• Journal of KIISE:Computing Practices and Letters
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• v.16 no.1
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• pp.45-49
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• 2010

RTLS (Real Time Locating Systems) are used to track and identify the location of objects in real time. RTLS generally consist of tags, readers and engine etc. and applied in various environments. One problem encountered in RTLS is constraints for setting up readers according to environments. In these challenging environments, it is necessary to develop techniques that can use mobile readers. As mobile reader increase, whole reader increase. And it is necessary to develop technique that can select useful readers. Selected readers including mobile readers take effect performance of RTLS. This paper introduces the technique for selecting good readers using the convex hull algorithm. The result show the good performance which based on tag's location error and reduce the networking overhead.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.19 no.5
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• pp.59-69
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• 2009

RFID tag search system which is used to find a specific tag has an application such as asset management, supply chain, and this search scheme has been given much attention so far. In RFID tag search system, especially, mobility of the reader is important in order to search tags. Therefore, even though the handheld reader cannot connect with the central database because of unreliable wireless connection or remote location, handheld reader should search the specific tag without help of the central database. In addition, in RFID tag search system, users hold not the tag but the reader, the privacy of users should be considered. Since the signal strength of the reader is stronger than that of the tag, the privacy of the reader holder is very important. Recently, in order to solve these problems, a number of RFID tag search schemes have been proposed. However, since these schemes did not consider the privacy of reader holders, there are serious privacy breaches of reader holders. In this paper, we propose efficient RFID tag search protocol for passive tags. Our proposed scheme preserves the privacy of reader holders.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.954-955
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• 2012

Recently as increasing the use of mobile communication devices the use of mobile readers for recognition tag attached to objects is also increasing. Accordingly, meantime, that gives rise to the vulnerability of RFID systems between reader and tag security issues, as well as security issues between the reader and the back-end server will occur. In this paper between the reader and the back-end server to security vulnerabilities efficient authentication protocol using the hash function is proposed.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.170-173
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• 2006

기존의 바코드와 같은 인식장치는 여러 가지 면에서 USN 환경 에서 사용하기에 상당한 제약이 따르게 된다. 그러나 RFID 시스템을 사용하면 이런 문제점들을 해결할 수 있다. RFID 기반의 시스템은 RFID 리더와 태그, 그리고 RFID 태그가 가지는 정보를 활용하기 위해서 사람이 관리하는 데이터 서버가 필요하다. 본 연구에서는 이를 응용하여 관람객에게 효과적으로 전시물을 안내해주는 2.45GHz 규격의 이동형 RFID 리더와 PDA를 이용한 전시관 어플리케이션을 구현하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.2
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• pp.73-90
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• 2010

Recently, Tan et al. introduced a serverless search protocol in which a mobile reader maintains a tag authentication list and authenticates a tag using the list without connecting authentication server. A serverless RFID system is different from general RFID systems which use on-line server models. In the serverless RFID system, since the mobility of a personalized reader must be considered, we have to protect not only the privacy of a tag but also the privacy of a mobile reader. In this paper, we define new security requirements for serverless RFID search system and propose a secure serverless RFID search system. In our system, since tag authentication information maintained by a reader is updated in every session, we can provide the backward untraceability of a mobile reader. Also we use an encrypted timestamp to block a replay attack which is major weakness of search protocols. In addition, we define a new adversary model to analyze a serverless RFID search system and prove the security of our proposed system using the model.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.42 no.2 s.302
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• pp.19-26
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• 2005

This paper is about designing and implementation of Multi-Function UHF RFID Reader Platform that receives and processes RFID tag data from the tags, and transmits the data to PC server through Bluetooth, USB, RS-232 or Ethernet. This reader system is composed of RFID module, ARM processor, RS-232 interface, USB, Ethernet MAC interface, Bluetooth etc.. This paper also provides a brief overview and concept of RFID reader, and proposes the design and implementations of the RFID reader platform. The paper evaluates and analyzes two practical implementations, fixed type and portable type.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1401-1402
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• 2008

UHF 대역의 RFID는 기존의 13.56MHz의 RFID에 비해 인식 범위가 넓어 다양한 응용 서비스를 가능하게 하는 장점을 제공하는 반면, 900MHz대 이동(Cellular) 통신과 같은 이종 무선통신과의 간섭과 멀티 리더 환경에서의 리더간 간섭의 충돌이 발생하기 때문에 시스템 성능에 제약을 받는다. 더욱이 국내의 경우 모바일 RFID의 이용이 활성화되면 현재의 협소한 주파수 대역내에서 기존의 서비스인 고정형 및 이동형 RFID가 동시 운용할 경우 리더간 간섭으로 인하여 안정적인 서비스 제공이 곤란하게 된다. 따라서 본 논문에서는 국내 UHF대역 RFID 서비스 환경에서의 전파 간섭 분석 및 효율적인 채널 운용 방안을 제시 하였다. 시뮬레이션 환경의 정확도를 높이기 위하여 MATLAB과 ADS를 연동하여 본 논문의 제안된 방안을 입증하였고, 후리의 공식을 이용해 경로손실을 모델링 하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.1015-1018
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• 2006

According to the number of the books in the library growing dramatically, dealing with them becomes a serious problem. Especially Plenty of budgets have been consumedin arranging and keeping the books. To solve these confronted problems, RFID technology is researched in this thesis. By utilizing the mobile RFID readers, Book Management System which makes possible to reduce time and cost to input the information of locationand present situation of books in real time is developed. Moreover since the active tag which uses the 900 radio frequency band and mobile RFID reader are used, it is possible to achieve multi-recognizing system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.12A
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• pp.966-974
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• 2011

In this paper, we propose an asset tracking system for applying a container port environment. If we attempt to apply this common locating system to a port environment for logistics automation, the system performance is degraded because there are many steel obstacles that cause interference in the RF communication and measurement. We divided readers into two types - fixed and mobile readers; hence, the location method operates in two steps for efficient wireless communication and precise measurement. In addition, the system estimates the location with trajectory information of assets when the small number of measurement is gathered. We implemented all the system components and installed these at a real port for evaluation. The success rate of communication and estimation is much better than that of the existing general locating system, and the location precision is substantially increased.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06d
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• pp.348-353
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• 2010

현재의 모바일 RFID 서비스는 RFID 리더가 장착된 휴대폰로 누구나 태그에 대한 접근이 가능하므로, 태그 정보가 불법적으로 수집될 수 있으며 추적이 가능하다. 특히 PAN을 구성하는 기본장치 뿐만 아니라 사용자의 소지품에 부착된 각종 RFID에 의한 정보 유출 및 사생활 침해가 큰 문제가 될 것으로 우려된다. 왜냐하면, 기존의 고정형 RFID의 경우, 리더기는 항상 고정되어 있고(예를 들면, 상점의 계산대), RFID 태그만 이동되었으나, 모바일 RFID의 경우는 "휴대폰=RFID 리더기"이므로 사생활 침해 요소가 더욱 심각해지게 된다. 따라서, 본 논문에서는 선택적인 태그 블록킹과 인가된 리더에게는 태그를 대신하여 모바일 리더가 응답하는 프락시 기능을 가진 모바일 RFID 프락시 시스템을 설계하고, 제안 시스템의 기능 및 구조적 특징을 기존 기법들과 비교 분석한다.