Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korea Safety Management and Science
Journal Basic Information
Journal DOI :
Korea Safety Management and Science
Editor in Chief :
Volume & Issues
Volume 16, Issue 4 - Dec 2014
Volume 16, Issue 3 - Sep 2014
Volume 16, Issue 2 - Jun 2014
Volume 16, Issue 1 - Mar 2014
Selecting the target year
An Empirical Study on method to Reduce of Human Error of High-Speed Train Drivers
Joo, Chang Hoon ; Kim, Tae Gil ; Lim, Jeong Oun ; Kang, Kyung Sik ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 1~9
DOI : 10.12812/ksms.2014.16.2.1
This study tried to propose plan to prevent human error of railroad driver among human error of railroad worker which takes great share in railroad accident. For this, in order to maintain correlation between the accident actually occurred after the opening of high-speed railroad and experience of accident that did not happened, survey on respondent was analyzed by conducting survey on KTX captain who is working in driving work of high-speed railroad, and instruction management team manager who manages KTX captain and captain. This thesis classified the factors by human factor, job factor, environment factor, organization factor, and established human error management model by comparing and analyzing how each factors have spatial interrelations with a railroad accident. The purpose of this study is to contribute to make safe railroad, and reliable railroad by preventing human error accident by minimizing human error of high-speed railroad drivers, and improving driving workers to cope accurately and fast with irregularities through various institutional improvement, improvement of driving facilities, improvement of operating room environment, and improvement of education system.
A Study on the establishment of effective Railway Safety Management System focused on KORAIL`s SMS
Kim, Tae-Gil ; Joo, Chang-Hoon ; Hwang, Dong-Hwan ; Choi, Seog-Jung ; Kang, Kyung-Sik ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 11~18
DOI : 10.12812/ksms.2014.16.2.11
Advanced Safety Management System(SMS) of Korea Railroad Corporation for risk management should be established applying contents-centered domestic standard according to Railway Safety Act and process-centered international standards suggested by Lloyd`s Register Company. Besides, laws, regulations, guidelines and manuals which are optimized for each sector should be systematically integrated to strengthen the consistency of SMS of KORAIL. New safety regulations and guidelines for safety management/train operations/maintenance should be established according to the safety policy of KORAIL to boost effective field work by regulations, guidelines, manuals, etc. The advanced Safety Management System will lead KORAIL as a competent global enterprise with its boosted reputation in the international railway market.
The Effect of Frequent Change in Railway Driving Regulations on Human Error
Kim, Jin-Tae ; Shin, Tack-Hyun ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 19~29
DOI : 10.12812/ksms.2014.16.2.19
Korean societal concern for the train accidents is fast and widely increasing with an ever-increasing demand and use for KTX. Most of these train accidents are inclined to be caused by human error. Experts used to attribute the causes of human error to the defects in various aspects such as technology, organizational system, practices, corporate culture, and/or human resource itself. Among the diverse causes of human error, an important one, even though it was rarely focused, may be the issue of impact of rule or procedure change on human error. Giving attention to the implicit importance of this issue, this study intends to highlight the theme of frequent procedure change in railway driving manual as a critical factor of human error. To attain this purpose mentioned above, dual methodologies were adopted. One is to qualitatively analyze the real cases of procedure change in relevant manuals followed by the incident case(passing the station scheduled to stop) happened lately. Another is to quantitatively perform statistical analysis based on questionnaires received from 224 train drivers. Results show that frequent changes in internal affairs procedure is or may be an important factor causing stress and human error from train drivers.
On Improving the Test and Evaluation Process by Incorporating the RAMS and Risk Management Processes
Shin, Young-Don ; Sim, Sang-Hyun ; Lee, Jae-Chon ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 31~42
DOI : 10.12812/ksms.2014.16.2.31
As weapon systems become complex in terms of the scale and functionality, the required time to complete the test and evaluation (T&E) process is inevitably getting longer. However, nowadays the reduction of T&E period becomes one of the core targets in the weapon systems acquisition programs. This is because the reduced time for T&E process can yield the reduction of defense budget and also faster deployment of the weapon systems, thereby having a competitive edge over rival countries. On the other hand, in weapon systems development the management of reliability, availability, maintainability and safety (RAMS), and risk is considered important to keep competitiveness and thus has been carried out separately. Thus, the objective of this paper is to study on improving the T&E process by integrating the RAMS and risk management process in it. To do so, the related processes are analyzed and modeled first. Then an integrated process model is developed. The resulting model is equipped with the traceability among the data and interfaces that are generated from the T&E and RAMS/risk processes. As a case study, the model developed is applied in tanks development. The effective use of the traceability is expected to reduce the time and cost required to complete T&E process.
Model-Based Architecture Design of the Range Safety Process for Live Fire Test with Enhanced Safety
Ye, Sung Hyuck ; Lee, Jae-Chon ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 43~52
DOI : 10.12812/ksms.2014.16.2.43
In weapon systems development, live fire tests have been frequently adopted to evaluate the performance of the systems under development. Therefore, it is necessary to ensure safety in the test ranges where the live fire tests can cause serious hazards. During the tests, a special care must be taken to protect the test and evaluation (T&E) personnel and also test assets from potential danger and hazards. Thus, the development and management of the range safety process is quite important in the tests of guided missiles and artillery considering the explosive power of the destruction. Note also that with a newly evolving era of weapon systems such as laser, EMP and non-lethal weapons, the test procedure for such systems is very complex. Therefore, keeping the safety level in the test ranges is getting more difficult due to the increased unpredictability for unknown hazards. The objective of this paper is to study on how to enhance the safety in the test ranges. To do so, an approach is proposed based on model-based systems engineering (MBSE). Specifically, a functional architecture is derived utilizing the MBSE method for the design of the range safety process under the condition that the derived architecture must satisfy both the complex test situation and the safety requirements. The architecture developed in the paper has also been investigated by simulation using a computer-aided systems engineering tool. The systematic application of this study in weapon live tests is expected to reduce unexpected hazards and test design time. Our approach is intended to be a trial to get closer to the recent theme in T&E community, "Testing at the speed of stakeholder`s need and rapid requirement for rapid acquisition."
Effect of the Application of Safety Patrol Management System(SPMS) upon the Reduction of Disaster & Accident Occurrences in Construction Site
Yoon, Yeo-Chan ; Chung, Kwang-Seop ; Kim, Young-Il ; Kim, Gyeong-Ho ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 53~61
DOI : 10.12812/ksms.2014.16.2.53
The disaster and safety accidents in any construction site occur inevitably. Since the on-site disaster and accident occurrence became one of major concerning factors in construction site, architects & building executers have been flooded with safety management advices. The purpose of this paper is to survey and analyze the effect of the application of Safety Patrol Management System(SPMS) upon the reduction of disaster & accident occurrences in construction site. In order to estimate and reduce the disaster and accident ratio in construction site, various surveyed data has been analysed. It will establish the suitable design standards and suggest the basic database for estimating disaster and accident ratio.
A Study on the Accident Analysis by Nip Points and Risk Assessment in the Medium and Small Enterprise
Yang, Kwang Mo ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 63~70
DOI : 10.12812/ksms.2014.16.2.63
As preventive measures have received tremendous attention to prevent any possible accident in advance, many work places have introduced safety and health management systems. However despite of this government`s effort, the industrial accident rate of small-scale businesses with less than 50 employees does not decline, which is mainly because the projects are not differentiated according to the risk level of individual business. To evaluate the risk level of small-scale businesses with less than 50 employees and then establish effective safety and health management systems according to the risk level, this study has conducted the following processes. The small-scale businesses with less than 50 employees were evaluated through accident type, and potential accident risk factor was evaluated through location, business type, and business size. The results of this analysis are expected to make contribution to improving the effectiveness of the safety and health management supports to small-scale businesses with less than 50 employees.
The path analysis of the influence of occupational safety and health activities via worker`s participation
Rhee, Kyung Yong ; Cho, Hum Hak ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 71~80
DOI : 10.12812/ksms.2014.16.2.71
The occupational injury and illness(OII) was influenced by the various factors. This study was planned to investigate the pathway of the activities of OSHM on the rate of OII via worker`s participation. The survey on the trend of the activities of OSHM was used. The sample size of manufacturing industry was 3,000 enterprises and that of construction was 1,000 enterprises. The survey was done by interview method with structure questionnaire. Questions about the activities of OHSM were integrated into one category using factor analysis. The enterprises with OII has more activities of OSHM than that without OII. Among enterprises with OII, the level of the activities of OSHM was positively correlated with the rate of OII. The activities of OSHM has influenced on the rate of OII directly and indirectly via worker`s participation and the activities of prevention of accident. Worker`s participation also has the direct effect and indirect effect on the rate of OII. Worker`s participation in construction sector has more effect on OII than that in manufacturing sector.
Analysis of health inequality by the type of employment on health among employees - Pathway of the effect via the exposure of hazardous factors -
Rhee, Kyung Yong ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 81~90
DOI : 10.12812/ksms.2014.16.2.81
Flexible production system has been expanded to all sectors of economy with the change of labor market and diversification of employment. The unstable employment with irregular work has replaced stable employment with regular work. This study has investigate the impact pathway of the type of employment on health status especially ill-health symptoms experiences. Among the first Korean Working Conditions Survey data, the employee`s response data was used to analyze the path way with multiple regression analysis. The result has shown the direct effect of the type of employment on ill-health symptoms experience. Indirect effect of the type of employment was found the pathway via the exposure to noise, high temperature, low temperature, dust, skin contact to chemicals, painful posture, heavy material handling, standing position, repetitive movement of hands. However the exposure to the other hazardous factors such as organic solvent, wholebody vibration, radiation, lifting people, infectious materials were not influenced by the type of employment.
The relationship between perceived safety climate and safety participation, and the mediating effect of safety motivation in small business employee
Ahn, Kwan Young ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 91~99
DOI : 10.12812/ksms.2014.16.2.91
This paper reviewed the relationship between safety climate(management commitment, safety education, preventive activity) and safety participation, and the mediating effect of safety motivation(intrinsic and extrinsic motivation) in small business employee. Based on the responses from 270 employees, the results of multiple regression analysis appeared as follow; 1) management commitment, safety education, and preventive activity effect positively on intrinsic/extrinsic safety motivation. 2) management commitment, safety education, and preventive activity effect positively on safety participation. 3) intrinsic and extrinsic safety motivation effect positively on safety participation. 4) intrinsic safety motivation mediates between 3 climate factors(management commitment, safety education, preventive activity) and safety participation. 5) extrinsic safety motivation mediates between only management commitment and safety participation.
Study on Experience and Practice of Safety Education
Kim, In-Jung ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 101~109
DOI : 10.12812/ksms.2014.16.2.101
This study is about safety education experience and practice of parents who are raising preschool children and the study results are as the following. For safety education experience state, parents had experience of safety education and mostly received it through communities, TV, Internet, etc. The most common educational content was the traffic safety education. For safety education practice degree according to number of children, safety education practice was mostly done well with 1~2 children. For safety education practice degree according to family type, safety education practice degree within the family was done most in nuclear families while healthy life habit safety education practice degree was done most in nuclear families and reconstituted families. Also, for traffic safety education practice degree, it was done well in nuclear families. For respiratory disease safety education practice degree, nuclear families and reconstituted families were the highest and for first aid safety education practice degree, single-parent families were the highest. For safety knowledge level of parents, safety knowledge of family was the highest, followed by safety knowledge of respiratory disease, and traffic. For safety education practice degree and safety knowledge according to safety education experience of parents, there was a significant difference in practice degree according to safety education experience of parents and there was also difference in practice knowledge according to experience. There was also education effect in healthy life habit safety knowledge and traffic safety knowledge.
Feasibility study for the self powered wireless emergency call button using electromagnetic energy harvesting mechanism
Kim, Il-Jung ; Choi, Yeon-Suk ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 111~119
DOI : 10.12812/ksms.2014.16.2.111
This paper describes the design and implementation of a electromagnetic energy harvesting mechanism and electronic circuit for autonomous emergency call system. This analysis results show the power output of the proposed harvesting mechanism and circuit up to max power output 5V and it can hold up to 65 msec of the power generation and 10msec of the RF transmission. Based on the these testing results, the implementation of autonomous emergency call device without battery power or any external power source is feasible.
The impact of green practices on firm`s performance
Kim, Seonmin ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 121~129
DOI : 10.12812/ksms.2014.16.2.121
The purpose of this paper is to evaluate the impact of green practice on firm`s performances. It focuses on the performance of the firm that already accredited as an excellent green practice firm by the Corporate Governance Service. The regression analysis method was chosen to measure firm performance. This paper also investigate how the performance of green practice are related to some factors such as levels of accredition, R&D cost, and R&D capitalization. This result will give an insight of constructive directions for increasing of firm performance.
A simulation for stock level considering client delivery due date in auto part industry
kim, Joonghoi ; Kim, Young-Chun ; Kang, Kyung Sik ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 131~138
DOI : 10.12812/ksms.2014.16.2.131
Auto part industry supplies production for auto manufacturer and after market. These company have inventory for delivery. High inventory level can be good for delivery, but cost will be increase. Low inventory level can be customer unsatisfaction for delivery late. Low inventory level also is reason of low productivity by decreasing product batch size. These article suggest model for calculation a proper inventory level and prove a effect by simulation of some company.
A Study on the Development of Integrated Logistics System for Hospital Logistics Cooperation
Park, Jong Suk ; Kim, Han Sung ; Lee, Jae Gun ; Choi, Hoon Young ; Kang, Kyung Sik ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 139~146
DOI : 10.12812/ksms.2014.16.2.139
In Korea`s distribution and production field establishment of logistics information system and automation of logistics were greatly developed. But there is no characteristic and professionalism about hospital logistics, and distribution center is located in outside warehouse, logistics system is very important. Since hospital has human power to receive product, system is not as much required, but outside warehouse requires system for arrival from medicine and medical supplies wholesale dealer and vender, warehousing, storage, and automation facilities, and system for various works such as peaking instruction, classification, packing, cargo-working, delivery, order of medicine from hospital and non-medicine in hospital is essential. Therefore, This study is about development of automatic identification of slide which cannot be overlooked in efficiency of hospital logistics, establishment of database, and information interlocking between automatic storage system and outside warehouse.
A WMS Model Interfacing with Material Warehouse in Real Time in Puting Materials to Manufacturing Processes - in Automobile Parts Manufacturing Industry -
Kong, Myung-Dal ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 147~155
DOI : 10.12812/ksms.2014.16.2.147
This paper suggests a specific model that could efficiently improve the interaction and the interface between WMS(Warehouse Management System) terminal and PDA terminal through real time processing in manufacturing shop. The proposed model shows that the new method can more efficiently perform to reduce processing time for shipping and receiving, compared with the current approach. As a result of the certain test among the main server, WMS system, and PDA terminal, it is noted in case of the new proposed system that the effects of proposed model are as follows: (a) While the receiving lead time for carrying by the current method was 2 hours, the receiving lead time by the new method was 20 minutes. (b) While the shipping lead time for carrying by the current method was 1 hours, the shipping lead time by the new method was 15 minutes. (c) While the inventory rate of accuracy by the current method was 85%, the inventory rate of accuracy by the new method was 98%.
A Study on Developing the guideline for Airport Sustainability
Kang, Sung-Ok ; Lee, Chang-Ho ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 157~165
DOI : 10.12812/ksms.2014.16.2.157
The interest about sustainable development of airport operation field has been increased as the aviation industry has been gradually developed and the influence to the neighboring area of airport has been increased. International organization and airport operator have issued a guidance manual with regard to the sustainability specialized in airport by adopting environment friendly rating system and developing a variety of sustainable practices. In this study, the guideline of sustainability manual appropriate to the local airports will be suggested by reviewing a variety of reference documents issued from foreign airport operators.
Energy Saving System of EHP Control at the College Lecture Room
Jeong, Kybum ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 167~174
DOI : 10.12812/ksms.2014.16.2.167
Heating and air conditioning system is changing rapidly from the traditional HVAC central supply system to the individual supply system with electrical heat pump system (EHP) in Korean school buildings. The individual supply system has advantages to turn on and off individually and to adjust the thermal comfort separately, but energy is wasted in the unoccupied classroom when the last leaving occupant does not turn off the controller. If the controller is to be off automatically while the classroom is not in use, energy consumption would decrease dramatically. This project aims to cease the unnecessary EHP supply in vacant classroom by inputting the class schedule from the central control room to reduce the energy-spending. Experimental measurements were carried out between the controlled classroom that is turned off when not in use and the uncontrolled room that is turned on continually. Occupant`s comfort and energy consumption were measured and compared between the controlled case and the uncontrolled case. The energy consumption of controlled classroom case is 30-60% less than that of the uncontrolled classroom case. This result shows that controlling the cooling supply for the unoccupied classroom using the class schedule can decrease the energy consumption remarkably. This supply control system can be used to conserve energy in school structures like universities.
The Effects of Learning Orientation on Self-Efficacy and Innovation Behaviors
Hwang, Sang-Kyu ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 175~184
DOI : 10.12812/ksms.2014.16.2.175
This paper examines how learning orientation and self-efficacy contributed to explaining innovation behaviors. In order to verify the relationships and mediating effect, data were collected from 368 individuals in employees working in small and medium-sized firms at Gyeongnam region to test theoretical model and its hypotheses. All data collected from the survey were analyzed using with SPSS 18.0. This study reports findings as follows: first, the relationship between the learning orientation and the employee`s self-efficacy is positively related. Second, there was also a positive correlation between the employee`s self-efficacy and the innovation behaviors. Third, the relationship between the learning orientation and the innovation behaviors is positively related. Finally, the employee`s self-efficacy played as a partial mediator on the relationship between learning orientation and innovation behaviors. Based on these findings, the implications and the limitations of the study were presented including some directions for future studies.
A Optimizing Study on maximizing the earning power of casting industry production through TPI
Kang, Byong-Rho ; Lee, Chang-Ho ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 185~192
DOI : 10.12812/ksms.2014.16.2.185
The production type of foundry industry is a small quantity batch production methods that require the highly skilled technology in the global competition in the variety of customer needs and directly under the influence of fluctuations characteristic. Therefore suitability for small quantity batch production and flexible production capacity and price competitiveness is needed more than anything. To do this, we need transcription and comprehensive innovation activities to maximize the revenue structure of the organization and field survival foundation should be developed the TPI(Total Profit Innovation) process in all aspects of the organization and all employees are involved in order to create a cost, quality, time, and service part of the overall aim how to achieve those effects within a short period of time. We applied the TPI process for S company in the foundry business innovation and productivity through cost reduction. We will expect the productivity improvement and financial performance improvement and then continually accumulate and review the results.
The effects of job characteristics on job satisfaction and stress, and the moderating effect of social support in food service business
Ahn, Kwan Young ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 193~201
DOI : 10.12812/ksms.2014.16.2.193
This paper reviewed the effects of job characteristics(role conflicts, emotional labor, job importance and job autonomy) on satisfaction and stress, and the moderating effect of social support. Based on 2,982 questionnaires among raw data of Korea Safety and Health Agency`s national survey, the results of multiple regression analysis appeared as follow; 1) role conflict effect negatively on job satisfaction, and emotional labor, job importance and job autonomy effect positively on job satisfaction. 2) role conflict effect positively on stress, and emotional labor, job importance and job autonomy effect negatively on stress. 3) social support moderates positively 2 relationships-between role conflict and job satisfaction, between job autonomy and job satisfaction, but moderates negatively between job autonomy and stress.
Phenomenological Study for re-employment process for middle or old-age people the Unemployed
Na, Hye Sook ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 203~210
DOI : 10.12812/ksms.2014.16.2.203
The purpose of this study is to understand the meaning and essence of concrete and practical experience on a series of debates to reveal factors that could be exposed when middle or old-aged people are in the process of re-employment process when they were unemployed by exploring the phenomenon of experience on the courses for the unemployed focusing on middle or old-aged people for employment support program. Depth consultation interviews were conducted and the structure of this phenomenon was revealed and described by applying Giorgi`s phenomenology technical as a procedure for analyzing participants` statements by concentrating on the essence of the experience in this study. The meaning of the experience of the unemployed re-employment process structure as a result of analysis on the nature of re-employment experience on the basis of research participants and the information stated through this study showed respectively such as
, and "Reemployment Success Factors>. It is a significant meaning that middle and old-aged people were able to confirm that they experienced Dynamic pursuit of hopes and dreams and got the chance to participate in society Toward a new life By strengthening employ ability skills by undertaking vocational training, obtaining licenses, and regaining confidence and employment determination, and a lot of desire using the card for learning tomorrow, government support system.
Winter to replace the hydraulic test and pneumatic test comparative analysis of study on the optimal pressure
Kwoun, Young-Hee ; Hwang, Dong-Hwan ; Kim, Tae-Gil ; Kang, Kyung-Sik ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 211~216
DOI : 10.12812/ksms.2014.16.2.211
Using a high-rise building water piping after hydrostatic test of the reliability of the leak to be completed if the pressure is maintained until the leak is not commercially available considered. Due to the nature of high-rise buildings and the construction period will take several years from the lower levels of use of the water supply and fire fighting water pipe construction is in progress, the order of which I do most of the first pipe to the construction and more than three years. So kind of riser pipe is complete, install the valve in the basement by installing an automatic pump to maintain a constant pressure after hydrostatic test and after each floor plumbing piping is complete, the progress of the hydrostatic test without undergoing a separate branch pipe the valve is opened automatically when the number of the pressing pressure of the structure. I kind of do and keep working pressure of pipe until the completion of the construction work to keep the damage to human error when it is intended to prepare. In winter, the frost protection and an alternative to drainage water pipe is damaged or deformed, even if unaware of the finishing work to the building, the use of the damage caused by a leak in a after construction of finish work to be expected. Alternative to reduce this damage if the pressure test without fear of freezing to help maintain long-term commercial pressures may be considered.
Implementation Strategy Based on the Classification of Depreciation Models
Choi, Sungwoon ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 217~230
DOI : 10.12812/ksms.2014.16.2.217
The purpose of this study is to develop the Generalized Depreciation Function (GDF) and Winfrey Depreciation Function (WDF) by reviewing methods for the depreciation accountings. The Depreciation Accounting Models (DAM), including straight-line model, declining-balance model, sum-of-the-year-digit model and sinking fund model presented in this paper, are reclassified into the charging pattern of increasing type, decreasing type and constant type. This paper also discusses the development of the GDFs based on convex type, concave type and constant type according to the demand pattern of product, frequency of plant usage, deterioration of time, relative inadequacy, Capital Expenditure (CAPEX) and Operating Expenditure (OPEX) of the Total Productive Maintenance (TPM). The WDFs presented in this paper depict a sudden degradation of plant performance by measuring the change of TPM activity at the midpoint of useful life of asset. The WDFs are classified into left-modal type, symmetrical type and right-modal type by varying the value of skewness and kurtosis. Moreover, three increasing patterns, such as convex, concave and linear types, are used in this paper to present the distinct identification of WFDs by using Instantaneous Depreciation Rate (IDR) in terms of Performance Depreciation Function (PDF) and Depreciation Density Function (DDF). In order to have better understanding of depreciation models, the numerical examples are used for evaluating the Net Operating Less Adjusted Tax (NOPLAT) and Economic Value Added (EVA). It is concluded that the depreciation models showing a large dispersion of EVA require the adjustment of NOPLAT and Invested Capital (IC) based on the objective cash basis and net operating activity for reducing the variation of EVA.
A Study on Collection Efficiency And Economy of Total Hydrocarbons in Accordance with Time Changes at Activated Carbon Collection Facility
Kim, Seong Jung ; Han, Dae Hee ; Woo, In Sung ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 231~236
DOI : 10.12812/ksms.2014.16.2.231
In this study, the changes in collection efficiencies due to the time changes of activated carbons were ascertained, and in order to identify the magnitude of adsorption, the before-use and after-use iodine adsorption values were analyzed. In addition, as a result of examining the characteristics of continuous process and non-continuous process and as a result of investigating whether the emission standards would be maintained, the continuous process and printing facilities were seen as not being able to maintain the emission standards. Also were found, in the case of non-continuous process,-taking into consideration the special nature of the job -for 4
palletized charcoal, a collection efficiency near 50% was shown even after 96 hours. Also, when the inlet concentration was about 300ppm, it is thought that the emission standards would be maintained if the activated carbons are replaced within at least 96 hours in the case of 4
palletized charcoal and the use was deemed pointless in the case of carbon. The results of this study are expected to provide assistance in selecting replacement periods for activated carbons and in selecting absorbents at the project sites, and are expected to be of significant help in the selection of precipitators that can collect total hydrocarbons for compliance of the emission standards.
A study of decomposition of sulfur oxides(harmful gas) using calcium dihydroxide catalyst by plasma reactions
Kim, Dayoung ; Hwang, Myungwhan ; Woo, Insung ;
Journal of the Korea Safety Management and Science, volume 16, issue 2, 2014, Pages 237~246
DOI : 10.12812/ksms.2014.16.2.237
Researches on the elimination of sulfur and nitrogen oxides with catalysts and absorbents reported many problems related with elimination efficiency and complex devices. In this study, decomposition efficiency of harmful gases was investigated. It was found that the efficiency rate can be increased by moving the harmful gases together with SPCP reactor and the catalysis reactor. Calcium hydroxide(
), CaO, and
were used as catalysts. Harmful air polluting gases such as
were measured for the analysis of decomposition efficiency, power consumption, and voltage according to changes to the process variables including frequency, concentration, electrode material, thickness of electrode, number of electrode winding, and additives to obtain optimal process conditions and the highest decomposition efficiency. The standard sample was sulfur oxide(
). Harmful gases were eliminated by moving them through the plasma generated in the SPCP reactor and the
catalysis reactor. The elimination rate and products were analyzed with the gas analyzer (Ecom-AC,Germany), FT-IR(Nicolet, Magna-IR560), and GC-(Shimazu). The results of the experiment conducted to decompose and eliminate the harmful gas
catalysis reactor and SPCP reactor show 96% decomposition efficiency at the frequency of 10 kHz. The conductivity of the standard gas increased at the frequencies higher than 20 kHz. There was a partial flow of current along the surface. As a result, the decomposition efficiency decreased. The decomposition efficiency of harmful gas
catalysis reactor and SPCP reactor was 96.0% under 300 ppm concentration, 10 kHz frequency, and decomposition power of 20 W. It was 4% higher than the application of the SPCP reactor alone. The highest decomposition efficiency, 98.0% was achieved at the concentration of 100 ppm.