• 현장농수산연구지
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• 제26권1호
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• pp.16-21
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• 2024

본 연구는 해마다 수입을 많이 해오고 있는 콩과 녹비작물 종자의 발아율을 높이기 위해서 연구되었다. 열탕처리는 콩과 식물에서처럼 두꺼운 종피로 인해 휴면상태에 빠지는 종자의 발아율 향상 및 발아속도 증진을 위해 사용하는 방법이다. 클로버류와 자운영은 열탕처리가 무처리 보다 발아일수와 발아속도가 다소 높았다. 하지만 발아율과 발아세의 경우 무처리가 열탕처리보다 다소 높았지만 유의미한 차이를 보이지 않아 열탕처리가 발아율에 효과가 있다고 판단되지는 않는다. 네마장황의 경우 발아율과 발아속도를 높이는데 있어서는 염수선 처리가 가장 효과가 좋았고, 열탕처리는 초기 발아속도를 높일수는 있지만 발아율을 높이는데는 적합하지 않은 것으로 보였다. 헤어리베치의 경우 수입산 헤어리베치와 국내산 헤어리베치(토익과 청풍보라)에서 열탕처리와 염수선처리는 발아율에는 효과가 없었으나 발아세, 발아속도, 평균발아일수에는 다소 효과가 있다고 판단된다. 따라서 콩과 녹비작물과 같이 두꺼운 종피로 인하여 휴면상태에 빠지는 종자의 경우 발아율 향상과 발아속도를 향상시키기 위해 열탕처리나 염수선처리를 하는 것이 좋을것이라 사료된다.

• 한국토양비료학회지
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• 제19권1호
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• pp.76-82
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• 1986

1. 항온기간중(恒溫期間中) $N_2O$의 경시적(徑時的) 발생량(發生量)은 항온(恒溫) 1일(日)과 10일경(日傾) 그리고 $N_2$의 발생량(發生量)은 1일(日)과 30일경(日傾)에 많았다. 2. 토양유기물함량별(土壤有機物含量別) 탈질량(脫窒量)은 현저(顯著)한 차이(差異)를 보이지 않았으며 시용유기물간(施用有機物間)에는 녹비(綠肥)>볏짚>퇴비(堆肥)>무시용(無施用)의 순서(順序)로 높았다. 3. 질소시비량(窒素施肥量)이 증가(增加)할수록 탈질량(脫窒量)은 증가(增加)되었으나 토양간(土壤間)에는 뚜렷한 차이(差異)가 없었음. 4. 탈질반응속도(脫秩反應速度)(계수(係數))는 토양유기물함량(土壤有機物含量)이 많고 역분해성유기물(易分解性有機物)을 시용(施用)할수록 증가(增加)되었음. 5. 토양중(土壤中) 탄소발생량(炭素發生量)과 탈질량(脫窒量)과의 관계(關係)에서 아산화질소(亞酸化窒素)는 정상관(正相關) 그리고 분자상질소(分子狀窒素)는 부상관관계(負相關關係)를 보였음. 6. 탄소(炭素) 1 mg이 소모(消耗)될때 약 4 mg의 $N_2O$와 3 mg의 $N_2$가 생성되었음.

• Corrosion Science and Technology
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• 제19권5호
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• pp.265-280
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• 2020

External corrosion of buried pipes can be controlled using both coating and cathodic protection. However, deterioration of the coating can occur due to several reasons. The detection reliabilty of coating flaw detection methods is affected by interference such as metal objects connected to rectifiers and copper grids. When performing parallel direct current voltage gradient (DCVG) inspection, a sine wave form without potential reversal in voltage gradient appears in the area where the interference exists. However, this area may be not identified using existing methods. The objective of this study was to determine the effect of analyzing direction on the reliability of coating flaw detection of pipes buried in soil using a multi-electrode detector. DCVG on the buried pipe was measured along the buried pipe. This measurement parallel to the pipe was repeated. Measured data were analyzed for parallel, vertical, and diagonal directions. The reliability of coating flaw detection was improved by up to 46.4% compared to the conventional method.

• 한국건축시공학회지
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• 제16권2호
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• pp.125-131
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• 2016

도심지 건물의 증가는 친환경 공간에 대한 요구를 발생시키고, 이에 따라 옥상 및 인공지반 녹화의 보급이 급속히 증가되고 있다. 본 연구는 녹화시스템의 보급 확대를 위해 공법의 단순화, 일체화, 프리훼브화 개념을 적용, 연속 토양층 형성 박스 유닛형 녹화시스템을 개발하고, 이 시스템의 주요 성능으로 부착성, 내풍성, 단열성을 평가하여 적용 가능성을 검토하였다. 부착성 및 내풍성 시험결과, 설계 풍압 및 풍속과 비교하면 100m 높이의 건물에 설치해도 안전한 것을 확인하였고, 단열성 평가를 위해 120일간 측정한 내부 온도의 변화를 분석한 결과, 개발 시스템이 연속된 토양층을 형성하여 기존 유닛박스 시스템보다 주간은 17%, 야간은 45% 우수한 단열성능을 보여 주었다.

• 한국기후변화학회지
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• 제7권3호
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• pp.351-356
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• 2016

The carbon capture and storage (CCS), which collects and stores carbon dioxide in a geological site, is a promising option to mitigate climate change. However, there is the possibility of carbon dioxide leakage from the soil in the steps of collecting, transporting, and storing. To ensure the feasibility of this technology, it is important to monitor the leakage of carbon dioxide and to assess the potential impacts. As plants are sensitive to the changes in carbon dioxide in the soil environment, we can utilize plant parameter to detect the carbon dioxide leakage. Currently, chlorophyll a content is a conventional index indicating the changes in plants, however, this method is labor intensive and it only utilizes a small portion of leaves. To overcome its limitations, a simple spectroscopic parameter, DGCI (dark green color index), was suggested as an easy and quick indicator. In this study, we compared the values of chlorophyll a contents with DGCI from the experiment investigating the impacts of high underground $CO_2$ on grape plants. Results suggest that DGCI had high correlation with chlorophyll a contents and it has high potential to be utilized as an easy indicator to monitor plants' responses to $CO_2$ treatment.

• 한국농공학회지
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• 제35권3호
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• pp.36-46
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• 1993

The purposes of this study are to develop three-layered Green-Ampt infiltration model considering temporal variation of physical properties of soil and to evaluate the model with field experiment on bare-tilled and soybean-growing soil plots under natural rainfalls. Infiltration tests were conducted on a sandy loam soil. The model has three-layered soil profile including a surface crust, a tilled layer, a subsoil and considers temporal variation of porosity, hydraulic conductivity, capillary pressure head on a tilled layer by natural rainfalls and canopy density variation of crop. Field measurement of porosity, average hydraulic conductivity and average capillary presure head on a tilled layer were conducted by soil sampler and air-entry permeameter at regular intervals-after tillage. It was found that temporal variation of porosity and average hydraulic conductivity might be expressed as a function of cumulative rainfall energy and average capillary pressure head might be expressed as a function of porosity of a tilled soil. The model was calibrated by an optimization technique, Hooke and Jeeves method using hourly surface runoff data. With the calibrated parameters, the model was verified satisfactorily.

• KIEAE Journal
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• 제9권2호
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• pp.65-71
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• 2009

Results from tests for what mixing rate of soil and sand is proper for the rammed earth and for how much additives are optimum are as under. 1) In the test to evaluate what mixing rate of soil and sand is desirable, peptizing property and surface sticking rate are found similar in its degree, but compression strength is found most stable when the ratio of soil and sand mixing shows 30:70 which indicates the best mixing rate of soil and sand. 2) In a test to add hydrated lime, compression strength, peptizing property, and surface sticking rate are found best when the mixing rate of soil and sand shows 23:7. 3) In a test to add sea weeds, the peptizing property goes down at 75% of sea weeds input a little bit more than at 100%, but compression strength shows best at 75% which is thought to be the best rate. 4) In a drop test, more soil powder mixed, the sticking strength gets better and more sands are contained, the sticking strength gets far worse to be scattered in powder type. 5) As concluding all results mentioned in the above item, the most desirable mixing rate of soil, sand, and hydrated lime is found to be 23:7:70 for the rammed earth where compression strength, peptizing property, and surface sticking rate are best.

• Structural Engineering and Mechanics
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• 제58권5호
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• pp.887-903
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• 2016

This study analyses the seismic response of a three-dimensional (3-D) rigid massless square foundation resting or embedded in a viscoelastic soil limited by rigid bedrock. The foundation is subjected to harmonic oblique seismic waves P, SV, SH and R. The key step is the characterization of the soil-foundation interaction by computing the impedance matrix and the input motion matrix. A 3-D frequency boundary element method (BEM) in conjunction with the thin layer method (TLM) is adapted for the seismic analysis of the foundation. The dynamic response of the rigid foundation is solved from the wave equations by taking into account the soil-foundation interaction. The solution is formulated using the frequency BEM with the Green's function obtained from the TLM. This approach has been applied to analyze the effect of soilstructure interaction on the seismic response of the foundation as a function of the kind of incident waves, the angles of incident waves, the wave's frequencies and the embedding of foundation. The parametric results show that the non-vertical incident waves, the embedment of foundation, and the wave's frequencies have important impact on the dynamic response of rigid foundations.

• 한국작물학회지
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• 제46권3호
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• pp.189-194
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• 2001

추파연맥-옥수수 이모작 작부체계에서 헤어리벳치 녹비 이용의 가능성 및 그 효과를 검정하기 위해 1999년 및 2000년의 2년간 작물시험장 발포장에서 옥수수 수확 후 9월 초순 연맥과 헤어리벳치를 혼파하여 11월 초순 일차적으로 사초를 수확하고 난 후 월동한 벳치를 옥수수의 녹비로 이용하였을 때의 효과를 조사하였는데 다음과 같은 결과를 얻었다. 옥수수 단작에서 벳치단파에 따른 옥수수에 대한 2년 평균 벳치녹비량 6.7cm/ha의 효과는 연맥이모작의 옥수수 질소표준비와 거의 동일하였다. 연맥과 혼파시의 벳치의 녹비 및 녹비질소량은 벳치 단파시의 40%에 불과하여 옥수수 6엽기에 조사한 토양질산태 질소량도 벳치-녹비구 및 연맥-표준질소구보다 반 이하로 감소하였고 식물체 질소함량이 많이 감소하여 출사기 옥수수 질소흡수량이 40-50kg/ha 감소하였다. 그러나 옥수수 6엽기에서의 토양질산태 질소가 무질소비료구의 2배 정도였으며 시험 2년차에는 추비질소가 필요없이 토양 질산태 질소수준인 25mg/kg에 거의 접근하였으며, 출사기에서의 옥수수 질소흡수량이 무질소비료구보다 약 30-40kg/ha 증가하였다. 시험 1년차 연맥+베치-녹비구의 옥수수 전건물중은 벳치-녹비구 및 연맥-표준질소구보다 종실중이 다소 감소하여 약 2 ton/ha 정도의 수량 감소가 있었지만 시험 2년차는 동일하였다. 옥수수 1년차에 약 60kg/ha, 2년차에 20kg/ha 감소하였으며, 연맥-무질소구에 비해서는 1년차 30kg/ha, 2년차 45kg/ha 정도 증가하여 질소화학비료 50-100kg/ha 대체효과를 얻을 수 있었으며, 뚜렷한 녹비의 2년 누적효과를 볼 수 있었다. 따라서 옥수수의 단작시의 헤어리벳치녹비보다는 효과가 적지만 연맥 이모작시에도 연맥과의 혼파에 의한 헤어리벳치의 녹비 및 질소비료 절감효과도 충분히 크며 녹비의 누적효과도 기대할 수 있을 것으로 판단되었다.

• 한국환경과학회지
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• 제16권9호
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• pp.1099-1102
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• 2007

This paper presents eco-friendly planting method to overcome the problems of existing concrete retaining wall and gabion retaining wall, respectively, based on the examination on existing concrete and gabion retaining wall. Prior to doing this, proper design method was provided through pull out test. Planting method using gabion metal net and L shape green net retaining wall were compared and analyzed. According to this study, it is confirmed that reduction of construction period and economical profit in construction can be achieved by both manufacturing at the factory and self procurement at the job site as well as the use of metal net, which is applied as a substitution of existing strengthening material. For the effect of planting method, the use of L shape green net retaining wall shows superiority to environment-friendly gabion retaining wall in its ability to rootage and germination of the grass. The L shape green net retaining wall had excellent performance in helping rootage of grass and prevention of soil leakage, and even if raining period, remarkable damage of planting mat does not occur when planting mat is applied.