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- 저자 : Wing Sandah (검색결과 4 건)
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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.
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( Milon Chowdhury ),( Sandah Wing ),( Md. Shaha Nur Kabir ),( Kyu-dong Na ),( Soo-bok Park ),( Sun-ok Chung ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1
Monitoring and controlling of ambient environment plays an important role for quality production in protected crop cultivation facilities. However, malfunctioning of sensors and actuators used for monitoring and control of the ambient environment could interrupt the robustness of the management system. In this research, the malfunctioning of sensors and actuators was detected based on the interaction matrix technique and current consumption rate to increase the effectiveness and ease of protected crop cultivation management. A small-scale smart greenhouse consisted sensors (temperature, humidity, CO2, Light/solar radiation, wind speed and direction, soil water content, current sensors) and actuators (heater, cooler, humidifier, dehumidifier, fan, CO2 controlling device, light source, and water supply unit, window control motor) were used for testing and detecting the malfunctioning of the monitoring and control system. A controlling system consisted of a micro-controller, relays, and a LabVIEW coded program. Functioning status of all sensors and actuators was checked by the current sensor. An interaction matrix-based algorithm was developed for malfunctioning detection. Four fault scenarios such as abrupt, incipient, intermittent, and simultaneous faults were considered in the sensors and actuators. This method was capable to detect 90% of the artificial failure in short computational time, which proved its suitability for real-time applications. This accurate and efficient fault detection technique can be used to improve safety and reliability, especially when the cultivated crops are more valuable and environmentally sensitive.
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Theoretical Analysis of Power Requirement of a Four-Row Tractor-Mounted Chinese Cabbage Collector
Swe Khine Myat,ISLAM MD NAFIUL,Chowdhury Milon,ALI MOHAMMOD,Wing Sandah,전현종,이상희,정선옥,김대건 한국농업기계학회 2021 바이오시스템공학 Vol.46 No.2
Purpose Analysis of power requirement is the key issue to ensure the optimal design. The objectives of the study were to investigate theoretically the tractor hydraulic power and draft power requirement of a tractor-mounted Chinese cabbage collector system and to suggest design guidelines. Methods The major components of the Chinese cabbage collector under development were a belt type conveyor, a hydraulic motor, and three hydraulic cylinders. Hydraulic motor power, cylinder hydraulic power, and draft power for various speeds under unloaded and loaded conditions were calculated using theoretical equations. Different tractor configurations (44~74 kW), soil types (sand, silt, and clay), and hydraulic fluid capacity (1~5m3/hr) were considered to determine the tractor hydraulic power and engine power requirement. Results The power requirement of the hydraulic motor for the unloaded and loaded conditions was 1.14 kW and 1.24 kW, respectively, under the 120-rpm conveyer speed. Hydraulic power of 2 ×10−3 kW was required to fold or unfold the collecting conveyor. The maximum required draft power levels were 0.67, 0.81, 0.94, and 1.21 kW for the hard, firm, tilted, and soft soil conditions, respectively. Based on the results, the total maximum power requirement was calculated as 15.14 kW, of which 7.25 kW is for the hydraulic power (48%) and 7.89 kW for the draft power (52%), respectively. Conclusion The analysis of power requirements presented in this research can help estimate the tractor hydraulic power and draft power requirement to run a tractor-mounted Chinese cabbage collector efficiently.
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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.
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