• KSCE Journal of Civil and Environmental Engineering Research
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• v.37 no.2
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• pp.419-425
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• 2017

Managing mega construction project is a very challenging task due to its large scale and complexity. To deal with the challenge, progress measurement must be estimated reliably and effectively. Many researchers have presented progress measurement methods, but previous studies are limited to single or several types of facilities. Thus, they have difficulties to being applied to mega construction projects that covers multiple facilities. To overcome the limitations, this paper proposes a progress measurement framework considering characteristics of mega construction projects. The framework consists of four phases : development of Work Breakdown Structure, determination of weights of main facilities and sub facilities, and calculation of the integrated progress rate. To validate the proposed approach, a case study of Sejong city in Korea was performed. The results of the case study showed the applicability of the proposed framework and confirmed that it enables to reliably measure progress rate of mega construction projects.

• Journal of the Korean School Mathematics Society
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• v.13 no.3
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• pp.397-413
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• 2010

On the standards or elements of teaching evaluation, the Korea Institute of Curriculum and Evaluation(KICE) has carried out the following research such as : 1) development of the standards on teaching evaluation between 2004 and 2006, and 2) investigation on the elements of Pedagogical Content Knowledge including understanding of learners between 2007 and 2008. The purposes of development of mathematics teaching evaluation standards through those studies were to improve not only mathematics teachers' professionalism but also their own teaching methods or strategies. In this study, the standards were revised and modified by analyzing the results of those studies (namely, evaluation standards) focused on the knowledge of teaching contexts. For this purpose, application of instructional tools and materials, commercial manipulatives, environment of classroom including distribution and control of class group, atmosphere of classroom, management of teaching contexts including management of student were re-established based on the results of the search mentioned above. According to those evaluation domains, elements on teaching evaluation focused on the knowledge of teaching contexts were established.

• Journal of Korean Society of Steel Construction
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• v.14 no.6
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• pp.783-791
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• 2002

An improved formulation for multi-objective optimization was proposed. This formulation was applied to steel seismic loads. The multi-objective optimization problem was formulated with minimum structural weight, maximum strstability. The global criterion method was employed to find a rational solution closest to the ideal solution for the optimization problem using standard steel profile, To efficiently solve the optimization problem, the decomposition meth both system-level and element-level was used. In addition, various techniques including efficient reanalysis technique intermediate variables and sensitivity analysis using an automatic differentiation(AD) were incorporated. Moreover the reamong section properties fitted to the section profile used in order to link the system level and the element level. From numerical investigation, it could be stated that the proposed method will lead to the more rational design compared with one.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.613-619
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• 2009

과거의 용수개발은 단위시설 또는 단위사업별 중심의 양적 확대개발 위주로 추진하여 수리시설간 수자원을 효율적으로 활용할 수 있는 용수공급체계가 미흡하였다. 수리시설의 양적 확대개발 위주의 추진결과 '03년도 총 수리시설수인 68,018개소 중 관개면적 50ha이상의 주 수원공은 1,888개소로서 전체수리시설의 2.8%를 차지하여 비합리적인 공급불균형 현상이 발생하여 체계적인 급수관리가 이루어지지 못하는 문제가 발생하였다. 또한 기존의 공급체계는 논 용수중심에서 식생활 변화로 인한 밭작물 수요증가로 용수이용 패턴이 변하고 있다. 더욱이 농촌지역의 생활환경 개선이 요구됨에 따라 생활용수, 공업용수, 환경용수 등 농촌지역에 과거와는 다른 형태의 용수수요가 발생하고 있다. 하지만 농촌지역의 수자원은 한정되어 있고 환경파괴 및 적지부족 등의 이유로 신규 수자원개발이 불가능한 사회여건이 지속되어 있어 많은 문제점이 나타나고 있어 균형적인 농촌발전과 건전한 농촌지역조성을 위해서는 새로운 대안이 제시되어야 하는 시점이다. 본 연구에서는 그 대안으로 부각되고 있는 농업용저수지 재개발에 대하여 사업의 우선순위를 합리적으로 결정할 수 있는 의사결정시스템의 개발을 목적으로 하고 있다. 기존 문헌을 고찰하면 개발우선순위는 과학적 논리보다는 정치적, 사회적 논리가 의사결정에 중요한 역할을 하였으나 의사결정시스템의 제공을 통해 정책결정자가 과학적이고 합리적인 논리에 따라 사업개발의 우선순위를 결정할 수 있을 것으로 기대한다. 본 연구에서는 재개발 의사결정에 필요한 지형적, 사회적, 환경적 요인을 지수화 하는 방법을 고찰하였고, 우선순위를 산정에 필요한 수치지도, 저수지 관련 자료의 작성과 지형정보(GIS)를 구축하였다. 우선순위 대상저수지의 선정은 기존문헌과 수계 및 용량 등을 고찰하여 79개로 우선 선별하였다.

• Korean Journal of Construction Engineering and Management
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• v.7 no.6
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• pp.141-150
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• 2006

As the law on the private sector investment in social infrastructure was amended in January of 2005, the government is aggressively promoting BTL projects but many trials and errors and problems are occurring. Especially, the Value-For-Money evaluation conducted by the responsible agencies to judge the appropriateness of the project found there was a conspicuous difference between the computed cost and the final contract sum. Accordingly, this study is aimed to grasp the problems in the current Value-For-Money evaluation and to improve it in order to proceed with BTL projects efficiently. To achieve this, through a relative comparison to the final contract sum, a clear standard for the items of Value-For-Money evaluation was presented and thus, a model that can ensure accuracy in computing the Value-For-Money was established so that a delay in negotiations can be avoided. If the Value-For-Money evaluation established in this study is used in assessing the appropriateness of unit prices for BTL projects for education facilities, a reasonable result can be expected to be drawn in selection and negotiations with contractors, and maintenance and Post-Operation-Evaluation(POE) of education facilities as well.

• Journal of Chest Surgery
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• v.29 no.8
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• pp.822-827
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• 1996

Ross procedure is an ideal operative modality for diseased aortic valve especially in children, but homogrart for right ventricular outflow tract(RVOT) reconstruction is not easily available in Korea. We tried to perform REV procedure for RVOT reconstruction in 10 young piglets(15.3 $\pm$ 1.3 kg) In an attempt to e clude the use of homograft in Ross operation. 3 of them survived after operation and raised till adult pig(about 70 kg), then examined their pulmonary arteries and hearts. Without any stenotic residues in the great arteries, we only found the deformed monocusp patch with severe calcification, which deprived the adequate valve function, but kept the pig growing normally We are sure that this operative modality (REV + Ross procedure) could be extendedly applied to the diseased human aortic valve, but we need to develope the anti-calcification method for the heterograft patch.

• Journal of the Korean Institute of Gas
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• v.24 no.5
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• pp.20-28
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• 2020

In this study, the damage impact range in the case of a hydrofluoric acid leak accident was predicted using formula calculation, impact assessment simulations, and CFD simulations, and the results were compared and analyzed with the actual environmental impact report. Formula calculation was performed by using the leak source model and diffusion model. Impact assessment simulation was performed by KORA provided by the Korean Ministry of Environment, ALOHA by the United States Ministry of Environment, and PHAST, which is relatively widely used among commercialization programs, and the STAD-CMM+program for CFD simulation. Was utilized. Considering convenience, speed, acceptability, and economics from the user's perspective, ALOHA and KORA were the most appropriate methods for predicting the impact of hydrofluoric acid leakage. In addition, the results of this study will help to reduce unnecessary regulations in the process of government policy development and optimize the investment in the safety field of the company, effectively utilizing the limited resources of the government and the company.

• Journal of the Korean School Mathematics Society
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• v.12 no.3
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• pp.319-345
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• 2009

Nowadays the researches on the reading materials about Mathematics are emphasized and quitely active. But most researches have just proposed the lists of books or materials of the reading activities in Mathematics. Therefore we choose the subject for this study as the analysis of the characteristic attitudes about Mathematics for 3-leveled (high, middle, low) high-school students who have studied Mathematics using the reading activities. After the applications of reading activities for leveled students, we have the following results. For the low-leveled students, the high-leveled(=difficult to understand) reading materials may loose the confidence and interest about Mathematics. The appropriate reading materials for leveled students will increase the interest and change the attitude about Mathematics. We expect that the reading activities in Mathematics extend the logical and rational thinking power that our society has required.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.3
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• pp.109-118
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• 2010

This study quantified the flood reduction effect of small stormwater detention facilities by the NRCS curve number. The modified rational equation was used to calculate the inflow volume into the detention facilities. The NRCS curve number in the cases w/ and w/o storage facility was calculated with respect to the rainfall characteristics(rainfall frequency, duration) and the size of storage facilities. Finally, diagrams showing the curve number reduction rate versus the size of storage facility were developed. The diagrams can be used to evaluate the flood reduction effect of storage facility reasonably and efficiently when estimating the optimal location and size of storage facility. The results based on the methodology propsed in this study were also compared with those of previous study for their validation.

• The Journal of the Korea Contents Association
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• v.16 no.5
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• pp.583-590
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• 2016

There are so many study on Heumheum Sinseo as a lawbook. But the study on Heumheum Sinseo as investigation and forensic manual is uncommon. So this study was performed to find the value of Heumheum Sinseo as investigation and forensic manual. In Heumheum Sinseo, we could find the basic ideology of a sense of justice on humanitarianism and rationalism, and democratic thoughts on criminal law such as the presumption of innocence, speedy investigation clause and Limiting the admissibility of the confession. And so many scientific method on crime investigation are described in Heumheum Sinseo. We expect that this study serve as moment for us to be able to find it have 'practical' value to us.