中国商业银行表外业务发展滞后的原因分析

针对中国商业银行表外业务与国际相比发展落后的现状，从两个方面，即商业银行自身是否具有发展表外业务的主观感望和我国现阶段是否具备开展此项业务的客观条件，分析其原因。研究认为，由于目前主客观两方面条件尚未充分具备，导致了表外业务的发展滞后。同时，依据对主客观两方面条件变化的预期，得出了我国银行业有必要也有能力加强表外业务发展的结论。     

Hierarchical model updating strategy of complex assembled structures with uncorrelated dynamic modes

In structural simulation and design, an accurate computational model directly determines the effectiveness of performance evaluation. To establish a high-fidelity dynamic model of a complex assembled structure, a Hierarchical Model Updating Strategy(HMUS) is developed for Finite Element(FE) model updating with regard to uncorrelated modes. The principle of HMUS is first elaborated by integrating hierarchical modeling concept, model updating technology with proper uncorrelated mode treatment, and...     

Trajectory optimisation in electrical discharge machining of three-dimensional curved and twisted channels

Numerical control electrical discharge machining(NC EDM) is one of the most widely used machining technologies for manufacturing a closed blisk flow path, particularly for three-dimensional(3D) curved and twisted flow channels. In this process, tool electrode design and machining trajectory planning are the key factors affecting machining accessibility and efficiency. Herein, to reduce the difficulty in designing the electrode and its motion path in the closed curved and twisted channels, a heur...