aspuru-list April 2007

aspuru-list@lists.fas.harvard.edu

13 participants
58 discussions

[Aspuru-Guzik group list] [iic-seminars] [Colloquium] REMINDER: Computational Neuroscience Lecture: Eero Simoncelli

by colloquium＠deas.harvard.edu

my.harvard calendar reminder: Event Information: Date : 4/25/2007 Start Time : 04:00 PM End Time : 05:00 PM Title : Computational Neuroscience Lecture: Eero Simoncelli Description : Eero Simoncelli Center for Neural Science, and Courant Institute for Mathematical Sciences, New York University Wednesday April 25, 4pm Maxwell Dworkin G115 Characterizing neural encoding with simple spiking models A fundamental goal of sensory systems neuroscience is the characterization of the functional relationship between environmental stimuli and neural response. In seeking computational models that can be used for this purpose, there is a natural tradeoff between biological realism and computational simplicity/tractability. I'll describe a family solutions we've been investigating that inherit much of the simplicity and computational advantage of linear systems, and yet are capable of faithfully reproducing many of the complexities of spiking neural responses. I'll discuss application of these methods to visual neurons in retina and cortex. Location : Maxwell Dworkin G115 URL : Phone : Calendar : Computer Science Colloquium Series _______________________________________________ Colloquium mailing list Colloquium(a)deas.harvard.edu https://lists.deas.harvard.edu/mailman/listinfo/colloquium _______________________________________________ iic-seminars mailing list iic-seminars(a)calists.harvard.edu http://calists.harvard.edu/mailman/listinfo/iic-seminars

17 years

[Aspuru-Guzik group list] [iic-seminars] [Colloquium] Two Computational Neuroscience Lectures: Eero Simoncelli - April 25 and Peter Dayan - April 30

by colloquium＠deas.harvard.edu

Eero Simoncelli Center for Neural Science, and Courant Institute for Mathematical Sciences, New York University Wednesday April 25, 4pm Maxwell Dworkin G115 Characterizing neural encoding with simple spiking models A fundamental goal of sensory systems neuroscience is the characterization of the functional relationship between environmental stimuli and neural response. In seeking computational models that can be used for this purpose, there is a natural tradeoff between biological realism and computational simplicity/tractability. I'll describe a family solutions we've been investigating that inherit much of the simplicity and computational advantage of linear systems, and yet are capable of faithfully reproducing many of the complexities of spiking neural responses. I'll discuss application of these methods to visual neurons in retina and cortex. _______________________________________________________________________________________ Peter Dayan Gatsby Computational Neuroscience Unit, University College, London. Monday April 30, 4pm Maxwell Dworkin G125 Norepinephrine and Neural Interrupts The neuromodulator norepinephrine plays an important role in aspects of vigilance and attention. Extensive neurophysiological recordings show that noradrenergic neurons are activated on a phasic, sub-second time-scale by behaviorally relevant stimuli and contingencies within tasks. We model this activity as a neural interrupt signal that reports on unexpected changes of state within a task, and show that this offers a faithful characterization of a range of the neurophysiological data. We also discuss its relationship to existing theories suggesting norepinephrine reporting on uncertainty between tasks on a much longer time-scale of minutes and beyond. These theoretical characterizations are complementary and jointly offer a rich picture of a key neural signal. _______________________________________________ Colloquium mailing list Colloquium(a)deas.harvard.edu https://lists.deas.harvard.edu/mailman/listinfo/colloquium _______________________________________________ iic-seminars mailing list iic-seminars(a)calists.harvard.edu http://calists.harvard.edu/mailman/listinfo/iic-seminars

17 years

[Aspuru-Guzik group list] Reminder: Tilman Biodiversity, Ecology and Global Change Lecutre TODAY

by Jenny MacGregor

Please join us for the inaugural event in the Biodiversity, Ecology and Global Change Lecture Series /with/ Professor *G. David Tilman*, Regents' Professor and McKnight Presidential Chair in Ecology in the Department of Ecology, Evolution and Behavior at the University of Minnesota, and Director of the Cedar Creek Natural History Area. The Causes and Consequences of Biodiversity: Theory and Experimental Tests *Today- April 23 at 5 PM* in Sherman Fairchild Room 102, 7 Divinity Avenue. * The lecture is free and open to the public. Future lectures in this series will be announced later this year. Jenny MacGregor Events and Publications Coordinator Harvard University Center for the Environment ph: 617-495-8883

17 years

[Aspuru-Guzik group list] [Fwd: bapc-events@cosmos.phy.tufts.edu]

by Alan Aspuru-Guzik

This seminar might be of interest under my absence. I think it is the recent Lukin Paper. Alan -- Alán Aspuru-Guzik Assistant Professor Department of Chemistry and Chemical Biology 12 Oxford Street Harvard University Cambridge, MA 02138 Tel: (617)384-8188 Group URL: http://aspuru.chem.harvard.edu

17 years

[Aspuru-Guzik group list] [iic-seminars] IIC Seminar Reminder - Srinidhi Varadarajan on April 25.

by Helene Tingle

Initiative in Innovative Computing @ Harvard Seminar Series Wednesday, April 25, 2007; 4:00pm 60 Oxford Street, Room 330 Srinidhi Varadarajan, Director, Center for High-End Computing Systems, Associate Professor of Computer Science Virginia Polytechnic Institute and State University Seminar Title: Relativistic Time: A Unified Temporal Model for Mixed- Mode Simulations Abstract As computer networks continue to grow dramatically, there is a critical need for scalable network simulation testbeds that can capture the complexity of large-scale systems. To this end, we developed the Open Network Emulator, a scalable testbed that supports both discrete-event simulation as well as direct-code execution based emulation of Internet-scale networks. The scale and fidelity of this simulation environment present a fundamental challenge. As the complexity of a simulation system starts approaching reality, there is no unified measure of time. Network applications in a real system run in real-time or wall-clock time, which flows naturally, but is uncontrolled. Models of next generation network devices operate in highly controllable virtual time, but the virtual clock has to be forced by events occurring in the system. To solve this problem, we developed a system of time called relativistic time, which reconciles real time and virtual time by creating a model of time that flows naturally, and yet is highly controllable. In this talk, I will present the characteristics of the simulation environment, the challenges in integrating temporal models and results from our work on the relativistic time model. Upcoming IIC seminars Continue to stay up to date with our IIC Seminar Schedule. Parking is available in the 52 Oxford Street Garage. Please tell the attendant that you are attending the IIC Seminar. _______________________________________________ iic-seminars mailing list iic-seminars(a)calists.harvard.edu http://calists.harvard.edu/mailman/listinfo/iic-seminars

17 years

[Aspuru-Guzik group list] Another one!

by Alan Aspuru-Guzik

Dear group, Another one, to add to the collection: http://pubs.acs.org/cen/news/85/i16/8516notw6.html -- Alán Aspuru-Guzik Assistant Professor Department of Chemistry and Chemical Biology 12 Oxford Street Harvard University Cambridge, MA 02138 Tel: (617)384-8188 Group URL: http://aspuru.chem.harvard.edu

17 years

[Aspuru-Guzik group list] Backup volunteer needed.

by Alan Aspuru-Guzik

Dear group students, (CC Jerry Lotto, FYI and also requesting feedback in case the plan can be improved upon) I need a volunteer to become the Backupmeister http://www.smallnetbuilder.com/content/view/29671/75/ The backupmeiser's responsibility would be to maintain and configure the device linked above (or an equivalent one) and make sure it is up and running. We would backup to it using FTP, and it would have 2 hard-disks mirrored in case one dies out. I am thinking of using two 250-350 GB (sweet-spot price/storage) disks and calling it llhasa.chem.harvard.edu (it is like Tibet, far to reach, but with all our holy information) and putting it in the darkest corner of the department: the basement or a place that is not the physical location of our other computers. I can go to Microcenter and purchase the beast and the hard drives. What I need from you is a student that is willing to: 0) Research online what is the sweet spot in terms of storage/dollars considering the price of the unit itself (200 + 2 hard drives that will be mirrored), also if there is a better device than this one. 1) Assemble and install the 2 Hard-drives 2) Ask Jerry lotto for an IP/address, permission to install in the computer room in the basement 3) Create FTP accounts for everybody and figure out how to use Simple backup: https://help.ubuntu.com/community/BackupYourSystem/SimpleBackupSuite 4) Make sure the cluster /n/app/* directories are backed up there regularly, as well as the main aspuru.chem machine. If no volunteer replies, I will assign you by means of a random number generator >:-D (Evil grin) Alan -- Alán Aspuru-Guzik Assistant Professor Department of Chemistry and Chemical Biology 12 Oxford Street Harvard University Cambridge, MA 02138 Tel: (617)384-8188 Group URL: http://aspuru.chem.harvard.edu

17 years

[Aspuru-Guzik group list] [Fwd: Re: Feedback from aspuru@chemistry.harvard.edu]

by Alan Aspuru-Guzik

Dear Group: The academic reader is getting better. -- Alán Aspuru-Guzik Assistant Professor Department of Chemistry and Chemical Biology 12 Oxford Street Harvard University Cambridge, MA 02138 Tel: (617)384-8188 Group URL: http://aspuru.chem.harvard.edu

17 years

[Aspuru-Guzik group list] Biodiversity, Ecology and Global Change Lecutre

by Jenny MacGregor

Dear Harvard University Center for the Environment Friends, This spring the Center for the Environment is launching a new lecture series that will bring distinguished speakers to campus to lecture on topics relating to a central aspect of environmental science: ecology. The "Biodiversity, Ecology and Global Change" lecture series, organized by Jonathan Losos, Monique and Philip Lehner Professor for the Study of Latin America and Curator in Herpetology, aims to support the ecology program at Harvard and strengthen the interactions among the ecological/environmental community on campus. For the inaugural event in this series, we are pleased to have Professor *G. David Tilman*, Regents' Professor and McKnight Presidential Chair in Ecology in the Department of Ecology, Evolution and Behavior at the University of Minnesota, and Director of the Cedar Creek Natural History Area. Professor Tilman's research explores how managed and natural ecosystems can sustainably meet the joint human needs for food and energy. His research focuses on the effects of biological diversity on ecosystem services of value to society, especially climate stabilization through carbon sequestration. He is an elected member of the American Academy of Arts and Sciences and the National Academy of Sciences, is Chair of Environmental Sciences and Ecology for the National Academy of Sciences, was the Founding Editor of the journal Ecological Issues and has served on editorial boards of nine scholarly journals, including Science. Professor Tilman's public lecture, "The Causes and Consequences of Biodiversity: Theory and Experimental Tests", will be on *Monday, April 23 at 5 PM* in Sherman Fairchild Room 102, 7 Divinity Avenue. The lecture is free and open to the public. Future lectures in this series will be announced later this year. I have attached a poster with the details for Professor Tilman's talk. Please contact me if you have any questions about this event. Kindest Regards, Jenny MacGregor Events and Publications Coordinator Harvard University Center for the Environment ph: 617-495-8883

17 years

[Aspuru-Guzik group list] Talk at 3.00 PM: Anthony Dutoi, Northwestern University.

by Alan Aspuru-Guzik

Dear all, We are having a special group meeting today at 3.00 PM to listen to Dr. Tony Dutoi from Tamar Seideman's group at Northwestern University. His title is: "Computational study of the orientation dependence of high-harmonic generation" 3.00-4.00 PM Room M114 You are all invited to attend, Cheers, Alan -- Alán Aspuru-Guzik Assistant Professor Department of Chemistry and Chemical Biology 12 Oxford Street Harvard University Cambridge, MA 02138 Tel: (617)384-8188 Group URL: http://aspuru.chem.harvard.edu

17 years

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aspuru-list April 2007