Time-triggered systems require a very high degree of temporal accuracy at critical stages during run time. While many software fault injection environments exist today, none of these make provisions to meet the timing requirements of such sys-

We discuss here some open issues concerning the problem of modeling signals with low multiplicity within the context of systems theory. In particular we focus on the issue of approximating a stochastic process with a low multiplicity one, and we propose some applications to the theory of interest rates models.

The notions of decoupling zeros of positive discrete-time linear systems are introduced. The relationships between the decoupling zeros of standard and positive discrete-time linear systems are analyzed. It is shown that: 1) if the positive system has decoupling zeros then the corresponding standard system has also decoupling zeros, 2) the positive system may not have decoupling zeros when the ...

In the past decade there has been a large scope of studies on mathematical models of social dynamics. Self-organization, i.e., the autonomous formation of patterns, has been so far the main driving concept. Usually first or second order models are considered with given predetermined nonlocal interaction potentials, tuned to reproduce, at least qualitatively, certain global patterns (such as flo...

—In some scenarios such as catastrophes and military operations, there is a need for communication without an infrastructure. In urgent cases, in-time and reliable channel access must be ensured. However, the channel access delay in widely used CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) network increases unpredictably when the channel is sensed busy. Therefore, TDMA (Time...

Main m e m o r y databases are promising approach t o realize high-performance sys tems without expensive special hardware. One serious problem is reliability and we need t o develop backup and recovery mechanisms suitable for m a i n m e m o r y . In order t o reduce overhead for backup operations, we have developed continuous backup mechanisms, which transmit data t o archive storage during u...

AIMS Left ventricular (LV) dilatation, hypertrophy, and septal perfusion defects are frequently observed in patients with left bundle branch block (LBBB). We investigated whether isolated LBBB causes these abnormalities. METHODS AND RESULTS In eight dogs, LBBB was induced by radio frequency ablation. Two-dimensional echocardiography showed that 16 weeks of LBBB decreased LV ejection fraction ...

Systemic vascular resistance (R(sys)) of freshwater turtles increases substantially during anoxia, but the underlying mechanisms are not fully understood. We investigated whether hydrogen sulfide (H(2)S), an endogenously produced metabolite believed to be an O(2) sensor/transducer of vasomotor tone, contributes to the increased R(sys) of anoxic red-eared slider turtles (Trachemys scripta). Vasc...

The afferent arteriolar myogenic response contributes to the autoregulation of renal blood flow (RBF) and glomerular filtration rate (GFR), and plays an essential role in protecting the kidney against hypertensive injury. Systolic blood pressure (SBP) is most closely linked to renal injury, and a myogenic response coupled to this signal would facilitate renal protection, whereas mean blood pres...

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