>i have problem in downloading this paper

the website for 2009 Open-source Software for Scientific Computation (www.osscweb.org) appears to be down...

a new website called http://www.ossc2011.org/ is available - you might try contacting Kang Cai about getting the paper from the 2009 conference,  or contacting the ieee, from the 2011 website:

Note: All accepted papers of OSSC 2009 had been published by IEEE Press, which were cited by EI.