• Journal of Biosystems Engineering
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• 제18권4호
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• pp.351-357
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• 1993

Recently, a garlic peeler with high performance is being demanded due to increase of consumption of peeled garlic. Although the air type out of various types of garlic peelers is recommended to remove effectively skin of garlic, it has an important problem of large energy consumption. This study was performed to analyze performance of an air-type garlic peeler for its optimum design. Performance indices to represent performance of garlic peeler include peeling ratio, energy efficiency and peeling performance. The factors such as aperture of nozzle, angle and position of air injection, charge rate of garlic, peeling time and so on must be considered to design optimally an air-type garlic peeler.

• 융합신호처리학회논문지
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• 제24권4호
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• pp.249-254
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• 2023

최근 드론을 활용한 농약 살포 임무로 농민들의 작업 시간을 절약하고 농약 및 인체 유해성으로부터 보호되어 드론 보급이 활성화되고 있다. 기존 농약 살포 방식인 광역방제기와 헬기 방제에서 파생된 여러 단점 보완이 가능하다. 최근에는 스마트팜 확대 정책으로 IoT 기반의 다양한 작물의 생육 정보를 실시간 모니터링하고 핵심 변수에 대한 빅데이터 수집을 통해 최적의 생육 환경을 구축하여 수확 증대를 통한 농민의 수익 창출에 적극 활용되고 연관 드론 산업 기술도 발전되고 있다. 본 연구에서는 농업응용 분야의 다양성을 확보하기 위해서 비닐하우스 차광을 위한 작업에 드론을 적용하였고 차광막 살포와 관련된 기술 구현을 구체화하기 위하여 비닐하우스 환경에 대한 기초 연구를 실시하였다. 비닐하우스의 내부와 외부 환경을 고려하여 양질의 빛을 제공하기 위해 드론 노즐의 균일 살포를 위한 노즐설계, 비닐하우스의 투광률 분석, 차광제 도포 실험을 통하여 드론을 활용한 차광임무가 가능하도록 하는 기초연구를 수행하였다.

• 농약과학회지
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• 제16권3호
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• pp.230-235
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• 2012

본 실험은 포장과 살포기의 차이가 고추 열매 중 농약 잔류량에 미치는 영향을 구명하고자 하였다. 위치가 다른 세 농가 포장에서 비슷한 시기에 정식한 고추를 대상으로 동일한 분무기와 노즐로 약제 처리 후 1일차의 농약 잔류량은 통계처리로 확인하여 차이가 없었다. 시료 채취시 고추나무 외부의 고추 중 잔류량은 내부의 고추 보다 2배 이상 많아 시료 채취의 위치가 고추 중 잔류량 변이의 요인이 되었다. 배부식 동력분무기와 압축식 인력분무기 사용에 따른 농약잔류량 차이는 동력분무기가 인력분무기를 사용할 때 보다 1.7배 높은 잔류농도를 보였는데 이는 약제 살포시 인력분무기의 상용압력보다 2배 정도 높은 동력분무기 압력과 노즐의 영향으로 판단되었다.

• 농약과학회지
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• 제16권4호
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• pp.336-342
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• 2012

본 실험은 엽채류 중 들깻잎, 상추, 케일에 살포된 농약의 잔류량을 비교하기 위해 수행하였다. 농약 9종을 대상으로 2구 선형노즐을 부착한 배부식 동력분무기로 7일 간격 2회 살포 후 0, 2, 5일의 잔류양상을 조사하였다. 무게 대비 엽면적 비율($cm^2/g$)은 들깻잎 58, 상추 27, 케일 23 으로 나타나 들깻잎이 상추 보다 2.1배 높았다. 살포 직후 잔류량은 들깻잎이 상추 보다 1.3~2.3배 높게 나타났으며 케일은 상추보다 2.4~7.3배 높았다. 살포 후 5일에는 들깻잎이 상추 보다 1.3~3.3배 많았으며 상추는 케일보다 5.6~28.1배 높았다. 케일의 잔류량이 적은 것은 잎 표면이 매끄러워 살포된 농약입자가 쉽게 흘러내리는 것이 원인으로 보인다. 상추와 들깻잎의 잔류량 차이는 무게 대비 엽면적 비율의 차이에 따른 영향이 크다고 판단되었다.

• 한국농공학회논문집
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• 제62권4호
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• pp.87-97
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• 2020

The livestock infections had been happened seasonally, but they have gradually changed to be irrelevant to seasons and have an aspect to rapidly spread after outbreak. Especially in Korea, proactive disinfection measures are very important because the livestock farms are located densely so high as to accelerate the spread of disease between farms. livestock disease outbreaks like HPAI and FMD occurred with high probability due to vehicles visiting the farms, this study is to evaluate the efficiency of livestock vehicle disinfection systems by investigating the disinfectant coverage according to the type of vehicle disinfection system and the type of vehicle quantitatively. In field experiments, water-sensitive papers (WSPs) were attached to 21 locations on the surface of four vehicles (sedan, SUV, truck, and feed transport), respectively, and exposed to disinfectants while the vehicle was sprayed in two vehicle disinfection systems (tunnel type and simplified type). The WSPs were scanned and image-processed to calculate the disinfectant coverage. The results showed that the tunnel-type vehicle disinfection system had a better disinfection performance with an average coverage of 90.27% for all vehicles compared to 32.62% of the simplified type system. The problem of the simplified system was a wide coefficient of variation (1.05-1.31) of the disinfectant coverage between 21 locations indicating a need for further improvement of nozzle location and arrangement.

• Journal of Biosystems Engineering
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• 제28권5호
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• pp.395-402
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• 2003

Standard ginseng seedling, selected after one year's rearing in the seedling bed has been conventionally transplanted in Korea. Recently, the direct seeding areas have been increasing to product high quality ginsengs for red-ginseng processing. Reciprocating push-rod brush, holed-roller and vacuum suction seeders, planting with 30 ${\times}$ 30mm spacings and adjustable to the folds were designed and theirs performances were evaluated. The developed three types of seeders reliably performed at the success rate over 95% with less than 10% in slip rate, and could be used a seeder for the greater spacings by adjusting metering parts. The research concluded that the vacuum suction seeder was the most feasible and practical with the greatest metering success and the least slip among three type seeders of the reciprocating push-rod brush, holed-roller and vacuum suction seeders. The vacuum suction seeder holds a seed with each needle nozzle using the negative pressure created by a vacuum pump. The capacity was 24.5 times greater than a man power at the speed of 5 m/min.

• Journal of Biosystems Engineering
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• 제20권3호
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• pp.288-298
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• 1995

In greenhouse vegetable, the automatic control in cultivating environment has been projected as a national business ; especially a countermeasure against the settlement of UR negotiation. Because it makes possible to manage a large greenhouse with family-hands and to expect the betterment of quality and the increasement of harvest in crops. In the course of carrying the workout, however, there are many problems with the overall control system with computers as well as the individual systems for environment control because of hardware and software problems : especially the shortage of data for development of the system is most serious. Among the many problems for development of the automatic control system, the automations of irrigation, liquefied fertilizer and chemical solution, mixing and ventilation, etc and the development of the general automatic controller system for environment control in greenhouse are studied, which requires a lot of tabors. The results are summarized as follows ; 1. In moisture control by the soil moisture meter, the error was shown 10 % in the beginning irrigation point and 19 % in the stop irrigation point. 2. The supply of liquefied fertilizers with the irrigation system was excellent by setting the operating time and the mixing ratio. 3. The developed chemical spraying system was operated well, but not perfect in nozzle positions. 4. The cucumber was cultivated properly with the trickle irrigation system. 5. The developed controller for the automatic control system in greenhouse was remarkable in the part of hardware, but more researches are needed in the part of software.

• Journal of Biosystems Engineering
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• 제27권4호
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• pp.311-316
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• 2002

This study was carried out to investigate the optimum operating conditions of the air injection type onion peeling device which could be attached to a prototype onion peeler. An onion, stem and root was cut and some vertical line was dug in 1 mm depth on the skin, was put on the two parallel rollers. The diameters of the rollers were 105 mm and the ratio of peripheral velocity was 3:2, and moved by a geared motor. Air from the nozzle with high pressure and velocity was jetted to the rotating onion on the revolving rollers, and then the skin of the onion was stripped. On the test, the rolling characteristics of the experimental materials were measured. The effective peeling conditions were, the number of digging line on the skin of the onion was 4, and the air jet pressure was above 392.3 kPa(4.0 kg/$\textrm{cm}^2$) when the peripheral velocity was at 2.4 m/s. On these conditions, time requirement to peel an onion was less than 2 sec.

• Journal of Biosystems Engineering
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• 제14권3호
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• pp.196-206
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• 1989

와권(渦券) 노즐에 작용(作用)되는 힘은 분두(噴頭)의 도구(導溝) 및 와실(渦室)의 기능(機能)에 의하여 축방향력(軸方向力)과 반경방향력(半徑方向力)으로 분류(分類)되고, 이 두 개의 힘은 미립화(微粒化)의 과정(過程)에 각각(各各)의 특성(特性)을 주고 있다. 반경방향(半徑方向)의 힘은 분두(噴頭)에서 분사(噴射)되는 입자(粒子)에 전단력(剪斷力)으로서 작용(作用)하지만 이 힘의 크기는 물방울의 직경(直徑) $100{mu}m$을 기준(基準)하여 2.4m/s의 속도(速度) 이내(以內)의 범위(範圍)이었으며, 그 속도범위(速度範圍)는 다음 유도된 식(式)으로 산출(算出)할 수 있었다. $$V_{ot}=(\frac{8g{\sigma}}{d{\gamma}})^{1/2}$$ 축방향력(軸方向力)은 아래 유도된 식(式)과 같이 분사액류(噴射液流)의 굴절각에 매우 민감하게 영향을 미치었고, 그 크기는 반경방향력(半徑方向力)에 비교(比較)하여 큰 값을 나타내었다. $$V_{\ell}={\sigma}[\frac{1}{2}{\rho}_{a}sin2{\theta}_d-4({\mu}+{\eta})\frac{\ell}{r_o}]^{-1}$$.

• Journal of Biosystems Engineering
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• 제35권6호
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• pp.426-433
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• 2010

This study was conducted to develop a pull-type sprayer which performs the safe spraying with improved ergonomic postures while pesticide spraying of roses in floricultural facilities. The performance of the ergonomically designed sprayer was analyzed with a comparison of a conventional spray method. The pull-type sprayer, consisting of power pump, hose and nozzle parts was designed to manually pull and spray to upward and horizontal directions. From the analysis of postures with the RULA method, the labor load to arm and wrist using the pull-type sprayer was less than that with conventional power sprayer, so that the intensity of labor reduces. Working capacity with pull-type sprayer was two-fold greater than the conventional power sprayer. After performing pesticide spraying with the pull-type sprayer, the operating cost was reduced to \585,000/yr, which is 79% less than that of cost (\2,197,500/yr) for using conventional power sprayer.