Toshihito Shimotani, Yuki Sato and Hajime Igarashi
The purpose of this paper is to propose a fast synthesis method of the equivalent circuits of electromagnetic devices using model order reduction. Finite element method (FEM) has…
Abstract
Purpose
The purpose of this paper is to propose a fast synthesis method of the equivalent circuits of electromagnetic devices using model order reduction. Finite element method (FEM) has been widely used to design electromagnetic devices. For FE analysis of these devices connected to control and deriving circuits, FE equations coupled with the circuit equations have to be solved for many times in their design processes. If the FE models are replaced by equivalent circuit models, computational time could be drastically reduced.
Design/methodology/approach
In the proposed method, a reduced FE model is obtained using proper orthogonal decomposition (POD) in which the size of FE equation is effectively reduced so that the computational time for FE analysis is shortened. Then, the equivalent circuits are directly synthesized from the admittance function of the reduced system.
Findings
Accuracy and computational efficiency of the proposed method are compared with those of another POD-based method in which the equivalent circuits are synthesized from fitting of frequency characteristics using optimization algorithm. There are no significant differences in the accuracy of both methods, while the speedup ratio of the former method is found larger than that for the latter method for the same sampling points.
Originality/value
The equivalent circuits of electric machines and devices have been synthesized on the basis of physical insight of engineers. This paper proposes a novel method by which the equivalent circuits are automatically synthesized from FE model of the electric machines and devices using POD.
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Yuta Morinaga, Yuki Sato, Shohei Hayashi and Tomoyuki Shimanuki
This study aims to examine the impact of managers’ inclusive leadership (IL) on knowledge-sharing (KS) behavior. Additionally, the authors consider the cross-level moderation…
Abstract
Purpose
This study aims to examine the impact of managers’ inclusive leadership (IL) on knowledge-sharing (KS) behavior. Additionally, the authors consider the cross-level moderation effect of diversity in the biological sex of employees on the relationship between IL and employee KS behaviors.
Design/methodology/approach
A two-wave questionnaire survey was conducted in a large Japanese company. The sample included 827 employees (254 men and 573 women) in 129 groups. The authors, then, conducted a cross-level analysis using hierarchical linear modeling (HLM).
Findings
IL promotes two types of KS among employees: knowledge donating (KD) and knowledge collecting (KC). Additionally, the moderating effects of employee biological-sex diversity on the relationship between IL and KS varied according to the KS type. IL had a positive effect on KD only in groups with higher biological-sex diversity, and did not affect groups with lower biological-sex diversity. Biological-sex diversity did not moderate the relationship between IL and KC.
Practical implications
This study has practical implications, especially for personnel departments with high diversity in employees’ biological sex. Further, to improve employees’ KS behaviors, it may be important to develop managers’ IL skills.
Originality/value
This is the first study that explores the relationship between IL and KS and the first to provide evidence of the moderating effect of diversity of employee’s biological sex.
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Hamidreza Harati, Neal M. Ashkanasy and Mahsa Amirzadeh
The purpose of this chapter is to build a new framework for understanding the antecedents of emotional well-being across different psychological states, situations, and cultural…
Abstract
Purpose
The purpose of this chapter is to build a new framework for understanding the antecedents of emotional well-being across different psychological states, situations, and cultural settings. In this regard, we develop propositions regarding causal relationships between self-uncertainty and emotional well-being in the context of social comparison and in two different culture types: dignity and honor.
Design/Methodology/Approach
Based on a literature review, this chapter connects empirical evidence in three areas of research. (1) self-uncertainty literature, (2) emotional well-being, and (3) cross-cultural psychology to propose a new conceptual framework for understanding the relationship between self-uncertainty and well-being across different cultural settings.
Findings
The main finding of this chapter is a model that explains how emotional well-being is comprised of three elements of the psychological state, situation, and culture. We seek to explain how and why different cultures and psychological states might have different effects on human emotions. We propose mediators in order to demonstrate how culturally determined notions of self-construal, self-worth, and social order mediate the relationship between self-uncertainty and emotional well-being.
Research Limitations/Implications
We limited our theorizing to investigate only two broad culture types: honor and dignity. Clearly, there are many more nuances of national culture than this. In addition, our model limited to investigate the role of social comparison among other possible mechanisms to reduce the uncertainty.
Practical Implications
The practical implication of our theory is that it enables leaders to gain a more holistic perspective of emotional well-being in their organizations. In particular, in international organizations, leaders have to pay attention to the cultural background of their employees. This, in turn, enables leaders to understand the antecedents of social comparison and emotional well-being in their employees.
Originality/Value
This chapter proposes a holistic model that explains the simultaneous effects of different psychological states, situations, and cultures.
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Keywords
Takahiro Sato, Yuki Sato and Hajime Igarashi
The finite element method (FEM) for 3D models needs heavy computational cost. The computational cost for FE analysis of moving objects, e.g. Vibration energy harvester, must be…
Abstract
Purpose
The finite element method (FEM) for 3D models needs heavy computational cost. The computational cost for FE analysis of moving objects, e.g. Vibration energy harvester, must be reduced to exploit the simulation of the dynamic system in its design. The paper aims to discuss these issues.
Design/methodology/approach
To reduce the computational time of FEM, the model order reduction (MOR) based on proper orthogonal decomposition has been proposed. For the moving systems, MOR is modified.
Findings
It is shown that proposed MOR makes it possible to drastically reduce the coupling analysis of the energy harvester in which the equations of motion, magnetostatics, and circuit are repeatedly solved.
Originality/value
To reduce the computational time of FEM, block-MOR is presented, in which the whole domain is subdivided into N-blocks. As a result computational cost for MOR can be reduced.
Details
Keywords
Hussam Hussain, Muhammad Kashif Imran, Tehreem Fatima, Ambreen Sarwar and Sobia Shabeer
Based on the conservation of resources and emotional regulation theories, this research seeks to examine the relationship between social rejection and work-deviant behavior with a…
Abstract
Purpose
Based on the conservation of resources and emotional regulation theories, this research seeks to examine the relationship between social rejection and work-deviant behavior with a moderated mediation effect of emotional tolerance and psychological trauma.
Design/methodology/approach
A three-wave multi-sourced (dyad) data were collected from the professionals and respective supervisors of state-managed services sector organizations operating in Pakistan (n1 = 252, n2 = 126) selected through snowball sampling technique.
Findings
The results reflected that socially excluded employees indulge in work-deviant behaviors and psychological trauma perform a partial transmitting link. Further, an ability to be emotionally tolerant buffers the detrimental aspects effects of social rejection on psychological trauma but might not be an effective tool while one moves to the trauma stage. Further, the conditional effect confirms that a high level of emotional tolerance weakens the moderated mediation relationship between social rejection and work-deviant behavior via psychological trauma.
Practical implications
The present study provides guidelines to carefully identify and tackle the incidences of social rejection in the workplace and develop tolerance capabilities of employees to tackle the trauma and reduce work deviance.
Originality/value
This is a novel attempt to link the emotional regulation theory with the conservation of resources theory in order to minimize the deviance-related issues provoked by social rejection by introducing emotional tolerance as a coping mechanism which was paid less attention in the contemporary literature.
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Yoshinobu Sato and Mark E. Parry
Recent discussions of value-in-use from the perspective of service dominant logic have focused on the customer’s determination of value and control of the value creation process…
Abstract
Purpose
Recent discussions of value-in-use from the perspective of service dominant logic have focused on the customer’s determination of value and control of the value creation process. The purpose of this paper is to extend these discussions by exploring the value creation process in the Japanese tea ceremony and in the kaiseki ryori style of Japanese cuisine, which is based on the Japanese tea ceremony.
Design/methodology/approach
A historical analysis is used to describe the history of the Japanese tea ceremony in Japan and its influence on Japanese culture. key principles underlying the Japanese tea ceremony and their relationship to Zen Buddhism are summarized and the ways in which these principles are reflected in the service provided by Japanese restaurants are explored.
Findings
The two elite restaurants examined in this analysis have designed their service experience to reflect four principles of the tea ceremony: the expression of seasonal feelings, the use of everyday items, ritualized social interactions, and the equality of host and guest. Given these principles, we argue that the tea ceremony and restaurants based on this ceremony imply a co-creation process that is different in three important ways from the process discussed in the co-creation literature. First, the tea ceremony involves dual experiential-value-creation processes. Both the master and the customer experience value-in-use during the delivery of kaiseki cuisine, and the value-in-use each receives is critically dependent on that received by the other. Second, the degree to which value-in-use is created for both parties (the customer and the master) depends on the master’s customization of the service experience based on his knowledge of the customer and that customer’s with the tea ceremony, kaiseki ryori cuisine and Japanese culture.
Research limitations/implications
We hypothesize that the dual experiential-value-creation model is potentially relevant whenever the service process contains an element of artistic creation. Potential examples include concerts, recitals, theatre performances and art exhibitions, as well as more mundane situations in which the service provider derives value-in-use from aesthetic appreciations of the service provider’s art.
Originality/value
Recent discussions of value co-creation argue that the customer controls the value creation process and the determination of value. The authors argue that the tea ceremony can serve as a metaphor for value co-creation in service contexts where the customer’s value creation process depends on the creation of value-in-use by the service provider.
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The purpose of this paper is to develop a multi-material topology optimization method for permanent magnet-assisted synchronous reluctance motors.
Abstract
Purpose
The purpose of this paper is to develop a multi-material topology optimization method for permanent magnet-assisted synchronous reluctance motors.
Design/methodology/approach
In the proposed method, the optimization procedure consists of two steps. In the first step, the entire rotor area was selected for the design region and the distribution of the core and air materials was optimized. In the second step, the design region was limited to the air region of the former solution and the distribution of magnets and cores or magnets and air was optimized.
Findings
Because of the two-step process of the proposed method, the design parameters can be reduced compared to the conventional method. As a result, this study can prevent the solution space from becoming more complex and superior solutions can be founded effectively.
Research limitations/implications
Since limited case study is denoted in this paper, much more case studies, for example, three-dimensional optimization problems, are needed to be discussed.
Practical implications
The optimal solutions obtained by the proposed method have a smaller magnet volume and higher average torque than that of the conventional method.
Originality/value
In the proposed methods, optimization methodology, which consists of two-steps process, is differed from the conventional method.
Details
Keywords
Yuki Hidaka, Takahiro Sato, Kota Watanabe and Hajime Igarashi
Conventional level-set method tends to fall into local optima because optimization is conducted based on gradient method. The purpose of this paper is to develop a novel topology…
Abstract
Purpose
Conventional level-set method tends to fall into local optima because optimization is conducted based on gradient method. The purpose of this paper is to develop a novel topology optimization in which simulated annealing (SA) is introduced to overcome the difficulties in level-set method.
Design/methodology/approach
Level-set based topology optimization for two-dimensional optimization problem.
Findings
It is shown in the numerical examples, where conventional and present methods are applied to shape optimization of ferrite inductor and Interior Permanent Magnetic (IPM)-motor, the present method can find solutions with better performance than those obtained by the conventional method.
Originality/value
SA is introduced to improve the search performances of level-set method.
Details
Keywords
Yuki Hattori and Akiyo Nadamoto
The information of social media is not often written in ordinary web pages. Nevertheless, it is difficult to extract such information from social media because such services…
Abstract
Purpose
The information of social media is not often written in ordinary web pages. Nevertheless, it is difficult to extract such information from social media because such services include so much information. Furthermore, various topics are mixed in social media communities. The authors designate such important and unique information related to social media as tip information. In this paper, they aim to propose a method to extract tip information that has been classified by topic from social networking services as a first step in extracting tip information from social media.
Design/methodology/approach
Themes of many kinds exist in a social media community because users write contents freely. Then the authors first detect the topics from the community and cluster the comment based on the topics. Subsequently, they extract tip information from each cluster. In this time, the tip information is include a user's experience and it has common important words.
Findings
The authors used an experiment to confirm that their proposed method can extract appropriate tip information from a community that a user specifies. The average precision is 69 per cent. A comparison of the authors' proposed method and baseline which is without detection of topic and clustering, the average precision obtained using the authors' proposed method is 18 per cent greater than the baseline.
Originality/value
The authors have three points to extract tip information from social media: topic detection and clustering from the social media using LDA method; extracting an author's actual experiences; and creation of a tip keyword dictionary from user experiments.
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Lukas Jürgensmeier, Jan Bischoff and Bernd Skiera
Large digital platforms face intense scrutiny over self-preferencing, which involves a platform provider favoring its own offers over those of competitors. In online marketplaces…
Abstract
Purpose
Large digital platforms face intense scrutiny over self-preferencing, which involves a platform provider favoring its own offers over those of competitors. In online marketplaces, also called retail or e-commerce platforms, much of the academic and regulatory debate focuses on determining whether the marketplace provider gives preference to its own private labels, such as “Amazon Basics” or Walmart’s “Great Value” products. However, we outline, both conceptually and empirically, that self-preferencing can also occur through other dimensions of vertical integration – namely, retailing and fulfillment.
Design/methodology/approach
This article contributes by conceptualizing three dimensions of vertical integration in online marketplaces – private labels, retailing and fulfillment. Then, two studies empirically assess (1) which of the 20 most-visited global online marketplaces vertically integrates which dimension and (2) which share of 600 m available offers is vertically integrated to which degree in eleven international Amazon marketplaces.
Findings
The majority of the leading marketplaces vertically integrate all three dimensions, implying ample opportunities for self-preferencing. Across international Amazon marketplaces, only 0.02% of available offers consist of an Amazon private-label product. However, Amazon is a retailer for around 31% and fulfills around 38% of all available offers in its marketplaces. Hence, self-preferencing on Amazon can occur most frequently through retailing and fulfillment but comparatively infrequently through private-label offers. Still, these shares differ substantially by country – every second offer is vertically integrated in the USA, but only one in ten in India.
Originality/value
Most of the self-preferencing debate often focuses on private-label products. Instead, we present large-scale empirical results showing that self-preferencing on Amazon could occur most often through retailing and fulfillment because these channels affect much larger shares of offers. We also measure the variation of these shares across countries and relate them to regulatory environments.