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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Safety
Journal Basic Information
Journal DOI :
The Korean Society Safety
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Volume & Issues
Volume 7, Issue 4 - Dec 1992
Volume 7, Issue 3 - Sep 1992
Volume 7, Issue 2 - Jun 1992
Volume 7, Issue 1 - Mar 1992
Selecting the target year
Establishment of Zero-Accident Goal Period Based on Time Series Analysis of Accident Tendency
Journal of the Korean Society of Safety , volume 7, issue 2, 1992, Pages 5~13
If zero-accident movement is to be successful, the objective goal period should be surely obtainable, and much more in our country where frequency rate of injury are remarkably fluc-tuating. However In our country, as far as we know, no method to establish a reasonable zero-accident goal period is guaranteed. In thls paper, a new establishing-method of reasonable goal period for individual industry with considering recent accident trend is presented. A mathematical model for industrial accidents generation was analyzed, and a stochastic process model for the accident generation inteual was formulated. This model could tell the accident generation rate in future by understanding the accident tendency through the time-series analysis and search for the distribution of numbers of accidents and accident interval. On the basis of this, the forecasting method of goal achievement probability by the size and the establishment method of reasonable goal period were developed.
A SHdy on the Development of an Expert System for Chemical Plant Diagnosis Fault -An Object Description System based on Functional Structure-
Journal of the Korean Society of Safety , volume 7, issue 2, 1992, Pages 14~23
A methodology for developing an object description system based on functional-structure of chemical plant is proposed. A knowledge base for chemical plant fault diagnosis is also organized in a generic fashion using the heuristic knowledge of human operators. A plant can be seen as a hierarchical set of subsystems. Each subsystem is called a SCOPE. The state of the plant and the behavior of each subsystem is managed by the SCOPES. A computer-based system based on thls methodology and knowledge base has been developed and applied to the subprocess of ethylene plant to evaluate the effectiveness of the methodology.
Study on Effective Treatment of Waste Gases in Chung-Ju Industrial Complex with Polymeric Absorbent( I )
Journal of the Korean Society of Safety , volume 7, issue 2, 1992, Pages 24~29
The exhausted gases were analyzed and the countermeasures were studied to solve the environmental pollution caused by waste gases in Chung-Ju Industral Complex. The eleven working places were selected to analysis the compositions and concentrations of the exhausted gases by gas chromatograph and membrane method. The five companies which have used organic solvents were shown lower content than TLV and the environmental limits. But the concentration of lead in a electric product company was revealed higher than TLV. The waste gases of the four companies which have used asbestos were shown lower values than TLV and the environmental limit. The exhausted gases, SO
of two companies which have used fossile fuels were also analyzed. The NO
concentration of one company which haven't disposal system was shown higher than the environmental limit.
Analysis of Dynamic Characteristics of Rectangular Plates by Finite Element Method
Journal of the Korean Society of Safety , volume 7, issue 2, 1992, Pages 30~41
Analysis of Dynamic Characterisocs of Rectangular Plate by Finite Element Method. Dynamic characteristics of a rectangular plate with opening in it is studied by finite element method. To investigate these characteristics 12 degrees of freedom membrane finite element in used. The rectangular membrane finite elements are defined by specifying geometry, internal displacement functions and strain-displacement relations. Then, the governing equation for the finite element is derived by energy method. To derive the mass matrix and stiffness matrix of the element, expressions for strain and kineic energy in terms of the node displacement are generated. In constructing the overall structure matrix, the matrix of each elements are superposed and partitioned by applying the given boundary condition to obtain a nonslngular matrix. To find the natural freguencies and viration modes, the eigen values and the corresponding eigen vectors are computed by the computer using well known Jacobi power method. In order to verify the capability of the membrane finite element, a flat rectangular plate is analyzed first, and the result is compared with well known analytical results to show the good agreement. A rectangular plate with opening in It is analyzed with the same finite element. The results are presented in this paper. Unfortunately, the literature study could not provide with some results to compare, but the results reveal that the output of this research is phlslcally reasonable. And the results of this research are useful not only in practice but also for the future experimental research in comparison purpose.
Reducing the Axial Thrust of the Submersible Motor Pump
Journal of the Korean Society of Safety , volume 7, issue 2, 1992, Pages 42~46
The submersible motor pump could have much more merits than the general pump such as higher exhaustion head, narrower installahon place, lower noise due to operating in the water and so on. But, so far, hydraulic mechanism of the axial thrust at impeller was not analysed quantitatively and so it is very difficult to solve the occuring problems. Therefore, in this study, we aimed to minimize the axial thrust acting on thrust bearing of submersible motor pump through the analysis of hydraulic mechanism of thrust and design rivision of impeller. Test carried out on the pump with an impeller 92mm in diameter, 6 balacing holes 10mm in diameter, showed the thrust is reduced by about 86％ at the normal operating point.
An evaluation of Fatigue Crack Propagation Behaviors on Cyclic Overload Test
Journal of the Korean Society of Safety , volume 7, issue 2, 1992, Pages 47~56
The retardation effect of fatigue crack propagation after cyclic overloading seems to be affected by strain hardening exponent. Namely, for the material with high values of n, the delay effect is found to be severe. We proposed a modified crack retardation equation which may apply the retardation of fatigue crack growth after a cyclic overloading, as (da/dN)'
is effective stress ratio [＝(
)] The constants
＝－0.5 and λ＝0.6, and the values are found to be identical for materials such as aluminum (A 1060), steel (SS 34), brass (
SIB) and stainless steel (SUS 304) used in this investigation. (SUS 304) used in this investigation.ation.n.n.
A study on the Corona Electrification Phenomena for Polyvinyl chloride (PVC)
Journal of the Korean Society of Safety , volume 7, issue 2, 1992, Pages 57~62
In this thesis, the electrification phenomenon was studied by measurement of charging current and discharging current in polymers when the carriers generated by corona discharge were supplied to the surface of polymers. Corona charging current of PVC, polar and noncrystalline polymer, was larger than that of nonpolar and amorphous polymers. Corona charging current on the specimen of naked upper surface (CIM) was larger than charging current on the specimen of electrode made. Carrier injection differed from interfacial phase of polymer surFace. The transfer phenomenon vaned with chemical structure of polymer and then the polar effect of PVC was remarkable because of large electron affinity of Cl. In the characteristics of discharging current of PVC, the abnormal current was observed. It was supposed that this phenomena presented the trap of injected carriers in PVC and that static electricity phenomenon was generated by trap.
Noncondensable gas's influence in waster vapor absorption accompanying interfacial disturbance into aqueous solution of LiBr
Dong-Ho RIE ; Keun-Oh Lee ;
Journal of the Korean Society of Safety , volume 7, issue 2, 1992, Pages 63~70
The aim of this research is to obtain a basic quantitative understanding of the effect of a noncondensable gas on the absorption of water vapor by a
/ LiBr combination with n-octanol as the surfactant. Nonflowing aqueous solutions of LiBr (40,45,50 mass％) were exposed to saturated water vapor following the addition of an n-octanol sufactant (0.01 and 0.6 mass％). A small amount of a noncondensable gas (air) was allowed into the absorber (0.03 volume％) and its effect was analyzed by measuring the amount of water vapor absorbed. This study will aid to predict the performance of heat pump and safety operating condition when the noncondensable gas is not allowed in the absorber The results indicate that, in the presence of small amounts of a noncondensable gas, vapor absorption enhancement ratios are less than half o( those obtained under the same experimental conditions when a noncondensable gas is not present (1). The presence of a noncondensable gas causes the partial vapor pressure of air to increase at the vapor / liquid interface, which results in an instability of vapor absorption rate nd. hence, in an inhibition of interfacial disturbance.
An Identification of Dynamic Characteristics by Spectral Analysis Technique of Linear Autoregressive Model Using Lattice Filter
Journal of the Korean Society of Safety , volume 7, issue 2, 1992, Pages 71~79
This paper presents a least-square algorithms of lattice structures and their use for adaptive prediction of time series generated from the dynamic system. As the view point of adaptive prediction, a new method of Identification of dynamic characteristics by means of estimating the parameters of linear auto regressive model is proposed. The fast convergence of adaptive lattice algorithms is seen to be due to the orthogonalization and decoupling properties of the lattice. The superiority of the least-square lattice is verified by computer simulation, then predictor coefficients are computed from the linear sequential time data. For the application to the dynamic characteristic analysis of unknown system, the transfer function of ideal system represented in frquency domain and the estimated one obtained by predicted coefficients are compared. Using the proposed method, the damping ratio and the natural frequency of a dynamic structure subjected to random excitations can be estimated. It is expected that this method will be widely applicable to other technical dynamic problem in which estimation of damping ratio and fundamental vibration modes are required.