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필 댐의 특성을 고려한 농업용 저수지 정밀안전진단체계 개선 연구
이창범,정남수,박승기,전상옥,Lee, Chang Beom,Jung, Nam Su,Park, Seong Ki,Jeon, Sang Ok 한국농공학회 2016 한국농공학회논문집 Vol.58 No.4
In 2008, 17, 596 dams and reservoirs are scattered across South Korea, and 17, 505 of them (99.5 %) are used for agriculture and 99.3 % are fill dam types. This study aimed to review literature related to the precise safety diagnosis system for agricultural reservoirs established by Korea Rural Community Corporation (KRCC) and analyze problems of its evaluation method. And then, it proposed ways to improve the system including a modified diagnosis system, which was applied to pilot districts in order to verify the utility. For assessment model development of agricultural reservoir, we reviewed status of precision safety inspections systems of agricultural reservoir. There are many problems such as assess agricultural reservoir not by sheet which used in fill dam but by block which used in concrete dam construction and diversion tunnel which main element in reservoir levee is treated as water intake facility. For considering diversion tunnel in reservoir levee, previous precision safety inspection systems which summed in separated phenomenon, separated element, separated site, separated facility was change to new systems which summed in site, phenomenon, element, and facility. Compared results of previous inspection system calculated total assessment index (Ec) with new system calculated total assessment index (Ec) are not show statistical difference.
효율적인 안전진단 체계 수립을 위한 농업용 저수지 유형화 연구
이창범,정남수,박승기,전상옥,Lee, Chang Beom,Jung, Nam Su,Park, Seong Ki,Jeon, Sang Ok 한국농공학회 2015 한국농공학회논문집 Vol.57 No.5
In this research, 1,032 data of precise safety inspection from 2004 to 2013 are gathered and constructed for finding effective safety inspection systems. Items are extracted from constructed data and factors for typology are decided with statistical method such as principle component analysis and cluster analysis. For factor decision, we extruded independent characteristics such as morphological and geographical characteristic, and deleted items which can be expressed by combination of independent characteristics. Four factors such as total storage, watershed ratio, levee length ratio, and spillway length ratio are extracted in this process. In cluster analysis, levee length ratio is excluded because it is not separated as cluster. Finally nine types of agricultural reservoir are extruded by total storage, watershed ratio, and spillway length ratio with frequency analysis.
Top-down 방식과 bottom-up 방식의 융합을 통한 블록공중합체 자기조립 나노구조 제어
김봉훈 ( Bong Hoon Kim ),정성준 ( Seong Jun Jeong ),신동옥 ( Dong Ok Shin ),박승학 ( Seung Hak Park ),이형민 ( Hyung Min Lee ),구종민 ( Chong Min Koo ),김상욱 ( Sang Ouk Kim ),( Guo Dong Xia ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 ELECTRONIC MATERIALS LETTERS Vol.3 No.3
The self-assembled nanostructures of block copolymers have been widely investigated because of their potential applications as templates for nanocomposites, optoelectronic devices, ultrahigh density nanodots or nanowire arrays, memory and capacitor devices, sensors, etc. Despite the advantages of block copolymer self-assembly such as parallel processing, molecular level resolution, and the capability to generate three dimensional structure, the lack of long range order of the block copolymer nanostructure have prevented the application to practical devices. Here, we review the strategy to combine top-down and bottom-up approaches as the method to obtain a block copolymer nanostructure with long range ordering. ``Graphoepitaxy`` and ``epitaxial self-assembly`` are demonstrated as the most successful strategies for well-ordered block copolymer nanostructures.