According to the results of the environmental noise measurement network operated by the Ministry of Environment in 2009, 67% of residential areas exceeded environmental standards during the day, and 82% exceeded during the night. In the case of exclusive residential areas in general districts, 30 cities (67%) exceeded the standards during the day, and 37 cities(82%) exceeded at night. For residential areas along roads, 18 cities(40%) exceeded during the day, and 33 cities(73%) exceeded at night. The Ministry of Environment operates noise and vibration measurement networks for environmental, railway, and aircraft noise, as well as road vibration measurement networks, to assess the noise and vibration status nationwide each year. In this regard, the results of measuring environmental noise in 348 areas across 45 cities nationwide last year showed that many cities in both general exclusive residential areas and residential areas along roads exceeded environmental standards both during the day(67% for general areas, 40% for road areas) and at night(82% for general areas, 73% for road areas). By region, cities such as Hwaseong, Pyeongtaek, Gimpo, and Cheongju showed high noise levels, while Mokpo, Namyangju, Seongnam, and Naju had lower noise levels. The regions with high noise levels were analyzed to reflect phenomena such as population and traffic increases due to regional development. This study aims to expand the noise measurement network in major cities of Jeollabuk-do, where there are relatively few measurement networks, by conducting an environmental noise survey on road traffic noise in Gunsan and Iksan, using it as basic data for establishing noise regulation zones and for the development of environmental noise reduction measures.

In this study, we develop mobile stone cutting machine containing the cut and frame, the frame vertically conveying part and the cutting upper and lower conveying part. The cutting part has saw and it cuts stone. The frame has cutting part, vertically conveying part of can slide on main frame and the main frame has horizontal conveying part. It can move cutting part. Mobile stone cutting machine is composed of two parts. The frame vertically conveying part is installed vehicle and it conveying frame in the vertical direction. The cutting vertically conveying part is installed frame. It can transfer cutting part in the vertical direction.

Recently, it was a very interesting subject to reduce the weight of the parts in the whole industry. A number of manufacturers have tried to reduce the weight as making light material alloy like aluminium and magnesium alloys. Agitation system can maximize the density of melted metal alloy and improve the mechanical property. Ultrasonic agitation system is considered as the method of agitation for making aluminium alloy product. In this study, I've designed the cooling unit of the ultrasonic agitation system. The design of the cooling unit was made through the analysis of the thermal behavior and thermal stress of the agitation system. The results of analysis showed that the cooling units must be applied to the agitation system. They also showed the flux of the cooling water and the effects of the cooling system.

Recently, the automotive part manufacturers have made a lot of efforts to increase the reliability of their products for various reasons. For that reason, many manufacturers have tried to get the automatic inspection system for their products. The automatic system can reduce the number of the workers and increase the accuracy of the inspection. In this study, inspection subject is brake-hose resonator. This component is made through a high frequency bonding process and can have the possibility of a defect like a leak problem. The purpose of this study is to make the automatic inspection system for detecting the implied leak problem of the products with the vision system. Consequently, this study show that the vision system is a very reasonable method to detect the leak problem. The automatic inspection system can decrease the detection time from 35s/EA to 22s/EA in case of continuous operation.