• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
• /
• v.11B no.4
• /
• pp.151-155
• /
• 2001

The simple motor construction and low cost, fault tolerant power electronic drive has made the switched reluctance drive a strong contender for many applications. But the switched reluctance drive does exhibit higher levels of vibration and acoustic noise than that of most competing drives. The main source of vibration in the switched reluctance drive is generated by rapid change of radial magnetic force when phase current is extinguished during commutation action. In this paper, a hybrid excitation method is proposed to reduce vibration and acoustic noise of the switched reluctance drive. The hybrid excitation has 2-phase excitation by long dwell angle as well as conventional 1-phase excitation. The vibration and acoustic noise are reduced because the scheme reduces abrupt change of excitation level by distributed and balanced excitation.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
• /
• v.5B no.2
• /
• pp.129-136
• /
• 2005

This paper presents a design strategy of SPOKE type BLDC motors considering an irreversible demagnetization of a permanent magnet (PM). So the irreversible demagnetization characteristic of the motor is analyzed by rotor structure. The instantaneous currents in either starting or lock rotor condition, which are calculated from the current dynamic analysis, are applied to the analysis of the irreversible demagnetization field by FEM. In irreversible demagnetization analysis by FEM, the variation of residual flux density in PM is analyzed using the non-linearity of magnetic core on B-H plan. The analysis results are compared to several rotor structures and used for optimize the rotor structure.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
• /
• v.5B no.3
• /
• pp.267-271
• /
• 2005

This paper deals with two kinds of novel shape switched reluctance motors (SRM) with magnetic barriers in order to improve operating performances of prototype. The magnetic barriers make rotor poles more saturated, and consequently inductance profiles are distorted. The changed inductance affects input current shape and eventually torque characteristics. In order to analyze the complicated flux pattern of the SRM with magnetic barriers and its terminal characteristics simultaneously, coupled field circuit modeling method is used. The finite element method is used to model the nonlinear magnetic field, and coupled to the circuit model of the SRM overall system. After experimental results are presented to prove the accuracy of the method, the several analysis results are compared, and the improved rotor shape is presented.

• Convergence Security Journal
• /
• v.8 no.3
• /
• pp.51-56
• /
• 2008

Is caused by with growth etc. of the digital contents circulation market which leads suddenly accommodates in order to control the network traffic which increases and the researches which are various are being advanced the explosive evidence and a electronic transaction of the Internet user. The present paper protects a digital contents and a copyright from CDN system environments which will appear the center of new network service with the plan for the dispersive DRM system of CDN bases plans. Respect this dispersion DRM package formats which provide a stronger security characteristic in the contents which is stored the operational process of the dispersive DRM system for to be defined, CDN system and of existing interoperability they present.

• Journal of Arbitration Studies
• /
• v.20 no.1
• /
• pp.67-85
• /
• 2010

On-line ADR is to use means of settling disputes online to settle disputes happened on-line or off-line. It gave important opportunity for engaging in a commercial transaction to small group or individual. If it uses judiciary proceeding, it will cost too much, complicate and take considerable time. So, because of these reasons, OECD even encourage on-line ADR as a mean for relieving consumer's damage actively on e-commerce. Korea is also trying to introduce on-line ADR partially or completely in Korea Consumer Agency, The National IT Industry Promotion Agency, The Korean Commercial Arbitration Board. However, Korea's on-line ADR is more insufficient than advanced country's. Nevertheless, because on-line needs to introduce, this study suggests the problem and plan centering the type and the present condition of on-line ADR.

• Proceedings of the Korean Society for Information Management Conference
• /
• 2002.08a
• /
• pp.89-97
• /
• 2002

정보사회의 새로운 유형인 "컴퓨터정보"(computer information)를 계약의 객체로 삼는 무체물(intangibles)의 거래에 적용되는 법은 아직까지는 명확하지 않다. 즉, 컴퓨터정보가 수반되는 무체물의 라이센스거래에 있어서는 그 거래객체가 유형의 물품이 아닌 무형의 지적재산이라는 점에서 기존의 거래에 있어 중심이 되어 온 물품매매와는 다른 법제적인 접근이 필요한 바, NCCUSL에서 UCITA을 제정하였다. UCITA는 "컴퓨터정보거래에 관한 상계약법전"이며, "컴퓨터정보"가 수반되는 새로운 유형의 거래를 규정하기 위한 법안으로 계약을 다루는 법이지 재산권을 다루는 법은 아니다. 이러한 UCITA에 대응하는 우리 국내법은 없다. 따라서 본고에서는 향후 급증할 것으로 예상되는 컴퓨터정보거래에서 법률관계의 안전성·예측가능성의 제고 측면에서 가칭 "전자정보거래법"의 입법에 앞서 몇 가지 시사점을 제시하고자 한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.11a
• /
• pp.124-126
• /
• 2005

무선 인터넷을 이용한 전자상거래가 증가함에 따라 모바일 환경에서 전자상거래를 보다 안전하고 효율적으로 사용할 수 있도록 SET/A (Secure Electronic Transaction Agent) 프로토콜이 제안되었다. 본 논문에서는 키 노출에 따른 보안 취약점을 분석이 아닌 프로토콜의 행위적 관점에서 SET/A를 정형 명세하고 무선망 접속 불량이나 에이전트 동작 실패와 같은 오류 상황에 의해 교착 상태에 빠지지 않는지 정형 검증하였다. 그 결과 SET/A가 교착 상태에 빠질 수 있음을 확인하였고 확장된 SET/A 프로토콜을 제안하고 검증하였다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.11a
• /
• pp.133-135
• /
• 2005

CEPS(Common Electronic Purse Specification) 전자지갑 규제 표준을 기반으로 한 전자상거래서비스의 요구사항 및 시장성이 점차 큰 비중을 차지하고 있다. 전자지갑의 전자화폐 충전기능은 물품기능 만큼 매우 중요한 안전 필수 요구사항이다. CEPS에서는 LSAM (Load Secure Application Module) 기능을 통해, 전자금액 충전기능을 담당하도록 정의하고 있다. 전자지갑 본 논문에서는 전자지갑의 전자금액 충전기능을 설명하였다. 그리고 정형기법을 이용하여 CEPS 전자지갑 표준에서 정의한 전자금액 충전기능을 정형명세 및 정형검증 하여, 전자상거래시 발생할 수 있는 취약점을 확인하고 분석하였다.

• International Commerce and Information Review
• /
• v.5 no.1
• /
• pp.63-83
• /
• 2003

This paper's objective is to provide insights about the problems and expansion strategies of electronic trade. Korean small and medium-sized firms have adopted the Internet since the end of 1990s in order to reshape their competitiveness, and it is now being utilized as a major export marketing instrument to develop new customers, save export transaction costs ad facilitate new work processes. However, at present, the use of the internet in the field of trading is limited to the collection of market information, owing to legal, technical and institutional restraints between countries. In addition to that, because firms have the difficulties in making the trade contract through the e-trade system, the negative recognition on its' utility has been spreaded gradually between companies. This is one of the barriers to block the expansion of e-Trade between Korean firms. Therefore, this paper points out the problems of e-trade in the environmental, institutional and strategic view and provides many considerations for establishing the expansion strategy of e-trade by the Korean government and trade supporting institutions.

• The Journal of Society for e-Business Studies
• /
• v.6 no.3
• /
• pp.101-113
• /
• 2001

Security is very important in EC(Electronic Commerce) environment because exchanged information(that is transaction details, private data, charges data(card-no, accounts), etc) is various and is very sensitive. So, In this paper, we propose Secure-ReXpis(Reliable St excellent Xh3 Processing Infrastructure) System that transfer message and support Message Level Security(Encryption/Decryption and Digital Signature). And we implement Message Confidentiality Service, User Authentication ＆ Message Integrity Service and Non-Repudiation Service among the various Security Services. This system support XML message format and EDI message, WEB Data and Private Format Data, etc.