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SUNMONTUEWEDTHUFRISAT
Events for February 27, 2008
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Meet USC
Wed, Feb 27, 2008
Viterbi School of Engineering Undergraduate Admission
Workshops & Infosessions
This half day program is designed for prospective freshmen and family members. Meet USC includes an information session on the University and the Admission process; a student led walking tour of campus and a meeting with us in the Viterbi School. Meet USC is designed to answer all of your questions about USC, the application process and financial aid.Reservations are required for Meet USC. This program occurs twice, once at 9:00 a.m. and again at 1:00 p.m. Please visit http://www.usc.edu/admission/undergraduate/visit/events/meet_usc/ to check availability and make an appointment. Be sure to list an Engineering major as your "intended major" on the webform!
Location: USC Admission Center
Audiences: Prospective Freshmen and Family Members - RESERVATIONS REQUIRED
Contact: Viterbi Admission
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A Co-rotational Kinematic Framework for Large Deformation Analysis
Wed, Feb 27, 2008 @ 02:00 PM - 03:00 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Arif Masud, Department of Civil and Environmental Engineering, The University of Illinois at Urbana-ChampaignThis talk presents a hierarchical approach to the modeling of multi-layered composites with arbitrary ply lay-up sequences and orientations. The approach is applicable to flat as well as curved geometric configurations. The model is based on a co-rotational procedure that is derived consistently from the updated Lagrangian framework. The underlying variational formulation is based on an assumed strain method. Displacements and rotations are assumed finite while the strains are infinitesimal. The close relationship between the co-rotational procedure and its underlying updated Lagrangian framework is presented to highlight the cost reduction for large and complicated geometric configurations. Some simple but mathematically consistent procedures for updating element stresses and calculating the internal force vector are also discussed.
An elastoplastic damage model is incorporated in this co-rotational framework to accommodate material degradation in each individual laminate. The model is based on irreversible thermodynamics with the damage surface defined in terms of an internal damage variable of energy, along with a set of rate-independent elastoplastic constitutive equations that are defined in an effective stressâ€"strain space. Employing the operator splitting methodology, a three-step predictor/multi-corrector algorithm is developed that includes an elastic predictor, a plastic corrector, and a damage corrector.
Several representative numerical simulations of materially and geometrically nonlinear analysis are presented to show the accuracy and the range of applicability of the model. The model is then applied to the design of a co-axial laminated system.Vita: Professor Arif Masud received Ph.D. in Computational Mechanics from Stanford University in April 1993. He joined the University of Illinois at Urbana-Champaign in August 2006, after having served on the faculty of University of Illinois at Chicago from 1994-2006. Dr. Masud is working on the development of multi-scale finite element methods for application in nonlinear solid and fluid mechanics. He has delivered several Keynote Lectures at International Conferences, and organized more than ten International Symposia on Multiscale & Stabilized Finite Element Methods. He is co-editor of the book The Finite Element Method: 1970s and Beyond that appeared in 2004. In 1999 he was awarded the Teaching Recognition Award by the Council for Excellence in Teaching at UIC, and in 2002 he was awarded the Faculty Distinguished Research Award by the College of Engineering at UIC. Dr. Masud serves on the Editorial Boards of five International Journals. He is Chair of the Computational Mechanics Committee of ASCE, and Vice-Chair of the Fluid Mechanics Committee of ASME. Dr. Masud serves as an Associate Editor of the ASCE Journal of Engineering Mechanics, and an Associate Editor of the ASME Journal of Applied Mechanics. In 2006 he was elected Fellow of the International Association of Computational Mechanics (IACM).
Location: Kaprielian Hall (KAP) - 209
Audiences: Everyone Is Invited
Contact: Evangeline Reyes
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Prospects for Very Large Space Telescopes: How Mass Scales with Structural Requirements
Wed, Feb 27, 2008 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Lee Peterson ProfessorGary L. Roubos Endowed ChairDepartment Chair (on sabbatical)Director, Center for Aerospace StructuresDepartment of Aerospace Engineering SciencesUniversity of ColoradoBoulder, CO A conceptual design framework is presented for studying how the mass of a large space telescope mirror will depend on design disturbances, mirror diameter, and practical structural design constraints. A variety of on-orbit, launch, and ground test design requirements are considered, as are practical constraints on structural truss member properties. While prior work emphasized the trade between structural depth and overall mass fraction, this paper shows how these practical constraints limit the achievable structural depth, and thus define an optimal depth. An example of a tetrahedral support truss for a segmented mirror is presented. For lightly loaded design cases, it is observed that the minimum mass structure is determined by the simultaneous application of minimum allowable tube thickness, a specified strut Euler buckling load, and a specified strut pin-pin frequency. Closed form solutions are derived for the optimal structural depth and areal density. These are shown to be independent of the diameter of the telescope mirror.
Location: Seaver Science LIbrary, Rm 150
Audiences: Everyone Is Invited
Contact: April Mundy
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CS Colloq: Modeling Human Behavior for Defense against Flash-Crowd Attacks
Wed, Feb 27, 2008 @ 03:30 PM - 05:00 PM
Thomas Lord Department of Computer Science
Conferences, Lectures, & Seminars
Title: Modeling Human Behavior for Defense against Flash-Crowd AttacksSpeaker: Dr. Jelena Mirkovic (ISI)ABSTRACT:
Flash-crowd attacks are the most vicious form of distributed denial
of service (DDoS). They flood the victim with service requests
generated from numerous bots. Attack requests are identical in
content to those generated by legitimate, human users, and bots send
at a low rate to appear non-aggressive --- these features defeat many
existing DDoS defenses. We propose defenses against flash-crowd
attacks via human behavior modeling, which differentiate bots from
human users. Current approaches to human-vs-bot differentiation, such
as graphical puzzles, are insufficient and annoying to users, whereas
our defenses are highly effective and transparent to humans. We have
developed three types of human behavior models: a) request dynamics
models learn several features of human interaction dynamics, and
detect bots that exhibit higher aggressiveness in one or more of
these features, b) request sequence models learn visit and
transitional probabilities of user requests; they detect bots that
generate valid but low-probability sequences, and c) deception
techniques embed human-invisible objects into server replies, and
flag users that visit them as bots. Our techniques raise the bar for
a successful attack to a botnet size that is accessible to less than
5%, and sometimes less than 1%, of attackers today.BIO:
Dr. Jelena Mirkovic is a computer scientist at USC/ISI, which she
joined in 2007. Previously she was an assistant professor at the
University of Delaware, 2003-2007.
She received her M.S. and Ph.D. from UCLA, and her B.S. in Computer
Science and Engineering from the School of Electrical Engineering,
University of Belgrade, Serbia. Her current research is focused on:
methodologies for security experimentation, computer worms and viruses,
denial-of-service attacks, and IP spoofing.Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: CS Colloquia
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Medtronic Information Session
Wed, Feb 27, 2008 @ 05:30 PM - 07:00 PM
Viterbi School of Engineering Career Connections
Workshops & Infosessions
Join representatives of this company as they share general company information and available opportunities.
Location: Grace Ford Salvatori (GFS) 106
Audiences: All Viterbi Students
Contact: RTH 218 Viterbi Career Services
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ISA - Deloitte Case Study
Wed, Feb 27, 2008 @ 06:00 PM - 07:30 PM
Daniel J. Epstein Department of Industrial and Systems Engineering
University Calendar
The USC Information Systems Association (ISA) will be hosting Deloitte Consulting at its next meeting!WHAT: Deloitte Case StudyWHEN: Wednesday, February 27, 2008TIME: 6:00 PMWHERE: MHP 106Deloitte will only be seeking juniors graduating between December 2008 - May 2009 for their summer internship. Students do not need to be members of ISA to attend. This meeting is FREE and open to all majors.It's not too late to become a member! Come to this week's meeting for more information or visit the ISA website at www.uscisa.net.If you have any questions please feel free to contact Alex Kim at alexjkim@usc.edu.
Location: Seeley Wintersmith Mudd Memorial Hall (of Philosophy) (MHP) - 106
Audiences: Everyone Is Invited
Contact: Georgia Lum
