• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.268-270
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• 2002

신속한 고장복구를 통해서 정전시간을 최소화하고자 배전기동보수업무에 최신 정보통신기술을 접목하려는 시도는 많이 있었다. 그러나, 그간 GIS, GPS, Mobile 등 시스템 구현에 필요한 핵심요소기술들이 성숙되지 않은 상태였고, 무엇보다 기반 시스템으로서의 NDIS가 전제되지 않은 상태에서 설비종합 DB와의 체계적인 연계가 미비하여 사업소 확산에 어려움이 있었다. 그렇지만, 최근에 관련 정보기술(IT)의 발달과 NDIS DB구축사업이 사업소별로 추진되어 기동보수시스템이 현장업무에 적용될 환경이 충분히 조성되어 있다고 판단된다. 이러한 배경에서 이동보수차량의 위치를 GPS와 TRS망을 연계하여 실시간 관리함으로써 고장지점으로 신속히 출동시키게 하고, 현장에서는 고장접수정보와 계통구성정보 등 관련 설비정보를 이용할 수 있게 함으로써 고객서비스의 질을 높이고, 많은 비용과 노력을 기울인 GIS DB 구축자료의 활용성과 이용효율성을 극대화시킬 수 있을 것으로 기대된다.

• Proceedings of the IEEK Conference
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• 2009.05a
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• pp.187-189
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• 2009

Position estimation in indoor is significant problem, because GPS which is usually used for outdoor positioning cannot be utilized to indoor positioning. Sensor network can be a solution for the positioning. Recently, chirp spread spectrum(CSS) specified in IEEE 802.15.4a provides an ability of ranging. Based on the results of the ranging, a position of a CSS node can be calculated by using trilateration. In this case, Kalman filter can be applied to the trilateration because of the measurement noise. In this paper, we apply the unscented Kalman filter for the trilateration. The trilateration can be represented to a nonlinear state space equation, and the unscented Kalman filter is suitable for nonlinear state space equation. Through the experimental results. we show the accuracy of the estimated position.

• Journal of Institute of Control, Robotics and Systems
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• v.9 no.1
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• pp.44-49
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• 2003

This paper describes a method of estimating miniature train location by color vision for development of an intelligent railway system model. In the teal world, to control trains automatically, GPS(Global Positioning System) is indispensable to determine the location of trains. A color vision system was used for estimating the location of trains in an indoor experiment. Two different rectangular color bars were attached to the top of each train as a means of identifying them. Several trains were detected where they were located on the track by color feature, geometric features and moment invariant, and tracked simultaneously. In the experiment the identity, location and direction of each train were estimated and transferred to the control computer using serial communication. Processing speed of up to 8 frames/sec could be achieved, which was enough speed for the real-time train control.

• Journal of the Korea Institute of Military Science and Technology
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• v.15 no.5
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• pp.623-629
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• 2012

In this paper, we analysis the performance of position estimation when adopting Dynamic TDMA(DTDMA) in JTIDS RelNav. JTIDS RelNav is widely understood as a new navigation solution possibly capable to support or take cover of the role of conventional systems including INS or GPS no matter if they are working well or not. By maximizing the efficiency of radio resource management in MAC(Medium Access Control) layer we enhance the system performance without any replacement of hardware.

• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.301-302
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• 2012

본 논문에서는 웹 서버에 사진을 등록(upload)하면 서버에서 자동으로 사진의 메타데이터(EXIF)의 GPS정보를 추출하여 미리 정이된 정보와 비교하여 사진이 촬영된 장소를 표시하고, 좌표 값을 활용하여 구글 지도(google map)과 연계되는 방법을 제안한다. 사진등록으로 사용되는 서버 웹페이지로는 php를 사용하여 그림을 등록하고, exif_read_data함수를 사용하여 메타데이터에 접근하고 메타데이터 안의 GPS의 값을 추출하여 정의된 분류표에 의해 사진을 분류하고, 구글지도와 연계하여 촬영된 위치를 지도상에서도 확인할 수 있도록 하였다.

• Journal of Information Technology Applications and Management
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• v.13 no.4
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• pp.57-70
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• 2006

Location Based Service (LBS) provides high-value added service to users and various works about IBS have been actively performed. The core technology or LBS is positioning of the users. In the field of positioning, outdoor positioning and indoor positioning are developed separately. We are proposing a design of an outdoor-indoor positioning system, implementing a prototype of the system, and verifying the usefulness of the system through experiments. Our experimental results shows that the average error of our system is 4.8 m in the case of out-door positioning and it is 3.3 m in the case of in-door positioning.

• Journal of Information Technology Services
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• v.9 no.3
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• pp.145-161
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• 2010

Recently, identifying user locations is becoming important as the society evolves into an ubiquitous society with the innovation of information technology. Particularly, many researches on identifying user locations are headed in direction to identify locations of users in the indoors, because a GPS that is widely used to identify the locations of users in the outdoors is inapplicable in the indoors. However, those researches are mostly not useful to general indoor environment because they are performed in a specific environment with specialized or customized devices such as UWB, RFID. Therefore, in this paper we propose a effective method to identify user locations in general indoor environments with wireless local network access points. Our approach enables to identify user location efficiently by measuring signal power of access points around the user and using the FRIIS formula which is used to calculate the distance among the things.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.1
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• pp.37-41
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• 2016

Localization is one of the key issues of demandable applications, especially smart services. Beside the traditional GPS based localization technique, the localization issue by visible light communications is promising market because of possibility of combining visible light communications with positioning technique for a high accurate, especially indoor localization service. This paper provides the overview and new image sensor scheme for localization issue based on visible light communication. The survey is introduced from core techniques to enhancement issues of localization. We hope these will be the essential references for the impact selection method in implementation and standardization issues.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.9 no.2
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• pp.48-55
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• 2010

This paper proposes a realtime tracking algorithm of mobile object in indoor or outdoor environment. For this purpose the proposed system selects location data closer to mobile objects in real time using Triangulation method and DCM (Database Correlation Method). Also, this system utilizes the adjusted location data selected by using Kalman filter to improve the location accuracy of transfer object. Be studied in existing the Kalman filter have unstable location data until its settlement because of it extracts current values by using the past the information. However, proposed location tracking system don't apply existent Kalman filter to this system and it permits precisional tracking location by using more effective methods.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.91-95
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• 2004

어업분야의 선진화를 위하여 해양수산분야의 현황파악 및 문제점 분석을 통한 어업정보화의 발전방향을 설정하고 다양한 정책을 효율적으로 추진하여 해양자원관리 및 활용성 제고를 통한 종합적이고 체계적인 정보화 기반을 조성해야 할 것이며, 이를 위해서는 어업통신의 정보화가 필수적일 것이다. 해상이동체인 어선들을 상대로 정보통신망을 구성하기 위한 통신수단에는 위성통신망이 있으나 장기적으로 사용시 막대한 통화료 부담이 있으므로 영세한 어업인들에게는 도입될 회망이 없다고 보아도 무방하며, 최적의 방안으로 기존의 SSB통신시스템을 이용하는 방법이 연구되고 있다. 운용비 부담이 없는 HF대 SSB통신에 의한 어업통신망을 구성하기 위해서는 육상의 해안국에서는 정보시스템 운영의 기본체계인 무선 송ㆍ수신소 구축 및 무선통신망 프로토콜에 의한 무선데이타 통신시스템이 갖추어져야 할 것이다. 그리고 어선에는 무선데이타 통신을 하기 위한 단말장치가 필수적이라 하겠다. 이에, 본 연구에서는 동 시스템에 CPS를 연동하여 이동하는 어선이 실시간에 자동으로 위치를 송출하고, 해상기상ㆍ엇가ㆍ해황 둥 각종 정보를 수집할 수 있는 어선용 단말기를 구현하기 위한 방안에 대하여 제안하였다.