• Journal of Environmental Health Sciences
• /
• v.20 no.4
• /
• pp.10-16
• /
• 1994

A Study was performed in order to measure mixed organic solvent concentrations in air of painting operations during January 5-28, 1991. The mixed organic solvent concentrations were analyzed by the gas chromatography. The results were as follows: 1. The detection of organic solvent was highest in aromatic hydrocarbon(68%), and followed by aliphatic hydrocarbon (18%), and ketone (14%). 2. The detection of organic solvent by component category was highest in the grid class solvent (79.4%), and followed by the 3rd class solvent (20.6%). 3. Number of cases exceeding TLVS of mixed solvent level in air was highest on dipping operation (44%), and followed by spray operation (40%), dry and washing operation (33%), and adhensive operation (12%).

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
• /
• v.10 no.S_1
• /
• pp.47-53
• /
• 2001

We carroed our to measure the variations of potential with current density (polarization curves) for poly(ethyleneterephthalate). The results were particularly examined to identify the influences on corrosion potential and corrosion rate of various factors including temperature, pH, exposure time, salt, and enzyme. The Tafel slope for anodic dissolution was determined by the polarization effect depending on these conditions. The optimum conditions were established for each case. The second anodic current density peak and maximum passive current density were designated as the relative corrosion sensitivity$(I_r/I_f)$. The mass transfer coefficient value$(\alpha)$ was determined with the Tafel slope for anodic dissolution based on the polarization effect with optimum conditions.

• 제어로봇시스템학회:학술대회논문집
• /
• 2001.10a
• /
• pp.101.3-101
• /
• 2001

By setting a refractor with a certain angle against the optical axis of the CCD camera lens, the image of a measuring point recorded on the image plane is displaced by the corresponding amounts related to the distance between the camera and the measuring point. When the refractor that keeps the angle against the optical axis is rotated physically at high speed during the exposure of the camera, the image of a measuring point draws an annular streak. Since the size of the annular streak is inversely proportional to the distance between the camera and the measuring point, the 3D position of the measuring point can be obtained by processing the streak. In this paper, for one of the applications of our system, the measurement of a moving surface is introduced. In order to measure the moving surface, multi laser spots are projected on the surface of object. Each position of ...

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2001.05a
• /
• pp.1100-1104
• /
• 2001

This paper introduces experimental results related to the vibration ride conditions that a korean male subject experienced in the railway trains and the express bus. Two types of railway train's, Samaulho and Mugunghwaho, and the express bus were chosen to measure how much the whole-body vibrations of the back, hip and feet are exposes to the subject. Measured vibration signals were analysed to assess the ride conditions quantitatively and qualitatively. Analysed results are illustrated to see how much typical public transportation systems in korea expose vibration to passengers.

• Proceedings of the Korean Society of Toxicology Conference
• /
• 2003.05a
• /
• pp.57-57
• /
• 2003

Epidemiological studies of arsenic have shown that chronic exposure to arsenic can result in an increased incidence of cancer of the lung, skin, bladder and liver. It is impossible that the toxicity study of arsenic in the human, we become to measure in vitro cytotoxicity of inorganic and organic arsenic in the human normal liver cells including Chang Liver and WRL. (omitted)

• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.8 no.6
• /
• pp.78-83
• /
• 1999

This study discusses a non-contact optical technique, electronic speckle pattern interformetry(ESPI), that is well suited for in-plane and out-of-plane deformation measurement. However, the existing ESPI methods that are based on dual-exposure, real-time and time-average method have difficulties for accurate measurement of structure, due to irregular intensity and shake of phase. Therefore, phase shifting method has been proposed in order to solve this problem. About the method, the path of reference light in interferometry is shifted and added to least square fitting method to make the improvement in distinction and precision. This proposed method is applied to measure in -plane displacement that is compared with the previous method. Also, Used as specimen AS4/PE따 [30/=30/90]s was analyzed by ESPI based on real-time to determine the characteristics of vibration under no-load and tension. These results are quantitatively compared with those of FEM analysis inmode shapes.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2000.04a
• /
• pp.344-345
• /
• 2000

인류가 흡연을 시작하면서 담배는 보편적인 사람들의 기호식품으로 이용되기도 했으나, 보건학적으로 인간의 건강을 위협하는 가장 위협적인 존재로 인식되고 있다. 흡연자의 담배연기에 비흡연자가 무저항적으로 노출되는 간접흡연의 문제는 생활수준의 향상과 생활활동 양식의 변화, 건강에 대한 관심의 증대로 현대인들에게 매우 중요한 문제가 되고 있다. 환경중 담배연기(Environmental Tobacco Smoke; ETS)는 흡연자의 입, 비강에서 품어내는 주류연(mainstream smoke)과 담배가 자연 연소되면서 발생하는 부류연(sidestream smoke)이 환경공기 중에 확산된 상태의 담배연기를 일컫는 용어로 실내공기의 주요오염원이다. (중략)

• Journal of the Korea Institute of Building Construction
• /
• v.12 no.2
• /
• pp.183-193
• /
• 2012

Compressive property of high strength concrete with amorphous metal fibers subject to high temperature has been investigated. The measure of this investigation includes explosive spalling, weight loss, residual compressive strength, strain at peak stress, elastic modulus, and residual energy absorption capacity after exposure to $400^{\circ}C$, $600^{\circ}C$and $800^{\circ}C$. In addition to the amorphous metal fiber, two other types of fibers (polypropylene fiber and hooked-end steel fiber) were also included in this investigation for comparison. The experimental program was conducted with high strength concrete using several combinations of the fiber types. The testing result shows that the concrete with amorphous metal fibers plus polypropylene fibers shows a superior behavior than those using other combination or single fiber type ingredient.

• 제어로봇시스템학회:학술대회논문집
• /
• 2000.10a
• /
• pp.302-302
• /
• 2000

This paper presents the measurement and correction of PCB alignment errors for PCB-manufacturing machines. The conventional PCB-manufacturing machine doesn't have enough accuracy to accommodate the demand for high-resolution circuit pattern and high-density mounting capacity of electronic chips. It is because of alignment errors of PCB loaded to the PCB-manufacturing machine. Therefore, this study focuses on the development of the system which is able to measure and correct alignment errors whit high-accuracy. An automatic optical inspection part measures the PCB alignment error using two cameras, and the high-accuracy 3-axis stage makes correct of these error. The operating system is run in the environment of Window 98 (or NT). Finally we implemented this system to PCB screen printer and PCB exposure system.

• Nuclear Engineering and Technology
• /
• v.29 no.3
• /
• pp.211-217
• /
• 1997

Adverse effects caused by the surveillance test for the components of nuclear power plant involve plant transients, unnecessary wear, burden on licensee's time, and the radiation exposure to personnel along with the characteristics of each component. The optimization methodology of STI and AOT has been developed and applied to AFWPs of a reference plant. The approach proposed in this paper consist of the resole in minimal mean unavailability of the two-out-of-four system with adverse effects are analytically calculated for the example system. The surveillance testing strategy are given by the sequential test, the staggered test and the train staggered test which is a mined test scheme. In the system level, the sensitivity analyses for the STI and AOT, are performed for the measure of the system unavailability of the top event in the fault tree developed for the example system. This methodology may contribute to establishing the basis for the risk-based regulations.