• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.818-823
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• 2006

유비쿼터스 시대가 본격적으로 진행되면서 센서 네트워크 및 RFID와 같은 유비쿼터스 기술이 생활 곳곳에 파고들고 있다. 본 연구에서는 유비쿼터스 기술을 활용하여 관광객들에게 박물관 및 관광 컨텐츠 등을 효과적으로 보여 줄 수 있는 방안을 제시하고 있다. 제안하는 시스템은 박물관 및 관광지 등에 RFID 태그를 장착한 대상물을 설치하고 사용자들이 RFID 리더기가 장착된 단말기를 이용하여 무선으로 컨텐츠 정보를 전송 받을 수 있도록 시스템을 설계하였다. 본 논문에서는 RFID 기술을 활용하여 다양한 컨텐츠를 손쉽게 처리할 수 있는 시스템의 설계 및 구현 과정에 대해서 기술하였으며, 실제 시험 환경에서 유용하게 동작하고 있음을 보이고 있다.

• Information and Communications Magazine
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• v.21 no.6
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• pp.102-115
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• 2004

IT 산업의 발전과 국가의 부 창출을 위하여 정부는 'IT 839 전략'에 따라 2010년까지 BcNㆍUSNㆍIPv6 3대 IT 통신 인프라의 전국 상용망 구축을 추진하고 있다. u-센서 네트워크(USN)는 모든 사물에 전자태그(RFID)를 부착, 인터넷에 연결하여 정보를 인식 및 관리하는 네트워크를 말한다. USN 서비스는 RFID, 텔레메틱스, 그리고 지능형홈 분야 등에서 유통, 물류를 비롯하여 교통, 농축산물관리, 조달, 환경, 의료 등 다양한 산업 전반에서 창출될 것으로 보인다 RFID 태그는 전자칩을 부차하고 무선통신 기술을 이용하여 리더와 통신한다 본 고에서는 정보보호 관점에서 RFID/USN네트워크가 인터넷 수준의 보안 서비스를 제공하기 위해서는 어떠한 점이 고려되어야하는지를 정리하였다. 현재 사회적으로 이슈가 되고 있는 RFID 정보보호 문제는 주로 프라이버시 측면에서 논의되어 왔다. 그러나 RFID/USN은 대규모의 RFID 태그(사물)들이 단말이 되고, IPV6, BcN 망과 연동되며, 새로이 구축되어야하는 네트워크임에도 불구하고, 아직 네트워크/서비스 정보보호 관점에서 고려해야할 것들이 무엇인가에 대한 논의가 활발하지 못했던 것으로 보인다 이러한 논지를 가지고 본 고에서는 현재 논의되고 있는 RFID 정보보호 기술의 동향을 분석하고, 네트워크 정보보호 관점에서 RFID/USN 환경에 추가되어야 할 기술적 요구사항들을 정리해 보았다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.01a
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• pp.485-486
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• 2023

4차 산업혁명 이전에도 많은 물류 자동화가 이루어지고 있었다. 그러나 4차 산업혁명이 도래하면서 자동화되는 범위가 더욱 넓어지며 인력이 쓰이는 곳에 로봇이 대거 등장하게 되었다. 그러나 환경이 열악한 중소기업이나 경제성 측면에서의 도입이 어려운 분야에서는 자동 물류 시스템의 적용이 어려운 것이 현실이다. 본 논문에서는 이러한 문제를 해결하기 위해 물건을 옮기는 일에 있어서는 라인트레이서를 이용하여 물품의 수송을 도와주고, 적외선 센서 및 바코드 리더기를 이용하여 물품 개수의 현황 계산을 담당하여 정확한 계산을 도출하여 자동으로 원격 데이터베이스에 저장하여 관리할 수 있는 물류관리 지원 시스템을 제안한다.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.8
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• pp.185-194
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• 2014

In this paper, we proposed the clothing management system using the smart hanger. Proposed system consists of smart hanger, base module, and server, and the smart hanger consists of MCU, LED, RFID reader, RF chip, ring sensor, and battery. The smart hanger reads the RFID tag attached to the clothes and wirelessly transmitted to the server. The server associated base module communicates with the smart hanger and transmits information to the server. The server manages clothing through the DB, and can display various information through the web page and the smart phone. In order to verify the usefulness of the proposed system, we did experiment with the management system for clothing store and laundry where using a lot of hangers. Performance tests of the smart hanger are applied to check the current consumption and can be predicted the battery life with the proposed low power algorithm. The clothing store management system can be increased sales and convenience of the consumer. The laundry management system can be increased the efficiency of laundry category and convenience of the consumer.

• 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.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.12
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• pp.1318-1327
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• 2012

With the recent increased risk of livestock disease spread and human infection, livestock disease control has become very important. Consequently, there has been an increased attention on an implantable real-time monitoring and traceability system for individual cattle. Therefore, we have developed a robust monitoring and traceability system based on an implantable MFAN/RFID sensor tag. Our design combines the MFAN technology that is capable of robust wireless communication within cattle sheds and the 900MHz RFID technology that is capable of wireless communication without battery. In MFAN/RFID implantable sensor tag monitoring system, UHF sensor tag is implanted under the skin and accurately monitors the body temperature and biological changes without being affected by external environment. In order to acquire power needed by the tag, we install a MFAN/RFID tranceiver on the neck of cattle. The MFAN coordinator passes through the MFAN node and the RFID-reader-combined MFAN/RFID transceiver and transmits/receives the data and power for the sensor tag. The data stored in the MFAN coordinator is transmitted via the internet to the livestock history monitoring system, where it is stored and managed. By developing this system, we hope to alleviate the problems related to livestock disease control.

• Journal of IKEEE
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• v.18 no.1
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• pp.57-63
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• 2014

This paper is to technically implement the sensing platform for Home-Wellness Robot. The self-Localization of indoor mobile robot is very important for the sophisticated trajectory control. In this paper, the robot's self-localization algorithm is designed by RF sensor network and fuzzy inference. The robot realizes its self-localization, using RFID sensors, through the collaboration algorithm which uses fuzzy inference for combining the strengths of triangulation and triangulation. For the triangulation self-Localization, RSSI is implemented. TOA method is used for realizing the triangulation self-localization. The final improved position is, through fuzzy inference, made by the fusion algorithm of the resultant coordinates from trilateration and triangulation in real time. In this paper, good performance of the proposed self-localization algorithm is confirmed through the results of a variety of experiments in the base of RFID sensor network and reader system.

• 전자공학회논문지 IE
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• v.46 no.3
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• pp.55-61
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• 2009

This paper describes an assistant system for elders who live alone. The developed system is composed of a wearable RFID system, a gateway system, and server system. The wearable RFID system is installed in glove. The wearable RFID system can be considered as a wireless sensor network which has a sink node and sensor node with a RFID reader. The sensor node can read RFID tags on the various objects used in daily living such as furniture, medicines, sugar and salt bottles, and ok. The sensor node transmits wireless packets to the sink node. The sink node sends the received packet immediately to a server system via a gateway system. The gateway provides users with audio-visual information of objects. The server system is composed of a database server and a web server. The data from each wearable RFID system is collected into a database, and then the data are processed to visualize the measurement of daily living activities of users. The processed data can be provided for someone who wants to know about user's daily living patterns in house such as family, caregivers, and medical crew.

• Spatial Information Research
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• v.19 no.3
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• pp.53-62
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• 2011

Spatial information services in indoor space are an im portant application area of GIS as in outdoor space. Unlike in outdoor space, a position in indoor space is specified by a symbolic code such as room number, rather than coordinate. Therefore tracking in indoor space is no longer a prediction of coordinates but a symbolic estimation on the current position of a moving object. In this paper, we propose a framework for tracking moving objects in indoor symbolic space with RFID sensors. First, we introduce the concepts of indoor symbolic space and tracking in indoor symbolic space, and define the accessibility graph for trackable indoor symbolic space. Second, we propose a deployment method of RFID readers and a construction algorithm of accessibility graph for trackable indoor symbolic space. Third, a tracking method is proposed for moving objects in symbolic indoor space with RFID sensors. Finally, we present an implementation exmaple and the result of experiment with real data to validate the proposed method.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.6
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• pp.215-221
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• 2011

Communication infrastructure of wireless sensor networks significantly tends to depend on application requirements. Gossip communication is becoming one of the promising solutions for addressing its scalability problems in providing information propagation functionality based on the P (publish)/S (subscribe) paradigm. In particular, despite the importance of both guaranteeing message delivery order required and supporting overlapping groups in sensor networks, there exist little research works on development of gossip-style dissemination protocols to satisfy all these requirements. In this paper, we present the latest causal information transmission protocol between publishers and subscribers for overlapping groups. In this protocol, sensor leaders as publishers might guarantee consistently causally ordered message delivery among themselves by aggregating causality information. On the other hand, only the latest causal information piggybacked on each multicast message is transmitted from publishers to subscribers through gossip-style dissemination. Its scalability feature might be highly suitable for the area of the applications requiring only the minimum meaningful information.