• Title, Summary, Keyword: End effect

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과업의 불확실성이 최종사용자컴퓨팅 특성과 최종사용자의 만족도에 미치는 영향

  • 김창기;이진주
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • pp.329-338
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    • 1993
  • The main objective of this paper is analyzing the effects of task uncertainty on EUC characteristics and end user satisfaction. Task uncertainty were identified as an important determinant of EUC characteristics. And the moderating effect of task uncertainty on the relationship between EUC characteristics and end user satisfaction was suggested. A field study was undertaken to test the hypothesized relationships among task uncertainty, EUC characteristics, and end user satisfaction Data were collected from 138 end-user of 19 Korean business organizations. The empirical results indicated that task uncertainty was significantly related to EUC characteristics and that task uncertainty had significant effect on the relationship between EUC characteristics and end user satisfaction. Implications and future research directions are drawn for the management of EUC and for further research on EUC.

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Effect of Dowel Diameters affecting to Withdrawal Strength of Wood and Wood-Based Material Joints (Dowel직경(直徑)이 목재(木材)와 목질재료(木質材料) 접합부(接合部)의 인발강도에 미치는 영향(影響))

  • Lee, Phil-Woo;Oh, Sei-Chang;Park, Hee-Jun
    • Journal of the Korean Wood Science and Technology
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    • v.18 no.2
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    • pp.79-85
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    • 1990
  • Traditional complex joints have used to a wide variety of wooden furniture construction. Dowel joint is the most popular joint s. However design of this joint to meet specified service condition has been hampered by a lack of proven design formulas which can be use to predict their strength. The object of this study is to investigate the withdrawal strength and effect of dowel diameters in wood and wood based materials. The obtained results were as follows; 1. The relationship between withdrawal strength and dowel diameter is found to be linear. 2. Withdrawal strength of medium density fiberboard and Sepetir in end-to-side joints is superior to Antiaris, particleboard and plywood. 3. In end-to-end joints, withdrawal strength of medium density fiberboard is the most superior joint. but Sepetir. Antiaris and plywood have similarly strength and particleboard is inferiority. 4. Withdrawal strength in end-to-end joints of Antiaris and plywood is higher than in end-ta-side joints. But in end-to-end joints of Sepetir. medium density fiberboard and particleboard is similarity in end-to-side joints.

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Characteristic Analysis of a Linear Induction Motor considering Static and Dynamic End Effect (정적 및 동적 단부효과를 고려한 선형유도전동기의 특성 해석)

  • Kim, Dae-Kyong;Kwon, Byung-Il;Woo, Kyung-Il
    • Proceedings of the KIEE Conference
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    • pp.981-983
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    • 2000
  • Linear induction motors have static and dynamic end effects due to its finite core length, so that per-phase impedances are asymmetric and the air gap flux distribution is distorted. Because of these points the d-q equivalent circuit model considering both end effects has not been exactly completed. So this paper proposes a characteristic analysis method considering both static and dynamic end effect of the LIM. This method is to utilize asymmetric d-q equivalent circuit model with dynamic end effect coefficient. As a result, it is shown that the simulation results have a good agreement with experimental ones.

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Effect of Compounding Electrolytic Machining in Ball End Milling (볼엔드밀 절삭가공에서 전해복합의 효과)

  • 주종길;박규열
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1025-1028
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    • 2001
  • In this report, a new method compounding the electrolytic machining with ball end milling process to increase the machining efficiency was introduced. From the experimental result, it was confirmed that effect of cutting force reduction and finer surface roughness can be obtained in a certain condition of ball end milling and electrolytic machining conditions.

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The Effect of TiAlN coated Ball End Mill on Cutting characteristic of High Hardness Steels in Dry Condition (초경 볼 엔드밀의 TiAlN 코팅 처리조건이 건식가공환경에서 고경도 강재의 절삭 특성에 미치는 영향)

  • Park D. S.;Won S. T.;Lee Y. J.;Hur J. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.344-349
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    • 2005
  • This paper is studied on the effect of TiAlN coated ball end mill on cutting characteristic of high hardness steels in dry cutting condition without coolant. KP4 steels[HRC32] and STD11[HRC60] heat treated steels wert: used as the workpiece and WC-Co ball end mill and single and multi layer TiAlN coated ball end mill were utilized. Results showed that TiAlN coated ball end mill were increased the cutting length than WC-Co ball end mill in the cutting speed$[245\~320m/min]$ about $2\~5$ times for KP4 steels and about $2.7\~4.3$ times for STD11 heat treated steels. The multi layer TiAlN coated ball end mill is good about $1.2\~1.7$ times for KP4 steels and STD11 steels than single layer coated.

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Verification of 1-d direct solution for longitudinal end effect occurred in linear induction motor by using 2-d FEM (2차원 유한요소해석을 통한 선형 유도전동기의 종방향 단부효과 고려를 위한 1-d direct solution의 검증)

  • Lee, Sung-Gu;Ham, Sang-Hwan;Lee, Hyung-Woo;Lee, Ju
    • Proceedings of the KSR Conference
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    • pp.978-983
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    • 2009
  • This paper analyzed longitudinal end effect occurred in linear induction motor by using I-d direct solution and its result is verified by 2-d Finite Element Method(FEM). Longitudinal end effect of linear induction motor caused by magnetic discontinuity in primary core and electric discontinuity in armature winding has been investigated by many researchers. In this paper, 1-d direct solution and boundary conditions proposed by Yamamura and Nasar is used to analyze end effect of linear induction motor and its solution is verified by 2-d FEM.

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The Effect of TiAlN coated Ball End Mill and MQL Cutting Condition on Cutting characteristic of High Hardness Steels (고경도 강재의 MQL 가공시 초경 볼 엔드밀의 TiAlN 코팅 조건이 절삭 특성에 미치는 영향)

  • Park D. S.;Won S. T.;Lee Y. J.;Hur J. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.245-251
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    • 2004
  • This paper is studied on the effect of TiAlN coated Ball End Mill and MQL(Minimum Quantity Lubrication) cutting condition on cutting characteristic of high hardness steels. KP4 steels[HRC32] and STD11[HRC60] heat treated steels were used as the workpiece and WC-Co ball end mill and single and multi layer TiAlN coated ball end mill were utilized in the cutting tests. MQL device was used to spray botanical oil coolant. Result showed that TiAlN coated ball end mill were increased the cutting length than WC-Co ball end mill in the cutting speed[$245{\sim}320m/min$] about $2.3{\sim}5.7$ times for KP4 steels and about $2.5{\sim}4.3$ times far STD11 heat treated steels. The multi layer TiAlN coated ball end mill is good for KP4 steels than single layer coated.

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The effect of internal axial forces of a cantilever beam with a lumped mass at its free end

  • Zhang, Jinfu
    • Coupled systems mechanics
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    • v.7 no.3
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    • pp.321-331
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    • 2018
  • When a cantilever beam with a lumped mass at its free end undergoes free transverse vibration, internal axial forces are produced in the beam. Such internal axial forces have an effect on free transverse vibration of the beam. This effect is studied in this paper. The equations of motion for the beam in terms of the generalized coordinates including the effect are derived. The method for determining free transverse vibration of the beam including the effect is presented. In numerical simulations, the results of free transverse vibration of the free end of the beam including and not including the effect are obtained. Based on comparison between the results obtained, the conclusions concerning the effect are given.

Simulation of surface profile using accelerometer in high speed end milling (고속 엔드밀 가공시 가속도계를 이용한 표면형상 시뮬레이션)

  • 이기용
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.321-325
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    • 2000
  • To obtain precise surface and high productivity, high speed end milling has been studied recently. Though high speed end milling is explicitly effective for precision surface generation geometrically, tool deflection, chatter vibration and frequency characteristics of end milling system deteriorate the theoretical surface. In this study, simulation algorithm and programming method are suggested to simulate machined surface using acceleration signal in high speed end milling. This simulation is conducted by considering vibrational effect of spindle system which was not considered by other researchers. Between simulated results and experiment results, good agreements were obtained.

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