• Title/Summary/Keyword: and hood

Search Result 395, Processing Time 0.028 seconds

A new record of Haplodrassus nojimai Kamura, 2007 (Araneae, Gnaphosidae) from Korea

  • Kim, Seung Tae;Yoo, Jung Sun
    • Korean Journal of Environmental Biology
    • /
    • v.39 no.1
    • /
    • pp.16-18
    • /
    • 2021
  • Haplodrassus nojimai Kamura, 2007 of Gnaphosidae, which is only known in Japan was newly described in Korea with measurements and morphological illustrations. A female was collected from the levee of rice fields using a pitfall trap. The female epigynum has thick and remarkable transverse wrinkles and is densely covered with long blackish-gray hairs. The anterior hood was slightly rounded and the lateral margins were relatively short. The median septum was V-shaped with a broad base on the median part, and a pair of spermathecae was visible. The male is still unknown.

Weight Reduction Design and the Applications (하중 감량 설계와 적용)

  • Lee, Jeong-Ick
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.16 no.3
    • /
    • pp.8-14
    • /
    • 2007
  • The geometry in the weight reduction design is very required to be started from the conceptual design with low cost, high performance and quality. In this point, a topological shape fur optimization concerned with conceptual design of structure is important. The method used in this paper combines three optimization techniques, where the shape and physical dimensions of the structure and material distribution are hierachically optimized, with the maximum rigidity of structure and lightweight. As the applications, the technology of weight reduction design is applied on designs of aluminum control arm and inner panel of hood.

Effect of Temper Rolling on Formability and Baking Hardenability in Baking Hardenable Steels for Auto Body Outer Panel (자동차 외판용 BH강판에서 성형성과 소부경화성에 미치는 조질압연의 영향)

  • Ko H. S.;Moon M. B.;Shin C. S.;Oh H. W.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2004.08a
    • /
    • pp.37-44
    • /
    • 2004
  • Automotive company has been endeavoring to develop high strength steels to get higher fuel efficiency of car since the oil shortage in 1970s and to cope with the recent strict environmental regulation. Outer panels(Hood, Roof, Door and Fender) for automobile require higher dent resistance. Bake-hardenable(BH) steels are known as useful for their high deep drawability and high dent resistance. Recently BH steels are increasingly adapted for outer panel use due to their high drawability and high dent resistance. In this study effect of temper rolling on formability (textures, r value) and bake hardenability is investigated fur improving characteristic of bake-hardenable steels.

  • PDF

Connection Frequency Buffer Aware Routing Protocol for Delay Tolerant Network

  • Ayub, Qaisar;Mohd Zahid, M. Soperi;Abdullah, Abdul Hanan;Rashid, Sulma
    • Journal of Electrical Engineering and Technology
    • /
    • v.8 no.3
    • /
    • pp.649-657
    • /
    • 2013
  • DTN flooding based routing protocol replicate the message copy to increase the delivery like hood that overloads the network resources. The probabilistic routing protocols reduce replication cost by forwarding the message to a node that holds high predictability value to meet its destination. However, the network traffic converges to high probable nodes and produce congestion that triggers the drop of previously stored messages. In this paper, we have proposed a routing protocol called as Connection frequency Buffer Aware Routing Protocol (CFBARP) that uses an adaptive method to maintain the information about the available buffer space at the receiver before message transmission. Furthermore, a frequency based method has been employed to determine the connection recurrence among nodes. The proposed strategy has performed well in terms of reducing message drop, message relay while increases the delivery probability.

A Research Framework for the Success Factors of Information

  • Yoo, Sangjin;Soongoo, I-Iong
    • Journal of Korea Society of Industrial Information Systems
    • /
    • v.3 no.1
    • /
    • pp.117-139
    • /
    • 1998
  • This study is intended to identify the factors affecting the successful information warehouse (IW) implementation through the technology acceptance model. As the IW has played an important role with the organizations, it has become a strategic management tool. However, because the building of an IWS requires a great amound of financing and a multi-period, managers should consider identifying the variables as a predictor of IWS success. The related research areas, such as TAM , TRA, and innovation diffusion theory, and previous research associated with the EWS success factors are reviewed in this paper. Based on the hypotheses presented , the study will empirically test the relationships between six external variable-user involvement, computer self-efficacy, OLAP characteristics, problem difficulty , user training and top management support-and system utilization via user's perceptions of ease of use, unusefulness. This study semmes to be a first attempt in this research area, and its results will provide general guidclines for IWS project managers to enhancement the like hood of system succes.

A Study on the Design of Hemming Process for Automotive Body Panels (자동차 패널의 헤밍 공정 설계에 관한 연구)

  • 안덕찬;이경돈;인정제;김권희
    • Transactions of Materials Processing
    • /
    • v.9 no.6
    • /
    • pp.624-630
    • /
    • 2000
  • Typical automotive opening parts, i. e. hood trunk lid and door, are made through the press operations such as drawing, trimming, flanging, and hemming. The dimensional accuracy of stamped panels is mainly dependent on the drawing operation. However, the gap between outer panels and opening parts, which is important to the appearance quality of the assembled body, is directly influenced by the flanging and hemming operation. In this study, the relation between the design parameters of the hemming operation and the defect of roll-in is shown. The effects of some design parameters on the gap are examined using CAE. furthermore, the simulated results of the hemmed part of tailgate comer are shown and discussed.

  • PDF

Development and application of FEM/GEM program for evaluating formability of stamping dies (스탬핑 금형의 성형성 평가를 위한 유한요소/기하학힘평형법 프로그램 개발과 응용)

  • Kim, J.P.;Keum, Y.T.
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.13 no.3
    • /
    • pp.80-93
    • /
    • 1996
  • A 2-dimensional FEM/GEM program was developed under the plane strain assumption using linear line elements for analyzing stretch/draw forming operations of an arbitrarily shaped draw-die. FEM formulation adopted a new algorithm for solving force equilibrium as well as non-penetration condition simultaneously. Also, a rigid-viscoplastic material model with Hill's normal anisotropic yield condition and rate-sensitive hardening law is assumed, along with the Coulomb friction law in the contact regions. For the case of numerical divergence at nearly final forming stages, geometric force equilibrium method(GEM) is also introduced. The developed program was tested by simulating the forming processes of cylindrical punch/open die, and the drawing processes of automotive oilpan and hood inner panel in order to verify the usefulness and validity of FEM/GEM formulation. The numerical simulation verified the validity and robustness of developed program.

  • PDF

THE FAILURE RATE AND LIKELIHOOD RATION ORDERINGS OF STANDBY REDUNDANT SYSTEMS

  • Choi, In-Kyeong;Kim, Gie-Whan
    • Journal of applied mathematics & informatics
    • /
    • v.5 no.1
    • /
    • pp.41-50
    • /
    • 1998
  • There are various notions of partial ordering between life-times of systems; stochastic ordering failure rate ordering and likeli-hood ration ordering. In this paper we show that for series systems with non i.i.d. exponential lifetimes of components standby redundancy at component level is better than that at system level in failure rate or-dering and likelihood ratio ordering. We also demonstrate that for 2-component parallel systems with i.i.d. exponential lifetimes of com-ponents standby system redundancy is better than standby component redundancy in failure rate ordering and likelihood ratio ordering.

3-Dimensional Finite Element Analysis of Hemming for Automotive Outer Panels by Part Model Assembling Method (부분모델 합성법을 이용한 자동차 외판의 헤밍 공정에 대한 3차원 유한요소해석)

  • 김헌영;임희택;김형종;이우홍;박춘달
    • Transactions of Materials Processing
    • /
    • v.13 no.2
    • /
    • pp.115-121
    • /
    • 2004
  • Hemming is the last farming process in stamping and determines external quality of automotive outer panels. Few numerical approaches using 3-dimensional finite element model have been applied to a hemming process due to small element size which is needed to express the bending behavior of the sheet around small die comer and comparatively big model size of automotive opening parts, such as side door, back door and trunk lid etc In this study, part model assembling method is suggested and applied to the 3-dimensional finite element simulation of flanging and hemming process far an automotive front hood.