• 한국산학기술학회논문지
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• 제12권4호
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• pp.1962-1967
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• 2011

건설사업관리(CM)용역은 최근 10년간 매출규모와 서비스의 다양성에서 꾸준히 발전하여왔다. 그러나 한편으로는 상위 업체의 독점화 현상을 통하여 시장이 경직되고, 또한 건설사업관리 대가 수준의 미비하여 기대만큼 실효를 거두지 못하고 있다. 본 논문은 건설사업관리제도의 현황 분석을 통하여 보다 진보될 수 있는 개선방안을 제시하고자 하였다. 연구의 방법으로는 건설사업관리의 시장조사. 문헌조사, 현형 제도 분석. 대가수준 분석, 제안서 평가 및 입찰 제도 분석, 그리고 건설사업관리 종사 관련자들로부터 설문조사를 통하여 이루어졌다. 이러한 분석들을 통하여 건설 사업관리용역이 제도, 대가, 평가방식에서 개선되어야 할 사항들을 기술하였고 그것들을 통하여 건설사업관리 용역의 시장 확대와 공평한 경쟁, 그리고 정당한 서비스의 효과를 기대한다.

• 한국엔터테인먼트산업학회논문지
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• 제13권4호
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• pp.363-368
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• 2019

본 연구는 국민건강영양조사 자료를 이용하여 20세 이상 성인(n=9,409)에서 비만 및 복부비만과 CKD의 관련성을 평가하고자 실시하였다. 연구결과 CKD와 관련 있는 변수를 통제한 상태에서 남성의 경우 비만군[BMI ≥ 25.0kg/m², 1.83(95% CI, 1.20-2.80)]의 CKD의 OR값이 유의하게 높게 나타났으며, 여성에서는 복부비만군[WM ≥80cm, 1.52(95% CI, 1.52-2.28)]의 CKD의 OR값이 유의하게 높게 나타났다. 결론적으로, 여성에서는 복부비만 그리고 남성에서는 비만이 CKD의 발생률 증가와 관련이 있는 것으로 확인되었다.

• 한국건설관리학회논문집
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• 제12권5호
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• pp.81-92
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• 2011

위험형 CM(CM at Risk) 제도의 시행과 함께 토목시설물에도 CM계약사례가 증가할 것으로 예상되어, 국토해양부 등에서는 CM 업무지침을 공표하고 있다. 현재 공표된 CM 업무지침은 CM 계약 이후의 업무지침이지만, CM 발주사례가 부족한 토목사설을 포함한 공공사업에서는 CM 발주 자체에 필요한 CM발주의 가획단계부터 CM 업자 (Construction Manager, CMr) 선정까지의 업무지침이 필요한 실정이다. 따라서 본 연구에서는 발주처의 건설사업관리 발주업무를 발주 기획단계부터 CMr 선정단계까지 표준화된 프로세스 모형으로 구축하였으며, 이를 위해 CM발주 업무분류체계를 구성하였다. 또한 연구에서는 구축된 모형에 근거한 CM 발주지원 시스템을 개발하여 시스템의 실무 운영성을 검증하였다. 이러한 연구는 CM 발주사례가 부족한 발주처의 CM 발주업무 지원체계로 활용성을 가질 수 있다.

• 한국건설관리학회논문집
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• 제17권5호
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• pp.97-107
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• 2016

지난 18년간 우리나라 CM산업은 많은 발전을 이루어 왔으며, 최근 국내 건설투자가 감소하는 환경변화 속에서도 CM사업 고도화 및 해외시장에서의 기술과 경쟁우위를 통한 수주 확대를 위한 활발한 노력이 이루어지고 있다. 이에 본 연구는, 1997년부터 2014년까지의 3,453건의 CM사업 수주실적 통계자료를 수주지역, 계약규모, 발주자유형, 공종유형의 4가지 분석변수를 통해 연도별 시간별 시계열 분석을 하였다. 분석결과, 우리나라 CM산업의 시장규모는 최근 2005년 대비 2010년 2.5배 증가하였으며, 국내 CM사업의 수주비중이 87.5%, 공종별로는 건축분야가 88.4%, 계약규모별로는 10억미만의 CM사업이 75%로 CM수주 집중도가 높았다. 그러나 최근 국내 CM기업의 향상된 기술 및 수주경쟁력으로 인해, 2010~2014년 해외 CM사업 비중이 20%까지 크게 증가하였으며, 포괄적이며 기술적인 사업관리업무를 요구하는 민간발주자에 의한 CM사업도 3배나 증가하였다. 이와 같은, CM산업환경 및 사업유형의 변화는 향후 해외민간(IC5) CM사업 수주확대로의 발전경로(Jung et al. 2014)에 놓인 DP3와 DC2의 정량적 분석을 통해서도, 공공사업 부분용역형 CM사업 중심에서 생애주기를 고려한 종합관리형 민간사업 형태로 발전되고 있는 것으로 분석되었다.

• 한국의류산업학회지
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• 제6권1호
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• pp.109-113
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• 2004

The present study attempted to consider the effects of cutting lines in the knee parts of slacks on the clothing pressure and comfort. The study compared and analyzed the pressure imposed to the body in a stooping position and the consequent sensations felt by the wearer according to the slack shapes. The conclusion was drawn as follows: The pressure imposed by the slacks to the body is greater on the two points slightly upper and lower from the knee point than on the knee point itself, regardless of the slack shapes. Clothing pressure was lower in the slacks with 10 cm-wide and 14 cm-wide cutting lines in the knee parts than those with 18 cm-wide cutting lines. Subjective sensations felt in the knee parts were analyzed according to slacks shapes. As a result, it was found that slacks without cutting lines on the knee parts or with sewing lines far from the knee points were more comfortable. In slacks construction, the use of cutting lines in the knee parts can decrease pressure imposed to the knee area or improve the comfort of the slacks. When designing slacks, however, overall appearance should be considered and the weakness of cutting line that makes legs look shorter should also be complemented.

• International Journal of Air-Conditioning and Refrigeration
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• 제15권3호
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• pp.122-128
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• 2007

Heat transfer distributions and friction factors in square channels (3.0 ${\times}$ 3.0 cm) with twisted tape inserts and with twisted tape inserts plus interrupted ribs are respectively investigated. The rib height-to-channel hydraulic diameter ratio, $e/D_h$, is kept at 0.067 and test section length-to-hydraulic diameter ratio, $L/D_h$ is 30. The square ribs are arranged to follow the trace of the twisted tape and along the flow direction defined as axial interrupted ribs. The twisted tape is 0.1 mm thick carbon steel sheet with diameter of 2.8 cm, length of 90 cm, and 2.5 turns. Two heating conditions are investigated for test channels with twisted tape inserts and rib turbulators: (1) electric heat uniformly applied to four side walls of the square duct, and (2) electric heat uniformly applied to two opposite ribbed walls of the square channel. Results show that the twisted tape with interrupted ribs provides a higher overall heat transfer performance over the twisted tape with no ribs.

• 한국산업융합학회 논문집
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• 제6권2호
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• pp.115-122
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• 2003

This experimental study on high strength lightweight concrete using compound materials has been performed. In which, expanded clay was used as coarse aggregate, and silica fume and fly ash as admixtures varying by 0, 10% and 0, 5, 10, 15, 20% of cement amount respectively were added. Thus, the properties of fresh and hardened concrete have been investigated. The results of this study can be summarized as follows ; Each slump loss of mixtures replaced fly ash has been decreased by increasing replacement rate. The compressive strength have shown 465, 428 and $401kgf/cm^2$ at 30, 40 and 50% of W/B in 28days respectively, all of which have satisfied the criterion $270kgf/cm^2$ of high strength lightweight concrete. The unit volume weight of hardened concrete has been decreased by increasing replacement rate of silica fume and fly ash, values of which have satisfied the criterion $2000kgf/cm^3$of light weight concrete.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2008년도 추계 공동 국제학술대회
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• pp.629-633
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• 2008

Recently, there has been great interest in the application of short-range wireless communication system. In this paper, the miniaturized FM transmitter with low power is developed, and laboratory tests have been carried out. The FM transmitter uses FM radio waves to send sound from any system (MP3, PMP, PDA, MP3 Phone et.) to any nearby radio or stereo system. The transmitter is designed with $2.6cm{\times}2.6cm{\times}2.6cm$ system size. The operating voltage is 3.7 V and used the built-in storage battery. The system can use continuously during 7 hour with once charging. The transmission frequency can select one of 88.1 MHz, 88.3 MHz, or 88.5 MHz in compliance with utility condition. The channel separation ability is 40 dB. The operating temperature is $-10{\sim}+85^{\circ}C$, which use in the industry environment. Consequently, this system sis used conveniently with short distance information transmitter system at the industry field.

• 펄프종이기술
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• 제35권4호
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• pp.68-74
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• 2003

Kenaf(Hibiscus cannabinus L.) cultivar, Tainung 2, had been grown for 152 days at the experimental farm of Jinju National University, Gajoa-dong, Jinju-si, Kyongnam, Korea. The planting, growth rate, fertilization and structural characteristics as well as the cultivation and growth characteristics of kenaf, and the product usage were investigated. The narrowest diameter at kenaf bottom was 10 mm, the widest 42 mm and the average about 28 mm, and the shortest height 150 cm, the tallest 480 cm and the average about 350 cm. The weight of a core fraction was 68.1％ and a bast fraction 31.9％. The weight ratio of core material to bast fiber was 2.31. The weight ratio of dry stem was 73.5％ and that of leaves 26.5％. The weight of dry plant produced in 1 $m^2$ was 1,467 g, and about 1,052 g of stem could be used for the commercial purpose, The application of fertilizers resulted in the increase of the growth rate of the diameter at plant bottom and the height. Bast fiber, phloem ray and cortex parenchyma cell were observed in bast, and vessel, wood fiber and ray in core.

• 방사성폐기물학회지
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• 제20권1호
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• pp.99-110
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• 2022

In decommissioning a nuclear power plant, numerous concrete structures need to be demolished and decontaminated. Although concrete decontamination technologies have been developed globally, concrete cutting remains problematic due to the secondary waste production and dispersion risk from concrete scabbling. To minimize workers' radiation exposure and secondary waste in dismantling and decontaminating concrete structures, the following conceptual designs were developed. A micro-blast type scabbling technology using explosive materials and a multi-dimensional contamination measurement and artificial intelligence (AI) mapping technology capable of identifying the contamination status of concrete surfaces. Trials revealed that this technology has several merits, including nuclide identification of more than 5 nuclides, radioactivity measurement capability of 0.1-10⁷ Bq·g^-1, 1.5 kg robot weight for easy handling, 10 cm robot self-running capability, 100% detonator performance, decontamination factor (DF) of 100 and 8,000 cm²·hr^-1 decontamination speed, better than that of TWI (7,500 cm²·hr^-1). Hence, the micro-blast type scabbling technology is a suitable method for concrete decontamination. As the Korean explosives industry is well developed and robot and mapping systems are supported by government research and development, this scabbling technology can efficiently aid the Korean decommissioning industry.