Pub Date : 2019-04-30DOI: 10.11001/JKSWW.2019.33.2.159
김기민, 박수완
In this paper the potential of the principal component analysis(PCA) technique for the application of detecting leaks in water pipe networks was evaluated. For this purpose the PCA was conducted to evaluate the relevance of the calculated outliers of a PCA model utilizing the recorded pipe flows and the recorded pipe leak incidents of a case study water distribution system. The PCA technique was enhanced by applying the computational algorithms developed in this study which were designed to extract a partial set of flow data from the original 24 hour flow data so that the effective outlier detection rate was maximized. The relevance of the calculated outliers of a PCA model and the recorded pipe leak incidents was analyzed. The developed algorithm may be applied in determining further leak detection field work for water distribution blocks that have more than 70% of the effective outlier detection rate. However, the analysis suggested that further development on the algorithm is needed to enhance the applicability of the PCA in detecting leaks by considering series of leak reports happening in a relatively short period.
{"title":"상수관망의 누수감지를 위한 주성분 분석의 적용 가능성에 대한 연구","authors":"김기민, 박수완","doi":"10.11001/JKSWW.2019.33.2.159","DOIUrl":"https://doi.org/10.11001/JKSWW.2019.33.2.159","url":null,"abstract":"In this paper the potential of the principal component analysis(PCA) technique for the application of detecting leaks in water pipe networks was evaluated. For this purpose the PCA was conducted to evaluate the relevance of the calculated outliers of a PCA model utilizing the recorded pipe flows and the recorded pipe leak incidents of a case study water distribution system. The PCA technique was enhanced by applying the computational algorithms developed in this study which were designed to extract a partial set of flow data from the original 24 hour flow data so that the effective outlier detection rate was maximized. The relevance of the calculated outliers of a PCA model and the recorded pipe leak incidents was analyzed. The developed algorithm may be applied in determining further leak detection field work for water distribution blocks that have more than 70% of the effective outlier detection rate. However, the analysis suggested that further development on the algorithm is needed to enhance the applicability of the PCA in detecting leaks by considering series of leak reports happening in a relatively short period.","PeriodicalId":16258,"journal":{"name":"Journal of Korean Society of Water and Wastewater","volume":"PP 1","pages":"159-167"},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85023849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-30DOI: 10.11001/jksww.2018.32.5.381
Jai-Yeop Lee, Ilho Kim
Microbubbles oxygen transfer to water was simulated based on experimental results obtained from the bubbles generation operated under varying liquid supply velocity to the multi-step orifices of the generator. It had been known that liquid supply velocity and bubble size are inversely related. In the oxygen transfer, a non-steady state was assumed and the pseudo stagnation caused the slow movement of bubbles from the bottom to the water surface. Two parameters were considered for the simulation: They represent a factor to correct the pseudo stagnation state and a scale which represented the amount of bubbles in supply versus time. The sum of absolute error determined by fitting regression to the experimental results was comparable to that of the American Society of Civil Engineers (ASCE) model, which is based on concentration differential as the driving force. Hence, considering the bubbles formation factors, the simulation process has the potential to be easily used for applications by introducing two parameters in the assumptions. Compared with the ASCE model, the simulation method reproduced the experimental results well by detailed conditions.
{"title":"비정상상태의 미세기포에 의한 산소 전달 특성 모사","authors":"Jai-Yeop Lee, Ilho Kim","doi":"10.11001/jksww.2018.32.5.381","DOIUrl":"https://doi.org/10.11001/jksww.2018.32.5.381","url":null,"abstract":"Microbubbles oxygen transfer to water was simulated based on experimental results obtained from the bubbles generation operated under varying liquid supply velocity to the multi-step orifices of the generator. It had been known that liquid supply velocity and bubble size are inversely related. In the oxygen transfer, a non-steady state was assumed and the pseudo stagnation caused the slow movement of bubbles from the bottom to the water surface. Two parameters were considered for the simulation: They represent a factor to correct the pseudo stagnation state and a scale which represented the amount of bubbles in supply versus time. The sum of absolute error determined by fitting regression to the experimental results was comparable to that of the American Society of Civil Engineers (ASCE) model, which is based on concentration differential as the driving force. Hence, considering the bubbles formation factors, the simulation process has the potential to be easily used for applications by introducing two parameters in the assumptions. Compared with the ASCE model, the simulation method reproduced the experimental results well by detailed conditions.","PeriodicalId":16258,"journal":{"name":"Journal of Korean Society of Water and Wastewater","volume":"38 1","pages":"381-388"},"PeriodicalIF":0.0,"publicationDate":"2018-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79189584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-30DOI: 10.11001/jksww.2018.32.2.153
J. Cho, K. Noh, Kyu-Hyun Park, Jung-Seok Jang, G. Nam, S. Hwang
{"title":"Effects of nutrient and inorganic carbon on single cell formation of Pediastrum duplex","authors":"J. Cho, K. Noh, Kyu-Hyun Park, Jung-Seok Jang, G. Nam, S. Hwang","doi":"10.11001/jksww.2018.32.2.153","DOIUrl":"https://doi.org/10.11001/jksww.2018.32.2.153","url":null,"abstract":"","PeriodicalId":16258,"journal":{"name":"Journal of Korean Society of Water and Wastewater","volume":"34 2 1","pages":"153-158"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83760100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-30DOI: 10.11001/JKSWW.2018.32.2.193
Yeunchul Park, Hyunju Choi
{"title":"A study on operation efficacy and security improvement through structural modification of CCTV network for bansong water purification plant","authors":"Yeunchul Park, Hyunju Choi","doi":"10.11001/JKSWW.2018.32.2.193","DOIUrl":"https://doi.org/10.11001/JKSWW.2018.32.2.193","url":null,"abstract":"","PeriodicalId":16258,"journal":{"name":"Journal of Korean Society of Water and Wastewater","volume":"11 1","pages":"193-200"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73164085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-30DOI: 10.11001/JKSWW.2018.32.2.123
Fajar Budi Laksono, S. Jung, Il-Kyu Kim
This paper provided the information related to the removal of 2,4,6-tribromophenol using in-situ and stable liquid ferrates(VI). This research’s goal was to observe the differences of oxidation power between in-situ liquid ferrate(VI) and stable liquid ferrate(VI). The in-situ liquid ferrate(VI) (FeO4 2-) has been successfully produced with the concentration 42,000 ppm (Fe) after 11 minutes of reaction time. The stable liquid ferrate(VI) was also successfully produced following the modification method by Sharma with the produced concentrations 7,000 ppm. The stable liquid ferrate(VI) was stable for 44 days and slightly decreased afterwards. This research has been carried out using 2,4,6-tribromophenol as the representative compound. Both of ferrates(VI) have the highest oxidation capability at the neutral condition. Furthermore, the stable liquid ferrate(VI) has higher oxidation power than the in-situ liquid ferrate(VI).
{"title":"Comparison of 2,4,6-tribromophenol removal using in-situ liquid ferrate(VI) and stable ferrate(VI)","authors":"Fajar Budi Laksono, S. Jung, Il-Kyu Kim","doi":"10.11001/JKSWW.2018.32.2.123","DOIUrl":"https://doi.org/10.11001/JKSWW.2018.32.2.123","url":null,"abstract":"This paper provided the information related to the removal of 2,4,6-tribromophenol using in-situ and stable liquid ferrates(VI). This research’s goal was to observe the differences of oxidation power between in-situ liquid ferrate(VI) and stable liquid ferrate(VI). The in-situ liquid ferrate(VI) (FeO4 2-) has been successfully produced with the concentration 42,000 ppm (Fe) after 11 minutes of reaction time. The stable liquid ferrate(VI) was also successfully produced following the modification method by Sharma with the produced concentrations 7,000 ppm. The stable liquid ferrate(VI) was stable for 44 days and slightly decreased afterwards. This research has been carried out using 2,4,6-tribromophenol as the representative compound. Both of ferrates(VI) have the highest oxidation capability at the neutral condition. Furthermore, the stable liquid ferrate(VI) has higher oxidation power than the in-situ liquid ferrate(VI).","PeriodicalId":16258,"journal":{"name":"Journal of Korean Society of Water and Wastewater","volume":"52 1","pages":"123-130"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85799209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-30DOI: 10.11001/jksww.2018.32.2.159
Se-Hee Park, J. Noh, J. W. Park, S. Maeng
{"title":"Biological stability in the ozone and peroxone pretreatment systems in river water","authors":"Se-Hee Park, J. Noh, J. W. Park, S. Maeng","doi":"10.11001/jksww.2018.32.2.159","DOIUrl":"https://doi.org/10.11001/jksww.2018.32.2.159","url":null,"abstract":"","PeriodicalId":16258,"journal":{"name":"Journal of Korean Society of Water and Wastewater","volume":"36 6 1","pages":"159-168"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79627202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For performance analysis of flood prevention projects, this study performed simulation (SWMM) for the five sites where the projects have been completed. The models were constructed using watershed and sewer information of the project sites and were verified using flood records in the past to improve...
{"title":"Performance analysis of flood prevention projects through flood simulation","authors":"Jungsub Shin, Seokhyun Chung, Byoungog Cho, Seon-Hong Kang, Byungman Park, Joonjae Yoon","doi":"10.11001/JKSWW.2018.32.2.169","DOIUrl":"https://doi.org/10.11001/JKSWW.2018.32.2.169","url":null,"abstract":"For performance analysis of flood prevention projects, this study performed simulation (SWMM) for the five sites where the projects have been completed. The models were constructed using watershed and sewer information of the project sites and were verified using flood records in the past to improve...","PeriodicalId":16258,"journal":{"name":"Journal of Korean Society of Water and Wastewater","volume":"145 1","pages":"169-181"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80450813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-30DOI: 10.11001/jksww.2018.32.2.077
Joon-Seok Kang, Seogyeong Park, Jeong Jun Lee, Han-Seung Kim
{"title":"Effects of membrane fouling formation by feed water quality and membrane flux in water treatment process using ceramic membrane","authors":"Joon-Seok Kang, Seogyeong Park, Jeong Jun Lee, Han-Seung Kim","doi":"10.11001/jksww.2018.32.2.077","DOIUrl":"https://doi.org/10.11001/jksww.2018.32.2.077","url":null,"abstract":"","PeriodicalId":16258,"journal":{"name":"Journal of Korean Society of Water and Wastewater","volume":"161 1","pages":"77-87"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80172864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-30DOI: 10.11001/JKSWW.2018.32.2.115
Hyun Jun Kim, Dawon Baek, Sanghyun Kim
{"title":"Optimum design of direct spring loaded pressure relief valve in water distribution system using multi-objective genetic algorithm","authors":"Hyun Jun Kim, Dawon Baek, Sanghyun Kim","doi":"10.11001/JKSWW.2018.32.2.115","DOIUrl":"https://doi.org/10.11001/JKSWW.2018.32.2.115","url":null,"abstract":"","PeriodicalId":16258,"journal":{"name":"Journal of Korean Society of Water and Wastewater","volume":"44 1","pages":"115-122"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80946431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-30DOI: 10.11001/JKSWW.2018.32.2.097
Joon-Seok Kang, Seogyeong Park, Jeong Jun Lee, Han-Seung Kim
{"title":"Application of chemically enhanced backwash coping with algal inflow in desalination pretreatment using ceramic membrane","authors":"Joon-Seok Kang, Seogyeong Park, Jeong Jun Lee, Han-Seung Kim","doi":"10.11001/JKSWW.2018.32.2.097","DOIUrl":"https://doi.org/10.11001/JKSWW.2018.32.2.097","url":null,"abstract":"","PeriodicalId":16258,"journal":{"name":"Journal of Korean Society of Water and Wastewater","volume":"62 1","pages":"97-106"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73108277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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