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In this paper, a novel phaseless-measurement method is proposed to measure complex element fields for phased array calibrations. In general phased arrays, an element field in one phase shift is different from the other ones because phase shifters, which are usually digital ones, have some transmitting errors at every phase shift. The proposed method can determine a complex element field at every phase...
This paper presents a novel smart digital control method using P-I-D control and a model control. This control circuit is able to detect not only the average output voltage but also the input voltage and the output current to improve the dynamic characteristics. As a result, the undershoot of the output voltage, the overshoot of the reactor current and convergence time of the output voltage are improved...
A voice transformation method that only relies on vowel information is proposed. The method is based on empirical cumulative distributions of perceptually relevant spectral distances, which are used to design mapping functions from distance to proximity. A set of operators are optimized in the design phase to implement on-the-fly compilation of executable transformations used in the transformation...
We report a newly developed mixed-signal simulation tool for micro optoelectromechanical systems. Multi-physics signals in electrical, mechanical and optical domains are handed as electrical voltage or current in a circuit simulator Qucs, by implementing an equation-defined analytical model into the voltage-controlled current sources. This paper reports an equivalent circuit implementation of the...
The authors have been developing a simple partial discharge model to analyze phase-resolved partial discharge characteristics such as ! -n characteristics. The simple model is simply based on the Whitehead's three-capacitance equivalent circuit model for partial discharges. The authors proposed an integral equation based on the fluctuation of delay time of each partial discharge inception. They already...
This paper proposes an information transmission model through Particle Swarm Optimization (PSO). This model enables us to manage the complexity of information topic. We consider the factors of PSO as the three aspects of the information transmission: 1) the structure of network, 2) the value of information, and 3) the character of agents. Our main findings are 1) the relation between topics and the...
This paper describes a new method that allows ldquoBarge-Inrdquo in various environments for robot audition. ldquoBarge-inrdquo means that a user begins to speak simultaneously while a robot is speaking. To achieve the function, we must deal with problems on blind dereverberation and echo cancellation at the same time. We adopt Independent Component Analysis (ICA) because it essentially provides a...
The high-speed and high-resolution ADC is a key enabler for many future wireless communications systems. The digital background calibration technique can be used to reduce the total power consumption by enhancing the linearity without using high-gain amplifiers. One of the main practical constraints in the wireless applications is a short time available for calibration. This paper proposes a novel...
A rotary actuator type electric active suspension system, adopted for the investigation, enable to control roll, pitch, and bounce. The system allows controlling the vehicle attitude by an inertial input logic while sky-hook logic improves ride comfort. Actual vehicle motion control effects on the driverspsila reaction were investigated. Driverspsila reaction differences were examined on the slalom...
For some classes of singularities there exist defining equations with parametric coefficients and exponents. We can treat these defining equation with parametric exponents as sequences and calculate their Grobner bases. Grobner bases are useful for clarifying the structure of the parameters of the defining equation, which will enable us to discover some interesting properties about them. The purpose...
Power supply failure will cause major social loss. Therefore, power supply systems have been required to be highly reliable. This research deals with a significant and effective method to decide the investment in a power system damage of the power supply on the society. In CMD2007 Korea, we proposed mean-variance approach to replacing unreliable units in a power system. This paper extends the method...
A three-dimensional time-dependent computational magnetohydrodynamics (MHD) code has been developed for research and development of a rotary-type gas circuit breaker. A test computation of arc-plasma flows under externally applied magnetic field in a small chamber has been carried out by using the developed computational code. The computational results have successfully demonstrated the unsteady behaviour...
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