• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
• /
• 1997.11a
• /
• pp.221-231
• /
• 1997

본 논문에서는 고속 멱승을 위한 모듈라 곱셈기를 시스토릭 어레이로 설계한다. Montgomery 알고리듬 및 시스토릭 어레이 구조를 분석하고 공통 피승수 곱셈 개념을 사용한 변형된 Montgomery 알고리듬에 대해 시스토릭 어레이 곱셈기를 설계한다. 제안 곱셈기는 각 처리기 내부 연산을 병렬화 할 수 있고 연산 자체도 간단화 할 수 있어 시스토릭 어레이 하드웨어 구현에 유리하며 기존의 곱셈기를 사용하는 것보다 멱승 전체의 계산을 약 0.4배내지 0.6배로 감소시킬 수 있다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.22 no.10
• /
• pp.84-88
• /
• 2008

This paper deals with the part of the surge protection method of the underground distribution system in Korea using arrestors by simulating with ATP-EMTP(Electro-Magnetic Transient Program) based on the "A Study on the Surge Propagation Property of Underground Distribution Cables by Field Tests" which was published in 2007. Although domestic underground distribution system is protected by arrester which installed at a riser pole, we need to additional protection method because lightning surge can be doubled and affect underground distribution facilities when it is injected into the mixed distribution line of overhead and underground through a riser pole. In this paper, it is proposed that scout method that arresters are attached to the sides of a riser pole is better than developing of a elbow arrester on a viewpoint of economics and maintenance, because of the situation of the domestic underground distribution system.

• Journal of Practical Agriculture & Fisheries Research
• /
• v.11 no.1
• /
• pp.79-94
• /
• 2009

The research project was conducted to develop a paper bagging machine for grape. This technology was aimed to highly reduce a labor for paper bagging in grape and bakery. In agriculture labor and farm population has rapidly decreased since 1980 in Korea so there was so limit in labor. In particular there is highly population in women and old age at rural area and thus labor cost is so high. Therefore a labor saving technology in agricultural sector might be needed to be replaced these old age with mechanical and labor saving tool in agriculture. The following was summarized of the research results for development of a paper bagging machine for grape. 1. Development of a new paper bagging machine for grape - This machine was designed by CATIA VI2/AUTO CAD2000 programme. - A paper bagging machine was mechanically binded a paper bag of grape which should be light and small size. This machine would be designed for women and old age with convenience during bagging work at the field site. - This machine was manufactured with total weight of less than 350g. - An overage bagging operation was more than 99% at the actual field process. - A paper bagging machine was designed with cartridge type which would be easily operated between rows and grape branches under field condition. - The type of cartridge pin was designed as a C-ring type with the length of 500mm which was good for bagging both grape and bakery. - In particular this machine was developed to easily operated among vines of the grape trees. 2. Field trials of a paper bagging machine in grape - There was high in grape quality as compared to the untreated control at the application of paper bagging machine. - The efficiency of paper bagging machine was 102% which was alternative tool for the conventional. - The roll pin of paper bagging machine was good with 5.3cm in terms of bagging precision. - There was no in grape quality between the paper bagging machine and the conventional method. - Disease infection and grape break was not in difference both treatments.

• Proceedings of the KIEE Conference
• /
• 2006.07a
• /
• pp.101-102
• /
• 2006

345kV 변전소는 국내 전력계통의 근간으로서 고장 시계통 안정도에 미치는 영향이 크기 때문에 고장 제거가 착신하고 신속해야 한다. 따라서 345kV 변전소의 보호 장치들은 CT, PT, 차단기(trip coil), 보호계전기, DC전원 등이 모두 2계열화되어 있으며 보호 계전기는 각 계열마다 주보호와 후비보호가 따로 구비되어 있다. 본 논문에서는 34skv 변압기 보호용 보호계전기에 내장된 계전요소들의 유기적인 성능 검증을 할 수 있는 동특성 시험에 관한 기반 구축 과정 및 결과에 대해서 기술한다.

• 정보보호뉴스
• /
• s.138
• /
• pp.32-33
• /
• 2009

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.21 no.1
• /
• pp.35-41
• /
• 2007

Recently, there are increasing social needs for stable supply of electric power and securing high quality of information and communication services. In this work, to propose the effective protection countermeasures of information-oriented equipments against lightning surges, the protection effects of surge protective devices(SPDs) were experimentally investigated using actual-sized test circuits in various installation conditions. As a result, it was found that the protection effect of SPDs is quite different depending on the factors, such as the grounding system of power source, numbers of branch circuits, wiring method of grounding leads, and etc. In case of installing SPDs for information-oriented equipments, including all electric power lines and communication lines, the common grounding should be the most effective. Wiring method containing grounding leads with power lines in metal conduit is suitable to improve the surge cutoff performance of SPDs.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2009.10a
• /
• pp.339-341
• /
• 2009

Surge Protective Device(SPD) is installed by increasing information and communication equipments and home network equipments by individual home, and the amount of SPD used is increasing by revision industry regulations and strengthening equipotential grounding system. Parts of SPD installed in residential distribution board has ZnO varistor, voltage constraint type devices, but it is exposed to Temporary Overvoltage Characteristic. This thesis analyzes products through Thermal Stability test for SPD for general house and suggests the better method. As results of analysis, Gas Discharge Tube(GDT) to cut off from a leakage current and more than two kinds of safety devices to protect Thermal Runaway were needed.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.12 no.3
• /
• pp.87-94
• /
• 2002

This study presents an MSB(Most Significant Bit) Int multiplier using cellular automata, along with a new MSB first multiplication algorithm over GF($2^m$). The proposed architecture has the advantage of high regularity and a reduced latency based on combining the characteristics of a PBCA(Periodic Boundary Cellular Automata) and with the property of irreducible AOP(All One Polynomial). The proposed multiplier can be used in the effectual hardware design of exponentiation architecture for public-key cryptosystem.

• Review of KIISC
• /
• v.5 no.2
• /
• pp.90-96
• /
• 1995

Gollmann이 제안한 Cascade 생성기는 비선형성, 발생되는 수열의 난수특성, 주기성등 암호 알고리즘으로서 필요한 제반 특성을 보장하기 때문에 그동안 스트림 암호의 핵심 논리로 널리 사용되어 왔다. 그러나 최근 생성기 내부의 각 단계별로 시각 제어 수열과 출력 수열 사이에 암호 알고리즘으로는 부적당한 상관관계 특성이 존재함이 입증되었다. 본 고에서는 이러한 상관관계 특성을 이용하여,. 단순 순환 쉬프트 래지스터로 구성된 Cascade 생성기에 대한 기지 평문 공격 방식을 제안한다. 기존의 Lock-in effect 공격방식에 대하여 $10^{21}$ 정도의 안전성을 보장하는 8단계 11-cycle Cascade 생성기에 본 방식을 적용한 결과 불과 88,000 출력 비트만을 사용하여 공격이 성공함을 실험적으로 입증하였다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2012.04a
• /
• pp.631-634
• /
• 2012

디지털 복합기는 프린터, 복사기, 스캐너, 팩스 등의 장치가 결합되어 있는 임베디드 장치로써 출력, 복사, 스캔, 팩스 외에 네트워크 통신을 이용한 원격 유지보수, 다중 사용자가 맞물려 있는 장치이다. 이러한 디지털 복합기는 최근 기업 및 공공기관에서 업무의 효율성 증대와 경비절감을 위해 중요한 문서를 처리하는 장비로 널리 보급되고 있다. 하지만 산업 스파이나 공격자들에 의해 중요한 문서들이 외부로 유출되면서 기업의 피해가 증가하고 있다. 따라서 본 논문에서는 디지털 복합기에서 발생할 수 있는 다양한 보안 취약점 및 보안 위협을 기밀성, 무결성, 가용성, 부인방지 측면에서 분석하였다.