11/08
VOL. 51 NO. 11
Contributed Art icles
54 A Tribute to Jim Gray
We knew him as both scholar
and friend.
By Michael Stonebraker
and David J. De Witt
58 Jim Gray, Astronomer
How he helped develop
the SkyServer, delivering
computation directly to terabytes
of astronomical data.
By Alexander S. Szalay
photoGraph by Joel bartlett, nexus friend Grapher by ivan KoziK
about the cover: the portrait of
Jim Gray was done by illustrator
Jeffrey smith, a professor at the
art Center College of design,
pasadena, Ca. his work has
been recognized with awards
from the new york society
of illustrators, the society of
newspaper design, the society
of publications designers,
Communication arts, among
others. for more, see http://jeffreysmithillustrator.com/.
Review Articles
Virtual Extension
as with all magazines, page limitations often
prevent the publication of articles that might
otherwise be included in the print edition.
to ensure timely publication, aCm created
Communications’ virtual extension (ve).
ve articles undergo the same rigorous review
process as those in the print edition and are
accepted for publication on their merit. these
articles are now available to aCm members in
the digital library.
66 The Convergence of Social and
Technological Networks
Internet-based data on human
interaction connects scientific
inquiry like never before.
By Jon Kleinberg
Research Highlights
74 Technical Perspective
The Polaris Tableau System
By Jim Gray
75 Polaris: A System for Query,
Analysis, and Visualization of
Multidimensional Databases
By Chris Stolte, Diane Tang,
and Pat Hanrahan
85 Technical Perspective
Safeguarding Online Information
against Failures and Attacks
By Barbara Liskov
86 Zyzzyva: Speculative Byzantine
Fault Tolerance
By Ramakrishna Kotla, Allen Clement,
Edmund Wong, Lorenzo Alvisi, and
Mike Dahlin
SME Strategies: An Assessment
of High vs. Low Performers
Daesoo Kim, Terence T. Ow,
and MinJoon Jun
A European Perspective of VoIP
in Market Competition
Claudio Feijóo, José Luis Gómez-Barroso, and David Rojo-Alonso
Technology Acceptance and
ERP Documentation Usability
Judy E. Scott
Conceptual Modeling Windows
and Bounds for Space and Time
in Database Constraints
Faiz Currim and Sudha Ram
User-Centric Services Provisioning
in Wireless Environments
Quan Z. Sheng, Boualem Benatallah,
and Zakaria Maamar
Exploring the Dark Side of IS in
Achieving Organizational Agility
Dongback Seo and Ariel I. La Paz
Six Strategies for Electronic
Medical Records Systems
Srinivasan Venkatraman, Hillol Bala,
Viswanath Venkatesh, and Jack Bates
Technical Opinion
Motivational Affordances:
Reasons for ICT Design and Use
Ping Zhang
Association for Computing Machinery
Advancing Computing as a Science & Profession
