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Investigation of edge taping method applied to vacuum insulation panels
Choi, Bongsu,Song, Tae-Ho Elsevier 2017 Energy and buildings Vol.134 No.-
<P><B>Abstract</B></P> <P>Vacuum insulation panel (VIP), commonly composed of an evacuated filler material and a vacuum envelope, is drawing attention for the outstanding insulation performance compared with conventional insulators. As an associated problem, however, its effective thermal conductivity may be increased, since additional heat is transferred through the envelope edge; this is called edge conduction. It is significantly large if the envelope includes an Al-foil layer. In this paper, the edge conduction for VIPs with Al-foil envelope is investigated from experiments, numerical results, and theoretical analyses.</P> <P>‘Edge taping method’ is investigated as a means to reduce the edge conduction, where insulation stripes are attached along the edges of the envelope. Numerical analyses and experiments are performed to verify this method and an analytical solution is proposed. The results show excellent agreements among themselves and prove that the edge conduction can be substantially reduced by the edge taping. Also, dimensional analysis is performed and the ‘easy-to-use’ analytical solution is expressed in a dimensionless form. Use of the proposed relation helps one determine a quantitative sizing of physical parameters in the edge taping method.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Edge conduction of VIP with Al-foil envelope is investigated. </LI> <LI> Edge taping method is proposed to reduce the edge conduction. </LI> <LI> Edge taping method is validated with the numerical results and experiments. </LI> <LI> Approximate solution of effective thermal conductivity for edge-taped VIP is obtained. </LI> </UL> </P>
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한국형발사체 추진기관시스템 시험설비 연료공급시스템 설계
최봉수(Bongsu Choi),김용욱(Yongwook Kim),이장환(Janghwan Lee),조기주(Kiejoo Cho) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
추진기관 시스템 시험설비 (PSTC)는 한국형발사체 (KSLV-II)의 추진기관 시스템을 검증하기 위해 고안되었다. 구성요소로는 유공압 시스템, 테스트 스탠드 시스템, 제어계측 시스템, 후류안전시스템이 있으며 본 논문에서는 유공압 시스템의 연료공급 시스템에 대해서 소개하고 있다. 연료 공급 시스템은 연료의 저장 및 냉각, 공급 배관의 냉각 및 퍼지, 연료의 충전 및 회수를 수행하는 시스템을 의미하며 한국형발사체 1/2/3단의 연료충전 조건을 고려하여 설계하였다. Propulsion system test complex (PSTC) is designed to verify propulsion system of KSLV-II. It is composed of hydraulic and pneumatic system, test stand system, control/measurement system, and flame deflector and safety system. In this study, kerosene filling system of hydraulic and pneumatic system is introduced. It performs store and chilling of kerosene, chilling and purging of filling line, and filling and retrieval of the kerosene. The kerosene supply requirements of 1, 2 and 3 stages of KSLV-II are considered in design process
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최봉수(Bongsu Choi),전원태(Weon-Tai Jeon),이용환(Yong-Hwan Lee),김민태(Min-Tae Kim),엄순표(Sun-Pyo Eum),오계정(Gae-Jung Oh),조현숙(Hyun-Suk Cho),박태선(Tae-Seon Park),성기영(Ki-Yeong Seong) 韓國雜草學會 2011 Weed&Turfgrass Science Vol.31 No.4
녹비작물의 이용은 화학비료를 대체할 뿐만 아니라 토양의 지속성을 유지시킬 수 있는 방법 중의 하나이다. 본 연구에서는 동계기간 지속적으로 헤어리베치와 보리를 재배하고 이를 토양환원한 뒤 벼를 재배하는 윤작체계가 벼의 수량과 논 잡초 발생에 미치는 영향을 평가하였다. 손제초구에서 벼의 수량은 관행구와 비교하여 헤어리베치 재배구 및 헤어리베치와 보리 혼파구에서 각각 93%와 90%의 수량을 확보하였으나 보리 재배구는 79%수준이었다. 무제초구에서는 헤어리베치 재배구에서 관행구와 비슷한 수준이었고 헤어리베치와 보리 혼파구는 83%, 보리재배구는 54%수준으로 수량이 감소하였다. 벼의 최고분얼기의 논에서 발생한 잡초는 관행구에서는 물달개비가 포함된 6종이었고, 헤어리베치 재배구와 보리 재배구는 각 5종, 헤어리베치와 보리 혼파구는 2종(여뀌바늘, 돌피)이 발생하였다. 이들 잡초의 건물중은 헤어리베치 재배구와 보리 재배구에서 관행구보다 감소하였고 헤어리베치와 보리 혼파구에서 증가하였다. 헤어리베치 재배구에서는 방동사니과 잡초의 발생이 현저히 감소되었다. 피의 발생량은 관행구를 비롯하여 모든 처리구에서 다른 잡초보다 현저히 낮았으나 피가 차지하는 건물중 비율은 현저히 증가하였다. The use of green manure crop is one of the methods for alternative of chemical fertilizer as well as maintain of soil sustainability, therefore we evaluated the effect of green manure crops on rice growth and weed occurrence in rice-green manure crop double cropping system. The treatments consisted of incorporation of hairy vetch, barley or combined hairy vetch and barley without any agrochemical or fertilizer. In hand weeding, rice yield in hairy vetch only or hairy vetch and barley incorporated fields was attained by 90% and 93% of the conventional practice, respectively, while the value in barley incorporated fields was just 79%. Although the rice yields were lower than the hand weed control, similar trends in non-weed control were observed among all treatments. At maximum tillering stage, occurred weeds in hairy vetch, barley or hairy vetch and barley incorporated fields were five, five and two species, respectively, while those in conventional practice were six species. Also, the dry weight of weeds in hairy vetch and barley incorporated fields was decreased by 33% and 53% compared to it of conventional practice, while the value in hairy vetch and barley incorporated field was increased by 34%. Among all treatments, although occurrence density of Echinochloa crus-galli was lower than another weed species, the dry weight of it significantly increased. These results suggested that although continuous incorporation of proper amount of legume green manure crops was possible to productivity insurance of crop, but to attain it was essential to the effective management of weeds.
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최봉수 ( Choi Bongsu ) 한국행정사학회 2018 韓國行政史學誌 Vol.43 No.-
본 연구는 고려의 광역적 지방통치제도를 초기부터 정리하여 5도 양계의 성립과정을 설명하고 5도 양계의 운영과 변천을 밝히는데 목적을 두었다. 고려 초기에는 전운사와 금유·조장을 두어 지방의 조세와 공부를 관할했다. 성종 2년에 금유·조장을 폐지하고 12목을 설치함으로써 중앙집권화 정책들을 추진할 수 있었다. 성종 14년에는 12목제를 10도와 12절도사로 개편하여 보다 중앙집권적인 지방 군정통치체제를 구축하였다. 10도제는 전운사, 절도사 및 자사가 기능을 분담하는 3원적 지방장관체제로 운영되었다. 또한 목종 8년에는 자사와 관찰사, 단련사 등을 폐지함으로써 절도사와 전운사에게 권한을 집중시켜 지방통치의 능률성을 확보하고자 하였다. 현종 3년의 75도 개혁은 지방의 12주 절도사체제를 75주읍의 주현군체제로 전환하는 군사적 목표를지녔다. 절도사의 권력을 안무사와 안찰사에게 분산시켜 75주읍의 군·민정과 수령전최를 분담하도록 하였다. 현종 9년의 개혁은 75도 주현군체제의 문제점을 개선하기 위해 실시되었다. 변경지역에 주현군을 집중적으로 배치하고 군 관리체계를 경기이남 5도와 달리하여 양계라 하였다. 경기이남 5도에는 주·군·현의 주속관계를 명확히 하여 주현군의 관리를 효율적으로 할 수 있도록 하는 한편 안무사를 폐지하고 8목을 두어 병민서정을 관리하도록 했다. 현종 9년의 개혁을 통하여 군정적으로 5도 양계의 체제를 갖추고 양광·경상·전라·서해·교주 등 명칭을 정했다. 그러나 민정적으로 전라와 서해도를 제외한 지역은 계수관들의 숫자와 도명이 일치하지 못했고 지역세력의 반발로 인해 5도의 명칭이 전반적으로 활용되지 못했으며 예종 이후에 변형된 형태로 나타나고 지방의 세력변동에 따라 변천하게 되었다. The purpose of this study is to explain the process of the establishment of 5-Do Yanggye and it’s changes by analyzing the regional governing system from the early age of Koryeo dynasty. In the early years of Koryeo, the Jeonunsa, the Geumyu and the Jojang were the local administrators for the taxes and tributes. However the king Seongjong had abolished the Geumyu and the Jojang in the 2<sup>nd</sup> year of the king and established the 12-Moks for the purpose of centralization. The success of his centralization policies resulted in the establishment of the 10-Do 12-Jeoldosa system in the 14<sup>th</sup> year of the king. The 10-Do 12-Jeoldosa was the centralized local military administrative system which governed by three local minister who were the Jeonunsa, the Jasa and the Jeoldosa. This local governing system was similar to that of Song dynasty in China. The three dimension system was reformed in the 8<sup>th</sup> year of king Mokjong and the powers concentrated to the two local minister - the Jeonunsa and the Jeoldosa. The 75-Do reformation in the 3<sup>rd</sup>. year of king Hyeonjong was to change the 12 troups army of the Jeoldosa for the 75 town guards in the whole country. The Jeoldosa was abolished in this reform and his authorities were divided into Anchalsa and Anmusa. So the three members of local minsters- the Jeonusnsa, the Anmusa and the Anchalsa were charge the responsibilities of local military and civil adminstration. The reorganization of local institution in the 9<sup>th</sup> year of the king Hyeonjong was to solve the problems which derived from the 75-Do system. The town guard force were allocated intensively on the border areas so called Yanggye to strengthen the national defence and established the commanding system which was deferent from that of 5-Dos which were the southern areas of the capital Gyeongy. The relationships between the central and subordinated towns in 5-Dos were also clearly established to effectively manage the town guards under the supervision of three local ministers who were 8-Moks, Anchalsa and Jeonunsa. In this reform, the 7 Anmusas were substituted by 8 Moks and later, in the 20<sup>th</sup> year of king, the Jeonunsa was also abolished. The 5-Do Yanggye ― Yanggwang, Gyeongsang, Jeolla, Seohae, Gyoju, Donggye and Bukgye were established in the 9<sup>th</sup> year of Hyeonjong and mainly used for the areas of military administration, inspection and expelling the local officers. Except the Jeolla and Seohae, however, the names of 5-Do which used the two main central towns were different with the numbers of local minsters ― Gyesugwans who charged the responsibility of local civil administration and it made the local powerful families resist to use the names. This was the main reason why the three names of 5-Do did not found in the Koryeosa. These names were appeared in the changed forms after the age of king Yejong and varied according to the changes of the powers of local nobilities.
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