bluuebunny/crossref_metadata_2025_split huggingface dataset:
A new inverse controller for servo‐system based on neural network model reference adaptive control
Authors: Zhao Bo , Hu Hongjie 
Published: November 2009

PurposeThe purpose of this paper is to develop a new inverse controller for servo‐system position tracking control based on neural network (NN) and model reference adaptive control (MRAC).Design/methodology/approachFirst, the model of general servo‐systems is analyzed. Then, a MRAC based on neural network control (NNC) is proposed with mathematical prove of stability. In addition, several simulation cases and experiments are listed to verify the usability of the control scheme.FindingsThis scheme consists of an MRAC, an online NN controller and a robust controller in velocity‐loop. For reducing influence which arose from modeling error, unknown model dynamics, parameter variation, and load changes, the NN controller is introduced to counteract the various influence mentioned above dynamically. MRAC, NNC, and robust controller adjust system to track the approximate velocity‐loop reference model. In this way, the position‐loop is not sensitive to the disturbance on velocity‐loop, and the whole velocity‐loop can be treated as a simple linear model when designing the other parts of the system. In addition, a novel inverse control method based on linear velocity signal filter is introduced to this scheme. In this case, the MRAC, NNC, and robust controller perform as an adaptive inverse controller, which keeps the velocity signal tracking the position loop controller output.Originality/valueThe paper presents a new inverse controller with NNC and MRAC which is practical and flexible.
Simulation on vehicle routing problems in logistics distribution
Authors: Fan Wenhui , Xu Huayu , Xu Xin 
Published: November 2009

PurposeThe purpose of this paper is to formulate and simulate the model for vehicle routing problem (VRP) on a practical application in logistics distribution.Design/methodology/approachBased on the real data of a distribution center in Utica, Michigan, USA, the design of VRP is modeled as a multi‐objective optimization problem which considers three objectives. The non‐dominated sorting genetic algorithm II (NSGA‐II) is adopted to solve this multi‐objective problem. On the other hand, the VRP model is simulated and an object‐oriented idea is employed to analyze the classes, functions, and attributes of all involved objects on VRP. A modularized objectification model is established on AnyLogic software, which can simulate the practical distribution process by changing parameters dynamically and randomly. The simulation model automatically controls vehicles motion by programs, and has strong expansibility. Meanwhile, the model credibility is strengthened by introducing random traffic flow to simulate practical traffic conditions.FindingsThe computational results show that the NSGA‐II algorithm is effective in solving this practical problem. Moreover, the simulation results suggest that by analyzing and controlling specific key factors of VRP, the distribution center can get useful information for vehicle scheduling and routing.Originality/valueMulti‐objective problems are seldom considered on VRPs, yet they are of great practical value in logistics distribution. This paper is mainly focused on multi‐objective VRP which is derived from a practical distribution center. The NSGA‐II algorithm is applied in this problem and the AnyLogic software is employed as the simulation tool. In addition, this paper deals with several key factors of VRP in order to control and simulate the distribution process. The computational and simulation results regarding VRPs constitute the main contribution of our paper.
Improvement to the second‐order rational functions approximation for hysteresis cycles of magnetic materials
Authors: Pagnola M.R. , Saccone F.D. , Ozols A. , Sirkin H. 
Published: November 2009

PurposeThe purpose of this paper is to introduce a simplified method, based on an improvement to the actual second‐order approximation to magnetic hysteresis curves, to calculate an estimation of quasi‐static hysteresis loops of ferromagnetic materials.Design/methodology/approachThe addition of a new dB(B) function is proposed to second‐order rational approximation for the upward and downward magnetic quasi‐static hysteresis loop. The new semi‐empirical approach is tested with typical cycles of commercial Ni‐ferrites (ferroxcube) and Ni standards using a vibrating sample magnetometer (VSM).FindingsThe model is simple and a fast tool to reproduce with reasonable accuracy the hysteresis loops based on appropriate parameters of materials under analysis. The proposed extension to the Rivas model has reduced the maximum difference between experimental and modeled values from 19 to 0.08 per cent in the approximation to different hysteresis cycles of the magnetic materials studied here.Originality/valueThis paper presents an improvement to second‐order rational functions approach for fitting of hysteresis loops with simple added functions.
A computation method for scenario studies in WDM network planning
Authors: Yiming Zhang James , Wu Jing , v. Bochmann Gregor , Savoie Michel 
Published: November 2009

PurposeThe purpose of this paper is to present the benefits of using the Lagrangian relaxation (LR) and subgradient methods in scenario studies for wavelength division multiplexing (WDM) network planning. The problem of WDM network planning for a given set of lightpath demands in a mesh topology network is to select lightpath routes and then allocate wavelength channels to the lightpaths. In WDM network planning, a scenario study is to find out the network performance under different lightpath demands and/or different network resource configurations.Design/methodology/approachA scenario study must solve a series of related static WDM network planning problems. Each static WDM network planning problem is an optimization problem, and may be formulated as an integer linear programming problem, which can be solved by the proposed Lagrangian relaxation and subgradient methods. This paper uses the Lagrange multipliers that are obtained from previous scenarios as initial Lagrange multiplier values for other related scenarios.FindingsThis approach dramatically reduces the computation time for related scenarios. For small to medium variations of scenarios, the method reduces the computation time by several folds. The proposed method is the first method that effectively considers the relations between related scenarios, and uses such relations to improve the computation efficiency of scenario studies in WDM network planning.Practical implicationsThe method improves the efficiency of a scenario study in WDM network planning. By using it, many “what‐if” type of scenario study questions can be answered quickly.Originality/valueUnlike other existing methods that treat each scenario individually, this method effectively uses the information of the relation between different scenarios to improve the overall computation efficiency.
Application of evolutionary algorithms with adaptive mutation to the identification of induction motor parameters at standstill
Authors: Orlowska‐Kowalska Teresa , Lis Joanna 
Published: November 2009

PurposeThe purpose of this paper is to obtain a preliminary off‐line identification of induction motor (IM) parameters at standstill in a reasonable calculation time, which will be useful for the initial adjustment of controllers and state observer parameters in the sensorless drive system.Design/methodology/approachThe identification procedure of electrical parameters of IM equivalent circuit is performed at standstill and is based on the reconstruction of the stator current response to the forced stator voltage using evolutionary algorithms (EAs) with hard selection and different mutation schemes.FindingsIt is shown that an application of the EA with adaptive mutation mechanism based on simulated annealing method gives very good accuracy of parameters identification and the shortest execution time of the identification procedure as well in simulation as in the experimental tests.Research limitations/implicationsThe investigation looks mainly at the minimization of the execution time of the identification algorithm and on the identification accuracy performance, taking into account the good approximation of the measured stator current response.Practical implicationsThe proposed EA with the improved adaptive mutation scheme can be easily realised using modern digital signal processor (DSP), which is usually applied for control purposes of the sensorless IM drive system with vector control. The implementation is tested in experimental setup with floating point DSP used as the system controller.Originality/valueThe application of adaptive mutation with simulated annealing in the EA with hard selection for the fast, off‐line preliminary identification of the IM parameter at standstill.
Numerical field calculation of stator winding faults in synchronous machines
Authors: Rosendahl Jens , Kulig Stefan 
Published: November 2009

PurposeThe purpose of this paper is to describe a systematic investigation of the currents, torques and other electromagnetic quantities in a machine after different short circuits by the means of coupled numerical field and network calculation. The behaviour of a synchronous machine after a stator‐winding fault still is a little known issue. Nevertheless, the occurrence of winding faults can damage the stator winding of the machine severely and may also destroy the whole stator core. Therefore, there exists a strong need for reliable calculation methods for the evaluation of these faults, e.g. the reconstruction of the details of an accident.Design/methodology/approachThe paper discusses an analytical approach which calculates all possible winding connections when absence of nonlinear material behaviour is assumed and nonlinearity is only considered by adjusting the inductances after solving the differential equations. In the following, a more accurate method is given by the numerical field calculation, considering a two‐dimensional time variant permeability distribution on the cross‐section of an electrical machine.FindingsFirst results of transient time‐stepping calculations of short circuits with special respect on winding currents and radial forces on the rotor are presented.Practical implicationsThe approach presented in this paper can be applied in the field of R&D for the dimension of electrical machines and its protection system as well as for the investigation of possible sources of an occurred machine failure.Originality/valueThe bulk of publications that contribute to the topic of inner winding faults are comprised of derivations of analytical models with the assumption of linear material behaviour. The paper puts strong emphasis on the consideration of the nonlinearity.
Magnetic flux density and vector potential of linear polyhedral sources
Authors: Fabbri Massimo 
Published: November 2009

PurposeThe purpose of this paper is to evaluate analytically the magnetic flux density and the magnetic vector potential produced by a linear current density or a linear magnetization inside an arbitrary polyhedron.Design/methodology/approachIn order to obtain expressions of the field and potential integrals in an intrinsic vector form, independently of any reference frame, the approach is to avoid the use of a local coordinate system to perform the integrations.FindingsThe expressions obtained contain only the same functions just needed for the uniform sources case, do not introduce any new singularity or discontinuity, and computed results illustrate their effectiveness.Research limitations/implicationsBeing in intrinsic vector form the expressions obtained are well suited to cope with the data structures, i.e. faces‐edges and edges‐vertices incidence matrices, provided by unstructured polygonal meshes generators. Their use, especially when dealing with a generic mixed unstructured polygonal mesh, avoids the need of different routines, thus decreasing the complexity of the numerical code.Practical implicationsBesides, avoiding numerical integration, the results do not require usage of any function other than those already defined for the uniform sources case, and do not introduce any new singularity or discontinuity. Thus, the calculation of the magnetic flux density and the magnetic vector potential produced by linear sources needs nearly the same effort as the uniform sources one.Originality/valueThe closed‐form expressions obtained are in intrinsic vector form and can be implemented in a unique routine suitable for the calculation of the magnetic flux density and vector potential produced by any linear or uniform polyhedral source.
Up for sale: consumer medical information
Authors: Levy Marian , Royne Marla B. 
Published: November 2009

PurposeThis paper aims to examine privacy breaches in personal health record information that expose consumers to unsolicited marketing.Design/methodology/approachExamples of: data theft by healthcare workers; sale of consumer health data by entities not covered by the Health Insurance Portability and Accountability Act (HIPAA); and piracy of health data through sophisticated internet targeted marketing.FindingsThis paper finds that HIPAA's strict safeguards to medical privacy are not extended to database companies that aggregate data for electronic medical records, a source of highly profitable information that is purchased by advertisers. Similar health information is obtained by marketers through consumer “health surveys” completed on web‐based health information sites or at community health screenings.Practical implicationsConsumer education is warranted to ensure awareness of privacy breaches and vigilance against loss of personal and protected health information to marketers.Originality/valueThe paper highlights the areas for protecting consumers via identifying loopholes in HIPAA, as well as pointing out consumer behavior that can lead to subtle, yet systematic exploitation of their health information for profit via marketing.
Examining customer privacy concerns in dealings with financial institutions
Authors: Tsarenko Yelena , Rooslani Tojib Dewi 
Published: November 2009

PurposeThis paper aims to develop a customer typology based on consumer attitude towards information privacy and examine the driving factors of privacy concern.Design/methodology/approachA sample of 456 Australian consumers who have applied for a credit card or mortgage is used in this study. Consumer concern with privacy statements, the privacy legislation at the federal level, trust and the willingness to disclose personal information for some form of compensation are used as drivers of consumer privacy in regression analysis. These variables are used in cluster analysis in order to segment financial consumers.FindingsThe results indicate that that the level of privacy concern is primarily driven by trust that far outweighs any concerns with privacy statements and the provision of nationally legislated safeguards. Furthermore, a cluster analysis reveals three distinctive customer segments in the domain of financial services: the pragmatist, indifferent, and competent.Originality/valueThis study is undertaken to advance our knowledge on consumer privacy concerns in the context of financial services and to segment financial services customers in relation to the disclosure of personal information. The study contributes to the literature and enhances our understanding not only on drivers of consumer privacy but also on specific areas of privacy concern among various customer segments.
Preserving patient privacy in the quest for health care economies
Authors: Laric Michael V. , Pitta Dennis A. 
Published: November 2009

PurposeThe purpose of this paper is to investigate the threats to patient privacy inherent in the movement to reduce health care costs by digitizing health care information.Design/methodology/approachThe paper applies relevant organizational theories to the health care information privacy arena, and predicts different privacy outcomes depending on the model organizations adopt to manage their information processing practices.FindingsPublic policy makers who value preservation of patient health care information privacy, can predict the relative safety of information based on the organizational model used by companies which handle that data. Propositions advanced by these theories to explain business processes are reviewed to the extent they help explore the relationships between the users and managers of the digitized health records, and the privacy of the patients' health‐records. The paper offers a series of implications for marketers based on the framework.Research limitations/implicationsThe findings are most applicable to health care systems that do not already sacrifice privacy in the name of economy.Practical implicationsThe findings can be used to insure the security of health care information.Originality/valueThe paper addresses a recent trend motivated by the need to make health care accessible to more people. Rising health care costs have forced lawmakers and marketers to seek more efficient processes to reduce costs. One unintended consequence is that economies sacrifice privacy.
Consumer privacy issues in mobile commerce: a comparative study of British, French and Romanian consumers
Authors: Gurău Călin , Ranchhod Ashok 
Published: November 2009

PurposeThis paper aims on one hand to provide a comparison of mobile consumers' perceptions regarding privacy issues in three different national and cultural contexts (England, France and Romania), and on the other hand, to investigate the strategic approach taken by respondents for protecting their privacy.Design/methodology/approachBoth secondary and primary data are collected and analysed. Secondary data collection focuses on the topic of consumer privacy issues in mobile commerce. Primary data collection was realised between March‐June 2008, when 300 mobile device users answered to a face‐to‐face questionnaire, in each of the three investigated countries.FindingsBoth the country of origin and the personal profile of users, are influencing their perception regarding privacy threats in the mobile commerce environment, as well as the privacy protection strategy they adopt.Research limitations/implicationsThis study has an exploratory approach, the results being mostly descriptive. The findings can provide a useful insight for marketers, legislators and consumers regarding the privacy related concerns and behaviours in the mobile commerce environment.Originality/valueThis study realises a multi‐country comparative analysis regarding the perceptions of mobile device users, and investigates the influence of their profile on the personal privacy protection strategy adopted in the mobile commerce environment.
Modeling patronage behavior: a tri‐partite conceptualization
Authors: Yavas Ugur , Babakus Emin 
Published: November 2009

PurposeBy using mall patronage behavior as its context, this study aims to develop and test a patronage model consisting of three dimensions.Design/methodology/approachData for the study are collected through self‐administered questionnaires from residents in an MSA in the USA. Usable responses are obtained from 319 residents.FindingsResults suggest that mall patronage behavior can be represented as a global construct with three viable components (utilitarian, hedonic and accessibility).Research limitations/implicationsThe study is limited to a particular sample. Replications among other samples in the study locale and elsewhere are needed to validate the current findings.Practical implicationsThe results enable management to look at shoppers' patronage behaviors at three levels. At the individual attribute level (first level of abstraction), management may identify areas that need special attention. At the second level of abstraction (the latent construct), choice attributes can be combined into reliable and valid composite scores across dimensions and can reveal information that is not readily available by the individual attributes. At the third and highest level of abstraction, the one second‐order factor with three first‐order factors as its reflective indicators provides management with a single metric for comparing a mall with its competitors or other malls owned by the corporation.Originality/valueThe model tested here explicitly recognizes accessibility as a distinct patronage dimension and expands the domain of inquiry beyond the initial attribute level to the first‐order and the second‐order composite levels.
Introducing RefAware: a unique current awareness product
Authors: McKee Susan , Koltutsky Laura , Vaska Marcus 
Published: November 2009

PurposeThe purpose of this paper is to review RefAware, a new current awareness product introduced to the University of Calgary in September 2008. Coinciding with the product's launch, a team of three librarians was established to develop expertise with RefAware and promote it within the library and across campus.Design/methodology/approachA brief overview of current awareness tools leads into a discussion of key features available in RefAware, supplemented by a detailed section guiding the user through the product. In addition to highlighting key promotional undertakings, comparisons are drawn between RefAware and Ingenta, one of the earliest current awareness services used by the University of Calgary Library.FindingsBenefits of using this current awareness tool include access to current and reliable information, ability to search within multiple disciplines on a predetermined topic, the convenience of receiving alerts when new information becomes available, and direct export to RefWorks. Limitations include inability to combine search profiles into one search string, cumbersome source list creation tools, inconsistent functionality when exporting citations, and lack of clarity with regards to classification of source names.Practical implicationsWhile its capability to simultaneously search through many new electronic publications makes it a multi‐disciplinary electronic journal, RefAware should be viewed as a complement to other research tools, not as a replacement.Originality/valueAn objective review of this new current awareness product for librarians is provided.
Cloud computing and collaboration
Authors: Scale Mark‐Shane E. 
Published: November 2009

PurposeThe trends in library systems today is to utilize Web resources and services that the library does not own to provide services and useful innovations for library users. This paper aims to explore the two concepts behind this new trend. Explored will be the concept of cloud computing and Web collaboration, the ideas that are revolutionizing library automation in the 21st century.Design/methodology/approachThe paper focuses on the two ideas driving library automation innovations, Web collaboration enabled by cloud computing.FindingsCloud computing facilitates external collaboration, which in turn causes libraries to provide innovative Web services for users.Originality/valueThe paper showcases how library managers can provide new useful library services for users using Web software that are not necessarily owned by the library. The author also advocates a new approach to the online public access catologue (OPAC) utilizing the new library automation trends.