Two widely-studied approaches for structuring fault-tolerant services are the state-machine and the primary-backup replication schemes. For a large class of soft and hard real-time applications, the degree of consistency among servers can be exploited to design replication protocols with predictable timing behavior. This is particularly useful in applications, such as automated process control,...

Evidence for multisensory integration is found in many different circumstances, notably as facilitation or inhibition of responses to cross-modal stimulus sets, compared to unimodal stimulation. Prime examples of facilitation include increased firing rate of a multisensory neuron, acceleration of manual or saccadic reaction time, or effective integration of audiovisual speech. Besides facilitat...

We extend the spectrum estimation method of Thomson to non-stationary signals by formulating a multiple window spectrogram. The traditional spectrogram can be represented as a member of Cohen’s class of time-frequency distributions (TFDs), where the smoothing kernel is the Wigner distribution of the signal temporal window. We show the unusual shape of the Cohen’s class smoothing kernels corresp...

Clinical trials of reperfusion therapies for acute ischemic stroke patients in an extended time window have shown mixed results. Advanced neuroimaging for stroke, more specifically vascular imaging and perfusion/penumbral imaging, have been hypothesized to be powerful selection tools in this setting. However, a number of improvements and validation steps are needed to make these imaging techniq...

This paper addresses the task of learning concept descriptions from streams of data. As new data are obtained the concept description has to be updated regularly to include the new data. In this case we can face the problem that the concept changes over time. Hence the old data become irrelevant to the current concept and have to be removed from the training dataset. This problem is known in th...

We overview a new non-parametric method for estimating the time-varying spectrum of a non-stationary random process. Our method extends Thomson’s powerful multiple window spectrum estimation scheme to the time-frequency and time-scale planes. Unlike previous extensions of Thomson’s method, we identify and utilize optimally concentrated Hermite window and Morse wavelet functions and develop a st...

近年,脳梗塞の治療では心筋梗塞の治療と同様に早 期診断・早期治療の重要性が叫ばれ,心筋梗塞が “Heart Attack”と呼ばれ可急的速やかに治療され一命 をとりとめるように,脳梗塞も“Brain Attack”と捉え 同様に速やかに治療を行い,後遺症を最小限にくいと めることの重要性が認識されつつある.脳虚血が発症 して脳血流が遮断されると脳組織は数時間で不可逆性 の変化をきたし壊死に陥って梗塞となる.ひとたび脳 梗塞に罹患すると片麻痺や言語障害などの神経症候, 記憶・記銘力の低下や情緒障害などの精神症状,さら にQOLの低下や痴呆症などの後遺症に苦しむことに なり社会的生命を失うことにもなる. 近年CT(computed tomography),MRI・A(magnetic resonance imaging・angiography),SPECT(single photon e...