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Due to the recent development in micro mechanics, electronics and wireless communication technologies, Multi-Robot Sensor Network (MRSN) becomes a hot issue for many robotic applications. In MRSN, from a viewpoint of sensor network communication, each robot senses data and transmits it to the adjacent robot to collect all data at the sink in a multi-hop manner. According to applications, delay taken...
We propose a novel optical configuration for a multichannel tunable optical dispersion compensator (TODC) with channel-by-channel operation across the entire L-band. The TODC consists of a cyclic frequency arrayed-waveguide grating whose free spectral range coincides with the channel spacing, a bulk grating, and a liquid crystal on silicon. We achieved channel-by-channel compensation over 50 channels...
An analog-to-digital and time-to-digital converter using a common architecture (Time A/D converter TAD) is presented. Its resolutions for both analog-to-digital converter (ADC) mode and time-to-digital converter (TDC) mode are settable. The circuit structure is a completely digital circuit including a ring-shaped pulse-delay-line (RDL) driven by an input voltage Vin, along with an RDL synchronous...
An all-digital A/D converter TAD (time A/D converter) with 0.0027 mm2 is presented. The circuit structure is completely digital including a pulse-delay-line driven by Vin (input voltage), along with a counter, latch, and encoder. The TAD is easily shrinkable with the advancement in CMOS process technologies without any change of circuit architecture. Thanks to this construction, A/D conversion resolution...
This paper describes evolutionary image filter design for noise reduction using genetic algorithm (GA), where the circuit complexity, power and signal delay are optimized. First, the evaluating value about correctness, complexity, power and signal delay are introduced to the fitness function. Then GA autonomously synthesizes a circuit which is simple and has good performance. To verify the effectiveness...
Due to the importance of power/ground network, lots of researches have been made on it. But they only focused on the minimal area of it. By discussion on the relation among Vdd, performance and power consumption, this paper proposes an optimal algorithm using GA and SLP method where area, performance and power consumption can be simultaneously evaluated. As a result, the power/ground network is designed...
In a P2P network, it is common that data items are replicated on multiple peers for improving data availability. In such an environment, when a data item is updated on a particular peer, the update should be immediately propagated to other peers holding its replicas. However, in some applications, some replica holders do not need the update when the degree of change in the update is small. In this...
Evolvable hardware (EHW) is a new field about the use of evolutionary algorithms (EA) to synthesize a circuit. Genetic algorithm (GA) is one of the typical EA. In traditional GA, the crossover is one-point crossover or two-point crossover. One-point crossover and two-point crossover change the genes of individuals too many in one time and they are not flexible, so it may lose some useful genes. In...
The OFDM system that can use it combined to the Fourier transform to the OFDM signal for amount of wave of the inverse Fourier transform and received OFDM can have a definite advantage in power consumption, a super-high-speed operation processing performance be possessed, and the SAW chirp-Z transform be applied to high-speed wireless LAN and WAN. As for the SAW chirp-Z transform, operation speed...
The surface acoustic wave has a definite advantage in the Fourier transform for distribute of OFDM that is converted into the OFDM signal and received in power consumption and has a super-high-speed operation. The operation speed of the SAW Chirp-Z transform processor composed of SAW Down Chirp Filter of bandwidth 100 MHz and N=2,048 becomes 5.5GFLOPS. The condition that the temperature coefficient...
An active body weight support (BWS) system, which unloads body weight with pelvic support, has been developed to assist the walking movement. This system unloads body weight with a motor-actuated device from below with pelvic support, unlike prevailing BWS systems that lift up the subject from above via a harness connected to a wire. The force control method to unload body weight has not been sufficiently...
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