• The Journal of the Korea Contents Association
• /
• v.7 no.10
• /
• pp.27-35
• /
• 2007

Radio Frequency Identification(RFID) technology is set to play an essential role in object tracking or supply chain management systems. New challenges for RFID data management are needed in the RFID applications. RFID data are generated quickly and automatically, and can be used for object tracking, or for real-time monitoring. These applications are mostly associated with the timestamps when the events happen. In this paper, we propose a temporal RFID data model to maintain the history of events and state changes and to monitor the states of RFID objects. Also we propose data filtering method of non active data based on temporal RFID data model. This data model involves essential basic operations for RFID data. We show increased query performance through the data filtering method of non active data.

• 한국공간정보시스템학회:학술대회논문집
• /
• 2004.12a
• /
• pp.14-19
• /
• 2004

RFID는 라디오 주파수 기반의 자동 인식 데이터 수집 장치로서 유비쿼터스 컴퓨팅 기반 기술의 핵심 분야이다. RFID 태그(전자태그)가 부착된 개체의 위치를 저장할 수 있기 때문에 시간에 따라 위치가 변하는 이동체와 유사하다. 그러나 태그 객체는 판독기(reader)의 위치로 인식되며 일정 수 이상의 객체들이 같은 시간에 함께 이동하는 특징을 가지기 때문에 기존의 이동체 모델링 방법을 사용하여 전자 태그 객체를 표현하면 색인의 성능이 저하되는 문제가 발생한다. 이 논문에서는 시공간 질의를 처리하는 색인의 성능을 개선하기 위하여 태그 객체의 특징을 반영한 모델링 기법을 제안한다. 제안한 모델링 기법에서 간격 데이터 개념을 기반으로 시간과 공간 도메인 외에 식별자 도메인을 추가하여 태그 객체를 표현한다. 그리고 세 가지 도메인을 이용하여 태그 객체에 대한 색인을 구성한다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.38A no.12
• /
• pp.983-990
• /
• 2013

In this paper, we proposed a Hangul type chipless RFID tag, which has better legibility than the conventional chipless RFID tag not only to a computer but also to a human. We made consonant model, vowel model and whole character model by WIPL tool and checked the applicability of Hangul type chipless RFID tag. We obtain the RCS pattern of each character by simulation. Finally, We classify the character from input data in noisy environment using a variance of the data.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2007.10a
• /
• pp.578-581
• /
• 2007

For tracing tag locations, a trajectories should be modeled and indexed in radio frequency identification (RFID) systems. The trajectory of a tag can be represented as a line that connects two spatiotemporal locations captured when the tag enters and leaves the vicinity of a reader. If a tag enters but does not leave a reader, its trajectory is represented only as a point captured at entry. Because the information that the tag stays in the reader is missing from the trajectory represented only as a point, we should extend the region of a query to find the tag that remains in a reader. In this paper, we propose an interval data model of tag's trajectory in order to solve the problem. Trajectories of tags are represented as two kinds of intervals; dynamic intervals which are time-dependent lines and static intervals which are fixed lines. We also show that the interval data model has better performance than others with a cost model

• Journal of the Institute of Electronics Engineers of Korea CI
• /
• v.47 no.4
• /
• pp.118-124
• /
• 2010

We proposed a goods load simulator for optimum RFID distribution, which includes experiment process modeling guidelines for stable RFID scan rate, efficient cost-reduction of RFID application or even speedy management of RFID field. We show verification of this simulator using field test of distribution, and the proposed simulator has better performance than the classic method, and demonstrate the proposed is efficient method of draw up guidelines on RFID distribution.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.9 no.1
• /
• pp.61-66
• /
• 2014

As a key technology of U-health, RFID can be applied to the hospitals in a variety of cases such as patient tracking, medical instrument management, and so on. However, adoption of RFID in healthcare does not reach expectations because of huge cost. Exact estimation of cost and effectiveness will boost adoption of RFID in healthcare. This study proposes a novel simulation technique to evaluate cost and effectiveness of RFID in hospital environment. To do this, this study proposes a technique for modeling patients' movements in a hospital. Based on the model, this study provides how to obtain tag event dataset by means of simulating identifications of RFID tags that are attached to patients.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.9 no.7
• /
• pp.1432-1438
• /
• 2005

The RFID (Radio Frequency Identification) technology is a non-contact identification system which can wireless reading of information, by attaching tags on objects; various applications of the technology are feasible throughout a dive of industries, and researches are currently under way. Recently, in connection with the wireless communication industry, application service models conveying information to the users through mobile devices with RFID readers were suggested. Such application service based on mobile RFID technology requires schema that models the form of data. Therefore, this study analyzes the mobile RFID application service model that will be serviced in the mobile environment, functions and elements of the protocol, and the interface, designing a language to process the data and express contents in the said service models, and we simulated the service for test it.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• v.9 no.2
• /
• pp.975-978
• /
• 2005

The RFID(Radio Frequency Identification) technology is a non-contact identification system which can wireless reading of information, by attaching tags on objects; various applications of the technology are feasible throughout a diversity of industries, and researches are currently under way. Recently, in connection with the wireless communication industry, application service models conveying information to the users through mobile devices with RFID readers were suggested. Such application service based on mobile RFID technology requires schema that models the form of data. Therefore, this study analyses the mobile RFID application service model that will be serviced in the mobile environment, functions and elements of the protocol, and the interface, designing a language to process the data and express contents in the said service models.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2008.10a
• /
• pp.143-146
• /
• 2008

For tracing tag locations, a trajectories should be modeled and indexed in radio frequency identification (RFID) systems. The trajectory of a tag can be represented as a line that connects two spatiotemporal locations captured when the tag enters and leaves the vicinity of a reader. If a tag enters but does not leave a reader, its trajectory is represented only as a point captured at entry and we should extend the region of a query to find the tag that remains in a reader. In this paper, we propose an interval data model of tag's trajectory in order to solve the problem. For the interval data model. we propose a new index scheme called the IR-tree(Interval R-tree) and algorithms of insert and split for processing query efficiently. We also evaluate the performance of the proposed index scheme and compare it with the previous indexes.

• Proceedings of the Korean Information Science Society Conference
• /
• 2010.06c
• /
• pp.181-184
• /
• 2010

RFID 미들웨어에서 저장소 역할을 하는 EPCIS는 이전까지 물품의 식별 정보만을 저장 및 관리하고 있었다. 하지만, 최근에는 많은 물류 분야의 응용에서 물품의 식별 정보뿐만 아니라 센서 및 위치 정보 등을 포함하는 다양한 물류 정보를 EPCIS에서 저장 및 관리하도록 요구하고 있다. 하지만, 현재 EPCIS에서는 RFID 태그의 식별 정보 이외의 정보에 대하여 처리를 하지 않고 있으며, 설령 처리한다하더라도 비효율적인 조인으로 인한 속도 저하가 일어날 수 있다. 즉, 각 정보 소자에 대한 복합 정보를 요구하는 응용에서는 개별적인 시스템에 질의를 한 후 결과를 조합해야 하는 부담이 있다. 본 논문에서는 물품의 식별 정보, 센서 및 위치 정보를 포함하는 지오센서 태그 데이터에 대한 효율적인 처리를 지원하기 위한 다양한 물류 환경의 정보와 질의 조건의 특징을 분석하며, 분석된 내용을 바탕으로 데이터 모델링을 제시한다.