24.12.2014 Views

Earthquake Engineering Research - HKU Libraries - The University ...

Earthquake Engineering Research - HKU Libraries - The University ...

Earthquake Engineering Research - HKU Libraries - The University ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

I 000,000<br />

100,000<br />

Number of uniformly processed records<br />

in USC strong motion database<br />

Cost of<br />

digitization system $<br />

10,000<br />

Mechanical Spectrum Analyzer<br />

Biot (1941,1942)<br />

Scanner<br />

resolution<br />

Capacity of<br />

disk storage - Mb<br />

1,000<br />

100<br />

10<br />

Time required to compute one set<br />

of standard response spectrum<br />

curves for five damping values - mm<br />

Optronics<br />

drum scanner<br />

Typical record<br />

digitization<br />

ime - mm<br />

Mechanical<br />

analyzers<br />

Analog<br />

computers<br />

Nova (1977) 286 386 486 'Pentium<br />

Mini<br />

Personal computers<br />

computers, computer^<br />

1940 1950 1960 1970 1980 Year 1990 2000<br />

Figure 1

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!