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.

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.

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) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-

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.

온실용 얕은기초의 인발저항력 검토

윤성욱(Sung Wook Yun),최만권(Man Kwon Choi),이시영(Si Young Lee),강동현(Dong Hyeon Kang),문성동(Sung Dong Moon),유찬(Chan Yu),윤용철(Yong Cheol Yoon) (사)한국생물환경조절학회 2015 생물환경조절학회지 Vol.24 No.3

본 연구에서는 내재해형 플라스틱 온실과 유리온실의 기초에 대하여 인발저항력을 검토하기 위해 사질토 지반에서 실규모로 제작한 총 15개의 온실 기초를 이용하여 현장시험을 실시하였다. 그 결과, 대상 온실 기초의 최대인발저항력은 기초의 형태 및 규모가 서로 상이함에 따라 11.6 kN~82.4kN의 범위로 나타났다. 온실기초의 최대인발저항력 산정을 위해 제안된 이론식에 대하여 현장시험 결과를 이용하여 적용성을 검토한 결과 전반적으로 기존의 산정 이론식이 현장시험결과와 근접하는 수치를 제공하는 것으로 검토되었다. 다만, 본 연구에서 고려한 지반은 사질토 지반이며, 향후 점성토지반에 대하여 기존의 인발저항력 산정 이론식의 검증이 필요할 것으로 판단된다. In this study, a field test of uplift load was carried out using 15 greenhouse foundations fabricated in full scale on a sand soil to examine the uplift capacity of plastic film greenhouse and glasshouse foundations for disasterproof standard. As a result, the maximum uplift capacity of the target greenhouse foundations was shown to be in the range from 11.6kN to 82.4kN according to the differences between the forms and sizes of the foundation. As a result of the examination of the applicability using the field uplift load test result of the theoretical equation proposed for maximum uplift capacity calculation of greenhouse foundations, we found that in general, the conventional theoretical equation for the calculation provided numerical values close to the field test results. However, the soil considered in this study was a sand; thus, in the future, verifying the conventional theoretical equation for the uplift capacity calculation of a cohesive soil would be necessary.

온실 구조용 파이프의 부식속도 검토

윤성욱(Sung-Wook Yun),최만권(Man Kwon Choi),이시영(Si Young Lee),문성동(Sung Dong Moon),윤용철(Yong Cheol Yoon) (사)한국생물환경조절학회 2015 생물환경조절학회지 Vol.24 No.4

간척지 내 토양은 염분농도 및 함수비가 일반지역에 비해 상당히 높기 때문에 간척지에 매입된 온실의 부재는 높은 부식 환경에 노출된다. 염해의 환경에서는 파이프 골조로 이루어진 온실의 기초 및 기초와 이어진 파이프에 부식을 촉진시키기 때문에 이에 대한 보수/보강 기술개발 및 효율적인 유지 관리가 필요하다. 본 연구에서는 염해의 위험성이 높은 간척지에 적합한 온실의 유지관리, 보수/보강에 대한 기준을 마련하기 위한 기초자료로서 토양염분환경에서 온실부재의 부식속도를 측정하였다. 각 온실파이프는 염분농도가 0%, 0.1%, 0.3% 및 0.5%인 토양 및 수중환경에 관찰기간동안(480일) 노출시켜 부식속도를 측정하였으며, 그 결과 육안으로도 염분농도에 따른 부식정도의 차이가 뚜렷하게 관찰되었으며, 시험편의 표면이 검은색의 부식현상과 함께 비교적 고르게 부식되는 균일부식의 형태를 나타내었다. 논토양의 경우 염분농도 0, 0.1, 0.3, 0.5%에서 각각 0.008, 0.027, 0.036, 0.043mm·yr<SUP>-1</SUP>로 염분농도가 증가할수록 부식속도가 뚜렷하게 증가하는 경향을 나타내었고 밭토양의 경우, 염분농도 0, 0.1, 0.3, 0.5%에서 각각 0.0002, 0.039, 0.040, 0.039mm·yr<SUP>-1</SUP>의 부식속도를 나타내었다. 상대적으로 세립질이 많은 논토양에서 부식속도가 더 높은 것으로 나타났으며, 이는 입경이 작고 고르게 분포하는 토양에서 부식속도가 높은 일반적인 특성이 그대로 반영된 것으로 판단되었다. 간척지의 경우 토양의 입자의 세립 정도는 일반 내륙지역의 농경지 토양보다 높을 것으로 예상되기 때문에 파이프 부식에 대한 철저한 대비가 있어야 할 것으로 판단되었다. Because soils in reclaimed lands nearby coastal areas have much higher salinity and moisture content than soils in inland area, parts of greenhouses embedded in such soils are exposed to highly corrosive environments. Owing to the accelerated corrosion of galvanized steel pipes for substrucrture and structure of greenhouses in saline environments, repair and reinforcement technologies and efficient maintenance and management for the construction materials in such facilities are required. In this study, we measured the corrosion rates of the parts used for greenhouse construction that are exposed to the saline environment to obtain a basic database for the establishment of maintenance and reinforcement standards for greenhouse construction in reclaimed lands with soils with high salinity. All the test pipes were exposed to soil and water environments with 0, 0.1, 0.3, and 0.5% salinity during the observation period of 480 days. At the end of the observation period, salinity-dependent differences of corrosion rate between black-surface corrosion and relatively regular corrosion were clearly manifested in a visual assessment. For the soils in rice paddies, the corrosion growth rate increased with salinity (0.008, 0.027, 0.036, and 0.043mm·yr<SUP>-1</SUP> at 0, 0.1, 0.3, and 0.5% salinity, respectively). The results for the soils in agricultural fields are 0.0002, 0.039, 0.040, and 0.039mm·yr<SUP>-1</SUP> at 0, 0.1, 0.3, and 0.5% salinity, respectively. The higher corrosion rate of rice-paddy soil was associated with the relatively high proportion of fine particles in it, reflecting the general tendency of soils with evenly distributed fine particles. Hence, it was concluded that thorough measures should be taken to counteract pipe corrosion, given that besides high salinity, the soils in reclaimed lands are expected to have a higher proportion of fine particles than those in inland rice paddies and agricultural fields.

온실 기초용 나무말뚝의 인발저항력 검토

윤성욱(Sung Wook Yun),최만권(Man Kwon Choi),이시영(Si Young Lee),유찬(Chan Yu),윤용철(Yong Cheol Yoon) (사)한국생물환경조절학회 2015 생물환경조절학회지 Vol.24 No.2

나무말뚝은 국내 온실에서는 적용된 사례는 많지 않으나 네덜란드에서는 비교적 많이 사용되고 있다. 강관말뚝 및 PHC말뚝에 비해 경제적이고 공기가 단축되며 친환경적 공법이라는 장점을 가지고 있다. 부식방지를 위해 지하수면 아래에서 시공되어야 하는 제한적 조건이 있으나 국내 간척지의 경우 지하수위가 높은 지역이 많기 때문에 간척지에서 온실기초 보강을 위한 나무말뚝의 활용도는 높을 것으로 예상된다. 본 연구에서는 간척지에서 나무말뚝기초에 대한 기초설계자료를 제공할 목적으로 현장인발재하시험을 통해 나무말뚝기초의 인발저항력을 측정하였고, 기초 설계시 기존의 인발저항력 산정 이론식에 대한 적용성을 검토하기 위해 현장인발재하시험을 통해 얻어진 최대인발저항력과 기존의 인발저항력산정 이론식을 비교하여 검토하였다. 본 연구에서 사용한 나무말뚝의 수종은 소나무이며, 직경 25cm와 직경 30cm의 나무말뚝에 대하여 근입깊이 1m, 3m, 5m별로 현장인발재하시험을 진행하였다. 그 결과, 나무말뚝의 인발저항력은 근입깊이가 증가할수록 선형적으로 뚜렷하게 증가하는 경향을 보였으며, 근입깊이 5m를 기준으로 최대인발저항력은 직경 25cm와 직경 30cm의 나무말뚝이 각각 9.38tf, 10.56tf로 모두 9tf 이상의 인발저항력이 나타났다. 나무말뚝의 최대인발저항력 산정을 위해 기존의 산정 이론식에 대한 적용성을 검토한 결과, a 방법으로 부터 얻어진 인발저항력의 경우 전반적으로 현장시험결과에 근접하는 수치를 제공하는 것으로 나타났고 Das & Seeley 이론식의 경우 현장타설말뚝과 강관말뚝의 인발저항력 값 사이에 현장시험의 나무말뚝의 인발저항력 값이 위치하는 것으로 나타났다. Wood piles are rarely used in the construction of a greenhouse in Korea, but they are relatively more often used in other countries, such as the Netherlands. There are several advantages associated with wood piles: they are more cost-effective, less time-consuming, and more ecofriendly than the steel pipes (SPs) and pre-stressed highstrength (PHC) piles. However, one of the limiting conditions is that they have to be installed below the groundwater level to prevent decay. Since the groundwater levels are generally high in the reclaimed lands in Korea, wood piles are expected to be used often as reinforcements for foundations of greenhouses in these areas. In this study, we measured the uplift capacities of wood piles through in-situ uplift capacity tests with an aim to provide basic design data for wood pile foundations. In order to test their applicability, we then compared these experimentally measured ultimate uplift capacities with the ones calculated through some of the existing theoretical equations. The wood piles used in the loading tests were made of softwood (pine wood), and the tests were performed using piles with different diameters (Ø25cm and Ø30cm) and embedded depths (1m, 3m, and 5m). The test results revealed that the uplift capacity of the wood piles showed a clear linearly increasing tendency in proportion to the embedded depth, with the ultimate uplift capacities for the diameters 25cm and 30cm being 9.38 and 10.56tf, respectively, at the embedded depth of 5m; thus demonstrating uplift capacities of ≥ 9tf. The comparison between the actually measured values of the uplift capacity and the ones calculated through equations revealed that the latter, which were obtained using the α method, were generally in an approximate agreement with the in-situ measured values.

학생선수의 스트레스강인성과 코치지원 및 스포츠탈진의 관계

윤성욱(Yun, Sung-Wook),윤용진(Yoon, Yong-Jin),최석환(Choi, Suk-Hwan) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.2

This research intends to provide the basic data for the student athlete’s efficient and positive use of their time that is on increase. For this purpose, The present study examines the student athlete’s stress hardiness and coach support and also sport bum-out studied their influence on the sport bum-out. Convenience sampling, which is a non-probability sampling, was used. Among a total of 280 questionnaires distributed, 265 copies were collected back. And the questionnaires that were insincerely replied, double-replied or judged useless for the study were excluded and a total of 257 questionnaires were analyzed. In order to get the objective propriety of the contents of the questionnaire, one professor in the major and three researchers verified it. For the analysis of the data, SPSS 18.0 version for Windows and AMOS 15.0 for the verification of mediating effects. At this time, the level of statistical significance was set at a=.05 and the results of the analysis are as follows: First, the result of examining the influence of the stress hardiness on the coach support partly influenced. Second, the result of examining the influence of the stress hardiness on the sport bum-out were partly influenced. Third, the result of examining the influence of the coach support on the sport bum-out were partly influenced. Fourth, the result of examining the influence among the stress hardiness, coach support and sport bum-out through each of direct and indirect ways.

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.