• Title/Summary/Keyword: heterogeneous

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Adhesive Fracture Characteristic of DCB Specimen due to Single and Heterogeneous Materials under Tearing Load (찢김 하중에서 단일 재료 및 이종 접합 재료에 따른 이중외팔보 시험편의 접착제 파손 특성)

  • Kim, Jae-Won;Cho, Jae-Ung
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.4
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    • pp.127-134
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    • 2021
  • In this study, the adhesive fracturing characteristics of a DCB specimen due to single and heterogeneous bonding materials under tearing load was investigated. The experiments were conducted to examine the fracturing properties of the adhesive DCB specimen. As an experimental condition, a forced displacement of 3mm/min was applied to one side while the other side was fixed. As a result of the experiment, it was found that the AL6061-T6 material was superior to the CFRP material in terms of maximum stress, specific strength, and energy release rate when compared to the adhesive fracturing property of a single material. We tested CFRP-AL, a heterogeneous bonding material, and compared its experimental results to the results from the single materials. Based on these results, CFRP-AL with a heterogeneous bonding material was observed to have the superior structural safety compared to single materials for the mode III fracture type.

Electrical and Mechanical Properties of Epoxy/Heterogeneous Inorganic Composites Materials for the Application of Electric Power GIS Appliances (친환경 GIS용 전력기기의 적용을 위한 에폭시 이종무기물 복합재료의 전기적, 기계적 특성)

  • Park, Jae-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.12
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    • pp.1633-1640
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    • 2018
  • Epoxy resin is a polar thermosetting polymer that is widely employed in different branches of industry and everyday life, due to their stable physical and chemical properties. Of all the polymer materials currently being used in the electrical insulation industry, epoxy resin is the most widely used kind, chosen as the base polymer material in the present study. Composites were prepared according to the mixing ratio (MS: MA, 1: 9, 3: 7, 5: 5, 7: 3, 9: 1)of mixture for Heterogeneous Minerals(Micro Silica:MS, Micro Alumina:MA) (MS+MA). We have investigated for AC electrical insulation breakdown characteristics and the dielectric properties (permittivity, dielectric loss, and conductivity) with frequency changes. The electrical AC insulation breakdown performance was improved with the increase of the mixing ratio of MS according to heterogeneous mineral material mixture(MS+MA). As Dielectric properties, the dielectric constant and dielectric loss increased with decreasing frequency and decreased with increasing MS content ratio of heterogeneous mineral mixture. Tensile strength and flexural strength according to the mixing ratio (MS + MA) of epoxy / heterogeneous mineral mixture were studied by mechanical properties. The performance of mechanical tensile and flexural strength was significantly improved as the fill contents ratio of MS increased.

Design and implementation of a dynamic management method for heterogeneous RFID/USN devices (이기종 RFID/센서 디바이스 동적관리를 위한 방법 설계 및 구현)

  • Kim, Hyu-Chan;Soh, Seok-Yong;Koh, Wan-Ki;Yang, Moon-Seok
    • Journal of the Korea Society of Computer and Information
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    • v.14 no.7
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    • pp.143-150
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    • 2009
  • Recently "Green IT" technology has been attracting public attention that the Ministry of Environment has come up with new plans to make "low carbon and green growth" technology and to promote u-City industries. Making an offer, Uubiquitous Service needs RFID/USN Middleware to handle heterogeneous RFID/USN devices in order to gather existing informations. In this paper, we propose the design and implementation of a dynamic management method for heterogeneous RFID/USN devices. In compliance with the paper I will furnish Uubiquitous Service regarding existing circumstances by handling heterogeneous RFID/USN devices such as new RFID/Sensor devices addition and deletion and so on.

Energy and Performance-Efficient Dynamic Load Distribution for Mobile Heterogeneous Storage Devices (에너지 및 성능 효율적인 이종 모바일 저장 장치용 동적 부하 분산)

  • Kim, Young-Jin;Kim, Ji-Hong
    • Journal of the Korea Society of Computer and Information
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    • v.14 no.4
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    • pp.9-17
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    • 2009
  • In this paper, we propose a dynamic load distribution technique at the operating system level in mobile storage systems with a heterogeneous storage pair of a small form-factor and disk and a flash memory, which aims at saving energy consumption as well as enhancing I/O performance. Our proposed technique takes a combinatory approach of file placement and buffer cache management techniques to find how the load can be distributed in an energy and performance-aware way for a heterogeneous mobile storage air of a hard disk and a flash memory. We demonstrate that the proposed technique provides better experimental results with heterogeneous mobile storage devices compared with the existing techniques through extensive simulations.

Formalization of Adsorption Isotherm for Heterogeneous Surface (Heterogeneous 표면 흡착등온식의 형식화)

  • Kim, Cheol-Ho;HwangBo, Seung
    • Proceedings of the KIEE Conference
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    • 2001.11a
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    • pp.288-289
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    • 2001
  • 흡착열공간분포를 외형적으로 포함하는 Heterogeneous 표면상의 흡착등온식을 형식화한다 그리고 흡착열공간분포는 위치에 대한 주기함수로서 주어지는 것임을 논한다. 본 논문에서 얻어진 결과를 재료의 박막형성 문제에 결부시켜 논의한다.

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INCOMPRESSIBLE NAVIER-STOKES EQUATIONS IN HETEROGENEOUS MEDIA

  • Pak, Hee Chul
    • Journal of the Chungcheong Mathematical Society
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    • v.19 no.4
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    • pp.335-347
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    • 2006
  • The homogenization of non-stationary Navier-Stokes equations on anisotropic heterogeneous media is investigated. The effective coefficients of the homogenized equations are found. It is pointed out that the resulting homogenized limit systems are of the same form of non-stationary Navier-Stokes equations with suitable coefficients. Also, steady Stokes equations as cell problems are identified. A compactness theorem is proved in order to deal with time dependent homogenization problems.

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Semantic Correspondence of Database Schema from Heterogeneous Databases using Self-Organizing Map

  • Dumlao, Menchita F.;Oh, Byung-Joo
    • Journal of IKEEE
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    • v.12 no.4
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    • pp.217-224
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    • 2008
  • This paper provides a framework for semantic correspondence of heterogeneous databases using self- organizing map. It solves the problem of overlapping between different databases due to their different schemas. Clustering technique using self-organizing maps (SOM) is tested and evaluated to assess its performance when using different kinds of data. Preprocessing of database is performed prior to clustering using edit distance algorithm, principal component analysis (PCA), and normalization function to identify the features necessary for clustering.

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Torsional analysis of heterogeneous magnetic circular cylinder

  • Zenkour, Ashraf M.
    • Steel and Composite Structures
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    • v.17 no.4
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    • pp.535-548
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    • 2014
  • In this paper, the exact closed-form solutions for torsional analysis of heterogeneous magnetostrictive circular cylinder are derived. The cylinder is subjected to the action of a magnetic field produced by a constant longitudinal current density. It is also acted upon by a particular kind of shearing stress at its upper base. The rigidity of the cylinder is graded through its axial direction from one material at the lower base to another material at the upper base. The distributions of circumferential displacement and shear stresses are presented through the radial and axial directions of the cylinder. The influence of the magnetostrictive parameter is discussed. The effects of additional parameters are investigated.

Comparision of Hypothesis Tests and Interval Estimations for Homogeneous and Heterogeneous Populations (동질성 및 이질성 모집단의 가설검정과 구간추정의 비교)

  • Choi, Sung-Woo
    • Proceedings of the Safety Management and Science Conference
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    • 2009.04a
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    • pp.365-370
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    • 2009
  • The present study proposes the various hypothesis tests and interval estimations for homogeneous and heterogeneous populations in the continuous and discrete process. These results can be used to complement the QC story 15 steps for quality improvement circle and DMAIC processes for six sigma innovation.

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Continuous Pretilt Control Using Heterogeneous Polyimide Mixture

  • Kim, Young-Ki;Gwag, Jin-Seog;Jo, Soo-In;Kim, Jae-Hoon
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.1584-1587
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    • 2008
  • We proposed a technique controlling continuously pretilt angle in full range with high process margin. The proposed method is characterized by tuning thickness of heterogeneous polyimide (PI) layer that homeotropic PI is mixed with planar PIs.

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