• Proceedings of the Korea Information Processing Society Conference
• /
• 2000.10a
• /
• pp.165-168
• /
• 2000

기존의 멀티캐스트 보안 프로토콜은 DVMRP, CBT와 같이 비교적 규모가 큰 라우팅 프로토콜에 적합하도록 설계되어 있어서 사용자가 비교적 적고, 호스트들간의 지역적인 거리가 멀고, 최단경로 라우팅 특성을 가시는 PIM-SM(Protocol Independent Multicast-Sparse Mode)라우팅 프로토콜을 지원하는데 무리가 있나. 본 논문에서는 모든 사용자간의 가입/탈퇴시 또는 서비스 사용 중에 사용자의 정당한 서비스 보호를 위해 서브그룹을 RP 단위로 나누고, 송신자만의 비밀키를 따로 관리하는 보안 구조를 설계하였다. 그 결과 데이터 전송시 그룹키에 의한 데이터 변환 작업이 불필요하여 키 분배시간이 단축되고, 다른 보안 구조에 비해 구조가 보다 간단해졌다.

• Journal of the Korean Society of Industry Convergence
• /
• v.15 no.2
• /
• pp.55-58
• /
• 2012

This study is concerned about the design and structural analysis of high integrated Chip Bonding Machine. Recently, many studies have been undergoing to reduce a working time in a field of Chip Bonding Machine. Chip Bonding Machine belongs to reduce a stand-by time by Chip Moving time. The developed system can save tool moving distance in small space than other machine. The analysis is carried out by SoldEdge & Ansys software.

• Journal of Applied Biological Chemistry
• /
• v.42 no.2
• /
• pp.92-96
• /
• 1999

To study the regulatory mechanism of isoprenoid (carotenoid) biosynthesis, we have compared the expression patterns of nine isoprenoid biosynthetic genes in Korean red pepper (Capsicum. annuum cv. NocKaung). The expression of geranylgeranyl pyrophosphate synthase gene was initially induced at early ripening stage (I1) and was rather slightly decreased during pepper fruit ripening. The ex-pression of phytoene synthase gene was strongly induced at semi-ripening stage (I2) and the phytoene desaturase transcript was maximally induced at the fully ripened stage (R). Our results suggest that genes encoding two 3-hydroxy-3-methylglutaryl-CoA reductase isozymes (HMGR1 and HMGR2) and farnesyl pyrophosphate synthase might be not so critical in pepper carotenoid biosynthesis but three genes encoding geranylgeranyl pyrophosphate synthase, phytoene synthase and phytoene desaturase were induced in a sequential manner and coordinately regulated during the ripening of pepper fruit.

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2007.11a
• /
• pp.243.2-243.2
• /
• 2007

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2007.11a
• /
• pp.211.1-211.1
• /
• 2007

• Proceedings of the KAIS Fall Conference
• /
• 2010.05b
• /
• pp.1173-1176
• /
• 2010

회전익 항공기의 연료탱크는 피탄으로 인해 연료 누유시 발생할 수 있는 화염으로부터 기체와 승무원의 생존성을 높이기 위하여 연료누설을 차단하는 자기밀폐 기능이 필수적으로 요구된다. 자기밀폐 기능은 내부에 적층된 자기밀폐 소재가 누설되는 연료와 화학반응을 일으켜 급속히 팽창됨으로써 피탄부를 막아, 연료누설을 차단하는 역할을 한다. 본 연구는 미군사규격(MIL-DTL-27422D) 기준으로 국내에서 제작 및 수행한 회전익 항공기의 연료탱크 자기밀폐 성능시험 평가 결과를 제시한다.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.6 no.3
• /
• pp.185-192
• /
• 2002

Prototyping for field inspection safety assessment expert system of bridge structures is presented in this paper. Knowledgebase with production rules is constructed using the semiautomatic method on the basis of bridge inspection manuals and working reports of the related agency. Backward inference method is taken with the aids of external shells as a inference engine of knowledge-based systems. Implementation of the developed prototype system on MS Windows98 will shows inspiring aspects useful to guide and standardize the field works. In the case to be reinforced with abundant knowledge bases, this will be expected to be educate the practicing engineers.

• Proceedings of the Korean Nuclear Society Conference
• /
• 2005.05a
• /
• pp.895-898
• /
• 2005

• 한국IT서비스학회:학술대회논문집
• /
• 2003.05a
• /
• pp.222-229
• /
• 2003

In the process of global transportation, many value chains which have different business process, system and technology level respectively are connected to each other. To obtain end-to-end visibility of transportation, these kind of discrepancy has to be solved appropriately. In this paper, the realization of global visibility is discussed in three point of view such as 'Data Sourcing', 'System integration' and 'System Operation'. First, the data sources of global visibility are described especially from the point of enterprise applications view, and then system integration is presented using various current e-commerce technologies for example XML, EDI and so on. Finally, flexible operation of visibility function is suggested which satisfies different goals of each value chain.

• Journal of Electrical Engineering and Technology
• /
• v.7 no.1
• /
• pp.103-108
• /
• 2012

The present study describes the considerations on the long-term reliability of the on-line partial discharge (PD) ceramic sensor for thermal power generators. Voltage acceleration aging tests were carried out under continuous and impulsive thermal aging at more than $100^{\circ}C$, considering the practical service environment. Experimental results show that the sensors have a life that could last for more than 100 years, excellent dielectric characteristics, and insulation strength. In addition, the ceramic on-line PD sensors were installed in a thermal power generator in Korea for demonstration. The results of the PD calibration and test voltage application prove that the on-line ceramic sensors have satisfactory performances for on-line PD measurement.