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인공위성 궤도별 지구중력 포텐셜과 태양복사압에 의한 섭동력 영향 분석
김윤중,배종희,여정민,김유단 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11
인공위성의 정밀궤도결정을 위해서 섭동력에 대한 정확한 동역학 모델링이 필요하다. 본 논문에서는 인공위성에 작용하는 다양한 섭동력 중에서 가장 영향력이 큰 지구중력 포텐셜에 의한 섭동력과 비중력 섭동력 중 태양복사압에 의한 섭동력에 대해 연구하였다. 수치 시뮬레이션에서는 중력모델 JGM3 을 이용한 지구중력 포텐셜에 의한 섭동력과 TOPEX 위성모델을 이용한 태양복사압에 의한 섭동력의 동역학 모델을 검증하였다. 다양한 궤도에서의 섭동력 영향을 분석하기 위해 저궤도, 중궤도, 정지궤도 위성의 궤도정보를 이용하여 수치 시뮬레이션을 수행하고, 그 결과를 ECI 좌표계에서 위치오차로 나타내어 섭동력의 영향을 비교 분석하였다. For the precise orbit determination, the accurate dynamic model of the perturbations is required. In this paper, the geopotential perturbation and solar radiation pressure perturbations are considered; geopotential of the Earth is the largest force acting on the satellite and the solar radiation pressure perturbation is one of the non-gravitational perturbations. Numerical simulations are performed to verify the dynamic model of these perturbations using JGM3 gravity model and TOPEX model. To show the influence of perturbations on the satellite with respect to the satellite orbits, LEO (Low Earth Orbit), MEO (Mid Earth Orbit,), and GEO (Geostationary Earth Orbit) are considered, and the position error in ECI frame are shown.
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서울 공공임대주택 입주에 따른 소득효과 분석 - 임대료 편익을 중심으로 -
김윤중,이훈 한국부동산원 2022 부동산분석 Vol.8 No.2
This study attempts to estimate different characteristics of rent benefits generated by the low-income households living in public rental housing in Seoul by income level and supply type, and suggest implications of findings. For this purpose, rent benefits of people who resides in public housing are estimated by the market price approach using Panel Survey of Seoul Housing& Communities Corporation and Korea Housing Survey of Ministry of Land, Infrastructure and Transport both released in 2020. According to the findings, rent benefits provided by public rental housing are significant in relation to long-term public Jeonse (SHift), apartment complexes and, geographically, the southeast area where the market rents are relatively high. With regard toincome, benefits are noticeable especially in low-income households, which confirms that public rental housing is a very effective tool for redistribution of income. In sum, the findings show that reduction in housing expenses and subsequent increase in disposable income, which can be happened by households moving into public housing, is expected to induce changes in people’s non-rent spendings and bringing in great value and life satisfaction. 본 연구는 서울지역 내 저소득계층이 공공임대주택에 거주하면서 발생하는 임대료 편익이 지역에 따라 소득수준과 공급유형별로 발생하는 차별적인 특성을 추정하고, 그에 따르는 시사점을 제시하기 위해서 시도되었다. 이를 위해서 2020년 공개된 서울주택도시공사의 「2019년도 서울 공공임대주택 입주자 패널조사」와 국토교통부의 「2019년도 주거실태조사」를 활용하여 시장가격접근법으로 입주민의 편익을 추정하였다. 분석결과에 따르면 공공임대주택 임대료 편익은 시장의 임대료가 상대적으로 높은 장기전세, 동남권, 아파트에서 높게 발생하고 있었다. 특히 소득수준에 따른 편익의 효과는 저소득가구에서 높은 비율로 발생하여 소득재분배 수단으로써의 공공임대주택 유용성을 확인할 수 있었다. 이처럼 공공임대주택 입주에 따른 임대료 편익으로 발생하는 실질소득의 증가효과는 가구의 주거 외 소비의 변화를 유발시켜 가구의 효용을 높이고, 더불어 삶의 만족도를 높일 것으로 기대할 수 있다.
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김윤중,김기용,이헌우,전준범,이진우,윤지희 연세대학교의과대학 2022 Yonsei medical journal Vol.63 No.8
Purpose: Hereditary parkinsonism genes consist of causative genes of familial Parkinson’s disease (PD) with a locus symbol prefix(PARK genes) and hereditary atypical parkinsonian disorders that present atypical features and limited responsiveness to levodopa(non-PARK genes). Although studies have shown that hereditary parkinsonism genes are related to idiopathic PD at the phenotyp ic, gene expression, and genomic levels, no study has systematically investigated connectivity among the proteins encoded bythese genes at the protein-protein interaction (PPI) level. Materials and Methods: Topological measurements and physical interaction enrichment were performed to assess PPI networksconstructed using some or all the proteins encoded by hereditary parkinsonism genes (n=96), which were curated using the On line Mendelian Inheritance in Man database and literature. Results: Non-PARK and PARK genes were involved in common functional modules related to autophagy, mitochondrial or lyso somal organization, catecholamine metabolic process, chemical synapse transmission, response to oxidative stress, neuronalapoptosis, regulation of cellular protein catabolic process, and vesicle-mediated transport in synapse. The hereditary parkinson ism proteins formed a single large network comprising 51 nodes, 83 edges, and three PPI pairs. The probability of degree distribu tion followed a power-law scaling behavior, with a degree exponent of 1.24 and a correlation coefficient of 0.92. LRRK2 was iden tified as a hub gene with the highest degree of betweenness centrality; its physical interaction enrichment score was 1.28, whichwas highly significant. Conclusion: Both PARK and non-PARK genes show high connectivity at the PPI and biological functional levels.
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인제거용 흡착제로서 밀스케일로부터 선별된 마그네타이트 적용 연구
김윤중,엘라,최영균 대한상하수도학회 2017 상하수도학회지 Vol.31 No.4
Mill scale, an iron waste, was used to separate magnetite particles for the adsorption of phosphate from aqueous solution. Mill scale has a layered structure composed of wustite (FeO), magnetite (Fe3O4), and hematite (Fe2O3). Because magnetite shows the highest magnetic property among these iron oxides, it can be easily separated from the crushed mill scale particles. Several techniques were employed to characterize the separated particles. Mill scale-derived magnetite particles exhibited a strong uptake affinity to phosphate in a wide pH range of 3-7, with the maximum adsorptive removal of 100%, at the dosage of 1 g/L, pH 3-5. Langmuir isotherm model well described the equilibrium data, exhibiting maximum adsorption capacities for phosphate up to 4.95 and 8.79 mg/g at 298 and 308 K, respectively. From continuous operation of the packed-bed column reactor operated with different EBCT (empty bed contact time) and adsorbent particle size, the breakthrough of phosphate started after 8-22 days of operation. After regeneration of the column reactor with 0.1N NaOH solution, 95-98% of adsorbed phosphate could be detached from the column reactor.
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GPIB Controller에 의한 계측시스템의 개발에 관한 연구
김윤중 大田産業大學校 1994 한밭대학교 논문집 Vol.11 No.0101
The purpose of this paper is to develope a measurement system which is remotely controlled over the GPIB (general purpose interface bus) and directly operated on a local situtation. The system consists of a microcomputer unit, a controller unit and a measurement unit. Especially the measurement unit can be easely exchanged. therefore this system will be applicated In various situation of fields with little effort.
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