• Journal of Korean Society for Geospatial Information Science
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• v.13 no.3 s.33
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• pp.69-77
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• 2005

Most of the evaluations of environmental effect of construction of road do not run parallel with the evaluation of the propriety of the business, but it just reviews how to reduce contamination before the beginning of the construction work. This reveals the limitation of the induction of environment friendly development from the fundamental. In this study, a function of GIS spatial analysis for 9 elements of pre-evaluation of environmental effect has been introduced, and a GIS decision making system for environmental effect of a road has been established for an integrated evaluation by using individual evaluation result. By using GIS decision making system for pre-evaluation of environmental effect that has been developed in this study and the GIS data that has been collected, it would be possible to decrease time and money for evaluation as well as fulfill the requirement of objectivity. Therefore, it would be possible to apply for pre-evaluation of environmental effect when deciding on the route of the road at the beginning stage of the construction work. Also, through the system developed in this study, the construction body could easily induce a mutual agreement with the residents by the visual evaluation material, which might result in an evaluation of environmental effect while decreasing time and money at the beginning stage of the construction.

• Journal of the Korean Geotechnical Society
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• v.18 no.1
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• pp.101-112
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• 2002

In this study, a new methodology fur the assessment of liquefaction potential is proposed and characteristics of the proposed methodology are verified. The experimental parameter of this methodology, that is, the plastic shear strain trajectory, is compared with the dissipated energy. It is shown that this parameter can express the liquefaction behavior which is generated by excess pore water pressure. This methodology takes advantage of the shear strain time history determined from the site response analysis based on the real time history of earthquake. In this site response analysis, shock type and vibration type records of similar predominant frequency are inputted. The liquefaction safely factors based on the proposed methodology and Korean detailed assessment related to the classical method are calculated from the results of the site response analysis and laboratory dynamic tests. Through this study, it is found that the proposed methodology can not only simulate the liquefaction behavior of saturated soils hut also express the seismic characteristics reasonably : leading type, predominant frequency, maximum acceleration, duration time.

• Journal of Korea Port Economic Association
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• v.31 no.4
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• pp.17-38
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• 2015

The purpose of this study is to suggest new methods for evaluating the benefits of a preliminary feasibility study for port construction. For this purpose, this study analyzes the problem of barge loading and unloading systems, and suggests new methods such as using neighboring same kinds of ports first. The study also estimates the benefits for ports that have been evaluated by the existing theory, using the newly suggested methods. The result suggests that there is a possibility to reduce the level of economic feasibility for both general and container-exclusive ports by applying the newly suggested methods.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.2 no.2
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• pp.1-22
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• 2007

This paper is targeting on developing pre-test Methodology for start-up as tuning successful business modelling with their implementation. Start-up is asked to a complete preparation and analysis for business to enhance the success possibility. In this stream, Start-up should test the validity of their business model before starting a business. This paper deliver alternatives to meet this requirement. Overall, this paper suggest two different approaches. First, by literature review, this paper prove the importance of BM in success factor analysis of high-tech start-up. Second, This paper prove BMO Model as the best practicing model to assess the validity of BM. Additionally, this paper, BMO will be utilized to bring significant implications to sort out enhancing strategies of BM validity.

• Korean Journal of Construction Engineering and Management
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• v.8 no.6
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• pp.129-138
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• 2007

According to the preceding research outcomes, feasibility studies on public construction projects were incorrect and subjective. To resolve the problems, Korean government initiated Preliminary Feasibility Study (PFS) system prior to undertaking the main feasibility study. The PSF can be categorized into four areas such as road, railroad, harbor, airport, and Culture & Tourism (C&T). Especially when it comes to complex due to the introduction of five-weekday working system and local $government^{\circ}{\phi}s$ self administrative system. As a result, the standardization and legislation of the PSF can not be operated effectively. Accordingly this paper seeks to 1) identify actual condition of conducted PSF in C&T; 2) set up analytical model considering cost factor of economical efficiency and seek obstacles of PSF system; 3) suggest improvement plan for construction PSF projects.

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.7
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• pp.1391-1397
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• 1992

Improved power law flow model was suggested for the calculation of wake flow characteristics around the three dimensional ship stern in case of the formation of bilge vortex in the direction of stern. In comparison with the power law and Coles flow model, the flow velocity calculated based on this study was delayed around the boundary of inner layer and outer layer in reverse flow. More accurate results was obtained with this improved power law flow model by the velocity calculation around ship stern. Accuracy was validated with the comparison of other calculation results and experimental datas.

• Journal of Drive and Control
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• v.15 no.2
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• pp.22-31
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• 2018

This study deals with verifying the design feasibility, of an independently driving hydraulic system for disaster response purposes, through an analytical approach. The development target is a system in which four traveling motors are driven independently, and must be easy to operate even under conditions in which different loads are applied to the traveling motors. In order to be suitable for complex work, the hydraulic system was designed using the main control valve with a pressure compensation function. If we can develop an analytical model that reflects the specifications and functions of the parts through the analysis program, we can verify the validity of the design before we make the prototype. The purpose of this study therefore, is to verify the feasibility of designing an independent drive hydraulic system through the development of an analysis model from the viewpoint of complex work. The analysis program uses Simulation X.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.167-169
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• 2018

2020년부터 전 세계적으로 IMO 선박연료유 규정은 한층 강화될 것으로 예상되며, 일부 지역은 배출규제해역(Emission Control Area; ECA)를 지정하여 선박으로부터 배출되는 대기오염물질을 통제하고 있다. 우리나라는 항만도시의 대기오염 정도가 높으며 대기오염물질의 주요 배출원은 선박으로 밝혀지고 있어 이에 대한 대책으로써 ECA 지정을 위한 검토가 시급하다. 본 연구에서는 국내 항만을 대상으로 ECA 지정 필요성을 검토하고 우리나라 여건에 적합한 ECA 지정방식과 절차 등 종합적인 도입방안을 제시하는 것을 목적으로 한다. 연구목적 달성을 위해 우리나라 항만도시의 대기환경 현황을 분석하고, 해외 ECA 지정 사례 분석을 통해 그 지정현황, 규제 수준 및 효과를 파악하였다. 또한 ECA 도입 타당성을 제시하기 위해 항만도시 거주민과 업계 종사자를 대상으로 수행한 설문조사 결과를 활용하였다. 결과적으로, 우리나라의 ECA 도입은 필요하며 향후 5년을 목표로 단계적으로 추진하는 것이 바람직하다. 우선적으로 자발적으로 영해 내 ECA 도입을 추진하되, 선박 통항량이 많은 주요항만구역을 대상으로 한다. 제도의 초기 장착을 위한 인센티브 제도 마련, 관리인력 확보 및 법 제도 구축을 통해 실효성을 확보하도록 해야 한다. 장기적으로는 IMO 승인을 통해 ECA가 이행될 수 있도록 타당성 조사가 선행되어야 한다.

• The Mathematical Education
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• v.51 no.3
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• pp.265-280
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• 2012

This study aims to provide implications from mathematics education perspective by designing a process of 'validity review on the problem solving process', and then, by analyzing the results. In the result of analysis on the features of children's thinking in accordance with 4 stages of problem solving, children's thinking was equally observed in every stage rather than intensively observed in one stage, and reflective thinking related to important elements from each stage of problem solving process was observed. In the result of analysis of changes in description for problem solving process, there was a difference in the aspects of changes by children's knowledge level in mathematics, however, the activity of validity review on problem solving process in overall induced positive changes in children's description, especially the changes in problem solving process of children. Through the result of this study, we could see that the validity review on problem solving process promotes children's reflective thinking and enables meta-cognition thus has a positive influence on children's description of problem solving process.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.364-367
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• 2007

According to increase of construction projects which is accomplished in the town, diaphragm wall method was proposed. This method diminished noise and vibration. And it is able to excavate deeper than other methods. But excavation work is difficult to maintain vertical and requires much time to work. Also the work result depends on know-how, experience and intuition of excavating machine operator. We interviewed technical experts related with slurry wall method and find equipment's characteristics. We used cost-concern matrix to investigate the propriety for the introduction of trench cutter automation. Through the research, it is proper to apply trench cutter automation.