AN INVESTIGATION OF SELF-EFFICACY, LOCUS OF CONTROL, AND ACADEMIC PROCRASTINATION AS PREDICTORS OF ACADEMIC ACHIEVEMENT IN STUDENTS DIAGNOSED AS GIFTED AND NON-GIFTED

The overall objective of this study was to investigate self-efficacy, locus of control, and academic procrastination as predictors of academic achievement in students identified as gifted or non-gifted (normal). Another purpose of the study was to analyze whether there was a difference between the self-efficacy, locus of control, and academic procrastination scores of the students in both groups. The study group consisted of 6th, 7th, and 8th-grade students, some of whom were Science and Art Centers students who were diagnosed as gifted, while others were public school students who were not diagnosed as gifted. The data of the study were collected using the Self-Efficacy Questionnaire for Children, the Internal-External Locus of Control Scale, and the Academic Procrastination Scale. The Pearson Product-Moment Correlation Coefficient, the Independent Samples t-Test, and simple and multiple linear regression were employed to analyze the data. According to the results, it can be said that academic procrastination has an important role in the academic achievement of gifted students, whereas self-efficacy, locus of control, and academic procrastination have a significant part to play in the academic achievement of non-gifted students. The comparison of self-efficacy, locus of control, and academic procrastination scores of gifted and non-gifted students indicated that the self-efficacy scores of gifted students were significantly higher than those of the non-gifted.  Article visualizations

Adaptation of career goal feedback scale to Turkish: validity and reliability study

Bu çalışmada Kariyer Hedefi Geribildirim Ölçeğinin (KHGÖ) Türkçeye uyarlanması amaçlanmıştır. Araştırma, iki farklı üniversite ve beş farklı lisede öğrenim gören toplam 1.068 öğrenci üzerinde yapılmıştır. Ölçeğin yapı geçerliğini test etmek için yapılan doğrulayıcı faktör analizi sonucunda, Türkçeye uyarlanan ölçeğin altı boyutlu ve 24 maddeden oluşan özgün formunun doğrulandığı görülmüştür. Ölçeğin Cronbach Alpha iç tutarlık katsayısı üniversite öğrencilerine ait veri grubunda .88, lise öğrencilerine ait veri grubunda .85 olarak bulunmuştur. Ölçeğin test-tekrar test korelasyon katsayısı üniversite öğrencilerine ait veri grubunda .77, lise öğrencilerine ait veri grubunda ise .73 olarak hesaplanmıştır. KHGÖ’nün uygulanan İngilizce ve Türkçe formları arasındaki korelasyonun pozitif ve yüksek düzeyde ilişkili olduğu görülmüştür. Ölçeğin madde-toplam korelasyonları üniversite öğrencilerinde .36 ile .62, lise öğrencilerinde ise .31 ile .56 arasında değiştiği bulunmuştur. Ölçeğin uyum geçerliği için yapılan analizlerde KHGÖ’nün Kariyer Stresi Ölçeği ile pozitif ve yüksek düzeyde, Genel Öz-Yeterlik Ölçeği ile negatif ve orta düzeyde ilişkilere sahip olduğu belirlenmiştir. Araştırma bulguları, KHGÖ’nün altı faktörlü orijinal yapısının doğrulandığına ve kariyer hedeflerine ilişkin geribildirimleri değerlendirmede geçerli ve güvenilir bir ölçüm aracı olarak kullanılabileceğine ilişkin önemli kanıtlar sağlamaktadır.In this study, it was aimed to adapt the Career Goal Feedback Scale (CGFS) to Turkish. The research was conducted on 1.068 students from two different universities and five different high schools. As a result of confirmatory factor analysis conducted to test the validity of the structure of the scale, it was seen that the original form consisting of six dimensions and 24 items which was adapted to the Turkish was confirmed. The Cronbach Alpha internal consistency coefficient of the scale was found to be .88 in the data group of the university students and .85 in the data group of the high school students. Test-retest correlation coefficient of the scale was calculated as .77 in the data group of university students and .73 in the data group high school students. Correlations between the English and Turkish forms of the CGFS were found to be positively and highly correlated. The item-total correlations of the scale were found to vary between .36 and .62 for university students and between .31 and .56 for high school students. In the analyzes made for the concurrent validity of the scale, it was determined that the CGFS had a positive and high correlation with the Career Stress Scale and negative and medium correlation with the General Self-Efficacy Scale. The research findings provide important evidence that the six-factor original structure of the CGFS is validated and can be used as a valid and reliable measurement tool for assessing feedback on career goals

Modelling the Potential Impacts of Nuclear Energy and Renewables in the Turkish Energy System

With heightening global concerns about the impacts of climate change, the debate around different carbon mitigation options is gaining momentum. A widespread argument is between those for and against utilizing nuclear energy as a low-carbon energy source. This debate is also relevant for Turkey, a country that is set to introduce nuclear energy to its electricity generation mix over the coming years. The purpose of the study is to assess the potential merits and drawbacks of the utilization of nuclear energy in the country versus the increased utilization of renewable energy sources. A fundamental merit order model is used for modeling the Turkish electricity market until 2025 under three scenarios. The comparative effects of renewable energy sources and nuclear energy are evaluated in terms of their impact on electricity generation costs, CO2 emissions and energy security. The results of the study show that the increased utilization of renewable energy has a more effective role in achieving the country’s energy targets in comparison to nuclear energy

Will hope and career adapt-abilities bring students closer to their career goals? An investigation through the career construction model of adaptation

WOS:000769876300003Due to the globalization of the economy and rapid changes in technology, the need to focus on concepts that can have a significant impact on individuals' adaptation to uncertain and rapidly changing environments has emerged. To better understand the effect of personal resources on career, the study attempted to examine the relationship between hope, career adapt-abilities and career goal feedback within the framework of career construction model of adaptation. Participants of the study were 308 high school students (225 female, 83 male). Structural equation modeling was used within the scope of the study. The findings revealed that hope positively predicted career adapt-abilities. Hope and career adapt-abilities negatively predicted career goal feedback. In addition, career adapt-abilities mediated the relationship between hope and career goal feedbacks. The results of the research model supported the career construction model of adaptation. Findings showed that hope was the source of motivation for the individual to reach their goals, and career adapt-abilities offered strategies and progress to reach career goals by using the individual's motivation. The findings were discussed in the context of the relevant literature and suggestions were made for the literature

The Lone Wolf Scale: A validity and reliability study of the measurement of acting and working lone

Yirmi birinci yüzyılda, bireyin tek başına hareket etme ve çalışma davranışlarını azaltması mutlu ve başarılı bir kariyer sürdürmesinde önemlidir. Bu çalışmanın amacı; bireylerin tek başına hareket etmesi ve çalışmasını ortaya koyan ve Barr, Dixon ve Gassenheimer (2005) tarafından geliştirilen Yalnız Kurt Ölçeği’nin Türk kültürü için geçerlik ve güvenirliğini incelemektir. Araştırma 360 üniversite öğrencisiyle gerçekleştirilmiştir. Çalışmaya 212 kadın, 148 erkek öğrenci katılmıştır. Ölçeğin geçerliğini değerlendirmek için yapı geçerliği, madde ayırt ediciliği ve uyum geçerliği incelenmiştir. Yapı geçerliği için yapılan analiz sonucunda ölçeğin tek faktörlü ve yedi maddeden oluşan orijinal yapısını doğruladığı görülmüştür. Madde ayırt ediciliğini incelemek için hesaplanan madde- toplam korelasyonlarının kabul edilebilir düzeyde olduğu görülmüştür. Uyum geçerliği kapsamında Kariyer Uyum Yetenekleri Ölçeği-Yeni Form toplam ve alt boyutları ile Yalnız Kurt Ölçeği toplam puanı arasında negatif ve anlamlı ilişkiler olduğu elde edilmiştir. Güvenirlik için hesaplanan Cronbach alfa iç tutarlık katsayısı ile test-tekrar test korelasyon değerinin kabul edilebilir düzeylerde olduğu görülmüştür. Ölçeğin kadın ve erkek gruplar üzerinde ölçüm değişmezliği incelenmiş ve tek faktörlü yapının her iki grupta da aynı olduğuna ulaşılmıştır. Elde edilen bulgular Yalnız Kurt Ölçeğinin geçerli ve güvenilir bir ölçme aracı olarak kullanılabileceğini göstermektedir.Yirmi birinci yüzyılda, bireyin tek başına hareket etme ve çalışma davranışlarını azaltması mutlu ve başarılı bir kariyer sürdürmesinde önemlidir. Bu çalışmanın amacı; bireylerin tek başına hareket etmesi ve çalışmasını ortaya koyan ve Barr, Dixon ve Gassenheimer (2005) tarafından geliştirilen Yalnız Kurt Ölçeği’nin Türk kültürü için geçerlik ve güvenirliğini incelemektir. Araştırma 360 üniversite öğrencisiyle gerçekleştirilmiştir. Çalışmaya 212 kadın, 148 erkek öğrenci katılmıştır. Ölçeğin geçerliğini değerlendirmek için yapı geçerliği, madde ayırt ediciliği ve uyum geçerliği incelenmiştir. Yapı geçerliği için yapılan analiz sonucunda ölçeğin tek faktörlü ve yedi maddeden oluşan orijinal yapısını doğruladığı görülmüştür. Madde ayırt ediciliğini incelemek için hesaplanan maddetoplam korelasyonlarının kabul edilebilir düzeyde olduğu görülmüştür. Uyum geçerliği kapsamında Kariyer Uyum Yetenekleri Ölçeği-Yeni Form toplam ve alt boyutları ile Yalnız Kurt Ölçeği toplam puanı arasında negatif ve anlamlı ilişkiler olduğu elde edilmiştir. Güvenirlik için hesaplanan Cronbach alfa iç tutarlık katsayısı ile test-tekrar test korelasyon değerinin kabul edilebilir düzeylerde olduğu görülmüştür. Ölçeğin kadın ve erkek gruplar üzerinde ölçüm değişmezliği incelenmiş ve tek faktörlü yapının her iki grupta da aynı olduğuna ulaşılmıştır. Elde edilen bulgular Yalnız Kurt Ölçeğinin geçerli ve güvenilir bir ölçme aracı olarak kullanılabileceğini göstermektedir

Esnek eklemli paralel manipülatörlerin ters dinamik kontrolü.

The purpose of this thesis is to develop a position control method for parallel manipulators so that the end effector can follow a desired trajectory specified in the task space where joint flexibility that occurs at the actuated joints is also taken into consideration. At the beginning of the study, a flexible joint is modeled, and the equations of motion of the parallel manipulators are derived for both actuator variables and joint variables by using the Lagrange formulation under three assumptions regarding dynamic coupling between the links and the actuators. These equations of motion are transformed to an input/output relation between the actuator torques and the actuated joint variables to achieve the trajectory tracking control. Moreover, the singular configurations of the parallel manipulators are explained. As a case study, a three degree of freedom, two legged planar parallel manipulator is simulated considering joint flexibility. The structural damping of the active joints, viscous friction at the passive joints and the rotor damping are also considered throughout the study. Matlab® and Simulink® softwares are used for the simulations. The results of the simulations reveal that steady state errors are negligibly small and good tracking performances can be achieved.M.S. - Master of Scienc

Otonom sualtı aracı manipülatör sistemlerinin modellenmesi ve kontrolü.

In this thesis, dynamic modeling and nonlinear control of autonomous underwater vehicle manipulator systems are presented. Mainly, two types of systems consisting of a 6-DOF AUV equipped with a 6-DOF manipulator subsystem (UVMS) and with an 8-DOF redundant manipulator subsystem (UVRMS) are modeled considering hydrostatic forces and hydrodynamic effects such as added mass, lift, drag and side forces. The shadowing effects of the bodies on each other are introduced when computing the hydrodynamic forces. The system equations of motion are derived recursively using Newton–Euler formulation. The inverse dynamics control algorithms are formulated and trajectory tracking control of the systems is achieved by assigning separate tasks for the end effector of the manipulator and for the underwater vehicle. The proposed inverse dynamics controller utilizes the full nonlinear model of the system and consists of a linearizing control law that uses the feedback of positions and velocities of the joints and the underwater vehicle in order to cancel off the nonlinearities of the system. The PD control is applied after this complicated feedback linearization process yielding second order error dynamics. The thruster dynamics is also incorporated into the control system design. The stability analysis is performed in the presence of parametric uncertainty and disturbing ocean current. The effectiveness of the control methods are demonstrated by simulations for typical underwater missions.Ph.D. - Doctoral Progra

Veri madenciliği ile banka ürünlerinin doğrudan pazarlamasının kar/maliyet tahlili.

Nowadays, direct marketing is widely used advertisement method by many business areas such as banks. The main purposes of direct marketing are to maximize return on investment, minimize cost of promotions and reach to peak number of customers that prefer the offerred campaign. Therefore, it is necessary to collect and process huge amount of customer related data to decide questions of which customer will be offered a product, which product will be suitable to him/her and via which channel the promotion will be presented. However, because positive customer response rates are much less than negative ones, negative data instances dominate positive ones and cause imbalance in dataset. This problem makes it difficult to make a successful selection of product and channel for a promotion and therefore, brings about decrease on true predictions and total profit value while false predictions and total cost value increase. In this thesis, methods are proposed which improve profit/cost ratio to increase return on investment while increasing accuracy rate. Experiments with proposed methods applied on a real bank dataset show very promising profit/cost ratios and accuracy rates on predicting customers with proper products and channels. Results of experiments indicate that proposed methods yield some amount of decrease on total profit value; however, since the decrease rate of total cost value is much greater than total profit one, profit/cost ratio increases. M.S. - Master of Scienc

Küçük hidroelektrik enerji konusunda bir vaka analizi.

Feasibility studies concerning decision-making for various types of items to be used in a small hydropower scheme is important for estimating the energy generation, the approximate cost of the project, and the required budget allocation. A computer program named RETScreen, which is commonly used in the North Americas, is capable of evaluating the energy generation, investment and maintenance costs for small hydro-projects. This thesis is based on application of this program to the Turkish practice. To this end, energy and cost equations dealing with energy generation and cost estimation of various items, such as costs of turbines, generators, installation of energy equipment, transmission line, etc., will be applied according to the common practice currently used in Turkey. A case study is performed to illustrate the use of this program. With the use of this program, it may be possible to perform quick successive runs to assess economic feasibility of several alternatives.M.S. - Master of Scienc