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IEEE Annual International Computer Software and Applications Conference (COMPSAC)

作者： Zhikun Zhao Wei Li School of Computing Sciences Central Queensland University Rockhampton Australia

Although many approaches to dynamic reconfiguration have been proposed, how the impact of reconfiguration on system QoS can be controlled has not been addressed adequately so far. In this paper, we propose an approach to dynamic reconfiguration of distributed data flow systems. It is an improvement of our previous work for dynamic reconfiguration with QoS management into distributed environment. Our approach has three features. First, it uses version control, flow trace, and reconfiguration scheduling to avoid logical and physical impact on system QoS. Second, it plans a reconfiguration in a totally automatic way. Third, it executes a reconfiguration by a decentralized protocol to reduce reconfiguration time in distributed environment. We adopt our approach to the reconfiguration of a real world application, the data encryption and digital signature system. Experimental results show that our approach has significant advantages in impact control comparing with other existing approaches.

关键词： Quality of service Control systems Automatic control Protocols Communication system control Application software data flow computing Distributed computing Centralized control Environmental management

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Guest Editors' Introduction: Managing Organizational Security

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IEEE Security & Privacy 2007年第3期5卷 13-15页

作者： Shari Lawrence Pfleeger Roland L. Trope Charles C. Palmer RAND Corp. Trope and Schramm LLP IBM Research

In this special issue, we focus on the challenges of managing organizational security, examining some of the nontechnical aspects of security that assure that the technology is chosen, implemented, and used appropriat... 详细信息

关键词： Computer security Information security Business Control systems data flow computing Protection Companies data security Electric breakdown Isolation technology

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The Level 0 trigger decision unit for the LHCb experiment

The Level 0 trigger decision unit for the LHCb experiment

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15th IEEE-NPSS Real-Time Conference (RT 2007), vol.2

作者： Julien Laubser Pascal Perret Herve Chanal Remi Cornat Olivier Deschamps Magali Magne Laboratoire de Physique Corpusculaire Clemson USA

The LHCb experiment is currently being installed at the Large Hadron Collider at CERN (Geneva, Switzerland). In order to reduce the amount of data storage for offline analysis, a trigger system is required. The Level-0 Decision Unit (LODU) is the central part of the first trigger level. It is a full custom 16 layers board using advanced FPGAs in BGA package. The L0DU receives information from the Level-0 sub-triggers (432 bits @ 80MHz) which transmit the data via high speed optical links running at 1.6Gb/s. The processing is implemented using a 40MHz synchronous pipelined architecture. It performs a simple physical algorithm to compute at 40MHz the Level-0 trigger decision in order to reduce the data flow down to 1MHz for the next trigger level. The internal design of the processing FPGA is mainly composed by a Partial data Processing (PDP) and a Trigger Definition Unit (TDU). The aim of the PDP is to adjust the clock phase, perform the time alignment, prepare the data for the TDU and monitor the data processing. The TDU is flexible and allows to fully re-configure all the trigger conditions without any re-programming the FPGAs through the Experiment Control System (ECS).

关键词： Field programmable gate arrays data processing Large Hadron Collider Memory Packaging Optical fiber communication Computer architecture data flow computing Physics computing Process design

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Best Effort Session-Level Congestion Control

Best Effort Session-Level Congestion Control

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The 15th IEEE International Conference on Network Protocols(ICNP 2007)(第15届IEEE国际网络协议大会)

作者： Siddharth Ramesh Sneha Kumar Kasera Microsoft Corporation Redmond USA School of Computing University of Utah

Congestion caused by a large number of interacting TCP flows at a bottleneck network link is different from that caused by a lesser number of flows sending large amounts of data-the former would require cutting down the number of competing flows, while cutting down the data sending rate is sufficient for the latter. However, since existing congestion control schemes view congestion only from a packet- level perspective, they treat both to be the same, resulting in suboptimal performance. We propose two best effort, search-based, session (or flow) level congestion control strategies for the Internet, to complement existing packet-level congestion control schemes. Our strategies control the number of competing flows to optimize for the flow completion rate and the flow completion time. Furthermore, our session control mechanisms do not require any per-flow state or computation at the routers, make no assumption about input traffic characteristics and requirements, avoid starvation of new flows when existing flows do not leave the system, and do not require any end host TCP modifications. Using evaluations under a wide variety of static and varying traffic load conditions, we demonstrate the significant performance and fairness gains that our session control mechanisms provide.

关键词： Level control Internet Control systems Degradation Bandwidth Computer networks data flow computing Telecommunication traffic Performance gain Admission control

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Design Models of Pipelined Units for Digital Signal Processing

Design Models of Pipelined Units for Digital Signal Processi...

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International Conference on CAD Systems in Microelectronics (CADSM)

作者： Iryna Hahanova Yaroslav Miroshnychenko Irina Pobegenko Oleksandr Savvutin DAD Department Kharkiv National University of Radioelectronics Kharkiv Ukraine DAD Department KNURE Ukraine DAD Department KNURE KNURE Russia

In this paper the architectural models of pipelined computing units with system-level description, those essentially decrease the design cycle for digital signal processing products, are offered. Practical realization of the filter, that confirms developed design flow effectiveness with software products Simulink (Mathlab) and Active HDL, Aldec Inc., is given.

关键词： Signal design Digital signal processing Signal processing algorithms Pipeline processing data flow computing Signal processing data processing Automata Digital images Concurrent computing

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Actor-Oriented Modeling and Simulation of Sliding Window Image Processing Algorithms

Actor-Oriented Modeling and Simulation of Sliding Window Ima...

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Embedded Systems for Real-Time Multimedia (ESTIMedia)

作者： Joachim Keinert Joachim Falk Christian Haubelt Jurgen Teich Fraunhofer IIS Erlangen Germany Department of Computer Science 12 University of Erlangen Nuremberg Germany

Embedded real-time image processing systems have to process huge amounts of data with limited resources and energy. Hence high efficiency is not only required for manual, but also for automatic system generation. Therefore, in order to allow for different optimizations, a system specification must be such that important algorithm properties are accessible to the system design software. In this paper, we present a new method how multidimensional image processing algorithms can be modeled by actor-oriented dataflow semantics. Using the example of a binary morphological reconstruction, we investigate the modeling requirements posed by point, local and global image processing algorithms. We show how they can be taken into account in our approach, so that efficient implementation and analysis in terms of buffer size and throughput is possible. In particular, by the explicit specification of the communication behavior, both static and data dependent algorithms are supported allowing for a complete system specification.

关键词： Image processing Algorithm design and analysis Computational modeling Multidimensional systems Image reconstruction Filters Parallel processing data flow computing Scheduling Computer simulation

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Helping Teachers Automate Student Sketch Assessment

Helping Teachers Automate Student Sketch Assessment

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IEEE Symposium on Visual Languages and Human Centric computing (VL/HCC)

作者： Sandra B. Fan University of Washington USA

In this work, we propose a system to enable teachers to more easily automate the assessment of online, student-drawn diagrams. Similar to programming-by-demonstration, teachers specify the correct solutions by drawing their own "solution" diagrams, which the automated assessment system then uses to compare against students' diagrams to see if their diagrams match the solutions.

关键词： Joining processes Natural languages Biology computing data flow computing flowcharts data structures Chemicals Taxonomy Shape Binary search trees

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Exergy Analysis for Performance Optimization of a Steam Turbine Cycle

Exergy Analysis for Performance Optimization of a Steam Turb...

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2007 IEEE Power Engineering Society Conference and Exposition in Africa (IEEE PES PowerAfrica 2007), part 1

作者： Tapan K. Ray Ranjan Ganguly Amitava Gupta Energy & Efficiency Management Group O&M Department NTPC Limited Farakka India Department of Power Engineering Jadavpur University Kolkata India

Exergy analysis of a 500 MWe steam turbine cycle is performed to identify the components that offer significant work potential saving opportunity. Criteria of performance relevant to the individual components are formulated. Exergy flows, exergy consumption due to irreversibilities and rational performance parameters for the turbine cycle and its components are computed by using plant operation data under different conditions. Energy efficiency of the turbine cycle is low due to large energy rejection, but the derived exergy efficiency of the turbine cycle is high due to low exergy rejection from the cycle. Part load operation exhibits lower energy efficiency due to higher energy rejection relative to net output. On the contrary, exergy rejection from the cycle relative to net output does not increase during low load operation. Results show that poor part load exergy efficiency is due to higher exergy destruction relative to net output. Higher pressure feed heaters deal with larger exergy and therefore, need more attention to improve cycle efficiency. Operation and maintenance decisions based on exergy analysis have proved to be more effective in reducing inefficiencies in operating power plant. Exergy-based approach of performance analysis will help practicing power engineers manage energy resources and environment better.

关键词： Performance analysis Optimization Turbines Energy efficiency data flow computing Feeds Power generation Power engineering and energy Energy management Environmental management

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Streaming Random Forests

Streaming Random Forests

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International Symposium on database Engineering and Applications (IDEAS)

作者： Hanady Abdulsalam David B. Skillicorn Patrick Martin School of Computing Queen''s University Kingston ONT Canada

Many recent applications deal with data streams, conceptually endless sequences of data records, often arriving at high flow rates. Standard data-mining techniques typically assume that records can be accessed multiple times and so do not naturally extend to streaming data. Algorithms for mining streams must be able to extract all necessary information from records with only one, or perhaps a few, passes over the data. We present the streaming random forests algorithm, an online and incremental stream classification algorithm that extends Breiman's random forests algorithm. The streaming random forests algorithm grows multiple decision trees, and classifies unlabeled records based on the plurality of tree votes. We evaluate the classification accuracy of the streaming random forests algorithm on several datasets, and show that its accuracy is comparable to the standard random forest algorithm.

关键词： Testing data mining Classification tree analysis Decision trees Predictive models Approximation algorithms Clustering algorithms Robustness Loans and mortgages data flow computing

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Parametric Process Model Inference

Parametric Process Model Inference

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Working Conference on Reverse Engineering

作者： Saurabh Sinha G. Ramalingam Raghavan Komondoor IBM India Research Laboratory India Microsoft Research India India

Legacy applications can be difficult and time-consuming to understand and update due to the lack of modern abstraction mechanisms in legacy languages, as well as the gradual deterioration of code due to repeated maintenance activities. We present an approach for reverse engineering process model abstractions from legacy code. Such a process model can provide a quick initial understanding of an application, and can be a useful starting point for further program exploration. Our approach takes as input a user specification of interesting events, and creates a representation (i.e., a process model) that concisely depicts the occurrences of the events and the possible control-flow among them. The key features of our approach are the use of a logical data model of the program for specifying the events, and graph-projection techniques for creating the process model.

关键词： data models Object oriented modeling Reverse engineering data mining Scattering Portfolios data flow computing Abstracts

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