• Advances in concrete construction
• /
• v.1 no.3
• /
• pp.201-213
• /
• 2013

While recognizing the problem of reinforcement corrosion and premature structural deterioration of reinforced concrete (RC) structures as a combined effect of mechanical and environmental actions (carbonation, ingress of chlorides), emphasis is given on the effect of the latter, as most severe and unpredictable action. In this study, a simulation tool, based on proven predictive models utilizing principles of chemical and material engineering, for the estimation of concrete service life is applied on an existing reinforced concrete bridge (${\O}$resund Link) located in a chloride environment. After a brief introduction to the structure of the models used, emphasis is given on the physicochemical processes in concrete leading to chloride induced corrosion of the embedded reinforcement. By taking under consideration the concrete, structural and environmental properties of the bridge investigated, an accurate prediction of its service life is taking place. It was observed that the proposed, and already used, relationship of service lifetime- cover is almost identical with a mean line between the lines derived from the minimum and maximum critical values considered for corrosion initiation. Thus, an excellent agreement with the project specifications is observed despite the different ways used to approach the problem. Furthermore, different scenarios of concrete cover failure, in the case when a coating is utilized, and extreme deicing salts attack are also investigated.

• Korean Journal of Construction Engineering and Management
• /
• v.19 no.4
• /
• pp.52-60
• /
• 2018

In the construction industry, attempts to evaluate the environmental impact of products through life cycle assessment (LCA) approach has been on the rise. However, the domestic construction industry needs to make rapid decisions due to limited budget and schedule, so it is difficult to carry out a review of the environmental load on all resources. The decision-making process requires information on the major influence factors that should be focused on to reduce environmental load. And this information should be quantified so that it can be linked to environmental impact assessment. In this study, the LCA results of road construction cases were analyzed to provide such information. As a result, diesel, ready-mixed concrete, urethane-based paint, aggregate, and asphalt concrete were found to be the main factors that generated 93.17% of the environmental load in the earthwork type of road project. The total environmental cost caused by these affecting factors when constructing 1 km of earthwork type of road project is 242 million won. The analysis also shows that a 10% reduction in the amount of ready-mixed and asphalt concretes can reduce carbon emissions by 5.02% and 2.28% while reducing environmental costs by 11 million won per kilometer. In order to reduce carbon emissions of the earthwork type of road project, it is necessary to actively develop and introduce new methods and eco-friendly materials to reduce the overall use of ready-mixed concrete and asphalt concrete.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.24 no.68
• /
• pp.85-94
• /
• 2001

Most of customers want to know how to develop the computer system they want to get to use according to the their requirements. This study presents a Computer Integration management System for Quality (CISQ) model for system-integration organizations, which need to demonstrate their capability to consistently provide computer integrated system that meets customer satisfaction and applicable regulatory requirements. The Plan.Do.Check.Act(PDCA) cycle called by Doming wheel expresses the basic concept of continuous improvement action in order to emphasize on achieving business goal. It is useful for providing full competence of a system-integration organization to integrate management systems based on the international management system, and to take an advantage in its market. This study specifies International Certification Network Business Excellence Concept(IBEC) approach to ensure a harmonized integration of the variety of management systems and thereby produce synergy effect. The end part of this study specifies a Assessment Model including an assessment concept adding to the compliance audit according to the CISQ for the continuous improvement. A simple application on Failure Modes and Effects Analysis(FMEA) in testing phase in project life cycle has been done.

• Clean Technology
• /
• v.29 no.1
• /
• pp.59-70
• /
• 2023

This study aims to introduce a biowaste processing system that uses spent coffee grounds and implement a real options method to evaluate the proposed process. Energy systems based on eco-friendly fuels lack sufficient data, and thus along with conventional approaches, they lack the techno-economic assessment required for great input qualities. On the other hand, real options analysis can estimate the different costs of options, such as continuing or abandoning a project, by considering uncertainties, which can lead to better decision-making. This study investigated the feasibility of a biowaste processing method using spent coffee grounds to produce biofuel and considered three different valuation models, which were the net present value using discounted cash flow, the Black-Scholes and binomial models. The suggested biowaste processing system consumes 200 kg/h of spent coffee grounds. The system utilizes a tilted-slide pyrolysis reactor integrated with a heat exchanger to warm the air, a combustor to generate a primary heat source, and a series of condensers to harness the biofuel. The result of the net present value is South Korean Won (KRW) -225 million, the result of the binomial model is KRW 172 million, and the result of the Black-Scholes model is KRW 1,301 million. These results reveal that a spent coffee ground-related biowaste processing system is worthy of investment from a real options valuation perspective.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.30 no.2D
• /
• pp.181-190
• /
• 2010

The purpose of this study is to propose an effective approach of making route decisions for the large-scale national project (i.e. the KTX Gyeongbu line between Daegu and Busan) by analyzing the conflicts that had occurred in the process of selecting the routes and stations. This study investigated policy making processes and conflicts during the construction of the KTX Gyeongbu line. The five contentious issues were 1) selecting the route between Daegu~Busan line, 2) developing a new route through Gyeongju areas, 3) making decisions of the first and second phases of construction, 4) setting up an extra station in Ulsan, and 5) conflicts of the Mt. Cheonseong route in Yangsan. In terms of analyzing these issues, the current study focuses on dealing with notions of technical, economical, legal, social, and practical rationality. Based on such analyses and implications, this study proposes a relatively reasonable model of line decision making especially for long-distance intercity routes. It also turns out that the large-scale project like the development of KTX Gyeongbu line should be conducted after receiving enough quantitative evaluation by reviewing relevant technical research studies and economic analyses, and having social agreements to prevent plausible conflicts.

• Journal of Environmental Impact Assessment
• /
• v.26 no.4
• /
• pp.242-256
• /
• 2017

In this paper, dispersion scenarios concerning various meteorological conditions and real urban structures were made to estimate the impacts of hazardous substance leakage accidents and to reduce damages. Based on the scenario of the hazardous substance dispersion, the characteristics of the risk in the pedestrian environment were analyzed in Gangnam, Seoul. The scenarios are composed of 48 cases according to the meteorological conditions of wind direction and wind speed. In order to analyze the dispersion characteristics of the hazardous substances, simulations were conducted using a computational fluid dynamic (CFD) model with hydrogen fluoride releases. The validation for the simulated wind was conducted at a specific period, and all the calculated verification indices were within the valid range. As a result of simulated dispersion field at pedestrian level, it was found that the dispersion pattern was influenced by the flow, which was affected by the artificial obstacles. Also, in the case of the weakest wind speed of the inflow, the dispersion of the hazardous substance appeared in the direction of the windward side at the pedestrian level due to the reverse flow occurred at lower layers. Through this study, it can be seen that the artificial structures forming the city have a major impact on the flow formed in urban areas. The proposed approach can be used to simulate the dispersion of the hazardous substances and to assess the risk to pedestrians in the industrial complexes dealing with actual hazardous substances in the future.

• Asia-Pacific Journal of Business
• /
• v.14 no.4
• /
• pp.387-399
• /
• 2023

Purpose - The purpose of this study is to review the export support projects in Jeollabuk-do and to provide implications to the policy makers and to the local exporters. Based on this review, the study proposes future measures to enhance the efficiency of the current Jeollabuk-do export support project. Design/methodology/approach - This study reviews export support projects in Jeollabuk-do, d examines program types and utilization status, and subsequently summarizes the key aspects of Jeollabuk-do SMEs' export support projects. Findings - This study suggests that Jeollabuk-do's export support project can become more effective through active development of overseas markets and professional integration of marketing activities, particularly focusing on regionally specialized export products. Additionally, given the crucial roles played by the government, related agencies, and local offices in improving the export capabilities of SMEs in Jeollabuk-do, there is an emphasis on the need for continuous and systematic follow-up management and the establishment of export support projects and services. Research implications or Originality - While small and medium-sized enterprises (SMEs) in Korea account for a significant portion of export activities, their actual export performance and contribution are low. The export competitiveness of SMEs, particularly those located in regions other than Seoul and Gyeonggi Province, is not improving despite various export support projects being promoted. Under the circumstances, this study provide meaningful implications to the policy makers and to the local exporters.

• Korean Journal of Health Education and Promotion
• /
• v.25 no.1
• /
• pp.105-115
• /
• 2008

For the development of Korean health promotion projects, this paper appraised the capacities of health promotion projects and examined the latest international trend of the health promotion field, based on the appraisal of data made by the Ministry of Health and Welfare, 2005 and IUHPE relevant reports. The capacities of Korean health promotion should be strengthened as follows: First, it is urgent to give health education and to use the professionals of it. Secondly, setting approach is required when working on health promotion projects. Thirdly, it is necessary to strengthen the capacities of local communities through the central government's administrative and financial supports for the healthy cities project which is a strategy of general approach to new public health projects. The $21^{st}$ century is an age of new public health that the cause for deaths increasingly is centered on life style. So it is necessary to expand the scope of health education to the field of making the environment of local community healthy beyond the level of individual health education. And further, it is required to develop the curriculum of health and to work out new strategies for health promotion. In conclusion, Korea should train competent human resources in the fields of practice of healthy public policies, of knowledge-based projects, and of health promotion (like health educators). The political direction for it should be to promote various healthy city projects, not only health center-led health promotion projects, and further, to strengthen the capacities of the health promotion projects of local communities.

• Korea Journal of Hospital Management
• /
• v.5 no.1
• /
• pp.129-155
• /
• 2000

This empirical study, activity-based costing, a newly introduced approach that has proved to be an improvement over the conventional costing system in product or service costing, is applied at department of clinical pathology in K university hospital. The study subjects were 233 test procedures done in clinical laboratory of K university hospital. Activity analysis was done by interview, questionnaires, and time study, and the amount of resources consumed by each activity and their costs are then traced and applied to the laboratory tests. The main purpose of this study were to compare the test costs of activity-bases costing with those of conventional costing, and test fees of medical insurance, and to provide accurate cost informations for the decision makers of hospital. The major findings of this study were as belows. 1. The cost drivers for application of activity-based costing at clinical laboratory were cases of sample collection, case of specimen, cases of test, and volume-related allocation bases such as direct labor hours and total revenue of each test. 2. The profits of each clinical laboratory fields analyzed by conventional costing were different from the profits analyzed by activity-based costing, especially in the field of Urinalysis(approximately over estimated 750%). 3. The standard full costs by conventional costing were quite different from the costs computed by using activity-based costing, and the difference is most significant with the tests of long labor time. 4. From the comparison between costs computed by using activity-based costing and medical insurance fees, some test fees were significantly lower than the costs, especially in the non-automated fields. As described in this study, activity-based costing provides more accurate cost information than does conventional costing system. The former approach is especially important in the health care industry including hospitals in which planning and controlling the costs services provided are the key to maintaining a healthy financial status for the organization. Despite the contribution of activity-based costing the economic as well as technical feasibilities of implementing such a cost accounting system in an organization must be evaluated. In the development of activity-based costing systems, an activity analysis has to be conducted to identify activities that consume resources. This involves a detailed study of the organization's logistics and accounting information systems, and it is an expensive project in itself. Besides, it can be quite difficult and time consuming to identify and trace resource consumption to a specific activity. Thus the activity-based costing system should be implemented only when the decrease in cost of error far exceeds the increase in cost of measurement. By combining activity-based costing with standard costing, health care administrators can better plan and control the costs of health services provided while ensuring that the organization's bottom line is healthy.

• International conference on construction engineering and project management
• /
• 2015.10a
• /
• pp.92-96
• /
• 2015

Due to unique characteristics of small construction companies, safety management is comprised of complex problems (e.g., resources constraints, a lack of formalized management structures, low level of management safety commitment etc.). In order to understand causal interdependencies between safety factors at different system levels (regulation, organization, technical and individual), this paper aims to develop a system dynamics (SD) model of safety management in small construction companies. The purpose of the SD model is to better understand why small construction companies have low level of safety performance. A causal loop diagram (CLD) was developed based on literature, with an attempt to map causal relationships between variables. The CLD was then converted into stock and flow diagram for simulation. Various tests were conducted to build confidence in the model's ability to represent the reality. A number of policies were analyzed by changing the value of parameters. The value of a system dynamics approach to safety management in small construction companies is its ability to address joint effects of multiple safety risk factors on safety performance with a systems thinking perspective. By taking into account feedback loops and non-linear relationships, such a system dynamics model provides insights into the complex causes of relatively poor safety performance of small construction companies and improvement strategies.