• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2000.04a
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• pp.7-11
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• 2000

• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.3
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• pp.314-320
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• 2022

The function of reinforcing fibers used in building materials is to maintain resistance to bending loads and to function for cracking caused by drying shrinkage. High-density fiber-cement composites are mainly used for linear plates and are used to increase bending resistance. Therefore, tensile properties, bonding strength with cement hydrate, alkali resistance, and the like are required. Recently, as the non-combustible performance has been strengthened, a function to minimize the occurrence of sparks during high-temperature heating has been added. Therefore, the use of organic fibers is limited. In this study, a study was conducted to replace polypropylene used as reinforcing fiber with hemp fiber with excellent heat resistance. Hemp fibers have excellent heat resistance, good affinity with cement, and excellent alkali resistance. Based on the total volume of polypropylene fibers used in the existing formulation, the non-combustible performance was compared and evaluated by using hemp fibers instead of the polypropylene fibers, and basic physical properties such as flexural strength were tested. As a result of conducting a non-combustibility and physical property test using hemp fibers with a fiber length of 7 mm using 2 % and 3 % by weight, it was found that there is no remaining time of the flame, and the flexural strength can be secured at 95 % level of the existing polypropylene fiber.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.4
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• pp.642-649
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• 2021

Energy saving standard for buildings are strengthened, the application of exterior insulation finishing system and thickness of insulation materials are increasing. Most buildings with exterior insulation finishing system is applied organic insulating material. Organic insulating material have workability, economic feasibility, reduction in construction cost, and excellent thermal insulation performance. However, Organic insulating material is very vulnerable to heat, so when a fire occurs, rapid fire spread and toxic gas are generated, causing many casualties. Inorganic insulating material can be non-combustible performance, but it is heavy and has low thermal insulation performance. Mineral wool has higher thermal insulation performance than other types of inorganic insulating material, but mineral wool is disadvantageous to workability and vulnerable to moisture. Glass bubble are highly resistant to water and chemically stable substances. In addition, the density of the glass bubble is very low and the particles are spherical, fluidity is improved by the ball bearing effect. Glass bubbles can be used with cement-based ino rganic insulating material to impro ve the weight and thermal insulatio n perfo rmance o f cement-based inorganic insulation. This study produced a inorganic insulating materials were manufactured using cement-based materials and glass bubble. In order to evaluate the insulation performance and flame retardant performance of cement-based super light-weight inorganic insulating materials using with glass bubble, insulation performance or flame retardant and non-combustible performance were evaluated after manufacturing insulating materials using micro cement and two types of glass bubbles. From the test result, Increasing the mixing ratio of glass bubbles improved the insulation performance of cement-based super light-weight inorganic insulating materials, and when the mixing ratio of glass bubbles was 10%, it sho wed sufficient flame retardant and no n-co mbustible perfo rmance.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.460-463
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• 2012

인류의 문제점 중 하나는 환경 및 자원고갈의 문제에 직면해 있는 상황이다. 자원 고갈과 환경 문제를 조금이나마 해소하는 방법으로 폐자원을 이용하는 방법이 있으며 그 중 재활용 방안으로 화력발전소에서 사용 후 폐기물로 분류되는 석탄회를 이용하는 것이다. 국내 석탄회의 발생량은 2004년 현재 500만 톤으로, 2011년 약 700만 톤 이상일 것으로 추정되며, 이중 보일러 저부에서 채취되는 Bottom Ash가 약 20%로 100만 톤 이상 발생되는 것으로 보고되고 있다. 본 연구에서는 자원고갈과 환경오염문제를 해결하기위해 석탄회를 재활용하여 불연성능을 가진 기능성 바닥재 개발을 연구하고자 한다.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2015.11a
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• pp.166-167
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• 2015

단열재를 생산하는 회사에서는 대부분 유기단열재를 사용하고 있다. 커튼윌 시스템은 경제적이면서 성능이 우수하지만 불연성이지 않다. 따라서 근래에 안전사고가 많아지고 있어서 타지 않는 무기 단열재가 필요하다. 또한 안전과 단열효과 및 소비자가 요구하는 친환경적인 무기단열재가 필요하므로 불연성 무기단열재의 개발이 시급하다. 본 논문은 무기단열재의 문제인 흡수성을 실험하기 위하여 가습기를 이용하여 흡수성 실험을 하였고 경량골재인 펄라이트와 바인더를 섞고 흡수방지제로 처리한 샘플과 그렇지 않은 샘플의 흡수율을 측정하여 에너지 효율 지속성 단열재의 기술연구를 목표로 한다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2020.06a
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• pp.54-55
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• 2020

Recently, "The rules on the standards of evacuation and fire protection of buildings" require that non-burnable materials such as non-combustible and semi-non-combustible materials be used as the materials applied to the building's exterior walls, but styrofoam, which is a combustible material, has been applied a lot and became a social issue. In this study, we developed a non-combustible outer wall molding to secure construction and economic feasibility and free expression using CLC(CLC: Cellular Light-weight Concrete).

• The Journal of the Acoustical Society of Korea
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• v.21 no.3
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• pp.285-292
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• 2002

One of the problems that should be solved in Text-To-Speech (TTS) is discontinuities at unit-joining points. To cope with this problem, a smoothing method using a low-pass filter is employed in this paper, In the proposed soothing method, a filter coefficient that controls the amount of smoothing is determined according to contort information to be synthesized. This method efficiently reduces both discontinuities at unit-joining points and artifacts caused by undesired smoothing. The amount of smoothing is determined with discontinuities around unit-joins points in the current synthesized speech and discontinuities predicted from context. The discontinuity predictor is implemented by CART that has context feature variables. To evaluate the performance of the proposed method, a corpus-based concatenative TTS was used as a baseline system. More than 6075 of listeners realized that the quality of the synthesized speech through the proposed smoothing is superior to that of non-smoothing synthesized speech in both naturalness and intelligibility.

• Journal of the Korean Recycled Construction Resources Institute
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• v.3 no.4
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• pp.328-334
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• 2015

Building insulation materials use for the purpose of energy saving. Insulation materials can be classified inorganic and organic insulation materials. Inorganic insulation is used for fire resistive performance parts and organic insulation is used for thermal performance parts. Meanwhile, organic insulation is due to toxic gas emission in fire. Inorganic insulation is too heavy and low thermal performance than organic materials. This study is focused on evaluation of the physical properties of inorganic foam material using industrial by-products such as waste glass powder and fly ash. From the test result, inorganic foam materials for the applicability of fire-resistance and insulation light-weight materials.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2497-2500
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• 2003

본 논문에서는 저속으로 회전하는 모터의 속도를 추정함에 있어서 속도 관측기를 이용하고 적절한 보상을 통해 가속/감속 운전 시에도 속도 추정 성능을 개선시킨다. 가속도 정보를 이용한 보상을 통해, 모터 인코더카운터 값으로부터 발생하는 양자화 오차를 줄인다. 가속/감속 운전시 인코더 펄스에 의한 평균속도는 펄스가 발생한 시점에서 불연속일 수밖에 없게 된다. 제안된 방식은 이 불연속적인 평균속도를 가속도 보상을 통해 연속적으로 증감하는 보상된 속도를 얻고 이를 다시 관측기 입력에 보상하여 양자화 오차를 감소시킨다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.2
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• pp.188-193
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• 2010

In this paper, SI(Signal Integrity) characteristic of the 4-layer PCB(Printed Circuit Boards) with a through-hole via was analyzed by impedance mismatching between the through-hole via and the transmission line, and deterioration of clock pulse response characteristic due to the P/G plane resonances which are generated between the power and the ground plane. The minimized impedance mismatching between the through-hole via and the transmission line for the improving of SI characteristic is confirmed by the TDR(Time Domain Reflector) simulation and lumped element modeling of the through-hole via. And the cancellation method of P/G plane resonances for improvement of the SI characteristic is represented by simulation result.