James Hofmeister

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In this paper we present two sensors for real-time detection of solder-joint faults in programmed, operational Field Programmable Gate Arrays (FPGAs), especially those FPGAs in Ball Grid Array (BGA) packages. The first sensor uses a method in-situ within the FPGA and the second sensor uses a method external to the FPGA. Initial testing indicates the first(More)
In this paper, a leading indicators based approach has been developed for prognostics and health monitoring of electronic systems. The approach focuses on the prefailure space and methodologies for quantification of damage progression and residual life in electronic equipment subjected to shock and vibration loads using the dynamic response of the(More)
Accidents involving trains have been attributed to degraded track and rolling stock. Detection of anomalies that indicate degraded condition is critical. In this paper we present results of an experiment using a sensor system mounted on one of the 110 boxcars on a train on a high-tonnage loop test track. The sensor was a microelectromechanical systems(More)
In this paper we introduce a solderjoint built-in-self-test (SJ BIST) for detecting high-resistance and intermittent faults in operational, fully programmed field programmable gate arrays (FPGAs). The approach is simple to implement, offers a method to detect high-resistance faults that result from damaged solder joints, and uses a maximum of one small(More)
The authors present a sensor for real-time detection of solder-joint faults in programmed, operational Field Programmable Gate Arrays (FPGAs), especially those FPGAs in Ball Grid Array (BGA) packages, such as a XILINX® FG1156 [1]. FPGAs are used in all manner and kinds of control systems in aerospace applications. The ability to sense high-resistance faults(More)
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