摘要：Design of a robust production facility layout with minimum handling cost （MHC） presents an appropriate approach to tackle facility layout problems in a dynamic volatile environment, in which product demands randomly change in each planning period. the objective of the design is to find the robust facility layout with minimum total material handling cost over the entire multiperiod planning horizon. this paper proposes a new mathematical model for designing robust machine layout in the stochastic dynamic environment of manufacturing systems using quadratic assignment problem （QAP） formulation. In this investigation, product demands are assumed to be normally distributed random variables with known expected value, variance, and covariance that randomly change from period to period. the proposed model was verified and validated using randomly generated numerical data and benchmark examples. the effect of dependent product demands and varying interest rate on the total cost function of the proposed model has also been investigated. sensitivity analysis on the proposed model has been performed. Dynamic programming and simulated annealing optimization algorithms were used in solving the modeled example problems.

摘要：A new spherical torus called VEst （Versatile Experiment spherical torus） is designed, constructed and successfully commissioned at seoul National University. A unique design feature of the VEst is two partial solenoid coils installed at both vertical ends of a center stack, which can provide sufficient magnetic fluxes to initiate tokamak plasmas while keeping a low aspect ratio configuration in the central region. According to initial double null merging start-up scenario using the partial solenoid coils, apprdpriate p6wer supplies for driving a toroidal field coil, outer poloidal field coils, and the partial solenoid Coils are fabricated and successfully commissioned. For reliable start-up, a pre-ionization system with two cost-effective homemade magnetron power supplies is also prepared. In addition, magnetic and spectroscopic diagnostics with appropriate data acquisition and control systems are well prepared for initial operation of the device. the VEst is ready for tokamak plasma operation by completing and commissioning most of the designed components.

摘要：由API建议的冲剪要求是近海结构管节点设计的一项重要衡准。现行的计算冲剪力方程基本上是轴向应力和最大弯曲应力的组合,不区分面内弯曲应力和面外弯曲应力。维果,存计算冲剪应力时,在某些情况下是低估了。另一方面。

摘要：精密锻造齿轮在原材料利用和提高生产率方面与机加工齿轮相比有比较明显的优点。精密镊造锥齿轮已应用在汽车齿轮差速器，并拥有很高的可靠性。另一方面，仍继续研究提高精度和扩大应用范围。本文介绍了差速器齿轮的整个精密模锻过程，从模具设计、冷锻到热处理。镀模的应力和弹性变形的确定借助于有限元分析软件。通过应变测量模具的实际弹性变形。本研究中模具的弹性变形达到1mm。模具尺寸的定量分析利用了经模的CAD／CAM数据。