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논문 : 노외기계시스템공학 ; 초음파센서를 이용한 변량제어 스프레이어
전홍영 ( H. Y. Jeon ),주허핑 ( H. Zhu ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.1
An experimental variable rate nursery sprayer was developed to adjust application rates for canopy volume in real time. The sprayer consisted of two vertical booms integrated with ultrasonic sensors, and variable rate nozzles coupled with pulse width modulation (PMW) based solenoid valves. A custom-designed microcontroller instructed the sensors to detect canopy size and occurrence and then controlled nozzles to achieve variable application rates. A spray delivery system, which consisted of diaphragm pump, pressure regulator and 4-cycle gasoline engine, offered the spray discharge function. Spray delay time, time adjustment in spray trigger for the leading distance of the sensor, was measured with a high-speed camera, and it was from 50 to 140 ms earlier than the desired time (398 ms) at 3.2 km/h under indoor conditions. Consequently, the sprayer triggered 4.5 to 12.5 cm prior to detected targets. Duty cycles of the sprayer were from 20 to 34 ms for senor-to -canopy (STC) distance from 0.30 to 0.76 m. Outdoor test confirmed that the nozzles were triggered from 290 to 380 ms after detecting tree canopy at 3.2 km/h. The spray rate of the new sprayer was 58.4 to 85.2% of the constant application rate (935 L/ha). Spray coverage was collected at four areas of evergreen canopy by water sensitive papers (WSP), and ranged from 1.9 to 41.1% and 1.8 to 34.7% for variable and constant rate applications, respectively. One WSP area had significant (P < 0.05) difference in mean spray coverage between two application conditions.
논문 : 정보처리 및 복합기술 ; 기계시각을 이용한 분무입자크기 측정
전홍영 ( H. Y. Jeon ),티안레이 ( Lei Tian ) 한국농업기계학회 2010 바이오시스템공학 Vol.35 No.6
A machine vision-based instrument to measure a droplet size spectrum of a spray nozzle was developed and tested to evaluate its accuracy on measuring spray droplet sizes and classifying nozzle sizes. The instrument consisted of a machine vision, light emitting diode (LED) illumination and a desktop computer. The illumination and machine vision were controlled by the computer through a C++ program. The program controlled the machine vision to capture droplet images under controlled illumination, and processed the droplet images to characterize the droplet size distribution of a spray nozzle. An image processing algorithm was developed to improve the accuracy of the system by eliminating random noise and out-of-focus droplets in droplet images while measuring droplet sizes. The instrument measured sizes of the three different balls (254.0, 497.8 and 793.8 μm) and the measurement ranges were 241.2-273.6 μm, 492.9-529.6 μm and 800.8- 824.1 μm for 254.0-, 497.84- and 793.75-μm balls, respectively. Error of the measured droplet mean was less than 3.0 %. Droplet statistics, D(V0.1), D(V0.5) and D(V0.9), of a reference nozzle set were measured, and droplet size spectra of five spray nozzles covering from very fine to extremely coarse were measured to classify spray nozzle sizes. Ninety percent of the classification results of the instrument agreed with manufacturer`s classification. A comparison study was carried out between developed and commercial instruments, and measurement results of the developed instrument were within 20 % of commercial instrument results.
논문 : 생물생산시설 및 환경공학 ; 원적외선과 열풍 건조조건에 따른 오징어의 건조특성
강태환 ( T. H. Kang ),홍현기 ( H. K. Hong ),전홍영 ( H. Y. Jeon ),한충수 ( C. S. Han ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.2
Drying characteristics of squids under two dry conditions were investigated using far infrared and heated air. Dry temperatures of 40, 50 and 60℃ with air speed of 0.6, 0.8 and 1.2 m/s were used for evaluating far infrared squid drying. Heated air squid drying at 40 and 50℃ with air speed of 0.8 m/s was used as a control treatment. The two drying were evaluated in terms of drying rate, color, TBA value, aerobic bacteria, cutting shear, penetration strength, and energy consumption. The drying rate of far infrared drying was relatively faster than that of heated air drying. The drying time of far infrared drying was reduced as the drying temperature increased. The color difference of far infrared dried squids was from 18.81 to 22.85, and heated air dried squid had the color different from 23.94 to 24.09. Far infrared dried squid had relatively smaller TBA values that indicate a level of rancidity. The aerobic bacteria of heated air dried squid increased from 970×10(3) to 40,000×10(3) CFU/g before and after drying, respectively. Far infrared dried squid had relatively smaller increase (from 970×10(3) to 40,000×10(3) CFU/g). The cutting shear and penetration strength for far infrared dried squids was relatively lower. In addition, far infrared squid drying consumed relatively less energy compared to heated air drying.
한충수,고학균,송대빈,서정덕,전홍영 충북대학교 농업과학기술연구소 2000 農業科學硏究 Vol.17 No.-
Brown rice characteristics (i.e., moisture content, crack ratio, and hardness) were determined to determine proper conditions of brown rice before milling process and to develope a brown rice conditioning machine. Water was sprayed with the flow rate of 50, 100, and 150 cc/min onto brown rice while the brown rice were falling down with the mass flow rate of 15㎏/tin from the upper to lower hopper of the conditioning machine. After conditioning with different water flow rates of 50, 100, and 150 cc/min, the moisture content was decreased negative exponentially with respect to the time lapse. Initial moisture content of 14.8% of brown rice moisture content was increased to 15.1%, 15.3%, and 15.8% after conditioning with water flow rates of 50, 100, and 150 cc/min, respectively, after 14 hours time lapse. Initial crack ratio of 8.7% of brown rice crack ratios were increased positivee exponentially with respect to the time lapse after conditioning with water flow rates of 50, 100, and 150 cc/min. The hardness of the brown rice was decreased after conditioning with water. Models of variation of the moisture content, crack ratio, and hardness of brown rice respect to the time lapse after conditioning with water was developed using experimental data. 주요 용어(Key words): 현미(Brown rice), 조질(Conditioning), 동할율(Crack ratio) 강도(Hardness).