bluuebunny/crossref_metadata_2025_split huggingface dataset:
Implementation of sensorless IPMSM drive using the stator current space vector orientation reference frame
Authors: Najjar-Khodabakhsh Abbas , Soltani Jafar 
Published: April 2016

Purpose
In this paper an adaptive nonlinear control scheme has been proposed for direct torque and flux control of interior permanent magnet synchronous motor (IPMSM) without using mechanical sensor.

Design/methodology/approach
In this control method the stator resistance is online estimated by adaptive input-output state feedback linearization (AIOFL) controller. Based on proposed control scheme, the strategies of the maximum torque per ampere (MTPA) and maximum power factor (MPF) have been tested using a so-called stator flux search method.

Findings
The motor equations are transferred from the stationary reference frame to the (SX-SY) two-axis frame of the current by the stator current angle. In this frame, the Y component of the motor current is set to zero and the implementation of the nonlinear controller is independent of the two-axis inductances, the rotor magnetic flux, and position.

Practical implications
The effectiveness and capability of the proposed control method has been verified by simulation and experimental results. The proposed control scheme can be used for the sensorless control of IPMSM drive in industrial applications such as electric vehicle, traction system, and air conditioner.

Originality/value
The proposed controller is developed in a special axis (X-Y) rotating reference frame with the X-axis in coincide with the machine current space vector so that there is no need to use and know the machine inductances and rotor position.
Power flow optimization in a microgrid with two kinds of energy storage
Authors: Rigo-Mariani Remy , Roccuzzo Vincenzo , Sareni Bruno , Maurizio Repetto , Robaum Xavier 
Published: April 2016

Purpose
The paper presents the optimization of the power flows inside a microgrid with renewable sources and two kinds of storage. The considered microgrid consists in commercial buildings with maximum daily peak value of 50 kW, photovoltaic arrays with total capacity of 175 kW, a 50 kW/50 kWh high speed flywheel storage and a 50 kW/50 kWh set of Li-ion accumulators.

Design/methodology/approach
The power flows in the microgrid are optimized the day ahead at one hour discretization in order to minimize the electric bill. Several scheduling strategies are proposed for solving the corresponding optimization problem including standard deterministic methods, stochastic algorithms and hybrid heuristics.

Findings
All scheduling strategies investigated in the paper are compared with regard to their accuracy and computational time.

Originality/value
Beyond the comparison of different algorithms devoted to the power flow optimization problem, our approach also addresses the integration of battery ageing in the scheduling strategy.
Analytical frequency modeling of a diode rectifier: formulation for SQP solving versus formulation for Newton-Raphson solving
Authors: Tran Le Nhat Hoang , Gerbaud Laurent , Retiere Nicolas , Nguyen Huu H. 
Published: April 2016

Purpose
Static converters generate current harmonics in grids. Numerous studies on analytical frequency models of converters are often required to carry out their harmonic modeling in the context of sizing by optimization. Some formulations are proposed to solve such models. Each formulation has its own advantages and drawbacks. The paper mainly focuses on two formulations: the first to be solved by Sequential Quadratic Programming (SQP) and the second to be solved by Newton-Raphson (NR). In this way, the paper presents the performances of each formulation and compares the results of both formulations for the modeling of a single-phase diode rectifier.

Design/methodology/approach
The paper aims to compare SQP formulation and NR formulation, and to propose the ways to improve their convergence. In the modeling, by using an explicit formulation of the state variables combined to a numerical method, equations are defined to reduce, as far as possible, the number of unknowns.

Findings
The difficulty is to find the good operating mode of the static converter. So, outside the equations and the constraints, the paper proposes to use the eigenvalues of the state space matrixes to initialize the duration of every configuration and to consider the operating symmetries of the static converter that allow to reduce the research area and also the variables calculated.

Research limitations/implications
The number of the conducting phase per half period is a priori, as the operating mode.

Originality/value
The modeling is based on the use of linear components, ideal switches and the static converter operates in steady-state. The main difficulties are to formulate the equations representing the non-controlled switching of semiconductors, and to solve them.
Enhancing the employability of IT graduates in Vietnam
Authors: Thang Phan Vo Minh , Wongsurawat Winai 
Published: April 2016

Purpose
– The purpose of this paper is to identify the key determinants of employability of information technology (IT) graduates in Vietnam and examines their impact on self-perceived employability and the duration of the job search.

Design/methodology/approach
– This study is based on data collected from the responses to an online survey from more than 500 IT graduates from different higher education institutions in Vietnam. Employability, its outcome and its key determinants were integrated into one model. Exploratory factor, confirmatory factor and path analyses were conducted to test the model by means of structural equation modeling.

Findings
– The self-perceived employability of IT graduates in Vietnam was determined by graduates’ English language skills, soft skills, adaptability skills, the quality of the institution’s IT program and job seeking efforts. Results also indicated that work experience, professional competencies and employability made the job search duration shorter, but job seeking efforts made job search duration longer.

Research limitations/implications
– Only determinants from individual and institutional aspects were considered, and the sample was also limited to one profession in one country.

Practical implications
– Results can inform students and educators about the improvable areas of employability enhancement.

Originality/value
– This study fills a gap in the employability research by providing a quantitative explanation about relationships among the employability, the job search duration and their key predictors from different aspects.
Graduates’ perceptions of competencies and preparation for labour market transition
Authors: Monteiro Sílvia , Almeida Leandro , Aracil Adela Garcia 
Published: April 2016

Purpose– The purpose of this paper is to explore the influence of work experience and gender on graduates’ perception of competencies, preparation and expectations of success in labour market (LM) transition. The research questions that guide this study are: How do graduates evaluate the competencies acquired during their masters’ degree? How do graduates evaluate their preparation for transition to the LM and their expectations of success?Design/methodology/approach– Within the framework of employability models, the authors explore the perception of competencies developed during higher education (HE). Given previous reported effects of gender and work experience on the process of work transition, these two variables are also considered. A questionnaire was administered to 411 students in their final masters’ degree year. Descriptive and inferential statistics, namely, univariate analysis of variance (F-anova 2×3) withpost-hocmultiple comparison test (post-hocHSD of Tukey), are developed to analyse the data and address the research questions.Findings– The main results show that there are no significant group differences concerning perception of the development of competencies; the effect of work experience on perceptions related to preparation for transition to the LM depends on gender; and expectations of successful transition to the LM are related to gender, with no significant influence of prior work experience.Originality/value– These data suggest that, in developing their programmes, it is important for HE institutions to consider self-beliefs related to students’ diversity, in order to maximize the development and effective use of competencies and individual resources in work contexts, for all students. Exploration of the effect of gender and work experience on perceptions of competencies and preparation for the LM should help HE institutions define curricular programmes and support graduates in preparing for entry to the LM.
From cultural intelligence to supply chain performance
Authors: Tuan Luu Trong 
Published: April 2016

Purpose– Cultural intelligence (CQ) has transcended its role of adaptation to local values toward narrowing the cultural gap between foreign stakeholders and local stakeholders in the supply chain. The purpose of this paper is to decipher the catalyzing role of CQ in its chain effect, through corporate social responsibility and trust, to supply chain performance and competitive intelligence (CI).Design/methodology/approach– The proof for the research model was derived from the SEM-based analysis of cross-sectional data provided by 392 respondents from MNCs in Vietnamese business landscape.Findings– Findings, from this inquiry, produce the evidence for the positive effect of all four dimensions of CQ (metacognitive, cognitive, motivational, and behavioral CQ) on ethical and legal CSR, as well as knowledge-based and identity-based trust, which leverage supply chain performance. The connectivity between supply chain performance and CI was also established.Originality/value– Supply chain literature, from this research model, has increased its breadth with the novel role of CQ and stakeholder-oriented levers such as CSR in heightening supply chain performance.
Logistics activities in supply chain business process
Authors: Marchesini Márcia Maria Penteado , Alcântara Rosane Lúcia Chicarelli 
Published: April 2016

Purpose
– The purpose of this paper is to propose a set of logistics activities for each key supply chain business process of the Global Supply Chain Forum (GSCF) model and a conceptual framework to guide their implementation.

Design/methodology/approach
– A literature review on supply chain management (SCM) and logistics was conducted to integrate the existing knowledge of SCM, key business processes, and logistics; the latter is critical element for the success of SCM. A set of logistics activities and a conceptual framework are presented to guide their implementation in each of the key business process of the GSCF model. Three case studies were conducted in Brazilian food companies to verify the applicability of the proposed logistics activities, their characterization, and the conceptual framework.

Findings
– The logistics activities, the key business processes, and the steps to their implementation are integrated into a comprehensive framework. A total of 24 logistics activities and a conceptual framework to guide their implementation for each key business process of the GSCF model were proposed focussing on competitive advantage in a supply chain environment.

Originality/value
– The need for and the benefits derived from the involvement of the logistics in the key business processes of SCM have been reported in the literature, but the logistics activities in these processes and the way they were implemented have not yet been identified. According to Eisenhardt and Graebner (2007), building theory from case studies is an increasingly popular and relevant research strategy that involves using one or more cases to create theoretical constructs, propositions, and/or midrange theory from case-based empirical evidence. Therefore, the research gap to be filled with this manuscript is: “How does the involvement of the logistics area in the key business processes of the GSCF model occur?” The research question of the present study is: “Which activities are performed by the logistics area in the key business processes of the GSCF model and how to implement them?”. This study bridged the research gap and answered the research question by creating a theoretical construct through a conceptual framework to guide the implementation of the logistics activities for each key business process of the GSCF model. This paper aimed to extend the existing theory since the available literature has yet not addressed this research question at all.
Energy-constrained and low-carbon scenarios for the transportation and logistics industry
Authors: von der Gracht Heiko A. , Darkow Inga-Lena 
Published: April 2016

Purpose– There is consensus among experts that the design of future supply chains will have to focus more strongly on environmental concerns. Sustainability will play a major role within the business and has an impact especially on the distant future. Thus, supply chain executives are challenged in designing sustainable supply chains for the future. The paper aims to discuss this issue.Design/methodology/approach– The authors develop expert-based scenarios, which describe how future supply chains could evolve by 2030. The authors focus on the transportation and logistics industry’s perspective to provide an industry-internal view. The data collection is based on an internet-based Delphi survey. Overall, 48 top executives from 20 countries, representing academic, governmental, and industrial perspectives, participated in the survey.Findings– The authors operationalized the research question into five concrete sub-topics relevant for investigation: energy and emissions, consumer behaviour, future transport modes, design of future supply chains, and innovation. The authors derive five Delphi-based scenarios defined by clusters of their impact and expected probability: measurement and control of CO2-emissions; integrated low energy logistics systems; business-as-usual logistics; no-frills logistics and alternative fuels. Each cluster contributes differently to supply chain strategy.Originality/value– The authors address the major issues and challenges experts expect regarding future supply chains in an energy-constrained, low-carbon world. Five scenario clusters evolved for supply chain strategy development. Finally, the authors make recommendations towards strategic planning in the transportation and logistics industry.
Are firms paying more for performance?
Authors: Forth John , Bryson Alex , Stokes Lucy 
Published: April 2016

Purpose
– The purpose of this paper is to investigate changes in the economic importance of performance-related-pay (PRP) in Britain through the 2000s using firm-level data.

Design/methodology/approach
– The authors utilise nationally representative, monthly data on the total wage bill and employment of around 8,500 firms. Using these data, the authors decompose the share of the total economy-wide wage bill accounted for by bonuses into the shares of employment in the PRP and non-PRP sectors, the ratio of base pay between the two sectors, and the gearing of bonus payments to base pay within the PRP sector.

Findings
– The growth in the economic importance of bonuses in Britain in the mid-2000s – and subsequent fluctuations since the onset of recession in 2008 – can be almost entirely explained by changes in the gearing of bonus to base pay within the PRP sector. There has been no substantial change in the percentage of employment accounted for by PRP firms; if anything it has fallen over time. Furthermore, movements in the gearing of bonuses to base pay in the economy are heavily influenced by changes in Finance: a sector which accounts for a large proportion of all bonus payments in Britain.

Research limitations/implications
– The paper demonstrates the importance of understanding further how firms decide the size of bonus payments in a given period.

Originality/value
– This is the first paper to present monthly firm-level data for Britain on the incidence and size of bonus payments in the 2000s.
The impact of overeducated and undereducated workers on establishment-level productivity
Authors: Grunau Philipp 
Published: April 2016

Purpose– Many contributions to the educational mismatch literature address the productivity effects of both excess and deficit educational attainments for workers at the individual level. Due to the limited transferability of their results to establishment-level performance, especially when allowing for the possibility of spillover effects from mismatched workers to their well-matched colleagues, from an employer’s point of view, it is highly important to know the net effect of educationally mismatched employees on productivity at the establishment level. The paper aims to discuss these issues.Design/methodology/approach– This paper analyses the impact of overeducated and undereducated workers among an establishment’s workforce on its productivity, providing first representative evidence for Germany. Using linked employer-employee data from Germany, the author estimates dynamic panel production functions using a system GMM estimator.Findings– The author finds that undereducated workers among an establishment’s workforce impair its (establishment-level) productivity, implying that an establishment’s HR management should avoid the recruitment of undereducated workers, at least if they follow a short-term personnel policy. The effect for overeducated employees is also negative, albeit small and insignificant.Originality/value– The consideration of the phenomena of over and undereducation from the employer’s point of view provides further insight into the consequences of educational mismatch.
Cognitive presence in virtual collaborative learning
Authors: Beckmann Jennifer , Weber Peter 
Published: April 2016

Purpose
The purpose of this study is to introduce a virtual collaborative learning setting called “Net Economy”, which we established as part of an international learning network of currently six universities, and present our approach to continuously improve the course in each cycle.

Design/methodology/approach
Using the community of inquiry framework as guidance and canonical action research (CAR) as the chosen research design, the discussion forum of the online course is assessed regarding its critical thinking value. We thereby measure critical thinking with the help of the according model provided by Newman et al. (1995), which differentiates 40 indicators of critical thinking from 10 different categories.

Findings
The calculated critical thinking ratios for the analyzed two discussion threads indicate a strong use of outside knowledge, intensive justification and critical assessment of posts by the students. But at the same time, there are also weak spots, like manifold repetitions. Based on these results, we derive changes for the next course cycle to improve the critical thinking of the students.

Originality/value
A comparison of the results after the next course cycle will then allow us to assess the effects of the implemented changes, which would not be possible without a critical thinking diagnosis approach.
Do group affiliated firms specialize in debt? Evidence from Pakistan
Authors: Malik Qamar Uz Zaman , Afza Talat 
Published: April 2016

Purpose
– The purpose of this paper is to examine the debt structure of group affiliated firms in Pakistan for the period of 2009-2011. The study seeks to know the level of debt specialization in group affiliated firms. If they do; then how are they different from stand-alone firms?

Design/methodology/approach
– The study primarily uses Herfindahl-Hirschman Index and Excl90 as measures of debt specialization, which are further used in cluster, threshold and conditional analysis. Corporate groups are characterized to subsidize their affiliates through internal debt market and loan guarantee. Logistic regression model is used to analyze association among the measures of debt specialization and firm-specific characteristics for group affiliated and stand-alone firms.

Findings
– The results show that about 85 percent firms use more than 50 percent of debt from one debt type. However, group affiliated firms are more inclined toward debt specialization than stand-alone firms. Tangibility and book leverage are negatively and significantly associated to the measures of debt specialization. Moreover, internal debt market and loan guarantee are suggestive reasons of debt specialization in group affiliated firms.

Practical implications
– This study highlights the issue of group affiliation and its significance on firm’s debt structure. It has implications for determination of the optimal financing strategy. In the context of emerging economies, group affiliated firms can create market imperfections as a protection shield. In case of emerging markets, it is recommended to strengthen regulatory mechanism to avoid such market imperfections.

Originality/value
– Prior studies have explored the phenomenon of debt specialization for rated and unrated firms. However, firm group affiliation is widely studied in the context of capital structure. This is a pioneer study to establish and analyze a link between firm group affiliation and debt specialization.
Board governance, intellectual capital and firm performance
Authors: Nkundabanyanga Stephen Korutaro 
Published: April 2016

Purpose
– The purpose of this paper is to examine the relationship between the combined (multiplicative) effect of board governance and intellectual capital (IC) on firm performance.

Design/methodology/approach
– This study is cross-sectional and follows a positivist view of testing pre-specified hypotheses. The study uses a respondent sample of 128 service firms operating in Kampala, directors or managers are the unit of enquiry. Structural equation modelling with analysis of moment structures is used for statistical modelling.

Findings
– Board governance and IC make significant contributions to firm performance. However, their interaction is a significant booster to services sector firms’ performance in Uganda.

Research limitations/implications
– Although an attempt is made at controlling for common method variance in particular by proactive instrument design and testing, and usage of the Harman single factor analytical technique, its influence may not have been dealt away completely owing to failure to obtain a plausible common marker variable. Well, it is meaningful to identify the significant positive multiplicative effects of board governance and IC so as uncover what is needed in service firms to improve their performance.

Originality/value
– Studies explaining firm performance via board governance only and which ignored the synergistic effects of board governance and IC have often missed the reality that the performance of the firm can significantly be improved by means of leveraging IC while simultaneously calling for effective board governance.