• Journal of the Korea Academia-Industrial cooperation Society
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• 제13권8호
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• pp.3726-3734
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• 2012

This study evaluated the behavior of pollutants based on the seasonal change by selecting the branch river's factors that influence the outflow of pollutants in Soyang lake basin. The analysis method was the factor analysis that classified the factors of the drainage area influencing the outflow of pollutants, and evaluated selected representative factors. As a result of the study, SS and T-P factors should be classified as similar factors to the storm water runoff, and the improvement of water must be strived through managing source of pollution at the time of no rain. Second, as the result of the influence from the factors, spring and winter seasons usually exert 36% influence and summer and fall exert over 90% significant influence that the improvement of water through managing source of water seems possible. At last, the prediction about delivery pollution load considering the outflow characteristic of pollutants at the drainage area based on seasonal change by regarding selected factors as independent variables is possible.

• Journal of Korea Water Resources Association
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• 제52권6호
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• pp.441-449
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• 2019

Drought is a longer lasting and more extensive disaster than other natural disasters, resulting in significant socioeconomic damage. Even though drought events have same severity, their damage vary from region to region because of spatial, technical, economic, and social circumstances. In this study, drought vulnerability was assessed considering socioeconomic factors. Preliminary factors were identified from the case study for Chungcheong province, and evaluative factors were selected by applying the principal component analysis. The entropy method was applied to determine the weights of evaluative factors. As a result, in Chungcheong province, farm population, number of recipient of basic living, water fare gap indicator, area of industrial complex, amount of underground water usage, amount of water available per capita, water supply ratio, financial soundness for water resources, amount of domestic water usage, amount of agricultural water usage and agricultural land area were chosen as the evaluative factors. Among them, the factors associated with agriculture had larger weights. The overall assessment of vulnerability indicated that Cheongju, Dangjin and Seosan were the most vulnerable to drought.

• Journal of Korean Society of Forest Science
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• 제100권4호
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• pp.672-680
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• 2011

The purpose of this study has been carried to develop a criterion for the selection of evaluation factors on Forest Carbon Cycle Community(F.C.C.C) based on the result of survey of 96 participants who were operation managers on mountain eco village(31), relevant experts(33), and officers of local government(32). For analysis of the results of survey, DHP(Delphi Hierarchy Process) method was used which is a combination of Delphi method and AHP(Analytic Hierarchy Process) method. The key factors on selection of a suitable area to launch F.C.C.C. project of Korea Forest Service was selected under three hierarchical classes. Class 1 comprises 3 indices(Physical resource index, Human resource index, Vision index), and Class 2 which contains 10 indices (Existing resource, Surroundings resource, Forest biomass resource, Humanities Social quality, Local resident participation, Leader's ability, External support, Planning of operation, Capability of operation, and Effect of operation). Class 3 is sub-level class of class which possess 38 indices. From the results of analysis, Consistency Index(C.I) of each index in the 3 classes was used as evaluation factor. In Class 1, index 'human resources' showed highest Consistency Index(0.454). In Class 2, index 'forest biomass resources' was the highest Consistency Index(0.376) in 'physical resources' of Class 1, index 'leader's ability' was the highest Consistency Index(0.326) in 'human resources' of Class 1, and index 'planning of operation' was the highest Consistency Index(0.346) in 'vision' of Class 1. In Class 3, relative importance of 38 index including 'Joint ownership land security(C.I.-0.266)' was evaluated. Based on the result of this study, a criterion for the selection of evaluation factors for F.C.C.C was developed and the evaluation criterion is expected to be use to select of a suitable area to launch F.C.C.C. project since 2011.

• Journal of the Korean Society of Radiology
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• 제12권4호
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• pp.459-466
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• 2018

Risk of radiation worker and radiation workplace are being mainly assessed by exposure dose. But, the radiation used in radiation workplace and the work environment are different. Because the nondestructive work environment varies depending on the work subject, the existence and nonexistence of shielding board, and so on. So, we need to consider the various factors in effective radiation protection aspect. We conducted a survey of radiation workers with over two years' experience in NDT workplace and heared the thoughts of experts. As a result, radiation source, exposure dose, current status of workplace management, workers with personel dosimetry problem and status of periodic regulatory inspection were chosen as main factors of radiation risk index model. Also, we primarily set weighting factors in order of importance based on questionnaires. Finally, we determined weighting factor for details of main factors through the professional advice. Therefore, we will be able to develop the radiation risk index model for assessing the risk of nondestructive test workplace based on main factors that are selected through this study.

• Journal of Wetlands Research
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• 제21권2호
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• pp.163-172
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• 2019

The USLE P factor is a factor that varies depending on how croplands are managed and cultivated. Previous studies tend to overestimate the amount of soil loss because the factor was estimated from the slope of the watershed rather than the estimate of each cultivated land. In addition, the accuracy of estimating the soil loss is decreasing due to the fact that the factor is calculated without considering various conditions of cultivated land defined by Wishmeier and Smith. In order to overcome these problems, the Ministry of Environment (MOE) has proposed to establish the topsoil notification and calculate the P factor according to the cultivation methods (e.g., tillage system, support practice). However, it is required to apply the conditions proposed in the United States to domestic circumstances as it is causing uncertainties. Thus, this study selected the watersheds where soil loss was serious (Haean, Jaun, Banbyeoncheon), measured the actual slopes and slope lengths, and examined the crop, tillage systems, and support practice for each cultivated land. The P factors were recalculated considering the actual conditions of cultivated land and compared to the factors proposed by the previous studies (MOE). As the result of the study, the P factors calculated based on the previous studies were 0.8 ~ 1.0 in three watersheds. On the other hand, it is confirmed that there is a significant difference between the factors notified by MOE and estimated by reflecting the topography and cultivation methods in this study. Therefore, it is considered that the research for developing the cultivation conditions to calculate the P factor suitable for the domestic environment should be continuously carried out.

• Journal of the Korean Society of Marine Environment & Safety
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• 제24권6호
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• pp.764-772
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• 2018

It is necessary to explore the possibility of alternative habitats and research the characteristics of basic habitats due to seeding, culturing and harvesting of blood clams (Tegillarca granosa) in tidal flats. Currently, dependence on naturally occurring spat is much higher than in other species, which may lead to a reduction in biological resources. In this study, we selected a total of 5 sites (Changgi, Hopo in Cheonsu Bay and Dangsan, Sachang, Wangsan in Garolim Bay) and examined habitat suitability factors for suitable site selection. Also, we considered the relationship of habitat suitability factors (Environment: water content, organic content; survival: mud content, mean size; growth: chlorophyll a). As a result, Wangsan had the highest score of the main habitat of blood clams (Habitat suitability score, Wangsan: 87; Dangsan: 86; Sachang: 81; Hopo: 78; and Changgi: 73). The sediment in Garolim Bay was fine-grained and the seasonal variation was lower than Cheonsu Bay. Therefore, it is considered that Garolim Bay is more suitable as a potential area and easy to utilize the space. In the future, search and selection of potential suitable sites could be considered to solve problems caused by the reduction of biological resources and the production for blood clams.

• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 2023년도 학술발표회
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• pp.147-147
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• 2023

낙동강은 4대강 사업을 통한 다기능 보 건설로 하천 환경에 변화가 일어났다. 하천 수심이 증가하고 유속이 느려지는 정체성 수역 특성을 나타내고 있다. 이는 남조류 발생에 영향을 주며 남조류가 분비하는 독성물질 또한 수생태계와 인체에 유해하며 남조류 발생에 따른 다양한 원인인자들이 있다. 이러한 남조류 발생 특성을 정량적으로 규명하기 위하여 최근 조류 관리에 있어 데이터 마이닝 및 머신러닝 기법을 적용한 연구가 이루어지고 있다. 머신러닝에서는 학습자료 선정에 따라 예측 결과가 다르게 나타나며 이는 발생원인이 복잡한 남조류에 있어 중요한 부분이라 볼 수 있다. 낙동강의 다기능보는 하나의 유체에 직렬형으로 8개의 다기능보가 위치하고 있다. 8개의 보로 나누어져있는 하천은 각 구간별로 보의 수리학적 특성, 유역 특성이 다르다. 따라서 구간별 조류 발생 특성이 다르게 나타난다. 본 연구에서는 구간별 특성을 분류하고 조류 발생에 영향을 미치는 주요 인자들을 분석하고자 한다. 조류 발생에 있어 낙동강 8개 보 지점에 대하여 복잡한 남조류 발생 주요 영향인자 분석과 더불어 머신러닝 기법을 이용하여 영향인자에 따른 남조류 발생조건을 정량적으로 분석하였다. 수질 인자뿐만이 아닌 수리학적 인자를 고려하여 수리학적 체적시간이 다른 각 보에서의 조류발생 특성을 분석하고자 하였다. 또한 학습인자에 따라 남조류 예측에 대한 정확도 향상이 가능한지를 확인하고 이를 통해 정체성 하천에서의 남조류 발생 특성에 대해 연구하고자 하였으며 이를 통해 낙동강 남조류 발생 및 관리에 있어 선제적 관리에 활용하고자 한다.

• KSCE Journal of Civil and Environmental Engineering Research
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• 제30권6D호
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• pp.605-613
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• 2010

In this study, Impact factors are represented and barrier height of compact car road of safety barrier is suggested through the investigation of applying problems of existed standard of general car road. For this, traffic accidents analysis is performed and based on the analysis, impact vehicle weight, impact Angle, crash velocity, and barrier height are investigated. For the decision of impact angle, analysis is carried out by comparison of RISER and 2-lines expressway accidents data. Through this, higher-impact angle is suggested. Vehicle weight data of sub-compact car, small vehicle, medium and large vehicle, SUV, small truck is surveyed and analyzed. Based on the accident accumulation rate, regression analysis of vehicle weight impact and impact velocity is performed. Also, based on the cumulative rate of vehicle weight on expressways near Seoul, barrier height of compact car road is calculated. It is noted that the results of this study will be contributed to the decision of barrier type.

• Journal of the Korean Association of Geographic Information Studies
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• 제1권2호
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• pp.14-25
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• 1998

The purpose of this paper is to select proposed waste facilities sites after consideration of relative importance of siting factors. From the literature review we have established the siting factors affecting selecting waste facilities sites, and constructed hierarchy of siting factors to evaluate the relative importance of the factors using Analytical Hierarchy Process(AHP). After mail surveying of expert group, we have analyzed the relative importance of siting factors affecting waste facilities. We have constructed Geographic Information System(GIS) of raster type, based on seventeen theme maps of siting factors on waste facilities, to select the proposed waste facilities sites after consideration of the relative importance of the siting factors for Gyongsan city, in Korea. After applying linear combination method, and factor combination method to overcome the methodological limitations of land suitability analysis, we have found five proposed sites, where intersected with proposed sites obtained from the two methods. From this research we have found that 1) methodologically, using GIS for selection of proposed waste facilities sites turned out to be highly useful, 2) application of relative importance of siting factors and two methods of land suitability analysis in selection of proposed waste facilities sites are pertinent enough to provide valid and reliable results, and 3) the research methods and approach employed in this research will be highly useful in site selection of other major facilities.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2011년도 정기 학술발표대회
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• pp.46-46
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• 2011

가뭄은 인간이 극복하기 힘든 자연재해로 사회, 경제, 환경등에 막대한 피해를 가져온다. 따라서, 이를 극복하기 위해 지속적인 가뭄 모니터링이 필요한데, 현재 가뭄의 모니터링은 대부분 기상학적 인자를 고려한 가뭄지수의 심도에 의해 이루어지고 있다. 본 연구는 이러한 가뭄모니터링 방법을 좀 더 현실적으로 개선시키고자 가뭄심도를 근거로 가뭄발생 빈도와 가뭄발생 시 취약인자의 선정을 통해 가뭄위험평가기법을 제안하였다. 이를 위해 가뭄의 위험정도를 정량화하고 가뭄발생으로 인해 발생 가능한 피해 요소들을 정량화하여 가뭄재해지수(Drought Hazard Index)와 가뭄취약성지수(Drought vulnerability Index)를 산정하고, 두 지수의 결합으로 가뭄위험지수(Drought Risk Index)를 산정하였다. 가뭄재해지수는 가뭄지수 EDI를 바탕으로 가뭄심도에 따른 발생확률을 근거로 산정하였으며, 가뭄취약성지수는 가뭄 발생 시 취약한 인자를 선정하여 이를 지수화 하였다. 가뭄위험평가의 적용을 위해 2001년의 경상도 지역의 가뭄을 평가하였다. 가뭄위험지수를 바탕으로 경상도 지역의 가뭄의 위험정도를 평가할 수 있는 가뭄위험지도를 작성한 결과 경상북도 지역이 경상남도 지역보다 가뭄발생빈도와 취약정도가 컸음을 확인할 수 있었으며, 경상도 내륙지방을 중심으로 가뭄의 위험이 높음을 확인할 수 있었다.