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유재환,최진혁 대한전기학회 1981 전기의 세계 Vol.30 No.8
본고의 내용은 다음과 같다. 1. Yemen 132KV 송전선공사 1.1 개요 1.2 공사계획 및 설계 2. 기초
하천 호안 콘크리트 블록이 수질 및 토양환경에 미치는 영향평가
유재환,박찬기,박윤식,신현오,이건희,이보현,차상선 한국농공학회 2023 한국농공학회논문집 Vol.65 No.1
The study is to evaluate the effect of bank protection concrete block products to streams and soils. The effect on three types of bank protection concreteblocks was evaluated.. The first type was manufactured using fly ash, and the second and third type products used fine blast furnace slag powder. Thelaboratory and field Experiments test results showed the pHs of 9 or less. Also, any heavy metals were not detected in the heavy metal leaching tests. Although some iron (Fe) was partially detected, it still met the water quality standards. In addition, heavy metal was detected from all blocks by theUS drinking water evaluation standards method. An on-site water quality and soil contamination tests were performed at the places that the blocks wereimplemented in practice. The test results showed that the application of the bank protection concrete block product did not lead to the water and soilquality degradation. Therefore, it was found that the hardened bank protection concrete block product did not elute harmful substances such as heavymetals that affect water and soil quality degradation.
유재환,권순철,이승현 한국예술교육학회 2023 예술교육연구 Vol.21 No.4
Due to the COVID-19 pandemic, people around the world have faced a reality akin to a catastrophe. As a result, the films featuring zombie viruses is no longer unfamiliar to the general public. This study explores the potential success of K-zombie films in the global market by examining the characteristics and trends of millennial zombies and K-zombie films. The research presented is intended to provide insights into the viability of K-zombie films in the worldwide film industry. The analysis begins with an investigation into the etymology and origin of zombies, followed by a review of the historical transition process of Western zombie films and the development of Korean zombie films. After analyzing the characteristics of millennial and K-zombies as popular movie themes, we examined industry trends to confirm the status of zombie films within the film industry. Our research revealed that since the release of "Train to Busan," which introduced the term K-zombie, several films have followed the characteristics and trends of millennial zombies while incorporating Korean sentiments. This research aims to offer essential guidance for upcoming K-zombie content research and film production by exploring the features and tendencies of millennial zombies and K-zombies.
유재환,Yu, Jae-Hwan 한국화재보험협회 1992 방재기술 Vol.13 No.-
As the progress in electronic industry is very rapid, various materials are used in this area and it is very difficult to find the hazard of those materials. Also expensive equipments are concentrated and flammable liguids or toxic gases are used in the procsses, the possibility of loss in the fire is very high. So it is very important to analyze various risks and take the proper measures.
우렁쉥이 껍질을 이용한 유기 액비 제조시 발효액의 특성 변화
유재환 한국유기농업학회 2014 韓國有機農業學會誌 Vol.22 No.4
폐자원인 우렁쉥이 껍질을 이용한 환경친화형 유기농 액비의 개발을 위하여 유용미생물(EM)을 이용한 우렁쉥이 껍질의 최적 발효조건과 액비의 특성을 조사한 결과 다음과 같다. EM발효 우렁쉥이 껍질 액비 제조 시 당밀의 투입량이 증가할수록 pH는 낮아지며, EC는 높아지는 것으로 나타났으며, pH는 당밀이 10% 이상 투입된 시험구에서 일정하게 유지되었다. EM발효 우렁쉥이 액비의 총 질소 함량은 발효가 경과할수록 현저히 증가하였으며, 특히 당밀이 15% 이상 투입된 시험구에서 약 220% 증가율을 나타내었다. 인의 함량은 발효 21일차에서 최고치를 나타내었으며, 칼륨의 함량은 발효가 경과할수록 증가하였다. 칼슘, 마그네슘, 나트륨의 함량 역시 발효가 경과할수록 증가하였고 당밀이 15% 이상 투입된 시험구에서 증가율이 우수한 것으로 나타났으며, 칼슘의 함량이 상대적으로 높은 것으로 나타났다. 유해성분(As, Cd, Cu, Cr, Hg, Ni, pb 및 Zn)의 함량은 시험구 모두에서 비료공정규격 기준치에 적합하였다. 우렁쉥이 껍질 액비의 유리아미노산은 총 29종이 검출되었으며 총량은 7,080.94 mg/L를 나타내었고 알라닌이 656.32 mg/L로 가장 높은 함량을 나타내었다. 이상의 결과를 미루어 볼 때 우렁쉥이 껍질을 이용한 액비화에는 당밀이 15% 이상 투입된 조건이 최적인 것으로 판단된다. This study was carried out to investigate the characteristics of the organic liquid fertilizer and find out optimum fermentation conditions of Effective Microorganisms (EM) including ascidian tunic. During the EM fermentation by adding ascidian tunic, electrical conductivity (EC) was increased, contrast to decrease the pH value, on related to the initial dosage molasses rate. Additionally, the total nitrogen quantity was shown to be increased on EM fermentation and the most effective increasing was recorded up to 220% on more than 15% molasses dosage condition. The phosphorus quantity was to be maximum rate on 21th of EM fermentation, and other contents, such to potassium, calcium, magnesium, sodium, had be shown an increasing patten during the fermentation period. After the EM fermentation, the concentration of hazardous material (Zn, As, Cd, Cu, Cr, Hg, Ni, pb) was measured below than the official criteria for commercial fertilizer. As a effective material in fermentated fertilizer, the 29 kinds free amino acids were detected and their total concentration was measured to 7080.94 mg/L.