scholarly journals Geometrical transformations and equivalent materials in computational electromagnetism

2008 ◽  
Vol 27 (4) ◽  
pp. 806-819 ◽  
Author(s):  
A. Nicolet ◽  
F. Zolla ◽  
Y. Ould Agha ◽  
S. Guenneau
Keyword(s):  
Material Properties ◽  
Design Methodology ◽  
Point Of View ◽  
The Finite Element Method ◽  
Open Problems ◽  
Content Type ◽  
Geometrical Transformation ◽  
Computational Electromagnetism ◽  
Set Up ◽  
Invisibility Cloaks

PurposeThis paper aims to review various techniques used in computational electromagnetism such as the treatment of open problems, helicoidal geometries and the design of arbitrarily shaped invisibility cloaks. This seemingly heterogeneous list is unified by the concept of geometrical transformation that leads to equivalent materials. The practical set‐up is conveniently effected via the finite element method.Design/methodology/approachThe change of coordinates is completely encapsulated in the material properties.FindingsThe most significant examples are the simple 2D treatment of helicoidal geometries and the design of arbitrarily shaped invisibility cloaks.Originality/valueThe paper provides a unifying point of view, bridging several techniques in electromagnetism.

Hydrodynamic journal bearing lubricated with a ferrofluid

2017 ◽  
Vol 69 (5) ◽  
pp. 754-760 ◽  
Author(s):  
Nimeshchandra S. Patel ◽  
Dipak Vakharia ◽  
Gunamani Deheri
Keyword(s):  
Design Methodology ◽  
Journal Bearing ◽  
Magnetic Bearing ◽  
Point Of View ◽  
Content Type ◽  
Test Conditions ◽  
Hydrodynamic Journal Bearing ◽  
Bearing Design ◽  
Set Up ◽  
Bearing System

Purpose This paper aims to investigate the performance of a ferrofluid-based hydrodynamic journal bearing system. Design/methodology/approach This paper presents a new design of ferrofluid-based hydrodynamic journal bearing. An experimental set-up consisting of a magnetic shaft along with a brass bearing was modified and developed. A permanent magnet was used to make the selected shaft material magnetic. The load and speed were varied to conduct the analyses for different test conditions. Findings The paper provides information about a design of ferrofluid-based journal bearing and its improved performances. For moderate to higher loads at different shaft speeds, it was found that because of the magnetization effect, the maximum film pressure in case of a ferrofluid lubricant increased up to approximately 60 per cent, compared with that of the conventional lubricant-based journal bearing system. Besides, the temperature rise was found smaller for ferrofluid lubricants, thus making the system cooler while running. Originality/value This paper offers a new design of magnetic bearing system for the experimental analysis by utilizing a magnetic shaft with a non-magnetic bearing. The present ferrofluid-based bearing design is less complicated from manufacturing point of view.

Comparison of the reluctance laminated and solid rotor synchronous machine operating at high temperatures

2019 ◽  
Vol 38 (4) ◽  
pp. 1111-1119 ◽  
Author(s):  
Marcin Lefik ◽  
Krzysztof Komeza ◽  
Ewa Napieralska-Juszczak ◽  
Daniel Roger ◽  
Piotr Andrzej Napieralski
Keyword(s):  
High Speed ◽  
Design Methodology ◽  
Three Dimensional ◽  
Synchronous Machine ◽  
Point Of View ◽  
Heat Sources ◽  
Model Calculations ◽  
Content Type ◽  
Thermal Phenomenon ◽  
Practical Implications

Purpose The purpose of this paper is to present a comparison between reluctance synchronous machine-enabling work at high internal temperature (HT° machine) with laminated and solid rotor. Design/methodology/approach To obtain heat sources for the thermal model, calculations of the electromagnetic field were made using the Opera 3D program including effect of rotation and the resulting eddy current losses. To analyse the thermal phenomenon, the 3D coupled thermal-fluid (CFD) model is used. Findings The presented results show clearly that laminated construction is much better from a point of view of efficiency and temperature. However, solid construction can be interesting for high speed machines due to their mechanical robustness. Research limitations/implications The main problem, despite the use of parallel calculations, is the long calculation time. Practical implications The obtained simulation and experimental results show the possibility of building a machine operating at a much higher ambient temperature than it was previously produced for example in the vicinity of the aircraft turbines. Originality/value The paper presents the application of fully three-dimensional coupled electromagnetic and thermal analysis of new machine constructions designed for elevated temperature.

Using transfer learning for diabetic retinopathy stage classification

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Enas M.F. El Houby
Keyword(s):  
Diabetic Retinopathy ◽  
Transfer Learning ◽  
Grade Level ◽  
Design Methodology ◽  
Content Type ◽  
Stage Classification ◽  
Set Up ◽  
Retinal Fundus ◽  
Automated Methods

PurposeDiabetic retinopathy (DR) is one of the dangerous complications of diabetes. Its grade level must be tracked to manage its progress and to start the appropriate decision for treatment in time. Effective automated methods for the detection of DR and the classification of its severity stage are necessary to reduce the burden on ophthalmologists and diagnostic contradictions among manual readers.Design/methodology/approachIn this research, convolutional neural network (CNN) was used based on colored retinal fundus images for the detection of DR and classification of its stages. CNN can recognize sophisticated features on the retina and provides an automatic diagnosis. The pre-trained VGG-16 CNN model was applied using a transfer learning (TL) approach to utilize the already learned parameters in the detection.FindingsBy conducting different experiments set up with different severity groupings, the achieved results are promising. The best-achieved accuracies for 2-class, 3-class, 4-class and 5-class classifications are 86.5, 80.5, 63.5 and 73.7, respectively.Originality/valueIn this research, VGG-16 was used to detect and classify DR stages using the TL approach. Different combinations of classes were used in the classification of DR severity stages to illustrate the ability of the model to differentiate between the classes and verify the effect of these changes on the performance of the model.

Frequency dependent resistance calculation of multiple conductors

2017 ◽  
Vol 36 (5) ◽  
pp. 1396-1410
Author(s):  
Tomislav Župan ◽  
Bojan Trkulja
Keyword(s):  
Design Methodology ◽  
Numerical Approach ◽  
Effective Resistance ◽  
Proximity Effects ◽  
The Finite Element Method ◽  
Frequency Range ◽  
Frequency Dependent ◽  
Content Type ◽  
Electromagnetic Devices ◽  
Practical Implications

Purpose The purpose of this paper is to present a method for calculating frequency-dependent resistance when multiple current-carrying conductors are present. Design/methodology/approach Analytical and numerical formulations are presented. Both skin- and proximity-effects are considered in the numerical approach, whereas only skin-effect can be taken into account in analytical equations. The calculation is done using a self-developed integral equation-based field solver. The results are benchmarked using professional software based on the finite element method (FEM). Findings Results from the numerical approach are in agreement with FEM-based software throughout the whole frequency range. Analytical formulations yield unsatisfactory results in higher frequency range. When multiple conductors are mutually relatively close, the proximity-effect has an impact on effective resistance and has to be taken into account. Research limitations/implications The methodology is presented using axially symmetrical conductors. However, the same procedure can be developed for straight conductors as well. Practical implications Presented fast and stable procedure can be used in most electromagnetic devices when frequency-dependent resistance needs to be precisely determined. Originality/value The value of the presented numerical methodology lies in its ability to take both skin- and proximity-effects into account. As conductors are densely packed in most electromagnetic devices, both effects influence the effective resistance. The method can be easily implemented using a self-developed solver and yields satisfactory results.

Data mining in anti-money laundering field

2017 ◽  
Vol 20 (3) ◽  
pp. 301-310 ◽  
Author(s):  
Noriaki Yasaka
Keyword(s):  
Data Mining ◽  
Knowledge Management ◽  
Money Laundering ◽  
Design Methodology ◽  
Point Of View ◽  
Important Task ◽  
Content Type ◽  
Suspicious Transaction ◽  
Mining Methods ◽  
The Creation

Purpose This report aims to focus on how suspicious transaction report is created with data mining methods and used from the point of view of knowledge management. Design/methodology/approach This paper considers data mining versus knowledge management in the anti-money laundering (AML) field. Findings In the AML field, the information and knowledge gained are not necessarily used for or shared with the related shareholders. Creating and co-evolving the network of “knowledge professionals” is the impending assignment in this industry. The first and most important task is knowledge management in the global AML field. Originality/value The report considers the creation with data mining methods and utilization from the point of view of knowledge management.

Excellence and gender

2015 ◽  
Vol 34 (1) ◽  
pp. 37-54 ◽  
Author(s):  
Farinaz Fassa
Keyword(s):  
Gender Equality ◽  
Common Good ◽  
Design Methodology ◽  
Local Level ◽  
National Level ◽  
Academic Careers ◽  
Content Type ◽  
And Gender ◽  
Set Up ◽  
Feminist Movements

Purpose – Discussing the Swiss case, the purpose of this paper is to examine how gender equality policies deal with the present requirements for scholars to be considered “excellent”. It aims to pinpoint the lines of tension or coherence between excellence, meritocracy and gender politics. Design/methodology/approach – In order to specify the norms of academic careers and their different renditions, the author draws on two studies (at local and national levels) to illustrate where the changes and resistances are taking place. Findings – The translations of a number of demands of feminist movements into the policies set up to favour equality between the sexes may combine to challenge the norms of academia as a gendered realm. Nevertheless, without strong pressure from feminists at local level and the conduct of research pursuing the enterprise of deconstructing norms, top-down policies may prove less “corrective” than affirmative action. This pressure is not only useful to build gender equality in science but also to broaden the spectrum of knowledge that can become a common good. Research limitations/implications – As neither the names nor the positions of the experts who select the candidates at national level are made public, we had to opt for other, less satisfactory means. Originality/value – The originality of the paper lies in the link made between the enhancements brought by Equalities policies and the changes they bring. It attempts to bring to light the extent to which gender equality policies conform to the neo-managerial order or challenge its norms to build a world that is more just.

scholarly journals An economic theory of Islamic finance

2017 ◽  
Vol 9 (2) ◽  
pp. 117-132 ◽  
Author(s):  
Mabid Ali Al-Jarhi
Keyword(s):  
Design Methodology ◽  
Islamic Finance ◽  
Economic Systems ◽  
Monetary Reform ◽  
Content Type ◽  
Reform Agenda ◽  
Banking And Finance ◽  
Economic Rationale ◽  
Islamic Economic ◽  
Set Up

Purpose This paper aims to provide an economic rationale for Islamic finance. Design/methodology/approach Its methodology is simple. It starts with listing the contributions to economic analysis relevant to the required rationale in the theories of banking, finance, price, money and macroeconomics, to identify the main rationale for Islamic finance. A concise description of the author’s model for an Islamic economic system, within which Islamic finance can be operational, is provided. Findings The paper finds distinct advantages of Islamic finance, when properly applied within the author’s model. Islamic finance can therefore be a candidate as a reform agenda for conventional finance. It opens the door for significant monetary reform in currently prevalent economic systems. Research limitations/implications The first limitation of the paper is that the distinct benefits of Islamic finance are all of macroeconomic types which are external to Islamic banking and finance institutions. They are therefore not expected to motivate such institutions to apply Islamic finance to the letter, without regulators interference to ensure strict application. The second limitation is the necessity to set up enabling institutional and regulatory arrangements for Islamic finance. Originality/value The results are unique as they challenge the received doctrine and provide non-religious rationale for Islamic finance.

Entrepreneurship and fintech development: comparing reward and equity crowdfunding

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ciro Troise ◽  
Diego Matricano ◽  
Elena Candelo ◽  
Mario Sorrentino
Keyword(s):  
Design Methodology ◽  
State Of The Art ◽  
Methodological Approach ◽  
Point Of View ◽  
Comparative Approach ◽  
Current Debate ◽  
Content Type ◽  
Equity Crowdfunding ◽  
Research Propositions ◽  
Practical Implications

Purpose Starting from the state-of-the-art of Fintech development, this study aims to propose some research propositions comparing reward-crowdfunding (RCF) and equity-crowdfunding (ECF). In this sense, the present research provides a comprehensive analysis of fintech development and – to conceptualize the comparison between RCF and ECF – it focuses on campaigns’ characteristics, aims and post-campaigns scenarios. Design/methodology/approach All the research propositions related to the comparison between RCF and ECF are rooted in dedicated literature. The methodological approach adopted in the present paper can be referred to theorizing. Findings This study suggests that five key elements characterize the development of fintech: regulation, infrastructure, technologies, finance and innovations. The research provides nine propositions: four related to the campaigns’ characteristics; two related to the use of crowdfunding models by entrepreneurs; and three related to the performance of crowdfunded companies. Practical implications By offering nine research propositions, this study is expected to foster and support the investigation of fintech development from an entrepreneurial and managerial point of view. Originality/value To the best of authors’ knowledge, this study is among the first to explore the fintech development and to propose a comparative approach between RCF and ECF. This research contributes to the current debate on fintech development as well as on the comparison between crowdfunding models.

Carousel fraud in terms of price manipulation

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Cecília Olexová ◽  
Milan Husťák ◽  
František Sudzina
Keyword(s):  
Tax Evasion ◽  
Design Methodology ◽  
Negative Impact ◽  
Point Of View ◽  
Legal Cases ◽  
Content Type ◽  
Price Manipulation ◽  
Legal Texts ◽  
Tax Fraud ◽  
Insight Into

Purpose The purpose of this paper is to analyse the effects of carousel fraud on the average price of goods, as one of the negative economic aspects of carousel fraud. Design/methodology/approach This paper is primarily based on the description of selected legal cases and the modus operandi of carousel fraud, the analysis of legal texts (legislation and judgments of courts) and the discussion, from the point of view of price manipulation. Findings The results of the analysis specify the negative impact of carousel fraud in the form of the distortion of reported average prices and suggest that the authorities should monitor usual or fair prices to detect cases where there is a risk of carousel fraud. Originality/value This paper brings new insight into the issue of carousel frauds by understanding the principle of carousel fraud, the motives for it, and the possibilities for detecting this type of tax fraud, which is necessary to prevent tax evasion and to preserve a state’s income.

scholarly journals The drivers of omni-channel shopping intention: a case study for fashion retailing sector in Danang, Vietnam

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Thi Hieu Hanh Truong
Keyword(s):  
Design Methodology ◽  
Recent Literature ◽  
Theoretical Perspective ◽  
Point Of View ◽  
Content Type ◽  
Customer Perception ◽  
Channel Strategy ◽  
Retail Setting ◽  
Managerial Perspective

PurposeThe purpose of this paper is to look into the mechanism in which customers involve themselves in omni-channel retail setting and use its advantages.Design/methodology/approachVia an empirical analysis through surveying customers, this paper assesses and confirms the drivers of omni-channel shopping intention within the context of fashion retailing sector in Danang.FindingsThe findings highlight the significance of customer perception of research shopping (including showrooming and webrooming) behaviours, compatibility and risk to their intention towards omni-channel shopping, implying profound understanding of designing effective omni-channel retailing strategy.Originality/valueFrom a theoretical perspective, comprehending customer perception of the omni-channel concept has emerged as an important theme in recent literature as well as in practitioners' reports. Hence, the meaningful contribution of this study is the involvement in the attractive steam of study. From a managerial perspective, this study could offer guidance to retailers or managers about developing a successful omni-channel strategy from a customer point of view.

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