• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.9
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• pp.2253-2265
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• 2012

A novel folded dipole type microstrip patch antenna designed for ultrahigh frequency (UHF) band radio frequency identification (RFID) tag is presented in this paper, which can be used on the metallic objects. The presented antenna is fabricated on a very thin Rogers 5880 substrate with a thickness of 0.508 mm. The structure consists of two folded dipole and two symmetrical shorting pins placed at both sides of feed point. An adjustable frequency response can be easy obtained via modify the location and radius of the shorting pins. The antenna has been analyzed by full wave simulations soft. The simulated bandwidth is about 67.2 MHz, which covers the Europe and North America UHF RFID frequency range. A manufactured prototype has been fabricated and measured to demonstrate the antenna performances. The simulation results agree with the measurement data well. The measured maximum reading range of the prototype can be reached 4.1 m in free space, and 3.2 m on a metal plate whose size is $150{\times}150{\times}8mm^3$.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.674-675
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• 2016

In this paper, we propose a manufacturing process model of Internet of Things devices using a Printed Circuit Board (PCB)-mounted RFID tag chip for reducing electronic wastes. Electrical and electronic products require a PCB surface mount and many examination. Also, conventional barcode systems cannot provide traceability management in PCB manufacturing before finishing Surface Mount Technology (SMT) process. The proposed process model does not require workers' attaching and detaching process unlike barcode systems. Also, RFID tag chip can record all the data in manufacturing steps. Thus, the number of connections to a database management system (DBMS) can be reduced.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.12
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• pp.1367-1372
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• 2015

In this paper, we embed RFID tag into name plate of pole and store key value at its RFID tag in order to solve the problem for the management of name plate of pole, which identify by eyes of human for until now. The 900MHz RFID reader performs identification for stored key value, then its key value transmit into smart phone through Bluetooth. The smart phone transmit the key value into server through data communication network and receive again the necessary information after the authentication by the server. We develop pole information system that have such a structure.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.3
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• pp.288-293
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• 2010

In these information-communication society, the wireless system technologies are increasing to do all things with wireless solution for fast and convenient works. This trend drives ubiquitous solutions which are based on broadband wireless network that gives network connection whenever, everywhere. This paper deals a bookshelf management system using plower line communication and RFID module. This system includes a 900 MHz RFID reader, Passive RFID-Tags, an Atmeg128 microprocessor board attached LED Display Module, and a management PC with GUI Software. This system works well in power line communication, tag reading and LED display, and PC Management Software.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.705-705
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• 2006

• Proceedings of the Korean Information Science Society Conference
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• 2007.10a
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• pp.17-18
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• 2007

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.151-153
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• 2002

전자문서교환(EDI, Electronic Data Interchange)은 기업과 기업간에 컴퓨터와 컴퓨터의 통신을 통하여 필요한 거래문서를 구조화된 형식으로 교환하여 업무를 처리하는 방식을 말한다. 그동안 EDI 표준은 북미를 중심으로 한 ANSI X.12를 시작으로, 이에 대웅되는 유럽중심의 UN/CEFACT 표준이 제정되었다. UN/CEFACT로 표준을 통합하기로 합의한 양대 표준은 또 다른 XML환경을 접하게 되었다. ISO TC154에서는 UN/CEFACT전자문서의 XML변환에 관한 논의하게 되었으나 표준으로 권고되지 못하고 있는 실정이다. 이런 표준간 연동의 문제를 위하여 본 논문에서는 Speaking Tag방식과 UN/CEFACT Tag방식의 두가지를 제안하며 각각에 대해 변환규칙을 제안한다.

• 한국IT서비스학회:학술대회논문집
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• 2009.05a
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• pp.513-517
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• 2009

본 논문에서는 UHF대역의 그동안 문제로 되어왔던 일반 태그들의 금속 환경에서의 인식률 저하문제를 태그 패키징(Packaging)을 통해 개선하고자 한다. 다양한 환경에서 실험을 통해 일반태그와 패키징 태그의 인식률의 차이를 실험을 통해 비교해 보았다. 실험결과를 토대로 금속 환경에서 패키징 태그들을 실험 할 수 있는 최적의 태그 실험환경을 구성하여 태그들을 산업현장에서의 테스트와 같은 결과들을 도출하고자 한다.

• Journal of Electrical Engineering and Technology
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• v.13 no.1
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• pp.501-512
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• 2018

Radio frequency identification (RFID) sensor tag provides several advantages including battery-less operation and low cost, which are suitable for long-term monitoring. This paper presents a self-powered RFID temperature sensor tag for online temperature monitoring in substation. The proposed sensor tag is used to measure and process the temperature of high voltage equipments in substation, and then wireless deliver the data. The proposed temperature sensor employs a novel phased-locked loop (PLL)-based architecture and can convert the temperature sensor in frequency domain without a reference clock, which can significantly improve the temperature accuracy. A two-stage rectifier adopts a series of auxiliary floating rectifier to boost its gate voltage for higher power conversion efficiency. The sensor tag chip was fabricated in TSMC $0.18{\mu}m$ 1P6M CMOS process. The measurement results show that the proposed temperature sensor tag achieve a resolution of $0.15^{\circ}C$/LSB and a temperature error of $-0.6/0.7^{\circ}C$ within the range from $-30^{\circ}C$ to $70^{\circ}C$. The proposed sensor tag achieves maximum communication distance of 11.8 m.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.20 no.8
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• pp.694-700
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• 2009

In this paper, we propose a RFID tag antenna with low performance degradation due to nearby dielectric materials. The proposed antenna is designed to be appropriate for ink printing fabrication. The antenna is designed to operate in UHF band of $860{\sim}960$ MHz. The antenna uses a T-matching network in the middle of the main body and two parasitic patches in vicinity for complex conjugate matching with a commercial tag chip. In addition, the two parasitic patches induce currents at different dielectric constants of nearby dielectric materials. This can minimize the performance degradation due to nearby dielectric materials. The measured results show the half power matching bandwidth from 844 MHT to 1,268 MHz. It exhibits the reading distance of about 3.5 m in free space when the tag antenna is used with the commercial reader antenna (transmitting power of 20 dBm and the reader antenna gain of 6 dBi). When the tag is attached on dielectric materials of wood and FR4, the resulting reading distances are 2.61 m and 2.51 m, respectively.