• Aerospace Engineering and Technology
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• v.3 no.1
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• pp.86-96
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• 2004

Space environment has various hazard effects on satellite. These effects can not be experienced in earth ambient condition. In terrestrial space, plasma or atomic oxygen could erode satellite surface. Also ultra violet or particle radiation may damage surface materials or electronic parts which constitute satellite. So, in designing satellite, the natural environment of operational orbit should be investigated and appropriate mitigation should be prepared.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.664-666
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• 2001

사용자의 다양한 요구사항에 따른 소프트웨어 구조의 방대함과 복잡함으로 인하여 소프트웨어 부품을 재사용 하는 방식의 컴포넌트 개발 방법이 최근 각광을 받고 있다. 이런 추세에 맞추어 IBM, SUN, 한국2전자통신연구원 등의 여러 기관에서 공용 컴포넌트 개발, 컴포넌트 생성 및 조립기술, 컴포넌트 시험 및 품질평가 기술, 컴포넌트 유통기술 등의 컴포넌트 관련 기술 사업을 추진 중에 있다. 특히 특정 영역에서 공통으로 사용될 수 있는 공용 컴포넌트를 개발하여 공용 컴포넌트 은행에 저장하고, 컴포넌트 사용의 공영 체제를 구축하는 것은 급변하는 사용자의 요구에 따른 소프트웨어 시장 변화에 신속하게 대처할 수 있는 중요한 방안이라 할 수 있다. 이 논문에서는 EJB(Java Enterprise Beans)컴포넌트 은행 구축 시 사용자의 요구사항에 적합한 컴포넌트를 선택하고 해당 컴포넌트에 대한 올바른 이해를 돕는데 중요한 확장된 EJB 컴포넌트 명세를 제안한다.

• Review of KIISC
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• v.29 no.4
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• pp.19-24
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• 2019

디지털 전환(Digital Transformation)은 산업 각 분야에서 진행되고 있는 혁신이며, 금융권에서도 디지털 전환의 영향이 크게 미치고 있다. 전산화 되어 있지만 폐쇄적인 네트워크로 구축되어 있던 금융 네트워크가 점점 데이터의 공개를 필요로 하였으며, 그 공개된 데이터를 기반으로 새로운 서비스가 창출되는 산업적 태동이 있었다. 개별적 서비스의 처리나 단계(부품)의 개선이 아니라 플랫폼의 개방을 통한 융합화와 이를 조화롭게 통제하는 거버넌스의 필요성이 대두되었다. 이러한 동향에 편승하여 새로운 기업(스타트업)이 창출하였고, 공개된 정보를 기반으로 융합 서비스를 창출하여 서비스의 발전이 눈부시게 진행하고 있다. 핀테크 서비스가 공개 API(Application program interface)로 제공되고 있으며, 이를 이용하여 빠른 발전을 하고 있으나, 공개성으로 인하여 취약점마저도 공개되어 정보보안의 위협으로 작용 될 수 있으므로, 개방형 플랫폼의 정보보안을 중심으로 핀테크 정보보안 표준의 동향을 살펴본다.

• Resources Recycling
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• v.28 no.1
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• pp.3-14
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• 2019

Copper is used in many electronic components and construction parts due to its excellent electrical conductivity and heat transfer characteristics, and also used for pre-plating for double layer coating such as nickel, so that copper is an essential material in modern industry. Despite the expected increase of usage and importance on wiring, sensors and data equipment in the next generation industries, it is hard for securing stable copper supply and resource management resulting from the copper prices are fluctuating owing to the economic crisis in Europe, the low economic growth trend in China, and President Trump's commitment to public industrial facilities investment in U.S.. Since most of the domestic copper consumption is used by electrolytic copper cathode, we studied not only copper recycling technology which is being commercialized but also current research trend under the research stage. This study aims to examine the characteristics of each process and the areas where future recycling technology development is required.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.45 no.3
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• pp.1-5
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• 2008

This paper analyzes on the radiation effect of silicon solar cells in a low Earth orbit satellite by using high energy electron beams. Generally, the satellite circling round in a low orbit go through Van Allen belt, in which electronic components are easily damaged and shortened by charged particles moving in a cycle between the South Pole and the North Pole. For example, Single Event Upset (SEU) by radiation could cause electronic devices on satellite to malfunction. From the ground experiment in which we used the high energy electron beam facility at Knrea Atomic Energy Research Institute (KAERI), we tried to explain sun sensor degradations on orbit could he caused by high energy electrons. While we focused on the solar cells used for light detectors, We convince our research also contributes to understand the radiation effect of solar cells generating electric powers on satellites.

• Aerospace Engineering and Technology
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• v.8 no.1
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• pp.66-72
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• 2009

In order to verify the operability of a GPS receiver which is one of the KSLV-I onboard electrical equipments under the vacuum conditions, this paper describes the operation methods and performance results of the GPS receiver under the thermal-vacuum and vacuum environments. The damages and degradations of electrical parts of the GPS receiver caused by the pressure change and high-degree vacuum conditions are analyzed in terms of tracking and navigation capabilities through the signal-to-noise ratio and navigation error.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.32 no.4
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• pp.341-348
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• 2019

This paper reports the microstructure and electrochemical properties of Si-Al-Fe ternary amorphous alloys prepared by rapid solidification as an anode for lithium secondary batteries. The microstructure was analyzed using XRD and HR-TEM with EDS mapping. In accordance with DSC analysis, annealing was performed to crystallize the active nano-Si in the amorphous alloy. Thus, nano-Si forms (~80 nm) embedded in the matrix alloy, such as $Fe_2Al_3Si_3$, $FeSi_2$, and $Fe_{0.42}Si_{2.67}$, were successfully synthesized. The electrode based on the Si-Al-Fe ternary alloy delivered an initial discharge capacity of approximately $700mAh^{g-1}$, and exhibited a high Coulombic efficiency of 99.0~99.6% from the $2^{nd}$ to $70^{th}$ cycles.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.285-289
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• 2016

In recent domestic new growth model based on the IoT it has been proposed by the industry and national authorities. As applied to these Internet-based IoT convergence center of the field is expected to be realized, including the improvement and increase of efficiency of various economic values. In this paper, using KETI ( Korea Electronics Technology Institute ) developed distribution being oneM2M standards-based platform from Mobius and Gateway Platforms & Cube, and low power, capable of long-range RF communication LoRa communication module is proposed to build the site applicable environment.

• Electronics and Telecommunications Trends
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• v.34 no.5
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• pp.1-13
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• 2019

In modern times, X-ray imaging has become a necessary tool for early diagnosis, quality control, nondestructive testing, and security screening. X-ray imaging equipment generally comprises an X-ray generator and an image sensor. Most commercially available X-ray generators employ filament-thermionic electron-based X-ray tubes, thus demonstrating typical analog behavior, such as slow response and large stray X-rays. Furthermore, digital X-ray sources, which have been studied extensively using field electron emitters manufactured from nanometer-scale materials, provide fast and accurately controlled ultra-shot X-rays. This could usher in a new era of X-ray imaging in medical diagnosis and nondestructive inspections. Specifically, digital X-ray sources, with reduced X-ray dose, can significantly improve the temporal and spatial resolution of fluoroscopy and computed tomography. Recently, digital X-ray tube technologies based on carbon nanotubes, developed by Electronics and Telecommunications Research Institute, have been transferred to several companies and commercialized for dental imaging for the first time.

• Electronics and Telecommunications Trends
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• v.34 no.5
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• pp.99-112
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• 2019

A quantum light source is an essential element for quantum information technology, including quantum communication, quantum sensor, and quantum computer. Quantum light sources including photon number state, entangled state, and squeezed state can be divided into two types according to the generation mechanism, namely single emitter and non-linear based systems. The single emitter platform contains atom/ion trap, solid-state defect/color center, two-dimensional material, and semiconductor quantum dot, which can emit deterministic photons. The non-linear based platform contains spontaneous parametric down-conversion and spontaneous four-wave mixing, which can emit probabilistic photon pairs. For each platform, we give an overview of the recent research trends of the generation, manipulation, and integration of single photon and entangled photon sources. The characteristics of quantum light sources are investigated for each platform. In addition, we briefly introduce quantum sensing, quantum communication, and quantum computing applications based on quantum light sources. We discuss the challenges and prospects of quantum light sources for quantum information technology.