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Particle swarm optimization (PSO) algorithm is a population-based algorithm for finding the optimal solution. Because of its simplicity and high efficiency, PSO is gaining attention in solving complex and large scale problems. However, PSO often requires long execution time to solve those problems. This paper proposes a parallel PSO algorithm, called delayed exchange parallelization, which improves...
This correspondence introduces a student LSI design contest http://www.LSI-contest.com/ which is annually held at Okinawa in March. Year 2009 contest was 12th anniversary. Applicants are not only from Japan but also from all over Asian countries. The main purpose of this contest is to develop LSI design skills for college students. This correspondence introduces LSI design contest from various aspects...
This paper proposes a novel robust output feedback controller for an electromechanical system in the presence of external disturbance and uncertainties of physical parameters. By exploiting the cascade features of backstepping design, a simple disturbance observer is proposed to suppress the effects of the uncertainties, and a high-gain observer is applied to estimate the unmeasureable states of the...
Since barrier synchronization is a simple means to guarantee the order of data producing and data consuming, it is often used in parallel programs. However, barrier synchronization causes the processors' idle time to increase. To reduce the overhead of barrier synchronization, we have proposed an algorithm which eliminates barrier synchronizations and evaluated its validity experimentally. In this...
This paper presents architecture for accelerating message switch and synchronization performed in a message passing library developed on Maestro3 cluster network. Maestro3 is a high-performance cluster network that has the optimized data link layer and the capability of dynamic offload. We propose the dedicated hardware for further improvement of communication performance. In this paper, detailed...
This paper proposes structures of multi-path filters robust to substrate noise and nonlinearity of elements under low supply voltage to achieve wide dynamic range. They are derived by combining two structures which have been known to suppress substrate noise and nonlinearity more than the balanced one. Dynamic ranges and substrate noises of three proposed structures, the balanced (two-path) one, and...
In the last years, the performance and capabilities of graphics processing units (GPUs) improved drastically, mostly due to the demands of the entertainment market, with consumers and companies alike pushing for improvements in the level of visual fidelity, which is only achieved with high performing GPU solutions. Beside the entertainment market, there is an ongoing global research effort for using...
In coming ubiquitous network society, a user who has no knowledge about network technology might have to manage his/her network including information appliances and sensor networks. Current network is, however, too difficult to manage because protocols to access ubiquitous network devices are not same and it is not easy to identify the cause of problems if a network failure occurs. Toward uniting...
The scientific drilling vessel Chikyu began scientific drilling at the Nankai Trough in 2007 via a system integration drilling test off Shimokita. To attain success in deep drilling and coring, one of the important issues is to ensure the strength of the drill pipes. During drilling operations, various forces are exerted on the drill pipe, such as dynamic tension due to vessel heave as well as bending...
In this paper, a novel robust nonlinear motion controller with disturbance observer (DOB) for positioning control of a nonlinear single-input-single-output (SISO) mechanical system is proposed. The controller is designed in a backstepping manner. At the first step, a PI controller is designed to stabilize the position error. Then at the second step, a novel robust nonlinear velocity controller with...
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