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Master Thesis Yapısal ve merkezi olmayan sayısal ortamların süreç eşleme performansları hakkında bir inceleme(2007) Çakır, Buğra; Kılıç, Hürevren; Öztoprak, Kasım; Computer Engineering; Computer Engineering; Computer EngineeringVerimli es¸leme, yapısal ve merkezi olmayan sayısal ortamlarda problem tes¸kil etmektedir. Bu tezde s¨ozkonusu ortamlara odaklanılarak, ortamlarn es¸leme performanslarını ¨olc¸me amac¸lı benzetimler gerc¸ekles¸tirilmis¸tir. Calısmada, P2P(HyperGrid, basuclu (ultrapeer) ve bas¸uc¸'suz Gnutella), Kucuk-dunya (Small-World, Watts-Strogatz), ve us kanunu (power-law) da˘gılımını g¨osteren Ozerk Waxman sisteminin a˘gır-kuyruklu (heavy-tailed) ¨ uygulaması, rasgele (random), iki boyutlu-ızgara (2D-Grid) gibi farklı ortam modelleri dikkate alınmıs¸tır. Es¸leme amacıyla, s¨urec¸ kars¸ılas¸malarına olanak tanıyan akıs¸ mekanizmasının Bilgilendirilmemis¸ Once-Enlemesine-Arama oldugu kabullenilmis¸tir. Benzetimlerde, rasgele ortamın es¸leme performansının neredeyse di˘ger t¨um problemlere ve eszamanlı yapılandırmaya oranla performans ustunlugu gozlenmektedir. Ancak, kucuk-dunya ortamı modelinin toplam maliyeti neredeyse t¨um kurulumlar ic¸inde en yuksek olanıdır. Sozluk Terimler: Yapısal ve merkezi olmayan ortamlar, Surec¸ esleme, Performans, BenzetimArticle Citation - WoS: 4Citation - Scopus: 4Simulation of Through-Hardening of Sae 52100 Steel Bearings - Part Ii: Validation at Industrial Scale(Wiley-v C H verlag Gmbh, 2016) Evcil, G. E.; Mustak, O.; Simsir, C.In this study, the material dataset presented in part I of this article is validated at industrial scale in batch through-hardening of bearing races. The material dataset acquired is implemented in a commercial heat treatment simulation software. Heat transfer coefficients for the oil and salt bath are determined by using a commercial standard quench probe. Zone temperatures and transfer times of the roller-belt furnace are measured directly from the system. Through-hardening of inner ring (IR) of 6813 bearing in oil and salt bath is simulated considering most of the industrial details. Finally, predicted dimensional changes are compared with the coordinate measurement results and a good agreement is achieved. It is concluded that determined material and process data, idealizations and simulation procedure can be considered "validated" for further improvement of the industrial process.Conference Object The Borderline Between Serious Games and Simulations(Iated-int Assoc Technology Education & development, 2014) Guney, Sinem; Cagiltay, Nergiz Ercil; Tuner, Emre; Cereci, IbrahimGame and simulation-based environments allow trainees to develop motor and cognitive skills as well as to provide some very detailed measurement values which in turn provide a feedback mechanism. It is a well known fact that games and simulation are potentially creating safer and cheaper active learning environments. Even when several benefits of games and simulations are reported in the literature, there is no exact definition of a game and simulation drawing the borders in between. Hence this causes to some complexities and misunderstandings in the field. Accordingly, in this study a definition for simulations and games is searched by being based on the studies found in the literature. Based on these definitions a borderline for the games and simulations will be provided. Results of study aim to guide the educational technology designers by better defining their education designs and better understanding their affect on the educational environments.Conference Object Artificial Intelligence Techniques for Performance Simulation: Solid Oxide Fuel Cells V-J Curve Prediction Via Artificial Neural Networks(ENEA, 2017) Baldinelli,A.; Barelli,L.; Bidini,G.; Bonucci,F.; Iskenderoğlu,F.C.For their high flexibility of operation, Solid oxide fuel cells (SOFCs) are promising candidates to coach the transition towards cleaner and efficient energy generation. Yet, SOFC performance might be markedly affected by fuel composition variability and operative parameters. For that, a reliable simulation tool is necessary for SOFC performance, to optimize its working point and to provide a suitable control. Given the high variability ascribed to the fuel and the electrochemical system high nonlinearity, the implementation of artificial intelligence techniques, like Artificial Neural Networks (ANNs), is worth considering. In ANNs, the correlation between system inputs and outputs is handled by virtual neurons, establishing in-out correlations without entering in knotty kinetics and material properties issues. For what above, a suitably sized experimental campaign is to be designed to provide a large data-set. This to guarantee high ANN performance in the voltage estimation and, at the same time, a wide application domain of the neural simulator. © EFC 2017 - Proceedings of the 7th European Fuel Cell Piero Lunghi Conference.Conference Object Citation - WoS: 6Simulation-Based Environments for Surgical Practice(Ieee, 2017) Dalveren, Gonca Gokce Menekse; Cagiltay, Nergiz Ercil; Ozcelik, Erol; Maras, HakanModeling and simulation environments provide several insights about the real situations such as endoscopic surgery. Endoscopic surgery requires both hand skills, so, understanding the effect of using dominant or non dominant hand on mental workload is important to better design, develop and implement modeling and simulation environments to support real-life implementations of surgical procedures. This experimental study presents a simulation application of eye-tracking approach to understand mental workload in different hand conditions: dominant hand, non-dominant hand and both hand. The results of the study show that, performing simulated surgical tasks by both hands compared to dominant hand, increases mental workload which is evident by higher pupil size. Accordingly, to manage the mental-load problems of surgeons while performing complex tasks that require both hand usage simulation-based environments can be used. Consequently, collection of detailed information such as eye-data, can give several insights about the behaviors of the surgeons. Also, their required skills can be improved by development of simulation and training environments.Conference Object Citation - Scopus: 2Personality Type Indicator Models in Serious Games: a Case Study in a Surgical Navigation Game(Institute of Electrical and Electronics Engineers Inc., 2015) Menekse,G.G.; Cagiltay,N.E.; Ozcelik,E.Serious games are a popular concept in both the research and commercial areas. It is agreed that the concept refers to the use of computer games without the main purpose of pure entertainment. In addition to being entertaining, they have some additional educational or training objectives as well. Serious games are used in different areas such as military, government, educational, corporate, and healthcare. However, according to their individual differences, it is not always possible to provide such an educational environment that fits expectations and preferences of all audience. Hence, personalization is becoming an essential issue in serious game environments, which focus on a human-centered paradigm aiming to provide adaptive and personalized services to the users according to the context. However, how such a personalization should be affectively implemented in the design of serious games is a challenge. This study aims to better understand the affect of personality types on game play. For this purpose, a game-based simulation environment which also records all details of the player during the performance of several tasks in the game play was used. Twenty nine students were asked to play the simulation game. Additionally, their personality types were collected based on the theory of psychological types by Carl Jung, the Myers-Briggs Type Indicator (MBTI) which measures personality preferences as defined by Four Dichotomous pairs of mental functions or attitudes. The correlation between these personality types and individual performance measures of players during the game play was analyzed. However no significant correlation between game parameters and the players' personality types has been recorded. This may be because of the limited number of participants that need to be examined in the future studies. © 2015 IEEE.Conference Object Citation - Scopus: 8Simulation-Based Environments for Surgical Practice(Institute of Electrical and Electronics Engineers Inc., 2017) Dalveren,G.G.M.; Çağıltay,N.E.; Özçelik,E.; Maraş,H.Modeling and simulation environments provide several insights about the real situations such as endoscopic surgery. Endoscopic surgery requires both hand skills, so, understanding the effect of using dominant or non dominant hand on mental workload is important to better design, develop and implement modeling and simulation environments to support real-life implementations of surgical procedures. This experimental study presents a simulation application of eye-tracking approach to understand mental workload in different hand conditions: dominant hand, non-dominant hand and both hand. The results of the study show that, performing simulated surgical tasks by both hands compared to dominant hand, increases mental workload which is evident by higher pupil size. Accordingly, to manage the mental-load problems of surgeons while performing complex tasks that require both hand usage simulation-based environments can be used. Consequently, collection of detailed information such as eye-data, can give several insights about the behaviors of the surgeons. Also, their required skills can be improved by development of simulation and training environments. © 2017 IEEE.Conference Object Citation - Scopus: 1Parametric Study and Seasonal Simulations of a Solar Powered Adsorption Cooling System(Brazilian Society of Mechanical Sciences and Engineering, 2009) Taylan,O.; Baker,D.K.; Kaftanoʇlu,B.Models of solar-thermal powered adsorption cooling systems with and without heat recovery developed in TRNSYS and results from steady-periodic and seasonal simulations are presented. A normalized model is presented and used to process the seasonal TRNSYS results to investigate the coincidence between the solar-supplied cooling power and cooling load as the relative sizes of the cooling system and storage are varied. The normalized model yields a seasonal solar fraction and seasonal loss fraction (the excess solar-supplied cooling lost to the environment due to insufficient storage). Simulations were run for a zeolite-water adsorbent-refrigerant pair. Hourly weather data for Antalya, Turkey, were used for the transient simulations. Basic trends in performance were investigated as the following parameters were varied: system type (with or without heat recovery); incident radiation; maximum and minimum bed temperatures; condensation temperature; difference between condensation and minimum bed temperatures (bed excess temperature); bed's dead mass; collector type (flat plate vs. evacuated tube); cooling tower type (wet vs. dry); cooling system size; and, storage size. Results for the conditions explored include the following. Steady-periodic simulations show that the system's COP decreases with decreases in radiation and increases with minimum bed and condensation temperatures. Increasing the excess bed temperature increases the system's COP. Systems with an evacuated tube collector and wet cooling tower give higher system COP's than systems with a flat plate collector and dry cooling tower. The increase in system's COP due to decreasing the bed's dead mass and adding heat recovery is quantified. The solar fraction increases and the loss fraction decreases with increases in storage capacity, and both fractions decrease with increases in maximum bed temperature. The required evacuated tube collector area is smaller than the flat plate collector area while the required mass of adsorbent is independent of collector and adsorption cycle types. © 2009 by ABCM.Conference Object Citation - WoS: 1Personality Type Indicator Models in Serious Games: a Case Study in a Surgical Navigation Game(Ieee, 2015) Menekse, G. G.; Cagiltay, N. E.; Ozcelik, E.Serious games are a popular concept in both the research and commercial areas. It is agreed that the concept refers to the use of computer games without the main purpose of pure entertainment. In addition to being entertaining, they have some additional educational or training objectives as well. Serious games are used in different areas such as military, government, educational, corporate, and healthcare. However, according to their individual differences, it is not always possible to provide such an educational environment that fits expectations and preferences of all audience. Hence, personalization is becoming an essential issue in serious game environments, which focus on a human-centered paradigm aiming to provide adaptive and personalized services to the users according to the context. However, how such a personalization should be affectively implemented in the design of serious games is a challenge. This study aims to better understand the affect of personality types on game play. For this purpose, a game-based simulation environment which also records all details of the player during the performance of several tasks in the game play was used. Twenty nine students were asked to play the simulation game. Additionally, their personality types were collected based on the theory of psychological types by Carl Jung, the Myers-Briggs Type Indicator (MBTI) which measures personality preferences as defined by Four Dichotomous pairs of mental functions or attitudes. The correlation between these personality types and individual performance measures of players during the game play was analyzed. However no significant correlation between game parameters and the players' personality types has been recorded. This may be because of the limited number of participants that need to be examined in the future studies.Master Thesis Doğurgan Ağ Özdevinirlerin Yerel Davranış Tanıması(2010) Özdemir, Burak; Kılıç, HürevrenBir bütün ve onu oluşturan parçaların kendi aralarındaki ilişkisi, karmaşık ayrık dinamik sistemler bağlamında önem taşımaktadır. Bu amaçla, Doğurgan Ağ Özdeviniri şeklinde tanımlanan genel verilerden yerel davranış tanımlama algoritması geliştirilmiştir. Sabit kural-uzayı düzenlemesine sahip Özdevinir Ağları kullanarak sonlu Doğurgan Ağ Özdevinirlerinin tanınması ve benzetimi amacıyla bir izlek tasarlanabilirliği gösterilmiştir. ?Üst seviye bileşen etkileşimi? adı verilen bir soyutlama sunulmuştur. Ayrıca, Doğurgan Ağ Özdevinirleri için bir tanımlama yönteminin varlığı gösterilmiştir. Pratikte, model inşasına yönelik otomatikleştirilmiş bir yaklaşım sağlanmıştır ve geliştirilen yaklaşım Doğurgan Ağ Özdevinirlerini esas alan sistem modelleme girişimlerinde kullanılabilmektedir.
