• Journal of information and communication convergence engineering
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• 제3권2호
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• pp.80-83
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• 2005

At present, GML becomes the global standard for the XML encoding of geographic information and is the foundation for the Geo-Web. GML is being applied to a wide range of geographic applications including GIS and location-based services, telematics and intelligent transportation systems. In this paper, we propose the tourism information system for supporting the location based service application. We made an effort to design and implement a GIS computing environment by thin client for mobile web mapping service. We are interested in the GML applications that include traditional GIS system for navigation service and location finder for points of interest (POI) services. This paper summarizes the Tourism information system for location based service of a small area (Han-Ok Village with the Korean traditional houses in Jeonju-city), in which moving travelers can obtain proper information services at the current location associated with traditional monuments, cultural products, food, and conveniences. In the paper, we report on the design of the thin client/server system for a mobile environment. This paper is divided into three parts. First, we give a general overview of the organization of the system and of the important concerns of our design. Second we focus on our system supports for location and POI determination, and design concerns. Finally, we show the graphic user interface of PDA, the procedures involved in the service, and the executed results.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 춘계 학술논문 발표대회
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• pp.239-240
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• 2016

The nuclear power plant construction project is a large-scale project that involved a daily maximum of thousands of workers. many equipment and laborers involved has been required consistently to minimize the need for safety through real-time safety management. But current nuclear power plant construction site is only managed to access of workers and equipments. The purpose of this study is the owner requirements reflects the characteristics of the nuclear power plant construction project integrated safety management system utilizing active RFID and GPS positioning technology.

• 한국전자통신학회논문지
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• 제14권3호
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• pp.601-606
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• 2019

렌티큘러 위치기반 시스템은 지상 및 실외중심의 지역, 건물, 선박, 지하 등 실내에 있는 사용자가 스스로 자신의 위치를 실시간으로 알릴 수 있는 위치정보 기술이다. 본 논문에서는 이전의 실내 위치 인식기술의 한계성과 문제점을 분석하고, 이용자 중심의 위치서비스 방법을 제안한다. 제안된 방법은 렌티큘러 스티커, 데이터베이스(DB) 수집 및 분석기술, 측위시스템으로 구성되어 있고, 측위오차기반 서비스를 실행하기 위한 기반 인프라로 활용될 수 있을 것이며, 실내 렌티큘러를 이용한 위치기반시스템 개발을 통하여 사용자 중심의 측위 정확도 향상뿐만 아니라, 각종 재난안전 상황에서 신속한 구조활동에 사용자 중심의 위치기반 시스템으로 활용할 수 있을 것이다.

• 한국통신학회논문지
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• 제38C권2호
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• pp.181-188
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• 2013

본 논문은 GPS 신호를 수신할 수 없는 대형선박의 내부에서 현재 위치를 정확하게 측정하기 위해서, GPS 신호를 대신하여 선박내부에 설치되어 있는 Wireless AP (Access Point)에서 발신되는 RSSI (Received signal strength indication)를 이용하였다. 선박내부에서 수신되는 RSSI 신호 중 신호세기가 가장 강한 3곳의 AP에서 발신되는 RSSI를 Friis 공식을 통해 거리로 환산 후, 삼각측량법을 통해 위치로 변환하였다. 그리고 AP에서 발신되는 신호에는 노이즈가 발생되기 때문에 신호세기가 불규칙하게 변함으로써 정확한 위치를 얻기 힘들다. 그래서 칼만필터를 통해 실시간으로 위치를 보정하고, 보정된 위치는 서버 DB에 저장된다.

• 전기학회논문지
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• 제65권10호
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• pp.1774-1779
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• 2016

This paper proposes a portable cable fault detection system with automatic fault distinction and distance measurement using time-frequency correlation and reference signal elimination method and automatic fault classification algorithm in order to have more accurate fault determination and location detection than conventional time domain refelectometry (TDR) system despite increased signal attenuation due to the long distance to cable fault location. The performance of the developed system method was validated via an experiment in the test field constructed for the standardized performance test of power cable fault location equipments. The performance evaluation showed that accuracy of the developed system is less than 1.34%. Also, an error of automatic fault type and location by detection of phase and peak value through elimination of the reference signal and normalization of correlation coefficient and automatic fault classification algorithm not occurred.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.854-859
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• 2002

Location Based Services, or LBS refers to value-added service by processing information utilizing mobile user location. With the rapidly increasing wireless internet subscribers and world LBS market, the various location based applications are introduced such as buddy finder, proximity and security services. As the killer application of the wireless internet, the LBS has preconsidered technology about location determination technology, LBS middleware server for various application, and diverse contents processing technology. This paper describes the open architecture for LBS platform ensuring interoperability among the wireless networks and various location-based application services and the functional requirements for the LBS platform. The LBS platform in a narrow sense provides a standard interfaces for location management and network management for location services as follows, positioning (location acquisition through network or/and handset), location managing, location based functions, profile management, authentication and security, location based billing, information roaming between carriers and the system monitoring independent to specific network or ISP/CPs(Content Providers).

• 상하수도학회지
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• 제27권5호
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• pp.611-619
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• 2013

In this study, Back Tracing Calculation Method was developed to determine the leakage location and leakage amount. Previously developed determination method of monitoring location and newly developed Back Tracing Calculation Method were applied to the sample pipe network and real size pilot plant. After leakage was assumed in the pilot plant, leakage location and leakage amount could be traced by Back Tracing Calculation Method. From the results, it was found that Back Tracing Calculation Method can be applied for the leakage detection in water distribution system. Furthermore, this method can be applied for the pressure management or leakage detection as a pressure control method in water distribution system.

• Journal of Positioning, Navigation, and Timing
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• 제11권4호
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• pp.333-339
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• 2022

The satellite navigation system was developed for the purpose of calculating the location of local users, starting with the Global Positioning System (GPS) in the 1980s. Advanced countries in the space industry are operating Global Navigation Satellite System (GNSS) that covers the entire earth, such as GPS, GLONASS, Galileo, and BeiDou, by establishing satellite navigation systems for each country. Regional Navigation Satellite Systems (RNSS) such as QZSS and NavIC are also in operation. In the early 2010s, only GPS and GLONASS could calculate location using a single system for location determination. After 2016, the EU and China also completed the establishment of GNSS such as Galileo and BeiDou. As a result, satellite navigation users can benefit from improved availability of GNSS. In addition, before Galileo and BeiDou's Full Operational Capability (FOC) declaration, they used combined navigation algorithms to calculate the user's location by adding another satellite navigation system to the GPS satellites. Recently, it may be possible to calculate a user's location for each navigation system using the resources of a single system. In this paper, we evaluated the performance of single system navigation and combined navigation solutions of GPS, GLONASS, Galileo, BeiDou and QZSS individual navigation systems using high-performance GNSS receivers.

• 정보처리학회논문지D
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• 제10D권1호
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• pp.45-56
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• 2003

무선 환경에서 시공간 이동 객체들의 위치 정보를 획득할 수 있는 기술들의 발달로 인해, 차량 추적 시스템, 산불 관리 시스템, 디지털 전장 시스템 등과 같은 다양한 응용 시스템들이 개발되고 있다. 이와 같은 응용에서는 이동 객체의 연속적인 변화 과정을 표현하고, 처리할 수 있는 데이터 모델이 필요하다. 그러나 관계형 모델을 이용하여 이동 객체를 표현할 경우 매 시간 마다 변경된 모든 정보를 저장할 수 없는 문제점이 발생된다. 또한 기존의 이동 객체 데이터 모델에서는 질의 시점을 데이터베이스로 관리되는 과거 시간이나 현재로부터 가까운 미래 시간으로 제한하는 단점이 있다. 따라서 이 논문에서는 모양 변화 처리 기법과 과거와 미래의 위치 추정 함수를 사용함으로써 이동 점 및 이동 영역 객체의 연속적인 움직임을 표현하고 모든 질의 시점에서의 연산을 저리 할 수 있는 이동 객체 데이터 모델을 제안한다 아울러 제안 모델을 산불관리 시스템에 적용 및 구현한 결과를 통해 타당성을 평가한다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.843-845
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• 2003

Shortest Path Problems are among the most studied network flow optimization problems, with interesting applications in various fields. One such field is the route determination service, where various kinds of shortest path problems need to be solved in location-based service. Our research aim is to propose a route technique in real-time locationbased service (LBS) environments according to user’s route preferences such as shortest, fastest, easiest and so on. Turn costs modeling and computation are important procedures in route planning. There are major two kinds of cost parameters in route planning. One is static cost parameter which can be pre-computed such as distance and number of traffic-lane. The other is dynamic cost parameter which can be computed in run-time such as number of turns and risk of congestion. In this paper, we propose a new cost modeling method for turn costs which are traditionally attached to edges in a graph. Our proposed route determination technique also has an advantage that can provide service interoperability by implementing XML web service for the OpenLS route determination service specification. In addition to, describing the details of our shortest path algorithms, we present a location-based service system by using proposed routing algorithms.