VU VAN THE, TRAN BA TTNH Phuong phflp dl:\nh gii du&i dich chnyen du ciia ciic c6ng trinh cli'ng deo chju tii trqng dOng a:a duqc cho trong [!, 2]. Nhilm m& r¢ng khii nang stt d~ng cua cac phuong

. DUNG PHUO'NG PHAP DANH G!A DUO'l G'IAI 'BAI T&AN VO TR{} CtrNG -DEO. CHJU T AI TR()NG [1, 7,8, 9] cUng dii quan tam aiai quylt blli loan dy. GAn day Mng' vi¢c dtra vAo die tmirng d¢ng cbo r'''P l:j, U;,-m¢1 pblf"'nii'Phip dllnh gia miYi dll dtrgc d tra ra ! I] ,.a dA duqc irn!! m~ng d~ giai bai toan ban trbn[~J. Tt·ong, Hi nily

In this work comparisons are made between lower bound obtaining in [3], stronger and lower bound by The-Sawczuk. Finally the optimal problem is considered, namely that it must be chosen fi1(t) fi2 (xk), for which a lower bound displacement is maximized.

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