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원통형조사창에서의 절리선 길이분포를 이용한 암반 내 절리직경분포 추정에 관한 연구
전기환(Kihwan Jeon),송재준(Jae-Joon Song),조영도(Young-Do Jo) 한국암반공학회 2011 터널과지하공간 Vol.21 No.5
본 연구에서는 암반 내 원통형 공동면에 나타나는 절리선 길이분포를 이용하여 암반 내에 존재하는 절리의 직경분포를 추정하기 위한 알고리듬을 제안하였다. 암반 내 절리의 직경분포를 추정하기 위해서 송재준(2005)에 의해 제시된 Joint Center Volume(JCV)의 개념이 적용되었다. 평면 조사창에 나타나는 절리선에 대한 JCV 값을 산정하는 송재준(2005)의 알고리듬을 확장하여 원통형 공동면을 조사창으로 하는 경우의 암반 내절리 직경분포 추정을 위해 전수조사 기법을 적용한 JCV 계산 알고리듬을 개발하였다. 추정된 절리 직경분포는 Monte-Carlo 시뮬레이션 기법을 이용하여 절리직경 모분포와 비교 검증하였으며 추정된 절리 직경분포가 모분포와 20% 내외의 오차 범위에서 수렴하는 것을 확인하였다. This study suggests an algorithm for estimating joint diameter distribution in rock mass from the joint trace length distribution around a circular tunnel. For estimating the joint diameter distribution the concept of Joint Center Volume (JCV) suggested by Song. (2005) was applied and the calculation method of JCV for the cylindrical window survey was developed by using the complete survey method. The estimated joint diameter distribution was verified against the original joint diameter distribution by Monte-Carlo simulation. It was observed that the estimated joint diameter distribution was converged to the original joint diameter distribution with less than 20% of error.
최소자승법을 이용한 원판형 절리의 직경분포와 체적빈도 추정에 관한 연구
송재준(Jae-Joon Song) 한국암반공학회 2005 터널과지하공간 Vol.15 No.2
이 연구에서는 최소자승법을 이용하여 절리의 직경분포를 추정하는 방법을 개발하였다. 이전에 Song and Lee가 제안한 방법에서는 현장에서 조사한 양끝내포선(contained trace)분포로부터 무한 조사창에서 정의되는 절리선(joint trace) 길이 분포를 먼저 구하고 이 후에 직경분포를 구하게 된다 그러나 새로 제안한 방법을 사용하면 중간 추정과정없이 현장에서 얻은 양끝내포선 분포로부터 바로 절리의 직경분포를 구할 수 있다 이전의 방법과 비교할 때 새로 제안된 방법은 표본의 크기가 작을 때 조금 더 높은 추정정밀도를 보이며, 직경분포를 추정하는 과정에서 절리의 기하학적 파라미터의 하나인 체적빈도(volumetric frequency)도 제공한다. 새로운 추정법의 검증을 위해 Monte Carlo 시뮬레이션을 적용하였다. An estimation technique of the joint diameter distribution using the least square method is suggested. When utilizing the technique by Song and Lee, the diameter distribution would be obtained only from the trace length distribution defined in an infinite window after the trace length distribution is estimated from the contained trace length distribution. With the new technique, however, the diameter distribution can be directly obtained from the sample histogram of the contained trace lengths. Compared with the previous technique, it shows a more accurate result for small sizes of joint samples and provides the joint geometry parameter of volumetric frequency. Verification of this new technique was completed by using Monte Carlo simulations.
EM을 첨가한 친환경 문화상품의 음이온 발생에 관한 연구
송재준 ( Jee-june Song ),이지은 ( Ji-eun Lee ),조경희 ( Kyong-hee Cho ),용민지 ( Min-ji Yong ) 한국환경기술학회 2009 한국환경기술학회지 Vol.10 No.3
When cloth contacted on skin was soaked in eco effective microorganism solution, it would make anion good for health. This could make eco-accessory that intercepts and eases the harmful matter, chemical and coating matter, during process. This study was investigated the anion variety before and after soak in effective microorganism solution. For this experiment, it prepared same size of four cloths ; cotton lycra, silk organza, silk chiffon, silk kingtuill. And it was measured that anion variety of four cloths soaked in effective microorganism before dye. And it was compared with anion variety of four cloths soaked in effective microorganism after dye. Initial anion 6 ion/cc of cotton lycra increased to 27 ion/cc in 100% effective microorganism solution. Initial anion 6 ion/cc of silk organza increased to 26 ion/cc in 100% effective microorganism solution. Initial anion 6 ion/cc of silk chiffon increased to 25 ion/cc in 100% effective microorganism solution. Initial anion 6 ion/cc of silk kingtuill increased to 24 ion/cc in 100% effective microorganism solution. On the condition of different concentration EM solution, anion was increased in high concentration EM solution. It was considered that EM solution was strong acid and it would changed the color of cloths. So it was investigated that condition of high anion was not changed cloths color. At the result of anion measurement, the variety of anion was little by passing time.
송재준 ( Jee-june Song ),홍순강 ( Sun-gang Hong ),이지은 ( Ji-eun Lee ),김지용 ( Ji-yong Kim ) 한국환경기술학회 2010 한국환경기술학회지 Vol.11 No.3
One of the important processes in environmental effects assement is to check how the result of environmental effects assement would adequately be fulfilled throughout the whole stages of a project from construction to utilization. Monitoring process plays a crucial role in environmental effects assement because it detects any significant environmental changes due to development activities while verifying how well the project is being performed based on the result of environmental effects assement. This study was investigated total water pollution load management during operation stage, generated sewage by workers and effects of sediment run off near surrounding are reviewed. According to predicted results to a factory construction, sand run off which causes by rainfall during construction is 47.61ton/day, sand run off is 648.29mg/L and the predicted result of generated sewage by workers is BOD 0.04kg/day. By result of computation for reduction of effluent load in land, final effluent load is increased by 0.935kg/day. The solution for reduction is to install diversion channel and coffering to prevent sand run off. Also it is planning to install a grit chamber for removing some sand which size is less than 0.1mm. Also it is planned to use a sewage disposal facility which was constructed for treatment human waste, and initial treatment for rainfall is planned to discharge after the treatment in sewage disposal facility. The results of EEA in the research area is suitable for environmental standards.
송재준 ( Jee-june Song ),신경진 ( Kyoung-jin Shin ) 한국환경기술학회 2010 한국환경기술학회지 Vol.11 No.4
By middle zone water environmental management plans, it is necessary that are water quality purification of river, nonpoint source pollution management, ecological river recovery and so on. On this study, examined water environmental status of southwestern middle zone. As the contents of the population, industry, water use status, environmental protection zone status, aquatic ecosystems status were investigated. As investigation results the problems through this are variability of water resource, complexity of management system, etc. At the results alternative plan would be suggested that the amount of pollution management in middle zone management, nonpoint source pollution management, ecosystem restoration projects, etc. If they wold be applied to circumstances that the impact will be positive for water environmental management.