並前往http://ir.lib.ntust.edu.tw/bitstream/987654321/35544/1/A%20STUDY%20OF%20TEST%20METHOD%20FOR%20ABSORPTION%20COEFFICIENT%20OF%20MATHERIAL%20THROUGH%20CROSS-CORRELATION%20IN%20AN%20ANECHOIC%20CHAMBER%20%E2%80%93%20THE%20POROUS%20PLANE%20MATERIALS%20AS%20EXAMPLE.pdf