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스마트 온실 환경 제어를 통한 사용자 편의성 향상 및 센서 인터페이스 개발을 위한 기초 테스트
산다윙 ( Sandah Wing ),모하마드알리 ( Mohammod Ali ),밀론초두리 ( Milon Chowdhury ),카인미얏트시 ( Khine Myat Swe ),정재혁 ( Jae-hyeok Jeong ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.1
Greenhouse technologies are becoming popular for its crop production capabilities in adverse climatic conditions, however, farmers are still facing difficulties to control the ambient environment due to lower-grade sensor interface. The objective of this study is to do the basic tests of sensors for developing an interface for the user comfort and ease during the ambient environment control of greenhouses. A survey was conducted for selecting the required sensors considering their principles, and specifications. Three kinds of temperature, humidity, and carbon dioxide sensors, two kinds of soil water content sensor, a light intensity sensor, a solar radiation sensor, a rain gauge, a wind speed sensor, and a wind direction sensor are selected for the test. A circuit diagram was designed, and the power input, signal output, and response time of each sensor were checked. Based on the results, additional devices, such as power stabilizer, AD converter, resistor, were selected. The input power fluctuated on an average from 0.05 to 0.5 V, and the relevant signal output voltage varied from 0.1 to 1.2 V. Most of the sensors showed a quick response (i.e., 25μs, 1.25μs, 0.025s, and 0.05s). Results indicate that input power has a great influence on signal output and response time. A power converter could be needed to supply a stable power using a switching diode, resistors and capacitors. The developed sensor interface would be able to measure environmental parameters more accurately using any kind of sensors and increase the ease of users.
카인미얏트시 ( Khine Myat Swe ),밀런초두리 ( Milon Chowdhury ),장보은 ( Bo-eun Jang ),산다윙 ( Sandah Wing ),전현종 ( Hyeon-jong Jun ),이상희 ( Sang-hee Lee ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.2
The objective of the study was to investigate physical and strength properties of radish and Chinese cabbage. Each fifteen pieces of radish and Chinese cabbage were used for the experiment. Mass, diameter, height and cutting diameter were recorded to obtain basic data for the physical quality properties of vegetables by using digital weighting balance, digital calliper and ruler. Universal Testing Machine attached with 500 N loadcell and circular combined blade were also used to measure possible compression force of vegetables. Then the strength was calculated and different results of radish and Chinese cabbage were observed. Average mass, diameter, height of radish and Chinese cabbage were 1.52 and 1.33 kg, 105 and 155 mm, 214 and 312 mm respectively. Stem and root cutting diameter, strength of radish and Chinese cabbage were 49 and 27.36 mm, and 0.02 and 0.15 N/mm2 respectively. These physical properties of the vegetables affect the conveying characteristics of solid materials. The results of the present study provide useful information for the design components of industry.