• 한국정보통신학회논문지
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• 제14권6호
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• pp.1423-1428
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• 2010

본 논문은 윈도우 운영체제에서 파일 및 디렉토리 관련 보안 기능을 설계한다. 윈도우 운영체제는 전 세계적으로 널리 사용되고 있다. 윈도우 운영체제를 사용하다보면 중요한 파일의 경우 보호를 할 필요성이 있다. 본 논문은 윈도우 운영체제에서 파일과 디렉토리에 대한 보호 기능을 제공하도록 설계한다. 본 논문에서 제공하는 기능은 윈도우 운영체제 내의 특정 파일에 대한 보안 기능을 설정할 수 있는 경우와 윈도우 내의 특정 디렉토리를 보안 설정하는 기능으로 되어 있다. 본 논문에서 설계한 내용이 정상 동작되는지 실험을 수행하였다. 실험 결과 정상적으로 동작됨을 확인할 수 있었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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• pp.246-248
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• 2001

In this paper, the fault analysis program that is convenient to analyse fault records of a digital relay and to set a digital relay is described. The key feature of this fault analysis program is as follows. - analysing fault records stored in a local PC and/or a digital relay - analysing events - setting a digital relay. This program is for a digital bus protection relay using a conventional variable percentage current differential relaying algorithm. So this program adds a function analysing the characteristic of each variable percentage current differential function and the connection state of the transmission lines at double-bus system.

• Corrosion Science and Technology
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• 제11권3호
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• pp.77-81
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• 2012

Cathodic protection(CP) is widely used as a means of protecting corrosion for not only marine structures like ship hulls and offshore drilling facilities, but also underground structures like buried pipelines and oil storage tanks. The principle of CP is that the anodic dissolution of metal can be protected by supplying electrons to the cathode metal. When unprotected structures are nearby to CP systems, interference problems between unprotected and protected structures may be happened. The stray current interference can accelerate the corrosion of nearby structures. So far many efforts have been made to reduce the interference in the electric railway systems adjacent to the underground metal structures like buried pipelines and gas/oil tanks. During recent few decades the protection technologies against stray current induced corrosion have been significantly improved and a number of techniques have been developed. However, there is very limited information an marine environments. Some complex harbor structures are protected by two cathodic protection systems, i.e. sacrificial anode cathodic protection(SACP) and impressed current cathodic protection(ICCP). In this case, when the protection current from sacrificial anodes returns to the cathode through electrolyte, it passes through nearby other low resistance metal structures. In many cases the stray current of ICCP systems influences the function of SACP. In this study, the risk of stray current from the SACP system to adjacent reinforced concrete structures has been verified through laboratory experiments. Concrete and steel pile structures modeled a part of bridge have been investigated in terms of CP potential and current between the two. The variation of stray current according to the magnitude of ICCP/SACP has been studied to mitigate it and to suggest the proper protection criteria.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.711-713
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• 2001

MCCB(Molded Case Circuit Breakers) is a multi-function safety device which, unlike other forms of protection, combines many protection features in a single unit. This paper is the analysis of magnetic repulsion forces with the breaking current 11.28kA, 22.5kA, 38.9kA and 45kA.

• 충청수학회지
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• 제5권1호
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• pp.87-97
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• 1992

Sequential procedure with ${\beta}$-protection for the mean vector ${\mu}(\theta)$ of a p(> 1)-variate multivariate distribution $P_{\theta}$, ${\theta}{\in}{\Theta}$, with covariance matrix ${\sum}(\theta)$ is considered when the only nuisance parameters is ${\sum}(\theta)$. We obtain a confidence set for ${\mu}(\theta)$ with coverage probability condition and ${\beta}$-protection at ${\mu}-{\delta}(\mu)$ for some imprecision function ${\delta}:\mathbb{R}^p{\rightarrow}\mathbb{R}^p$.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 가을 학술발표논문집 Vol.31 No.2 (1)
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• pp.334-336
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• 2004

국내 전자상거래 제품과의 호환성과 확장성을 위하여 국내 전자서명 표준인 KCDSA(Korean Certificate-based Digital Signature Algorithm) 메커니즘을 PKCS(Public Key Cryptographic Standard) #11 암호 API(Application Programming Interface)에 기능을 추가한다. PKCS #11에서 정의한 키 관리(Hey Management) 함수의 입력 파라미터에 암호화할 키를 바로 입력하면 변조된 키를 전달할 수 있으므로, 본 논문에서는 안전한 키보호(Key Protection) 함수를 새로 정의하여 암호화할 키 대신 사용자 PIN(Personal Identification Number: 패스워드) 입력하여 사용자의 KCDSA 개인키와 공개키를 보다 더 안전하게 보관하고자 한다.

• Safety and Health at Work
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• 제12권1호
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• pp.133-135
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• 2021

The COVID-19 pandemic has resulted in movement restrictions being instituted globally and the cessation of work at many workplaces. However, during this period, essential services such as healthcare, law enforcement, and critical production and supply chain operations have been required to continue to function. In Singapore, measures were put in place to protect the workers from infection at the workplace, as well as to preserve the operational capability of the essential service in a COVID-19 pandemic environment. This paper critically analyses the measures that were implemented and discusses the extension to broader general industry.

• 정보보호학회논문지
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• 제23권1호
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• pp.11-18
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• 2013

실행코드의 변조와 역분석 방지를 위해 단순히 선행블록에서 암, 복호화 키를 얻던 기존의 기법과 달리, 암호학적 MAC함수를 이용한 암호화기법과 코드 블록 간 중요도에 따라 상관관계를 설정하고 상관관계에 따라 암, 복호화 키를 생성하는 새로운 변조 방지 기법을 제안한다. 본 논문에서는 기존의 해쉬함수 대신 암호학적 MAC함수를 사용하고 MAC함수의 키를 동적으로 생성하는 방법을 소개한다. 또 단순히 선행블록의 해쉬 값에서 키를 얻는 것이 아니라 실행 코드 블록을 중요도에 따라 중요도 높음, 중간, 낮음으로 분류하고 중요도 높음 블록은 암호화하고 중요도 중간 블록은 중요도 높음 블록의 키를 생성시키는 블록으로 분류한다. 또 중요도 낮음 블록은 아무 처리도 하지 않음으로 소프트웨어 효율성을 고려한다. 기존 해쉬함수 대신 동적으로 생성되는 링크키를 이용한 MAC함수와 블록상관관계를 함께 사용함으로써 공격자의 분석을 어렵게 한다.

• 가정과삶의질연구
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• 제10권2호
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• pp.51-59
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• 1992

Previous studies indicated that unmarried persons are subject to higher mortality than the married, and that the differentials are more marked for male than for females. There are two major approaches to explaining the marital status differentials in mortality ; selection function and protection function of marriage. Following protection fucntion, this study develops the new "instrumental / expressive sex-role" hypothesis in order to explain why marriage protects males more against death. The hypothesis expects that male's instrumental role and female's expressive role have direct effect as well as indirect effect through social integration on sex differential mortality by marital status. for the hypothesis testing, Korea and US vital statistics and census data are used to compute age-specific , age-adjusted mortality rates and their ratios for persons in different marital status. Major findings are as follows. 1)For both Korea and US being married is more advantageous to males than females, ad being widowed, divorced, and separated is more disadvantageous to males, while being never-married is more disadvantageous to females, 2) For Korea, the never married men and women have the highest mortality rates, 3) For US the never married women have the highest mortality rate, while the divorced, separated, and widowed men have the highest mortality rate. Fro both Korea and US data, selection function is rejected, but instrumental/expressive sex-role hypothesis succeeds in accounting for the sex and marital status differential in mortality.

• Nuclear Engineering and Technology
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• 제45권4호
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• pp.489-504
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• 2013

Software safety for nuclear reactor protection systems (RPSs) is the most important requirement for the obtainment of permission for operation and export from government authorities, which is why it should be managed with well-experienced software development processes. The RPS software is typically modeled with function block diagrams (FBDs) in the design phase, and then mechanically translated into C programs in the implementation phase, which is finally compiled into executable machine codes and loaded on RPS hardware - PLC (Programmable Logic Controller). Whereas C Compilers are fully-verified COTS (Commercial Off-The-Shelf) software, translators from FBDs to C programs are provided by PLC vendors. Long-term experience, experiments and simulations have validated their correctness and function safety. This paper proposes a behavior-preserving translation from FBD design to C implementation for RPS software. It includes two sets of translation algorithms and rules as well as a prototype translator. We used an example of RPS software in a Korean nuclear power plant to demonstrate the correctness and effectiveness of the proposed translation.