• 한국응용과학기술학회지
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• 제27권4호
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• pp.427-436
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• 2010

Much oyster shell is breeding by character and conduct of oyster-industry for a long time among them. An experimental study was carried out to investigate the recycling possibility of waste oyster shells, which induce environmental pollutions by piling up out at the open or the temporary reclamation. The purpose of this study is to develope eco-friendly binder using waste oyster shells, and to reinforce soils fur soft soil improvement. In this paper, a series of laboratory tests including compressive pot tests were performed to evaluate characteristics of soils treated by developed waste oyster shells with different water content of soils. Based on test results, eco-friendly Supporter manufactured from waste oyster shells were estimated as good resource materials for soft soil improvements. We got the conclusion by a series of experiment, It is verified that change of pH of soil is improved by mixing with oyster shells. The homogenization method for deducing apparent of oyster shells, which can consider micro-structure of mixed soil, is introduced. The improvement treatment leaded to enlarge fluctuation of soil moisture content. The effect of calcium concentration was good though improvement treatment of physical property. In addition, the crop yield in amelioration plots increased. It means that the increase of crop yield was caused by improvement of soil physical properties rather than improvement of calcium concentration.

• 한국응용곤충학회지
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• 제31권4호
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• pp.536-542
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• 1992

비 이앙직전 carbofuran 토양혼화처리의 본논초기 발생해충 방제효과 및 비래성 해충인 벼멸구에 대한 약효지속효과를 조사하여 다음과 같은 결과를 얻었다. 포장에서 5월 하순 이앙직전 carbofuran 토양혼화처리는 6월 중순 carfuran 수면시용처리나 diazinon (3G) +BPMC (50% EC) 2회처리보다 본논초기 발생해충인 애멸구, 끝동매미충, 이화명나방 1화기에 대한 방제효과가 우수하였다. 폿트에서 carfuran 토양혼화처리의 벼멸구 암컷성충에 대한 직접살충효과는 약처리 1개월후에 50%정도로 떨어졌으나 그의 차세대에 대한 밀도억제효과는 약처리 37일후까지 90%이상, 46일후에도 70%정도를 유지하였다. 따라서 이상의 결과로부터 이앙직전 carfuran 토양혼화처리는 본논초기 발생해충 전반에 대한 효과적인 방제수단이 될 수 있으며 6월중 비래하는 벼멸구에 대해서 90%이상 그리고 7월 초순에 비래하는 벼멸구에 대해서도 어느정도의 밀도 억제효과를 발휘할 수 있을 것으로 생각된다.

• 한국자원식물학회지
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• 제17권1호
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• pp.28-33
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• 2004

본 연구는 개량 포플러 현사시 3호를 재료로 제초제 저항성 유전자 PAT으로 형질전환시 킨 다음 제초제 Basta처리에 의한 효율적인 형질전환체 선발을 목적으로 시험되었다. Basta 처리에 따른 캘러스유도, 부정아유도 및 액아유도 시험을 통해 조직치사 농도는 1.0mg/L로 결정할 수 있었으며, 이 농도처리에 의해 형질전환체의 조기선발에 사용하였다. 이 농도처리로 비형질전환체는 모두 고사되었지만, 형질전환체는 정상적으로 반응을 보이며, 생육이 가능하였다 .한편, 형질전환체에 제초제를 직접 살포한 결과, 정상적 생육이 가능했고, PAT activity측정 결과에서도 양성 반응을 나타내어 현사시 3호 세포내에 PAT유전자가 정상 발현됨이 확인되었다. 이로써 현사시에 PAT유전자 도입 및 발현을 위하여 제초제 Basta 처 리와 PAT assay가 매우 효과적인 것으로 나타났다.

• 농업과학연구
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• 제47권3호
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• pp.625-632
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• 2020

This test was conducted to determine the appropriate conditions of temperature, storage period, and soil moisture content when using cold storage of potted mother plants of as a means of sufficient dormant breaking and safe overwintering of the strawberry (Fragaria × ananassa Duch. cv. Sulhyang) mother plants. In the treatment by temperature for the dormant breaking of strawberry mother plants, the survival rate of natural overwintering was 91%, whereas the survival rate was 100% at 0, - 2, and - 5℃. As the storage temperature was decreased, the plant height of the mother plants became shorter which tended to decrease after planting. Survival of the mother plants was possible at - 5℃, but after planting, the growth and number of daughter plants decreased significantly. The number of daughter plants was highest at 22.8 per plant at - 2℃ storage. The strawberry mother plants could be stored for up to 8 months in cold storage. However, when the mother plants were stored for a long period, the number of daughter plants was small. When they were stored for 4 months, the growth of the mother plants was vigorous, and the number of runners and daughter plants was high. When the water content of the soil was less than 10 percent (%, w/w) in the cold storage of the pot, the survival rate was 85 percent, which was high due to the dryness. The survival rate was 100 percent at 30 and above, and the growth of the mother plants after planting and the number of daughter plants were high at 30 to 50.

• 대한화학회지
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• 제35권1호
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• pp.90-95
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• 1991

할로벤질 할라이드의 선택적 카르보닐화에 대한 방법을 검토하였다. 알킬(알콕시메틸)벤조에이트는 한 반응기에서 두 반응에 의해 완성되며, 일차로 알코올 용매하에서 알콕시 음이온을 할로벤질 할라이드와 반응시키면, 알킬 할로벤질 에테르가 Williamson ether 합성법에 의해 얻어진다. 이차로 Na$_2$CO$_3$, CH$_3$I 및 Co$_2$(CO)$_8$을 첨가하고, 일산화탄소 기류하에서 반응시키면, 알릴할라이드 부분이 카르보닐화되어 알킬(알콕시메틸)벤조에이트를 높은 수득률로 얻을 수 있었다.

• 한국자원식물학회지
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• 제25권5호
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• pp.586-590
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• 2012

본 연구는 다양하게 재배되고 있는 강활의 육묘이식 재배방법 중 추대억제에 효과적이면서 고품질의 약재생산이 가능한 육묘이식 방법을 구명하고자 수행하였다. 강활 재배에서 추대억제 및 고품질의 한약재 생산을 위하여 육묘이식 재배방법에 따른 수량 및 성분함량을 비교 분석한 결과는 다음과 같다. 지상부 생육은 야생종근이식과 노지육묘이식재배가 양호하였고 다음으로 트레이육묘이식, 직파재배 순이었으며, 추대는 직파와 트레이육묘 이식재배에서는 나타나지 않았고, 야생종근이식재배와 노지육묘이식재배가 각각 11.4%, 19.7%의 추대율이 나타났다. 수량은 트레이육묘 이식재배가 426 kg/10a로 가장 높았고, 직파재배가 187 kg/10a로 가장 낮았다. 강활근의 주요 성분은 oxypeucedanin, bisabolangelone이었고, 처리별 함량에서는 야생종근 이식재배가 전반적으로 다른 처리에 비해 낮게 나타났다.

• Wind and Structures
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• 제19권4호
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• pp.421-441
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• 2014

With the assistance of typhoon field data at aerial elevation level observed by meteorological satellites and wind velocity and direction records nearby the ground gathered in Guangzhou Weather Station between 1985 and 2001, some key wind field parameters under typhoon climate in Guangzhou region were calibrated based on Monte-Carlo stochastic algorithm and Meng's typhoon numerical model. By using Peak Over Threshold method (POT) and Generalized Pareto Distribution (GPD), Wind field characteristics during typhoons for various return periods in several typical engineering fields were predicted, showing that some distribution rules in relation to gradient height of atmosphere boundary layer, power-law component of wind profile, gust factor and extreme wind velocity at 1-3s time interval are obviously different from corresponding items in Chinese wind load Codes. In order to evaluate the influence of typhoon field parameters on long-span flexible bridges, 1:100 reduced-scale wind field of type B terrain was reillustrated under typhoon and normal conditions utilizing passive turbulence generators in TJ-3 wind tunnel, and wind-induced performance tests of aero-elastic model of long-span Guangzhou Xinguang arch bridge were carried out as well. Furthermore, aerodynamic admittance function about lattice cross section in mid-span arch lib under the condition of higher turbulence intensity of typhoon field was identified via using high-frequency force-measured balance. Based on identified aerodynamic admittance expressions, Wind-induced stochastic vibration of Xinguang arch bridge under typhoon and normal climates was calculated and compared, considering structural geometrical non-linearity, stochastic wind attack angle effects, etc. Thus, the aerodynamic response characteristics under typhoon and normal conditions can be illustrated and checked, which are of satisfactory response results for different oncoming wind velocities with resemblance to those wind tunnel testing data under the two types of climate modes.

• 한국재료학회지
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• 제31권5호
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• pp.286-295
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• 2021

This study attempts to find optimal conditions of the friction coefficient using a discrete element method (DEM) simulation with various friction coefficient conditions and three different grinding media with various ball sizes in a traditional ball mill (TBM). Using ball motion of the DEM simulation are obtained using the optimal friction coefficient compared with actual motion; photographs are taken by the digital camera and the snapshot images are analyzed. In the simulation, the rotation speed of the mill, the materials and velocity of the grinding media, and the friction coefficient between the balls and the wall of the pot are fixed as the actual experimental conditions. We observe the velocity according to the friction coefficient from the DEM simulation. The friction coefficient is found to increase with the velocity. Milling experiments using a traditional ball mill with the same experimental conditions as those of the DEM simulation are conducted to verify the simulated results. In addition, particle morphology change of copper powder is investigated and analyzed using scanning electron microscopy (SEM) for the milling experiment.

• 수산해양기술연구
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• 제55권1호
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• pp.74-81
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• 2019

According to the recent presentation by the Korean Maritime Safety Tribunal, about 70% of marine accident occurs from fishing vessel, and 90% of cause of entire marine accidents attributes to human error. As fishing vessels require basic operations, fishing operations, other additional operations and techniques such as fish handling, cultivating excellent marine officer to prevent marine accident and develop industry is very important. A fisheries training ship is still very difficult to satisfy the demand for diversity of fishery training and sense of realism of the industry. As the result of employment expectation by category of business survey targeting 266 marine industry high school graduates who hope to board fishing vessels for the last four years, tuna purse seine was the highest with 132 cadets (49.6%), followed by offshore large purse seine (65 cadets, 22.4%), and tuna long line (35 cadets, 13.2%). The Korea Institute of Maritime and Fisheries Technology (KIMFT) has replaced old jigging and fish pot fishery training ships and proceeded developing and building multi-purpose fisheries training ships considering the demand of industry and the promotion of employment; however, the basic fishing method was set for a tuna purse seine. As a result of seakeeping model test, it can conduct the satisfiable operation at sea state 5, and survive at sea state 8.

• 한국콘텐츠학회논문지
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• 제20권12호
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• pp.671-680
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• 2020

오늘날 새로운 콘텐츠의 공예품을 개발하는 단계에서 트렌드(Trend)를 반영하지 않으면 마케팅에 성공할 수 없다. 트렌드는 일시적으로 왔다가 사라지는 소비자들의 니즈(needs)를 이끄는 원동력이기 때문이다. 현재의 시장은 끊임없이 변화하며 새로운 라이프 스타일의 독특한 추세를 원하고 있다. 이러한 잠재적 욕구의 경향을 떡살문양과 도자단지를 이용하여 부가 가치가 높은 인테리어 화병을 개발하는 것이 목적이다. 제작 방법은 첫 번째 떡살문 도구를 옹기 작업과정에 쓰인 토레미판 (덧살 새롭게 만든 용어)위에 각도를 다르게 하여 압인한다. 두 번째 물레로 원통을 만들어 외벽에 이중으로 덧살을 붙인 후 빠르게 회전하여 손으로 안에서 밖으로 밀어서 확장시킨다. 세 번째 압인 된 정적인 떡살 문양들을 빠른 속도에 의해 상하-좌우 해체 된 다양한 기하학적 문양을 실험하고 이렇게 개발 된 다양한 떡살 문양들을 단지 형태에 활용하여 부가가치가 높은 장식용 화병을 개발하는 것이 목적이다.