TR-Dizin İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://gcris.yasar.edu.tr/handle/123456789/11291

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Citation - WoS: 4
Citation - Scopus: 4
A Canonical 3-D P53 Network Model that Determines Cell Fate by Counting Pulses
(ISTANBUL UNIV FAC ENGINEERING, 2018) Gokhan Demirkiran; Guleser Kalayci Demir; Cuneyt Guzelis; Güzeliş, Cüneyt; Demirkıran, Gökhan; Demir, Güleser Kalaycı
From a system theory perspective p53 network dynamics is interesting since it can exhibit three dynamical modes of p53 namely low-level equilibrium oscillation and high-level equilibrium. Each of these modes are associated with different cell fate outcomes: cell survival cell cycle arrest and apoptosis. The literature reveals that a high level (apoptosis) is seen only after ending the oscillation phase so called two-phase dynamics which provides the decision of apoptosis depending on the oscillation duration. This paper proposes that a negative feedback can keep time by counting the pulses of oscillation to take the decision of apoptosis or cell survival. P53DINP1 which is the mediator of this feedback is added as a variable to a 2-D oscillator model of the p53 network. The resulting canonical 3-D model successfully replicates the two-phase dynamics. That is it possesses temporary oscillatory behavior in which first oscillations (first phase) and then high level state (second phase) are observed. By introducing a new variable to the core oscillator in the p53 network this study demonstrates that p53 network can be considered a modular structure which consists of an oscillator and other variables that control this oscillator to contribute to cell fate determination.
Citation - WoS: 3
Citation - Scopus: 3
A COMPARATIVE STUDY ON THE EXERGOECONOMIC ANALYSIS OF TEXTILE DRYERS USING SPECO METHOD
(EGE UNIV, 2012) Ahmet Cay; Isik Tarakcioglu; Arif Hepbasli; Hepbaşlı, Arif; Çay, Ahmet; Tarakçıoğlu, Işık
This study reveals the exergoeconomic analysis of stenters by using Specific Exergy Costing (SPECO) method. The cost balances and auxiliary thermoeconomic relations were developed for direct gas heated (DGHS) and hot oil heated (HOHS) stenters by the application of the control volume models. The exergy cost of the evaporation of water was selected to be the main parameter. It was shown that the falling-rate period of drying led to the highest exergy costs while exergy costs varied between 0.19 US$/GJ and 0.59 US$/GJ depending on the drying periods. Increasing the exhaust air humidity ratio and the residual moisture content of the fabric outlet decreased the exergy costs linearly.
Citation - WoS: 4
Citation - Scopus: 4
A Comprehensive Evaluation of Yacht Charter Service Concept: Influence of Voyager-to-Voyager Interaction on Service Satisfaction
(GALENOS PUBL HOUSE, 2021) Neslihan Paker; Osman Gok; Paker, Neslihan; Gök, Osman
The study attempts to evaluate yacht charter service attributes considering the service quality customer satisfaction and loyalty three-leg framework. Besides visited destinations the service concept is enlarged with social servicescape dimensions of interaction quality and customer similarity for a holistic approach. A self-administered questionnaire was provided to 359 customers and the relationships in the research model were tested via structural equation modeling. The results showed that satisfaction depends on the interaction quality which is strongly related to the similarity between other customers as well as the quality of the service elements and the attractiveness of the visited destination. This study presents a pioneering research attempt focusing on the influence of customer-to-customer interaction and customer similarity on yacht charter services. Findings of the study provide a theoretical contribution highlighting the importance of customer-to-customer interaction for service appraisals of customers. Theoretical and practical implications for interaction-dominant services are discussed.
A Comprehensive Overview of Foreign Language Teachers' Professional Development: Self-directed and Institutional Professional Development Activities of English Teachers in Turkey
(Turkish Education Association, 2024) Çaǧri Özköse-Biyik; Oner Uslu; Bıyık, Çağrı Özköse; Uslu, Öner
When the literature on the professional development of English as a foreign language (EFL) teachers is examined professional development predominantly encompasses institutional activities. This study critically examines conventional definitions and practices related to the professional development of EFL teachers arguing that in line with the demands of the era teachers' professional development should also include self-directed individual activities. However for professional development activities to contribute to the ultimate goal of student learning it is important for the organizational culture in which teachers are situated to be supportive of their professional development. To seek answers to research questions about how the institutional and self-directed activities carried out by EFL teachers in Türkiye and the organizational culture influence these activities an exploratory sequential strategy was employed in the research. First qualitative data were collected and then quantitative data were collected through a survey tool developed based on the qualitative data. Comprehensive individual interviews were conducted with a total of 28 teachers across Turkey and survey data were collected from 819 teachers. The findings are presented as self-directed (unstructured) professional development activities (e.g. use of search engines reading news websites watching videos/series etc.) and institutional (structured) professional development activities (participation in national and international conferences etc.). The necessity of foreign language teachers being involved in many individual activities through self-direction beyond their participation in activities planned by institutions for the professional development of a foreign language teacher is discussed. The study proposes a comprehensive perspective on the concept of professional development related to EFL teachers and offers recommendations for the field of foreign language teacher education. © 2024 Elsevier B.V. All rights reserved.
Citation - WoS: 40
Citation - Scopus: 55
A Comprehensive Review of Feature Selection and Feature Selection Stability in Machine Learning
(GAZI UNIV, 2023) Mustafa Buyukkececi; Mehmet Cudi Okur; Buyukkececi, Mustafa; Okur, Mehmet Cudi
Feature selection is a dimension reduction technique used to select features that are relevant to machine learning tasks. Reducing the dataset size by eliminating redundant and irrelevant features plays a pivotal role in increasing the performance of machine learning algorithms speeding up the learning process and building simple models. The apparent need for feature selection has aroused considerable interest amongst researchers and has caused feature selection to find a wide range of application domains including text mining pattern recognition cybersecurity bioinformatics and big data. As a result over the years a substantial amount of literature has been published on feature selection and a wide variety of feature selection methods have been proposed. The quality of feature selection algorithms is measured not only by evaluating the quality of the models built using the features they select or by the clustering tendencies of the features they select but also by their stability. Therefore this study focused on feature selection and feature selection stability. In the pages that follow general concepts and methods of feature selection feature selection stability stability measures and reasons and solutions for instability are discussed.
A Design Proposal for Improving Daylight Availability of a Deep-Plan Classroom by Using Tubular Daylight Guidance Systems and Movable Shading Devices
(GAZI UNIV, 2024) Arzu Cilasun Kunduraci; Ecenur Kizilorenli; Cilasun Kunduraci, Arzu; Kunduracı, Arzu Cılasun; Kızılörenli, Ecenur
The use of daylight in educational settings has a significant impact on the well-being attention and academic achievement of students. However providing adequate daylighting without glare can be difficult especially in deep-plan layout classrooms because daylight is not constant and its strength varies with distance from the facade necessitating the use of additional solutions frequently. In this study tubular daylight guidance systems (TDGS) and movable shading devices are proposed to increase daylight availability in the Yasar University Faculty of Architecture Temporary Studio which has a deep plan layout and receives daylight only from the southeast facade. The objective was to meet the LEED daylight evaluation requirements for each zone which require sDA to be at least 55% and ASE to be at most 10% in the selected analysis area. To propose TDGS and movable shadings with the most efficient angles and positions, Rhinoceros Grasshopper and Climate Studio were used and simulation results were validated by real -time measurements. The design proposal simulation results achieved a significant increase in daylight availability in the rear part of the room (zone 2-3) while glare was diminished near the facade (zone1). The proposed design strategy improved daylight availability through the room demonstrating that the systems perform well together.
Citation - Scopus: 10
A genetic algorithm to solve the multidimensional Knapsack problem
(Association for Scientific Research membranes@mdpi.com, 2013) Murat Erşen Berberler; Asli Guler; Urfat Nuriyev; Berberler, Murat Ersen; Guler, Asli; Nuriyev, Urfat G.
In this paper The Multidimensional Knapsack Problem (MKP) which occurs in many different applications is studied and a genetic algorithm to solve the MKP is proposed. Unlike the technique of the classical genetic algorithm initial population is not randomly generated in the proposed algorithm thus the solution space is scanned more efficiently. Moreover the algorithm is written in C programming language and is tested on randomly generated instances. It is seen that the algorithm yields optimal solutions for all instances. © 2020 Elsevier B.V. All rights reserved.
A review of substrate integrated waveguide (SIW) filter architecture and filter design technologies
(GAZI UNIV FAC ENGINEERING ARCHITECTURE, 2024) Kemal Guvenli; Sibel Yenikaya; Mustafa Secmen; Güvenli, Kemal; Yenikaya, Sibel; Seçmen, Mustafa
In this review article transmission line technologies are compared in terms of loss dimension production cost ease of integration and design complexity. The basic design stages of the Substrate Integrated Waveguide (SIW) filter which stands out with its advantages among transmission lines are given. Current studies using different SIW filter technologies have been examined in the literature. The quality factors of the examined SIW filters were calculated and a comparison was made between the applied techniques. In addition the methods applied in the literature to eliminate the harmonic and high mode effects that adversely affect the SIW filter performance are examined and the results are evaluated.
A Spatial Reflection of Social Transformation: Taksim Municipal Gazino 1939
(ISTANBUL UNIV RESEARCH INST TURKOLOGY DEPT ART HISTORY, 2024) Begum Sena Onal Ozmalatyalilar; Meltem O. Gurel; Gurel, Meltem O.; Önal, Begüm Sena; Ozmalatyalilar, Begum Sena Onal; Gürel, Havva Meltem; Önal Özmalatyalilar, Begüm Sena
Taksim Municipal Gazino which hosted its visitors inside the Inonu Promenade between 1939 and 1967 was one of the leading examples of gazinos (an entertainment venue) built with the support of the state in the early republican era in Turkey. Designed by the municipality architect Ruknettin Guney within the scope of French city planner Henri Prost's Istanbul Master Plan the edifice was a quintessential example of modern architecture that epitomized the state's Westernization ideology. This article examines the gazino practice as a spatial reflection of social transformation by presenting a historical and spatial reading of the Taksim Municipal Gazino. The study analyzes the gazino structure as a power mechanism that produces secular identities by focusing on the dialectic between the spaces in the building and the experiences of its patrons. The analysis of architectural drawings photographs and literary works associated with the building on the one hand reveals how the architect operating as a cultural leader utilized architectural creation to present the Western lifestyle to society. On the other hand it indicates that Taksim Municipal Gazino served as a platform for individuals to display their modernity. Moreover the study propounds that the building contributed to the modernization process of the newly established nation-state and it has served as a spatial tool that notably strengthened the position of female regulars in the public sphere.
Citation - WoS: 4
Citation - Scopus: 4
African Studies in Turkey
(ULUSLARARASI ILISKILER KONSEYI DERNEGI, 2016) Elem Eyrice Tepeciklioglu; Eyrice Tepeciklioğlu, Elem; Eyrice, Elem Tepeciklioğlu
This article aims at providing an analysis of African studies as a recently emerging field of study in Turkish academia. For many years African issues had low priority in both policy and academic circles. The article argues that the recent scholarly interest in African issues is largely a product of the increasing political interest towards the continent. Although the existing literature mostly concentrates on Turkish-African relations and the study of particular African issues remain limited in number African studies in Turkey has made progress and is still evolving with an expanding and diversifying literature.
Citation - WoS: 2
An Analysis of Factors Affecting Credit Scoring Performance in SMEs
(EGE UNIV FAC ECONOMICS & ADMIN SCIENCES, 2019) Ebru Saygili; Arikan Tarik Saygili; Gokhan Isik; Isik, Gokhan; Saygili, Arikan Tarik; Saygili, Ebru; Esendemirli, Ebru
In small and medium enterprises (SMEs) both financial and non-financial indicators related to the company and the large shareholder have significant effects on credit scores. This study explores the hybrid nature of SME credit scoring systems by developing an SME credit scoring model with general indicators financial indicators and intelligence indicators related to the company and the major shareholder. This study is the first to explore the effect of intelligence indicators in credit scoring. It used regression analysis to evaluate real data from 125 SMEs operating in Turkey. Of 17 independent variables 9 had statistically significant relationships with SME credit scores. The paper includes a comprehensive discussion of the implications of these findings.
Citation - WoS: 1
Citation - Scopus: 1
An Empirical Evaluation of Feature Selection Stability and Classification Accuracy
(GAZI UNIV, 2024) Mustafa Buyukkececi; Mehmet Cudi Okur; Büyükkeçeci, Mustafa; Okur, Mehmet
The performance of inductive learners can be negatively affected by high -dimensional datasets. To address this issue feature selection methods are used. Selecting relevant features and reducing data dimensions is essential for having accurate machine learning models. Stability is an important criterion in feature selection. Stable feature selection algorithms maintain their feature preferences even when small variations exist in the training set. Studies have emphasized the importance of stable feature selection particularly in cases where the number of samples is small and the dimensionality is high. In this study we evaluated the relationship between stability measures as well as feature selection stability and classification accuracy using the Pearson 's Correlation Coefficient (also known as Pearson 's Product -Moment Correlation Coefficient or simply Pearson's r ). We conducted an extensive series of experiments using five filter and two wrapper feature selection methods three classifiers for subset and classification performance evaluation and eight real -world datasets taken from two different data repositories. We measured the stability of feature selection methods using a total of twelve stability metrics. Based on the results of correlation analyses we have found that there is a lack of substantial evidence supporting a linear relationship between feature selection stability and classification accuracy. However a strong positive correlation has been observed among several stability metrics.
Citation - WoS: 33
Citation - Scopus: 36
Antecedents to supply chain innovation
(EMERALD GROUP PUBLISHING LTD, 2020) Fatma Nur Karaman Kabadurmus; Kabadurmus, Ozgur; Karaman Kabadurmus, Fatma Nur; Kabadurmuş, Fatma Nur Karaman
Purpose The purpose of this study is to examine organizational and environmental (competition capital scarcity and organization of labor) factors that affect firms' innovation activities within the supply chain. Design/methodology/approach This study empirically examines the factors that affect firms' innovation activities using firm-level data from the last round of Business Environment Enterprise Performance Surveys (BEEPS). The analysis covers major supply chain functions: production delivery and support systems. Findings The study shows that drivers of innovation vary with the type of innovation activity, as such innovation efforts across supply chain functions should prioritize strategic resources that will create competitive advantages. Our results also reveal that sustainability efforts in the Eastern Europe and Central Asia (EECA) region should prioritize labor market reforms over capital market reforms. Originality/value Current research on innovation and supply chain issues does not explicitly analyze innovations that occur in different sustainable supply chain functions and empirical studies that focus on the determinants of innovations in the supply chain network are very limited. The data used in this study cover 30 economies in EECA many of which are low- and middle-income countries and thus contribute to the implementation of sustainable practices in developing countries.
Barriers in Sustainable Lean Supply Chain Management: Implementation in SMEs
(EGE UNIV FAC ECONOMICS & ADMIN SCIENCES, 2025) Ebru Takci; Erhan Ada; Yigit Kazancoglu; Takci, Ebru; Ada, Erhan; Kazancoglu, Yigit
As the world undergoes significant transformations in various domains including technology energy supply and communication the idea of sustainability has become a significant issue. This study investigates the barriers to Sustainable Lean Supply Chain (SLSC) management within Small and Medium-Sized Enterprises (SMEs) and explores the structural interrelationships among these barriers. A comprehensive literature review was carried out to recognize critical elements relevant to the research topic resulting in the identification of fifteen specific elements that account for 85% of the barriers in SLSC management. The DEMATEL method was used to evaluate the significance and influence levels of these factors. Furthermore structured in-depth interviews were conducted with ten experts representing sectors that constitute 85% of the SMEs operating in Kayseri Organized Industrial Zone (OIZ) Turkey including metal products furniture plastic packaging construction materials textiles and food. The findings reveal that strategies represent the most significant barrier to SLSC management in SMEs. The barriers were analyzed in two dimensions: influencing and influenced factors. The primary influencing factor identified was laws standards regulations and legislation while the most significant influenced factor was found supply and suppliers. The study concludes with findings and actionable recommendations for practitioners and decision-makers.
Citation - WoS: 3
Citation - Scopus: 1
⊕-co-coatomically supplemented and co-coatomically semiperfect modules
(HACETTEPE UNIV FAC SCI, 2018) Rafail Alizade; Serpil Gungor; Alizade, Rafail; Gungor, Serpil
In this paper it is shown that a factor module of an circle plus-co-coatomically supplemented module is not in general circle plus-co-coatomically supplemented. If M is circle plus-co-coatomically supplemented and U is a fully invariant submodule of M then M/U is circle plus-co-coatomically supplemented. A ring R is left perfect if and only if R-(N) is an circle plus-co-coatomically supplemented R-module. A projective module M is co-coatomically semiperfect if and only if M is circle plus-co-coatomically supplemented. A ring is semiperfect if and only if every finitely generated free R-module is co-coatomically semiperfect.
Citation - Scopus: 1
Compact dual-band rectangular TE10 mode to circular TM01 mode converter for telemetry/telecommand applications in satellite communication: design equivalent circuit modeling mode level measurement technique and 3d printed manufacturing
(Turkiye Klinikleri, 2022) Esra Alkın; Ceyhan Türkmen; Mustafa Seçmen; Secmen, Mustafa; Türkmen, Ceyhan; Alkın, Esra
In this study the design of a dual-band mode converter which provides transition from rectangular waveguide TE10 mode to circular waveguide TM01 mode and operates simultaneously in telemetry/telecommand (TT&C) frequencies is presented along with its equivalent circuit and a mode level measurement technique. This dual-band converter is designed to uniformly excite TT&C slot antennas used in satellite communication with symmetric circular TM01 mode. The structure can work as a transceiver due to having one common rectangular waveguide feed. As a Ku-band application a converter giving high purity TM01 mode at circular waveguide at 11.75 GHz/TX and 13.75 GHz/RX center frequencies is designed and manufactured with 3D printing technology. Approximate equivalent circuit models of the designed structure are extracted by using lumped elements from simulated S-parameter results. In addition a measurement technique to detect the normalized power levels of different propagation modes in dual-band mode converter is applied on the manufactured structures to obtain transmission levels of circular TM01 mode and suppression levels of circular TE11 mode. It is revealed from the measurement results that while the designed structure gives more than 17.5 dB return loss and suppression of TE11 mode and less than 0.6 dB insertion loss of TM01 mode within 500 MHz bandwidth at TX band it gives more than 23 dB return loss and suppression of TE11 mode and less than 0.3 dB insertion loss of TM01 mode within 900 MHz bandwidth at RX band. © 2023 Elsevier B.V. All rights reserved.
Comparison of Substance Use and Personality Characteristics and Psychiatric Symptoms of Individuals Using Cannabis and Synthetic Cannabinoids with Healthy Controls
(AVES, 2022) Hande Çelikay Söyler; Ayşe Ender Altintoprak; Soyler, Hande Celikay; Altintoprak, Ayse Ender
In this study substance use personality traits and psychiatric symptoms of individuals using cannabis and synthetic cannabinoid were examined and compared with healthy controls. A total of 52 participants who applied to Ege University Faculty of Medicine Department of Mental Health and Diseases Substance Addiction Treatment Center between March 2015 and June 2017 who used cannabis for at least 1 year in the past and 51 participants who used synthetic cannabinoids for at least 1 year in the past constituted the participant group with a history of substance use and 57 Ege University employees/ students without any substance use history constituted the control group participants. The age range was determined as 18–54. Hacettepe Personality Inventory was used to evaluate the personality traits of the par-ticipants and the Symptom Screening Test-90 was used to examine the psychopathological symptom levels. Participants with a history of synthetic cannabinoid use evaluated by Hacettepe Personality Inventory had a significantly lower score on general adjustment personal adjustment social adjustment self-actualization emotional stability neurotic tendencies psychotic symptoms family relations social relations social norms antisocial tendencies sub-dimensions and they scored significantly higher in all Symptom Screening Test 90 sub-dimensions. The study suggests that adding social adaptation and psychoeducational programs to medical and psycho-social improvement studies in the field of addiction will increase success. © 2023 Elsevier B.V. All rights reserved.
Citation - WoS: 3
Citation - Scopus: 4
Damping wide-area oscillations in power systems: A model predictive control design
(Turkiye Klinikleri Journal of Medical Sciences Talapapa Bulvary no. 102 Hamammonu 1 06230, 2018) Emrah Biyik; Munir Aminu Husein; Bıyık, Emrah; Huseın, Munir
Electromechanical oscillations in power systems have been observed ever since synchronous generators were interconnected to provide reliability and higher generation capacity and they have become a severe threat for the safe and economic operation of modern interconnected power grids. To dampen these oscillations wide-area damping controllers (WADCs) have been introduced by utilizing wide-area measurement systems and synchronized phasor measurement units. In this paper we present a systematic approach for designing WADCs using a model predictive control (MPC) technique to damp interarea oscillations in the power system. The MPC controller computes optimal control signals for the excitation system of a remote generator where it will supplement the local power system stabilizers that are used as damping controllers. The performance of the proposed approach has been assessed on the IEEE 16-generator 68-bus test system and it is shown that the interarea oscillations can be effectively and robustly damped under varying operation conditions. © 2018 Elsevier B.V. All rights reserved.
Design of job assignment and routing policies in service logistics
(PAMUKKALE UNIV, 2019) Zehra Duzgit; Ayhan Ozgur Toy; Simge Coban; Zeynep Alibasoglu; Ozlem Tok Ozkeskin; Mert Karakaya; Yucel Bayrak; Tok Ozkeskin, Ozlem; Çoban, Simge; Özkeskin, Özlem Tok; Alibaşoğlu, Zeynep; Bayrak, Yücel; Toy, Ayhan Özgür; Karakaya, Mert; Düzgit, Zehra
In this study we consider to improve efficiency of an after-sales technical service in home appliances industry. The efficiency measure is the total time spent in a day to serve customer requests. Hence the objective is to minimize total working hours spent in a day in the aftersales services. We first analyze the system to identify causes of delays in job completion. Upon findings of our analysis we choose to focus on job assignment and job sequencing to improve efficiency. We propose a mixed integer programming model for the assignment of technicians to jobs and sequencing of jobs for each technician to minimize total time spent in a day. Through this model we solve the problem with expected job durations. We present a numerical study to illustrate the proposed solution procedure.
Development of a Scoring Rubric to Assess Training in an Immersive Experience Environment
(HACETTEPE UNIV, 2025) Esma Cukurbasi Calisir; Eralp Altun; Yasin Ozarslan; Çalışır, Esma Çukurbaşı; Cukurbasi Calisir, Esma; Altun, Eralp; Özarslan, Yasin
This research focuses on the development of a scoring rubric (SR) designed to assess occupational health and safety (OHS) training delivered through immersive experience environments. To this end an immersive training module was implemented in the field of electrical safety supported by immersive technologies. The participants were 30 students enrolled in the electrical program of a public university located in the Aegean region. The primary goal was to enhance participants' awareness of occupational safety and to improve their practical skills in managing potentially hazardous situations. For performance assessment each participant was independently evaluated by three raters using the developed rubric. The collected data were analyzed through Intraclass Correlation Coefficient (ICC) and Generalizability Theory (G-Theory). The ICC analysis yielded a coefficient of 0.936 indicating a strong level of inter-rater consistency. G-Theory results supported the high reliability of the evaluations. Additionally expert evaluations contributed to the validation process of the rubric. Overall the findings indicate that the SR is a valid and reliable tool for evaluating learning performance in immersive OHS training contexts.

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