• Korean Journal of Construction Engineering and Management
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• v.25 no.3
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• pp.27-36
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• 2024

The effective control of cost overrun is a crucial issue for construction companies to secure profitability. Especially in situations where cost pressures are significant due to factors such as rising raw material prices and increased financial costs due to high-interest rate policies, cost overruns resulting from project failures have a highly detrimental impact on the profitability of construction firms. The objective of this study is to analyze the current status of cost overrun control measures adopted by construction companies using the IPA technique and provide key characteristics and implications. The IPA analysis results showed that practitioners in general contractors exhibit a high level of interest and effort regarding cost overrun while the performance level is relatively low. Nevertheless, the measures considered important to control cost overruns generally show a high tendency for execution as well. Cost overrun control measures that show high importance but low execution are primarily related to collaboration and communication sectors. To effectively control cost overruns, enhancing collaboration and communication with construction supervisors/CM, headquarters, and regulatory authorities emerged as the most urgent need. Through this study, the current status and areas for improvement regarding cost overrun control measures in general contractors can be identified. This can be valuable for deriving directions and enhancements for future cost overrun control strategy development.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.22 no.50
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• pp.55-63
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• 1999

Past studies on economic control charts for controlling process means assumed that the measures of a quality characteristic do not have measurement error. In practice, however, this assumption is frequently violated. In this paper, the economic design models of three control charts(Xbar control chart, Xbar control chart with warning limits, and CUSUM control chart) for controlling process means are developed on the assumption that the measures can have measurement error. The effects of measurement error on the process control cost and design parameters of three economic control charts are examined. According to the experiments done in this study, when measurement error exists, the economic CUSUM control chart has lower process control cost in comparison with two other control charts. When measurement error becomes larger, both the sample size and the sampling interval increase while the control limits decrease.

• Journal of applied mathematics & informatics
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• v.18 no.1_2
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• pp.455-464
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• 2005

In this paper, we analyze a queueing system with overload control by arrival rates. This paper is motivated by overload control to prevent congestion in telecommunication networks. The arrivals occur dependent upon queue length. In other words, if the queue length increases, the arrivals may be reduced. By considering the burstiness of traffics in telecommunication networks, we assume the arrival to be a Markov-modulated Poisson process. The analysis by the embedded Markov chain method gives to us the performance measures such as loss and delay. The effect of performance measures on system parameters also is given throughout the numerical examples.

• Journal of the Korean Professional Engineers Association
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• v.35 no.4
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• pp.48-51
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• 2002

Due to locally torrential downpours which shows Increasing trend, high tide of the southern sea of Korea and etc. submerged and Inundated districts at the lowlands of Nakdong River Basins has been Increasing year by year In order to protect flood hit, it is necessary to make an early implementation of flood control dam and other flood protection works according to Nakdong River Comprehensive Development Project. In addition to the large scale comprehensive projects, local key measures, such as lowland development control, embankment reinforcement, leakage protection, maintenance and management of facilities, increase in pumping station, will be highly effective.

• Journal of Korean Institute of Industrial Engineers
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• v.23 no.3
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• pp.501-514
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• 1997

Manufacturing is fast entering a new age of industrial excellence that is being called "Agile Manufacturing." The goal of Agile Manufacturing is to link customers, suppliers, and the manufacturing system into a super-efficient confederation to produce a variety of products quickly and at a low cost. In order to improve the quality of the study of production input control(PIC) in a job shop manufacturing system by reducing the significant gap between research models and models of actual manufacturing systems, the previous line of research on PICs in a job shop manufacturing system is extended by integrating customers and suppliers with the manufacturing system. Then, a set of measures is developed to evaluate PICs, measures that reflect concerns of customers and suppliers as well as concerns of the manufacturer. Also, a weighted overall measure (with various cases to represent different possible weights of manufacturer's emphasis on the performance measures) is used to synthesize all the performance measures. Then, for each case, various existing PICs are evaluated in combination with various priority dispatching rules(PDRs).

• Journal of The Korean Society of Integrative Medicine
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• v.3 no.2
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• pp.9-16
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• 2015

Purpose: The purpose of this research was to ascertain the effect of Micro-current on a pain, balance, of knee joint in the patients with degenerative arthritis. Method: The 30 subjects who had micro-current in this research and randomly assigned into two group, an experiment group and a control group. micro-current was applied to 15 subject in the experiment group after general physical therapy. experiment group was applies general therapies and micro-current stimulation. The measurement were analyzed by using SPSS(V.20). In order to compare the post to the amount of pre-changes and post-changes of each group, the paired t-test was used. The difference between the experiment group and the control group was analyzed by using the analysis of convariance. Results: The results of this study were as follows; 1) In VAS measures, the pain point was significantly decreased in both the experimental and the control group. 2) Mc Gill Pain Questionnaire(MPQ), the pain point was significantly decreased in both the experimental and the control group. 3) TUG measures, the second was significantly decreased in both the experimental and the control group. 4) Weight distribution measures, the authority was significantly decreased in both the experimental and the control group. Conclusion: The micro-current is considered a degenerative knee arthritis that can be presented as an effective physical therapy intervention.

• 제어로봇시스템학회:학술대회논문집
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• 1990.10a
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• pp.62-67
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• 1990

A number of performance measures have been proposed for the quantification of dexterity for kinematically redundant manipulators. The use of such measures is especially important for kinematically redundant manipulators since they can satisfy the subtasks such as singularity avoidance and obstacle avoidance in addition to satisfying a specification of end-effector motion. In this paper, the advantages and disadvantages of performance measures proposed up to date are compared through simulations under the same environment. Besides, a new dexterity index for manipulators with multiple degrees of redundancy is proposed and shown to be effective through the simulation.

• Proceedings of the Korean Geotechical Society Conference
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• 1993.05a
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• pp.28-44
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• 1993

Remediation actions in uncontrolled landfill site should be conducted after the investigation of contamination status and potential health risk or damage. Based on the above, proper control measures should be established and operated. Also continuous monitoring should be followed. In this study, the status of ground water contamination around Nanji Landfill Site was investigated. Monitoring wells were installed around the landfill and ground water was sampled once a month and analyzed. Water quality of each monitoring well was different depending on the horizontal and vertical distance from the landfill, and the seasonal leachate characteristics were not significantly changed because percolating water stayed long time in the deep waste layer. It was predicted that major multivalent cations were mainly precipitated as metal carbonate form, and chemical mass balances (CMBs) could be applied for the apportionment of leachate contamination to ground water quality of surrounding areas of Nanji Landfill. Parameters required to estimate pollutant flux to the receptor near landfill were listed and discussion to get these parameters was made. Finally, based on the above data, control measures of ground water contamination were suggested and discussed.

• Journal of Korean Biological Nursing Science
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• v.13 no.1
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• pp.16-22
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• 2011

Purpose: Hand washing has received renewed emphasis in recent years as Swine flu epidemic threaten health of public. This study aimed to describe measures used to prevent new types of influenza (NTI); describe hand washing frequency; and analyze the relationship of hand washing to locus of control, uncertainty, and state anxiety. Methods: One hundred thirty three adults participate in the questionnaire survey in which participants indicated measures they used to prevent NTI, frequency of handwashing for the prevention of NTI. They also responded to questions related to locus of control, uncertainty and state anxiety. Data were analyzed using descriptive statistics, Pearson correlation and multiple regression. Results: A majority (66.9%) of the participants indicated that handwashing was an important measure to prevent NTI. Importance of hand-washing was related the highest among the measures they used and it was significantly related to participants who had high score in internal locus of control. Other significant factor to the hand-washing behavior was state anxiety, which explained 6.9% of the frequency. Conclusion: According to the results of this study, majority of participants indicated that handwashing was one of the most important measures to prevent NTI. Nurses need to continue educating public the importance of handwashing and pay attention to personal characteristics such as internal locus of control and anxiety to promote hand-washing.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.23 no.2
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• pp.137-147
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• 2013

Objectives: This study was conducted in order to evaluate the limitations of the regulations on the safety and health standards for special management materials(SMM) under the Industrial Safety and Health Act in Korea. Methods: Hazardous chemicals management systems in Germany(Hazardous Substances Ordinance), the UK(Control of Substances Hazardous to Health Regulations), Japan(Ordinance on Prevention of Hazards due to Specified Chemical Substances) and Korea(Regulation of Occupational Safety and Health Standards, ROSHS) were investigated and compared in terms of 14 items. Results: Among the 14 items, we eventually found seven items which should be amended: 1) definition and scope, 2) general duties clause, 3) principles of management, 4) preventive measures, 5) control measures, 6) risk assessment, and 7) record keeping. The principal limitations of Korean regulations in comparison with those of other countries were that there were no preventive measures such as substitution, and no principles of good practices for the control of exposure to SMM. In terms of control measures, there were no regulations on suitable workplace design, reducing the number of exposed workers, reducing the level and duration of exposure, and reducing the quantity of hazardous substances in ROSHS. Conclusions: Based on the results of this study, ROSHS should be complemented with preventive measures and the principles of management related to SMM. According to the suggestions, an employer who deals with SMM should preferably consider the possibility of substitution and perform substitution so far as is reasonably practicable.