bluuebunny/crossref_metadata_2025_split huggingface dataset:
Classification of power quality disturbances using wavelet packet energy and multiclass support vector machine
Authors: Zhang Ming , Li Kaicheng , Hu Yisheng 
Published: February 2012

PurposeThe purpose of this paper is to develop a new method for classification of power quality (PQ) disturbances such as the sag, interruption, swell, harmonic, notch, oscillatory transient and impulsive transient.Design/methodology/approachA PQ disturbances classification system based on wavelet packet energy and multiclass support vector machines (MSVM) is proposed to discriminate seven types of PQ disturbances. The PQ disturbance signals are first decomposed into components in different subbands using discrete wavelet packet transform (DWPT). Statistical features of the decomposed signals are required to characterize the PQ disturbances. A MSVM classifier follows to classify the PQ disturbances.FindingsThe proposed method could effectively detect information from disturbance waveforms using DWPT and MSVM techniques, which is verified on over 700 samples.Research limitations/implicationsThe classification stage of the proposed method does not differentiate the disturbances occurred simultaneously.Practical implicationsThe proposed method possesses high recognition rate, so it is suitable for the PQ monitoring system for detection and classification of disturbances.Originality/valueThe paper describes a new and efficient way of classification of PQ disturbances. In this paper, an attempt has been made to extract efficient features of the PQ disturbances using DWPT. It is observed that these features can help correctly classify the PQ disturbances, even under noisy conditions. The MSVM is compared with artificial neural network (ANN) and it is found that the MSVM classifier gives the better result.
A novel self consistent calculation approach for the capacitance‐voltage characteristics of semiconductor quantum wire transistors based on a split‐gate configuration
Authors: Ragi Regiane , da Nobrega Rafael V.T. , Romero Murilo A. 
Published: February 2012

PurposeThe purpose of this paper is to develop an efficient numerical algorithm for the self‐consistent solution of Schrodinger and Poisson equations in one‐dimensional systems. The goal is to compute the charge‐control and capacitance‐voltage characteristics of quantum wire transistors.Design/methodology/approachThe paper presents a numerical formulation employing a non‐uniform finite difference discretization scheme, in which the wavefunctions and electronic energy levels are obtained by solving the Schrödinger equation through the split‐operator method while a relaxation method in the FTCS scheme (“Forward Time Centered Space”) is used to solve the two‐dimensional Poisson equation.FindingsThe numerical model is validated by taking previously published results as a benchmark and then applying them to yield the charge‐control characteristics and the capacitance‐voltage relationship for a split‐gate quantum wire device.Originality/valueThe paper helps to fulfill the need for C‐V models of quantum wire device. To do so, the authors implemented a straightforward calculation method for the two‐dimensional electronic carrier density n(x,y). The formulation reduces the computational procedure to a much simpler problem, similar to the one‐dimensional quantization case, significantly diminishing running time.
A computer‐aided design tool dedicated to isolated DC‐DC converters based on multiobjective optimization using genetic algorithms
Authors: Versèle Christophe , Deblecker Olivier , Lobry Jacques 
Published: February 2012

PurposeThis paper presents a computer‐aided design (CAD) tool for the design of isolated dc‐dc converters.Design/methodology/approachThis tool, developed in Matlab environment, is based on multiobjective optimization (MO) using genetic algorithms. The Elitist Nondominated Sorting Genetic Algorithm is used to perform search and optimization whereas analytical models are used to model the power converters. The design problem requires minimizing the weight, losses and cost of the converter while ensuring the satisfaction of a number of constraints. The optimization variables are, as for them, the operating frequency, the current density, the maximum flux density, the transformer dimensions, the wire diameter, the core material, the conductor material, the converter topology (among Flyback, Forward, Push‐Pull, half‐bridge and full‐bridge topologies), the number of semiconductor devices associated in parallel, the number of cells associated in series or parallel as well as the kinds of input and output connections (serial or parallel) of these cells. Finally, the design of an auxiliary railway power supply is presented and discussed.FindingsThe results show that such tool to design dc‐dc power converters presents several advantages. In particular, it proposes to the designer a set of solutions – instead of a single one – so that he can choose a posteriori which solution best fits the application under consideration. Moreover, interesting solutions not considered a priori can be found with this tool.Originality/valueTo the best of the authors’ knowledge, such a CAD tool including a MO procedure taking several topologies into account has not been suggested so far.
Analysis of some design choices in model based predictive control of flying‐capacitor inverters
Authors: Vyncke Thomas , Thielemans Steven , Jacxsens Michiel , Melkebeek Jan 
Published: February 2012

PurposeFlying‐capacitor multilevel converters (FCC) need a passive or active regulation of the capacitor voltages. Recently the trend is towards active control, often implemented separately from the current control. The advantages of a true multi‐variable control sparked the interest to apply Model Based Predictive Control (MBPC) for FCC. In this paper an objective analysis method to evaluate the effects of several design choices is presented. The effects of the weight factor selection, model simplification, and prediction horizon expansion for MBPC of a 3‐level FCC are analyzed in a systematical way.Design/methodology/approachThe analysis is mainly based on the mean square error (MSE) of current and capacitor voltage. The results are analysed for different lengths of the prediction horizon and for a wide range of weight factor values. Similarly the effect of a model simplification, neglecting the neutral point voltage, is studied when implementing MBPC for FCCs while considering the computational aspects. Validation of the simulation results is done by experiments on an FPGA‐based setup.FindingsIncluding the effect of the neutral point voltage considerably increases the current control quality and a much wider range of good values for the weight factor exists. As this good range is not critically dependent on the current amplitude it is possible to select one weight factor value for all operating points. Furthermore, it is concluded that increasing the prediction horizon increases the computational load without improving the control quality.Research limitations/implicationsThe effects of increasing the prediction horizon when including other controlled variables is to be investigated, as well as the robustness to modeling errors. The MSE analysis methodology is very suitable for this further research.Practical implicationsFor practitioners of MBPC in power electronics the paper proves that by means of simulations and the MSE one value for weight factor can be chosen for all operating points. The paper clearly shows that a practical implementation is feasible and demonstrates that neglecting the neutral point voltage is not good practice.Originality/valueThe MSE‐based analysis is shown to be a systematical and unbiased methodology to evaluate the effects of design choices. The results from this analysis can be directly applied in practical setups.
A simple unsynchronized two‐end algorithm for faults location and identification in electrical distribution systems
Authors: Riva Sanseverino Eleonora , Campoccia Angelo , Luisa Di Silvestre Maria , Zizzo Gaetano 
Published: February 2012

PurposeThe purpose of this paper is to identify a new and simple two‐end algorithm for fault location identification and characterization, in electrical distribution systems.Design/methodology/approachThe developed diagnostic algorithm is based on a simple model of the network using a lumped parameters representation.FindingsTest results have proved the approach to be efficient, allowing a precise fault identification and location while not requiring synchronized measures from the two ends.Research limitations/implicationsThere is a need for measurement systems at all MV/LV substations.Practical implicationsApplicability with limited investments is not possible where metering systems are not so diffused, although smart grids and DG units require such infrastructures. Moreover, utilities are quite interested in such issues, since the new required quality standards put severe constraints on faults management and clearance.Originality/valueThe paper presents a new and easier diagnostic algorithm for faults diagnosis in distribution systems.
Professional commitment, organizational commitment, and the intention to leave for professional advancement
Authors: Cho Vincent , Huang Xu 
Published: February 2012

PurposeGiven the increasing influence and importance of professionals in modern society, this study aims to investigate the influence of organizational commitment and professional commitment on professionals' intention to leave their organizations for professional advancement (ILPA).Design/methodology/approachA total of 500 members of a large Hong Kong association of computer specialists were drawn randomly from the membership list. E‐mails were sent directly to those 500 members through a web‐based survey, which is an effective way to collect confidential information and potentially reduced the resistance due to the survey sensitivity. After two follow‐ups via e‐mail, a total of 265 responses were collected with a response rate of 53 percent.FindingsThe study found that organizational affective commitment (OAC) would be more effective for reducing ILPA. For the interactions between different commitment components, there is a substitution effect of professional affective commitment (PAC) and professional continuance component (PCC) toward their impacts on ILPA.Research limitations/implicationsThe findings would be explained by the self‐justification process due to cognitive dissonance on the professional's continuance commitment and his/her affective commitment in an organization. Moreover, there would be a complementary relationship between organizational and professional commitment.Originality/valueThis study would answer the question on how to effectively avoid a professional leaving an organization.
The impact of contractors' prequalification on construction project delivery in Nigeria
Authors: Aje Isaac 
Published: February 2012

PurposePrequalification of contractors is a very important step in construction project procurement under the contract “Due Process” policy in Nigeria. The purpose of this study, therefore, is to investigate the impact of contractors' prequalification on cost, time and quality performance of construction projects.Design/methodology/approachData were collected with the aid of a questionnaire addressed to construction practitioners selected from clients, consultants and contractors' organizations. Also archival data on 77 completed building projects relating to prequalification assessment of contractors and project delivery variables were sourced from consultant quantity surveyors. The data were analysed with the aid of mean score and one‐way analysis of variance (ANOVA).FindingsThe results show that contractors' prequalification has significant impact on time and quality performance of construction projects as evidenced by p‐values of 0.039 and 0.030, respectively.Practical implicationsThe findings should provide a valuable reference for clients and consultants during contractors' prequalification and contract award.Originality/valueThe outcome of this paper will assist clients and consultants in the construction industry to carry out objective assessment of contractors' potential performance in relation to project goals prior to contract award.
Careers development in construction firms: application of Sun Tzu'sArt of Warprinciples
Authors: Yean Yng Ling Florence , Yee Lee Sing 
Published: February 2012

PurposeCareer development involves how employees manage their career advancement. This study aims to investigate the relevance of Sun Tzu'sArt of Warto career development of construction professionals with the aim of suggesting strategies that may be adopted for career development.Design/methodology/approachThe data collection technique was in‐depth interviews with 32 subjects who are Singapore‐based construction professionals. The subjects were asked 13 open‐ended questions which were developed based on theArt of War.FindingsThe main findings on the effective career development strategies are: outperforming peers by developing deep job experience and delivering excellent performance; adopting a team member posture before moving on to a team leader stance; handling office politics and conflicts effectively; maintaining flexibility and manoeuvrability in one's career; networking; and acquiring foreknowledge.Research limitations/implicationsThe study is qualitative in nature, thus, the actual effectiveness of the recommendations for career development is not known. There may also be some more strategies undisclosed by interviewees as sharing them may cause them to lose their competitive advantage.Practical implicationsThe effective strategies for career development are found. Construction professionals may adopt some military strategies that may help them in their career development.Social implicationsThe relevance of military strategies to career development in construction firms suggests that career progression is akin to war, where winning is important and strategizing to win is necessary.Originality/valueIn this paper military strategies are mapped onto career development, and relevant career advancement strategies are identified.
Collaborative innovation as the new imperative – design thinking, value co‐creation and the power of “pull”
Authors: Leavy Brian 
Published: February 2012

PurposeThis “Masterclass” for corporate leaders aims to explain how to integrate three revolutionary approaches to business innovation to stimulate and propel the creativity that remains latent in and around most organizations.Design/methodology/approachVeteran “Masterclass” author Brian Leavy believes that collaborative innovation is the new corporate imperative and explains how three sets of revolutionary thinking and practices – design thinking, value co‐creation and the power of “pull” – can create new opportunities for businesses.FindingsThe paper reveals three key lessons: within the world of business, the design perspective is now being applied to a much wider range of challenges beyond the traditional concerns of product aesthetics and ease‐of‐use, including the search for innovative strategies, business models and organizational structures and processes; the core principle of co‐creation is ‘engaging people to create valuable experiences together while enhancing network economics; and organizations need to learn how to “pull” together, and mobilize as needed, the resources to meet the demands of more engaged consumers, responsively and flexibly as they unfold.Practical implicationsInstead of thinking about “what to build,” prototyping is about “building in order to think,” and the prototyping process itself “creates the opportunity to discover new and better ideas at minimal cost.”Originality/valueThis “Masterclass” offers leaders a lesson on how three revolutionary ideas about business innovation complement each other.
Applying open innovation where your company needs it most
Authors: Muller Amy , Hutchins Nate , Cardoso Pinto Miguel 
Published: February 2012

PurposeWhile the open innovation concept proposed by Henry Chesbrough a decade ago has had some striking successes, the myriad options for engaging external partners can be daunting, so leaders need a guide for getting started that matches the needs of their firm. This paper aims to address this issue.Design/methodology/approachThe paper identifies that innovation processes involve three stages during which the business model elements are conceived and elaborated: idea‐generation, idea‐development, and commercialization. The question for leaders is: “In which of the three stages could your growth efforts benefit from an infusion of external ideas and expertise?”FindingsThe open‐innovation approach does not require a company to replace all its current research and development (R&D) efforts. But it does change the primary question leaders should be asking to “How can my company create significantly more value by leveraging external partners to bring many more innovations to market?”Practical implicationsThe article shows executives how they can systematically assess an innovation process, understand where new venture business models are weakest, and select the points at which open innovation could add some needed spark.Originality/valueThe article leads executives through two‐step process for introducing a customized open innovation program: step one, assess where your company's innovation process would benefit from external input by using five key questions; and step two, learn how to manage external relationships.
Graphical profiling of team working through participatory research
Authors: Rolfsen Monica , Ingvaldsen Jonas , Hatling Morten 
Published: February 2012

PurposeCompanies desire to improve their team organization by learning from other companies in their sector and adopting “best practice”. Researchers and consultants, who are called on to facilitate these learning processes, are confronted with the real world ambiguity and multiple meanings of “team” and “team organization”. A shared understanding of team organization is a precondition for learning and knowledge transfer between companies. This paper seeks to ask how this common understanding can be constructed.Design/methodology/approachThe paper uses participatory research and a literature review. Based on a research project involving Norwegian manufacturing companies, the paper presents and discusses a participatory process, in which a graphical profiling tool was developed and applied in order to make sense of different forms of team organization.FindingsThe paper finds that companies were actively involved in deciding what the relevant dimensions of team working were. In reflection seminars, systematical comparison between companies dissolved conceptual ambiguity and supported reflection.Research limitations/implicationsThe paper reports experiences with the mapping tool from two companies. Both are characterized by cooperative industrial relations, and openness to researchers. More research should be done in order to investigate the general workability of the process proposed here.Practical implicationsThe proposed process for constructing and using a mapping tool are relevant for consultants and researchers, who aim to facilitate learning in a multiple company context. In particular, it is relevant for dealing with popular, but unclear concepts such as “team” and “team working”. To be workable, the process should take care to involve relevant stakeholders and the profiling should avoid technical language.Social implicationsThrough a participatory approach, all participants in an organization can take part in a dialogue on team working. By introducing a common language, power distances may be reduced.Originality/valueThe general idea of using graphical profiling to support reflection is not original. The contribution is presenting and discussing a concrete participatory process for how graphical profiling can be made relevant and useful.
Maximizing effectiveness in team sports: the personal audit tool
Authors: Promise Opute Abdullah 
Published: February 2012

PurposeThis conceptual paper aims to offer a theoretical contribution that explicates the “blind spot” cultural diversity and reward diversity team conflict contingencies, and personal audit as a mechanism for managing the consequences.Design/methodology/approachThe paper suggests a framework for analysing and managing diversity (cultural and reward) driven team conflicts. Given the theoretical foundation, personal audit among team members is recommended as a tool for managing the consequences of such conflict factors.FindingsThis paper underlines the team building intervention utility for team effectiveness. It reinforces theoretical foundation that highlights conflict as a determinant of team effectiveness, and reviews two diversity dimensions of team conflicts. Finally, it suggests and explains an “active learning” personal audit model for achieving the conceptualised team effectiveness perspective.Practical implicationsThe paper highlights critical but usually overlooked team conflict intricacies in football team management. This framework offers practical relevance in enabling understanding of “attitudes and behaviours” of team members and human resource management in football marketing. Managers would benefit from this perspective and improve team effectiveness, performance and organisation's performance.Originality/valueThe paper offers valuable conceptual insight for development, one that serves the interest of management of football clubs and academia.
The impact of organizational culture on the relationship between shared leadership and team proactivity
Authors: Erkutlu Hakan 
Published: February 2012

PurposeThe purpose of this paper is to examine whether organizational culture moderates the relationship between shared leadership and team proactive behavior.Design/methodology/approachData were collected from 21 commercial banks in Turkey that had formally implemented work teams. The study used data obtained from 420 team members. Moderated hierarchical regression was used to examine the moderating role of organizational culture on the shared leadership and team proactive behavior relationship.FindingsShared leadership within a work team was positively related to team proactive behavior. The relationship of shared leadership with team proactivity is stronger in organizations with higher level of supportive culture.Research limitations/implicationsA practical implication of these results for leaders of management teams is that sharing some leadership roles and responsibilities within their teams with other members may have positive effects for the proactivity of the team as well as the satisfaction of the team members. The generalizability of the results may be limited by sources of funding of the banks studied and demographic factors such as participants' age, gender and organizational tenure.Originality/valueThe use of organizational culture as a moderator on this link is unprecedented. Although shared leadership within teams may increase job demands on members and require them to take on new roles, it seems to have positive effects on perceptions of their jobs. In addition, the extent to which an organization encourages a supportive culture makes a difference in the relationship of shared leadership with team proactivity. Finally, using a large number of samples from Turkish banking sector adds to the growing literature examining shared leadership in non‐Western settings.