When an ant colony needs to find a new nest, scouts are sent out to evaluate the suitability of potential sites, particularly their size. It has been suggested that ant scouts of Leptothorax albipennis use a simple he...
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(纸本)3540200576
When an ant colony needs to find a new nest, scouts are sent out to evaluate the suitability of potential sites, particularly their size. It has been suggested that ant scouts of Leptothorax albipennis use a simple heuristic known as Buffon's needle to evaluate nest size. They do this in two stages: first laying a pheromone trail in the nest site, then, after a return to the old nest, coming back and wandering within the site assessing frequency of intersection with the pheromone trail ("two-pass" strategy). If a colony is forced to relocate from its current nest due to destruction of that nest, the time required to find a suitable new nest may be crucial. This paper details preliminary results from a computer simulation model of evaluation of nest size. The model aims to study why a "two-pass" strategy is used by ants when a "one-pass" strategy, in which the ant simultaneously lays pheromone and assesses the frequency at which it encounters its own trail, may be more time efficient. Analysis of the results indicates no clear advantage for the "two-pass" strategy, given the assumptions of the model. Possible implications of this result are discussed.
Land consolidation is a strategic instrument for rural planning and thus economic development in the Spanish region of Galicia. This paper describes an experimental system embedded in a GIS environment to aid rural en...
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Land consolidation is a strategic instrument for rural planning and thus economic development in the Spanish region of Galicia. This paper describes an experimental system embedded in a GIS environment to aid rural engineers to develop land consolidation plans. The system supports all the stages of the plan and many functionalities are implemented as heuristic processes based on expert knowledge and advice. The overall aim is to overcome administrative and technical problems of traditional consolidation procedures. The system provides an integrated framework for the management of spatial and administrative consolidation information. It also includes optimization-based algorithms for the automated generation of multiple alternative parcel reallocations, as well as an environment to refine and objectively evaluate the proposed solutions. These key capabilities result in a powerful tool for decision making that dramatically reduces the time and cost of land consolidation plans. Pilot experiences in two consolidation zones of Galicia assess the feasibility and effectiveness of the system. [ABSTRACT FROM AUTHOR]
Due to the nonholonomic constraint and restricted mobility, the design of stabilizing control laws for a mobile is a challenging problem. Sliding mode control is a robust design methodology based on a sliding surface ...
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Due to the nonholonomic constraint and restricted mobility, the design of stabilizing control laws for a mobile is a challenging problem. Sliding mode control is a robust design methodology based on a sliding surface and a Lyapunov's stability theorem, where the system uncertainties and external disturbances can be handled under the invariance characteristics of system's sliding condition with guaranteed system stability. In this paper, a genetic algorithm is used to optimize the parameters in sliding mode controller for a nonholonomic mobile robot. The effectiveness of the proposed GA based sliding model controller is demonstrated by simulation studies.
We report the first experimental observation of discrete vector solitons in AlGaAs nonlinear waveguide arrays. These self-trapped states are possible through the coexistence of two orthogonally polarized fields and ar...
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We report the first experimental observation of discrete vector solitons in AlGaAs nonlinear waveguide arrays. These self-trapped states are possible through the coexistence of two orthogonally polarized fields and are stable in spite of the presence of four-wave mixing effects. We demonstrate that at sufficiently high power levels the two polarizations lock into a highly localized vector discrete soliton that would have been otherwise impossible in the absence of either one of these two components.
It reveals some equivalences between automata based on complete residuated lattice-valued logic (called (?) valued automata) and the truth-value lattice of the underlying logic (i.e. residuated lattice). In particular...
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It reveals some equivalences between automata based on complete residuated lattice-valued logic (called (?) valued automata) and the truth-value lattice of the underlying logic (i.e. residuated lattice). In particular, it demonstrates several basic equivalent characterizations on the retriev-ability of (?) valued automata. Finally, the connections of the homomorphisms between two eeeeeeeeee valued automata to continuous mappings and open mappings are clarified. So this paper establishes further the more profound fuzzy automata theory.
The input/output relationship of a Sample/Hold and Analogue-to-Digital Conversion device (S/H-ADC) can be described as the response of a non-linear system with memory. A general-purpose "black-box" behaviour...
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In the paper performance evaluation of a differential post detection integration (DPDI) technique for code acquisition in the Return Link of a Satellite CDMA system is carried out in the presence of Rician fading and ...
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In the paper, the preamble structure of IMT-2000 SW-CDMA air radio interface is considered in the evaluation of the performance of different post detection integration techniques for code acquisition in the return lin...
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W-CDMA and SW-CDMA air interfaces require that a user equipment in a given cell acquires slot and flame synchronization, and identifies the primary scrambling code used by the target cell before starting communication...
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Let L be a set of line segments in three dimensional Euclidean space. In this paper, we prove several characterizations of tetrahedralizations. We present an O(nmlog n) algorithm to determine whether L is the edge set...
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