• 월간 기계설비
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• s.258
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• pp.52-57
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• 2012

건설산업공생발전위원회가 지난해 10월 출범했다. 국토해양부장관을 필두로 주요 발주기관장과 종합 전문 설비협회 단체장, 민간전문가 등이 대거 참여한 위원회가 건설산업의 당면과제를 논의하기 시작한 것이다. 그동안 상생협력 및 동반성장을 지원하기 위한 제도 개선이 지속적으로 이뤄져 왔지만 이번 공생발전위원회는 건설산업 공통의 과제와 미래 발전방안을 민 관이 함께 모색한다는 점에서 향후 적지 않은 성과가 기대된다. 공생발전위는 크게 ${\bigtriangleup}$건설문화 개선 및 이미지 제고 ${\bigtriangleup}$건설산업 참여주체 간 공생발전 정착 ${\bigtriangleup}$건설산업의 경쟁력 제고 등 3가지 대주제를 제시해 놓고 있다. 이 위원회에 정해돈 대한설비건설협회 회장이 설비건설업계 대표로 참석하여 기계설비업계의 당면문제를 건의하고 있다. 이에 따라 지난해 12월 23일 열린 제3차 회의에서는 그동안 대한설비건설협회가 지속적으로 건의한 저가하도급 심사제도 개선, 하도급 계약 시 부당특약 근절방안, 산재은폐 제도개선 등의 논의가 본격화 되었다. 이처럼 설비건설업계는 공생위원회가 저가하도급 유도 및 불공정 하도급 관행 등을 개선해 줄 것으로 기대하고 있다. 즉, 하도급업계가 피부로 느낄 수 있는 진정한 공생발전이 이루어지기를 기대하고 있는 것이다.

• 월간 기계설비
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• s.318
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• pp.54-55
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• 2017

장기계속건설공사에 있어 수급사업자에 대한 원사업자의 계약이행보증금 중도반환 규정이 신설됐다. 이에 따라, 연차별로 계약의 이행을 완료한 원사업자는 국가 등 공공발주자로부터 계약보증금을 반환받을 수 있는 날부터 30일 이내에 수급사업자에게 연차별 하도급계약이행보증금을 중도에 반환해야 한다.

• 월간 기계설비
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• s.241
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• pp.55-62
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• 2010

건설업체가 불법 부당 행위로 법을 위반할 경우 행정처벌이 무겁고 엄격하다. 때문에 건설 실무자들은 반드시 건설업 벌칙규정을 명확하게 숙지하고 있어야 한다. 본지는 이번호부터 일선 현장 및 사업 영위에 필요한 건설업 벌칙규정을 알기 쉽게 편집해 소개한다. 이번 호에 게재되는 하도급거래공정화에 관한 벌칙중 $\blacksquare$부분은 새로 개정된 것으로, 회원사의 건설 실무에 많은 참고 바란다.

• 월간 기계설비
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• s.310
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• pp.106-107
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• 2016

공정거래위원회의 불공정 하도급거래 제재 무게 중심이 대금 지연이자 수수료 미지급, 부당특약 설정 등에서 추가공사, 설계변경에 따른 대금 지급 여부로 확대되고 있다. 공사물량이 추가 변경됐는데도 수급사업자에 변경 계약서를 발급하지 않고 대금을 제대로 주지 않는 행위들이 여전히 제재 사각지대에 놓여 있다는 판단에서다.

• 월간 기계설비
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• s.242
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• pp.56-60
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• 2010

건설업체가 불법 부당 행위로 법을 위반할 경우 행정처벌이 무겁고 엄격하다. 때문에 건설 실무자들은 반드시 건설업 벌칙규정을 명확하게 숙지하고 있어야 한다. 본지는 지난 6월호부터 일선 현장 및 사업 영위에 필요한 건설업 벌칙규정을 소개하고 있다. 이번 호에 게재되는 하도급거래공정화에 관한 벌칙 중 $\blacksquare$ 부분은 새로 개정된 것이다. 회원사의 건설 실무에 많은 참고 바란다.

• Journal of Korea Water Resources Association
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• v.46 no.9
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• pp.909-919
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• 2013

This study examines the hydraulic characteristics, the channel changes, the behavior of bars, and bank stability by means of laboratory experiments. Three sets of laboratory experiments are conducted to elucidate the influence of riparian vegetation of the channels with erodible banks. Flow velocity is decreased in the vegetated zone, the mobility of lower channels is decreased. The double Fourier analysis of the bed waves shows that 1-1 mode (alternate bar) is dominant at the initial stage of the channel development. As time increases, 2-2 and 2-3 modes (central or multiple bars) are dominant due to the increased width to depth ratio. As the vegetation density is increased, the number of bars are increased, bank stability increases. The variation of sediment discharges is affected by vegetation density. The braided intensity is decreased with vegetation density. As the vegetation density is increased, the correlation coefficient of bed topography and bed relief index is increased.

• Journal of Korea Water Resources Association
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• v.48 no.11
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• pp.879-889
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• 2015

The pattern of headward erosion at tributary and the separation zone formation in a loosed bed at confluence according to the confluence angle, discharge ratio, and dredging depth ratio have been analyzed. The separation zone is defined the inside of zero velocity boundary at downstream of confluence. The limit of separation zone occurrence is presented with dredging depth ratio. The propagation length of knickpoint increases as the confluence angle, discharge ratio, and dredging depth ratio increase in general and its regression equation has been suggested. The length and width ratios of separation zone in a loosed bed increase as discharge ratio and confluence angle increase as well as in a fixed bed. The length ratio decreases and the width ratio increases as dredging depth ratio increases results in great increase of shape factor and backwater rise by the conveyance reduction at confluence. The regression equation of shape factor with confluence angle, discharge ratio, and dredging depth ratio has been suggested.

• Korean Journal of Ecology and Environment
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• v.51 no.4
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• pp.311-321
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• 2018

The purpose of this study is to investigate effect of stream channel naturalness on ecological health by using environmental factors and Fish Assessment Index (FAI) in the Han River of South Korea. These samples and data have been released from the research project titled Stream/River Ecosystem Survey and Health Assessment, which was conducted in 444 sites in the Han river watershed from 2008 to 2016. All samples were classified into five groups according to a degree of morphological changes of stream. Water chemistry analyses indicated a decline in water quality by decreasing stream channel naturalness, it is assumed that channelized stream was vulnerable to aquatic pollution compared to the natural meandering stream. In the result of frequency of dominant species, sensitive species and insectivore such as Zacco koreanus, Rhynchocypris kumgangensis and Pungtungia herzi were frequently dominated in the natural meandering stream while tolerant species and omnivores such as Carassius auratus and Cyprinus carpio were more dominated in the channelized streams. The FAI in the channelized stream shows decline to average of $46{\pm}25$ compared with that of the natural meandering stream ($80{\pm}20$). The decrease in FAI was highly influenced by changes in matrixes of fish assemblage structure such as number of sensitive species (M3), portion of omnivores (M5) and insectivores (M6). Moreover, annual average FAIs from 2008 to 2016 were significantly correlated with water chemistry, especially TN, TP and BOD ($r^2=0.59$, p<0.0001). Taken together, all the results suggest that the stream channelization could negatively impact on the water quality and fish assemblage structure, leading to degradation in aquatic ecosystem health.

• Korean Journal of Construction Engineering and Management
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• v.4 no.2 s.14
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• pp.74-81
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• 2003

In the construction industry, projects are becoming increasingly large and complex, involving multiple subcontractors. Traditional centralized coordination techniques used by the general contractors become less effective as subcontractors perform most wok and provide their own resources. When subcontractors cannot provide enough resources, they hinder their own performance as well as that of other subconractors and ultimately the entire project Thus, construction projects need a new distributed coordination approach wherein all of the concerned subcontractors can reschedule a project dynamically. To enable the distributed coordination framework of project schedule changes, the author developed an agent-based compensatory negotiation methodology, which allows intelligent software agents to simulate negotiations on behalf of their human subcontractors. In addition to this theoretical work, 1 designed and implemented a prototype to demonstrate the effectiveness of the framework. Thus, this research formalizes the necessary steps that would help construction project participants to increase the efficiency of their resource use, which in turn will enhance successful completions of whole projects.

• Journal of Korea Water Resources Association
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• v.46 no.5
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• pp.449-463
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• 2013

This study proposes the method for determining the Muskingum channel routing model parameters based on the assumption of linear system. The proposed method was applied to the Chungju dam basin for the evaluation. Additionally, the rainfall-runoff was repeated for the Yeongchun-Chungju dam reach using seven rainfall events observed. Summarizing the results is as follows. First, the concentration time and storage coefficient of a channel reach formed by the subdivision can be expressed as the difference between the concentration times and storage coefficients of upstream and downstream basins. The storage coefficients of the channel reach estimated is equal to the storage coefficient of the Muskingum channel routing model and the weight factor can be simply estimated using the ratio between the concentration time and storage coefficient. Second, the weight factor of the Muskingum model is in inverse proportion to the Russel coefficient, which is in between 0.4166 and 0.625 when considering the Russel coefficients generally applied. Finally the application to the Yeongchun-Chungju dam reach showed that the proposed method is still valid regardless of the limitations such as the uncertainty of the observed data.