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检索条件"任意字段=13th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications"

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Adding Asynchronous Recording Module running on Distance Video conference followed by an external classroom monitoring system 13

Adding Asynchronous Recording Module running on Distance Vid...

引用

13th international conference on Computers and their applications, CATA 1998

作者： Kwon, Hee Choon Jeon, Jin Ho Hwang, Dae Joon Shin, Dongil Seo, Youngho Department of Information Engineering Sung Kyun Kwan University 300 Chunchnn-Dong Jangan-Ku Suwon440-746 Korea Republic of Sensitivity Engineering Department Reality Recognition Lab 1 Ueun-dong Yusong-gu Taejon 305-333 Korea Republic of

ISBN: (纸本)9781618395443

the traditional distance education systems consist of multiple parts such as white-board, audio support, toolbox for controlling user-preference, and additional environmental functions. A typical distance video conferencing system must be capable of managing sessions, accessing control functions, controlling networks and media. However, these traditional functions are not enough to provide efficient remote conference. So that we introduce an asynchronous interactive recording subsystem embedded on external classroom monitoring system. this subsystem with educational systems convering several remote campuses provides efficient remote lecture sessions using a surveillance system. Furthermore, the external classroom monitoring system can run on ISDN public lines or high-speed digital network. the External Classroom Monitoring System (ECMS) transfers the real-time video scenes of each classroom to chairman of the lecture or the host of control center while decreasing the network traffic load for sending video data. It also has a special feature to reduce additional communication cost while the classroom is empty. the ECMS also acts as a guarding system to protect the real estates and save human lives from the sudden accidents at substantially low cost since the system can store the actual real-time scenes on a permanent storage at remote site through the public ISDN line. We implemented Asynchronous Recording Module (ARM) to save the live video onto a temporary buffer and store the content of the buffer pe manently at a certain time of point. It can record the video onto various external recording devices such as hard disk drive, Zip drive, and video tapes etc. © 13th international conference on Computers and their applications 1998, CATA 1998. All rights reserved.

关键词： and Guarding System Classroom Monitoring Distance Education Distributed ISDN Multimedia Object

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Hybrid-th: a hybrid access mechanism for real-time memory-resident database systems

Hybrid-TH: a hybrid access mechanism for real-time memory-re...

引用

ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Chanho Ryu Eunmi Song Booseon Jun Young-Kuk Kim Seongil Jin Department of Computer Science Chungnam National University Taejon South Korea

ISBN: (纸本)081869209X

the objective of this paper is to develop a high performance access mechanism for real-time memory-resident database systems. real-time systems have very important properties: timeliness and predictability. In conventional database systems, hashing is known faster than tree access mechanism on the simple searches. Hence, on some environments, hash can be more appropriate to the real-time applications. On the other hand, tree index mechanism, it is possible to search to a range of specific data. Depending on the distance of a node in the tree, however, each access time to a node in the tree is different. this feature is not desirable for real-time database application, which requires deterministic data access behavior. In this paper, we present a new combined access mechanism called Hybrid Tree-Hash (Hybrid-th) mechanism. this mechanism is a complementary integration of tree-index and hash-index structure assuring that a Worst-Case Execution time is bounded within a specific time, especially, when range search operation works. Our analysis shows that Hybrid-th provides the predictability of data access operation in real-time memory-resident database systems (DBMS).

关键词： real time systems Database systems Radar tracking Transaction databases Timing Computer science Spatial databases Information retrieval Delay effects Semiconductor memory

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Parallel real-time systems: Formal specification

Parallel real-time systems: Formal specification

引用

Proceedings of the 1997 4th international conference on High Performance computing, HiPC

作者： Choudhary, Alok N. Gehlot, Vijay Narahari, Bhagirath Northwestern Univ Evanston United States

For many real-time applications, parallel computers offer a natural computing platform. However, very little attention has been paid to software support for real-time embedded systems on parallel machines. this paper addresses the problem of formal software specification for parallel real-time systems, and presents some features of a formal specification language - PRETSEL (Parallel real-time SpEcification Language). the syntax of PRETSEL is presented and the formal semantic rules are defined. the effectiveness of PRETSEL is demonstrated through the specification of the functionality and timing requirements of a Sonar system.

关键词： Parallel processing systems

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High-performance scalable computing for real-time applications

High-performance scalable computing for real-time applicatio...

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6th international conference on Computer Communications and Networks

作者： Boggess, T Shirley, F Lockheed Martin Co

ISBN: (纸本)0818681861

Sanders is integrating emerging interconnect technologies with other high-performance computing technologies to meet the demanding requirements of future, real-time, embedded military applications. Myrinet, a switched network, is used to connect heterogeneous compute nodes in a low-latency, high-throughput System Area Network (SAN). Myrinet includes a standardized intelligent, node-to-network interface, called a LANai, which isolates each node from the network. Types of nodes under development include Digital Signal Processor (DSP), Reduced instruction Set computing (RISC), and Reconfigurable computing (RC). Modeling and simulation of the computing system are performed within the Ptolemy environment. High Density interconnect (HDI) packaging reduces Size, Weight And Power (SWAP), a requirement especially important for avionics applications. PacketWay, an Internet Engineering Task Force (IETF) proposed standard, provides a high-performance interface between heterogeneous SANs, and includes an option for highspeed inter-SAN encryption. A prototype high-performance scalable computer is being built at Sanders with this set of technologies, to meet the requirements of several future military programs.

关键词： Data communication systems

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Periodic retrieval of videos from disk arrays

Periodic retrieval of videos from disk arrays

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13th international conference on Data Engineering

作者： Ozden, B Rastogi, R Silberschatz, A Bell Lab Murray Hill United States

ISBN: (纸本)0818678089

A growing number of applications need access to video data stored in digital form an secondary storage devices (e.g., video-on-demand, multimedia messaging). As a result, video sewers that are responsible for the storage and retrieval, at fixed rates, of hundreds of videos from disks are becoming increasingly important. Since video data tends to be voluminous, several disks are usually used in order to store the videos. A challenge is to devise schemes for the storage and retrieval of videos that distribute the workload evenly across disks, reduce the cost of the server and at the same time, provide good response times to client requests for video data. In this paper we present schemes that retrieve videos periodically from disks in order to provide better response times to client requests. We present two schemes that stripe videos across multiple dish in order to distribute the workload uniformly among them. For the two striping schemes, we show that the problem of retrieving videos periodically is equivalent to that of scheduling periodic tasks on a multiprocessor For the multiprocessor scheduling problems, we present and compare schemes for computing start times for the tasks, if it is determined that they are scheduleable.

关键词： Information retrieval systems

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Priority ceiling protocol with dynamic adjustment of serialization order

Priority ceiling protocol with dynamic adjustment of seriali...

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Proceedings of the 1997 ieee 13th international conference on Data Engineering, ICDE

作者： Lam, Kwok-wa Son, Sang H. Hung, Sheung-lun City Univ of Hong Kong Kowloon Hong Kong

ISBN: (纸本)0818678070

the difficulties of providing a guarantee of meeting transaction deadlines in hard real-time database systems lie in the problems of priority inversion and of deadlocks. Priority inversion and deadlock problems ensue when concurrency control protocols are adapted in priority-driven scheduling. the blocking delay due to priority inversion can be unbounded, which is unacceptable in the mission-critical real-time applications. Some priority ceiling protocols have been proposed to tackle these two problems. However, they are too conservative in scheduling transactions for the single-blocking and deadlock-free properties, leading to many unnecessary transaction blockings. In this paper, we analyze the unnecessary transaction blocking problem inherent in these priority ceiling protocols and investigate the conditions for allowing a higher priority transaction to preempt a lower priority transaction using the notion of dynamic adjustment of serialization order. A new priority ceiling protocol is proposed to solve the unnecessary blocking problem, thus enhancing schedulability. We also devise the worst-case schedulability analysis for the new protocol which provides a better schedulability condition than other protocols.

关键词： Database systems

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9th international conference on Modeling Techniques and Tools for Computer Performance Evaluation, 1997

9th International Conference on Modeling Techniques and Tool...

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9th international conferences on Modeling Techniques and Tools for Computer Performance Evaluation, 1997

ISBN: (纸本)9783540631019

the proceedings contain 18 papers. the special focus in this conference is on Modeling Techniques and Tools for Computer Performance Evaluation. the topics include: A performability modeling environment tool;dependability evaluation and the optimization of performability;design and implementation of a network computing platform using JAVA;storage alternatives for large structured state spaces;an efficient disk-based tool for solving very large markov models;efficient transient overload tests for real-time systems;towards an analytical tool for performance modeling of ATM networks by decomposition;an embedded network simulator to support network protocols’ development;synchronized two-way voice simulation for internet phone performance analysis and evaluation;processes as language-oriented building blocks of stochastic petri nets;measurement tools and modeling techniques for evaluating WEB server performance;workload characterization of input/output intensive parallel applications;interval based workload characterization for distributed systems;bounding the loss rates in a multistage ATM switch;simple bounds for queues fed by markovian sources and on queue length moments in fork and join queuing networks with general service times.

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A scalable codec for Internet video streaming

A scalable codec for Internet video streaming

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international conference on Digital Signal Processing (DSP)

作者： B. Girod U. Horn Telecommunications Institute University of Erlangen Nuremberg Erlangen Germany

Information systems and distributed applications for the Internet show a growing demand for real-time audiovisual services. Support for these services in the Internet protocol layer will be widely available in the near future. Nevertheless, the heterogeneous structure of the Internet remains a great obstacle for establishing real-time video services. Scalable video codecs, generating bit-streams decodable at different rates, have been proposed to address the heterogeneity problem. We present a scalable video codec based on a spatio-temporal resolution pyramid combined with lattice vector quantization as an efficient compression technique. this approach can encode embedded lower bit-rate layers at the same overall bit-rate as needed by H.263 single-layer coding. the complexity of the codec is sufficiently low to allow software-only implementations of Internet video services. this is demonstrated by means of an implemented World Wide Web video server application.

关键词： Streaming media Web and internet services Video compression Video codecs Information systems real time systems Protocols Decoding Lattices Vector quantization

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real-time single-workstation obstacle avoidance using only wide-field flow divergence

Real-time single-workstation obstacle avoidance using only w...

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13th international conference on Pattern Recognition, ICPR 1996

作者： Camus, Ted Coombs, David Herman, Martin Hong, Tsai-Hong National Institute of Standards and Technology Intelligent Systems Division Building 220 Gaithersburg MD 20899 United States

ISBN: (纸本)081867282X

A real-time robot vision system is described which uses only the divergence of the optical flow field for both steering control and collision detection. the robot has wandered about the lab at 20 cm/s for as long as 26 minutes without collision. the entire system is implemented on a single ordinary UNIX workstation without the benefit of real-time operating system support. Dense optical flow data are calculated in real-time across the entire wide-angle image. the divergence of this optical flow field is calculated everywhere and used to control steering and collision behavior. Divergence alone has proven sufficient for steering past objects and detecting imminent collision. the major contribution is the demonstration of a simple, robust, minimal system that uses flow-derived measures to control steering and speed to avoid collision in real time for extended periods. Such a system can be embedded in a general, multi-level perception/control system. © 1996 ieee.

关键词： Optical flows

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Monitoring contact using clustering and discriminant functions

Monitoring contact using clustering and discriminant functio...

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Proceedings of the 1996 13th ieee international conference on Robotics and Automation. Part 1 (of 4)

作者： Sikka, Pavan McCarragher, Brenan J. Australian Natl Univ Canberra

Many robotic tasks are easily described using discrete event dynamic systems. However, the robot sensory and control systems operate in the continuous domain, leading to the problem of associating states of the continuous system with the states and events (changes in state) in the discrete task space. this paper presents a new approach to discretizing sensory data, based on discriminant functions and clustering techniques, for applications in robotic process monitoring and in interpreting human sensory data. the discriminant functions are learned from real sensory data, and hence the approach has the advantages of being adaptive, and also of taking into account various task parameters such as friction. Most importantly, the approach can be adapted quickly to different tasks by simply learning a new set of discriminant functions from sensory data corresponding to the task. Experimental results are presented to demonstrate the effectiveness of this approach.

关键词： Discrete time control systems

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