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송전철탑 부근의 대지전위 억제를 위한 이격거리 산정모델 연구
崔鍾基(Jong-kee Choi),趙?九(Hwan-gu Cho),金太榮(Tai-young Kim),李東一(Dong-il Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.2
In case of a line-to-ground fault at transmission lines, a portion of fault current will flow into the earth through the footings of the faulted tower causing electrical potential rise nearby the faulted tower footings. In this situation, any buried pipelines or structures nearby the faulted tower can be exposed to the electrical stress by earth potential rise. Although many research works has been conducted on tills phenomena, there has been no clear answer of the required separation distance between tower footings and neary buried pipeline because of its dependancy on the soil electrical charactersics of the concerned area and the faulted system. In this paper, an analytical formula to calculate the requried sepeartion distance from the faulted tower has been derived.
Uranium occurrences in coaly meta-pelites in the Jinsan area
Se jung Chi(池世定),Se hyun Kim,(金世鉉)Pyeong koo Lee(李匊,九) 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.1
本 究硏는 忠南-진산일대의 沃川系 炭質黑色粘板岩에 賦存되는 우라늄分布의 特性과, 우라늄과 組成鑛物과의 關係를 밝히기 爲하여 시도되었다. 本 究硏地域으로 부터 채취된 시료중 40개의 시료를 택하여 鑛物學的 地化學的 究硏를 實施하고 콤퓨터(IBM 370)를 利用한 統計的 相關關係를 提示하였다. 우라늄과의 正의 相關關係를 갖는 광물은 有機炭素, 赤鐵鑛, 褐鐵鑛이며, 負의 相關關係를 갖는 鑛物은 石英, 白雲母, 불투명광석광물이다. 이중 가장 높은 正의 相關關係를 갖는 것은 有機炭素이며, 우라늄의 隨伴傾向은 71.4%이다. 우라늄 부존함량과 有機炭素와의 回歸方程式은 log(U₃O₈×10⁴+1) =-1.3447+2.5599 log(Organic corbon)으로 表示되고 추정표준오차 Sy값은 0.1498에 이른다. 이는 유기탄소를 부존시킨 地質환경은 역시 우라늄 침전에도 영향을 주었음을 암시해 준다. 野外조사에 의하면 우라늄광물은 주로 黑色粘板岩中 炭質物內에 産出되고, 가끔 黑色粘板岩의 構造面上에 散點狀으로 分布하는데 후자의 경우는 우라늄 침전후의 二次的인 移動에 의한 것임을 암시해 준다. 重相關關係와 多邊數回歸分析을 通한 多元回歸方程式은 log=(U₃O₈×10⁴+1)=0.77396+0.04465 (organic carbon)+0.00574 (guartz)-0.00964 (muscovite)+0.37827(biotite)-0.02286 (clay substance)+0.01268 (other silicates)+0.1032 (barite)-0.00224 (apatite)+0.01606 (calcite)+0.08258 (hematite)-0.2406 (limonite)-0.01715 (other opagues)로 表示되고, 이에 의한 추정의 표준오차 Sy값은 0.1186이며 重相關關係의 값은 0.879이다. 따라서 多邊數回歸分析에서는 有機炭素만을 包含한 回歸方程式보다 수반경향이 5.89% 증가된다. To understand the characteristics of uranium distribution, and the correlation of the uranium content and major constituents in uraniferous black slates from the Jinsan area of Ogcheon Fold Terrain, forty representative specimens were analyzed by mineralogical and radiometric techniques. According to statistical analysis, the uranium has a positive correlation with organic carbon and limonite, but a negative relation to muscovite and other opaques. The relationship with the highest and meaningful correlation is between log uranium and organic carbon. The log uranium-organic carbon correlation coefficient is 0.845 and these two constituents have about 71.4% association. It suggests that the abundance of organic carbon controlled the uranium precipitation. The relationship of organic carbon to log uranium can be expressed by following regression equation log (U₃O₈×10⁴+1)=-1.3447+2.5599 log (organic carbon). The multiple regression equation of different major components to log uranium is log (U₃O₈×10⁴+1)=0.77396+0.04465 (organic carbon)+0.00574 (quartz)-0.00964 (muscovite)+0.37827 (biotite)-0.02286 (clay substance)+0.01268 (other silicates)+0.1032 (barite)-0.00224 (apatite)+0.01606 (calcite)+0.08258 (hematite)-0.02406 (limonite)-0.01715 (other opaques).
慶南 梁山地域에 分布하는 火山岩類의 地球化學的 特性硏究
Kim M.Y.(金炆,榮),Shin H.J.(申虹子),Lee P.K.(李匉,九),Jang Y.N.(張永南) 대한자원환경지질학회 1988 자원환경지질 Vol.21 No.2
The altered volcanic rocks, ranging from tuffaceous to andesitic rocks are widely distributed around the “caldera” area in the southeastern part of Kyeongsang province. The volcanic activity and tectonic movement are assumed to be followed by the hydrothermal activities in the area. From the mineral assemblage the type of alteration can be divided into two types ; propylitic and argillic. The average concentration of gold in hydrothermally altered rocks is somewhat lower (about 20 ppb) than that of fresh rocks (45-25 ppb), but for Ag, vice versa. During the hydrothermal process, the concentration of the trace elements Ag, Hg, Co, As, Hf, Sc, Si, Al increased, and that of Na, Rb, K, Au, Mg, Ca etc. decreased. The high anomalous contents of silver for altered rocks range from 4-7 ppm and 1-3 ppm for relatively fresh rocks.