• 한국습지학회지
• /
• 제21권spc호
• /
• pp.28-38
• /
• 2019

한반도의 기후변화는 전 세계 평균보다도 빠르게 진행되고 있다. 최근 빈발하고 있는 태풍 및 극한 강우, 폭설과 한파, 온난화 현상 등이 그 예이다. 특히 북한지역은 오랜 식량난과 에너지난 그리고 무분별한 산림벌목과 개발로 인해 산림생태계가 훼손되어 홍수 및 이수와 같은 기후변화 관련 자연재해에 매우 취약하다. 또한 북한지역은 정치적·사회적인 영향으로 미계측 지역으로 분류되어 있어 수문분석에 필요한 충분한 수문자료를 구하기 어려운 지역이다. 또한 기후변화에 대한 관심이 높아 지면서 각종 수리시설물 및 재해대책에 기후변화를 고려한 연구가 한반도를 대상으로 활발히 진행되고 있지만 북한을 대상으로 수행된 연구사례는 극히 드물다. 따라서 본 연구에서는 관측 수문자료를 획득하기 어려운 북한지역을 대상으로 지역화 모형을 적용기 위해 획득하기 쉬운 유역특성변수를 선정하고 남한의 16개 댐 유역의 기상학적, 지형적 특성을 기반으로 매개 변수 추정식을 산정하였다. 그리고 오십천, 강릉남대천, 남강댐, 영강유역에 적용하여 산정된 매개변수 추정식의 적용성을 검토한 결과 북한지역에 매개변수 추정식의 적용성이 매우 높을 것으로 판단되었다.

• 한국작물학회지
• /
• 제42권5호
• /
• pp.604-608
• /
• 1997

수원 작물시험장 등 전국 각도 9개 지역에서 1990 및 1991년에 걸쳐 수행된 콩 지방적응연락시험에서, 팔달콩 등 10개의 공시계통들의 평균 수량을 조사하였으며, 수량안정성을 여러가지 방법으로 분석하여 상호 비교하였다. 수량 안정성분석은 Francis와 Kannenberg의 coefficient of variability, Finlay와 Wilkinson의 regression coefficient, Eberhart와 Russell의 deviation parameter, Plaisted의 variance component, Wricke의 ecovalence등 5개 분석방법을 이용하였으며 그 결과를 요약하면 다음과 같다. 1. 분산성분 비교에 의하면, 수량에 대한 콩유전자와 지역간 상호작용 분산성분이 콩유전자 및 년차간 상호작용 분산성분보다 약 7배 높아서, 정확한 수량안정도 평가를 위해서는 여러 해 걸쳐서 콩계통을 평가하기보다는 더 많은 지역에서 평가되어야 할 것으로 보였다. 2. 2년차 9개지역에서 수원 14005('92년 태광콩으로 장려품종 지정)가 평균수량이 높았으며, 5개 안정성 분석결과 수량안정도도 높았다. 3. 안정도계수 종류들 간의 rank correlation 분석결과, Eberhart와 Russell, Plaisted, 그리고 Wricke의 방법들 간의 고도의 유의적인 상관관계가 있었으나, Francis와 Finlay 방법은 다른 분석방법들과는 상관관계가 인정되지 않았다.

• 한국주거학회논문집
• /
• 제23권5호
• /
• pp.75-86
• /
• 2012

The primary purpose of this study is to prove the relationship between housing environment and mental health with depression and self-esteem in the republic of Korea. The raw data of 10,608 respondents, was gathered from the 4th wave of Korea Welfare Panel Study (KoWePS) in 2009. Some variables related to housing environment and mental health were selected in KoWePS' data. Data was analyzed by SPSS 19.0 and AMOS 17.0. The major results are as follow: 1) Householder economic variables significantly relate to housing environment and resident mental health. 2) Housing environment variables are significantly related to resident mental health, and these variables explain 4.3% of depression and 6.7% of self-esteem. 3) Throughout path analysis of economic, housing environment, and mental health variables, housing environment variable is a parameter. In conclusion, these results show that better quality of housing environment would contribute to the residents' better mental health.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제16권6호
• /
• pp.106-112
• /
• 2011

This study developed preliminary assessment methodology for priority listing of soil and groundwater contamination sources, considering source characteristics, local environments and risk receptors. Source characteristics were evaluated by scoring relative risk of contamination sources. Local environments were evaluated by scoring annual rainfall, hydraulic conductivity of aquifer, and annual groundwater use. Risk receptors were evaluated by scoring local population, direct distance to surface water, direct distance to drinking-water wells. Scores of each parameter were allocated by analysing distribution of parameter values obtained from government databases. Distributed scores of source characteristics local environments: risk receptors were 12 : 12 : 12. The preliminary assessment scored 0 to 36 for each soil and groundwater sources. Inventory of soil and groundwater sources consisted of 7 categories. This study applied the preliminary assessment methodology to Manan-Gu, Anyang City, Korea. The number of car repair and washing facility was the largest in the contamination source inventory. Petroleum storage facilities showed the highest assessment score. The preliminary assessment methodology also indicated that Anyang-Dong was the priority section among Anyang-Dong, Suksu-Dong, Bakdal-Dong. This study is the first trial for relative ranking soil and groundwater contamination sources by considering source and local characteristics. Therefore, further researches and revision of the preliminary assessment methodology need to be pursued for various applications.

• 한국물환경학회지
• /
• 제25권4호
• /
• pp.539-546
• /
• 2009

We examined the effects of land cover types on water quality based on data surveyed during April 2007-February 2008 from 178 sites of 111 streams in Paldang watershed. BOD, COD, DO, SS, T-N, and T-P concentrations of spring and summer were strongly and significantly associated with the first principal component of the proportions of eight land cover types, and differences between all parameter's concentration except SS and T-N of spring and summer were insignificantly related with them. SS and T-N concentration of summer were significantly correlated with increase and decrease of stream flow. T-P concentration of spring was the most significantly related with the second principal component which was positively correlated with the proportions of residential and forest land covers and was negatively correlated with the proportions of paddy and grass land covers. It is necessary to manage land use of the upper watershed and stream flow for improvement in water quality because seasonal variations of each water quality parameter are dependent upon land cover and flow variations.

• 한국인터넷방송통신학회논문지
• /
• 제14권4호
• /
• pp.107-112
• /
• 2014

본 연구에서는 다중 사용자 환경의 볼륨 가시화(Volume Rendering)에서 변환 함수(Transfer Function)의 최적화 방안을 연구한다. 볼륨 데이터에 따라 필요한 변환 함수의 형태가 다르기 때문에 여러 번의 시행착오를 겪어야 필요한 변환 함수를 얻을 수 있는데, 이를 방지하기 위해 크라우드 소싱 기법을 이용하여 변환 함수의 파라미터를 최적화 하는 방안을 제안한다. 다중 사용자 환경에서 각 사용자마다 신뢰도에 따른 레벨을 지정하여 가중치로 사용한다. 이전 사용자가 사용했던 변환 함수 파라미터는 가중치만큼 다음 사용자에게 제공되기 때문에 다음 사용자는 변환 함수의 최적 파라미터를 찾기 위한 시도횟수를 줄일 수 있다.

• 임산에너지
• /
• 제18권2호
• /
• pp.84-91
• /
• 1999

The objective of this study was to present creep and the effects of mechano-sorptive deflection of drift pin moment resisting joint between LVL members under changing relative humidity (RH) conditions. The LVL members with steel gusset were jointed by a square pattern of eight injected drift pin. Three diameter drift pins were used to test specimens (6mm, 10mm, and 16mm). The creep test was conducted under two constant loading conditions : one at 30 kgf(840 kgf-cm) and the other at 60 kgf(1680 kgf-cm). The experiment was conducted in an open shed outside. (1)The total rotation creep model of moment resisting joing can be expressed as the sum of the creep of controlled environment (3-parameter model), dimensional change and mechano-sorptive deflection resulting from the variable environment. (2)Mechanosorptive rotation creep is recoverable as moisture content increases during adsorption. Least squares method for linear regression analysis was performed using mechano-sorptive rotation creep as the dependent variable and moisture content as the independent variable. The slope of low moment specimens are compared with those of high moment. This means that low moment condition is more easily affected by changes in humidity than high moment conditions. (3)Although creep deflection is higher for small diameter drift pin than for large diameter drift pin, the shape of creep deflection curves for all specimens is similar.

• 한국물환경학회지
• /
• 제23권3호
• /
• pp.309-313
• /
• 2007

In Activated Sludge Model, COD fraction of primary settled municipal wastewater was a very important parameter. In this study, the COD fraction was determined using the oxygen utilization rate experiments. Readily biodegradable COD ($S_S$) fraction was observed about 29.7% of influent TCOD. $S_I$, $X_I$, and $X_S$ were analyzed to be 7.6%, 7.3%, and 55.4% of TCOD, respectively. The model used in this study was developed based on ASM3 and modified Bio-P module in order to simulate the existing BNR process. Parameter estimation results showed that $Y_{STO,O2}$, $Y_{STO,NO}$, $Y_{H,O2}$, $Y_{H,NO}$, $Y_{PO4}$, ${\mu}_H$, $b_H$, ${\mu}_A$, $q_{PHA}$, $q_{PP}$ and ${\mu}_{PAO}$ were 0.7, 0.64, 0.61, 0.48, 0.31, 3.9, 0.1, 1.35, 4.98, 1.8 and 0.59, respectively. Using the presented model and the estimated parameters, the simulation of the existing BNR process was successfully conducted.

• 한국물환경학회지
• /
• 제28권1호
• /
• pp.109-114
• /
• 2012

In this study, both sedimentation and thickening experiments were conducted for residuals produced from an advanced water treatment plant for more accurate and practical design of residual treatment train. In order to design a backwashed residual sedimentation basin (SRSB) in the filter backwash water recycle system, two kinds of backwash waters, one from sand filter (SFBW) and the other from GAC adsorption bed (GACBW), were separately collected and their surface loading rate measured. In addition, in order to design a gravity thickener, batch thickening tests were conducted for concentrated residuals taken from sedimentation basin and their limiting solid flux ($SF_{L}$) measured. From the experimental results and consideration of the seasonal characteristics of the residual, surface loading rate of $70m^{3}/m^{2}{\cdot}d$ was proposed as a design parameter for SRSB and solid loading rate of 20 kg $TS/m^{2}{\cdot}d$ was proposed as a design parameter for gravity thickeners. Finally, the material mass-balance was made for the design of each unit process in the residual treatment train.

• 한국물환경학회지
• /
• 제29권2호
• /
• pp.165-169
• /
• 2013

Freshwater fish intake is a critical parameter for deriving water quality criteria and water quality standards for protection of human health based on human health risk assessment. Although the freshwater fish intake parameter should be accurate and representative of Korean fish consumption for the water quality criteria to be reliable, data are limited in Korea and have low reliability. In this study, Korean National Health and Nutrition Examination Survey data from 2008-2010 were analyzed to reevaluate freshwater fish consumption. Based on these results, an average consumption rate of 3.0 g/day per person, a $90^{th}$ percentile consumption rate of 0.0 g/day per person, an average consumption rate of 65.7 g/day per fish consumer, and a $90^{th}$ percentile consumption rate of 153.4 g/day per fish consumer were proposed for derivation of water quality criteria using a conservative approach and various exposure scenarios.