• International Journal of Internet, Broadcasting and Communication
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• v.9 no.3
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• pp.35-43
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• 2017

In 2013, Lee-Lie proposed secure smart card based authentication scheme of Zhu's authentication for TMIS which is secure against the various attacks and efficient password change. In this paper, we discuss the security of Lee-Lie's smart card-based authentication scheme, and we have shown that Lee-Lie's authentication scheme is still insecure against the various attacks. Also, we proposed the improved scheme to overcome these security problems of Lee-Lie's authentication scheme, even if the secret information stored in the smart card is revealed. As a result, we can see that the improved smart card based user authentication scheme for TMIS is secure against the insider attack, the password guessing attack, the user impersonation attack, the server masquerading attack, the session key generation attack and provides mutual authentication between the user and the telecare system.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.329-330
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• 2008

제주-해남간 HVDC 변환설비는 제주 전력수요의 약 40%를 담당하는 주요 설비로, 국내에서는 처음으로 도입되어 상용 운전중인 직류송전 설비이다. 10년간의 변환설비 운전중에 크고 작은 고장이 많이 발생하였으며 PCB Card에 의한 고장은 전체 고장의 약 30%를 차지하고 있다. 본 논문에서는 해남변환소에서 사용중인 VBE (Valve Base Electronics : Thyristor 점호 제어반) Cubicle에 설치된 Databack PCB Card 점검장비 개발내용을 설명하였다. 이 장비 사용시 설비사고 및 고장의 원인을 줄일 수 있고, 카드의 연도별 이력관리를 할 수 있다. 또한 Card의 경년열화 특성을 파악하여 교체시기를 판단할 수 있고 Card 시험시간의 단축이 가능하다. 상기 이외에 점검기술에 대하여 기존 방식과 비교하고 시험기 개발 및 운영사항에 대하여 기술하고자 한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.1
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• pp.115-122
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• 2004

This paper describe the implementation or the boot loader for the boot system using of memory card. This boot roader consist of the system initialization, CF card checking, CF memory card checking, file system and the program relocator. This boot loader increase the system stability with program consistency checking algorithm in the read phase from the CF memory card. And this system have the compatibility in CF memory card file system, so system manufacturing productivity increase.

• Journal of Korea Society of Digital Industry and Information Management
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• v.14 no.3
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• pp.87-101
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• 2018

Minors' law evasion is getting serious. Some of them make a fake ID card or use a stolen ID card illegally. They are illegally used for buying alcohol, cigarette, bond or going to club, pub, motel and so on. On the latest News, there was a case that teens rented a car with a driver licence without checking and had severe car accident. Like this case, car rental service was fined and suspended from business because they did not figure out ID card's counterfeit or modification. Thus, this study investigates the detecting method about the ID card(including a driver license) counterfeit, modification or illegal use. The server has a database of 17~19's minors one fingerprint and services whether the visitor is adult true or not. The method will be usable and economical for business. Then, it was compared and analyzed with methods already in use in business.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1155-1158
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• 2002

SIM 카드는 개인식별을 위해 GSM 단말기에 내장되는 스마트 카드의 한 종류이다. 그러나 기존의 SIM 카드는 어플리케이션을 업그레이드하거나 추가하기가 쉽지 않고 어플리케이션이 하드웨어에 종속적인 단점이 있어 SIM 카드의 활용범위를 좁히는 결과를 가져왔다. 본 논문에서는 이러한 단점을 해결할 수 있는 대안으로 제시되고 있는 Java Card와 Java Card 기술을 알아보고 이러한 Java Card 기술을 SIM 카드에 적용하기 위하여 필요한 Java Card SIM API에서의 Toolkit Registry에 대한 구현 내용을 기술한다.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.375-378
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• 2002

This paper describes tile design and implementation of contact and contactless If card OS(Operating System) for Java Card, namely JCOS(Java Card 05). The JCOS complies with ISO/IEC 7816 and IS0/1EC 14443 standards. The JCOS conforms to Java Card 2.1.2 specifications. The JCOS is running on 32-bit ARMTTDMI with public key crypto-coprocssor. This paper describes only the dual-interface protocol of the JCOS which supports contact and contactless applications in a single chip. The JCOS has been completed with our sample banking service and access control service in ETRI up to now.

• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.335-338
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• 2012

교통카드는 1996년 충전방식의 선불카드가 처음 사용되었고, 후불방식의 교통카드는 1998년 6월부터 도입되어 함께 사용되었다. 교통카드 사용할 수 있기 위해서는 사용자의 사용여부 및 각종 신상정보의 변경에 따라 결제방식이 변경되는 것에 대해 카드거래 승인시스템에 적절한 반영이 필요하다. 이를 위해 기존 서울교통시스템에서는 메모리 주소를 이용한 카드거래승인시스템을 이용하고 있으며 본 연구에서는 임베디드 교통카드단말기에서 사용 가능한 오프라인 카드거래 승인 알고리즘을 개발하는 것을 목표로 한다. 본 논문에서는 카드 사용정보를 압축 저장하는 방식을 제안하고 있으며, 사용자 할인정보는 한 카드당 2bit의 공간을 차지하도록 설계 했다. 또한 검색알고리즘으로 이진탐색을 사용하여 기존에 비해 검색 속도가 향상 되었다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.5
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• pp.762-767
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• 2002

In this paper, We suggest Credit Card and On-line Financial Business Method Using on Wireless Terminal. First, wireless mobile terminal of credit card member is received suity code from dealing verification system of credit card company. Second, a credit card member give security code to member store. Third, the security code is compared with security code of the member in dealing verification system of credit card company.

• Journal of the Korea Society of Computer and Information
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• v.23 no.1
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• pp.49-55
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• 2018

In this paper, we propose a design and development of instructional cards to understand the grammar of coding, solving the problems and extending the computational thinking in the robot-driven environment. First, we designed the input/output module of the robot to process the coding grammar through the function analysis of the robot. And we designed the module of command card to learn coding grammar using color sensors. We have proven the validity of the designed instruction card by examining the experts to see if it is suitable for coding grammar learning. Designed robot and command card were developed with 28 cards and sensor robot. After applying the developed robot and command card to the elementary school students, the questionnaire showed that students grow the understanding and confidence of coding. In addition, students showed an increased need for programming learning.

• Journal of Korea Multimedia Society
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• v.10 no.8
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• pp.1029-1038
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• 2007

A smart card based on the existing Java card platform executes and installs an application only when the power is supplied for a minute. And preparing for unexpected power outrage, the execution state of an application and all the data that are modified during execution are saved in the heap. This kind of frequent data update of an EEPROM data is a main cause of reducing the life-cycle of a smart card. This is because the smart card has been developed not considering the current situation that the power is always supplied, and by this time it has continuously kept its old architecture. This paper explains the high performance Java card system free power restriction. The system improves not only application saving mechanism, but memory architecture. In special, we deploy RAM for running an applet, as well as EEPROM for downloading an application. Through proposed mechanism, we can find out performance evaluation that the creation speed of an applet and the execution speed of a method increase up to 58% and 33% respectively.