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Goktas, Sertac,Kerimov, Nazim B.,Maris, Emir A. Korean Mathematical Society 2017 대한수학회지 Vol.54 No.4
The spectral problem $$-y^{{\prime}{\prime}}+q(x)y={\lambda}y,\;0 < x < 1, \atop y(0)cos{\beta}=y^{\prime}(0)sin{\beta},\;0{\leq}{\beta}<{\pi};\;{\frac{y^{\prime}(1)}{y(1)}}=h({\lambda})$$ is considered, where ${\lambda}$ is a spectral parameter, q(x) is real-valued continuous function on [0, 1] and $$h({\lambda})=a{\lambda}+b-\sum\limits_{k=1}^{N}{\frac{b_k}{{\lambda}-c_k}},$$ with the real coefficients and $a{\geq}0$, $b_k$ > 0, $c_1$ < $c_2$ < ${\cdots}$ < $c_N$, $N{\geq}0$. The sharpened asymptotic formulae for eigenvalues and eigenfunctions of above-mentioned spectral problem are obtained and the uniform convergence of the spectral expansions of the continuous functions in terms of eigenfunctions are presented.
Sertac Goktas,Nazim B. Kerimov,Emir A. Maris 대한수학회 2017 대한수학회지 Vol.54 No.4
The spectral problem \[\begin{matrix} -{y}''+q(x)y=\lambda y,{ }0<x<1, \\ y(0)\cos \beta ={y}'(0)\sin \beta ,{ }0\le \beta <\pi ;{ }\frac{{y}'(1)}{y(1)}=h(\lambda ), \\ \end{matrix}{ }\] is considered, where $\lambda $ is a spectral parameter, $q(x)$ is real-valued continuous function on $[0,1]$ and \[h(\lambda )=a\lambda +b-\sum_{k=1}^{N}{\frac{{{b}_{k}}}{\lambda -{{c}_{k}}}},\] with the real coefficients and $a\ge 0,{{b}_{k}}>0,{{c}_{1}}<{{c}_{2}}<\cdots<{{c}_{N}},N\ge 0.$ The sharpened asymptotic formulae for eigenvalues and eigenfunctions of above-mentioned spectral problem are obtained and the uniform convergence of the spectral expansions of the continuous functions in terms of eigenfunctions are presented.
A review of ICT related courses in pre-service teacher education programs
Yuksel Goktas 서울대학교 교육연구소 2008 Asia Pacific Education Review Vol.9 No.2
This study investigated teacher educators', prospective teachers', and K-12 teachers' opinions about the effectiveness of ICT related courses and the ways to improve the courses in Turkey's pre-service teacher education programs. The researchers used both quantitative and qualitative research approaches within the data collection and analysis processes. The data were collected from 111 teacher educators, 1,330 prospective teachers, and 1,429 K-12 teachers through questionnaires; and from 6 teacher educators, 6 prospective teachers, and 6 K-12 teachers through interviews. Even though a majority of the participants felt that ICT related courses are effective, most participants recommended that these courses need to be redesigned to be more beneficial in practice.
Hilal Dikmen,Hamza Goktas,Fatmanur Demirbas,Selma Kayacan,Humeyra Ispirli,Muhammet Arici,Mustafa Turker,Osman Sagdic,Enes Dertli 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.3
In this study, Streptococcus thermophilus and Lactobacillus bulgaricus strains from traditional Turkish yoghurts were isolated, identified by 16S rRNA sequencing and genotypically 14 S. thermophilus and 6 L. bulgaricus strains were obtained as distinct strains by MLST analysis. Lactic acid production levels of the L. bulgaricus strains were higher than S. thermophilus strains. HPLC analysis showed that EPS monosaccharide composition of the strains mainly consisted of glucose and galactose. In general, all strains were found to be susceptible for antibiotics, except some strains were resistance to gentamicin and kanamycin. Apart from two strains of S. thermophilus, all strains displayed strong auto-aggregation level greater than 95% at 24 h incubation. S. thermophilus strains showed higher cell surface hydrophobicity than L. bulgaricus strains. This study demonstrated the isolation, identification, genotypic discrimination and techno-functional features of wild type yoghurt starter cultures which can potentially find place in industrial applications.
Lack of any Prognostic Role of Insulin-Like Growth Factor-1 Receptor in Non-Small Cell Lung Cancer
Dilli, Utku Donem,Yildırim, Mustafa,Suren, Dinc,Alikanoglu, Arsenal,Kaya, Vildan,Goktas, Sevil,Yildiz, Mustafa,Sezer, Cem,Gunduz, Seyda Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.14
Background: The purpose of this study is to determine whether the IGF1R expression has a prognostic role in non-small cell lung cancer. Materials and Methods: Forty-seven patients histopathologically diagnosed with small cell lung cancer upon bronchoscopic biopsy or resection materials were included in the study. IGF1R expression was examined via immunohistochemical methods. In samples, >10% staining were assessed as positive and ${\leq}10%$ as negative. Information about demographic datas and treatments was obtained by retrospective searches of patient files. Results: IGF1R expression was determined as positive in 38 (80.9%) and as negative in 9 (19.1%) patients. There was no significant relation between IGF1R expression and histological sub-type, local invasion, lymph node and metastasis status (p=0.842, p=0.437, 0.064, 0.447, respectively). There was also no correlation with IGF1R expression and survival (p=0.141). Conclusions: There are conflicting results between IGF1R and its prognostic effects in the various studies. It has been claimed in some studies it is not related to prognosis as in our study, and in some studies it has been claimed that it is a good prognostic factor whereas in some studies it has been claimed as being a factor for worse prognosis. We think that IGF1R expression in non-small cell lung carcinoma patients deserves further analysis, because of its potential prognostic and predictive roles.
Non-Hodgkin Lymphoma and Pesticide Exposure in Turkey
Yildirim, Mustafa,Karakilinc, Hulya,Yildiz, Mustafa,Kurtoglu, Erdal,Dilli, Utku Donem,Goktas, Sevil,Demirpence, Ozlem,Kaya, Vildan Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.6
Background: Non-Hodgkin lymphoma (NHL) is a solid tumour of lymphocytes, important elements in the immune system. According to 2006 data, in Turkey the incidence was 6.5 per 100,000 in males, and 4.4 in females. The relationship between the use of pesticides and development of NHL has been extensively investigated in many studies, and it has been demonstrated that the risk of NHL is increased by exposure to such compounds. Antalya is a region of intensive agricultural activity. In this study, the relationship between the incidence of lymphoma in Antalya and the amount of pesticides employed was investigated. Materials and Methods: The study used data from 1995 to 2010 on the patients from the databank of TR Ministry of Health, Antalya Provincial Health Directorate, Cancer Registration Center and the patients who were histopathologically diagnosed with NHL during these years. Results: The relationship between the amount of pesticide used and the incidence was studied with the Spearman correlation analysis and the p value was found as 0.05. The correlation coefficient was 0.497. An increase in the NHL incidence over the years was identified, with a 2.42-fold increment found from 1995 to 2005 and a 2.77 fold elevation from 1995 to 2010. The use of pesticides increased 1.89 fold over the same period. Conclusions: Our study investigated the relationship of the pesticides used with NHL patients diagnosed during the same year. Since the time elapsing after exposure to pesticides until the development of cancer is not clear, no comparison can be made at present. We believe that the increase in use of pesticides since 1995 may be associated with the increase in the incidence of NHLand therefore that further studies on the issue including measurements of serum pesticide levels, are required.
Onder Canguven,Cihangir Çetinel,Rahim Horuz,Fatih Tarhan,Bilal Hamarat,Cemal Goktas 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.6
Purpose: Ischemic priapism, a compartment syndrome, requires urgent treatment in order to nourish the corpora cavernosa. As the first step, aspiration of blood and irrigation of the cavernosal bodies is performed to prevent fibrotic activity and secure erectile capability. During aspiration, there are risks of cardiovascular side effects of adrenergic agonists. We aimed to evaluate a transient distal penile corporoglanular shunt technique in place of aspiration and irrigation techniques for treatment of early ischemic priapism. Materials and Methods: A transient distal penile shunt was applied to 15 patients with early ischemic priapism between January 2011 and May 2012. Priapism duration, history,causes, pain, and any prior management of priapism were assessed in all patients. A complete blood count and penile Doppler ultrasonography were performed, which showed attenuated blood flow in the cavernosal artery. A sterile closed system blood collection set, which has two needles and tubing, was used for the transient distal penile shunt. Results: Ten of 15 patients with early ischemic priapism were successfully treated with this transient shunt technique. No additional procedures were needed after the resolution of rigidity in the 10 successfully treated patients. Conclusions: The transient nature of this technique is an advantage over aspiration and irrigation in the treatment of early ischemic priapism. Our results indicate that the technique can be offered for patients with an ischemic priapism episode of no more than 7 hours.