• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.31 no.6
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• pp.102-109
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• 2003

The number of engines for fighters has been decided by thrust required and available engines at the time since the beginning of the jet age. However, many factors such as combat effectiveness, survivability, performance, and cost were considered as engine technology has been progressed. From the vietnam war and desert storm, a twin engine fighter was shown slight superiority to a single engine one in an vulnerability，but single engine fighters were a little predominant in susceptibility This paper includes the trade-off study results on the number of engines for the supersonic light attack aircraft with single and twin engines. Twin engine configuration is 8%, 26%, and 13% higher than single engine one in MTOGW, Flyaway Cost, and LCC respectively. Little difference has been found in RM&S, Maneuver and field performance. According to the factors above, single engine fighter is profitable for low class and twin engine one for medium and higher class.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.12
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• pp.8314-8324
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• 2015

It has been recognized that in keeping the national defense capability on a leading edge, not only the continued production of weapon systems but also the associated maintenance and upgrades are becoming the subjects of great importance. Based on systems engineering process, the domestic acquisition programs for weapons systems led by DAPA have made some advancement where both new systems development and systems upgrade have attracted attention. On the other hand, as a useful type of domestic acquisition the foreign purchase program has been conceived as a process of simply buying needed weapons from abroad. Therefore, if some degree of development is necessary in system upgrades by foreign purchase, many problems turned out to exist. To study a remedy is the objective of this paper. The issues are analyzed first and then a relevant process is proposed based on a systems engineering method. Also included in the improved process is on how to generate a requirement document and the corresponding template to meet the goals of the upgrades by development. By applying the proposed process and template in the foreign purchase upgrade programs, derivation of more appropriate requirements can be expected, thereby offering effective management of programs and target goals.

• The Transactions of the Korea Information Processing Society
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• v.2 no.2
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• pp.237-246
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• 1995

As the needs for accessing distributed informations and computing resources are increasing the need for network interconnection is growing. There are many of the network management packages including performance management tools; but most of them are not appropriate to be used in heterogeneous interconnected networks. To monitor and to control efficiently the performance of heterogeneous network, first, we have to define all performance parameters in general meaning. We need models and criteria for supporting performance analysis activities of the management system. In this study, we have designed a centralized performance management system based on the OSI management, which can be used in heterogeneous networks.

• Journal of the Korea Society for Simulation
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• v.28 no.4
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• pp.33-43
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• 2019

Link-16 is a data link that provides joint interoperability to the US Navy, Air Force and NATO. Currently, the military relies entirely on foreign SW and tools for test environment, tactical simulation training and interoperability verification test for Link-16 operation. Therefore, it is necessary to develop Link-16 based operation environment test tool. In this paper, Link-16 network operational performance analysis simulator was developed by analyzing the function of Link-16 foreign tools. It also implements the SIMPLE standard interface for interworking with foreign SW and tools. The functional model for Link-16 network operation performance analysis consists of pre-analysis, real-time operational analysis, and post-analysis functional model. Each functional model test was performed through SIMPLE interworking with foreign SW and tools. Link-16 network operation performance analysis If we replace foreign SW through simulator, we can perform tactical training, network design verification and operation (scenario) verification for our military.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10d
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• pp.676-678
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• 2002

질의 응답 시스템(Question Answering: QA)에서 정답 유형 부류(Answer Type Taxonomy: ATT)란 사용자 질문 분석을 위한 미 부류 체계를 의미하는 것으로, ATT의 크기가 클수록 시스템의 성능은 높아진다. ATT를 확장하기 위해서는, 개체(Named Entity)에 의미 범주를 결정하는 개체 분류기(Named Entity Tagger의 분류 체계가 세분되어야 하는데, 기존의 개체 분류기는 한문서 내에서 그 개체의 분류를 시도하기 때문에, 분류를 위한 문맥 정보의 양이 부족하여, 정확하고 상세한 분류를 기대하기 힘들다. 본 논문에서는 동일 개체에 대한 문맥 정보를 수집하기 위해, 그 개체가 나타나는 다른 문서들을 검색하는 개체 피드백 Named Enti쇼 Feedback)이라는 기법을 사용한다. 개체가 상세히 분류됨에 따라 ATT도 확장될 수 있었으며, 이렇게 확장된 ATT상에서의 정답 추출은 baseline보다 약 7%정도의 성능 향상을 보여, 개체 피드백의 효과를 확인할 수 있었다.

• IE interfaces
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• v.8 no.3
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• pp.123-132
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• 1995

첨단생신시스템개발사업과 같은 국가전략으로 추진되는 개발사업에 있어서는, 핵심제품 및 신기술의 연구와 함께 개발성과에 대해 객관적이고 기술적인 평가시스템이 마련되어져야 한다. 본 연구는 이러한 평가시스템을 개발하기 위한 것으로써, 먼저 첨단생산시스템개발사업의 목표달성도를 주요하게 고려하여 평가대상을 시스템, 단위기계, 요소기술, S/W로 분류하고, 개발성과에 대한 평가항목으로 기술성, 신뢰성, 안전성, 경제성을 선정, 내용면에서 평가의 객관성을 보증하고자 하였다. 또한 형식적인 면에서는, 평가의 객관성 및 전문성을 보증하기 위하여 평가형태를 개발수행기업에 의한 자체평과와 위원회에 의한 위원회평가로 나누었으며, 위원회평가를 위해서는 평가자를 기술적으로 지원 할 수 있도록 개발사업에 대한 평가지원 DB시스템을 개발도록 하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.4
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• pp.729-738
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• 2019

In this paper, we propose two-way authentication protocol between unmanned systems in tactical wireless networks in which long distance communications are not guaranteed due to a poor channel conditions. It is assumed that every unmanned systems have same random data set before they put into combat. The proposed protocol generates authentication code(AC) using random data that causes hash collision. The requester for authentication encrypts the materials such as their identifier, time-stamp, authentication code with the secret key. After then the requester transmits the encrypted message to the receiver. The receiver authenticates the requester by verifying the authentication code included in the request message. The performance analysis of the proposed protocol shows that it guarantees the security for various attack scenarios and efficiency in terms of communication overhead and computational cost. Furthermore, we analyzed the effect of the parameter values of the proposed protocol on the performance and suggest appropriate parameter value selection guide according to the level of security requirement.

• Journal of the Korea Society for Simulation
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• v.26 no.1
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• pp.13-19
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• 2017

6-DOF flight simulation program is most generally used M&S tool in domestic missile development procedure. The 6-DOF M&S method, however, cannot validate the performance of a imaging seeker-adopted missile in various conditions. A M&S tool for the analysis of the integrated-flight simulation is required since the tracking performance of the imaging seeker is highly dependent on the missile maneuvering, which introduces the displacement and rotation of the target in the seeker imagery. Through the development of the $3^{rd}$ generation anti-tank missile, Raybolt, the integrated-flight M&S tool was developed and applied to the missile configuration design. It integrates synthetic image generation S/W, imaging tracker, and flight simulation program and computes the main system performance criteria, hit probability by Monte-Carlo Simulation. In this paper, the issues in the $3^{rd}$ generation anti-tank missile configuration and the integrated-flight M&S method and results are described.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2002.05a
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• pp.171-176
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• 2002

자동차 시트 시스템의 개발은 주요한 연구 과제가 되어 왔으며, 이러한 분야의 연구들은 일반적으 로 두 개의 형태로 나누어지는데, 그 첫 번째는 자동차 시트의 위치나 인체 측정학적인 요구 조건에 대한 연구이고, 두 번째는 시트의 안락감 성능에 대한 연구이다. 본 연구는 후자인 시트의 안락감 성능을 평가하기 위한 방법론적인 접근을 하고자 한다. 안락감을 평가하는 방법으로는 크게 정성적인 평가방법과 정량적인 평가 방법이 있다. 과거에는 주로 정성적인 평가방법이 사용되었지만, 최근에는 정량적인 평가 방법들이 많이 개발되어 활용되고 있다. 따라서 이러한 평가 방법들을 체계적으로 분석해 봄으로써 각 방법들에 대한 장ㆍ단점을 이해하고 적절하게 활용하는 가이드라인을 제공하고자 하였다.

• Journal of Aerospace System Engineering
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• v.11 no.3
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• pp.39-46
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• 2017

Required military demands for high reliability of weapons systems throughout stages of life cycles as high technologies combined with weapons systems, research and development continue to drive costs upwards. However, for studies on reliability of national defense weapons systems, empirical research is limited because of a lack of interest or limitations relative to data collection. This study proposes a collection process relative to field operating specifications, based on data relative to experience and management collected by visiting vessels onsite, that operate weapons systems. In addition, after drawing the operating MTBF of the launching system for the Haeseong guided missile launcher, this study compared and analyzed that with values predicted during development and identifies parts with low operating values as compared to predicted values. Results of this study relative to maintenance support troops and weapon systems development companies will contribute to maintaining operational deployment of the launching system of the Haeseong guided weapons system.