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나로과학위성의 자세제어용 Telecommand & Telemetry Module의 비행모델 설계 및 제작
신근수,오대수,이종주,강경인 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11
본 논문에서는 나로과학위성으로 개발된 자세제어용 Telecomand & Telemetry Module인 Attitude Control Subsystem Interface & Power Unit_Input and Output Module(AIPU_IOM)을 소개하고 비행모델(Flight Model, FM)에서의 기능 및 성능 시험 결과를 제시한다. 나로과학위성 자세제어 시스템 내의 각 전자 Unit의 상태 정보를 원격검침(Telemetry)하고 원격명령(Telecommand) 내릴 수 있는 AIPU_IOM의 설계 및 개발이 완료 되었고 동작 시험을 마쳤다. AIPU_IOM은 CPU가 없이 FPGA을 사용하여 소형화, 경량화, 표준화를 추구하고 기술 집약화를 이루었다. AIPU_IOM에 대한 기능시험과 열진공시험을 통해서 요구사항을 만족하는 결과를 확인 하였다. Flight Model Design and Implementation of Attitude Control Subsystem Interface & Power Unit_Input and Output Module(AIPU_IOM) for STSAT-2C was developed. The AIPU_IOM is Attitude Control Subsystem’s Telecommand & Telemetry module. To reduce the weight and power, AIPU_IOM was designed to 6U Standard size and all logics of AIPU_IOM are implemented in FPGA without CPU. Functional test, Thermal vacuum test and I&T(Integration and Test) was successfully performed and requirements were satisfied.
신근수,오대수,오승한,이종주,강경인,명로훈 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11
본 논문에서는 나로 과학위성에 탑재할 데이터 저장 모듈의 설계 내용에 대해서 나타내었다. 고속의 탑재체 데이터를 처리하고 대용량의 메모리를 관리하기 위해 별도의 마이크로프로세서 없이 FPGA 가 직접 처리 하도록 설계하였다. 데이터 저장 모듈에 사용된 FPGA 는 동작속도가 빠르고 게이트 수가 많은 SRAM 기반의 Xilinx FPGA 을 사용하고 있으며, 우주 환경에서의 SEU 를 극복하기 위해서 TMR 기법을 적용하고자 한다. This paper describes the design of data storage module (DSM) of Naro science satellite. Data storage module (DSM) is designed so that the FPGA can directly control the high speed data receiving from payloads and mass memory management without Microprocessor. Data storage module (DSM) used SRAM-based FPGA from XILINX having fast operating speed and large logic cells. The Triple Modular Redundancy (TMR) techniques will also be used to protect FPGA from Single Event Upset (SEU) in space.
Dual Fabry-Perot Interferometer to Improve the Color Purity of Displays
신근수,김준용,도윤선 한국광학회 2023 Current Optics and Photonics Vol.7 No.2
We propose a dual Fabry-Perot interferometer (DFPI) structure that combines two Fabry-Perot interferometers. The structure is designed to have spectral peaks in the red, green, and blue regions simultaneously, to be applicable to R, G, and B subpixels without any patterning process. The optimized structure has been fabricated on a glass substrate using a thermal evaporation technique. When the DFPI structure was attached to the quantum-dot color-conversion layer, the full width at half maximum values of the green and red spectra decreased by 47.29% and 51.07% respectively. According to CIE 1931 color space, the DFPI showed a 37.66% wider color gamut than the standard RGB color coordinate. Thus it was experimentally proven that the proposed DFPI structure improved color purity. This DFPI structure will be useful in realizing a display with high color purity.
녹차추출물이 흰쥐의 당뇨병성 이상지질혈증에 미치는 영향
신근수,박평심 한국식품조리과학회 2020 한국식품조리과학회지 Vol.36 No.2
Purpose: The purpose of this study was to evaluate the effect of green tea extract(GTE) on diabetic dyslipidemia in rats. Methods: The experimental group was divided into three groups, the none diabetic control (NC) group, the diabetes mellitus (DM) group, and the diabetes mellitus+GTE (DM+GTE) group. Diabetes mellitus was induced by high fat diet and low dose streptozotocin administration. GTE was dissolved in the drinking water at 0.2% concentration and it was orally administered for 16 weeks. The food and water intake were monitored on a daily basis, while the fasting blood glucose levels and body weight were measured weekly. After 16 weeks, the biochemical parameters were observed, and the gene expression levels of the lipid metabolism-related enzymes in the liver and soleus muscle of the rats were examined by RNA-seq method. Results: The GTE administration decreased the levels of fasting blood glucose in the diabetic groups (an average of 22%). Decreased levels of serum triglyceride (22%), total cholesterol (24%), and free fatty acid (23%) were observed in the DM+GTE group. The expression levels of hepatic acyl-CoA synthetase (Acsm2a) and the acyl-CoA synthetase family member 2 (Acsf2) genes were decreased whereas the expression levels of 5'-AMP-activated protein kinase catalytic subunit alpha-2 (Prkaa2), acyl-CoA desaturase 1 (Scd1) and acetyl-CoA carboxylase alpha (Acaca) were increased in the livers of DM+GTE group. Conclusion: These results suggest that GTE are effective in alleviating dyslipidemia caused by diabetes mellitus, and the increased expression of Prkaa2 and Acaca in liver tissues by GTE is considered to be a factor in improving diabetic dyslipidemia.
김진규,신근수,임철우,채장수 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
차세대소형위성1호는 우주관측 임무와 우주핵심기술 검증 임무 수행을 목적으로 현재 인증모델 개발이 완료된 상태이다. 위성의 버스 시스템은 소형화, 표준화, 저전력화 및 모듈화 설계를 바탕으로 개발이 되고 있다. 이러한 개념을 바탕으로 무게 및 체적에 대한 시스템의 요구조건, 발사체, 탑재체 및 본체의 요구조건을 모두 만족하도록 개념설계 및 개발이 수행되었다. 본 논문에서는 차세대소형위성1호의 태양전력 조절기의 개념설계와 개발 결과에 따른 시험 결과에 대해 고찰하고자 한다. The NEXTSat-1 was completed developed of qualification model that has two missions such as science observations and space core technology verifications. Bus system of satellite was developing based on miniaturization, standardization, lower-power consumption, modularity design. The concept of the system for on the basis of the weight and volume requirements, and launch vehicle, payload, and development verification model of the requirements was developed. This paper will be discussed the conceptual design and the development test results of solar array regulator for NEXTSat-1.
김진규,신근수,임철우,채장수 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
차세대소형위성1호는 우주핵심기술 검증 및 우주과학 관측 임무 수행을 목적으로 소형화, 표준화, 저전력화 및 모듈화 설계를 바탕으로 인증모델 개발이 완료 된 상태이다. 이러한 개념을 바탕으로 무게 및 체적에 대한 시스템의 요구조건, 발사체, 탑재체 및 본체의 요구조건을 모두 만족하도록 인증 모델개발이 수행되었다. 본 논문에서는 차세대소형위성1호의 태양전력 조절기의 인증모델 열진공시험 결과에 대해 고찰하고자 한다. The NEXTSat-1 was completed developed on miniaturization, standardization, lower-power consumption, modularity for the verification of space core technology and the research of space science. The concept of the system for on the basis of the weight and volume requirements, and launch vehicle, payload, and development verification model of the requirements was developed. This paper will be discussed the qualification model thermal vacuum test results of solar array regulator for NEXTSat-1.