• Title/Summary/Keyword: Composite Wall

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Sound Transmission Performance of Composite panels : Reverberation chamber vs. Cabins in Ship (복합판넬의 차음특성 비교 : 잔향실과 실선)

  • Kang, Hyun-Ju;Kim, Jae-Seung;Kim, Hyun-Sil;Kim, Sang-Ryul
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.06a
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    • pp.843-848
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    • 2000
  • This paper deals experimently with the difference between the cabins in ship-board and the reverberation chamber in sound transmission loss. Experimental results from the cabins show that there are various flanking transmission losses which deteriorate significantly the performance of the sound transmission loss. They also show that as a representative of the flanking transmission losses, sound leakages between a ceiling and a wall, the joints of the partitions, and the luminant devices play an important role. From the various measurements, it can be is concluded that unless one do not take any treatments on the flanking transmission loss, the field sound transmission loss will be considerably decreased by more than 10 dB, comparable to the sound transmission loss.

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Properties of Density and Thermal Conductivity according to Addition ratio of Vermiculite of Lightweight Composite Panel Core (경량복합패널 심재의 버미큘라이트 첨가율에 따른 밀도 및 열전도율 특성)

  • Sin, Jin-Hyun;Kim, Heon-Tae;Kim, Tae-Hyun;Lee, Dong-Hoon;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.10a
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    • pp.111-112
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    • 2016
  • Lately, In case of domestic fire situation, Suffocation due to inflammables has shown higher than direct disaster of the fire among the statistics of death caused by disaster. According to study, Lightweight Hybrid Panel as using the inner or outer wall is made with Polysilicon of the inorganic material, PA and vermiculite, so we make progress to performance experiment and review the density, thermal conductivity properties.

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Analysis of Essential Function of Composite Sensor for the Ground Work of a Large Construction Project (대형 건설프로젝트 현장관리를 위한 복합센서의 필수기능 분석)

  • Cho, Nam-Seok;Kim, Chang-Won;Cho, Dae-Gu;Cho, Hun-Hee;Kang, Kyung-In
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.05a
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    • pp.39-40
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    • 2012
  • Construction IT convergency proposes advanced management abilities of a construction project. Sensing data provided by various sensor technologies can be utilized for diverse management areas. This study analyzes required functions of sensors for implementing time, cost, safety and quality management, focusing on the ground works including excavation, pipe installation, retaining wall etc. Therefore, this study first generates essential management areas, analyzes cutting-edge sensor technologies appropriated for the areas, and finally proposes a matrix system that represents relationships between the management areas and sensor technologies, The proposed system is expected to reinforce construction management abilities by integrating sensor technologies.

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Bentall`s Operation of Ascending Aorta Aneurysm with Aortic Regurgitation - Report of One Case - (Bentall 씨 수술 치험 -1례 보고-)

  • 정황규
    • Journal of Chest Surgery
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    • v.21 no.2
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    • pp.334-339
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    • 1988
  • We have experienced one case of ascending aorta aneurysm with aortic regurgitation due to atherosclerosis. The 45 year old man had been suffered from palpitation and precordial chest pain. 2-D echocardiogram and aortogram confirmed aneurysm of ascending aorta with aortic regurgitation. Atherosclerotic change was noted in the aortic wall and there was marked dilatation of the sinuses of Valsalva as well as the aortic annulus with upward displacement of coronary ostia in the operative field. The patient underwent complete replacement of the aneurysmal ascending aorta and the aortic valve with 27mm Bjork-Shiley aortic valve composite graft. We got preclotting with heparin free blood including thrombin and then autoclave at 132` for 3 minutes. The postoperative course was uneventful and the patient was discharged with good clinical result.

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Sound Absorption Effects in a Rectangular Cavity According to the Surface Impedance of Wall (벽면의 임피던스변화에 따른 폐공간 내부에서의 음장특성 분석)

  • 오재응;김상헌;도중석
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1997.04a
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    • pp.687-694
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    • 1997
  • The anisotropy and shape of distributed piezopolymer actuator have advantages over isotropic piezo ceramic materials, since these features of PVDF can be utilized as another design variable in control application. This study is interested in the reduction of sound transmission through elastic plate into interior space by using the PVDF actuator. The plate-cavity system is adopted as a test problem. The vibration of composite plate and the sound fields through plate are analyzed by using the coupled finite element and boundary element method. Some numerical simulations are performed on sound transmission through elastic plates. To investigate the effects of anisotropy and shape of distributed piezopolymer actuator, various kinds of distributed PVDF actuators are applied in sound control simulation for isotropic and anisotropic plates. The PVDF actuators applied are different from each other in their shapes and laminate angles. The results of control simulation show that the control effectiveness of distributed PYDF actuator can be enhanced by using the coupling between shape of actuator and vibration modes of structure and the anisotropy of piezoelectric properties of PVDF.

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Variation of the Switching Field of Composite Nanowires with Different Widths

  • Kim, Seung-Ho;Lee, Han-Seok;Lee, Seung-Hyun;Lee, Woo-Young;Lee, J.
    • Journal of Magnetics
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    • v.13 no.4
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    • pp.167-169
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    • 2008
  • The switching field of a 300 nm wide nanowire has been controlled by attaching a wide wire to it. The width of the wide wires varies from 700 nm to 2000 nm. While the connection of the two wires does not affect the switching field of the wide wires, it strongly affects the 300 nm-wire, resulting in a decrease of the switching field of the isolated wire from 175 Oe to 54 Oe when the 2000 nm-wire is connected to it. This result clearly shows that the switching field of the nanowire can be engineered by attaching a nucleation pad that has a different magnetic anisotropy.

The Solidification Characteristics of Styronaphthalene Pattern Materials (스티로나프타린 모형재료의 응고특성)

  • Park, Heung-Il
    • Journal of Korea Foundry Society
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    • v.23 no.1
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    • pp.47-51
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    • 2003
  • This experimental study was carried out to investigate the solidification characteristics of polystyrene added styronaphthalene pattern materials using various castability test methods. The styronaphthalene showed an excellent filling capacity and shaping behavior having about 0.2 mm meniscus radius. The shell thickness of styronaphthalene showing smooth wall at the solid/liquid interface increased with the increasing of polystyrene addition. The solidification microstructure of styronaphthalene showed a typical thin ribbon reinforced composite structure, which has fibrous amorphous skeleton of polystyrene and crystalline naphthalene. From the results of this study, it was found that the polystyrene added styronaphthalene showed a precision shaping behavior as disposable pattern material under the atmospheric condition.

Use of temporary filling material for index fabrication in Class IV resin composite restoration

  • Kim, Kun-Young;Kim, Sun-Young;Kim, Duck-Su;Choi, Kyoung-Kyu
    • Restorative Dentistry and Endodontics
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    • v.38 no.2
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    • pp.85-89
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    • 2013
  • When a patient with a fractured anterior tooth visits the clinic, clinician has to restore the tooth esthetically and quickly. For esthetic resin restoration, clinician can use 'Natural Layering technique' and an index for palatal wall may be needed. In this case report, we introduce pre-restoration index technique on a Class IV defect, in which a temporary filling material is used for easy restoration. Chair-side index fabrication for Class IV restoration is convenient and makes a single-visit treatment possible.

Reinforced Earth Structures (보강토 공법)

  • 이은수
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.10a
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    • pp.301-313
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    • 2001
  • Reinforced earth is a composite construction material in which the strength of engineering fill is enhanced by the addition of strong tensile reinforcement in variable types. The basic mechanism of reinforced earth involves the generation of frictional forces and bearing resistances between the soil and the reinforcement. The primitive structure of reinforced earth in Korean peninsula were found as the earth wall built around the old fort In about 3rd century Modern reinforced earth was introduced to Korea early 1980, and spreaded tremendously through the nation. Among them, not a few reinforced earth walls which were built ignored over all stabilities have been collapsed. In this paper basic concepts, economic benefits, design considerations and future applicable trends of reinforced earth are reviewed in simple manners.

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Effect of Increase in Thickness of Gypsum Board Composite Panel on Improvement in Out-of-plane Drywall Stiffness (석고보드 복합패널의 후판화에 따른 면외방향 내력 증대 효과)

  • Shin, Yun-Ho;Ji, Suk-Won;Choi, Soo-kyung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.05a
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    • pp.14-15
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    • 2019
  • The demand for drywall is increasing as the structural type of apartment building is changing to a rigid frame structure. At present, the thickness of the gypsum board used for drywall is mostly 9.5mm and is required to be changed to 12.5mm to improve the performance of the wall. A structural safety test has been conducted in accordance with KS F 2613 to verify the effect of changing the thickness of the gypsum board to 12.5mm in terms of improvement as to stiffness. As a result of the test, the stiffness of the drywall has increased by about 19.6% and the impact resistance by about 30.4%.

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