• The Transactions of the Korea Information Processing Society
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• v.6 no.11S
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• pp.3356-3366
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• 1999

Electric commerce system based on distributed mobile on object such as mobile agents need both precise identification and secure authentication scheme on remotemobile entities. In this paper, existing discrete logarithm based Schnorr like entity authentication schemes are improved by the analysis of performance and security on the bi-directional interactive proofs. And ElGamal like schemes are also proposed. Then, there are enhanced with oblivious transfer based mono-directional authentication schemes based on trusted third party for applying to the mobile agent based computing systems. Therefore, proposed schemes provide compatible performance and safety on mobile entity authentication process.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10b
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• pp.1237-1240
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• 2001

본 논문에서는 이동 통신 환경에서 사용자가 다양한 서비스 제공자와의 효율적인 인증과 키 교환 프로토콜을 수행할 수 있는 새로운 프로토콜을 제시한다. 사용자의 이동성을 지원하기 위하여 이동 사용자가 방문하고 있는 도메인에서 사용할 수 있는 임시적인 인증서 발급 과정을 제안하였다. 제안된 임시 이동 사용자 인증서는 사용자가 방문하고 있는 도메인에 위치한 TTP의 비밀키로 전자서명이 이루어져서 사용자에게 발급이 이루어진다. 이동 사용자는 자신에게 발급된 임시 이동 사용자 인증서를 이용하여 이동 통신에서의 AIP(Authenticationandlnitializationofrayment) 프로토콜을 효율적으로 수행할 수 있다.

• 제어로봇시스템학회:학술대회논문집
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• 1996.10b
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• pp.1241-1244
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• 1996

This paper present a performance evaluation method for Timed Place Petri Nets modeled by Live-and-Bounded Circuits (LB-circuits) through a bottom-up approach. The method can handle the case for the nets having common resources(CR). The target system is divided into the sub-systems by disconnecting the common Transition-Transition-Path(TTP) or Place-Place-Path (PPP) between sub-systems. The common PPP pattern is classified into Parallel Common Resource (PCR) and Sequential Common Resource (SCR) in detail for handling common resources. We evaluate the performance of each divided sub-system, and calculate the sub-systems affect on the performance of the whole system. The facts are generalized as a theorem. The developed theorem are applied into the performance evaluation of an automated assembly system shown in an example. All the results are verified by simulation.

• Proceedings of the KIEE Conference
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• 2004.07d
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• pp.2625-2627
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• 2004

Recently many technology of the T.T.P.(Train Tilting Processor) has been introduced for an efficient real-time operating system. but the problems of testing increasing complex digital integrated system continue to challenge the design and test community. Design main processor part that can be used on railroad synthesis control part by ARM CORE chip.

• Proceedings of the KSME Conference
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• 2000.04a
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• pp.194-199
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• 2000

The creep rate is affected by the temperature and in fact. if the temperature above $T_M/2(T_M:melting\;point)$. The aim of the present investigation is to study the relationship of static creep and cyclic creep behavior of pure copper and the formulation of these phenomena with the special attention to the instantaneous strain. strain rate from time and number of cycles have the same inclination Steady state creep rate depend upon maximum stress and can be expressed as linear function according to Power law creep equations Creep rupture time has relation with creep rate. and it make a group represented as the same direct line regardless of max stress, stress ratio and the temperature. Initial strain effect on continuous creep deformation. and have guantitative relationship between elastic and Plastic strain. LMP have similar tendency than OSDP and MHP according to temperature

• Proceedings of the Korean Society of Toxicology Conference
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• 2001.10a
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• pp.9-9
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• 2001

Several micronutrients (vitamins and minerals) are required as co-factors in DNA synthesis, DNA repair, DNA methylation and apoptosis. Some notable examples include (a) folic acid and vitamin B12 required for maintenance methylation of DNA and the synthesis of dTTP from dUTP, thus prevent the misincorporation of uracil into DNA, a highly mutagenic and chromosome-breaking event, (b) niacin, is essential in the form of the coenzymes NAD and NADP which act as a substrate for polyADPribose polymerase (PARP), an enzyme thought to facilitate efficient DNA repair and telomere length regulation and (c) zinc, apart from its antioxidant role as a co-factor in Cu/Zn SOD, it is required in its stabilizing role of the DNA-binding domain of p53 (residues 102-292) and thus is essential for apoptotic response to DNA damage. (omitted)

• Proceedings of the Korean Society of Applied Pharmacology
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• 1995.04a
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• pp.76-76
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• 1995

Virus-encoded HIV-1 reverse transcriptase (RTase) is one of the major targets for the development of drugs for HIV-1 since it is an essential enzyme-for the replication cycle of HIV-1. We cloned the entire reverse trancriptase gene into an inducible expression vector with tac promotor= RTase was stably overexpressed and induced by IPTG and the highly-expressed RTase was purified partially by use of DEAE cellulose and Mono Q column. The partially purified enzyme (663kDa, 51kDa) as exhibited by SDS-PAGE showed the high specific activity (16,570U/mg) when the assay for the RTase activity was carried out using $^3$H-dTTP and poly(rA): oligo(dT)12-18 as the substrate.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.2117-2119
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• 2007

최근의 이상기후에 따른 악영향으로 항만구조물의 설계시 중요한 요소인 심해설계파가 증고되었다. 최근, 증고된 설계파에 대해 마루높이의 절감 및 단면축소에 따른 경제적 효과를 극대화시키기 위하여, 사석경사제형 제체 상부에 이중곡면 반파공을 적용한 각종 구조물형식이 도입되고 있는 추세이다. 본 연구에서는 수리모형실험을 통해 월파와 안정성 검토를 수행하여 방파제의 최적 단면을 선정하였다. 본연구의 수리모형실험에 적용된 단면형식은 총 4가지로 각각에 대해 월파량과 반사율을 측정하여 비교 검토하였다. 그 결과 TTP로 피복된 제체 상부에 이중곡면 반파공을 설치한 단면이 가장 우수한 단면으로 선정되었다. 또한, 이중곡면 반파호안의 계획과 설계시 체계적인 검토와 합리적인 단면계획을 수립하여 이를 통해 마루높이 절감에 따른 경제적 효과의 극대화를 기대할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1027-1030
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• 2002

본 논문에서는 제 3세대 이동 통신 시스템에서 안전한 전자상거래의 구현을 위한 인증 및 지불 메커니즘을 제안한다. 제 3세대 이동 통신 환경에서는 GSM이나 DECT와 같은 제 2세대 이동 통신 시스템에서 사용되지 못했던 공개키 기반 구조를 도입하여 각 이동 단말기 사이에 공개키 암호 시스템을 이용한 통신이 가능하게 되었다. 이동 사용자는 TTP(Trusted Third Party)로부터 획득한 공개키 인증서를 사용하여 외부 도메인에서도 종단간의 통신을 할 수 있으며 디지털 콘텐츠를 제공하는 사이트에 접속하여 안전한 서비스를 제공받을 수 있다. 본 논문은 이동 통신 환경에 적합한 소액지불 기법을 기반으로 하여 이동 사용자와 VASP간의 상호 인증 및 지불에 관한 기법을 제안한다.

• BMB Reports
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• v.37 no.4
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• pp.503-506
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• 2004

Glucose-1-phosphate uridylyltransferase from E. coli K12 was used to convert uridine-5'-triphosphate and glucose-1-phosphate to UDP-D-glucose. The conversion was efficient and completed within 5 minutes under the employed conditions. In addition, thymidine-5'-monophosphate kinase and acetate kinase were proven to be non-specific, converting udridine-5'-monophosphate to uridine-5'-triphosphate with 55% conversion after 6 h, which was much slower than the production of TTP under the same conditions (complete conversion within one hour). Since these two reactions could proceed under the same conditions, a one-pot synthesis of UDP-D-glucose with ATP regeneration was designed from easily available starting materials, and conversion up to 40% by HPLC peak integration was achieved given a reaction time of 4 h.