• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2003년도 추계학술발표논문집 (상)
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• pp.447-450
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• 2003

지방자치단체 업무를 지원하기 위해 구축된 지리정보 활용 시스템을 UIS (Urban Information System : 도시정보시스템)라 한다. 본 논문은 각 지방자치단체가 많은 비용을 투자하여 개발한 UIS 활용을 극대화하기 위해 지방자치단체의 현장업무 중심의 UIS에 GPS와 PDA을 결합한 LBS(Location-Based Service:위치기반서비스) 시스템을 제시한다. 본 연구에서 제시된 시스템을 개발하여 활용한다면 현재 UIS의 가장 큰 문제점인 데이터베이스 유지보수 비용을 절감할 것이라 기대된다.

• 대한지리학회:학술대회논문집
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• 대한지리학회 2004년도 춘계학술대회
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• pp.77-77
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• 2004

본 연구는 "왜 성형외과가 강남구에 밀집분포하고 있는가？" 라는 문제의식에서 출발하여, 강남구 성형외과의 의료공급자의 입지요인과 의료소비자의 방문요인에 대하여 알아보고 양측의 상호연관성에 대해 고찰해 보고자 하였다. 연구방법으로는 문헌연구, 통계자료 분석, 강남구 성형외과 개원의와 내원객에 대한 설문조사와 심층 인터뷰, 대중매체의 기사 검색 등을 통해 이루어졌다. (중략)루어졌다. (중략)

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2004년도 춘계공동학술대회 논문집
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• pp.27-30
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• 2004

최근의 IT기술의 발전과 더불어 지형 정보시스템(GIS, Geographical Information System)이 급격하게 발전되고 있으며 이를 이용한 위치기반의 물류시스템의 새로운 분야를 이루고 있다. 본 연구는 이러한 GIS를 이용하여 3차원의 지형정보를 구현하고 지금까지의 고려하지 못하였던 3차원 위치기반의 거리산정과 이를 물류시스템의 여러 분야에 활용할 수 있도록 SW를 개발하였다. 특히 본 연구에서는 물류시스템의 새로운 패러다임의 변화와 위치기반의 물류시스템의 예로 2차원의 GIS를 3차원의 GIS로 변환하였으며, 이를 3차원 거리산정하고, 이를 1) 거리산정모델, 및 2) 차량 운송계획 모델을 개발하고 이를 위한 SW를 개발하였으며 실제 물류시스템계획 문제에 응용한 사례를 보였다. 본 연구는 추후 보완 연구될 경우 실용적인 물류시스템의 방법으로 활용될 수 있을 것이다.

• Journal of Communications and Networks
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• 제7권4호
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• pp.417-428
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• 2005

The Voronoi diagram (VD) is the most suitable mechanism to find the nearest neighbor (NN) for mobile clients. In NN query processing, it is important to reduce the query response time, since a late query response may contain out-of-date information. In this paper, we study the issue of location dependent information services (LDISs) using a VD. To begin our study, we first introduce a broadcast-based spatial query processing methods designed to support NN query processing. In further sections, we introduce a generic method for location-dependent sequential prefetching and caching. The performance of this scheme is studied in different simulated environments. The core contribution of this research resides in our analytical proof and experimental results.

• 대한임베디드공학회논문지
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• 제14권3호
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• pp.113-121
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• 2019

Algorithms for geographical routing and location update attract the researchers' interests in wireless ad hoc networks. Even though many various schemes have been proposed, most of them cause scalability problem in small groups of nodes. To defeat this problem, flooding algorithm is widely utilized due to low complexity. However, there is no previous research work to evaluate flooding algorithm through implementation instead of simulation. In this paper, we present implementation of flooding algorithm on Raspberry Pi and performance evaluation results.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2004년도 춘계학술발표대회
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• pp.1529-1532
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• 2004

A Mobile Ad Hoc NETwork (MANET) is a collection of wireless mobile nodes that forms a temporary network without the need for any existing network infrastructure or centralized administration. Therefore, such a network is designed to operate in a highly dynamic environment due to node mobility. In mobile ad hoc network, frequent topological changes cause routing a challenging problem and without the complete view of the network topology, establishing the shortest path from the source node to the destination node is difficult. In this paper, we suggest a routing approach which utilizes location information to setup the shortest possible path between the source node and the destination node. Location information is obtained through Global Positioning System (GPS) and this geographical coordinate information of the destination node is used by the source node and intermediate nodes receiving route request messages to determine the shortest path to the destination from current node.

• 정보보호학회논문지
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• 제17권4호
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• pp.21-35
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• 2007

애드혹(Ad hoc) 네트워크에서의 위치기반 라우팅(position-based routing)은 노드의 지리적인 위치정보를 이용함으로써 효율적인 라우팅이 가능하다는 장점이 있다. 위치기반 라우팅에서 위치 서비스(location service)는 라우팅의 안전성과 효율성에 있어서 매우 중요한 부분이다. 본 논문에서는 위치 서비스에서 발생할 수 있는 보안 위협을 정의하여 기존 애드혹 라우팅에서의 보안 위협뿐 아니라 위치 서비스에서의 보안 위협에도 안전한 쿼럼기반 위치 서비스 프로토콜을 제안한다. 제안하는 프로토콜에서 노드는 공격 노드에 의한 거짓 위치 갱신, 거짓 위치 응답 공격에 대응하기 위해 스스로 생성한 공개키/개인키 쌍과 자신의 위치정보를 이용하여 주소를 생성하며 이를 위치기반 라우팅에 사용한다. 본 논문에서는 제안하는 프로토콜이 기존에 존재했던 다양한 공격들에 대해 안전하며 위치 서비스를 대상으로 한 공격에도 안전하게 대응할 수 있음을 보였고 시뮬레이션을 통해 프로토콜의 안전성 및 효율성을 분석하였다.

• Journal of Communications and Networks
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• 제8권1호
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• pp.49-58
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• 2006

One of the first decisions that a radio network designer must take is the location of base stations and the distance between them in order to give the best coverage to a region and, possibly, to reduce deployment costs. In this paper, the authors give an insight to this matter by presenting a possible solution to a real problem: Planning the base stations layout for a universal mobile telecommunications system (UMTS) in the city of Barcelona. At the basis of this problem, there is the interdependence between coverage and capacity in a wideband-code division multiple access (W-CDMA) system, which is a new element in the planning of BS layout for mobile communications. This aspect has been first treated with an analytical study of the cell coverage range for a specific environment and service. The achieved results have been checked with the help of snapshot simulations together with a geographical information system (GIS) tool incorporated in the simulator that allows to perform analysis and to visualize results in a useful way. By using the simulator, it is also possible to study a more complex environment, that of a set of base stations providing multiple services to a large number of users.

• 한국농촌건축학회논문집
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• 제12권2호
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• pp.135-142
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• 2010

This research aims to examine the characteristics of tomb sites including tomb mound and attached buildings and also to find out the principles reflected in the traditional oriental Feng-Shui location and spatial composition of Junkyung and Youngkyung tomb at Samcheok. The results of this study are as follows. These tombs harmonize with each other in the cosmic dual forces because Junkyung tomb is men's sex symbol and tiger to lie on his belly and Youngkyung tomb is women's sex symbol in geographical feature. Spatial structure in these tomb sites were placed in a reflected line following the hierarchy of metaphysics by standing high Geumchunkyo(Bridge)-Hongsalmun(Gate)-Jegak(Pavilion)-Bongbun(Tomb mound). Axis structure of these tombs is irregular bent-axis type from Geumchunkyo to Bongbun, specially in case of Youngkyung tomb it is getting more refractive. These tombs are divided into and characterized by three zones. Firstly the space for living people constitutes from Geumchunkyo to Hongsalmun, secondly the semi-sacred space constitutes from Hongsalmun to Jegak, and lastly the space for the dead constitutes from the back of Jegak to Bongbun. - type Jegak instead of T type Jegak generally used at Chosun Dynasty was installed because of claypan stretched out in front of Junkyung tomb and Bongbun of Youngkyung tomb located at a ravine between two mountain ranges.

• 한국농촌건축학회논문집
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• 제17권2호
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• pp.17-26
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• 2015

In this study the location condition and the management of the Rural Experience Tourism Villages located around unified Cheongju city has been surveyed or investigated. On the basis of the results of the survey or investigation this study is to suggest a way to make activate the Rural Experience Tourism Villages which have been inactive. The ways of the research include the understanding of what means the activation of rural areas and then this study is to find the problems with the Rural Experience Tourism Villages and to suggest final ways or plans after the field investigation of the condition of the location and management of the Villages. In this study I had full understanding of the concept of the activation for rural areas and the humanistic and geographical characteristics and then made a wide investigation and analysis of the location condition and the management of the Rural Experience Tourism Villages in this area. Based on the theory and the results of the actual investigation I made a suggestion of basic direction for the improvement of the Villages and the ways for activation of the Villages. I really expect these suggestions of mine to make active contribution to make the actual plan through the promotion of the Rural Experience Tourism Villages.