• 전기의세계
• /
• v.24 no.2
• /
• pp.71-77
• /
• 1975

This paper describes the results of a study for the stability of power system when the Kori Nuclear #1 P/P is operated with existing system. First, a transient disturbance, which effects the stability of entire power system, was analysed and to cope with the problem a load shedding method was studied to recover the fluctuation of the power system. Second, transient stability problem was studied when three phase fault occurs in 345 Extra High Voltage power System, and from this result, it was found to be highly effective that high speed protecting device should be provided and operated to recover the fault.

• Journal of the Korean Society of Industry Convergence
• /
• v.9 no.1
• /
• pp.87-91
• /
• 2006

This research exposes the process of carbonization of solid waste from the city and the method of activated, as well as the process of meso-porous under several test conditions. In addition, it is expected that the active carbon obtained through this process can be used as filter for air and sewage treatment, and can absorb dioxin(as almost 60-80% of meso-porous and porous properties area) unlike the existing active carbon.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2004.10a
• /
• pp.998-1002
• /
• 2004

As the public use part of the railway and the road, the railway crossing is important to work properly by two transportation means. Also, It is important to provide the good face of friction on the railway crossing in aspect of protecting the railway crossing accident. Lately, Many kinds of the material are used for railway crossing panel. As they have a various fault, it was studied to analyze the structural action of the new material, rubber panel. This paper analyzed stress and displacement by truck passing weight using the Finite Element Modeling.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1998.10c
• /
• pp.207-210
• /
• 1998

Recently it has become general to use the inhibitor with a view to protecting corrosion of rebars in concrete. So, it needs to study effect of protection and reasonable dosage of inhibitor to reduce corrosion of rebar in concrete containing chlorides. In this study, we estimate the corrosion rate of rebar in mortar by Tafel extrapolation method, one of electrochemical techniques, and the reasonable dosage of inhibitor for different chlorides environments.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2001.11a
• /
• pp.657-661
• /
• 2001

버퍼 오버플로우는 최근에 나온 개념은 아니다. 1996년 버퍼 오버프로우가 Phrack 문서를 통해 세상에 알려지자 유닉스 계열의 운영체제들은 보안 문제로 많은 어려움을 겪게 되었다. 이 공격은 내부에서 쉘을 실행해 원격지에서 루트권한을 획득할 수 있기 때문에 보안상 위협 중에 가장 심각한 부류에 속한다. 아직까지도 공격 방법 중에서는 가장 많은 부분을 차지하고 있다. qs 논문에서는 버퍼 오버플로우의 원리 및 관련 연구에 관해서 살펴보고, 기존 대응책인 stackguard를 기본으로 하여 좀 더 개선시킨 대응책을 제안하고자 한다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
• /
• 2001.11a
• /
• pp.432-436
• /
• 2001

본 논문에서는 XTR을 이용해 Schnorr 개인식별 프로토콜을 구성하여 블랙메일링 공격이 있을 경우에 은행에게 블랙메일링 공격에 대한 정보를 개인식별 과정에서 알려주는 방법을 제안한다. 본 논문에서 제안한 XTR 버전의 Schnorr 개인식별 프로토콜을 사용하면 기존의 방법들이 블랙메일링 공격을 막기 위해 필요로 하는 가정들을 사용하지 않고도 효과적으로 블랙메일링 공격을 막을 수 있는 새로운 방법이 된다.

• Current Optics and Photonics
• /
• v.2 no.3
• /
• pp.221-225
• /
• 2018

We suggested the use of miniature hollow glass tubes having high ultraviolet (UV) transmission characteristics for the protection of optical-fiber-type UV sensors. We have recently proposed a highly sensitive optical sensor in the UV spectral range, using a fiber Bragg grating (FBG) coated with an azobenzene polymer as the photoresponsive material. In this study, we used UV-transparent miniature glass tubes to protect the etched FBG with the azobenzene polymer coating. This technique will be very useful for protecting various fiber-based UV sensors.

• Proceedings of the PSK Conference
• /
• 2003.10b
• /
• pp.179.2-179.2
• /
• 2003

We have developed the novel one-pot synthetic method for regioselective and stereoselective N-protected amines through the reaction of various ethers with chlorosulfonyl isocyanate (CSI). Also, we found a novel technique to compare directly the stability of carbocations in the solution phase and established the stability order of the various carbocations. And we reported the cleavage of benzyl and p-methoxybenzyl protecting groups of alcohols and phenols in the presence of other functional groups using CSI. (omitted)

• Journal of Korean Society for Quality Management
• /
• v.31 no.4
• /
• pp.226-238
• /
• 2003

Recently, The problems with which our country's company is confronted for business of manufacturing goods. This study set the hypothesis to develop the method that was analysis and application of A reliability evaluation method of environmental material for circuit components in Computer, Color TV, Monitor, Microwave oven, Electric Refrigerator, Automobile parts, other goods. Especially, this study emphasis on regulate export of the EU and North America that it's a environmental material's hazards problem. In this process, this study set the pattern of practical application. Therefore, this study emphasis on the application of A reliability evaluation method of environmental material and the use of other parameters by environmental reliability test data. The result of this study is as follows. 1) There is relationship between regulate material and technical protecting system. 2) Characteristics of hazard materials is operating a healthcare damage factor as well as regulate environmental factors.

• Journal of the Semiconductor & Display Technology
• /
• v.15 no.4
• /
• pp.92-96
• /
• 2016

Although deregistration attack is caused by simple spoofing the REGISTER message of a legitimate SIP UA, its impact is serious. The root cause of this attack is based on the fact that RFC 3261 allows the UA to remove the binding from the Location Server. In this paper, we propose a simple protection method to allow Registrar or Location Server just to ignore deregistration messages. We also show that this method works well by analyzing the process of registration and deregistration. Without any additional overhead such as an encryption or authentication, this method is able to establish a secure SIP environment efficiently protecting against the deregistration attack.