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김해동(Hae-Dong Kim),최원섭(Won-Sub Choi),김민기(Min-Ki Kim),김진형(Jin-Hyung Kim),김기덕(KiDuck Kim),김지석(Ji-Seok Kim),조동현(Dong-Hyun Cho) 한국항공우주학회 2021 韓國航空宇宙學會誌 Vol.49 No.11
최근 New Space 시대를 맞이하여 초소형위성이 위성시스템 교육용 도구에서 벗어나 민간 우주산업체, 정부 기관 및 군정찰 기관에서도 우주 비즈니스 및 실질적인 임무 수행을 위해 활용되는 추세이다. 국내에서도 대학을 중심으로 시작한 초소형위성 개발이 점차 민간 산업체를 비롯하여 다양한 주체들이 시도하고 있다. 하지만 초소형위성의 임무 성공 가능성을 높일 수 있는 우주환경시험의 수행 준비 과정과 시험 결과 그리고 그 과정에서 발생되어 질 수 있는 여러 가지 문제들에 대해 정리되고, 그 경험을 공유할 수 있는 자료를 국내에서 찾기가 쉽지 않다. 본 논문에서는 국내 최초로 개발되고 있는 6U급 초소형위성(SNIPE)의 우주환경시험의 준비부터 시험 수행 과정, 시험 결과 그리고 문제점들을 정리함으로써 나노급 초소형위성(Nanosatellite)을 개발하고자 하는 주체들이 시행착오를 줄이고 임무 성공 가능성을 높이는 데 유용한 참고자료로 활용되기를 기대한다. In the recent New Space era, Nanosatellites are being used to carry out space business and practical missions by private space companies, government agencies and military reconnaissance organizations, away from satellite system education tools. In Korea, the development of nanosatellite satellites, which started with universities at the center, is gradually being attempted by various subjects, including private industries. However, it is not easy to find relevant information to share the experience and prepare for the space environment test, test results, and the various problems that may arise in the process, which can increase the chances of mission success for nanosatellites. In this paper, we expect that the subjects who want to develop the nanosatellite(SNIPE) will be used as useful references for reducing trial and error and increasing the possibility of mission success by organizing the 6U-class space environment test, test process, test results and problems.
우포늪 부근의 장기적 토지피복도 변화와 그것이 국지기후에 미치는 영향에 관한 수치실험
김해동(Hae-Dong Kim),이순환(Soon-Hwan Lee) 한국환경과학회 2024 한국환경과학회지 Vol.33 No.3
We investigated the change in land-use alteration in a 45 km × 45 km area around the Upo wetlands in 1920s(before the Japanese occupation period), 1950s(immediately Korean independence) and the period 1970s to 2000s. These data can guide in understanding surface environmental changes in the lower Nakdong River from the early 20<SUP>th</SUP> century to the present. The influence of the long-term decreasing trend of the wetland area at the Upo Swamp was evaluated using a high-resolution local circulation model. The cooling effect of the wetlands on surface air during the daytime in summer(e.g, early August) was approximately 2℃ greater in the 1920s than in the 2000s, which is attributed to wider water areas in the 1920s. Additionally, long-term changes in land use have caused changes in the convergence zone of local circulation wind.
이해동(Hae-Dong Lee),최용제(Yong-Je Choi),김호원(Ho-Won Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
In this paper, we designed RSA hardware module by VHDL. This crypto module is aiming for low-power sensor node deployed at Sensor Network. For RSA moduler exponetiation, we use Montgomery reduction method and use 32bit basic multiplier/32bit basic adder.
소환시 발생되는 아황산 가스가 흰쥐 혈청 중의 효소 활성도 및 지질 함량에 미치는 영향
김해동,김병학,하헌,조수열,윤수홍,Kim, Hae-Dong,Kim, Byung-Hak,Ha, Hun,Cho, Soo-Yeul,Yoon, Soo-Hong 환경독성보건학회 1997 환경독성보건학회지 Vol.12 No.3
Recently, incidences of pulmonary-related diseases are increasing and natural ecosystem is destroyed year by year owing to air pollutions by industrial noxious gases such as sulfur dioxide and carbon dioxide, etc. Sulfur dioxide produced by oxidation of sulfur compounds is water soluble and causes several kinds of pulmonary diseases, damaging on plants and animals. This study was undertaken to investigate effects of acute exposure of rats to sulfur dioxide using biochemical parameters. The sAST (aspartate transaminase) activity was not significantly affected but sALT (alanine transaminase), sLDH (lactate dehydrogenase) and sALP (alkaline phosphatase) activities were significantly increased by acute sulfur dioxide gas exposure. Also sulfur dioxide gas treatment significantly diminished serum cholinesterase activity. The total lipid, triglyceride, total-, HDL- and LDL-cholesterol contents were significantly increased by sulfur dioxide gas exposures. But the body and liver weight were generally diminished in comparison with control group. Our results' showed increased enzyme activities and lipid contents, but body and liver weight were all diminished by sulfur dioxide gas treatment.