• 정보보호학회논문지
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• 제20권5호
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• pp.49-57
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• 2010

오류 분석 공격은 암호용 디바이스가 동작하는 동안 오류를 주입한 후 그 결과를 분석함으로써 사용된 비밀키를 추출하는 물리적 공격 방법이다. 이러한 오류 분석 공격에 의해 표준 서명 알고리듬인 DSA(Digital Signature Algorithm)도 취약한 특성이 있음이 밝혀졌고 이를 방어하기 위한 대응책들도 제시된 바 있다. 본 논문에서는 오류 분석 공격을 방어할 수 있는 새로운 DSA 서명 기법을 제안한다. 제안 기법은 서명 연산시 한 번의 역수 연산만 추가 되므로 타 대응 방식에 비해 효율적으로 구현할 수 있다.

• Journal of Advanced Marine Engineering and Technology
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• 제15권2호
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• pp.44-52
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• 1991

The crankshaft system of engine is a complex vibratory object and its vibration modes are consisted of torsional, axial and their coupled vibration. Among them, the torsional vibration causes engine noise as well as serious fatigue faillures of crankshaft. If the troules of noises and crankshaft strength are forecasted by torsional vibration calculation in the design atage of crankshaft, the torsional damper is adopted as the final countermeasure. In this paper, some computer program to calculate crankshaft torsional vibration of engine are developed and with developed programs, an efficient rubber-viscous damper for automobile and with developed programs, an efficient rubber-viscous damper for automobile engine is designed and manufactured, and then it is fitted on the actual automobile engine to confirm its calculated efficiency. By comparing the measured result (with damper and without damper) with the calculated one, the reliability of developed computer programs and the performances of manufactured damper are confirmed.

• 한국군사과학기술학회지
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• 제12권3호
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• pp.317-324
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• 2009

Tactical Information Communication Network(TICN) uses both a wireless and wired network. To support mobility in battlefield environments, the application of Ad-hoc networking technology to its wireless communication has been examined. However, Ad-hoc network is faced to many security threats due to its intrinsic characteristics. Therefore, to apply the Ad-hoc networking technology to battlefield environments and TICN, an intensive study on security countermeasure must go side by side with the development of enabling technology. In this paper, we suggest an efficient key management scheme for TICN of which the Ad-hoc networking technology is applied.

• ETRI Journal
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• 제34권3호
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• pp.482-484
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• 2012

With the rapid progress of wireless mobile communications, the authenticated key agreement (AKA) protocol has attracted an increasing amount of attention. However, due to the limitations of bandwidth and storage of the mobile devices, most of the existing AKA protocols are not suitable for wireless mobile communications. Recently, Lo and others presented an efficient AKA protocol based on elliptic curve cryptography and included their protocol in 3GPP2 specifications. However, in this letter, we point out that Lo and others' protocol is vulnerable to an offline password guessing attack. To resist the attack, we also propose an efficient countermeasure.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.581-584
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• 2008

본 연구에서는 형상과 규모에 따른 낙석의 특성별로 그 운동과 영향 요인을 분석하였다. 선정된 대상 사면에 대해 낙석 시뮬레이션 프로그램을 수행하여 낙석 특성별 운동에너지 분포화 낙하속도, 도약높이 등에 대한 분석과 연구를 수행하였다. 또한, 연구대상 절토사면의 대책 방안인 낙석방지울타리의 효율적인 설치를 위해 낙석의 운동에너지와 도약높이 등을 활용하는 방안을 검토하였다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2004년도 제5회 정기학술발표대회 논문집
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• pp.556-560
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• 2004

최근 건설 계획이 증가함에 따라 건물 신축과 건물 폐기에 의한 건설 폐기물이 빠르게 증가하고 있다. 이로 인한 문제점으로 신축에 의해 발생되는 건설 폐기물의 처리를 매립에 대부분 의존하고 있기 때문에 환경오염 문제가 발생과 환경 단체의 반대에 천연골재 채취를 제한하고 있어서 건설업계에서 골재 부족문제가 대두되었다. 따라서 연구 단체에서는 이 두 가지 문제에 대한 해결방안으로 순환골재가 제시되고 있다 하지만 건설 현장에서는 거의 사용되지 않고 있다 이에 본 연구에서는 순환골재가 사용되지 않는 이유를 경제적인 면, 제도적인 면, 기술적인 면으로 분석하고 각 측면에서 순환골재의 활용화 방안에 대해 제시하고자 한다. 이를 통해 골재부족 문제해결과 폐기물의 매립에 의한 환경오염의 경감을 기대할 수 있을 것이다.

• Journal of Advanced Marine Engineering and Technology
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• 제16권5호
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• pp.85-96
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• 1992

Engine enclosures are widely adopted to reduce the noise emission in various fields of application. The radiated noise, which is due to the vibration of enclosure's outer surface, is composed of two kinds of sound power with different path of propagation. One is the 'structure-borne sound power' which stems from the engine's vibratory force applied to the structure of enclosure through the mounting parts of engine etc., while the other is the 'air-borne sound power' which is originated by the sound power radiated from the engine surface to the inner space of enclosure that should excite the vibration of enclosure from inside. In order to get a most efficient engine enclosure is required a profound consideration upon the above structure-borne and air-borne noise, since the guiding principle of countermeasure for each noise is quite different. The controlling of input vibration and its isolation are major subject for the structure-borne sound power and the specifications of absorbing member and damping panels are the major interests for the air-borne sound power. Hence it seems very efficient to separate the total sound power into two categories with a great accuracy when one think of further reduction of engine noise from the exciting enclosure, however, its separating methods have not been made clear for many years. Then author proposes a new practical separation method of two propagation path's contribution to the total radiation sound power for the enclosure under the engine operating condition.

• 한국농공학회논문집
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• 제55권6호
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• pp.77-85
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• 2013

The efficient operation and management strategies of reservoirs in irrigation periods of drought events are an essential element for drought planning and countermeasure. Korea Rural Community Corporation has developed the real-time water level observation system of agricultural reservoirs to efficiently operate reservoirs, however, it is not possible to predict drought conditions, and only provides information of current situation. Hence, it is necessary to evaluate accurate irrigation vulnerability and efficiently reservoir operation rules using current water level. In this paper, the improvement methods of reservoir operation planning were developed with water supply vulnerability characteristic curves comparing to automatic water gauge at agricultural reservoirs. The 11 reservoirs were simulated applying the reservoir operation rules which was determined by irrigation vulnerability characteristic curves criteria and real time water level, and evaluated water supply situation in 2012 year. The analysis of results can be identified probabilistic possibility of water supply failures compared with the existing reservoir operation criteria. These results of efficient reservoir operation rules can be achieved enable irrigation planners to optimally manage available water resources for decision making, and contributed to maintain the water supply according to demand strategy for agricultural reservoirs management.

• 한국컴퓨터정보학회논문지
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• 제10권4호
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• pp.375-384
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• 2005

정보통신기술이 발달함에 따라 보안 사고가 증가로 조직의 효율적인 보안 관리를 위한 보안수준 측정에 대한 방법과 도구개발의 필요성이 요구되고 있다. 그러나 외국의 연구는 대부분 수준 측정을 위한 항목구성이 우리 조직의 실정에 맞지 않고 또한 도구 역시 사용의 편이성이나 경제성을 제공하지 못하고 있으며, 국내의 연구 또한 보안수준 측정 시 조직의 특성을 적절히 감안하지 못하고 있다. 따라서 본 논문에서는 다중 가중치를 조직의 특성에 따라 가변적으로 적용하고 수준 측정자의 주관성을 감소시키기 위하여 퍼지기법과 비용 한계의 범위 안에서 보안 대책의 수립을 위해 유전 알고리즘을 적용한 효율적인 보안 수준측정 도구를 제안하고자 한다.

• ETRI Journal
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• 제33권2호
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• pp.267-274
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• 2011

This paper proposes an efficient masking method for the block cipher SEED that is standardized in Korea. The nonlinear parts of SEED consist of two S-boxes and modular additions. However, the masked version of these nonlinear parts requires excessive RAM usage and a large number of operations. Protecting SEED by the general masking method requires 512 bytes of RAM corresponding to masked S-boxes and a large number of operations corresponding to the masked addition. This paper proposes a new-style masked S-box which can reduce the amount of operations of the masking addition process as well as the RAM usage. The proposed masked SEED, equipped with the new-style masked S-box, reduces the RAM requirements to 288 bytes, and it also reduces the processing time by 38% compared with the masked SEED using the general masked S-box. The proposed method also applies to other block ciphers with the same nonlinear operations.