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최고봉,우성배,송진영,강정환,김태근,김현철,송창길 한국유기농업학회 2015 韓國有機農業學會誌 Vol.23 No.3
The study researched germination of the plants and growth of Fungus according to concentration of aqueous extracts in order to provide basic data for developing natural agricultural resources by using Persicaria longiseta. The seed germination of Amaranthus spinosus was inhibited at 25% P. longiseta extract, while Agrostis stolonifera ssp. palustris was not affected at all concentrations tested. Especially, the seed germination rate and fresh weight of Trifolium incarnatum at 20% P. blumei extract were higher than those of control plot. The early growth of most receptor plant seedlings was promoted at 25% and 50% of P. blumei extracts, but the radicle growth of all receptor plants was significantly inhibited at > 25% of P. longiseta extract. The response of receptor plants to P. longiseta extract was different according to the plant species and the plant parts. The growth of plant pathogenic fungus in PDA medium showed an increasing inhibition tendency with increasing concentrations of P. longiseta extract. Especially, P. longiseta extract showed the greatest antimicrobial activity against Phytophthora infestans, Phythium graminicola, and Pythium venterpoolii. The content of total phenolic compound in P. longiseta was higher in leaves (1082.3 mg/L) but lower in roots (228.6 mg/L) and stems (207.8 mg/L), which is an allelopathic chemical. As these results are summarized, P. longiseta have competitive advantage because they release phenolic compounds with allelopathic effect and affect on germination, growth and fungi growth on underground flora compared to native plants and they have eligibility for natural herbicide and germicide.
崔高峰,李健一 경북대학교 공과대학 1982 工大硏究誌 Vol.11 No.-
In this paper, a phase shifter using switched capacitor filters, switched capacitor PLL and switched capacitor weighted summer cirucits was designed. The available phase variation of it was 90 degrees, and it can be used at audio frequency level. The total harmonic distortion of the output wave was less than 8%, and especially above the 60 Hz, it was less than 2%. Overall experimental circuits of this paper can be implemented to one-chip IC.
A prioritization method for replacement of water mains using rank aggregation
최고봉,김종우,서정철,장광호,이종민 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.10
Pipe breaks in municipal water distribution networks may cause serious damage economically and socially. Existing methods for replacement scheduling of pipes do not provide practical indicators for replacing an individual deteriorated pipe. This work formulates the selection problem as the decision of preference ordering or ranking and proposes a bipartite ranking-based approach. The suggested approach also considers loss from broken pipes in terms of the costs associated with broken water main and its repair. We use rank aggregation method to integrate multiple ranks into replacement order of water mains. The suggested framework prioritizes current pipe sections for replacement based on the aggregated ranks. Multiple ranks given by the reliability of water pipe sections are aggregated and a cost effective policy for pipe replacement is derived.
DEA기법을 활용한 국내 에너지기술개발사업 효율성 분석
최고봉,김문정,조인경,김은성,허은녕 한국혁신학회 2014 한국혁신학회지 Vol.9 No.2
에너지 분야에 대한 정부의 예산 투자가 지속적으로 확대되고, 동 분야 연구개발사업의 기획·평가 기능이 하나의 기관에 의해 통합적으로 관리됨에 따른 투자 대비 효율성의 문제가 주요 이슈로 부상하고 있다. 본 연구에서는 한국에너지기술평가원이 재출범한 2009년부터 2011년까지의 에너지기술개발사업의 학술적인 면에서의 효율성과 기술적인 면에서의 효율성을 분석하였다. 실증분석결과를 통해 에너지기술개발사업 주요 사업에 대한 투자 규모가 적절한지의 여부를 확인하고, 비효율 발생에 대한 원인을 분석하였다. Investment efficiency has become a major issue since the government R&D expenditure continuously increased in the energy sector and the planning & evaluation functions of R&D are integrated by one authority. This study analyzes the effectiveness and efficiency of the technical and the academic side of the Energy Technology Development Programs through 2009- 2011, of Korea Institute of Energy Technology Evaluation and Planning which relaunched in 2009. With the empirical analysis, determining the appropriateness of amounts for Energy Technology Development Programs and the causes for inefficiencies.