• International Journal of Fuzzy Logic and Intelligent Systems
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• 제7권2호
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• pp.127-131
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• 2007

The control of electrical appliances residing in the home network can be accomplished via Internet with the UPnP expansion without modifying an existing UPnP. In this paper, we propose the Internet Gateway that consists of an UPnP IGD(Internet Gateway Device) DCP(Device Control Protocol) and an UPnP Bridge as a system to control electrical appliances of home network. UPnP IGD DCP is to enable the configurable initiation and sharing of Internet connections as well as assuring advanced connection-management features and management of host configuration service. It also supports transparent Internet access by non-UPnP-certified devices. UPnP Bridge searches for local home network devices by sending control messages, while control point of UPnP Bridge looks up devices of interest on the Internet, subsequently furnishing the inter-networking controlling among devices which belong to different home network systems. With our approach, devices on one home network can control home electrical appliances on the other home network via Internet through IGD DCP with control commands of UPnP.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2002년도 춘계종합학술대회
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• pp.90-95
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• 2002

본 논문에서는 보다 적은 Network 자원의 사용으로 높은 서비스 품질을 보장할 수 있는 원격 화상 강의 시스템을 분석하고 구현한다. 기존의 화상강의 시스템의 대부분은 다자간 회의 방식이 아닌 점대점방식으로 설계되어 있다. 그러나 현재와 앞으로의 원격 화상 강의 시스템은 다자간의 화상 강의 시스템으로서의 화장과 사용자에 대해 높은 서비스 품질이 보장되어질 것이 요구되고 있다. 이런 문제를 해결하기 위해 Network 대역폭의 증가와 더불어 Network 차원의 멀티캐스트 전송기술이 적용되어야 하고, 고성능의 진보된 압축기술이 화상회의 시스템에 적용되어져야 한다. 본 논문에서 제안한 시스템은 차세대 인터넷이 초고속 Network라는 특성을 기반으로 대중화될 원격 화상 강의 시스템으로써 하나의 응용서비스를 제공한다.

• 한국IT서비스학회지
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• 제11권2호
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• pp.319-337
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• 2012

To stress the importance of privacy in social networking, I presented an analysis on how information control and information management vulnerability influence trust and privacy concerns in social networking, and how trust and privacy concerns influence the sustainable usage intention of social network services. I also analyzed the factors affecting privacy concerns to present the method to alleviate social network users' concerns about privacy. Information collection control, information processing control and information management vulnerability were chosen and analyzed as the factors affecting privacy concerns. The results showed that information collection control and information management vulnerability significantly affected trust and privacy concerns; and information processing control did not significantly affect privacy concerns. The relationship between trust and privacy concerns, and sustainable usage intention was statistically significant; and the relationship between trust and expansion of communication channels was also statistically significant.

• 산업경영시스템학회지
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• 제33권2호
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• pp.81-88
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• 2010

This paper presents an application of heuristic approach to problem of designing reliable network expansion. The problem essentially consists in finding the network topology that satisfies given set of reliability constraints. To efficiently solve the problem, a scatter search approach is proposed. The results of the two experiments show that scatter search is a more suitable approach for finding a good solution or near optimal solution in comparison with genetic algorithm.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.63-66
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• 2015

스마트폰의 대중화에 따라 무선 데이터 트래픽이 기하급수적으로 증가하고 있으며, 이러한 데이터 트래픽을 원활히 수용하기 위하여 차세대 이동통신 네트워크에 대한 연구가 활발히 진행 중이다. 특히, 매크로 셀과 소형 셀을 활용하여 공간 재활용성을 높임으로써 네트워크 용량을 획기적으로 개선할 수 있는 이종 이동 통신망이 많은 관심을 끌고 있다. 이종 이동 통신망에서는 매크로 기지국과 소형 기지국 간의 송신전력의 차이로 인하여 부하 불균형과 간섭 등의 문제가 발생하며, 이를 해결하기 위하여 cell range expansion (CRE) 기술을 활용한다. 본 논문에서는, 초밀집 이종 이동 통신망에서 CRE bias를 적응적으로 적용하는 새로운 셀 선택 방식을 제안하고 시스템 레벨 시뮬레이션을 통하여 셀 평균 전송률을 분석하고, 기존의 셀 선택 방식과 비교 한다.

• 한국전기전자재료학회논문지
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• 제36권6호
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• pp.603-608
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• 2023

Carbon black with high purity and excellent conductivity is used as a conductive filler in the semiconductive compound for EHV (Extra High Voltage) power cables of 345 kV or higher. When carbon black and CNT (carbon nanotube) are applied together as a conductive filler of a semiconductive compound, stable electrical properties of the semiconductive compound can be maintained even though the amount of conductive filler is significantly reduced. In EHV power cables, since the semi-conductive layer is close to the conductor, stable electrical characteristics are required even under high-temperature conditions caused by heat generated from the conductor. In this study, the theoretical principle that a semiconductive compound applied with carbon black and CNT can maintain excellent electrical properties even under high-temperature conditions was studied. Basically, the conductive fillers dispersed in the matrix form an electrical network. The base polymer and the matrix of the composite, expands by heat under high temperature conditions. Because of this, the electrical network connected by the conductive fillers is weakened. In particular, since the conductive filler has high thermal conductivity, the semiconductive compound causes more thermal expansion. Therefore, the effect of CNT as a conductive filler on the thermal conductivity, thermal expansion coefficient, and volume resistivity of the semiconductive compound was studied. From this result, thermal expansion and composition of the electrical network under high temperature conditions are explained.

• 경영과학
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• 제20권1호
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• pp.65-76
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• 2003

The increased environmental concerns and the emphasis on recycling are gradually shifting the orientation of municipal solid waste (MSW) management. This paper is designed to evaluate regionalization programs for MSW management system. We developed a mixed intiger network programming (MIP) model to identify environment-friendly, cost-effective expansion plans for regionalization scenarios considered. The MIP model is a dynamic capacity expansion model based on the network flow model that depicts the MSW management cycle. In particular, our model is designed to determine the optimal form of regionalization using binary variables. We apply this model to assess the regionalization program of Seoul Metropolitan City, which includes three scenarios such as 1) districting, 2) regionalization with neighboring self-governing districts, and 3) g1obalization with all districts. We demonstrate how our model can be used to plan the MSW system. The results indicate that optimal regionalization with nearby self-governing districts can eliminate unnecessary landfills and expansions if jurisdictional obstacles are removed.

• 한국컴퓨터정보학회논문지
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• 제24권10호
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• pp.25-32
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• 2019

본 논문에서는 보호대상 서버 네트워크에 디코이 트랩을 통한 공격 표면 확장의 적용 방법을 제안한다. 보호대상 서버 네트워크는 많은 수의 디코이들과 보호대상 서버로 구성되며, 각 보호대상 서버는 Hidden Tunner Networking이라는 네트워크 기반 이동 표적 방어 기법에 따라 IP 주소와 포트 번호를 변이한다. 이동 표적 방어는 공격을 막기 위하여 지속적으로 시스템의 공격 표면을 변경하는 사이버 보안에서의 새로운 접근방법이다. 공격 표면 확장은 공격을 막기 위해 디코이와 디코이 그룹을 활용하는 접근방법이다. 제안하는 방법에서는 공격자가 디코이 트랩에서 공격자의 모든 시간과 노력을 허비하도록 커스텀 체인과 RETURN 타켓을 사용하여 보호대상 서버의 NAT 테이블을 수정한다. 본 논문에서는 제안하는 방법이 적용되기 전과 후에 보호대상 서버 네트워크에서의 공격자 성공률을 수식으로 계산한다. 제안하는 방법은 보호대상 서버가 공격자에 의해 식별되고 공격당할 확률을 현저히 줄일 것으로 기대된다.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2007년도 학술대회
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• pp.117-120
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• 2007

This article describes a definition of next generation access network, and introduces the researches about a candidate optical links for the next generation access network, and a trend of standardization of Next Generation Access (NGA). Expansion in reaches of access network enables to the evolutions to the metro-access union system. Also, this paper reviews the access network in Korea, and suggests the requirements for the system in NGA.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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• pp.350-353
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• 2001

This study proposes a new method for the transmission system expansion planning using the fuzzy integer programming. It presents stepwise cost characteristics analysis which is a practical condition of an actual systems. A branch and bound method which includes the network flow method and the maximum flow-minimum cut set theorem has been used in order to proceed the stepwise cost characteristics analysis. Uncertainties of the permission of the construction cost and not strict reserve rate and load forecasting of expansion planning have been included and also processed using fuzzy set theory in this study. In order to proceed the latter analysis, the solving procedure is illustrated in detail by branch and bound method which includes the network flow method and maximum flow-minimum cut set theorem. Finally, case studies on 21-bus test system show that the algorithm proposed is efficiently applicable to the practical expansion planning of transmission systems in future.