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The high computational cost of complex engineering optimization problems has motivated the development of parallel optimization algorithms. A recent example is the parallel particle swarm optimization (PSO) algorithm, which is valuable due to its global search capabilities. Unfortunately, because existing parallel implementations are synchronous (PSPSO),(More)
Present day engineering optimization problems often impose large computational demands, resulting in long solution times even on a modern high-end processor. To obtain enhanced computational throughput and global search capability, we detail the coarse-grained parallelization of an increasingly popular global search method, the particle swarm optimization(More)
Storage, memory, processor, and communications bandwidth are all relatively plentiful and inexpensive. However, a growing expense in the operation of computer networks is electricity usage. Estimates place devices connected to the Internet as consuming about 2%, and growing, of the total electricity produced in the USA—much of this power consumption is(More)
The global address space (GAS) programming model provides important potential productivity advantages over traditional parallel programming models. Languages using the GAS model currently have insufficient support from existing performance analysis tools, due in part to their implementation complexity. We have designed the Global Address Space Performance(More)
Dynamic patient-specific musculoskeletal models have great potential for addressing clinical problems in orthopedics and rehabilitation. However, their predictive capability is limited by how well the underlying kinematic model matches the patient's structure. This study presents a general two-level optimization procedure for tuning any multi-joint(More)
Chip-multiprocessor (CMP) architectures present a challenge for efficient simulation, combining the requirements of a detailed microprocessor simulator with that of a tightly-coupled parallel system. In this paper, a distributed simulator for target CMPs is presented based on the Message Passing Interface (MPI) designed to run on a host cluster of(More)
Commercial SRAM-based, field-programmable gate arrays (FPGAs) have the potential to provide space applications with the necessary performance to meet next-generation mission requirements. However, mitigating an FPGA’s susceptibility to single-event upset (SEU) radiation is challenging. Triple-modular redundancy (TMR) techniques are traditionally used(More)
System-level design presents special simulation modeling challenges. System-level models address the architectural and functional performance of complex systems. Systems are decomposed into a series of interacting subsystems. Architectures define subsystems, the interconnections between subsystems and contention for shared resources. Functions define the(More)
— 123 With the ever-increasing demand for higher bandwidth and processing capacity of today's space exploration, space science, and defense missions, the ability to efficiently apply commercial-off-the-shelf (COTS) processors for on-board computing is now a critical need. In response to this need, NASA's New Millennium Program office has commissioned the(More)