3,791,347 research outputs found
Potential estimates and quasilinear parabolic equations with measure data
In this paper, we study the existence and regularity of the quasilinear
parabolic equations: in
, and a bounded domain
. Here , the nonlinearity
fulfills standard growth conditions and term is a continuous function
and is a radon measure. Our first task is to establish the existence
results with , for . We next obtain global
weighted-Lorentz, Lorentz-Morrey and Capacitary estimates on gradient of
solutions with , under minimal conditions on the boundary of domain
and on nonlinearity . Finally, due to these estimates, we solve the
existence problems with for .Comment: 120
Super-Linear Convergence of Dual Augmented-Lagrangian Algorithm for Sparsity Regularized Estimation
We analyze the convergence behaviour of a recently proposed algorithm for
regularized estimation called Dual Augmented Lagrangian (DAL). Our analysis is
based on a new interpretation of DAL as a proximal minimization algorithm. We
theoretically show under some conditions that DAL converges super-linearly in a
non-asymptotic and global sense. Due to a special modelling of sparse
estimation problems in the context of machine learning, the assumptions we make
are milder and more natural than those made in conventional analysis of
augmented Lagrangian algorithms. In addition, the new interpretation enables us
to generalize DAL to wide varieties of sparse estimation problems. We
experimentally confirm our analysis in a large scale -regularized
logistic regression problem and extensively compare the efficiency of DAL
algorithm to previously proposed algorithms on both synthetic and benchmark
datasets.Comment: 51 pages, 9 figure
q-Chebyshev polynomials
In this overview paper a direct approach to q-Chebyshev polynomials and their
elementary properties is given. Special emphasis is placed on analogies with
the classical case. There are also some connections with q-tangent and
q-Genocchi numbers.Comment: enlarged version, 34 page
Interference Alignment for the Multi-Antenna Compound Wiretap Channel
We study a wiretap channel model where the sender has transmit antennas
and there are two groups consisting of and receivers respectively.
Each receiver has a single antenna. We consider two scenarios. First we
consider the compound wiretap model -- group 1 constitutes the set of
legitimate receivers, all interested in a common message, whereas group 2 is
the set of eavesdroppers. We establish new lower and upper bounds on the secure
degrees of freedom. Our lower bound is based on the recently proposed
\emph{real interference alignment} scheme. The upper bound provides the first
known example which illustrates that the \emph{pairwise upper bound} used in
earlier works is not tight.
The second scenario we study is the compound private broadcast channel. Each
group is interested in a message that must be protected from the other group.
Upper and lower bounds on the degrees of freedom are developed by extending the
results on the compound wiretap channel.Comment: Minor edits. Submitted to IEEE Trans. Inf. Theor
Color Ferromagnetism of Quark Matter ; a Possible Origin of Strong Magnetic Field in Magnetars
We show a possibility that strong ``magnetic field'' G is
produced by color ferromagnetic quark matter in neutron stars. In the quark
matter a color magnetic field is generated spontaneously owing to Savvidy
mechanism and a gluon condensate arises for the stabilization of the field.
Since the quark matter is electrically charged in the neutron stars, the
rotation of the quarks around the color magnetic field produces the strong
``magnetic field''.Comment: 7 page
Community building and virtual teamwork in an online learning environment
In the world of OTIS, an online Internet School for occupational therapists, students from four European countries were encouraged to work collaboratively through problem based learning by interacting with each other in a virtual semi-immersive environment. This paper aims to explore the issues that there was little interaction between students from different tutorial groups and virtual teamwork developed in each of the cross cultural tutorial groups. Synchronous data from European students was captured during tutorial sessions and peer booked meetings and evidence suggests that communities of interest were established. It is possible to conclude that collaborative systems can be designed, which encourage students to build trust and teamwork in a cross cultural online learning environment. </p
Cyclic Low-Density MDS Array Codes
We construct two infinite families of low density MDS array codes which are also cyclic. One of these families includes the first such sub-family with redundancy parameter r > 2. The two constructions have different algebraic formulations, though they both have the same indirect structure. First MDS codes that are not cyclic are constructed and then by applying a certain mapping to their parity check matrices, non-equivalent cyclic codes with the same distance and density properties are obtained. Using the same proof techniques, a third infinite family of quasi-cyclic codes can be constructed
TRECVID: benchmarking the effectiveness of information retrieval tasks on digital video
Many research groups worldwide are now investigating techniques which can support information retrieval on archives of digital video and as groups move on to implement these techniques they inevitably try to evaluate the performance of their techniques in practical situations. The difficulty with doing this is that there is no test collection or any environment in which the effectiveness of video IR or video IR sub-tasks, can be evaluated and compared. The annual series of TREC exercises has, for over a decade, been benchmarking the effectiveness of systems in carrying out various information retrieval tasks on text and audio and has contributed to a huge improvement in many of these. Two years ago, a track was introduced which covers shot boundary detection, feature extraction and searching through archives of digital video. In this paper we present a summary of the activities in the TREC Video track in 2002 where 17 teams from across the world took part
Occupied Palestinian Territories
A half-century of conflict has contributed to the current unstable situation of the Occupied Palestinian Territories, split between the Hamas-controlled Gaza Strip and the Fatah-controlled West Bank. Both explosive ordnance and unexploded ordnance remain from the civil struggle between Hamas and Fatah political factions, as well as the Israeli-Palestinian conflict. Earlier this year, Israeli forces imposed dominion over the Gaza Strip, plunging the region into a humanitarian crisis. On 23 January 2008, a series of Hamas-detonated landmine explosions along the border wall in Rafah, Gaza Strip, opened passage for tens of thousands of Palestinians to escape into Egypt. No signs of resolution are yet in sight for these regions impeded by continual violence and escalating poverty
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