676,758 research outputs found
Proceedings of the ECSCW'95 Workshop on the Role of Version Control in CSCW Applications
The workshop entitled "The Role of Version Control in Computer Supported Cooperative Work Applications" was held on September 10, 1995 in Stockholm, Sweden in conjunction with the ECSCW'95 conference. Version control, the ability to manage relationships between successive instances of artifacts, organize those instances into meaningful structures, and support navigation and other operations on those structures, is an important problem in CSCW applications. It has long been recognized as a critical issue for inherently cooperative tasks such as software engineering, technical documentation, and authoring. The primary challenge for versioning in these areas is to support opportunistic, open-ended design processes requiring the preservation of historical perspectives in the design process, the reuse of previous designs, and the exploitation of alternative designs.
The primary goal of this workshop was to bring together a diverse group of individuals interested in examining the role of versioning in Computer Supported Cooperative Work. Participation was encouraged from members of the research community currently investigating the versioning process in CSCW as well as application designers and developers who are familiar with the real-world requirements for versioning in CSCW. Both groups were represented at the workshop resulting in an exchange of ideas and information that helped to familiarize developers with the most recent research results in the area, and to provide researchers with an updated view of the needs and challenges faced by application developers. In preparing for this workshop, the organizers were able to build upon the results of their previous one entitled "The Workshop on Versioning in Hypertext" held in conjunction with the ECHT'94 conference. The following section of this report contains a summary in which the workshop organizers report the major results of the workshop. The summary is followed by a section that contains the position papers that were accepted to the workshop. The position papers provide more detailed information describing recent research efforts of the workshop participants as well as current challenges that are being encountered in the development of CSCW applications. A list of workshop participants is provided at the end of the report.
The organizers would like to thank all of the participants for their contributions which were, of course, vital to the success of the workshop. We would also like to thank the ECSCW'95 conference organizers for providing a forum in which this workshop was possible
Analytical Model of TCP Relentless Congestion Control
We introduce a model of the Relentless Congestion Control proposed by Matt
Mathis. Relentless Congestion Control (RCC) is a modification of the AIMD
(Additive Increase Multiplicative Decrease) congestion control which consists
in decreasing the TCP congestion window by the number of lost segments instead
of halving it. Despite some on-going discussions at the ICCRG IRTF-group, this
congestion control has, to the best of our knowledge, never been modeled. In
this paper, we provide an analytical model of this novel congestion control and
propose an implementation of RCC for the commonly-used network simulator ns-2.
We also improve RCC with the addition of a loss retransmission detection scheme
(based on SACK+) to prevent RTO caused by a loss of a retransmission and called
this new version RCC+. The proposed models describe both the original RCC
algorithm and RCC+ improvement and would allow to better assess the impact of
this new congestion control scheme over the network traffic.Comment: Extended version of the one presented at 6th International Workshop
on Verification and Evaluation of Computer and Communication Systems (Vecos
2012
Quantum control in foundational experiments
We describe a new class of experiments designed to probe the foundations of
quantum mechanics. Using quantum controlling devices, we show how to attain a
freedom in temporal ordering of the control and detection of various phenomena.
We consider wave-particle duality in the context of quantum-controlled and the
entanglement-assisted delayed-choice experiments. Then we discuss a
quantum-controlled CHSH experiment and measurement of photon's transversal
position and momentum in a single set-up.Comment: Contribution to the Proceedings of the workshop Horizons of Quantum
Physics, Taipei, 14-18.10.2012. Published version: two new authors, modified
and streamlined presentation, new section on quantum control in complementary
position/momentum measurement
Noether's Theorem for Fractional Optimal Control Problems
We begin by reporting on some recent results of the authors (Frederico and
Torres, 2006), concerning the use of the fractional Euler-Lagrange notion to
prove a Noether-like theorem for the problems of the calculus of variations
with fractional derivatives. We then obtain, following the Lagrange multiplier
technique used in (Agrawal, 2004), a new version of Noether's theorem to
fractional optimal control systems.Comment: To be presented at FDA'06 - 2nd IFAC Workshop on Fractional
Differentiation and its Applications, 19-21 July 2006, Porto, Portugal.
Accepted (07-March-2006) for the Conference Proceeding
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