• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.02a
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• pp.57-62
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• 2003

우리나라의 농용트랙터 농가 보급률은 2000년 현재 13.9%로 약 19만대 정도이며 연간 약 2만대 정도의 농용 트랙터가 보급되고 있다. 농작업 중 가장 동력이 크게 소요되는 경운작업은 1차 경기작업과 2차 쇄토작업으로 크게 나눌 수 있는데 근래에는 이것을 동시에 작업화하여 작업시간과 에너지 및 경비를 절감할 수 있는 로타리 경운작업만 실시하는 경향으로 발전하고 있다. (중략)

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1993.11a
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• pp.82-87
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• 1993

산업폐기물 소각시스템으로 현재 널리 이용되고 있는 대형 로타리 킬른형 소각로를 모델로 선정하여 소각로 설계에 필요한 제반변수에 대한 영향을 슈퍼컴퓨터를 이용하여 분석하였다. 화염억제 작용이 있으며 소각처리시 유독물질을 배출하는 $CCl_4$를 폐기물로 주입하는 경우 비평형 난류반응모델을 도입하여 반응장 해석을 한 결과 실험결과와 정성적으로 일치된 결과를 얻을 수 있었다.

• Cement
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• s.78
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• pp.19-24
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• 1980

• Cement
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• s.63
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• pp.4-14
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• 1976

• The Korea Swine Journal
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• v.15 no.8 s.168
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• pp.106-108
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• 1993

• Journal of the Korean Geosynthetics Society
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• v.15 no.1
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• pp.37-46
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• 2016

Rotary pile consists a single or multiple helix plate and it is installed into the ground using the rotation of the helix plate. Rotary pile in soft ground is able to be supported by pile shaft and helix plate. When the pile is installed into hard layer relatively, the end bearing capacity is possible to be increased by the lower helix plate. In this paper, small-size rotary piles were manufactured with using steel pipe which is reduced to 1/5 size of the rotary pile on the construction field. Pile load test was carried out on the foundation soil which was formed by weathered soft soil. The bearing capacity of small-scale piles depends on the number of helix plate, the length of plate diameter, and an interval of plates, respectively. The bearing capacity of pile increases about 40% with 3 helix plate and it is also confirmed that the bearing capacity is improved about 10% as the increment of plate interval.

• Korean Journal of Soil Science and Fertilizer
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• v.41 no.5
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• pp.285-292
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• 2008

To investigate the effect of tillage methods on the silage barely growth and the soil environment in paddy field, liquid pig manure(LPM) was applied after harvesting rice at Jisan series soil for 2 years. Five plots, a LPM applied rate as N%; 0, 100, 150, 200(basal dressing) and 100(basal dressing)+50(additional fertilizer) were divided by tillage methods; non-tillage, non-tillage+rice straw and rotary tillage method. Emission amounts of $NH_3$ gas highly decreased in the rotary tillage and the non-tillage+rice straw plot compared to non-tillage plot. The contents of soil organic matter and exchangeable cation were increased in the applied LPM plot. $NH_4-N$ and $NO_3-N$ contents in soil were the highest in the non-tillage+rice straw plot and followed by the rotary tillage and highly decreased along with the growth of plant. Run-off rate of mineral components were higher in order of the rotary tillage plot£æthe non-tillage plot£æthe non-tillage+rice straw plot and then leached to $SO_4$, $NO_3-N$, K plentifully. The yield of silage barley in dry weight was higher in order of the non-tillage+rice straw plot>the rotary tillage plot>the non-tillage plot. To estimate the feed value of silage barley, crude protein, acid detergent fiber(ADF) and neutral detergent fiber(NDF) contents were analyzed. Crude protein and ADF contents were the highest at rotary tillage N150% plot as 9.7 and 29.4%, respectively. NDF contents was the highest at non-tillage+rice straw N150% plot as 56.7%. In conclusion, we recommend not to incinerate rice straw and to apply LPM at non-tillage status in cultivating the silage barley. This may prevent water pollution and increase barley yields.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.76-76
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• 2017

4륜 승용관리기는 보통 후방이나 전방에 작업기를 장착하여 작업하나 3륜 승용관리기는 작업기를 복부에 장착함으로 작업의 정밀도, 편이성, 관측의 용이성 향상과 함께 지상고 제고, 차폭 조절, 조향 등의 성능 개선을 기할 수 있다. 국내에서는 3륜 승용관리기용 복부 장착 부속작업기가 거의 개발되어 있지 않으며, 특히 두류 재배에 있어서 일관기계화 작업을 위한 관리작업기의 개발이 매우 필요한 실정이다. 승용관리기의 중경배토기에 의한 작업은 기존 인력에 의한 작업보다 약 87%의 노력을 절감할 수 있으며, 잡초방제 효과도 인력에 비하여 크게 떨어지지 않고, 수량도 증가하는 것으로 보고되고 있다. 따라서 본 연구는 3륜 승용관리기에 적합한 복부장착형의 중경배토기를 설계 제작하였다. 3륜 승용관리기용 중경배토기는 승용관리기의 복부 PTO에서의 구동력 전달을 위한 연결 조인트, 중간축, 기어 및 체인 전동기구, 구동축으로 구성된 동력전달부, 4개의 로타리 날과 후방 1개의 배토날로 구성된 3조의 작업날, 로타리 날과 배토날의 경심 조절을 위한 3조의 바퀴, 흙의 비산 방지를 위한 로타리날 커버 및 케이스, 다양한 조간거리에 적응을 위한 조간조정 나사부, 3륜 승용관리기에의 부착을 위한 프레임 및 부착보조 작업기 이동용 바퀴장치 등으로 구성 설계 제작하였다. 로타리 날과 배토날은 기존 시판 관리기용 날을 사용하였다. 로타리 날은 진행방향으로 회전하도록 하였으며, 날의 회전반경은 약 330 mm, 조당 경운 폭은 약 230 mm 설계하였다. 최대 경심은 100 mm이며, 조간거리의 조절범위는 수동 나사에 의하여 620~900 mm 범위로 무단조절 할 수 있도록 하였다. 중경제초기는 3륜 승용 관리기 복부의 평행링크에 부착되므로 작업기의 이동 및 부착 편이를 위하여 이동용 바퀴를 설치하였다. 제작된 중경배토기의 크기는 길이${\times}$폭${\times}$높이가 $660{\times}2072{\times}880mm$, 중량은 약 200 kg으로 제작되었다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.24 no.3
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• pp.35-42
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• 1979

Experiments were conducted to find out the labor saving efficiency and optimum seeding rate and fertilizer level when newly invented Barley Rotor Caster was used in wheat sowing on paddy field. It decreased the labor for sowing by 66~77% compared with conventional sowing method. And the optimum. seeding rate was considered to be approximately 20$\ell$Q per 10a in standard fertilizer level and optimum fertilizer level to be 18-12-12kg/10a, $N-P_2O_5-K_2O$ respectively.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.52 no.2
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• pp.204-207
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• 2007

This study was conducted to suggest proper water management practices after and before broadcasting of rice seed on flooded paddy surface at reclaimed saline soil with two different saline levels in Gyehwado Substation of Honam Agricultural Research Institute (HARI) NICS, RDA for two years from 2004 to 2005. The stable seedling stand in low saline soil of 0.1% salinity was obtained by one time of water exchange after soil rotary Whereas in medium saline soilof 0.3% salinity, three times of water exchange was required for the stable seedling stand. Milled rice yield was not affected by frequency of water exchange in low saline soil, while it decreased sharply in one and two times of water exchange compared with three times of water exchange in medium saline soil. Irrigation water immediately after direct seeding increased the number of seeding stand in low saline soil. With the increase in the interval of water exchange after direct seeding, the milled rice yield decreased. Although the continuous water flowing showed the most number of seedling stand and was increased milled rice yield compared with the others interval of water exchange in medium saline soil, the number of seedling stand and milled rice wasn't significantly different up to exchange of two days interval compared with the continuous water flowing.