılım Mühendisliği
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9
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32
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Conference Object Citation - Scopus: 4Abstract Conceptual Database Model Approach(2013) Çağıltay, Nergiz; Çaĝiltay, N.E.; Topalli, D.; Tokdemir, Gül; Aykaç, Y.E.; Tokdemir, G.; 17411; Yazılım Mühendisliği; Bilgisayar MühendisliğiOne 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. © 2013 The Science and Information Organization.Conference Object Citation - Scopus: 4Analysis of B2C Mobile Application Characteristics and Quality Factors Based On Iso 25010 Quality Model(Springer Verlag, 2014) Tokdemir, Gül; Yildiz, E.; Bilgen, S.; Çağıltay, Nergiz; Tokdemir, G.; Cagiltay, N.E.; Erturan, Y.N.; 17411; Bilgisayar Mühendisliği; Yazılım MühendisliğiThe number of mobile applications in mobile market has rapidly increased as new technology and new devices are emerging at remarkable speed which shows mobile applications have an important role in every field of our life. Among those, even some of the mobile applications have a long time life as end-users use those effectively, some of them fail to do so that prevents the companies to reach from their aim. The main reason of that problem results from the quality of the mobile applications. Although there are some methods and metrics to analyze the quality of mobile applications, they have lack of criteria since they are mostly based on ISO 9126 quality model factors which are invalid anymore. This study aims to analyze both mobile commerce applications' characteristics and quality factors and sub-factors based on ISO 25010 product quality model. Accordingly a quality model is proposed by analysis performed by a group of experts from the mobile software development area. The results of this study aims to help developing more qualified and effective mobile applications from developer perspective. © 2014 Springer International Publishing.Conference Object Citation - WoS: 0Citation - Scopus: 0Analysis of Neurooncological Data to Predict Success of operation Through Classification(Assoc Computing Machinery, 2016) Tokdemir, Gül; Bagherzadi, Negin; Borcek, Alp Ozgun; Çağıltay, Nergiz; Tokdemir, Gul; Cagiltay, Nergiz; Maras, H. Hakan; 17411; Bilgisayar Mühendisliği; Yazılım MühendisliğiData mining algorithms have been applied in various fields of medicine to get insights about diagnosis and treatment of certain diseases. This gives rise to more research on personalized medicine as patient data can be utilized to predict outcomes of certain treatment procedures. Accordingly, this study aims to create a model to provide decision support for surgeons in Neurooncology surgery. For this purpose, we have analyzed clinical pathology records of Neurooncology patients through various classification algorithms, namely Support Vector Machine, Multi Perceptron and Naive Bayes methods, and compared their performances with the aim of predicting surgery complication. A large number of factors have been considered to classify and predict percentage of patient's complication in surgery. Some of the factors found to be predictive were age, sex, clinical presentation, previous surgery type etc. For classification models built up using Support Vector Machine, Naive Bayes and Multi Perceptron, Classification trials for Support Vector Machine have shown %77.47 generalization accuracy, which was established by 5-fold cross-validation.Conference Object Citation - WoS: 1Citation - Scopus: 0Neuronavigation Systems and Passive Usage Problem(Ieee, 2015) Çağıltay, Nergiz; Cagiltay, Nergiz; Tokdemir, Gül; Topalli, Damla; Borcek, Alp Ozgun; Aydın, Elif; Tokdemir, Gul; Maras, Hakan; Tonbul, Gokcen; Aydin, Elif; 17411; Yazılım Mühendisliği; Bilgisayar Mühendisliği; Elektrik-Elektronik MühendisliğiNowadays, neuronavigation systems are used in brain surgery procedures, known as a technology to help the surgeon during the operational period. However, the surgeons have faced several problems with the existing systems. Some of these problems are related to the systems software and user interfaces. In this study, such problems are examined and the "Passive Usage" term is added to the literature by establishing a connection between the problems of endoscopic surgical procedures and similar issues occurred in other domains. The passive usage problem is generalized on different domains for the first time with this study. The results of the study expected to gather up the similar passive usage problems experienced in different domains. Accordingly, the methodologies and studies that are conducted in different research areas may lead to eliminate the Passive Usage problems efficiently.Conference Object Citation - WoS: 0Neuronavigation Skill Training Through Simulation: Insights From Eye Data(Iated-int Assoc Technology Education A& development, 2016) Çağıltay, Nergiz; Tokdemir, Gül; Cagiltay, N. E.; Topalli, D.; Maraş, Hadi Hakan; Borcek, A. O.; Tokdemir, G.; Aydın, Elif; Maras, H. H.; Tonbul, G.; Aydin, E.; 17411; Yazılım Mühendisliği; Bilgisayar Mühendisliği; Elektrik-Elektronik MühendisliğiNeuronavigation systems are developed to support the brain surgery operations. Because of its complex anatomical structure, the neurosurgery is a risky and critical operation. The surgeon is required to perform the operation in a very small area with very restricted movements. The neuronavigation systems are developed to help the surgeon during the operation to show the current position of the surgery with respect to the 3D virtual model of the patient. In these systems, the 3D virtual model of the patient is created according to the medical data (MRI/BT) of the patient. Hence these systems work like navigations systems that are used in driving a car. The surgeon uses this system by controlling the system through a software interface and its user interface and correlates the current position of the operation with the 3D patient virtual model. In this way the surgeon checks the critical anatomical structures through this system and eliminates possible risks. Hence surgeons who will perform such operations are required to develop several skills to manage this very complicated environment. They are required to perform the operation according to the information coming from the navigation display. Additionally, in order to reach relevant information from the navigation display they have to control the navigation panel. In order to prepare surgeons to manage this very complicated environment, their required skills need to be improved during the training period. In this study, to better understand the surgeons' behaviours while managing the tasks related to the surgical navigation procedures, a simulation based environment is developed and an experimental study is conducted with 10 people. Their eye data and their performance data is recorded based on the simulated tasks. The results of the study is analysed statistically and descriptively. The results show that it is possible to control a neuronavigation display through eye movements which could be an alternative human-computer interaction option for designing the neuronavigation systems' user interfaces. Secondly, it is shown that performing a task according to the results of a second information source (neuronavigation system) lowers the general performance in terms of travelled distance with the operation tool and camera (endoscope). However the success level while performing each task and the time spent values are similar in both cases. On the other hand the number of errors is higher in the first scenario. Hence, the surgical education programs need to provide appropriate solutions to better understand and measure the skill levels of trainees on such tasks and to improve their skills through virtual practice systems.Conference Object Türk beyin cerrahlarının teknolojiye ulaşım imkanları(2016) Çağıltay, Nergiz; Tokdemir, Gül; Maraş, Hadi Hakan; Maraş, Hadi Hakan; 17411; 34410; Yazılım Mühendisliği; Bilgisayar MühendisliğiConference Object Citation - WoS: 0Citation - Scopus: 0The usability Study for the Personal Health Record Systems(Ieee, 2015) Tokdemir, Gül; Gokay, Gonca; Ercil, Yavuz; Çağıltay, Nergiz; Tokdemir, Gul; Cagiltay, Nergiz; Aykac, Y. Evren; 17411; Bilgisayar Mühendisliği; Yazılım MühendisliğiWith the emergence of new technologies, there is an increasing number of studies to improve healthcare delivery quality and health services. The studies have shown that the focus should be on integrated, sharable and personalized healthcare solutions which requires usage of patient data as much as possible for fast and correct diagnosis and care. Hence, data related to people when they are healthy and when they are sick become very critical for which many projects have been initiated to increase awareness of people about the importance of data collection all over the world and in our country as well. This requires more active role of the citizens in tracking their healthcare data. In this study, Microsoft Health Vault system that is used for storage of personal health records, has been analyzed in terms of its usability characteristics and the results have been discussed.Conference Object Türk Beyin Cerrahlarının Teknolojiye Ulaşım İmkanları(2018) Çağıltay, Nergiz; 113411; Yazılım MühendisliğiConference Object Citation - Scopus: 24A Serious Game for Speech Disorder Children Therapy(2012) Tokdemir, Gül; Cagatay, M.; Ege, P.; Çağıltay, Nergiz; Tokdemir, G.; Cagiltay, N.E.; 17411; Bilgisayar Mühendisliği; Yazılım MühendisliğiToday 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. © 2012 IEEE.
