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Karakus, Melike,Sung, Younghun,Wang, Hai I.,Mics, Zoltá,n,Char, Kookheon,Bonn, Mischa,Cá,novas, Enrique American Chemical Society 2017 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.121 No.24
<P>We investigate photoinduced carrier dynamics by time resolved terahertz spectroscopy (TRTS) in Pt nanoparticle decorated CdSe tetrapods as a function of Pt nanoparticles size (and identical areal density). We find that the collection efficiency of electrons photo generated in the tetrapods by the Pt particle increases as a function of Pt nanoparticle size. However, the photocatalytic H-2 generation efficiency is reduced for tetrapods decorated with larger Pt particles. Our results demonstrate a competition between electron capture efficiency at the semiconducting/metal interface, increasing with nanoparticles size, and electron release efficiency at the metal/water interface, decreasing with nanoparticles size. This trade-off defines an optimum for photocatalytic H-2 generation in Pt cocatalyst decorated CdSe tetrapods as a function of Pt size.</P>
A NEW APPROACH FOR CHARACTERIZATION OF CURVE COUPLES IN EUCLIDEAN 3-SPACE
Karakus, Siddika Ozkaldi,Ilarslan, Kazim,Yayli, Yusuf The Honam Mathematical Society 2014 호남수학학술지 Vol.36 No.1
In this study, we have investigated the possibility of whether any Frenet plane of a given space curve in a 3-dimensional Euclidean space $\mathbb{E}_3$ also is any Frenet plane of another space curve in the same space. We have obtained some characterizations of a given space curve by considering nine possible case.
Mehmet Karakus,Mehmet Ustuner,Mustafa Toprak 한국교육개발원 2014 KEDI Journal of Educational Policy Vol.11 No.1
This study aims to determine the relationships between organizational justice and affective and normative based outcome variables of education supervisors. Two alternative structural equation models were tested. The first model proposed burnout is the outcome of organizational justice and the antecedent of the variables of job satisfaction and organizational commitment. The second model proposed burnout is the outcome of the variables of organizational justice, job satisfaction, and organizational commitment. Although both the models had acceptable fit indices, the comparative fit indices showed the second model was more preferable. In this model, justice perceptions were found to have a positive effect on organizational commitment through the partial mediation effect of job satisfaction, and a negative effect on burnout through the full mediation effect of job satisfaction.
A New Approach for Characterization of Curve Couples in Euclidean 3-space
( Siddika Ozkaldi Karakus ),( Kazim Olarslan ),( Yusuf Yayli ) 호남수학회 2014 호남수학학술지 Vol.36 No.1
In this study, we have investigated the possibility of whether any Frenet plane of a given space curve in a 3-dimensional Euclidean space E3also is any Frenet plane of another space curve in the same space. We have obtained some characterizations of a given space curve by considering nine possible case.
Suleyman Cuneyt Karakus,Huseyin Kilincaslan,Naim Koku,Idris Ertaskin 대한외과학회 2013 Annals of Surgical Treatment and Research(ASRT) Vol.85 No.2
Purpose: Since laparoscopic appendectomy was first described, various modifications, such as single port incisionless-intracorporeal conventional equipmentendoscopic surgery (SPICES), have been described for reducing pain and improving cosmetic results. In the retrocecal and retrocolic positions, attachments to the lateral peritoneum and cecum may lead to difficulties during SPICES, which is performed with only one port. Here, we present the effects of variations in the position of the vermiform appendix in treating acute appendicitis with SPICES. Methods: We retrospectively reviewed 52 children who underwent SPICES for acute appendicitis between March 2010 and November 2011 in our institution. One group (group A) consisted of 30 patients (mean age, 10.5 ± 2.5 years) with retrocecal appendix, while the other group (group B) included 22 patients (mean age, 10.9 ± 2.3 years) with the appendix lying free in the peritoneal cavity. Results: There were no significant differences between groups in terms of patient age, gender, success rate of SPICES, mean operating time, mean follow-up period, overall complication rates or mean postoperative hospitalization period. Conclusion: These results suggest that SPICES is a safe and feasible approach even in patients with retrocecal acute appendicitis.
A bibliometric mapping of shadow education research: achievements, limitations, and the future
Hajar, Anas,Karakus, Mehmet 서울대학교 교육연구소 2022 Asia Pacific Education Review Vol.23 No.2
This study aims to map the literature on shadow education using metadata extracted from 488 publications indexed in the Web of Science database. It is termed as shadow education because much of its content mimics what is learned in schools. The study uses bibliometric procedures to describe and visually represent available literature on shadow education in terms of main sources, key authors, institutions, and countries leading the production and dissemination of research on shadow education. Further, the study elaborates on h-classics publications to obtain an in-depth understanding of the most influential scientific outputs in this domain. Key findings of the study are that research on shadow education (a) has experienced steady growth over the last decade; (b) is disseminated through a wide range of outlets, mainly in the disciplines of sociology of education, economics of education, educational psychology, and language education; (c) is published mainly by scholars working in East Asia and the United States; (d) has focused on tangible (quantifiable) benefits related to improved examination results; and (e) reveals how this form of instruction primarily benefits students hailing from high socioeconomic backgrounds, thereby contributing to greater educational inequality. This study also suggests pedagogical implications and areas for ongoing research.
A giant choledochal cyst in infancy: a case report
Yurttutan, Nursel,Karakus, Suleyman Cuneyt,Koku, Naim,Demirci, Mustafa,Ucak, Ramazan The Korean Pediatric Society 2016 Clinical and Experimental Pediatrics (CEP) Vol.59 No.5
Choledochal cyst is a dilation that encloses the intrahepatic or both extra- and intrahepatic portions of the biliary ducts. Postnatally, ultrasonography is the initial diagnostic modality of choice, allowing for precise measurements of intra- or extrahepatic duct dilatation and identification of stones and sludge. Symptoms depend on the age at presentation. Common bile duct malformations should be considered as a differential diagnosis of a cystic mass regardless of the cyst's size or patient's age, especially in children presenting with abdominal pain, jaundice, and palpable mass. To the best of our knowledge, we report the largest choledochal cyst in infancy.
Temperament in Adulthood Attention Deficit-Hyperactivity Disorder without Bipolar Disorder
Filiz Ozdemiroglu,Kadir Karakus,Cagdas Oyku Memis,Levent Sevincok,Sanem Mersin 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.3
Objective-We examined whether some temperamental traits would be associated with persistence of attention deficit-hyperacitivty disorder (ADHD) in adulthood independent from bipolar disorder (BD). Methods-Eighty-one ADHD patients without a comorbid diagnosis of BD were divided into two groups, those with childhood ADHD (n=46), and those with Adulthood ADHD (n=35). The severity of childhood and adulthood ADHD were assessed by using the Wender Utah Rating Scale (WURS-25) and Turgay’s Adult ADD/ADHD Diagnosis and Evaluation Scale (DES). Subjects’ temperamental characteristics were examined using the Temperament Evaluation of Memphis, Pisa, Paris and San Diego-auto questionnaire (TEMPS-A). Results-The mean scores of WURS-25 were higher in adult ADHD group than in childhood ADHD group (p<0.001). Adult ADHD group had significantly higher scores on cyclothymic (p=0.002), irritable (p<0.0001), and anxious (p=0.042) subscales of TEMPS-A. The scores of WURS-25 in adulthood ADHD group were positively correlated with cyclothymia scores (r=0.366, p=0.033). Total scores of Turgay’s Adult ADD/ADHD DES were positively correlated with cyclothymic (r=0.354, p=0.040), hyperthymic (r=0.380, p=0.026), and irritable (r=0.380, p=0.026) subscale scores. Cychlothymic and irritable temperaments were significantly associated with the severity of adulthood symptoms of ADHD. Conclusion-We might suggest that cyclothymic and irritable temperaments would predict the diagnosis of adulthood ADHD independent from BD.
CURVE COUPLES AND SPACELIKE FRENET PLANES IN MINKOWSKI 3-SPACE
Ucum, Ali,Ilarslan, Kazim,Karakus, Siddika Ozkaldi The Honam Mathematical Society 2014 호남수학학술지 Vol.36 No.3
In this study, we have investigated the possibility of whether any spacelike Frenet plane of a given space curve in Minkowski 3-space $\mathbb{E}_1^3$ also is any spacelike Frenet plane of another space curve in the same space. We have obtained some characterizations of a given space curve by considering nine possible case.
A giant choledochal cyst in infancy: a case report
Nursel Yurttutan,Suleyman Cuneyt Karakus,Naim Koku,Mustafa Demirci,Ramazan Ucak 대한소아청소년과학회 2016 Clinical and Experimental Pediatrics (CEP) Vol.59 No.5
Choledochal cyst is a dilation that encloses the intrahepatic or both extra- and intrahepatic portions of the biliary ducts. Postnatally, ultrasonography is the initial diagnostic modality of choice, allowing for precise measurements of intra- or extrahepatic duct dilatation and identification of stones and sludge. Symptoms depend on the age at presentation. Common bile duct malformations should be considered as a differential diagnosis of a cystic mass regardless of the cyst’s size or patient’s age, especially in children presenting with abdominal pain, jaundice, and palpable mass. To the best of our knowledge, we report the largest choledochal cyst in infancy.