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2011 대구세계육상선수권대회 남자 높이뛰기 메달리스트들의 바이오메카닉스적 특성 분석
김의환 ( Eui Hwan Kim ),배영상 ( Young Sang Bae ),김성섭 ( Sung Sup Kim ),권문석 ( Moon Seok Kwon ),위웅량 ( Ung Ryang Wo ),김기만 ( Ki Man Kim ),이정민 ( Jeong Min Lee ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5
The purpose of this study was to perform a kinematic analysis of the high jump techniques of the three men`s medalists at the 2011 IAAF Championships in Daegu (August 27-September 4, 2011), In particular, a three-dimensional coordinates method was used to analyze the last three strides before touchdown, the touchdown techniques, and the movements after takeoff toward the bar. An analysis of the, data for the biomechanical characteristics of the world`s best high jumpers could contribute to an improvement in the performance of a national high jumper. The first conclusion of the data analysis was that the arm movements of the gold medalist, J. Williams, had a single arm form, whereas the arm movements of the other medalists were a double arm form. Second, the difference in the knee joint angles upon touchdown and toe-off was 10˚. Third, J. Williams achieved his maximum CM height after takeoff (1.26m) using the maximum flexion of his knee joint. Fourth, the foot contact duration of A. Dmitrik (0.11 s) was the shortest among the medalists, and the ratio for his transformation of horizontal velocity to vertical velocity was the greatest (75.25%) among the three. Last, the maximum CM height of T. Barry was the greatest, and his foot contact duration was the longest.
최수진,김인규,문상만,민승용,류동영,Choi, Su-Jin,Kim, In-Kyu,Moon, Sang-Man,Min, SeungYong,Rew, Dong-Young 항공우주시스템공학회 2015 항공우주시스템공학회지 Vol.9 No.4
Korea Aerospace Research Institute(here after KARI) has a plan to launch experimental lunar orbiter in 2018, and lunar orbiter and lander in 2020. There are several ways to go to the moon. Which one is direct transfer trajectory and another one is phasing loop transfer trajectory and the other one is WSB trajectory. Regardless of the transfer trajectories, LOI maneuver is the most important maneuver of all mission sequences because if this burn is failed, it is too difficult to get into the lunar orbit in the future. This paper describes first LOI target value of foreign lunar orbiters and analyzes orbital variations of experimental lunar orbiter according to various target values. By analyzing the variation of orbiter parameter after first LOI, proper orbital period for LOI target value are recommended to meet the inclination, apoapsis and periapsis altitude constraints.
석병석(Suk, Byong-suk),민승용(Min, Seung-yong),권재욱(Kwon, Jae-wook),김창균(Kim, Chang-kyoon),문상만(Moon, Sang-man),최수진(Choi, Su-jin),구철회(Koo, Cheol-hea),김인규(Kim, In-kyu),류동영(Ryu, Dong-young) 한국항공우주연구원 2015 항공우주산업기술동향 Vol.13 No.2
시험용 달 궤도선의 발사 요구조건 사전 분석 단계로 최근 외국에서 발사한 달 탐사선의 발사 요구조건을 분석하였다. 일반적으로 달 탐사선의 발사 요구조건은 달 임무 궤도를 결정하는 중요한 요소이며, 또한 지구, 달, 태양의 상대적인 운동으로 인해 임무궤도 요구조건을 만족하는 발사 가능 시간이 주기적으로 반복되는 경향이 있다. 분석 결과 설정된 발사 요구조건들로부터 달 궤도선의 주 임무가 달의 남/북극 지역의 광학 관측 임을 간접적으로 알 수 있었다. 향후 우리나라 달 궤도선 발사 요구 조건 설정에 본 논문이 도움이 되길 기대한다. In the preliminary study on launch window requirement for Korea Path-finder Lunar Orbiter(KPLO), the recent foreign lunar orbiter’s lauch window requirement was analyzed. Normally, the launch requirements depends on the mission orbit. Based on the relationship between Moon, Earth, and Sun, the launch time will be available periodically to meet requirements. In this paper, it is understood that the launch window requirements come from payload mission requirements to take picture each poles of Moon. This paper might be a practical example to derive KPLO launch requirements in the future.
Normal and Regenerated Meniscus in Rabbits : Morphological and Histological Studies
Moon, Myung-Sang,Kim, Jung-Man,Kim, In,Ok, In-Young CATHOLIC MEDICAL CENTER 1980 Bulletin of the Clinical Research Institute Vol.8 No.1
Chronological development of normal and regenerated meniscus in growing and grown adult rabbits were studied by observing the menisci grossly, histologically and histochemically at each observation time, and the following results were obtained. 1. Grossly, all regenerated menisci were less shiny and smaller than normal. It's margin was blunt in shape and completely connected with synovial membrane. 2. The normal meniscus of 5 weeks old rabbits was entirely formed of fibroblasts and fibrocytes without cartilage cells. In 12 weeks old rabbits, fibrocytes in the normal meniscus were transformed into round or oval shaped cells with lacuna and was stained by Safranin-0. 3. Cartilage cells in the regenerated meniscus were found at 12 weeks after meniscectomy in young menisccctomized rabbits, while cartilage cells were found in the regenerated meniscus at 24 weeks after meniscectomy in adult rabbits. Cartilage transformation was found in small area of regenerated meniscus, but not in entire filed as in normal meniscus of adult rabbits. 4. Average rates of cartilagenous transformation of regenerated menisci were 10.6% in young rabbits and 8.1% in adult rabbits.
Moon, Kyung-Man,Lee, Myung-Hoon,Kim, Ki-Joon,Park, Guen-Hyun,Koh, Sung-Cheol 韓國海洋大學校 附設 海洋科學技術硏究所 2002 硏究論文集 Vol.11 No.1
We have investigated the differences between the general corrosion and microbiological influenced corrosion (MIC) of a steel in terms of electrochemical behavior and surface phenomena. Corrosion potential of a steel in medium solution without SRB (Sulphate Reducing Bacteria) shifted to a low direction continuously as a function of submerging time. The potential caused by MIC with SRB shifted to a noble direction after 20days' incubation, indication the growth of SRB biofilm and the test metal specimens and a formation of corrosion product. In addition, the color of medium inoculated with SRB changed from grey to black., the color change was observed in the medium without SRB inoculation. Moreover, corrosion rated of a steel in MIC were higher than those is the absence of SRB. This is probably because SRB caused be associated with the increasing corrosion rates through increasing cathodic reaction which caused the reducing sulfate to sulphide as well as formation of an oxygen concentration cell. The pitting corrosion was also observed in the of SRB inoculated medium.
Moon, Sung-Ho,Lee, Choon-Man Elsevier 2018 International journal of mechanical sciences Vol.142 No.-
<P><B>Abstract</B></P> <P>Difficult-to-cut materials such as titanium, Inconel and nickel alloys are being increasingly used in aerospace, automobile and medical equipment. However, these materials are difficult to machine using conventional machining (CM) methods, because of their superior material properties. New machining methods are being studied and developed for these materials. One of these machining methods, Thermal assisted machining (TAM,) applies a heat source to enhance the machinability of the materials. Laser assisted milling (LAMill) is a widely used type of TAM. In the LAMill process, a laser heat source softens the materials in front of the cutting tool. However, LAMill is expensive. A plasma heat source has been widely used for welding, melting, preheating, etc., and at a cost of about one tenth that of a laser heat source. But few studies on Plasma assisted machining (PAM) have been conducted. In this study, a PAM process was developed and investigated, and its performance compared with LAMill and CM. The proper preheating temperature and depth of cut (DOC) were determined by thermal analysis. Experiments were carried out with the PAM system on AISI 1045 steel and Inconel 718 using the determined preheating temperature and DOC. It was found that PAM reduced cutting force and improved the surface quality.</P> <P><B>Highlights</B></P> <P> <UL> <LI> In this study, PAM was developed and investigated and its performance compared with LAMill and CM. </LI> <LI> The non-transferred type plasma torch used in this study and preheating experiments were performed to select the proper temperature. </LI> <LI> Thermal analysis was performed to determine the proper preheating temperature and effective depth of cut of AISI 1045 steel and Inconel 718 </LI> <LI> The machining characteristics such as the cutting forces and surface roughness were measured based on the machining conditions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Freely Deformable Liquid Metal Grids as Stretchable and Transparent Electrodes
Moon, Yu Gyeong,Koo, Jae Bon,Park, Nae-Man,Oh, Ji-Young,Na, Bock Soon,Lee, Sang Seok,Ahn, Seong-Deok,Park, Chan Woo Institute of Electrical and Electronics Engineers 2017 IEEE transactions on electron devices Vol.64 No.12
<P>A new structure of stretchable and transparent metal-grid electrodes is described, where a liquid metal alloy, eutectic gallium–indium (EGaIn) is employed as a stretchable conducting material. By a “roll-painting and lift-off” technique based on photolithography, stretchable EGaIn-grids with the linewidth of 20 <TEX>$\mu \text{m}$</TEX> and the line pitch of 400–1000 <TEX>$\mu \text{m}$</TEX> are produced, providing the transmittance of 75%–88% with the sheet resistance less than 2.3 <TEX>$\Omega $</TEX>/square. Powered by the freely deformable nature of the liquid phase conductor, the EGaIn-grid provides stable conductivity under highly stretched condition up to 40%, as well as high reliability against cyclic deformation. By combining the EGaIn-grid with a homogeneous and transparent poly(3,4-thylenedioxythiophene):poly(styrensulfonate) (PEDOT:PSS) layer in a hybrid manner, we can construct highly stretchable and uniformly conducting transparent electrodes. The hybrid PEDOT:PSS/EGaIn-grid electrodes can be utilized as electrodes for a stretchable inorganic electroluminescence device with a ZnS phosphor-elastomer composite as the emission layer, which maintains uniform and stable emission under highly and repeatedly stretched conditions.</P>