• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2003년도 한국우주과학회보 제12권2호
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• pp.46-46
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• 2003

Since its launching on 21 December 1999, the KOrea Multi-Purpose SATellite-Ⅰ (KOMPSAT-Ⅰ) has been successfully operated by the Mission Control Element (MCE), which was developed by the Electronics and Telecommunications Research Institute (ETRI). Most of the major functions of the MCE have been successfully demonstrated and verified during the three years of the mission life of the satellite. The Mission Analysis and Planning Subsystem (MAPS), which is one of the four subsystems in the MCE, played a key role in the Launch and Early Orbit Phase (LEOP) operations as well as the on-orbit mission operations. This paper presents the operational performances of the various functions in MAPS. We show the performance and analysis of orbit determinations using ground-based tracking data and GPS navigation solutions. We present four instances of the orbit maneuvers that guided the spacecraft from injection orbit into the nominal on-orbit. We include the ground-based attitude determination using telemetry data and the attitude maneuvers for imaging mission. The event prediction, mission scheduling, and command planning functions in MAPS subsequently generate the spacecraft mission operations and command plan. The fuel accounting and the realtime ground track display also support the spacecraft mission operations. We also present the orbital evolutions during the three years of the mission life of the KOMPSAT-Ⅰ.

• 한국산학기술학회논문지
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• 제21권3호
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• pp.399-406
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• 2020

대한민국 육군이 창군 이후부터 무기체계의 운용유지를 위해서 책자형 기술교범을 개발하여 운용하였으나, 최신 무기체계가 개발 될수록 방대한 분량으로 인하여 효율적인 운용이 제한되었다. 이에 대한 대책의 하나로서 방위사업청에서 관리하는 KAIS 개발도구를 적용하여 전자식 기술교범을 2003년부터 현재까지 개발하여 운용하고 있다. 하지만 16년이 지난 현재까지도 소프트웨어 불안정 등의 이유로 운용자에게 외면당하고 있었다. 이에 육군본부 시험평가단 운용시험평가 결과와 분석평가단 분석 결과를 중심으로 분석한 결과 소프트웨어(Application)는 Wed 기반에서 사용 시 추가 기능 설치의 번거로 움과, 버전별 호환성이 없어서 효율성이 떨어지고, 확장성이 없어서 통합운용이 제한되며, Off-Line 운용방식으로 실시간 업데이트가 이루어지지 않고 CD를 통한 부대별 수정 등으로 시급히 KAIS 개발도구 개선이 필요한 것으로 확인되었다. 따라서 본 논문에서는 현재 육군 전자식 기술교범의 근본적인 문제점을 해결하기 위해서 1차는 관련 연구를 통하여 선진국 및 육군의 전자식 기술교범의 개발 동향과 운용실태를 확인한 후 국내 운용시험평가 결과와 분석평가단 분석결과를 중심으로 육군의 무기체계에 맞는 전자식 기술교범의 규격서 개선방안을 제시하고, 2차는 전자식 기술교범을 중심으로 종합군수지원 11대 요소를 연계한 운용시험평가 개선 방안을 제시하고자 한다.

• 통상정보연구
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• 제18권4호
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• pp.263-281
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• 2016

본 연구는 국제 통상 협상에서의 경쟁력 강화를 위한 전략으로서의 표준특허의 확보 중요성과 그 대응책을 모색하기 위한 연구로서, 다양한 자료들을 분석하여 정책적 시사점을 제시하는 것을 그 목적으로 한다. 표준특허 확보의 중요성은, 표준특허의 선정과 관리를 효율적으로 운영함과 동시에, 제정 표준이 그 역할을 제대로 하도록 지속적으로 모니터링하여 이용자의 편의를 증진시킴으로써, 지원 기관의 지원 목적을 달성하고, 향후 국가 신산업 성장 동력의 새로운 기반으로 기능할 수 있도록 선순환 구조화를 통해, 표준을 제정한 의미를 제고함과 동시에, 국제통상 경쟁력의 새로운 원천수단으로 삼는 데에 있다. 이를 위해서는 국가적으로 지속적인 제도적 지원과 아울러 다양한 특허 창출 전략별 지원책이 각 Phase별로 특화되어 세부적으로 도입되어져야 하며, 특히 개별 중소중견기업과 연구소 자체 인력만으로는 상대적으로 어려운 국제 특허 동향과 표준화 현황, 국제표준화기구들과의 다양한 정보의 획득과 확산을 정부 섹터에서 맡아, 실질적인 산관학 협력을 통하여 관련 지원성과가 단계별로 창출될 수 있도록 제도화하여야 한다. 특히 기존 경쟁력 우위 산업분야의 표준특허 창출 연구는 대기업과 정부출연연이 진행하고, 4차산업혁명 및 신성장동력 (예: Block Chain, Fin-Tech 외) 산업 분야는 역량있는 중소중견기업과 대학 연구소가 주축으로 표준특허 창출 연구를 진행하는 맞춤형 전주기적 관리 모델을 정립하고 장기적으로 이의 실행을 모니터링하여 지식재산 정책의 효율성을 제고함으로써, 궁극적으로 통상 협상의 경쟁력을 강화하여, 표준특허의 창출과 관리가 향후 급변하는 국제정세 속에서의 통상 경쟁력의 핵심 요인으로 기능할 수 있도록 확보전략을 마련해야 한다.

• 한국수소및신에너지학회논문집
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• 제24권3호
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• pp.223-229
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• 2013

Polymer Electrolyte Membrane Fuel Cell (PEMFC) is a power generation system to convert chemical energy of fuels and oxidants to electricity directly by electrochemical reactions. As a catalyst support for PEMFCs, carbon black has been generally used due to its large surface area and high electrical conductivity. However, under certain circumstances (start up/shut down, fuel starvation, ice formation etc.), carbon supports are subjected to serve corrosion in the presence of water. Therefore, it would be desirable to switch carbon supports to corrosion-resistive support materials such as metal oxide. $TiO_2$ has been attractive as a support with its stability in fuel cell operation atmosphere, low cost, commercial availability, and the ease to control size and structure. However, low electrical conductivity of $TiO_2$ still inhibits its application to catalyst support for PEMFCs. In this paper, to explore feasibility of $TiO_2$ as a catalyst support for PEMFCs, $TiO_2$ nanofibers were synthesized by electrospinning and calcinated at 600, 700, 800 and $900^{\circ}C$. Effects of calcination temperature on crystal structure and electrical conductivity of electrospun $TiO_2$ nanofibers were examined. Electrical conductivity of $TiO_2$ nanofibers increased significantly with increasing calcination temperature from $600^{\circ}C$ to $700^{\circ}C$ and then increased gradually with increasing the calcination temperature from $700^{\circ}C$ to $900^{\circ}C$. It was revealed that the remarkable increase in electrical conductivity could be attributed to phase transition of $TiO_2$ nanofibers from anatase to rutile at the temperature range from $600^{\circ}C$ to $700^{\circ}C$.

• 자원ㆍ환경경제연구
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• 제30권1호
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• pp.129-167
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• 2021

배출권거래제는 온실가스 감축과 저탄소 사회로의 전환을 위한 핵심 정책이다. EU 배출권거래제(EU ETS)는 운영기간, 핵심 설계 노하우 등에서 국내 배출권거래제보다 앞서 있는 좋은 벤치마크 대상이다. 이에 본 연구는 EU ETS 4기의 주요 제도 설계를 배출허용총량(Cap), 배출권 무상할당방식, 유·무상할당업종 선정 방식, 시장안정화 조치, 감축지원제도 등을 중심으로 살펴보았다. 그리고 EU ETS 1-4기의 주요 설계와 주요 설계 변경이 향후 국내 배출권거래제의 설계 및 운영에 미칠 영향을 각각 분석해보았다. 우선, 국내 배출권거래제 설계에 대한 영향으로는 벤치마크 갱신 방안 마련, 국내 산업구조 및 특성을 반영한 무상할당업종 선정 기준 마련과 2단계 평가 도입, 경매 수익의 구체적 활용방안 마련의 세 가지 요구가 증대될 것으로 예상된다. 다음으로 향후 배출권거래제 운영에 미칠 영향으로는 제도 개정의 객관적이고 심도있는 영향평가, 계획 및 제도 개정의 이른 확정을 통한 제도 안정성 및 대응 기회 제공, 배출권 거래제 거버넌스 조정 및 이해관계자 참여 확대 유도 세 가지를 들 수 있다.

• Journal of Electrical Engineering and Technology
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• 제1권2호
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• pp.241-245
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• 2006

In this paper, the design and characteristics of a $\pi-shaped$ ultrasonic motor that is applicable to optical zoom operation of a lens system for mobile phones are investigated. Its design and simulation of performances are carried out by FEM (finite element method) commercial software. As a simulation result, by applying voltage with single phase, a combined vibration is produced at the surface of a stator arm. A prototype of the motor is fabricated and its outer size is $8*4*2mm^3$ including the cylindrical steel rod of 2 mm in diameter as the rotor. The motor exhibits a maximum speed of 500 rpm and a power consumption of 0.3 W when driven at 20 Vpp and 64 kHz.

• Nuclear Engineering and Technology
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• 제53권2호
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• pp.455-465
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• 2021

The Molten Salt Reactor (MSR), one of the six advanced reactor types of the 4th generation nuclear energy systems, has many impressive features including economic advantages, inherent safety and nuclear non-proliferation. This paper introduces a system analysis code named TREND, which is developed and used for the steady and transient simulation of MSRs. The TREND code calculates the distributions of pressure, velocity and temperature of single-phase flows by solving the conservation equations of mass, momentum and energy, along with a fluid state equation. Heat structures coupled with the fluid dynamics model is sufficient to meet the demands of modeling MSR system-level thermal-hydraulics. The core power is based on the point reactor neutron kinetics model calculated by the typical Runge-Kutta method. An incremental PID controller is inserted to adjust the operation behaviors. The verification and validation of the TREND code have been carried out in two aspects: detailed code-to-code comparison with established thermal-hydraulic system codes such as RELAP5, and validation with the experimental data from MSRE and the CIET facility (the University of California, Berkeley's Compact Integral Effects Test facility).The results indicate that TREND can be used in analyzing the transient behaviors of MSRs and will be improved by validating with more experimental results with the support of SINAP.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.185-185
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• 2009

Micropump is very useful component in micro/nano fluidics and bioMEMS applications. Using the flexural vibration mode of PZT bar, a piezopump is successfully made. The PZT bar is polarized with thickness direction. The proposed structure for the piezo-pump consists of an input and an output port, piezoelectric ceramic actuator, actuator support, diaphragm. The traveling flexural wave along the bar is obtained by dividing two standing waves which are temporally and spatially phase shifted by 90 degrees from each other. Fluid is drawn into a forming chamber, eventually the forming chamber closes trapping the fluid therein. The finite elements analysis on the proposed pump model is carried out to verify its operation principle and design by the commercial FEM software. Components of piezopump were made, assembled, and tested to validate the concepts of the proposed pump and confirm the simulation results. The performance of the proposed piezopump the highest pressure level of 83.4kHz.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 1999년도 학술대회지 vol.1
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• pp.277-299
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• 1999

Since Chrysler Motor Co. had experienced the digital development system in the beginning of 1990's, most of leading automobile companies are trying to apply a digital information system for their own business process reengineering based upon concurrent engineering system from product planning phase. This is called as virtual DMU(Digital Mock-Up) system instead of the traditional PMU(Physical Mock-Up) system. By using the virtual prototype, all of the design requirements and system specifications can be checked, changed and optimized more quickly and more efficiently. This paper consists of five chapters for the DMU information system. In the 1$^{st}$ chapter, the principle of digital design system is suggested by using four basic modules such as product design module, process design module, manufacturing system design module and central control module. The basic scheme of DMU is introduced with the benefits of application in the chapter 2. In the chapter 3, a digital design process of new car development is explained with the detailed DMU design and design review processes. In the chapter 4, the practical DMU manufacturing techniques and applications are introduced as CAD/CAM analyses, DPA(Digital Pre-Assembly)reviews for development, production, operation and maintenance phases, digital tolerance analyses and digital factory analyses for assembling line simulation, automated robot welding processes, production jig ＆ fixtures and painting process simulation. Finally, the activities of digital design support; CAS-styling, CAE-engineering and CAT-testing are summarized for design optimization in the chapter 5. As today's automobile manufactures and related business organizations are struggling to compete in the global marketplace, they are concentrating on efficient use of DMU information system to reduce the new car development cost, to have shorten the delivery schedule and to improve product design quality. To meet the demand of those automobile industries on digital information systems, the CALS(Computer aided Acquisition and Logistics Support) and EC(Electronic Commerce)initiative has been focused as a dominant philosophy in defense ＆ commercial industries, specially automobile industries.s.

• 한국압력기기공학회 논문집
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• 제7권3호
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• pp.8-14
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• 2011

The clogging of the flow area at the tube support plates(TSPs), especially at the upper TSPs results in the water level oscillation of a steam generator during normal operation. A reduction of the TSP flow area causes to increase in pressure drop within the two-phase flow zone, which destabilizes the boiling flow through the tube bundle. This phenomenon was occasionally observed at a few domestic and foreign nuclear power plants. One of the methods for defining the flow area clogging is visual inspection, which is the most effective inspection method. The results of the visual inspection for TSPs' flow area are clogging images on TSPs' quartrefoil lobes. These images are complexly distorted due to lens aberration and external factors like the distance to a subject and angle etc. In this work, we developed the analysis algorithm for clogging image of the TSP flow area of steam generators. For this purpose, we designed an image verification device applicable to the camera employed in the field for visual inspection and then, we demonstrated the validity of image analysis algorithm by using this device and commercial autoCAD program.