bluuebunny/crossref_metadata_2025_split huggingface dataset:
Calculation of inrush current using adopted parameters of the hysteresis loop
Authors: Ali Naghizadeh Ramezan , Vahidi Behrooz , Hossein Hosseinian Seyed 
Published: November 2014

Purpose
– The purpose of this paper is to propose an accurate model for simulation of inrush current in power transformers with taking into account the magnetic core structure and hysteresis phenomenon. Determination of the required model parameters and generalization of the obtained parameters to be used in different conditions with acceptable accuracy is the secondary purpose of this work.

Design/methodology/approach
– The duality transformation is used to construct the transformer model based on its topology. The inverse Jiles-Atherton hysteresis model is used to represent the magnetic core behavior. Measured inrush waveforms of a laboratory test power transformer are used to calculate a fitness function which is defined by comparing the measured and simulated currents. This fitness function is minimized by particle swarm optimization algorithm which calculates the optimal model parameters.

Findings
– An analytical and simple approach is proposed to generalize the obtained parameters from one inrush current measurement for simulation of this phenomenon in different situations. The measurement results verify the accuracy of the proposed method. The developed model with the determined parameters can be used for accurate simulation of inrush current transient in power transformers.

Originality/value
– A general and flexible topology-based model is developed in PSCAD/EMTDC software to represent the transformer behavior in inrush situation. The hysteresis model parameters which are obtained from one inrush current waveform are generalized using the structure parameters, switching angle, and residual flux for accurate simulation of this phenomenon in different conditions.
DC-link voltage selection for a multi-MW wind turbine
Authors: Roshanfekr Poopak , Thiringer Torbjörn , Lundmark Sonja , Alatalo Mikael 
Published: November 2014

Purpose
– The purpose of this paper is to investigate how the dc-link voltage for the converter of a wind generator should be selected, i.e. to determine the losses in the generator and the converter when using various dc-link voltage levels.

Design/methodology/approach
– To presents the efficiency evaluation of 5 MW wind turbine generating systems, two 5 MW surface mounted permanent magnet synchronous generators (PMSG) with medium and low rated voltage is designed. A two-level transistor converter is considered for ac/dc conversion. Three different dc-link voltage levels are used. By using these voltage levels the PMSG is utilized in slightly different ways.

Findings
– It is found that the system with the lower voltage machine has slightly higher annual energy efficiency compare to the higher voltage system. Furthermore, it is shown that the best choice for the dc-link voltage level is a voltage between the minimum voltage which gives the desired torque and the voltage which gives Maximum Torque Per Ampere.

Originality/value
– A procedure as well as investigations with quantified results on how to find the highest complete drive system efficiency for a wind turbine application. Based on two given PMSG, the most energy-efficient dc-link voltage has been established.
High-order fast integration for earth-return impedance between underground and overhead conductors in Matlab
Authors: Ma Junjie , Xiang Shuhuang 
Published: November 2014

Purpose
– The earth-return mutual impedances between underground and overhead conductors can be expressed by Pollaczek integrals. Many efforts have been exerted to calculating this kind of integrals. However, most of numerical methods turn out to be time-consuming as integrands become highly oscillatory and strongly singular. Therefore, efficient algorithms should be devised. The paper aims to discuss these issues.

Design/methodology/approach
– The paper separates the singularity from the whole integral and couple with the singularity and oscillation, respectively. A sinh transformation is applied for the finite part and complex integration method is used to calculate the tail.

Findings
– Numerical experiments show that the given method shares the property that the stronger the singularity and the higher the oscillation, the better the accuracy of the calculation.

Originality/value
– The sinh transformation is first proposed to calculate Pollaczek integrals. This efficient algorithm can be used to evaluate mutual impedances between conductors. Also, it provides a new aspect of the research on fast calculation of Pollaczek integrals and Sommerfeld integrals.
The emerging cannabis treatment population
Authors: Hamilton Ian , Lloyd Charlie , Monaghan Mark , Paton Kirsteen 
Published: November 2014

Purpose
– The purpose of this paper is to examine recent trends in presentation to treatment where cannabis is identified as the primary drug.

Design/methodology/approach
– Data is drawn from the recently published Public Health England report and supplemented with Home Office and European data.

Findings
– The data shows a marked increase in presentations for cannabis treatment over recent years. The authors offer some potential explanations for this trend.

Research limitations/implications
– The authors need to improve our understanding of the type of cannabis that is available and how specifically it is used. In parallel there is a pressing need for an evaluation of evidence in relation to treatment for problematic cannabis users.

Originality/value
– This paper highlights this recent trend in treatment presentations, offers some potential explanations and makes associated recommendations.
An empirical study of the complexity of requirements management in construction projects
Authors: Karim Jallow Abdou , Demian Peter , N. Baldwin Andrew , Anumba Chimay 
Published: November 2014

Purpose
– The purpose of this paper is to investigate in-depth the current approach of managing client requirements in construction and to highlight the significant factors, which contribute to the complexity of managing the requirements in order to define a better approach.

Design/methodology/approach
– A case study of a leading international global built asset and engineering consultancy organization was conducted over two years. The case study was conducted principally using semi-participant observations supplemented with other qualitative data collection methods (i.e. interviews, questionnaires and document analysis). Thematic analysis was used to analyze the data.

Findings
– The results highlight major factors associated with the complexity of managing client requirements information, which include: mechanisms for documentation, storage and access, distribution of requirements information between stakeholders and across lifecycle phases of a project, traceability management and the provision of effective change management incorporating dependency checking and impact analysis.

Research limitations/implications
– The main limitation of the research is the use of an in-depth study of a single organization, which applied the same project management method across all the projects they managed. Further work is planned to develop the proposed framework fully, and develop a software platform to operationalize and evaluate its industrial applicability with construction projects.

Practical implications
– The implications of this research is that a better approach to managing requirements information is needed, which will facilitate the design, construction and operations of buildings within budget and time. An integrated framework and an associated tool are suggested to implement the approach.

Originality/value
– This study identifies major research gaps and problems in the architecture, engineering, construction and facilities management industry; proposes and presents Electronic Requirements Information Management framework to facilitate lifecycle management of the requirements.
Farming the “white gold” in a world heritage city
Authors: Siti-Nabiha A.K. , Jalaludin Dayana , Ahmed Hasan 
Published: November 2014

Subject area
Public management, sustainability.

Study level/applicability
The case is suitable for undergraduate and masters' courses.

Case overview
The case is about the dilemma between the lucrative economic profit from swiftlet farming and the invaluable heritage and social wellbeing of the residents in a world heritage city. In 2011, the United Nations Educational, Scientific and Cultural Organization (UNESCO) issued a letter to the Malaysian government expressing concern over the issue of the swiftlet industry in Georgetown, Penang. Swiftlet farming is a lucrative agriculture sector in Malaysia and is considered one of the key projects under the Malaysian Economic Transformation Program. Yet, this industry posed a threat to the well being of George Town due to its impact towards the city's heritage status. The operation of swiftlet farms in shop houses in George Town not only forces residents to coexist with thousands of swiftlets in the populated city, but also deteriorates the condition of its heritage buildings. A quick solution by the government authorities is needed in order to respond to UNESCO's enquiries. A fair consideration looking at the aspects of economy, environment and society is vital in ensuring the future of the city.

Expected learning outcomes
These include: understanding the complex issues of trade-offs between economic profit vis-à-vis the environmental social heritage; understanding and appreciating the conflicting governmental objectives and the way to address the conflicting demands of the stakeholders (NGOs, industry and business association and the general public); identifying and determining ways to align environmental interests with economic interests in order to formulate sustainable solutions; and formulating an action plan and providing practical recommendations to solve the problem.

Supplementary materials
Teaching notes are available for educators only. Please contact your library to gain login details or email support@emeraldinsight.com to request teaching notes.
Employing CSR in SME development to survive Arab Spring fluctuations – the case of Egypt: General Authority for Investment (GAFI)
Authors: Aziz Hadia Hamdy Abdel , Darrag Menatallah 
Published: November 2014

Subject area
Business ethics, sustainability and economic development.

Study level/applicability
This case is suitable for both advanced undergraduate and postgraduate levels.

Case overview
The case presents a pioneering initiative run by the Egyptian General Authority for Investment (GAFI) to mitigate the implications of the 25th of January revolution on SMEs. The case describes the “Business Clinic” program that was designed to provide SMEs with world class consultancy services through the CSR programs of large local and multinational consultancy firms.

Expected learning outcomes
The case should help students in: defining corporate social responsibility and describing its importance; describing the role of SMEs in economic development; identifying the different growth obstacles that face SMEs; relating theories in different managerial fields that could be linked to CSR and development; investigating the Arab Spring and describing its repercussions on economic development and sustainability; and illustrating CSR role in solving SME problems.

Supplementary materials
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Sustainability as an imperative and an opportunity: the case of Infosys Limited
Authors: Mathew Saji K. , Rajan Thillai 
Published: November 2014

Subject area
This case provides useful material for discussion on topics such as sustainability, business continuity, corporate social responsibility and green IT.

Study level/applicability
The case could be used in different areas of business management such as general management, information systems and business strategy.

Case overview
The case presents the progressive evolution of Infosys Limited from its beginnings through different stages of innovation and consolidation in the IT services industry. Senior executives at Infosys believe that the sustainability initiative at Infosys is not a new movement, but a logical extension of the company's long standing commitment to society and environment. Sustainability was a key agenda at Infosys and it was deeply ingrained in the company's ethos and the way in which it operated. The case also articulates the company's commitment to sustainability as evidenced by the involvement of the top management in providing leadership. From an academic standpoint the case provides pointers to look at how the IT services industry has responded to sustainability practices and how sustainability practices are different or similar across various firms.

Expected learning outcomes
The case can help students to answer the following questions: How is sustainability different from corporate social responsibility? What is the context in which Infosys' attention turned towards sustainability? How is top management involved in Infosys' sustainability initiative? What are the elements of Infosys' sustainability strategy? How does it build on its core strengths? What are the structural mechanisms the company has provided to implement its sustainability strategy? What internal challenges to change while implementing green solutions were foreseen and overcome by Infosys? How competitive is Infosys' sustainability practices with respect to its competitors? How does it help the company in competing in the market?

Supplementary materials
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“Eldorado” family: the survival and succession plan
Authors: Perdomo Sandra Jennina Sanchez , Puertas Mario Andres Manzi 
Published: November 2014

Subject area
Entrepreneurship and family business.

Study level/applicability
The case is suitable for BA and MBA levels and for courses focusing on family businesses, entrepreneurship, or small and medium-sized enterprises.

Case overview
The Gomez family is the owner of Colchones Eldorado, a Colombian mattress company, in business for more than 50 years. Its founder and CEO Gumercindo Gomez, 75 years old, had no succession plan but he wanted to ensure the future of his business. Given the urgency of this situation and the complexity of the family structure, Martha Gomez, General Manager, hired a consultant to design the succession plan. To prepare this plan, the consultant must take into account: the preservation of stock ownership within the family, the company's sustainability under the new CEO family member, and the assurance of the family harmony.

Expected learning outcomes
These include: understanding the characteristics of a family business in the Latin American context; recognizing the stages of the family ownership; and identifying personal characteristics and roles of family members in order to design the basis of the succession plan.

Supplementary materials
Teaching notes are available for educators only. Please contact your library to gain login details or email support@emeraldinsight.com to request teaching notes.
World is classroom: the case of Univexcellence.com
Authors: Rao A. Srinivasa 
Published: November 2014

Subject area
Entrepreneurship.

Study level/applicability
The case can be taught for students at the Master's level and research scholars in management education.

Case overview
Univexcellence was an idea conceived by Surbhi from her science project in 1997 when she was studying at Kendriya Vidyalaya, Jaipur, India. The science project model was based on the theme “World is a classroom, room is university”. It was shown that the world would be converted into a room, and the room itself would become a University through satellite communication. Surbhi decided to become a computer engineer and learn about it herself so as to become self-dependent as a business woman. Keeping this in mind, she completed a computer engineering course. A strong sense of efficacy enhances human accomplishment and personal well-being in many ways. Surbhi has proved it in her case.

Expected learning outcomes
The case describes challenges and setbacks faced by a woman entrepreneur and through her self-confidence and persistence, illustrate show she solved them to the benefit of her business.

Supplementary materials
Teaching notes are available for educators only. Please contact your library to gain login details or e-mail support@emeraldinsight.com to request teaching notes.
External entrepreneurs/investors andguanxi: hostels in a tourism area, Xinjiang, China
Authors: Yang Jingjing , Ryan Chris , Zhang Lingyun 
Published: November 2014

Purpose– This research aims to explore how outsider entrepreneurs maintain harmoniousguanxiwith stakeholders (especially the government) in an ethnic minority area of less-developed western China.Design/methodology/approach– This paper is derived from an ethnographic study undertaken by the first author who lived for 12 consecutive months in the case area.Findings– This research indicates that outsider entrepreneurs need to balance between standards required by industry associations and sound “guanxi”, between bureaucratic arrangements and business practice, between economic profit and lifestyle within aguanxi-dominated society. It may be argued that the continuance of relationships represents the continuance of resources and benefits and the maintenance of social and political capital.Practical implications– One issue in the relationship with local governments is the question to what degree politicians can influence enterprises’ business? Politicalguanxiis thus an important key to any understanding of the local political scene. In China, the Chinese philosophy thatHarmony is the most preciousis a strategy often adopted in mediation and operation.Originality/value– Factors includingguanxi, entrepreneurs’ operation motivations, government-directed political system, indigenous people and culture and Butler’s tourism area life cycle (TALC) model are considered in the discussion. This study expands the knowledge pertaining to hostels in China in relation to their interaction with local governments and locals to maintain a goodguanxi. It highlights the multiple dimensions ofguanxiin terms of micro-and macro-perspectives with reference to functionality and cultural requirements.
INS/GPS fusion architectures for unmanned aerial vehicles
Authors: Ailneni Sanketh , K. Kashyap Sudesh , Shantha Kumar N. 
Published: November 2014

Purpose– The purpose of this paper is to present fusion of inertial navigation system (INS) and global positioning system (GPS) for estimating position, velocities, attitude and heading of an unmanned aerial vehicle (UAV).Design/methodology/approach– A 15-state extended Kalman filter (EKF) and a split architecture consisting of six-state nonlinear complementary filter (NCF) and nine-state EKF are investigated in detail. In both these fusion architectures GPS and inertial measurement unit consisting of three axis accelerometers, three axis rate gyros and three axis magnetometer have been fused in open loop fashion (loosely coupled) to estimate the navigation states.Findings– These architectures have been implemented in MATLAB/SIMULINK environment and evaluated in closed loop guidance of Black-Kite MAV with software-in-the-loop-simulation (SILS) setup. Furthermore, both the algorithms are validated with flight test data obtained from on-board data logger using an off-the shelf autopilot board (Ardupilot Mega APM-2.5) on SLYBIRD UAV.Originality/value– The proposed architectures are of high value to accomplish INS/GPS fusion, which plays a vital role in autonomous guidance and navigation of an UAV.
Occupational mobility over the business cycle
Authors: Roosaar Liis , Mõtsmees Pille , Varblane Urmas 
Published: November 2014

Purpose– The purpose of this paper is to examine how occupational mobility varies over the business cycle and how selected factors contribute to occupational mobility in different stages of the business cycle.Design/methodology/approach– Using annual micro data from the Estonian Labour Force Survey (2001-2010) and implementing probit models with interaction terms, the paper investigates occupational mobility as a change of occupation in two successive years during recovery, boom and recession periods.Findings– The analysis indicates that occupational mobility is higher during the recovery and boom periods and lower during the recession stage. The demographic characteristics (gender, marital status, knowledge of local language) influence the probability for occupational change during the recovery stage of the business cycle. The position of employees in the occupational hierarchy is significant during the recovery and boom periods. Employees working in the public sector have a lower probability for occupational change compared with private sector employees during the recession. Training has a positive effect on occupational mobility during recession. Tenure reduces the probability of occupational mobility over the whole business cycle.Originality/value– The paper contributes to the literature by providing new results about the role of different factors of occupational mobility over the business cycle. This is among the few studies addressing the variation in the occupational mobility of employees from the public and private sectors. Interactions between the position of the employees in the occupational hierarchy and the ownership form of their employers and the economic sectors add to the understanding about the mechanism of occupational mobility over the business cycle stages.
Human smuggling and violence in the east Mediterranean
Authors: Baird Theodore 
Published: November 2014

Purpose
– The purpose of this paper is to outline a typology of violent acts used against migrants using human smugglers. This paper relates the experiences of violence, coercion, and exploitation to migrants’ experiences of being smuggled across borders.

Design/methodology/approach
– Data were collected using participant observation and semi-structured interviews among undocumented migrants and refugees who used human smugglers to enter Turkey and Greece. Fieldwork was conducted in Athens, Greece and Istanbul, Turkey over spring and summer 2011 and 2012.

Findings
– This paper presents an adapted typology of violence using four categories of coercive violence: threats and pressure, physical force, deception and fraud, and coercion/advantage taking. Movement with human smugglers may involve the violation of consent and forms of exploitation resembling, but not equating to, human trafficking.

Research limitations/implications
– The findings are based on a non-probability snowball sample, and are not generalizable. Further research should engage with other methods such as respondent driven sampling to gain more accurate estimates of violent events among smuggled migrants.

Practical implications
– Governments must respond appropriately when apprehending or detaining migrants, as many of them have been victimized by violence and may remain vulnerable because of continued threats from human smugglers.

Originality/value
– This paper presents a typology of violent acts against migrants using human smugglers, and can be used to develop further research and improve professional practice.