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Nahrstedt, Klara

Overview
Works: 99 works in 188 publications in 1 language and 1,646 library holdings
Genres: Conference papers and proceedings 
Roles: Author, Editor, Other
Classifications: TK5105.5, 006.7
Publication Timeline
Key
Publications about Klara Nahrstedt
Publications by Klara Nahrstedt
Most widely held works by Klara Nahrstedt
Multimedia : computing, communications, and applications by Ralf Steinmetz( Book )
12 editions published between 1995 and 2012 in English and held by 292 libraries worldwide
Multimedia systems by Ralf Steinmetz( Book )
13 editions published between 1995 and 2011 in English and held by 247 libraries worldwide
The goal of Multimedia Systems is to provide a broad understanding of multimedia systems and applications in an integrated manner. A user can enjoy a multimedia application only if all the pieces of the end-to-end solution fit together. This means that a multimedia application must be developed in integrated fashion, taking into account the underlying technology described here. In this volume, we present fundamental characteristics and properties of multimedia operating and communication systems. Of special interest to readers will be those chapters dealing with scheduling algorithms and other OS-supporting approaches for multimedia applications, with their soft-real-time deadlines; multimedia file system internals and servers, with their decision algorithms for data placement and scheduling; multimedia communication, transport, and streaming protocols and services, with their error control, congestion control and other Quality of Service awareness and adaptive algorithms; synchronization services, with their skew control methods; and group communications, with their group coordinating algorithms and other distributed services. Ralf Steinmetz is Professor of Multimedia Communications at the Technische Universität Darmstadt, Germany, and he is chairman of the Board of the Telemedia Center httc. Together with more than 20 researchers, he is working towards his vision of "truly seamless multimedia communications". He has co-authored over 200 refereed publications, serves as a member of the board of numerous professional committees, is an ICCC Governor, and is a Fellow of both the IEEE and the ACM. Klara Nahrstedt is the Ralph and Catherine Fisher Professor at the department of Computer Science, University of Illinois at Urban-Champagne, USA. She is an expert in the area of multimedia systems and networks and focuses on quality of service management problems. Currently, she serves as the editor-in-chief of the ACM/Springer Multimedia Systems Journal
Multimedia applications by Ralf Steinmetz( Book )
11 editions published between 2004 and 2011 in English and held by 226 libraries worldwide
Multimedia Applications discusses the basic characteristics of multimedia document handling, programming, security, human computer interfaces, and multimedia application services. The overall goal of the book is to provide a broad understanding of multimedia systems and applications in an integrated manner. A user enjoys a multimedia application only if all pieces of the end-to-end solution fit together. This means that a multimedia application and its user interface must be developed in an integrated fashion with underlying multimedia middleware, operating systems, networks, security, and multimedia devices. In this book we will present fundamental information and properties of hypermedia document handling, multimedia security and various aspects of multimedia applications. Especially of interest to the readers will be information about document handling and their standards, programming of multimedia applications, design of multimedia information at human computer interfaces, multimedia security challenges such as encryption and watermarking, multimedia in education, as well as multimedia applications to assist preparation, processing and application of multimedia content. Ralf Steinmetz is Professor of Multimedia Communications at the Technische Universität Darmstadt, Germany, and he is chairman of the Board of the Telemedia Center httc. Together with more than 20 researchers, he is working towards his vision of "truly seamless multimedia communications". He has co-authored over 200 refereed publications, serves as a member of the board of numerous professional committees, is an ICCC Governor, and is a Fellow of both the IEEE and the ACM. Klara Nahrstedt is the Ralph and Catherine Fisher Professor at the department of Computer Science, University of Illinois at Urban-Champagne, USA. She is an expert in the area of multimedia systems and networks and focuses on quality of service management problems. Currently, she serves as the editor-in-chief of the ACM/Springer Multimedia Systems Journal
Multimedia fundamentals by Ralf Steinmetz( Book )
26 editions published between 2002 and 2011 in English and held by 169 libraries worldwide
The state-of-the-art in multimedia content analysis, media foundations, and compression Covers digital audio, images, video, graphics, and animation Includes real-world project sets that help you build and test your expertise By two of the world's leading experts in advanced multimedia systems development The practical, example-rich guide to media coding and content processing for every multimedia developer. From DVDs to the Internet, media coding and content processing are central to the effective delivery of high-quality multimedia. In this book, two of the field's leading experts introduce today's state-of-the-art, presenting realistic examples and projects designed to help implementers create multimedia systems with unprecedented performance. Ralf Steinmetz and Klara Nahrstedt introduce the fundamental characteristics of digital audio, images, video, graphics, and animation; demonstrate powerful new approaches to content analysis and compression; and share expert insights into system and end-user issues every advanced multimedia professional must understand. Coverage includes: Generic characteristics of multimedia and data streams, and their impact on multimedia system design Essential audio concepts and representation techniques: sound perception, psychoacoustics, music, MIDI, Speech signals, and related I/O and transmission issues Graphics and image characteristics: image formats, analysis, synthesis, reconstruction, and output Video signals, television formats, digitization, and computer-based animation issues Fundamental compression methods: run-length, Huffman, and subband coding Multimedia compression standards: JPEG, H.232, and various MPEG techniques Optical storage technologies and techniques: CD-DA, CD-ROM, DVD, and beyond Content processing techniques: Image analysis, video processing, cut detection, and audio analysis First in an authoritative 3-volume set on tomorrow's robust multimedia desktop: real-time audio, video, and streaming media. Multimedia Fundamentals offers a single, authoritative source for the knowledge and techniques you need to succeed with any advanced multimedia development project. Look for Volume 2 focusing on networking and operating system-related issues, and Volume 3 focusing on service and application issues
Multimedia computing and networking 2000 : 24-26 January, 2000, San Jose, California ( Book )
13 editions published between 1999 and 2000 in English and held by 65 libraries worldwide
Building QoS into distributed systems : IFIP TC6 WG6.1 Fifth International Workshop on Quality of Service (IWQOS '97), 21-23 May 1997, New York, USA by IFIP TC6 WG6.1 International Workshop on Quality of Service( Book )
8 editions published in 1997 in English and held by 53 libraries worldwide
This volume contains the Fifth International Workshop, Quality of Service, sponsored by the International Federation for Information Processing (IFIP), and held in May 1997, Columbia University New York USA. This book is essential reading for engineers and R & D students, and for researchers in multimedia networking areas
Quality of service in wireless networks over unlicensed spectrum by Klara Nahrstedt( Book )
7 editions published between 2011 and 2012 in English and Undetermined and held by 14 libraries worldwide
This Synthesis Lecture presents a discussion of Quality of Service (QoS) in wireless networks over unlicensed spectrum. The topic is presented from the point of view of protocols for wireless networks (e.g., 802.11) rather than the physical layer point of view usually discussed for cellular networks in the licensed wireless spectrum. A large number of mobile multimedia wireless applications are being deployed over WiFi (IEEE 802.11) and Bluetooth wireless networks and the number will increase in the future as more phones, tablets, and laptops are equipped with these unlicensed spectrum wireles
Multimedia fundamentals, Volume 1 by Ralf Steinmetz( file )
1 edition published in 2002 in English and held by 12 libraries worldwide
End-to-end QoS guarantees : lessons learned from OMEGA by Klara Nahrstedt( Book )
1 edition published in 1996 in English and held by 8 libraries worldwide
A tuning system for distributed multimedia applications by Klara Nahrstedt( Book )
1 edition published in 1996 in English and held by 8 libraries worldwide
A soft real time scheduling server in UNIX operating system by Hao-hua Chu( Book )
1 edition published in 1997 in English and held by 7 libraries worldwide
Efficient On-Demand Operations in Large-Scale Infrastructures by Steven Y Ko( file )
1 edition published in 2009 in English and held by 5 libraries worldwide
In large-scale distributed infrastructures such as clouds, Grids, peer-to-peer systems, and wide-area testbeds, users and administrators typically desire to perform on-demand operations that deal with the most up-to-date state of the infrastructure. However, the scale and dynamism present in the operating environment make it challenging to support on-demand operations efficiently, i.e., in a bandwidth- and response-efficient manner. This dissertation discusses several on-demand operations, challenges associated with them, and system designs that meet these challenges. Specifically, we design and implement techniques for 1) on-demand group monitoring that allows users and administrators of an infrastructure to query and aggregate the up-to-date state of the machines (e.g., CPU utilization) in one or multiple groups, 2) on-demand storage for intermediate data generated by dataflow programming paradigms running in clouds, 3) on-demand Grid scheduling that makes worker-centric scheduling decisions based on the current availability of compute nodes, and 4) on-demand key/value pair lookup that is overlay-independent and perturbation-resistant. We evaluate these on-demand operations using large-scale simulations with traces gathered from real systems, as well as via deployments over real testbeds such as Emulab and PlanetLab
Multimedia and security : workshop at ACM Multimedia '98, Bristol, U.K., September 12 - 13, 1998 by Jana Dittmann( Book )
2 editions published in 1999 in English and held by 4 libraries worldwide
Panorama: a multimedia happening ( visu )
2 editions published in 2008 in English and held by 4 libraries worldwide
Live dance juxtaposed with large - and small-scale projections using robotic cameras and tele-immersion and audio technologies. At the center of Panorama are 22 dancers, including UC Berkeley students and members of the dance theater company Smith/Wymore Disappearing Acts. They perform choreographed movement -- including excerpts from Merce Cunningham's work -- plus movement structures co-authored by computers through a series of alogrithms with recited text derived from computational models
Characterizing and leveraging people movement for content distribution in mobile Peer-to-Peer networks by Long H Vu( file )
1 edition published in 2011 in English and held by 2 libraries worldwide
In this thesis, we present a framework to characterize and leverage people movement for improvements of content distribution in mobile Peer-to-Peer (P2P) networks. Particularly, we study two typical classes of people movement including the Schelling behavior and repetitive behavior. The Schelling behavior exists in real-world scenarios where co-located people collaboratively share mutual content interest when they are moving towards the same Point of Interest such as shopping mall, football stadium, and outdoor concert. Meanwhile, the repetitive behavior of people movement can be found in numerous places where people visit regular locations and make regular social contacts for their daily routines such as university campuses and work places. For the first part of the thesis, we start by analyzing the original segregation model proposed by Thomas Schelling, a Nobel prize winner in economics. We find that the properties of the segregation model exist in numerous real-world scenarios, in which the co-located people may form groups and collaboratively share data messages using their wireless devices when they are moving towards the same Point of Interest. This grouping behavior of people (or their mobile devices) is called the ⁰́Schelling behavior⁰́₊ of people movement. We find that when mobile nodes exhibit Schelling behavior, the network formed by these nodes has two important properties: (1) co-located mobile nodes form ⁰́₋moving⁰́₊ coalitions, and (2) the coalition size increases at the closer distance from Point of Interest. We then conduct a validation study on these properties by: (1) simulating people movement on real Google maps, and (2) modeling people movement in different street configurations by using the Mobius modeling tool. Our validation study confirms the two properties of the Schelling behavior of people movement. Then, we exploit these properties to design three protocols to improve content distribution in mobile P2P networks, including COADA, iShare, and DENTA. We evaluate our protocols via simulation and the evaluation results show that our protocols outperform other existing content distribution schemes significantly by improving message delivery and reducing message overhead. For the second part of the thesis, we exploit the repetitive behavior of people movement for the design of content distribution protocols. Particularly, we propose a new methodology to collect people movement trace using mobile phones. We then apply this method to implement a trace collection system named UIM, which collects MAC addresses of Wifi access points and Bluetooth-enabled devices in the proximity of the experiment phones. The UIM system is deployed on Google Android phones carried by 123 faculties, staff, and students in University of Illinois campus from March 2010 to August 2010. The collected MAC addresses of Wifi access points are used to infer location information and the collected Bluetooth MACs are used to infer social contact. To the best of our knowledge, the UIM system is the first system to collect both location information and social contact of people movement. The inferred location information and social contact then are used in the characterization study, which shows that people movement exhibits a high degree of repetition. We then propose a novel method named Jyotish to construct a predictive model of people movement from the joint Wifi/Bluetooth trace to predict future information of location, stay duration at the location, and social contact. Applying the Jyotish method, we construct a predictive model from the joint Wifi/Bluetooth trace collected by the UIM scanning system. To the best of our knowledge, Jyotish is the first method to construct the predictive model of people movement from the joint Wifi/Bluetooth trace and our constructed predictive model is the first to provide altogether predictions for location, stay duration, and social contact. Finally, we leverage the constructed predictive model to design a new content distribution protocol named COMFA, which exploits the regularity of social contact found in the Bluetooth trace collected by the UIM system to maximize the message delivery probability and preserve message delivery deadline. We compare the performance of COMFA with Prophet routing and Epidemic routing over the collected Bluetooth trace and the evaluation results show that COMFA outperforms other alternatives by reducing the message delivery delay and message overhead considerably
Multimedia fundamentals by Ralf Steinmetz( Book )
1 edition published in 2002 in English and held by 2 libraries worldwide
An Activity-Based Framework for Automated Placement and Configuration of Multiple Stereo Cameras by Rahul Malik( file )
1 edition published in 2011 in English and held by 2 libraries worldwide
With the advent of virtual spaces, there has been a need to integrate physical worlds with virtual spaces. The integration can be achieved by real-time 3D imaging at several geographically distributed locations followed by fusion of information from multiple virtual and physical spaces. Systems that enable such information fusions are called tele-immersive and need to be easily deployed at many geographically distributed locations. One of the key requirements of these systems is to achieve high quality 3D and appearance information about physical spaces. Performance of several applications such as face recognition, activity classification, human tracking, etc. improves significantly from it. The quality of information depends on placement of stereo cameras and color constancy of scene appearance from multiple imaging devices. Thus, an important challenge in the deployment is the optimal placement of stereo cameras and color adjustments. Placement of stereo cameras directly impacts 3D reconstruction error and spatial resolution achieved (the quality of 3D information). In addition, color adjustments are needed to produce artifact-free and visually appealing rendered results (the quality of appearance information). The color adjustments include calibrating inter-camera color responses and matching measured colors to actual colors. This dissertation addresses two problems of improving the quality of 3D video obtained from stereo cameras. First, we consider the placement of multiple stereo cameras in order to minimize 3D reconstruction error and satisfy the resolution requirements specified by the user. In order for the user to specify the resolution requirements in space, we present a activity model framework for the user to concretely describe the minimum resolution required. Based on this resolution specification from the user for different activities, given by the activity model, this dissertation optimizes the placement of stereo cameras. Placement of stereo cameras differs significantly from the placement of 2D cameras in terms of objectives and applications. This dissertation finds the best placement for stereo cameras according to by minimizing the uncertainty in stereo depth estimation as well as satisfying different constraints by the user such as minimum resolution required, 360o placement, room geometry, etc. Using this, we show the improvements achieved according to our placement as opposed to other ad-hoc placement techniques, such as nearest, farthest and random. We also present the effects of different type as well as number of activity models upon the camera placement. The second problem which this thesis addresses is that of color constancy across multiple cameras. The problem of color constancy is important as consistent inter-camera color responses are needed to produce artifact-free and visually appealing rendered results. Also, the determined color should be similar to actual color. This is a complex problem as different cameras have different color responses, even with same hardware settings. We use Gretag MacBeth Color Checker chart to achieve similar response for different cameras. In this thesis, we present algorithms for determining the best hardware register value settings as well as additional software based transforms to achieve more fine-grained refinement. In addition to these, this thesis also presents three user studies to better understand the parameters that most impact the performance. In first study, we study the impact of communication media on remote collaboration. We compare 3D video tele-immersive, 2D video Skype and face-to-face for collaboration in a remote product development scenario. In second study, we seek to understand the importance of various tele-immersive system parameters for virtual-physical interaction. The task is that of moving a virtual ball to a basketball basket, and it requires localization, orientation and motion coordination for a human in tele-immersive environment to complete the task. Finally, in third study, we study the effect of cues and view presentation styles upon the ability to regain proprioceptive abilities. We consider wheelchair basketball players maneuvering the wheelchair as the activity and seek to compare the effectiveness of 3D tele-immersion over other cues and view-presentation styles
ACM multimedia and co-located workshops 2006 proceedings of the following included: MM'06, CARPE'06, HCM'06, MIR'06, AMCMM'06, VSSN'06, MCPS'06 : October 23-27, 2006 Santa Barbara, California by 2006, Santa Barbara, Calif.) International Conference on Multimedia (14( file )
2 editions published in 2006 in English and held by 2 libraries worldwide
Proceedings of the Second International Conference on Internet Multimedia Computing and Service by Yong Rui( file )
1 edition published in 2010 in English and held by 0 libraries worldwide
 
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Alternative Names
Klara Nahrstedt Professor of Computer Science
Languages
English (104)
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