• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.3
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• pp.318-326
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• 2013

In this paper, a novel WUSB (Wireless USB) over WBAN (Wireless Body Area Networks) MAC protocol is proposed to improve efficiency of sensing the personal information. Furthermore, a localization technique based on that protocol is also proposed for indoor localization in a ship. For this purpose, the proposed localization algorithm minimizes power consumption and estimates location with accuracy. It is executed independently at each sensor node on the basis of WUSB over WBAN protocol. And it minimizes power consumption by estimating locations of sensor nodes without GPS (Global Positioning Systems).

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.4
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• pp.537-542
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• 2014

Track circuit is a simple electrical device which lies in the connection of the two rails by the wheels and axle of locomotives and rolling stock to short out an electrical circuit, used to detect the absence of a train on rail tracks. In railway signaling system, there are similar systems such as RFID and wheel sensor, GPS etc, are research and developing. Hybrid track circuit is using RFID antenna and reader on the cab and RFID tag on the sleeper. because of the safety in railway operation, tag detection of train position detection function in the hybrid track circuit needs high reliability. This paper studied tag recognition enhancement used tag angles.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.04a
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• pp.274-274
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• 2007

1)모바일 로봇의 위치인식기술; 모바일 로봇의 위치인식 방법, 특징, 개발동향 소개 2)In Door GPS;모바일 로봇의 위치인식기술의 하나인 Active beacon system에 대해 소개하고 이를 구현하기 위한 방법, 특징, 개발 동향 소개 (주)나인티시스템에서 개발한 초음파 및 RF를 이용한 위치인식기술인 iGS를 소개함 3)iGS의 구현 방법;iGS에 적용된 알고리즘 및 이의 구현 결과 소개 4)적용사례 및 응용분야; iGS의 작용 사례 및 응용 분야 소개 5)문제점 및 개선 방향; iGS의 문제점 및 개선 방향 소개

• Journal of Internet Computing and Services
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• v.9 no.4
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• pp.157-166
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• 2008

There has been a renewal of interest in management of underground facility in recent years. As several research have been made on management for underground facility of waterworks pipe. In this paper smart-tag is defined and applied to requiring ubiquitous environment. Also, GPS is essential technology for the implementation of proposed program, which has GPS and RFID mixed business model. And it manages data of underground facility with RFID system effectively and provides the high quality practical effectiveness of entire system through GPS receiving module and network communication on GIS. In conclusion, this paper proposed applications management system with location mixed database. Proposed database and interface skill is tested and evaluated through the simulation.

• KIISE Transactions on Computing Practices
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• v.21 no.1
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• pp.64-69
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• 2015

Place awareness is an essential for location-based services that are widely provided to smartphone users. However, traditional GPS-based methods are only valid outdoors where the GPS signal is strong and also require symbolic place information of the physical location. In this paper, environmental sounds and images are used to recognize important aspects of each place. The proposed method extracts feature vectors from visual, auditory and location data recorded by a smartphone with built-in camera, microphone and GPS sensors modules. The heterogeneous feature vectors were then learned by an ensemble learning method that learns each group of feature vectors for each classifier respectively and votes to produce the highest weighted result. The proposed method is evaluated for place recognition using a data group of 3000 samples in six places and the experimental results show a remarkably improved recognition accuracy when using all kinds of sensory data comparing to results using data from a single sensor or audio-visual integrated data only.

• Annual Conference of KIPS
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• 2018.10a
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• pp.147-150
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• 2018

최근 사용자 편의성 제공을 위한 위치 기반의 데이터 마이닝 활용 서비스가 다양하게 개발되고 있다. 대부분의 이러한 응용 서비스들은 지도 API를 기반으로 한 정적인 정보를 주로 이용하여 사용자에게 서비스를 제공한다. 하지만, 사용자는 그에 비해 해당 GPS 좌표 위치 기반의 실시간 정보 서비스 요구한다. 이에 본 논문에서는 해당 GPS 좌표 위치의 공간 인식, 밀도 및 움직임 포착 등을 파악하고 이를 기반으로 새로운 서비스를 제공하는 기법을 제안한다.

• Journal of Drive and Control
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• v.17 no.4
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• pp.72-79
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• 2020

To ensure the safety of Advanced Driver Assistance Systems (ADAS) or autonomous vehicles, it is important to recognize the vehicle position, and specifically, the increased accuracy of the lateral position of the vehicle is required. In recent years, the quality of GPS signals has improved a lot and the price has decreased significantly, but extreme urban environments such as tunnels still pose a critical challenge. In this study, we proposed stable and precise lane recognition and tracking methods to solve these two issues via fusion of AVM images and vehicle sensor data using an extended Kalman filter. In addition, the vehicle's lateral position recognition and the abnormal state of RTK GPS were determined using this approach. The proposed method was validated via actual vehicle experiments in urban areas reporting multipath and signal disconnections.

• The KIPS Transactions:PartD
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• v.12D no.3 s.99
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• pp.481-492
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• 2005

To guide the guiding robot for the visually impaired carefully, the digital map to be used to search a path must be detailed and has some information about dangerous spots. It also has to search not only safe but also short path through the position data by GPS and INS sensors. In this paper, as the difference of the ability that the visually unpaired can recognize, we have developed the localization tracking system so that it can make a movement path and verify position information, and the global navigation system for the visually impaired using the GPS and INS. This system can be used when the visually impaired move short path relatively. We had also verified that the system was able to correct the position as the assistant navigation system of the GPS on the outside.

• Journal of Advanced Navigation Technology
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• v.15 no.5
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• pp.839-844
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• 2011

Various technologies such as infrared light, ultrasonic waves, RFID, GPS, UWB, and signal indicators have been incorporated in the location tracking system. However, such pre-existing systems require location recognition in shadow areas. This study proposes a location tracking system that utilizes Cooperative Spectrum Sensing. Cooperative Spectrum Sensing is not only able to track the location and path of moving objects but also recognize when objects breakaway from the path set by sensors and guide them back. In addition, it has the advantage of being more efficient in terms of frequency usage. It is able to automatically fix power transmission and frequency modulation for transmission cognitive users to an optimum level within the range that does not cause interference for primary users.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.2
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• pp.385-390
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• 2008

The Study of environment monitoring through huge network of wireless sensor node is worked with activity. The sensor nodes must be very small, light and low cost. The localization which may determine where a given node is physically located in a network is one of the quite important problems for wireless sensor network. But simple localization method is required as excluding the usage of GPS(Global Positioning System) by the limit condition such as the node size, costs, and so on. In this paper, very simple method using connectivity for the outdoor RF communication environment is proposed. The proposed method is demonstrated through simulation.