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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
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.
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.
나노 구조가 형성된 열전달 표면에서의 임계 열유속 증진 메커니즘
김동억(Dong Eok Kim) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.7
나노 구조가 형성된 열전달 표면에서 유체의 비등 시 임계 열유속 값이 나노 구조가 없는 표면보다 현저히 증가한다는 것은 잘 알려진 사실이다. 다수의 물리적 메커니즘들이 이러한 나노 구조에서의 임계 열유속 증진 현상을 설명하기 위해 제안되어 왔다. 하지만 지금까지 대부분의 연구들은 정성적인 결과를 제시해 왔으며, 이러한 현상을 일반적으로 설명할 수 있는 이론은 아직 확립되지 않았다. 본 연구에서는 나노 구조가 형성된 표면에서의 임계 열유속 증진에 관한 정량적인 메커니즘을 증기 반동력 및 표면 접착력에 기초하여 제안하고자 한다. 특히, 본 연구에서는 임계 열유속 증진 현상을 표면에 형성된 나노 구조로 인한 액체, 증기, 고체의 삼중선 길이의 증가 및 나노 구조와 액체 사이의 접착력에 근거하여 설명하였다. The critical heat flux (CHF) on a heat transfer surface with nanostructures is known to be significantly better than that on flat surfaces. Several physical mechanisms have been proposed to explain this phenomenon. However, almost all studies conducted so far have been qualitative, and a generalized theory has not yet been established. In this study, we developed a quantitative mechanism for CHF enhancement on a surface with nanostructures, based on vapor recoil and surface adhesion forces. We focused on the increase in the length of the triple contact line owing to the formation of nanostructures and the adhesion force between them and the liquid.
응급의학과 전공의의 brain CT 판독에 인공지능 알고리즘 기반 진단보조솔루션을 적용한 시도
김동억 ( Dong Eok Kim ),서영우 ( Young Woo Seo ),고승현 ( Seung Hyun Ko ) 대한응급의학회 2024 대한응급의학회지 Vol.35 No.2
Objective: This study examined the efficacy of artificial intelligence (AI) algorithm-based diagnostic assistant solutions in the interpretation of brain computed tomography (CT) by emergency medicine (EM) residents. Methods: This study included 350 patients who visited a local emergency medical center over 5 months and underwent brain CT scans. EM residents initially interpreted the patients’ scans. A second interpretation was performed using an AI algorithm-based solution. The initial and second interpretations were compared with that of a radiology physician. Results: The first interpretation by EM residents showed agreement in 318 cases (90.9%), while the second, assisted by an AI algorithm-based solution, showed agreement in 308 cases (88.0%). The first interpretation had an accuracy, sensitivity, and specificity of 93.1%, 43.9%, and 99.7%, respectively, and the second had an accuracy, sensitivity, and specificity of 92.0%, 39.0%, and 99.0%, respectively (P<0.001). Most of the discrepancies observed in the first and second interpretations were classified as Grade 1. Conclusion: The interpretations assisted by the AI algorithm-based solution resulted in lower accuracy and higher discrepancy rates than independent interpretations by EM residents. The AI algorithm-based solution provided efficacy in accurate interpretation depending on the cases. Further study will be needed to address the weaknesses of the function and utility of AI.