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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Safety
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Journal DOI :
The Korean Society Safety
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Volume & Issues
Volume 20, Issue 4 - Dec 2005
Volume 20, Issue 3 - Sep 2005
Volume 20, Issue 2 - Jun 2005
Volume 20, Issue 1 - Mar 2005
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Web-based Real Time Failure Diagnosis System Development for Induction Motor Bearing
Kwon, Oh-Heon ; Lee, Seung-Hyun ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 1~8
The industrial induction motor is widely used in the rotating electrical machine for the transmission of power. It is very reliable equipment, but it could lead to the loss of production and lift when failure occurs. Therefore, the failure data is acquired and analyzed by attaching an exclusive instrument to existing induction motor. However, these instruments could lead to side effects, increasing the production costs, because they are very expensive. The purpose of this study is the development of an induction motor bearing failure diagnosis system constructed using LabVIEW which can be supplied the kernelled function, process monitoring and current signature analysis. In addition, the availability and reasonability of the constructed system was examined for an induction motor with failure defects in outer raceway and ball bearing. From the results, it shows that failure diagnosis system constructed is useful for real-time monitoring with detection of bearing defects over the web.
A Study on the Characteristics of Inconel 625 for Casing and Tubing by FCAW Process
Park, Keyung-Dong ; Jin, Yonug-Beom ; Park, Hyoung-Dong ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 9~13
Inconel 625 is useful in variety of industrial applications because of the resistance to attack on various corrosive media at temperature from
, in combination with good low and high temperature mechanical strength. Recently, this material is also used widely in offshore processing piping in order to extend the maintenance term and improvement the quality of anti-corrosion. In general, high quality weldments for this material are readily produced by commonly used processes. Not all processes are applicable to this material group, Ni-alloys. Metallurgical characteristics or the unavailability of matching, position or suitable welding process. Nowadays, the flux cored wire is developed and applied for the better productivity in several welding position including the vertical position. In this study, the weldability and weldment characteristics(mechanical properties) of inconel 625 are considered in FCAW(Flux Cored Arc Welding) associated with the severial shielding gases(
) in viewpoint of welding productivity.
Developement of Ultrasonic Handy Scanner for Welding Inspection
Kang, Dong-Myeong ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 14~18
The ultrasonic handy scanner to be developed in this research is a nondestructive inspection equipment with various facility. The ultrasonic inspection is the technique area which apply range is increasing greatly with IT. The purpose of this research is development of a ultrasonic handy scan inspection device with the utility in a work spot. The ultrasonic handy scanner to be developed with portability in this research is able to carry out the spot inspection. It can contribute to the quality improvement, cost reduction and safety design.
Fault Train Construction Based on Shallow Reasoning Strategy
Bae, Yong-Hwan ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 19~26
There are three reasoning method in fault diagnosis process. The shallow reasoning is based on the experiential knowledge and deep reasoning is based on physical model. Hybrid reasoning is mixing two type reasoning. This study describes about fault train embodiment of screw type air compressor that is used widely in industrial facilities by using various experimental method and shallow reasoning. We investigate macroscopic failure cause of air compressor through naked eye observation and then microscopic failure cause by various experimental method. We composed fault train with fault knowledge based on empirical data and scientific data that is acquired through several experiments. It is possible to analysis system reliability and failure rate with these fault train.
The Effect of Ageing on the Transformation Behavior of Ti-50.4at.% Ni Alloy(II)
Kim, Sung-Jin ; Woo, Heung-Sik ; Park, Sung-Bum ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 27~33
The shape memory effect in Ti-50.4at.%Ni alloy after solution treatment at 1273K for 2h and aged at 350, 450,
for 0.5, 1, 1.5, 2, 4, 10hrs had been investigated by differential scanning calorimetry measurement. It was found that ageing in the temperature range of
induced complex transformation behavior, involving the R-phase and multiple-stage martensitic transformation. Usually aged Ni-rich NiTi alloys undergo martensitic transformation on cooling from high temperatures in two step : Austenite to R-phase and then R-phase to Martensite (normal behavior). In sample aged at
two distinct DSC peaks arised giving evidence of intermediate stages of martensite transformation. This results in the nucleation and growth of coherent
-precipitate. These explain all features of the evolution of DSC charts during ageing including the number of distinct DS peaks and their positions.
Stress Analysis and Residual Life Assessment of T-piece of High Temperature Pipe
Kwon, Yang-Mi ; Ma, Young-Wha ; Cho, Seong-Wook ; Yoon, Kee-Bong ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 34~41
For assessing residual lift of the steam pipe in fossil power plants, inspections and analysis are usually focused on the critical locations such as butt welds, elbows, Y-piece and T-piece of the steam pipes. In predicting the residual life of T-piece, determination of local stress near welds considering system load as well as internal pressure is not a simple problem. In this study, stress analysis of a T-piece pipe was conducted using a three-dimensional model which represents the T-piece of a domestic fossil power station. Elastic and elastic-creep analysis showed the maximum stress level and its location. Residual creep rupture life was also calculated using the stress analysis results. It was argued that the calculated life is reasonably same as the measured one. The stress analysis results also support life prediction methodology based on in-field replication technique.
Analysis of Characteristics on the Static Electricity by Streaming Electrification
Kim, Gil-Tae ; Lee, Jae-Keun ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 42~46
The static electricity by thinner flow and discharge energy is investigated experimentally for the purpose of preventing the electrostatic discharge and damage. Test system for evaluating streaming electrification consists of a teflon pipe, a reservoir tank a pump, flowmeters and an electrometer. When dielectric liquid flows through a pipe from one vessel to another, the potential difference generated in the collecting vessel is due to the accumulation of charges. These charges result from the convection of a part of the electrical double layer existing in the tube at the contact between the liquid and the inner wall. When the fluid velocity increases, the electric current increases proportionally. The charging current and accumulated charges by streaming electrification at the thinner velocity of 40cm/s are measured a range of 5 nA and
respectively. This amount of static discharge energy generated by streaming electrification is enough to ignite flammable solvent. Therefore surface electric potential should decrease by using electrostatic shielding and ground.
Analysing and comparing efficiency of harmonic reduction equipment for Induction Motor
Park, Yang-Birm ; Kim, Doo-Hyun ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 47~52
Recently, power conversion equipment increased rapidly makes a lot of harmonics. Thus, it is growing that wrong operation and break down of sensitive devices. There are two kinds of causes of harmonics. One of them is lots of power conversion equipment as modem controller, inverter, converter and SWS(Switching Mode Power Supply). Another is nonlinear operating machines as transformer and motor. The more nonlinear loads like them grow, the more serious problems as harmonic current to source and low power factor because of increasing reactive power grow. It is installed for reactor and L-C Filter to decrease harmonic in general. This paper analysis and compares two of characteristics and harmonic from reactor and L-C Filter with operation of induction motor and power conversion equipment. In the result, L-C Filter more improves unbalance rate and THD than reactor.
Development of a Classification System for an Electrical Fire Investigation
Lee, Jong-Ho ; Kim, Doo-Hyun ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 53~57
This paper presents development of a classification system for an electrical fire investigation. In order to reduce an electrical fires and establish detailed prevention plans, the collection of an electrical fire causes and base data are very important. Based on this data, a new classification system for an electrical fire investigation was developed and the direction to the classification system was suggested by fundamental analysis. All of the collected information is analyzed by bottom-up method. Criteria items which based on base data were categorized to classify items. The classification of items were found out as follows : basic condition fire scene condition, fire sign, fire cause. Particularly, the fire cause category is classified. A new developed classification system for an electrical fire investigation will be used to analyse electrical fires easily and efficiently.
The Change of the Cyclic Aging Characteristics under Salt-fog/Heating on Silicone Rubber by ATH Additions
Lee, Chung ; Kim, Ki-Yup ; Kim, Gyu-Baek ; Ryu, Boo-Hyung ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 58~63
In this research, silicone rubber with additions of inorganic filler, alumina trihydrate
, was aged acceleratedly and cyclically by the salt-fog and heating. The optimum amount of ATH addition to silicone rubber have been investigated by measurements of leakage current in the change of electrical properties and tensile strength, %elongation in mechanical properties and FT-IR, TG, SEM in the change of the chemical properties. With regard to un-aged silicone rubber, as the ATH addition amount increases, conductive path formation time was shortened in the electrical properties and tensile strength was increased, %elongation was decreased. In case of identical ATH addition amount, as cyclic aging increases, surface resistivity, tensile strength and %elongation were decreased. Considering the cyclic aging, the most effective amount of ATH addition was about 90phr.
Fault Detection and Classification of Faulty Induction Motors using Z-index and Frequency Analysis
Lee, Sang-Hyuk ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 64~70
In this literature, fault detection and classification of faulty induction motors are carried out through Z-index and frequency analysis. Above frequency analysis refer Fourier transformation and Wavelet transformation. Z-index is defined as the similar form of energy function, also the faulty and healthy conditions are classified through Z-index. For the detection and classification feature extraction for the fault detection of an induction motor is carried out using the information from stator current. Fourier and Wavelet transforms are applied to detect the characteristics under the healthy and various faulty conditions. We can obtain feature vectors from two transformations, and the results illustrate that the feature vectors are complementary each other.
A Study on the Explosion Relief Venting in the Gas Explosion
Oh, Kyu-Hyung ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 71~77
This study aims to find the safe vent area to prevent a destruction of building by gas explosion in a building. Explosion vessel which used in this experiment is 1/5 scale down model of simple livingroom and its dimension is 100cm in length 60cm in width and 45cm in height. Liquified petroleum gas(LPG) was injected to the vessel to the concentration of 4.5vol%, and injection rate were varied in 1L/min or 4L/min. Gas mixture was ignited by the 10kV electric spark. For analysis the characteristics of vented explosion pressure according to the vent size and vent shape, its size and shape were varied. From the experiment, it was found that explosion pressure in the vented explosion :in affected by the gas injection rate, vent area and vent shape. And the vent area to volume ratio(S/V) to prevent the building destruction by explosion pressure, it is recommended that the design of vent area happened by the explosion should be above 1/500cm in S/V. And if the vent area has complicate structure in same area, vented explosion pressure will be higher than a single vent, and possibility of building destruction will increase. Therefore to effectively vent the explosion pressure for protect a building and residents from the gas explosion hazards, the same vent area should have a singular and constant shape in the cross-sectional area of the vessel.
A Study of Characteristics such as Spontaneous Ignition, Flash Point and Explosion Behavior of Methyl Ethyl Ketone Peroxide in ender to Determine its Hazardousness
Jung, Doo-Kyun ; Choi, Jae-Wook ; Lee, In-Sik ; Lim, Woo-Sub ; Kim, Dong-Kyu ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 78~83
In this study, the evaluate characteristics of fire and explosion of MEK-PO are subjected to spontaneous ignition, flash point and explosion hazard. The minimum ignition temperature and instantaneous ignition temperature for MEK-PO were
. In addition The flash point for MEK-PO was obtained at
. Furthermore, the maximum explosion pressure and the maximum explosion pressure rising velocity: using MCPVT (mini cup pressure vessel tester) were
A Study of Thermal Decomposition Characteristics of Poly(
Kim, Nam-Seok ; Seul, Soo-Duk ; Park, Keun-Ho ; Lee, Woo-Nae ; Kim, Duck-Sool ; Lee, Seok-Hee ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 84~90
Thermal decomposition of the copolymer of
-Methylstyrene(AMS) with Acrylonitrile(AN) was investigated. The copolymer was synthesized in a continuous stirred tank reactor(CSTR) at
using toluene and benzoyl peroxide(BPO) as solvent and initiator, respectively. The reactor volume was 0.3 liters and residence time was 3 hours. The activation energy of thermal decomposition was in the ranges of
kcal/mol for AMS with AN copolymer. The thermogravimetric trace curves were well agreed with the theoretical calculation.
A Study on Explosive Limits of Flammable Materials - Explosive Limits of Ternary System by Means of Solution Thermodynamics and MRSM Model -
Ha, Dong-Myeong ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 91~97
The research on the explosive limits is one of fundamental fields of combustion process, and information on the explosive limits of mixture of fuel and oxidant, with or without additives, is very important for the prevention in industrial fire and explosion accidents. Explosive limits of all compounds and solvent mixtures can be calculated with the appropriate use of the fundamental laws of Raoult, Batten, Le Chatelier and MRSM(modified response surface methodology) model. In this study, the reference values of lower explosive limits(LEL) of the ethanol+toluene+ethylacetate system were compared with the calculated values by using the solution thermodynamics and the MRSM model, respectively. The values calculated by the proposed equations were a good agreement with literature data within a few percent. By means of this methodology, it is possible to evaluate reliability of experimental data of the lower explosive limits of the flammable mixtures. Also, from given results, it is possible to predict explosive limits of the other flammable liquid mixtures used in the chemical process by the use of the proposed equations.
Predicting of Fire Characteristics of Flame Retardant Treated Douglas fir Using an Integral Model
Park, Hyung-Ju ; Kim, Hong ; Ha, Dong-Myeong ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 98~104
This study experimentally and theoretically examines the fire characteristics of 100- by 100- by 50-mm samples of flame retardant treated Douglas fir. Samples were exposed to a range of incident heat fluxes 10 to
. The time to ignition measurements obtained from the cone heater were used to derive characteristic properties of the materials. A one-dimensional integral model has been used to predict the, time to ignition, critical heat flux and ignition temperature of samples. Ignition data and best-fit curves confirm
. And Ignition of flame retardant treated samples occurred not at incident heat flux of bellow
. By a one-dimensional integral model, the critical heat flux of each samples was predicted
for the D-N, D-F2, and D-F4, respectively. In ignition temperature of each samples, flame retardant treated samples were measured high about
than non-treated samples. Water-soluble flame retardant used in this study finds out more effect in delay of time to ignition when incident heat flux is low than high.
Extinguishment of n-heptane Pool Fire by Water Mist Containing Alkali Metal Agent
Park, Jae-Man ; Shin, Chang-Sub ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 105~111
An experimental study is performed for extinguishing of n-heptane pool fire by water mist containing potassium acetate as a fire suppression additive. Water mist was generated by a single pressure nozzle in a small-scale chamber. The drop size distribution of water mist was measured using laser diffraction(Malvern particle sizer). The flame temperature, oxygen concentration and carbon monoxide concentration were measured. In case of using additives, the fire extinguishing time was shorter than that of pure water at a given discharge pressure and it was because the momentum of a water droplet containing additives was increased. And also dissociated metal atoms, potassium, were reacted as a scavenger of the major radical species OH, H which were generated for combustion process. Moreover, at a high pressure of 4MPa, the fire was extinguished through blowing effect as well as primary extinguishing mechanisms.
A Study of Classification of Road Tunnel for Fire Safety
Yoo, Ji-Oh ; Rie, Dong-Ho ; Shin, Hyun-Jun ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 112~119
In road tunnel, in order to prevents an accident and minimize the damage of an accident in the case of fire, safety facilities and equipments are integral parts. The type and amount of safety facilities are based on tunnel type and length, traffic flow rate, etc. Therefore many countries use a tunnel classification system that categories tunnel into groups, and specifies the necessary emergency equipment for each group. In this study, for the purpose of classifying tunnel based on tunnel ist investigated the domestic and foreign standards and regulations for safety of road tunnel. As a results, we suggest the method of classification of tunnel by traffic performance, tunnel grade, the volume of traffic, fraction of HGV, rules or regulations for transports of dangerous good through tunnel.
A Study on the Strength Change of Used Pipe Support(II)
Paik, Shin-Won ; Ro, Min-Lae ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 120~125
Formwork is a temporary structure that supports its weight and that of freshly placed concrete as well as construction live loads. Among the accidents and failures that occur during concrete construction, many are formwork failures which usually happen at the time concrete is being placed. In constructions site, pipe supports are usually used as shores which are consisted of the slab formwork. The strength of a pipe support is decreasing as it is frequently being used at the construction site. The objective of this study is to find out the strength change of used pipe support and unused pipe supports according to aging. In this study, 2857 pipe supports were prepared. Among these pipe supports, 2337 pipe supports were lent to the construction companies fire of charge. 520 pipe supports were kept on the outside. Compressive strength was measured by knife edge test and plate test at each 3 month. Test results show that the strength of unused pipe supports as well as used pipe supports was decreasing according to age, use frequency and load carrier, and the strength of used pipe supports was lower than the strength of unused pipe supports at the same age. So, the strength of used pipe supports from 191 days to present day was not satisfied the specification of KS F 8001. According to these results, it shows that attention has to be paid to formwork design using used pipe supports. Therefore, the present study results will be able to provide a firm base to prevent formwork collapses.
Structural Behavior of Sawdust-Mixing Concrete
Hong, Seung-Ryul ; Son, Ki-Sang ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 126~133
Behavior of saw-dust concrete has not studied because many people have thought that saw-dust concrete cannot be applicable for structural member, up to now. This study is to findout how much the concrete can be structurally applicated. 5mm grid sieve was used to select satisfactory sawdust for better concrete quality. Test molds size of
long were made of normal without sawdust, 0.05%, 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8% 2.0%, for making concrete strengh of 180kg, 210kg, 240kg, 270kg which they are normally used in practice presently. A various strengths tests such as compressive splitting tensile, flexible strength behavior of structural member named beam using size of
have been done for the structural aspects. Tensile strength shows that it can be more affected than higher strength of it.
Measurement of Organic Solvent from Painting Work Inside the Steel Box Girder of Bridge
Lee, Jung-Woo ; Son, Ki-Sang ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 134~142
This study is to find out how organic solvent will be propagated from painting inside the steel box girder of bridge.
of inside size of steel box girder is not suitable for painters to do his work comfortably and hygienically. Substance density(ppm)inside the space of the box unsatisfactory hygienical condition. Most of organic solvent(mainly toluene) came down to 0.5m in two minutes and 53sec. But personal protection for painter should be properly kept against flying this heavy organic solvent. longitudinally 27.1m in length is a cell unit of the whole length of bridge. Model XP-3l6A made in Japan is a main instrumentation adjusted to sense organic solvent especially toluene which can be measured up to 10,000ppm. Scenario analysis by computer program, safer release 2.0 has been performed first to estimate how the organic solvent will be propagated. And then actual test was done as a model. This has been measured for approximately five(5) minutes, with 30 sec interval. Actual measurement results showed much higher
than result analyzed by the computer program, meaning that this painting work can give worse effect to the worker who is painting inside the box girder of the bridge. The first meas urement level over the floor set up at 30cm height from the floor, because organic solvent was estimated to stay at the level. and then, they were measured at 1.0m, 1.5m level respectively, more.
A Study on Characteristics and Dynamic Response Spectrum of Near Fault Ground Motions
Bang, Myung-Seok ; Han, Sung-Ho ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 143~151
In this study, it is demonstrated that how the effect of the Near Fault Ground Motion affects the response of the structure. Considering the general characteristic of Near Fault Ground Motion the characteristics of Near Fault Ground Motions is analysed by elastic response spectrums, and the inelastic response spectrum is evaluated with the ductility and the yield strength to consider the inelastic behavior which couldn't be simulated through the elastic response spectrum. The result of this study shows that the effect of Near Fault Ground Motion should be considered in the long period range of long span structures but the domestic seismic design code was developed based on Far Fault Ground Motions, so the effects of Near Fault Ground Motions, which is very serious especially in large structures with a long period, are not considered. Therefore, the effect of the Near Fault Ground Motion has to be examined especially in the seismic performance evaluation of long period structure
Characteristics of Stress-Displacement on Uplift Loaded Group Piles
Lee, Jun-Dae ; Ahn, Byeong-Cheol ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 152~157
This experimental study was devoted to investigate skin friction of H group piles with uplift loading conditions in granite soil under laboratory test. Model piles made of steel embedded in weathered granite soil were used in this study. Pile arrangements(
), pile space(2D, 4D, 6D), and soil density(
) were tested. The main results obtained from the model tests can be summarized as follows. The series of tests found that ultimate uplift load and displacement for group piles were increased as piles space ratio increases to
of soil density. In the relative density of
, bearing capacity for group piles was greater than for single pile. In the relative density of
, the theoretical value of skin friction for group piles was greater than practical value. In the relative density of
, both theoretical and practical value of skin friction for group piles were increased as piles space ratio increases.
The Ultimate Shear Strength of RCS System Beam-Column Joints Considering the Transverse Beam
An, Jae-Hyeok ; Park, Cheon-Seok ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 158~163
This paper is focusing on the model to predict the ultimate shear strength on joints of composite system (RCS) with reinforced concrete columns and steel beams considering the transverse beam. It reviews the ratio of experimental shear strength to design strength calculated by existing desist equations which are proposed by Kanno, Wight, Noguchi and the rising of strength by the transverse beams. When the shear strength of joints is estimated, it is necessary to do research work for the stress transfer mechanism considering two concrete strut of inner and outer panel by web of the transverse beam. In order to confirm it requires further experimental and analytical study.
Total Safety Management System by Owner's Lending for the Effective Prevention of Construction Accidents
Hong, Sung-Ho ; Lee, Seung-Hyun ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 164~173
In this paper, the systematic problems of safety management in domestic construction industry are presented by the investigation and analysis of construction fatal injuries. In particular, it is discussed that the current construction safety management system by contractors leading is ineffective to prevent the serious accidents caused by inappropriate planning and design and to circulate the safety management cycle without interruption. A couple of ways for improving domestic construction safety management system are suggested in broad perspective. This is done by the analysis of construction safety management system of four advanced industrial countries such as the United States, the United Kingdom, Germany, and Japan and the study of a best practice. Total safety management system by owners leading is recommended to prevent construction accident effectively because this system makes all the parties join to the management system and distribute the responsibilities clearly to each party. This will drop the accident occurrence rate by dragging all the parties' cooperations and activating the total safety management system in an early stage.
Earthquake Analysis of Concrete Gravity Dams Considering Inelastic Damage of Dam-foundation Boundary
Lee, Jee-Ho ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 174~179
In this paper, a computational model for nonlinear crack damage analysis of concrete gravity dam-foundation boundary region subjected to earthquake loading is suggested. An enhanced model based on the Lee-Fenves plastic-damage model is used as the inelastic material model for a concrete dam structure and rock foundation. The suggested model is implemented numerically and used for computational earthquake simulation of Koyna dam, which was severly damaged from the strong earthquake in 1967. From the numerical result it is demonstrated that the suggested computational model can realistically represent crack initiation and propagation in the dam-foundation boundary region.
A Questionnaire Survey on Safety Consciousness of Seafares'
Kim, Jae-Ho ; Chang, Seong-Rok ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 180~187
The purpose of this study is to investigate safety consciousness of seafares'. The subjects were 437 seafaes' who took a safety education course in Korea Institute of Maritime and Fisheries Technology. This questionnaire was focused on finding the basic data for prevention of industrial accidents, and getting the public opinions and proposals of seafares'. The results obtained by this study are as follows : The average score of safety consciousness for seafares' were 68.82. Current position level of education navigation area classification of ships, ship size, ship age showed significant difference in statistics(p<0.01). Based on these results, this research pointed out the need to review the training manual, development of educational programs, improvement of facilities to improve safety education of ship, etc.
Relationships between Shift Work and Occupational Accidents in a Steel Company
Seo, Yoo-Jin ; Kazuya, Matsumoto ; Moon, Se-Keun ; Jung, Min-Sang ; Kim, Myung-Il ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 188~196
Accident reports from 1991 to 2000 of a steel company were used to analyze which factors induce industrial accidents. The subjects were 8,311 blue-collar workers, who sustained 114 occupational injuries and work on a continuous full-day 3-team 3-shift system of backward rotation(mornings to afternoons to nights). With respect to marital status, the occupational injury rate(OIR) on the married workers was significantly higher compared to unmarried workers. With respect to no, the OIR of those in their early 20s was significantly higher when compared to other age groups. The OIR of highly educated workers showed a reduction when compared with lower educated workers. The OIR of shift workers were significantly higher compared with the daytime workers. The OIR of type of work decreased across the steel manufacturing process, rolling process, machine maintenance section forwarding products section to the field management section. With respect to the block of shift work(morning, afternoon, and night shifts) by the type of work, the OIR of the night shift was higher than those of the morning shift in the steel manufacturing process or forwarding products section. The OIR of the machine maintenance section was slightly higher in the morning shift than those of the night shift. The OIR of the time of day of the shift workers reached a peak between 09:00 and 11:00. The OIR of a slight injury to shift workers decreased across the night, afternoon, to morning shifts whereas the OIR of a serious injury tended to decrease across the night, morning, to afternoon shift. The body parts most commonly injured were the arm and the crus.
Investigating the Work Ability of Employees in the Korean Machinery Industry
Kang, Jong-Cheol ; Baek, Seung-Yub ; Chang, Seong-Rok ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 197~201
The purpose of this study is to investigate the work ability of employees using the work ability index(WAI) and to confirm factors affecting the work ability of employees in the Korean machinery industry. In this study, correlations between the WAI score and variables affecting the work ability of employees(age, the class of the employee's position the character of the work and the type of the work) were analysed by the correlation analysis. The study population was consisted of employees from Korean machinery industry(n=446) and the WAI questionnaire was more or less modified considering actual circumstances in Korean. The WAI score of entire employees was slightly high (WAI score=42, Level=Good) and the WAI score of employees under 29 years of age was slightly higher than that of employees over 30 years of no. As a result of one-way ANOVA and correlation analysis, the character of the work and the type of the work were variables affecting the WAI score and the WAI score of physical/mental workers was higher than that of physical workers.
A study on Job Stress and MSDs(Musculoskeletal Disorders) of Workers at Automobile Manufacturing Industry
Choi, Soon-Young ; Kim, Hyun-Sung ; Kim, Tae-Heon ; Park, Dong-Hyun ;
Journal of the Korean Society of Safety , volume 20, issue 3, 2005, Pages 202~211
Musculoskeletal Disorders(MSDs) have been a growing problems with higher incidence rate every year. The 65% of all work-related diseases in the US has been MSDs since the middle of the 90s according to BLS(Bureau of Labor Statistics, 1995). The MSDs in Korea has been increased in recent 10 years as well. This study has tried to focus on job stress associated with MSDs that has not been usually studied before. Specifically job stress of workers at automobile manufacturing industry and relationship between job stress and symptoms of MSDs have been major concerns in this study. The workers had higher stress with longer working experience, longer working hours, and worse working environment. The job stress had strong association with the symptoms at hand, wrist and low back. Specifically, job stress factors such as job requirement and job future ambiguity had more effects on the symptoms of MSDs.