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In different kinds of surface-based chemical and biological micro/nanosensors, interpretation of the experimentally obtained data is performed based on approximate solutions for the sensor response, valid for the case of single-analyte samples. A question arises whether or not the approximate models used for experimental data fitting in the case of a single analyte are also applicable for multianalyte...
There is a growing interest to understand the fundamental principles of how epidemic, ideas or information spread over large networks (e.g., the Internet or online social networks). Conventional approach is to use SIS models (or its derivatives). However, these models usually are over-simplified and may not be applicable in realistic situations. In this paper, we propose a generalization of the SIS...
We study a system of multiple routers traversed by multiple TCP connections using TCP New Reno, CUBIC and Compound. More than one router may be congested. To analyze this system we will use earlier theoretical models of TCP New Reno and CUBIC but develop a new model of TCP Compound experiencing random packet losses and queuing delays. We model the router queues as M/GI/1 queues with arrival rates...
Modern computer systems consist of a large number of dynamic hardware and software components that interact according to some specific rules. Quantitative models of such systems are important for performance engineering because they allow for an earlier prediction of the quality of service. The application of stochastic modelling for this purpose is limited by the problem of the explosion of the state...
The Spring-Loaded Inverted Pendulum (SLIP), or monopedal runner, is widely used to depict running and hopping in mammalian and human locomotion, which is also serving as a template for running robot design. This classic model describes quite a simple mechanical system. Nevertheless issue of seeking the accurate analytic solution revealing the characteristics of the motion during stance remains unsettled...
In this paper we present a new approach to calculate the tunneling and thermionic current in Schottky barrier Double-Gate MOSFETs (SB-DG-MOSFETs). This prediction is based on a physics-based two-dimensional analysis. Analytical approximations for the spatial tunneling current density and carrier distributions in the channel are introduced. From this explicit analytical model equations for the tunneling...
The problem of stabilizing steady gliding is very critical for an underwater glider, which is subject to many non-negligible disturbances from the aquatic environment. Traditional control methods like PID control, LQR control or torque control, can not provide simultaneously easy controller implementation and fast convergence speed for stabilization. In paper we propose a new nonlinear, passivity-based...
In this paper, we describe a variational segmentation method to segment an image in two regions based on the piecewise constant case of the Fuzzy Region Competition method. The proposed model introduces a local weighting into the refered model to improve the detection of objects composed by large intensity variations or some kind of texture. Furthermore, the proposed model is computationally efficient...
The analytical modeling of dark saturation current of a solar cell conventionally incorporates either SRH (Schokley-Reed-Hall) recombination or Auger recombination, since simultaneous consideration of both these mechanisms results in mathematical complexity. On the other hand, non-uniform doping profile is used in the practical solar cells for which a retarding electric field is introduced and as...
An analytical method for solving nonlinear differential equation that describes the Bouc-Wen model of dynamic hysteresis is proposed. Solution is sought in the form of successive approximations based on the Fourier transforms. The results confirm the efficiency of this method.
Non-volatile memories, such as Flash and Phase-Change Memory, are replacing other memory and storage technologies. Although these new technologies have desirable energy and scalability properties, they are prone to wear-out due to excessive write operations. Because wear-out is an important phenomenon, a number of endurance management schemes have been proposed. There is a trade-off between what techniques...
This paper highlights the energy errors made for the design of supercapacitors used as a main energy source. First of all, the paper presents the two definitions of capacitance of a capacitance-voltage dependent material. The number of supercapacitors is important for the application purchasing cost. That is why the paper introduces an analytical model and an electrical model along with an identification...
This paper presents a new method to obtain the transient time features of second order bang-bang phase locked loops (BBPLLs) in response to phase step input such as rise time, peak time, over shoot and settling time. This method introduces the closed-form equations with acceptable accuracy by Approximating transient response to reasonable specific waveform. This approach gives new insights into the...
This paper is concerned with characterizing the transient behavior of general queueing systems, which is widely known to be notoriously difficult. The objective is to develop a statistical methodology, integrated with extensive offline simulation and preliminary queueing analysis, for the estimation of a small number of transfer function models (TFMs) that quantify the input-output dynamics of a general...
The paper deals with a procedure for approximate symbolic analysis of linear circuits in the frequency domain, which is based on a combination of simple parametric approach and topology transformations. The large-change sensitivities are computed using the cofactor matrix which can be obtained by a simple matrix inversion. An effective cofactor-updating strategy based on the use of the Sherman-Morrison...
This paper provides a stochastic approach to the analysis of real-time systems under preemptive priority-driven scheduling. The main idea is to simplify the execution time distributions via random sampling to decrease complexity. This beneficial effect is counterbalanced by an increase in pessimism. However, the proposed analysis is significantly less pessimistic than the classical worst-case deterministic...
We describe an analytical study of the characteristics of a double-chamber series valveless micropump using a one-dimensional non-linear model. We derive a closed-form expression for relationship between the mean volume flux, pressure difference and measurable characteristics of the pump. To first order, the results show the linear decrease of the volume flux with the pressure difference, which is...
This paper deals with the analytical solution of the time domain integro-differential Pocklington equation for a straight, finite length, thin wire, embedded in a homogeneous lossy medium. The analytical solution is obtained approximating the integral part of the Pocklington equation and handling the differential operator by the aid of Laplace transform. The resulting space-time dependent equation...
In this paper, we propose an extension to the formal verification approach of hybrid systems to verify the tunnel diode oscillator (TDO) with temperature variations. This enables the same platform that is used for validating the hybrid system, to be also used to formally verify the tunnel diode oscillator with temperature variations. The proposed approach utilizes the simulation traces from the actual...
The IMP distortion occurring with the amplification of OFDM signals through a nonlinear RF power amplifier (PA) is analysed with a view to establishing internal relations and impairment significance of different types and combinations - composition categories- of IMPS. Through this, a novel estimation method was deduced to calculate power spectral densities (PSD) of nonlinear distortion. This method...
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