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진동형 분진 최소착화에너지측정장치에서 분진 응집현상이 미치는 영향
정재희,최충석,목연수,최광석,황명환,우인성,Yamaguma, M.,Kodama, T.,Cheung, W.L. 한국산업안전학회 1999 한국안전학회지 Vol.14 No.3
It is widely recognized that Hartmann tube for measuring the minimum ignition energy(MIE) of powder. But It requires long time and operational skills for measuring. As a variety of new fine powders are being produced day by day in industry, Japen has been developing a measurement system which employs a new method to create a dust/air mixture in a miniature combustion box. In this system, by vibration, the powder is successively fed downward through a hopper made up of metal mesh, and then it is formed into a thin, certain-like, dust/air mixture. With this new apparatus, three types of powder-Lycopodium, Anthraquinone, and Polyacrylonitrile-were tested and the data of MIE were compared with those of a conventional apparatus (the Hartmann tube). Two of them agreed satisfactory, but the other, Anthraquinone, showed quite different values. It is guessed that the agglomerations of the powder particles appear because of particle shapes, static-charge and humidity.
저압용 누전차단기의 차단특성 및 그라파이트 분석에 관한 연구
정재희,이덕출,이경섭,최충석,박수홍,김병수 한국산업안전학회 1999 한국안전학회지 Vol.14 No.1
In this paper, we studied cut off characteristics and fire hazard of residual current protective devices(RCD or ELB) for low voltage. The operative time of RCD with grounding resistance was analyzed by using RCD operating tester. The surface structure and composition of insulator were analyzed by using scanning electron microscope(SEM) and energy dispersive x-ray spectroscopy(EDX). The surface of phenol resin showed network structure and void. The spectra shown in EDX analysis are composed not only of the corresponding elements but also of several new spectra, as CK, OKα , MgK, SiK, and CaK, which were absent in original material.
EPS 공정의 정량적 위험성 평가를 통한 안전의사결정에 관한 연구
정재희,김형석,최광석,이영순 한국산업안전학회 1999 한국안전학회지 Vol.14 No.2
The quantitative risk assessment and consequence analysis by accident scenario in the process of EPS(Expendable Poly Stylene) reaction process are conducted. And the decision making process is studied followed by selecting various alternatives to safety management and facility improvement. The result are as follows; 1) The object of decision making through comprehensive risk assessment are the scenario which can cause four major accident, which are made by process analysis, work analysis and hazard identification. 2) Frequency analysis of ETA, FTA, HRA and consequence analysis of accident to each have been conducted. The each frequency values are yielded 9.2×10^(-5)/yr to scenarios 1, 8.2×10^(-4)/yr to scenario 2, 4.5×10^(-6)/yr scenario 3 and 1.8×10^(-7)/yr to scenario 4. The each scenarios have been conducted consequence analysis. 3) The calculated values have been obtained 4.00 to scenario 1, 3.25 to scenario 2, 2.43 to scenario 3 and 1.34 to scenario 4, as the weight value had been applied to the quantitative and normalized criteria of all components. As a risk criteria, scenario 1 have been selected, which is the most dangerous scenario as a result of ranking the scenario. 4) According to the importance of FTA and contribute to scenario 1, the cost-benefit values are yielded 8.05×10^5[₩/yr] to final alternative(A1), 1.55×10^5[₩/yr] to final alternative(A2) and 2.32×10^5[₩/yr] to final alternative(A3). As a result of final alternative(A1) has been selected, which is the most optimized alternative.
코로나 대전된 복합절연재료의 표면상태가 전위감소에 미치는 영향
황명환,정재희,조한구,송진호,이덕출 한국산업안전학회 1997 한국안전학회지 Vol.12 No.2
Especially, Fiber glass Reinforced Plastics(FRP) is the best composite insulating material which has been so far. Therefore, it's worthy of notice to investigate on the corona electrified composite insulating material by surface condition. And then some other materials will be focussed on. In this study, charge decay were measured with charging-time and grid voltage on FRP composite material surface in order to analyze the mechanism. As a result we have studied that the way of the composite glass fiber(GF) and Polymer and the condition of the contaminated surface was different. In case of the GF is mixed with vertical, charge decay speed is fast because the charge is easily leaked. On the other hand, the surface charge decay speed is depend on conductive or insulated of the contaminant.
이덕출,장영민,정재희,이관형,차영식,정춘기 한국산업안전학회 1995 한국안전학회지 Vol.10 No.1
There are many methods to move or reduce the static electricity which often causes disasters in industry, etc. The methods may include grounding of a potentially-charged body, use of antistatic materials, humidification of an atmosphere, use of static electricity eliminators. Among those methods, the one utilizing antistatic materials is widely used in the industrial fields due to its effectiveness and inexpectiveness. In Korea, safety regulations and technical standards are not sufficient for applying to industrial fields as electrostatic disaster prevention measures due to the shortage of practically verified and reliable data. The propose of this paper is to examine the electrostatic characteristics of the antistatic materials and non-antistatic ordinary materials under the various conditions of different temperature and humidity.