Ortak Dersler Bölümü

Permanent URI for this communityhttps://hdl.handle.net/20.500.12416/1817

Browse

Now showing 1 - 20 of 130

21. yy becerilerinin kazandırılmasında yaratıcı yazmanın önemi.
(Pegem Akademi, 2018) Akkoyunlu, Buket; 8539; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
A New Estimation Technique for AR(1) Model with Long-Tailed Symmetric Innovations
(2017) Dener Akkaya, Ayşen; Türker Bayrak, Özlem; 56416; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
In recent years, it is seen in many time series applications that innovations are non-normal. In this situation, it is known that the least squares (LS) estimators are neither efficient nor robust and maximum likelihood (ML) estimators can only be obtained numerically which might be problematic. The estimation problem is considered newly through different distributions by the use of modified maximum likelihood (MML) estimation technique which assumes the shape parameter to be known. This becomes a drawback in machine data processing where the underlying distribution cannot be determined but assumed to be a member of a broad class of distributions. Therefore, in this study, the shape parameter is assumed to be unknown and the MML technique is combined with Huber’s estimation procedure to estimate the model parameters of autoregressive (AR) models of order 1, named as adaptive modified maximum likelihood (AMML) estimation. After the derivation of the AMML estimators, their efficiency and robustness properties are discussed through simulation study and compared with both MML and LS estimators. Besides, two test statistics for significance of the model are suggested. Both criterion and efficiency robustness properties of the test statistics are discussed, and comparisons with the corresponding MML and LS test statistics are given. Finally, the estimation procedure is generalized to AR(q) models.
A New Estimation Technique for AR(1) Model with Long-Tailed Symmetric Innovations
(Springer, 2018) Dener Akkaya, Ayşen; Türker Bayrak, Özlem; 56416; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
In recent years, it is seen in many time series applications that innovations are non-normal. In this situation, it is known that the least squares (LS) estimators are neither efficient nor robust and maximum likelihood (ML) estimators can only be obtained numerically which might be problematic. The estimation problem is considered newly through different distributions by the use of modified maximum likelihood (MML) estimation technique which assumes the shape parameter to be known. This becomes a drawback in machine data processing where the underlying distribution cannot be determined but assumed to be a member of a broad class of distributions. Therefore, in this study, the shape parameter is assumed to be unknown and the MML technique is combined with Huber’s estimation procedure to estimate the model parameters of autoregressive (AR) models of order 1, named as adaptive modified maximum likelihood (AMML) estimation. After the derivation of the AMML estimators, their efficiency and robustness properties are discussed through simulation study and compared with both MML and LS estimators. Besides, two test statistics for significance of the model are suggested. Both criterion and efficiency robustness properties of the test statistics are discussed, and comparisons with the corresponding MML and LS test statistics are given. Finally, the estimation procedure is generalized to AR(q) models.
A sign of the past: Aliye berger
(2015) Okur Tolun, Elif; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
Aliye Berger , who has a privileged place in The Turkish Painting Art , stayed away from the generation clash of her time and various groupings. She was an artist who had an aim to acquire a place in art community. Her privileged place in art , and her life without giving attention to social pressure has result as reflecting her own her life style to her works. She is one of the artists who acts as herself. Her artistic style is just like an action which has a fictional expression upon her own identity. Creation is not producing extraordinary things, creating shapes and strolling around the current time. Art has no gender, nationality and race. What is important is the necessity to do something real by feeling those deeply. People whom we can call genuine artists can easily assimilate polyphony in life and with some sensibility they can spend a whole life to reflect these with some bravery. Just as Aliye Berger, her art is also fed by her life. Her actions become a part of her life and create their own symbols. Thus, her works turn into their genuine feature. In this paper, it is aimed to understand the identity of Aliye Berger through her gravures. As a woman artist who has gone beyond her own age with an analysis through her art, it is aimed to investigate her artistic personality and extraordinary sensitivity. This study is neither a history of art nor a biography of literary agent; it is an approach with the artist’s eye Berger’s drawings. Trying to understand her through the fancy world she created, insight of beauty, a place of fiction, technical restructuring and critiques related to her art and the visual materials and by investigating her works we wanted to create a written portrait of Aliye Berger. Keywords: Aliye Berger, print making, identity, gravure, image.
Citation - WoS: 2
Academic Mobbing in Turkey and Suggestions for Solutions: Content Analysis of Graduate Theses
(Tuba-turkish Acad Sciences, 2019) Erdemir, Burcu; 192351; 01. Çankaya Üniversitesi
The effects of globalization on various sectors around the world are reflected in academia through competition, diminishing job security and faculty collegiality, and changing managerial understanding which causes academics to feel pressured to maintain the balance between teaching and research. This transformation inevitably has made the concepts explained by Foucault as "the power exerciser" and "the subject of power" more apparent, as demonstrated by conflicts and mobbing cases. The aim of this study is to review all the master's theses and doctoral dissertations written in Turkey to pin down what has been done until now on mobbing and to form a reference point. Upon searching for certain key words on the website of Council of Higher Education Thesis Center in June 2017, 655 theses on mobbing in various sectors with diverse participant groups were detected. After examining these theses in terms of their participants, it was found out that 29 of them, written between 2005 and 2017, addressed the issue of mobbing among academics. Of these, 26 theses, written between 2006 and 2016, were included in the study. The findings of these theses indicate that while there is 4-100% mobbing in the state and the foundation universities, younger people, singles, and women are more vulnerable to mobbing regarding self-expression, social relations, and communication, and they prefer to remain silent in the face of this issue. Besides, there is a negative relationship between mobbing and seniority, title, organisational justice, trust, commitment, and job-satisfaction. The primary causes of mobbing in academia are nepotism, poor leadership, unhealthy organisational culture, solidarity, andlack of communication. This study is expected to contribute to the formation of a conceptual framework about academic mobbing for the future studies and to expediting the process of taking measures for the eradication of the problem.
Adaptation of the Student Expectations of Online Learning Survey Revised (seols-R) Into Turkish
(Karadeniz Technical University, 2020) Dağhan, G.; Akkoyunlu, B.; Arslan, Ö.; 8539; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
The aim of this study is to adapt the Student Expectations of Online Learning Survey Revised [SEOLS-R] developed by Harris, Larrier and Castano-Bishop (2011) into Turkish. For this purpose, the adaptation process of the scale, which consists of 7 factors and 43 items in the 5-point Likert structure, started first with the necessary permissions, and then a translation and cultural adaptation process was carried out. After the cultural adaptation process, the construct validity of the scale was tested with 411 students who study in distance education programs of Amasya University. After the construct validity findings, the reliability values of the scale were examined. In line with the findings, it was concluded that the Turkish version of the SEOLS-R scale is a valid and reliable measurement tool suitable for Turkish culture. © 2020 Karadeniz Technical University. All rights reserved.
Adaptive Estimation of Autoregressive Models Under Long-Tailed Symmetric Distribution
(Association for Computing Machinery, 2019) Yentür, B.; Bayrak, Ö.T.; Akkaya, A.D.; 56416; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
In this paper, we consider the autoregressive models where the error term is non-normal; specifically belongs to a long-tailed symmetric distribution family since it is more relevant in practice than the normal distribution. It is known that least squares (LS) estimators are neither efficient nor robust under non-normality and maximum likelihood (ML) estimators cannot be obtained explicitly and require a numerical solution which might be problematic. In recent years, modified maximum likelihood (MML) estimation is developed to overcome these difficulties. However, this method requires that the shape parameter is known which is not realistic in machine data processing. Therefore, we use adaptive modified maximum likelihood (AMML) technique which combines MML with Huber’s estimation procedure so that the shape parameter is also estimated. After derivation of the AMML estimators, their efficiency and robustness properties are discussed through a simulation study and compared with MML and LS estimators. © 2019 Association for Computing Machinery.
Analysis and Mathematical Computation of Some Dynamic Function for Strontium Stannate
(Taylor & Francis Ltd, 2021) Askun, Ali Riza; 56475; 01. Çankaya Üniversitesi; 09. Rektörlük; 09.01. Ortak Dersler Bölümü
The frequency and full width at half maximum (FWHM) data of the A(g) Raman modes (95.4, 231.4 and 263.2 cm(-1)) in strontium stannate crystal have been analyzed using the Balkanski model and the fitting parameters were determined. Also, the isobaric Gruneisen parameter of A(g) Raman modes studied here was computed below the room temperature. This computation was performed from the unit cell volume and the observed frequency data of this crystal. Finally, values of the activation energy were extracted close to the structural phase transition temperatures of 160 and 265 K using the observed FWHM data of strontium stannate.
Analysis and Mathematical Computation of Some Dynamic Functions for the Guanidine Zinc Sulfate
(Taylor & Francis Ltd, 2021) Askun, A. R.; Kiraci, A.; 56475; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
A power-law formula with a critical exponent alpha was used to analyze the anomalous behavior of the specific heat for guanidine zinc sulfate (GZS) crystal close to the phase transition temperature of T-c = 178.4 K. The obtained values of 0.13 and 0.14 for alpha below (T < T-c) and above (T> T-c) the phase transition temperature, respectively, were almost the same value of 0.13 (1/8) that predicted from the 3-D (sing model. Also, the internal energy U, the entropy S and the free energy G of this crystal were calculated as a function of temperature dose to the phase transition temperature of T-c = 178.4 K.
Citation - WoS: 2
Citation - Scopus: 3
Analysis of the Integrated Intensity of the Central Peaks Calculated as a Function of Temperature in the Ferroelectric Phase of Lithium Tantalate
(Vinca inst Nuclear Sci, 2018) Yurtseven, Hamit; Kiraci, Ali; 42475; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
The integrated intensity of the central peak is calculated as a function of temperature in the ferroelectric phase (T < T-C) of nearly stoichiometric LiTaO3. This calculation is performed using the temperature dependence of the order parameter obtained from the mean field theory at temperatures lower than the transition temperature T-C (T-C = 963 K) of this crystal. The calculated values of the order parameter (squared) are fitted to the integrated intensity of the central peaks as observed from the Raman and Brillouin scattering experiments as reported in the literature in the ferroelectric phase of nearly stoichiometric LiTaO3. Our results are in good agreement with the observed behavior of LiTaO3 crystal. Because of the applications of LiTaO3 in several academic disciplines including the material science and thermal science, it is beneficial to investigate dynamic properties of this crystal such as the damping constant, inverse relaxation time and the activation energy as also we studied here.
Analysis of the Specific Heat and the Free Energy and Calculation of the Entropy and the Internal Energy of [N(ch3)4]2mnbr4 Close To the Phase Transition
(Taylor & Francis Ltd, 2021) Kiraci, A.; 42475; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
The critical behavior of the specific heat and the Gibbs free energy of [N(CH3)(4)](2)MnBr4 was analyzed using the 'sing model close to the phase transition temperature of T-c = 276.5 K. Obtained value of alpha=0.02 from the Gibbs free energy and from the specific heat approximately 2.0 K and 1.4 K, respectively, below Tc (ferroelastic phase) and also deduced value of alpha= 0.04 from the specific heat approximately 0.3 K above T-c (paraelastic phase) can be compared with that predicted from mean field theory (alpha = 0). Also, the entropy and the internal energy of this crystal were predicted.
Analysis of the Specific Heat and the Free Energy of [N(Ch 3 ) 4 ] 2 Znbr 4 Close to the Ferro-Paraelastic Phase Transition
(Taylor&Francis LTD, 2019) Kiracı, Ali; 42475; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
A power-law formula deduced from the Ising model was used to analyze the temperature dependence of the specific heat C p and the Gibbs free energy G of [N(CH 3 ) 4 ] 2 ZnBr 4 compound in the vicinity of the phase transition temperature of T C = 287.2 K. Obtained values of the critical exponents α from the Gibbs free energy were consistent with that predicted from 2-d potts model (α = 0.3), while obtained values of α from the specific heat in both ferroelastic and paraelastic phases were consistent with that predicted from the mean field theory (α = 0) in the vicinity of the phase transition temperature. This is an indication of that [N(CH 3 ) 4 ] 2 ZnBr 4 compound undergoes a second order type phase transition. Also, the enthalpy (H) and the entropy (S) of this crystal were calculated in terms of the extracted values of the critical exponent in both ferroelastic and paraelastic phases.
Analysis of the specific heat and the free energy of [N(CH3)(4)](2)ZnBr4 close to the ferro-paraelastic phase transition
(Taylor&Francis LTD, 2019) Kiracı, Ali; 42475; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
A power-law formula deduced from the Ising model was used to analyze the temperature dependence of the specific heat and the Gibbs free energy of [N(CH3)(4)](2)ZnBr4 compound in the vicinity of the phase transition temperature of T-C = 287.2 K. Obtained values of the critical exponents from the Gibbs free energy were consistent with that predicted from 2-d potts model ( = 0.3), while obtained values of from the specific heat in both ferroelastic and paraelastic phases were consistent with that predicted from the mean field theory ( = 0) in the vicinity of the phase transition temperature. This is an indication of that [N(CH3)(4)](2)ZnBr4 compound undergoes a second order type phase transition. Also, the enthalpy () and the entropy () of this crystal were calculated in terms of the extracted values of the critical exponent in both ferroelastic and paraelastic phases.
Citation - WoS: 8
Citation - Scopus: 8
Analysis of the Specific Heat and the Free Energy of [N(ch3)4]2znbr4 Close To the Ferro-Paraelastic Phase Transition
(Taylor & Francis Ltd, 2019) Kiraci, A.; 42475; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
A power-law formula deduced from the Ising model was used to analyze the temperature dependence of the specific heat and the Gibbs free energy of [N(CH3)(4)](2)ZnBr4 compound in the vicinity of the phase transition temperature of T-C = 287.2 K. Obtained values of the critical exponents from the Gibbs free energy were consistent with that predicted from 2-d potts model ( = 0.3), while obtained values of from the specific heat in both ferroelastic and paraelastic phases were consistent with that predicted from the mean field theory ( = 0) in the vicinity of the phase transition temperature. This is an indication of that [N(CH3)(4)](2)ZnBr4 compound undergoes a second order type phase transition. Also, the enthalpy () and the entropy () of this crystal were calculated in terms of the extracted values of the critical exponent in both ferroelastic and paraelastic phases.
Assessment of the Use of AutoCAD in Mechanical Engineering Technical Drawing Education
(2017) Akyürek, Turgut; 06.06. Makine Mühendisliği; 06. Mühendislik Fakültesi; 01. Çankaya Üniversitesi
: AutoCAD is one of the widely used software tools in engineering education. In this study, a general assessment of AutoCAD for the usage in the mechanical engineering technical drawing education is made. AutoCAD is assessed in terms of the fulfilment of the requirements defined for the main two technical drawing courses. AutoCAD is assessed in terms of its capability in meeting the requirements of the technical drawing courses
Bibliyografik Künye Karekodu Oluşturma Etkinliğine Yönelik Öğrenci, Öğretmen ve Okul Kütüphanecisi Görüşleri
(2019) Çetin, Nihal Menzi; Akkoyunlu, Buket; 8539; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
Bilgi ve iletişim teknolojileri bilgiye erişme, bilgiyi paylaşma, iletme, bilgi ile iletişim kurma,yazma ve sunum yapma gibi işlemleri yerine getiren çeşitli araçlar sunmaktadır. Karekodlarmobil araçlarda kullanılan ve bilgiye erişimi hızlandıran araçlardan biridir. İlgi çekici vekullanımı kolay bir araç olarak karekodlardan eğitim ortamında faydalanılmakta ve olumlusonuçlar elde edilmektedir. Çeşitli araçları kullanarak bilgi becerilerini kazandırmayıamaçlayan ‘bilimsel iletişim öğretim programı’ ortaokul altıncı sınıf öğrencilerine yönelikgeliştirilmiş ve uygulanmıştır. Bu çalışmada bilimsel iletişim öğretim programında yer alanetkinliklerden biri olan bibliyografik künye karekodu oluşturma etkinliğine katılanöğrencilerin, öğretmenlerin ve okul kütüphanecisinin etkinliğe yönelik görüşleriincelenmiştir. Çalışma sonucunda söz konusu etkinliğin öğrencilerin bilgi kaynaklarına vekütüphaneye yönelik bakış açılarını olumlu etkilediği ve öğrencilerin kütüphane ortamındakarekodlardan yararlanabilecekleri faydalı bir etkinlik olduğu ifade edilmiştir.
Bilim Haritalama Yöntemi ve Eğitim Teknolojisi Alanında Yürütülen Eğilim Araştırmalarına Katkıları
(Pegem, 2019) Bardakçı, Salih; Yılmaz Soylu, Meryem; Deryakulu, Deniz; Akkoyunlu, Buket; 8539; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
Bilimsel iletişim becerilerini değerlendirmeye yönelik bir rubrik geliştirme çalışması
(2018) Menzi Çetin, Nihal; Akkoyunlu, Buket; 8539; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
Bilişötesi Düşünme
(2020) Yılmaz Soylu, Meryem; Akkoyunlu, Buket; 8539; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
İnsanların günlük yaşamlarında bellek kullanımı, bilimsel düşünme, sosyal etkileşim gibi süreçlerin temelinde bireyin kendi ve diğerlerinin düşüncelerinin farkında olmayı gerektiren bilişötesi süreçler yer almaktadır. Bu bölüm; bilişötesi düşünme süreçlerinin gelişimi, farklı yaklaşımlar ve kuramlar açısından bilişötesinin tanımları ve boyutlarının açıklanması ile başlamaktadır. Alanyazında yapılan birçok araştırma bilişötesi bilgi ile bilişötesi becerinin harmanlanarak kullanıldığı ortamların başarılı öğrenme çıktılarını öngördüğünü göstermektedir. Bu doğrultuda bu bölümün ilerleyen kısımlarında bilişötesinin öğrenme süreçleri ile ilişkisi ele alınmaktadır. Bilişötesinin öğrenenlere kazandırılmasına rehberlik eden ilkeler ve bu ilkeler ile bilişötesinin doğası çerçevesinde teknolojinin bilişötesi öğretiminde oynayacağı rol de bu bölüm çerçevesinde tartışılmaktadır.
Citation - WoS: 1
Citation - Scopus: 1
Calculation of the Frequency Shifts and Damping Constant for the Raman Modes (A1g, B1) Near the Tetragonal-Cubic Transition in Srtio3
(Tubitak Scientific & Technological Research Council Turkey, 2017) Yurtseven, Hasan Hamit; Kiraci, Ali; 42475; 09.01. Ortak Dersler Bölümü; 09. Rektörlük; 01. Çankaya Üniversitesi
Raman shifts of the soft mode A(1g) and the B-1 mode are calculated at various pressures at room temperature for the cubic-tetragonal transition (P-c = 9.5 GPa) in SrTiO3. This calculation is performed using the observed volume data through the mode Gruneisen parameters of A(1g) and B-1 which vary with pressure, by fitting to the experimental wavenumbers in this crystalline system. Calculated Raman shifts are then used as order parameters to predict the pressure dependence of the damping constant and the inverse relaxation time for the cubic-tetragonal transition in SrTiO3. Our predictions from the pseudospin-phonon coupling and the energy fluctuation models can be compared with the experimental measurements when available in the literature.

Browse

Browsing Ortak Dersler Bölümü by Title