• Journal of the Korean Society of Systems Engineering
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• v.11 no.1
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• pp.9-24
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• 2015

Construction industry faces a lot of inherent uncertainties and issues and the construction phase of nuclear power project is not free from this risk. This paper investigates promising methodologies to be used on nuclear power plant (NPP) construction schedule delay risk assessment by using entry level systems engineering approach. This study contains how the initial concept for the risk assessment methodology has been developed. In this point of view, this work structured on three main phases: needs analysis (NA), concept exploration (CE), and concept definition (CD) through systems engineering (SE) approach. Traditionally, the SE process is applied to technical development programs but this study opens up a new avenue that SE can also be successfully applied to the development and optimization of the risk assessment model. This study provides a rational and systematic process for developing and selecting the best risk assessment model. This paper selects analytic hierarchy process (AHP) method to assess NPP construction schedule delay risk for international project. As conclusion, the proposed concept and selected method can discriminate successfully and clearly among schedule delay risk assessment methods.

• KCID journal
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• v.18 no.2
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• pp.43-53
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• 2011

In this study, the internal development of the Saemangeum basic concept of the changes being promoted as a lead construction and agricultural land works(54.2 km) has established a numerical model for the scenario. Inner dike to the construction site to reflect the following conditions to reproduce the numerical model by each areas during construction inner dike where scour expected to perform a numerical analysis for the hydraulic review by areas with possible future changes were to predict. Simulation results showed that numerical simulation results for scour expected frequency of 100 years in flood conditions is simulated with 0.02 m/s~l.27 m/s scour velocity for high-impact factor is considered to be stable. Each start point and end point work area of inner dike reviewed and flow rate of 100 years flood, the velocity distribution in the influx of a large flow rate of 0.02 m/s~1.68 m/s occur during construction inner dike are not being evaluated as a special issue does not occur will be considered according to the method and order of construction inner dike stability review suggests that the future need to be made.

• Korean Journal of Occupational Health Nursing
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• v.27 no.1
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• pp.48-58
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• 2018

Purpose: The purpose of this study was to understand the present status of the work performance of the construction industry health managers and the developmental direction for the construction industry health management. Methods: The subjects of this study were 149 health managers working in the construction industry. Data of a total of 130 participants were analyzed by excluding the missing data among field workers. The contents of the survey were the characteristics of the workplace, the difficulties and requirements of health management, and the level of job performance. Results: The factors affecting measuring work environment task were age, number of workers, number of safety managers, and lack of support from the headquarters. The factors affecting managing work environment and physicochemical harmful factors were age, type of contract and conflicting business opinions. The factors affecting implementing health examination were age, type of contract, and number of safety managers. The factors affecting healthcare were age, type of contract, number of safety manager, presence of healthcare room, and conflicting business opinions. Conclusion: It is necessary to provide practical guidance and practical resources, and education for strengthening capacity. The support for business owners and managers support is needed.

• Explosives and Blasting
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• v.31 no.1
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• pp.23-32
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• 2013

Construction vibration such as explosive blast, hydraulic breaker, vibratory roller, pile driving noise and so on, injuries in areas around the construction sites. In particular, underwater sound caused by ground vibration is propagation such as structure borne noise. Vibration and underwater sound due to construction activities may cause injury to river, sea or land fish farms near construction sites. The purpose of present study is to measure the sound pressure level and frequency analysis of the underwater noise generated by ground vibration(Blasting, hydraulic crawler drill, hydraulic breaker, vibratory roller). Underwater noise were monitoring by a hydrophone (TC 4013) and recorded, analysis were made using a by software (Prosig).

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.11
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• pp.3789-3809
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• 2014

Radio environment maps (REMs) and geolocation database represent an important source of information for the operation of cognitive radio networks, replacing or complementing spectrum sensing information. This paper provides a survey of methods for constructing the radio frequency layer of radio environment map (RF-REM) using distributed measurements of the signal levels at a given frequency in space and time. The signal level measurements can be obtained from fixed or mobile devices capable of sensing radio environment and sending this information to the REM. The signal measurements are complemented with information already stored in different REM content layers. The combined information is applied for estimation of the RF-REM layer. The RF-REM construction methods are compared, and their advantages and disadvantages with respect to the spatial distribution of signal measurements and computational complexity is given. This survey also indicates possible directions of further research in indirect RF-REM construction methods. It emphasizes that accurate RF-REM construction methods should in the best case support operation with random and clustered signal measurements, their operation should not be affected by measurements outliers, and it must estimate signal levels comparably on all RF-REM locations with moderate computational effort.

• Steel and Composite Structures
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• v.19 no.3
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• pp.661-678
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• 2015

Buckling Restrained Braces (BRB) have been widely used in the construction industry as they utilize the most desirable properties of both constituent materials, i.e., steel and concrete. They present excellent structural qualities such as high load bearing capacity, ductility, energy-absorption capability and good structural fire behaviour. The effects of size and type of filler material in the existed gap at the steel core-concrete interface as well as the element's cross sectional shape, on BRB's fire resistance capacity was investigated in this paper. A nonlinear sequentially-coupled thermal-stress three-dimensional model was presented and validated by experimental results. Variation of the samples was described by three groups containing, the steel cores with the same cross section areas and equal yield strength but different materials (metal and concrete) and sizes for the gap. Responses in terms of temperature distribution, critical temperature, heating elapsed time and contraction level of BRB element were examined. The study showed that the superior fire performance of BRB was obtained by altering the filler material in the gap from metal to concrete as well as by increasing the size of the gap. Also, cylindrical BRB performed better under fire conditions compared to the rectangular cross section.

• Journal of the Korea institute for structural maintenance and inspection
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• v.5 no.2
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• pp.183-190
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• 2001

A sub-structure is uplift if the floating greater than dead load of a structure. When such occasion arise, a structure sustain damage. In general, the measures for floating prevention of structure are a permanent anchor method and a drainage method. The primary construction cost of a permanent anchor method is heavy. And a drainage method is needed maintenance management long term. At this point, the measures for floating prevention of a notion being requires the other days. Therefore, at this study a simple construction and a economic vertical drainage system was developed. The findings be used in the in-situ and gave careful consideration to an application. The result of examination, this system considering a characteristic of coefficient of permeability for the ground controls occurrence of floating despite the water level rise of the ground, which a period of construction get shorter compared with other methods, which understood that measures satisfactory in the financial aspect. Especially, A structure occurring effects of flatting under the course of construction made use of it. As the result of the effect of it was confirmed by construction.

• Korean Institute of Interior Design Journal
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• v.23 no.1
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• pp.105-113
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• 2014

It is the purpose of the this study to use preliminary data to improve job environment, after looking job satisfaction and environment of interior construction workers. The following were the method of study. First, Through the literature, concept and the main theory on job satisfaction are examined. And It draws elements affecting job environment and satisfaction of interior construction workers. Based on this, we analyze job environment and satisfaction, and find what the satisfaction level is low, after a survey of interior construction workers. According to the survey, the result of the job environment is poor that people are working a lot more than a standard 10-hour day, not paid for it and absence of the education system for future. The larger workplace was in poor job conditions. the result of the job satisfaction is higher in case of smaller workplace or workers with less than 1 year or more than 8 year. As job satisfaction for interior construction score 3.30, it showed relatively higher satisfaction than job environment and satisfaction elements.

• Journal of the Korea Institute of Building Construction
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• v.10 no.1
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• pp.121-126
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• 2010

When constructing housing, various factors affect the housing purchase price. These factors are considered in the whole process of construction, and the feasibility of a project is then studied based on these factors. Recently, Highest-end Housing in Gangnam has a large market ofpotential and fixed clients in the Korean construction business. However, there has been a lack of research related to the Highest-end Housing market thus far. Therefore, this paper focuseson the factors affecting the Highest-end Housing price, and the level of the effect. Ultimately, the results of this research could be used as basic information for enhancing the competitiveness between the construction companies that build villa apartments,and support the business model.

• Journal of Korean Society for Quality Management
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• v.47 no.3
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• pp.553-569
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• 2019

Purpose: The purpose of this study is to identify the impact of conflicts and cooperation on project performance in the nuclear power plant construction project, thus contributing to the successful performance of project participants and the achievement of project objectives. Methods: This study used a method of conducting a survey of participants in the nuclear power plant construction project and verifying the hypothesis statistically. Results: The results of this study are as follows; First, role conflicts and relationship conflicts have negative effects on collaboration. Second, role conflicts have a negative effects on project performance, but conflict in relation has no significant effects on project performance. Third, collaboration has a positive effects on project performance. Finally, the communication quality in the relationship between conflict and collaboration has been shown to have a Moderated effect. Conclusion: In order to achieve the goal in the nuclear power plant construction project, the level of collaboration should be improved based on conflict management among project participants.