• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 추계학술대회
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• pp.512-513
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• 2017

본 논문에서는 현재 주사바늘을 이용하여 종자를 흡입하고 트레이 상부에서 배기하여 트레이의 셀에 종자를 파종하고 있는 방식의 자동 파종 시스템에 대하여, 작업 능률을 향상시키기 위하여 진공상태의 드럼에 종자를 흡입시켜 회전하면서 트레이에 종자를 배출하게 되는 고속의 시스템을 구현하였다. 트레이를 이송시켜주는 컨베이어 벨트는 상부의 부하의 변화 또는 장치의 마모 등 시간이 지남에 따라 속도가 변할 수 있으므로 속도에 맞추어 드럼의 회전 속도를 자동으로 제어하기 위한 알고리즘을 구현하고 구현된 알고리즘에 따라 드럼을 회전시키기 위한 스테핑 모터의 펄스를 제어하는 회로를 구성하여 시스템을 설계하였다.

• 아시안잔디학회지
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• 제9권3호
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• pp.173-185
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• 1995

Hydroseeding technique is a very popular method of revegetating slope areas through the control of soil erosion and stability by seeding grasses. This study was conducted to select turfgrass species and cultivars for hydroseeding. Experiment plots were established on various soil types and environmental conditions at Singar-Ansan high-way construction site. The investigation was designed in three cutting, one back-filling and other three spare sites with various seed mixtures. Results indicated that combinations of seed mixtures influenced seed germination and rates of surface cover. In a view of long term, vegetation shifts should be influenced by characters of slopes and micro-climate conditions. Hydroseeding did not show good results on rocky slope areas. Revegetation was only going on where there had soil. The combination of seed mixture with a higher rate of perennial ryegrass had relatively good revegetation with faster germination and seedling growth. Improved turf-type tall fescue Arid ⓡ and Falcon ⓡ seemed to have good environ-mental adaptation and drought tolerance. Wild or old type cultivars showed relatively slow green-up in spring and growth rates at the next year of seeding. For the harmonious landscaping with surrounding area, the combination of native grass mixture with cool-season grasses had good results. Slow and low revegetation rate at hack-filling site seemed to be caused by the poor development of capillary tubes in sub-soil. It was shown that a high correlation between seed germination and revegetation rate, and between three-month later coverage rate and final rate. The evaluation of coverage rate after three month seems to he acceptable to decide the accomplishment of hydroseeding results on rode side slopes.

• 한국세라믹학회지
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• 제52권4호
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• pp.273-278
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• 2015

${\alpha}-Al_2O_3$ was synthesized by solvothermal synthesis using ${\alpha}-Al_2O_3$ seed, precursor of fine boehmite (Al(OOH)) or gibbsite ($Al(OH)_3$), and 1, 4-butanediol solvent. The seed content and precursor type were selected as variables in order to synthesize ${\alpha}-Al_2O_3$. The formation time of ${\alpha}-Al_2O_3$ was reduced and the size of the particles was decreased with addition of the seed. When the seed content was increased, the size of the synthesized ${\alpha}-Al_2O_3$ was reduced. Morphologies of the as-synthesized ${\alpha}-Al_2O_3$ with ${\alpha}-Al_2O_3$ seed were polyhedron-shaped, while the shape was plate-like or polyhedral without the seed, depending on the additives or the average particle size of the boehmite precursor. The aggregation of as-synthesized ${\alpha}-Al_2O_3$ from boehmite was smaller than that from gibbsite. As-synthesized ${\alpha}-Al_2O_3$, with 140 nm size, was obtained by using the seed and boehmite precursor.

• 한국연소학회지
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• 제11권3호
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• pp.36-43
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• 2006

The modulated LII technique has been suggested for the measurement of axial velocity profiles of laminar diffusion flames. The theoretical background is explained based on the blackbody radiation and LII signal. Experimentally, soot particles in ethylene diffusion flames are heated by a modulated Ar-ion laser beam. LII signals and their phase angles are measured using a lock-in amplifier at the different flame heights and the axial flow velocities are obtained from the measured phase angle delay informations. The measured velocities are similar to those from LDV measurements under the same operating conditions. The effects of laser power, LII signal wavelength, and modulation frequencies are not sensitive to the velocity measurement. However, the choice of an optical chopper blade type could affect the measurement result. The use of a 6/5 chopper blade showed the better result that is. possibly due to the square shape of modulated laser beam. This study successfully demonstrated that axial flow velocities of laminar diffusion flames can be measured by a new technique utilizing LII signal, which does not need particle seeding unlikely to LDV or PIV techniques.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2006년도 제32회 KOSCO SYMPOSIUM 논문집
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• pp.157-163
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• 2006

A new technique utilizing LII signal for the measurement of flow velocities of laminar diffusion flames has been investigated. Soot particles in ethylene diffusion flames are heated by a modulated Ar-ion laser beam. LII signals and their phase angles are measured using a lock-in amplifier at the different flame heights and the axial flow velocity are obtained from the measured phase angle delay. The measured velocities are similar to those from LDV measurements under the same operating conditions. The effects of laser power, LII signal wavelength, and modulation frequency are not sensitive to the velocity measurement. However, the choice of an optical chopper blade type could affect the measurement result. The use of a 6/5 chopper blade showed the better result that is possibly due to the square shape of modulated laser beam. This study successfully demonstrated that axial flow velocities of laminar diffusion flames can be measured by a new technique utilizing LII signal, which does not need particle seeding unlikely to LDV or PIV techniques.

• Journal of Animal Science and Technology
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• 제60권2호
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• pp.1.1-1.6
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• 2018

Background: Maize fodder is being used as staple feed for livestock but it lacks protein and essential amino acids; lysine and tryptophan. Intercropping maize with leguminous soybean crop is promising technique under limited land resources of South Korea but it can only give considerable advantages when adequate distance is provided between corn and soybean rows. Main aim of present study was to find-out adequate distance between corn and soybean seeding rows for optimum growth, yield and nutritive value of intercropped forage. Methods: Different interrow distances between corn and soybean were evaluated under four treatments, viz. 1) Corn sole as positive control treatment 2) Zero cm between corn and soybean (control); 2) Five cm between corn and soybean; 3) 10 cm between corn and soybean, with three replicates under randomized block design. Results: Findings depicted that height and number of corn stalks and ears were similar (P > 0.05) among different treatments. Numerically average corn ear height was decreased at zero cm distance. Dry matter percentage in all components; corn stalk, corn ear and soybean was also found not different (P > 0.05) but dry matter yield in component of corn ear was lower (P < 0.05) at zero cm distance as compared to that of 5 and 10 cm interrow distances. In case of nutritive value, total digestible nutrient yield in intercropped corn was also found lower (P < 0.05) at zero cm distance than that of 5 and 10 cm interrow distances between corn and soybean seeding rows. Substantial decrease in dry matter yield of maize ear at zero cm distance might be attributed to factor of closed interrow spacing which made interplant competition more intensified for light interception, necessary for photosynthetic activity. Lower dry matter yield in ear also reduced total digestible nutrients in intercropped maize because it was determining factor in calculation of digestible nutrients. The optimum yield and nutritive value of forage at wider interrow distance i.e. 5 cm between corn and soybean might be due to adequate interseed distance. Conclusion: Conclusively, pattern of corn and soybean seeding in rows at 5 cm distance was found suitable which provided adequate interrow distance to maintain enough mutual cooperation and decreased competition between both species for optimum production performance and nutritive value of intercropped forage.

• 한국환경복원기술학회지
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• 제15권4호
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• pp.119-132
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• 2012

The unmanaged abandoned concrete roads are vulnerable toward the issues on soil and water pollution, which requires flexible managing method such as eco-corridor after the process of ecological restoration. Among various alternations of abandoned concrete-paved roads, ecological restoration technique may be the most suitable method in sites including high quality of natural environment. Therefore, as in Young dong province, GyungBu express highway (227.24~229.04km), which is near to Hwang-gan IC, the survey to measure its effect of soil under the paving and water pollution by abandoned concrete roads was discussed. Then, the restoration method of plantings of landscape trees and hydro-seeding methods of artificial soil media was appraised through consecutive monitoring. The soil adequacy analysis shows lower percentage of heavy metal substance in each depth level compared to standard limit stated by the Ministry of Environment, along with low concerns raised after the analysis on heavy metal content of the spilled water on the concrete roads. Meanwhile, Korean Weigela (Weigela subsessilis L.H. Baily) was found to be withered in small-scale landscape trees planting sites. Among the seeding plants. the family of leguminosae, Silene armeria, Dendranthema boreale, Caryopteris incana and Aster yomena show good establishment results. Overall studies on planting of small and large landscape trees, planting method of container plants, planting method of ground cover plants, and germination and development trend of seeding plants of the experimental restoration site on abandoned concrete roads are revealing specific trends in the way landscape woody plants establishment and growth. Finally, this study suggests further studies and survey on varied plant restoration methods on abandoned concrete-roads for developed design guidelines of their methods.

• 한국토양비료학회지
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• 제39권5호
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• pp.298-302
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• 2006

비닐피복작물 재배시 시비효율 증대 및 생력시비기술 확립을 위하여 파종과 동시에 시비가 가능한 토중시비기를 개발하였고 개발된 파종기와 시비기를 이용하여 1999년부터 2000년까지 시비간격 30 cm, 시비깊이 15 cm, 파종간격 25 cm로 배수가 양호한 사양토에서 땅콩을 재배한 후 작업정도, 토양화학성, 양분흡수량 및 수량성에 미치는 영향을 평가하였다. 땅콩의 파종 소요시간은 인력($173hr\;ha^{-1}$)에 비하여 90% 이상 노력절감 효과가 있었으나 출현일수는 4일정도 지연되었으며 입모율은 관행구에 비하여 11~18% 낮았다. 시험 전 토양에 비하여 시험 후 토양의 총질소 함량은 증가한 반면에 유기물, 유효인산 및 치환성 칼륨함량은 감소되었으며 토양의 질산태질소 합량은 생육초기에서 중기까지 국소시비구에서 시비량이 많을수록 증가하였다. 땅콩의 질소흡수량은 근류균에 의한 자체 고정량이 많아 시비방법 및 시비량별 큰 차이가 없었으나 인산 및 칼리흡수량은 국소시비 70%, 100%구에서 높은 경향을 나타냈다. 땅콩의 생장속도는 시비방법별 공히 파종 후 120일에 가장 많이 증가되었고 관행시비구와 국소시비 70%구에서 생육후기까지 증가폭이 크게 나타났으며 국소시비 70%구는 협수가 많고 협실비율 및 완숙립중 비율이 높아 종실중이 관행시비구 $3,150kg\;ha^{-1}$에 비하여 4% 증수되었다.

• 현장농수산연구지
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• 제22권1호
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• pp.43-53
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• 2020

본 연구는 국내 호밀 종자의 자급률을 향상시키기 위해 전북 장수지역에 적합한 종자 채종기술을 개발하고자 2013~2015년까지 3개년에 걸쳐 시험을 실시하였다. 품종은 국내 육성종인 곡우호밀을 사용하였다. 시험구는 파종량 4수준(3, 5, 7, 9 kg/10a), 질소시비량 4수준(0, 3, 6, 9 kg/10a)으로 처리별 단요인 시험을 실시하였다. 시험구배치는 난괴법 3반복으로 하였으며, 생육특성과 종실생산성을 평가하였다. 장수지역에서 호밀 종자의 파종량을 10a당 3 kg으로부터 9 kg으로 증가시킴에 따라 m²당 이삭수·도복이 증가하였으며, 유효경수·임실률·리터중·1000립중 및 종실수량은 감소하였다. 질소 시비량은 10a 당 3 kg으로부터 9 kg으로 증가시킴으로써 m²당 이삭수, 간장, 1수립수, 도복 및 종실수량은 증가하였으며, 1립중 및 리터중은 감소하였다. 따라서 호밀의 종실수량, 파종용 종자 비용과 질소 과잉 시비에 따른 환경오염, 도복 등을 고려할 때 장수지역에서 호밀 종자생산을 위해 적합한 파종량은 10a당 5 kg, 질소 시비량은 10a당 6 kg로 추천되었다.

• 한국석유지질학회:학술대회논문집
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• 한국석유지질학회 1999년도 제6차 학술발표회 발표논문집
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• pp.68-84
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• 1999

자연 미생물 분해 (Biodegradation)는 미생물들이 유출 기름 또는 기타 환경 오염물들을 분해시키는 자연 풍화 과정이며 이를 더욱 가속화시키기 위하여 인공적으로 미생물에 필요한 영양분 공급 또는 미생물들을 추가로 파종하는 것을 미생물 분해법 (Bioremediation)이라고 한다 현재 해상 기름 유출 사고 시 기계적 장비를 이용한 제거방법이 널리 사용되고 있으며 기계적 제거 방법의 대안으로서 화학분산제 (Chemical Dispersants) 사용과 현장 소각 (In-situ Burning) 방법이 있다. 또 하나의 대안으로서 이 미생물 분해법이 지적되고 있으며 충분한 시간이 주어질 때 해안으로 유입되는 기름에 대하여 일부 미생물들을 이용하여 유출 기름을 적어도 부분적으로 제거할 수 있다. 본 논문에서는 해상 유출 기름 제거를 위한 미생물 분해법의 종류와 기술의 잠재력 그리고 적용 시 고려하여야 할 문제점들을 분석하여 발생 가능한 피해를 최소화시키는데 필요한 정보들을 정리하였다.