Department;
of;
Mathematics,;
Tsing;
Hua;
University,;
Hsinchu;
30043,;
China;
Department;
of;
Mathematics,;
Tsing;
Hua;
University,;
Hsinchu;
30043,;
China;
LMAM,;
School;
of;
Mathematical;
Sciences,;
Peking;
University,;
Beijing;
100871,;
China;
descriptor; linear; periodic; system,; pole; assignment,; proportional; and; derivative; feedback,; numerical; method,; periodic; Schur; decomposition.;