• Journal of Magnetics
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• 제19권2호
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• pp.146-150
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• 2014

The objective of this paper is to provide a comparison between two transverse flux rotary machines (TFRM) with different topologies of stator cores. Depending on how to make stator core with laminated steel sheets, the one topology is 'perpendicular stacking core' and the other is 'separated core'. Both of the two cores have been designed considering 3-dimensional (3-D) magnetic flux path with the same output power conditions, but the core losses are quite different and it causes different magnetic and thermal characteristics. For comparison of these two topologies of stator cores, therefore, core losses have been calculated and used as a heat source in no-load conditions, and the thermal stress has been also calculated. 3-D finite element method has been used for the magnetic field, thermal, and stress analysis to consider the 3-D flux path of the TFRM. After comparing the analysis results of the two topologies, experimental results are also presented and discussed.

• International Journal of Aerospace System Engineering
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• 제2권1호
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• pp.38-42
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• 2015

This work is to propose a structural design and analysis procedure for development of the low noise 1kW class small wind turbine system which will be applicable to relatively low speed region like Korea and for the domestic use. The proposed structural configuration has a sandwich composite structure with the E-glass/Epoxy face sheets and the Urethane foam core for lightness, structural stability, low manufacturing cost and easy manufacturing process. Structural analysis including load cases, stress, deformation, buckling, vibration and fatigue life was performed using the Finite Element Method, the load spectrum analysis and Miner rule. In order to evaluate the designed structure, the structural test was carried out and its test results were compared with the estimated results. Moreover Investigation on structural safety of tower was verified through structural analysis by FEM.

• 한국IT서비스학회지
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• 제14권2호
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• pp.275-287
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• 2015

Information technology (IT) convergence have been recognized one of the key drivers in the industry perspective. Especially, IT convergence have been one of the most important innovative way for defense sector. Korea government established IT convergence policy in 2008 and have been applying it to the core industry such as automotive, shipbuilding and defense industries. Recently, the creative vitamin project has been launched. Vitamin 'D' means the way to create the value of defense industry. This research analyzes and evaluates various IT convergence business models based on an operation of defense IT convergence center from 2011 to 2014, which is the industry IT convergence centers. Defense IT convergence business models can be classified into four types of mission area as follows : weapon acquisition and management, military intelligence, military power construction, and resources management. We define the concept of defense IT convergence and describe the framework and processes for applying IT to the defense sector. We analyzes and evaluates various business models designed through defense IT convergence framework and processes.

• 한국IT서비스학회지
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• 제11권sup호
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• pp.17-26
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• 2012

Information technology convergence has been recognized one of the key drivers in the industry perspective. Korea government established IT convergence policy in 2008 and has been implementing it to the core industry such as automotive, shipbuilding and defense industries. This research analyzes various IT convergence issues based on an operation of defense IT convergence center, one of the industry IT convergence centers. Defense IT convergence issues are as follows : the methods for introducing rapid changing IT to military area, rapid deployment procedures of verified commercial technologies and products, regulations for using of domestic software promotion and so on. We define the concept of defense IT convergence and propose the framework and processes for applying IT to our defense sector as one of industries. Also, we establish various business models in the military perspective using defense IT convergence framework. In this paper, we focus the development of defense IT convergence through the alignment of national IT convergence policy and propose various business models established through operating a defense IT convergence center.

• International Journal of Contents
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• 제2권2호
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• pp.6-9
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• 2006

The style of war in the $21^{st}$ century became digitalized cooperative union tactic, which relies heavily on the system providing real time information. Critical information is provided during the war from sensing to shooting. Therefore, epochal development in observation, reconnaissance (ISR), commanding (C4I) and precision strike (PGM) are necessary. Application of ubiquitous computing and network technologies in national defense is necessary for carrying out with various types of wars in the $21^{st}$ century. Therefore, the author wants to research core technology sector that can be developed and applied in preparation of ubiquitous national defense era. Also plans for applying recent u-Defense technology to the military sector had been suggested. Particularly, the author have suggested plans for utilizing combined future information technologies such as ad-hoc network, RFID for the logistic supply in construction of u-Defense system. By utilizing these information technologies, combat power and strategic capabilities of the military can be enhanced greatly.

• 한국산학기술학회논문지
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• 제22권6호
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• pp.524-533
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• 2021

최근 무기체계 핵심부품 개발 필요성 증가 등으로 인해 무기체계 부품국산화 개발사업이 확대되고 있다. 개발된 핵심부품의 국내 무기체계 적용 및 해외시장 진출을 위해 사전 기술동향을 반영한 과제기획이 필요한 실정이다. 이에 본 연구는 무기체계 핵심부품 국산화 대상과제의 특허 조사 및 분석을 통한 부품국산화 개발기술 동향을 도출하였다. 또한 개발기술 동향 분석결과를 과제 선정 시 활용하기 위한 구체적인 방안을 제시하였다. 연구의 세부 추진 방법으로 2019년 선정된 과제 관련 특허를 조사하여, 최초 출원 시점부터 현재까지의 특허의 연도별 출원수, 출원인수를 분석하였다. 이를 종합하여 시계열에 따른 기술시장 성장단계를 도출하였다. 2019년 과제선정 시 산출된 선정기준 가중치를 이용하여 기술시장 성장단계와 부품국산화 과제선정 기준을 양축으로 하는 Matrix를 구성하였다. 각 영역별 배치된 부품국산화 기술의 포트폴리오 분석을 실시하였으며, 그 결과 Matrix 영역별 기술을 배치하고 해당 영역의 종합적인 기술동향을 분석하였다. 향후 효과적인 과제기획을 위해 기술동향 분석결과의 활용을 위한 절차개선 방안을 제안하였으며, 이를 통한 효율적인 과제기획 및 효과적인 국내 방위산업 중소기업 육성지원이 기대된다.

• 정보처리학회논문지D
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• 제12D권5호
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• pp.729-736
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• 2005

현재 국방부에서는 국방정보체계간 상호운용성을 보장하기 위해 아키텍처산출물을 쉽고 일관성이 있게 개발할 수 있는 국방아키텍처프레임워크와 개발된 아키텍처산출물을 저장하는 핵심아키텍처데이터모델을 개발하였다. 국방아키텍처프레임워크에 정의된 기술참조모델과 표준프로파일 산출물은 정보기술아키텍처의 핵심 부분이며 상호운용성 보장의 핵심 요소이다. 본 논문에서는 기술참조모델과 표준프로파일의 기술서비스와 표준을 관리하는 알고리즘과 시스템을 개발하였다. 이를 통해 기술참조모델과 표준프로파일 산출물의 효율적인 작성 및 관리와 정보체계간의 상호운용성 보장의 기반을 제공할 수 있다.

• 한국산학기술학회논문지
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• 제16권10호
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• pp.7196-7203
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• 2015

본 연구의 목적은 항공기 재밍장비의 핵심 부품으로 재밍신호를 재송신할 수 있는 디지털고주파기억장치 개발 기술의 가치를 평가하는 것이다. 본 논문에서는 국방기술품질원에서 국방기술에 대한 가치평가를 위해 개발한 수익접근법 기반의 "국방기술 가치평가 방법론(DTV)"을 사용하여 가치평가를 하였다. 가치평가 결과에 따르면, 디지털고주파기억장치 개발 기술에 대한 경제적 가치는 8.54억 원으로 평가되었고, 국방기술의 특수성을 고려한 공익적 가치승수는 0.7899로 평가되어 공익적 가치는 6.75억 원으로 산출되었다. 개발 기술의 최종 가치는 15.29억 원으로 평가되었다.

• Nano
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• 제13권11호
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• pp.1850126.1-1850126.10
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• 2018

Flexible strain sensors, as the core member of the family of smart electronic devices, along with reasonable sensing range and sensitivity plus low cost, have rose a huge consumer market and also immense interests in fundamental studies and technological applications, especially in the field of biomimetic robots movement detection and human health condition monitoring. In this paper, we propose a new flexible strain sensor based on thick CVD graphene film and its low-cost fabrication strategy by using the commercial adhesive tape as flexible substrate. The tensile tests in a strain range of ~30% were implemented, and a gage factor of 30 was achieved under high strain condition. The optical microscopic observation with different strains showed the evolution of cracks in graphene film. Together with commonly used platelet overlap theory and percolation network theory for sensor resistance modeling, we established an overlap destructive resistance model to analyze the sensing mechanism of our devices, which fitted the experimental data very well. The finding of difference of fitting parameters in small and large strain ranges revealed the multiple stage feature of graphene crack evolution. The resistance fallback phenomenon due to the viscoelasticity of flexible substrate was analyzed. Our flexible strain sensor with low cost and simple fabrication process exhibits great potential for commercial applications.

• 시스템엔지니어링학술지
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• 제15권2호
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• pp.98-107
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• 2019

The defense system development process is a process of developing various systems that perform functions in various functional areas such as battlefield awareness, command control, force application, and logistical support. In other words, the defense system development process is a process of developing many systems simultaneously in various functional areas. Various systems developed through this process should be interoperable so that they can be integrated and operated in a joint warfighting environment. To successfully implement this, the US Department of Defense uses the Joint Capability Integrated Development System(JCIDS) for the defense system development, and within this JCIDS processes the Capability Based Assessment(CBA) methodology as its core technology. This CBA methodology transforms the mission activity requirements to functional capability requirements logically and transforms the functional capability requirements to system requirements logically also. Smart City is a city that improves the convenience and quality of life of the citizen by integrates various systems that perform various functions of the city and smarties various functional systems with smart services by using IT technology. In other words, defense system development and smart city development have a common feature of the process of developing many systems simultaneously in various functional areas. In order to address the problem of having to develop many systems simultaneously in each functional area, it is important to logically transform the various mission scenarios into functions and logically transform the functions into systems. Therefore, a joint capability integrated development system and its core methodology, Capability Based Assessment(CBA), can be applied to smart city development. This paper proposes a method for performing a smart city concept design method using the capability based evaluation (CBA) method.