• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1998년도 추계학술대회 논문집
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• pp.48-53
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• 1998

In this paper, the new electrochemical machining method is proposed for the micro unit fabrication by using the point electrode tools. The precision shape control capacity is improved by using the point electrode method. It was observed that an electric discharge phenomenon occurs during the electrochemical machining process by using the spraying and torrent type electrolyte supply method.

• 대한수의학회지
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• 제49권2호
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• pp.113-119
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• 2009

Atrophic rhinitis (AR) is the one of important respiratory diseases and causes severe economic losses in pig industry. Severe attempts have been made to reduce the economic losses by preventing the disease. One of the methods is the spraying of antibiotics into nasal cavity of piglets. Recently, the efficacy of the spraying with kanamycin and gentamicin was reduced in the Korean swine industry. Therefore, the preventive methods have been required to be changed based on the antimicrobial susceptibility profiles of causative agents of swine AR. Based on the current situations of this disease, Bordetella (B.) bronchiseptica and Pasteurella (P.) multocida 4D were isolated from pigs with clinical signs of AR. The isolation rates of B. bronchiseptica and P. multocida 4D were 58.5% and 32.9%, respectively. In the antimicrobial susceptibility test, the bacteria were resistant to kanamycin and gentamicin which have been used as the spraying agents, but they were susceptible to amikacin. A new spraying agent was developed using amikacin using ${\beta}$-glucan and yakbaltag as supplementary agents. Field efficacy of the agent was carried out with different schedule. The results from this study suggested that the newly developed spraying agents might be helpful to prevent AR in swine.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
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• pp.246-251
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• 2000

In this paper, Wire electric discharge grinding(WEDG) method for manufacturing the micro shaft was introduced and the machining characteristics was investigated. from the experimental results, it was concluded that high surface integrity could be obtained by use of dielectric fluid spraying method and small capacitive condenser.

• 생물환경조절학회지
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• 제31권1호
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• pp.52-59
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• 2022

시설재배 온실에서 병해충 방제를 위해 자율적으로 이동하면서 작물에 농약을 살포할 수 있는 무인 자동 농약 살포 시스템을 이용하여 방제처리를 실시하였다. 토마토, 딸기의 총채벌레(Frankliniella occidentalis)와 온실가루이(Trialeurodes vaporariorum) 해충에 대한 방제효과를 조사한 결과, 꽃노랑 총채벌레의 방제효과는 토마토에서 85.6%, 딸기에서 87.5%로 나타났고, 온실가루이는 각각 81.7%와 80.6%를 나타내었다. 또한 약제처리 방법에 따른 방제효과는 관행약제살포 처리구 81.7%, 무인 자율 약제 살포처리구 83.9%의 방제효과를 나타내었다(F=22.1, p < 0.001). 두 처리구간 방제효과 비교 시 현저한 유의성은 나타나지 않았으나 무인 자율 약제 살포처리에서 2.2% 높은 효과를 나타내었다. 한편, 약제 살포 시간을 비교한 결과, 무인 자동 약제 살포기는 살포시간이 5min/10a으로 관행 약제 살포시간 25-30min/10a 보다 25min 정도 적게 소요되었다. 이러한 결과는 발생최성기에 시설온실에서의 효율적인 해충 방제로 무인 자동 약제 살포방제법이 유용하게 사용될 수 있을 것으로 판단되었다.

• Journal of Welding and Joining
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• 제5권2호
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• pp.17-26
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• 1987

In this study, the experiments were carried out for the purpose of establishment of the arc sparing method which reducing oxides or oxide film by using the inert gas as the carrier gas of atomizing particles. Main results obtained are as follows; 1. Oxides and oxide film which lower the adhesion strength are largely reduced by using the inert gas as the carrier gas of atomizing particles, and adhesion strength of coating film are improved. 2. The coating film characteristics appear to be no difference between the inert gas arc spraying in air environment and that in argon gas environment. 3. Inert gas arc spraying using argon as the carrie gas has higher reduction rate of composition element in coating film than compressed air spraying does.

• 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.

• Journal of Information Processing Systems
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• 제15권5호
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• pp.1131-1140
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• 2019

Characteristics of fruit tree canopies are important target information for adjusting the pesticide application rate in variable rate spraying in orchards. Therefore, the target detection of the canopy characteristics is very important. In this study, a canopy volume measurement method for peach trees was presented and a variable rate spraying system based on canopy volume measurement was developed using the ultrasonic sensing, one of the most effective target detection method. Ten ultrasonic sensors and two flow control units were mounted on the orchard air-assisted sprayer. The ultrasonic sensors were used to detect the canopy diameters and the flow controls were used to modify the flow rate of the nozzles in real time. Two treatments were established: a constant application rate of $300Lha^{-1}$ was set as the control treatment for the comparison with the variable rate application at a $0.095Lm^{-3}$ canopy. The tracer deposition at different parts of peach trees and the tracer losses to the ground (between rows and within rows) were analyzed in detail under constant rate and variable rate application. The results showed that there were no significant differences between two treatments in the liquid distribution and the capability to reach the inner parts of the crop canopies.

• 한국컴퓨터정보학회논문지
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• 제28권2호
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• pp.209-216
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• 2023

본 논문에서는 조선소 페인트 분사작업에서 분사 거리와 속도의 변화에 따라 페인트 두께를 추정할 수 있는 모델을 개발하고자 한다. 이를 위해 도장로봇을 이용하여 다섯가지 서로 다른 분사 거리와 속도값에 대한 실험 데이터를 취득하였다. 또한 노즐의 훼손 등으로 인해 노이즈가 발생하는데 이를 처리하기 위해 적절한 전처리과정을 적용하였다. 제안하는 방법은 주어진 데이터로부터 분사 거리와 속도에 대한 페인트 두께 추정 함수를 새로운 분사 거리와 속도에 대한 페인트 두께 추정 함수로 변형하는 계산을 한다. 인공신경망기반 예측 모델과 비교한 결과 제안하는 방법이 더욱 안정적이고 정확하게 예측할 수 있음을 확인할 수 있었다.

• 농촌의학ㆍ지역보건
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• 제9권1호
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• pp.18-26
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• 1984

With the increase of using pesticides, pesticide poisonings become more frequent. In the previous epidemiological study on pesticide poisoning and the reports of the authorities concerned, it is carefully affirmed that pesticide poisonings are caused by farmers' ignorance and negligence in using the pesticides. But the pesticide poisoning should be taken into account in terms of the person who sprays the pesticides, its spraying process, farming style and farmers' socio-economic conditions. And based on the understanding mentioned above, preventive measures for pesticide poisoning should be established. In this socio-medical point of view, this study examined the public health problems caused by using pesticides and the treatment of pesticide poisoning, based on the interviews with farmers in a area of Kyunggi-Do about the spraying process of pesticides, poisoning experiences and its treatments. The results are as follows ; 1) The style of spraying pesticides in the target area is mostly an individual one, not cooperative one. And the subjects of spraying are householders, whose educational backgrounds are beneath notice. More than 2~5 of the subjects are women or old men of 60 years old or so. These are seen to derive from the socio-economic status of Korean agricultural families; their younger generation's moving to greater cities and their petty farming styles. 2) As for the safety measures for the spraying of pesticides, those which have nothing to do with the economic, problems such as efficient spraying and productivity, are well obeyed. On the other hand, some safety measures as the use of safety devices, and spraying time, the degree of dilution of pesticides and the spraying method In windy days, are not obeyed very well, for to keep those makes spraying difficult to do and productivity worse. These facts indicate that the safety measures for using pesticides must be directly concerned with the spraying process, farming style and farmers' socio economic status, rather than the subject's knowledge or carefulness. 3) Even In cases of poisoning they do rarely consult the doctors. This is caused by the problem of their locality and transportation since one should pass away a day even in the busiest season to consult doctors, and by their low socio-economic status. 4) The epidemiological studies on pesticide poisonings should be necessarily led to a socio-medical one which are concerned together with the spraying process of pesticides, farming style, farmer's socio-economic status and discrepancies in public health policies between agricultural communities and urban ones.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 추계학술대회논문집B
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• pp.168-173
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• 2000

Flame aerosol synthesis technology refers to the formation of fine particles from gases in flame and is widely used in practical materials processing. In this paper, an experimental investigation was performed on growth of the silica particles that were generated in $H_2/O_2$ Diffusion Flame by the direct injection or TEOS using Electro-spraying method. in this flame aerosol synthesis, four main parameters or nos interaction (flame temperature, residence time or particle in flame, TEOS flow rate, applied voltage) for particle generation and growth was investigated along the axial direction above the burner. A fairly monodisperse non-aggregated particles were successfully obtained.