• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2014.05a
• /
• pp.222-223
• /
• 2014

In this study, industrial by-products including blast furnace slag, incineration ash and waste gypsum were used with recycled fine aggregates to manufacture the zero-cement mortar.The replacement ratio of dihydrate gypsum and anhydrite gypsum was fixed as 0 and 10%, the replacement ratio fo WA1 was fixed as 0.5% and 1.0%, respectively. It could be identified that when the replacement of gypsum was 10% and WA1 of 1.0%, the strength could be in the range of normal strength.

• Transactions of the Korean Society of Machine Tool Engineers
• /
• v.11 no.1
• /
• pp.26-31
• /
• 2002

In this study an experimental investigation was conducted to find the grinding characteristics of ceramics, STD11 and STS304 materials. The grinding force and the microscopic observation of the workpieces were obtained in surface grinding. Grinding characteristics of ceramics were inspected through the microscopic examination the cutting force, and the surface roughness. It has been found that the finding force of ceramics is relatively low as compared to that of steels and that CBN wheel has an excellent performance. The surface roughness was measured according to the feedrate and the depth of out.

• Composites Research
• /
• v.13 no.5
• /
• pp.44-49
• /
• 2000

Although the net-shape molding of composites is generally recommended, molded composites frequently requires cutting or grinding due to the dimensional inaccuracy for precision machine elements. The surface roughness and cutting force were also measured to investigate the surface grinding characteristics of the composites using the vitrified bonded wheel (WA, GC). The experiments were performed dry grinding conditions with respect to cutting speed, feed speed, depth of cut of the stacking sequence $[O]_{nT.}$ From the experimental investigation, the optimal conditions both the vitrified bonded wheel WA and GC for the surface grinding are suggested.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.12 no.6
• /
• pp.151-157
• /
• 2004

In this paper deals with behavior of the magnetic abrasive using sludge on polishing characteristics in a new internal finishing of seamless stainless steel tube applying magnetic abrasive polishing. The magnetic abrasive using sludge-abrasive grain WA and GC used to resin bond fabricated low temperature. And sludge of magnetic abrasive powder fabricated that sludge was crused into 200 mesh. The previous research have made an experiment in the static state the movement of magnetic abrasive grain is nevertheless in the dynamic state. In this paper, We could have investigated into the changes of the movement of magnetic abrasive grain. In reference to this result, we could have made the experiment which is set under the condition of the magnetic flux density, polishing velocity according to the form of magnetic brush.

• Journal of the Korean Institute of Educational Facilities
• /
• v.4 no.2
• /
• pp.13-20
• /
• 1997

The total evaluation of educational environment is needed with the rapid growth of the number of students. Especially it is very important to evaluate the physical environment of the classroom in elementary schools where the students spend their whole school life. This study aims to evaluate the daylighting and sound insulation performance of the classroom in elementary school, considering factors such as ceiling height and Wi/Wa (Window/Wall) ratio and then to plan the classroom. Analytic results of the daylighting and sound insulation performance show that the optimum Wi/Wa ratio is $35{\sim}45%$. Reduction of the ceiling height from 3.3m has little influence on the distribution of the indoor daylight factor and sound insulation performance

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2012.10a
• /
• pp.343-344
• /
• 2012

본 논문에서는 국토해양부 해양교통시설과의 연구개발과제인 '광역보정시스템(WA-DGNSS) 구축기술개발' 과제의 현재까지 진행사항과 주요 연구결과에 대하여 설명한다. 본 연구개발과제에서는 전국토에 균일한 정확도, 가용성 및 무결성 성능을 보장할 수 있는 광역보정시스템의 핵심알고리듬을 개발하고 지상기반 데모시스템 구축을 완료하여 최종 년도에는 의사위성을 통한 실시간 데모를 실시할 예정이다. 또한 미래 다중 GNSS에 대비하여 GLONASS 및 Galileo를 포함하는 광역보정시스템의 성능을 시뮬레이션을 통해 예측하였다. 본 과제에서 개발된 연구 결과들은 알고리즘 설명서 및 핵심기술권고사항으로 문서화되어 2014년부터 진행될 위성기반 광역보정시스템(SBAS)의 개발에 직접적으로 활용될 예정이다.

• Advances in concrete construction
• /
• v.5 no.5
• /
• pp.437-450
• /
• 2017

The present work investigates about the development of a novel construction material by utilizing Granulated Blast Furnace Slag (GBS), an industrial waste product, as substitution of natural fine aggregates. For this, experimental work has been carried out to determine the influence of GBS on the properties of concrete such as compressive strength (CS), modulus of elasticity, ultrasonic pulse velocity (UPV), chloride penetration, water absorption (WA) volume of voids (VV) and density. Concrete mixes of water/cement (w/c) ratios 0.45 and 0.5, and incorporating 20%, 40% and 60% of GBS as partial replacement of natural fine aggregate (sand) are designed for this study. The results of the experimental investigation depict that CS of concrete mixes increases with the increasing percentages of GBS. Moreover, the decrease in chloride penetration, WA and VV, and improvement in the modulus of elasticity, UPV, density of concrete is reported with the increasing percentage of GBS in concrete.

• CELLMED
• /
• v.12 no.3
• /
• pp.12.1-12.6
• /
• 2022

With a prevalence incidence of 8 % to 37%, unexplained infertility (Uqr) is by definition empiric because it does not address a particular defect or functional deficits. Couples with unexplained infertility have a higher than zero chance of becoming pregnant without treatment, but it is less likely than couples who are fertile. The ingredients in the Unani formulation, are baikh asgand (Withania somnifera Dunal), baikh piyabansa (Barleria prionitis Linn), gule dhawa (Anogeissus latifolia), and gule nilofar (Nymphaea alba Linn), were used to treat unexplained secondary infertility, possess the characteristics of muqawwi bah (Aphrodisiac), muqawwi Rahim (Uterotonic), muwallid-i-mani (ovulation-inducing), and mughalliz-i-mani (an agent which increases the viscosity of semen) beginning from the fifth day of the last menstrual cycle for five days with milk. The first cycle of treatment led to the conception of the women.

• 어항어장
• /
• s.80
• /
• pp.34-37
• /
• 2007

바이오매스 이용.활용 사업은 수산업. 어촌의 활성화를 목적에 두고 있으므로 경제성이 우수해야하는 것이 필수 조건이지만, 한편 지구 온난화 방지나 순환형 사회구축이라는 목적을 가지고 있어 경제성뿐만 아니라 탄소 고정 등 한경에 공헌하는가도 평가의 대상으로 검토하는 것이 바람직하다.

• 어항어장
• /
• s.80
• /
• pp.47-49
• /
• 2007

패각을 사용한 사료 배양기질은 패각에 의해 복잡한 공간이 다수 형성되어 많은 소형 생물의 증식에 좋은 조건을 만들어 내고 도 패각에 부착한 소형 생물을 먹기 위해 물고기가 모이고, 많은 해초류도 번성하는 것으로 알려져 있다.