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From the perspective of the characteristics of the elevator group control system, this paper selects the shortest distance algorithm as a scheduling strategy, and constructs elevator running model. On this basis, this paper uses VC++6.0 as development platform, by adding SQL server database as the background, using multi-threaded, dynamic allocation of memory and other technology to build an elevator group control system simulation platform. The platform is verified through a large number of simulation data based on the actual operation of the acquisition, whose results show the feasibility, stability and the superiority of the programmer.

A measurement system based on open-ended coaxial probe technique is set up to characterize the EM properties of radar-absorbing material situ. Frequency-varying method (FVM), which simultaneously extracts complex EM-parameters, i.e. /spl epsiv/ and /spl mu/, by intentionally varying the test frequency to obtain two different reflections, is further studied with an emphasis on several key techniques. Criterions for a right order of the interpolation polynomial used to approximate the frequency-dependent EM-parameters; measures to reduce the residual mismatch errors in reflection measurements and to suppress the ambiguities in solving the transcendent equation system are discussed in detail. Several typical radar-absorbing coatings are measured via FVM and the good results validate the feasibility of this in-situ measurement technique.