폐금속 광산 주변 농경지 토양에서 석회석 처리에 의한 중금속의 식물유효도 변화 및 작물의 중금속 축적

윤성욱,유찬,Yun, Sung-Wook,Yu, Chan 한국농공학회 2012 한국농공학회논문집 Vol.54 No.3

As topographic characteristics of Korea where 64 % of the national land area is forest and only 17 % is being used as farmland, remediation of farmland contaminated by heavy metals is a considerably important issue. In this study, as an alternative of practically and effectively remediating farmland which was abandoned as its crop plants exceeded maximum residue limit of heavy metals due to mining impact, applicability of stabilization method was examined through the pilot-scale field experiment. Three plots ($L{\times}W{\times}D=3m{\times}2m{\times}0.3m$) were installed at the selected farmland and in plot 1, only soil of the selected farmland was applied, in pilot 2, soil of the selected farmland plus 3 % limestone (w/w) was applied and in pilot 3, soil of the selected farmland plus 3 % limestone was applied and then uncontaminated soil was covered thereon (0.3 m). After that, seeds of radish, Korean cabbage and soybean of which characteristics of edible portions are different were sowed on each plot and cultivated. Afterwards, at a proper harvesting time (app. 80 days later), crop plants and soil were collected and phytoavailability (0.11 M HOAc extractable) of heavy metals in soil and accumulated concentration of heavy metal in edible portion of crop plants were examined. As a result, it was revealed that phytoavailability of heavy metals in soil added with limestone (plot 2) was clearly reduced compared with plot 1 (untreated) and owing to this treatment, accumulated concentration of heavy metals in edible portion of crops was also clearly reduced compared with plot 1. While radish cultivated in plot 1 had exceeded maximum residue limit of agricultural products, in particular, plot 2 using limestone had shown concentration lower than maximum residue limit and this plot had shown little difference with 3 plot where crop was cultivated in uncontaminated soil cover. Therefore, it was considered that for abandoned farmland like the selected farmland, reducing mobility and phytoavailability of heavy metals and reducing crop uptake through stabilization method would be an effective and practical alternative for producing safe agricultural products on a sustained basis.

폐금속 광산의 영향을 받는 농경지 토양 내 금속성분 오염의 공간적 분포특성: 충청남도 부여군의 사례연구

윤성욱,김동현,강동현,이시영,손진관,김해도,윤용철,유찬,Yun, Sung-Wook,Kim, Dong-Hyeon,Kang, Dong-Hyeon,Lee, Si-Young,Son, Jinkwan,Kim, Hae-Do,Yoon, Yong-Chel,Yu, Chan 한국농공학회 2017 한국농공학회논문집 Vol.59 No.6

In this study, the concentrations of As, Cd, Cu, Pb and Zn in agricultural soils across a region of South Korea (Buyeo County) were investigated. Their pollution sources were assessed using multivariate statistical analysis, and Geographic Information System (GIS) technology was used to determine the distribution of these elements. Surface soil samples were collected from 114 locations across the agricultural fields in the study site. Cu and Zn were derived from natural sources (i.e., parent rocks of the soil), whereas As, Cd, and Pb were found to be originated from abandoned mines. The results of this study clearly show that the transport of anthropogenic As, Cd, and Pb is governed mostly by the specific environment of the paddy soil. Our approach was effective in clearly identifying the sources of metals and analyzing their contamination characteristics. We believe this study will provide useful information to future studies on soil pollution by anthropogenic sources.

논토양의 환원환경에서 비소 및 중금속의 용출특성과 제강슬래그의 처리효과

윤성욱,유찬,윤용철,강동현,이시영,손진관,김동현,Yun, Sung-wook,Yu, Chan,Yoon, Yong-Cheol,Kang, Dong-Hyeon,Lee, Si-Young,Son, Jinkwan,Kim, Dong-Hyeon 한국농공학회 2016 한국농공학회논문집 Vol.58 No.3

There have been only a few studies focused on the stabilization of metal (loid)s in anaerobic soils such as paddy soils. In this study, laboratory-scale column tests were conducted to artificially manipulate anoxic conditions in submerged paddy fields and we observed the release behavior of As, Cd, Pb, and Zn, as well as to examine the stabilization effect of steel refining slag (SRS) on the metal(loid)s. The leachate samples were collected and chemical parameters were monitored during the test period. Results suggest that anoxic conditions were developed during submersion, and that As or heavy metals (particularly Cd) fractions bound to ferrous (Fe) /manganese (Mn) oxides were easily dissociated. Moreover, As is also reduced by itself to a trivalent form with higher mobility in the reducing environment of rice paddy soil. However, it was also shown that SRS significantly decreased the dissolution of Zn, Pb, Cd, and As in the the leachates; their removal rates in the SRS-treated soil were 66 %, 45 %, 24 %, and 84 %, respectively, of those in the control soil.

말에서 분리한 Escherichia coli의 특성 및 항생제 감수성

윤성욱,권도연,최성균,이희수,조길재,Yun, Sung-Wook,Kwon, Do-Yeon,Choi, Seong-kyoon,Lee, Hee-Soo,Cho, Gil-Jae 대한수의학회 2010 大韓獸醫學會誌 Vol.50 No.3

This study was conducted to investigate characteristics and antimicrobial susceptibility of Escherichia (E.) coli isolates isolated from vaginal mucosa and clitorial fossa of 105 Thoroughbred mares suspicious of the genital disease in Korea during the period from March 2006 to July 2007. Ninety six E. coli isolates were identified as standard biochemical properties and using BIOLOG system. Fifty three isolates (55.2%) could be classified into a total of 21 O serotypes and forty three isolates (44.8%) were non-typeable with 51 O antisera used in this study. The verotoxin 1 (VT 1) and verotoxin 2 genes were analyzed by multiplex PCR. Among them, one isolate was detected VT 1 gene (130 bp). Most of isolates showed a high susceptibility in ciprofloxacin (100%), enrofloxacin (100%), norfloxacin (100%), cefoxitin (96.9%), gentamicin (96.9%), sulphamethoxazole (96.9%), nitrofurantoin (94.8%), amikacin (93.8%), nalidixic acid (92.7%) and tetracycline (90.6%). These results may provide the basic information to establish strategies for the treatment and prevention of reproductive disease in Thoroughbred mares in Korea.

온도하중을 받는 이중합성구조의 거동해석

윤성욱 ( Yun Sung Wook ),신동훈 ( Shin Dong Hoon ),성원진 ( Sung Won-jin ),이용학 ( Lee Yong-hak ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1

An analytical method to analyze the composite girders subjected to temperature change is presented in which the sectional analysis calculates the axial and curvature strains based on the force and moment equilibriums. The deflection of the box girder approximated by the quadratic polynomial function is calculated by applying to the proper boundary conditions in the consecutive segments. Numerical applications are made for the 3-span double composite steel box girders which is a composite bridge girder filled with concrete at the bottom of the steel box in the negative moment region. The numerical results are compared with those of the three dimensional finite element analysis. Close agreement is observed between two methods.

유류오염부지의 복원설계

윤성욱 ( Yun Sung-wook ),조병진 ( Cho Byung-jin ),유찬 ( Yu Chan ) 한국농공학회 2005 한국농공학회 학술대회초록집 Vol.2005 No.-

The procedure of investigation and design of the soil contaminated with petroleum was introduced. Soil and water quality analyses were carried out to figure out the type of contaminants and the flume range according to the national regulation. In the investigation, it was verified that the soils in several dispersed locations were contaminated with petroleum. Therefore, in the design process, it was necessary to select a optimal remediation method after making the conception model of the site, and then the treatment method of incineration was selected.

온실용 다겹보온자재의 보온성 및 내구성 검토: 현장조사를 통한 사례연구

윤성욱 ( Sung-wook Yun ),최덕규 ( Duk-kyu Choi ),강동현 ( Dong-hyeon Kang ),박민정 ( Min-jung Park ),유찬 ( Chan Yu ),김동현 ( Dong-hyeon Kim ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-

연동시설에서 다겹보온자재의 활용은 최대 48.9%의 에너지 저감율을 기대할 수 있기 때문에 보온커튼의 설치 면적은 2010년 5,938 ha에서 2016년 7,126 ha로 다겹보온자재를 사용하는 온실 농가는 크게 증가하였다. 다겹보온커튼은 그 특성상 예인식, 권취식 등 개폐방식에 따라 사용 환경이 달라지고, 온실의 광환경 및 높은 습도 환경에 의해 사용 경과시간에 따라 보온성 및 내구성이 크게 저하될 수 있다. 그러나 현재 관련 연구들은 다겹보온자재의 보온성과 그 개선 효과에만 집중이 되어 있으며, 다겹보온자재의 내구성 판단 및 교체기간 등의 설정을 위한 연구는 미미하다. 본 연구에서는 온실 농가에서 실제 사용하고 있는 다겹보온자재(사용기간: 4∼18년)를 채취하였으며, 이를 시편으로 하여 그 보온 특성과 내구성을 대조구 시편과 비교분석하였다. 보온특성은 스티로폼 단열박스를 이용하여 보온자재 표면의 관류전열량을 측정하는 방식으로 이루어졌고, 측정이 완료된 시편에 대해서는 관련공정시험법에 준하여 인장강도가 측정되었다.

위성항법 수신기의 운용 모드 전환 제어

윤성욱(Sung Wook Yun),안우근(Woo-Geun Ahn),정원희(Won-Hee Jung),현종철(Jong-Chul Hyun),정준우(Junwoo Jung),원현희(Hyunhee Won) 한국통신학회 2024 한국통신학회 학술대회논문집 Vol.2024 No.6

온실의 잉여 태양에너지 회수용 FCU 소요대수 검토

윤성욱(Sung-Wook Yun),최만권(Man Kwon Choi),김하늘(Ha Neul Kim),강동현(Donghyeon Kang),이시영(Siyoung Lee),손진관(Jinkwan Son),윤용철(Yong Cheol Yoon) (사)한국생물환경조절학회 2016 생물환경조절학회지 Vol.25 No.2

본 연구에서는 이미 보고된 잉여 태양에너지 관련 연구결과와 현재 현장에 설치되어 있는 냉난방용 FCU 현황을 개략적으로 검토한 후, 잉여 태양에너지 회수에 필요한 FCU의 소요대수 결정 방법을 개략적으로 제시하여 앞으로 이 분야의 연구자 및 기술자들에게 기조자료를 제시할 목적으로 연구를 수행하였다. 실험기간 동안 최대, 평균 및 최저 외기온은 각각 28.2℃, 4.4℃ 및 -11.5℃정도였다. 온실 밖의 수평면 일사량은 0.8~20.5MJ·m<SUP>-2</SUP>로 정도의 범위였으며, 평균 및 총 일사량은 10.8MJ·m<SUP>-2</SUP> 및 1,187.5MJ·m<SUP>-2</SUP>으로 나타났다. 그리고 주간동안 온실 내의 평균기온과 상대습도는 각각 18.8~45.5 및 53.5~77.5%정도였다. 실험기간 동안 온실로부터 회수한 총 잉여 태양에너지는 6,613.4MJ정도로서 총 난방에너지인 98,600.2MJ 약 6.7%정도를 보충할 수 있을 것으로 나타났다. 또한 사양이 유사한 FCU를 사용하지만, 난방을 위하여 설치되는 FCU의 대수는 제각각 다른 것을 알 수 있었고, 좀 더 효율적이고 경제적인 관점에서 설치높이, 방향 및 설치 간격, 적정 대수에 대한 연구가 이루어져야 할 것으로 판단된다. 잉여 태양에너지 회수용 FCU의 적정 소요대수는 FCU를 통과하는 공기의 질량 및 순환유량을 기준으로 각각 8.4~10.9대 및 6.1~8.0대 정도이었다. 여기에 계산방법이나 FCU의 효율 및 사용 환경 등 위험률을 고려하면, 결국 9대 전후(약 24m<SUP>3</SUP>당 1대 정도)를 설치하면 될 것으로 판단되었다. In this study, previously reported surplus solar energy-related study result and current status of fan coil unit (FCU) for cooling and heating installed in the current sites were briefly examined and then a method to determine the number of FCUs required to recover surplus solar energy was schematically proposed to provide basic data for researchers and technical engineers in this field. The maximum, mean, and minimum outside temperatures during the experiment period were about 28.2℃, 4.4℃, and -11.5℃, respectively. The horizontal surface solar radiation level outside the greenhouse was in a range of 0.8-20.5MJ•m<SUP>-2</SUP> and mean and total solar radiation were 10.8MJ•m<SUP>-2</SUP> and 1,187.5MJ•m<SUP>-2</SUP>. The mean temperature and relative humidity in the greenhouse during the daytime were in a range of 18.8-45.5 and 53.5-77.5%. The total surplus solar energy recovered from the greenhouse during the experiment period was approximately 6,613.4MJ, which could supplement about 6.7% of the total heating energy 98,600.2 MJ. In addition, the number of FCUs installed for heating varies case to case, although similar FCUs are used. Thus, it is necessary to study the installation height, orientation and installation distance as well as the appropriate number of FCUs from the efficient and economical viewpoints. The required numbers of FCUs for surplus solar energy recovery were 8.4-10.9units and 6.1-8.0units based on air mass and circular flow rate that passed through the FCUs. Considering calculation methods and the risks such as efficiency and use environments of FCUs, it was found that about nine units (one unit per 24 m<SUP>3</SUP> approximately) needed to be installed. The required number of FCUs for surplus solar energy recovery was around one unit per 24m<SUP>3</SUP> approximately.

상추재배를 위한 시설하우스 배액의 비효평가 - 무기태 질소를 중심으로 -

윤성욱 ( Yun Sung-wook ),임주미 ( Lim Ju-Mi ),문종필 ( Moon Jongpil ),장재경 ( Jang Jaekyoung ),박민정 ( Park Minjung ),손진관 ( Son Jinkwan ),이현호 ( Lee Hyun-ho ),서효민 ( Seo Hyomin ),최덕규 ( Choi Duk-Kyu ) 한국농공학회 2021 한국농공학회논문집 Vol.63 No.4

The feasibility of HWS for agricultural use was analyzed through a crop cultivation test to utilize the hydroponic waste solution (HWS) generated from the nutriculture greenhouse. The fertilizing effect of HWS was assessed on the basis of the inorganic nitrogen (N) mostly existed in HWSs, and nitrogen (urea) fertilizer. Lettuce was selected as the target crop influenced by the soil treatment and also for the crop cultivation test. Thus, the change in growth characteristics of lettuce and that in chemical characteristics of the soil were investigated. In terms of the growth of lettuce, the C control group with 70% nitrogen (urea) fertilizer and 30% HWS and the D control group with 50% nitrogen (urea) fertilizer and 50% HWS were more effective than the practice control group (B) with 100% nitrogen (urea) fertilizer. The results of this study confirmed the combined applicability of the chemical fertilizer and HWS for crop cultivation. Because NO3-N present in HWS has a high possibility of leaching into the soil, its applicability as a fertilizer has been considered to be relatively low in Korea. However, if an appropriate mixing ratio of urea fertilizer and HWS could be applied, the problems associated with leaching of nitrate nitrogen could be reduced with beneficial effects on crop cultivation. Thus, future studies are required on the treatment effect of HWS with repeated cultivation, impact assessment on the surrounding environment, and appropriate fertilization methods using nitrogen (urea) fertilizer and HWS. These studies would facilitate the sustainable recycling of HWS.