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하유신(Yu Shin Ha),박경규(Kyung Kyoo Park) 한국초지조사료학회 2012 한국초지조사료학회지 Vol.32 No.1
본 연구는 겨울철과 여름철에 답리작 사료작물의 랩사일리지 생산에서 연구보고된 조사료 재배품종과 재배방법을 기준으로 하였을 때, 소요 기계에 따른 기계화 생산 작업의 특성과 부담면적, 기계 이용비용을 분석하여 조사료 생산비용을 산출하였다. 생산비용은 작물종류(호밀, 청보리, IRG, 수단그라스), 파종방법 (산파, 조파)과 트랙터 마력 (50, 75, 100, 130 ps)에 따른 경작규모별 (부담면적 ha별), 부담면적대비 경작지비율별 (25, 50, 75, 100%), 작부체계별(품종 숙기별, 동·하계 작물별)로 분류하여 산출하였다. 트랙터 100 ps, 조파를 기준으로 단일 품종 재배보다 호밀, IRG와 청보리 등을 품종 숙기별로 재배할 때 파종은 20일에서 30일로, 수확은 약 30일에서 40일로 시기가 늘어나기 때문에 부담면적이 57.1 ha에서 77.5 ha로 증가하였다. 동·하계 작물 연중 재배시 생산비용은 100 ps 트랙터, 조파, kg-TDN 기준으로 호밀 + 수단은 250원, 청보리 + 수단은 215원, IRG + 수단은 234원, 호밀 + 청보리 + IRG+ 수단은 233원으로 나타났다. 이는 연중 재배하지 않는 경우에 비해 고정비가 줄어들기 때문에 생산비용은 약 30~50% 절감되었다. 따라서 답리작 사료작물의 랩사일리지 생산시 노동피크와 수확시기의 분산, 기계장비의 효율성을 제고할 수 있도록 품종 숙기별 연중 재배 작부체계의 이용이 바람직한 것으로 판단되었다. Mechanized operation model and mechanical cultivation technology for winter barley, rye, Italian ryegrass and sudan grass wrap silage production system at the paddy field for cropping system was developed. Also, a series of experiment were performed and lots of data were collected and analyzed to develope mechanical technology, coverage area, and optimum size of the farm (break-even point) for wrap silage production system. The coverage area for winter barley or rye wrap-silage production system is determined around 61.9, 73.4, 77.5, 88.2 ha in the case of drill seeding and different ripening species by tractor power 50, 75, 100, 130 ps, respectably. The break-even point of the farming size is analyzed as 20 ha and its production cost is estimated around 367, 383, 430, 443 won/TDN-㎏ in the case of winter barley wrap-silage by tractor power 50, 75, 100, 130 ps, respectably. The break-even point of the farming size is analyzed as coverage area and its production cost is estimated around 237, 215 won/TDN-㎏ in the case of winter barley wrap silage and sudan grass by the tractor power 50, 100 ps, respectably.
200㎫급 초고강도 콘크리트의 자기수축 특성에 관한 실험적 연구
하정수(Ha Jung-Soo),백민수(Paik Min-Su),손유신(Sohn Yu-Shin),이승훈(Lee Seung-Hoon),이영도(Lee Young-Do),정상진(Jung Sang-Jin) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.8
Low W/B ultra-high strength concrete has low porosity and discontinuous capillary tube in the cement milk. Within a few days after placement, autogenous shrinkage occur because of the quick drying from the self-desiccation. So, the possibility of cracking is higher than the normal strength concrete. In this study, the autogenous shrinkage deformation characteristics of ultra-high strength concrete that are different from the normal strength concrete were examined. A new shrinkage formula is suggested form the experiment data. The conclusion is as follows. 1) The 91days strength of the concrete combination that are W/B 12.5%, normal portland cement 55%, china silica fume 20%, GGBFS-2 20%, anhydrite 5% was the best result, 193.7㎫. So, it is the appropriate combination for the 200㎫ grade ultra-high strength concrete. 2) The autogenous shrinkage deformation of W/B 20% ultra-high strength concrete can be predicted using the suggested shrinkage formula.
200MPa급 초고강도 콘크리트의 자기수축 특성에 관한 실험적 연구
하정수,백민수,손유신,이승훈,이영도,정상진,Ha, Jung-Soo,Paik, Min-Su,Sohn, Yu-Shin,Lee, Seung-Hoon,Lee, Young-Do,Jung, Sang-Jin 대한건축학회 2011 대한건축학회논문집 Vol.27 No.8
Low W/B ultra-high strength concrete has low porosity and discontinuous capillary tube in the cement milk. Within a few days after placement, autogenous shrinkage occur because of the quick drying from the self-desiccation. So, the possibility of cracking is higher than the normal strength concrete. In this study, the autogenous shrinkage deformation characteristics of ultra-high strength concrete that are different from the normal strength concrete were examined. A new shrinkage formula is suggested form the experiment data. The conclusion is as follows. 1) The 91days strength of the concrete combination that are W/B 12.5%, normal portland cement 55%, china silica fume 20%, GGBFS-2 20%, anhydrite 5% was the best result, 193.7MPa. So, it is the appropriate combination for the 200MPa grade ultra-high strength concrete. 2) The autogenous shrinkage deformation of W/B 20% ultra-high strength concrete can be predicted using the suggested shrinkage formula.
Twist Wheel 방식 폐비닐수거기 개발에 관한 연구(Ⅰ)
하유신(Yu-Shin Ha),박규식(Kyu-Sik Park),김진현(Jin-Hyun Kim),최중섭(Jung-Seob Choe),손철민(Chul-Min Son),김태욱(Tae-Wook Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.1
Mulching vinyl is used on field crops to reduce herbicides and this causes multiple effects. The mulching vinyl must be collected for the next crop season, but was left alone due to a shortage of labor. The used mulching vinyl that was left alone acted as one of the main sources of environmental pollution on farms. In order to solve these problems, a self-propelling vinyl remover was developed. The self-propelling vinyl remover consists of a travelling part and rotating of remover wheel. Each output device has a 1.5ps engine and a 2.5ps engine. The vinyl was twisted 17~47㎝/times length. The bobbin’s diameter was 160㎜ and it’s stable travelling speed was 0.5㎧. The revolution of the remover wheel bobbin was 60rpm to maintain the wheel’s linear velocity. As seen at performance test at the field which had 950㎜ ridge intervals and 10a area, the average working speed was 0.56㎧ and the turning time was 15seconds. Therefore, the working performance was 40.1min/10a.
Twist Wheel 방식 폐비닐수거기 개발에 관한 연구(Ⅱ)
하유신(Yu-Shin Ha),박규식(Kyu-Sik Park),김진현(Jin-Hyun Kim),최중섭(Jung-Seob Choe),손철민(Chul-Min Son),남상헌(Sang-Heon Nam),김태욱(Tae-Wook Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
This study consist of two parts. One is development of a self-propelling vinyl remover which was already reported at the previous paper. This is the second part of the study. For the study, an attached vinyl remover was developed. It was consisted of connecting tractor to bucket, removing bucket from tractor, and the process was the tractor"s assistance hydraulics. In the case of an attached vinyl remover, the vinyl was twisted 0.5times per 30∼85cm length. The bobbin"s diameter was 190mm and it"s stable travelling speed was 1m/s. The revolution of the remover wheel was 90rpm to maintain the wheel"s linear velocity. As seen at performance test at the field which had 950mm ridge intervals and 10 a area, the average working speed was 1m/s and the turning time was 20seconds. Therefore, the working performance was 24.5min/10a. The efficiency of used vinyl remover was 97% and working conditions were good.
자주식 동력운반장치를 이용한 농산물 수확ㆍ운반작업의 편이성 및 생산성 분석
하유신(Yu-Shin Ha),손철민(Chul-Min Son),남상헌(Sang-Heon Nam),김진현(Jin-Hyun Kim) 한국산업융합학회 2011 한국산업융합학회 논문집 Vol.14 No.1
This study analyzed the convenience and productivity before and after adopting self-propelled power transportation devices to the harvest and transportation of fruit and vegetable products in the Gyeongbuk region, by applying the REBA and RULA techniques. In the REBA analysis, the work risk was low with 4~6 points before adoption which became 2~3 points after adoption. As for the RULA analysis, work loading appeared to have decreased with 6~7 points before adoption which became 3~4 points after adoption. The annual work time reduction was about 48∼179 hours while labor costs were reduced to 364∼1,345 thousand won annually. This indicated a labor cost reduction effect of about 10∼15%. Therefore, the adopted self-propelled power transportation devices appeared to prevent musculo skeletal diseases of the human body and also improve productivity even after using it for long hours according to the REBA, RULA measures level.
논문 : 농산물,식품가공공학 ; 비닐하우스 내 태양초 생산을 위한 고추 자동 교반장치 개발
하유신 ( Yu Shin Ha ),김기동 ( Ki Dong Kim ),남상헌 ( Sang Heon Nam ),손철민 ( Chul Min Son ),구건효 ( Geon Hyo Koo ),이기명 ( Ki Myung Lee ),황부원 ( Bu Won Hwang ),김진현 ( Jin Hyun Kim ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.6
This study was carried out to test a red pepper tedding factors which is needed for design and development of an auto-tedding machine and a performance. According to this test, the results can be summarized as follows: The results of the tedding factors test according to shape of rotary blade, which is the 0.4 to 0.5 mm brush type, was found to be the most appropriate. As a result of tedding ratio which includes brush diameters, driving velocities and rotation velocities, there was generally no significance difference, but the red pepper tedding efficiency was found to be 39.7%. The moisture drying rate of red pepper was found to be 0.9 %w.b./h in prototype auto-tedding machine and 0.4 %w.b./h in traditional practice. The drying time was found to be 3 days in prototype auto-tedding machine and the traditional practice was 6 days. The average variable coefficient of the red pepper moisture content was found to be 16.8% in prototype auto-tedding machine in comparing with the traditional practice of 35.0%. This test showed a difference around two times, and this difference was evaluated to be the reason for irregular drying and different drying times.
하정수 ( Jung Soo Ha ),백민수 ( Min Su Paik ),이주하 ( Joo Ha Lee ),손유신 ( Yu Shin Sohn ),이승훈 ( Seung Hoon Lee ),정상진 ( Sang Jin Jung ) 한국건축시공학회 2011 한국건축시공학회 학술발표대회 논문집 Vol.11 No.1
In this study, W/B that affect the strength and shrinkage were 4 level(14.5~11.5%), so that the and the physical and shrinkage properties were verified. And the shrinkage formula is suggested at the age of 91. The results showed that the strength of W/B 12.5% was the highest strength. And as W/B decreased, the shrinkage ratio increased. The autogenous shrinkage was rapidly decreased after 28 days.