Fe-Ni-Si-B계 비정질합금의 자기적 성질

홍연기,김종오 忠南大學校 産業技術硏究所 1989 산업기술연구논문집 Vol.4 No.2

Amorphous (Fe Ni) Si B (x=0, 0.2, 0.4, 0.6, 0.8, 1, y=6, 8, 10, 12) alloys were prepared by a single roll quenching method. Both composition and temperature dependence of saturation magnetization were studied by vibrating sample magnetometer(VSM). Electrical resistivity was measured by four probe method and the power loss was calculated which is related change of frequency by A.C B-H loop tracer. Domain patterns were observed by Bitter method. 1. The preparation of amorphous alloys with all composition was possible, and after heat treatment crystallization occurred, resulting in Fe₃B and Ni₃B. 2. The saturation magnetization was increased with B content and the Curie temperature was about 750°K. 3. Electrical resistivity in amorphous alloys was twice in crystalline alloys and the crystallization temperature was increased with Si content. 4. The power loss of amorphous (Fe Ni) Si B alloys which is dependent on frequency was decreased with decreasing Si content and Ni content. 5. By heat treatment, the fingerprint type domain was gradually diminished and the decrease in power loss was also observed.

「靑山別曲」해석에 문제있다

김종오 세계평화교수협의회 1988 廣場 Vol.177 No.-

하천환경의 정량적 평가 및 활용에 관한 연구

김종오,김옥선,김선혜 한국습지학회 2004 한국습지학회지 Vol.6 No.3

본 연구의 목적은 하천환경의 정량적 평가기법을 통해 하천 관리 전략의 틀을 개발하는데 있다. 연구 대상지는 경남 진주시를 관통하여 남강으로 유입되는 6개의 지방 하천이다. 하천환경평가는 세 가지의 현장 조사를 통해 수행되었다. 첫째, 대상 하천의 제방선으로부터 좌우 50m, 길이 500m 간격을 단위구간으로 하여 20개의 평가항목에 대해서 하천 자연도를 조사하여 5등급으로 평가하였다. 둘째, 수질 및 유량을 8회 조사하여 5등급으로 평가하였다. 셋째, 해당 하천유역의 토지이용도를 주거지 비율을 따라 5등급으로 평가하였다. 이상의 하천환경의 세 가지 부문인자인 자연도, 수질 그리고 토지이용도를 통합하여 다시 5등급으로 분류하여 최종적인 하천환경을 평가하였으며 그 결과에 따라 각 하천별 관리 전략을 제시하였다. 하천별 적용 결과를 살펴보면, 판문천과 가좌천은 적극적인 환경복원이 필요한 Ⅳ등급으로 평가되었고, 나불천과 용아천은 부분적 복원이 필요한 Ⅱ등급으로 평가되었으며, 영천강과 독산천은 현 상태 유지가 바람직한 Ⅰ등급으로 평가되었다. 이상의 대상 하천별 환경 평가는 향후 하천관리 계획수립이나 하천 복원을 위해 중요한 참고자료가 될 것으로 기대된다. The purpose of this study was to develop the environmental management strategy of streams based on the quantified evaluation method of the stream environment. The six streams in Jinju city flowing into the Nam-river were selected for the case study. The stream environment evaluation was performed considering the following three independent field surveys. First, the stream naturalnesses considering 20 evaluation elements were investigated for each unit section of the streams having the length of 500m and the width of 100m, and then were evaluated into 5 grades. Second, water qualities of the streams were evaluated into 5 grades based on the results of eight times water quality survey. Third, the landuse patterns in the stream basins were evaluated into 5 grades according to the residential area ratio. Finally, the stream environments were classified into 5 grades by integrating the above three subfactors - stream naturalness, water quality, and residential landuse. According to the evaluation results of stream nvironments, the three environmental management strategies of streams were suggested. As the results of the case study, Panmun stream and Ghajwa stream were evaluated to the forth grade that need active environmental restoration, and Nabul stream and Yonga stream were evaluated to the second grade that need partial environmental restoration while Youngchun river and Dogsan stream were evaluated to the first grade showing the desirable stream environmental condition. The above environmental evaluation results for each stream will be an important reference for the further stream restoration or management plan.

地下鐵驛舍 內의 落下細菌 調査 硏究

金鍾五,康柱元 동남보건대학 2001 論文集-東南保健大學 Vol.19 No.2

As the traffic congestion is getting accelerated, it is recommended that they use and develop public transportation. In Seoul, underground Is used as a crucial transportation. In addition to this, the time we stay around underground keeps increasing. In this view. the environmental sanitation of underground and stations must be considered as a basis. The following are the results of this study: 1. The average amount of dropping bacteria investigated through 4 lines of underground in Seoul is shown as 124.8CFU/plate. The minimum is 57CFU/plate at Dorimchon station and the maximum is 256.3CFU/plate at Heahwa station. 2. They can hardly find the different in the amount of dropping bacteria among a platform, a toilet and a ticket gate where we extract the samples. 3. In comparison with the amount of dropping bacteria which is extracted in Japan for 5 minutes, 75CFU/plate, ours are shown 1.6 times as much as theirs. This kind of amount might keep increasing as the population using underground and the time they spend around underground are getting more. As a result we are urged to consider a counter plan. 4. Through we have not investigated the amount of dropping bacteria by time, we need variety of investigations that are divided by time as well as season in order to estimate ecological circumstances accurately. Moreover we need to watch the movement of dropping bacteria.

구리 및 크롬슬러지를 함유한 고화체의 동적용출 특성

김종오 경상대학교 환경보전연구소 1994 環境保全硏究所報 Vol.2 No.1

In this study, laboratory experiments were conducted with synthetic heavy metal sludges containing copper and chromium. It was attempted to investigate dynamic leaching characteristics of the solidified materials during 40 days. Considering three different disposal option such as landfill, reuse in construction, and ocean disposal for the solidified wastes, three different leachants, namely, acidic water, distilled water, and seawater, were used in the leaching tests. During dynamic leaching periods, almost matrix constituents of solidified materials leached out under acidic water indicating that leaching mechanisms were controlled by matrix decompositions rather than by bulk diffusions. Under distilled water and seawater, dynamic leaching of solidified heavy metal sludges seemed to be controlled by bulk diffusions. Leachate alkalinity under seawater decreased less than leachant alkalinity, which would be caused due to carbonate influx into solidified matrices.

해운대 해수욕장 성범죄의 특성과 시사점

김종오 국가위기관리학회 2013 국가위기관리학회 학술대회 Vol.2013 No.2

異分散下의 Calibration에 관한 回歸方法

김혜중,김종오 동국대학교 자연과학연구소 1986 자연과학연구 논문집 Vol.6 No.-

調査變數를 Calibration 하기 위해 설정한 回歸方程式의 오차항들이 異分散을 가질경우, 加重回歸分析에 의해 이것을 Calibration 하는 방법으로는 Classical approach 와 Inverse approach 의 두가지 方法論이 있다. 이 두 方法論을 Monte Carlo simulation 으로부터 얻은 자료들을 가지고 비교한 결과, 平均自乘誤差를 비교 기준으로 볼때, Inverse approach 가 Classical approach 보다 優越하다는 것이 밝혀졌다. The Classical and Inverse weighted least squares methods of linear calibration are compared by Monte Carlo methods. The Inverse approach is found to be superior to the classical approach from a mean squared error point of view.

지진 및 침수 대비 상·하수 관망/관로 기능 유지 관점에서의 취약점 분석기법 개발

김종오,변역근,최현훈,정호영,Kim, Jong-O,Byeon, Yeok-Geun,Choe, Hyeon-Hun,Jeong, Ho-Yeong 한국수자원학회 2021 물과 미래(한국수자원학회지) Vol.54 No.10

지리산 왕등재 습지의 지표수 수질 및 토양 환경조사

김종오,이창호,지인주 경상대학교 환경보전연구소 2001 環境保全硏究所報 Vol.9 No.-

The this study was performed to survey the characteristics of surface water and soil in Wangdungjae wetland located at Chiri-Mountain. The results of survey summarized as follows; 1. The physico-chemical characteristics of surface water such as pH, temperature, and DO were in the range of 6.02-6.39, 13.5-24.3℃, and 3.81-9.97 ㎎/L, respectively. Also, the organic concentration such as BOD and COD were in the range of 1.3-1.61 ㎎/L and 3.55-0.07 ㎎/L, respectively. The water quality of five different sampling sites showed the similar characteristics. 2. The physico-chemical characteristics of soil showed the different properties with the soil sampling depth. According to increasing sampling depth, cation exchange capacity (CEC) and electric conductivity (EC) increased but pH decreased.

蘇聯體制 接近立場에 관한 小考

金鐘嗚 韓國共産圈硏究協議會 1988 共産圈硏究論叢 Vol.1 No.-