선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
문제 정의
- All the pollution sources should be controlled and purified, but more focus on controlling the most serious potential pollution sources in the region can contribute to prevention of water pollution through efficient allocation of resource and time. Thus the aim of the study is to select a variety of factors influencing the water quality of ARA waterway and to develop the assessment items and the index to be able to evaluate systematically and objectively the water environment of a stream. The assessment items are selected by the brainstorming of the related experts, the Delphi technique and analytic hierarchy program (AHP) method are used for the selection of the factors and the development of the index.
제안 방법
- For reflecting unbiased opinion, We divide the experts into two groups, namely technology experts and economics experts, pick the remaining score except the highest and the lowest score in each group, and calculate the total score. In the event that the respondents of the survey related to Delphi technique and AHP have little knowledge and understanding of the current state of ARA waterway, objective outcome of survey can not be obtained, thus researchers selected the survey participants after careful consideration, and made a prior explanation for the survey in order to meet Inconsistency Rate required in decision- making. Referentially, AHP is not a probability-based parametric statistical analysis methodology but a non-parametric methodology to calculate the weight.
- In the first and second stage of Delphi analysis process, we asked a series of intensive question to the experts over the fundamentally important problems influencing the water environment of ARA waterway, assessed or revised the expert's personal views after gathering and summarizing what the respondents answer, and so sought a solution to the water environment of the waterway with casting open-ended questions, confirmed and ranked the variety of cause factors.
- 2]. In the third stage, all the experts reached the unified opinion, the reliability analysis and the validity analysis were carried out.
- The assessment items are selected through their consultation by 40 experts in various field of civil engineering, environment, policy, and administration in order to reach a final conclusion for the improvement of water quality of the ARA waterway[Table 1]. For reflecting unbiased opinion, We divide the experts into two groups, namely technology experts and economics experts, pick the remaining score except the highest and the lowest score in each group, and calculate the total score.
- The purpose of the study is to examine that what kind of methodology for the survey and the analysis should be used in order to improve the water environment of streams including the Gyeongin ARA waterway, and to recognize the necessity for a systematic and scientific approach, and to suggest that in empirical side, the measure for concrete assessment method and technique should be considered. Additionally, given that the pursuit of a solution to an assessment method and technique should be required, the study was attempted in the hope of plenty of further studies following the study.
- The researchers invented an assessment index and a score sheet for ARA waterway through analysing the weight and the transformed score based on the relative priority order between assessment items on the basis of the outcome of Delphi technique and AHP analysis[Table 8]. As shown in [Table 8], the assessment items such as ‘sludge deposit due to Gyulhweon weir and bridge', ‘polluted water from Gulpo-cheon’, ‘influent water from other stream’, ‘loss of self purification capacity’, ‘problem of regulation area’, ‘livestock wastewater and wastewater treatment plant’, ‘Lack of wastewater treatment plant’ are put in the high rank of the priority order.
- The study conducted the reliability analysis by utilizing Cronbach‘s α for the purpose of verifying the reliability.
- The study selected the various factor affecting the water environment of the Gyeongin ARA waterway, and used Delphi technique and AHP in order to develop the assessment items and the index for systematic and objective evaluation in terms of the control of water quality.
- The study picks 40 persons as a sample. The survey tool consists of two topics, Delphi technique is designed to evaluate the items on main cause of, serious effect on, adverse effect on creation of water environment of ARA waterway on Likert-type scale of 5 points, meanwhile AHP technique is designed for the comparison method on the scale of 9 points.
- From now on, the precautionary policy for the control of water quality should be set up with a view to subdivide the decision-making process for the improvement of water quality of the Gyeongin ARA waterway and then prepare for a logical basis and an objectivity to evaluate the priority order of water quality improvement project. with regard to applicability in real sites, the discussion should be carried on steadily on detailed methodology and technique to be able to measure respective assessment item.
대상 데이터
- Generally, more than 30 samples is the minimum number of samples to be able to make normal distribution on the basis of central limit theorem. The study picks 40 persons as a sample. The survey tool consists of two topics, Delphi technique is designed to evaluate the items on main cause of, serious effect on, adverse effect on creation of water environment of ARA waterway on Likert-type scale of 5 points, meanwhile AHP technique is designed for the comparison method on the scale of 9 points.
- Yang and Kim(2013)[7] used the Delphi method to develop a vulnerability index for drought based on Nakdong watershed. Twelve indicators were selected based on three groups, ie hydrological, meteorological, and humanistic groups. Studies related to river water quality, Yeo(2011)[8] has developed the method for choosing alternative of water resources project and deciding investment priority by making use of Analytic Hierarchy Program, AHP.
이론/모형
- Content Validity and Validity are used to verify the validity of Delphi technique. Content Validity is analysed based on Content Validity Ratio, CVR suggested by Lawshe(1975)[15].
- Thus the aim of the study is to select a variety of factors influencing the water quality of ARA waterway and to develop the assessment items and the index to be able to evaluate systematically and objectively the water environment of a stream. The assessment items are selected by the brainstorming of the related experts, the Delphi technique and analytic hierarchy program (AHP) method are used for the selection of the factors and the development of the index.
성능/효과
- As for three tiers in the evaluation items, loss of self purification capacity at the internal factor in the physical·environmental factors, sludge deposit due to Gyulhweon weir and bridge at the external factor is the highest in terms of importance, livestock wastewater and wastewater treatment plant at the facility factor in the administrative factors, problem of regulation area at the policy and regulation factor, polluted water from Gulpo-cheon at the aquatic ecology and point pollution sources factor in the natural/fixed environmental factors, influent water from other stream at the living environment and non-point pollution sources factor, freighter and passenger boat at the financial factor in the cultural and social factors, lack of wastewater treatment plant at the external factor is the highest in terms of importance.
- [Table 7] shows the priority order at three tier and the result of the importance. As the result, in the assessment items of three tiers, polluted water from Gulpo-cheon at aquatic ecology and point pollution sources in natural/fixed factors stands at 0.507, pesticide and livestock wastewater flowed in from other stream at living environment and non-point pollution sources indicates at 0.360, freighter and passenger boat at financial factor in social and cultural factors is 0.327, lack of wastewater treatment plant at external factor records at 0.457, the highest in importance. Loss of self purification capacity at internal factor in physical and environmental factors is 0.
- Kang and Lee(2006)[6] surveyed 127 experts and used ahp analysis to analyze the importance of WRSI componen. the result of survey represented that efficiency and equity of water use and water quality for river restoration are mahor issues in enhancing the water resources sustainability. Yang and Kim(2013)[7] used the Delphi method to develop a vulnerability index for drought based on Nakdong watershed.
후속연구
- The purpose of the study is to examine that what kind of methodology for the survey and the analysis should be used in order to improve the water environment of streams including the Gyeongin ARA waterway, and to recognize the necessity for a systematic and scientific approach, and to suggest that in empirical side, the measure for concrete assessment method and technique should be considered. Additionally, given that the pursuit of a solution to an assessment method and technique should be required, the study was attempted in the hope of plenty of further studies following the study. From now on, the precautionary policy for the control of water quality should be set up with a view to subdivide the decision-making process for the improvement of water quality of the Gyeongin ARA waterway and then prepare for a logical basis and an objectivity to evaluate the priority order of water quality improvement project.
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