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Software visualization with sequence diagrams is one of the promising techniques aimed at helping developers comprehend the behavior of object-oriented systems effectively. However, it is still difficult to understand this behavior, because the size of automatically generated sequence diagrams tends to be beyond the developer's capacity. In this paper, we propose a sequence diagram slicing method,...
This paper investigates techniques for reducing computational complexity of tracking eyes of computer user. By empirical evaluation of a number of techniques we define a technology capable of monitoring eyes of computer user in real time with high accuracy and very low computational overhead.
We aim at developing a remote collaborative Mixed Reality (MR) system targeting the interaction between instructors and workers. In this system, both instructors and workers have their own real objects, and the instructor shows the worker how to operate the object by moving his own real object. Since the movement of the instructor's object is displayed as a CG image of the trajectory overlapping the...
We propose a novel OFDM scheme with the subchannel frequency spacing at 80% of the symbol rate. Experiment results show that the scheme achieves OSNR-sensitivity and dispersion-tolerance levels equal to those of the conventional OFDM.
Methods of presenting fragrances have been proposed as a means of preventing drivers from dozing and helping them remain alert. However, the stimulation effects of fragrances and their durations have yet to be evaluated sufficiently. In addition, it is necessary to consider the decrease in sensitivity that results as the driver adapts to a fragrance. We examined fragrance presentation techniques for...
In the present paper, we consider a design method that provides low-sensitivity control with robust stability for multiple-input/multiple-output continuous time-invariant systems having an uncertain number of unstable poles. First, the class of uncertainty considered in the present paper is defined and the necessary and sufficient robust stability condition is presented for the system having this...
In the last ten years, studies that focus on the extraction of patterns among contrast classes and reveal the differences among these classes have been conducted. There exist two major streams in such studies, namely, emerging patterns (EPs) and contrast patterns (CPs), and related works concerning both have been proposed. In this field of study, the main problems pertain to extracting the efficiency...
In this paper, we consider a reduction problem of vibration in riding and rider's burden by stabilizing the bicycle at slow speed. In riding a bicycle, the reference input which is generally required by feedback methods is implicitly determined by a rider. Hence, the preassigned reference input may be biased against the rider's intention. To compensate the bias, we adopt robust washout control which...
We consider a tuning problem for a class of feedforward controllers for a given closed-loop system with an unknown plant by only using of the input and output measurements. The feedforward controllers which should be tuned are implemented as a unity feedback system of a conventional PID controller. Hence, the feedforward controller is just tuned by the PID parameters which is implemented in the controller...
In this paper, we consider a decentralized control problem for suppressing the traffic jam phenomenon in traffic flow. To analyze the phenomenon, we use the so-called optimal velocity model. In the model, the optimal velocity function which is a nonlinear function of the headway of the preceding vehicle describes driver's characteristics. Without affecting the characteristics, all vehicles in traffic...
The reduction of residual acceptors in GaAsN films and the improvement of GaAsN crystal quality evidenced by hole mobility and PL intensity were reported. Si doping using a SiH4 gas was also studied. Based on these results GaAsN homo-junction solar cells were fabricated by CBE at the first time. The short circuit current, open circuit voltage, fill factor and conversion efficiency of the GaAsN solar...
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