• Proceedings of the Korea Contents Association Conference
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• 2004.11a
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• pp.377-383
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• 2004

In this paper, we propose an application model of RFID that needs not be worried about battery degradation problems and offers convenience of hand-carry. We design the RFID application model which can track medium distance target RFID Tag and detect the signal difference between multi-detectors in a room area using 900MHz frequency band. In the case of multi-ID Tag in one detector, we approach TDMA scheme.

• Annual Conference on Human and Language Technology
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• 2005.10a
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• pp.167-172
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• 2005

지금까지 자연언어처리에서의 품사태깅(parts-of-speech tagging) 기술에 대한 연구는 활발히 진행된 반면, 전문용어에 대한 처리 기술은 미비한 점이 많았다. 전문용어에 관련된 연구는 대부분 구축, 표준화, 추출 등에 대한 연구가 많았으나 전문용어 태그 설정과 태깅 기술 연구는 부족한 상황이다. 본 논문에서는 전문용어 태그를 (분야정보: 아이디) 순으로 설정하고 백과사전의 분류 체계를 이용하여 어떤 특정 분야 문서의 전문용어를 자동으로 태깅하는 시스템을 구축하였다. 전문용어 태깅 시스템은 형태소분석기를 사용하지 알고 문맥의 규칙과 조사 어미사전을 이용해 자동으로 태깅을 하게 된다. 이 시스템의 정확률 측정을 위한 정답말뭉치는 웹 상에 공개되어 있는 백과사전 html문서를 이용하였다. 우선 백과사전에 나와있는 용어는 전문용어라고 가정한다. 하나의 문서에는 '용어', '요약', '본문', '이미지', '분류', '참조항목' 등의 정보들이 있다. 이 중 '본문'에는 그 용어에 대한 자세한 설명이 있는데 특정 단어에는 태그로 백과사전 내에 있는 단어를 찾아 볼 수 있게 링크 되어있다. 이 정보를 이용해 태그로 되어있는 것을 설정한 태그로 바꾸고 단계별로 확장 태깅을 해서 정답말뭉치를 만든다. 태깅 시스템과 정답말뭉치를 비교해 정확률을 계산해서 시스템의 성능을 측정하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.5
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• pp.871-885
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• 2015

The improved DFSA for 2.4GHz multi-tags active RFID is suggested in 2 different ways: 1) simplified tag collection and Ack procedure using query command and 2) modified Schoute's method to control the number of slots in the frame. To evaluate the performance of the improved system we develop the simulation model. Varying the number of tags in the system we track the performance measures such as throughput, recognition time for multi-tags and tag recognition rate during a given time. The suggested method shows the best performance over all measures. Simplification of collection and Ack commands using query commands contributes to reducing tag recognition time. And the modified Schoute's method which controls the frame size using $k_1$ and $k_2$ contributes to throughput improvement and reduces target cognition time by reducing the number of collection rounds.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.434-437
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• 2006

Today, Hospital Information System that integrates ubiquitous technologies are introduced in limited basis due to problems like standardization and limits on medical use, where responsibilities lie, legal safeguard on transmission, invasion of privacy etc. Particularly, problems like absence of tag design suitable for medical environment, compatibility issue with previous medical information system. In order to solve such problems, we have designed medical tags for the first time that are consistent with future ubiquitous environment by deciding on medically suitable field with 96bit tag offered by EFC as its base. Second, improving on previous multi-tag recognizing crash prevention algorithm, we have designed a priority anti-collision algorithm that reflects priorities on the needs in medical environment.

• The KIPS Transactions:PartD
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• v.12D no.3 s.99
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• pp.439-446
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• 2005

XML is the standard that can manage systematically WWW documents and increase retrieval efficiency. Because XML documents have the information of contents and that of structure in single document, users can get more suitable retrieval result by retrieving the information of content as well as that of logical structure. In this paper, we will propose a method to calculate the weights of XML tags so that the information of XML tag is used to index decision. A proposed method creates term vector and weight vector for XML tags, and calculates weight of tag by reflecting user's retrieval behavior (user's query). And it decides the weights of index terms of XML document by reflecting the weights of tags. And we will perform an evaluation of proposed method by comparison with existing researches using weights of paragraphs.

• The Journal of the Korea Contents Association
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• v.9 no.9
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• pp.9-17
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• 2009

RFID (Radio Frequency Identification) is a next generation technology that will replace barcode. RFID can identify an object by reading ID inside a RFID tag using radio frequency. However, because a RFID tag replies its unique ID to the request of any reader through wireless communication, it is vulnerable to attacks on security or privacy through wiretapping or an illegal reader's request. The RFID authentication protocol has been studied actively in order to solve security and privacy problems, and is used also in tag search. Recently, as the number of tags is increasing in RFTD systems and the cost of data collection is also rising, the importance of effective tag search is increasing. This study proposed an efficient search method that solved through ta9 group the problem of large volume of database computation in Miyako Ohkubo's hash chain mechanism, which meets requirements for security and privacy protection. When we searched first the group of tags with access rate of 5 or higher in a database with 100,000 records, search time decreased by around 30%.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.2
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• pp.119-126
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• 2011

In this paper, we expect that the IEEE 802.15.4a, which is based on CSS, will be used a lot without getting help from other systems or sensors and will make it possible to measure the distance between radio chips in sensor network field, where the location information of the standard have to be based upon. But, the error rate will be high, so we will correct the location of the tag, which will be received by anchor. The technology of location correction we offer is reducing the error rate through calculating the distance from Compensation Tag, and after that, unite the Toa method with the Fingerprint method and adapt them to location correction technology, calculate the location's estimate, and finally abstract the best suited location estimate for Compensation Tag. At last, we offer developing systems as indoor systems of CSS, which pursue the location between nodes, and a thesis about indoor systems and making their accuracy higher.

• 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 Korea Information Processing Society Conference
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• 2017.04a
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• pp.1051-1053
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• 2017

누구나 놀이공원을 한번쯤 가보면 인기 있는 놀이기구를 몇 시간에 걸쳐 기다렸던 경험이 있을 것이다. 그에 따라 많은 시간이 낭비되고 피곤함도 크게 증가한다. 따라서 이용객의 불편함을 해소하고자 한다. 본 연구에서는 NFC 태그를 활용한 어플리케이션을 개발하여 불필요하게 줄 서서 기다리는 시간을 줄이려 한다. 본 어플리케이션에는 놀이기구 탑승을 위한 알림메시지가 있기 때문에 줄 서서 기다리지 않고 각 놀이기구 마다 설치된 NFC 태그에 터치하는 것으로 기다리지 않고 탑승하여 알림메시지에 따라서 예약 탑승객들이 우선 탑승할 수 있다. 이러한 효과로 이용객에게 편리함을 제공하며 공원 입장에서는 고객의 충성도가 증가하므로 재방문율이 증가하는 효과, 놀이기구 이용 회전율이 증가하는 효과를 기대할 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.262-264
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• 2005

Radio Frequency Identification(RFID)시스템은 객체에 부착된 RFID 태그를 리더로 읽어 들여 정확하게 객체를 인식할 수 있어 상황 인지를 위한 중요한 정보를 제공할 수 있다. 그러나 태그와 리더간의 통신이 단일 홉으로 구성되어 있기 때문에 대상 지역의 전체를 인식하지 못하여, 상황인지를 위한 총체적 정보를 제공할 수 없는 문제를 가지고 있다. 본 논문에서는 최근 제안되고 있는 무선 센서 네트워크와 RFID 시스템의 결함을 통하여 RFID시스템이 대상 지역 전체를 인식할 수 있게 하고, 이 정보를 센서 네트워크의 센싱 정보와 함께 활용하여 지능적인 상황 인지가 가능한 RFID 기반 우선 센서네트워크의 지능적 상황 인지 지원 시스템을 제안한다. 제안된 시스템에서는 RFID 시스템의 객체 인지 능력을 활용할 수 있을 뿐만 아니라, RFID 시스템에 네트워킹 기능을 제공하여 지능적 상황인지를 가능하게 한다.