Zhidong Yang

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The main objective of a virtual enterprise (VE) is to allow a number of organizations to rapidly develop a working environment to manage a collection of resources contributed by the organizations toward the attainment of some common goals. One of the key requirements of a tirtua.1 enterprise is to develop an information infrastructure to sup port the(More)
For achieving interoperability among heterogeneous computing systems, the Object Management Group (OMG) has adapted the Common Object Request Broker Architecture (CORBA) and the use of an Interface Definition Language (IDL) for specifying object properties and operations which encapsulate the data and programs of heterogeneous systems. This paper describes(More)
China’s coastal wetlands belong to some of the most threatened ecosystems worldwide. The loss and degradation of these wetlands seriously threaten waterbirds that depend on wetlands. The China Coastal Waterbird Census was organized by volunteer birdwatchers in China’s coastal region. Waterbirds were surveyed synchronously once every month at 14 sites, as(More)
Metamodels have been widely used in engineering design to facilitate analysis and optimization of complex systems that involve computationally expensive simulation programs. The accuracy of metamodels is strongly affected by the sampling methods. In this paper, a new sequential optimization sampling method is proposed. Based on the new sampling method,(More)
The main objective of a virtual enterprise (VE) is to allow a number of organizations to rapidly develop a working environment to manage a collection of resources contributed by the organizations toward the attainment of some common goals. One of the key requirements of a virtual enterprise is to develop an information infrastructure to support the(More)
The purpose of shaking tables is to replicate the desired motion to specimen, which needs to ensure not only the synchronization precision of two tables, but the tracking precision for the desired signal. Due to the nonlinearity of system and eccentric of load masses, both tracking and synchronous accuracy are poor. To solve this problem, this article(More)
To improve tracking and synchronization control precision of electro-hydraulic shaking tables system, this paper presents a novel adaptive reaching law sliding mode controller (ARLSMC) for double shaking tables system with parameter uncertainty and disturbance. The ARLSMC combined a sliding mode controller (SMC) based on a novel adaptive reaching law to(More)
In order to improve the accuracy performance of a six degree-of-freedom (DOF) redundantly actuated parallel mechanism (RAPM), a self-calibration method based on sensor redundancy is presented. The kinematic model of the RAPM is built and its 44 identifiable parameters are determined by QR decomposition of the identification matrix. Consequently, the(More)
Methyl methanesulfonate and ethyl methanesulfonate are potential genotoxic impurities in imatinib mesylate. In this work, a simple, sensitive, reliable, and fast gas chromatography with mass spectrometry method for the simultaneous determination of methyl methanesulfonate and ethyl methanesulfonate was developed and validated. Total analysis time was only 7(More)