• 한국건설관리학회논문집
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• 제6권1호
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• pp.49-57
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• 2005

Construction labor productivity, which is the greatest source of variation in overall construction productivity, is the critical factor for determining the project performance in terms of time and cost, especially during scheduled overtime when extra time and cost are invested. The objective of this research is to select an appropriate type of probability distribution function representing the variability of daily labor productivity during overtime. Based on the results of statistical data analysis of labor performance during different weekly work hours, lognormal distribution is selected in order to take advantage of easiness of generating correlated random numbers. The selected lognormal distribution can be used for development of a simulation model in construction scheduling, cost analysis, and other applications areas where representation of the correlations between variables are essential.

• Journal of Construction Engineering and Project Management
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• 제5권1호
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• pp.40-46
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• 2015

This study presents the results of our analysis and recommendations for process and productivity improvements. The project studied consists of a 5-story research building, with a structure of steel frames supporting concrete slabs. The observations focused on the analysis of the overall erection and framing process. The methods used for the analysis consisted in intensive visits on site, where construction processes were observed in term of resources, activities, durations, materials' handling procedures, and technology used. Back to the office, authors used the information captured to model the different trades' activities, using work sampling and 5-minute rating technique. The work sampling provides insight into the activity, hence allowing for process improvements. The productivity of various trades is strongly dependent on the organization of the work process and work site conditions. Improving the productivity of the entire project or company is not possible until everyone is committed to improvement.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1140-1147
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• 2009

Productivity measurement of construction machinery is a significant issue faced by many contractors especially those involved in earthwork projects. Traditionally, equipment production rate has been estimated using data available in manufacturers' catalogues, results of previous construction projects, or personal experience and assessments of the site personnel. Actual production rates obtained after the completion of a project demonstrate the fact that most of these methods fail to provide accurate results and as a direct consequence, may lead to unrealistic project cost estimations prepared by the contractors. What makes this more critical is that in most cases, inadequate cost estimations lead the entire project to exceed the initial budget or fall behind the schedule. In this paper, a linear regression method to estimate bulldozer productivity is introduced. This method has been developed using SPSS-16 software package. The presented method is used to estimate the productivity of Komatsu D-155A1 series which is commonly used in many earthmoving operations in Iran. The data required for the numerical analysis has been collected from actual site observation and productivity measurement of 60 pieces of D-155A1 series currently being used in several earthmoving projects in Iran. Comparative analysis of the output data of the presented regression method and the existing productivity tables provided by the manufacturer shows that when compared to the actual productivity data collected on the jobsite, a significant increase in accuracy and a remarkable reduction of data variance can be achieved by using the presented regression method.

• 한국병원경영학회지
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• 제12권1호
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• pp.100-127
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• 2007

The purpose of this study is to reform the productive industrial relations in hospital. Because the industrial relations of hospital is antagonistic each other and this problem cause a low productivity. In Korea, hospitals maintain their ownership structure, strategy is controlled by government, short process of management, and culture of grade. The executive of hospital doesn't gain the confidence of union. This circumstances is related with the antagonistic industrial relations. This research is to analyze hospital management system through experiential and literature study, and is to present a reform strategies for cooperative industrial relations of improving productivity in hospital. As a results, if the hospital manager hopes to improve productivity, they should introduce expert management system rather than ownership and management system. And it is need to execute the hospital initiative strategy rather than to depend on the government. Moreover, the hospital can achieve productive industrial relations as a middle-long term visions in management process and horizontal organization culture. Although this study is limited by literature research, it will contribute to settle productive industrial relations in hospital and to accomplish the additional study.

• 한국건축시공학회지
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• 제5권1호
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• pp.75-79
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• 2005

The Korean society faces a new issue of accepting foreign workers. Foreign labors in construction industry reached about 400,000 recently. Thus they have become one of the essential resources to fill up insufficient labor supplies in construction industry. And it is important how to manage foreign labors efficiently. However there are few studies focused on this subject. Purpose of this study is to research productivity of foreign labors in the domestic construction site. So investigate the value of foreign labors. Also this study forecast elements effect on foreign labors productivity in the construction industry. And research what element is more important to improve productivity and what element is more difficult to manage. In the result, this study is expected to prospect effective method of foreign labor's management in the domestic construction industry, so contribute to utilize foreign labors more efficiently.

• Journal of Information Technology Applications and Management
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• 제27권1호
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• pp.1-13
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• 2020

This study aims to measure the efficiency and productivity change of 30 domestic construction companies from 2010 to 2018 using data envelopment analysis(DEA) and Malmquist productivity index (MI). In particular, we used the number of employees, capital stock, and non-current assets as input variables, and sales and net income as ouput variables for the analysis. The dataset used for the analysis of efficiency and productivity changes is the employee profile and financial statements for the companies from 2010 to 2018. We found that the MI of the 30 companies is greater than one since 2013. This is because many years of TEC (Technical Efficiency Change) is greater than 1, which means that the productivity index increases as the TEC increases. In addition, the MI value was less than 1, which lowered the productivity of construction firms in 2018. The results of the study may help decision makers to find effective future management plans by analyzing the internal and external factors.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2004년도 제5회 정기학술발표대회 논문집
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• pp.427-432
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• 2004

최근 건설시장의 경쟁이 치열해지고, 건설생산성을 향상시키는 것이 기업의 경쟁력 확보라는 인식이 높아짐에 따라 건설업에서도 생산성과 효율성에 대한 관심의 풍요도가 증대되고 있다. 본 연구에서는 기존의 생산성 측정 방식을 활용한 사례조사를 통해 생산성을 측정하고 측정된 내용에 근거하여 작업개선사항을 제시하였다. 제안된 개선사항은 시뮬레이션(simulation)기법을 동해 검증하였다. 본 논문의 의의는 생산성 측정을 분석하는데 있어 시뮬레이션 기법이 현장여건을 모두 고려한 최적의 대안은 아니지만 현장관리자로 하여금 상황에 적합한 최적의 작업방식을 선택하게하고 생산량을 예측할 수 있는 방법을 제시했다는 점에 있다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.670-673
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• 2007

최근 국내 건설 산업에서 생산성과 건설공기 측면에서 문제점이 드러나고 있으며 또한, 국내 건설 산업의 생산성과 공기 경쟁력이 선진국에 비해 매우 낮은 것으로 분석되었다. 여기에 주5일 근무제가 시행된다면 문제는 더 심각해진다. 또한, 현재 입법 예고된 후분양제도가 실행된다면 건설사 입장에서는 공기 단축을 위한 생산성 향상이 건설업의 생사가 달린 일이다. 이에 본 연구에서는 생산성 향상을 위한 방안으로 PC의 한 종류인 건축 외관용 PC를 제시하고, 건축 외관용 PC를 사용하는 방안을 기존의 공법과 비교를 통해 생산성이 향상 되는가를 분석하고자 한다.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.142-146
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• 2015

Human resources development is considered a critical issue for improving productivity of workers in construction industry. The aim of this study is to identify and rank the key motivating factors that impact skilled workers productivity according to their relative importance. A total of 27 factors were identified through a literature review, which were categorized into 2 group financial and un-financial motivators. A questionnaire instrument was adopted in this study. The study revealed that the most significant group which affected skilled workers' productivity in construction projects was financial group with the recognition of the un-financial group importance. The results emphasized that the financial group has an edge over the un-financial group which reflect the priority of need for the respondents. The results indicated that the un-financial group represents a backbone in its importance after the financial group which reflects that un-financial factors can improve productivity. The findings showed that the provision of companies to safety conditions factor such as protective safety clothing and protective equipment was ranked very low by the respondents. This is due to the dominant culture of the workers as well as the lack of their awareness regarding their own safety and lack of companies' interest in safety and health for workers. Construction companies are advised to take the key motivating factors obtained from the results of this study into serious consideration in order to improve the satisfaction of their workers and improve their productivity.

• 대한안전경영과학회지
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• 제19권3호
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• pp.109-115
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• 2017

In order to increase the productivity of the logistics center and transportation, we try to articulate the priority ranking factors of the productivity influenced by the personality of the field workers (logistics center workers) and functional workers (drivers) via the AHP technique Individual personality was studied by applying the Big 5 model of psychological factors (openness, Conscientiousness, extroversion, Agreeableness, neuroticism). In this paper, extraversion was critically analyzed as a priority factor. A trait of extroversion is a strongly active and individual personality. In this study, the field workers are logistics center workers and the functional workers are drivers. They are interactively influenced in the In & Out operation. For example, when it comes to 'up and down work' and 'inspection work', the functional workers perform 'up and down work' and 'delivery work' and the field workers perform 'inspection work'. Stressing on the respective work has an affect on work productivity. Inspection workforce has something to do with inventory management. Functional workforce affects the delivery workforce. Delivery work is positively correlated with customer satisfaction. Nevertheless, as a result of research, extrovert personality that has something to do with an energetic activity would not affect on the implementation of their operation. In addition, personal extraversion of workers and drivers in the warehouse can have a significant impact on job commitment and productivity improvement.