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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
Editor in Chief :
Volume & Issues
Volume 16, Issue 4 - Dec 2001
Volume 16, Issue 3 - Sep 2001
Volume 16, Issue 2 - Jun 2001
Volume 16, Issue 1 - Mar 2001
Selecting the target year
Evaluation for Fracture Toughness with Considering the Thermal Energy
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 1~6
In the case of a crack propagation a portion of the work of inelastic deformation near the crack tip is dissipated as heat. In order to understand the thermal effect on fracture toughness, tensile tests were carried out using thermocouples to monitor the variation of temperature. The experimental results show that the temperature of specimen was increased
at static load condition. And the thermal effect is investigated connected with the steady-state stress in the vicinity of a crack propagation in the elastic-plastic C-T specimen theoretically. And fracture toughness, the energy to make crack surfaces, presented correctively. The fracture toughness with considering heat at the blunting of the crack tip is lower about 16.9％ than that of ignoring heat. So, it is resonable to apply the fracture toughness with considering thermal energy and it would be good explanation for constraint effect depending on the configuration in the presence of excessive plasticity.
A Numerical Study on Temperature Distribution on Ceiling for Different Locations and Sizes of the Outflow Opening
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 7~12
The finite volume method was utilized for computation of convection heat transfer in a two-dimensional enclosure with an inflow opening and an outflow opening. The objective of this study is to investigate temperature distribution on ceiling for different locations and sizes of the outflow opening. The inflow opening was set to be H
=0 and U=50. The results fur different sizes of the opening H
=0.1, 0.2, 0.3, and 0.4 shooed similar flow patterns and temperature distribution. Location of the outflow opening, however, influenced significantly on the temperature distribution on the ceiling.ing.
The Study on Characteristics of Water Spray and Droplet from Fire Sprinkler Head
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 13~21
The effect of water spray for the fire sprinkler depends on droples distribution over maximum possible floor area. The present study are carried out for the characteristics of water spray and droplets experimentally and numerically km two fire sprinkler heads which are CHM head and CHl heal CHl head is self-production and CHl head is widely used up to date. As the result of using CHM head, water spray and droplets are distributed over large area because CHM head has smooth surface and non-flamed shape. When the pressure of fire sprinkler head is low, SMD(sauter mean diameter) is large and when the pressure of fire sprinkler head is high, SMD is small.
Prediction of Chip Formation Mechanism Using Acoustic Emission
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 22~26
The machining process on be considered as a planned interaction of the workpiece, the tool and the machine tool. In an unmanned situation, the results of this interaction are to be continuously monitored so that any changes in the machining environment on be sensed to corrective actions. In order to design the process monitoring system for unmanned manufacturing, the identification of chip formation is proposed. The system proposes the method of using acoustic emission(AE) signal analysis to identify the chip formation during cutting.
A Study of Fatigue Strength Improvement for Cr-Mo Steel in Long Term service
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 27~35
For the purpose of healing the degradation part,
laser beam was irradiated with different irradiation condition (porer, diameter, velocity and beam type) to find out optimum irradiation condition. The test series of hardness, residual stress measurement, and fatigue were carried out after the irradiation. Experimental results show that micro-hardness values on the surface of the irradiated specimens m approximately 2.5 times higher than those of un-irradiated ones. Fatigue tests show that the fatigue life was improved by the compressive residual stress after laser beam irradiation. However, some specimens with different conditions show the shorter fatigue life. It means that laser beam irradiation with optimum irradiation condition and optimum absorb energy, Q can improve the fatigue strength.
The Evaluation of Influence on the Life Cycle of Electro Sensitive Protective Equipment in Press
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 36~43
This study is intended to estimate influences upon life cycle of ESPE(Electro Sensitive Protective Equipment) which is kinds of commonly used in press in domestic industry. First the field survey is executed to workers and safety managers at work places. In the survey, the main primary factors influenced the lift cycle of ESPE were vibration due to overload work in workplace. Second, int results showed that 37
acceleration in press work would lead to the life of 132 for 8 hours work per day. Therefore, the vibration of press inflicted significant effect on the lift of ESPE.
Influence of Notch Change on Corrosion Fatigue Fracture in F.E.M. Dual phase Steel of SS41 Steel
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 44~50
The rotated bending fatigue test was conducted in air md in 3.5% NaCl salt solution to investigate the fatigue fracture behaviour of raw material and F.E.M dual phase steel made from raw material(SS41) by a suitable heat treatment. This study has compared the initial microcrack creation of material by tensile test with that by fatigue test. And the rotated bending test of cantilever type under the condition of 3.5% NaCl salt solution and air has investigated the corrosion fatigue fracture behaviour with the variation of stress concentration factor determined by each of notch shapes. The initial microcrack have been developed in fragile grainboundary with general corrosion occurring in raw material : in the pits built up by corrosion in F.E.M. dual phase steel because pits bring out stress concentration. It is small that the degree of decrease in corrosion fatigue life for F.E.M. dual phase steel compared with raw material because the notch sensitivity of F.E.M. dual phase steel is lower than raw material in reason of characteristics with two-phase construction.
Efficiency Optimization Control for High Performance Operation of Synchronous Reluctance Motor
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 51~56
This paper is proposed an efficiency optimization control algorithm for a synchronous reluctance motor (SynRM) which minimizes the copper and iron losses. fen exists a variety of combinations of d and q-axis current which provide a specific motor torque. The objective of the efficiency optimization controller is to seek a combination of d and q-axis current components, which provides minimum losses at a certain operating point in steady state. It is shown that the current components which directly govern the torque production have been very well regulated by the efficiency optimization control scheme. The proposed algorithm allows the electromagnetic losses in variable speed and torque drives to be reduced while keeping good torque control dynamics. Simulation results are presented to show the validity of the proposed algorithm.
An Analysis of Damage Mechanism of Semiconductor Devices by ESD Using Field-induced Charged Device Model
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 57~62
In order to analyze the mechanism of semiconductor device damages by ESD, this paper adopts a new charged-device model(CDM), field-induced charged nudel(FCDM), simulator that is suitable for rapid routine testing of semiconductor devices and provides a fast and inexpensive test that faithfully represents ESD hazards in plants. The high voltage applied to the device under test is raised by the fie]d of non-contacting electrodes in the FCDM simulator. which avoids premature device stressing and permits a faster test cycle. Discharge current md time are measured and calculated The FCDM simulator places the device at a huh voltage without transferring charge to it, by using a non-contacting electrode. The only charge transfer in the FCMD simulator happens during the discharge. This paper examine the field charging mechanism, measure device thresholds, and analyze failure modes. The FCDM simulator provides a Int and inexpensive test that faithfully represents factory ESD hazards. The damaged devices obtained in the simulator are analyzed and evaluated by SEM Also the results in this paper can be used for to prevent semiconductor devices from ESD hazards.
Development of Program for Estimation of Direct or Indirect Loss Cost Due to Industrial Disaster
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 63~68
In this study the main elements which can be commonly adopted to every kind of business are selected through the research, case-study, benchmarking common items of a direct or indirect loss cost. As a result of the development of a program for evaluating loss cost a case or accumulated data can be easily managed through estimating the direct and indirect loss cost as tell as the ratio between directs and indirect cost. The program is fit to case-study and we are compared direct cost with indirect cost. Automatically, this program showed ratio between directs and indirect cost for style, scale of accident The person in charge of safety and hygiene can have better chances to get into management also the owner or the CEO can recognize the importance of management of safety and hygiene. So this can guide the company to invest in a prevention of disaster and to adopt a safety and hygiene management promote the prevention activity of a company, and finally decrease the accident rate in the country.
Development of Emergency Response Plan System Using Quantitative Risk Assessment in Chemical Plants
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 69~74
In this study, we analyzed the accident scenarios of chemical plants through the analysis of lots of chemical accidents and using experts knowledge, and looked into the method of prevention and response. Moreover, we developed a systemic and actual Emergency Response Plan Software(ERPS) that could prevent, prepare and respond totally for the chemical industry facilities using the data from the accident effect estimation from the local society and the geographic information of a chemical plant. The ERPS consists of the information for the plant and process, the consequence analysis and the ERPTA(Emergency Response Plan Tree Analysis). In conclusion, the program developed in this study could help effectively all the chemical industry facilities to prevent and respond to possible accidents.
A Study on the Thermal Decomposition Characteristics of Nitrophenylhydrazine
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 75~79
For handling and storage of reactive chemicals, the hazard evaluations have been extremely important. In the chemical industry, the most concerns are focused on the thermal harzards such as runaway reactions and thermal decompositions, which are mostly governed by thermodynamics and reaction kinetics or these reactive chemical in the system. This study no investigated the thermal decomposition characteristics of nitrophenylhydrazine isomers by using differential scanning calorimeter(DSC) and accelerating rate calorimeter(ARC). Experimental results showed that exothermic onset-temperatures in nitrophenylhydrazine(NPH) isomers were about 160-
by DSC and 100-
by ARC. The decomposition temperature acquired by ARC was about 50-
lower than that by DSC. Reaction heats were about 40-100cal/g by DSC and 330-750ca1/g by ARC. While ortho isomer of NPH show two distinct exothermic peaks, para isomer shows a single peak in DSC curves. The first exothermic peak for 2-NPH is mainly due to intramolecular dehydration forming 1-hydroxybenzotriazole(HOBT) and the second exothermic peak is mainly due to the decomposition of HOBT formed in the first step of decomposition. The exothermin peak in the DSC curve for 4-NPH is mainly due to dissociation of hydrazino and nitro groups.
An Experimental Study on the Correlationship Between Highrised Safetyguard and Workers' Safety
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 80~84
Work stress and health are very important factors related to workers' condition and work safety, Author has conducted a couple of tests to check up three people's pulses before they work during their work for three types of safety guard in construction site. Work type, age, weight, sex experience year, ambient temperature n recorded as variables in this study. These are checked and asked by the author directly, before their pulse check Also, workers' Pulses were measured at height H-0 and H-9.0m to understand psychological the degree of psychological nervousness degree. POLAR protrainer NVTM HRM system(wrist recorder and sensor) was used for the site test. There are three(3) different types of construction safety guard which have been used for, this study. They are usually or frequently used and found in the site. Four different ranges of age groups(20's, 30's 40's, 50's) carpenters are assisted to the test sites with wearing pulse recorder and sensor respectively. All three types of safety guards have the same height 90㎝ even though they are different types. On top of five(5) stories tublar framed scaffolding is fabricated, similar to the one in site, where those safety guards are installed. The older(=more experienced) the workers are the more stable they are. it is shown. Also, It is verified the visually uncomfortable rail type can cause workers to psychologically be unstable.
The Origins of Fall Incidents in Construction Sites Classified by Locations and Trades of Concern
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 85~90
In construction industries, the problem areas in safety are different to those of manufacturing. For instance, construction safety efforts must strongly emphasize fall prevention, whereas caught-in/ between incidents and electrical shocks are common in manufacturing. This paper reports an analysis of fall incidents that lead to fatalities in 1999 and in 2000. It also provides a safety plan for fall prevention by analyzing the origins of fall incidents by their trades and locations of concern. The findings of this study are expected to contribute toward reducing fall incidents in construction industry.
The Structural Analysis of Corrugated Polyethylene-Plastic Form Panel and Concrete of Composite System
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 91~96
Theoretical definitions of mixed behavior of PE panel and connote should have preceded to cause a mixed behavior of connote and polyethylene which have different elastic module, one-line expansion coefficients, poison ratios, compressive strengths and tensile strengths. Consequently, changes are analyzed through experiment process to identify the effects on interpretation of mixed behavior on the basis of temperature change of structures, temperature rise of concrete other than PE panel due to hydration heat temperature rise of concrete other than PE panel due to drying and contraction, working of hydrostatic pressure by storage and temperature gradient From the results of interpretation of the analysis, it is concluded that PE panel have slight influences on the change of guess of structures and maintains structural stability compared with concrete structures without PE panel.
An Experimental Study on Suction Force of Plate Anchor Embedded in Bentonite
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 97~102
Anchors are often used in construction of foundations such as transmission towers to resist uplifting forces. When plate anchors are embedded in soft clay, they may undergo a deformation under the pressure of sustained load. In soft saturated clays, the suction force can be a large par of the ultimate uplift capacity. This study is to present recent laboratory model test results conducted to evaluate the nature of variation of the suction force for plate anchors with shear strength and embedment ratio. The ratio of F
versus H/D in bentonite decreases with the increase of the embedment ratio.o.o.
A Study on the Non-Insurance Cost due to the Industrial Accident - On the focus of the Ulsan area cooperation -
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 103~109
When workers get accidents in doing their works, industrial accident insurance covers the compensation for the accidents. Generally, this kind of costs is applied in terms of Direct Cost. In our society circumstance to terminate the accident, many kinds of cost (Non-Insurance Cost) are also discharged. Non-Insurance Cost resulted from additional compensation for insurance allowance, is the important basic data source to estimate Loss Cost. Several studies have been done for the output of accident cost, but companies have difficult to apply these studies into practice and generalize the amount of accident loss cost. This study means to suggest improving solutions for the output of Accident Loss Cost and to reduce Opportunity Cost caused by Industrial Accident.
A Study on Maintenance Rule for the Maintenance Effectiveness Monitoring
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 110~116
The objective of the Maintenance Rule (MR) is to require monitoring of the overall continuing effectiveness of licensee maintenance programs to ensure that the safety related and certain nonsafety-related SSCs are capable of performing their intended functions. In Korea, as risk informed applications and regulation become active, the necessity of Performance Based Regulation (PBR) has increased. The objective of this article is to study the effectiveness of MR based on performance and feasibility of MR adoption at Korean Nuclear Power Plants (NPPs) for effective maintenance and regulation.
A Study on the Muscle Activity During Asymmetric Load Handling
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 117~120
Low back pain has been known as the most frequent musuculoskeletal disorders in modern industrial society and cost by low back pain is increasing mon and more. The asymmetric lifting has been identified as a major risk factor of low back pain. In this study, the muscle activity and muscle exertion level during asymmetric load handling (without trunk flexion) was estimated. The results of normalized MVC measurement were decreased about 16％, 24％, 34％ respectively as the asymmetric angle was
. From the results of EMG measurement contralateral muscles were more active than ipsilateral muscles. RMSEMG values of right erector spinae muscles were decreased as the work posture went to 90
and those of left erector spinae muscles were increased until the asymmetric angle was 40
but decreased continually over 40
. And for seven of subjects, activities of left and right latissimus dorsi muscles were maintained constantly, while for remainer, those were irregular.
Optical Temperature Sensor Based on the Etched Planar Waveguide Bragg Grating Considering Linear Thermo-optic Effect
Kook-Chan Ahn ; Sang-Mae Lee ;
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 121~129
This paper demonstrates the development of optical temperature sensor based on the etched planar waveguide Bragg grating. Topics include design and fabrication of the etched planar waveguide Bragg grating, investigation of the grating reflection characteristics, and temperature measurement capabilities. The typical bandwidth and reflectivity of the surface etched grating has been ~0.2nm and ~7%, respectively, at a wavelength of ～1552nm. The temperature-induced wavelength change of the optical sensor is found to be slightly non-linear over ～20
temperature range. Theoretical models for the grating response of the sensor based on waveguide and plate deformation theories agree with experiments to within acceptable tolerance.
Rail-Structure Interaction Analysis for Simple Span Bridges of the Taiwan High Speed Railway
Yong-Gil Kim ;
Journal of the Korean Society of Safety , volume 16, issue 2, 2001, Pages 130~135
The additional stresses and displacements produced by the use of long rail, typical of the high-speed railway, are investigated for the Taiwan high-speed railway bridges. In addition, an important special feature of the Taiwan high Speed Railway Design Specifications specifies that service earthquake has to be considered during the rail-structure interaction analysis before evaluating the stresses and relative displacements of the bridge. As pound motion is taken into account under seismic event the seismic response of the structure is applied as displacement in the rail-structure interaction analysis. The stresses and relative displacements of the structure are checked according to the consideration of seismic loading.