Diversity and Multiplexing: A Fundamental Tradeoff in Multiple Antenna Channels
by Lizhong Zheng, David N. C. Tse - IEEE Trans. Inform. Theory , 2002
"... Multiple antennas can be used for increasing the amount of diversity or the number of degrees of freedom in wireless communication systems. In this paper, we propose the point of view that both types of gains can be simultaneously obtained for a given multiple antenna channel, but there is a fund ..."
Multiple antennas can be used for increasing the amount of diversity or the number of degrees of freedom in wireless communication systems. In this paper, we propose the point of view that both types of gains can be simultaneously obtained for a given multiple antenna channel, but there is a
Monitoring the future: National survey results on drug use
by Lloyd D. Johnston, Ph. D, Patrick M. O'malley, Ph. D, Jerald G. Bachman, Ph. D, John E. Schulenberg, Ph. D - I: Secondary school students (NIH Publication No. 05-5726). Bethesda, MD: National Institute on Drug Abuse , 2005
"... by ..."
This book presents a unified treatment of many different kinds of planning algorithms. The subject lies at the crossroads between robotics, control theory, artificial intelligence, algorithms, and computer graphics. The particular subjects covered include motion planning, discrete planning, planning under uncertainty, sensor-based planning, visibility, decision-theoretic planning, game theory, information spaces, reinforcement learning, nonlinear systems, trajectory planning, nonholonomic planning, and kinodynamic planning.
Impulses and Physiological States in Theoretical Models of Nerve Membrane
by Richard Fitzhugh - Biophysical Journal , 1961
"... ABSTRACT Van der Pol's equation for a relaxation oscillator is generalized by the addition of terms to produce a pair of non-linear differential equations with either a stable singular point or a limit cycle. The resulting "BVP model " has two variables of state, representing excitabi ..."
ABSTRACT Van der Pol's equation for a relaxation oscillator is generalized by the addition of terms to produce a pair of non-linear differential equations with either a stable singular point or a limit cycle. The resulting "BVP model " has two variables of state, representing excitability and refractoriness, and qualitatively resembles Bonhoeffer's theoretical model for the iron wire model of nerve. This BVP model serves as a simple representative of a class of excitable-oscillatory systems including the Hodgkin-Huxley (HH) model of the squid giant axon. The BVP phase plane can be divided into regions corresponding to the physio-logical states of nerve fiber (resting, active, refractory, enhanced, depressed, etc.) to form a "physiological state diagram, " with the help of which many physiological phenomena can be summarized. A properly chosen projection from the 4-dimensional HH phase space onto a plane produces a similar diagram which shows the underlying relationship between the two models. Impulse trains occur in the BVP and HH models for a range of constant applied currents which make the singular point representing the resting state unstable.
Augmenting Mobile 3G Using WiFi
by Aruna Balasubramanian, Ratul Mahajan, Arun Venkataramani , 2010
"... We investigate if WiFi access can be used to augment 3G capacity in mobile environments. We first conduct a detailed study of 3G and WiFi access from moving vehicles, in three different cities. We find that the average 3G and WiFi availability across the cities is 87 % and 11%, respectively. WiFi th ..."
We investigate if WiFi access can be used to augment 3G capacity in mobile environments. We first conduct a detailed study of 3G and WiFi access from moving vehicles, in three different cities. We find that the average 3G and WiFi availability across the cities is 87 % and 11%, respectively. WiFi
Email overload: exploring personal information management of email
by Steve Whittaker, Candace Sidner - CHI 96 CONFERENCE ON HUMAN FACTORS IN COMPUTING SYSTEMS , 1996
"... Email is one of the most successful computer applications yet devised. Our empirical data show however, that although email was origirally designed as a communications application, it is now used for additional functions, that it was not designed for, such as task management and personal archiving. ..."
Email is one of the most successful computer applications yet devised. Our empirical data show however, that although email was origirally designed as a communications application, it is now used for additional functions, that it was not designed for, such as task management and personal archiving
Cabernet: Vehicular Content Delivery Using WiFi
by Jakob Eriksson, Hari Balakrishnan, Samuel Madden
"... Cabernet is a system for delivering data to and from moving vehicles using open 802.11 (WiFi) access points encountered opportunistically during travel. Using open WiFi access from the road can be challenging. Network connectivity in Cabernet is both fleeting (access points are typically within rang ..."
Cabernet is a system for delivering data to and from moving vehicles using open 802.11 (WiFi) access points encountered opportunistically during travel. Using open WiFi access from the road can be challenging. Network connectivity in Cabernet is both fleeting (access points are typically within
Interactive WiFi Connectivity For Moving Vehicles
by Aruna Balasubramanian, Ratul Mahajan, Arun Venkataramani, Brian Neil, Levine John Zahorjan
"... We ask if the ubiquity of WiFi can be leveraged to provide cheap connectivity from moving vehicles for common applications such as Web browsing and VoIP. Driven by this question, we conduct a study of connection quality available to vehicular WiFi clients based on measurements from testbeds in two d ..."
different cities. We find that current WiFi handoff methods, in which clients communicate with one basestation at a time, lead to frequent disruptions in connectivity. We also find that clients can overcome many disruptions by communicating with multiple basestations simultaneously. These findings lead us