A characterization of network dynamics in terms of transit times and losses is examined. The applicability of this characterization is established through experimental evaluation of connections on the Internet, using ...
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A characterization of network dynamics in terms of transit times and losses is examined. The applicability of this characterization is established through experimental evaluation of connections on the Internet, using instrumentation at the kernel level as well as at the application level. The results of this study indicate that this characterization is useful and yield several surprising outcomes, which are presented.< >
The authors model a virtual circuit in a computer network as a sequence of servers in tandem. They explicitly take into account cross traffic at the servers from other virtual circuits. The analysis of the model leads...
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The authors model a virtual circuit in a computer network as a sequence of servers in tandem. They explicitly take into account cross traffic at the servers from other virtual circuits. The analysis of the model leads them to propose a novel flow control scheme, which they term send-time control. A measure to evaluate the performance of flow control schemes, called the packet performance index, is proposed. They compare the send-time control scheme with the window-based flow control scheme of transmission control protocol (TCP) using simulation. The results obtained show that send-time control is superior to the window-based scheme.< >
作者：
J.-Y. HerveY. AloimonosComputer Vision Laboratory
Center for Automation Research Department of Computer Science Institute for Advanced Computer Studies University of Maryland College Park MD USA
An active approach to the integration of shape from x modules-here shape from shading and shape from texture-is proposed. The question of what constitutes a good motion for the active observer is addressed. Generally,...
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An active approach to the integration of shape from x modules-here shape from shading and shape from texture-is proposed. The question of what constitutes a good motion for the active observer is addressed. Generally, the role of the visual system is to provide depth information to an autonomous robot; a trajectory module will then interpret it to determine a motion for the robot, which in turn will affect the visual information received. It is suggested that the motion can also be chosen so as to improve the performance of the visual system.< >
When performing a planning or design task in many domains it is often difficult to specify in advance what the precise goals are. It is therefore useful to have a system in which the planning process is performed inte...
Consider the construction of an expert system by encoding the knowledge of different experts. Suppose the knowledge provided by each expert is encoded into a knowledge base. Then the process of combining the knowledge...
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The Karl Taylor Compton lectures delivered by H. Simon at the Massachusetts institute of Technology in 1968 and published the year later as The sciences of the Artificial (MIT Press, 1969) forms the starting point for...
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The Karl Taylor Compton lectures delivered by H. Simon at the Massachusetts institute of Technology in 1968 and published the year later as The sciences of the Artificial (MIT Press, 1969) forms the starting point for the discussion. One of the chapters in Simon's book is titled 'The science of Design: Creating the Artificial'. It is with the nature of this 'science' that the author is concerned. The author discusses the AI design paradigm, designs as satisficing solutions, bounded rationality, and the operational model of the design process.< >
Identification of high cost modules has been viewed as one mechanism to improve overall system reliability, since such modules tend to produce more than their fair share of problems. A decision tree model has previous...
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Identification of high cost modules has been viewed as one mechanism to improve overall system reliability, since such modules tend to produce more than their fair share of problems. A decision tree model has previously been used to identify such modules. In this paper, a previously developed axiomatic model of program complexity is merged with the previously developed decision tree process for an improvement in the ability to identify such modules. This improvement has been tested using data from the NASA Software Engineering Laboratory.< >
作者：
L. HuangY. AloimonosComputer Vision Laboratory
Center for Automation Research University of Maryland College Park MD USA Computer Vision Laboratory
Center for Automation Research Computer Science Department and Institute for Advanced Computer Studies University of Maryland College Park MD USA
Under the traditional paradigm of considering vision as a recovery problem, visual interception is just another application of the structure-from-motion module. However, the inherent difficulties of three-dimensional ...
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Under the traditional paradigm of considering vision as a recovery problem, visual interception is just another application of the structure-from-motion module. However, the inherent difficulties of three-dimensional reconstruction have delayed any real-time applications. The authors offer a robust solution under the active qualitative vision paradigm. From the image intensity function, they obtain the locomotive intrinsics of the agent and the target. Based on this relative information, they present a control strategy that decides in real time whether the velocity of the agent should be increased or decreased at any time instant, thus guiding the agent to intercept the target. The problem of visual interception can thus be solved by simple computation without correspondence.< >
The authors' (Monahemi, Barlow, and O'Leary, 1991) previous work concerned with obtaining precise loop transfer recovery using a reduced-order Luenberger observer is extended. They show that for a nonsquare sy...
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The authors' (Monahemi, Barlow, and O'Leary, 1991) previous work concerned with obtaining precise loop transfer recovery using a reduced-order Luenberger observer is extended. They show that for a nonsquare system in which the number of sensors exceeds the number of actuators, precise loop transfer recovery will exist when the system does not possess transmission zeros.< >
An actual implementation of the external sorting problem on a multicomputer, with careful attention paid to the overlap between computations and I/O in order to minimize total execution time, is reported. The problem ...
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An actual implementation of the external sorting problem on a multicomputer, with careful attention paid to the overlap between computations and I/O in order to minimize total execution time, is reported. The problem is divided into two steps. The first involves creation of multiple sorted runs. The second involves merging the runs. Step 1 is accomplished using pipelined sort; step 2 is implemented on a tree of processors. An analytical model for step 1 is presented. The execution time predicted by the proposed analytical model is compared with the experimental results.< >
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