• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.11
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• pp.2119-2124
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• 2008

An information-oriented basis in today's society has been changing fast, and the desire for connectivity has caused an exponential growth in wireless communication and sensor network. Sensor networks using RFID, in particular, have led this trend due to the increasing exchange of data in Ubiquitous such as the home RF, access control system, U-Healthcare, and Logistics information Systems. Also, the RFID when it applies a technique, is able to raise the stability of shipping as controling the mobile course and an entrance and exit of the crews an well as previously preventing an accident from shipping. In this paper, we designed and implemented personnel control system using UHF-RFID in vessels which shows through host PC reading and writing tag.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.574-578
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• 2006

유비쿼터스 컴퓨팅 환경에서는 센서를 통하여 실시간의 상황인식 서비스를 제공하며, 이를 위해 사용자의 위치 정보 수집이 필요하다. NTT에서는 RFID에 대한 익명화를 통한 프라이버시보호 메커니즘을 제안하였다. 그러나, 불법적으로 접근하는 리더가 존재할 경우 i값의 비동기화를 통한 태그에 대한 Random Tampering공격이 가능하다. 본 논문에서는 NTT 연구소의 RFID 익명화 방법을 개선하여 태그의 Random Tampering 공격 방지가 가능하고, 태그와 리더 상호간 인증이 가능하며, 연산 과정을 절감시킨 새로운 RFID 익명화 프로토콜을 제안한다. 제안한 방법을 통하여 보다 안전하고 효율적으로 RFID기반 센서 네트워크 환경에서 사용자의 프라이버시를 보호할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.126-129
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• 2018

기존 자율주행자동차의 영상 센서 시스템이 표지판에 약간의 부착물만 붙어도 인식이 되지 않는 점을 고려해 Semi-Passive RFID(Radio-Frequency Identification)기술을 이용한다. 각 표지판마다 소스코드를 설정한 후 RFID 태그를 부착하고 자동차의 룸미러 뒤쪽 중앙에 RFID 리더기를 부착해 원거리에서 태그와 리더기의 작용을 통해 영상 센서 시스템의 취약점을 보완해 오류를 줄인다. 태그의 건전지를 대체하여 M24LR16E칩을 적용한다. 이 칩은 기존에 낭비되는 전파와 폐열, 움직임에 따라 발생하는 동작 에너지의 미세한 에너지를 모아 메모리칩을 구동한다. 또한 GPS를 이용한 위치정보 획득 및 지리적 변화의 낮은 정확도를 보완해 도시 인프라에 부착된 RFID를 제안하여 이를 이용한 위치정보 획득과 처리방안의 문제점도 해결한다.

• Journal of Korea Society of Industrial Information Systems
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• v.15 no.3
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• pp.1-9
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• 2010

In recent year, the cores of ubiquitous environment are sensor networks and RFID systems. RFID system transmits the electronic information of the tag to the reader by using RF signal. Collision happens in RFID system when there are many matched tags, and it degrades the tag identification performance. Such a system needs algorithm which is able to arbitrate tag collision. This paper suggests a hybrid method which reduces collision between the tags, and can quickly identify the tag. The proposed method operates based on certainty, which takes an advantage of tree based algorithm, and to reduce collision it selects transmission time slot by using tag ID. The simulation results show the suggested method has higher performance in the number of queries and collision compared to other tree based and hybrid algorithms.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.858-861
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• 2011

In this paper, we present a RFID system by using a wireless sensor network. The proposed system is installed in glove for activity monitoring. The RFID reader, to send data by using sensor network platform and RFID tag are small size, the shape of quadrangle, and operate in the frequency of 13.56 MHz. The sensor node can read RFID tags on the various objects used in daily living such as furniture, medicines, and kitchenwares. The sensor node reads the data of RFID tags, it transmits wireless packets to the sink node. The sink node sends the received packet immediately to a server system. The data from each RFID system is collected into a database, and then the data are processed to visualize the measurement of daily living activities of users. We provide a web-based monitoring system, and can see the number of RFID tag readings per day as bar charts. The result of experiments demonstrates that the way we propose can help to check the situation of life for people who live alone.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.687-692
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• 2009

This paper presents the development of RFID educational system based on 900MHz air interface between the reader and the active tag. The software of reader and the active tag is developed on embedded environment, and the software of PC controlling the reader is based on window OS operated as the server. The ATmega128 VLSI chip is used for the processor of the reader and the active tag. As the development environment, AVR compiler is used for the reader and the active tag of which the programming language is C. The visual C++language of the visual studio on the PC activated as the server is used for development language. Main functions of this system are to control tag containing EPC global Data by PC through the reader, to obtain information of tag through the internet and to read/write data on tag memory. Software design of 900MHz RFID/USN educational system is done on the basis of these functions.

• 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.

• Journal of the Korea Society of Computer and Information
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• v.14 no.7
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• pp.49-56
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• 2009

In this paper, we present a daily activity monitoring system by using a wireless sensor network. The proposed system is installed in glove for activity monitoring. The RFID reader, to send data by using sensor network platform and RFID tag are small size, the shape of quadrangle, and operate in the frequency of 13.56 MHz. The sensor node can read RFID tags on the various objects used in daily living such as furniture, medicines, and kitchenwares. The sensor node reads the data of RFID tags, it transmits wireless packets to the sink node. The sink node sends the received packet immediately to a server system. The data from each RFID system is collected into a database, and then the data are processed to visualize the measurement of daily living activities of users. We provide a web-based monitoring system, and can see the number of RFID tag readings per day as bar charts. The result of experiments demonstrates that the way we propose can help to check the situation of life for people who live alone.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.229-231
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• 2004

휴대 단말기 보유율의 급격한 증가는 새롭고 다양한 형태의 무선 통신 기술의 개발을 촉진시키는 계기가 되었으며, 특히 국내의 경우 이동통신 시장의 경제적이나 양적으로 급속한 성장을 이루어 사회 전반에 걸쳐서 새로운 가치를 생산해 내어 생활 모습을 크게 바꾸어 놓고있다. 따라서 이러한 환경의 변화는 사용자 중심의 다양한 서비스를 제공할 수 있는 차세대 무선 통신 기술의 연구가 필요한 실정이다. 따라서 본 논문에서는 RF 태그 기반의 네트워크 형성과 더불어 유비컴퓨팅 환경에서 요구되는 서비스 생성에 따른 인증 및 동일한 서비스에 대한 관리 방식을 제안하고자 한다. 제안된 방식의 경우 RF 태그를 기반으로 이루어지는 네트워크에서 태그가 생성하는 서비스에 따라 인증 레벨을 설정하고 동일한 서비스와 인중 레벨을 갖는 서비스가 발생할 경우 이를 관리할 수 있는 그룹 아이디와 키를 생성해 관리하는 방식을 제안하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37A no.12
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• pp.1013-1022
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• 2012

Tag collection is one of the major concerns in radio frequency identification(RFID) system. All tags in RFID reader's transmission range send response message back to the reader in response to collection request message on the given rf channel. When multiple tags respond simultaneously, tag-collision may occur. Tag-collision problem is one of the most important issues in active RFID performance. To mitigate this problem, frame slotted ALOHA(FSA) anti-collision protocol is widely used in active RFID system. Several studies show that the maximum system efficiency of FSA anti-collision protocol is 36.8%. In this paper, we propose an efficient slotted CSMA/CA protocol to improve tag collection performance. We compare our protocol to the FSA anti-collision protocol. For the experiment, an 433MHz active RFID system is implemented, which is composed of an RFID reader and multiple tags. We evaluated the tag collection performance using one RFID reader and 40 tags in the real test bed. The experimental result shows that proposed protocol improves the tag collection time, round and collision probability by 18%, 37.4% and 77.8%, respectively.