1. IEE/CEEM Seminar: Kang G. Shin and Energy-Minimizing Idle Listening in WiFi-Equipped Mobile Devices

    01:02:27

    from Institute for Energy Efficiency / Added

    28 Plays / / 0 Comments

    Kang G. Shin Professor of Electrical Engineering & Computer Science University of Michigan, Ann Arbor Energy-Minimizing Idle Listening in WiFi-Equipped Mobile Devices January 9, 2014 | 4:00pm | ESB 2001 Faculty host: Heather Zheng Abstract WiFi interface is known to be a primary energy consumer in mobile devices, and idle listening (IL) is the dominant source of energy consumption in WiFi. Most existing protocols, such as the 802.11 power-saving mode (PSM), attempt to reduce the time spent in IL by sleep scheduling. However, through an extensive analysis of real-world traffic, we found more than 60% of energy is consumed in IL, even with PSM enabled. To remedy this problem, we propose two effective schemes. The first is E-MiLi (Energy-Minimizing idle Listening) that reduces the power consumption in IL, given that the time spent in IL has already been optimized by sleep scheduling. Observing that radio power consumption decreases proportionally to its clock-rate, E-MiLi adaptively downclocks the radio during IL, and reverts to full clock-rate when an incoming packet is detected or a packet has to be transmitted. The second solution is Gap Sense, a novel mechanism that can coordinate heterogeneous devices without modifying their PHY-layer modulation schemes or spectrum widths. It prepends legacy packets with a customized preamble, which piggybacks information to enhance inter-device coordination. The preamble leverages the quiet period between signal pulses to convey such information, and can be detected by neighboring nodes even when they have incompatible PHY layers. We have implemented and evaluated both E-MiLi and Gap Sense on a software radio platform, demonstrating their significance and utility. This is joint work with Xinyu Zhang. Biography Kang G. Shin is the Kevin & Nancy O'Connor Professor of Computer Science in the Department of Electrical Engineering and Computer Science, The University of Michigan, Ann Arbor. His current research focuses on QoS-sensitive computing and networking as well as on embedded real-time and cyber-physical systems. He has supervised the completion of 74 PhDs, and authored/coauthored more than 800 technical articles (more than 300 of these are in archival journals), a textbook and more than 20 patents or invention disclosures, and received numerous best paper awards, including the Best Paper Awards from the 2011 ACM International Conference on Mobile Computing and Networking (MobiCom’11), the 2011 IEEE International Conference on Autonomic Computing, the 2010 and 2000 USENIX Annual Technical Conferences, as well as the 2003 IEEE Communications Society William R. Bennett Prize Paper Award and the 1987 Outstanding IEEE Transactions of Automatic Control Paper Award. He has also received several institutional awards, including the Research Excellence Award in 1989, Outstanding Achievement Award in 1999, Distinguished Faculty Achievement Award in 2001, and Stephen Attwood Award in 2004 from The University of Michigan (the highest honor bestowed to Michigan Engineering faculty); a Distinguished Alumni Award of the College of Engineering, Seoul National University in 2002; 2003 IEEE RTC Technical Achievement Award; and 2006 Ho-Am Prize in Engineering (the highest honor bestowed to Korean-origin engineers). He is also a co-founder of several startups and has licensed some of his technologies to industry.

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    • IEE/CEEM Seminar: Vidvuds Ozolins and Sparse Physics and its Applications to Energy Materials

      01:01:43

      from Institute for Energy Efficiency / Added

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      Vidvuds Ozolins Professor, Department of Materials Science and Engineering, & Director, DOE EFRC Molecularly Engineered Energy Materials, University of California, Los Angeles Sparse Physics and its Applications to Energy Materials November 13, 2013 | 4:00pm | ESB 1001 Faculty host: Chris Van de Walle Abstract The conventional approach to building physics models is based on physical intuition gained in prior studies of similar systems. Unfortunately, intuition is often faulty. We show that a recently developed technique from information science, compressive sensing (CS), provides a simple, efficient, and systematically improvable way of constructing models in a numerically robust and conceptually simple way. CS is a new paradigm for model building in physics - its models are sparse and just as robust or better than those built by current state-of-the-art approaches. They can be constructed at a fraction of the computational cost and user effort. We will illustrate the general idea and highlight applications to alloys, protein folding energetics, thermoelectrics and anhamronic lattice dynamics. We will also introduce a general formalism for obtaining localized ("compressed") solutions to a class of problems in mathematical physics, which can be recast as variational optimization problems. This class includes the important cases of the Schrödinger’s equation in quantum mechanics and electromagnetic equations for light propagation in photonic crystals. These ideas can also be applied to develop a spatially localized basis that spans the eigenspace of a differential operator, for instance, the Laplace operator, generalizing the concept of plane waves to an orthogonal real-space basis with multi-resolution capabilities. Biography Vidvuds Ozolins is a Professor of Materials Science and Engineering at UCLA, and received a Ph.D. in Theoretical Physics from the Royal Institute of Technology in Stockholm, Sweden, in 1998. Before joining the UCLA Department of Materials Science and Engineering in 2002, he was a postdoctoral fellow at the National Renewable Energy Laboratory (NREL) and a Principle Member of Technical Staff at Sandia National Laboratories in Livermore, California. Prof. His research interests lie in the area of computational materials design and energy materials. He uses quantum mechanics based computation to study materials for energy storage, thermoelectrics, structural materials, advanced nuclear fuels, electronic and optical materials. He has published more than 100 refereed scientific papers and holds several patents in energy materials. He is currently a Director of Molecularly Engineered Energy Materials (MEEM), an EFRC of the DOE Office of Science, Basic Energy Sciences.

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      • Gregor Henze IEE/CEEM Seminar - October 24, 2012 at UC Santa Barbara

        01:01:35

        from Institute for Energy Efficiency / Added

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        Gregor Henze Professor, Department of Civil, Environmental, and Architectural Engineering University of Colorado, Boulder Sustainable Buildings Research: Opportunities in Design and Operation Abstract Gregor Henze has been involved in building sciences research for 20 years, both in the United States and Europe. This seminar will offer a discussion of case studies of sustainable energy research applied to commercial buildings and an outlook on the need for future advances. The first part of the seminar will discuss low-exergy building systems for new building design. The rising interest in heating and cooling concepts based on renewable energy sources fosters the development and utilization of low-exergy systems applying natural low-temperature heat sources in the winter and high-temperature heat sinks in the summer (e.g., ambient air, ground water, soil). By using low temperature differences, those system solutions allow for an easier implementation of renewable energy sources into the built environment, as well as promoting a low-exergy demand for space heating and cooling. The second part of the seminar will cover a range of opportunities for applying advanced controls in commercial buildings, including associated challenges. In particular, model based predictive control applied both in real time or offline along with experimental and simulation results will be discussed. An area of current interest is the transition from numerically challenging model predictive control to simpler near-optimal heuristics by means of rule extraction.

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        • IEE/CEEM 2012-2013 Seminar Series - Roberto Myers

          01:01:14

          from Institute for Energy Efficiency / Added

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          Roberto Myers Professor, Materials Science and Engineering and Electrical and Computer Engineering Ohio State University Using Asymmetric Crystals for New Functionality: Moving Spins with Heat Using Spin-Orbit Coupling and Dopant-less Diodes Using Polarization Charge Abstract The lack of inversion symmetry in certain crystals leads to interesting properties. Two such properties, the spin-orbit effect and polarization charge, can be exploited for new thermoelectric and optoelectronic devices. In the first part of the talk, I will introduce the heat/spin conversion phenomenon, the spin-Seebeck effect. Phonons interact with the magnetic moments in a material driving them away from equilibrium inducing a diffusive spin current, which can be converted in a neighboring material into an electric voltage. Via the spin-orbit effect, the heat/spin interactions can occur even in non-magnetic, but spin-polarized materials. For example in InSb, the spin-Seebeck effect exhibits a magnitude of up to 8 mV/K, which is as large as the highest known charge based thermoelectric effect opening new possibilities for thermal energy conversion devices based on spin. In the second part of the talk, the anisotropic property of polarization charge in (Ga,Al)N compounds is introduced. If the composition of (Ga,Al)N is graded along the dipole direction, a slab of bound polarization charge is uniformly distributed in the crystal, which is compensated by free charges. By grading the composition in a back and forth manner within a nanowire (GaNàAlNàGaN) a polarization-induced pn-junction is formed. Unlike other pn-diodes, the polarization-induced diodes can be formed without intentional impurity doping, do not freeze out at low temperature, yet still exhibit rectification and ultraviolet light emission at the bandgap. This work was done in collaboration with C. M. Jaworski, J. P. Heremans, S. Carnevale, T. F. Kent, J. Yang, P. J. Phillips, and M. J. Mills.

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          • Dick Hebdige - "High and Dry: On Deserts and 'Crisis'"

            59:50

            from Environmental Humanities Center / Added

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            Talk at UCSB presented by the Interdisciplinary Humanities Center and the Environmental Humanities Center.

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            • Gary Shteyngart

              58:35

              from IHC UCSB / Added

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              UC Santa Barbara is pleased to welcome Gary Shteyngart as the inaugural Diana and Simon Raab Writer-in-Residence. He will read selections from latest book, Little Failure: A Memoir, which was published in January 2014. Shteyngart was born in Leningrad in 1972 and came to the United States seven years later. He is the author of the novels Super Sad True Love Story, which won the Bollinger Everyman Wodehouse Prize and was selected as one of the best books of the year by more than forty news journals and magazines around the world; Absurdistan, which was chosen as one of the ten best books of the year by The New York Times Book Review and Time magazine; and The Russian Debutante’s Handbook, winner of the Stephen Crane Award for First Fiction and the National Jewish Book Award for Fiction. His work has appeared in The New Yorker, Travel + Leisure, Esquire, GQ, The New York Times Magazine, and many other publications and has been translated into twenty-six languages. Courtesy of Chaucer’s Books, copies of Shteyngart’s books will be available for purchase and signing. Sponsored by the Diana and Simon Raab Writer-in-Residence Program, created to bring distinguished practitioners of the craft of writing to the UCSB community. Co-presented by the Interdisciplinary Humanities Center, the Writing Program, and UCSB Arts and Lectures.

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              • IEE/CEEM Seminar: Millie Dresselhaus and Personal Perspectives on Advancing Energy Sustainability

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                from Institute for Energy Efficiency / Added

                35 Plays / / 0 Comments

                Millie Dresselhaus Professor of Electrical Engineering and Physics Massachusetts Institute of Technology Professor Dresselhaus has been selected as the 2013 UC Santa Barbara Dow Distinguished Lecturer Personal Perspectives on Advancing Energy Sustainability November 20, 2013 | 4:00pm | ESB 1001 Faculty host: John Bowers and Dow Distinguished Lecturer series Abstract Although my career has focused on advancing science and engineering in its more basic aspects, I have had several opportunities to also advance energy sustainability, which is a central goal of Energy Frontier Centers. In my talk I will give some examples of how this has happened in my case and ideas for how my personal experience can be generalized by others. Biography Professor Mildred Dresselhaus is a native of the Bronx, New York City, where she attended the New York City public schools through junior high school, completing her high school education at Hunter College High School in New York City. She began her higher education at Hunter College in New York City and received a Fulbright Fellowship to attend the Cavendish Laboratory, Cambridge University (1951-52). Professor Dresselhaus received her master's degree at Radcliffe College (1953) and her Ph.D. at the University of Chicago (1958). Professor Dresselhaus began her MIT career at the Lincoln Laboratory. During that time she switched from research on superconductivity to magneto-optics, and carried out a series of experiments which led to a fundamental understanding of the electronic structure of semi-metals, especially graphite. A leader in promoting opportunities for women in science and engineering, Professor Dresselhaus received a Carnegie Foundation grant in 1973 to encourage women's study in traditionally male dominated fields, such as physics. In 1973, she was appointed to The Abby Rockefeller Mauzé chair, an Institute-wide chair, endowed in support of the scholarship of women in science and engineering.

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                • Sound + Science - James Marston - Navigation and Spatial Learning for the Blind

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                  from Art|Sci Center / Added

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                  James Marston of UC Santa Barbara's Department of Geography presents "Using Audio Cues to Enhance Navigation and Spatial Learning for the Blind" as part of the Sound + Science Symposium at UCLA, March 6th, 2009.

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                  • Colloquium Talk on Advanced Use of Moodle LMS

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                    from Justin Lipp / Added

                    20 Plays / / 0 Comments

                    This talk was given for the UCSB Department of Communication Spring Colloquium Series on April 20, 2012. Topics included technical and pedagogical issues of incorporating the Moodle LMS into a traditional classroom environment. Discussion also focused on empirical data of student and faculty LMS satisfaction studies and the practical implications for everyday use.

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                    • Exxon Valdez to Gulf Disaster: Changing the End Game

                      55:34

                      from Coastal Fund / Added

                      28 Plays / / 0 Comments

                      A lecture by Dr. Riki Ott, marine toxicologist and author of NOT ONE DROP, at the University of California, Santa Barbara on Oct. 12, 2010 in the Bren School of Environmental Science and Management. Co-sponsored by the Coastal Fund and Environmental Studies Program. Dr. Ott shares her experiences with communities of the Gulf Coast following the BP Deepwater Horizon oil spill. She discusses the human and environmental health impacts from the brew of oil and chemical dispersants that now foul the region using the lessons from the Exxon Valdez and the suffering it caused Alaskan communities for years after the 1989 spill.

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