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.

β-d-glucopyranose에 대한 순이론적 연구: 4C1chairform

양지현, 안익성, 민병진 배재대학교 자연과학연구소 2013 自然科學論文集 Vol.24 No.1

In this study, we have investigated potential energies of β-D glucopyranose in vacuum using QM and MM methods. In QM calculation, the local minimum geometries have been optimized in the level of B3LYP/6-311++G**. And we use AMBER package program and GLYCAM_06 force field for MM optimization. As a consequence, we confirm that GLYCAM_06 force field matched QM calculation roughly.

다수 케이블요소를 사용한 사장교의 횡방향진동을 포함한 비선형 해석

성익현,윤기용 한국강구조학회 2000 韓國鋼構造學會誌 Vol.12 No.6

재생굵은골재를 사용한 콘크리트의 동결융해 특성

성찬용,윤준노,김영익,임상혁,정덕현 충남대학교 농업과학연구소 2003 농업과학연구 Vol.30 No.2

이 연구는 플라이 애시를 결합재 중량의 20%, 재생굵은골재를 천연쇄석굵은 골재의 0%, 25%, 50%, 75%, 100%를 치환하여 압축강도와 동결융해 특성을 구명하였으며, 이 연구를 통해 얻어진 결과를 요약하면 다음과 같다. 1. 재령 28일의 압축강도는 모든 배합비와 W/B 35%에서 400㎏f/㎠이상으로 나타나 고강도콘크리트에 이용될 수 있을 것으로 생각된다. 2. 중량감소율은 동결융해 300사이클에서 1%미만으로 나타났고, 표면박리와 같은 현상은 나타나지 않았으며, 재생골재의 대체율이 증가할수록 감소율은 증가하였다. 3. 초음파진동속도는 동결융해 300사이클에서 19~24%정도의 감소율을 나타내었으며, 재생골재의 대체율이 증가할수록 감소율은 증가하는 경향을 나타내었다. 4. 상대동탄성계슈는 재생골재의 대체율에 따라 60~72%의 범위로 나타내었으며, 재생골재 대체율이 증가할수록 감소하는 경향을 나타내었다. 5. 내구성지수는 모든 배합에서 60이상을 나타내었으나, 재생골재 대체율이 100%일때는 급격히 떨어지는 경향을 나타내었다. 6. 재생굵은골재를 사용한 콘크리트의 압축강도, 중량감소율, 초음파진동속도, 상대동탄성계수, 내구성지수 시험결과를 볼 때, 시험에 사용한 재생굵은 골재는 고강도콘크리트에 사용이 가능할 것으로 판단된다. This study was performed to examine the freezing and thawing properties of the high strength concrete using recycled coarse aggregate. The recycled coarse aggregate was replaced by 0%, 25%, 50%, 75% and 100% of natural crushed aggregate. The compressive strength of the concrete used recycled coarse aggregate was shown in more than 400kgf/㎤ at the curing age 28 days. The weight loss ratio by freezing and thawing was shown in less than 1% at all mix type. The pulse velocity and relative dynamic modulus were decreased with increasing the freezing and thawing cycles. Also, durability factor for the freezing and thawing were decreased with increasing the content of recycled coarse aggregate. But, recycled concrete replaced with recycled coarse aggregate 100% was shown in more than 60 by durability factor in freezing and thawing of 300cycles Accordingly, these recycled coarse aggregate can be used for high strength concrete.

만성두통 환자의 성격유형 A 행태, 스트레스, 우울 및 두통영향정도의 관계 연구

차남현,임사비나,정인태,김수영,안경애,김건식,이재동,이상훈,최도영,이윤호,이두익 EAST-WEST MEDICAL RESEARCH INSTITUTE KYUNG HEE UNI 2005 東西醫學硏究所 論文集 Vol.2005 No.-

To examine an estimate factor and grasp the relation of difference for Ype A Behavior Pattern(TABP), Perceived Stress Questionnaire. Depression and HIT-6 in the Chronic headache client. Method: Data collected by self-reported questionnaires from 38 client in S city who were selected by criteria of IHS, from the 19^(th) of October to 10^(th) of December, 2004. Result: 1) Differences between biographical data by TABP was significant by SaSang constitutions, by Stress was significantly influenced by age, and by Depression were significantly influenced health status and SaSang constitutions. 2) Correlations Coefficients among Study Variables were Stress and Depression(r=.494, p=.002) and Depression and HIT-6(r=.432, p=.010). 3) In regression analysis, HIT-6 were significantly influenced by Depression and Type A Behavior Pattern(TABP). These variables explained 38% and 34% respectively. Conclusion: The result suggest that chronic headache management with psychological aspect, as well as physical aspect should be a focus to enhance the quality of life.

기초과학 실험에 관한 학습자료 개발 : 4·5·6학년 새 자연과 교육 과정 4th·5th·6th grade new elementary school science curri culum

오상철,김영호,현종익 濟州敎育大學 科學敎育硏究所 1983 科學敎育硏究誌 Vol.7 No.-

This is a study to develop the obervations and experimental materials for the elementary school 4th.5th.6th grade science curriculum that are carried on effect from this year. The materials which teachers do and the teachers and students can make, by themselves, are as follows: 1) In the field of biology for 4th.5th and 6th grade, 11 kinds of plant observating materials were cultivated. 2) In physics field of sixth units in the text book for 4th.5th and 6th grade, 10 kinds of implements were developed: electric circuit, moving of heat, expansion of heat and body, solute, movement of Earth and Moon, eaergy of Water and Wind.

봉독약침이 류마티스 관절염 환자의 관절 통증, 종창 및 급성 염증 반응에 미치는 영향

이상훈,이현종,백용현,김수영,박재경,홍승재,양형인,김건식,이재동,최도영,이두익,이윤호 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2003 東西醫學硏究所 論文集 Vol.2003 No.-

Objective In order to study the effects of bee venom(BV) on the pain, edema, and acute inflammatory reactant of rheumatoid arthritis(RA) patients. Methods Patients with RA who met the ACR(American College of Rheumatology) 1987 revised criteria for the diagnosis of RA were treated with the BV therapy twice a week for 3 months. Tender Joint counts, swollen joint counts, Visual analog scale(VAS), morning stiffness, ESR. C-reactive protein(CRP) were analyzed before and after BV therapy. Results The results as follows. 1. Tender joint counts in patients after BV therapy were significantly lower than those before BV therapy(9.0±7.9 vs 15± 11.4, p=0.002). 2. Swollen joint counts of the patients after BV therapy were significantly lower than those before BV therapy(50±61 vs 15±23, p=0.001). 3. VAS in patients after BV therapy was significantly lower than those before BV therapy(608± 17.6 vs 380± 159, p=0.000). 4. Duration of morning stiffness in patients after BV therapy was significantly reduced compared with that before BV therapy(119.1± 112.6 min vs 59.0±89.7 min, p=0.009). 5. ESR and CRP were not significantly changed before and after BV therapy, suggesting BV itself could make inflammatory reaction as well as therapeutic effect. Conclusions BV therapy improved tender joint counts, swollen joint counts and duration of morning stiffness in this study, and further study is needed on long-term effect of BV therapy.

초중고등학교 행정관리 시스템 설계 및 구축 사례 Easy_SRP System v1.0의 기능

최성,최장의,김승찬,김호성,이종욱,최현식,오영갑 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-

현재 초· 중 · 고등학교(이하 ' 학교기관' )에서 산이고 있는 기존의 수작업 방식의 회계관리와 DOS 방식의 행정전산관리 프로그램의 한계점을 벗어나 새로운 GUI 원도우 체계의 프로그램의 개발 필요성이 대두되어 본 시스템을 개발 하게 되었다.또한 학교기관에 납입해야 할 모든 납부금, 급식비, 장부관리에서부터 수입, 지출 등 학교에서 쓰이는 회계부분의 수작업을 모듈화 및 집약화 하고 누구나 쉽게 운영할 수 있는 행정관리 시스템, 일괄처리로 구성하도록 하였으며, DB를 이중모드(사용자 모드와 관리자모드)로 분리, 보안문제를 보충하고, 문서의 표준화로 정보교류의 용이하다.전국 학교기관의 회계운영방식을 표준화하여 구축 설계하고, 초보자 입장을 지향한 순차적 처리방식과 회계관리의 중복처리를 집약화 하여 구축하였다.

Mica에 대한 이산화티탄의 흡착에 관한 연구

강익균,한상현,김용권 慶熙大學校 1984 論文集 Vol.13 No.-

Titanium oxide was prepared by the hydrolysis of TiCl_4 and was coated on mica. The optical characteristics such as reflection and transmission of the latter was studied. The effects of concentrations of TiCl_4 on the rate of hydrolysis, particle size of hydrolysis product (Ti0_2), and crystal induction time, were found to be quite reverse to the general principle. Graphical analysises show that the crystal induction time was shorter as the concentra-tion of TiCl_4 decreased. By proper regulation of the condition of hydrolysis of TiCl_4 solution, mica pigments of colours ranging from silver-white to red was produced. Their maximum intensity of light reflection and maximum transmittance were from 300 to 800nm and from 400 to 700nm respectively.

産業社會의 學生問題와 指導方案 : 韓國産業化 段階의 表象的 課題와 學生指導方案

金益鉉,李達錫,吳成東,曹正基 조선대학교 학생지도연구소 1987 生活指導硏究 Vol.9 No.-