Painting pretreatment is an important task in determining the life of painting as it removes rust or foreign substances from the painting surface and gives adhesion between the painting surface and the painting surface. Since painting pretreatment is an important task, IMO strictly requires that the painting pretreatment surface be maintained at a Sa 2.5 grade and the surface roughness is 30μm~75μm. Painting pre-processing is an important task that determines the lifespan of a painting, but it is done through visual inspection by the inspector, and the quality varies depending on the inspector. In this study, in order to develop a quality measurement system for the painting pretreatment surface, Matlab2023b was used to determine the range of appropriate quality brightness by comparing the brightness of the painting pretreatment surface and surface roughness.

The paint removal of fighter jets is just as important as the painting, because perfect paint removal ensures the quality of the exterior painting on the aircraft. However, the current conditions for paint removal work of the ROKAF’s are poor. It is identified that the painting process currently implemented by the ROKAF is not only exposed to harmful compounds such as harmful dust and hexavalent chromium, but also consumes a lot of water. Thus, the introduction of advanced facility is considered. This study compares the fighter jets painting removal process currently applied by the Korean Air Force with the improved laser coating removal process of the US Air Force, and conducts an incremental analysis to perform economic analysis for the introduction of advanced facility. Four scenarios were envisioned on the premise of an increase in the number of fighters in the future, incremental analysis shows that laser coating removal method is advantageous in all scenarios. In addition, it is recommended that paint removal cycle keeps the current 12-year and the outsourcing amount to civilian depot is reduced.

The Korean Air-Force aircraft maintenance depot paints the exterior of various aircraft, including high-tech fighters. Aircraft exterior painting is a maintenance process for long-term life management by preventing damage to the aircraft surface due to corrosion. The de-painting process is essential to ensure the quality of aircraft exterior paints. However, because the Korean Air-Force’s de-painting process is currently done with sanding or Plastic Media Blasting (PMB) method, it is exposed to harmful dust and harmful compounds and consumes a lot of manpower. This study compares the de-painting process currently applied by the ROK Air-Force and the more improved process of the US Air Force, and performs economic analysis for the introduction of advanced equipment. It aims to provide information that can determine the optimal time to introduce new facilities through Cost-Volume-Profit (CVP) analysis. As a result of the analysis, it was confirmed that the sanding method had the most economical efficiency up to 2 units per year, the PMB method from 3 to 21 units, and the laser method from 22 units or more. In addition, in a situation where the amount of de-painting work is expected to increase significantly due to the increase in fighters in future, BEP analysis was conducted on the expansion of the existing PMB method and the introduction of a new laser method. As a result of the analysis, it was confirmed that it is more economical to introduce the laser method when the amount of work exceeds the PMB work capacity(18 units per year). The paper would helpful to improve the productivity and quality of the Korean Air Force Aircraft maintenance depot through timely changes of facilities in the workplace in preparation for expansion.

The objective of this study is to identify the emission characteristics of VOCs from small-scale painting facilities, such emissions being pollutants that impact nearby living areas and to devise improvement measures to enhance management plans regarding pollutant emissions from painting facilities. VOCs emissions from painting facilities were estimated according to Clean Air Policy Support System (CAPSS) data based on the National Institute of Environmental Research (NIER)'s emission list in 2017. Three automotive painting facilities in Seoul were chosen for evaluation of the adsorption system. We analyzed the characteristics of VOCs generated by type of different operation and measured the removal efficiency of the adsorption system. Therefore, we analyzed current emissions of VOCs from automotive painting facilities based on field measurements. According to such detailed analysis, a systematic management plan was proposed.

The emission of particulate matter and volatile organic compounds (VOCs) from a motor vehicle painting booth was quantitatively evaluated. Most particulate matter was emitted during the spraying process, in which the PM10 concentration was 16.5 times higher than that of the drying process. When the paint was being sprayed, the particles with a diameter of 1.0~2.5 μm accounted for 39.4% and particles greater than 2.5 μm in diameter accounted for 30.6% of total particles. On the other hand, small particles less than 0.5 μm in diameter accounted for 52.4% of total particles during the drying process. In contrast to the particulate matter, high concentrations of VOCs were emitted during both spraying and drying processes. Butyl acetate, xylene, toluene, and m-ethyltoluene were the most abundant VOCs emitted from the motor vehicle painting booth. Additionally, xylene, butyl acetate, toluene, and 1,2,3-trimethylbenzene were the dominant ozone precursors. Especially, xylene exhibited the highest ozone production contribution (32.5~44.4%) among 34 species of the ozone precursors. The information obtained in this study can be used to establish a suitable management strategy for air pollutants from motor vehicle painting booths.

본 연구는 원통형 종이포트 토마토 육묘시 Diniconazole의 처리방법이 도장억제 및 근권발달에 미치는 영향을 검토하기 위하여 수행되었다. 그 결과, 엽면적, LAR, 초장, 충실도, 생체중, RGR 및 R/S 에서 시험구간 유의한 차이를 보였다. 동일한 농도를 처리했을 경우, 근권부와 지상부의 흡수도 차이로 인해 저면관수가 엽면살포에 비해 도장억제에 효과적이었다. 저면관수는 엽면시비의 10분의 1의 농도만으로도, 20~30%정도의 동일한 도장억제 효과를 얻을 수 있었다. 디니코나졸 처리에의한 근권부 반응이 흥미로웠는데, 저면관수시 총근장, 근권부피, 평균 근경 및 근단수가 증가하였다. 특히, 0.3mm 이하의 초미세근이 감소하고 0.3~0.6mm의 세근이 증가하였다. 따라서 원통형 종이포트 육묘시 저면관수를 하는 것이 기존 엽면시비에 비해 사용량이 적으면서도 도장억제 및 근권부 활착률을 높힐 수 있을 것으로 판단된다.

본 연구는 원통형 종이포트를 활용한 토마토 육묘시, 염스트레스를 활용하여 고온기 도장 억제가능성을 검토하기 위하여 수행되었다. 시험구는 K2SO4, KCl과 KH2PO4을 각 5, 10 dS·m-1로 처리하였고, 또한, 토마토 모종에 고염도의 칼륨을 처리하여 수분 및 저온스트레스 환경에서의 적응성 및 생존성을 조사하였다. 조사결과, 처리 농도가 높아질수록 지상·지하부 건물중, 옆면적, 순동화율 (NAR)이 감소하고, 경경과 충실도는 증가하였다. 수분 스트레스 처리 이후, 대조구는 심한 위조현상을 보였지만, KCl처리구는 양호하였다. 상대수분함량은 대조구에서 23%, KCl처리구에서 8% 감소 하였다. 또한, 대조구에 비하여 KCl 처리구는 저장시(9, 12 및 15°C) 모종의 손상 비율이 낮았다. 이와 같은 결과로 보아, KCl과 같은 고농도의 칼륨 처리가 원통형 종이포트 토마토 육묘의 도장 억제에 효과적이며 환경 스트레스 내성을 향상시키는 것으로 판단된다.

Deicing agent refers to the substance that melts snow by exothermic or endothermic chemical reaction after spraying on snow. It also has the function of reducing the freezing point to prevent freezing. However, the long-term use of deicing agent can cause some negative problems, such as pot hole, concrete corrosion, vehicle and steel bridge parts corrosion. At present, wet salt spray deicing is a cost-effective deicing method that is being widely used. Typical deicing agents are calcium chloride and sodium chloride. Deicing equipment is placed to similar or higher corrosive environment than coastal or marine environment due to direct contact to chloride in deicing operation. Therefore, the anti-corrosion control is very important for the maintenance of deicing equipment. In this study, corrosion resistance, blistering and repairability of the deicing equipment were tested by using test standard (salt water production and spraying- KS D 9502 , evaluating degree of rusting- ASTM D 610, evaluating degree of blistering- ASTM D 714, pull-off strangth of coatings- ASTM D 4541). And an economical coating system with long-term antirust performance was constructed. The results show that the performance of the coating system has been improved than with the original coating.

LED (Light Emitting Diode) 조명은 차세대 조명으로 주목 받고 있으나 조명에서 방출되는 열에 의해 조명의 수명이 상당히 단축되는 문제가 있다. 이를 해결하기 위해 Al, Al-Zn 합금, Mg 합금 등의 열 전도성과 가벼운 재료를 heatsink로 사용되고 있다. 하지만 출력이 높고, 사용되는 조명의 수가 많을수록 heatsink의 크기가 커져야 하는 문제가 있다. 이를 해결하기 위해 본 연구에서는 heatsink 표면의 방열 성능을 향상시키기 위해 spray coating 방식에 비해 도막 형성이 균일한 전착도장 (electrodeposiion coating) 방식의 도료를 합성하였다. 열전도도를 향상시키기 위해 전도성 구형 안료와 침상 안료를 사용하였고, 이를 비교하기 위해 heatsink의 온도 변화를 측정하였다. 그리고 도막의 표면을 Scanning Electron Microscope를 통해 관찰 하였다. 안료의 첨가에 따라 코팅막에 복잡한 구조가 만들어졌고 열을 전도할 수 있는 경로를 제공하여 방열 성능이 향상됨을 확인하였다.

In the painting process of automotive factory, color changeover cost is incurred every time the color of vehicle is changed. To solve this problem, automotive company usually uses storage space such as Selectivity Banks(SB) or Car Rescheduling Storage and carries out sequence planning so that vehicles of the same color are consecutive, which is called Car Resequencing Problem (CRP). So far, research works for CRP has focused on algorithms finding optimal or approximated optimal solutions under the condition that the number of vehicles is fixed in SB. However, these results cannot be directly applied to the actual automotive paint shops since they have continuous flows of cars into SB to be handled in a day. Therefore, in this paper, we propose an efficient cyclic scheduling method that starts the painting process using the result of Accelerated Dynamic Programming (ADP) and then reapplies the ADP to the vehicles in SB for renewing the painting schedule whenever a certain number of vehicles is painted, represented as a threshold. To show the effectiveness of the proposed method, we performed a numerical experiment by designing system configurations, based onthe actual vehicle painting process, and proposed a good threshold that can reduce overall color changeover cost.

VOCs는 인체에 치명적인 질환을 유발하는 물질로써 도장공정중 발생되는 양이 가장 큰 비 중을 차지하고 있다. 일반적으로 소형 도장시설에서 발생되는 VOCs를 처리하는 방법으로 활성탄 흡착 또는 흡착 후 연소 및 촉매 산화법 등을 사용하고 있다. 하지만 활성탄 교체주기, 재생시설 및 재생주기 등을 예측하기 어려워 새로운 처리방법이 필요하다. 비이송식 플라즈마 시스템을 이용한 VOCs 제거방 법은 일반 연소과정이 아닌 고전압 아크 방전에 의한 고온 플라즈마 유동 발생 기술을 이용한 제거방법 으로 화학반응이나 오염이 없는 고순도의 고온 열처리 및 열분해가 가능하다. 본 연구에서는 고온 아크 플라즈마 시스템을 이용하여 특수 환경오염물 및 VOCs 가스 열처리 공정의 핵심기술로 활용하여 작동 가스 유량 변화에 따른 VOCs 처리 효율 및 플라즈마 전력량에 따른 처리 효율을 측정하였다. 또한 유 해가스 처리효율성 증대를 위해 플라즈마 반응기를 최적화하여 제작하였으며 성능을 파악하였다.

최근 10여년간 공동주택 하자보수를 둘러싼 기획소송이 전국적으로 확산되면서 전체 이행 청구 금액이 4,700억원을 넘어서고 있으며, 특히 일부 법무법인이나 하자진단업체가 주도 하는 기획소송 상당수가 보수보다는 손해배상에 초점을 맞추고 있어, 이해 관계자들의 갈 등과 건설사 피해, 그리고 장기적으로는 시공비용 및 분양가 상승으로 연결될 수 있으며, 정작 하자보수를 적기에 할 수 없어 입주자의 불만이 높아가고 있다. 공동주택의 하자 중 외벽도장의 하자를 판정할 수 있는 기준이 애매함으로 하자판정기준의 부재는 입주자와 시 공회사간의 의견대립과 소송증가를 초래하고, 법원감정인의 주관적인 판단에 의한 감정금 액 산출과 법원의 보수공사비 판결로 이어지는 문제로 나타나고 있어, 공동주택의 외벽도 장 기준마련이 시급한 상태이므로 좀 더 심도 있는 연구를 통하여 체계적이고 합리적인 방 안을 마련하고자 한다. 하자보수 판결금액은 실 보수 금액보다 과다하게 판결되고, 하자소송이 증가하는 원인이었 다는 것을 알 수 있다. 이상과 같이 외벽도장공사로 인한 하자소송의 소모적인 분쟁과 사 회적인 낭비를 줄이기 위해선, 관계법령에 외벽도색 기준의 명문화가 시급하여 다음과 같 이 제안하고자 한다. 첫째 전체보수비 중 균열보수비는 63.02%와 외벽도색 공사비가 32.14%로 높은 비중을 차 지하고 있다. 도장하자보수비는 도장공사의 부적합시공에 의한 하자보다 콘크리트 구조체 의 균열발생에 따라 균열 보수 후 미관상, 심미적인 면을 보완하는 방법으로 도장공사를 실시하고 있다. 공동주택의 외벽도장은 부분도장과 전체도장으로 구분하며, 도장횟수와 고 소할증에 따라 감정인마다 많은 차이를 보이고 있다. 외벽 균열보수 후 벽면도장은 일반 적으로 균열로 인한 부분도장 면적이 8.0% 이상일 경우 전체도장을 하며, 미만인 경우 부 분도장으로 적용 한다. 둘째 공동주택 외벽도장 하자보수 판결 66건 중 감정인이 산정한 부분도장은 27건으로 42.85%이며, 전체도장 중 1회 도장 29건으로 46.03%, 2회 도장 7건으로 11.11%로 전체도장 이 57.15%이다. 대체적으로 60~90% 판결이 전체의 80%정도이며, 80%의 판결이 30.3% 로 가장 높기에 이를 적용 한다. 셋째 공동주택 외벽 도장공사는 건설표준품셈에 고소작업시 노임할증을 공통사항에 적용 하는 방법과 건축공사 도장공사에 적용하는 방법이 있으나, 외벽도장 공사의 구체적인 기 준이 없는 관계로 감정인은 2015년도 서울중앙지방법원 감정실무 기준을 적용하나, 지나치 게 과다하게 산정되어 현실성이 떨어져 많은 불만을 갖는 관계로 실제 공사시 전문업체의 작업능률에 따른 노임할증을 고려하여 25층일 경우 15% 가산을 적용 한다. 넷째 균열보수후 부분도장만 실시할 경우에는 2회 도장 30㎝로 하며, 전체도장을 실시할 경우에는 도장공사비의 60%는 건설회사, 40%는 입주자가 부담하는 것을 제안하고자 한다.

Tracked vehicles for military application such as tank and armored vehicle are operated in severe conditions of driving on gravel road and muddy water including river-crossing. Thus, coating on such vehicles requires more robust characteristics of coating in adhesion, corrosion(salt-spray) resistance and water resistance than those of vehicles for civil applications. Currently, coatings applied on the military equipments are mostly based on the U.S. military specification(known as Mil-SPEC). Typical specifications for primer materials for military application are MIL-P-23377 and MIL-P-53022. And for topcoat, coating material of KDS 8010-1004 specification is typically applied. However, as MIL-P-23377 or MIL-P-530224 is applied for primer coating not only on the tank and armored vehicle at system level but also on the sub-components of these equipments, there has been a need for test data for determining the feasibility of alternatively applying either of these two coatings for primer coat. Therefore, in this study, coating characteristics are compared with respect to these two different primer coating materials so that the feasibility of alternatively applying them is investigated.

Within aging rotary painting system for plastic wheel cover, sprayed paint particles caused the quality problem as attached to back surface of the wheel cover by the cyclone vortex in the booth. The purpose of this study is to select the spray conditions to ensure a stable quality of the rotary painting system. For this, simulation for flow characteristics of each spray nozzle have been carried out using ANSYS program, and tested to find the optimum spray condition, such as spray distance, spray pressure and rotation speed by manufactured test apparatus of paint spray. Finally, satisfactory results were obtained by testing with a actual painting system in developed spray conditions.

The purpose of this study is to investigate the actual field application of the airless paint spraying pump driven by the hydraulic power unit under high pressure condition. The velocity and the pressure distributions are obtained using the turbulent k-ε model. The flow characteristics under design condition of spraying pump was numerically conducted by commercial fluid dynamic code(CFX ver. 13). The numerical analysis was performed by transient technique according to the variation of stroke times, which is changing from 0 to 1 seconds by interval of 0.01. Turbulence model, k-ω SST was selected to quaranty more accurate prediction of oil flow. The ICEM-CFD 13 and CFXMesher, reliable grid generation software were also adapted to secure high quality grid necessary for the reliable analysis. According to the simulation results, the flow rate was supplied to the paint spraying pump is 5l/min. These results are in good agreement with design results and could be applied to the design of the high viscosity paint spraying pump.

PURPOSES: By conducting the landscape survey that considered landscape factors of the Guide Coating in the Median Barrier that applied of the various level by simulating of the Guide Coating in the Median Barrier on the expressway, they showed the quantitative standard of landscape preference factors that the Guide Coating gives. METHODS: The shape of the Structural Equation Modeling used AMOS program and made a shape that is made of landscape preference for the Guide Coating in the Median Barrier on the expressway a dependent variable. RESULTS: Result in this, they showed that functionality and emotionalism are the factors that affect the landscape preference. CONCLUSIONS: In the main study, not only showing the Guide Coating in the Median Barrier on the expressway landscape valuation but also embodying the Structural Equation Modeling(SEM) of each group, knowing the Guide Coating and unknowing the Guide Coating. By embodying this, they could study that the drivers' quantitative standard is different when the Guide Coating become first applied and being changed after.