bluuebunny/crossref_metadata_2025_split huggingface dataset:
A hybrid controller for PWM active rectifiers based LCL filters
Authors: Marzouki Amira , Hamouda Mahmoud , Fnaiech Farhat 
Published: July 2015

Purpose
– The purpose of this paper is to propose a new hybrid control method of pulse width modulation (PWM) active rectifiers tied to the grid through an LCL filter. The control method is designed with the aim to achieve a perfect regulation of the dc-bus voltage; a near unity input power factor (UIPF) operation as well as a high quality of the line currents.

Design/methodology/approach
– The proposed hybrid control method consists of a PI-based linear controller cascaded with a nonlinear one. The nonlinear controller (inner loop) is designed using the input-output feedback linearization (IOFL) theory. It should control both the dc-bus voltage and the input currents at the converter’s poles. The linear controller (outer loop) is devoted to control the reactive line current so as to achieve a near UIPF.

Findings
– A perfect regulation of the dc-bus voltage and a near UIPF operation are achieved. Moreover, a high quality of the line currents is obtained. The robustness and effectiveness of the proposed control method have been successfully tested under variation of the dc voltage reference as well as grid and load disturbances.

Practical implications
– The proposed method is useful for single-stage and two-stage grid connected photovoltaic systems, wind energy conversion, and distributed power generation systems.

Originality/value
– The main novelty of this paper is the combination of linear and nonlinear controllers with the aim to control a PWM active rectifier tied to the grid through a third-order LCL filter. In the opinion, such control method has not been applied to this converter in earlier research papers. The numerical simulations carried out under normal and abnormal conditions confirm the effectiveness of the proposed approach.
A Chebyshev collocation method for Hallén’s equation of thin wire antennas
Authors: Wang Yinkun , Luo Jianshu , Chen Xiangling , Sun Lei 
Published: July 2015

Purpose– The purpose of this paper is to propose a Chebyshev collocation method (CCM) for Hallén’s equation of thin wire antennas.Design/methodology/approach– Since the current induced on the thin wire antennas behaves like the square root of the distance from the end, a smoothed current is used to annihilate this end effect. Then the CCM adopts Chebyshev polynomials to approximate the smoothed current from which the actual current can be quickly recovered. To handle the difficulty of the kernel singularity and to realize fast computation, a decomposition is adopted by separating the singularity from the exact kernel. The integrals including the singularity in the linear system can be given in an explicit formula while the others can be evaluated efficiently by the fast cosine transform or the fast Fourier transform.Findings– The CCM convergence rate is fast and this method is more efficient than the other existing methods. Specially, it can attain less than 1 percent relative errors by using 32 basis functions whena/his bigger than 2×10−5 wherehis the half length of wire antenna andais the radius of antenna. Besides, a new efficient scheme to evaluate the exact kernel has been proposed by comparing with most of the literature methods.Originality/value– Since the kernel evaluation is vital to the solution of Hallén’s and Pocklington’s equations, the proposed scheme to evaluate the exact kernel may be helpful in improving the efficiency of existing methods in the study of wire antennas. Due to the good convergence and efficiency, the CCM may be a competitive method in the analysis of radiation properties of thin wire antennas. Several numerical experiments are presented to validate the proposed method.
Improved coil design for repetitive magnetic stimulation of the spinal cord
Authors: Cretu Mihaela , Micu Dan Doru 
Published: July 2015

Purpose
– The purpose of this paper is to evaluate the response of the spinal cord, the transmembrane potential, during lumbar magnetic stimulation, using a figure of eight coil.

Design/methodology/approach
– In order to obtain a precise stimulation of the spinal cord and not the nearby nervous fibres, the coil from the electric circuit of the magnetic stimulator is optimized. The new proposed design is based on the turns’ placement inside the coil, the number of turns required to produce activation. Once the coil configuration is established, the paper addresses other issues that need to be solved: reducing power consumption (the low efficiency of power transfer from the coil to the tissue is a major drawback) and reducing coil heating.

Findings
– The traditional commercial coils, used for magnetic stimulation in some preliminary experiments, had proved their inability to specifically stimulate the target tissue, without activating the surrounding areas and the low efficiency of power transfer from the coil to the nervous tissue. A more realistic modelling of the stimulating coil, based on the distribution of turns inside the coil can lead to directly stimulation of the spinal cord, during lumbar magnetic stimulation.

Practical implications
– If the electrical circuit of the magnetic stimulator is improved, the direct stimulation of the spinal cord is obtained; so, this technique could facilitate functional motor activities, including standing and stepping in paralyzed people, without requiring implantation of electrodes like in electrical stimulation.

Originality/value
– The authors underlined that the spinal cord stimulation can be achieved by magnetic stimulation, only if the parameters of the stimulator circuit are optimized. Therefore an original and realistic modelling of the inductive coil was proposed based on number and turns’ distribution within the coil. The coil is designed so that reducing the excessive heating makes it difficult in obtaining a more frequent repetition of stimulus.
Design of a new nonlinear model predictive fault tolerant control system using multi-sensor data fusion technique based on UKF algorithm
Authors: Ghesmat Mohammad , Khalkhali Akbar 
Published: July 2015

Purpose– There are high expectations for reliability, safety and fault tolerance are high in chemical plants. Control systems are capable of potential faults in the plant processing systems. This paper proposes is a new Fault Tolerant Control (FTC) system to identify the probable fault occurrences in the plant.Design/methodology/approach– A Fault Diagnosis and Isolation (FDI) module has been devised based on the estimated state of system. An Unscented Kalman Filter (UKF) is the main innovation of the FDI module to identify the faults. A Multi-Sensor Data Fusion algorithm is utilized to integrate the UKF output data to enhance fault identification. The UKF employs an augmented state vector to estimate system states and faults simultaneously. A control mechanism is designed to compensate for the undesirable effects of the detected faults.Findings– The performance of the Nonlinear Model Predictive Controller (NMPC) without any fault compensation is compared with the proposed FTC scheme under different fault scenarios. Analysis of the simulation results indicates that the FDI method is able to identify the faults accurately. The proposed FTC approach facilitates recovery of the closed loop performance after the faults have been isolated.Originality/value– A significant contribution of the paper is the design of an FTC system by using UKF to estimate faults and enhance the accuracy of data. This is done by applying a data fusion algorithm and controlling the system by the NMPC after eliminating the effects of faults.
Simulation of nonlinear systems subject to modulated chirp signals
Authors: Condon M. , Iserles A. 
Published: July 2015

Purpose
– The purpose of this paper is to apply a novel technique for the simulation of nonlinear systems subject to modulated chirp signals.

Design/methodology/approach
– The simulation technique is first described and its salient features are presented. Two examples are given to confirm the merits of the method.

Findings
– The results indicate that the method is appropriate for simulating nonlinear systems subject to modulated chirp signals. In particular, the efficiency and accuracy of the method is seen to improve as the chirp frequency increases. In addition, error bounds are given for the method.

Originality/value
– Chirp signals are employed in several important applications such as representing biological signals and in spread spectrum communications. Analysis of systems involving such signals requires accurate, appropriate and effective simulation techniques.
New technologies of multi-layered printed circuit boards, intended of rapid-design electronic modules
Authors: Stęplewski Wojciech , Mroczkowski Mateusz , Darakchiev Radoslav , Futera Konrad , Kozioł Grażyna 
Published: July 2015

Purpose
– The purpose of this study was the use of embedded components technology and innovative concepts of the printed circuit board (PCB) for electronic modules containing field-programmable gate array (FPGA) devices with a large number of pins (e.g. Virtex 6, FF1156/RF1156 package, 1,156 pins).

Design/methodology/approach
– In the multi-layered boards, embedded passive components that support FPGA device input/output (I/O), such as blocking capacitors and pull-up resistors, were used. These modules can be used in rapid design of electronic devices. In the study, the MC16T FaradFlex material was used for the inner capacitive layer. The Ohmega-Ply RCM 25 Ω/sq material was used to manufacture pull-up resistors for high-frequency pins. The embedded components have been connected to pins of the FPGA component by using plated-through holes for capacitors and blind vias for resistors. Also, a technique for a board-to-board joining, by using castellated terminations, is described.

Findings
– The fully functional modules for assembly of the FPGA were manufactured. Achieved resistance of embedded micro resistors, as small as the smallest currently used surface-mount device components (01005), was below required tolerance of 10 per cent. Obtained tolerance of capacitors was less than 3 per cent. Use of embedded components allowed to replace the pull-up resistors and blocking capacitors and shortens the signal path from the I/O of the FPGA. Correct connection to the castellated terminations with a very small pitch was also obtained. This allows in further planned studies to create a full signal distribution system from the FPGA without the use of unreliable plug connectors in aviation and space technology.

Originality/value
– This study developed and manufactured several innovative concepts of signal distribution from printed circuit boards. The signal distribution solutions were integrated with embedded components, which allowed for significant reduction in the signal path. This study allows us to build the target object that is the module for rapid design of the FPGA device. Usage of a pre-designed module would lessen the time needed to develop a FPGA-based device, as a significant part of the necessary work (mainly designing the signal and power fan-out) will already be done during the module development.
Emotional management in the workplace
Authors: Cole Graham 
Published: July 2015

Purpose
– This paper aims to review the latest management developments across the globe and pinpoint practical implications from cutting-edge research and case studies.

Design/methodology/approach
– This briefing is prepared by an independent writer who adds their own impartial comments and places the papers in context.

Findings
– Statistics show that populations are aging in many countries around the world. Growth in the number of older employees in the workplace is one major consequence of this demographic shift. As such individuals have become important assets to their firm, leaders should strive to ascertain how to maximize the value they provide. How age is conceptualized determines its impact on attitudes and behaviors regarding work. Such as, involvement and satisfaction with the job and commitment toward the firm can vary depending on the way in which the employee’s age is articulated. Past research has identified subjective age and social age among the different conceptualizations. But, chronological age and age reflected by work experience are often most relevant in workplace contexts.

Practical implications
– The paper provides strategic insights and practical thinking that have influenced some of the world’s leading organizations.

Originality/value
– The briefing saves busy executives and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy-to-digest format.
Addressing the challenges of an ageing workforce: an intergenerational learning toolkit
Authors: Ropes Donald 
Published: July 2015

Purpose
– The purpose of this article is to discuss some of the challenges organizations face in regards to an ageing workforce and to present the results of an European Union project called SILVER (see www.intergenerationallearning.eu) that developed a toolkit to help management in knowledge-intensive organizations deal with older personnel in a positive and effective manner by organizing intergenerational learning.

Design/methodology/approach
– This study involved interviews with 32 international human resource managers and a local survey of more than 1,100 mid and upper-level managers. Testing and evaluation of the toolkit was done in 43 organizations.

Findings
– Older workers bring several challenges with them, namely, ensuring continuous learning, social issues and diversity. The toolkit helps to deal with these challenges in a flexible and constructive way.

Originality/value
– This article gives insights into how older workers can positively contribute to learning in organizations.
The cultural similarities of work as dignity: bringing sense of community in business organizations
Authors: Palliam Ralph , Ankli Robert 
Published: July 2015

Purpose
– The pursuit of the culture of work as dignity is rarely a focus of scholarly writings. One dominant, widely shared and accepted cultural value of work ethic is the belief that it is work that accords dignity to a human being. While seemingly neglected in traditional management research, the concepts of dignity and well-being have experienced renewed attention from the humanities and social sciences. The ability to utilize this sense of dignity becomes a critical role of human resources in advancing self-worth and self-respect. The relationships between worker and management are considered within the culture of work as dignity.

Design/methodology/approach
– This is a conceptual paper. A theoretical foundation of work as dignity is developed. It is uses Hofstede’s analysis of work-related cultural values in different countries. Work is identified as dignity that is equated to a universal property like the doctrine of modern democracy that is enjoyed by other societies.

Findings
– If work accords dignity to humans, the ability to establish a sense of employee self-worth and self-respect and to enjoy the respect of others becomes critical objectives of management. This notion results in moving high-performance workplaces to high quality workplaces resulting in managerial conduct that is fair, equitable, reasonable and just. This paper is a call to rethink management theory from a humanistic perspective and highlights the role and protection of human dignity as a cornerstone in management theory. The concept of dignity elevates human responsibilities to the degree that they support the promotion of well-being.

Research limitations/implications
– This is a conceptual paper. A rigorous empirical study needs to be conducted to substantiate the theoretical foundation.

Practical implications
– Guidance is offered to managerial responsibility in promoting work as dignity, support for work as dignity, maintaining the dominant culture of work as dignity and identifying high-performance versus high-quality workplace.

Social implications
– Dignity is a virtue. Cultural differences play a less meaningful role and individuals become more alike than unalike. Together with the dictates of modernizing technology, there is a measure of uniformity to how everyone approaches the world.

Originality/value
– This study adds value in a somewhat different vein by presenting dignity as a central purpose of human life. This paper is a call to rethink management theory from a humanistic perspective and highlights the role and protection of human. The ability to establish a sense of employee self-worth and self-respect and to enjoy the respect of others becomes critical objectives of management. Moving high-performance workplaces to high-quality workplaces results in management conduct that is fair, equitable, reasonable and just. Human responsibilities need to be elevated to a degree that they support the promotion of well-being.
Numerical solutions of two-dimensional Burgers’ equations using modified Bi-cubic B-spline finite elements
Authors: Mittal R C , Tripathi Amit 
Published: July 2015

Purpose
– The purpose of this paper is to develop an efficient numerical scheme for non-linear two-dimensional (2D) parabolic partial differential equations using modified bi-cubic B-spline functions. As a test case, method has been applied successfully to 2D Burgers equations.

Design/methodology/approach
– The scheme is based on collocation of modified bi-cubic B-Spline functions. The authors used these functions for space variable and for its derivatives. Collocation form of the partial differential equation results into system of first-order ordinary differential equations (ODEs). The obtained system of ODEs has been solved by strong stability preserving Runge-Kutta method. The computational complexity of the method is O(p log(p)), where p denotes total number of mesh points.

Findings
– Obtained numerical solutions are better than those available in literature. Ease of implementation and very small size of computational work are two major advantages of the present method. Moreover, this method provides approximate solutions not only at the grid points but also at any point in the solution domain.

Originality/value
– First time, modified bi-cubic B-spline functions have been applied to non-linear 2D parabolic partial differential equations. Efficiency of the proposed method has been confirmed with numerical experiments. The authors conclude that the method provides convergent approximations and handles the equations very well in different cases.
Recursive parameter estimation for load sensing proportional valve based on polynomial chaos expansion
Authors: Ma Zeyu , Wu Jinglai , Zhang Yunqing , Jiang Ming 
Published: July 2015

Purpose
– The purpose of this paper is to provide a new computational method based on the polynomial chaos (PC) expansion to identify the uncertain parameters of load sensing proportional valve (LSPV), which is commonly used to improve the efficiency of brake system in heavy truck.

Design/methodology/approach
– For this investigation, the mathematic model of LSPV is constructed in the form of state space equation. Then the estimation process is implemented relying on the experimental measurements. With the coefficients of the PC expansion obtained by the numerical implementation, the output observation function can be transformed into a linear and time-invariant form. The uncertain parameter recursively update functions based on Newton method can therefore be derived fit for computer calculation. To improve the estimation accuracy and stability, the Newton method is modified by employing the acceptance probability to escape from the local minima during the estimation process.

Findings
– The accuracy and effectiveness of the proposed parameter estimation method are confirmed by model validation compared with other estimation methods. Meanwhile, the influence of measurement noise on the robustness of the estimation methods is taken into consideration, and it is shown that the estimation approach developed in this paper could achieve impressive stability without compromising the convergence speed and accuracy too much.

Originality/value
– The model of LSPV is originally developed in this paper, and then the authors propose a novel effective strategy for recursively estimating uncertain parameters of complicate pneumatic system based on the PC theory.
A locking-free coupled polynomial Timoshenko piezoelectric beam finite element
Authors: Sulbhewar Litesh N , Raveendranath P. 
Published: July 2015

Purpose
– Piezoelectric extension mode smart beams are vital part of modern control technology and their numerical analysis is an important step in the design process. Finite elements based on First-order Shear Deformation Theory (FSDT) are widely used for their structural analysis. The performance of the conventional FSDT-based two-noded piezoelectric beam formulations with assumed independent linear field interpolations is not impressive due to shear and material locking phenomena. The purpose of this paper is to develop an efficient locking-free FSDT piezoelectric beam element, while maintaining the same number of nodal degrees of freedom.

Design/methodology/approach
– The governing equations are derived using a variational formulation to establish coupled polynomial field representation for the field variables. Shape functions based on these coupled polynomials are employed here. The proposed formulation eliminates all locking effects by accommodating strain and material couplings into the field interpolation, in a variationally consistent manner.

Findings
– The present formulation shows improved convergence characteristics over the conventional formulations and proves to be the most efficient way to model extension mode piezoelectric smart beams, as demonstrated by the results obtained for numerical test problems.

Originality/value
– To the best of the authors’ knowledge, no such FSDT-based finite element with coupled polynomial shape function exists in the literature, which incorporates electromechanical coupling along with bending-extension and bending-shear couplings at the field interpolation level itself. The proposed formulation proves to be the fastest converging FSDT-based extension mode smart beam formulation.