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RISS 인기검색어
- 검색키워드
- 저자 : Kilbas, Zafer (검색결과 6 건)
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HADAMARD-TYPE FRACTIONAL CALCULUS
Anatoly A.Kilbas Korean Mathematical Society 2001 대한수학회지 Vol.38 No.6
The paper is devoted to the study of fractional integration and differentiation on a finite interval [a, b] of the real axis in the frame of Hadamard setting. The constructions under consideration generalize the modified integration $\int_{a}^{x}(t/x)^{\mu}f(t)dt/t$ and the modified differentiation ${\delta}+{\mu}({\delta}=xD,D=d/dx)$ with real $\mu$, being taken n times. Conditions are given for such a Hadamard-type fractional integration operator to be bounded in the space $X^{p}_{c}$(a, b) of Lebesgue measurable functions f on $R_{+}=(0,{\infty})$ such that for c${\in}R=(-{\infty}{\infty})$, in particular in the space $L^{p}(0,{\infty})\;(1{\le}{\le}{\infty})$. The existence almost every where is established for the coorresponding Hadamard-type fractional derivative for a function g(x) such that $x^{p}$g(x) have $\delta$ derivatives up to order n-1 on [a, b] and ${\delta}^{n-1}[x^{\mu}$g(x)] is absolutely continuous on [a, b]. Semigroup and reciprocal properties for the above operators are proved.
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Solution in Closed Form of Boundary Value Problem for Degenerate Equation of Hyperbolic Typ
Anatoly A. Kilbas ...et al KYUNGPOOK UNIVERSITY 1996 Kyungpook mathematical journal Vol.36 No.2
The paper deals with a boundary value problem for a partial differential equation ofhyperbolic type with boundary conditions involving generalized fractional integrals andderivatives with the Gauss hypergeometric function in the kernel. By using the propertiesof the fractional calculus operators in Hölder spaces it is shown that this problem canbe reduced to a singular integral equation with the Cauchy kernel, and its solvabilityconditions and a solution in a closed form are given.
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Predictors Affecting Breast Self-Examination Practice among Turkish Women
Doganer, Yusuf C.,Aydogan, Umit,Kilbas, Zafer,Rohrer, James E.,Sari, Oktay,Usterme, Necibe,Yuksel, Servet,Akbulut, Halil,Balkan, Salih M.,Saglam, Kenan,Tufan, Turgut Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.20
Background: Breast cancer (BC) is the most common cancer among females in Turkey. Predictors affecting the breast self-examination (BSE) performance vary in developing countries. Objective: To determine the frequency of BSE performance and predictors of self-reported BSEs among women in the capital city of Turkey. Materials and Methods: This cross-sectional study was conducted on 376 Turkish women using a self-administered questionnaire covering socio-demographic variables and BSE-related features. Results: Of the participants, 78.7% (N=296) reported practicing BSE, whereas 9.5% (N=28) were implementing BSE regularly on a monthly basis, and only 5.7% (N=17) were performing BSE regularly within a week after each menstrual cycle. Multivariate logistic regression modeling revealed that BSE performance was more likely in younger age groups [20-39 years] (p=0.018, OR=3.215) and [40-49 years] (p=0.009, OR=3.162), women having a family history of breast disease (p=0.038, OR=2.028), and housewives (p=0.013, OR=0.353). Conclusions: Although it appears that the rates of BSE performers are high, the number of women conducting appropriate BSE on a regular time interval basis is lower than expected. Younger age groups, family history of breast diseases and not being employed were identified as significant predictors of practicing BSE appropriately. Older age and employment were risk factors for not performing BSE in this sample.
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Predictors of Knowledge Level and Awareness towards Breast Cancer among Turkish Females
Aydogan, Umit,Doganer, Yusuf C.,Kilbas, Zafer,Rohrer, James E.,Sari, Oktay,Usterme, Necibe,Yuksel, Servet,Akbulut, Halil,Balkan, Salih M.,Saglam, Kenan,Tufan, Turgut Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.1
Background: Breast cancer (BC) is the most-common malignancy of women worldwide. Though there are differences among developed and developing countries, BC remains the most common cancer type of women in Turkey. Objective: This study aimed to identify the level of knowledge, awareness, and their potential predictors towards BC in Ankara, Turkey. Materials and Methods: The present descriptive study was conducted on 376 females attending a breast health outpatient clinic. A self-administered questionnaire was designed to evaluate knowledge level about BC and predictors effecting its level. Data analysis was performed using the chi-square test. A value of p<0.05 was considered statistically significant. Results: Mean age of the participants was $46.2{\pm}9.93$ (22-75). The majority (92.6 %) were married; 41.5% were educated less than nine years. Most of the women were housewives (82.7%) and, were living in an urban region (86.4%). Predictors of effecting responses to seven knowledge and awareness questions about BC varied from demographic features including older age groups, higher educational levels, being married, living in an urban area, being employee, smoking, having greater BMI to additional attributes associated breast health such as the increased number of births, applying for the purpose of control, positive family history of breast diseases, any diagnoses of breast diseases and performing BSE practice. Conclusions: It was determined that females in Turkey have better knowledge of BC than other developing countries even though it is not at the desired level. These findings revealed that females should be more informed about BC risk factors, prognosis and treatments by primary health-care providers to counteract the ascending burden of this disease.
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박길배(Kilbae Park),박희준(HeaJun Park),기호철(Hocheul Ki) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.4
To reduce the exterior noise level of EMU, there are several ways have been evaluated. The noise sources for the exterior noise level are the traction motor, driving gear and wheel/rail rolling noise. In this article, the ways to mitigate the noise issue for EMU have been investigated and especially the way to protect the noise radiation from the bogie area and wheel/rail rolling noise. The way to evaluate the effect of the side skirt has been reviewed. To install the side skirt, the interface between the side skirt and the carbody and bogie should be examined and the acoustic design of the side skirt will be evaluated.
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FDS(Fire Dynamics Simulator)를 이용한 전동차 화재감지 시뮬레이션
양성진(Sung Jin Yang),이창덕(Chang Deok Lee),노주현(Joo-Hyun Rho),박길배(Kilbae Park),이강운(Kang Wun Lee),김창용(Chang Yong Kim),박원희(Won Hee Park),이원용(Won-yong Lee) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10
철도차량 기술기준에 의거 화재위험이 있다고 판단되는 차량의 구획공간에는 화재감지기가 설치되어야 한다. 이에 따라서 철도차량의 객실 천정 부에는 열·연기 복합 화재감지기가 설치되며 이는 지정된 연기 농도(15%/m)와 온도(65℃)조건에서 화재 상황임을 인지하여 감지신호를 송출한다. 이때 해당 구획공간 내 감지기 수량과 배치 등의 설계변수가 화재감지 응답속도에 영향을 주는 인자로 작용한다. 본 연구에서는 FDS(Fire Dynamics Simulator) 해석 툴을 이용하여 화재성장을 모사하고 설정된 감지기 수량과 배치 조건에서 감지 응답속도를 예측하고자 하며 이를 통해 해당 설계 타당성과 전동차 화재감지성능을 검토하였다. Fire detector shall be equipped within a confined area which may lead to risk of fire in accordance with the Technical Specifications for Urban Railway Vehicles (KTRS-VE-Part51). As per this technical guidelines, heat and smoke detector are considered generally to the vehicle design to perceive the fire occurring at the condition of pre-determined temperature (65℃) and smoke concentration (15%/m). In considering fire detection design, parameters such as amount of detectors and its arrangement deemed to be main factors could affect on detecting promptness. The aim of this study is to review the parameter adequacy for fire detection design by simulating the fire growth and detection time for the typical urban railway vehicle by using of FDS (Fire Dynamics Simulator)
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