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This paper proposes the optimization method which extends Pittsburg-style Learning Classifier System (LCS) for Pacific Ocean route. In detail, the following extensions are introduced: (1) the unrealistic route deletion, (2) the route integration, and (3) the route rest time minimization and the anchor order change. To investigate the effectiveness of the proposed methods, this paper applies them into...
A simultaneous shape and topology optimization method for designing patch antennas is discussed. The material distribution of a dielectric substrate is optimized using topology optimization concurrently as the metallic patch is optimized using shape optimization. The radiation amplitude in a specified mode at a selected frequency is chosen as the design objective and the resonance frequency is consequently...
We propose a model-based optimization algorithm that determines virtual machine(VM) migration strategies, i.e., which VMs should be migrated to which nodes, while minimizing I/O access costs. We solve this problem as a shortest path problem of a direct acyclic graph which minimizes overall data access costs of target file accesses. Our simulation-based studies suggest that the proposed algorithm can...
When a disaster occurs in the city center and roads and railroads etc. become unable to use, the waterbus has the great potential vehicles to transport passengers and several supplies. Since the number of passengers in such situation tend to change, according to the reconstruction degree of the city, effective and robust routes that can use two or more situations. To obtain such routes, this paper...
With the recent rapid progress in handsets, the downsizing of their antennas is acquiring great importance. Generally, these antennas have been downsized by changing a configuration of the antennas or utilizing materials such as dielectric materials and magnetic materials. Until now, we have investigated a downsizing technique of antennas for handsets by utilizing magnetic materials. The topology...
In this paper, topology design optimization for electromagnetic materials, a left- handed leaky wave antenna for millimeter-wave applications, and left-handed dipole antennas have been presented along with some thoughts for future investigation. All have been the subject of recent metamaterial studies at TCRL and TEMA. Metamaterials will clearly open up a whole new field for automotive electronics...
In this research, we propose a new topology optimization method for the design of dielectric resonator antennas (DRAs) aiming to operate with enhanced bandwidths at multiple operational bands, using the finite difference-time domain (FDTD) method for electromagnetic analysis and the finite element method (FEM) for structural mechanics analysis. First, the concept of topology optimization is briefly...
As for hot gas flow according to fluid equation with interaction with electrical arc and solid chamber, fluid equation must be solved with moving boundary of the chamber and with interaction with hot arc and impurity intrusion. Here we propose application of CIP (cubic interpolated propagation) scheme, which is convenient and good at efficient advection and boundary motion. The CIP code was tested...
This paper proposes a new topology optimization method for the structural design of antennas, based on time-domain analysis using the FDTD method. First, the concept of the topology optimization and the way of integrated the topology optimization and the FDTD method are explained. Then, DRA design example is presented in order to confirm the usefulness of the proposed method
A novel receiver configuration enabling automatic dispersion equalization is proposed. An equalizer is configured with variable-dispersion, and it is shown that the optimum dispersion can be detected by monitoring the clock component of the transmitted signal after square law detection. Using this equalizer, a 40-Gbit/s transmission experiment over 200 km of dispersion shifted fibre (DSF) was successfully...
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