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Displaying 1-32 out of 32 total
SYNG: A middleware for statefull groupware in mobile environments
Found in: International Conference on Collaborative Computing: Networking, Applications and Worksharing
By Mihail Ionescu, Ivan Marsic
Issue Date:November 2007
pp. 160-167
Computer supported collaboration systems, or groupware, are being used more and more in the real life. In the recent years, we are witnessing an increasing demand for supporting such systems in mobile environments. In this paper we address the following qu...
Performance Modeling and Analysis of the IEEE 802.11 Distribution Coordination Function in Presence of Hidden Stations
Found in: MILCOM
By Fu-yi Hung, Sameer Pai, Ivan Marsic
Issue Date:October 2006
pp. 1-7
In this paper, we propose an analytical model to evaluate the hidden station effect on the performance of the IEEE 802.11 Distributed Coordination Function (DCF). DCF is a random channel-access scheme based on Carrier Sense Multiple Access with Collision A...
Pricing and Charging for QoS
Found in: Autonomic and Autonomous Systems and International Conference on Networking and Services, Joint International Conference on
By Safiullah Faizullah, Ivan Marsic
Issue Date:October 2005
pp. 28
We have introduced and studied a scalable pricing scheme as an effective regulatory tool that provides proper incentives so that users? self-interest will lead them to modify their usage according to their needs. This scheme resulted in better overall netw...
Size Does Matter in Computer Collaboration: Heterogeneous Platform Effects on Human-Human Interaction
Found in: Hawaii International Conference on System Sciences
By Marilyn Tremaine, Aleksandra Sarcevic, Dezhi Wu, Maria C. Velez, Bogdan Dorohonceanu, Allan Krebs, Ivan Marsic
Issue Date:January 2005
pp. 33b
Because today's workforce is highly mobile, small wireless devices are being used to support mobile work collaboration. However, do computer platform differences affect such collaborations? This question is investigated through a controlled experiment that...
A Simplification Architecture for Exploring Navigation Tradeoffs in Mobile VR
Found in: Virtual Reality Conference, IEEE
By Carlos D. Correa, Ivan Marsic
Issue Date:March 2004
pp. 133
Interactive applications on mobile devices often reduce data fidelity to adapt to resource constraints and variable user preferences. In virtual reality applications, the problem of reducing scene graph fidelity can be stated as a combinatorial optimizatio...
Hierarchical Routing Overhead in Mobile Ad Hoc Networks
Found in: IEEE Transactions on Mobile Computing
By John Sucec, Ivan Marsic
Issue Date:January 2004
pp. 46-56
<p><b>Abstract</b>—Hierarchical techniques have long been known to afford scalability in networks. By summarizing topology detail via a hierarchical map of the network topology, network nodes are able to conserve memory and link resources...
Adaptive Applications for Ubiquitous Collaboration in Mobile Environments
Found in: Hawaii International Conference on System Sciences
By Allan Meng Krebs, Ivan Marsic
Issue Date:January 2004
pp. 10031c
The wide availability of networked devices has become one of the main challenges for designers of collaborative applications. Mobile devices are not as
The DISCIPLE System for Collaboration over the Heterogeneous Web
Found in: Hawaii International Conference on System Sciences
By Allan Meng Krebs, Mihail Ionescu, Bogdan Dorohonceanu, Ivan Marsic
Issue Date:January 2003
pp. 46a
With the proliferation of mobile devices we witness an increasing demand for supporting collaboration among users working in the field and in the office. A key component for collaboration in this domain is sharing and manipulation of information using very...
Mobile Adaptive Applications for Ubiquitous Collaboration in Heterogeneous Environments
Found in: Distributed Computing Systems Workshops, International Conference on
By Allan Meng Krebs, Ivan Marsic, Bogdan Dorohonceanu
Issue Date:July 2002
pp. 401
Mobile teamwork applications are often deployed in heterogeneous environments with various devices and connections. To support a broad variety of platforms for mobile teamwork in heterogeneous environments, this paper presents a framework for development o...
Location Management Handoff Overhead in Hierarchically Organized Mobile Ad hoc Networks
Found in: Parallel and Distributed Processing Symposium, International
By John Sucec, Ivan Marsic
Issue Date:April 2002
pp. 0194
Control overhead in a mobile ad hoc network may be reduced through hierarchical routing. However, to facilitate packet forwarding in a hierarchically organized network, each datagram must specify the hierarchical address of the destination. Maintaining and...
Handling Heterogeneity in Networked Virtual Environments
Found in: Virtual Reality Conference, IEEE
By Helmuth Trefftz, Ivan Marsic, Michael Zyda
Issue Date:March 2002
pp. 7
The availability of inexpensive and powerful graphics cards as well as fast Internet connections make Networked Virtual Environments viable for millions of users and many new applications. It is therefore necessary to cope with the growing heterogeneity th...
Adaptive Collaboration for Wired and Wireless Platforms
Found in: IEEE Internet Computing
By Ivan Marsic
Issue Date:July 2001
pp. 26-35
<p>A data-centric architecture for collaboration environments uses XML to adapt shared data dynamically between devices with widely disparate capabilities.</p>
Pricing QoS: Simulation and Analysis
Found in: Simulation Symposium, Annual
By Safiullah Faizullah, Ivan Marsic
Issue Date:April 2001
pp. 0193
Abstract: Ever since its inception, the Internet has seen unprecedented growth. Consequently, researchers have been actively looking for means and ways to influence the behavior of its selfish users. Pricing was soon realized as the regulatory tool to prov...
An Application of Parameter Estimation to Route Discovery By On-Demand Routing Protocols
Found in: Distributed Computing Systems, International Conference on
By John Sucec, Ivan Marsic
Issue Date:April 2001
pp. 0207
Abstract: To discover a route to a peer node, an on-demand routing protocol may initiate a flood-search procedure known as route discovery. By selecting the correct query radius, the number of packet transmissions required for route discovery can be minimi...
Hybrid Cluster Computing with Mobil Objects
Found in: High-Performance Computing in the Asia-Pacific Region, International Conference on
By Liang Cheng, Ajay Wanchoo, Ivan Marsic
Issue Date:May 2000
pp. 909
The hybrid cluster computing is the computing based on the platform of hybrid clusters, which is the computer cluster consisting of both the stationary and mobile computers, interconnected by wireless and wired networks. The study presented in this paper c...
Real-Time Collaboration in Heterogeneous Computing Environments
Found in: Information Technology: Coding and Computing, International Conference on
By Ivan Marsic
Issue Date:March 2000
pp. 222
The recent proliferation of computing devices and the contexts in which they are used demand diversity in collaborative applications as well. The objective of our research is to enable conferees to share applications that are adapted to their (heterogeneou...
A Novel User Interface for Group Collaboration
Found in: Hawaii International Conference on System Sciences
By Bogdan Dorohonceanu, Boi Sletterink, Ivan Marsic
Issue Date:January 2000
pp. 1024
Flexible user interfaces that can be customized to meet the needs of the task at hand are particularly important for real-time group collaboration. This paper presents the user interface of the DISCIPLE (DIstributed System for Collaborative Information Pro...
An Advanced Communication Toolkit for Implementing the Broker Pattern
Found in: Distributed Computing Systems, International Conference on
By Cristian Francu, Ivan Marsic
Issue Date:June 1999
pp. 0458
The Broker pattern is a powerful solution when building middleware communication systems. Existing toolkits, such as BAST, GTS, and ACE, although useful, are insufficient to implement the Broker pattern architecture. These systems concentrate on wrappers f...
An Application Framework for Synchronous Collaboration using Java Beans
Found in: Hawaii International Conference on System Sciences
By Ivan Marsic, Bogdan Dorohonceanu
Issue Date:January 1999
pp. 8018
This paper presents a JavaBeans framework that supports real-time synchronous collaborative applications. We contribute a generic collaboration bus as an enabling virtual
Saliency--Based Visual Representation for Compression
Found in: Image Processing, International Conference on
By Thomas E. Slowe, Ivan Marsic, Caip Center
Issue Date:October 1997
pp. 554
This paper presents a representation for video with application to coding. In recent years, scalability of image compression systems has gained in popularity. Our approach is scalable in the normal sense, but instead of allowing overall image frame quality...
An Architecture for Heterogeneous Groupware Applications
Found in: Software Engineering, International Conference on
By Ivan Marsic
Issue Date:May 2001
pp. 0475
Abstract: The proliferation of wireless networks and small portable computing devices raises the need for applications that are adaptable to heterogeneous computing and communication environments and the contexts in which they are used. However, most curre...
View-Based Object Matching
Found in: Computer Vision, IEEE International Conference on
By Ali Shokoufandeh, Ivan Marsic, Sven J. Dickinson
Issue Date:January 1998
pp. 588
We introduce a novel view-based object representation, called the saliency map graph (SMG), which captures the salient regions of an object view at multiple scales using a wavelet transform. This compact representation is highly invariant to translation, r...
Teamwork Errors in Trauma Resuscitation
Found in: ACM Transactions on Computer-Human Interaction (TOCHI)
By Aleksandra Sarcevic, Ivan Marsic, Randal S. Burd
Issue Date:July 2012
pp. 1-30
Human errors in trauma resuscitation can have cascading effects leading to poor patient outcomes. To determine the nature of teamwork errors, we conducted an observational study in a trauma center over a two-year period. While eventually successful in trea...
Transactive memory in trauma resuscitation
Found in: Proceedings of the ACM 2008 conference on Computer supported cooperative work (CSCW '08)
By Aleksandra Sarcevic, Ivan Marsic, Michael E. Lesk, Randall S. Burd
Issue Date:November 2008
pp. 21-27
This paper describes an ethnographic study conducted to explore the possibilities for future design and development of technological support for trauma teams. We videotaped 10 trauma resuscitations and transcribed each event. Using a framework that we deve...
Quantifying adaptation parameters for information support of trauma teams
Found in: CHI '08 extended abstracts on Human factors in computing systems (CHI '08)
By Aleksandra Sarcevic, Ivan Marsic, Michael E. Lesk, Randall S. Burd
Issue Date:April 2008
pp. 49-54
Trauma centers are stressful, noisy and dynamic environments, with many people performing complex tasks, and with little in the way of information support. Information must be prioritized and filtered to avoid overload or loss. This work quantifies the inf...
"Who's in charge here?" communicating across unequal computer platforms
Found in: ACM Transactions on Computer-Human Interaction (TOCHI)
By Aleksandra Sarcevic, Allan Krebs, Bogdan Dorohonceanu, Ivan Marsic, Maria Velez, Marilyn Mantei Tremaine
Issue Date:December 2004
pp. 407-444
People use personal data assistants in the field to collect data and to communicate with others both in the field and office. The individual in the office invariably has a laptop or a high-end personal workstation and thus, significantly more computing pow...
Asymmetric collaboration through tele-presence
Found in: Proceedings of the 2004 ACM SIGMM workshop on Effective telepresence (ETP '04)
By Allan Krebs, Ashutosh Morde, Carlos Correa, Ivan Marsic, Jun Hou, Lawrence Rabiner, Mourad Bouzit, S. Kicha Ganapathy
Issue Date:October 2004
pp. 57-58
A heterogeneous distributed system that enables people in geographically separate locations to share a common workspace is presented. In particular, the applicability of such a system to the notion of asymmetric collaboration is illustrated by a chess scen...
Stateful publish-subscribe for mobile environments
Found in: Proceedings of the 2nd ACM international workshop on Wireless mobile applications and services on WLAN hotspots (WMASH '04)
By Ivan Marsic, Mihail Ionescu
Issue Date:October 2004
pp. 21-28
The Publish-Subscribe paradigm has become an important architectural style for designing distributed systems. In the recent years, we have been witnessing an increasing demand for supporting publish-subscribe for mobile systems in wireless environments. In...
ViBE: virtual biology experiments
Found in: Proceedings of the tenth international conference on World Wide Web (WWW '01)
By Ivan Marsic, Rajaram Subramanian
Issue Date:May 2001
pp. 316-325
This paper describes the challenges faced by designers in creating accessible systems for the elderly. CARSE, an assessment tool, which has been synthesized and empirically validated of the semantic efficacy of interface metaphor, is used to evaluate two s...
Message caching for local and global resource optimization in shared virtual environments
Found in: Proceedings of the ACM symposium on Virtual reality software and technology (VRST '00)
By Helmuth Trefftz, Ivan Marsic
Issue Date:October 2000
pp. 97-102
The use of Shared Virtual Environments is growing in areas such as multi-player video games, military and industrial training, and collaborative design and engineering. As a result, different mixes of computing power and graphics capabilities of the partic...
Collaboration transparency in the DISCIPLE framework
Found in: Proceedings of the international ACM SIGGROUP conference on Supporting group work (GROUP '99)
By Ivan Marsic, Weicong Wang, Wen Li
Issue Date:November 1999
pp. 326-335
Sharing single-user software applications is a major goal of synchronous groupware particularly because the majority of applications continues to be developed for single users. We present a mechanism for sharing collaboration-transparent single-user applic...
DISCIPLE: a framework for multimodal collaboration in heterogeneous environments
Found in: ACM Computing Surveys (CSUR)
By Ivan Marsic
Issue Date:March 1988
pp. 4-es
This paper presents a framework for sharing JavaBeans applications in real-time synchronous collaboration. A generic collaboration bus provides a plug-and-play environment that enables collaboration with applications that may or may not be collaboration aw...