http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
중동국가의 경제성장과 석유소비 및 석유수출 간의 관계에 대한 실증분석
최고봉,Zaid Yahya Abdulkader,허은녕 한국자원공학회 2016 한국자원공학회지 Vol.53 No.1
This study analyzed long-run equilibrium and causal relationship among economic growth, oil consumption, and oil exports in seven middle-east countries including the United Arab Emirates, Bahrain, Oman, Saudi Arabia, Kuwait, Iran, and Iraq. Empirical results suggest existence of three groups among seven countries. The first group, the United Arab Emirates, Bahrain, and Oman, show that their economic growth was in equilibrium with oil consumption while the second group, Saudi Arabia, Iran, and Iraq, show that their economic growth was in equilibrium with oil export, and the third group, Kuwait, shows that their economic growth was not in equilibrium with either oil consumption or oil exports. This study can give insights to further energy studies about middle-east countries. 본 연구에서는 아랍에미리트연합, 바레인, 오만, 사우디아라비아, 쿠웨이트, 이란, 이라크 등 7개의중동국가의 경제성장과 석유소비 및 석유수출에 대해서 장기균형 유무를 검정하고 인과관계를 분석하였다. 분석결과에 따라 중동국가들의 경제성장은 석유소비와 장기균형이 성립하는 국가, 석유수출과 장기균형이 성립하는국가, 석유소비와 석유수출과 장기균형을 성립하지 못하는 3개의 그룹으로 분류되었다. 경제성장과 석유소비간에 장기균형이 성립하는 국가는 아랍에미리트연합, 바레인, 오만이었으며, 경제성장과 석유소비 간에 장기균형이 성립하는 국가는 사우디아라비아, 이란, 이라크였다. 쿠웨이트의 경제성장은 석유소비와 석유수출 둘 다장기균형이 성립하지 않았다. 본 연구는 향후 에너지를 수출하는 국가들이 어떤 방식으로 경제성장을 하고 있는지에 대한 기초연구로 활용될 수 있다.
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.
Hidden Cointegration을 적용한 국제원유시장의 비대칭적 단일화에 대한 연구
최고봉 한국자원공학회 2020 한국자원공학회지 Vol.57 No.4
This study examines the asymmetric market integration of the international crude oil market by applying hidden cointegration. After decomposing the benchmark prices in the Middle East, North America, and Europe into increasing and decreasing components, cointegration tests were performed between the same components. A causality test among the components was also conducted after estimating the crouching error correction models. As a result of the analysis, the long-run equilibrium relationships among the increasing components of Dubai, WTI, and Brent prices were established. This revealed that the crude oil market tended to be integrated when there was an upward pressure on oil prices. It was found that there were bidirectional causal relationships among the increasing components. On the other hand, there were no long-run equilibrium relationships among the decreasing components. The findings of this study can be used as a basic information for the preparation of policies for coping with increasing and decreasing oil prices. 본 연구는 hidden cointegration 개념을 적용하여 국제원유시장의 비대칭적 단일화에 대한 연구를 수행했다. 중동, 북미, 유럽의 벤치마크 원유 가격을 상승성분과 하락성분으로 분해한 뒤, 각 성분에 대해 공적분 검정을 수행하였으며, 오차수정모형을 추정하여 인과관계에 대한 분석을 수행했다. 분석 결과, Dubai, WTI, Brent 가격의 상승성분 사이에 장기균형관계가 성립하여, 국제원유시장은 유가 상승압력이 존재하는 상황에서 단일화 되는 경향을 보였다. 유가의 상승성분 사이에는 양방향의 인과관계가 존재하는것으로 나타났다. 반면에 유가의 하락성분 간에는 장기균형관계가 성립하지 않아 지역화되는 경향을 보였다. 본 연구는 향후 유가대응을 위한 기초연구로 활용될 수 있다.