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CONTENTS
ABOUT THIS ISSUE
Growing interest in cloud computing also raises the
question of cost/benefit. In this issue, we feature an
article describing a federated, open-source cloud platform
that lowers the entry barriers to systems and
applications research communities, an economic model
for determining whether to lease or buy storage, and an
analysis of energy consumption and battery life in
mobile devices offloading computation to the cloud. We
also look at puzzle-based learning, ethical codes of conduct
in the legal realm, and the linkage of software
development and business strategy.
COMPUTING PRACTICES
20 Puzzle-Based Learning for
Engineering and Computer
Science
Nickolas Falkner, Raja Sooriamurthi,
and Zbigniew Michalewicz
To attract, motivate, and retain students and
increase their mathematical awareness and
problem-solving skills, universities are
introducing courses or seminars that explore
puzzle-based learning. The authors introduce
and define this learning approach, describe
course variations, and highlight early student
feedback.
PERSPECTIVES
29 Using Codes of Conduct
to Resolve Legal Disputes
Peter Aiken, Robert M. Stanley, Juanita
Billings, and Luke Anderson
In the absence of other published standards of
care, it is reasonable for contractual parties to
rely on an applicable, widely available code of
conduct to guide expectations.
COVER FEATURES
35 Open Cirrus: A Global
Cloud Computing Testbed
Arutyun I. Avetisyan, Roy Campbell, Indranil
Gupta, Michael T. Heath, Steven Y. Ko,
Gregory R. Ganger, Michael A. Kozuch,
David O’Hallaron, Marcel Kunze, Thomas T.
Kwan, Kevin Lai, Martha Lyons, Dejan S.
Milojicic, Hing Yan Lee, Yeng Chai Soh,
http://computer.org/computer
For more information on computing topics, visit the Computer Society Digital Library at www.computer.org/csdl.
Ng Kwang Ming, Jing-Yuan Luke,
and Han Namgoong
Open Cirrus is a cloud computing testbed
that, unlike existing alternatives, federates
distributed data centers. It aims to spur
innovation in systems and applications
research and catalyze development of an
open source service stack for the cloud.
44 To Lease or Not to Lease
from Storage Clouds
Edward Walker, Walter Brisken,
and Jonathan Romney
Storage clouds are online services for leasing
disk storage. A new modeling tool,
formulated from empirical data spanning
many years, lets organizations rationally
evaluate the benefit of using storage clouds
versus purchasing hard disk drives.
51 Cloud Computing for Mobile
Users: Can Offloading
Computation Save Energy?
Karthik Kumar and Yung-Hsiang Lu
The cloud heralds a new era of computing
where application services are provided
through the Internet. Cloud computing can
enhance the computing capability of mobile
systems, but is it the ultimate solution for
extending such systems’ battery lifetimes?
RESEARCH FEATURE
57 Linking Software
Development and
Business Strategy
through Measurement
Victor R. Basili, Mikael Lindvall, Myrna
Regardie, Carolyn Seaman, Jens Heidrich,
Jürgen Münch, Dieter Rombach,
and Adam Trendowicz
The GQM + Strategies approach extends the
goal/question/metric paradigm for
measuring the success or failure of goals and
strategies, adding enterprise-wide support
for determining action on the basis of
measurement results. An organization can
thus integrate its measurement program
across all levels.
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