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Rhee, Sungsu,Ling, Marisa Mei,Park, Junboum Korean Society of Soil and Groundwater Environment 2013 지하수토양환경 Vol.18 No.4
In the beginning of $20^{th}$ century, the coal mining industry had an important role in Japan at which two-thirds of the coal product came from the Kitakyushu-Chikuho District (KCD). As a consequence of mining activities, land-use condition in this district showed notable changes. This paper presented a study of land-use changes in coal mining area by characterizing land-use pattern transition over the last 100 years. In order to carry out the rigorous analysis of land-use, a series of land-use maps over the last 100 years was developed using geographic information systems (GIS). The historic topographic map and another available old data were used to investigate the long-term changes of land-use associated with past mining within the GIS platform. The results showed that the utilization of a series of developed land-use maps successfully indicated the difference of land-use pattern in the KCD before and after the peak of mining activities. The general findings from land-use analysis described that forest and farm lands were lost and turned into abandoned sites in the last 100 years.
Monitoring of LNAPLs in the Subsurface Organic Soils Using Partitioning Tracer Method
Sherin Khan Momand,Sungsu Rhee,Junboum Park 한국토목섬유학회 2008 한국토목섬유학회 학술발표회 Vol.2008 No.4
The risk assessments and remediation of the sites, potentially contaminated with LNAPLs, are constrained by their incomplete characterization. The usual method of partitioning tracer test neglects the effect of sorption to the soil organic matter. The purpose of this paper is to demonstrate the effect of sorption of tracers to the soil organic matter on the quantification of LNAPLs (Light None Aqueous Phase Liquids) from experimental results. Diesel is used as NAPLs in this laboratory scale column investigation. Method of moment is used for estimating the saturation of LNAPLs in the columns. The experimental results are from sorption isotherm tests with selected soils and partitioning tracer experiment with columns packed with selected soils and their mixtures. However, there were no contaminants added, breakthrough curves from Columns, packed with mixture of Jumonjin sand and organic matter, showed separation of tracers. Columns were then contaminated to residual saturation with diesel and breakthrough curves were obtained and the results were compared which shows that sorption of tracers to soil organic matter lead to an overestimation of the quantification of NAPLs. The amount of organic matter in the soil was determined by incineration. The sorption of tracers proportionally increased with the increase of the organic matter contents of the soil.
적응적 방법에 의한 하이퍼큐브 네트워크 결함 진단 알고리즘
최혜연,김선신,강성수,최길호,이충세 충북대학교 컴퓨터정보통신 연구소 2003 컴퓨터정보통신연구 Vol.11 No.2
시스템 레벨의 대부분의 진단 알고리즘은 PMC 모델을 바탕으로 결함의 개수가 t개를 초과하지 않는다는 t-진단가능 시스템의 특성을 이용하여 결함을 진단한다. 그러나, 다중처리 시스템 상에서 큰 규모의 결함 집합을 고려할 때에 여러 가지 제약이 따른다. 또한 병렬처리 시스템의 규모가 커짐에 따라 시스템 내에서 발생되는 결함의 빈도가 높아지게 된다. 진단 알고리즘에서 가정하는 결함의 개수 t는 병렬처리 시스템 안에 있는 노드의 수에 비해 상당히 작은 개수이며, 결함의 개수가 t개를 초과할 경우의 연구는 거의 이루어지지 않았다. Somani와 Peleg은 k개의 부정확한 진단을 용인함으로써 결함의 개수가 t개를 초과할 경우에도 시스템을 진단하는 t/k-dignosable 시스템을 제안하였다. 이 논문에서는 Somani 등이 제안한 것처럼 k=1개의 부정확한 진단을 용인하는 경우에 하이퍼큐브를 진단하는 알고리즘을 제안한다. 이 논문에서 제안한 알고리즘은 더 많은 결함을 진단하면서도 기존의 알고리즘보다 효율이 거의 떨어지지 않는다는 사실을 분석을 통하여 확인할 수 있었다. System level diagnosis algorithms are based on the PMC model and use the properties of t-diagnosable system where the maximum number of the faults does not exceed t. Diagnostic algorithms have limit when dealing with large fault sets in multiprocessor systems. Somani and Peleg proposed t/k-diagnosable system to system diagnose by allowing upper bounded few number of units to be diagnosed incorrectly, which can diagnosis more faults than t-diagnosable system. In this paper, we propose hypercube diagnosis algorithm using t/k-diagnosable system. When the number of faults exceeds t, we allow a fault(k=1) to be diagnosed incorrectly, Based on this idea, we find that the performance of the proposed algorithm is nearly as efficient as any previously known strategies and detect more faults.
Influence of Age on Effort Required to Complete Spirometry in Children and Adolescents
Lee Eun,Song Jun Hyuk,Chung Eun Hee,Jung Sungsu,Rhee Eun Hee,Suh Dong In,양현종 대한천식알레르기학회 2022 Allergy, Asthma & Immunology Research Vol.14 No.6
Although effort required to complete spirometry is known to differ by age, no studies have addressed this issue. The present study aimed to identify the difference in the effort required to complete spirometry by age in children and adolescents. Data from 707 children (mean age, 10.2 years; range, 4–25 years) from 6 medical centers were analyzed. In addition to demographics, we obtained information on the time required for as well as the number of demonstrations and spirometry demonstrations and trials from the patients’ electronic medical records. A total of 398 (56.3%) male participants were included, and 300 (42.4%) participants had no prior experience receiving spirometry. The mean time required for spirometry demonstration was 2.7 minutes (standard deviation [SD], 2.1 minutes), whereas that for spirometry trial was 5.9 minutes (SD, 5.1 minutes). The total mean time required for spirometry was 8.6 minutes (SD, 6.5 minutes). Significant negative associations were observed between age and effort required to complete spirometry with respect to the time and number of demonstrations and trials. The results of the present study suggest that age may affect the degree of effort required to complete spirometry, with a pattern of increasing effort with decreasing age. This finding provides important evidence for the establishment of health care policies especially regarding lung diseases that can benefit from spirometry.