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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 18, Issue 4 - Dec 2003
Volume 18, Issue 3 - Sep 2003
Volume 18, Issue 2 - Jun 2003
Volume 18, Issue 1 - Mar 2003
Selecting the target year
Axial Impact Collapse Analysis on Front-End Side Members of Vehicles by FEM
Cha Cheon-Seok ; Chung Jin-Oh ; Yang In-Young ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 1~7
The front-end side members of vehicles(spot welded hat and double hat shaped section members) absorb most of the impact energy in a case of front-end collision. In this paper, specimens with various spot weld pitches have been tested with a high impact velocity of 7.19m/sec(impact energy of 1034J). The axial impact collapse simulation on the sections has been carried out to review the collapse characteristics of these sections, using an explicit finite element code, LS-DYNA3D. Comparing the results with experiments, the simulation has been verified; the energy absorbing capacity is analyzed and an analysis method is suggested to obtain exact collapse loads and deformation collapse modes.
Strength Prediction of Bolted Woven Composite Joint Using Characteristic Length
Park Seung-Bum ; Byun, Joon-Hyung ; Ahn, Kook-Chan ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 8~15
A study on predicting the joint strength of mechanically fastened woven glass/epoxy composite has been performed. An experimental and numerical study were carried out to determine the characteristic length and joint strength of composite joint. The characteristic lengths for tension and compression were determined from the tensile and compressive test with a hole respectively. The characteristic lengths were evaluated by applying the point stress failure criterion to a specimen containing a hole at the center subjected to tensile loading and a specimen containing a half circular notch at the center subjected to compressive load. The joint strength was evaluated by the Tsai-Wu and Yamada-Sun failure criterion on the characteristic curve. The predicted results of the joint strength were compared with experimental results.
Analysis of Burst Pressure for Wear-Damaged Steam Generator Tubes
Shin, Kyu-In ; Park, Jai-Hak ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 16~22
Generally the rupture of steam generator tubes proceeds from significant plastic deformation before failure. In this study, the burst pressures of damaged steam generator tubes were calculated from the plastic instability analysis with the finite element method. Two wear types, flat and circumferential types were considered. An equation for the burst pressure was proposed by using the strength reduction factor and the Svensson equation. The analysis results were compared with the experiment data from published references and they showed a good agreement with the experiment data.
The Development of Camera Detection System for the Measurement Road Traffic Data
Kim, Hie-Sik ; Kim, Jin-Man ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 23~27
To improve the road transportation safety, the road traffic data is monitored by applying an image detection system. The road traffic safety is analysed using image processing techniques. For more accurate measurement, the coordinate matching of real road data to image is one of the most essential parts of the image detection technique. The road image is skewed at the input screen, because the video camera is installed at the roadside. A fast and precise algorithm for the coordinate matching is developed to convert image coordinates into road coordinates.
An Evaluation of the Effect of Internal Thinning Defect on the Failure Pressure of Elbow
Kim, Jin-Weon ; Kim, Tae-Soon ; Park, Chi-Yong ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 28~34
In the present study, three-dimensional finite element analysis was performed to investigate the effects of internal wall thinning defect on the failure pressure of elbow in the piping system and to develop the failure pressure evaluation model. From the results of finite element analysis, the failure pressure was derived by employing local stress criteria, and the effects of thinning location, bend radius, and defect geometry on the failure pressure of internally wall thinned elbow were investigated. Also, based on these investigations and previous model developed to estimate the failure pressure of elbow with an external pitting defect, the failure pressure evaluation model to be applicable to the elbow containing an internal thinning defect was proposed and compared with the results of finite element analysis. The failure pressure calculated by the model agreed well with the results of finite element analysis.
Evaluation of Replace period and Useful lifetime of the wire ropes for the Passenger's Elevator
Son, Doo-Ik ; Park, Jae-Suk ; Oh, Hwan-Seop ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 35~38
The wire rope, one of the component of the elevator, is extremely important for the sage operation of the elevator. That is why the wire rope is replaced at a specific interval regradless of the operating conditions or the degree of damage to prevent the breakage of the wire rope. This is the waste of resources, causing economic and environmental loss. This paper has surveyed and analyzed and analyzed the status of replacing wire-rope by buildings that use elevators, in order to compare the replacement cycles of the wire rope under each operating conditions.
Fracture Behavior of Ceramic Coatings Subjected to Thermal Shock
Han, Ji-Won ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 39~43
An experimental study was conducted to develop and understanding of fracture behavior of ceramic thermal barrier coating when subjected to a thermal shock loading. The thermal loading was applied using a 1.5kW
laser. In the experiments, beam-shaped specimens were subjected to a high heat flux for 4sec and cooling of 7sec in air. The interface crack length was increased as the crack density, the surface pre-crack legth and the coating thickness were increased. The center surface crack length was increased as the maximum surface temperature got higher and the surface pre-crack length for shorter.
A Study on Technology for Involute Bevel Gear Design
Cho, Seong-Cheol ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 44~50
Design method for involute bevel gears is developed. The developed gear design system can design the optimized gear that minimize the number of pinion teeth with face tooth. Method of optimization is MS(matrix search) which is developed from this study. Design variables are pressure angle 20., transmitted power, gear volume, gear ratio, allowable contact stress and allowable bending stress. etc. Gears design method developed this study can be applied to the plane, helicopter, printer, machine tools.
An Experimental Study on Decrease of Noise for Air Nozzle
Jeon, Seoung-Tae ; Kim, Jong-Hyun ; Lee, Keun-Oh ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 51~56
The goal of this study is to show the way to decrease the noise from air nozzles. The variables of this test are the shapes of air nozzles, air flow rate and the distance between a reflection plate and a nozzle tip. This experiment is aimed to find the most appropriate condition to minimize the noise. These are the results. If diameter ratio is more than 12:8, noise level increases by over 10 dB(A) regradless of the distance between a reflection plate and a nozzle and the existence of a reflection plate. And when
of a nozzle is 5mm long, noise level rise relatively highly. So, it is strongly recommended that
should be manufactured more than 10mm. The reason for a high intensity noise is that when diameter ratio is more than 12:8, the diameter of a nozzle tip(
) turns small drastically, which increases the air velocity. It is assumed that when the vortes is great around the spots where a nozzle hole is suddenly smaller, great turbulent flow increases much noise.
A Study on Thermal Degradation of Acrylonitrile Butadiene Rubber
Kim, Ki-Yup ; Kang, Hyun-Koo ; Lee, Chung ; Ryu, Boo-Hyung ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 57~63
Thermal degradation of Acrylonitrile butadiene rubber(NBR), which is used for O-ring material as elastomeric sealed diaphragm value in the nuclear power plants, is examined. The thermal degradation is accelerated at 130
by Arrhenius exploit method using the activation energy calculated by thermogravimetric analysis. The weight loss temperature and glass transition temperature are verified for thermally aged NBR. The relationship between dynamic mechanical properties and elongation at break are also investigated. The threshold alue of thermally aged NBR is a ten year in the change of elongation at break.
Thermal Properties of Chloroprene Rubber with
Kim, Ki-Yup ; Lee, Chung ; Ryu, Boo-Hyung ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 64~70
The thermal properties of chloroprene rubber (CR) with
-ray irradiation has been investigated. The prepared CR was irradiated up to 1000kGy radiation dose by
-ray and the radiation degradation of CR was investigated by thermogravimetric analysis and differential acanning calorimetry. Dynamic mechanical properties measurement and FT-IR observation are carried out as well. From these analyses results, the glass transition temperature(
), decomposition onset temperature(DOT), oxidative induction time(OIT), the peak temperature of loss modulus and mechanical tan
values were compared for the radiation degradation level of CR. The tendency between
and peak temperature of loss modulus and mechanical tan
agreed well with radiation doses. Decomposition temperature, OIT and DOT showed the same tendencies as increasing radiation doses. It was verified that these analyses are available to estimate the degradation level of CR.
Fire Suppression Effect of PPV with Water Mist System
Kim, Sung-Won ; Shin, Chang-Sub ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 71~77
To inject fresh air into a fire room, Positive Pressure Ventilation (PPV) can be used and the blower of PPV increases inside pressure of the room. It makes high flow rate of products of combustion, smoke and heat from the structure, and it is very helpful to fireman on the fire extinguishing work. The flame moves to the direction of airflow and the temperature of flame can be decreased rapidly. In this experiment, a water mist system is applied to PPV to increase the effectiveness, and various effective factors are studied. n-Heptane and pine wood stick were used as fuel. Temperatures at the above and behind the combustion pan were strongly reduced by the water mist system and by the convective cooling with airflow. The smoke density was also decreased by PPV with water mist system and it can be explained by the absorption of smoke particles on the water mist droplet and by the strong exhausting effects of mobile fan.
A Study on the Environmentally Fraternized Preparation of Core-Shell Binder
Kwon, Jae-Beom ; Lee, Nae-Woo ; Seol, Soo-Duck ; Lim, Jae-Koel ; Lim, Jong-Min ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 78~84
Core-shell composite particles of organic/organic were polymerized by using monomers such as methyl methacrylate(MMA) and styrene(St) in the presence of sodium dodecyl benzene sulfonate (SDBS) below critical micelle concentration(CMC) changing concentration, kind of initiators, emulsifiers, addition method of monomers and speed of agitation. In the PMMA/PSt and PSt/PMMA core-shell polymerization, to suppress the generation of new particles and to minimize the coagulation during the shell polymerization, the optimum conditions were
at concentration of SDBS respectively. The optimum concentration of the other initiator was
of ammonium persulfate(APS) for core polymerization and
of APS for shell polymerization.
Elution Safety of Recycled Plastic/EAF Dust Composites by Using Leaching Test
Kang, Young-Goo ; Song, Jong-Hyeok ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 85~91
In this study, We have investigated leaching characteristics of heavy metals for recycled plastic composites containing EAF(Electric Arc Furnace) dust & EAF slag. EAF dust & EAF slag used that is generated in the 3 steel-making compaines in domestic. The physical and chemical properties of EAF dust & slag was examined by measuring specific surface area. porosity, oil absorption test and chemical wetting analysis etc. Results of total analysis indicated that EAF dust, slag contained significant amount of hazardous metals such as Cu, Pb, Cd and Cr. But, In the leaching test of the recycled plastic composites containing EAF dust, slag by Korean Standard Leaching Procedure, composites shows much lower leaching concentration of heavy metals. It was concluded that the recycled plastic composites containing EAF dust, slag showed good physical and chemical characteristics. This means that the EAF dust, slag can be effectively used as a functional filler.
Heavy Metal Absorption Properties of Sulfonated Polyethylene Terephthalate
Kang, Young-Goo ; Kim, Dong-Hyun ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 92~97
The purpose of this study is heavy metal absorption of recycled PET(poly ethylene terephatalate) NWF(non woven faric). The results of test are summarized as follows; Heavy metal abworption rates in Ni ions were higher then Zn and Cu ions, whereas heavy metal absorption rates by sulfonation times were not different. The heavy metal absorption times have a higher tendency from 60 min to 120 min. There were significant negative correlations among the amount used CSA(Chloro Sulfuric Acid) and the amount of absorption Zn(r = -0.33784, p < 0.05), Cu(r = -0.61177, p < 0.01) ions, whereas correlations between heavy metal absorption rates and sulfonation times were not significant. There were significant positive correlations among the amount of absorption Zn ions and the amount of absorption Ni(r = 96475, p < 0.014), Cu(r = 0.51614, p < 0.01) ions, likewise the positive correlations between the amount of absorption N ions and the amount of absorption Cu(r = 0.54766) ions were significant(p < 0.01).
3D Microwave Imaging Technology for Damage Detection of Concrete Structures
Kim, Yoo-Jin ; Kim, Yong-Gon ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 98~104
Various nondestructive evaluation (NDE) techniques have been studied to locate steel rebars of dowel, and to detect invisible damage such as voids and cracks inside concrete and debonding between rebars and concrete caused by corrosions and earthquakes. In this study, the aurhors developed 3-dimensional (3D) electromagnetic (EM) imaging technology to detect such damage and to identify exact location of steel rebars of dowel. The authors have developed sub-surface two-dimensional (2D) imaging technique using tomographic antenna array in previous works. In this study, extending the earlier analytical and experimental works on 2D image reconstruction, a 3D microwave imaging system using tomographic antenna array was developed, and multi-frequency technique was applied to improve quality of the reconstructed image and to reduce background noises. This paper presents the analytical expressions of numerical focusing procedures for 3D image reconstruction and numerical simulation to study the resolution of the system and the effectiveness of multi-frequency technique. Also, the design of 4?4 antenna array with switching devices is introduced as a preliminary study for the final design of whole array.
An Experimental Study on the Strength and Permeability Characteristics of Repair Mortar
Paik, Shin-Won ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 105~109
Structure surfaces damaged due to many causes are repaired by several special mortars. But wide studies about the permeability of these mortars were rarely conducted. In this study compressive strength test, flexural strength test and bond strength test of these mortars were conducted. And chloride ion penetration test was also conducted to explore the permeability charcteristics of selected repair mortars. This test was carried out following the standard ASTM C1202-91. Colouriemtric penetration depth can be drawn from these test results using a relationship equation between colourimetric penetration depth and charge passed which C. Andrade suggested. Diffusion coefficient can be calculated by CTH rapid method. To the end, the present study can provide a firm base for the application of repair mortars to concrete structures
The Safety Study on High Tension Bolted Splice by Sliding and Plastic Analysis
Bang, Myung-Seok ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 110~114
In this study is proposed the advanced elasto-plastic analytical method which can identify complex structural behaviors on the splice part of steel structures such as sliding and plastic contact problem between splice plates and blots. Compliated boundary conditions and various manufacturing defects are considered in various analytical cases. In the design or repair phase the plastic behavior and ultimate strength of splice parts should be very carefully verified to extend the service life of steel structures.
Development of State Assessment System of Low-Rise Reinforced Concrete Buildings to Remodeling
Kim, Jin-Soo ; Kim, Chang-Eun ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 115~123
Remodeling is not subject to strict laws or regulations for permission procedure and structure safety inspection compared with new construction. Most of building owners do not recognize the importance of structural safety enough and place an order to small unlicensed construction company. As a result, important structural materials are damaged without enough investigation into permitted durability and fixed weight and load weight increase. This study suggests a system that can evaluate the state of the building and enables fast judgment on needs of repairing or strengthening as well as needs structural examination.
Development of HPMA System for the Voluntary Safety Management of the Paint Industry
Mok, Yun-Soo ; Chang, Seong-Rok ; Ock, Young-Seok ; Chun, Seung-Hyun ; Lee, Seong-Jon ; Lee, Chang-Eon ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 124~129
We developed a HPMA Information System to establish the voluntary safety management for the Paint Industry. HPMA System means that manager, supervisor and worker on the process-line find out the hazardous and/or unsafe potentials, make improvement of the field safety by the cooperation with top manager, safety staff and eventually put in the practice. HPMA Information System consists of functions to suggest and evaluate the safety concerns hierarchically from top manager to workers on internet or intranet. We establish the safety management and sharing of the safety information and are able to find the unsafe potentials by the HPMA Information System. Also We are able to mine new safety information and establish accident prevention model by the Safety DATABASE.
Compliance of Employer and Employee with Occupational Safety Regulation in Small Sized Enterprises of under 5 Employees
Yi, Kwan-Hyung ; Rhee, Kyung-Yong ; Sohn, Doo-Ik ; Suh, Nam-Kyu ; Seo, Kwang-Guk ; Oh, Ji-Young ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 130~135
This study is planned to investigate the compliance of small sized enterprises of under 5 employees directed by Industrial Safety and Health Act. Occupational safety regulation can be required for employer and employee to comply because that all members of workplace should be involved to protect worker's health. When all members of workplace comply with safety regulation, effectiveness of regulation will be realized as expectation. The study subject is composed of three groups as 501 employers, 501 employees of small sized enterprises of under 5 employees and 107 safety inspectors sampled by stratified random sampling for comparison. Data for analysis is collected from each sample using interview with structured questionnaires. Compliance is measured by 5 point scale composed by 8 sub items such as general perception, understanding, clearness, necessity, relevancy, implementation, penalty, and general compliance of the regulation. Among sub items of employer's compliance, the level of perception of regulation, necessity of regulation, relevancy of penalty are differentiated among three groups. The level of all 8 items of employee's compliance also differentiated among three groups. These results show that strategies for ensuring the same level of compliance among three groups will be needed through education, training and evaluation of regulation and feedback.
Recognition of Occupational Safety and Health Management of Contractor Company
Rhee, Kyung-Yong ; Yi, Kwan-Hyung ; Oh, Ji-Young ; Suh, Nam-Kyu ; Son, Doo-Ik ; Gal, Won-Mo ; Shin, Moon-Jin ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 136~142
This study is planned to investigate the attitude toward the safety and health management of contractor company. Under the contract based production system, all of activities including safety and health management in the contractor company are depended upon the contract. How to make contract influence the worker's health of contractor company. Worker's health of contractor company can be protected by efforts of company of contract-out and contractor company, especially their safety managers. The modelling of the effective safety and health management system for contractor company should consider the need of safety manager of each company and employer of contractor company. Data is collected from safety managers of 3 contract out compaines as electronic and electrical manufacturing industry and 55 safety manager, 57 employers of their contractor compaines using self administered survey with structured questionnaire. The most of all respondents want to support from the contract out compaines. The most important items supported from contract out company is the information based on the safety information network between each company. Safety manager and employer of contactor company also itemized safety education and training in the supporting system from contract out company. These results can be generalized to survey on the other industries.
Ergonomic Study of Manual Hammering Tasks for Short Times
Kwon, Young-Guk ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 143~147
The present investigation examined hammering performance, physiological response, preceived exertion, and user preference with regard to hammering in vertical (wall) and horizontal (bench) orientations, and with regard to using two different hammers. Ten male subjects participated in the experiment. The results support previous findings that horizontally oriented hammering is faster than vertically oriented hammering. In addition, the results suggest that hammer differences can affect hammering performance and perceived exertion; although, the exact contributions of specific design characteristics could not be quantitatively determined. However, participants subjectively identified handle design, weight, and mass distribution as critical factors.
A Study on the Safety Assessment of Zinc Plating Process
Rhie, Kwang-Won ; Park, Moon-Hee ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 148~154
There are now the plating process that have many hazardous factor cause of the using numerous noxious chemical and bad working environments. The purpose of the study is to make a selection of suitable safety evaluation method that can analyze and righteously find with numerous hazardous factor of the plating process. And another purpose is to systematically adjust the risk of plating process by comprehension of the role of process, equipment, and source material. Therefore, these studies are carried out in the following three investigations of this report. The first research understands the injurious human health and environment by analyzing hazardous material based on the MSDS. To evaluate the safety of process and compartment, the second research is proposed the security secure counterproposal by using the FMEA and the HAZOP. The final research is devoted to systematically analyze the hazard by applying for reasonable guide word and doing the HAZOP for hazardous factor in specific process.
An Evaluation Model for Human Attributes of Industrial Accidents
Bae, Sung-Kyu ; Park, Dong-Hyun ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 155~163
The intensity of industrial accidents has been increased while the number of industrial accidents has been decreased in theses days. It represents that we need safety guidelines based on personal attributes as well as physical attributes. This study tries to identify major causative factors for industrial accidents and to suggest an evaluation model based on personal attributes. Specifically, relationship between self-efficacy belief associated with industrial safety and other relative personal attributes has been analyzed. First, FGI(Focus Group Interview) was conducted to identify important personal attributes of industrial accidents. The questionnaire was prepared based on the results of FGI and was applied to identifying personal attributes. The relationship between personal attributes identified in this study and self-efficacy belief was assessed using fuzzy logic and fault tree analysis. The results of the assessment showed that self-efficacy belief was closely associated with industrial accidents. Specifically, workers with accident experience had higher level of self-efficacy beliefs than workers without accident experience.
A Development on Reliability Data Integration Program
Rhie, Kwang-Won ; Park, Moon-Hi ; Oh, Shin-Kyu ; Han, Jeong-Min ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 164~168
Bayes theorem, suggested by the British Mathematician Bayes (18th century), enables the prior estimate of the probability of an event under the condition given by a specific This theorem has been frequently used to revise the failure probability of a component or system. 2-Stage Bayesian procedure was firstly published by Shultis et al. (1981) and Kaplan (1983), and was further developed based on the studies of Hora & Iman (1990) Papazpgolou et al., Porn(1993). For a small observed failure number (below 12), the estimated reliability of a system or component is not reliable. In the case in which the reliability data of the corresponding system or component can be found in a generic reliability reference book, however, a reliable estimation of the failure probability can be realized by using Bayes theorem, which jointly makes use of the observed data (specific data) and the data found in reference book (generic data).
The State Estimation by Unknown Disturbance Observer of Underwater Vehicle System for Robust Control
Lee, Jin-Woo ; Kim, Hwan-Seong ; An, Young-Joo ;
Journal of the Korean Society of Safety , volume 18, issue 4, 2003, Pages 169~175
In this paper, and estimation method for estimating the states of underwater vehicle systems with external unknown disturbance is proposed. First, the dynamics of underwater vehicle are induced by Taylor series expansion in the vertical plane and horizontal plane, respectively. For constructing the system model, the external efforts, i.e., the sea surface disturbances, the current, wave and etc., are regarded as external unknown disturbances. Thus the disturbance is added as external input into state-space form of underwater vehicle system. To estimate the state of systems with unknown disturbance, a disturbance observer which does not effected the external unknown input is proposed, and the existence condition for the observer is given. Finally, the effectiveness of the proposed disturbance observer for robust control of underwater vehicle systems is verified by using numerical simulation.