102,623 research outputs found
Legal Requirements for Admission to Public Schools
Advanced driver assistance systems for heavy duty vehicles, such as lookahead cruise and gearshift controllers, rely on high quality map data. Current digital maps do not offer the required level of road grade information. This contribution presents an algorithm for on-board road grade estimation based on fusion of GPS and vehicle sensor data with measurements from previous runs over the same road segment. An incremental update scheme is utilized to ensure that data storage requirements are independent of the number of measurement runs. Results of the implemented system based on six traversals of a known road with three different vehicles are presented.QC 20120216</p
Model reduction of networked passive systems through clustering
In this paper, a model reduction procedure for a network of interconnected
identical passive subsystems is presented. Here, rather than performing model
reduction on the subsystems, adjacent subsystems are clustered, leading to a
reduced-order networked system that allows for a convenient physical
interpretation. The identification of the subsystems to be clustered is
performed through controllability and observability analysis of an associated
edge system and it is shown that the property of synchronization (i.e., the
convergence of trajectories of the subsystems to each other) is preserved
during reduction. The results are illustrated by means of an example.Comment: 7 pages, 2 figures; minor changes in the final version, as accepted
for publication at the 13th European Control Conference, Strasbourg, Franc
Construction of totally reflexive modules from an exact pair of zero divisors
Let A be a local ring which admits an exact pair x,y of zero divisors as
defined by Henriques and Sega. Assuming that this pair is regular and that
there exists a regular element on the A-module A/(x,y), we explicitly construct
an infinite family of non-isomorphic indecomposable totally reflexive
A-modules. In this setting, our construction provides an answer to a question
raised by Christensen, Piepmeyer, Striuli, and Takahashi. Furthermore, we
compute the module of homomorphisms between any two given modules from the
infinite family mentioned above.Comment: 15 page
Tube domains and restrictions of minimal representations
In this paper we study the restrictions of the minimal representation in the
analytic continuation of the scalar holomorphic discrete series from
to , and from SU(n,n) to
respectively. We work with the realisations of the
representation spaces as -spaces on the boundary orbits of rank one of the
corresponding cones, and give explicit integral operators that play the role of
the intertwining operators for the decomposition. We prove inversion formulas
for dense subspaces and use them to prove the Plancherel theorem for the
respective decomposition. The Plancherel measure turns out to be absolutely
continuous with respect to the Lebesgue measure in both cases
Traffic measurement and analysis
Measurement and analysis of real traffic is important to gain knowledge
about the characteristics of the traffic. Without measurement, it is
impossible to build realistic traffic models. It is recent that data
traffic was found to have self-similar properties. In this thesis work
traffic captured on the network at SICS and on the Supernet, is shown to
have this fractal-like behaviour. The traffic is also examined with
respect to which protocols and packet sizes are present and in what
proportions. In the SICS trace most packets are small, TCP is shown to be
the predominant transport protocol and NNTP the most common application.
In contrast to this, large UDP packets sent between not well-known ports
dominates the Supernet traffic. Finally, characteristics of the client
side of the WWW traffic are examined more closely. In order to extract
useful information from the packet trace, web browsers use of TCP and HTTP
is investigated including new features in HTTP/1.1 such as persistent
connections and pipelining. Empirical probability distributions are
derived describing session lengths, time between user clicks and the
amount of data transferred due to a single user click. These probability
distributions make up a simple model of WWW-sessions
A Closed-Form Solution to the Arbitrary Order Cauchy Problem with Propagators
The general abstract arbitrary order (N) Cauchy problem was solved in a
closed form as a sum of exponential propagator functions. The infinite sparse
exponential series was solved with the aid of a homogeneous differential
equation. It generated a linear combination of exponential functions. The
Cauchy problem solution was formed with N linear combinations of N exponential
propagators.Comment: 6 page
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