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Spin Axis Determination of Defunct GLONASS Satellites Using Photometry Observation
Jeeho Lee,Eunseo Park,Man-Soo Choi,Daniel Kucharski,Yu Yi,Jong-Uk Park 한국우주과학회 2021 Journal of Astronomy and Space Sciences Vol.38 No.1
GLONASS, a satellite navigation system developed in Russia since 1976, is defunct and orbits in an unstable attitude. The satellites in these problems are not managed and there is no precise information, which can increase the risk of collisions with other space objects. In this study, detailed attitude dynamic have to be analyzed through photometry data, which requires spin period and spin axis. The light curve data is obtained by observing through the photometer at the Graz station and the power spectrum is calculated to obtain the cycle of the satellite. The geometric relationship between observer and sun is analyzed for GLONASS-50 satellite. The box-wing model is applied to obtain the phase reflection of the satellite and obtain the Irradiation of the satellite through this information. In Light Curve and Irradiation, the spin axis is calculated for each peak points with the distance square minimum technique. The spin axis of the GLONASS-50 satellite is RA = 116°, Dec = 92°.
Spin Axis Determination of Defunct GLONASS Satellites Using Photometry Observation
Lee, Jeeho,Park, Eunseo,Choi, Man-Soo,Kucharski, Daniel,Yi, Yu,Park, Jong-Uk The Korean Space Science Society 2021 Journal of astronomy and space sciences Vol.38 No.1
GLONASS, a satellite navigation system developed in Russia since 1976, is defunct and orbits in an unstable attitude. The satellites in these problems are not managed and there is no precise information, which can increase the risk of collisions with other space objects. In this study, detailed attitude dynamic have to be analyzed through photometry data, which requires spin period and spin axis. The light curve data is obtained by observing through the photometer at the Graz station and the power spectrum is calculated to obtain the cycle of the satellite. The geometric relationship between observer and sun is analyzed for GLONASS-50 satellite. The box-wing model is applied to obtain the phase reflection of the satellite and obtain the Irradiation of the satellite through this information. In Light Curve and Irradiation, the spin axis is calculated for each peak points with the distance square minimum technique. The spin axis of the GLONASS-50 satellite is RA = 116°, Dec = 92°.
최선필(SunPill Choi),허태원(TaeWon Heo),박지호(JeeHo Park),노태균(TaeGyun Noh),정재륜(JaeRoun Jung),우정인(JungIn Woo) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this study, We proposed high efficiency wind power generator system for Induction generator used SVPWM swiching Inverter<br/> first, We propose Equivalient Circuit for Induction Generator, it's characteristics equation, and power equation of slip In addition, we suggest Pick Power Traction Slip control methods, adapted variable wind power system. We study simulation result for the proposed system and output power by slip effect. and we identify SVPWM of suitable wind power system by comparison between SPWM and SVPWM Consequently, we show that the system control result from variable wind power is suitable.
( Keonhee Lee ),( Myoungeun Choi ),( Chonghyun Won ),( Sungeun Chang ),( Miwoo Lee ),( Jeeho Choi ),( Woojin Lee ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Advances in medicine have led to the development of immunomodulatory drugs such as Anti-CTLA-4 agents and anti-PD-1/PD-L1 agents for treating patients with advanced-stage malignancies. Here, we describe a 53-year-old male patient with metastatic esophageal cancer, who was treated with nivolumab, an anti-PD-1 agent, and developed multiple subcutaneous nodules on his lower extremities which were diagnosed as septal panniculitis consistent with erythema nodosum on histopathologic examination. Interestingly, the subcutaneous lesions began to regress after biopsy and did not require any additional immunosuppressive therapy. Our case implies that dermatologic toxicities are diverse, and physicians should be vigilant regarding new side effects of immunomodulatory drugs, as recognizing such events will lead to early and proper management of patients.
( Keonhee Lee ),( Myoungeun Choi ),( Changjin Jung ),( Chonghyun Won ),( Sungeun Chang ),( Miwoo Lee ),( Jeeho Choi ),( Woojin Lee ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Background: Gordonia species were recently found to cause human infection. Most Gordonia bronchialis infections are associated with sternal wounds and foreign bodies. Case presentation: Here, we present a case of a cutaneous firm nodule caused by G. bronchialis on an immunocompetent patient’s lower extremity after receiving acupuncture. Conclusion: Our present case indicates spontaneous cutaneous infection of G. bronchialis can develop even in a healthy patient. With the popularity of complementary and alternative medicine, physicians should be aware that G. bronchialis infection can be associated with oriental medicine similar to mycobacterial infection. Recognizing the diverse clinical features of newly emerging Gordonia species will facilitate appropriate diagnosis and management of future patients.
A case of lymphomatoid contact dermatitis secondary to hair dye
( Keonhee Lee ),( Myoungeun Choi ),( Sungeun Chang ),( Miwoo Lee ),( Jeeho Choi ),( Woojin Lee ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Lymphomatoid contact dermatitis is a subset of cutaneous pseudolymphoma that clinically and histopathologically resembles both allergic contact dermatitis and cutaneous lymphoma. A variety of allergens have been described since the first description of this entity in 1976. Typically lymphomatoid contact dermatitis is related to T cell hyperplasia. We herein describe a case of cutaneous B-cell lymphoid contact dermatitis caused by hair dye. This case demonstrates that lymphomatoid contact dermatitis can present with various clinical features and emphasizes that thorough history-taking and examination is important for the diagnosis.
윤청(Cheong Youn),최훈(Hoon Choi),남택용(Taekyong Nam),류주현(Juhyun Ryu),정지호(Jeeho Jeong) 한국정보과학회 1996 정보과학회논문지 : 시스템 및 이론 Vol.23 No.10
ITU-T, RACE 및 TINA의 세 국제 표준화 기구들은 B-ISDN 서비스의 분석과 개발을 위해 객체 지향 모델링 기법을 적용하고 있다. 객체 지향 모델링 기법은 서비스를 체계적으로 분석하고 망에 도입 할 수 있도록 기반 구조를 제공한다. 세 표준화 기구들은 모두 객체 지향 모델링 방법론을 사용하지만 각 각 서비스의 다른 관점들을 강조하고 있으며 그 결과가 동일하지 않다. 본 고에서 제시된 B-ISDN 서비스 모델에 대한 비교와 통합은 B-ISDN 서비스의 완벽한 이해를 위해 필요하며 서비스의 모든 관점을 손쉽게 기술할 수 있게 하여 준다. Service modeling approaches proposed by three organizations (ITU-T, RACE, and TINA) are studied. The three organizations adopt the object-oriented modeling techniques to describe the B-ISDN services Each of them emphasizes different aspects of services and the integration of their analysis results are necessary for fun understanding of B-ISDN services. The comparison and integration provided here can be used to describe all aspects of B-ISDN services.