• 한국정보통신학회논문지
• /
• 제21권9호
• /
• pp.1777-1787
• /
• 2017

연합인증은 소속기관에서 이용하는 사용자 ID와 비밀번호를 이용해 타 기관에서 제공하는 연구자원에 접근할 수 있는 멀티도메인 간 사용자 인증 및 인가체계이다. 사용자는 연합인증 서비스에 참여하고 있는 다수의 기관들 중에서 자신의 소속기관을 선택해 로그인해야 한다. 탐색서비스는 연합인증이 가능한 기관들을 목록화해 화면 표시함으로써 사용자가 자신의 소속기관을 쉽게 찾을 수 있게 하는 서비스이다. ID 연합에 참여하는 기관이 증가할수록 소속기관 검색이 어렵기 때문에 탐색시스템에서 참여기관들을 효과적으로 목록화하는 방법이 필요하다. 본 논문은 사용자와 기관의 위치정보를 이용해 근접도를 계산하고 근접도에 따라 기관들의 목록 순서를 결정하는 식별정보제공자 탐색시스템을 제안한다. 또한 탐색시스템의 무중단 서비스를 위한 서버 이중화 방안과 연합인증 서비스의 관리편의성 재고를 위해 서비스현황 모니터링 기능을 구현한다. 마지막으로 개발된 탐색시스템을 연합인증 서비스 환경에 적용하고 제안한 위치정보 기반 탐색, 서버 이중화, 현황 모니터링 방법의 성능과 기능을 검증했다.

• 국제학술발표논문집
• /
• The 3th International Conference on Construction Engineering and Project Management
• /
• pp.869-875
• /
• 2009

Safety is a big issue in the construction sites. For safe and secure management, tracking locations of construction resources such as labors, materials, machineries, vehicles and so on is important. The materials, machineries and vehicles could be controlled by computer, whereas the movement of labors does not have fixed pattern. So, the location and movement of labors need to be monitored continuously for safety. In general, Global Positioning System(GPS) is an opt solution to obtain the location information in outside environments. But it cannot be used for indoor locations as it requires a clear Line-Of-Sight(LOS) to satellites Therefore, indoor location monitoring system could be a convenient alternative for environments such as tunnel and indoor building construction sites. This paper presents a case study to investigate feasibility of Wi-Fi based indoor location monitoring system in construction site. The system is developed by using fingerprint map of gathering Received Signal Strength Indication(RSSI) from each Access Point(AP). The signal information is gathered by Radio Frequency Identification (RFID) tags, which are attached on a helmet of labors to track their locations, and is sent to server computer. Experiments were conducted in a shield tunnel construction site at Guangzhou, China. This study consists of three phases as follows: First, we have a tracking test in entrance area of tunnel construction site. This experiment was performed to find the effective geometry of APs installation. The geometry of APs installation was changed for finding effective locations, and the experiment was performed using one and more tags. Second, APs were separated into two groups, and they were connected with LAN cable in tunnel construction site. The purpose of this experiment was to check the validity of group separating strategy. One group was installed around the entrance and the other one was installed inside the tunnel. Finally, we installed the system inner area of tunnel, boring machine area, and checked the performance with varying conditions (the presence of obstacles such as train, worker, and so on). Accuracy of this study was calculated from the data, which was collected at some known points. Experimental results showed that WiFi-based indoor location system has a level of accuracy of a few meters in tunnel construction site. From the results, it is inferred that the location tracking system can track the approximate location of labors in the construction site. It is able to alert the labors when they are closer to dangerous zones like poisonous region or cave-in..