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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 25, Issue 6 - Dec 2010
Volume 25, Issue 5 - Oct 2010
Volume 25, Issue 4 - Aug 2010
Volume 25, Issue 3 - Jun 2010
Volume 25, Issue 2 - Apr 2010
Volume 25, Issue 1 - Feb 2010
Selecting the target year
Fatigue Strength Evaluation of Adhesive Bonded and Mechanical Pressed Joints of Cold Rolled Steel Sheet
Kim, Ho-Kyung ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 1~8
The tensile and fatigue experiments were conducted with tensile-shear specimens for investigating the strength of adhesive bonded and mechanical press joints of SPCC steel sheet used in the field of the automobile industry. The optimal punch press force was evaluated 50kN for combining epoxy adhesive bonding and mechanical press joining with a diameter of 8.3mm using SPCC sheet with a thickness of 0.8mm. The combining epoxy adhesive bonding and mechanical press joining exhibits the maximum tensile force of 750N. The fatigue strengths of the combination of adhesive bond and mechanical press joint and pure adhesive joint were evaluated 370N and 320N at 106cycles, respectively. These values correspond to 22% and 20% of their maximum tensile forces, respectively. However, the fatigue strength of the combination of adhesive bond and mechanical press joining was much lower than that of pure mechanical press joining.
Pollutant Formation Characteristics in a Flamelet Interacting with a Vortex
Oh, Chang-Bo ; Lee, Eui-Ju ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 9~16
Flame structure of diffusion flame interacting with a single vortex was investigated with direct numerical simulation (DNS). A well-known counterflow diffusion flame was used as an initial flat flame and single vortices were made by issuing a high-velocity jet abruptly in fuel- and air-side. The variations in the maximum concentration of major species (CO and
) and NOx (NO and
) with the stoichiometric scalar dissipation rate were investigated. Unsteady effects in the species concentration variation of the flame interacting with a vortex were identified by comparing with that of steady flame.
formation characteristics of the flame interacting with a vortex were well understood by investigating the
formation. To enhance the prediction performance in the fire simulation, current turbulent combustion modelings are needed to be modified by adopting the unsteady effects in the species concentrations of diffusion flame interacting with a vortex.
Characteristics of Chemical Reaction and Ignition Delay of
Lee, Eui-Ju ; Oh, Chang-Bo ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 17~21
The chemistry and ignition delay of hydrogen/air/HFP premixed mixtures was investigated numerically with unsteady perfectly stirred reactor(PSR). The detailed chemistry of 93 species and 817 reaction mechanism was introduced for hydrogen/air/HFP mixtures. The results shows the temporal concentration variations of major or reactants such as hydrogen and oxygen during autoignition were similar to the spatial distribution of premixed flame while water vapor produced at the ignition temperature was decomposed later, which can be clarified with the relate species production rates that the the re-growth (or shoulder) of OH concentration is a result of F radicals attacking
forming OH and HF. For the stoichiometric
/air mixture inhibited by 20% HFP, HFP thermal decomposition reaction prevails over the radical attack such as H at initial stage. Even though relatively large HFP addition contributes to delay the ignition, chemical effect on the ignition delay is not effective because of late thermal decomposition of HFP. The most small ignition delay was observed at a slightly fuel lean condition (
= 0.9), and temperature dependency of ignition delay was clearly shown near 900 K.
Evaluation of Material Degradation of 1Cr-1Mo-0.25V Turbine Casing Steel Aged Artificially by Isothermal Heat Treatment
Ma, Young-Wha ; Kim, Do-Hyung ; Yoon, Kee-Bong ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 22~26
Material degradation should be considered to assess integrity and residual life of high temperature equipments. However, the property data reflecting degradation are not sufficient for practical use. In this study, mechanical properties of 1Cr-1Mo-0.25V casting steel generally used for turbine casing were measured and variation of microstructure was observed. Degradation was simulated by isothermal heat treatment.
A Study on the Removal of Electrostatic using Transmitted Ions Generated Soft X-ray with Compressed Air
Kwon, Sung-Yul ; Lee, Dong-Hoon ; Choi, Jae-Wook ; Seo, Min-Seok ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 27~31
It is a well known fact that the LCD and Semiconductor Devices are a central part of IT industry which is important in the present and the future. But the biggest problem of Semiconductor and LCD manufacturing is maintaining a cleaning room environment. For this reason, the soft X-ray type Ionizer was used as the electrostatic reducer device, which protects damage of the product against electrostatic discharge in the manufacturing process. Therefore it is a essential important factor during Semiconductor and LCD production process. But the soft X-ray has a intrinsic problem with harmful to human being in case of soft X-ray exposure. That's reason we have the research to solve above problem and made an apparatus that it was covered with shielding structure to protect X-ray radiation to outside. And besides, it has a possibility to eliminate the charged electrostatic in the narrow space through the slot for Ion emissions with dual soft X-ray sources on the both side. It is also not make the particles from itself when it has been operated.
A Study on the Fire Risk Assessment of Combustible Exhaust Duct-fume
Yoon, Yeo-Song ; Lee, Young-Soon ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 32~37
When back-out & firing Process applies heat, hume is piled up in exhaust duct by organic compound and it have high dangerousness. There by, the process is happening a lot of damage that is exhaust duct fire. However we do not have certain fire dangerousness estimation and digestion countermeasure. So we need preventive measure. Back-out & firing is a process which has fine structure, electrical and mechanical characteristics, such as firing kiln and back-out kiln which has pipe line and box type. The box oven is made of heating coil, fan motor and control panel. Back-out & firing process has air circulation institution of quick ventilation type. When we operate this process for long time, fire can break out easily. Duct is made by zinc shredder. If fire breaks out in duct inside, fire by deposit fume can be dispersed easily. Accordinglym, This project estimate danger for back-out & firing process exhaust duct through real fire test. And there is purpose of study to establish preventive measure.
Evaluation of Smoke Density and Noxious Gas for Phenol Foam Insulation
Park, Hyung-Ju ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 38~43
The smoke density and noxious gas for phenol foam and polyurethane foam were measured according to test methods in ASTM E 662 and KS F 2271. It was observed that phenol foam had the possibility of application for sandwich panel and board compared with polyurethane foam. In the experimental results, phenol foam showed comparatively excellent property than polyurethane foam in smoke density and noxious gas. The polyurethane foam showed comparatively high smoke density and didn't meet the evaluation standard of noxious gas in KS F 2271. From the experimental results of smoke density and noxious gas, it can be said that phenol foam has both comparatively good safety and high possibility of application than polyurethane foam in the building fire of sandwich panel structure because of lower smoke density and noxious gas.
A Study on the Quantitative Analysis and Estimation for Surround Building caused by Vapor Cloud Explosion(VCE) in LPG Filling Station
Leem, Sa-Hwan ; Huh, Yong-Jeong ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 44~49
This paper is estimation of structure damage caused by Explosion in LPG(Liquefied Petroleum Gas) filling station. As we estimate the influence of damage which occur at gas storage tank in filling station. We can utilize the elementary data of safety distance. In this study, the influence of over-pressure caused by VCE(Vapor Cloud Explosion) in filling station was calculated by using the Hopkinson's scaling law and the accident damage was estimated by applying the influence on the adjacent structure into the probit model. As a result of the damage estimation conducted by using the probit model, both the damage possibility of explosion overpressure to structures of max 265 meters away and to glass bursting of 1150 meters away was nearly zero in open space explosion.
Safety Management Priority Classified by Participants in Planning & Design Stages
Song, Do-Heom ; Yeo, Sang-Ku ; Go, Seong-Seok ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 50~56
The safety accidents of domestic construction happened more than other industries is performed only under the construction stage. In the foreign countries, however, owners and designers play an important role on safety in an early stage. Therefore, numerous studies were carried out by getting rid of accident risks and institutionalizing prevention activities in an construction stages. Accordingly, this study have performed to deduce the pivotal point of safety management items classified by the subject suitable for construction by introducing of safety conception of domestic and international design and suggested the improvement methods of safety management plans of the planning design stage so as to perform more efficient safety management.
A Study on the Buckling Characteristics of Steel Pipe Scaffold
Paik, Shin-Won ; Song, In-Yong ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 57~61
Formwork is a temporary structure that supports its weight and that of fresh concrete as well as construction live loads. Scaffoling is a temporary frame used to support people and material in the construction or repair of buildings and other large structures. It is usually a modular system of metal pipes, although it can be made out of other materials. Bamboo is still used in some Asian countries like China. The purpose of a working scaffold is to provide a safe place of work with safe access suitable for the work being done. In construction site, steel pipes are usually used as scaffolds. In this study, scaffolding systems which is changed according to sleeper and joist space were measured by buckling test. Buckling load of respective scaffolding system was analyzed by structural analysis program(MIDAS). Buckling load of scaffold with/without wall connection and footboard was got by test and structural analysis. According to these results，we know that scaffolding system of case 3 is suitable. Buckling load of scaffold with wall connection is higher than without wall connection. So wall connection is important in scaffoling systems. Footboard in the scaffolding systems is not effective against promotion of buckling load. Finally, the present study results will be used to design scaffolding systems safely in the construction sites.
A Study on the Cause Analysis of Fall Accidents at Temporary Construction Sites
Kim, Hyang-Jeon ; Paik, Shin-Won ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 62~64
Since 1990 in South Korea, the considerable concern for the safety of construction sights has been increased due to serious accidents. There have been numerous big improvements in preventing the accidents by strengthening legal enforcement and by continuing to emphasize the safety management. Further, the safety standards and criteria for temporary constructional work have been enacted and established in order to maintain safe work environments in temporary construction and structure settings. However, the death rate from fall accidents is still high in the temporary constructional and structural settings in comparison to other work places in construction. According to the analysis of accidents in the field of construction between 2000 and 2007, the death rate from fall accidents in the temporary constructional settings was highest. In addition, there have been more fall accidents in the work setting by small or medium construction enterprises rather than large enterprises due to the relative lack of the safety management. Thus, in this study, the analysis of the causes of fall accidents in the temporary constructional and structural settings between 2000 and 2007 was conducted. Moreover, a survey study was carried out in order to investigate further causes based on the analysis. Finally, this study was also conducted in order to provide basic information and knowledge about the prevention of future accidents.
An Effect of Repair & Retrofit of Stringer in Steel Plate Girder Railway Bridge with Fatigue Cracks
Hong, Sung-Wook ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 65~71
In this study, a series of finite element analysis using LUSAS were performed in order to assess the quantitative effects of repair and retrofit of stringer in steel plate girder railway bridge with fatigue cracks. And cutoff types of end part of upper flange were considered as right-angled type and round-angled type. Also, as a method of repair and retrofit of fatigue cracks in stringer, perforation of stop-hole and installation of bracket were considered. From the analysis result, it was possible to assess the fatigue safety and fatigue life of stringer with fatigue cracks, and to estimate the stress intensity factor range in cut-off part of stringer using J-integral method. Also, according to the method of perforation of stop-hole and installation of bracket, it was possible to calculate the crack propagation life at the cut-off part of stringer.
Comparison of Laboratory Safety Management States in Organization Type and Research Field by using a Checklist
Park, Jae-Hee ; Han, Ou-Sup ; Gal, Won-Mo ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 72~78
Laboratory accidents have happened incidently. However, laboratory safety management has been out of concerns for a long time. At last, the Korean government established an act called Establishment of safe environment of laboratories in 2005. To support the act and to establish policies on laboratory safety management，a national-wide survey was conducted for the 74 research organizations sampled and their 201 laboratories. For the survey, a safety management checklist with 114 items grouped into 20 categories was developed By using this checklist, safety expert groups investigated the laboratories and evaluated them on the five-point Likert scale. A statistical analysis was conducted to compare the safety management status between different research organization types and between different research fields. The resultsmanaw that the universities are in significant lower level on safety institution and safety education than the public research organizations and theare poration research organizations. In terms of research field, chemistry/chemical engineering laboratories generallymanaw higher level compared with theaothers. Conversely, biology/life science laboratories marked low levels in a number of checklist items.
Evaluation of the Alternative Safety Signs for the Hazard of Nano Materials
Park, Jae-Hee ; Yoo, Hyun-Seung ; Smith-Jackson, Tonya ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 79~86
Although nano materials are used a lot in industries, there has not been any standard nano hazard graphic symbol. An experiment was conducted to know the comprehension ratio of newly designed eight nano graphic symbols. To compare the symbols with existing safety graphic symbols, other sixteen symbols were also included. 54 subjects evaluated the difficulties of graphic symbols on seven point Likert scale and answered the meaning for each symbol. The all eight nano safety symbols marked under 30% comprehension ratio. However, one of them didn't show any statistically significant difference with other existing safety symbols as like bio hazard, radiation, and laser. Therefore the nano symbol tested in the best could be adopted as the nano safety graphic symbol if it is sufficiently exposed in training period and used with warning label. The workers in industries using nano materials can be alerted and protect themselves where the sign is attached.
A Study on the Improvement for EMU Maintenance System of Urban Transit
Kim, Kyu-Joong ; Lee, Keun-Oh ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 87~92
Urban transit system must secure fast, safe and reliable transportation capacity as a metropolitan mass transit. For this purpose, it is important to make all the sub-systems (which consist of EMU, power feeding, signaling & telecommunication, railway, platform facility, and control system and so on) work well. To operate all the systems effectively and reliably, a maintenance measure optimal to each system's characteristics is needed to be established and executed. So, highly reliable maintenance should be performed. But, EMU maintenance methods suitable to its own model and EMU lines are not yet introduced. This study examined few examples mainly to secure reliability on a maintenance quality in operating method and the features of train maintenance system based on travel distance.
Development and Application of Safety Activity Process for Railway Signaling Systems
Hwang, Jong-gyu ; Jo, Hyun-Jeong ; Han, Chan-Hee ; Cho, Woo-Sick ; Ahn, Jin ;
Journal of the Korean Society of Safety , volume 25, issue 1, 2010, Pages 93~101
As safety-related regulations for signaling systems are standardized to IEC 61508/62278/62425, and others at the international level, safety activities and its assessment are required to be performed. And also there is the need to develop technologies for safety improvement to secure safety signaling systems in terms of technologies for safety activities on each life-cycle. In this paper we have developed the safety activity processes and technologies each steps of proposed processes respectively for railway signaling systems. And the proposed process and technologies are applied to the safety activities for mock-up signaling systems.