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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 19, Issue 4 - Dec 2004
Volume 19, Issue 3 - Sep 2004
Volume 19, Issue 2 - Jun 2004
Volume 19, Issue 1 - Mar 2004
Selecting the target year
A Study of Heat and Smoke Exhaust to Subway Tunnel Direction
Rie, Dong-Ho ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 1~8
This study aims to derive the operation method of a comprehensive ventilation system which is capable of providing passengers with safe exit paths from platforms in onboard fire situations. To accomplish this, the airflow distributions in subway platforms under 6 types of tunnel vent system were calculated in addition to having analyzed diffusion behaviors of smoke and heat exhaust in such states by performing 6 kinds of different ventilation scenarios in a 3-D Fire Dynamic Simulation (FDS) simulation model. In order to recommend the mechanical smoke exhaust operation mode, Subway Environmental Simulation(SES) is used to predict the airflow of the inlet and outlet tunnel for the subway station to clarify the safety evaluation fir the heat and smoke exhaust on subway fire events.
A Numerical Study of a Room Fire for Fire Sizes II. wall fire and corner fire
Ko Kyung-Chan ; Park Woe-Chul ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 9~13
To confirm the previous finding that FDS predicts a fire growth rate too rapid compared with an experiment in a center fire in a room with an opening, the same computational fluid dynamics was applied to two types of fires, wall fire and comer fire. First the grid size was chosen to eliminate possible numerical errors due to a coarse grid system. Then the two types of fires were simulated for three different fire sizes, 7.65, 21.25, and 51.57kW for each type, which are the same as in the experiment to be compared with. The fires were predicted to grow too fist although the average temperatures and heights of the neutral planes were in good agreement with measurement.
Evaporation Cooling of Droplet due to Surface Roughness under Radiative Heat Input Condition
Bang Chang-Hoon ; Kwon Jin-Sun ; Yea Yong-Taeg ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 14~19
The objective of the present work is to examine evaporation cooling of droplet due to surface roughness under radiative heat input condition. The surface temperatures varied from
on aluminum alloy (AL 2024) and surface roughness was
. The results are as follows; Regardless of surface roughness under radiative heat input condition, as droplet diameter is larger, the in-depth temperature of solid decreases and evaporation time increases. In the case of
of surface roughness, the larger the surface roughness is, the less the evaporation time is and the larger the temperature within the solid is. In the case of
evaporation time and time averaged heat flux for radiative heat input case is shorter than for the conductive case.
Application of Light Collecting Probe with High Spatial Resolution to Spark-Ignited Spherical Spray Flames
Yang Young-Joon ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 20~25
In order to obtain the flame Propagation speed in freely falling droplet suspension Produced by an ultrasonic atomizer, a light collecting probe named Multi-color Integrated Cassegrain Receiving Optics (MICRO) is applied to spark-ignited spherical spray flames. Two MICRO probes are used to monitor time-series signals of OH chemilumine-scence from two different locations in the flame. The flame propagation speed is calculated by detecting the arrival time difference of the propagating flame front. In addition, time-series images of OH chemiluminescence are simultaneously obtained by a high-speed digital CCD camera to ensure the validity of the MICRO system. Furthermore, relationship between the spray properties measured by phase Doppler anemometer (PDA) and the flame propagation speed are discussed with k different experimental conditions by changing the fuel injection rate. It was confirmed that the MICRO probe system was very useful and convenient to obtain the flame propagation speed and that the flame propagation speed was different depending on the spray properties.
Structural Changes of Polyvinylidene fluoride with
Lee Chung ; Kim Ki-Yup ; Ryu Boo-Hyung ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 26~31
The radiation-induced changes taking place in poly(vinylidene fluoride) (PVDF) exposed to
irradiation were investigated in correlation with the applied doses. Samples were irradiated in air at room temperature by
to doses in the range of 200 to 1000kGy. Various properties of the irradiated PVDF were studied using FTIR, differential scanning calorimetry (DSC), gel fraction and elongation.
irradiation was found to induce changes in chemical, thermal, mechanical and structural properties of PVDF and such changes vary depending on the radiation dose.
A Study on the Ignition of Hydrogen-Air Mixture Gas by Spark of Rechargeable Battery
Lee Chun-Ha ; Kwon Byung-Cuck ; Oh Jong-ryong ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 32~39
This papers describes on the experimental consideration for the intrinsically-safe explosion-proof capability of rechargeable battery's body about main item rechargeable battery and cellular phone battery which is selling in domestic that IEC(International Electrotechnical Commission) recommend the measurement of ignition limit by short circuit of rechargeable battery and temperature increase test to use a explosion grade Group IIC type of explosion-proof type apparatus test an object of hydrogen gas. Because of that there are many different results for existence or nonexistence for ignition by different company and different types. It is concluded that the maximum of self temperature increasing by spark circuit of rechargeable battery is
in case of Nickel-Hydrogen and
in case of Nickel-Cadmium. The reaction of cellular battery for external temperature have following processes. It is confirmed that the temperature of reaction is rise slantly as the ambient temperature rising, then exterior shape of one is swell up and change when the temperature of ambient reach to about
, and when reach to about
the battery is blown up. Therefore, it is considered that have to be in considering selection of rechargeable battery using in itself due to different ignition limits of various rechargeable battery when the portable electric containing rechargeable battery are designed, produced and used, the characteristics and the proper safety factors of devices.
A Study on the Absorptive Removal of Magnesium ion and Calcium ion for Corrosion Prevent
Hong Sung-Uk ; An Hyung-Hwan ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 40~44
To the removal of hardness materials, we've test the absorptive capacity of main material
on the using the activated carbon powder saturated in 0.1M Nitrilotriacetic acid by experimental methods. The absorptive properties of
were measured with absorbent quantity and contact time., and investigated the physical properties of overall rate constant and adsorption constant adsorption isotherm, and Langmuir and Freundlich constant. In case of k' adsorption rate constants of
, was 0.00299, 0.00529 by Bhattahary and Venkobachar equation.
was 0.00373, 0.00640 according with adsorption rate constants of Lagergren.
A Study on the Flame Behavior of Whirl Eire and Pool Fire
Oh Kyu-Hyung ; Kang Youn-Ok ; Lee Sung-Eun ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 45~50
4-panel of 1m height and 45cm width were fixed on the
bottom plate and the opening of the panel comer was 5cm. Diameter of stainless vessel is loom and its height is 2cm and it located at the center of the bottom plate. 78mL liquid fuel was filled in the vessel and its depth was 1cm. Flame temperature was measured with K type thermocouple, and radiation heat of flame was measured with heat flux meter. Flame height and its behavior was visualized with video camera. and mass burning rate was measured by fuel combustion time. According to the development of fire, flame swirling was begin. From the experiment the mass burning rate was larger and the height of flame was higher than the usual pool fire flame. Flame temperature and heat flux also increased far more than the pool fire. Consequently the swirling air flow through the openings between the panel and thermal buoyance contribute to increase of heat release rate, flame length and mass burning rate.
Preparation and Properties of Polymer Blends Type Humidity Sensor for Process Safety
Kang Young-Goo ; Cho Myoung-Ho ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 51~56
Conductive polymer blends and composites are widely used for different safety application such as electrostatic charge dissipation(ESD), electromagnetic interference(EMI) shielding, electrostatic prevention and safety chemical sensor. In order to prepare a impedance-type humidity sensor that is durable at high humidities and high temperature, electically conductive polymer blends based on diallyldimethylammonium chloride(DADMAC) and epoxy were prepared in this study. The polymer blends type conductive ionomer exhibits reaction each other DADMAC and epoxy in FT-IR and DSC analysis. The blends material was traced by new peak at 1600cm-1 and appeard improvement of thermal resistance by melting point shift. Alumina substrate was deposited a pair of gold electrodes by screen printing. The blend material were spin-coated with a thin film type on the surface of alumina substrate. The polymer bleld type sensor exhibits a linear impedance increasing better than DADMAC coated humidity sensor. Also it shows good sensitivity, low hysteresis and durability against high humidity.
A Study on the Removal of an Heavy Metal Ions by an Functional Nano Fibers
An Hyung-Hwan ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 57~64
This is the study for the removal of a toxic heavy metal ions and the recycling of expanded polystyrene wastes. Thus expanded polystyrene wastes collected from the packing materials of TV or chemicals and dissolved by
solvent(N, N-Dimethylacrylamide), electrospun in DC 20kV by power supply. Generally, the electrospinning is a process of manufacture to the fibers of nanosize from polymer solution. Manufactured nanofiber mats by electrospinning were sulfonated by cone.-sulphuric acid with
catalysts for the exchange capacity of heavy metal ions and the properties of structure with sulfonated time investigated by FESEM(Feild Emission Scaning Electron Microscope). The ion exchange capacity of light metal
, Cd(II) and Ni(II), and by a nanofiber mats were 1.94[mmo1/g-dry-mat), 1.72(mmol/g-dry-mat), 1.24(mmol/g-dry-mat), respectively., and water uptake content showed a similar trend with IEC. and The selectivity coefficients
of Cd(II), Ni((II) ions showed 0.324, 0.228. respectively
A Study on The Effect of Humidity and Temperature of Hydroxy Propyl Methyl Cellulose Dust
Lim Woo-Sub ; Mok Yun-Soo ; Choi Jae-Wook ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 65~69
This study was performed with Hartmann type dust explosion apparatus and Godbert-Greenwald furnace apparatus in order to research the effect of temperature and humidity affecting LEL, minimum ignition temperature of Hydroxy Propyl Methyl Cellulose. The experimental determinations in the range between
of temperature was not affected
but LEL showed
. As the change of humidity LEL was
but dust explosion didn't occur over
. The ignition temperature of HPMC dust clouds was increased as increasing of humidity. So, the minimum ignition temperatures at
of humidity was
A Study on the Practical lighting Guide for Night Work
Ro Min-Lae ; Son Ki-Sang ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 70~77
A Reasonable lighting should be provided for doing night work. All works far construction site can be exposed to potential hazard at night work The purpose of this study is to provide a standard of the lighting against accidents due to insufficient lighting at site. one pilot tea one at building work site, one at mad work site of it have been conducted for figuring out illumination change depending worker's activity direction, using lux checker to show it as numerical indication. The direction are changed with a range of 30, 60, 90, and 135 degree to be checked at site. Tests results show that
of lighting could be decreased by changing the working direction of works at site. Therefore, steep slope place, cave work and backside of structural elements such as a column, deep beam should be considered for keeping sufficient and reasonable lighting. It is found that
illumination Lux needs f3r civil work than for building work
A Comparative Analysis of Existing Channel-Type Lining Board and New-Type lining Board Models
Kim Doo-Hwan ; Kim Young-Sei ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 78~83
The channel-type lining board that partial welded on many partition frames is used to normal servicing lining board type. On this study is to investigate existing channel-type lining board's capacity by using the static loading test. From this study, to develop new-type lining board which reflect well cross section area and sectional modulus of existing channel-type lining board. Six types FEM model are adopted. The accumulated test results of stress conditions and deflections by section shapes will be used to analyzed the relation between the capacity and the section shape. With the comparing the results of static loading test and FEM analysis.
A Study on the Indwelled Accident Factors in Small & Medium-Sized Construction Sites Utilizing Safety Consulting Data
Hong Sung Man ; Yoon Young Goo ; Kweon Dae Chul ; Park Peom ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 84~88
Accident of small and medium-sized construction sites happens much than large-sized construction sites. The safety consulting for accident prevention of construction sites has been launched in 1995. This research probed latency accident of small and medium-sized construction sites. By method, we used that result data of safety consulting for accident prevention of small and medium-sized construction sites. As a result a fall was examined by the most latency accident factor. In this study, a fall and electric shock, descent, fall down in ground, a fire was examined weighty accident factor of small and medium-sized construction sites.
Comparison of Diffusion Characteristic of Chloride According to the Condition of Hardened Concrete
Leem Young-Moon ; Yang Eun-Ik ; Min Seok-Hong ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 89~94
Most reinforcements in concrete are constructed by steel. Corrosion of reinforcement is the main cause of damage and early failure of reinforced concrete structures. The corrosion is mainly professed by the chloride ingress. In general, chloride in concrete can be discriminated by two components, total chloride and fire chloride. This paper provides a testing method on the coefficient of chloride diffusion in concrete and the relationship between total chloride and free chloride in concrete for the composition of predicting model on diffusion rate of chloride. In order to complete this predicting model, this study will use chloride penetration characteristic, diffusion coefficient and experiment of color change on silver nitrate solution. This predicting model is going to help that grasp special quality on salt content inclusion of concrete structure that is exposed in chloride environment. Accurate predicting model can be effectively used not only in selecting of repair time but also in preventing from various deteriorations.
Characteristics of Skin Friction on Compression Loaded Group Piles
Ahn Byung-Chul ; Lee Jun-Dae ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 95~100
H-pile can be more easily driven than pipe pile by pile driver and shows high skin friction and plugging effect. And lately It is well grown that the high strength H-pile has been widely used f3r pile foundations. To compare the skin frictions of H piles under different density soil conditions, this paper presents results of a series of model tests on vertically loaded group piles. 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 compression load for group piles increases as number of piles increase and piles space ratic decrease to
of soil density. The analysis also found that the theoretical value of skin friction for group piles is greater than practical value as piles space ratio increases to
of soil density. Piles showed the greatest difference of the skin friction in case that the pile space ratio(S/D) is 6. The theoretical value by Meyerhof and DM-7 showed 1.83 times and 1.32 times respectively as great as practical value in case of S/D=6 and
The Property of Building Construction Accident According to the Analysis of Building Accident Cases
Lee Jong-Bin ; Ro Min-Rae ; Go Seong-Seok ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 101~107
Recently, construction work's tendency has become a high-rise building, a complexity and a large size. According to the KOSHA data, construction work accidents have not been decreased. Looking at from the side of accident accidents of construction industry are occupied over 1/3 among all industry accidents. Therefore, this study will analyze the accident of the building construction work from the data of KOSHA which were collected during 11 years
data relating to serious accidents of the building construction work suggest the counterplan according to the each work type in building construction work
Dynamic Analysis of Rectangular Liquid Storage Structures Excited by Horizontal and Vertical Ground Motions
Park, Jang-Ho ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 108~117
Dynamic analysis method is Presented for analyzing rectangular liquid storage structures excited by horizontal and vertical ground motions. The irrotational motion of invicid and incompressible ideal fluid in rigid rectangular liquid storage structures subjected to horizontal and vertical ground motions and the motion of fluid induced by structural deformation are expressed by analytic solutions. Analysis methods are obtained by applying analytic solutions of the fluid motion to finite element equation of the structural motion. The fluid-structure interaction effect is reflected into the coupled equation as added fluid mass matrix. The free surface sloshing motion, hydrodynamic pressure acting on the wall and structural behavior due to horizontal and vertical ground motions are obtained by the presented method.
The Development of the Korean Life Change Unit Model for Accident Prevention - Focused on the Married Workers Living in the Middle Area -
Kang Young-Sig ; Choi Man-Jin ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 118~123
The more the lift environment eastern idea, culture, factory automation system and information technology complicates, the more the various human error brings about. It brings about all kind of accidents and occupational diseases. Also the death and sickness or injury by psychological stress among the human error has increased every year. Therefore this paper describes the Korean lift change unit model through statistical testing with the proposed life change unit factors on the married workers living the middle area. The proposed model can be simply used in order to minimize the industrial accident and human error in real fields. Finally, the result will be helpful for the better safety management.
Computation of Nonpremixed Methane-Air Flames in Microgravity II. Radius and Thickness of Flame
Park Woe-Chul ;
Journal of the Korean Society of Safety , volume 19, issue 3, 2004, Pages 124~129
To evaluate the numerical method in simulation of diffusion flames and to see the effects of strain rate and fuel concentration on the flame radius and thickness, the nonpremixed methane-air counterflow flames in microgravity were simulated axisymmetrically by using the MST Fire Dynamics Simulator (FDS). The
based flame radius and thickness were investigated for the mole fraction of methane in the fuel stream,
and the global strain rates
for each mole fraction. The flame radius increased with the global strain rate while the flame thickness decreased linearly as the global strain rate increased. The flame radius decreased as the mole fraction increased, but it was not so sensitive to the mole fraction compared with the global strain rate. Since there was good agreement in the nondimensional flame thickness obtained with OPPDIF and FDS respectively, it was confirmed that FDS is capable of predicting well the counterflow flames in a wide range of strain rate and fuel concentration.