The proliferation of personal and medium-sized computers, the widespread availability of data communication networks, and the need to support cooperative work among geographically dispersed individuals have motivated ...
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The proliferation of personal and medium-sized computers, the widespread availability of data communication networks, and the need to support cooperative work among geographically dispersed individuals have motivated the recent development of distributed information-management environments (DIME). In this paper, we explore the functions and structure of DIMEs, describe the MOSAIC reference model for computer-supported collaborative work, and present an example of a prototype DIME designed to support collaborative decision making among individuals in distributed command-and-control environments.
Modeling the available bandwidth of a path using a known stochastic process is one possible method for estimating future available bandwidth along the path without explicit support from network routers. Our two hypoth...
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Modeling the available bandwidth of a path using a known stochastic process is one possible method for estimating future available bandwidth along the path without explicit support from network routers. Our two hypotheses for the stochastic process are as follows. First, an auto-regressive integrated moving-average process (ARIMA) is a suitable model for the available bandwidth over time of a path. Second, the available bandwidth over time of a path can be modeled as a self-similar process. We verify both hypotheses using R statistical software and available bandwidth data sets published by Stanford Linear Accelerator Center (SLAC). Our results indicate that the available bandwidth over time of an end-to-end path can be modeled as fractional Gaussian Noise (FGN) and seasonal fractional ARIMA (SFARIMA) processes. On the other hand, we found that an ARIMA process is not a good model for available bandwidth over time of an end-to-end path.
The authors comment on usefulness of applying scheduling algorithms and propose two applicable algorithms in multi-stage pipeline processing systems. The models taken up are intrinsically nonpolynomial and theoretical...
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The authors comment on usefulness of applying scheduling algorithms and propose two applicable algorithms in multi-stage pipeline processing systems. The models taken up are intrinsically nonpolynomial and theoretically intractable. However, not only utilizing given data of processing times but also referring to their stochastic parameters, experiments show that Johnson's algorithm for the flow-shop problem can work effectively within some limitation and new algorithms can extend its applicability. An initial model compares the minimum makespan in the optimum order with a makespan in random order, with given task processing timers drawn from statistical distributions. In a second model, two algorithms are examined for success probability.< >
This paper reviews important aspects of waveform diversity development, and discusses how waveform diversity, distributed processing, spatial diversity, and knowledge-based processing can be integrated for optimum sur...
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This paper reviews important aspects of waveform diversity development, and discusses how waveform diversity, distributed processing, spatial diversity, and knowledge-based processing can be integrated for optimum surveillance system performance. A next-generation surveillance concept is proposed, which is composed of a distributed constellation of autonomous sensors. This presentation was previously presented at the 2008 NATO Lecture Series on Waveform Diversity (SET119).
An optically differential reconfigurable gate array (ODRGA) using a dynamic circuit technique is proposed to reduce the area occupied by the configuration circuit on a VLSI chip. The ODRGA reconfiguration process is p...
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An optically differential reconfigurable gate array (ODRGA) using a dynamic circuit technique is proposed to reduce the area occupied by the configuration circuit on a VLSI chip. The ODRGA reconfiguration process is performed by calculating the difference between previous configuration data stored on a VLSI chip and subsequent optically-supplied configuration data. The reconfiguration circuit of our previously proposed ODRGA using static circuit techniques required a large implementation area. This paper introduces a new dynamic reconfiguration circuit and compares an estimate of its area on the VLSI chip with that obtained by the static technique.
Fault tolerance is an important issue for the design of interconnection networks. In this paper, a new fault tolerant routing algorithm is presented and is applied in mesh networks employing wormhole switching. Due to...
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Fault tolerance is an important issue for the design of interconnection networks. In this paper, a new fault tolerant routing algorithm is presented and is applied in mesh networks employing wormhole switching. Due to its low routing restrictions, the presented routing algorithm is so highly adaptive that it is connected and deadlock free in spite of the various fault regions in mesh networks. Due to the minimal virtual channels it uses, the presented routing algorithm only employs as few buffers as possible and is suitable for fault-tolerant interconnection networks with low cost. Since it chooses the path around fault regions according to the local fault information, the presented routing algorithm takes routing decisions quickly and is applicable in interconnection networks. Moreover, a simulation is conducted for the proposed routing algorithm and the results show that the algorithm exhibits a graceful degradation in performance.
VOV is an automatic manager for VLSI design. It is based on the idea that CAD tools can leave a trace of their execution. The trace is represented as a bipartite directed and acyclic graph, in which the nodes represen...
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VOV is an automatic manager for VLSI design. It is based on the idea that CAD tools can leave a trace of their execution. The trace is represented as a bipartite directed and acyclic graph, in which the nodes represent either design data or CAD transactions. By managing and analyzing the traces, VOV offers a wide variety of services related to design management, such as coordination of team design, automatic execution of CAD transactions, and capture of design history and data dependencies. All of these services are provided in a nonintrusive fashion. VOV has the notion of measurement on the design data, an ingredient which is necessary to provide even more services: tracking of design specifications, validation of design data, and design estimation.< >
This paper deals with the messages scheduling of a CAN (Controller Area Network), based on the distributed control scheme to integrate actuators and sensors in a humanoid robot. In order to supply the distributed proc...
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ISBN:
(纸本)0780387309
This paper deals with the messages scheduling of a CAN (Controller Area Network), based on the distributed control scheme to integrate actuators and sensors in a humanoid robot. In order to supply the distributed processing for a humanoid robot, each control unit should have the efficient control method, fast calculation and valid data exchange. The preliminary study has concluded that the performance of CAN is better and easier to implement than other network such as FIP (Factory Instrumentation Protocol), VAN (Vehicle Area Network), etc. Since a humanoid robot has to treat the significant control signals from many actuators and sensors, the communication time limitation could be critical according to the transmission speed and data length of CAN specification. In this paper, the CAN message scheduling in a humanoid robot was suggested under the presence of Jitter in the message group, the existence of high load of messages over the network and the presence of transmission errors. In addition, the response time under the worst case is compared with the limitation by using the simulation algorithm. As a result, the suggested messages scheduling can guarantee our CAN limitation, and utilize to generate the walking patterns for the humanoid.
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