• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.4
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• pp.87-93
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• 2016

In this paper, we propose a RF energy harvesting based routing protocol in mobile ad-hoc wireless sensor networks. The main features and contributions of the proposed routing protocol are as follows. First, establishment of routing route based on both remaining energy of mobile sensor nodes and RF energy harvesting. Second, establishment of routing route by considering availability and stability of route based on energy of mobile sensor nodes to increase lifetime of networks and route. The performance evaluation of the proposed routing protocol using OPNET shows that the routing method considering both route availability and route stability based on RF energy harvesting can increase efficiently route lifetime.

• 한국ITS학회:학술대회논문집
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• v.2007 no.10
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• pp.35-41
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• 2007

• Journal of the Korea Society of Computer and Information
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• v.13 no.2
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• pp.243-250
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• 2008

The coverage algorithm based on Boustrophedon path has been known to be the most efficient in places without or less obstacles If the map of an environmental area thru SLAM algorithm can be obtainable. However, the efficiency of the coverage algorithm based on Boustrophedon path drops drastically when obstacles are complex. In this paper, we propose and implement a new algorithm, which we call Group-k, that efficiently handles the complex area. The Group-k algorithm groups the obstacles and prioritizes the covering sequences with complex rank of the groups. Implementation-based experiments show about 20% improved performance when applying the nor- algorithm, compared to the Boustrophedon path algorithm.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.3
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• pp.61-67
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• 2008

Proxy MIPv6 (PMIPv6) is that network-based mobility management protocol that network supports mobile node's mobility on behalf of the MN. In PMIPv6, when two MNs located within the same PMIPv6 domain want to communicate each other, sub-optimal path is established between the two MN. Route optimization method for PMIPv6 is proposed to resolve the problem. However, the method still suffer from the performance degradation due to out-of-sequence packet problem. In this paper, we propose the route optimization mechanism in PMIPv6 based on Flush message to resolve the out-of-sequence packet problem. The proposed mechanism is evaluated by performing simulations, and the simulation results show that the proposed one gives better performance.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.555-556
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• 2023

본 논문에서는 제조/물류 기업 등 제품(물품) 이동 작업 시 효율적인 경로 제공을 위한 경로 최적화 기법을 제안한다. 이 기법은 업무지원 시스템(MES, ERP, WMS 등)이 구축되어있는 기업을 대상으로 공간정보와 업무지원 시스템에 저장되는 제품 데이터를 기준 정보로 하며, 다익스트라(Dijkstra), 개미 집단 알고리즘(Ant Colony Algorithm, ACO)등 경로 탐색 알고리즘을 적용하여 문제를 해결하고자 한다. 공간정보는 공장(현장)의 레이아웃(Layout)과 제품이 적재/출하되는 렉(Rack) 등의 위치 정보가 포함되고, 업무지원 시스템에서 제품의 현재 위치, 공정 상태, 등록 시간, 제품 크기 등을 사용한다. 제안하는 기법은 상기 기준 정보를 경로 탐색 알고리즘에 적용하여 적재/출하, 공정 이동, 보관 장소 변경 등 제품의 위치가 변경되는 경우에 경로를 최적화할 수 있는 기법을 제안한다. 제품 이동 작업은 대부분 노동력에 의존하는 작업으로 경로 최적화 기법을 제안함으로써, 인력 비용 감소와 향후 로봇 기반의 제품 이동 작업에도 적용하여 자동화된 작업효과를 가져다 줄 것으로 기대한다.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.1
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• pp.149-157
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• 2013

This paper describes a global path planning method and path optimization algorithm for autonomous mobile robot based on the virtual elastic force in a grid map environment. A goal of a path planning is information for a robot to go its goal point from start point by a effective way. The AStar algorithm is a well-known method for a grid based path planning. This paper suggest a path optimization method by a virtual elastic force and compare the algorithm with a orignal AStar method. The virtual elastic force makes a shorter and smoother path. It is a profitable algorithm to optimize a path in a grid environment.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10b
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• pp.112-114
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• 2004

오늘날 웹을 이용하는 사용자들의 웹 검색 형태를 저장한 웹 로그 데이터들은 데이터 마이닝을 위한 중요한 자료가 되고 있다. 이들 웹 로그들로부터 사용자의 현재 행동을 기반으로 사용자가 다음에 요청할 요구를 예측할 수 있는 예측 모델을 만들 수 있다. 하지만 이들 웹 로그들은 크기가 매우 크고 분석하기가 어렵다. 이런 문제를 해결하기 위해 이미 않은 방법이 제안되었다. 그 중에서 효과적으로 예측할 수 있도록 제안된 순차적 분류 기반에 연관법칙을 적용한 예측 기법이 있다. 본 논문에서는 전방향 참조 경로 탐사 패턴 알고리즘을 적용하여 연관규칙에 기반 한 웹 문서 예측 기법을 향상시키는 모델을 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.751-753
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• 2001

정보보호 분야의 핵심 기술인 PKI는 전자정부 및 전자상거래 전반의 응용 환경에서 정보보호의 기반구조로서 그 활용의 폭을 더욱 넓혀가고 있으며, 현재 유선 인터넷 환경을 기반으로 구성되어진 PKI는 무선 인터넷 환경의 정보보호 기반구조로 그 영역을 더욱 확장해 나가고 있다. 본 논문은 이러한 PKI에 필수적인 요소인 인증 경로 검증에 효율적으로 대응하고 확장성을 지원하기 위하여 Collaborative ETRI VA를 제안하였다. ETRI VA는 클라이언트의 인증 경로 검증에 대한 부담을 줄이고, 신뢰 모델에 영향을 받지 않고 검증을 수행하며, 중앙집중적으로 신속하게 정책을 반영할 수 있게 한다.

• KIISE Transactions on Computing Practices
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• v.23 no.2
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• pp.116-121
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• 2017

In wireless sensor networks, the multipath prefers energy efficient routing method due to the characteristic of low-power sensor which uses geographic method to transmit data packet through information of the neighbor nodes. However, when multipath meets the routing fail area called hole area, path overlap problem can occur, resulting in failed maintenance of disjoint multipath. To solve this problem, multipath research studies have been performed to exploit the modeling and detouring method in routing fail area by keeping the disjoint multipath. However, in an energy point of view, additional method like modeling can lead to a lot of energy consumption of sensor node. Moreover, lots of energy consumption of sensor node can shorten the life span of sensor network. In this study, we proposed an energy efficient geographic routing by keeping the disjoint multipath in routing fail area. The proposed scheme exploited the face routing using the geographic recovery method without additional method like modeling.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.758-762
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• 2008

As development of IT technology, Interest of Green building has been increasing rapidly. Because the construction industry is on the center of Green development, Green construction management is demanded for efficient analysis solution of building performance. BIM has a object-oriented parametric modeling technology. IT, which green building's performance management and analysis, is very useful. A green building certification is essential course in the green building construction. So this Paper suggest him based green building simulation system. The him based green building simulation system will support resonable decision making on the early construction phase.