The state of the art in printed wiring board inspection

Path Optimization for Electrically Inspecting Printed Circuit Boards with Alignment Marks

In inspections of printed circuit boards (PCBs), a test probe has to be moved to a number of PCB wiring patterns in some order. This paper considers path optimization for minimizing a total path length of testing PCBs arrayed on a plane. Due to the miniaturization of PCBs, the procedure of “alignment” has been recently needed in order to know the exact position of each wiring pattern before eac...

Measurement Problems in High-speed Networks

Computer hardware and communications network speeds are rising at a steady rate. From Moore’s law we know that the silicon computing power is doubled every 18 month, and especially with the onset of internet, the demand for increasing network bandwidth is also on the constant rise. CPU speeds have recently broken through the IGHz barrier, a d IOGbiu‘sec network connections are becoming common. ...

Recycling of Precious Metals from E-scrap

Recovery of gold and other valuable metals from electronic scrap involves a complex metallurgical flow sheet and requires state-of-the-art recovery technologies that are available in large-scale, integrated smelter and refinery operations. At the end of their use, electronic and other electrical product scrap offer an important recycling potential for the secondary supply of gold and silver...

MULTI-PRIDE: a system for supporting multi-layered printed wiring board design

The purpose of the paper is to outline MULTI-PRIDE, a system for supporting multi-layered printed wiring board design. It consists of (i) circuit bipartition, (ii) placement and routing on each outside layer, (iii) modi cation of wiring and compaction, and (iv) routing on inside layers.

Printed Wiring Board Pollution Prevention and Control Technology: Analysis of Updated Survey Results