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김우중,권중현,이관희 진주산업대학교 1997 論文集 Vol.36 No.-
The stress analysis concerned with axisymmetrically loaded axisymmetrical structures, such as pressure vessels, rockets, cooling towers, roof domes and storage tanks, has been researched with a lot of difficulties. The elements of revolution using the finite element method enable these problems to be analyzed with a high degree of confidence. This research focuses on the efficient conduct of the thin axisymmetric shells subject to axisymmetrical load which was idealized by a series of conical frustum-shaped elements that was suggested by Grafton and Strome and later extended by Percy. In this study, this research mentioned above is extended to the conical shell whose end is fixed to simplify the methodology of the analysis of any kinds of axisymmetrically loaded axisymmetrical shell structures. To demonstrate the validity and simplicity, the results of the proposed method were compared with the numerical solution SAP90 and got agreeable results.
Fly Ash를 사용한 수중 불분리 콘크리트의 배합 방법에 따른 콘크리트의 성질에 관한 연구
김우중,권중현 진주산업대학교 1997 論文集 Vol.36 No.-
This study investigates the effect of mixing method on the antiwashout underwater concrete containing Fly Ash. On the experimental condition, the unit weight of used materials was fixed and a new the mixing method different from the traditional method in its prolonged mixing time and the order of material inputs was used. In this experiment, the mixing time was prolonged to 10 minutes, and the order of material input was changed to make the admixture homogeneous. That method of mixing improved the fluidty, the unit weight and compressive strength of fresh concrete.
Fly Ash를 사용한 수중불분리 콘크리트의 유동성에 관한 연구
권중현(Joong-Hyen Kwon),배기성(Ki-Seong Bae) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.1
This paper is to investigate the Fluidity of Antiwashout Underwater Concrete containing Fly Ash. The results of study are concluded as follows : the increase in Slump Flow value did not happen in the plain concrete which was replaced cement by Fly Ash ; however, the maximum value could reach in the replacement of 30% of Fly Ash by weight of cement in the Fly Ash replaced concrete. On the condition of Fly Ash-Antiwashout Underwater Concrete in expecting 50㎝ of the Slump Flow, it was necessary that the usage amount of Superplasticizer be around 1% of unit Binder, and 1.5% in 60㎝ of the Slump Flow, respectively.
플라이애시를 혼입한 수중불분리성 콘크리트의 내 황산염에 관한 실험적 연구
권중현(Joong-Hyen Kwon),김봉익(Bong-Ik Kim) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.3
This paper describes the effects of fly ash replacement on the sulfate resistance of antiwashout underwater concrete which was replaced cement by fly ash from 0% to 50%. and the experimental works were performed on sulfate acceleration test of 5%Na₂SO₄ solution to find out the variance of length and weight if specimens. The experimental result shows that the length if specimens of antiwashout underwater concrete age at 180day was highly increased compare with normal concrete by acceleration test. but the mixture which was replaced 50% of fly ash shows reduction if the expansion, weight various, compare with normal concrete specimen. accordingly by using fly ash as admixture in antiwashout underwater concrete in sea environment, it will makes more durable for the attacks of sulfate by sea water.
입자성 유기물의 안정동위원소비를 이용한 팔당호 수계내의 유기물 기원 연구
김희중 ( Hee-joong Kim ),김민섭 ( Min-seob Kim ),윤숙희 ( Suk-hee Yoon ),임보라 ( Bo-ra Lim ),김금희 ( Kum-hee Kim ),정현미 ( Hyen-mi Chung ),최종우 ( Jong-woo Choi ) 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-
Organic carbon and nitrogen stable isotope ratios of particulate organic matter (POM) were determined at 7 stations (6 stations in Han river and Paldang dam outflow station) from May to October 2013, in order to understand the origin of POM at the Han river. δ<sup>13</sup>C values of POM in 7 stations were no significant changes season, but δ<sup>15</sup>N values were enriched in around Kyeongan stream (K). POC, PN and Chl-a concentration showed a similar seasonal pattern in Kyeongan stream, with an apparent decrease from July to August. POC and PN concentration has a higher correlation with Chl-a concentration in Kyeongan stream (K). δ<sup>13</sup>C and δ<sup>15</sup>N values of POM has a lighter value during lower Chl-a concentration period, compared to other seasons. Our results revealed that Kyeongan stream (K) seemed to be influenced by substantial amount of organic manure or fertilizer input in 2013, compared to the previous year (2012). These results suggest that the analysis of stable isotope ratios is a simple but useful tool for the identification of organic matter origin in aquatic environments.