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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 20, Issue 4 - Dec 2005
Volume 20, Issue 3 - Sep 2005
Volume 20, Issue 2 - Jun 2005
Volume 20, Issue 1 - Mar 2005
Selecting the target year
Failure of Ceramic Coatings Subjected to Thermal Cyclings
Han Ji-Won ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 1~5
An experimental study was conducted to develop an understanding of failure of ceramic coating when subjected to a thermal cycling. Number of cycles to failure were decreased as the coating thickness and the oxide of bond coat were increased. Using the finite element method, an analysis of stress distribution in ceramic coatings was performed. Radial compressive stress was increased in the top/bond coat interface with increasing coating thickness and oxide of bond coat.
A Study on Prediction of Railway Noise Using Raynoise Modeling - A comparison of predicting expressions and Raynoise simulations -
Kim Tae-Gu ; Park Min-Soo ; Kim Tae-Oh ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 6~10
With the rapid industrial development, railways have become a main traffic means of transportation. However, rail traffic noise and vibration have become a major problem in urban areas which is a very serious issue for the living environment. Especially, railway noise induced by rail operations has influenced on the residents living near railway tracks. The purpose of this paper is to investigate the Raynoise modeling in railway applications. Generally, my acoustics have been used to investigate the effectiveness of noise barriers in railway applications and barriers are modeled using the commercial software Raynoise. A-weighted sound pressure level have been measured at six locations, 4m from the track and are compared with experimental values. Based on the analysis of the results, Comparison between numerical and experimental values are within 1dB (A). Also, when a train is m through the Raynoise modeling, the general influential sphere of railway noise can be determined. Therefore, this study will be using basic data in establishing effective railway noise prevention plans far the future. Also, we could know that is applicable of Raynoise modeling at railway noise.
An Experimental Study on the Effect of Rotation Strength on Fire Whirl Characteristics
Choi Sang-Yeol ; Ryou Hong-Sun ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 11~17
Rotational motion in the atmosphere around a fire may have a profound influence on the fire plume. This process underlies the occurrence of fire whirls. Fire whirls are rare but highly destructive phenomenon which were observed in a large forest, urban and building fires. The present study aims to investigate of the effect of rotation Strength on the fire whirl characteristics expeimentally. Experiments are performed for various sizes of fire source with different rotation strength. From the experimental observations, it is noted that the mean centerline temperature is gradually increased and mean radial temperature is decreased as increases rotation strength. The characteristic mean flame height of fire based on the visible observation is increased as increases of dimensionless swirl parameter,
, represented by swirl induced motion to buoyancy driven motion.
Effect of Bend Angle on the Behavior of pipe Bend under Internal Pressure and In-Plane Bending toads
Kim Jin-Weon ; Na Man-Gyun ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 18~25
This study performed finite element analysis on the pipe bend with various bend angles under loading conditions of internal pressure and combined pressure and bending, to investigate the effect of bend angle on the collapse behavior of pipe bend and on the stress state in the bend region. In the analysis, the pipe bends with bend angle of
were considered, and the bending moment was applied as in-plane closing and opening modes. From the results of analysis, it was found that the collapse moment of pipe bend increases with decreasing bend angle. As the bend angle decreases, also, the equivalent stress at intrados region increases regardless of bending mode. Under closing mode bending especially, the increase in stress at intrados is significant so that the maximum stress region moves from crown to intrados with decreasing bend angle.
Elastic-Plastic Stress Distributions Behavior in the Interface of SiC/Ti-15-3 MMC under Transverse Loading(II)
Kang Ji-Woong ; Kwon Oh-Heon ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 26~31
The strong continuous fiber reinforced metal matrix composites (MMCs) are recently used in aerospace and transportation applications as an advanced material due to its high strength and light weight. Unidirectional fiber-metal matrix composites have superior mechanical properties along the longitudinal direction. However, the applicability of continuous fiber reinforced MMCs is somewhat limited due to their relatively poor transverse properties. Therefore, the transverse properties of MMCs are significantly influenced by the properties of the fiber/matrix interface. In order to be able to utilize these MMCs effectively and with safety, it must be determined their elastic plastic behaviors at the interface. In this study, the interfacial stress states of transversely loaded unidirectional fiber reinforced metal matrix composites investigated by using elastic-plastic finite element analysis. Different fiber volume fractions
were studied numerically. The interlace was treated as three thin layer (with different properties) with a finite thickness between the fiber and the matrix. The fiber is modeled as transversely isotropic linear-elastic, and the matrix as isotropic elastic-plastic material. Using proposed model, the effects of the interface region and fiber arrangement in MMCs on the distributions of stress and strain are evaluated. The stress distributions of a thin multi layer interface have much less changes compared with conventional perfect interface. The analyses were based on a two-dimensional generalized plane strain model of a cross-section of an unidirectional composite by the ANSYS finite element analysis code.
A Sensitivity Study of a Steam Generator Tube Rupture for the SMART-P
Kim Hee-Kyung ; Chung Young-Jong ; Yang Soo-Hyung ; Kim Hee-Cheol ; Zee Sung Quun ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 32~37
The purpose of this study is for the sensitivity study f9r a Steam Generator Tube Rupture (SGTR) of the System-integrated Modular Advanced ReacTor for a Pilot (SMART-P) plant. The thermal hydraulic analysis of a SGIR for the Limiting Conditions for Operation (LCO) is performed using TASS/SMR code. The TASS/SMR code can calculate the core power, pressure, flow, temperature and other values of the primary and secondary system for the various initiating conditions. The major concern of this sensitivity study is not the minimum Critical Heat Flux Ratio(CHFR) but the maximum leakage amount from the primary to secondary sides at the steam generator. Therefore the break area causing the maximum accumulated break flow is researched for this reason. In the case of a SGIR for the SMART-p, the total integrated break flow is 11,740kg in the worst case scenario, the minimum CHFR is maintained at Over 1.3 and the hottest fuel rod temperature is below 606"I during the transient. It means that the integrity of the fuel rod is guaranteed. The reactor coolant system and the secondary system pressures are maintained below 18.7MPa, which is system design pressure.
Experimental and Analytical Study on the Burst Pressure of Steam Generator Tubes with T-type Combination Cracks
Shin, Kyu-In ; Park, Jai-Hak ; Yoon, Kee-Bong ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 38~43
Several nuclear power plants reported that they often found the combination cracks, which consist of longitudinal and circumferential cracks in the tubes. For the burst pressure of a tube with a single longitudinal or circumferential crack several experimental equations have been proposed in published literatures. But for the combination crack appropriate fracture criterion has not been proposed yet. In this study the burst pressures of a tube with a longitudinal crack or a T-type combination crack consisting of longitudinal and circumferential cracks were obtained experimentally and analytically. Fracture parameters such as crack opening angle (COA) were investigated by using elastic plastic analysis. Also the burst pressure far a T-type combination crack located near a tubesheet was considered to develop a length-based criterion. Because most of the axial, circumferential or combination cracks initiate in roll transition zone near the tubesheet.
Experiment on the Characteristics of Surface Flame Propagating Velocity of Oil filled Cable in the Underground Utility
Lee Jae-Ha ; Jeong Jin-Yong ; Hong Gi-Bae ; Ryou Hong-Sun ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 44~49
Real-scale experimental study was performed to characterize the surface flame propagating velocity along the OF cable in the underground utility fire. Temperatures of oil filled OF cable and dried OF cable with the diameter of 90mn were measured using thermocouple and data log system. The hexane and alkyl-benzene oil were used as a fire source using the ignition device. As a result while the surface flame propagating velocity of the three cables was
, the surface flame propagating velocity of the one cable was
. Therefore, it was found that the surface propagating flame velocity of the three OF cables is
faster than that of one OF cable case. The results show that the surface propagating flame velocity became larger as increase of the number of cable, the volume of alkyl-benzene oil in the cable. The characteristics of surface propagating flame velocity in the OF cable can be helpful to fire suppression system in utility
Assessment of Fuzzy Measure Possibility for the Electromagnetic Field according to Voltage fluctuation of the Jechon Area
Kim, Sang-Chul ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 50~55
This Paper Presents assessment of fuzzy measure Possibility far the electromagnetic field according to voltage fluctuation of the Jechon Area. To cope with substantial electromagnetic analysis, the safety assessment were analyzed the double 154kV T/L, 345kV T/L, Jechon-Ichon Jechon-Youngju, respectively. As the results of case study, in case of 345kV T/L, the electric field value was 11.4927kV/m, magnetic field value was 0.4622G at the Point about 7m away from the line in severest case. Tn assessment of fuzzy measure Possibility for the electromagnetic field, this paper use probability of fuzzy and measure of fuzziness technique.
A Study on the Fire Properties of MOF Insulation Cover and Field Condition of 22.9kV Class Power Receiving System
Choi Chung-Seog ; Kim Dong-Woo ; Han Woon-Ki ; Lee Ki-Yeon ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 56~60
We studied fire properties of MOF(Metering Out Fit) insulation cover and field condition of 22.9kV power receiving system.
of formal equipments were installed indoors, whereas
of informal equipments were installed as H-type. Insulation treatment was not done at a
ratio of main line(
of MOF). Fire pattern analysis showed that the fire started at the secondary part of OC wire. In the result of DTA(Differential Thermal Analysis), normal cover showed exothermic reactions at
(endothermic reactions at
). Whereas damaged cover showed exothermic reactions at
(endothermic reactions at
). In the result of TGA(Thermo Gravimetric Analysis), the thermal weight change of normal cover was similar compared to damaged cover. In the result of FT-IR analysis, normal cover showed absorption peaks at
. Whereas, in case of tracked cover, the absorption peaks that were shown in normal cover disappeared and different absorption peak was shown at
Human Reliability Assessment for a Installation Task of Temporary Power Cables in Construction Fields
Kim Doo-Hyun ; Lee Jong-Ho ; Kim Sang-Chul ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 61~66
This paper presents an human reliability assessment(HRA) for a installation task of the temporary power cable in construction fields. HRA is evolved to ensure that the workers could reliably perform critical tasks such as a process of the temporary power cable. Human errors are extremely commonplace, with almost everyone committing at least some errors every day. The considerable parts of electric shock accidents in the construction field are caused by a series of human errors. Therefore it is required to analyze the human errors contained in the task causing electric shock event, the event tree analysis(ETA) is adopted in this paper, and particularly human reliability was estimated for a installation task of the temporary power cables. It was assumed that the error probabilities of the human actions may be obtained using the technique for human error rate prediction(THERP). The results show that the predominant task on reliability in the cable installation tasks is check-out tasks and the probability causing electric shock by human errors was calculated as
Infuences of Harmonic Current on Electrical Characteristics of an Induction Motor
Park Yang-Birm ; Kim Doo-Hyun ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 67~72
This paper proposes the influences of harmonic current on electrical characteristics of an induction motor. Recently, a power system gets more worse as nonlinear load makes harmonics to affect energy lose of system and shorten lift of machines. In this paper, the electrical effect and THD(Total Harmonic Distortion) of harmonic current to an induction motor which is of great use in the industrial fields are measured and analyzed. A power conversion equipment(inverter) is installed to produce harmonics and variable reactors are installed to reduce the harmonics having an effect on the input terminal. Then the effects of the reactors are measured and analyzed. Also average voltage, current, power and 110 by harmonics are analyzed. The results show that Inn is increased by increasing load of the induction motor and installing reactors. And the harmonics affecting the input terminal are decreased by increasing reactor 3[mH] to 6[mH], however, average power of the induction motor is decreased. Therefore, it is very important that reactors should be carefully installed considering the merits and demerits resulting from the installation of reactors.
An Experimental Study on the Psycho-acoustic Response to Alarming Sound in a Fire
Song Hyuk ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 73~78
A fire is occurring increasingly every you and the damage is bigger in proportion to the number. Therefore a fire is classified as a serious calamity. It is important to evacuate and fight a fire by early Perception. However, if the alarming sound is not perceived when a fire breaks out the damage could be expanded. From this point of view, this study aims to analyse the correlation between alarming sound sources and sound quality parameters through psycho-acoustic experiment using Korean vocabularies extracted by existing study. The sound sources more dangerous, tense and urgent were chosen. The results from this study are as follows: 1. airraid, klaxon2 and S.O.S got a point more than conventional alarming sound.2. correlation coefficient between Loudness(L) and Unbiased Annoyance(UA) was highest with 0.63 md Sharpness(S) and Roughness(R) was -0.40 and Fluctuation Strength(FL) and Tonality(T).
Investigation of the Structural Modeling of Transfer Floor in Column-Supported Wall Structure
Kim Young-Chan ; Lee Jae-Jun ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 79~83
Recently, column-supported wall structural system is frequently adopted in mixed-use high-rise buildings. Due to the sudden change of stiffness at the transfer floor proper load transfer and avoiding stress concentration are very important in column-supported wall structural system. It is revealed by many investigators that 2-dimensional analysis is not reliable and inappropriate selection of element for modeling may lead to erroneous result for gravitational loading. In this study, structural behavior of column-supported wall structure at transfer floor subject to lateral loading is compared by changing modeling methods.
Experimental Study on the Strength of Concrete Specimens Mixed with Tire Chips
Son, Ki-Sang ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 84~90
This study is to use results of the experiment on the influence to the strength by mixing powders of wasted tires into regular remicon within a range of little effectiveness in durability, applicability, economic aspect, and workability, to put it to practical use and to apply as basic data from a view of recycling wasted tires as construction materials. And the concrete, which was mixed with 10mm particles with ratio of
respectively at 270 of mixing strength, was reduced by
in compressive strength compared to normal concrete, whereas concrete mixed with other than 10mm particles showed lower decrease ratio compared to the former by reducing only
. it is found that as strength increases, the less in quantity of aggregate and the more increase in quantity of cement. When considered to the above result, it is estimated that concrete mixed with wasted tire particles could be better used in conditions of compressive force rather than tensile force, and could also be used for structures with flexural strengths as well. In conclusion, higher strengths could be made using waste tire mix.
A Study on the Influence of Climate Factors on Construction Accidents
Son Chang-Baek ; Kim Sang-Chul ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 91~97
The purpose of this study is to provide basic data for establishment of prevention counterplan against construction accidents in preparation for variation of climate conditions. In order to execution of this study, it was analyzed relations of climate factors and cases of construction accident occurred construction sites. In occurrence of construction accidents inducing death upon variation of Climate factors, precipitation and wind velocity were not related directly to construction accidents inducing death. On the other hand, the more temperature and humidity are high, the more construction accidents inducing death occurred. Especially, when temperature and humidity are above
respectively, field managers must pay attention to safety management of construction sites.
Insulation Characteristic of Waste Sawdust-mixing Concrete
Hong, Seung-Ryul ; Cho, Byung-Hun ; Son, Ki-Sang ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 98~104
Saw dust concrete f3r finding out insulation characteristic was tested using test plate
. basically, molds f3r the test of compressive, tensile, normal without sawdust,
, mixing proportion. heat conductivity of the saw dust concrete mixed with the above proportion was taken in this study. Thermal conduction of normal concrete depends on mixing proportion strength aggregate character, water content. all these items are specified here in fables.
saw-dust mising concrete shows as the faction as normal insulation material has its function. and the higher saw-dust mixing rate becomes, the thermal conduction becomes the less Then, the conclusions are that saw-dust using concrete has better insulation function than normal concrete.
An Adiabatic Characteristic on the Waste tyre Powders Mortar-Containing
Choi, Jae-Nam ; Son, Ki-Sang ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 105~112
This is to find out that cement mortar mixed with waste tie particle can be applied for recycling it and enhanced to have shock absorption capacity. Therefore, architectural material specification and its related references for the disposal of it are based on for the study. Test has been performed with procedure, based on the Korea Standard insulation mortar and Compressive Strength Test has been done at K remicon factory approved by Korea Government in Korea, in order to decrease any possible error in mixing procedure. Test molds far insulation capacity and cohesive strength have been delivered to the expert agency for having more exact results. The result from the above test shows that waste tyre mixed with cement mortar has almost equal to the common concrete. This means that the recycling of the waste t)re will be demanded more and more in case of having continued development for this recycling area. And also waste t)to-using construction material can be more applied for construction area than existing material. Thus, this recycling method can be very usefully applied for solving environmental problem and for establishing economic aspect.
A Study on the Service Life Prediction of Reinforced Concrete Structures with Chloride Penetration
Kim Dong-Baek ; Kwon Ki-Jun ; Park Byung-Wook ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 113~118
Recently, the corrosion of reinforced concrete structures has received great attention related with the deterioration of sea-side structures, such as new airport, bridges, and nuclear power plants. In this regards, many studies have been done on the chloride attack in concrete structures. The purpose of the present study is to explore the influences of chloride attack parameters to service life of reinforced concrete structures and to propose the rational program for the guarantee of service life. for this purpose, several codes for durability design have been examined and the diffusion analysis based on Fick's second law has been performed with various parameter value. The present study indicates that durability design code of Japan Society of Civil Engineers is more rational than other codes but the application of durability design code of JSCE to domestic durability design needs more studies to the various parameter values related with chloride penetration.
Damage Identification Technique for Bridges Using Static and Dynamic Response
Park Woo-Jin ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 119~126
Load bearing structural members in a wide variety of applications accumulate damage over their service life. From a standpoint of both safety and performance, it is desirable to monitor the occurrence, location, and extent of such damage. Structures require complicated element models with a number of degrees of freedom in structural analysis. During experiment much effort and cost is needed for measuring structural parameters. The sparseness and errors of measured data have to be considered during the parameter estimation Of Structures. In this paper we introduces damage identification algorithm by a system identification(S.I) using static and dynamic response. To study the behaviour of the estimators in noisy environment Using Monte Carlo simulation and a data measured perturbation scheme is adopted to investigate the influence of measurement errors on identification results. The assessment result by static and dynamic response were compared, and the efficiency and applicabilities of the proposed algorithm are demonstrated through simulated static and dynamic responses of a truss bridge. The assessment results by each method were compared and we could observe that the 5.1 method is superior to the other conventional methods.
Comparison of Posture Classification Schemes of OWAS, RULA and REBA
Kee, Do-Hyung ; Park, Kee-Hyun ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 127~132
The purpose of this study is to compare representative posture classification schemes of OWAS, RULA and REBA in terms of correctness for postural load. The comparison was based on the evaluation results by the three methods for 224 working postures sampled from steel, electronics, automotive, and chemical industries. The results showed that OWAS and REBA generally underestimated postural stress than RULA irrespective of industry type, work performed and whether or not leg posture is balanced. While about
of the 224 posture were evaluated with the action category/level 1 or 2 by OWAS and REBA respectively, about
of the postures were classified into the action level of 3 or 4 by RULA. The coincidence rate of postural stress category between OWAS and RULA was just
, while the rate between RULA and REBA was
. It is concluded from the findings of this study and the previous research that compared to OWAS and REBA, RULA more precisely evaluates postural stress.
A Study on the Remedy for Promotion of Work Ability
Park Hai Chun ; Kim Jong Rae ; Kim Hyun Woo ; Kim Shin Hun ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 133~139
TWe investigated whether work ability index(WAI) was highly correlated with work environment(physical work environment, working condition and work form) correlated high. The study population consisted of technicians from one manufacturing company in South Korea(n=104). WAI and work environment were analyzed by correlation and multiple regression. Therefore, we conclude that the correlation of WAI and work environment in this population was high. So if there are the older employees having a poor score on the items related to work environment, we can elevate the work ability by dealing with work environment. Moreover, we can make the best program to maintain and raise WAI in short term.
Analysis on the Case of PL Accident in the Area of Industrial Safety
Hong Han-Kuk ; Kang Byung-Young ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 140~145
The PL(Product Liability) Law has been going into effect in Korea since July 2002. Accordingly, a company's responsibility for customers who are damaged by the defect in the product safety has been gradually strict and imposed burden on management. Not only general consumers but also labors who work with machine in the field of production are included in the concept of victim of the PL Law. That is to say, when a worker is damaged by the defect of machine he can institute a PL lawsuit more aggressively, not just get the industrial accident compensation as usual, only if not his own fault but the defect of machine used in the course of production can be demonstrated. This paper intends to present suggestions to PL prevention of manufacturing companies of industrial machine through the case research of PL accidents in the area of industrial safety.
A Study on Introduction Plan of the Private Security Guard System
Kim Twe-Hwan ; Park Dae-Woo ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 146~150
According to the current record of Private Security in Korea, more than 110,231 private security guards and around 2,213 security guard associations are engaged in the private security industries. However, there is no a professional license for the private security. In order to be provided a high quality service from private security industries, the security guard should be required his/her professional qualification which can be upgraded by establishing a professional license system. For introducing the license system the government and security guard associations need to support the suitable training program including curriculum and method, and all associations related to the private security have to require people involved in any kinds of private security matters to complete obligatorily some educational training programs. And also, to complete a college should be the minimum requirement.
The Protection in Security Situation and Effective Ways in the International Major Meetings
Kwon Jeong-Hun ; Lee Sae-Hwan ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 151~157
One of the most significant parts in the international major meetings is to stand attendants over various danger and keep the safe of the nation. The International major meetings such as the summit, the athletic meeting are often held around the world while the activity of the terrorists unseen increases at the high speed. The goal of this thesis is to present some effective ways for successful opening of the international event. Some of the proposals that I come up with the research can be summarized as follows: the smooth cooperation between countries, the control for NGO's demonstration, the training and the best use of security personnel, finally the understanding of peoples and forming sympathy from them.
A Study on the Development of Overflow Cutoff Valve for Liquefied Petroleum Gas Cylinders
Rhim Jong-Kuk ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 158~161
This research is about overflow cutoff valve for liquefied petroleum gas cylinders. This valve was developed based on Bernoulli's equation and Newton's equation. The structure of overflow cutoff valve was made by insert module instead of the ordinary valve that is used at present. Recently, the increase in use of gas for fuel in houses has resulted to more frequent occurrences of gas related accidents. In Korea, the government has made a law for the obligatory use of the cutoff valves. This cutoff valve is not ya developed. This research focuses on the use of over flow cutoff valve for LPG cylinders. If this valve is adapted, many accidents can be prevented.
Measurement and Prediction of the Lower flash Point for n-Propanol+n-Decane System Using the Tag Open-Cup Apparatus
Ha Dong-Myeong ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 162~168
The lower flash points for the n-propanol+n-decane flammable mixture were measured by the Tag open-cup apparatus(ASTM D 1310). The experimental results of mixture exhibited the lower flash point than those of pure component in the flash point versus composition curve. The experimental value of the minimum flash point is
at a mole fraction of n-propanol of 0.71, and the flash point of n-propanol was
. The experimentally obtained data were compared with the values that had been calculated by use of the prediction model, which assumes an ideal solution, and the flash point prediction models based on the van Laar equation were used to estimate the activity coefficients. The predictive curve based on an ideal solution deviated from the experimental data for this system. The experimental results demonstrate a close agreement with the predicted curves, which used the van Laar equation. The average absolute deviation(A.A.D.) from using the van Lau equation is
. The methodology proposed here in this paper can thus be applied to incorporate an inherently safer design for chemical processes, such as determining safe storage and handling conditions for flammable solutions.
Ergonomic Evaluation of a Forearm Supporter for a Mouse
Bae Dong Cheol ; Chang Seong Rok ; Jung Jae Hoon ; Jin Sang Eun ;
Journal of the Korean Society of Safety , volume 20, issue 2, 2005, Pages 169~174
Traditionally, keyboards have been one of the most frequently used input devices for information processing using computers. As most computers adopt the Microsoft Windows for their operating system however, the usage of mouse has recently increased to a great extent. Moreover, the mouse has been used as the leading input device in such areas as industrial design and computer aided design. Excessive uses of mouse may cause a severe pain and fatigue on neck and upper limb due to the intensive and repetitive use of corresponding muscles, which renders a decline in efficiency and leads to musculoskeletal disorders. The main purpose of this study is to find the best working conditions to prevent musculoskeletal disorders when using mouse in a neutral posture. Utilizing electromyogram amplitude and Borg's scale, the role change and strength imposed on the muscles were measured and analyzed with and without the forearm support concerned. Also investigated were the effects of changes in elbow forearm supporter.