논문 : 수질제어를 통한 관 내부 부식방지 기술의 정수처리공정 적용방안

서대근 ( Dae Keun Seo ),왕창근 ( Chang Keun Wang ) 대한상하수도학회 2006 상하수도학회지 Vol.20 No.4

Although final water of domestic water treatment plants almost contains highly corrosive characteristics, the countermeasures for eliminating internal corrosion of pipeline system have not been conducted yet by controlling water quality in plants. The technologies of internal corrosion control are to control water quality parameters(pH, Alkalinity, and Calcium Hardness etc.) and to use corrosion inhibitor. Under the conditions of domestic water treatment, first of all, the technologies of adjusting water quality parameters has to be considered. Otherwise, The technology of using corrosion inhibitor is favorably thought to be applied with the technology of adjusting water quality parameters in accordance with the result of availability for water treatment process. Since the technology of adjusting water quality parameter influences on other water treatment processes, the guideline of water quality management to be apt for water quality characteristic is required to be estabilished. While the selection of proper chemicals and technologies is dependent upon the raw water characteristics and water treatment process, typically, the technology of Ca(OH)2 & CO2 additions is considered more effective than other technologies in order to adjust pH and Alkalinity, increase Ca(2+) and form CaCO3 film

iGS를 이용한 모바일 로봇의 실내위치추정 알고리즘

서대근(Dae-Geun Seo),조성호(Sung-Ho cho),이장명(Jang-Myung Lee) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.3

As an absolute positioning system, iGS is designed based on ultrasonic signals whose speed can be formulated clearly in terms of time and room temperature, which is utilized for a mobile robot localization. The iGS is composed of an RFID receiver and an ultra-sonic transmitter, where an RFID is designated to synchronize the transmitter and receiver of the ultrasonic signal. The traveling time of the ultrasonic signal has been used to calculate the distance between the iGS system and a beacon which is located at a pre-determined location. This paper suggests an effective operation method of iGS to estimate position of the mobile robot working in unstructured environment. To expand recognition range and to improve accuracy of the system, two strategies are proposed: utilization of beacons belonging to neighboring blocks and removal of the environment-reflected ultrasonic signals. As the results, the ubiquitous localization system based on iGS as a pseudo-satellite system has been developed successfully with a low cost, a high update rate, and relatively high precision.

충돌 벡터를 이용한 이동로봇의 동적 장애물 회피

서대근(DaeGeun Seo),류은태(EunTae Lyu),이장명(JangMyung Lee) 제어로봇시스템학회 2007 제어·로봇·시스템학회 논문지 Vol.13 No.7

2001 년도 춘계 학술발표회 / 상수처리 (4) : 유기고분자응집제 실공정 도입 효과 분석

김선규,이태용,송영일,서대근 대한상하수도학회 2001 공동춘계 학술발표회 논문집 Vol.2001 No.-

Auto-Calibration을 이용한 Unstructured Environment에서의 실내 위치추정 기법

엄위섭(We-sub Eom),서대근(Dae-Geun Seo),박재현(Jae-Hyun Park),이장명(Jang-Myung Lee) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.2

This paper proposes a way of expanding the use area of localization technique by using a beacon. In other words, we have developed the auto-calibration algorithm that recognizes the location of this beacon by attaching the beacon on an arbitrary position and by using the information of existing beacon under this situation. By doing so, the moving robot can overcome the limitation that the localization of moving robot is only possible within the area that has installed the existing beacon since the beacon cannot be installed on the accurate location when passing through a danger zone or an unknown zone. Accordingly, the moving robot can slowly move to the unknown zone according to this auto-calibration algorithm and can recognize its own location at a later time in a safe zone. The localization technique is essentially needed in using a moving robot and it is necessary to guarantee certain degree of reliability. Generally, moving robots are designed in a way to work well under the situation that the surroundings is well arranged and the localization techniques of using camera, laser and beacon are well developed. However due to the characteristics of sensor, there may be the cases that the place is dark, interfering radio waves, and/or difficult to install a beacon. The effectiveness of the method proposed in this paper has been proved through an experiment in this paper.

수질 중 중금속(Cr, Ba) 숙련도 시험 평가

송대성,이정엽,이종운,서대근,최재원,김윤석 한국환경분석학회 2018 환경분석과 독성보건 Vol.21 No.1

In this study, the analytical techniques of 51 domestic and international institutions were assessed based on the proficiency testing of heavy metals. The proficiency testing samples that were prepared and distributed for this study were barium and chromium, of which their homogeneity and stability in water were ensured. Thirtyeight institutions and 45 institutions participated and submitted their results obtained from the analysis of barium and chromium, respectively. A statistical assessment on the proficiency test was conducted on the basis of the z-score and the results obtained are as follows: for barium, 1 institution was assessed as unsatisfactory and 6 as doubtful, and for chromium, 6 were assessed as unsatisfactory and 4 as doubtful. The testing institutions that had doubtful or unsatisfactory results need to consider the cause of causal analysis inaccuracies, including reference materials, glassware, inspection of the testing equipment and recalibration, test procedure reviews, tester training, and continuous participation in proficiency tests of relevant areas in order to promote efforts for improving and taking preventive measures for performance improvement.

Surveillance of viable Acanthamoeba spp. and Naegleria fowleri in major water sources for tap water in Korea

김민정,이규철,김건우,이현지,김민영,서대근,이정엽,조영철,Kim, Min-jeong,Lee, Gyu-Cheol,Kim, Kunwoo,Lee, Hyunji,Kim, Min Young,Seo, Dae Keun,Lee, Jeong Yeob,Cho, Young-Cheol The Microbiological Society of Korea 2018 미생물학회지 Vol.54 No.3

자유생활아메바인 가시아메바(Acanthamoeba spp.)와 파울러자유아메바(Naegleria fowleri)는 아메바성 뇌염 등 치명적인 질병을 일으키며, 물을 포함한 자연 환경에 널리 분포한다. 가시아메바와 파울러자유아메바가 한국의 주요 상수원수에 존재하는지 알아보기 위해 배양법에 기초한 실시간 중합효소연쇄반응법을 이용하여 2017년 7월부터 12월 사이에 한국의 52개 주요 상수원수를 조사하였다. 가시아메바와 파울러자유아메바가 각각 42개 시료(80.8%)와 6개 시료(11.5%)에서 검출되었다. 가시아메바의 경우 계절과 상관없이 고른 검출율을 보였으나, 파울러자유아메바는 주로 여름과 가을에 검출되었으며 겨울에는 검출되지 않았다. 이상의 결과는 이러한 자유생활아메바가 한국의 상수 원수에도 고루 존재한다는 것을 의미한다. The pathogenic free-living amoebas (FLAs), Acanthamoeba spp. and Naegleria fowleri, can cause fatal infections, including amoebic encephalitis. They are ubiquitously distributed in nature, including in diverse bodies of water. In order to survey Acanthamoeba spp. and N. fowleri in source water in Korea, we used culture-based real-time PCR to detect viable FLAs in 52 source water samples collected between July 2017 and December 2017. Acanthamoeba spp. and N. fowleri were detected in 42 samples (80.8%) and 6 samples (11.5%), respectively. Acanthamoeba spp. were detected at approximately the same frequency in all seasons, but N. fowleri was mainly detected in summer and autumn, with no N. fowleri detected in winter. These results demonstrate that these pathogenic FLAs, especially N. fowleri, which has caused deaths in the United States and China, are widely distributed in the Korean aquatic environment.

Surveillance of Acanthamoeba spp. and Naegleria fowleri in environmental water by using the duplex real-time PCR

김민정,이규철,김건우,이현지,김민영,서대근,이정엽,조영철,Kim, Min-jeong,Lee, Gyu-Cheol,Kim, Kunwoo,Lee, Hyunji,Kim, Min Young,Seo, Dae Keun,Lee, Jeong Yeob,Cho, Young-Cheol The Microbiological Society of Korea 2018 미생물학회지 Vol.54 No.2

가시아메바(Acanthamoeba spp.)와 파울러자유아메바(Naegleria fowleri)는 자유생활아메바로 자연계에 널리 분포하며 사람과 동물에게 치명적인 질병을 일으킨다. 본 연구에서는 가사아메바와 파울러자유아메바를 물 환경에서 조사하기 위해 기존에 보고된 네 종류의 분자생물학적 방법과 상용 real-time PCR 키트의 분석 민감도를 비교하였다. 그 결과 duplex real-time PCR 방법이 민감도가 가장 좋았으며, 동시에 두 종류의 자유생활아메바를 검출할 수 있었다. 따라서 이 방법을 사용하여 한국의 대전시에 위치한 3개 하천, 6개 지점을 대상으로 그 분포를 2회 조사하였다. 가시아메바는 12개 시료 중 10개 시료에서 검출되었으며(83.3%), 파울러자유아메바는 2개 시료에서 검출되었다(16.6%). 향후 이러한 유해 아메바로부터 먹는 물의 안전성을 확보하기 위해 지속적인 분포조사가 필요할 것이다. Naegleria fowleri and Acanthamoeba spp. are free-living amoebas that are widely distributed in natural environments. Although uncommon, infection with these protozoans can cause fatal disease in humans and animals. In this study, in order to select the appropriate method to survey Naegleria fowleri and Acanthamoeba spp. in water samples, four molecular biology techniques and one commercially available kit for real-time PCR were compared. The results indicated that the duplex real-time PCR was the most sensitive, and could be used to simultaneously detect two different free-living amoebas. Using the duplex real-time PCR approach, the two free-living amoebas were surveyed in three local streams in Daejeon, Republic of Korea. The concentrated free-living amoebas were inoculated onto non-nutrient agar plates which had been spread with heat-inactivated Escherichia coli and incubated for 5~7 days. After incubation, gDNA was extracted and used as the template for amplification by duplex real-time PCR. Acanthamoeba spp. and N. fowleri was detected from ten (83.3%) and two (16.6%) of the twelve samples, respectively. As these two free-living amoebas can be fatal, continuous surveillance is needed to track their distribution in the aquatic environment for the drinking water safety.

관망에서의 소독부산물 변화와 관련 영향인자들의 상관관계 분석

송영일(Young Il Song),안수나(Suna Ann),안성윤(Seoungyun Ann),서대근(Daeguen Seo),조혁진(Hyukjin Cho),이재성(Jaesung Lee),최일환(Ilwhan Choi),신창수(Changsoo Shin),이희숙(Hee Suk Lee) 大韓環境工學會 2016 대한환경공학회지 Vol.38 No.2

수돗물 공급과정에서의 소독부산물 발생현황과 이와 관련된 수질 인자와의 상관성을 조사하여 소독부산물 발생특성을 규명하고자 K-water에서 관리하는 정수장의 수돗물 공급과정 5개 계통에 대하여 조사를 실시하였다. 수돗물 공급과정에서의 공급계통별 Water age 및 노후관 공급계통을 구분하여 조사대상을 선정하였으며, 소독부산물인 트리할로메탄 (THMs) 및 할로아세틱에시드 (HAAs), 유기물 항목으로서 BDOC 및 DOC를 포함하여 7개 항목에 대해 월 1회 조사하였다. 조사결과 노후관계통 및 Water age가 길수록 공급과정 내 유기물 농도가 높아지는 경향성을 확인할 수 있었다. 소독부산물과 관련 영향인자들의 상관관계를 분석한 결과 계통별 잔류염소 감소와 Water age간 상관관계가 매우 높은 것으로 나타났다. 또한 Water age와 THMs 생성간의 결정계수값이 매우 높아 THMs 생성에 Water age가 중요한 인자임을 알 수 있었다. 잔류염소 감소율이 THMs 증가에 미치는 영향 또한 매우 높게 나타났으며, Water age가 길어질수록 수온과 THMs 생성에 미치는 영향은 증가하는 것으로 나타났다. 이와 반면 HAAs는 THMs와는 달리 Water age, 잔류염소, 수온과의 상관관계 조사결과 결정계수 값이 낮게 나타났다. The distributed systems managed by K-water were surveyed to study the characteristic of disinfection-by-product (Trihalomethans & Haloacetic acids) formation and the correlations between the concentrations of disinfection-by-product and physico-chemical parameters. Five distribted system were selected according to their water ages and the degree of deterioration of their pipelines. Total seven items including Trihalomethans (THMs), Haloacetic acids (HAAs), BDOC, DOC, pH, chlorine residual, and temperature were analysed in monthly basis. The concentration of organic matter were increased according to water age and pipeline deterioration in this study. The coefficient of determination between the decline of residual chlorine and the increase of water age was revealed as high. Also, the coefficient of determination between the decline rate of residual chlorine and the increase of the Trihalomethans concentration were studied as high. Furthermore the longer water age is the bigger the effect on Trihalomethans formation and temperature. However, the coefficient of determination between the concentraion of Haloacetic acid and water age, residual chlorine, and temperature were revealed as low in this study.

공급과정에서의 소독부산물 거동특성 조사

이희숙 ( Hee Suk Lee ),안수나 ( Su Na Ann ),안성윤 ( Sung Yun Ahn ),서대근 ( Dae Keun Seo ) 한국물환경학회(구 한국수질보전학회) 2015 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2015 No.-