Exhibit 24
 
POWER OF ATTORNEY
 
     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Jong S. Whang, Bradley C. Anderson and Robert T. Hass, and each of them, his true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign any and all amendments to this registration statement, and to file the same, with all exhibits thereto, and other documents in connection therewith with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, and fully and to all intents and purposes as he might or could do in person hereby ratifying and confirming all that said attorney-in-fact and agents, or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof.
 
Signature Title Date
 
Chief Executive Officer and
/s/ Jong S. Whang   Director (Principal Executive August 4, 2010
Jong S. Whang Officer)
Vice President -- Finance, Chief
Financial Officer, Treasurer and
/s/ Bradley C. Anderson Secretary (Principal Financial August 4, 2010
Bradley C. Anderson Officer)
 
/s/ Robert T. Hass Chief Accounting Officer (Principal August 4, 2010
Robert T. Hass Accounting Officer)
 
/s/ Michael Garnreiter Director August 4, 2010
Michael Garnreiter
 
/s/ Alfred W. Giese Director August 4, 2010
Alfred W. Giese
 
/s/ Egbert Jan Geert Goudena Director August 4, 2010
Egbert Jan Geert Goudena
 
/s/ Jeong Mo Hwang Director August 4, 2010
Jeong Mo Hwang
 
/s/ Robert F. King Director August 4, 2010
Robert F. King