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31. Based on the analysis of the PKM Architecture and the overall network-based security control system, this paper brings for Nard the authority management model for the data security of the PDM system.

32. So far as efficiency and distortion are concerned, the transistorized pulse-duration modulator by PANTEL method is proved to be superior to that by the basic PDM circuit.

33. As the product development engineering information system and integration environment, PDM have had many positive effects in the past implementations and applications.

34. Firstly, the information security problems of checkup workflow in PDM are discussed.