• 대한조선학회논문집
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• 제47권5호
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• pp.743-749
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• 2010

Multi-nozzle spray painting procedure of the inorganic zinc shop primer was established in order to obtain uniform film thickness. The shop primer paint prevents the corrosion of steel block during shipbuilding. When the dry film thickness of shop primer is insufficient, rust will be generated on the steel block. Otherwise, thick coating of shop primer may be a problem of weld defect. So, it is important to obtain the uniform film thickness of shop primer. The uniformity of dry film thickness is affected by spray speed, distance from spray gun to target surface and overlapping span of spray path. In order to uniformly maintain coating thickness of shop primer, the coating procedure was established based on the correlation of shop primer spray variables.

• 한국분무공학회지
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• 제8권3호
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• pp.27-32
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• 2003

It is important to improve the efficiency of the existing small scale burner which used in agricultural product dry system and gardening dry system. In order to economize fuel Consumption and decrease the exhaust emission especially $CO_2$, the better design for the small scale burner is needed. Spray characteristics are the essential element for the design. Macroscopic spray characteristics such as spray angle and breakup length were measured. SMD which is contained the Microscopic spray characteristics was measured too. SMD was measured at 8mm, I2mm, I6mm downstream of the nozzle tip for both Hago and Danfoss nozzles by the Malvern Particle Sizer.

• Journal of Welding and Joining
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• 제32권3호
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• pp.43-52
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• 2014

Recent developing tendency of thermal spray for green automotive industry are studied by searching of NDSL, KIPRIS, ScienceDirect and so on. Spraying techniques such as plasma spray, microwave treatment, dry-ice blasting, HVOF thermal spray, cold spraying, aerosol deposition are introduced, further more spraying materials such as nano particles, intermetallic compound, TiAlN, TiC, Si-Al alloys are investigated.

• 대한조선학회논문집
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• 제49권5호
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• pp.433-439
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• 2012

Anticorrosive paint is the most widely used in shipbuilding and the dry film thickness is very important in terms of productivity and assurance of anticorrosive performance. However, it is difficult to achieve the recommended target film thickness because the dry film thickness depends on labor's skill in practice and is affected by a number of parameters, such as spray pressure, paint flow rate, tip size, spray distance, SVR(Solid Volume Ratio), etc. Present paper derives an empirical equation through the correlation analysis of parameters selected by spray experiments of anti corrosive painting in order to predict the coated status. Comparing the calculated results with practical data, we show that the empirical equation can successfully expect DFT(Dry Film Thickness).

• 한국산업융합학회 논문집
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• 제3권4호
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• pp.353-360
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• 2000

The purpose of this research is to find the fundamental data for the design and optimum operation condition for the disk atomization comparing the atomization characteristics of the modified straight vane type disk atomizer and the cup type atomizer widely used in the field of spray dry. First, the experimental comparison of the characteristics of $Na_2SO_4$ atomization has been carried out using the cup type disk atomizer and the three kinds of vane type atomization designed specially for the experiment. After the comparison of the experimental data of the $Na_2SO_4$ and raw milk have been conducted using vane type atomizer.

• 생물환경조절학회지
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• 제1권2호
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• pp.154-161
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• 1992

본 실험은 분무경재배 토마토에 있어서 분무간격이 토마토의 생장, 수량반응과 생체정보와의 관련성을 구명하고자 수행하였다. 분무간격은 10분 정지에 60초, 30초 그리고 10초간 분무되게 하였으며 이것을 연속분무구와 비교하였다. 배양액은 산기의 토마토 배양액을 사용하였다. 1. 엽면적은 30초분무 10분정지구가 가장 높았고 60초분무 10분정지구가 가장 낮게 나타났다. 또한 각 기관의 건물중과 과실건물중 등의 생장특성도 다른 처리구보다 30초분무 10분정지구에서 가장 좋았다. 2. 화수는 건물중이 낮을수록 많았으나 착화수는 60초분무 10분정지구를 제외하고는 유의차가 인정되지 않았다. 3. 엽면적과 과실건물중과의 관계에 있어서는 과실건물중이 가장 높은 30초분무 10분정지구가 엽면적이 가장 많았다. 연속분무구는 엽면적에 비해 과실건물중의 현저한 감소가 나타났다. 본 실험의 범위에서 양액의 적정 분무간격은 30초분무 10분정지인 것으로 구명되었다. 4. 주간의 온실내외의 태양방사는 차이가 크게 나타났으며 온실내 일중 기온은 엽온보다 높게 나타났다. 환경조건의 변화에 따라 토마토 엽의 생체정보의 변화는 민감하게 나타났으며 특히 양액의 분무간격에 따른 차이는 현저하게 나타났다. 5. 분무간격에 따른 엽생장의 변화패턴은 엽수분 potential, 기공저항 및 엽온 등의 생체정보와 관련이 깊었으며 환경요인의 변화에 따른 생체정보 계획으로 토마토의 생장량이나 과실수량 예측의 가능성이 인정되었다.

• 한국작물학회지
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• 제38권4호
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• pp.297-303
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• 1993

식물생장조절제가 벼 건답직파재배시 출아 및 초기생육 촉진에 미치는 효과를 구명하기 위하여, 화성벼를 공시하고 3가지 약제를 사용하여 종자침종 또는 종자분무처리하였을 때 이들의 출아 및 초장신장에 대한 효과를 조사하여 다음과 같은 결과를 얻었다. 1. Gibberellin (GA$_3$ 4% 액제)은 건답직파재배에서 벼의 출아 및 초장신장 촉진에 현저히 효과가 없었다. 2. GA$_3$ 종자침종처리의 적정 농도는 약 100ppm이었고, 종자분무처리의 적정 농도는 약 200ppm이었다. 3. GA$_3$(200ppm)의 종자분무처리는 무처리에 비하여 출아를 1～2일 단축시켰고, 출아율이 높았으며 초장신장 효과가 인정되었다. 4. GA$_3$의 종자처리는 묘의 초엽과 엽신 및 엽초의 신장을 촉진시켰다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 추계학술대회논문집
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• pp.245-250
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• 2003

This research conducted milling tests to study effects of cutting environment conditions of ball end mills on the characteristics of hard milling process. KP4 steels and STD11 heat treated steels were used as the workpiece and WC-Co ball end mill tools with TiAIN coated were utilized in the cutting tests. Dry cutting without coolant and semi-dry cutting using botanical oil coolant were conducted and MQL (Minimum Quantity Lubricant) device was used to spray coolant. Cutting forces, tool wear and surface roughness were measured in the cutting tests. Results showed that dry cutting of KP4 and hardened STD11 specimens produced better surface quality and wear performance than MQL spray cutting did.

• 소성∙가공
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• 제13권1호
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• pp.45-52
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• 2004

This research conducted milling tests to study effects of cutting environment conditions of ball end mills on the characteristics of hard milling process. KP4 steels and STD11 heat treated steels were used as the workpiece and WC-Co ball end mill tools with TiAlN coated were utilized in the cutting tests. Dry cutting without coolant and semi-dry cutting using botanical oil coolant were conducted and MQL(Minimum Quantity Lubricant) device was used to spray coolant. Cutting forces, tool wear and surface roughness were measured in the cutting tests. Results showed that dry cutting of KP4 and hardened STD11 specimens produced better surface quality and wear performance than MQL spray cutting did.

• 동력기계공학회지
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• 제10권2호
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• pp.111-116
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• 2006

Tribologcal property of the ceramics used in severe condition was investigated and both $Al_2O_3$ ball and Al/SiC composite made by thermal spray process[TSP] were used as a specimen in this study. Four kinds of material couple in ball and disk specimens were tested in the dry condition by using ball-on-disk type tribo-tester. Friction coefficient, surface roughness, wear rate, and photograph of the worn surface were investigated. Generally, High SiC contents[$40{\sim}50%$] specimens showed very low friction coefficient below 0.05 and little wear rate in dry condition. And also, low SiC contents[0%] specimens showed a moderate wear rate and high coefficient of friction at the same condition.