(LEAD) Samsung Electronics' union says it will proceed with strike Thurs. | Yonhap News Agency

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(ATTN: ADDS more info throughout)By KIm Han-jooSEOUL, May 20 (Yonhap) -- Samsung Electronics Co.'s union said Wednesday it will proceed with the strike scheduled for later this week, arguing management has rejected a government-mediated proposal."We accepted the mediator's proposal," the company's l