• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2008.04a
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• pp.75-78
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• 2008

본 논문에서는 싸움소의 체계적인 관리를 위해 RFID 기술 기반 싸움소 이력관리를 위한 시스템을 구현하였다. 이를 위해 먼저 싸움소의 사육 및 훈련 정보들을 분석 검토하고, 이를 바탕으로 실시간으로 필드의 싸움소에 대한 사육 및 훈련 정보들을 분석 검토하고, 이를 바탕으로 실시간으로 필드의 싸움소에 대한 사육 및 훈련 정보를 효율적으로 관리할 수 있는 RFID 미들웨어 시스템과 인터넷 기반으로 사육, 훈련, 전적 등의 정보를 통합 관리 및 제공할 수 있는 RFID 서버 시스템을 설계${\cdot}$구현하였다. 이력관리 시스템에서는 Tag의 순차적이 인식을 기반으로 하였으며, 전적정보 관리시스템에서는 동시에 다수의 Tag 인식이 가능하도록 하였다.

• Journal of Institute of Control, Robotics and Systems
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• v.12 no.1
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• pp.9-14
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• 2006

This paper presents methods of robot localization using recent radio frequency identification technology. If the absolute position and orientation of a tag are given in an indoor environment where RFID tags are installed, a robot can estimate its location using the relationship of the identified tag and the robot in a relative coordinate. To derive this relationship, we propose three estimation techniques using a model of a RFID reader, the direction of identification and the detection range. In this algorithm, a suitable estimation method is selected out of the three proposed techniques depending on the situations and trajectory of robot in the detection range. Simulation and experimental results show that the proposed methods can provide good performance for localization.

• Journal of Institute of Control, Robotics and Systems
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• v.13 no.12
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• pp.1192-1197
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• 2007

This study proposes an automated pegboard utilizing the RFID system with multiple reader antennas for the rehabilitation services and the occupational therapy. The system automates the scoring by detecting the plugging correctness as well as the plugging status. It also aims to increase the patient's interest and the functional intelligence. The system was prototyped and the RFID read rate (over 99.998%) was confirmed. The system was also tested for the automatic capability of the scoring the session. The proposed system will be served as the typical example for the ubiquitous rehabilitation devices.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.2 no.6
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• pp.299-311
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• 2008

The Radio Frequency IDentification (RFID) system is a contactless automatic identification system, which comprises readers and tags. In RFID systems, a reader collision occurs when there is interference in communication between one reader and the tags, due to the signals from other readers. The reader collision problem is considered as the fundamental problem affecting high density RFID reader installations. In this paper, we analyze the existing reader anti-collision algorithms. We also propose a pulse protocol-based reader anti-collision algorithm using slot occupied probability (SOP). The implementation of this improvement is simple, yet it effectively mitigates most reader collisions in dense reader mode, as shown in our simulation. That is, the proposed algorithm reduces the identification time, and increasesthe system throughput and system efficiency compared with the conventional reader anti-collision algorithms.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.789-792
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• 2009

As RFID technology is becoming ubiquitous, the secunty of these systems gets much attention. Its fields of usage include personal identification, supply-chain management systems, and many more. Many kinds of RFID tags are available on the market which differ both in storage, and computational capacity. Since by standard IT means all the tags have small capacities, the security mechanisms which are in use in computer networks are not suitable. For expensive tags with relatively large computational capacities many secure communication protocols were developed, for cheap low-end tags, only a few lightweight protocols exist. In this paper we introduce our solution, which is based on the least computation demanding operator, the exclusive or function. By introducing two tags instead of one in the RFID system, our scheme provides security solutions which are comparable with those provided by the lightweight protocols. In the meantime, our scheme does not demand any computational steps to be made by the ta.

• 한국경영정보학회:학술대회논문집
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• 2007.11a
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• pp.423-428
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• 2007

본 연구는 미술관이나 박물관과 같은 전시공간에서 모바일 RFID를 활용한 비즈니스 모델을 설계한다. 기존의 전시공간에서 관람객이 겪을 수 밖에 없었던 정보 취득 및 정보 저장의 제약성 등과 같은 한계점이 모바일 RFID를 통한 'Seamlessness'(연결완전성)에 의해 극복될 것으로 판단하고, 이를 바탕으로 전시공간에서 모바일 RFID를 활용하여 수행될 수 있는 비즈니스 모델 시나리오를 제시한다. 또한 본 비즈니스 모델 수행 시(時), 발생할 수 있는 이슈에 대하여 검토하고 그에 대한 대안을 제시하며, 수익 시뮬레이션을 통한 전시공간 사업자의 Working Condition에 대하여 검토한다.

• 한국ITS학회:학술대회논문집
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• v.2006 no.10
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• pp.179-181
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• 2006

톨게이트에서 사용되는 UHF RFID 비발디 배열 안테나를 설계하였다. 안테나의 주파수 대역은 미국 기준의 RFID UHF 대역으로 $902{\sim}928MHz$이다. 안테나 설계는 먼저 단일소자 비발디 안테나를 설계한 후, 전력분배 비율 0.3:1:1:0.3으로 $1{\times}4$ 배열한 안테나로 설계하였다. 설계된 배열 안테나는 VSWR 2:1이하에서 $850{\sim}942MHz$인 S11 특성을 보였다. 이득은 최대방사 9.93dBi를 얻었다. 안테나 제작은 주파수를 높여 scale down하여, 1소자 비발디를 제작하고 이의 특성을 측정하였다.

• Journal of KIISE:Information Networking
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• v.37 no.2
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• pp.99-108
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• 2010

The Wireless Ad Hoc network is discussed as a core technology for ubiquitous computing, and the smart tag technology is currently being actively discussed as a part of the sensor network. Thus, considering its security may advance the realization of ubiquitous computing. RFID (Radio Frequency Identification) technology using the smart tag technology as a part of the sensor network is currently in the limelight. In particular, when RFID is applied to a knowledge management system managing various data, data mobility and management convenience are ensured and automated knowledge service can be provided to users. Accordingly, this paper to proposed a secure scheme for mobility knowledge management systems using multi-agents differentiated from the existing knowledge management systems. Specifically, the proposed scheme designates user's authentication and privilege information in multi-agents and provides effective knowledge service through grouping based on user information. Moreover, even user's movement, the proposed scheme ensures service availability and provides continuous information through communication with multi-agent systems.

• Journal of Biomedical Engineering Research
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• v.28 no.3
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• pp.325-331
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• 2007

Personal identification is essential for the automatic measurement of biosignal information in home healthcare systems. Personal identification is usually achieved with passive radio frequency identification (RFID), which does little more than store a unique identification number. However, passive RFID is not ideal for automatic identification. We present a user identification system based on radio signal strength indication (RSSI) using ZigBee for active RFID tags. Personal identification is achieved by finding the largest RSSI value from aggregated beacon messages that are periodically transmitted by active RFID tags carried by users. Obtaining reliable person!'.! identification without restricting the orientation requires a certain distance between the closest active RFID tag from the ZED and the second closest tag. The results show that the closest active RFID tag from the ZED and the second closest tag must be at least 70 cm apart to achieve reliable personal identification.

• Journal of the Korean Institute of Intelligent Systems
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• v.20 no.1
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• pp.146-152
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• 2010

In this paper, we implemented the intelligent healthcare system self-diagnosis that can achieve self-diagnosis by measured bio-signal(blood pressure, blood sugar, body fat monitor) after the recognize a user to access using RFID. The implemented healthcare self-diagnosis intelligent system is consist of kiosk structure that is RFID reader, bio-signal measuring instrument(hemadynamometer, glucometer, body fat monitor), computer for a part of database server and printer for print the result of self-diagnosis. It can achieve self-diagnosis of a user after compare and analyze the measured data and information of a user from database. The implemented system can make simple self-diagnosis even if not take a physical examination at hospital and apply to company, school, etc.