• Construction Engineering and Management
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• v.5 no.5 s.21
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• pp.8-9
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• 2004

• 보일러설비
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• s.69
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• pp.84-86
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• 1999

• 보일러설비
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• s.67
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• pp.107-110
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• 1999

• 보일러설비
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• s.68
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• pp.83-86
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• 1999

• Construction Engineering and Management
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• v.1 no.4 s.4
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• pp.46-49
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• 2000

• Korean Journal of Construction Engineering and Management
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• v.13 no.3
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• pp.89-98
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• 2012

The growth of CM(construction management) market poses business opportunities and challenges to improve vocational ethics of CM professionals and firms. Ensuring the vocational ethics of CM professionals is an important issue not only for individual CM professional but also CM firms and CM industry in general. The objective of the study is to investigate relationships between the importance and performance of CM professionals' vocational ethics and discuss key characteristics and implications. The IPA(Importance-Performance Analysis) technique is used as a research tool. Findings show that quality CM service and competencies are the core of CM professionals' vocational ethics. But there exists a gap between importance and performance of CM professionals' vocational ethics.

• Clean Technology
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• v.25 no.3
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• pp.179-188
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• 2019

Upon the combustion of coal particles in a coal-fired power plant, fly ash (80%) and bottom ash (20%) are unavoidably produced. Most of the ashes are, however, just dumped onto a landfill site. When the landfill site that takes the fly ash and bottom ash is saturated, further operation of the coal-fired power plant might be discontinued unless a new alternative landfill site is prepared. In this study, wet flotation separation system (floating process) was employed in order to recover unburned carbon (UC), ceramic microsphere (CM) and cleaned ash (CA), all of which serving as useful components within fly ash. The average recovered fractions of UC, CM, and CA from fly ash were 92.10, 75.75, and 69.71, respectively, while the recovered fractions of UC were higher than those of CM and CA by 16% and 22%, respectively. The combustible component (CC) within the recovered UC possessed a weight percentage as high as 52.54wt%, whereas the burning heat of UC was estimated to be $4,232kcal\;kg^{-1}$. As more carbon-containing UC is recovered from fly ash, UC is expected to be used successfully as an industrial fuel. Owing to the effects of pH, more efficient chemical separations of CM and CA, rather than UC, were obtained. The average $SiO_2$ contents within the separated CM and CA had a value of 53.55wt% and 78.66wt%, respectively, which is indicative of their plausible future application as industrial materials in many fields.

• Journal of the Korean Society of Industry Convergence
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• v.4 no.1
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• pp.77-85
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• 2001

This paper was to investigate the preparation of polysulfone(PS), polyethersulfone(PES) and polyphenylsulfone(PPS) membrane. The thermal property of PPS was higher than that of others. From the result of SEM, the concentration of polymer was found to have a significant effect on the structure of membrane, and the structure of membrane made of PES is found to have regular micell form of asymmetry. Permeability and selectivity for oxygen and nitrogen gas in the air were analyzed by GC. Permeabilities of the membrane made of PES for oxygen and nitrogen in air, 1.5 and $0.7(x10^9[cm^3(STP)cm/cm^2seccmHg]) $, respectively was higher than that of others. and Selectivity of the membrane made of PPS for oxygen to nitrogen gas in air was 2.9.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.213-218
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• 2002

건설산업의 경쟁력 제고를 위해 건설산업에서 기획${\cdot}$설계${\cdot}$시공${\cdot}$사후관리단계에서 엔지니어링분야에 대한 고도의 기술력과 함께 이들을 총체적으로 관리할 수 있는 사업관리능력의 향상이 매우 중요하다. 최근 SOC사업이 대형화, 복잡화됨에 따라 전문 기술과 경험을 보유한 전문 건설사업관리 인력이 필요하고, 대형 사업의 사업관리수행방법의 형태가 발주 직영에서 사업관리 대리인인 CMr 체계로 바뀌어 가고 있다. 이와 같은 배경아래 대형 민자유치사업의 성공적인 수행을 위해서는 통합 CM/PM능력을 구비한 전략적 건설수행체제 구축이 필요하며, 이를 통해 사업비의 감소와 공기단축을 이루어 궁극적으로는 국내 건설업체의 경쟁력강화와 전문화/특화화를 이룰 수 있을 것이다. 이를 위해 본고에서는 민자사업에서의 CM의 역활을 중점적으로 논하고져 한다.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2002.11a
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• pp.208-212
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• 2002

난간대가 사용되는 곳은 건설현장, 건물 외에도 제조현장, 제조공장 등 사람이 가는 곳, 작업자가 통과하는 곳에는 어디서나 존재한다고 보면 될 것이다. 산업안전보건법의 안전기준 제27조에서는 사업주는 4단 이상의 계단에 개방된 측면에는 난간을 설치하고 다음 각 호의 조치를 하여야 한다 1) 난간의 높이는 90cm 이상이 되도록 할 것 2) 난간은 계단참을 포함하여 각 층의 계단 전체에 걸쳐서 설치 할 것. 3) 목재로 된 난간은 5제곱cm 이상의 단면을 금속제 파이프로 된 난간을 4cm 이상의 지름을 갖는 것일 것. 4) 난간은 임의의 점에 있어서 임의의 방향으로 움직이는 100kg 이상의 하중에 견딜 수 있는 튼튼한 구조로 할 것 5) 난간의 지주는 2m 이내마다 설치하고 가능한 한 단면과 난간 상면과의 중앙부에 중간대를 설치할 것으로 규정하고 있다. 상기 사항에서 3)항은 구조적으로 중요한 요소로서 외부하중에 대한 내력상의 문제가 있을 것으로 판단되어 이에 대한 실험규명이 필요하게 되었고 본 연구의 목적이 되었다.