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노지고추에서 고추역병 경감을 위한 녹비작물 호밀의 재배효과
권오훈 ( Kwon Oh-hun ),김찬용 ( Kim Chan-yong ),김영숙 ( Kim Young-suk ),원종건 ( Won Jong-gun ),정희영 ( Jung Hee-young ) 한국유기농업학회 2020 韓國有機農業學會誌 Vol.28 No.4
This study was carried out to evaluate the effect of rye as green manure crop on the improvement of soil environment and reduction of Phytophthora blight in red pepper of open field where Phytophthora blight occurred frequently. Soil physical properties such as bulk density and porosity were increased in rye cultivation. In addition, gaseous was increased but liquid was decreased compared with conventional cultivation. The analysis of phospholipid fatty acids extracted from soil showed that rye cultivation significantly increased relative abundance of microbial community and ratio of aerobic to anaerobic bacteria. Furthermore, ratio of saturated to unsaturated fatty acids and cyclo-fatty acids to precursor. the indicators of increasing in environmental stresses, were reduced in rye cultivated field. Occurrence of Phytophthora blight in rye cultivation was reduced 30.7% compared with conventional cultivation. These results suggest that rye cultivation in red pepper of open field where Phytophthora blight occurred can improve soil environment and reduce damage of Phytophthora blight.
다구찌 방법을 이용한 신발 아웃솔 펠레타이징 기계 절단부의 강건설계
권오훈 ( Kwon Oh-hun ),구평회 ( Koo Pyung-hoi ),권혁무 ( Kwon Hyuck-moo ) 한국품질경영학회 2016 품질경영학회지 Vol.44 No.4
Purpose: This study attempts to find out the optimum condition of the rotary cutter making pellet in the footwear outsole process. The pellets are used in the process of outsole rubber fabrication to reduce cycle time and save raw material. Methods: Computer simulations are used to analyze the maximum stress in the rotary cutter after designing a variety of cutter shapes. Taguchi method is used to identify the robust condition of the cutter. In L<sub>18</sub> orthogo-nal array, the control factors such as knife width, twisted angle, number of knives, diameter, knife depth and supported angle are considered and noise factors like assembly tolerance and amount of antifriction are allocated. Results: It is found that the most important factors to reduce maximum stress in the cutter are supported angle and diameter. Using Tacuchi`s results, we can reduce 70% cycle time and 9% raw material compared to the traditional method using cutting die. Conclusion: When designing the rotary cutter, the best conditions are the diameter at its maximum allowable value and supported angle in the boundary of machine inner space.