• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권8호
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• pp.2783-2804
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• 2021

In the network function virtualization environment, dynamic changes in network traffic will lead to the dynamic changes of service function chain resource demand, which entails timely dynamic adjustment of service function chain resource configuration. At present, most researches solve this problem through virtual network function migration and link rerouting, and there exist some problems such as long service interruption time, excessive network operation cost and high penalty. This paper proposes a dynamic adjustment method of service function chain resource configuration for the dynamic changes of network traffic. First, a dynamic adjustment request of service function chain is generated according to the prediction of network traffic. Second, a dynamic adjustment strategy of service function chain resource configuration is determined according to substrate network resources. Finally, the resource configuration of a service function chain is pre-adjusted according to the dynamic adjustment strategy. Virtual network functions combination and virtual machine reusing are fully considered in this process. The experimental results show that this method can reduce the influence of service function chain resource configuration dynamic adjustment on quality of service, reduce network operation cost and improve the revenue of service providers.

• 정보보호학회논문지
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• 제17권4호
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• pp.47-52
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• 2007

본 논문에서는 파이프 해쉬 함수를 가진 동적 파이프 해쉬 함수를 제안한다. 안전도를 높이기 위하여, 압축함수를 추가하여 파이프 기반 동적 해쉬 함수를 제안하였다. 제안한 동적 파이프 해쉬 함수는 다중충돌공격에 안전하고 압축 사이즈를 가변할 수 있기 때문에 많은 장점을 가지고 있다. 예를 들어, 디지털 서명 프로토콜에서 사용자가 보다 큰 키 사이즈를 선택하여 높은 안전도를 요구한다면, 동적 해쉬 함수를 사용하여 압축사이즈를 증가시켜 쉽게 실현할 수 있다.

• Human Ecology Research
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• 제60권2호
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• pp.177-186
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• 2022

The purpose of this study was to explore the relationships among mothers' reflective function, preschoolers' empathy, executive function, caring behaviors. Subjects for this study were 498 preschoolers and their mothers. Mothers' reflective function was assessed by the Parental Reflective Functioning Questionnaire(PRFQ). Preschoolers' empathy was assessed by the Questionnaire of Cognitive and Affective Empathy(QCAE). Preschoolers' executive function was assessed by the Behavioral Rating Inventory of Executive Functions-Preschool Version(BRIEF-P), and caring behaviors were assessed by the caring behaviors scale(Kim, 2015). Data were analyzed using descriptive statistics, confirmatory factor analysis(CFA), and structural equation model(SEM) with the SPSS 25.0 and AMOS 23.0 program. The major results of this study were as follows. First, mothers' reflective function showed direct effects on preschoolers' empathy, executive function, and caring behaviors. Second, the preschoolers' empathy and executive function showed direct effects on preschoolers' caring behaviors. Third, preschoolers' empathy mediated the effects of mothers' reflective function on preschoolers' caring behaviors. The findings of this study will contribute to designing intervention programs to improve preschoolers' empathy, executive function, and caring behaviors.

• 한국전자통신학회논문지
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• 제8권11호
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• pp.1763-1770
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• 2013

본 연구는 뇌성마비아동의 신체적 기능과 기능적인 능력에 관한 기존의 연구에서 벗어나 아동의 사회적 능력, 의사소통 능력, 일상생활활동, 대근육활동 간의 상관관계를 연구하였다. 뇌성마비 진단을 받은 아동 43명을 대상으로 평가를 실시한 결과 사회적 기능, 일상생활활동, 의사소통능력, 대동작활동과의 상관관계에서 네영역 모두 유의미한 상관관계를 보였다. 특히 사회적 기능과 일상생활활동과 하부항목 간의 상관관계에서 높은 상관관계를 보였다. 또한 사회적 능력의 하부항목들과 의사소통능력과의 상관관계가 높은 반면 대근육활동과의 상관관계에서는 낮은 상관관계를 보였다. 이러한 연구결과는 재활영역에서 뇌성마비 아동들의 실제 생활에서의 문제에 초점을 맞추기 위해 기능의 사회적인 측면을 고려해야 함을 시사한다.

• 호남수학학술지
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• 제38권1호
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• pp.9-15
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• 2016

In this paper, the authors establish some double inequalities concerning the (q, k)-deformed Gamma function. These inequalities emanate from certain problems of traffic flow. The procedure makes use of the integral representation of the (q, k)-deformed Gamma function.

• 호남수학학술지
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• 제38권1호
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• pp.17-23
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• 2016

This paper deals with the study of newly defined special function known as k-Bessel's function due to Gehlot [2]. Certain integral representations of k-Bessel's function are investigated. Known integrals of classical Bessel's function are seen to follow as special cases of our main results.

• 한국수학사학회지
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• 제23권3호
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• pp.75-90
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• 2010

함수 개념을 실제로 사용되고 있는 측면에서 분석하면 인과, 명명, 연산, 변화, 도형, 형태, 변수, 범함수, 작용소 등 적어도 9가지의 양상이 존재한다. 이러한 분석을 통하여 함수 개념은 현재 3단계로 성장해 왔다는 것이 밝혀졌다.

• 한국통계학회:학술대회논문집
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• 한국통계학회 2004년도 학술발표논문집
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• pp.129-134
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• 2004

In this study, we investigate the effects of the weight function in the bounded influence regression quantile (BIRQ) estimator for the AR(1) model with additive outliers. In order to down-weight the outliers of X-axis, the Mallows' (1973) weight function has been commonly used in the BIRQ estimator. However, in our Monte Carlo study, the BIRQ estimator using the Tukey's bisquare weight function shows less MSE and bias than that of using the Mallows' weight function or Huber's weight function.

• 대한수학회보
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• 제33권2호
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• pp.289-294
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• 1996

The double Gamma function had been defined and studied by Barnes [4], [5], [6] and others in about 1900, not appearing in the tables of the most well-known special functions, cited in the exercise by Whittaker and Waston [25, pp. 264]. Recently this function has been revived according to the study of determinants of Laplacians [8], [11], [15], [16], [19], [20], [22] and [24]. Shintani [21] also uses this function to prove the classical Kronecker limit formula. Its p-adic analytic extension appeared in a formula of Casson Nogues [7] for the p-adic L-functions at the point 0.

• 대한수학회논문집
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• 제31권2호
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• pp.329-342
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• 2016

Motivated essentially by Brychkov's work [1], we evaluate some new integrals involving hypergeometric function and the logarithmic function (including those obtained by Brychkov[1], Choi and Rathie [3]), which are expressed explicitly in terms of Gamma, Psi and Hurwitz zeta functions suitable for numerical computations.