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A BUS System Conceptual Design of Experimental Communication Satellite
Kim, Zeen-Chul,Choi, Seong-Bong,Nam, Mun-Kyung,Yang, Koon-Ho,Choi, Jae-Dong 통신위성우주산업연구회 2000 Joint Conference on Satellite Communications Vol.2000 No.-
The 2005SAT is designed to fit within the standard fairings for all compatible launch vehicles including Ariane IV, V and Atlas II/III. The 2005SAT configuration is compatible with single launch, upper or lower position of dual launch. Two offset-fed Gregorian antennae are located on the earth panel of the 2005SAT for Ku-band and Ka-band communication services. The 2005SAT bus is 3-axis stabilized platform both for transfer orbit and on-orbit operations. The attitude control logic is used quaternion using gyro data and have the compensation logic for gyro bias update by the ESA and the SSA data. The 200SSAT Electrical Power Subsystem (EPS) is designed a regulated directed-energy transfer configuration that minimize the losses between the solar array and loads while minimizing the complexity and mass of load power converters. The duel-mode propulsion scheme is selected for 2005SAT. TC&R subsystem is conceptually designed to determine specifications of processor speed, RAM and ROM size, command-telemetry format and data bus type
김진철(Kim Zeen-Chul),김한돌(Kim Han-Dol),용상순(Yong Sang-Sun) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
This paper describes satellites' three main stabilization techniques namely gravity gradient method, spin stabilization method and three-axis stabilization method. In conjunction with the methods, dynamic modelling and simulation was performed to characterize the pointing performance of each method. The trade-off between the methods was also compared in the sense of accuracy and complexity.
효율적 사회봉사명령제도를 위한 행동분석적 접근 ; 언어적 피드백과 봉사활동선택 기회제공이 사회봉사명령이수 청소년들의 지각과 무단결석에 미치는 영향에 대한 검증
오세진(Oah She Zeen),임영식(Young Sik Lim),김현주(Hyun Ju Kim),황지은(Ji Eun Hwang) 한국청소년학회 2000 청소년학연구 Vol.7 No.2
본 연구의 목적은 사회봉사명령 이수를 명령받은 청소년들의 지각 및 무단결석 행동을 감소시키기 위해 행동분석적 기법(피드백 및 봉사활동 선택 기회 제공)을 적용하여 그 효과를 검증해보는 것이었다. 연구에 포함된 피험자들은 49명(남자 48명, 여자 1명)의 사회봉사명령이수를 명령받은 범죄 청소년들이었다. 피험자들은 세 집단으로 할당되었으며, 각각의 집단은 세 가지 종류의 처치(두 종류의 처치 조건 및 통제 조건)를 받았다. 첫 번째 집단에 속한 피험자들은 자신들의 지각이나 결석 상황에 대한 언어적 피드백을 매일 받았으며, 두 번째 집단에 속한 피험자들은 당일 지각을 하지 않았을 경우와 그 전날 결석을 하지 않은 경우에 한하여 다양한 봉사활동 중에서 본인이 선호하는 봉사활동을 선택할 수 있는 기회를 제공받았다. 나머지 한 집단에 속한 피험자들은 통제집단으로서 어떠한 처치도 받지 않았다. 그리고 연구의 종속변인은 (1) 결석의 회수, (2) 지각의 회수, (3) 지각 시간의 양으로 구성되어 있었다. 연구 결과, 두 처치 집단의 지각 회수가 통제 집단의 지각 회수보다 유의미하게 적은 것으로 나타났으나, 결석 회수의 경우에 있어서는 세 집단의 평균이 유의미한 차이가 없는 것으로 나타났다. 한편, 지각 시간의 양에 있어서는 봉사활동을 선택할 수 있는 기회를 제공받는 집단이 언어적 피드백을 제공받은 집단과 통제 집단에 비해 유의미하게 적은 것으로 나타났다. 이러한 결과에 대한 해석 및 현실적 실용 가능성 등에 대한 여러 가지 논의점에 대한 토의가 이루어졌으며, 앞으로의 연구에 대한 제안 등이 이루어졌다. This study examined the effects of providing feedback and opportunity to choose community service activities for the juveniles on their tardiness and absenteeism. Subjects in this study consisted of 49 adolescents(48 males and 1 female) who convicted crimes and were given orders to conduct community service in social welfare institutes. They were randomly assigned to three groups and subjects in each group were exposed to three different kinds of treatments. The subjects in one group(feedback group) received verbal feedback concerning their attendance and punctuality every morning. The subjects in another group(choice group) were given opportunity to choose a service activity they prefer. And the subjects in the final group(control group) received no treatment. Dependent variables in the study were (1) the frequency of absence, (2) the frequency of tardiness, (3) the amount of tardiness. The results indicated that the frequencies of tardiness of feedback and choice group were significantly less than those of control group. However, the three groups did not differ with respect to the frequency of absence. With respect to the amount of tardiness, the choice group was significantly better than the other two groups. The implications and limitations of these findings were discussed and directions for future studies were also proposed.
Cysteinyl Cathepsins: Multifunctional Enzymes in Cardiovascular Disease
Xiang Li,Zexuan Liu,Zeen Cheng,Xian Wu Cheng 전남대학교 의과학연구소 2012 전남의대학술지 Vol.48 No.2
Until recently, the role of lysosomal cysteine protease cathepsins in intracellular protein degradation was believed to be mainly restricted to scavenging. However, recent studies have revealed nontraditional roles for cysteine protease cathepsins in the extracellular space during the development and progression of cardiovascular disease. Although the precise mechanisms are unknown, data from animal studies suggest that members of the cathepsin family, like other extracellular proteases, contribute to extracellular matrix protein remodeling and interstitial matrix degradation, as well as to cell signaling and cell apoptosis in heart disease. Inflammatory cytokines and hormones regulate the expression and secretion of cathepsins in cultured cardiovascular cells and macrophages. Serum levels of cathepsins L, S, and K and their endogenous inhibitor cystatin C may be useful predictive biomarkers in patients with coronary artery disease and cardiac disease. Furthermore, in vivo pharmacological intervention with a synthetic cathepsin inhibitor and cardiovascular drugs (including statins and angiotensin II type 1 receptor antagonists) has the potential for pharmacologic targeting of cathepsins in cardiovascular disease. This review focuses on cathepsin biology (structure, synthesis, processing, activation, secretion, activity regulation, and function)and the involvement of cysteinyl cathepsins in the pathogenesis of several heart and vessel diseases, especially with respect to their potential application as diagnostic and prognostic markers and drug targets to prevent inappropriate proteolysis in cardiovascular disease.