• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.345-348
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• 2009

본 연구에서는 실내에서의 위치추적을 위해 가속도 센서와 각속도 센서를 이용한 위치추적기법을 제안하였다. 기존의 실내 위치추적기법은 전파의 세기를 이용하여 위치추적을 수행하는 RSSI기법과 초음파를 이용한 방법이 제시되었다. 하지만 기존 실내위치추적 기법에서는 좌표 값을 알고 있는 고정된 노드를 필수적으로 사용해야하는 단점이 있다. 본 연구에서는 이러한 단점을 보완하기위하여 착용형 노드에 가속도센서와 각속도 센서를 부착하고 이동속도와 방향을 계측하여 실내에서의 위치추적을 수행하고자 하였다. 이를 위해 3축 가속도 센서와 2축의 각속도 센서를 사용하였으며, 센서로부터 출력되는 아날로그신호를 계측 및 무선전송하기 위하여 Zigbee기반의 무선 센서노드를 사용하였다. 무선센서노드로부터 측정된 가속도신호와 각속도 신호의 분석을 통해 실내위치추적 가능성을 평가하였으며, 평가 결과 가속도센서와 각속도 센서를 이용한 실내위치추적의 가능성을 확인하였다.

• Journal of Satellite, Information and Communications
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• v.8 no.4
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• pp.64-69
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• 2013

Recently, users who are interested in the service at indoor spaces is increasing. An indoor positioning system can minimize a range of positioning error using a variety of wireless communication infrastructure. Also, the system improves an indoor positioning accuracy by combining a mobile communication network. However, flexible positioning technologies regardless of an environment are insufficient. Therefore, this is time for a systematic study on an indoor positioning system business model. This paper classify differences between an indoor positioning system technology and outdoor positioning system technology. And we research a construction and application of the indoor positioning system that is adapted a wireless communication system (Wi-Fi, Bluetooth, RFID, UWE, Fingerprint, etc.) in domestic and foreign. We present a successful model of indoor positioning system and the development for future systems.

• Spatial Information Research
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• v.19 no.3
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• pp.53-62
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• 2011

Spatial information services in indoor space are an im portant application area of GIS as in outdoor space. Unlike in outdoor space, a position in indoor space is specified by a symbolic code such as room number, rather than coordinate. Therefore tracking in indoor space is no longer a prediction of coordinates but a symbolic estimation on the current position of a moving object. In this paper, we propose a framework for tracking moving objects in indoor symbolic space with RFID sensors. First, we introduce the concepts of indoor symbolic space and tracking in indoor symbolic space, and define the accessibility graph for trackable indoor symbolic space. Second, we propose a deployment method of RFID readers and a construction algorithm of accessibility graph for trackable indoor symbolic space. Third, a tracking method is proposed for moving objects in symbolic indoor space with RFID sensors. Finally, we present an implementation exmaple and the result of experiment with real data to validate the proposed method.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.638-646
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• 2006

유비쿼터스 시대가 도래함에 따라 사회적으로 실내 위치 추적 시스템에 대한 관심이 증가되었다. 하지만 기존 실내 위치 추적 시스템은 실내 환경의 빈번한 변화에 능동적으로 대응하지 못하고, 실내 환경의 NLOS 특성으로 인하여 이동 객체의 정확한 위치 측정이 어려운 문제점이 있다. 본 연구의 목적은 앞으로 유비쿼터스 시대가 도래함에 따라 다양한 사용자의 요구를 만족시키기 위한 서비스를 제공하는데 필수 요소인 실내 이동 객체의 위치를 효과적으로 파악하고, 이동 객체의 위치 정확도를 향상시킨 환경 적응형 위치 추적시스템을 제안한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.4B
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• pp.300-308
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• 2012

Many indoor location tracking technologies have been proposed. Generally indoor location tracking using TOA signal is used, there is a weak point that it's difficult to track the location due to obstacles like a refraction, reflection and dispersion of radio wave. In this paper, we apply ETOA(Estimated-TOA) algorithm in NLOS(Non-Line-Of-Sight) environment to solve above problem. In NLOS environment, TOA value between Beacon and Mobile node is predicted by ETOA algorithm and the tracking of indoor location is also possible to identify using two NLOS beacons of three beacons by this algorithm. We show that the proposed algorithm is accurate location tracking is accomplished using the applying the proposed algorithm to indoor moving robot and the inertia sensor of robot and Kalman filter algorithm.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2010.09a
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• pp.7-9
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• 2010

이에 본 논문에서는 이동 객체의 위치를 향상 명시적으로 결정할 수 있는 추적 가능 실내 기호 공간(Trackable Indoor Symbolic Space)을 정의하고, 이러한 공간을 정의하기 위한 규칙들을 제안한다 위치를 좌표로 나타내는 실외 공간의 응용 프로그램들과는 달리, 대부분의 실내공간의 응용 프로그램들은 위치를 방 번호와 같은 기호적 값으로 표현하는 기호참조체계를 이용한다 이에, 본 논문에서는 실내기호공간의 개념과 실내 기호공간에서의 이동객체의 위치 추정에 대해 소개하고, 추정 가능한 실내공간을 만들기 위한 규칙과 방법을 제안하고 있다.

• Annual Conference of KIPS
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• 2005.11a
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• pp.1141-1144
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• 2005

본 논문은 실내에서 홈 거주자의 위치를 인식하기 위해 근접성을 이용한 위치 추적 시스템 환경을 제안하고자 한다. 이를 위해 기존 실내의 고정된 위치에 있는 구조/시설물 및 가전제품의 ON/OFF 스위치를 이용하며 기타 추가적인 스위치 및 센서를 부착하여 개폐동작이 일어날 때 발생되는 신호를 검출하여 실제위치를 얻는다. 발생되는 신호는 Pull-up 저항을 이용한 신호 검출 방법으로 눌려진 스위치나 센서에서 발생된 아날로그 신호를 검출한다. 검출된 신호의 고유한 ID값은 Sensor TMO로 송신되어 수집된다. 수집된 센서ID는 소켓통신을 이용하여 홈서버인 실내위치추적시스템으로 보내질 뿐아니라 원격 모니터링 GUI를 통해 실내 거주자의 위치를 GUI의 가상공간 좌표와 매핑된 홈 거주자의 위치를 보인다. 본 논문에서 제안한 실내위치추적시스템은 홈 거주자의 위치를 주기적으로 모니터링하고 거주자의 이동 패턴과 활동 상황을 파악하여 헬스케어 정보로 활용할 예정이다.

• Journal of Digital Convergence
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• v.17 no.12
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• pp.211-217
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• 2019

Location positioning systems are available in applications such as mobile, robotic tracking systems and Wireless location-based service (LBS) applications. The GPS system is the most well-known location tracking system, but it is not easy to use indoors. The method of radio frequency identification (RFID) location tracking was studied in terms of cost-effectiveness for indoor location tracking systems. Most RFID systems use active RFID tags using expendable batteries, but in this paper, an inexpensive indoor location tracking system using passive RFID tags has been developed. A pattern matching method and a system for tracing location by generating regression curves were studied to use precision tracking algorithms. The system was tested by verifying the level of error caused by noise. The three-dimensional curves are produced by the regression equation estimated the statistically meaningful coordinates by the differential equation. The proposed system could also be applied to mobile robot systems, AGVs and mobile phone LBSs.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.1
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• pp.207-214
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• 2016

RFID technology is a technology perceiving information with the device called reader and tag which is now used in public transportation such as Hi-pass. In this paper, we design a system which tracks indoor location using this technology. GPS, the most frequently used location-tracking system, has a defect that its accuracy decreases when the device is indoor. In suggested experiment, we simulate signals according to the moving of located objects, then compare with the result of the experiment. Based on the extracted data, we inform data which is for the purpose of tracking system based on analysis of the route and errors. Simulations for the tracking were performed with relocation of real objects. In the real experiment, we arrange the readers around the room and move the tagged object that we like to know the location, then analyze the data from the equipment. This paper suggests the analyzed data for the future indoor tag tracking applications. We expect that the RFID based location positioning data will be used for other indoor positioning research and development.

• Smart Media Journal
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• v.4 no.2
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• pp.68-76
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• 2015

Recently, research on indoor locating techniques using smart device sensors has been conducted actively, Owing to the exponential increase in the use of various smart devices. However, in order to develop indoor location techniques, there are limitations due to the requirement that the tracking system has to function without GPS. In this paper, we propose an accurate indoor locating system that does not require additional infrastructure. The proposed scheme is developed based on the idea that the advantages and disadvantages of "Wi-Fi Fingerprinting" and "Step Detection" techniques are complementary. In the proposed scheme, we track users with "Step Detection," and correct errors with "Wi-Fi Fingerprinting." In this paper, we demonstrate the effectiveness and feasibility of our proposed scheme through experiments.