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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 30, Issue 6 - Dec 2015
Volume 30, Issue 5 - Oct 2015
Volume 30, Issue 4 - Aug 2015
Volume 30, Issue 3 - Jun 2015
Volume 30, Issue 2 - Apr 2015
Volume 30, Issue 1 - Feb 2015
Selecting the target year
Evaluation to Collision Safety Performance of Stacking Angle Different CFRP/Al Circular Member
Yang, Yong Jun ; Kim, Young Nam ; Cha, Cheon Seok ; Jung, Jong An ; Yang, In Young ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 1~6
DOI : 10.14346/JKOSOS.2015.30.6.1
The actual condition is that environmental pollution due to the development of various industries has recently become a serious issue. An interest in improving the gas mileage is rising due to an increase in the number of vehicles in the era of high oil price in particular. In order to solve this problem, priority should be given to light-weight design of car body, However, at present, a design method enabling the conventional steel plate to be replaced is direly needed in order to guarantee passengers' safety according to excessive light-weight design of car body. In this study, in order to apply a design method that could realize fuel savings and environmental pollution prevention through an improvement in gas mileage together with meeting the safety requirements for vehicles, it was supposed that CFRP/Al composites member would be used as primary structural member. And to this end, it was intended to obtain optimum design data by experimentally implementing external impulsive load applied to the car body. According to results of impact test of CFRP/Al composites member, a collapsed shape of folding, crack, and bending occurred. So, it was possible to find that energy was observed. And in case of specimen having an angle of
in the outermost layer and stack sequence of
, its collapsed length was shown to be short. Therefore, it was possible to find that the absorbed energy was shown to be higher by 20% or above at the maximum.
Evaluation of the Impact Shear Strength of Thermal Aged Lead-Free Solder Ball Joints
Chung, Chin Sung ; Kim, Ho Kyung ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 7~11
DOI : 10.14346/JKOSOS.2015.30.6.7
The present study investigates the impact shear strength of thermal aged Sn-3Ag-0.5Cu lead-free solder joints at impact speeds ranging from 0.5 m/s to 2.5 m/s. The specimens were thermal aged for 24, 100, 250 and 1000 hours at
. The experimental results demonstrate that the shear strength of the solder joint decreases with an increase in the load speed and aging time. The shear strength of the solder joint aged averagely decreased by 43% with an increase in the strain rate. For the as-reflowed specimens, the mode II stress intensity factor (
) of interfacial IMC between Sn-3.0Ag-0.5Cu and a copper substrate also was found to decrease from
in the speed range tested here. The degradations in the shear strength and fracture toughness of the aged solder joints are mainly caused by the growth of IMC layers at the solder/substrate interface.
An Experimental Study on the Impact Energy Absorption Mechanism of CFRP/Al Compound Square Tube
Hwang, Woo Chae ; Cha, Cheon Seok ; Yang, Yong Jun ; Jung, Jong An ; Yang, In Young ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 12~17
DOI : 10.14346/JKOSOS.2015.30.6.12
In this study, the collapse characteristic of CFRP/Al compound square tube was investigated experimentally. The conclusions are as follows; The impact collapse characteristic of CFRP/Al compound square tube was found to be the most superior stacking conditions
. It showed that a very stable collapse mode was crushing. In the member with
, stacking conditions,
fibers were splayed to the external by laminar bending, while the
fibers were held between the folds of the aluminum member by laminar bending, local buckling and transverse crack. In the member with
stacking conditions, fibers were held between the folds of the aluminum member by local buckling and transverse crack.
Effects of Initial Condition and Opening Geometry of a Compartment on the Gravity Current in the Backdraft
Park, Ji-Woong ; Oh, Chang Bo ; Han, Yong Shik ; Do, Kyu Hyung ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 18~25
DOI : 10.14346/JKOSOS.2015.30.6.18
Computational study of a gravity current prior to the backdraft was conducted using fire dynamic simulator (FDS). Various initial conditions of mixture compositions and compartment temperature as well as four opening geometries (Horizontal, Door, Vertical, and Full opening) were considered to figure out their effects on the gravity current. The density difference ratio (
) between inside and outside of compartment, the gravity current time (
) and velocity (
), and non-dimensional velocity (
) were introduced to quantify the flow characteristics of the gravity current. Overall fluid structure of the gravity current at the fixed opening geometry showed similar development process for different
for entering air to reach the opposed wall to the opening geometry increased with
. Door, Vertical, and Horizontal openings where openings are attached on the ground showed similar development process of the gravity current except for Horizontal opening, which located on the middle of the opening wall. The magnitude of
was, from largest to smallest, Full > Vertical > Door > Horizontal, but it depended on both the size and location of the opening. On the other hand,
was found to be independent to
, and only depended on the geometry of the opening.
Safety Policies on Prevention of Industrial Accidents Associated with Industrial Machines and Devices
Choi, Gi Heung ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 26~33
DOI : 10.14346/JKOSOS.2015.30.6.26
This study suggests systematic procedures to improve safety policies on prevention of industrial accidents associated with industrial machines and devices. Specifically, new method of cause analysis of industrial accidents associated with industrial machines and devices is suggested and the related accident data are re-analyzed. Effectiveness of direct safety regulations such as safety certification, self-declaration of conformity, safety device regulation and safety inspection of industrial machines and devices are also analyzed. Based on those analysis results, transition from the current user-oriented safety device regulation to more balanced direct regulations on both manufacturer and user is suggested. Together with severity and frequency of industrial accidents, unit severity and unit frequency need to be taken into account to further assess the risk associated with a particular industrial machine or device. Balance between safety regulations will be realized by proper adjustment of lists of safety certification and inspection, and certification and inspection standards. This will also guarantee the maximum benefit over cost in such safety regulations.
Analysis for Electrical Fire Possibility Using Fuzzy Logic with Input Variables of Overcurrent and Saturation Time in the Indoor Wiring
Kim, Eun-Jin ; Kim, Doo-Hyun ; Kim, Sung-Chul ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 34~39
DOI : 10.14346/JKOSOS.2015.30.6.34
The study is aimed to develop fuzzy logic system that has overcurrent and saturation time as input variable and possibility of electrical fire as output variable by making bad conductor area with physical damage to indoor wiring. Most previous studies focused on thermal characteristics depending on the current size and no study considered the current size and saturation time at the same time. Therefore, the paper made into account current value and saturation time together. To this end, it created bad conductor area half the size of IV conductor (1.6 mm) on purpose and transmit electrical current from 10A to 60A by unit of 2A to find out the thermal characteristics and saturation time for current. Based on the data that came out, the study applied fuzzy logic and established the current and saturation time as input variable and chance of fire as output variable. As a result, the center of area of the system that depended only on the existing current value was 75 while the system that applied both current and saturation time presented the chance of fire at 92. It is found that the chance of bad conductor area and deteriorated insulation of electrical wire had current and saturation time as important variables. The data can be used as basic data like deteriorated wire insulation or operation features of circuit breaker in investigating the cause of electrical fire.
A Study on the Damaged Pattern of Dryvit by External Flame
Park, Young Ju ; Hong, Yi Pyo ; Lee, Hae Pyeong ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 40~47
DOI : 10.14346/JKOSOS.2015.30.6.40
In this study, temperature characteristics and fire damage form were analyzed to investigate flame spreading form and fire probability from ignition sources subject to drivit component materials which is finishing material in architecture. Ignition sources were limited to a gas torch and exterior panel board fire, and the size of the sample was manufacture in 30 cm length
50 cm height
5cm thickness size. Marble (inner wall) + 3 mm drivit (outer wall), marble (inner wall) + 4 mm plaster stone (outer wall), sandwich panel + 3 mm driver bit (outer wall), sandwich panel + 3 mm driver bit + insulation (outer wall), and gypsum board (inner wall) + 3 mm drivit (outer wall) were prepared for the sample. As result of the research for temperature characteristics, large temperature difference by each material was shown in
at 30 seconds and
at 300 seconds. Especially when the inner wall was a plaster board, lowest temperature of
was shown at 300 seconds and marble inner wall showed the following lowest temperature of
. Temperature rising over
was shown in other materials. Regarding fire damage form, drivit or gypsum board outer wall parts exposed to fire showed combustion and carbonization to show calcination(breaking phenomenon) and influence of heat exposure was higher as calcination became more severe.
Review of Safety for Pressure-Relieving Systems of Small to Middle Scale Chemical Plants
Yim, Ji-Pyo ; Jin, Dae-Young ; Ma, Byung-Chol ; Kang, Sung-Ju ; Chung, Chang-Bock ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 48~55
DOI : 10.14346/JKOSOS.2015.30.6.48
A variety of safety issues were investigated for chemical reactors using a toluene solvent in case of a fire at small to middle scale chemical plants. The issues covered the operation of pressure-relieving valves and the subsequent discharges of the toluene to the atmosphere either directly or through an absorber, which represent the current practice at most small chemical plants. It was shown that the safety valve on the reactor may not operate within about twenty minutes after an external fire breaks out, but, once relieved, the toluene vapor released directly to the atmosphere may form a large explosion range on the ground. It was also shown that if the discharge is routed to an existing absorber used for the scrubbing of volatile organic compounds or dusts, the column may not operate normally due to excessive pressure drops or flooding, resulting in the hazardous release of toluene vapors. This study proposed two ways of alleviating these risks. The first is to ruduce the discharge itself from the safety valve by using adequate insulation and protection covers on the reactor and then introduce it into the circulation water at the bottom of the absorber through a dip linet pipe equipped with a ring-shaped sparger. This will enhance the condensation of toluene vapors with the reduced effluent vapors treated in the packing layers above. The second is to install a separate quench drum to condense the routed toluene vapors more effectively than the existing absorber.
Analysis on the Current Evaluation items for the Performance-focused Management of the Concrete Retaining Wall
Lee, Dong Yul ; Seong, Joo Hyun ; Jeong, Hae Sang ; Oh, Tae Keun ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 56~62
DOI : 10.14346/JKOSOS.2015.30.6.56
Recently, one of countermeasures against aging SOC infrastructures, performance-focused management including the serviceability, functionality, durability, and economics has been changed from the structural safety-focused evaluation has changed into The current inspection and diagnosis for the major SOC facilities in Korea has been carried out by the specific principle of details, and most of them checked by the visual inspection are focused on the repair and rehabilitation of the damaged structures, thus they are the preventive maintenance. However, the performance-focused management should be replaced for the effective and economic maintenance as wells as for the minimization of the damage. In this regard, this study the appropriacy of the current evaluation items about the concrete retaining wall, one of SOC infrastructures as the previous step forward the performance-focused management. In order to deduct the effective evaluation items in order, the entropy, analytic hierachy process (AHP), and promethee analysis were peformed and the results were compared and discussed.
Inundation Simulation of Underground Space using Critical Dry Depth Scheme
Rhee, Dong Sop ; Kim, Hyung-Jun ; Song, Chang Geun ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 63~69
DOI : 10.14346/JKOSOS.2015.30.6.63
In this study, a 2D hydrodynamic model equipped with critical dry depth scheme was developed to reproduce the flow over staircase. The channel geometry of hydraulic experiment conducted by Ishigaki et al. was generated in the computational space, and the developed model was validated against flow properties such as discharge, velocity and momentum. In addition, the water surface profile and the velocity distribution evolved in flow over two layers staircases were analyzed. When the initial water depth at the upper floor was 0.3 m, the maximum velocity at lower floor was 4.2 m/s, and the maximum momentum was
, and its conversion to force per unit width was 1.2 kN/m. This value was equivalent to the hydrostatic force with 50 cm water depth, and evacuation became difficult, as proposed by Ishigaki et al. For the flow over staircases connecting two layers, the maximum run-up height in flat part connecting two layers was approximately two times higher than the initial water depth in upper floor, and the rapid shock wave with sharp front and long tail was propagated.
Governing Design Factors of GFRP-Reinforced Concrete Bridge Deck
Cho, Jeong-Rae ; Park, Young Hwan ; Park, Sung Yong ; Cho, Kunhee ; Kim, Sung Tae ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 70~77
DOI : 10.14346/JKOSOS.2015.30.6.70
In this study, the governing design factors of GFRP-reinforced concrete bridge deck are analyzed for typical bridges in Korea. The adopted bridge deck is a cast-in-situ concrete bridge deck for the prestressed concrete girder bridge with dimensions of 240 mm thickness and 2.75 m span length from center-to-center of supporting girders. The selected design variables are the diameters of GFRP rebar, spacings of GFRP rebars and concrete cover thicknesses, Considering the absence of the specification relating GFRP rebar in Korea, AASHTO specification is used to design the GFRP-reinforced concrete bridge deck. The GFRP-reinforced concrete bridge deck is proved to be governed by the criteria about serviceability, especially maximum crack width, while steel reinforced concrete bridge deck is governed by the criteria on ultimate limit state. In addition, GFRP rebars with diameter of 16 mm ~ 19 mm should be used for the main transverse direction of decks to assure appropriate rebar spacings.
A Study on Application of 2-Dimensional Flow Models to Inundation on Underground Space System
Kwak, Sunghyun ; Lee, Kyungsu ; Rhee, Dong Sop ; Lyu, Siwan ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 78~84
DOI : 10.14346/JKOSOS.2015.30.6.78
In order to increase the utilization of limited space in urban area, it can be a good solution to make use of underground space. For the last few decades, underground space systems, such as underground passages, subway stations, and underground shopping arcades, have been constructed in many cities all over the country. Despite of the advantages on the utilization of space in urban area, underground space systems have always been exposed to the risk of inundations resulted from severe rain storms. In this study, it has been examined to apply 2-D flow models (TUFLOW and FLUMEN) to establishing the preventive measures to the risk of flood. For the part with relatively complex configuration, such as a corridor junction, 2-D flow models present the detailed information about the effect of geometry on the inundation events and the temporal and spatial distribution of inundation over the space. From the result, it can be concluded that the 2-D flow model can be the effective implement for establishing the proper measure to the inundation on underground space systems, which generally have relatively long and narrow geometry with complex inner configuration.
Emergency Response Strategy for Mitigating Industrial Disasters on Construction Site
Shin, Eil Yong ; Song, Chang Geun ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 85~93
DOI : 10.14346/JKOSOS.2015.30.6.85
Construction sites have various risks, and safety managements are enforced based on the law such as Industrial Safety and Health Act, etc. Safety management by the law saves lives and preserves health of workers by removing and understanding risks in advance. When the emergency situation has come, poor response causes loss of lives and physical damages. This study suggests basic strategy that can mitigate the industrial disaster in all construction sites. A survey was conducted to identify the current safety consciousness and to evaluate first aid ability of coworkers. Finally, four measures were suggested: (1) designating muster points; (2) hiring occupational health managers; (3) increasing the first aid ability of coworkers; and (4) carrying safety brochure. The proposed suggestions can be helpful in mitigating the construction disaster, and in responding the major accident efficiently within a short time.
Numerical Simulation for Prediction of Existing Cavity Location on Explosion-Induced Building Collapse
Jung, Jahe ; Park, Hoon ; Kim, Kwang Yeom ; Shin, Hyu-Soung ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 94~101
DOI : 10.14346/JKOSOS.2015.30.6.94
When a severe disaster such as a building collapse occurs, a first priority for rapid rescue is to find a location where people are highly expected to be buried but alive. It is, however, very difficult to correctly designate the location of such cavities by conventional geophysical survey due to a pile of debris of building members. In this study, location of possible lifeguard cavities were evaluated through a series of simulations of building collapse by explosion depending on the height of the building, a structure of basement floor and a location of explosion. Three types of building structure: five-story, ten-story and fifteen-story were prepared as a model for the simulation. As a results, in the case of low building, only basement floor partially collapsed. On the other hand, in the case of high building, a collapsed range on the inside of the building increased and lifeguard spaces were formed only in the lateral side or corner of the building. In addition, when a wall exists in the basement floor, the possibility that cavities could be formed increased compared to the cases without wall. However, for the fifteen-story building case, no possible lifeguard cavity was found. It is noted that for a high rise building, the height of building more affect forming of safeguard cavity than the structure of the basement floor.
Field Research for the Durability Assessment Factor for deriving the Carbonation of Concrete Bridges in the Marine Environment
Chai, Won-Kyu ; Lee, Myeong-Gu ; Son, Young-Hyun ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 102~109
DOI : 10.14346/JKOSOS.2015.30.6.102
In this study, on the basis of the results of the field survey and the theoretical consideration for Korean Standard Specification for concrete durability and maintenance, the following conclusions are derived. From the survey, the prediction equation of carbonation depth for the southwest region in Korea is experimentally proposed,
, which predicts about 60mm of the carbonation depth for the concrete structures of 100 years, a 1st class of target endurance period, under a combined deterioration environment like a marine environment. Considering that the marginal value for a carbonation depth limitation under very severely marine environment is 25mm, in accordance with the Specification, it is found that the predicting carbonation depth for the concrete cover depths, 100mm and 60mm are 63mm and 29.4mm, respectively. In conclusion, according to the equation and the Specification, it is strongly required that the reinforced concrete structures with the cover depth under 100mm have to make a protection from combined deterioration factors by any methods like a surface coating, an increment of cover depth or an application of a special concrete.
A On-site Monitoring Device of Work-related Musculoskeletal Disorder Risk Based on 3D-Camera
Loh, Byoung Gook ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 110~116
DOI : 10.14346/JKOSOS.2015.30.6.110
A 3D camera-based on-site work-related musculoskeletal disorder risk assessment(WMDs) tool has been developed. The device consists of Kinect a 3D camera manufactured by Microsoft, a servo-motor, and a mobile robot. To complement inherent narrow field of view(FOV) of Kinect, Kinect is rotated according to PID servo-control algorithm by a servo-motor attached underneath, to track movement of a subject, producing skeleton-based motion data. With servo-control, full 360 degrees tracking of a test subject is possible by single Kinect. It was found from experimental tests that the proposed device can be successfully employed for on-site WMDs risk assessing tool.
Deficiency Monitoring Device
Loh, Byoung Gook ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 117~121
DOI : 10.14346/JKOSOS.2015.30.6.117
-deficiency related accidents occur every year and the most effective way to prevent them is to measure
concentration in air with a properly-calibrated
monitoring device before entering low-
areas. An electro-chemical sensor, Texas Instrument gas platform, and iPhone are used to construct a smartphone-based
monitoring device. The smartphone based
measuring approach offers advantages of small size, accessibility, internet-connectivity, and programmability in comparison to conventional
measuring devices. Multiple gas sensors can be conveniently interfaced to single smartphone, allowing for creating a network of gas sensors distributed across workplaces and remote monitoring via existing mobile communication network. To check proper function of the
monitoring device the sensor was exposed to shallow and deep human breaths. The readings decreased immediately after being exposed to exhalation and recovered during inhalation to a calibrated level of 20.9%. When readings decreased below a preset warning value of 19.5%, a low
warning was successfully activated on the smartphone.
Study on the Ways to Improve Deep Underground Road Facilities and Operation Based on the Cases of Longitudinal Tunnel
Choi, Jong Chul ; Lim, Joon Beom ; Hong, Ji yeon ; Lee, Sung Yeol ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 122~131
DOI : 10.14346/JKOSOS.2015.30.6.122
Recently, starting with the deep underground road construction plan in Seobu Expressway, Korea, there area many studies on deep underground roads to be newly built. However, there is an extreme lack of safety standards, which does not consider traffic conditions and road driving characteristics. Therefore, this study reviewed safety elements to reflect in the deep underground road planning by analyzing driving stability of longitudinal tunnels with road environments, which resemble deep underground roads. For comprehensive analysis, the characteristics and causes of the accidents that have occurred in seven longitudinal tunnels with a length of 2km or over in Gangwon area, were collected. Specifically, geometric structures and facilities of each tunnel were investigated. Also, the present state of facility installation and the changes in driving speed of vehicles passing through each tunnel were observed to analyze the causes for the traffic accidents in each tunnel and accident reduction alternatives. It was revealed that the most frequent accidents in the tunnels resulted from the changes of traffic flow due to the abrupt speed reduction of forward vehicles, or the failure in speed control of following vehicles during the traffic congestion situation. Moreover, installing facilities such as plane and longitudinal curves, median strips and marginal strips seem to induce consistent driving speed. These results mean that for accident prevention, speed management must be preceded and there is a need to develop and introduce safety facilities actively to control the driving flow of forward and following vehicles.
The Relative Effects of Feedback Frequency and Specificity of Eco-IVIS on Fuel Efficiency and Workload
Lee, Kyehoon ; Cho, Hangsoo ; Oah, Shezeen ; Moon, Kwangsu ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 132~138
DOI : 10.14346/JKOSOS.2015.30.6.132
This study examined the relative effects of feedback frequency and specificity of Eco-IVIS(eco in-vehicle information system) on the fuel-efficiency and workload. Eighty participants randomly assigned into four experimental groups (high frequency/specific, high frequency/global, low frequency/specific, and low frequency/global feedback) and they drove 16.4Km motorway under the each feedback condition. The dependent variable were fuel efficiency and Drive Activity Load Index which measured participants' subjective ratings of driving workload. The results showed that high frequent feedback was more effective for increasing fuel-efficiency than low frequent feedback, however, there was no significant difference of fuel-efficiency between specific and global feedback. Although, overall DALI score was comparable among four experimental conditions, visual demand score was significant higher under the high frequent feedback condition than low frequent feedback.
A Empirical Study on Influence of Safety on Elementary School Road Considering Commuting Distance & Mode Type
Kim, Tae Ho ; Kim, Seung Hyun ; Lee, Soo Il ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 139~147
DOI : 10.14346/JKOSOS.2015.30.6.139
This study deals with actual commuting distance and influence of risk factors depending on commuting distance and mode in order to reestablish actual commuting zone of primary school students. Data mining analysis(CHAID) was applied for this reestablishment using survey results from 6,927 primary school students in Seoul Metro. Six risk factors; convenience level of commuting path condition, convenience level of road crossing condition, vehicle speed on commuting path, segregation level between commuter and vehicle, congestion level of commuting path, and public security level and two mode; walking and cycle are considered in the analysis. As the results of CHAID analysis, commuting distance was divided into four zones; Internal Zone(0.491km under), External Zone(0.492 ~ 1.492km, 1.493 ~ 2.699km), Commutable Zone(2.70km over), and awareness level on safety is declined as commuting distance is increased. The risk factor affecting on safety is recognized differently by students depending on commuting distance and mode. For students commuting by walking, vehicle speed on commuting path and convenience level of commuting path condition are recognized as the prime risk factor within Internal Zone and Commutable Zone, respectively. For students commuting by cycle, convenience level of road crossing condition and vehicle speed on commuting path are recognized as the prime risk factor within Commutable Zone. Analysis results show that improved plan and program for commuting path for primary school students are required considering actual commuting distance and method.
A Study on the Effectiveness and Safety Comparison of Dispersants
Jin, Young-Min ; Lee, Joon-Hyuk ; Jo, Young-Hyuk ; Lee, Soon-Hong ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 148~155
DOI : 10.14346/JKOSOS.2015.30.6.148
Using dispersants is known to be an effective solution to accelerate the natural dispersion and being an appropriate oil spill response strategy. By breaking up large oil chunks into small droplets, dispersants are generally intended to help reducing further oil exposures and slicks. Collecting property data of circulating crude oil in South Korea and understanding the interaction between crude oils and dispersions need to be preceded for the effective dispersant use. This paper provides an property analysis of three selected oils which have the same composition of spilt oils from the Herbei Spirit Incident and conducts an emulsification and toxicity experiment with selected domestic and foreign dispersants. Results will present a direction of future domestic dispersants' development which aimed at eco-friendly and safety.
A Study on the Safety Improvement Methodology of Lifts using Chi-Square Statistics
Kwon, Soon-Keol ; Kim, Chang-Eun ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 156~163
DOI : 10.14346/JKOSOS.2015.30.6.156
The number of the lifts installed and used in Korea totals up to 526,676 units as of the end of December 2014, due to the development and urbanization of this country. Since the lift is one of the convenience facilities and especially a kind of essential transportation facilities used by a majority of passengers everyday, it is necessarily required to manage the lift safety. Therefore, this study aims to determine the 5 factors(kinds of lifts, ages of victims, causes of accidents, seasons in accidents, usages of buildings) affecting the types(caught in, trip over, falling, collision) and the injury levels(death, serious injury, minor injury) of the lift accidents based on the analysis of the total victims of 1,514 people due to the 1,146 accidents which have occurred for the past 15 years, and to find the frequency and ratio of each factor in the accidents, and to make a correlation among the factors. As the result of the analysis, it shows that there exists a statistically significant correlation among the factors.
Allocation of Safety Integrity Level for Railway Platform Screen Door System based on Consequence Severity and Risk Graph
Song, Ki Tae ; Lee, Sung Ill ;
Journal of the Korean Society of Safety , volume 30, issue 6, 2015, Pages 164~173
DOI : 10.14346/JKOSOS.2015.30.6.164
There exists required safety integrity level (SIL) to assure safety in accordance with international standards for every electrical / electronics / control equipment or systems with safety related functions. The SIL is allocated from lowest level (level 0) to highest level (level 4). In order to guarantee certain safety level that is internationally acceptable, application of methodology for SIL allocation and demonstration based on related international standards is required. However, application standard differs from every industry in domestic or international for application on mythology for allocation and demonstration of SIL. Application or assessment is not easy since absence on clear criteria or common definition. This research studied not only fundamental concept of SIL required to guarantee safety in accordance with international standards for safety related equipment and system, but different types of methodologies for SIL allocation. Specifically, SIL allocation for Platform Screen Door system of railway is studied applying methodology of severity of accidents and risk graph among different methodologies for SIL allocation.