제주도 지하수 질산염 농도의 시·공간적 변화 특성: 장기(1993-2015) 모니터링 자료의 평가

김호림(Ho-Rim Kim),오준섭(Junseop Oh),도현권(Hyun-Kwon Do),이경진(Kyung-Jin Lee),현익현(Ik-Hyun Hyun),오상실(Sang-Sil Oh),감상규(Sang-Kyu Kam),윤성택(Seong-Taek Yun) 대한자원환경지질학회 2018 자원환경지질 Vol.51 No.1

1993년부터 2015년까지 관측된 제주도 지하수 장기모니터링 관측정(N = 4,835)에서 수집된 지하수 수질자료(N = 21,568)를 기반으로 질산성질소의 시공간적 변동 특성을 평가하였다. 제주도 지하수의 질산성질소 농도의 중앙값은 2.5 mg/L로서 다른 국가나 대륙의 조사 결과에 비해 다소 높거나 유사한 것으로 나타났다. 또한 지하수 용도, 행정구역 및 고도 별로 유의한 차이를 보였다. 특히, 산간 지역에 비해 저지대 해안가에 위치한 농업 및 주거지역에서 농도가 높음을 확인하였다. Mann-Kendall 및 Sen’s slope 분석을 활용한 질산성질소 농도의 추세 분석 결과, 하류 저지 대에 비해 중산간지역에서의 질산성질소 농도 증가 경향이 뚜렷하였다. 제주도 내 토지 피복의 시계열 변화 특성과 결부 지어 보면, 중산간지역의 오염 증가 추세는 농업지역의 확장 등 인위적 활동 증가에 기인한 결과로 판단된다. 반면,기지정된 지하수자원특별관리구역에서는 전반적으로 질산성질소 농도의 감소 경향이 나타났는데, 이는 지하수 관리 측면에서 수질관리를 위한 적극적인 정책이 유효함을 시사한다. 본 연구에서는 제주도 지하수의 질산성질소 오염관리를 위한 적정 방안을 제안한다. The spatio-temporal variations of nitrate concentrations in groundwater of Jeju Island were evaluated by an analysis of time series groundwater quality data (N = 21,568) that were collected from regional groundwater monitoring (number of wells = 4,835) for up to 20 years between 1993 and 2015. The median concentration of NO 3 -N is 2.5 mg/L, which is slightly higher than those reported from regional surveys in other countries. Nitrate concentrations of groundwater in wells tend to significantly vary according to different water usage (of the well), administrative districts, and topographic elevations: nitrate level is higher in low-lying agricultural and residential areas than those in high mountainous areas. The Mann-Kendall trend test and Sen’s slope analysis show that nitrate concentration in mid-mountainous areas tends to increase, possibly due to the expansion of agricultural areas toward highland. On the other hand, nitrate concentrations in the Specially Designated Groundwater Quality Protection Zones show the temporally decreasing trend, which implies the efficiency of groundwater management actions in Jeju. Proper measures for sustainable groundwater quality management are suggested in this study.

동화 관련 활동이 유아의 창의성 증진에 미치는 효과

권창길 ; 이기영 ; 고윤희 ; 최성열 김천대학교 2005 김천대학교 논문집 Vol.26 No.-

This study is to find out about the effect of children's stories and related activities on the creativity of children by conducting a research on 90 5-year-olds attending Kindergraten B in Gumi City and Kindergarten F ing Gimcheon City.

소포제를 이용한 초속경 LMC의 특성 개선연구

윤경구,김성환,정원경,권혁찬 강원대학교 부설 석재복합신소재 제품연구센터 2003 석재연 논문집 Vol.8 No.-

본 논문은 콘크리트 배합시 발생하는 과도한 기포 발생 문제점을 해결하기 위하여 최적의 소포제 종류 및 혼입률 범위를 산정하여 초속경 라텍스개질 콘크리트 성능을 개선하는 것이다. 초속경 라텍스개질 콘크리트 실험은 2종류의 소포제 A, C와 혼입률 0, 1, 2, 3%을 주요 변수로 하여 공기량 시험, 압축강도 및 휨강도 시험을 수행하였다. 또한, 내구성 평가를 위하여 염소이온 투과실험도 수행하였다. 초속경 라텍스 개질 콘크리트의 공기량시험 결과 소포제 종류에 상관없이 소포제 혼입률 1%이상 첨가시 공기량은 50%이상 감소하였다. 또한, 소포제 첨가에 의한 기포 발생량 감소에 의해서 압축강도의 증진을 이루었다. 초속경 라텍스개질 콘크리트 실험은 A, C 소포제로 선정하여 실험을 수행하였다. 초속경 라텍스개질 콘크리트의 강도 특성에서는 A 소포제 혼입률 1%에서 압축강도 235kgf/㎠ , 휨강도는 조기 교통개방에 요구되는 휨강도 기준 45kgf/㎠를 초과하는 49kgf/㎠를 나타내었다. The purpose of this study was to remove the excessive air foaming which was produced in mixing the RSLMC(latex-modified concrete with rapid-setting cement) by choosing the best antifoam agent type and the optimized quantity for performance improved RSLMC. The main experimental variables such as antifiamer types(A, C), antifoamer contents(0, 1, 2, 3%), and latex contents(15%). Air content test and compressive, flexural tests were carried out to measure the improved properties of RSLMC. the rapid chloride permeability was carried out to estimate a durability of RSLMC. The results of RSLMC showed that the decrease of 50% air content was obtained by admixturing a antifoam agent by 1%. Two kinds and the optimized quantities of antifoam agent were selected for using in RSLMC. The results of RSLMC were obtained at a latex content of 15% and a antifoam agent quantity of 1% with antifoamer A type. The compressive strength and flexural strength at 3 hours after RSLMC placement were 235kgf/㎠ and 49kgf/㎠, respectively, which exceeded the flexural strength criterion of 45kgf/㎠ in order to open the RSLMC placed to traffic.

숯첨가 사료투여가 넙치의 면역반응에 미치는 영향

권문경,이윤호,박상언,김봉석,박수일 한국어병학회 2002 한국어병학회지 Vol.15 No.1

숯첨가 사료 투여가 넙치에 미치는 영향을 알기 위하여, 넙치에 숯 1%, 3%, 5% 첨가사료를 8주간 투여하면서 성장, 혈액성분, 비특이적면역능을 분석하였으며 어병세균인 Edwardsiella tarda 균의 공격 시험에 대한 방어능을 조사하였다. 숯 첨가 사료 투여는 넙치의 성장과 라이소자임 활성에서는 유의적인 차이를 나타내지 못했지만, 5% 숯첨가구에서 혈액 중의 total protein과 cholesterol의 농도가 대조구에 비하여 낮게 나타났다. 그리고, 숯 3% 첨가구에서 두신 식세포의 활성 및 병원성 세균인 E. tarda에 대한 방어능도 가장 높게 나타났다. The charcoal effects on the immune responses of flounder, Paralichthys olivaceus were studied. Fish were fed an experimental diet supplemented with 1%, 3% or 5% of charcoal to a commercial diet. Several factors such as weight gain, hematological parameters, nonspecific immune responses and resistance against Edwardsiella tarda were evaluated 4 and 8 weeks after the administraion. The changes of body weight and lysozyme activities were not signigicant among tested groups. But cholesterol and total protein concentration in the blood were significantly lower in the 5% supplemented group than in the control. The production of superoxide by macrophage from the head kidney, examined by NBT reduction, was significantly higher in the 3% charcoal supplemented groups than in the control. The survival rate after an artificial challenge with 1×10^exp(7) cells of E. tarda per fish was significantly the highest in the 3% charcoal supplemented group.

일반 교육-특수교육 완전 통합을 위한 기초 연구 : 탐구조사 An Exploratory Study

권상혁,황윤한 국립특수교육원 1995 특수교육연구 Vol.2 No.-

Total integration is the most ethical and humanistic way of teaching exceptional children. The purpose of this study were 1) to examine the problems in special education, 2) to investigate the reasons for being unable to integrate exceptional children with their non-handicapped peers, and 3) to obtain suggestions to accentuate total integration recommended by special education teachers. Thirty-seven elementary school special education teachers participated in this study. Problems in special education practice pointed by special education teachers vary from the lack of perceptions of educational leaders, teachers, students, and students to the education of quality special education teachers. Reasons for being unable to integrate exceptional children with their non-handicapped peers were also related to the problems in current special education culture. Special education teachers suggested various ways to accentuate total integration.

엔로플록사신 액제의 닭 호흡기 및 소화기 감염증에 대한 예방 및 치료효과

윤효인,박병권,조준형,정상희,박경환,장범수,김종춘,황윤환,임종환,이내경,박승춘 충남대학교 수의과대학 동물의과학연구소 2000 動物醫科學硏究誌 Vol.8 No.-

We evaluated the efficacy of the liquid form of enrofloxacin against poultry respiratory and digestive infections, the major problems in the poultry industry, from diverse diagnosis viewpoints. Results obtained through this study were as follows: 1. The liquid form of enrofloxacin showed good acceptability to poultry owing to no abhorrence to the drug by chickens, which indicated its suitability for mixing in drinking water. 2. The application of the enrofloxacin formulation improved the productivity of the chicken farm to a great extent by lowering the death toll of chicken raised in the farm. 3. The use of the drug shortened the days to the market, and increased the body weight at the time of marketing. 4. Preventive and therapeutic effects of the liquid enrofloxacin were observed higher than ampicillin, a major antibiotic used in poultry farming. From above results, the liquid form of enrofloxacin would find its use for the prevention and treatment of digestive and respiratory infections, let alone the growth promotion and feed efficiency, especially in the chicken farming practice.

Vermicomposting에 의한 유기성 슬러지와 음식물쓰레기의 병합처리

권영택,윤지훈,이상희 경남대학교 환경문제연구소 2000 환경연구 Vol.23 No.-

Generating rate of food waste in Korea is relatively high as 11,793ton/day corresponding 26.5% of municipal solid waste(USA 25%, England 19% and Germany 28%). Food waste is now separated from other solid wastes by solid waste management law and efforts of NGO. Thus, there is a need to develop effective and efficient technologies of food waste treatment. In this study, vermicomposting was applied to food waste mixed with sludges from a pulp and paper industry. Lumbricus rubellus grew and reproduced favorably in mixtures of organic sludge containing up to 70% of food waste. The casting was rich in nitrogen and phosphorus with 19.9 ~ 20.6 of C/N ratio.

N-(benzenesulfonyl)-C-(N-methylanilino)imidoyl Chloride 유도체의 가수분해 반응 메카니즘

權奇星,宋倫伊 충남대학교 기초과학연구소 1995 연구논문집 Vol.15 No.-

25℃dml 50%(v/v) 메탄올-물의 혼합용매 속에서 N-(benzenesulfony)-C-(N-methylanilino)imidoyl chloride 유도체의 가수분해 반응 속도 상수를 자외선 분광광도법으로 측정하여 반응속도식, 치환기효과, 용매효과, 염효과, 열역학적 할성화 파라미터 및 가수분해 생성물의 분석 등의 결과로부터 pH9.0 이하의 범위에서는 azocarbonium ion 중간체를 지나는 S_N1형 반응, pH 10.0 이상의 pH에서는 사면체 중간체를 지나는 친핵성 첨가-제거반응(Ad_N-E)이 일어남을 제안하였다. Rate Constants of hydrolysis of N-(benzenesulfonyl)-C-(N-methylanilino)imidoyl chlorides were determined by UV spectrophotometry in 50%(v/v) aqueous methanol at 25℃. On the basis of rate equation, substituent effect, solvent effect, salt effect, thermodynamic parameters and hydrolysis product analysis, it may be concluded that the hydrolysis of N-(benzenesulfonyl)-C-(N-methylanilino)imidoyl chlorides proceed through S_N1 mechanism via azocarbonium ion intermediate below pH 9.0, while above pH 10.0 the hydrolysis proceeds through nucleophilic addition-elimination (Ad_N-E) mechanism.

전자상거래를 통한 구매시 시장지향성이 서비스품질과 만족에 미치는 영향에 관한 연구

권태윤,박성규 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(A)

Effective to attain the purpose of this study, tested the data collected by survey. The results are following: first, in the relationship of market orientation and service quality, market orientation represented significantly on the tangibles, responsiveness, reliability, assurance and empathy. Second, in the relationship of service quality and customer performance, the results showed that tangibles, responsiveness, reliability, and empathy had impacts on the satisfaction, but assurance didn't support the relationship of satisfaction. So the hypothesis 2 was partially accepted. Limitations and Implications for future research are presented in the last paragraph in this study.

전자상거래를 이용한 관광산업의 활성화 방안

권태윤,박성규 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.4 No.1

As the growth of the electronic commerce(EC) and the world wide web(WWW) is continued, internet-based electronic commerce is getting a continuous attention. This paper discusses on the impact of electronic commerce related the tourist industry. The authors anticipate that changes in the travel distribution process brought about by the electronic commerce and other information technologies will result in travel agencies experiencing lower business profitability. Based on this background, the paper further suggests improving plans that could be undertaken to address the situation.