• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.944-945
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• 2006

A new tungsten heavy alloy with hybrid structure was manufactured for the kinetic energy penetrator. The tungsten heavy alloy is composed of two parts: core region is molybdenum added heavy alloy to promote the self-sharpening; outer part encompassing the core is conventional heavy alloy to sustain severe load in a muzzle during firing. From ballistic test, it was found that the penetration performance of the hybrid structure tungsten heavy alloy is higher than that of conventional heavy alloy. This heavy alloy is thought to be very useful for the penetrator in the near future.

• 융합보안논문지
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• 제19권2호
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• pp.21-28
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• 2019

제4차 산업혁명 시대로 불리는 초연결-초지능 사회의 출현은 안보 환경의 새로운 변화를 가져왔다. ICT(정보통신기술) 융 복합 하이테크 기술이 전 방위적으로 도입되면서 현실 공간을 움직였던 사람 중심의 동력은 코드를 중심으로 한 사이버 공간으로 대체되고 있으며, 그 의존도는 계속 높아지고 있다. 하지만 이러한 기술적 변화는 역설적으로 우리 사회를 위협하는 또 다른 안보취약점으로 작용하고 있으며, 과학기술이 가져온 기회와 도전을 동시에 직면하며 사이버 방어체계를 구축해야 하는 당위성을 가져왔다. 이에 본 연구에서는 갈수록 지능화되고 대규모로 진화하고 있는 사이버 공격에 적극적으로 대응할 수 있는 이론적 근거로 정당방위 이론을 제시하였고, 이에 대한 자주적 사이버 안보전략 수립 방향으로 첫째, 사이버 안보법 제정의 필요성 둘째, 미국 등 사이버 강대국들과의 대응공조 체계 마련 셋째, 사이버 인력을 어떻게 양성할 것인가에 대한 방안 마련을 제언하였다.

• 유통과학연구
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• 제15권1호
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• pp.83-93
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• 2017

Purpose - After the transition, the development of defense industry in Eastern Europe has been regressed. Recently, they have internationally recognized that new products have been exported and contributed to the Innovation-Based Manufacturing of national economy such as unmanned reconnaissance aircraft, water purification technology, and mobile chemical laboratory, etc. The military forces in Eastern Europe are re-armed by the localization of self-produced munitions in their own defense industry, and then emphasize fostering their own defense industry. Thus, if they make a collaboration with other nations as a industrial cluster, it will gain a competitive edge on the defense industry. Research design, data, and methodology - The study was designed with the data of each national defense department. The research of the subject was reviewed before and after the transition. Thousands of workers have worked in defense industries before the transition, however, the defense industry and experts left after the transition. The Hungarian defense spending on GDP also dropped sharply from 1.72% in 2000 to 0.85% in 2013. But, due to the crisis in Ukraine and the crisis of Syrian refugees, the Viségrad Group (V4) member countries have also increased their interest in a defense and industries as well as the confidence in the EU and NATO. Results - On the whole, the joint of military training and purchase of defense materials were found in order to form the EU cooperative combat troops in CEE. There are the implementation of a joint manual plan for strengthening V4 security policy and the joint military exercises for V4 every year, and the others are electronic warfare and innovation of V4 national forces. Through such a performance analysis methodology, we found that the defense industry is developed through the national cluster cooperation among CEEs and spreading global distribution. Conclusions - Eastern Europe and Balkan countries have been looking forward to cooperating with the non-EU countries such as Korea and other defense industries. There are a lot of potential development into a new civilian cooperation defense industry for global-distribution. Thus, Korea should develop electronic commercial applications, not just as a weapon exporting region.

• Journal of Ceramic Processing Research
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• 제13권spc2호
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• pp.198-201
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• 2012

The electrolytes in thermal batteries are nonconductive solids at ambient temperature, which prevent the self-discharge and corrosion. To meet severe environmental requirements and guarantee acceptable handling yields, all the pellets in cells should have adequate strength, especially for the cathodes due to their poor binding properties among FeS2 particles. By modifying the surface microstructure of FeS2 through molten-salt heat treatment, the inter-particle binding strength is greatly increased, resulting in the enhanced pellet strength and yield. The addition of Li2O also promoted the soft salt coating coverage of hard FeS2 particles, which can be explained by the enhanced wettability of the molten salt.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.47.6-47
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• 2001

In this paper a new indirect robust self-tuning regulator is proposed including an inverse system of a plant and a robust compensator such that it achieves the desired frequency shape specified by solving the mixed H$\infty$ sensitivity problem within a prescribed tolerance in the H$\infty$ norm. Consequently, in the proposed self-tuning regulator, robust stability is guaranteed in spite of the identification error.

• 경영과정보연구
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• 제35권1호
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• pp.23-50
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• 2016

본 연구의 목적은 국방 지식공유시스템인 '이지샘' 사용자들의 지식제공행위에 영향을 주는 요인들을 조사함으로써 국방지식공유시스템 사용의 활성화를 위한 시사점을 제공하는데 있다. 국방부에서는 '이지샘'이라는 지식공유시스템을 구축하여 구성원들의 지식공유와 지식의 활용을 돕고 있다. 하지만, '이지샘'사용의 활성화 정도는 제한적이며 사용 활성화를 위한 실증적인 연구 또한 부족한 실정이다. 따라서 본 연구는 '이지샘'에 지식을 제공하는 조직구성원의 행위에 영향을 주는 요인을 연구하였다. 행위의 동기 기회 능력이론에 근거하여 국방 지식공유시스템에 지식을 제공하는 행위에 영향을 주는 동기요인으로 '돕는 즐거움'과 '보상기대일치'를, 기회요인으로 '시스템 접근성'을, 능력요인으로 '자기전문가 인식'과 '관련분야 경력'을 적용하여 연구모형과 가설을 제시하였다. 또한, 이들 변수관계에서 '시스템 사용 자발성'의 조절효과를 검증하기 위한 가설도 포함하였다. 설문분석 결과, '돕는 즐거움'과 '보상기대 일치'(동기요인), '시스템 접근성'(기회요인), '자기전문가 인식'(능력요인)은 '이지샘' 시스템상의 지식제공행위에 긍정적인 영향을 주는 것으로 밝혀졌다. 하지만 '해당분야 근무기간'은 유의한 영향이 없는 것으로 나타났다. 자발성의 조절효과는 '돕는 즐거움', '관련분야 경력', '시스템 접근성'과 지식제공 행위와의 관계에서 유의하게 나타났다. 본 연구는 이론적 측면에서 국방 지식공유시스템 상에서 사용자의 지식제공행위에 영향을 주는 결정요인들을 동기 기회 능력요인 측면에서 제시하였다는 것이며, 실무적으로는 국방 지식공유시스템의 사용을 활성화하기 위해 관리자와 국방시스템 설계자가 관심을 가져야 할 요인들을 실증하였다는데 의의가 있다.

• Strategy21
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• 통권40호
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• pp.5-36
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• 2016

Recently, the Japanese government revised the three guidelines of its security policy, the National Security Strategy(NSS), the National Defense Program Outline and Midterm Defense Buildup Plan, exceptionally at one time. This means Japan has been seeking the new strategy and strengthening military power considering changing regional security environment. Moreover, Japan revised the security laws for the right to collective self-defense, which authorized the use of force even when Japan is not under attack. Also, Japan renewed the Guidelines for Japan-U.S. Defense Cooperation in twenty years, and has expanded JSDF's scope of activity to a worldwide level. These changes imply Japan would constantly seek to build military forces focusing on naval forces. Because Japan's naval forces, the JMSDF is the means that allow Japan to use its force at anywhere overseas and expand its roles and missions in international society by the basis of the right to collective self-defense. This research will analyze Japan's new maritime strategy and trend of force development and eventually look for the implication on our maritime security These days, Japan has perceived Chinese rapid increase of naval power and pursuing of maritime hegemony as a grave threat. In response to this, Japan is designing new maritime strategy, which are "remote islands defense and recapture" and proactively develop a new type of naval forces to accomplish this new strategy. The Japan's "remote island defense and recapture strategy" is to harden its defensive posture in Nansei islands which correspond to China's 1st island chain for chinese A2/AD strategy and directly encounter with China and to protect its own dominium and maritime interest while supporting US national strategy in East Asia. Japan continues to build compact, multi-functional ship to accomplish "remote island defense and recapture strategy" and keep strengthening its maritime power projection capability to include build of new amphibious ship, and large, multi-functional ship which can provide effective C2. These changes imply that Japan is shifting its strategy from passive and defensive to proactive and aggressive way and continues to pursue naval buildup.The implication of Japan's new maritime strategy and naval buildup needs to be observed carefully and we need to keep developing naval power required to protect our maritime sovereignty and interest.

• 한국분말재료학회지
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• 제25권2호
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• pp.109-119
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• 2018

The objective of this study is to reveal the sintering mechanism of mixed Ti-6Al-4V powders considering the densification and the homogenization between Ti and Al/V particles. It is found that the addition of master alloy particles into Ti enhances densification by the migration of Al into the Ti matrix prior to the self-diffusion of Ti. However, as Ti particles become coarser, sintering of the powders appears to be retarded due to slower inter-diffusion of the particles due to the reduced surface energies of Ti. Such phenomena are confirmed by a series of dilatometry tests and microstructural analyses in respect to the sintering temperature. Furthermore, the results are also consistent with the predicted activation energies for sintering. The energies are found to have decreased from 299.35 to $135.48kJ{\cdot}mol^{-1}$ by adding the Al/V particles because the activation energy for the diffusion of Al in ${\alpha}-Ti$ ($77kJ{\cdot}mol^{-1}$) is much lower than that of the self-diffusion of ${\alpha}-Ti$. The coarser Ti powders increase the energies from 135.48 to $181.16kJ{\cdot}mol^{-1}$ because the specific surface areas of Ti decrease.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권10호
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• pp.2862-2882
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• 2023

With the development of networking technology, it has become common to use various types of network services to replace physical ones. Among all such services, electronic voting is one example that tends to be popularized in many countries. However, due to certain concerns regarding information security, traditional paper voting mechanisms are still widely adopted in large-scale elections. This study utilizes blockchain technology to design a novel electronic voting mechanism. Relying on the transparency, decentralization, and verifiability of the blockchain, it becomes possible to remove the reliance on trusted third parties and also to enhance the level of trust of voters in the mechanism. Besides, the mechanism of blind signature with its complexity as difficult as solving an elliptic curve discrete logarithmic problem is adopted to strengthen the features related to the security of electronic voting. Last but not least, the mechanism of self-certification is incorporated to substitute the centralized certificate authority. Therefore, the voters can generate the public/private keys by themselves to mitigate the possible risks of impersonation by the certificate authority (i.e., a trusted third party). The BAN logic analysis and the investigation for several key security features are conducted to verify that such a design is sufficiently secure. Since it is expected to raise the level of trust of voters in electronic voting, extra costs for re-verifying the results due to distrust will therefore be reduced.

• 품질경영학회지
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• 제47권2호
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• pp.217-236
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• 2019

Purpose: This article aims 1) to identify key elements for building quality culture, 2) to design and analyze survey data from defense industry companies, and 3) to suggest directions for enhancing quality culture levels. Methods: Key elements and items for a quality culture are derived by investigating related references and using affinity diagram. Questionnaire items to investigate the quality culture level of the organizations are prepared and the survey data on the level of quality culture of military defense companies are analyzed. Results: 1) Descriptive statistical analyses are presented to compare the levels of the six key elements. 2) In each element items with low scores are identified, which should be improved. 3) Among six key elements, 'support 'element shows lowest level. 4) The quality culture level of the small-sized companies are relatively low. Conclusion: 1) To improve the quality culture level of the defense industry companies, it is necessary to provide quality education, to enhance recognition and rewards, and to invest resources for employees' self-development. 2) Small-sized companies can easily be adapted to quality-oriented cultural change if the CEO leadership focuses on quality culture.