• Title/Summary/Keyword: Stength

Search Result 63, Processing Time 0.022 seconds

A Study on Properties of UV-Curing Silver Paste by Dispersing Agent Characteristic (분산제 특성에 따른 UV 경화형 Ag Paste의 물성 연구)

  • Son, Min-Jeong;Nam, Su-Yong;Kim, Sung-Bin
    • Journal of the Korean Graphic Arts Communication Society
    • /
    • v.30 no.2
    • /
    • pp.59-68
    • /
    • 2012
  • As one of the eletronic device industries has been developed by using a recent printing method, the consumption of Ag paste has been on the rise as well. The printing method has simple processes in comparison with other methods. Also it enables to be large-scaled and to lower price ranges. If UV curing system would be applied to the printing method, energy consumption and dangerousness from curing system can be minimized in a short period of time so that its method can be more eco-friendly. This study conducted an experiment in order to make UV curing Ag paste which is feasible to implement micro patterns with different dispersing agents. The purpose of the study is to analysis the suitable printability for micro pattern and to test dispersibility, hardening properties, conductivity and adhesive stength by measuring viscosity, TI(thixotropy index), G', G", $tan{\delta}$(G"/G') after making paste. We have experimented with four dispersing agents. After We did an analysis of characteristic of rheology, conductivity and adhesive stength, etc, We confirmed that the paste added FP 3060 has excellent dispersibility, conductivity and adhesive stength. If the paste has excellent dispersibility, we will expect that micro pattern is made by that.

Fatigue Strength for the Non Load Carrying cruciform Welded Joints of High Strength Steel (고강도강 하중비전달형 십자용접연결부의 피로강도)

  • Kim, Sung Hoon;Bae, Doo Byong;Choi, Jun Hyeok
    • Journal of Korean Society of Steel Construction
    • /
    • v.14 no.3
    • /
    • pp.453-461
    • /
    • 2002
  • This study investigated the fatigue stength of non-load carrying cruciform welded joints, which was maunfactured using the SM570 and POSTEN80 high strengh steel. Factors such as fatigue strength, fatigue crack initiation and propagation, thickness effect, and the relatioinship between the static strength and the fatigue strength were examined and compared with previous fatigue testing results. Results showed that the fatigue strength of SM570 and POSTEN80 steel are higher than the grade represented on the design specification. It is also identified the size effect and the dependence of the static stength in a few cases.

Study on the Mix Design Method and the Mechanical Proerties of High-Strenght Lightweight Concrete (고강도-경량콘크리트의 배합설계 방안 및 역학적 특성에 관한 연구)

  • Gang, Hun
    • 레미콘
    • /
    • no.7 s.72
    • /
    • pp.29-41
    • /
    • 2002
  • The purpose of this study is to investigarte the mix design method and the mechanical properties of High stength Lightweight Concrete (HSLC). In the experment, concrete mixing was conducted to select the optimum mix design for HSLC in laboratory. Also, concrete mixing in ready mix design. As a result, it is possible to establish the mix design of HSLC according to the using these experimental results ;the estimate equation for unit weight of HSLC. the relationship between W/C and compressive strength of HSLC and the fluidity of HSLC in the view of workability

  • PDF

Effect of Autogenous Shrinkage on Shrinkage behavior in High Stength Concrete (자기건조수축을 고려한 고강도 콘크리트의 수축변형 특징에 관한 연구)

  • Paek, Nak-Seung;Cha, Soo-Won;Lee, Seong-Cheol
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2006.05b
    • /
    • pp.429-432
    • /
    • 2006
  • The shrinkage mechanism of high strength concrete is different from that of normal concrete. The shrinkage of normal concrete is subjected to evaporate moisture in concrete, but most shrinkage in high strength concrete is caused by chemical reaction. To analyze shrinkage of concrete exactly, it is necessary to divide drying shrinkage with autogenous shrinkage in terms of degree of hydration, especially in concrete with low W/C ratio. The proposed method can provide a rational basis for prediction of shrinkage in high strength concrete structure.

  • PDF

Modular Design of Analog Hopfield Network (아날로그 홉필드 신경망의 모듈형 설계)

  • Dong, Sung-Soo;Park, Seong-Beom;Lee, Chong-Ho
    • Proceedings of the KIEE Conference
    • /
    • 1991.11a
    • /
    • pp.189-192
    • /
    • 1991
  • This paper presents a modular structure design of analog Hopfield neural network. Each multiplier consists of four MOS transistors which are connected to an op-amp at the front end of a neuron. A pair of MOS transistor is used in order to maintain linear operation of the synapse and can produce positive or negative synaptic weight. This architecture can be expandable to any size neural network by forming tree structure. By altering the connections, other nework paradigms can also be implemented using this basic modules. The stength of this approach is the expandability and the general applicability. The layout design of a four-neuron fully connected feedback neural network is presented and is simulated using SPICE. The network shows correct retrival of distorted patterns.

  • PDF

Deformation Behavior and Reinforcement Design of a Tunnel Excavated in Weak Rock by the NATM (연약암반에 굴착되는 NATM 터널의 변형거동과 보강설계)

  • 서영호;이정인
    • Tunnel and Underground Space
    • /
    • v.3 no.2
    • /
    • pp.132-141
    • /
    • 1993
  • Laboratory and field tests were performed to find out the effectiveness of ground improvement by grouting for an urban subway tunnel that was excavated in weak rock by the NATM. Field measurements were carried out to monitor the behavior of rock mass around the tunnel and to ensure the validity of the current design of the distance form the measuring points to the tunnel face. The final converged displacement and the peroid were predicted using the gamma function. It was found that the ground improvement in terms of reduced permeability and increased stength in the self-supportability of the excavation face enabled the NATM applied in poor gorund. As the result of applying the gamma function to the predicting of displacement, the final displacement including the preceding one and the converged period could be approximately predicted at the early excavation stage.

  • PDF

Shear Behavior of High and Low Strength Reinforced Concrete Beams with Web Reinforcement (전단철근이 있는 고강도와 보통강도 철근콘크리트보의 전단거동에 관한 실험적 연구)

  • 이영재;최정우;박찬규;신길윤;서원명
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1995.04a
    • /
    • pp.331-338
    • /
    • 1995
  • Results of an experimental of the shear and flexures strength of doubly reinforced concrete beams were summarized. A total of 24 beams was tested; 4 without web reinforcement and 20 with web reinforcement in the form of vertical stirrups. Main variables were compressive strength of concrete which was 26.88MPa and 63.4MPa, spacing of stirrups which was no-stirrups, 200, 150, 120, 100 and 90mm. Tests results were compared with stength predicted using the equations of ACI 318-89. The shear reinforcement ratio of the beams, which failed simultaneously under both flexures and shear, were 0.66pvmax for low strength concrete beams and 0.56pvmax for high strength concrete beams, respectively. Thus, ACI equations for shear reinforcement were very conservative.

  • PDF

COMPARATIVE STUDY ON THE INTERPOLATION METHODS FOR THE AEROELASTIC ANALYSIS (공탄성 해석을 위한 보간 기법 비교 연구)

  • Lee, Jae-Hun;Kwon, Jang-Hyuk
    • 한국전산유체공학회:학술대회논문집
    • /
    • 2005.10a
    • /
    • pp.141-144
    • /
    • 2005
  • The fluid-structure interaction analysis such as a static aeroelastic analysis requires the result of each analysis as an input to other analysis. Usually the grids for the fluid analysis and the structural analysis are different, so the results should be transformed properly for each other. The Infinite Plate Spline(IPS) and the Thin Plate Spline(TPS) are used in interpolating the displacement and the pressure. In this study, such interpolation methods are compared with kriging which provides a precise response surface. The static aeroelastic analysis is performed for the supersonic flow field with shock waves and the pressure field is interpolated by the TPS and kriging. The TPS shows tendency to weaken the shock stength, whereas kriging preserves the shock strength.

  • PDF

Mechanical Properties of High Stength Sheet Steels for Auto-Body by Induction Heat Treatment (고주파열처리에 의한 자동차용 고강도 강판의 기계적 성질변화)

  • Lee, D.H.;Yoon, C.S.;Lim, J.D.
    • Journal of the Korean Society for Heat Treatment
    • /
    • v.17 no.2
    • /
    • pp.73-77
    • /
    • 2004
  • The efforts which increase the strength of the auto-body structure and decrease its weight lead to develop a new concept of part production systems, such as Post-Form Strengthening by induction heat treatment. In this study, several cold and hot-rolled sheet steels were used to find out optimum induction heat treatment conditions. After induction heat treatment, strength of heat-treated sheet steels was increased significantly compared with that of as-rolled steels. From these results, auto-body structure which has more light and safe has been made by using this induction hardening method.

A Study on the Integrated Methodology for Constructing the Cellular Manufacturing System (셀생산시스템의 통합적 구축방법론에 관한 연구)

  • 김효석;정윤호
    • Korean Management Science Review
    • /
    • v.16 no.1
    • /
    • pp.173-186
    • /
    • 1999
  • Recently many firms are introducing the cellular manufacturing system(CMS) as a means of achieving manufacturing efficiencies. However, most of the research on CMS was mainly for determining the cell formation problems. Since the goal of the CMS is not only a increase production efficiencies, but also to enhance the competitive stength of a firm, it would be reasonable to assume CMS as a business reengineering module rather than an independent technique. The purpose of this study is to align the CMS with reengineering, to present an integrated methodology for constructing the CMS, and to apply the CMS to a firm and verify it. The paper concludes with a brief description of the lessons learend by the CMS project and the limitations of the research are described.

  • PDF