열화상 영상을 이용한 하수관 결함조사시스템 개발

임유성 ( Yu-seong Lim ),최윤영 ( Yun-young Choi ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.5

It takes very long to measure a crack with the use of a CCTV robot for inspecting sewer defects. That is because it is required to remove many impurities deposited in a pipe in order to put and move a CCTV robot in the sewer pipe. The sewer defect inspection system developed to save such temporal and financial costs is designed to go to the middle part of a sewer pipe and make inspection and measurement with the uses of thermal images and CCTV. For performance test and evaluation, a 600 mm concrete pipe and a 300mm PVC pipe were buried 15m, respectively. As a result, it was possible to clearly find very small cracks, which are hard to be detected with the naked eye in CCTV, through thermal imaging, and to quantitatively analyze a crack area with the crack area calculation program using the developed thermal imaging data. The performance of the sewer defect inspection system developed in this study can be classified into three types as follows. First, by checking cracks through thermal detection and CCTV and using the crack area calculation program developed in this study, it was possible to find a crack area quantitatively. Secondly, through quantitative defect inspection, it was possible to select a proper repair construction method depending on a type of defects, a size, and a position, and thereby to remarkably reduce uncertain factors which can arise under an engineer's judgment only. Finally, there was cost saving in the defect inspection. In other words, by using the pipe wall in the middle part of a sewer pipe, not in its bottom, it was possible to inspect defects regardless of impurities and thereby to considerably save the cost for removing impurities.

ESWMS 모형을 이용한 부유사분포 특성

임유성 ( Yu-seong Lim ),최윤영 ( Yun-young Choi ),김종익 ( Jong-ik Kim ),최정우 ( Jeong-woo Choi ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.3

This study is about the sediment distribution change characteristics using a two-dimensional model and selected the representative grain diameter by using the results of riverbed changes simulation using suspended sediment concentrations before and after river maintenance and river bed materials and compared and reviewed the results of simulating the resulting river bed changes. A analysis target river is Daecheon located in Gyeongju, Gyeongbuk and suspended sediment survey results showed that the suspended sediment grain diameter before and after river maintenance was found not to show a big difference, the average grain diameter before and after river maintenance 0.0606mm and 0.0591mm, respectively but it was analyzed that a significant difference occurs, the highest suspended sediment concentration before ana after river maintenance 58.6mg/l and 140.7mg/l, respectively. Also, when applying the suspended sediment concentration measured in the river bed state before river maintenance and applying suspended sediment concentration measured in the river bed state after river maintenance, various suspended sediment concentration was analyzed to generate the differences of erosion and sedimentation and based on the differences by the left bank, middle, right bank, maximum erosion 0.0028m and maximum sedimentation 0.0043m, maximum erosion 0.0013mm and maximum sedimentation 0.0027m, maximum erosion 0.0084m and maximum sedimentation 0.0062m of the difference in erosion and sedimentation were shown at the left bank, middle, right bank, respectively. Riverbed changes appear differently depending on river maintenance and the proper maintenance of the river is determined to be made when adopting an appropriate analysis method according to the riverbed shape during river maintenance and management before and after river maintenance.

하천 만곡도에 따른 흐름특성 변화

임유성 ( Yu-seong Lim ),김종익 ( Jong-ik Kim ),이병준 ( Byung Joon Lee ),최윤영 ( Yun-young Choi ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.3

This is the study of Flow Characteristic by the Meander ratio of the river that firstly check the development degree of the river meander and select the small-midium streams has the cross-section data for this study, then do the Validation by the 2 Dimensional Numerical Model for Application and preform the analysis of the Flood Discharge ratio by the frequency of the 50yrs, 80yrs, 100yrs & 150 years of the selected streams accordingly. The destination stream for this study has selected to the Banbyeon-cheon located in Yeongyang-gun, Gyeongbuk, S. Korea as it having certain degree of Meander ratio of the river data and the recent cross-section of stream data, observed rainfall record level in the event data and discharge measurement data as it has implemented by the `Basic Investigation of the Nakdong River Water System (Gyeongbuk region) Water Resource` (Korea Water Resources Corporation, 2015). After this, adjusting the data artificially about the meander ratio of the river for the selected streams and applying again with the frequency of Flood discharge, then analysis the Flow Characteristic of the streams to compare.

기후변화에 따른 적정 취수량 산정을 위한 유량분석

임유성 ( Yu-seong Lim ),최윤영 ( Yun-young Choi ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.2

The purpose of this study is to identify the continuously changing stream flow according to climate change through analyzing so that it can be used as ground survey data for current status of water source supply capacity of streams in the community and for possibility of future problems that may occur. About Bukcheon which is used as a water source in Sangju city, the river runoff was analyzed using the TANK model and at the same time, it was also analyzed using observation data. As a result of examining data for the analysis using the observation data, it was confirmed that the observations were carried out since 1942, and therefore a lot of data could be obtained. However, the water level-flow relationship curve to using those data was not developed and the data accumulated over a long period of time could not be used. Therefore, in this study, we analyzed the observation data using data from 2006, when the water level-flow relationship curve was developed. The TANK model analysis for comparison with the observed data was conducted from 1987 to 2016 using long-term runoff data using daily precipitation data. And the comparisons and analysis results using actual observation data were comapred from 2006 to 2016. Currently in Sangju city, Bukchon is used as a water source and it is confirmed that 12,600 ㎥/day(0.146 ㎥/s) of water is planned to be taken. As a result of analysis using actual observation data, Bukcheon stream flow rate is 0.062 ㎥/s. The analysis shows that the minimum water flow rate of 0.4317 ㎥/s, plus the maintenance flow rate, estimated using the data of the Long-term Water Resources Plan (2006~2020) (2006) should flow in order for Buckchon to function as a stream.

분류식 하수관거 정비지역 유입수/침입수 조사 분석

임유성 ( Yu Seong Lim ),손병철 ( Byeong Chul Son ),최윤영 ( Yun Young Choi ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.2

This study compared and analyzed Night-time Domestic Flow Evaluation, Water Use Evaluation and BOD Evaluation by conducting the investigation of flux and water quality for one year from April 1, 2013 to March 31, 2014 targeting three treatment basins among Build-Transfer-Lease(BTL) sections of sewer pipe maintenance that was carried out nationwide regarding BTL section of sewer pipe maintenance in Sangju-si in 2005 aiming at providing basic data of installation status and maintenance of separate sewer pipe as the investigation and analysis of infiltrated and influent water at the separate sewer pipe maintenance area. As the results, it was judged that it was impossible to analyze Water Use Evaluation because the use of underground water was huge considering local characteristics of Sangju-si and the analysis of infiltrated and influent water (I/I) that is the method of investigating and analyzing night-time domestic flow and the status of night-time domestic flow of residence center for each administrative district and treatment basin was used in this study because it was judged that it was impossible to apply the characteristic factor during base period due to the change of water-collecting cycle and method when it comes BOD Evaluation. As the results of analysis, it was shown that the ratio of infiltrated was average 17.3% and infiltration rate was 0.29m3/d/cm/km in case of Jeungchon treatment basin, infiltrated was average 23.5% and infiltration rate was 0.61m3/d/cm/km in case of Mansan treatment basin and infiltrated was average 11.3% and infiltration rate was 0.03m3/d/cm/km in case of Shinheaung treatment basin. To summarizing analysis results of each treatment basin, the area with the lowest infiltration was Shinheaung treatment basin and the area with the highest infiltration was Mansan treatment basin among the investigated areas, and the average of investigated area was analyzed as 0.31m3/d/cm/km.

기후변화에 따른 장기유출 변동특성 분석

임유성 ( Yu-seong Lim ),이병준 ( Byung-joon Lee ),최윤영 ( Yun-young Choi ) 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.4

In terms of water resource management, the natural flow of rivers is stable water supply in water resource planning and water management and river environment, an important factor that has a great influence on many areas, such as permission for use of river water. The natural flow of the river is such an important factor it is actual flow rate measurement should be carried out to establish, a related plan according to the characteristics of the river, and water resource management should be carried out. In this study, analysis of natural flow changes according to climate change was conducted for four river(byeongseong, yeonggang, iancheon, seokcheon) basins in Sangju, Gyeongsangbuk-do. The natural flow analyzed using the measured data was analyzed to have a flow rate difference of at least 4.5 % to a maximum of 43 % compared to the natural flow predicted in 2014 (Sangju Sewerage Maintenance Master Plan). And in the natural flow analyzed using rainfall data from 2011 to 2020, it was analyzed that the flow rate difference occurred by at least 6.7 % to a maximum of 12.2 % compared to the existing predicted flow rate. Considering the climate change that has occurred since 2000, it is necessary to analyze the natural flow rate of rivers and establish a water resource management plan suitable for it through various methods such as analysis of rainfall discharge model using rainfall data.

보조 방류시스템 설치에 따른 하류하도의 수리학적 변동특성

이경기 ( Gyeong-kee Lee ),임유성 ( Yu-seong Lim ),최윤영 ( Yun-young Choi ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.4

This hydraulic model experiment analyzed plunge pool of downstream and sulfur change of downstream depending on discharge flow in order to produce the optimal design plan of auxiliary spillway to be established. To that end, hydraulic characteristics of existing spillway were examined and hydraulic model experiment was conducted on design 1 and 2. First, the results of design 1 show that discharge ability is fine, approach velocity is within limits, but there is a need for improvement through a baffle wall shape change as a whirlpool occurs because of a baffle wall. In the case of sulfur of downstream water flow discharged from steep spillway is not sufficiently reduced and flows into downstream in super-critical flow condition. And as for PMF, near the spilling basin of the existing spillway and spilling basin of auxiliary spillway, unstable phenomena and whirlpool of water surface partially occur, but when considering that water level change is not significant at measuring points in the cross section of downstream as the main flow direction is concentrating into the center of downstream, the danger regarding downstream is limited as found in the analysis. Lastly, the analysis found that the factors risking original functions and safety of spillway structure occurring in the design 1 do not occur in the design 2, and show stable flow characteristics compared with the design 1. Therefore, detailed data regarding size and form of plunge pool and distribution characteristics of flow going into downstream are secured additionally through experiments, they will serve as very useful basic data for designing auxiliary spillway of similar dams.

Iminothiazole carboxanilide 유도체의 항균활성에 미치는 2-phenylimino group의 영향

성낙도(Nack-Do Sung),유성재(Seong-Jae Yu),임치환(Chi-Hwan Lim),남기달(Ki-Dal Nam),한호규(Ho-Kyu Han) 한국농약과학회 1997 농약과학회지 Vol.1 No.1

비스 방향족 α,β 불포화 케톤 유도체 중 2-thienyl 및 2-furyl 치환체의 항균활성에 관한 비교분자장 분석(CoMFA)

성낙도(Nack-Do Sung),유성재(Seong-Jae Yu),임치환(Chi-Hwan Lim),赤松美紀(Miki Akamatsu) 한국농약과학회 1998 농약과학회지 Vol.2 No.2