• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술대회 논문집 전문대학교육위원
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• pp.117-119
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• 2003

Recently, Radio Frequency Identification (RFID) cards have been charming increasing attention. In addition, the RFID card ensures high durability and ease of maintenance because it has no built-in contact. And the benefits of RFID cards over contact cards are primarily due to the increased transaction speed and convenience brought to the cardholder. In this paper, we have developed a RFID card reader for the multi-purpose applications. The vicinity card reader with large-screen to display user ID and card number for a kinds of applications such as entrance and attendance management system is suitable for the use with EM card and TEMIC card, featuring easy to mount and reliable quality. The read range of the proposed RFID card reader is 70cm. This paper also addresses current RFID technology in terms of systems and provides a look forward its future applications in the aviation environment using RFID smart card.

• 한국산학기술학회논문지
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• 제18권10호
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• pp.131-135
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• 2017

본 논문에서는 라즈베리 파이를 적용하여 시각 장애인들을 위한 휴대용 카드 리더기를 개발하였다. 국내에서는 장애인들을 위한 생활보조기구 개발이 미비한 상태이다. 세계적으로도 장애인들을 위한 생활보조기구가 미약했으나 최근에 IT, 스마트폰, 사물 인터넷, 3D 프린터 등의 개발로 점점 장애인들을 위한 생활 보조 기구들이 개발되고 있다. 시각장애인들을 만나서 설문한 결과 현재 개발된 스마트폰 앱을 이용한 카드인식기능은 스마트 폰의 화면을 시각장애인들의 손으로 인지할 수 없고 작동하기도 불편하다고 입을 모았다. 근래에 시각 장애인들이 카드인식을 가능 하도록 하는 기기들이 외국에서 연구되고 있고 시제품으로 나오고 있는 실정이다. 그러나 현재 상용되는 휴대용 카드 리더기들은 가격이 높고 편리성이 떨어진다. 또한 시각장애인들은 취약 저소득층이 대부분이어서 값 비싼 기기들을 구입하여 사용하기가 힘들다. 본 연구에서는 시각장애인들이 저렴한 가격으로 사용하기 편리하도록 사물인터넷에 적용 가능한 오픈소스 하드웨어인 라즈베리 파이를 이용하여 자기스트립 리더(Magnetic strip reader)와 IC칩 리더(IC chip reader)로 카드를 인식하고 음성과 진동을 통해 알려주는 카드리더기를 개발하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(5)
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• pp.199-202
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• 2000

RFID (Radio Frequency Identification) is a technique which is used for identifying different types of objects and tracking people and animals. Passive RFID consists of reader, a passive tag. The reader transmit energy to a tag and read information back from tag. The tag is energized by a carrier frequency which is transmitted by the reader and transmit information back to the reader. In this paper, the circuit for read and write RFID system is presented. The presented RFID system adopts 125kHz carrier frequency, backscattering and PSK for communication method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 A
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• pp.35-42
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• 2003

We have studied DC energy conversion of RF card by wireless communication. In order to attain an objective, it used the system which is a Rectenna. The main purpose of energy conversion system is the operation of the circuits at RF-ID system. The proposed RF-ID system is a lot classified with the reader and tag. Reader is a kind of the base station role supporting RF energy. And priority tag convert RF energy from the reader it was delivered with a wireless to DC energy. The energy which is converted like Tag. It transmits to the reader characteristic ID of each card. The tag is mainly divided into rectifier, power module, memory and controller. The FRAM maintains the data like a ROM in no-power situation. And the advantage is a low power element compared with other EEPROM. There are two considerations, when RF energy is converted into DC source by wireless. One is energy amount supported from the reader, the other is high power efficiency. This paper presents a study of simulation and experiments on the RF-DC conversion circuit in tag by the power efficiency concentrated.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.217-219
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• 2004

In recent years, the smart card is wifely applied for wireless communication, tracking, transportation logistics, diagnostic monitoring, access control and security. RF-ID system is universally applicable. Passive RF-ID system consists from reader and passive tag. The reader transmits energy and simple information to a tag by wireless and the power from the reader is transformed for controller, FRAM and Bluetooth module. in this paper, an analysis and design of smart card for the transmission of the car movement data is presented.

• 한국정밀공학회지
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• 제19권12호
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• pp.100-108
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• 2002

This paper describes the development of adult authentication system using numerical recognition. Nowadays, the automats are very popular and they are dealing in many item suck as coffee, soft drinks, alcoholic drinks and cigarettes, etc. Among these items, some are harmful to the minor, and so the sale of these to the minor must be prohibited. In relation to this, adult authentication system is required to be equipped to the automat which deals in items harmful to minor. According to these demands, we develop the adult authentication system. This system capture the image of a residence certificate card by the identification card-reader, and recognize its numbers and identify it as adult or minor by main computer, where numeral recognition is accomplished by using image processing methods and neural network recognizer. The characteristic test of the system is carried out, and its result reveals that the system has the error of less than 1%. Thus, It is thought that the system can be used for identifying adult in the automats.

• 한국컴퓨터정보학회논문지
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• 제21권1호
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• pp.101-105
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• 2016

After a weight-rate disposal system for food waste has been implemented we have to install the food waste system at all apartment. In this paper, we supplied electric energy to the food waste system using solar heat panels. The weight of the food waste is displayed on the LCD panel, and its price is calculated based on its weight. Since there would be some cases that touch-typed card can't be well recognized if it is contaminated by foreign material, we designed a recognition device by no-touch sensitive card reader to embody the food waste system. The food waste system was designed using a GUI(graphical user interface) so that users can easily understand it.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(3)
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• pp.165-168
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• 2002

This paper has been designed and implemented of web security system using RF card A security mechanism that was proposed in this paper provides web services on card reader reads RF card of user only. In this paper, user authentication and server authentication was provided by challenge/response mechanism. Also, this system was provides confidentiality of communication messages.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -2
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• pp.583-586
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• 2000

A passive RF smart card incorporating a non volatile memory element is powered by inductive coupling to a proximately located RF reader. Therefore, the power consumption in the smart card should be low. In this study, we designed the low power passive RF smart card that is operated at 125kHz to apply to the subway ticket system.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 가을 학술발표논문집 Vol.31 No.2 (3)
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• pp.385-387
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• 2004

최근 지하철이나 버스 등의 교통수단을 이용하기 위해 비접촉식 카드를 이용한 IC카드 Reader가 많이 사용되고 있다. 이러한 IC카드 Header는 ID를 인증하기 위한 UserID를 Reader내부에 저장하고 있으며 UserID가 바뀔 때 마다 상위 시스템(서버)으로부터 전송받아 최신의 UserID를 가지고 있어야 한다. 교통시스템에서 사용되는 통신매체는 환경의 특수함으로 인해 낮은 전송속도를 이용하여 통신하고 있고, 그로인해 UserID를 전송할 때 시간이 많이 소모된다. UserID를 전송하는 동안에는 IC카드 Reader의 사용이 제한되기 때문에 UserID는 IC카드 Reader가 사용되지 않는 시간에 전송하고 있다. 많은 양의 UserID를 IC카드 Reader에 빠르게 전송하기 위해 UserID의 특성을 이용한 엔코딩(encoding) 기법을 적용 하여 UserID의 크기를 줄여 전송함으로써 전송시간을 줄이는 방법을 제안하였다.