• 한국화재소방학회논문지
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• 제16권2호
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• pp.14-21
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• 2002

다중이용시설에서 많이 사용중인 바닥마감재를 대상으로 연소가스의 독성을 NES 713의 방법에 의해 평가하였다. 또한, 공기가 공급되지 않는 밀폐된 공간에서의 연소시 각 시료에 따라 발생할 수 있는 유독성가스를 가스분석기를 이용하여 시간변화에 따라 연속적으로 측정하여 비교·분석함으로서 화재 시 내포하고 있는 바닥마감재의 위험성을 평가하였다. NES 713 방법에 의한 각 제품의 유독가스의 독성지수를 살펴본 결과 2～9.7의 값을 갖고 있으며, 화재시 유독가스에 의한 매우 큰 위험성을 내포하고 있다.

• Asian-Australasian Journal of Animal Sciences
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• 제30권11호
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• pp.1563-1567
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• 2017

Objective: The influence of substituting steam-flaked corn (SFC) for dry rolled corn (DRC) on feedlot cattle growth performance and dietary net energy when cattle are allowed either ad libitum or 2-h restricted access to the finishing diet was evaluated. Methods: Treatment effects were tested using 96 crossbred steers ($251{\pm}2kg$) during the initial 56 d of the finishing phase. Cattle were blocked by weight and randomly assigned within blocks to 16 pens (4 pens/treatment). Bunk space was sufficient (41 cm/head) to allow all steers access to the feed bunk at the same time. Treatments consisted of two finishing diets containing (dry matter basis) 77.1% corn grain processed by dry rolling (density = 0.50 kg/L) or steam flaking (density = 0.36 kg/L). Cattle were fed twice daily at 06:00 and 14:00 h, allowing for approximately 5% residual. In the case of restricted feeding, steers were allowed access to feeders for 1 h following each feeding, after which residual feed was withdrawn. Results: There were no treatment interactions on dry matter intake (DMI), average daily gain (ADG), gain efficiency (G:F), or dietary net energy (NE). Restricting feed access time reduced (p<0.01) feed intake, and hence, ADG. Substitution of SFC for DRC increased (p<0.01) ADG, feed efficiency (G:F), and estimated dietary NE, without affecting DMI. Based on tabular net energy of maintenance ($NE_m$) value (2.18 Mcal/kg) for DRC, the estimated $NE_m$ value for SFC using the replacement technique, averaged 2.44 Mcal/kg; an improvement of 10.7%. The ratio of observed-to-expected dietary NE was not affected by feed access time. Conclusion: Substitution of SFC for DRC in finishing diets for feedlot cattle enhanced ADG, gain efficiency, and the NE value of the diet. Although restriction of feed access time depressed DMI and ADG, it did not affect the comparative benefit of steam flaking toward enhancement of ADG, G:F, and dietary NE.

• 한국기계가공학회지
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• 제5권1호
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• pp.13-18
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• 2006

The magnetic abrasive machining has been developed as a new finishing technology to obtain a fine surface of workpiece. In this paper, a static magnetic field method and a magnetic abrasive brush which has many technical advantages, are applied for the magnetic abrasive machining. In the experiment, some items such as finishing time, ratio of the magnetic abrasives to Fe-powder, motor revolutions per minute, and motor ratio revolutions per minute are tested. The results of this study have shown the fact that the burr height is mostly affected by the finishing time and the abrasive ratio. Also, it has been found that the magnetic abrasive machining is a possible new technology for the deburring.

• 패션비즈니스
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• 제15권4호
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• pp.110-121
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• 2011

As car seat is the closest part between driver and rider, the interest of the security and comfort of the seat is increasing. This research discovered the best condition for dyeing and finishing to produce a fabric for car seat and also developed the design of fabrication to give the feeling from such a finishing. The best condition of coating finishing solution is aqueous PU 65%, dye resist reagent 20%, water 12%, thicker 3%, and knife thickness 2mm, tenter temperature $170^{\circ}C$, tenter speed 35yard/min, viscosity 12,000cps and stirring time 100kg * 30min. According to the processing time of knife coating upon stirring the change of resin and the uneven of coating quantity was shown. This problems will be solved by means of automatic temperature control apparatus for resin and sealing device through a coming research.

• 한국기계가공학회지
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• 제12권2호
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• pp.100-106
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• 2013

Stainless steel has some excellent properties as the material for the mechanical component. Purpose of this study is carried out to obtain mirror surface on the surperfinishing of stainless steel with high efficiency. To achieve this, we have conducted a series of polishing experiment for stainless steel using abrasive film from the perspective of oscillation speed, the rotational speed of workpiece, contact roller hardness, contact pressure and feed rate. Abrasive film used this study is a micro-finishing film and a lapping film. Furthermore, the polishing characteristics and efficiency of stainless steel is discussed through measuring optimal polishing time and surface roughness. From the obtained results, it was confirmed that efficient superfinishing conditions and polishing characteristic of Stainless steel can be determined.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.1017-1021
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• 2005

There is a need for effective tracking and control of material loading and delivery time especially during the finishing-work phases to eliminate the need for lay-down space on the site. Hence, it is essential to monitor the relevant information regarding material procurement in construction sites, and it is also the key factor for successful site control and the adoption of the Just-in-Time concept for high-rise building construction. The purpose of this study is to test RFID's readability in order to develop a finishing material monitoring system through the application of RFID technology.

• 한국염색가공학회지
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• 제11권2호
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• pp.55-63
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• 1999

The purpose of this study was to investigate the purification of chitin and chitosan for textile finishing agent from crab shell. Weight loss rate(removing Ca and protein), degree of deacetylation, solubility and MIC(Minimum growth inhibitory concentration) value of chitosan and molecular weight of the treated crab shell were measured. The results of this study were as follows : 1) Weight loss rate(removing Ca) of crab shell treated with HCI increased with the concentration of HCI and treatment time, but it became constant over 60 min. of treatment time. 2) Weight loss rate(removing protein) of crab shell treated with NaOH(0.5N∼2N) increased with the concentration of NaOH and treatment temperature and time, but it became constant above loot of temperature and over 200 min. of treatment time. 3) Degree of deacetylation of chitin treated with NaOH increased with the concentration of NaOH(40∼60％), but molecular weight decreased and thus MIC value increased. 4) Concentration of acetic acid should be above 0.3％ to dissolve chitosan easily. Solubility for chitosan was the highest with formic acid, and the next was acetic acid, hydrochloric acid, lactic acid and sulfuric acid in order.

• 한국건설관리학회논문집
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• 제19권2호
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• pp.50-60
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• 2018

최근 인력자원 투입량 감소 및 공기단축이 가능한 모듈러 건축공법은 반복 공정이 많은 기숙사, 주거시설, 호텔 공사 등에 다양하게 적용되고 있다. 모듈러 건축공법은 유닛 설치비용을 제외한 현장 공사비에서 외장 마감공사 비용의 비중은 약 40%를 차지하며, 마감공사는 목표공기와 비용을 유지하는데 주요한 역할을 한다. 모듈러 현장에서 유닛 설치 및 마감공사 수행을 위해 한정된 장비가 후속 액티비티에 영향을 주지 않도록 공유되어야 하며 현장 마감 비중이 커지는 모듈러 프로젝트일수록 공정관리에서 양중 계획은 매우 중요하기 때문이다. 이와 같은 T/C 운용 계획은 단일 사이클 또는 다중 사이클의 형태를 가지게 되며 사이클 주기 조율은 장비효율을 높일 수 있다. 그러나 유닛 설치 및 마감공사를 지원하기 위한 T/C 운용 계획의 대안을 평가하는데 어려움이 있다. 따라서 본 연구는 모듈러 건축 현장에서 T/C 운용의 사이클 주기 설정에 따른 운용방식의 대안을 평가하기 위해 유닛 양중 시간 및 주기, 외장재 양중 시간, 마감 작업 소요시간을 변수화하여 T/C 가동시간과 공정에 주는 영향을 파악한다. 이러한 목적을 달성하기 위해 현장에서 이루어지는 작업 프로세스 분석을 바탕으로 작업 속도를 조절하여 T/C 효율을 증대시킬 수 있는 시뮬레이션 모델을 개발한다. 본 연구는 양중 사이클 개념을 적용한 자원 평준화 방법을 제시함으로써 학술적 기여가 있으며 실무적으로 현장관리자에게 장비 계획의 대안 선택을 위한 기초자료로서 활용될 수 있을 것이다.

• 한국염색가공학회지
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• 제4권1호
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• pp.21-25
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• 1992

The charge-transfer(CT) complexes derived from various donors and acceptors were evaluated as coloring matter. Dyes absorbing light in the region from the visible to the near-infrared wavelengths were synthesized. In order to determine the molar ratio of the donor to the acceptor in the CT complex in the solution, the continuous variational method was applied to each system. A 1:1 correspondence between the donor and the acceptor molecules in the CT complex in the solution is established. Color development properties in paper were examined. The longer the exposure time at constant temperature, the deeper the strength of color in paper. The strength of color at high temperature was decreased, because sublimed CT dyes in paper were migrated out side of paper.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1248-1252
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• 2005

Mold-manufacturing process consists of machining and finishing process that are strongly related in each other. But there are few studies about mold-manufacturing process to control those two processes simultaneously. Especially, runout distorts the machined surface from expected so it changes the finishing process and mold-manufacturing time. In this work, basic analyses and experiments were carried out to study RVAS variation according to runout in HSM. To perform those analyses, firstly surface generation analysis was done including runout in ball end milling and then the RVAS that could relate machining and finishing process was proposed. And the optimal finishing process in HSM according to RVAS was also proposed. Through experiment runout occurrence and above analyses were verified.