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Bahar Yeş,il Ö,rnek,Birgü,l Elbozan Cumurcu,Esra Porgali Zayman 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.10
Objective Functional neurogical symptom disorder (FNSD) is a somatic symptom disorder with loss of voluntary motor or sensory functions, which cannot be explained by another medical condition. The study aimed to examine the relationship of vasopressin and oxytocin in persistent type FNSD. Methods This study included 27 female patients between the ages of 20-57 who were diagnosed with FNSD according to DSM-5 and 27 healthy controls matched in terms of age and gender. Serum vasopressin and oxytocin levels were measured twice on the same day in fasting blood samples and the results were compared statistically. Results Vasopressin were lower in patients compared to controls while there was no difference between oxytocin levels. Childhood traumas were more common in patient group, and mean oxytocin level was lower in patients who exposed to childhood trauma, compared to controls. No significant difference was found between the groups in terms of vasopressin. Conclusion Changes in vasopressin and oxytocin balance in the pathogenesis of persistant FNSD, may likely to lead to physiological and behavioral consequences. Lower oxytocin levels may also be a marker of exposure to childhood trauma in FNSD. These neuropeptides plays important role in neuroendocrine balance of emotional behavior.
B\"{u}lent Nafi \"{O}rnek 대한수학회 2016 대한수학회보 Vol.53 No.2
In this paper, a boundary version of the Schwarz lemma is investigated. We take into consideration a function $f(z)=z+c_{p+1}z^{p+1}+c_{p+2}z^{p+2}+\cdots$ holomorphic in the unit disc and $\left\vert \frac{f(z)}{\lambda f(z)+(1-\lambda )z}-\alpha \right\vert <\alpha $ for $\left\vert z\right\vert <1$, where $\frac{1}{2}<\alpha \leq \frac{1}{1+\lambda }$, $ 0\leq $ $\lambda <1$. If we know the second and the third coefficient in the expansion of the function $f(z)=z+c_{p+1}z^{p+1}+c_{p+2}z^{p+2}+\cdots$, then we can obtain more general results on the angular derivatives of certain holomorphic function on the unit disc at boundary by taking into account $ c_{p+1}$, $c_{p+2}$ and zeros of $f(z)-z$. We obtain a sharp lower bound of $ \left\vert f^{\prime }(b)\right\vert $ at the point $b$, where $\left\vert b\right\vert =1$.
Bahar Yeş,il Ö,rnek,İ,brahim Gü,ndoğ,muş 대한신경정신의학회 2022 PSYCHIATRY INVESTIGATION Vol.19 No.1
Objective Smartphone addiction is a public health problem increasing with the technologic developments. It particularly affects the university students negatively in terms of psychological, physical, academic achievement and social relations. This study aims to investigate the relation of eating attitudes between smartphone addiction and internet gaming disorder, also the relation of smartphone addiction with obesity.Methods This cross-sectional and prospective study is consisted of 358 volunteer university students. Socio-demographic data form, Short Form of Smartphone Addiction Scale (SF-SAS), Eating Attitude Test (EAT), and internet gaming disorder scale were administered to the participants.Results Mean age of the participants was 22.27±3.10 years and 59.8% (n=214) were female. In terms of the variables “body mass index, body weight, faculty of the student, economic status of the family, and the people they live with together” were significantly different from controls. Also “monthly mobile phone invoice, EAT score, SF-SAS scores” were statistically different. A significant difference was found among “body weight groups” in terms of both EAT score and SF-SAS. According to the linear regression model variables of “gender, smartphone addiction, and school year” were determined as the predictors for EAT.Conclusion Our current study has revealed the relation between smartphone addiction and eating attitudes, and obesity. Smartphone addiction may lead to an increase in body weight, by affecting eating attitudes. Therefore, the effect of eating behavior disorders in the emergence of the smartphone addiction should be considered. Multi-disciplinary solutions are required to prevent this addiction that may increase over time.
Cem Örnek,Bilgehan M. Şeşen,Mustafa K. Ürgen 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.2
This paper provides a mechanistic understanding of hydrogen-microstructure-strain interactions in a finely-grained 25Cr–7Nisuper duplex stainless steel subjected to dynamic tensile loading. Miniature-sized tensile specimens were hydrogen-chargedfor up to nine days, and the microstructure was imaged, in-situ, during mechanical tensile testing. Digital image correlationanalysis of the recorded images revealed that the austenite phase underwent softening while the ferrite phase hardened due touptaken hydrogen. Severe strain localization occurred due to dissolved hydrogen in the microstructure resulting in hydrogeninducedcracks. Mobile hydrogen atoms caused softening of the microstructure while trapped hydrogen reasoned hardening. The austenite’s hydrogen absorption capacity is decisive for the susceptibility to hydrogen embrittlement.
APPLICATIONS OF THE SCHWARZ LEMMA RELATED TO BOUNDARY POINTS
( Bülent Nafi Örnek ) 한국수학교육학회 2023 純粹 및 應用數學 Vol.30 No.3
Different versions of the boundary Schwarz lemma for the N (ρ) class are discussed in this study. Also, for the function g(z) = z+b<sub>2</sub>z<sup>2</sup>+b<sub>3</sub>z<sup>3</sup>+... defined in the unit disc D such that g ∈ N (ρ), we estimate a modulus of the angular derivative of g(z) function at the boundary point 1 ∈ ∂D with g′(1) = 1 + σ(1 - ρ), where ρ = 1/n∑<sup>n</sup><sub>i=1</sub> g(ci) = g′(c1)+g′(c2)+:::+g′(c<sub>n</sub>)/n ∈ g′(D) and ρ ≠ 1, σ > 1 and c1; c2, ..., c<sub>n</sub> ∈ ∂D. That is, we shall give an estimate below |g′′(1)| according to the first nonzero Taylor coefficient of about two zeros, namely z = 0 and z<sub>1</sub> ≠ 0. Estimating is made by using the arithmetic average of n different derivatives g′(c<sub>1</sub>), g′(c<sub>2</sub>), ..., g′(c<sub>n</sub>).
Estimates for a Certain Subclass of Holomorphic Functions
BÜLENT NAFI ÖRNEK,TUĞBA AKYEL 한국수학교육학회 2019 純粹 및 應用數學 Vol.26 No.2
In this paper, a version of the boundary Schwarz Lemma for the holomorphic function belonging to N(α) is investigated. For the function f(z) = z + c2z2 + c3z3 + ... which is defined in the unit disc where f(z) ∈ N(α), we estimate the modulus of the angular derivative of the function f(z) at the boundary point b with f(b) = 1 b b ∫ 0 f(t)dt. The sharpness of these inequalities is also proved.
On a Class of Analytic Function related to Schwarz Lemma
Bülent Nafi ÖRNEK 한국수학교육학회 2022 純粹 및 應用數學 Vol.29 No.1
In this paper, we plan to introduce the class of the analytic functions called $\mathcal{P}\left( b\right) $ and to investigate the various properties of the functions belonging this class. The modulus of the second coefficient $c_{2}$ in the expansion of $f(z)=z+c_{2}z^{2}+...$ belonging to the given class will be estimated from above. Also, we estimate a modulus of the second angular derivative of $f(z)$ function at the boundary point $% \alpha $ with $f^{\prime }(\alpha )=1-b$, $b\in %TCIMACRO{\U{2102} }% %BeginExpansion \mathbb{C} %EndExpansion $, by taking into account their first nonzero two Maclaurin coefficients.
AN IMPROVED LOWER BOUND FOR SCHWARZ LEMMA AT THE BOUNDARY
Bülent Nafi ÖRNEK,Tuğba AKYEL 한국수학교육학회 2016 純粹 및 應用數學 Vol.23 No.1
In this paper, a boundary version of the Schwarz lemma for the holomrophic function satisfying f(a)=b, |a|<1, b∈ℂ and ℜf(z)>α, 0≤α<|b| for |z|<1 is invetigated. Also, we estimate a modulus of the angular derivative of f(z) function at the boundary point c with ℜf(c)=α. The sharpness of these inequalities is also proved.
CARATHÉODORY'S INEQUALITY ON THE BOUNDARY
BÜlent Nafi Örnek 한국수학교육학회 2015 純粹 및 應用數學 Vol.22 No.2
In this paper, a boundary version of Carathéodory's inequality is in- vestigated. Also, new inequalities of the Carathéodory's inequality at boundary are obtained and the sharpness of these inequalities is proved.
APPLICATIONS OF THE JACK'S LEMMA FOR ANALYTIC FUNCTIONS CONCERNED WITH ROGOSINSKI'S LEMMA
( Bülent Nafi Örnek ) 한국수학교육학회 2021 純粹 및 應用數學 Vol.28 No.3
In this study, a Schwarz lemma at the boundary for analytic functions at the unit disc, which generalizes classical Schwarz lemma for bounded analytic functions, is considered. The results of Rogosinskis lemma and Jacks lemma have been utilized to derive novel inequalities. Also, these inequalities have been strengthened by considering the critical points which are different from zero.