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위성용 전개형 고안정 반사판 안테나 복합재 주반사판 설계 및 해석
김동건,구경래,김현국,송성찬,권성철,임재혁,김영배,Dong-Geon Kim,Kyung-Rae Koo,Hyun-Guk Kim,Sung-Chan Song,Seong-Cheol Kwon,Jae-Hyuk Lim,Young-Bae Kim 한국복합재료학회 2023 Composites research Vol.36 No.3
The deployable reflector antenna consists of 24 unit main reflectors, and is mounted on a launch vehicle in a folded state. This satellite reaches the operating orbit and the antenna of satellite is deployed, and performs a mission. The deployable reflector antenna has the advantage of reduce the storage volume of payload of launch vehicle, allowing large space structures to be mounted in the limited storage space of the launch vehicle. In this paper, structural analysis was performed on the main reflector constituting the deployable reflector antenna, and through this, the initial conceptual design was performed. Lightweight composite main reflector was designed by applying a carbon fiber composite and honeycomb core. The laminate pattern and shape were selected as design variables and a design that satisfies the operation conditions was derived. Then, the performance of the lightweight composite reflector antenna was analyzed by performing detailed structural analysis on modal analysis, quasi-static, thermal gradient, and dynamic behavior.
김동건(Dong-Keon Kim),권순홍(Soon-Hong Kwon),정성원(Sung-Won Chung),박종민(Jong-Min Park),최원식(Won-Sik Choi),김종순(Jong-Soon Kim),권순구(Soon-Goo Kwon) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
The flow characteristics of unventilated dual impinging jets were experimentally investigated. Two nozzles with an aspect ratio of 20 were separated by 6 nozzle widths. The Reynolds number based on nozzle width and nozzle exit velocity was set to 5,000. A Particle Image Velocimetry (PIV) was used to measure turbulent velocity components. It was found that, when an impingement plate was installed in the converging region, there was a stagnation region in the inner area between nozzles. However, when it was installed in the combined region, both jets were merged and collided into the plate, showing single-jet characteristics. In addition, at a dual impinging jet, as the distance between a nozzle and an impingement plate decreased, the spanwise turbulent intensity at the plate increased.
김동건(Dong-Geon Kim),김일권(Il-Kwon Kim),유선영(Seon-Young Yu),권욱(Wook Kwon),길경석(Gyung-Suk Kil) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Heat radiation of LED luminaires has risen a problem when applied indoor. LEDs can save energy with higher efficacy than other light sources. However their heat radiation may increase power consumption for air-conditioning. Therefore this paper carried out a comparative analysis on the amount of heat radiation for MR16 E26 bulb and down-light which will be replaced to LED luminaires. Heat amount of LED-MR16 and LED-downlight was 48% and 87.5% lower than that of conventional lamps halogen MR16 and E26 CFL respectively. Consequently the heat amount and indoor temperature were proportional to the power consumption of luminaire. Therefore the use of LED luminaire can reduce the amount of heat radiation as well as power consumption.
김일권,김동건,길경석,조흥기,조규룡,Kim, Il-Kwon,Kim, Dong-Geon,Kil, Gyung-Suk,Cho, Heung-Gi,Cho, Kyu-Lyong 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.9
In this paper, we designed and fabricated LED navigation lights which can replace the existing ones immediately and overcome disadvantages due to use of conventional lamps. To decide the best arrangement and position of a LED module, optical systems of existing navigation lights were analyzed and refracted routes of rays were simulated. The electrical and optical characteristics of the fabricated LED navigation lights were measured and analyzed with a goniophotometer. To calculate ranges of visibility, the vertical and horizontal luminous intensity distributions were evaluated in accordance with the COLREGs (convention on the international regulation for preventing collisions at Sea). From the results, the proposed LED navigation lights showed suitable characteristics for marine environment with the power consumption reduced by 90% and the maximum luminous intensity increased by 20% compared to the existing navigation lights.
사회인 검도선수의 목표성향에 따른 운동지속수행에 관한 연구
권태원(Kwon, Tae-Woon),김동건(Kim, Dong-Gun) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.6
In this study, adults in the fencing tournament participants continued to perform the exercise, which continued to perform this exercise with the goal orientation affects are intended to identify how. The subject of this study 16 - July 2011 held on 17 adults at the 24th National Congress who participated in kendo men’s and women’s 212 players were enrolled. Research methods and procedures as above, through the present study were the following conclusions. Groups according to the results of stepwise regression analysis, the goal orientation of the magnetic orientation of the graduates of the sub-GPCR fun if the player’s effort (β =.- 254), the graduate / graduate in each of the player yuneunggam (β =-. 305), (β =-. 434) affected by age, according to the results of stepwise regression analysis, a subset of the target GPCR propensity for self-orientation of 50 players each for a fun effort (β =.- 540), yuneunggam (β =.- 427), the 20 players in the yuneunggam (β =-. 433) affected, according to the stepwise regression analysis vocational orientation of the target GPCR his inclination to subordinate officers / clerical work fun for players (β =.- 376), the self-employed players yuneunggam respectively (β =-. 352), tension (β =-. 303) appeared to influence.
‘상두군 대목’과 ‘산소지시 대목’의 변이 양상과 의미
권기성(Kwon Ki-sung),김동건(Kim Dong-keon) 우리문학회 2014 우리文學硏究 Vol.0 No.43
이 연구의 목적은 〈심청전〉의 곽씨 부인 장례대목 중 ‘상두군이 발이 붙는 대목’과 ‘노승의 산소지시 대목’이 첨가된 이본을 대상으로 하여, 이들 대목의 선후 수용관계를 살펴보고 각 대목의 변이 양상이 지니는 의미를 이해하고자 하는 것이다. 특히 이 두 대목이 나타나는 이본에는 모두 ‘장승상 부인 대목’이 삽입되어 있어 ‘장승상 부인 대목’의 발전양태와 관련하여 이들 두 대목의 변이양상을 추정해 볼 수 있다. ‘상두군 대목’과 ‘산소지시 대목’은 18개의 이본에서 확인되며, 대목의 배치는 이본별로 동일하나, 대목의 유무는 차이가 있다. ‘상두군 대목’이 나타나는 본은 8개본으로 형태상 3가지 유형을, ‘산소지시 대목’이 나타나는 본은 15개본으로 형태상 4가지의 구성을 지닌다. 이 두 대목의 변이양상은 ‘상두군 대목’의 수용에서 ‘산소지시 대목’의 수용으로, 그리고 두 대목을 모두 수용한 이본군의 등장에서 다시 특정 대목의 탈락 등으로 다양하게 변화하고 있음을 살펴볼 수 있다. 이는 애초에 두 대목이 따로따로 수용되었다가 어느 시점에서 이를 확대시킨 광대나 특정 계층에 의해 통합되었고 이후 판소리나 필사본의 상황에 따라 다시 선별적으로 수용되었을 가능성을 의미하는 것이다. 그런데 ‘장승상 부인 대목’이 계속해서 확장되어 갔던 반면, 대부분의 이본에서 이들 두 대목은 탈락되어 있다. 이는 이들 대목이 서사의 진행상 불필요했다는 것을 방증하는 것으로, 요컨대 ‘심청의 효’라는 작품의 주제의식을 고취시키는 데 큰 도움이 되지 못했다는 것이다. 그러나 일제 강점기 때 인기 있었던 레코드 판에 두 대목이 모두 삽입되어 있는 것으로 보아 19세기 후반까지는 오늘날의 이본들과는 다르게 어느 정도 그 명맥을 유지해 온 것으로 보인다. This study deals with different versions adding the ‘passage of Sangdugun’s foot attachment’ and ‘passage of the old monk’s Sansojisi’ among the parts of Madam Gwak’s funeral in 〈Simcheongjeon〉 and examine the order of acceptance of those passages in order to understand the meanings that the aspects of change in each of the passages have. In particular, the different versions having these two passages all include ‘the part of Madam Jangseungsang’, so we can figure out the aspects of change in those two passages in relation with the aspects of development of ‘the passage of Madam Jangseungsang’. The ‘Sangdugun passage’ and ‘Sansojisi passage’ are found in 18 different versions, and the arrangement of the passages are the same in those different versions, but the presence of those passages differs. And the ‘Sangdugun passage’ is found in eight versions, and the types can be classified into three. And the ‘Sansojisi passage’ is found in 15 versions, and it has four types of organizations in terms of their forms. About the aspects of change in these two passages, it changed in many different ways from the acceptance of the ‘Sangdugun passage’ to that of the ‘Sansojisi passage’ and also from the appearance of the different versions group accepting the two passages both to the omission of a certain passage again. Originally, the two passages were accepted separately, and at a certain point, clowns or a certain class either extended or integrated them, and later, they may have been accepted selectively again according to the situations of pansori or manuscripts. Although ‘the passage of Madam Jangseungsang’ was extended continually, these two passages were omitted in most of the different versions. This circumstantially proves that those passages were unnecessary in terms of the development of its narrative. And it was not very helpful in raising the consciousness of the work’s theme, ‘Simcheong’s filial piety’. With the fact that the two passages were both inserted in the record version that was popular during the Japanese colonial era, however, we can see that it maintained its existence to some extent until the late 19th century unlike different versions that have been transmitted till now.