Human Resources is the worst department to send a resume to

Human Resources primary job is the keep the people that are employed by their company happy. It is not finding new employees.

When ever possible find a contact any contact within your target company that does more or less what you are qualified for. The likelyhood of that person passing your resume on to a hiring manager is much greater that sending it to HR.

The poor HR folks are bombarded by resumes and they simply can not process them all. As a result find an inside contact and get your resume into their hands. Use the internet to find contacts, call the company and say, "I need to send a letter to your engineering manager, who should I address it to?"

Be creative, be persistent, be bold, but get your resume past the gate keepers.