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RISS 인기검색어
- 검색키워드
- 저자 : 키라가샤픽 ( Shafik Kiraga ) (검색결과 2 건)
- 무료
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구란다즈아스라푸자만 ( Ashrafuzzaman Gulandaz ),레자나심 ( Nasim Reza ),초두리밀론 ( Milon Chowdhury ),키라가샤픽 ( Shafik Kiraga ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.2
Humidity control inside greenhouses is essential for optimum plant growth and physiological disorders and diseases managements. The humidity response and variability depend extensively on the performance of the dehumidifier. The objective of this research was to evaluate the performance of a small-sized suspension-type dehumidifier in terms of temperature and humidity changes and spatial and vertical variability in a greenhouse. The dehumidifier consisted of a 0.6 kW compressor and a 0.1 kW fan. We compared the performance of dehumidifier among the different installation layouts like one at the center, two at the center (facing opposite directions from the center to the sides), one at either of the sides, two at both of the sides (facing to the center). To evaluate the functional ability of the dehumidifier, 45 temperature and humidity sensors were placed at three layers (top, middle, and bottom) and in five sections for monitoring the environmental status inside the greenhouse. Two additional sensors were placed in front of the dehumidifier and outside of the greenhouse. A wireless sensor network was used to collect the data for 90% to 70% dehumidifier operating conditions and monitor the humidity status during the operation and collected the data. The humidity response results showed that the time required for 90% to 70% dehumidification were 33 minutes. Temperature fluctuates 1degree after 11 minutes in upper layer and 27 minutes in bottom layer. The spatial and variability results indicated that the changes in humidity at, two at the center (facing opposite directions from the center to the sides) were higher than those in the other setup of dehumidifier in greenhouse. The outcomes of this research will be helpful for the development of low-power, small-sized dehumidifying systems and its setup position in greenhouse for cultivation.
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알리모하마드 ( Mohammod Ali ),레자나심 ( Nasim Reza ),초두리밀론 ( Milon Chowdhury ),구란다즈아스라푸자만 ( Ashrafuzzaman Gulandaz ),키라가샤픽 ( Shafik Kiraga ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.2
Multi-purpose platform of a machine performs various agricultural operations that can reduce labor and enhance the convenience of aged people and women. To obtain the maximum working efficiency and reliability of a prototype machine, a field experiment is required. Therefore, the purpose of the study was to evaluate the performance of a electric-drive tracked platform based on the power and pulling force analysis to conduct the major agricultural operations in different load and speed conditions. Grass mowing, and chemical spraying operations were selected as primary agricultural activities to evaluate the performance of the prototype tracked-platform. A data acquisition system was established with a torque sensor and a load cell to measure the maximum torque and pulling force. To record the working speeds of the platform, a global positioning system (GPS) was used. The field experiment was conducted on sandy clay loam soil condition on a 50 m operational path and the maximum speed was recorded up to 8 km/h (1 to 8 km/h). The average power requirements for a whole system (lawnmower + sprayer-trailer), a sprayer-trailer filled with 150 L of water, a lawnmower (without sprayer-trailer), and a platform itself were 1.27±0.35, 1.70±.13, 0.93±0.21, and 1.45±.19 kW, respectively. The maximum pulling force was measured 1.98±1.12, 0.614±0.46, and 19.28±11.32 kgf for hauling the rear trailer at 150L-payload condition, and 0.81±0.60, 0.416±.34, and 4.50±3.88 kgf at the unloaded condition in X, Y, and Z direction, respectively. The highest amount of average power and pulling force were recorded at maximum load condition. The power and pulling force requirements were fluctuated due to the effects of the different driving speeds. This study would help to provide information to the manufacturer for advance modifications of the tracked-platform.
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