Representation and manipulation of multiple target locations would be important aspects of spatial working memory [Tanaka 2002a, b]. It is, however, unknown how such processes are performed in the prefrontal cortical, corticocortical, and cortico-subcortical circuits. We here propose a model of the prefrontal cortical and cortico-thalamocortical circuits that represent and manipulate multiple t...

A new type of highly-directional ultrasonic range sensor is designed, fabricated, and tested in this paper. To improve directivity, the parametric acoustic array, a nonlinear effect of media between two intensive waves, is applied to an ultrasonic range sensor. Additionally, a new type of the stepped-plate transducer is applied for generating high amplitude waves consisting of two frequencies. ...

The single-feed design of compact microstrip patch antenna with a rectangular ring slot has been demonstrated and results are presented. Simply by inserting a narrow slot of proper length and width on the patch surface, a bandwidth of 330 MHz (9.04 %) with a gain of 2.93 dB is achieved. Results also indicate that, at fixed operating frequency, the proposed design has good omni-directional radia...

We measured the directionality of the cones with both a psychophysical (Stiles-Crawford I) technique and an optical technique. The two sets of measurements were made in the same subjects, with stimuli as similar as possible used. The two types of measurements gave similar estimates of the location in the pupil toward which the cones were optimally aligned. However, the two measurements gave qui...

We calculate numerically the full Floquet-Bloch stability spectrum of cellular array structures in a symmetric model of directional solidification. Our results demonstrate that crystalline anisotropy critically influences the stability of these structures. Without anisotropy, the stability balloon of cells in the plane of wave number and velocity closes near the onset of morphological instabili...

The photonic band gap PBG effect and its isotropy of sunflower-type circular photonic crystal CPC are obtained and investigated from the transmission spectra performed by finite-difference time-domain FDTD method. The PBG directional width variation is found to be only 6.7%. A well-confined whispering gallery mode WGM with azimuthal number of 6 is obtained by FDTD simulation from the CPC microc...

This paper presents a simple approach for implementation of a Space Vector Pulse Width Modulation (SVPWM) Technique for control of three phase Matrix Converter (MC) using MATLAB/Simulink & FPGA Software. The Matrix converter is a direct AC/AC Power conversion without an intermediate DC link. This converter is inherently capable of bi-directional power flow and also offers virtually sinusoidal i...

background: stroke is a heterogeneous disease with several risk factors. high sensitivity c-reactive protein (hscrp) is a marker for cardiovascular and cerebrovascular diseases. recent studies have shown that high hscrp level is a risk factor for ischemic stroke. the objective of our study was to investigate the association of high hscrp (> 3 mg/l) levels with ischemic stroke and its subtypes i...

We demonstrate low-loss, single-mode photonic wires in silicon-on-insulator as an enabling technology for future dense photonic integrated circuits. These waveguides are defined with 248nm deep UV lithography and have losses as low as 2.4dB/cm for a width of 500nm at 1550nm wavelength. Bends and directional couplers are fabricated and used to build ring resonators with 5μm radius, Q-factors hig...

A cavity-backed spiral antenna with ultra-wide band width is presented. By using a parabolic reflector, the radiation of the antenna becomes uni-directional, and the gain is promoted. The antenna is fed by a coaxial cut-away balun with fan-shaped patch which keeps a wideband impedance matching. The simulated bandwidth for VSWR < 2 covers 0.36 ~ 6.83GHz or bandwidth ratio of 19:1, and the gain a...