• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.6D
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• pp.697-705
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• 2010

The purpose of this research is to clarify the relation between environmental consciousness and railway usage behavior. Author would locate this research on position of basic survey to promote railway use according to Low Carbon Green Growth policy in Korea. In this research, we would perform descriptive analysis using data of research on the actual condition of railway use in 2008, Daegu, and describe its relationship. In addition, we would suggest some idea about policy which can promote railway use. The order of railway choice behavior noticed in clustering of environmental consciousness was cooperative behavior type, middle type and non-cooperative behavior type. It suggests that environmental consciousness has effect on transportation choice behavior. Specially, railway improvement isn't enough to promote railway use. And, it is advisable to carry out the improvement in such a way that it may encourage the nation to move from the current environmental consciousness stage to cooperative behavior. Moreover, we assumed Binary Probit(BP) model using SP data of time or condition of transportation expense compared with passenger car and bus. As the results, modified likelihood ratio of two BP models is favorable variables. And it occurred that mode was transferred from passenger car to railway when it showed higher social environment consciousness and low selfish environment consciousness, because t-statistic which represents selfish environment consciousness showed significance in 95% confidence level. That is, it can be described that environment consciousness affect on the intention of railway use.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.6D
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• pp.849-857
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• 2008

Technology roadmapping is one of the widely used technology planning methodologies. Using a technology roadmap, the researchers can increase the possibility of the project success by systematic management of research contents, budgets, and commercialization strategies. Currently, Ministry of Land, Transport and Maritime Affairs has a plan to increase the research fund to improve the construction industry. As a result, the number of long term research projects with more than five years of research period, is increasing. This entails the need for a methodology for the systematic planning and management of research. However, the construction industry has the characteristics that the research results should ultimately be implemented in an outdoor environment. Through processes of diverse literature reviews, questionnaire-based survey, and pilot research, this paper presents a systematic procedure for the development of construction technology roadmaps, which can consider the unique nature of the construction industry. Based on the procedure, a technology roadmap for intelligent construction monitoring is also developed.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.4A
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• pp.565-571
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• 2008

Recently, the evaluation technique using NDT (Nondestructive Technique : NDT) is widely utilized because it makes little damage on RC (Reinforced Concrete : RC) structures. The techniques using electromagnetic properties (EM properties) are also attempted for the evaluation of the performance of concrete which is nonmetallic. For the economic manufacturing of concrete material, sea-sand is often used as aggregate, however, chloride ion in concrete has direct effects on steel corrosion and EM properties. In this study, OPC mortar specimens with 5 different chloride amount (0.0, 0.6, 1.2, 2.4, and $3.6kg/m^3$) and 3 different water-cement ratios (45%, 55%, and 65%) are prepared in order to investigate the EM properties corresponding to concrete properties. The EM properties of conductivity and dielectric constant are measured in the frequency range over 0.2~20 GHz. To facilitate the comparison of EM properties with chloride content, average values are taken respectively for the conductivity and dielectric constant measured over the 5~20 GHz frequency range. According to the results of this experiment, dielectric constant and conductivity are increased with lower W/C ratio and larger amount of chloride content.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.3D
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• pp.399-408
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• 2009

The major changes in construction environment are that construction project is bigger and more complicated and the power of construction market changes from the supplier to the client or the user. Especially public construction enterprises have advanced to introduce the value engineering (VE) which is one of the cost management based on the owner's leading at the design phase for economical efficiency and quality improvement. According to the these efforts, the implementation of VE was legislated in the revised Construction Technology Management Act in 2000, governmental agencies, local autonomies, and construction public enterprises universally has taken the VE into consideration. In this circumstance, the scope that VE construction applied at 50 billion won projects from 2003 has been extended to 10 billion won projects in 2006. Therefore, the VE construction will be activated in the future. The cost savings and function improvement, which are the purpose of VE are not only construction public enterprises, but also every public client supported from government's budget or owned by the government. Therefore, the purpose of this study is to propose the improved process and performance index of VE for governmental agencies, local autonomies, and construction public enterprises which want to introduce or improve the VE process. This research also suggested the To-be design-phased VE process model. In addition, it suggested the To-be model of design management reflected the To-be design-phased VE process model, which is eliminated two problems reflected for the performance improvement of the As-is model of design management.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.405-408
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• 2008

This study, as mock-up test for applying Polylon Fiber engineering method to the field, analyzed the fundamental characteristics and the fireproof characteristics of high strength concrete mixed with Polylon Fiber 0.05% and the results are summarized as followings. From the characteristic of the fresh concrete, both slump flow and air content were appeared to satisfy target range. And from the characteristic of hardened concrete, all compressive strengths according to the curing conditions were appeared to satisfy design standard strength of 60 MPa. From the fireproof characteristic, small scaling and spalling phenomenon were partially appeared on the surface part of specimens, but generally the excellent fireproof capacities were appeared. From the characteristic of temperature hysteresis, the highest temperature and the average temperature of reinforcing part after fire-resistant test for 3 hours were $531^{\circ}C$ and $405{\circ}C$, respectively and then satisfied fireproof standard of the Ministry of Land Transportation and Maritime Affairs.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2009.04a
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• pp.229-232
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• 2009

최근 들어 소득과 교육 수준의 향상으로 인하여 생활환경과 여가시간 그리고 건강에 대한 관심이 높아지면서 U-City와 지속 가능한 생태 도시에 대한 사람들의 관심이 증가되고 있다. 이러한 삶의 질 향상에 따라 최근 국토 해양부에서는 U-City에 더불어 지속 가능한 생태계 순환기능과 첨단 IT기술이 결합된 U-Eco City에 대한 연구가 진행되고 있다. U-Eco City는 첨단의 IT기술을 집대성한 유비쿼터스 기술과 생태계 순환기능 등의 생태 기술이 인간, 자연 그리고 공간으로 연결되는 혁신적이고 창의적인 도시환경과 무한한 도시가치를 창출하는 지속가능한 미래형 첨단 친환경 생태도시를 말한다. U-Eco City는 보다나은 생활환경을 추구하고자 하는 인간의 욕구를 충족시킬 수 있는 미래형 지속가능한 생태환경 도시로서 많은 연구가 이루어지고 있다. 특히 미국과 영국에서는 활발한 연구가 이루어지고 있다. U-Eco City는 더 나은 삶을 향한 인간의 끝임 없는 욕구 충족을 위해서 지속적인 연구가 필요하다. 하지만 아직은 U-Eco City를 도시 브랜드화 하기 위한 체계적인 연구가 미비한 상황이며, 특히 U-Eco City를 도시 브랜드화 하기위한 필수적인 단계인 인증과 관련된 부문에 연구가 많이 이루어지지 않고 있다. 따라서 현재 통용되는 인증 제도를 통한 체계적인 제도의 정립, 인증 기준의 마련뿐만 아니라 인증을 위한 세부 지침의 마련 등이 필요하다. 따라서, 본 연구에서는 U-Eco City 개발 기발 요소 기술들을 기존의 인증기관을 통해 인정을 받을 수 방법들을 제시하고, 그 외의 요소기술들은 인증 기준을 제시하고, 인증기관을 인정하기 위하여 세부기준을 마련하도록 하였다, 다음은 신기술, 신제품 등, 인증을 받을 수 있는 제도적, 법적, 절차를 제시하였다. 본 연구는 인증제도를 통하여 U-Eco City를 도시 브랜드화를 하여 국내외 시장에 공급하고, 향후 개발될 U-Eco 기술인증업무를 지속적으로 수행하도록 하는데 그 목적이 있다.

• Proceedings of the KAIS Fall Conference
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• 2011.05a
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• pp.122-125
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• 2011

본 연구에서는 기존 교육시설에 설치된 알루미늄 합금 창의 2차원 정상상태 전열해석을 통한 열성능 평가를 수행하였다. 교육시설의 주요 창호재료로 적용된 알루미늄은 열전도율이 $175 \;Kcal/m^2h^{\circ}C$ 정도로 플라스틱 소재와 비교하여 매우 불리하여 기존 시설에 설치된 알루미늄 창호는 열손실의 주요인으로 지적되고 있다. 본 연구에서는 이러한 점에 착안하여 충남 서산지방에 위치한 대학건물의 알루미늄 합금 창호의 열성능 평가에 관한 연구를 수행하여 다음과 같은 해석 결과를 도출하였다. (1) 2차원 정상상태 전열해석을 위한 경계조건은 국토해양부고시 건축물의 에너지절약설계기준의 [별표 6] 중부지방 냉난방장치의 용량계산을 위한 설계 외기온 기준과 [별표 7]의 실내온도 기준을 적용하여 여름철 실내 $27^{\circ}C$, 실외 $31.3^{\circ}C$, 겨울철 실내 $21.0^{\circ}C$, 실외 $-9.6^{\circ}C$ 로 설정하고 해석한 결과 열관류율은 알루미늄 합금 창호는 $U=9.631 \;W/m^2K$, 복층유리 $U= 2.382 \;W/m^2K$로 여름철과 겨울철 동일한 해석결과치가 산출되었다. (2) 산출된 열관류율 해석결과를 건축물의 에너지절약설계기준 [별표 3] 열교차단재가 적용되지 않은 금속제 창의 단열성능 중 일반복층창 성능기준인 $4.0 \;W/m^2K$와 비교할 때, 알루미늄 창틀을 통하여 225%의 열량이 손실됨을 보여 주고 있다.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.250-250
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• 2017

글로벌 위성 기반의 강수량 관측에 대한 역사는 1979년에 Arkin의 의해 제안된 IR방법에 의해 위성으로부터 강우자료를 유도하는 개념이 도입된 이후 1987년 해양에서의 비교적 정확한 강수량 추정이 가능한 다중 채널의 마이크로파(MW) 복사계를 이용한 방법으로 위성강수 추정에 대한 연구가 활발히 진행되었다. 이후 두 IR과 MW를 혼합한 방법에서, 또다시 1997년 TRMM위성의 PR(Precpipitation Radar)의 레이더를 이용하는 방법, 그리고 2014년 GPM 핵심 위성(GPM Core Observatory)에 탑재된 Dual PR에 의한 방법으로 위성강수의 정확도를 매우 높여가고 있다. 본 연구는 KOICA 사업으로 진행중인 모로코 세부강 유역 홍수방지 마스터플랜 사업에서 모로코 세부강 유역의 2010년 홍수사상에 대한 위성강우 및 지상계측 일일자료를 이용하여 홍수유출량을 추정하는 것으로 목적으로 하고 있다. 모로코 세부강(Oued Sebou) 유역은 모로코의 서북부에 위치하며 유역면적은 한강유역과 유사한 $38,380km^2$이고 하천연장은 450km로 모로코 국토면적의 약 7% 정도를 차지하며 모로코 농업생산의 중심지역이고 유역의 기후 및 기상 특성은 겨울철 온난다습하고 여름에 고온 건조한 지중해성 기후를 나타내며, 연강수량은 400mm이상으로 보고하고 있다(이산 등, 2015). 유역내 49개 관측소의 일일 강우량 자료를 분석한 결과 2000년부터 2010년까지의 유역 산술평균 강수량은 607.1mm/yr로 분석되었고, 2010년 가장 많은 강수를 기록한 지역은 Jbel oudka로 1874.1mm/yr였고, 가장 적은 강수량을 기록한 지역은 Allal Al Fassi - Barrage로 289.9mm/yr로 나타났다. 2010년 홍수가 발생한 시기인 2009년 12월 19일부터 2010년 1월 18일까지의 1시간 간격의 위성강우자료와 1일 관측 지상계측자료를 합성하여 위성보정강우량을 추정하였다. 보정 방법은 순위상관방법을 적용하였다. 사용한 모형은 일본 ICHARM에서 개발한 IFAS와 한국건설기술연구원의 MapWindow 기반 GRM 모형(mwGRM)을 이용하였다. 모형의 적용 결과 세부강 유역 본류의 첨두유출량은 $6,010m^3/s$(mwGRM)과 $5,878m^3/s$(IFAS)로 분석되었다. 향후 위성강우 및 지상계측 강우의 시계열적 정확도와 총강우량 등의 정확도 평가를 수행할 계획이다.

• Journal of the Korean Geotechnical Society
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• v.22 no.6
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• pp.51-61
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• 2006

An efficient and accurate hybrid reliability analysis method is proposed in this paper to quantify the risk of an axially loaded single pile considering pile-soil interaction behavior and uncertainties in various design variables. The proposed method intelligently integrates the concepts of the response surface method, the finite difference method, the first-order reliability method, and the iterative linear interpolation scheme. The load transfer method is incorporated into the finite difference method for the deterministic analysis of a single pile-soil system. The uncertainties associated with load conditions, material and section properties of a pile and soil properties are explicitly considered. The risk corresponding to both serviceability limit state and strength limit state of the pile and soil is estimated. Applicability, accuracy and efficiency of the proposed method in the safety assessment of a realistic pile-soil system subjected to axial loads are verified by comparing it with the results of the Monte Carlo simulation technique.

• Journal of Korean Society for Geospatial Information Science
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• v.17 no.3
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• pp.23-31
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• 2009

The border of the shorelines in a nation is an important factor in determining the border of a national territory, but Korea's shorelines are rapidly changing due to the recent rise in sea level from global warming and growth-centered economic policy over the decades of years. This research was done centering on the areas having well-preserved shorelines as they naturally are and other areas having damaged shorelines in their vicinities due to artificial structures at the two beaches located at the neighboring areas and having mutually homogeneous ocean conditions with each other. First, this research derived the shorelines using the aerial photographies taken from 1947 until 2007 and revised the tidal levels sounding data obtained from a hydrographical survey automation system consisting of Echosounder[Echotrac 3100] and Differential Global Positioning System[Beacon]by using topographical data and ships on land obtained by applying post-processing Kinematic GPS measuring method. In addition, this research evaluated the changes and dimensional variations for the last 60 years by dividing these determined shorelines into 5 sections. As a result, the Haewundae Beach showed a total of 29% decrease rate in dimension as of the year 2007 in comparison with the year 1947 due to a rapid dimensional decline centering on its west areas, while the dimension of the Gwanganri Beach showed an increase in its dimension amounting to a total of 69% due to the decrease in flow velocity by artificial structures built on both ends of the beach-forming accumulation; thus, it was found that there existed a big difference in deposition & accumulation tendency depending on neighboring environment in spite of the homogeneous ocean conditions.