Çağıltay, Nergiz

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Çağıltay, Nergiz

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Çağıltay, Nergis E.
Nergiz, Çağıltay
Çağıltay, Nergiz
Nergiz, Cagiltay
Ç.,Nergiz
C.,Nergiz
N., Cagiltay
N.,Çağıltay
Cagiltay, Nergiz
Cagiltay,N.
Çağıltay,N.
N.,Cagiltay
C., Nergiz
Çağıltay, Nergiz Ercil
Cagiltay, Nergiz Ercil
Çağıltay, Nergiz E.

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Profesör Doktor

Email Address

nergiz.cagiltay@atilim.edu.tr

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Scholarly Output

131

Articles

75

Citation Count

909

Supervised Theses

27 Scholarly Output Search Results

Now showing 1 - 10 of 129

Citation Count: 5
Eye-Hand Coordination Patterns of Intermediate and Novice Surgeons in a Simulation-Based Endoscopic Surgery Training Environment
(int Group Eye Movement Research, 2018) Topallı, Damla; Cagiltay, Nergiz Ercil; Çağıltay, Nergiz; Information Systems Engineering; Software Engineering
Endoscopic surgery procedures require specific skills, such as eye-hand coordination to be developed. Current education programs are facing with problems to provide appropriate skill improvement and assessment methods in this field. This study aims to propose objective metrics for hand-movement skills and assess eye-hand coordination. An experimental study is conducted with 15 surgical residents to test the newly proposed measures. Two computer-based both-handed endoscopic surgery practice scenarios are developed in a simulation environment to gather the participants' eye-gaze data with the help of an eye tracker as well as the related hand movement data through haptic interfaces. Additionally, participants' eye-hand coordination skills are analyzed. The results indicate higher correlations in the intermediates' eye-hand movements compared to the novices. An increase in intermediates' visual concentration leads to smoother hand movements. Similarly, the novices' hand movements are shown to remain at a standstill. After the first round of practice, all participants' eye-hand coordination skills are improved on the specific task targeted in this study. According to these results, it can be concluded that the proposed metrics can potentially provide some additional insights about trainees' eye-hand coordination skills and help instructional system designers to better address training requirements.
How Can We Get Benefits of Computer-Based Testing in Engineering Education?
(Computer Applications in Engineering Education, 2010) Özalp Yaman, Şeniz; Özalp Yaman, Şeniz; Çağıltay, Nergiz; Chemical Engineering; Software Engineering
Using computers for assessment can provide several benefits for educators and test-takers. However, in the literature, there is no consensus on the equivalence of paper-and-pencil (P&P) and computer-based test (CBT) environments. Additionally, these studies fail to address the engineering domain. Our main assumption is that, if we could define the confounding factors to satisfy that these two versions of the tests provide equivalent results, then especially in the first year courses of the engineering education programs, we could get several benefits of the CBT environments. Accordingly, in this study, students' performance o different test modes waws evaluated on 209 first year engineering students of a chemistry course. The results of this study showed that there is no significant performance difference between P&P and CBT. By comparing results with the previous studies, this study concludes that personal characteristics of test talers, the features of CBT systems, and the test content are all possible confounding factors when comparing test modes anf need to be considered by the implementers. The results of this study show that once these factors are controlled, students' performance on CBTs and P&P tests in chemistry courses will not vary. This finding is encourging the educators to get benefits of CBTs without any affect on students' performance.
Citation Count: 6
Evaluation of Ten Open-Source Eye-Movement Classification Algorithms in Simulated Surgical Scenarios
(Ieee-inst Electrical Electronics Engineers inc, 2019) Dalveren, Gonca Gökçe Menekşe; Cagiltay, Nergiz Ercil; Çağıltay, Nergiz; Information Systems Engineering; Software Engineering
Despite providing several insights into visual attention and evidence regarding certain brain states and psychological functions, classifying eye movements is a highly demanding process. Currently, there are several algorithms to classify eye movement events which use different approaches. However, to date, only a limited number of studies have assessed these algorithms under specific conditions, such as those required for surgical training programmes. This study presents an investigation of ten open-source eye-movement classification algorithms using the Eye Tribe eye-tracker. The algorithms were tested on the eye-movement records obtained from 23 surgical residents, who performed computer-based surgical simulation tasks under different hand conditions. The aim was to offer data for the improvement of surgical training programmes. According to the results, due to the different classification methods and default threshold values, the ten algorithms produced different results. Considering the fixation duration, the only common event for all of the investigated algorithms, the binocular-individual threshold (BIT) algorithm resulted in a different clustering compared to the other algorithms. Based on the other set of common events, three clusters were determined by eight algorithms (except BIT and event detection (ED)), distinguishing dispersion-based, velocity-based and modified versions of velocity-based algorithms. Accordingly, it was concluded that dispersion-based and velocity-based algorithms provided different results. Additionally, as it individually specifies the threshold values for the eye-movement data, when there is no consensus about the threshold values to be set, the BIT algorithm can be selected. Especially for such cases like simulation-based surgical skill-training, the use of individualised threshold values in the BIT algorithm can be more beneficial in classifying the raw eye data and thus evaluating the individual progress levels of trainees based on their eye movement behaviours. In conclusion, the threshold values had a critical effect on the algorithm results. Since default values may not always be suitable for the unique features of different data sets, guidelines should be developed to indicate how the threshold values are set for each algorithm.
Citation Count: 0
A remote laboratory for training in radio communications
(Ieee, 2007) Kara, Ali; Çağıltay, Nergiz; Oektem, Rusen; Cagiltay, 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.
Citation Count: 4
Classification of Intermediate and Novice Surgeons' Skill Assessment Through Performance Metrics
(Sage Publications inc, 2019) Topallı, Damla; Cagiltay, Nergiz Ercil; Çağıltay, Nergiz; Information Systems Engineering; Software Engineering
Background. Endoscopic surgeries have become an alternative for open procedures whenever possible. For such types of operations, surgeons are required to gain several skills, whose development needs hands-on practice. Accordingly, gaining these skills today is a challenge for surgical education programs. Despite the development of several technology-enhanced training environments, there are still problems to better integrate these technologies into educational programs. For an appropriate integration, it is critical to assess the skill levels and adapt the training content according to the trainees' requirements. In the literature, there exist several methods for assessing these skill levels. However, there are still problems in practice for objective and repetitive assessment. Methods. The present study aims to estimate the skill levels of participants in surgical training programs in an objective manner by collecting experimental data from residents in an endoscopic surgical simulation environment and gathering performance metrics. Results. It is shown that, by comparing the results of a number of classification algorithms for the best accuracy estimation and feature set, the "novice" and "intermediate" skill levels can be estimated with an accuracy of 86%. Conclusions. The outcomes help surgical educators and instructional system designers to better assess the skill levels of the trainees and guide them accordingly. In addition, objective assessments as highlighted in this study can be beneficial when designing technology-enhanced adaptive learning environments.
MEDİKAL EĞİTİMDE ÖĞRETİM TEKNOLOJİLERİNİN ROLÜ VE ÖNEMİ
(2015) Çağıltay, Nergiz; Software Engineering
Günümüzde medikal eğitim süreçleri, son derece zahmetli ve uzun bir eğitim programını içermektedir. Teknolojide yaşanan baş döndüren ilerlemelere rağmen ülkemizde ve dünyada medikal eğitim alanında ciddi gelişmeler elde edilememekte ve yoğunlukla İngilizce “one see-one do-one teach” olarak nitelendirilen ülkemizde ise usta-çırak yaklaşımı olarak bilinen yöntem ile bu eğitimler gerçekleştirilmektedir. Ancak, özellikle çeşitli beceri yeteneklerinin geliştirilmesinin önemli olduğu medikal eğitim programlarında uygulamaya ve deneme yanılmaya yönelik olarak sunulması gereken içeriklerde önemli sıkıntılar yaşanmaktadır. Alanyazında yapılan çalışmalar, yaparak öğrenme, hata yapma ve hatalarından öğrenme, deneme yanılma yolu ile öğrenme gibi yaklaşımların öğrenme süreçlerine olan katkısını ve önemini vurgulamaktadır. Ancak, medikal eğitim süreçleri değerlendirildiğinde bu tür olanakların sağlandığı eğitim-öğretim programlarının hazırlanması aşamasında ciddi problemlerle karşılaşılmakta ve bu süreç çok da kolay olamamaktadır. Gerçek ortamlarda hasta başında bu tür deneyimlerin sunulması, gerek hasta sağlığı açısından, gerek etik kurallar açısından, gerekse hata kaldırmayan bir ortam olması nedeniyle çok mümkün olamamaktadır. Bu sorunları aşabilmek amacıyla, medikal eğitim süreçlerinde deneyime yönelik yeteneklerin kazandırılması amacıyla özel bazı modeller ve düzenekler hazırlanarak öğrencilere bu yeteneklerin kazandırılmaya çalışılması ya da kadavra eğitimlerinin verilmesi ile öğrencilerin deneyimlerinin artırılması sağlanmaktadır. Ancak bu tür düzeneklerin kurulması son derece zahmetli olmakta, tekrarlı bir şekilde bu eğitimlerin sunulmasının sağlanması amacıyla her eğitim seansının sonunda bu düzeneklerin yeniden kurulması gerekmekte ve belli bir kullanım süreci sonunda düzeneklerin tamamen yenilenmesi gerekmektedir. Kadavra eğitimlerinde de benzer sorunlar yaşanmakta, bu tür eğitim programlarını hazırlayan eğitimcilerin özellikle ülkemizde kadavra bulmakta önemli sıkıntılar yaşadıkları ve bu konudaki maliyetlerin son derece önemli boyutlarda olduğu bilinmektedir.
Citation Count: 4
Are Left- and Right-Eye Pupil Sizes Always Equal?
(int Group Eye Movement Research, 2019) Dalveren, Gonca Gökçe Menekşe; Dalveren, Gonca Gokce Menekse; Çağıltay, Nergiz; Information Systems Engineering; Software Engineering
Eye movements provide very critical information about the cognitive load and behaviors of human beings. Earlier studies report that under normal conditions, the left- and right-eye pupil sizes are equal. For this reason, most studies undertaking eye-movement analysis are conducted by only considering the pupil size of a single eye or taking the average size of both eye pupils. This study attempts to offer a better understanding concerning whether there are any differences between the left- and right-eye pupil sizes of the right-handed surgical residents while performing surgical tasks in a computer-based simulation environment under different conditions (left-hand, right-hand and both hands). According to the results, in many cases, the right-eye pupil sizes of the participants were larger than their left-eye pupil sizes while performing the tasks under right-hand and both hands conditions. However, no significant difference was found in relation to the tasks performed under left-hand condition in all scenarios. These results are very critical to shed further light on the cognitive load of the surgical residents by analyzing their left-eye and right-eye pupil sizes. Further research is required to investigate the effect of the difficulty level of each scenario, its appropriateness with the skill level of the participants, and handedness on the differences between the leftand right-eye pupil sizes.
Citation Count: 0
Neuronavigation systems and passive usage problem;
(Institute of Electrical and Electronics Engineers Inc., 2017) Çağıltay, Nergiz; Tokdemir, Gül; Aydın, Elif; Tokdemir,G.; Maras,H.; Tonbul,G.; Topallı, Damla; Department of Electrical & Electronics Engineering; Computer Engineering; Software Engineering; Information Systems Engineering
Nowadays, 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. © 2016 IEEE.
BİR ELEKTRONİK KÜTÜPHANE PROJESİNE BAŞLARKEN
(2001) Çağıltay, Nergiz; Software Engineering
Bu çalışmanın temel amacı, İndiana Üniversitesi elektronik (sayılsal) kütüphane programında halen yürütülmekta olan çalışmalrı incelemektir. Ayrıca, sunulan bilgiler ışığında bu kapsamda ne tür projeler gerçekleştirildiğini irdeleyerek bir elektronik kütüphane projesine nasıl başlanılması gerektiği ve proje aşamalarında nelere dikkat edilmesi gerektiği gibi konularda bir değerlendirme yapmaktır. Bu çalışmanın, ülkemizde bu konuda yapılmakta olan ve yapılması planlanan benzeri projelere ışık tutması amaçlanmıştır.
Citation Count: 0
Using learning style theory in remote laboratory applications
(Ieee, 2007) Çağıltay, Nergiz; Cagiltay, Nergiz Ercil; Software Engineering
Studies have shown that, while learning different concepts, people sometimes use different approaches. These different approaches define individual learning styles. Understanding learning style differences is thus an important step in improving performance of the individuals and educational institutions. In this study, a learning style assessment tool was used to examine the relationship between students' learning styles and their performance in engineering education programs of Atilim University. 329 students (55 female) participated in this study. At their first year in the program, students' learning styles are measured by a learning style assessment tool developed by David Kolb. The results show that, at the Atilim University's engineering education program, most of the students are having assimilator type of learning style (45%). Convergers (27%) and divergers (22%) follow the assimilators. The number of accommodators is very limited (5%). This information can be used to create adaptive teaching environments in distance education courses.

Çağıltay, Nergiz

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Scholarly Output

131

Articles

75

Citation Count

909

Supervised Theses

27

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