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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Safety
Journal Basic Information
Journal DOI :
The Korean Society Safety
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Volume & Issues
Volume 24, Issue 6 - Dec 2009
Volume 24, Issue 5 - Oct 2009
Volume 24, Issue 4 - Aug 2009
Volume 24, Issue 3 - Jun 2009
Volume 24, Issue 2 - Apr 2009
Volume 24, Issue 1 - Feb 2009
Selecting the target year
A Study on the Shape Memory Characteristic Behaviors of Ti-42.5at.%Ni-2.0at.%Cu Alloys in Tension and Compression Condition
Woo, Heung-Sik ; Cho, Jae-Whan ; Park, Yong-Gyu ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 1~5
NiTiCu alloys can produce a large force per unit volume and operate with a simple mechanism. For this reasons, it has been widely studied for application as a micro actuator. So in this study, one-way and two way shape memory effects of Ti-42.5at%Ni-2.0at%Cu alloys are studied. In the case of one-way shape memory effects, shape memory recoverable stress and strain of this alloys were measured by means of tension and compression tests under constant temperature. The strains by tension and compression stress were perfectly recovered by heating at any testing conditions also shape memory recoverable stress increased to 116 MPa in tension tests and to 260 MPa in compression tests. In the case of two-way shape memory effects, transformation temperatures from thermal cycling under constant uniaxial applied tension and compression loads linearly increased by increasing external loads and their maximum recoverable strain is 3.8% at 100MPa tensile condition and 2.2% at 125 MPa compression condition.
Human Experimental Studies on the Risk of Electric Shock due to Damage of Underground Wire in Street Lamp
Chung, Jae-Hee ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 6~12
This study performed an experiment for the danger of an electric shock in the human body, which is directly touched or approached to the exposure of buried metals in a leak caused by certain ground faults at a buried cable in street lamp. In the results of the experiment, the dangerous of electric shocks due to the earth specific resistance and wet and submersion of the earth surface represents a high level as the human body is directly touched to the buried metal at a leak point. In addition, it can be seen that the safety of the human body is influenced by the earth specific resistance, separated distance from buried metals, and shape of buried metals at around the leak point.
Assessment of Thermal Hazard on Esterification Process in Manufacture of Concrete Mixture Agents by Multimax Reactor System
Han, In-Soo ; Lee, Keun-Won ; Pyo, Don-Young ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 13~20
The risk assessment of thermal hazard to identify chemical or process hazard during early process developments have been considered. The early identification of thermal hazards associated with a process, such as rapid heats of reaction, exothermic decompositions, and the potential for thermal runaways before any large scale operations are undertaken. This paper presents to evaluate the safe operating parameters/envelope for exist plant operations. The assessment of thermal hazard with operating conditions such as amount of process materials, inhibitor, and catalyst on esterification process in manufacture of concrete mixture agents are described. The experiments were performed by a sort of calorimetry with the Multimax reactor system as a screening tool. The aim of the study was to evaluate the thermal risk of process material and mixture in terms of safety security to be practical applications in esterification process. It suggested that we should provide the thermal hazard of reaction materials to present safe operating conditions with cause of accident through this study.
Extinguishing Characteristics of Cooking Oil Fire by Water Mist added with AFFF Agent
Shin, Chang-Sub ; Kim, Seong-Yong ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 21~27
Effective way of cooking oil fire extinguishment is using water mist system which has cooling and smothering effects. Low pressure water mist system has advantage because it is compatible with existing sprinkler systems. To increase the effectiveness of low pressure water mist system, additives can be used which increase the momentum of water particle and the chemical effect. In this experiment, aqueous film forming form(AFFF) agent is used as additive and the effect of additive concentration and water pressure are experimented. For the extinguishment of cooking oil fire such as soybean and olive oils, AFFF agent is effective and can decrease the fire extinguishing time and water consumption.
Investigation of Combustible Characteristics for Risk Assessment of Benzene
Ha, Dong-Myeong ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 28~33
The thermochemical parameters for safe handling, storage, transport, operation and process design of flammable substances are explosion limit, flash point, autoignition temperatures(AITs), minimum oxygen concentration(MOC), heat of combustion etc.. Also it is necessary to know explosion limit at high temperature and pressure. For the safe handling of benzene, lower explosion limit(LEL) at
, the temperature dependence of the explosion limits and flash point were investigated. And the AITs for benzene were experimented. By using the literatures data, the lower and upper explosion limits of benzene recommended 1.3 vol% and 8.0 vol%, respectively. This study measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for benzene, and the experimental AIT of benzene was
. The new equations for predicting the temperature dependence of the explosion limits of benzene is proposed. The values calculated by the proposed equations were a good agreement with the literature data.
Analysis Techniques for Accident Causes of Subcontract Work at Construction Site
Son, Ki-Sang ; Rhee, Kyung-Yong ; Gal, Won-Mo ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 34~42
There are many accident causes related to even an accident. As well four(4) stepped causes of one accident at construction sites are analyzed in the study. First, eleven(11) cause factors are set up at each step such as policy level, management, indirect, direct level which are discussed and determined by field experts with 15year experience or more. Therefore, one direct cause occurred in construction site can be connected to the previous cause than in direct and management, and policy problem of previous management. These questionnaires results are analyzed with three different methods such as weighing level by Delphi technique, correlation analysis, critical pass method. Three different methods show their characteristic to see which subcontract work is more dangerous or not. Subcontract or at a construction site can be use the above three different cases as they need at their site in order to make more effective countermeasures.
Investigation of Statbility of Truncated Tetrahedron Type Amore Block
Cho, Hong-Dong ; Bae, Woo-Seok ; Kim, Myeong-Kyun ; Lee, Ho-Jin ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 43~47
Armor block is used to reduce wave energy. To do this, the stability of coastal structure is enhanced. It is very expensive to develop a new type armor block. So, the research of new type armor block is very short. We develope truncated tetrahedron type armor block(new type block) which have a hole in center part. In this study, the stability of new type armor block is investigated by hydraulic model test. In the result, the stability coefficient(
) of new type armor block is 11.8. this value is more superior than value of tetrapod.
Optimal Design of PSC-I Girder Bridge Considering Life Cycle Cost
Park, Jang-Ho ; Shin, Yung-Seok ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 48~56
This paper presents the procedure for the optimal design of a PSC-I girder bridge considering life cycle cost (LCC). The load carrying capacity curves for the concrete deck, PSC-I girder and
-type pier were derived and used for the estimate of service lives. Total life cycle cost for the service life was calculated as sum of initial cost, damage cost, maintenance cost, repair and rehabilitation cost, user cost, and disposal cost. The advanced First Order Second Moment method was used to estimate the damage cost. The optimization method was applied to the design of PSC-I girder bridge. The objective function was set to the annual cost, which is defined by dividing the total life cycle cost by the service life, and constraints were formulated on the basis of Korean Standards. The optimal design was performed for various service lives and the effects of design factors were investigated.
Establishment of Guardrail Distance for Safety of Reinforced Earth Retaining Wall by Vehide Collision
Park, Kwon ; Hong, Ki-Nam ; Ahn, Kwang-Kuk ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 57~62
In this study, the numerical analyses regarding the distance between the guardrail and the reinforced earth wall as parameter were performed to determine the safe distance of guardrail installed on reinforced earth wall from the reinforced earth wall. The analyses were fulfilled by increasing the distance between the guardrail and reinforced earth wall from 150mm to 750mm. The computer program used in this research is LS-DYNA, which is very' popular in analysis of vehicle collision. Ford single unit truck in NCAC was employed as the model of vehicle and the velocity of vehicle collision was 80km/hr. As a results of analyses, the safety of guardrail was secured regardless of the distance between the guardrail and block of reinforced earth wall. However, to secure the safety of block of reinforced earth wall the distance between the guardrail and block of reinforced earth wall should be over 600mm.
Vital Area Identification of Nuclear Facilities by using PSA
Lee, Yoon-Hwan ; Jung, Woo-Sik ; Hwang, Mee-Jeong ; Yang, Joon-Eon ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 63~68
The urgent VAI method development is required since "The Act of Physical Protection and Radiological Emergency that is established in 2003" requires an evaluation of physical threats in nuclear facilities and an establishment of physical protection in Korea. The VAI methodology is developed to (1) make a sabotage model by reusing existing fire/flooding/pipe break PSA models, (2) calculate MCSs and TEPSs, (3) select the most cost-effective TEPS among many TEPSs, (4) determine the compartments in a selected TEPS as vital areas, and (5) provide protection measures to the vital areas. The developed VAI methodology contains four steps, (1) collecting the internal level 1 PSA model and information, (2) developing the fire/flood/pipe rupture model based on level 1 PSA model, (3) integrating the fire/flood/pipe rupture model into the sabotage model by JSTAR, and (4) calculating MCSs and TEPS. The VAT process is performed through the VIPEX that was developed in KAERI. This methodology serves as a guide to develop a sabotage model by using existing internal and external PSA models. When this methodology is used to identify the vital areas, it provides the most cost-effective method to save the VAI and physical protection costs.
A Study on Quantitative Estimation of Uninsured Cost
Lee, Tae-Yeong ; Lee, Jong-Bin ; Chang, Seong-Rok ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 69~76
The estimation of costs from industrial accidents is very important because they have a serious effect on individuals, companies, and nation. The department of labor estimates the cost of accidents by using the "Heinrich" method. From that method, the scale of accident cost can be approximately computed, but accurate calculation of uninsured cost is not easy. Therefore, a better method of calculating uninsured cost caused by industrial accident is necessary. This study aimed to construct an estimation method of uninsured cost according to domestic circumstances. The results of this study are as follows: (1) This study derived applicable factors for quantitative estimation of industrial accident cost (2) This study made the equation that the calculation of each item of uninsured cost was possible (3) This study applied the uninsured cost by degrees of disaster to individual items (4) The subjects and types of occurrence in uninsured cost were analyzed and presented. Theses results will provide a basis for further researchers of uninsured cost.
A Study on the Factors Influencing Safeness of Work Environment in Manufacturing Industry
Kwon, Oh-Jun ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 77~83
The manufacturing industry is the one with the most frequent industrial disasters, and it is important to study the safety climate recognized by workers in the industry in order to actively prevent industrial accidents. However, little research has been performed on the safety climate in workplaces felt by the workers in the manufacturing industry. The purpose of this study is to identify the factors affecting work environment safeness based on practical analysis via survey, and to establish the relation between safety performance factors and safeness of work environment. The survey was performed for workers in the manufacturing industry(n=228), and structural equations model analysis by using the AMOS 7.0 was performed in order to identify the fit of the research model and the causation among factors. According to the results of the analysis, the reliability and the model fit were appropriate for interpretation, and safety participation was shown to affect safeness of work environment more than safety compliance. The results of this study may serve as the reference for taking a measure to improve the level of safeness of the work environment felt by workers in the manufacturing industry.
Self-Consciousness about Ageing and Accident Prevention of Aged Workers
Lim, Hyeon-Kyo ; Kim, Heon ; Song, Jae-Chul ; Chang, Seong-Rok ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 84~91
It is well known that Korea has got in an aged-society, and the speed of ageing is remarkably fast that has never seen before in the world. In spite of that, government officers and managers who are in charge of industrial safety seldom have interest in ageing workers, and much less ageing workers for themselves in the industrial fields. In the meanwhile the number of injured aged workers keeps going on and even increasing. Therefore this research was carried out to investigate the characteristics of aged workers on one hand, and to grasp the self-consciousness level of industrial workers on the problem of ageing. Furthermore, to develop countermeasures, opinions and hopes of middle managers in small- and medium-sized enterprises who were in charge of industrial safety and health were collected also. Though the reply rate was not so high as expected, opinions of safety and health managers were somewhat appropriate. They replied that the most urgent counterplan for ageing would be improvements of work environments followed by work assignments based upon personal aptitude. On the other hand, the self-consciousness level of aged workers was lower than middle managers, and they mainly complained of surgical disorders such as musculoskeltal disorders including lower back pains. However, they did not seem to recognize they are getting lose their physical function in maintaining body equilibrium.
Effects of the Syllable Number, Font Type, Color Contrast, Display Type, Letter Size and Age Group on the Legibility of the Korean Characters
Song, Young-Woong ; Lim, Chang-Wook ; Lee, In-Seok ; Jung, Myung-Chul ; Mo, Seung-Min ; Kong, Yong-Ku ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 92~100
This study evaluated the effects of the syllable number(one, two), font type(gothic, myung), color contrast (black on white, white on black), display type(paper, LCD), age(20s, 60s) and character size(2~80pt) on the Korean characters' legibility. Total twenty subjects from two age groups (20s: n=10, 60s: n=10, five male and five female in each group) participated in the legibility test. A target panel was presented in the distance of 50 cm, and subjects conducted a reading tests for, in total, 16 treatment conditions (full combination of syllable number, font type, color contrast and display type). Results showed that two-syllable words revealed better legibility than one-syllable character. The main effects of the age, display type, font type, color contrast, and character size were statistically significant(p<0.01). Paper showed better legibility than LCD, particularly in the 20s and in the character sizes of less than 9pt. Gothic revealed more correct answers than Myung, particularly in the 60s, paper, and white on black conditions. It is expected that these results can provide basic data for the determination of the Korean characters' minimum legible size standards. For example, the minimum legible size for the Gothic and black on white characters presented in the paper should be 5pt for 20s and 1lpt for 60s if the 75% correct reading(3 correct answers in this study) was applied for the legibility criterion.
A Study on the Analysis of the Effect DFS installation on Urban Arterial Road
Choi, Hyun-Seok ; Kim, Hong-Sang ; Lim, Geun-Ho ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 101~112
Recently, with the existing speed-management by law enforcements and physical speed-reduction facilities, the country newly adopted Driver Feedback Sign (DFS) system, which displays driving speed in order to guide the driver to an advisable driving condition. DFS is mainly used in school zones due to reasons related to the ITS. Accordingly, because it is predictable that DFS will result in speed-reduction without legal forces and would have an effect on physical speed-reduction facilities, intersection, crosswalks, and road-alignments, this study will try to verify the efficiency of DFS by researching the vehicle speed in national highways and school zones, which have similar conditions to the urban arterial road. In consequence, on national highways, the drivers had a tendency to travel according to the road-environment such as urban arterial road and not reduce speed voluntarily. In school zones, drivers tend to reduce speed in mornings and afternoons when children travel to school or home, showing that the resulting effect is different according to the road-environment where DFS is installed, and the time slot of the DFS.
A Study on Safety Oriented System Design of Highway Advisory Radio Service
Chung, Sung-Hak ;
Journal of the Korean Society of Safety , volume 24, issue 5, 2009, Pages 113~121
The objective of this study is to develop highway advisory radio service for road safety oriented system design of the point by regional groups or geographical distributions. To develop these highway advisory radio service, traffic information provided service areas, responds for incident and accident, and road condition in service sections based on traffic information of highway advisory radio service. This study contributes to service of traffic information for safety driving, which is transport congestion areas and recognition of traffic congestion status in advanced traffic information service. As result of this study, systematic design of the advanced highway and traffic safety guides to management systems by highway advisory radio service.