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Browsing MIT Open Access Articles by Title

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  • Iida, Fumiya; Tedrake, Russell Louis (Springer Netherlands, 2010-01)
    Toward our comprehensive understanding of legged locomotion in animals and machines, the compass gait model has been intensively studied for a systematic investigation of complex biped locomotion dynamics. While most of ...
  • Ballinger, Brad; Charlton, David; Demaine, Erik D.; Demaine, Martin L.; Iacono, John; Liu, Ching-Hao; Poon, Sheung-Hung (Springer Berlin / Heidelberg, 2009-07)
    Locked tree linkages have been known to exist in the plane since 1998, but it is still open whether they have a polynomial-time characterization. This paper examines the properties needed for planar trees to lock, with a ...
  • Wang, Liying; Zhang, Lihong; Liu, Zhangzhi; Zhao, Dehua; Liu, Xiaomeng; Zhang, Bo; Xie, Jianbo; Hong, Yuanyuan; Li, Pengfei; Chen, Sanfeng; Dixon, Ray; Li, Jilun (Public Library of Science, 2013-10)
    Most biological nitrogen fixation is catalyzed by molybdenum-dependent nitrogenase, an enzyme complex comprising two component proteins that contains three different metalloclusters. Diazotrophs contain a common core of ...
  • Forney, G. David, Jr. (Institute of Electrical and Electronics Engineers (IEEE), 2011-01)
    Given a discrete-time linear system C, a shortest basis for C is a set of linearly independent generators for C with the least possible lengths. A basis B is a shortest basis if and only if it has the predictable span ...
  • Wang, Qiqi; Moin, Parviz; Iaccarino, Gianluca (Society for Industrial and Applied Mathematics, 2009-06)
    Adjoint equations of differential equations have seen widespread applications in optimization, inverse problems, and uncertainty quantification. A major challenge in solving adjoint equations for time dependent systems has ...
  • Börgers, Christoph; LeBeau, Fiona E. N.; Boyden, Edward Stuart; Kopell, Nancy J.; Franzesi, Giovanni Talei (Public Library of Science, 2012-02)
    In networks of excitatory and inhibitory neurons with mutual synaptic coupling, specific drive to sub-ensembles of cells often leads to gamma-frequency (25–100 Hz) oscillations. When the number of driven cells is too small, ...
  • Minsley, Burke J.; Coles, Darrell A.; Vichabian, Yervant; Morgan, Frank Dale (Society of Exploration Geophysicists, 2008-03)
    Self-potential (SP) surveys often involve many interconnected lines of data along available roads or trails, with the ultimate goal of producing a unique map of electric potentials at each station relative to a single ...
  • Smith, Matthew William; Miller, David W. (SPIE, 2010-07)
    The trend in future space telescopes points toward increased primary mirror diameter, which improves resolution and sensitivity. However, given the constraints on mass and volume deliverable to orbit by current launch ...
  • Demaine, Erik D.; Hajiaghayi, Mohammad; Marx, Daniel (Springer Berlin / Heidelberg, 2009-09)
    We study an extensive class of movement minimization problems which arise from many practical scenarios but so far have little theoretical study. In general, these problems involve planning the coordinated motion of a ...
  • Demaine, Erik D.; Zadimoghaddam, Morteza (Springer, 2010)
    We study the problem of minimizing the diameter of a graph by adding k shortcut edges, for speeding up communication in an existing network design. We develop constant-factor approximation algorithms for different variations ...
  • Ciullo, Delia; Celik, Guner Dincer; Modiano, Eytan H. (Institute of Electrical and Electronics Engineers, 2010-05)
    Energy optimization is a significant component of Wireless Sensor Network (WSN) design. In this paper we consider transmission energy optimization in WSNs where messages are collected by a mobile receiver (collector). The ...
  • Huang, Shurui; Ramamoorthy, Aditya; Medard, Muriel (Institute of Electrical and Electronics Engineers (IEEE), 2010-07)
    Consider a large file that needs to be multicast over a network to a given set of terminals. Storing the file at a single server may result in server overload. Accordingly, there are distributed storage solutions that ...
  • Medard, Muriel; Huang, Shurui; Ramamoorthy, Aditya (Institute of Electrical and Electronics Engineers (IEEE), 2011-02)
    Content distribution over networks is often achieved by using mirror sites that hold copies of files or portions thereof to avoid congestion and delay issues arising from excessive demands to a single location. Accordingly, ...
  • Polyanskiy, Yury; Poor, H. Vincent; Verdu, Sergio (Institute of Electrical and Electronics Engineers, 2011-08)
    The minimum achievable energy per bit over memoryless Gaussian channels has been previously addressed in the limit when the number of information bits goes to infinity, in which case it is known that the availability of ...
  • Zafer, Murtaza; Modiano, Eytan H. (Institute of Electrical and Electronics Engineers / IEEE Control Systems Society, 2009-11)
    We consider optimal rate-control for energy-efficient transmission of data, over a time-varying channel, with packet-deadline constraints. Specifically, the problem scenario consists of a wireless transmitter with B units ...
  • Zhang, Xiangxiong; Shu, Chi-Wang (Springer-Verlag, 2011-12)
    The entropy solutions of the compressible Euler equations satisfy a minimum principle for the specific entropy (Tadmor in Appl Numer Math 2:211–219, 1986). First order schemes such as Godunov-type and Lax-Friedrichs schemes ...
  • Gutowski, Timothy G.; Liow, Yuh Han John; Sekulic, Dusan P. (Institute of Electrical and Electronics Engineers, 2010-07)
    The purpose of this paper is to address both the high values, and the large variation in reported values for the energy requirements for the production of carbon nanotubes. The paper includes an estimate of the standard ...
  • Garg, Jivtesh; Chen, Gang (American Physical Society, 2013-04)
    The thermal conductivity of silicon-germanium superlattices is computed from density-functional perturbation theory using relaxation times that include both anharmonic and interface roughness effects. A decrease in the ...
  • Tumova, Jana; Reyes Castro, Luis Ignacio; Karaman, Sertac; Frazzoli, Emilio; Rus, Daniela L. (Institute of Electrical and Electronics Engineers (IEEE), 2013-06)
    We consider the problem of automatic generation of control strategies for robotic vehicles given a set of high-level mission specifications, such as “Vehicle x must eventually visit a target region and then return to a ...
  • Grossman, Sharon Rachel; Shlyakhter, Ilya; Karlsson, Elinor K.; Tabrizi, Shervin; Andersen, Kristian; Rinn, John; Lander, Eric S.; Schaffner, Steve; Sabeti, Pardis C.; 1000 Genomes Project (BioMed Central Ltd., 2010-10)
    The human genome contains hundreds of regions in which the patterns of genetic variation indicate recent positive natural selection, yet for most of these the underlying gene and the advantageous mutation remain unknown. ...
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