The authors regret to inform that several operation symbols of Eq. (3) and the following sentences are mistaken due to clerical errors.
1. Eq. (3)
should be changed to:
.
2. “Then the trapezoidal time function of this time interval is
where r is the preset buffer time in this time interval”should be changed to: “Then the trapezoidal time function of this time interval is
,where r is the preset buffer time in this time interval” in the second sentence following the Eq. (3).
The authors would like to apologize for any inconvenience caused.
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