17,122 research outputs found
Membrane Fission: A Computational Complexity Perspective
Membrane fission is a process by which a biological membrane is split into two new ones in the manner
that the content of the initial membrane is separated and distributed between the new membranes. Inspired by this
biological phenomenon, membrane separation rules were considered in membrane computing. In this work, we
investigate cell-like P systems with symport/antiport rules and membrane separation rules from a computational
complexity perspective. Specifically, we establish a limit on the efficiency of such P systems which use communication
rules of length at most two, and we prove the computational efficiency of this kind of models when using
communication rules of length at most three. Hence, a sharp borderline between tractability and NPâhardness
is provided in terms of the length of communication rules.Ministerio de EconomĂa y Competitividad TIN2012-3743
Motion-Based Design of Passive Damping Devices to Mitigate Wind-Induced Vibrations in Stay Cables
Wind action can induce large amplitude vibrations in the stay cables of bridges. To reduce
the vibration level of these structural elements, different types of passive damping devices are
usually installed. In this paper, a motion-based design method is proposed and implemented in
order to achieve the optimum design of different passive damping devices for stay cables under
wind action. According to this method, the design problem is transformed into an optimization
problem. Thus, its main aim is to minimize the different terms of a multi-objective function,
considering as design variables the characteristic parameters of each considered passive damping
device. The multi-objective function is defined in terms of the scaled characteristic parameters,
one single-function for each parameter, and an additional function that checks the compliance of
the considered design criterion. Genetic algorithms are considered as a global optimization method.
Three passive damping devices have been studied herein: viscous, elastomeric and friction dampers.
As a benchmark structure, the Alamillo bridge (Seville, Spain), is considered in order to validate
the performance of the proposed method. Finally, the parameters of the damping devices designed
according to this proposal are successfully compared with the results provided by a conventional
design method
Symplectic Regularization of Binary Collisions in the Circular N+2 Sitnikov Problem
We present a brief overview of the regularizing transformations of the Kepler
problem and we relate the Euler transformation with the symplectic structure of
the phase space of the N-body problem. We show that any particular solution of
the N-body problem where two bodies have rectilinear dynamics can be
regularized by a linear symplectic transformation and the inclusion of the
Euler transformation into the group of symplectic local diffeomorphisms over
the phase space. As an application we regularize a particular configuration of
the circular N+2 Sitnikov problem.Comment: 23 pages, 5 figures. References to algorithmic regularization
included, changes in References and small typographic corrections. Accepted
in J. of Phys. A: Math. Theor 44 (2011) 265204
http://stacks.iop.org/1751-8121/44/26520
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