• 한국시뮬레이션학회논문지
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• 제20권3호
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• pp.69-78
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• 2011

대규모 센서 네트워크를 구성하는 센서 노드는 개방된 무인 환경에서 동작한다. 악의적인 공격자는 일부 센서 노드를 탈취 하여 허위 보고서를 주입할 수 있다. 통계적 여과 기법은 이러한 허위 보고서 주입 공격에 대응하기 위한 기법으로 보고서 전달 과정 중에 허위 보고서를 검출하고 여과할 수 있는 방법을 제안하였다. 통계적 여과 기법에서는 적절한 전달 경로 설정을 통하여 허위 보고서 검출 성능 향상뿐만 아니라 에너지 효율 또한 높일 수 있다. 하지만 네트워크의 위상 변화와 노드의 에너지고갈 등의 다양한 환경 변화로 인하여 전달 경로를 재설정해야 하는 경우가 빈번히 발생한다. 빈번한 경로 재설정은 과도한 에너지 소모를 유발하므로 적절한 경로 재설정 주기를 결정하는 것은 매우 중요하다. 본 논문에서는 센서 네트워크의 제안된 에너지를 효율적으로 사용하기 위한 영역별 경로 재설정 주기 결정 기법을 제안한다. 제안 기법은 퍼지 시스템을 이용해 각 영역의 경로 재설정 주기를 동적으로 결정한다. 또한 주기가 결정된 영역에 대해 적절한 보안 수준을 결정하고 해당 영역은 이를 적용하여 경로를 재설정한다. 시뮬레이션을 통하여 제안 기법이 경로 재설정에 사용되는 에너지 소모량을 최대 50% 이상 감소시켰음을 확인하였다.

• Spatial Information Research
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• 제22권4호
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• pp.67-76
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• 2014

최근 IT, 모바일 기술의 발전으로 공간정보는 국민생활과 국가경제의 인프라 역할을 수행하고 있으며, SNS 소셜커머스를 비롯한 많은 어플리케이션에서 공간정보를 활용하여 다양한 서비스를 제공하고 있다. 이와 관련하여 국가 공간정보 서비스를 안정적으로 제공할 수 있는 공간정보 오픈플랫폼 서비스(VWorld)의 등장에 사람들의 관심이 크게 증가하고 있다. 그러나 현재 공간정보 오픈플랫폼 시스템은 실시간 모니터링 시스템이 도입되지 않은 상태로 오픈플랫폼의 실시간 부하 및 사용 현황을 파악하는데 많은 어려움이 있다. 이에 본 연구에서는 오픈플랫폼 시스템의 웹 사용자로그정보를 이용하여 데이터 전송량, 네트워크 점유율, 서비스 방문자 수, Hit 건수, 접속 경로, 주요 이용 콘텐츠와 관련된 사용현황을 분석하고 그 결과를 제시하고자 한다. 본 연구에서 제시한 결과가 오픈플랫폼 서비스의 모든 사용 현황을 파악하기에는 부족한 면이 있지만, 해마다 변화하는 오픈플랫폼의 사용현황을 파악하기 위한 기본 자료로, 또한 오픈플랫폼 시스템 확장에 있어서의 기초자료로서 활용이 가능할 것으로 기대된다.

• 한국사회복지학
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• 제63권2호
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• pp.57-79
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• 2011

본 논문은 최근 한국사회에서 논란이 되고 있는 보편주의 복지정책에 대한 몇 가지 쟁점들을 검토함으로써 향후 보편주의 복지를 둘러싼 논의의 토대를 제공했다. 일반적 이해와 달리 보편주의와 선별주의는 대립적인 정책원리가 아닌 상호보완적인 정책원리이며, 보편주의 복지는 선별주의 원리를 통해 보완되어야 한다고 주장했다. 또한 보편주의는 사민주의와 같은 특정 정치이념의 산물이기 보다는 해당 사회의 공통에 위험에 대한 사회적 연대의 산물이라는 점을 제시했다. 한국사회에 주는 시사점으로 는 단순히 산업화된 서구 복지국가에서의 보편주의 복지의 궤적을 쫓아가기보다는 현재 한국사회가 직면한 현실에 근거해 보편주의 복지에 대한 새로운 할당원리를 고민해야한다는 과제를 던지고 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 A
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• pp.87-89
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• 2002

This paper presents a new approach using an Improved branch exchange (IBE) technique to maximize the voltage stability as well as loss minimization in radial power systems. A suitable voltage stability index (VSI) for optimal routing algorithm is developed using novel methods both a critical transmission path based on a voltage phasor approach and an equivalent impedance method. Furthermore, the proposed algorithm can automatically detect the critical transmission path to be reached to a critical load faced with voltage collapse due to additional real or reactive leading. To develop an effective optimization technique, we also have applied a branch exchange algorithm based on a newly derived index of loss change. The proposed IBE algorithm for VSI maximization can effectively search the optimal topological structures of distribution feeders by changing the open/closed states of the sectionalizing and tie switches. The proposed algorithm has been tested with the various radial power systems to show its favorable performance.

• 대한가정학회지
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• 제41권8호
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• pp.139-158
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• 2003

This study investigated the effects of Korean parents' family-of-origin experiences, marital conflict, open or dysfunctional communication with their children, children's coping behaviors on their behavior problems as a function of a child's sex. Theoretical models for both sexes were constructed based on the results. Two hundred and nine boys and one hundred and ninety six girls of 4th and 5th grades from two elementary schools filled out the questionnaires to assess their communication with the parents, their problem-focused coping behaviors, and their internalizing and externalizing behavior problems. Four hundred five parents of these children answered the questionnaires to assess differentiation for the family-of-origin and the marital conflict. The results were as follows. Boys' path pattern showed that the fathers' differentiation from the family-of-origin effected their sons' internalizing and externalizing behavior problems through parent-child dysfunctional communication. Girls' path exhibited two different patterns. One is that the mothers' differentiation from the family-of-origin effected their daughters' internalizing and externalizing behavior problems through parent-child dysfunctional communication. Another one is that the mothers' differentiation from the family-of-origin influenced children's internalizing behavior problems through daughters' problem-focused coping behaviors as well as parent-child dysfunctional communication.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1996년도 춘계학술발표회논문집(2)
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• pp.622-627
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• 1996

Detailed analysis of Feedwater Line Break (FLB) event for the fuel failure point of view are lack because the event was characterized as the increase in reactor coolant system (RCS) pressure. Up to now, the potential of the rapid system heatup case has been emphasized and comprehensively studied. The cooldown effects of FLB event is considered to be bounded by the Steam Line Break (SLB) event since the cooldown effect of SLB event is larger than that of the FLB event. This analysis provides a new possible path which can cause the fuel failure. The new path means that the fuel failure can occur under the heatup scenario because the Pressurizer Safety Valves (PSVs) open before the reactor trips. The 1000 MWe typical C-E plant FLB event assuming Loss of Offsite Power (LOOP) at the turbine trip has been analyzed as an example and the results show less than 1% of the fuel failure. The result is well within the acceptance criteria. In addition to that, a study was accomplished to prevent the fuel failure for the heatup scenario case as an example. It is found that giving the proper pressure gap between High Pressurizer Pressure Trip (HPPT) analysis setpoint and the minimum PSV opening pressure could prevent the fuel failure.

• 대한가정학회지
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• 제42권5호
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• pp.127-143
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• 2004

This study examined the direct and indirect influences of adolescents' self-esteem, impulsiveness, departments of school, perceived communications with mothers and peer support on internet-related delinquencies. The study consisted of 555 second-year students from a vocational, academic oriented girl's high schools that were located in Busan. Data analysis was made through Two-Way ANOVA, Pearson's Correlation, Multiple Regression, and Path Analysis by using SPSS WIN 10.0. The results of this study is described as follows. First, internet-related delinquencies were committed by male students more than by female students. Second, problematic communications with mothers was most directly influenced by internet-related delinquencies of high school students of both sexes and was indirectly influenced by self-esteem and impulsiveness. Third, impulsiveness was directly influenced by internet-related delinquencies in both male and female students. In male students, their school departments indirectly influenced internet-related delinquencies by way of open communication with mothers, peer support, self-esteem, and impulsiveness. In female students, school departments directly influenced on internet-related delinquencies and indirectly by way of peer support, self-esteem and impulsiveness. Internet-related delinquencies by male and female students were not directly influenced by peer support and self-esteem. But peer support did have indirect effects on internet-related delinquencies by way of self-esteem and impulsiveness, and self-esteem also had indirect effects by way of impulsiveness.

• The Journal of Asian Finance, Economics and Business
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• 제7권9호
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• pp.517-526
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• 2020

This research investigates the relationship among product quality, service quality, perceived value, customer satisfaction, and behavior intentions. Validated measurements were identified from a literature review. The measurement model and the conceptual model depicting hypothesized relationships were evaluated based on responses from 220 customers using confirmatory factor analysis and structural equation modeling. The testing results show that, for the direct path, product quality has a significant, positive influence on customer satisfaction, and behavioral intentions. Also, perceived value directly influences customer satisfaction and behavioral intentions and satisfaction is an antecedent of behavioral intentions. For the indirect path, service quality has a significant, positive influence on behavioral intentions through the customer satisfaction. The major finding of this study suggest that service quality easily attract more customers, especially the young consumers. About the sale personnel, communication skills, knowledge and ways of treatment to customers are crucial to retailers to gain competitive advantage over competitors. Therefore, it should have clear and consistent processes, procedures with criteria that create the best condition for organization and individual to open this kind of retailing store. Furthermore, product quality improvement is essential; all products must have clear originality; and diversifying products and services is also the way to appeal more consumers.

• 전산구조공학
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• 제9권3호
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• pp.209-216
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• 1996

본 논문의 목적은 단층래티스 돔의 안정해석 기법을 제안하고, 다양한 조건하에서 단층 래티스 돔이 갖는 좌굴특성을 규명하는데 있다. 기하학적 비선형 평형경로의 탐색 및 좌굴점 그리고 분기경로의 방향 등을 수직적으로 계산하기 위하여 호장법(Arc-Length Method)을 이용하였으며, 부재의 좌굴가능성을 판단하기 위하여 에너지밀도함수를 제안하였다. 강절점을 갖는 구조물의 거동 특성을 규명하기 위하여 3종류의 비선형 강성행렬을 유도하여 해석하였으며, semi-rigid절점을 갖는 구조물을 해석하기 위하여 스프링모델을 제안하고, 부재의 세장비, 반개각, 경계조건 및 다양한 하중조건을 파라메터로하여 좌굴특성을 규명하였다.

• 한국실내디자인학회논문집
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• 제39호
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• pp.83-91
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• 2003

The planning of circulation area and circulation path are very important elements for layout of interior space of housing. This study is, therefore, aimed at synthetical review of that area from a functional, structural and socio-cultural point of view as well as typological analysis of that area. In the interior space of housing the networking of spaces according to the circulation route imply divers aspects of independent or dependant significances. It is thus, closely related with to whether circulation area open or closed, whether circulation path concentrated or distributed, and whether it passes Individual rooms or not. With regard to relationship with public and private spaces, there are many grounds for combining each other. This study also tried to develope program for planning of circulation system, utilizing typological analysis of them. At the same time this study suggests examples for layout of housing spaces. It is expected that the results represented In the form of systematic diagram will deserve to be a tool for providing an appropriate solution to the problem of diversity of user's needs.