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Most works in dexterous manipulation consider Force Closure Grasp (FCG), not only for rigid object but also, for flexible ones, though in the second case a force readjustment is also necessary. However, there are situations in which FCG is nonviable. This paper deals with the situation of a flexible object that must be necessarily grasped from one of its sides, taking advantage of its flexibility...
Magnetically coupled circuits can be formulated in the language of dynamic systems for both time variant and time invariant inductances. An ideal system, proposed here, with zero resistance and zero self-inductance for each circuit can be used to guide the design of a computing device that finds the minima of an energy function.
From the results of the research project entitled MiProDOC, where the PMBOK® Guide project management good practices were adapted to the organization and delivery of teaching in the European Higher Education Area (EHEA), in this paper a personal environment for teaching management is presented. This environment integrates a set of tools supporting the teaching life cycle and is formed by both transversal...
A fundamental issue in Elastic Optical Networks (EONs) relies on choosing a proper route and necessary number of contiguous frequency slots from end-to-end to accommodate the traffic demands. Spectrum assignment based on the traditional First-Fit assignment has been extensively employed in EON investigations due to its inherent simplicity and favorable capacity of leaving end-to-end free slots in...
In this paper we develop a novel approach to model error modelling. There are natural links to others recently developed ideas. However, here we make several key departures, namely (i) we focus on relative errors; (ii) we use a broad class of model error description which includes, inter alia, the earlier idea of stochastic embedding; (iii) we estimate both, the nominal model and undermodelling simultaneously...
This paper reports results from the ongoing research on MOM devices as nonlinear analog blocks in circuits and systems. Here the describing function of a MOM device V-I characteristic is calculated step by step, and also the stability of MLC circuits when the memristor is time varying is discussed.
Queuing research and its applications have been studied extensively by concentrating mainly on design, performance and running of the service facility under study. In this paper we show how a simple behavioral queuing system can be modeled using a Cellular Automata; and then we show how a Genetic Algorithm can be used to optimize the behavioral properties of this agent based model.
This paper considers the contributions of one outstanding as well as controversial researcher, teacher and inventor from Spain during the Francos's dictatorship. The paper presents an overview of the most important contributions made by Prof. Angel Gonzalez del Valle related with the electric networks/circuits theory and its application to analog computing/simulation, which was achieved from forties...
Recently a fourth circuit element, predicted four decades ago, has been discovered by HP researchers. This device, known as the memristor, is basically a resistance with memory that can be used as a tunable gain in control systems. In this paper the memristor experimental characteristic is modeled with a describing function and used to predict oscillations in closed loop systems with linear plants.
Large gear reducers for vertical roller mills have a lead time of over 2 years. The same can be expected of their spare parts. A catastrophic failure of a gear reducer can be detrimental to a company's production and financial security. This paper discusses the measures taken to bring a vertical roller mill, whose gear reducer was subject to a catastrophic failure, back to 100% production in less...
This paper assesses the PAPR for multimode transmitters (WiMAX, WiFi and Bluetooth), considering different combinations of modulations and access techniques (spreading codes and OFDM). Simulations include preamble, header and data fields. Results give hints for tailoring the back-off of power amplifiers, as well as for foreseeing the necessary slew-rate in polar transmitters.
Gene networks are a particular class of complex networks found in living organisms. In these networks, there are some statistically significant connection patterns called motifs. The goal of this paper is to study mainly four motifs FFL, SIM, MO-FFL, BIFAN, present in the E. Coli gene network from the control theory perspective.
After three decades of research, an electronic device that belongs to the class of nonlinear systems known as memristive systems has been found. In this paper an I/O linearization approach to memristive systems is proposed and illustrated with the actual memristor equations.
A computational and experimental investigation was carried out in an electromagnetically stirred molten aluminum. The molten metal was contained in a cylindrical vessel made of stainless steel. The vessel was positioned in front of a linear induction machine. The free-surface deformation was calculated using numerical simulation with ANSYS and FLUENT and was compared to experimental observations made...
MPLS offers a efficient transport scheme and traffic engineering capabilities for real-time VoIP. However, at the transport plane, the bandwidth reserved for voice traffic is a key parameter necessary to ensure performance guarantees for VoIP communications. This paper addresses this important piece of traffic engineering: determining the bandwidth requirements for voice traffic aggregated. To achieve...
DNA chips are proposed as the platform to store and evaluate rules for knowledge based systems. The principle is illustrated with two rule bases, Boolean and fuzzy.
DNA chips are currently used for gene expression studies of cells and tissues under different conditions. The same principle can be applied in control engineering to supervise industrial plants, determine operating conditions, detect or classify faults using thousands of sampled analog or binary variables.
Summary form only given. Cr:forsterite is a vibronic laser source tunable in the near-infrared spectral region in the range 1.15-1.35 /spl mu/m. In this paper, we report for the first time, to our knowledge, on the operation of a regenerative amplifier system based upon Cr:forsterite. Self-mode-locked Cr:forsterite lasers have generated pulses as short as 25 fs, theoretically the large bandwidth of...
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