• 월간 기계설비
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• no.2 s.199
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• pp.52-55
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• 2007

2007년 상반기 적용 건설업 임금실태조사(시중노임단가) 결과가 1월 1일자로 공포되어 적용에 들어갔다. 2006년 하반기 건설업 임금의 일일 평균임금은 9만6,343원에 비해 각각 1.7%, 3.6/% 상승한 것으로 나타났다. 건설 관련 145개 직종 중 104개 일반공사 직종의 평균임금은 전체 직종의 전반기 대비 상승률보다 0.1%포인트 낮은 1.6%였고, 특히 형틀목공, 철근공, 보통 인부 등 주요 15개 직종은 전체 직종 평균치를 웃도는 2.6% 상승함으로써 전체 임금상승을 이끌었다. 대한건설협회는 매년 상·하반기 2차례에 걸쳐 건설업 시중임금을 조사해 발표하고 있으며 이번에 발표한 임금은 전국의 1,700개 건설현장의 건설 관련 145개 직종을 대상으로 2006년 9월 한달간 실제 지급된 임금을 8시간 기준으로 조사한 것이다. 이번 임금 조사결과는 1월 1일부터 8월 30일까지의 건설공사 원가계산에 적용된다. 다음은 설비건설부문과 관련 직종 노임단가 분석 및 개별직종 노임단가 현황이다.

• 월간 기계설비
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• no.2 s.199
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• pp.66-70
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• 2007

벽산건설(주)은 1958년‘한국스레트공업주식회사’로 출발하여 우리나라 경제성장 시기를 함께하며 발전해왔다. 1991년 벽산건설(주)로 상호를 변경, 현재까지 국내 건설부문의 일익을 담당하고 있다. 벽산건설(주)은 특히 아파트 건설부문에서 두각을 나타내고 있다. 2005년 벽산건설(주)의 아파트 브랜드인“블루밍”에 대해 SDP(Self Design Project)를 런칭해 그동안 일률적이던 아파트 내부 건축에 대해 변화를 줘 고객에게‘자신만의 아파트’라는 이미지를 심어준 것이다. 끊임없이 발전하려는 벽산건설(주)의 노력이 지금의 벽산건설(주)을 만들게 된 원동력이다. 벽산건설(주)은 2007년을“내실기반의 지속성장을 하는 해”로 설정하고 올해 경영방침을 △수익기반의 다변화 △고객 만족 경영 △Software 경쟁력 강화로 정했다. 이에 따른 구체적인 경영전략으로 △전략적 제휴확대로 양질의 수주 확보 △Before Service 전사적 확대 △인적자원 경쟁력 강화 △핵심기술의 확보 및 개발 등 더 나은 기술과 고객만족을 위해 오늘도 정진하고 있다.

• 월간 기계설비
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• s.322
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• pp.112-115
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• 2017

근로기준법상 법정근로간은 1일 8시간, 주40시간입니다. 정부는 4월 14일부터 인사혁신처를 시작으로 금요일 조기퇴근제를 실시할 예정이라고 하는데요. 주40시간 범위내에서 월~목까지 매일 30분씩 연장 근로하는 대신 한달 중 금 1회 오후 4시에 조기퇴근하는 방식으로 운용될 예정이라고 합니다. 공공기관에서는 이미 유연근로시간제가 실시되고 있는 사업장도 있고 별도 연장 근무 없이 Family day 또는 culture day 등으로 명명하고 월 1회 조기 퇴근하는 제도를 운용하고 있기도 합니다. 기존에 자율적으로 기업형편에 따라 실시되었던 유언근로시간제와 더불어 금 조기퇴근제도는 공기업을 중심으로 좀 더 확대될 것으로 보입니다. 다만 국가공무원법이 적용되는 공무원과 달리 민간부문에서 유연근로시간제도를 도입하고자 할 경우에는 근로기준법을 준수하여야 하므로 법률에서 정한 유연근로시간제도의 유형에 따라 취업규칙의 변경 또는 근로자대표와의 서면합의 등의 절차를 거쳐야 합니다. 금요일 4시 조기퇴근제도는 탄력적 근로시간제도의 일 유형이라고 볼 수 있기에 이번 호에서는 탄력적 근로시간제도에 대해 알아보고자 합니다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.243-246
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• 2010

최근 정보량의 급격한 증가로 데이터센터는 점차 대형화되고 있으며, 통합적으로 관리/운영되기 위해서는 전산실내 적절한 온도와 습도의 유지가 필수적이므로, 전산실내 에너지의 사용 효율을 극대화하기 위한 연구가 꾸준히 이루어지고 있다. 이 연구에서는 국내 공공부문의 대형 전산실을 모델로 선정하여 전산실 내 서버의 위치, 용량 그리고 냉각시스템 등을 고려하여 전산실내 열/유동특성을 수치적으로 규명함으로써, 에너지 효율 극대화를 추구하고 전력을 절감하여 저탄소 녹색성장과 그린IT 환경을 구축 하고자 한다. 이를 위하여 실제 측정한 환경 데이터를 바탕으로 전산유체역학(CFD)을 이용하여 3차원 비압축성, 정상상태의 열/유동특성을 예측한다. 또한 기존 및 개선된 전산실에 대한 비교결과를 바탕으로 새로운 열/유동조건을 도출하며, 이를 통하여 전산실 운영에 필요한 에너지 효율향상 방안을 제안하고자 한다. 연구 결과, 전산실 천장의 냉기유입부분과 열기배출부분으로 나뉘어 냉복도와 온복도를 형성하며, 내부 서버와 기타 각종 장비들의 발열 등으로 부분적인 열섬(Thermal island)현상이 나타났다. 이러한 열섬현상을 줄이고, 전산실내 환경을 최적화하기 위하여 찬공기 유입부분의 속도, 배출구의 유량, 그리고 냉/온 복도의 역할 변경 등 여러 가지 가능한 매개변수에 대한 연구가 필수적이다. 또한, 서버에서 발생한 고온의 공기를 배출하는 것이 전산실 내 적절한 온도구현에 효과적이며, 열섬현상을 방지하기 위해서는 이 부분에 차가운 공기의 유입이 필요하다는 것을 알 수 있었다.

• Design & Manufacturing
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• v.17 no.4
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• pp.1-7
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• 2023

In the fabrication of curved multi-display glass for automotive use, the surface roughness of the mold is a critical quality factor. However, the difficulty in detecting micro-cutting signals in a micro-machining environment and the absence of a standardized model for predicting micro-cutting forces make it challenging to intuitively infer the correlation between cutting variables and actual surface roughness under machining conditions. Consequently, current practices heavily rely on machining condition optimization through the utilization of cutting models and experimental research for force prediction. To overcome these limitations, this study employs a surface roughness prediction formula instead of a cutting force prediction model and converts the surface roughness prediction formula into experimental data. Additionally, to account for changes in surface roughness during machining runtime, the theory of position variables has been introduced. By leveraging artificial neural network technology, the accuracy of the surface roughness prediction formula model has improved by 98%. Through the application of artificial neural network technology, the surface roughness prediction formula model, with enhanced accuracy, is anticipated to reliably perform the derivation of optimal machining conditions and the prediction of surface roughness in various machining environments at the analytical stage.

• The Journal of the Korea Contents Association
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• v.13 no.2
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• pp.390-399
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• 2013

The purpose of this study is to examine the impact of enterprise R&D investment on inter-industry technology spillover in Korea under the new Normal Era. In order to do this, we tested the effect of production inducement, backward and forward linkage effects, and the effect of technology spillover such as technology intensity effects and technology diffusion effects based on an input-output framework. The results show that the high index industries of the production inducement effect were professional, scientific and technical activities, manufacture of metal products, and general machinery. Some manufacturers of other non-metallic mineral products and transport equipment sectors appeared to have the strong effect of forward and backward linkages that were almost equivalent to high-tech manufacturing industries. In particular, the industries of professional, scientific and technical activities appeared to have the strong effect of both forward and backward linkages. Therefore, we need to drive a strong policy support to higher enterprise R&D investment in the those particular industries not only to increase global competitiveness, but also to widen up the technology spillover effect on other industries.

• Clean Technology
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• v.26 no.4
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• pp.293-303
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• 2020

According to the World Health Organization (WHO), air pollution is a typical health hazard, resulting in about 7 million premature deaths each year. Sulfur dioxide (SO2) is one of the major air pollutants, and the combustion process with sulfur-containing fuels generates it. Measuring SO2 generation in large combustion environments in real time and optimizing reduction facilities based on measured values are necessary to reduce the compound's presence. This paper describes the concentration measurement for SO2, a particulate matter precursor, using a wavelength modulation spectroscopy (WMS) of tunable diode laser absorption spectroscopy (TDLAS). This study employed a quantum cascade laser operating at 7.6 ㎛ as a light source. It demonstrated concentration measurement possibility using 64 multi-absorption lines between 7623.7 and 7626.0 nm. The experiments were conducted in a multi-pass cell with a total path length of 28 and 76 m at 1 atm, 296 K. The SO2 concentration was tested in two types: high concentration (1000 to 5000 ppm) and low concentration (10 ppm or less). Additionally, the effect of H2O interference in the atmosphere on the measurement of SO2 was confirmed by N2 purging the laser's path. The detection limit for SO2 was 3 ppm, and results were compared with the electronic chemical sensor and nondispersive infrared (NDIR) sensor.

• Design & Manufacturing
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• v.17 no.1
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• pp.20-26
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• 2023

Lab-on-a-disc is a circular disc shape of cartridge that can be used for blood-based liquid biopsy to diagnose an early stage of cancer. Currently, liquid biopsies are regarded as a time-consuming process, and require sophisticated skills to precisely separate cell-free DNA (cfDNA) and circulating tumor cells (CTCs) floating in the bloodstream for accurate diagnosis. However, by applying the lab-on-a-disc to liquid biopsy, the entire process can be operated automatically. To do so, the lab-on-a-disc should be designed to prevent blood leakage during the centrifugation, transport, and dilution of blood inside the lab-on-a-disc in the process of liquid biopsy. In this study, the main components of lab-on-a-disc for liquid biopsy are fabricated by injection molding for mass production, and ultrasonic welding is employed to ensure the bonding strength between the components. To guarantee accurate ultrasonic welding, the flatness of the components is optimized numerically by using the response surface methodology with four main injection molding processing parameters, including the mold & resin temperatures, the injection speed, and the packing pressure. The 27 times finite element analyses using Moldflow® reveal that the injection time and the packing pressure are the critical factors affecting the flatness of the components with an optimal set of values for all four processing parameters. To further improve the flatness of the lab-on-a-disc components for stable mass production, a quarter-disc shape of lab-on-a-disc with a radius of 75 mm is used instead of a full circular shape of the disc, and this significantly decreases the standard deviation of flatness to 30% due to the reduced overall length of the injection molded components by one-half. Moreover, it is also beneficial to use a quarter disc shape to manage the deviation of flatness under 3 sigma limits.

• Journal of the Korean Institute of Gas
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• v.27 no.1
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• pp.70-77
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• 2023

Air environment regulations have been strengthened due to increasing air pollutant emissions, the target of reducing emissions has increased and interest in gas measurement methods is also increasing. The sampling method is mainly used, but due to the spatial and temporal measurement limitations, the laser absorption spectroscopy which is a real-time and in-situ method is in the spotlight. In this study, we studied the wavelength modulation spectroscopy and described the calibration-free algorithm. The developed algorithm was modified to reflect 46 multi-absorption lines and was applied to light absorption signal analysis in visible and mid-infrared regions. In addition, the difference between the modulation parameters of laser was analyzed. As a result of reviewing the performance through O₂ and NO gas measurement experiments of various concentration conditions, the linearity was R²_O2=0.99999 and R²_NO=0.99967.

• Journal of the Korean institute of surface engineering
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• v.54 no.5
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• pp.267-277
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• 2021

Nitriding layers developed during gaseous nitriding of AISI4115 steels for the application of steel bushing part were investigated. The compound layer thickness of about 10㎛, 0.3mm of case depth under the same conditions, and conventional nitriding, nitrocarburizing, and controlled nitriding were performed in three methods. In the controlled nitriding, K_N was controlled by measuring the hydrogen partial pressure. The nitrided samples were analyzed by micro Vickers hardness test, optical microscopy and scanning electron microscopy. The phases of compound layer were identified by X-ray diffraction and electron backscatter diffraction. The controlled nitriding specimen indicated the highest surface hardness of about 860 HV_0.1. The compound layer of the conventional nitriding and nitrocarburizing specimen was formed with about 46% porous layer and 𝜺 + 𝜸' phase, and about 13% porous layer and about 80% 𝜸' phase were formed on the controlled nitriding specimen. As a result of the Ball-on-disk wear test, the worn mass loss of ball performed on the surface of the controlled nitriding specimen was the largest. The controlled nitriding specimen had the highest surface hardness due to the lowest porous percentage of compound layer, which improved the wear resistance.