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International Conference on Distributed computing Systems Workshop

作者： S.K. Prasad A.G. Bourgeois E. Dogdu R. Sunderraman Yi Pan S. Navathe V. Madisetti Computer Science Department Georgia State University Atlanta GA USA College of Computing Georgia Institute of Technology USA Department of Electrical Engineering Georgia Institute of Technology Atlanta GA USA

System of Mobile Devices (SyD) is a middleware we developed that can he used for implementing collaborative, mobile, and distributed applications over heterogeneous devices, data stores, and computing environments. Current prototype implementation of SyD consists of five modules. These modules provide ease of programming in the areas of distributed communication, remote method invocation, service publication and discovery, directory services, distributed service invocation and aggregation, event handling, collaborative link creation and enforcement. A central module is SyDLink which allows SyD-based applications to create "coordination" links. Coordination links represent dependencies among heterogeneous devices and application components. Based on the underlying event-and-trigger mechanism, they allow automatic updates as well as real-lime enforcement of global constraints and interdependencies. SyDLink objects provide the underlying mechanism in SyD to enforce atomic execution of distributed transactions. We explain and demonstrate the use of SyDLink objects via a running example, a collaborative SyD calendar application, throughout the paper.

关键词： Middleware Collaboration Mobile computing Calendars Distributed computing Prototypes Energy management Computer science Educational institutions Application software

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Mobile robots at your fingertip: Bezier curve on-line trajectory generation for supervisory control

Mobile robots at your fingertip: Bezier curve on-line trajec...

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IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： Jung-Hoon Hwang R.C. Arkin Dong-Soo Kwon Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Daejeon South Korea College of Computing Georgia Institute of Technology Atlanta GA USA

A new interfacing method is presented to control mobile robot(s) in a supervised manner. Mobile robots often provide global position information to an operator. This research describes a method whereby the operator controls a mobile robot(s) using his finger or stylus via a touchpad or touch screen interface. Using a mapping between the robot's operational site and the input device, a human user can provide routing information for the mobile robot. Two algorithms have been developed to create the robot trajectory from the operator's input. Information regarding numerous path points is generated when the operator moves his finger/stylus. To prune away meaningless point information, a simple but powerful significant points extracting algorithm is developed. The resulting significant points are used as waypoints. An on-line piecewise cubic Bezier curves (PCBC) trajectory generation algorithm is presented to create a smooth trajectory for these significant points. As the method is based on distance and not on time, the velocity of mobile robot can be controlled easily within its allowable dynamic range. The PCBC trajectory can also be modified on the fly. Simulation results are presented to verify these newly developed methods.

关键词： Mobile robots Supervisory control Data mining Robot control Cognitive robotics Feedback Orbital robotics Mechanical engineering Computer interfaces Mobile computing

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The SWENET project: bridging the gap from bodies of knowledge to curriculum development

The SWENET project: bridging the gap from bodies of knowledg...

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Frontiers in Education (FIE) Conference

作者： M.J. Lutz T.B. Hilburn G.W. Hislop W.M. McCracken M.J. Sebern Department of Software Engineering Rochester Institute of Technology USA Department of Computing Embrey-Riddle Aeronautical University USA College of Information Science and Technology Drexel University USA College of Computing Georgia Institute of Technology USA Department of Electrical Engineering and Computer Science Milwaukee School of Engineering USA

SWENET: The Network Community for Software engineering Education is an NSF funded project to develop curriculum modules of value to faculty member's desiring to incorporate software engineering concepts in new or existing courses. By design, the modules are self-contained instructional units ranging from a single lecture to approximately one week of course material; in this way, instructors can adopt, adapt, and arrange modules as appropriate to their courses. The original goal was to provide appropriate coverage at the undergraduate level for the areas defined in the software engineering body of knowledge. Recently the focus has shifted to the more focused software engineering education body of knowledge developed as part of the computing curricula-software engineering effort. As such, SWENET is evolving to become a repository of course modules that can support a wide range of educational approaches within the general framework defined by these bodies of knowledge.

关键词： Curriculum development Software engineering Knowledge engineering Building materials engineering education Design engineering Computer science Systems engineering and theory Information systems Software prototyping

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Thread transparency in information flow middleware

Thread transparency in information flow middleware

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作者： Koster, Rainer Black, Andrew P. Huang, Jie Walpole, Jonathan Pu, Calton Fachbereich Informatik Universität Kaiserslautern Postfach 3049 67653 Kaiserslautern Germany Dept. of Comp. Sci. and Engineering OGI Sch. of Science and Engineering Oregon Health and Science University 20000 NW Walker Road Beaverton OR 97006-8921 United States College of Computing Georgia Institute of Technology Atlanta GA 30332-0280 United States

Applications that process continuous information flows are challenging to write because the application programmer must deal with flow-specific concurrency and timing requirements, necessitating the explicit management of threads, synchronization, scheduling and timing. We believe that middleware can ease this burden, but many middleware platforms do not match the structure of these applications, because they focus on control-flow centric interaction models such as remote method invocation. Indeed, they abstract away from the very things that the information-flow centric programmer must control. This paper describes Infopipes - a new high-level abstraction for information flow applications - and a middleware framework that supports them. Infopipes handle the complexities associated with control flow and multi-threading, relieving the programmer of these tasks. Starting from a high-level description of an information flow pipeline, the framework determines which parts of a pipeline require separate threads or coroutines, and handles synchronization transparently to the application programmer. The framework also gives the programmer the freedom to write or reuse components in a passive style, even though the configuration will actually require the use of a thread or coroutine. Conversely, it is possible to write a component using a thread and know that the thread will be eliminated if it is not needed in a pipeline. This allows the most appropriate programming model to be chosen for a given task, and existing code to be reused irrespective of its activity model. Copyright © 2003 John Wiley & Sons, Ltd.

关键词： Middleware

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Experiential telepresence: How can telepresence research be guided towards better end user experience?

Experiential telepresence: How can telepresence research be ...

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2003 ACM SIGMM Workshop on Experiential Telepresence, ETP '03

作者： Hayes-Roth, Barbara Henderson, Austin Jain, Ramesh Manovich, Lev Welch, Greg Pingali, Gopal Extempo Systems Inc. United States MIT United States Systems Laboratory in the Advanced Concepts and Technology Group of Pitney Bowes United States School of Electrical and Computer Engineering College of Computing Georgia Institute of Technology United States Department of Computer Science and Engineering University of Michigan Ann Arbor MI United States University of California San Diego CA United States Visual Arts Department University of California San Diego CA United States Computer Science Department University of North Carolina Chapel Hill NC United States IEEE Computer Society ACM United States IBM T.J. Watson Research Center 19 Skyline Drive Hawthorne NY 10532 United States

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Multiple instance learning of real valued data

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The Journal of Machine Learning Research 2003年 3卷

作者： Daniel R. Dooly Qi Zhang Sally A. Goldman Robert A. Amar Department of Computer Science Southern Illinois University Edwardsville Edwardsville IL Department of Computer Science and Engineering Washington University St. Louis MO Georgia Institute of Technology College of Computing 801 Atlantic Drive Atlanta GA

The multiple-instance learning model has received much attention recently with a primary application area being that of drug activity prediction. Most prior work on multiple-instance learning has been for concept learning, yet for drug activity prediction, the label is a real-valued affinity measurement giving the binding strength. We present extensions of k-nearest neighbors (k-NN), Citation-kNN, and the diverse density algorithm for the real-valued setting and study their performance on Boolean and real-valued data. We also provide a method for generating chemically realistic artificial data.

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Software bubbles: using predication to compensate for aliasing in software pipelines

Software bubbles: using predication to compensate for aliasi...

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International Conference on Parallel Architecture and Compilation Techniques (PACT)

作者： B. Goldberg E. Crutcher C. Huneycutt K. Palem Department of Computer Science New York University NY USA College of Computing and Department of Electrical and Computer Engineering Georgia Institute of Technology GA USA

This paper describes a technique for utilizing predication to support software pipelining on EPIC architectures in the presence of dynamic memory aliasing. The essential idea is that the compiler generates an optimistic software-pipelined schedule that assumes there is no memory aliasing. The operations in the pipeline kernel are predicated, however so that if memory aliasing is detected by a run-time check, the predicate registers are set to disable the iterations that are so tightly overlapped as to violate the memory dependences. We refer to these disabled kernel operations as software bubbles.

关键词： Pipeline processing Kernel Computer architecture Computer science Educational institutions Optimizing compilers Processor scheduling Runtime Registers Dynamic compiler

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The minimal buffering requirements of congestion controlled interactive multimedia applications 1

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8th International Workshop on Interactive Distributed Multimedia Systems, IDMS 2001

作者： Li, Kang Krasic, Charles Walpole, Jonathan Shor, Molly H. Pu, Calton Oregon Graduate Institute Department of Computer Science and Engineering United States Oregon State University Electrical and Computer Engineering Department United States Georgia Institute of Technology College of Computing United States

ISBN: (数字)9783540447634

ISBN: (纸本)3540425306

This paper uses analysis and experiments to study the minimal buffering requirements of congestion controlled multimedia applications. Applications in the Internet must use congestion control protocols, which vary transmission rates according to network conditions. To produce a smooth perceptual quality, multimedia applications use buffering and rate adaptations to compensate these rate oscillations. While several adaptation policies are available, they require different amounts of buffering at end-hosts. We study the relationship between buffering requirements and adaptation policies. In particular, we focus on a widely pursued policy that adapts an application.s sending rate exactly to the average available bandwidth to maximize throughput. Under this adaptation policy, at least a minimal amount of buffering is required to smooth the rate oscillation inherent in congestion control, and we view this minimal buffering requirement as a cost of maximizing throughput. We derive the minimal buffering requirement for this policy assuming that applications use an additive-increase-and-multiplicative-decrease (AIMD) algorithm for congestion control. The result shows the relationship between parameters of AIMD algorithms and the delay cost. We show that the buffering requirement is proportional to the parameters of the AIMD algorithm and quadratic to the application.s sending rate and round-trip-time. We verify this relationship through experiments. Our results indicate that adaptation policies that maximize throughput are not suitable for interactive applications with high bit rates or long round-trip-times. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Throughput

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The emerging power crisis in embedded processors: What can a poor compiler do? 2

The emerging power crisis in embedded processors: What can a...

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2nd International Conference on Compilers, Architecture, and Synthesis for Embedded Systems, CASES 2001

作者： Chakrapani, L.N. Korkmaz, P. Mooney, V.J. Palem, K.V. Puttaswamy, K. Wong, W.F. College of Computing Georgia Institute of Technology AtlantaGA30332 United States School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States Dept. of Computer Science National University of Singapore Singapore117543 Singapore

ISBN: (纸本)1581133995

It is widely acknowledged that even as VLSI technology advances, there is a looming crisis that is an important obstacle to the widespread deployment of mobile embedded devices, namely that of power. This problem can be tackled at many filevels like devices, logic, operating systems, micro-architecture and compiler. While there have been various proposals for specific compiler optimizations for power, there has not been any attempt to systematically map out the space for possible improvements. In this paper, we quantitatively characterize the limits of what a compiler can do in optimizing for power using precise modeling of a state-of-the-art embedded processor in conjunction with a robust compiler. We provide insights to how compiler optimizations interact with the internal workings of a processor from the perspective of power consumption. The goal is to point out the promising and not so promising directions of work in this area, to guide the future compiler designer. Copyright 2001 ACM.

关键词： Program compilers

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The challenge of collaborative learning in engineering and math

The challenge of collaborative learning in engineering and m...

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Frontiers in Education (FIE) Conference

作者： M. Guzdial P. Ludovice M. Realff T. Morley K. Carroll A. Ladak College of Computing Georgia Institute of Technology Atlanta GA USA School of Chemical Engineering College of Engineering Georgia Institute of Technology Atlanta GA USA School of Mathematics College of Science Georgia Institute of Technology Atlanta GA USA College of Computing USA

The CoWeb is a collaborative learning technology used in many classes (over 100) at georgia institute of technology (georgia Tech), USA. The authors present evidence of the success of the tool in supporting learning at a low cost. They also provide anecdotes about the active resistance they have received to use of the CoWeb in engineering, mathematics and some computer science classes. Evidence from interviews and questionnaires points to some of the sources for this resistance.

关键词： Collaborative work Collaboration Educational institutions Costs Mathematics Chemical technology Computer science Educational technology Computer science education Accreditation

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