public void stu_logout(Member loginmem) throws Exception{
		System.out.println("α׾ƿ Ͻðڽϱ?(Y/N)");
		scan.nextLine();
		String logout = scan.nextLine();
		if(logout.equals("Y"))
		{
			show_menu(); //α׾ƿ ʱȭ ư.
		}
		else if(logout.equals("N"))
		{
			student_menu(loginmem);
		}
	}