• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.12
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• pp.2581-2588
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• 2012

Survivability of combat system is changed by various facts in dynamic battle field. Existing survivability analysis programs for a combat system analyze statically survivability for combat system in spite of dynamic battle environment. To overcome this limitation, we propose an agent-based modeling and simulation method for dynamic survivability analysis of the combat system. To do this, we have adopted DEVS formalism, SES/MB framework and agent technology for modeling components of the combat system and crews. The proposed method has advantages of being able to analyze not only a static survivability of the combat system but also a dynamic survivability of combat system by applying responses of crews in battle field.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.5
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• pp.1269-1276
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• 2015

The mission capability of tank depends on its survivability. The survivability is ability for protection and tolerance by damage from threats. To improve the survivability of tank, we need an effectiveness analysis for loss of components, and accomplish performance enhancement using the result of analysis. In this paper, we develop a survivability analysis system for tank based on the importance. The importance numerically represents weight of each component which consisting of whole tank, also the importance is basic method of quantitative survivability analysis. To do this, we assign weight values to each component of tank, compose a weight tree, apply the importance calculation equation, and analyze the survivability of tank. Also we develop the system that consists of component structuralization and weight value setting program and survivability analysis and visualization program, and evaluate the system using implemented 3D CAD models of components of tank. The developed system apply to arrangement components.

• Journal of the Korea Society for Simulation
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• v.30 no.1
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• pp.1-9
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• 2021

In actual battlefield environment, the naval ships which have specific missions have to respond to the attack of hostile forces. Especially, in modern warfare, the importance of the survivability of naval ships are increasing due to the high lethality of armaments. Naval ship survivability is generally considered to encompass three constituents, susceptibility, vulnerability and recoverability. Recently, among these three constituents, many researches on vulnerability have been conducted. However, for the vulnerability of naval ships, most of researches are aimed towards the detailed design stages where implementing changes is heavily constrained or even impractical. In this paper, vulnerability assessment model for naval ships on a theater engagement is developed by using M&S technique. By using this model, the characteristics of platform and armaments are reflected on the damage of naval ship. The basic logic of damage assessment is also considered in detail. The damage status of the naval ship is quantified by defining a representative state index of onboard equipment for each system.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.329-331
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• 2003

프로그램에 취약성이 없다는 것을 증명하는 것은 거의 불가능하다. 또한 현재 보안을 위해서는 인증과 접근제어, 암호화를 이용하지만 이러한 단순한 보안 기술은 버퍼오버 플로우와 같은 프로그램의 취약성을 이용한 공격에 대해 적절한 방어 대응을 할 수 없다. 그러므로 현재 위협적인 공격으로부터 중요한 기능을 지속적으로 제공하여 시스템 방어능력의 향상을 위한 생존성에 대한 연구가 필요하다. 동적협동은 이러한 생존성 연구의 일부분으로 생존성 기능을 가진 각 프로그램들이 동적환경에서 협동할 수 있는 환경을 제공해주는 기술에 대한 연구이다. 본 논문에서는 동적협동에 대한 분석을 통해 동적협동의 아키텍처와 각 구성요소의 기능에 대해 제시한다.

• Proceedings of the Korea Society for Simulation Conference
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• 2003.11a
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• pp.107-112
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• 2003

2003년 1월 25일의 인터넷 침해사고는 정보통신망의 중요성을 실감하게 해준 사건이다. 이 사건의 원인을 여러 가지로 말할 수 있지만, 가장 근본적인 원인은 소프트웨어의 취약점에 대한 관리가 부재한 것이었다. 소프트웨어가 특정 취약점을 갖게되는 데에는 다양한 원인이 존재하며 이에 대한 연구는 폭넓게 진행되어 왔다. 본 논문은 이러한 연구들을 기반으로 취약성을 모델링하는 방법에 대해서 다루고자 한다. 특히, 단위 취약점 개념을 사용한 취약성의 시스템적인 분석 방법을 설명하고, 이러한 개념이 생존성 평가에 어떻게 활용될 수 있는지를 다루고자 한다. 본 논문의 연구 결과는 기존의 취약성 분석 기법을 좀더 정형화 해주는 역할을 할뿐만 아니라, 정보보호 영역에 시뮬레이션 기술을 어떻게 활용할 수 있는지에 대한 하나의 방법으로 활용될 수 있다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.45 no.12
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• pp.1084-1093
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• 2017

As the survivability of an aircraft in the battlefield becomes a critical issue, there is a growing need to improve the survivability of the aircraft. In this study, the survivability of an UCAV associated with plume IR signature was investigated. In order to analyze the survivability of the aircraft, the lock-on range and the lethal envelope, defined as the IR detection distance of the aircraft and the range of shooting down by the missile, respectively, were first introduced. Further, a method to calculate the lethal envelope for the scenario of surface-to-air missiles including the vertical plane was developed. The study confirmed that the red zone of an UCAV shows a substantial difference in the zone size as well as the characteristics in the upward and downward directions.

• The KIPS Transactions:PartC
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• v.12C no.5 s.101
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• pp.633-642
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• 2005

Ubiquitous computing system is about networked processors, which is constructed with one or more computers interconnected by the networks. However, traditional security solution lacks a Proactive maintenance technique because of its focusing on developing the qualitative detection and countermeasure after attack. Thus, in this paper, we propose a quantitative assessment modeling technique, by which the general infrastructure can be improved and the attacks on a specific infrastructure be detected and protected. First of all, we develop the definition of survivality and modeling technique for quantitative assessment modeling with the static information on the system random information, and attack-type modeling. in addition, the survivality analysis on TCP-SYN attack and code-Red worm attack is performed for validating the proposed technique.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.39 no.3
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• pp.132-139
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• 2002

The implementation of passive optical network in the access network will result in design of the network that have characteristics of broadband, long distance transmission, transparency. Particularly, optical technologies of WDM and WGR have made a new access network of WDM-PON. This paper proposes the algorithm that determines structural elements of a survivable optical access network, and simulates the cost of various scheme of proposed network architectures. Our results show that multistage star is the most cost effective scheme than the other architectures and show that network architecture designed by proposed algorithm provides survivability with single link and 1st node failure.

• Journal of Aerospace System Engineering
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• v.12 no.4
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• pp.106-111
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• 2018

Hydrodynamic ram phenomenon could be generated by external threats such as impact and blast in the aircraft. High strain rate deformation caused by the hydrodynamic ram phenomenon is one of the main factors to influence structural survivability. Mechanical properties of composite structure change rapidly under conditions of high strain rate. Therefore, it is necessary to experimentally investigate the influence of strain rates for aircraft structural survivability. In this paper, tensile tests of composite material were conducted for low and high strain rates to investigate the influence of the various strain rates. Tensile modulus increases more compared to tensile strength at high strain rate under hydrodynamic ram condition. Regression analysis was conducted to predict tensile modulus at various strain rates because it is one of the main damaging factors for composite structures under high strain rate conditions. Also, the mechanical properties of composite materials were acquired and analyzed under high strain rate conditions. It is hypothesized that the results from this study would be used for designing aircraft composite structures and evaluation considering structural survivability.

• Journal of Embryo Transfer
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• v.14 no.1
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• pp.69-77
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• 1999

본 연구는 돼지 정액의 동결과정동안 flow cytometric 분석에 의한 정액내 생존정자의 비율을 조사하여 주관적으로 평가되는 활력 및 정상첨체율(normal apical ridge ; NAR)과 비교하여 정자의 손상과 생존성에 대한 적절한 평가법을 찾기 위하여 실시하였다. 동결과정 중 정액채취, 냉각, 예비동결 및 동결융해 후에 flow cytometric 분석에 의한 정자 생존율은 각각 93.0$\pm$3.6, 85.1$\pm$3.9, 28.9$\pm$6.8 및 26.1$\pm$5.9%이었다. 동결처리동안에 생존율은 예비동결 및 동결융해 후 가장 많은 정자사멸로 동결상태 이전의 생존율보다 유의적으로 낮게 나타났다. (p<0.05). 평가기법으로 정액 채취시 활력, NAR율 및 생존율을 조사한 결과 각각 91.0$\pm$4.2, 96.8$\pm$2.5 및 92.2$\pm$3.2%로 NAR율이 생존성 및 활력보다 높게 평가되었으며, 생존율이 활력보다 다소 높게 평가되었다. 그러나 동결융해 후에는 각각 44.0$\pm$8.9, 49.0$\pm$7.9 및 35.6$\pm$9.7%로 활력이 생존율보다 다소 높게 평가되었다. 전체적으로 NAR율은 활력은 생존율보다 높게 평가되었으며, SYBR-14 / PI(propidium iodide) 이중형광염색법에 의한 flow cytometric 평가법으로 생존율은 동결되지 않은 정액에서의 활력 및 NAR 평가보다 다소 민감하게 나타났다. 이러한 결과로 미루어보아 SYBR-14 / PI 형광염색에 의한 flow cytometry의 생존성 평가는 동결되지 않은 정액의 평가방법으로는 적절하지만 동결된 정액의 생존성 평가는 부적절한 것으로 사료되었다.