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## Stability and Hopf bifurcation of a predator–prey model with stage structure and time delay for the prey

### Nonlinear Dynamics (2016-02-01) 83: 1409-1418 , February 01, 2016

A predator–prey system with stage structure and time delay for the prey is investigated. By analyzing the corresponding characteristic equations, the local stability of a positive equilibrium and two boundary equilibria of the system is discussed, respectively. By using persistence theory on infinite dimensional systems and comparison argument, respectively, sufficient conditions are obtained for the global stability of the positive equilibrium and one of the boundary equilibria of the proposed system. Further, the existence of a Hopf bifurcation at the positive equilibrium is studied. Numerical simulations are carried out to illustrate the main results.

## A superconvergent isogeometric formulation for eigenvalue computation of three dimensional wave equation

### Computational Mechanics (2016-06-01) 57: 1037-1060 , June 01, 2016

A superconvergent isogeometric formulation is presented to compute the eigenvalues for three dimensional wave equation. This three dimensional superconvergent isogeometric formulation is characterized by a higher order mass matrix formulation with particular reference to the quadratic basis functions. The three dimensional higher order mass matrix is built upon an optimal combination of the reduced bandwidth mass matrix and the consistent mass matrix. The frequency error associated with the isogeometric discretization of three dimensional wave equation is derived in detail. In particular, the optimal mass combination parameter for higher order mass matrix is devised as a function of the two spatial wave propagation angles, which enables that arbitrary frequency corresponding to a given wave propagation direction can be computed in a superconvergent way. Two extra orders of accuracy, i.e., 6th order of accuracy, are attained by the proposed higher order mass matrix than the consistent mass matrix for the frequency computation of three dimensional wave equation. The dispersion property of the present three dimensional higher order mass matrix formulation is examined as well. The accuracy of the proposed three dimensional superconvergent isogeometric formulation is testified by several numerical examples.

## Microcontroller-Implemented Artificial Neural Network for Electrooculography-Based Wearable Drowsiness Detection System

### Advanced Computer and Communication Engineering Technology (2016-01-01) 362: 461-472 , January 01, 2016

Various methods have been explored to develop an effective drowsiness detection system to give drivers a warning of impending drowsiness. The present work has successfully developed an electrooculagraphy-based wearable drowsiness detection system in the form of a visor cap by implementing an artificial neural network (ANN) into an Arduino LilyPadUSB microcontroller. As a result, a stand-alone and wearable system that does not require a computer was achieved. The performance of the system for drowsiness detection has an overall accuracy of 90.00 %, precision of 88.00 %, sensitivity of 91.67 % and a training mean squared error (MSE) of 2.70 × 10^{−3}.

## Otto Cycle or What Is Behind the Simplified Formula

### Thermal Engineering Studies with Excel, Mathcad and Internet (2016-01-01): 191-197 , January 01, 2016

This chapter explains how the usual simplified formula to calculate thermal efficiency of an internal combustion engine is appears. Described Internet sites with the “reverse” design challenge—you must not to enter raw data and get a response, but you must enter formulas for calculations and verify their correctness (educational task).

## Mathematical Model of the Time-Varying Wireless Channel

### Digital Signal Processing for Wireless Communication using Matlab (2016-01-01): 1-50 , January 01, 2016

In this chapter the mathematical model for four fundamental parameters of the time-varying channel namely Doppler shift Doppler shift, coherence time, Coherence time Doppler spread Doppler spread and coherence frequency is Coherence frequency discussed. Case studies on discrete time-varying channel model (flat fading Rayleigh and Rician models, single tap with estimated filter coefficient model) are also illustrated using MATLAB. Also spatial multiplexing using decoupling of MIMO is demonstrated in this chapter.

## Active Matrix Driving

### Handbook of Visual Display Technology (2016-01-01): 1-16 , January 01, 2016

Multimedia systems require electronic displays with high resolution and video performance. The solution in terms of display technologies such as LCDs and OLEDs is active matrix (AM) driving. This chapter describes the signal path from digital panel input to row and column signals in terms of ICs (integrated circuits); the so-called panel electronics system.

## Erratum to: “On one method for constructing a family of approximations of zeta constants by rational fractions”

### Problems of Information Transmission (2016-01-01) 52: 100-101 , January 01, 2016

## Gate design and filling process analysis of the cavity in injection molding process

### Advances in Manufacturing (2016-06-01) 4: 123-133 , June 01, 2016

This paper presents a new geometry of an edge gate in the injection molding process called modified edge gate. The corners of current edge gate result in the turbulence of molten plastic into the cavity which leads to internal and external defects. The aim of the new geometry is to reduce the internal and external defects of injected part such as sink marks and short shot. The easier de-gating analysis for the new geometry to decrease the visible blemish of the injected part was proposed in this study. A modified edge gate was proposed for two circular flat plates with thickness 1 mm. Finite element method (FEM) was used along with SolidWorks plastic. Internal and external defects of the injected part were analyzed via SolidWorks plastic. To validate the new geometry, an experimental study was implemented for two polypropylene (PP) circular flat plates with modified edge gate to confirm the simulation results. The contribution of this research is to modify the geometry of current edge gate by removing the corners of rectangular edge gate which leads to the reduction of scrap. The new geometry presents easier de-gating of gate and less visible blemish of the injected part. A smooth flow of molten plastic into the cavities reduces the internal and external defects. The outcome of this study demonstrates filling of the cavities with no short shot. In addition, no sink marks were detected with modified edge gate. Finally, the modified edge gate has less visible blemish on the injected part in comparison with current edge gate.

## Correction Method for Spine Flexion Tracking with Markers

### New Trends in Medical and Service Robots (2016-01-01) 39: 265-275 , January 01, 2016

The aim of the present paper is to accomplish a virtual model for testing the properties of the outer layers of the human body (skin, adipose tissue, muscle) in order to estimate and calculate the displacements of certain points on the skin surface in relation to the bones (which are considered fixed points). The proposed correction method will be used in the development of a device for tracking the human body postures and the spine movement by using different types of sensors for establishing a preliminary diagnosis of it. There is a major problem identified in this case of tracking the spine with markers: the skin sliding in connection with the bones. In order to obtain a precise calculus, it requires great knowledge of this phenomenon and the ability to establish a clear relationship between the position of bones and the position of the corresponding points on the skin, taking into account the different characteristics of material and measurement conditions.

## Printed and Planar Antennas

### Millimeter-Wave Antennas: Configurations and Applications (2016-01-01): 39-60 , January 01, 2016

Many applications of RF systems impose severe space constraints on the design of the antenna. Military aircraft, satellites, guided missiles, and mobile broadband systems (to name but a few) need low-profile antennas that effortlessly integrate into a mechanical structure.