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조형열 ( Hyung Yoel Cho ),조성현 ( Sung Hyun Cho ),김은아 ( Eun A Kim ),김병규 ( Byung Gyu Kim ),박승현 ( Seung Hyun Park ),강성규 ( Seong Kyu Kang ) 한국산업위생학회 2008 한국산업보건학회지 Vol.18 No.4
The objective of the survey is to define and judge exposure profiles from semi-qualitative data in high risk processes using styrene. The survey was conducted in 98 factories out of 229 factories based on data from periodic work environment monitoring results for styrene. Styrene is widely utilized as a raw material for PS and co-polymers such as ABS, SAN, SBR, SBL, unsaturated polyester resins(UPR) and others. An approximate breakdown of styrene`s markets in Korea is PS 30%, expandable PS 17%, ABS 33%, SAN 5%, SBL 4%, SBR 3%, UPR 1% and other 7%. Although UPR accounts for 1% of total amount of styrene, workers dealing with it are exposed to very high concentrations up to 64 ppm. Especially styrene is widely used in the laminating process of fiberglass reinforced plastics(FRP) manufacturing industry. The Applications using styrene are largely classified into two sections which are applied to styrene monomer(SM) and UPR. SM is utilized for a raw material of resins, surfactant and adhesive. UPR is employed for FRP and non-FRP. For SM control targets are mixing colors and packing in the gelcoat resins manufacturing industry(MI), for UPR control targets out of works using UPR are 1) laminating in the MI of plastics, automobile parts and boats, 2) mixing and packing in the SMC/BMC MI, 3) molding and cutting in the other specific plastics MI, 4) mixing and coating in artificial marble product MI, 5) dipping in the electric motors & transformers MI, 6) molding in the button MI, 7) painting in the musical instrument MI. Findings from the study have given the information for the high risk processes and working practices so that occupational health professionals could focus on targeted workplaces to prevent occupational diseases. It is also useful to develop a control strategies and specific controls for high risk processes and facilities using styrene.
조형열 ( Hyung Yoel Cho ),조성현 ( Sung Hyun Cho ),유장진 ( Jang Jin Ryoo ),김병규 ( Byung Gyu Kim ),박승현 ( Seung Hyun Park ),강성규 ( Seong Kyu Kang ) 한국산업위생학회 2007 한국산업보건학회지 Vol.17 No.3
Trichloroethylene(TCE) is widely used as a degreasing solvent in workplaces. TCE is primarily toxic to the nervous system, however, systemic disorder like Stevens-Johnson syndrome has been recently reported in small-scale factories, where the government has had limited information of chemical use. A survey was performed to investigate the actual condition of using TCE and to provide practical information to occupational health service agencies and professionals. This survey was carried out on 103 factories out of 430 factories which were conducted periodic work environment measurement for TCE. Degreasing was the most popular reason for using TCE in Korea, which reached to 94%. TCE was also used as a solvent for rubber in the coating or molding process, and adhesives in the bonding process. Metal fabrication was the most common as 23%, followed by assembling automobile parts (17%), and machinery (12%). Workers exposed to TCE during full-shift were 52% while 48% were exposed during short period of the shift or intermittently. Manual or semiautomatic work occupied 87% while automatic work was just 13%. Though automatic work by a closed system was generally lower exposed to TCE, compared to manual work, it can cause a high exposure when the maintenance system is improper. Semi-automatic work especially like open-top degreasing process can cause a high exposure when local exhaust system with condensing and refrigerating coils in the degreaser does not work well. In conclusion, the survey showed nationwide status of TCE exposure in various aspects. It can be used to monitor workplaces and workers exposed to TCE to prevent occupational diseases.
강성규,심준환,류인식,이종현 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
It is one of the most important things in the industry that the measure of flux and speed of running fluid. Recently the demand of this is increasingly intense and multifarious, but our country has practically little accumulation of this technology. So we presented micro beam type piezoresistive flow sensor which . fabricated with RIE and porous silicon micromachining technology. Four type micro beams are presented and each characteristics is also exhibited. It is not use thermal convection so is expected exclude a fault of thermal convection type flow sensor.
미소 빔 구조를 가진 압저항형 유체센서의 제작 및 특성
이종현,심준환,류인식,박창현,강성규 한국센서학회 1999 센서학회지 Vol.8 No.5
Piezoresistive flow sensors with four different types of microbeam structures were fabricated using (100), n/n^+/n three-layer silicon wafer and their characteristics were investigated. Piezoresistors were formed through boron diffusion and its values were about 1 ㏀. Three-dimensional silicon microbeams were constructed by porous silicon micromachining and curled microbeams were fabricated by the difference in the thermal expansion coefficient between silicon and metal. The output response of the fabricated sensor was evaluated through half-bridge. The output voltage increased with increasing length of microbeam at the same flow velocity, while the detectable measurement range extended with decreasing length of microbeam. The output voltage of the fabricated sensors were increased with quotient of 3.2 of the flow rate since the stress of the beam versus the gas flow showed non-linear characteristics.