http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김동억,박노복,홍순중,강동현,우영회,이종원,안율균,한신희,Dong Eok, Kim,Nou Bog, Park,Sun Jung, Hong,Dong Hyeon, Kang,Young Hoe, Woo,Jong Won, Lee,Yul Kyun, Ahn,Shin Hee, Han 국립한국농수산대학교 교육개발센터 2022 현장농업연구지 = Journal of practical agricultural resear Vol.24 No.4
Growing agricultural products in greenhouses controlled by creating suitable climatic conditions and root zone of crop has been an important research and application subject. Appropriate environmental conditions in greenhouse are necessary for optimum plant growth improved crop yields. This study aimed to establish web-based remote monitoring system which monitors crops growth environment and status of crop on a real-time basis by applying to greenhouses IT technology connecting greenhouse equipment such as temperature sensors, soil sensors, crop sensors and camera. The measuring items were air temperature, relative humidity, solar radiation, CO<sub>2</sub> concentration, EC and pH of nutrient solution, medium temperature, EC of medium, water content of medium, leaf temperature, sap flow, stem diameter, fruit diameter, etc. The developed greenhouse monitoring system was composed of the network system, the data collecting device with sensors, and cameras. Remote monitoring system was implemented in a server/client environment. Information on greenhouse environment and crops is stored in a database. Items on growth and environment is extracted from stored information, could be compared and analyzed. So, A integrated monitoring system for smart greenhouse would be use in application practice and understanding the environment and crop growth for smart greenhouse management. sap flow, stem diameter and pant-water relations
논문 : 노외기계시스템공학 ; 소립종자용 평면배열 진공노즐식 반자동 파종기 개발에 관한 연구
김동억 ( Dong Eok Kim ),이공인 ( Gong In Lee ),강동현 ( Dong Hyeon Kang ),김유호 ( You Ho Kim ),이혜진 ( Hye Jin Lee ),김현환 ( Hyeon Hwan Kim ),김종구 ( Jong Ku Kim ),김용현 ( Yong Hyeon Kim ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.6
A large scale seeding system was stable in terms of techniques but a convenient seeding system of small size was unsettled. This study was performed to develop a semi-automatic seeder for small and medium sized scale farm. To investigate optimum needle diameter and vacuum pressure was used vacuum suction needle seeder. Although the needle diameter according to the kinds of seed was different, the needle diameter for salvia and lettuce seed was suitable for 0.34 mm needle nozzle and 0.4 mm taper nozzle. The prototype consisted a seeding frame attached with needle nozzle, seed hopper, vibrating device, seeding part, vacuum ejector, seed tube etc.. As the result with the experiments, the seeding rate of the seeder was 92% and more at 0.34 mm diameter needle nozzle and 0.4 mm taper nozzle. Eccentric weight for seed hopper vibration was suitable that weight is 11 g and eccentric distance is 0.5 mm. Vibration acceleration of upward direction was 0.363 m/s2. Working capacity of the seeder was possible 160 trays per hour. It was possible for sowing small seeds but it was required to make compact and simple model.
김동억(Dong-eok Kim),김봉수(Bong-soo Kim),김현배(Hyun-bae Kim),윤용철(Yong-cheol Yoon),김치호(Chi-ho Kim),김현태(Hyeon-tae Kim) 충남대학교 농업과학연구소 2012 농업과학연구 Vol.39 No.4
The objective of this study is to observe growth pattern of grand rapids(lettuce) according to different experimental conditions for minimizing its growth period such as composition of nutrient, irradiation time of light source and cultivation mode. The culture of water spray type using seeds of grand rapids was performed during growth period of total 50 days. Experimental conditions consist of five compositions of nutrient (PW 0.5 mS/㎝, PW 1.0 mS/㎝, PY 0.5 mS/㎝, PY 1.0 mS/㎝, PW 2.0 mS/㎝) and three irradiation times of light source (12h(on) / 12h(off), 18h(on) / 06h(off), 24h(on) / 00h(off)). Illumination was adjusted to ratio of 7:1:1 of red, blue and white color, respectively. Indoor environmental condition for cultivating grand rapids is as follows: temperature (19-22℃), relative humidity (60-70%) and carbon dioxide (1,000-1,200 ppm). The data were obtained from five iteration tests. The maximum growth level was observed in the experimental condition of 18 hr(on) / 06 hr(off) and PY 1 mS/㎝ for 1st week of cultivation period, 24 hr(on) / 00 hr(off) and PY 1mS/㎝ for 2nd week of cultivation period, and 24 hr(on) / 00hr(off) and PW 1 mS/㎝ for 3rd week of cultivation period, respectively. On the contrary, the minimum growth level was observed in the experimental condition of 18 hr(on) / 06 hr(off) and PW 0.5 mS/cm for 1st week of cultivation period, 12 hr(on) / 12 hr(off) and PW 0.5 mS/㎝ for 2nd week of cultivation period, and 12 hr(on) / 12 hr(off) and PY 0.5 mS/㎝ for 3rd week of cultivation period, respectively. Based on the results obtained from this study, it is concluded that the growth level of grand rapids varied with different irradiation time of light source and composition ratio of nutrient according to cultivation period.
LCL 입력 필터를 갖는 PWM 컨버터의 궤환 선형화 제어
김동억(Dong-Eok Kim),장석호(Suk-Ho Jang),이동춘(Dong-Choon Lee) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 댐핑저항을 사용하지 않고 LCL필터를 사용한 AC/DC PWM 컨버터를 제어하기 위해 다중 구조의 궤환 선형화 제어 알고리즘을 제안한다. 일반 궤환선형화와는 달리 다중구조를 지니므로 컨버터 입력전류의 제한이 가능하다는 장점을 지닌다. 전원전압과 전원전류를 추정하기 위해 추정기가 사용되며 시뮬레이션을 통해 제안된 제어기의 성능이 검증된다.
김동억 ( Dong-eok Kim ),배광수 ( Kwang-soo Bae ),신윤아 ( Youn-ah Shin ),한신희 ( Shin-hee Han ),강동현 ( Dong-hyeon Kang ),우영회 ( Young-hoe Woo ) 한국농업기계학회 2017 한국농업기계학회 학술발표논문집 Vol.22 No.2
적외선을 이용한 열영상은 작물의 환경스트레스 탐색, 기공활력에 따른 생육반응 연구 등을 위한 기술로 자리매김하고 있다. 본 연구는 열영상카메라를 이용하여 토마토묘의 열영상을 획득하고 체온을 분석하여 수분스트레스 추정가능성을 보고자 하였다. 열영상 기술을 적용하여 토마토묘의 일중 엽온 변화를 연속적으로 관찰하였다. 수분스트레스 여부는 엽온과 기온의 차를 통해 비교하였다. 열영상은 열화상카메라(A325sc, FLIR systems USA)이용하여 토마토 육묘트레이 상부에 설치하여 연속적으로 촬영하였으며, 촬영한 영상은 1분 간격으로 노트북에 저장되도록 하였다. 토마토의 잎에 관심영역을 12군데 설정하고 온도변화를 관찰하였다. 기온은 데이터로거(U12-011, Hobo, USA)로 측정하였다. 실험결과, 야간에 기온이 엽온 보다 다소 높은 경향이었으며, 오전에 엽온이 기온보다 높은 지점이 일부 나타나기 시작하였으며, 오후 1시경부터 측정지점의 엽온 평균이 기온 보다 낮았다 높아지기를 반복하다 4시경부터 엽온평균이 기온 보다 낮은 것으로 나타났다. 각 시각별 지점별 기온과 엽온 간의 차는 최소 0.08°C에서 최대 3.6°C의 표준편차를 보였고, 최대 10°C의 온도차이를 보여 접촉 방식에 의한 단순히 몇 지점 만의 온도측정으로는 정확한 스트레스 여부를 판단하기는 다소 어려울 것으로 보인다. 작물체의 엽온은 수분스트레스 뿐만 아니라 일사, 기온, 습도, 풍속, 기공개도 등 여러 요인과 관련이 있다. 따라서 엽온 측정 만으로 수분스트레스를 정확히 진단하는 데는 한계가 있기 때문에 다른 요소도 함께 포함한 연구가 수행되어야 할 것으로 판단된다.