作者：
Chris McDonaldKamran KazemiProgramming
Languages and Systems Group Department of Computer Science The University of Western Australia Nedlands Western Australia 6907
Parallel algorithms are often introduced to students by describing the geometric topologies formed by communicating processes and often the geographic relationships between them. However, the two most common message p...
ISBN:
(纸本)9781581132137
Parallel algorithms are often introduced to students by describing the geometric topologies formed by communicating processes and often the geographic relationships between them. However, the two most common message passing environments used in teaching, PVM and MPI, each provide only rudimentary support for the specification and execution of process topologies. There is a strong need for better syntactic and semantic support for process topologies in these environments, so that students may concentrate on the algorithms being studied, and not have to wrestle with the environments' infrastructure. This paper first motivates, and then describes the use of additional support within PVM and MPI which addresses this need.
A Mathematical model of the short-term arterial pressure control in humans is presented. It includes a six-compartment description of the vascular system, an elastance variable model of the pulsating heart, two groups...
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A Mathematical model of the short-term arterial pressure control in humans is presented. It includes a six-compartment description of the vascular system, an elastance variable model of the pulsating heart, two groups of baroreceptors (high-pressure or sinoaortic baroreceptors and low-pressure or cardiopulmonary baroreceptors), the efferent activity in the sympathetic nerves and in the vagus, and the response of four distinct effectors (heart period, systemic peripheral resistance, systemic venous unstressed volume and heart contractility). Several experimental results reported in the physiological literature can be reproduced with the model quite well. The examples presented in this work include the effect of combined sympathetic and vagal stimulation on heart rate, the baroreflex response to mild and severe acute haemorrhages, and the baroreflex response to ventricular pacing at different rates performed during atrio-ventricular block. The results suggest that: i) The sympathetic nerves and the vagus interact linearly in regulating heart period. The apparent negative interaction observed experimentally can be ascribed merely to the hyperbolic relationship which links heart rate to heart period. ii) The cardiopulmonary baroafferents play a significant role in the control of systemic arterial pressure during mild haemorrhages (lower than 3-4% of the overall blood volume). In this range, they may allow arterial pressure to be maintained at its normal level without the intervention of the sinoaortic baroreceptors. In contrast, the sinoartic baroreceptors become the major responsible of the observed cardiovascular adjustments during more severe haemorrhages, when the role of cardiopulmonary baroreceptors becomes progressively exhausted. iii) The stability margin of the closed-loop system is quite low. Increasing the static gain of the baroreceptors or reducing the rate-dependent component may result in self-sustained oscillations similar to Mayer waves.
In ITS (intelligent transport systems), driving support systems for a driver is very important. The paper aims at providing the driver with blind spot information, in advance, taking his intention into consideration i...
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This paper proposes a new communication architecture which is based on a round-table mechanism. Communication channels are preliminarily defined according to the matching of agent requests. A channel connects an agent...
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A framework for understanding and exploiting embodiment is presented which is not dependent on any specific ontological context. This framework is founded on a new definition of embodiment, based on the relational dyn...
A framework for understanding and exploiting embodiment is presented which is not dependent on any specific ontological context. This framework is founded on a new definition of embodiment, based on the relational dynamics that exist between biological organisms and their environments, and inspired by the structural dynamics of the bacterium Escherichia coli. The definition draws on the idea of mutual perturbation between a system (biological organism, robot, or software agent) and its environment, enabling structural coupling between the two. The framework provides a vocabulary and concepts that can be used to discuss and analyze embodiment in any kind of environment, not just the material world. Rather than blurring boundaries between disciplines and domains, this permits the characterization of distinctions and common features between them, in a manner meaningful to all parties. Other benefits include the potential quantification of embodiment, and access to practical and theoretical ideas associated with material embodiment for those working with non-material systems. The relational embodiment definition is illustrated by ongoing experimental work in which the relational dynamics that exist between E. coli and its environment are applied in a variety of environments, both software and material, using a Cellular Automata-based system with artificial ‘sensory’ and ‘effector’ surfaces. This experimental system is also used to outline a biologically grounded, dynamical systems-based approach to the generation of behavior in a variety of operational environments, exploiting features of the embodiment framework presented.
Visualization of a three-dimensional fish behavior based on the successive feature extraction using the time sequential three-dimensional shape modeling is reported. The principle of the modeling is based on the inter...
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Visualization of a three-dimensional fish behavior based on the successive feature extraction using the time sequential three-dimensional shape modeling is reported. The principle of the modeling is based on the intersected viewing pyramid consisting of each image boundary of the object and the corresponding focal point. Threedirectional video images are simultaneously acquired and sequential solid models are then reconstructed to obtain behavioral parameters such as body shape, skeleton, head, tail, gravity center, direction, attack angle, trajectory, velocity, acceleration, and moving energy. This procedure is entirely automatic requiring no manual operation and appears to have some considerable utility in tracking and measurement of moving objects.
In this paper, an, analysis of test time by CBET (which is an acronym for Combination of BIST and External Test) test approach is presented. The analysis validates that CBET test approach can achieve shorter testing t...
The C4ISR Architecture Framework document issued by the department of Defense specifies three views of an information architecture and defines a set of products that describe each view. These architecture views are to...
This paper presents the adaptive analysis of incompressible flow using a nodal-based method named the "free-mesh method". The free-mesh method is a kind of nodal-based FEM. In the fundamental algorithm, loca...
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This paper presents the adaptive analysis of incompressible flow using a nodal-based method named the "free-mesh method". The free-mesh method is a kind of nodal-based FEM. In the fundamental algorithm, local system equations with triangular elements are created nodewise to create the global system equations. Therefore, the free-mesh method is well compatible with analyses including remeshing process. The global h-type method is applied to the tree-mesh method. Nodal distribution is completely changed every adaptation according to the adaptive strategy based on a posterior error estimation. A control of nodal densityd istribution is used. By a numerical example, compatibility of the free-mesh method witha daptive analysis is discussed.
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