• 한국농림기상학회지
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• 제9권3호
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• pp.209-215
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• 2007

2004년부터 2005년까지 복잡 지형에 위치한 나주 지역 배 과수원에 대하여 광역적 기후 지형 모형을 적용, 일 최저 기온의 공간분포를 정밀 추정함으로써 서리 경고 시스템의 정확성을 향상시키고자 하였다. 2004년 봄, 세 곳의 배 과수원에 대해 모형을 적용한 결과, 관측값과 일치함을 보여 주었고 예측력은 기상청 예측 결과보다 더 향상되었다. 실측과 모형에 의한 일 최저 기온의 차이는 골짜기에서 $-2.1{\sim}+2.7^{\circ}C$(평균 $-0.4^{\circ}C$), 강변에서 $-1.6{\sim}+2.7^{\circ}C$(평균 $-0.4^{\circ}C$), 구릉지에서 $-1.1{\sim}+3.5^{\circ}C$(평균 $0.6^{\circ}C$)였다. 냉기침강 효과가 크고 서리 내습 가능성이 높은 골짜기와 강변의 오차가 크게 줄어들었다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.172.2-172.2
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• 2010

This study was carried out in order to reduce the installation expense of heating system for greenhouse comparing to geothermal heat pump and develope the coefficient of performance (COP) for a heat pump. For getting plenty of heat flux from geothermal energy. Surface water in river channel was used for getting a lots of geothermal heat by penetrating water through underground soil layer of the river bank that make heat transmission to passing water. The range of water temperature after the process of Ground filtration is 13~18 degrees celsius which is very similar to low heat source of geothermal heat pump system and the plenty amount of heat source from that make the number of geothermal heat exchanging hole and the expense for geothermal heat exchanger construction reduced. Drainage well is also used for returning filtration water to the aquifer that keep the water good recirculation from losing geothermal heat and water resource. For the COP improvement of Heat pump, thermal storage tank with separating insulation plate according to the temperature difference make the COP of Heat pump that is similar to thermal storage tank with diffuser. Developed thermal storage tank make construction expense cheaper than customarily used one's. and that sand filter and oxidation sand (FELOX) are going to be used for improving ground filtration water quality that make heat exchanger efficiency better. All above developed component skill are going to be set on the Ground filtration water source heat pump system and applied for medium, large scale for protected greenhouse in riverside area and on-site experiment is going to do for optimizing the heating system function and overcome the problem happening in the process of on-site application afterward.

• 산업기술연구
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• 제25권B호
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• pp.63-71
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• 2005

This paper is an experimental result of investigating lateral soil movements at piled bridge abutments by using the centrifuge model facility. Three different centrifuge model experiments, changing the methods of ground improvement at bridge abutment on the soft clayey soil (no improvement, preconsolidation and plastic board drains (PBD), sand compaction pile (SCP) + PBD), were carried out to figure out which method is the most appropriate for resisting against the lateral soil movements. In the centrifuge modelling, construction process in field was reconstructed as close as possible. Displacements of abutment model, ground movement, vertical earth pressure, cone resistance after soil improvement and distribution of water content were monitored during and after centrifuge model tests. As results of centrifuge model experiments, preconsolidation method with PBD was found to be the most effective against the lateral soil movement by analyzing results about displacements of abutment model, ground movement and cone resistance. Increase of shear strength by preconsolidation method resulted in increasing the resistance against lateral soil movement effectively although SCP could mobilize the resistance against lateral soil movement. It was also found that installment with PBD beneath the backfill of bridge abutment induced effective drainage of excess pore water pressure during the consolidation by embanking at the back of the abutment and resulted in increasing the shear strength of clay soil foundation and eventually increasing the resistance of lateral soil movement against piles of bridge abutment.

• 수산해양기술연구
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• 제7권1호
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• pp.1-8
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• 1971

The forth dye diffusion experiment, which was authorized by the Office of Atomic Energy, and some physical aspect of oceanographic observations were carried out in the sea off Kori in September 29-October 1, 1971. In a series of drift bottle experiments the 337 bottles were released. And bottom topography by echo soundings in the survey was well approached to the chart No. 433, Kori and Approaches, published by Hydrographic Office in October 1970. Results deduced from this survey were as follows: 1. A small ridge extends from Kori-Mal tip in southwestward over 1300 meters, and eastside of which is plain and a little sloping while westside of which cliffy and very steeper sloping. 2. A gyre was formed in the waters from Kori-Mal to Mat-dum in cum sole definitely at flood tide and in contra solem less definitely at ebb tide. And that the gyre rose and decayed with the turn of the tide. 3. Diffusion coefficients of 2.5% Rhodamine B solution of 200 liters were 9. 3 ${\times}{10^2}$ c$m^2$/sec in the waters Kori-Mal to Mat-dum and 28.6${\times}{10^2}$ c$m^2$/sec in the waters eastside of Mat-dum at the time after 26 minutes from releasing of the dye solution. 4. According to the above results the eastside of Mat-dum is rather recommendable to settle as the point for the outlet of drainage or waste of atomic power plant to be constructed.

• 한국토양비료학회지
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• 제28권4호
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• pp.327-333
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• 1995

슬러시 처리구에서 수수와 1수립수의 증가에 기인하여 현미수량이 청도 10%, 진주 15%, 여천 7% 증가하였다. 슬러지 처리구에서 현미증 규산의 함량이 높았다. 벼 재배시 레미콘 슬러지를 34.8톤/ha 수준에서 처리하면 토양의 pH상승효과가 크고, 석회자원과 칼리공급원으로서의 이용 가능성이 큼을 알 수 있었다. 그러나 여천의 간척지 토양에 슬러지를 시용할 경우 pH 7.2 이상으로 알칼리 반응을 나타내고 토양의 고상율을 증가시키므로 레미콘 슬러지의 사용에 신중을 기해야 할 것으로 판단된다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회 논문집
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• pp.1031-1035
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• 2005

조력발전 건설사업에서 우선적으로 고려되어야 할 사항은 조수간만에 의해 외해부와 조지부 사이를 이동하는 해수를 적절히 소통시키는 것이다. 즉, 조력발전소에서 수문구조물의 목적은 주어진 조건 하에서 계획된 유량을 충분히 그리고 안전하게 배제시키는 것이다. 본 연구에서는 수문구조물에 대한 Apron의 길이와 경사의 변화에 의한 외해 조위와 시화호 수위차 조건에 따른 유량계수를 구해 배수능력과 유$\cdot$출입부, 외해, 시화호 및 큰가리섬 주위의 흐름 특성을 검토하고자 하였다. 이를 위해 시화호를 실험대상으로 하여 구조물을 중심으로 외해측으로 1,000m, 시화호측으로 500m, 폭 1,500m의 범위를 선정하였다. 수리모형을 1대50의 축척비로 제작하였다. 표 1은 실험별 Apron과 수문구조물의 제원을 나타내며, 수문구조물은 7기로 이루어졌다. 시화호의 흐름은 관성력과 중력이 지배력이 되며, 이때 상사법칙은 Froude 상사법칙을 적용할 수 있다. 실험III은 실험II에서 Apron의 경사를 1대10에서 1대5로 수정한 실험으로 수위조건은 외해측 -2.530 EL.m이고, 시화호측은 -1.603EL.m이다. 유량계수를 산정하기 위하여 6개 실험조건을 기본계획에서 제시된 수위-조위 조건에서 수위차 및 통수유량을 분배하여 결정하였고 유량계수 산정식에 따라 구조물의 유입부와 유출부에서 유속-면적법에 의해서 유량을 측정하였다. 그리고 국부평면 실험모형에서의 전체적인 해류의 흐름을 분석하기 위해 2차원 유속을 측정하였다. 또한, 유$\cdot$출입부 안정성을 검토하기 위해 Apron 지점과 수문구조물 지점에 3점법으로 유속을 측정하였으며, 색소를 이용하여 유황을 관찰하였다. 시화호와 외해의 수위차가 1.011 m일 때의 전체 수문구조물을 통과하는 유량을 비교한 결과, 실험II 및 실험III의 통과유량은 각각 $10,924m^3/s$ 및 $10,075m^3/s$로서 실험 I의 $2,757m^3/s$에 비해 통수능이 많이 개선되었음을 알 수 있다.

• Asian-Australasian Journal of Animal Sciences
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• 제8권1호
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• pp.1-6
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• 1995

This study represented an endeavor to observe clinical signs and pathological lesions in broiler chicks suffering from experimental Infectious stunting syndrome(ISS). One hundred and twenty day old broiler chicks were divide randomly into two equal groups i.e. control (A) and inoculated (B). At day one of age each chick of the groups (A and B) was dosed with one ml of either tryptose phosphate broth or prepared inoculum respectively. Chicks of both the groups were housed separately under similar standard management. Inoculation induced characteristic clinical changes in birds of treatment group like of brownish diarrhea, lameness, feather developing problems and paleness of combs, wattles and shanks. By day-29 of the experiment all the stunted birds from group-B and an equal number of birds from group-A were slaughtered. These birds were examined thoroughly to record the gross changes in various structures and then the severely affected organs were processed for histopathological examination. The skeletons of affected birds were brittle, keel bones showed quite prominence while the muscles and subcutaneous tissues were almost devoid of fat. Grossly it was observed that pancreas, spleen and bursa of Fabricius were severely atrophied while the intestines were ballooned with undigested feed and gases. Histopathological examination of pancreas and spleen revealed a classical picture necessary for understanding the pathogenesis of the syndrome. The acivar cells of pancreas were atrophied and underwent vacuolation, degeneration and vecrosis. The zymogen granules were almost absent from the acinar cells. A characteristic change was an inflammatory reaction in one or more pancreatic ducts where the epithelium and fibrous tissues occluded the lumen of the ducts and led to the obstruction in pancreatic drainage.

• 상하수도학회지
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• 제31권6호
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• pp.567-575
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• 2017

It is not cost effective to raise the density of catch basins in preparation for heavy rainfall in terms of construction and maintenance. Our researchers have developed the new catch basin for increasing interception capacity of runoff with internal filtration structure. To compare interception capacity of an existing catch basin with the invented catch basin, a hydraulic experiment device with 4% of road gradients and 0.2% of road gradients was constructed. For runoff conditions of 4.4 l/s, 6.7 l/s and 10.4 l/s, capability of runoff and separation capability of debris (sand and leaves) were evaluated. As the main experimental results, the effectiveness of the developed catch basin has been verified with an increase in interception rate of approximately 22% for the runoff of 6.7 l/s as heavy rainfall. However, the results of invented catch basin showed only 4.5% of settlement rate of debris regarding sand. Therefore, the authors proposed an improved tilted screen structure additionally. After reviewing the performance of improved catch basin, application of the invented catch basin is expected to drain runoff effectively when it is applied to the faulty road drainage section.

• 한국방재학회 논문집
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• 제10권6호
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• pp.147-154
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• 2010

본 연구에서는 침투형 우수유출저감시설 중 침투트렌치에 대한 치수효과를 25 cm 관경을 가진 트렌치를 사용하여 수위별(5, 10, 15, 20, 25 cm) 유입유량을 적용하여 실험하였고 침투량, 유출량, 유출 시작시간, 종기침투능 및 종기침투능에 도달하는 시간 등을 계측하여 실험을 통한 침투트렌치의 적용방안을 도출하고자 하였다. 침투트렌치의 규모는 배수구역을 $130m^2$($6.5\;m{\times}20\;m$)로 가정하여 유역면적에 대한 CN값으로 산정하였으며 AMC-I 조건에서 5개의 침투트렌치 수위에 대한 CN은 트렌치경사 2%일 때 84, 경사 5%일 때 83으로 산정되었고, AMC-III 조건에서 CN은 트렌치 경사 2%, 5% 모두 84로 산정되었다.

• 한국조경학회지
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• 제33권2호
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• pp.32-47
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• 2005

This study was carried out to investigate and propose a green-wall system with evergreen plants for urban greening of Tongyeong City. To achieve these goals, the requirements and possibilities for wall greening were investigated and evaluated considering the location, topography, and climate of Tongyeong City. Existing walls were analyzed and then a suitable green wall system is proposed. Tongyeong City and its 151 islands covers the central and the southern parts of the Goseong peninsula. Most of the land is covered with hills and mountains; $43.9\%$ of the land area has a slope greater than $15\%$ and most hills and mountains near the urban area have a slope of more than $30\%$. As a result of the topographical properties, concrete retaining walls can often be seen along the streets in urbanized areas. These retaining walls are not only unattractive, but they also create environmental problems, and thus should be replaced with native evergreen plants. Options for replacing the retaining walls include evergreen vine-plants such as Hedaa spp. and Euonymus radicans, but native evergreen shrubs such as Pittosporum tobira, Nandina domestica, Raphiolepis umbellata, Ilex cornuta, flex crenata, Fatsia japonic, and Aucuba japonica may be a more attractive option. Current wall conditions are unsuitable for planting vines, therefore, a reservoir-drainage-type plant box filled with a light artificial substrate is required for greening these concrete retaining walls. These might be irrigated in the dry season and fertilized annually by an appropriate system. These plant boxes could be attached along the entire walls. An experiment investigating effects of substrates and bark-chip mulching on the growth of Hedera spp. showed that the mixture of cerasoil and field soil(v/v, 4:6) was superior to field soil alone and to the mixture of perlite small grain, large grain, and field soil(v/v/v, 2:2:6). Bark-chip mulching tended to increase the growth of Hedera spp..