Aydın Karakoca - Academia.edu (original) (raw)
Papers by Aydın Karakoca
Necmettin Erbakan Üniversitesi Fen ve Mühendislik Bilimleri dergisi, Apr 30, 2024
Journal of Applied Statistics, Jan 8, 2015
Journal of Mathematics, May 18, 2022
In this research, it is aimed to develop a scale for the use of cloud technologies in education. ... more In this research, it is aimed to develop a scale for the use of cloud technologies in education. The sample group of the study consists of 415 preservice teachers who are studying at universities in Konya. For the validity and reliability analyses of the scale, the sample group consisting of 415 units was randomly allocated ( =208 and =207) sub-samples, the first sample was used for explanatory factor analysis and the second sample was used for confirmatory factor analysis. As a result of the explanatory factor analysis of the data obtained from the first group, 6-item scale consists of motivation and interaction sub-dimensions. Interaction dimension of total variability alone explains 35.89% and motivation dimension explains 33.56%. Factor loads for the sub-dimensions ranged between 0.74 and 0.83. The internal consistency coefficient was 0.83 for Cronbach alpha, 0.77 for motivation subscale and 0.79 for interaction subscale. For the second sample, it was found that the model formed...
Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi, Jun 1, 2005
Journal of Mathematics, May 18, 2022
Bu çalışma Bahri Dağdaş Uluslararası Tarımsal Araştırma Enstitüsü Deneme alanlarında yürütülmüştü... more Bu çalışma Bahri Dağdaş Uluslararası Tarımsal Araştırma Enstitüsü Deneme alanlarında yürütülmüştür. Çalışmada Dağdaş-94 buğday çeşiti kullanılmıştır. Bitkilerde lO'ar gün aralıklarla düzenli olarak 15 kez boy ölçümleri yapılmıştır. Her parselden 5 bitki tesadüfen alınmış ve üç tekrarlamalı olarak yapılan ölçümlerde, her ölçüm için toplam J 5 bitki kullanılmıştır. Buğday bitkisinin boyunun zamana göre modellenınesi ve model parametrelerinin tahmini uygulaına yönünden önem arzetmektedir. Bu amaçla, doğrusal olmayan bir model gösteren bitkinin boy uzunluğu ile zaman ilişkisi, belli noktalarda zıplamalar gösterirken bazı noktalarda kesilmeler gösterebilmektedir. Bu çalışmamızda buğday bitkisinin boy uzunluğu ve zaman ilişkisi açısından parçalı regresyon modelinin parametre tahmini ve zıplama noktalarının tahmin edilmesi ele alınmıştır
Academic platform-Journal of engineering and science, May 25, 2019
Bu calismada Weibull dagilimina sahip ilerleyen tur tip 2 sansurlu orneklemlerde parametre tahmin... more Bu calismada Weibull dagilimina sahip ilerleyen tur tip 2 sansurlu orneklemlerde parametre tahmini probleminde Newton yontemine alternatif bir cozum onerilmistir. Newton yontemi en cok olabilirlik tahmininde siklikla kullanilmaktadir. Newton yontemi populer olmasina ragmen en buyuk dezavantaji en az iki kez turevlenebilir fonksiyonlar icin kullanilabilmesidir. Olabilirlik fonksiyonu sansurlu orneklemlerde tam orneklemlere gore fonksiyonel olarak daha kompleks bir yapida oldugundan, turev ve diger hesaplamalar nispeten daha karisiktir. Bu calismada en cok olabilirlik yonteminde elde edilen denklem sisteminin cozumu icin Newton metodunun kullanimindaki kisitlamalara bir alternatif olarak Genetik Algoritma onerilmistir. Detayli bir simulasyon calismasi yardimiyla yan ve hata kareler ortalamasi ile iki yontemin performanslari degerlendirilmistir. Simulasyon sonuclarina gore onerilen yontemin karsilastirilan tum durumlar icin olcek parametresi icin daha iyi sonuclar verdigi, sekil parame...
Background/Aim: Colonoscopy may be associated with pain due to distension of colonic mesentery an... more Background/Aim: Colonoscopy may be associated with pain due to distension of colonic mesentery and air insufflation into the colonic lumen, although Sedo-analgesia may increase the tolerability of the procedure. This randomized, prospective, controlled study based on our clinical observations aimed to explore the sustainability of comfort provided by intraoperative sedation by allowing gas discharge via anoscopy while patients were still sedated. Methods: The patients that underwent colonoscopy for colorectal cancer screening were considered for this study and a total of 100 patients were (61 male and 39 female) were included in this study. Colonoscopy procedures were carried out by two experienced endoscopists who are adequately trained. Following the colonoscopy, 50 patients in the study group were administered a disposable anoscope with sterile, water-soluble, lubricant gel while the effect of sedation was still maintained. Endoscopist compressed four abdominal quadrants for 5 se...
Cumhuriyet Science Journal
Sakarya Universitesi Fen Bilimleri Enstitusu Dergisi, 2004
Journal of Selcuk University Natural and Applied Science, Apr 2, 2013
Http Dx Doi Org 10 1080 02664763 2014 1000275, Jan 8, 2015
ABSTRACT Bimodal mixture Weibull distribution being a special case of mixture Weibull distributio... more ABSTRACT Bimodal mixture Weibull distribution being a special case of mixture Weibull distribution has been used recently as a suitable model for heterogeneous data sets in many practical applications. The bimodal mixture Weibull term represents a mixture of two Weibull distributions. Although many estimation methods have been proposed for the bimodal mixture Weibull distribution, there is not a comprehensive comparison. This paper presents a detailed comparison of five kinds of numerical methods, such as maximum likelihood estimation, least-squares method, method of moments, method of logarithmic moments and percentile method (PM) in terms of several criteria by simulation study. Also parameter estimation methods are applied to real data.
We introduce structural change tests on linear regression models. Properties of structural tests ... more We introduce structural change tests on linear regression models. Properties of structural tests are decribed and an application of tests done on a data sets on deposit interest rate for Latvia, Holland and Turkey which gets from unistat and Tuik.
Journal of Applied Statistics, 2015
Necmettin Erbakan Üniversitesi Fen ve Mühendislik Bilimleri dergisi, Apr 30, 2024
Journal of Applied Statistics, Jan 8, 2015
Journal of Mathematics, May 18, 2022
In this research, it is aimed to develop a scale for the use of cloud technologies in education. ... more In this research, it is aimed to develop a scale for the use of cloud technologies in education. The sample group of the study consists of 415 preservice teachers who are studying at universities in Konya. For the validity and reliability analyses of the scale, the sample group consisting of 415 units was randomly allocated ( =208 and =207) sub-samples, the first sample was used for explanatory factor analysis and the second sample was used for confirmatory factor analysis. As a result of the explanatory factor analysis of the data obtained from the first group, 6-item scale consists of motivation and interaction sub-dimensions. Interaction dimension of total variability alone explains 35.89% and motivation dimension explains 33.56%. Factor loads for the sub-dimensions ranged between 0.74 and 0.83. The internal consistency coefficient was 0.83 for Cronbach alpha, 0.77 for motivation subscale and 0.79 for interaction subscale. For the second sample, it was found that the model formed...
Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi, Jun 1, 2005
Journal of Mathematics, May 18, 2022
Bu çalışma Bahri Dağdaş Uluslararası Tarımsal Araştırma Enstitüsü Deneme alanlarında yürütülmüştü... more Bu çalışma Bahri Dağdaş Uluslararası Tarımsal Araştırma Enstitüsü Deneme alanlarında yürütülmüştür. Çalışmada Dağdaş-94 buğday çeşiti kullanılmıştır. Bitkilerde lO'ar gün aralıklarla düzenli olarak 15 kez boy ölçümleri yapılmıştır. Her parselden 5 bitki tesadüfen alınmış ve üç tekrarlamalı olarak yapılan ölçümlerde, her ölçüm için toplam J 5 bitki kullanılmıştır. Buğday bitkisinin boyunun zamana göre modellenınesi ve model parametrelerinin tahmini uygulaına yönünden önem arzetmektedir. Bu amaçla, doğrusal olmayan bir model gösteren bitkinin boy uzunluğu ile zaman ilişkisi, belli noktalarda zıplamalar gösterirken bazı noktalarda kesilmeler gösterebilmektedir. Bu çalışmamızda buğday bitkisinin boy uzunluğu ve zaman ilişkisi açısından parçalı regresyon modelinin parametre tahmini ve zıplama noktalarının tahmin edilmesi ele alınmıştır
Academic platform-Journal of engineering and science, May 25, 2019
Bu calismada Weibull dagilimina sahip ilerleyen tur tip 2 sansurlu orneklemlerde parametre tahmin... more Bu calismada Weibull dagilimina sahip ilerleyen tur tip 2 sansurlu orneklemlerde parametre tahmini probleminde Newton yontemine alternatif bir cozum onerilmistir. Newton yontemi en cok olabilirlik tahmininde siklikla kullanilmaktadir. Newton yontemi populer olmasina ragmen en buyuk dezavantaji en az iki kez turevlenebilir fonksiyonlar icin kullanilabilmesidir. Olabilirlik fonksiyonu sansurlu orneklemlerde tam orneklemlere gore fonksiyonel olarak daha kompleks bir yapida oldugundan, turev ve diger hesaplamalar nispeten daha karisiktir. Bu calismada en cok olabilirlik yonteminde elde edilen denklem sisteminin cozumu icin Newton metodunun kullanimindaki kisitlamalara bir alternatif olarak Genetik Algoritma onerilmistir. Detayli bir simulasyon calismasi yardimiyla yan ve hata kareler ortalamasi ile iki yontemin performanslari degerlendirilmistir. Simulasyon sonuclarina gore onerilen yontemin karsilastirilan tum durumlar icin olcek parametresi icin daha iyi sonuclar verdigi, sekil parame...
Background/Aim: Colonoscopy may be associated with pain due to distension of colonic mesentery an... more Background/Aim: Colonoscopy may be associated with pain due to distension of colonic mesentery and air insufflation into the colonic lumen, although Sedo-analgesia may increase the tolerability of the procedure. This randomized, prospective, controlled study based on our clinical observations aimed to explore the sustainability of comfort provided by intraoperative sedation by allowing gas discharge via anoscopy while patients were still sedated. Methods: The patients that underwent colonoscopy for colorectal cancer screening were considered for this study and a total of 100 patients were (61 male and 39 female) were included in this study. Colonoscopy procedures were carried out by two experienced endoscopists who are adequately trained. Following the colonoscopy, 50 patients in the study group were administered a disposable anoscope with sterile, water-soluble, lubricant gel while the effect of sedation was still maintained. Endoscopist compressed four abdominal quadrants for 5 se...
Cumhuriyet Science Journal
Sakarya Universitesi Fen Bilimleri Enstitusu Dergisi, 2004
Journal of Selcuk University Natural and Applied Science, Apr 2, 2013
Http Dx Doi Org 10 1080 02664763 2014 1000275, Jan 8, 2015
ABSTRACT Bimodal mixture Weibull distribution being a special case of mixture Weibull distributio... more ABSTRACT Bimodal mixture Weibull distribution being a special case of mixture Weibull distribution has been used recently as a suitable model for heterogeneous data sets in many practical applications. The bimodal mixture Weibull term represents a mixture of two Weibull distributions. Although many estimation methods have been proposed for the bimodal mixture Weibull distribution, there is not a comprehensive comparison. This paper presents a detailed comparison of five kinds of numerical methods, such as maximum likelihood estimation, least-squares method, method of moments, method of logarithmic moments and percentile method (PM) in terms of several criteria by simulation study. Also parameter estimation methods are applied to real data.
We introduce structural change tests on linear regression models. Properties of structural tests ... more We introduce structural change tests on linear regression models. Properties of structural tests are decribed and an application of tests done on a data sets on deposit interest rate for Latvia, Holland and Turkey which gets from unistat and Tuik.
Journal of Applied Statistics, 2015