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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Safety
Journal Basic Information
Journal DOI :
The Korean Society Safety
Editor in Chief :
Volume & Issues
Volume 17, Issue 4 - Dec 2002
Volume 17, Issue 3 - Sep 2002
Volume 17, Issue 2 - Jun 2002
Volume 17, Issue 1 - Mar 2002
Selecting the target year
An Application of Minimum Strain Energy Density Criterion in Mixed Mode Fatigue Problem
Shim, Kyu-Seok ; Koo, Jae-Mean ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 1~7
In this paper, the maximum minimum strain energy density criterion was applied to the mixed mode fatigue test of A5052 H34 alloy. In this study result we can have seen that the authors stress intensity factor for the finite width specimen and method of determining testing load, based on the plastic zone size and the limited maximum stress intensity factor by ASTM STANDARD E-647-95, is useful.
Free Vibration Analysis of Two Identical Rectangular Plates Coupled with Fluid
Jeong, Kyeong-Hoon ; Lee, Seong-Cheol ; Yoo, Gye-Hyoung ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 8~15
In order to investigate the vibration characteristics of fluid-structure interaction problem, we modeled two identical rectangular plates coupled with fluid. A commercial computer code, ANSYS was used to perform finite element analysis and FEM solutions were compared with the experimental results to verify the finite element model. As a result, comparison of FEM and experiment showed good agreement, and the transverse vibration modes, in-phase and out-of-Phase, were observed alternately in the fluid-coupled system. The effect of fluid gap size on the fluid-coupled natural frequency were investigated. It was shown that the mode numbers increased, the normalized natural frequencies monotonically increased. And it was also found that an increase of the fluid gap reduced the coupled natural frequencies for the in-phase modes but increased the coupled natural frequencies for the out-of phase modes, and eventually converged to the results of an infinite fluid gap.
A Study on Fusion Welding Strength of PE pipe
Jun, Hung-Won ; Kim, Yong-Soo ; Tae, Soon-Ho ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 16~21
At present the Polyethylene piping, on supporting LNG is widely used because of it's disposition which are anti-corrosion flexible and so on. However, it has a few kinds of risk which are the possibility of piping leak, the character of easily corroded and so on. For giving solution, this study is intended to experiment the intension of the PE pipe after melted and when it is melting, the condition which are temperature and pressure is changed. the melting condition in temperature and pressure is adapted identically. After melting, it's joint is tested as intension. The result is that the effect of temperature in intension is more effective than pressure. In
condition, the melting intension has the highest. Compare to the Butt melting joint and the Saddle melting joint, the former was
and the latter was
. It means that the Butt melting method has more intensive than saddle. Consequently, the result shows that the liability and safety when pipe melting method is used will improve in pipe installation.
An Experimental Study on the Deformation Analysis and Automotive Body Repair in Automobile Frame Deformation according to Collision Types
Kwon, Yung-Shin ; Kim, Tae-Hun ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 22~31
In present study, the deformation analysis and automotive body repair were analyzed with respect to collision types by case studies. As a result, lots of data for the automobile frame deformation caused by collision were collected and analyzed according to collision types. It was shown from the result that the frame deformation patterns were able to be roughly grouped by collision positions of vehicles. Repair plans of deformed frames could be carried on the measured data. It was shown that the deformed vehicle frames were sufficienty repaired to be normal in driving characteristics from the performance test of repaired vehicles.
Sensorless Vector Control for Maximum Torque of SynRM in the Field Weakening Region
Lee, Jung-Chul ; Chung, Dong-Hwa ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 32~38
In this paper, a new approach for the SynRM(Synchronous Reluctance Motor) control which ensures producing MTPA(Maximum Torque per Ampere) over the entire field weakening region is presented. In addition, this paper presents a speed sensorless control scheme of SynRM using flux observer. Also, by adjusting the base speed for the field weakening operation according to the flux level, the current and voltage limit, the smooth and precise transition into the field weakening operation can be achieved. The validity of the proposed scheme is verified through simulation.
Thermal Decomposition Characteristics of Azo compounds
Kim, Kwan-Eung ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 39~44
This study was investigated the thermal decomposition characteristics of azo type sponge blowing agent azodicarbonamide(ADCA) using differential scanning calorimeter(DSC). The experimental results showed that the exothermic onset
for ADCA were about
and evolution heats(Q) were about
. The exothermic onset
, exothermic maximum
and exothermic final
were decreased by decreasing particle size of ADCA and evolution heats(Q) were increased with it.
and Q for
ADCA were increased by increasing heating rate at constant sample weight and activation energy was about 37.29kcal/mol. A positive gas pressure was employed in the elucidation of the decomposition behavior of ADCA because it sublimes during linear heating at atmospheric pressure.
and Q of ADCA tended to increase with a pressure in air or nitrogen. In the case of azo dye, experimental results showed that
and Q were about
A Characteristics of Environmental Fraternitive Photopolymerization and Thermal Degradation on Butyl Methacrylate
Choi, Jae-Wook ; Seul, Soo-Duck ; Lee, Nae-Woo ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 45~51
This study is the series of photopolymerization on alkyl methacrylate(AMA) to continue further research. The objective of this work is to investigate the environmental fraternitive characteristics of photopolymerization kinetics on n-Buthyl methacrylate(BMA) and comparing the decomposition behavior to other AMA. The experiment was done in aqueous solution under the influence of photo-initiator concentration
, light intensity
and monomer concentration
. n-BMA was polymerized to high conversion ratio using hydrogen
, and the kinetics model we have obtained is as follows.
The differential method of thermogravimetric analysis(Friedman method) was used to obtain value of activation energy on decomposition reaction. The average value of it was 27.5Kcal/mol.
Stress-Strain Properties of Geosynthetics by Confined Extension Tests
Bang, Yoon-Kyung ; Jeon, Young-Dae ; Lee, Jun-Dae ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 52~57
In this study. stress-strain relationships were investigated by performing the confined extension tests for seven types of geosynthetics such as geotextiles, composite geosynthetics and geogrids. A comparison was made between unconfined and confined moduli for each geosynthetic material to quantify the soil confinement effect on stress-strain properties. A comparison was also made between the increase of moduli at the same strain level with the types of the geosynthetics to demonstrate the different stress-strain responses. Based on the result of the extension tests, the higher the confining stress, the larger the secant modulus of geosynthetics. The secant modulus at 5% strain is twice as much as that of 10% strain, especially there is a noticeable increasing of secant modulus for the two nonwoven geotextiles.
A Study on the Longitudinal Vibration of Finite Elastic Medium using Laboratory Test
Park, Ki-Shik ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 58~62
Longitudinal wave tests with finite elastic medium were performed to investigate the difference between measured values and theoretical values of propagation velocity and elasticity modulus. Each accelerometer was attached on finite elastic medium with same phase and different positions to check the particle motion. The results show that measured values of elasticity moduli from both time domain and frequency domain were similiar to theoretical value. Polarity of signal depends entirely on the phase of accelerometer. It proved that the propagation velocity and the particle motion are in the same direction when a compressive stress is applied. And also the propagation velocity and the particle motion depend on the intensity of the stress and material properties respectively.
Life Cycle Cost Analysis of Steel Bridges on Its Paint System during Safe Life Under
Han, Sang-Chul ; Kim, Eun-Kyum ; Cho, Sun-Kyu ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 63~68
Life Cycle Cost analysis technique is introduced to evaluate cost-effectiveness of two paint systems of steel bridges. The systems are a conventional paint system and a galvanized paint system. The all costs during safe lift such as initial cost repainting costs, disposal costs are considered for the lift cycle cost analysis. The NIST model is used and BridgeLCC 1.0 developed by the NST is utilized as the lift cycle cost analysis tool. It is concluded that, in spite of expensive initial cost, the durable paint system may be cost-effective compared with conventional paint system.
A Study on the Fire Prevention of the Construction Sites
Mok, Yun-Soo ; Chang, Seong-Rok ; Lee, Young-Seob ; Go, Seong-Seok ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 69~75
Current fire safety in the construction sites has developed piecemeal over a considerable period of time. However, the law and regulation of fire safety is insufficient to protect fro in the construction sites. The frequency of fire in the construction sites is very rare but it brings longterm deterioration durability of building structure and large scale industrial calamity. There are many process of works and each work deals with many kind of flammable material, so it is very difficult to find a proper safety fire prevention. This study executed the questionnaire and fire experiment of the welding work to provide effective fire prevention counterplan.
Seismic Behavior of Steel Moment Connections with Different Structural Characteristics
Joh, Chang-Bin ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 76~84
The seismic behaviors of steel moment connections with different structural characteristics are investigated. The rupture index, which represents the fracture potential, is adopted to study the effect of concrete slab and the relative strength between the coin the beam, and Panel zone on the ductility of connections. The results show that the presence of slab increases the beam strength, imposes constraint near the beam top flange, and consequently, induces concentrated deformation near the beam access hall, which reduces the ductility of the connection. The total deformation capacity of the connection depends not only on the beam but also on the column and panel zone. Therefore, the detrimental slab effects and the relative strength should be considered in the seismic design of the connection.
Performance test of Chemical Anchor Bolts for Concrete Repair
Kim, Yon-Gon ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 85~91
A research on the performance of retrofit anchors was conducted using adhesives for rehabilitation. From the pull-out tests of the chemical anchors, the effect of the hole diameter, spacer, temperature, moisture, embedment depth, and aging time were investigated. The spacer did not directly increased the pull-out load hilt increased post-yielding resistance therefore the ductility of the retrofit anchors. When the hole was cleaned and dried after the immersion, the pull-out load was greatly increased compared to the wet hole. A design equation was unposed depending on the embedment depth of the anchor bolt.
Categorization of Motor Operated Valve Safety Significance for Its Periodic Safety Verification
Sung, Tae-Young ; Kim, Kil-Yoo ; Kang, Dae-Il ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 92~99
Safety-related motor operated valve(MOV) safety significance for Ulchin Unit 3 was categorized. The safety evaluation of MOV of domestic nuclear power plants affects the generic data used for the quantification of MOV common cause failure(CCF) events in Ulchin Units 3&4 PSA. Therefore, in this paper, MGL(multiple greek letter)parameter
, used for the evaluation of MOV CCF probabilities in Ulchin Units 3&4 probabilistic safety assessment(PSA), was re-estimated and the MOV safety significance was categorized. The re-estimation results of MGL parameter show that the value of(is decreased by 30% compared with the current value used in Ulchin Unit 3&4 PSA. The categorization results of MOV safety significance using the changed value of MGL parameter(show that the number of HSSCs(high safety significant components) is decreased by 54.5% compared with those using the current value of it used in Ulchin Units 3&4 PSA.
An Examination of a Model for the Relationship between Social Exchange Level(POS and LMX) and Industrial Accidents
Kim, Hyung-Soo ; Yang, Byung-Hwa ; Oah, She-Zeen ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 100~105
This study proposed and examined a model in which perceived organizational support and leader-member exchange are linked to safety communication safety commitment, and accidents. In addition, a moderating effect of role overload in the relationship between safety communication and safety commitment and that of performance monitoring in the relationship between safety commitment to accidents. Data were collected from 193 workers in a railroad company. The results indicated that the goodness of fitness of the proposed model was acceptable. More specifically, both perceived organizational support and leader-member exchange were significantly related to safety communication and safety communication was, in turn, significantly related to safety commitment which was ultimately related to accidents. Also, the moderating effects of both role overload and performance monitoring were found. Implications of these findings for safety and the possible roles of variables in the organizational level are discussed.
Accident Prevention Counterplen of the Elevator for the Passenger
Kwon, Oh-Heon ; Go, Seong-Seok ; Yun, Yu-Seong ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 106~111
Recently the car and elevator accidents as well as the fire, explosion and collapse increased. The passenger elevator accident from 1993 year to 2001 year has about 56.7% of total accidents and the human victims of 180 according to the Korea Elevator Safety Institute. Accident cause and prevention were investigated for the elevator having the fall, impact and narrowness accident types. The prevention and protection methods of the elevator accident from analysis results were suggested by comparing and analogizing the accident statistics about the accident investigation of the passenger elevator according to the elevator accidents.
Investigation of Effects of Shield Gas on Counterflow Flame Structure
Park, Woe-Chul ;
Journal of the Korean Society of Safety , volume 17, issue 2, 2002, Pages 112~117
The effects of shield gas on the structure of methane-air nonpremixed counterflow flames were numerically investigated. The near extinction flame of a low global strain rate 20
of 19% methane diluted by 81% nitrogen by volume and undiluted air was computed. The flame shape, centerline temperature and axial velocity profiles were compared for different velocity of the shield gas and with and without the shield gas. The effects of the velocity of the shield gas were negligible for
in normal gravity. Under normal gravity conditions, the flame shape and its position with the shield gas were different from those of the flame without the shield gas, whereas no discernible effects of the shield gas along the centerline were observed in zero gravity.