Search results

The purpose of this paper is to investigate the development process of the fire whirl in the fixed-frame facility and focus on the impacts of the fire whirl’s vortex core on the formation and flame structure of the fire whirl.

The complex turbulent reacting flame surface is captured by the large eddy simulation turbulence closure coupled with two sub-grid scale (SGS) kinetic schemes (i.e. the chemistry equilibrium and steady diffusion flamelet). Numerical predictions are validated thoroughly against the measurements by Lei et al. (2015) with excellent agreements. A double maximum tangential velocity refinement approach is proposed to quantify the vortex cores’ instantaneous location and region, addressing the missing definition in other studies.

The numerical results show that the transition process of the fire whirl is dominated by the vortex core movement, which is related to the centripetal force. The unsteadiness of the fully developed fire whirl was found depending on the instantaneous fluctuation of heat release rate. The steady diffusion flamelet scheme is essential to capture the instantaneous fluctuation. Furthermore, the axial velocity inside the vortex core is the key to determining the state of fire whirl.

Due to intensive interactions between buoyant fires and ambient rotating flow, the on-set and formation of fire whirl still remain largely elusive. This paper focused on the transition process of fire whirl between different development stages. This paper provides insights into the transition process from the inclined flame to the fire whirls based on the centripetal force.

This paper presented and compared two SGS kinetic schemes to resolve the fire whirl development process and the unsteadiness of its vortical structures. The modelling framework addresses the shortcoming of previous numerical studies where RANS turbulence closure and simplified combustion kinetics was adopted. Numerical results also revealed the fire whirl transition process and its relationship to centripetal force.

Shalit and Yitzhaki presented the mean‐extended Gini (MEG) as a workable alternative to the Markowitz mean‐variance approach in 1984. Since then, the challenge has been to extend the MEG approach. The purpose of this paper is to propose a generalization of the MEG approach for making customized optimal asset allocation to control both down‐performance and/or up‐performance.

The MEG approach is used to make strategical allocation tailored to the investor risk aversion and gain propensity measured by characteristic parameters of the extended Gini measures.

The authors set up two optimization problems: the former focused on controlling the risk, the latter on emphasizing the potential gains. Sufficient conditions such that the efficient MEG‐risk frontier coincides with the inefficient MEG‐gain frontier are stated. In the realistic scenarios that portfolios have asymmetrical distributions and/or the investor profile is very conservative or very aggressive, the desirable occurrence that a portfolio is optimal under both optimizations may occur.

The main contribution of this research is to have pointed out that optimal allocation must be tailored to both the investor's risk and gain profile; and, that the optimality may be not preserved if the investor's risk‐gain profile changes. So, the statement “optimal allocation” should be reworded as “optimal allocation personalized to the investor's risk‐aversion and gain‐propensity”.

Online games are popular electronic commerce platforms in which gamers use avatars to interact with others. Avatar identification (the extent to which gamers regard avatars as an extension of themselves) is known to be related to online gamer loyalty. However, few studies have examined how avatars could be designed to enhance avatar identification and online gamer loyalty, indicating a gap. Therefore, the purpose of this paper is to contextualize self-affirmation theory into online gaming contexts, identified key theoretical elements and examined how they are related to avatar identification and online gamer loyalty.

This study surveyed 1,348 massively multi-player online role-playing game players, and their responses were analyzed using structural equation modeling.

The analytical results indicate that irreplaceability within a team and avatar customization are positively related to unique avatar image, while avatar customization is positively related to positive avatar image. Moreover, avatar physical attractiveness and avatar ability to achieve are positively related to positive avatar image. Both unique and positive images of an avatar (as perceived by the user) are positively related to avatar identification, and further to online gamer loyalty.

This study proposes new constructs: irreplaceability within a team, avatar ability to achieve, unique avatar image and positive avatar image. Such new constructs provide insights to aid electronic commerce managers in avatar design, thus instilling gamer identification with avatars, and thus loyalty.

The purpose of this paper is to look inside the “black box” in corporate governance (CG) measurement, and shed some light on how to construct a transparent, reliable and valid index, considering equally both the academics and practitioners’ perspectives.

A synthesized literature review is presented and a CG index is developed combining the strengths of three different methodologies: the Delphi method, the classical test theory (CTT) and the analytic hierarchy process (AHP). This approach helps authors to break the process into separate steps and to select the appropriate techniques to support their decision regarding the norms, the criteria, the variables and the weights that someone should use to construct a CG index.

The authors’ analysis indicates that a well-designed CG index requires a combination of research methods to identify the best options to solve several methodological issues in index construction. For the application of this multi-methodology in Greece, the authors used two equal and independent samples to explore the different perspectives regarding the importance of the index criteria and sub-criteria. This process provides evidence that the opinion of academics and practitioners in Greece tend to converge. Moreover, it is found that this multi-methodology produces the highest variation in CG scores and ranking orders, as opposed to a traditional approach, in measuring CG disclosure, an important issue with econometric implications.

The limitations of this study are associated with the methods used.

This paper provides practical implications for investors and commercial vendors. For the former, it highlights the need to be more cautious and/or suspicious when they use CG ratings, meaning that they should comprehend the base of the ratings models, and for the latter, it demonstrates the importance of enhancing the transparency in CG indices construction.

The value of the paper lies in improved understanding of the methodological issues in constructing CG indices. This is quite interesting because this approach could serve as a roadmap for other researchers.

The purpose of this paper is to apply Maslow's hierarchy of needs to extend the expectation‐confirmation model of information systems continuance (ECM‐IS) to analyze users' continuance intention of social networking services (SNSs).

A survey is conducted on 202 users of social networking services in China.

Fulfillment of self‐actualization needs has a significant impact on continuance intention; however, the direct impact of fulfillment of social needs on continuance intention is not significant but fully mediated by satisfaction.

The first limitation is that the participants in the sample are undergraduates. Second, this study has used cross‐sectional survey data to empirically test the model. Third, the survey is conducted in a single country.

The results of this paper provide several marketing implications to better manage SNSs. First, SNS managers should enhance instant communication functions, develop a platform that is convenient for users to express themselves and provide more entertainment functions. Second, SNS managers should focus on users' expectations and experiences about website functions and adjust or update website functions accordingly.

This paper contributes to the research on continuance intention of social networking services from the perspective of Maslow's hierarchy of needs to capture motivations of continuance intention. The authors believe their conceptualizations of fulfillment of self‐actualization needs and fulfillment of social needs, as well as their substantial findings, would be useful to researchers and practitioners alike to better study and manage continuance intention of socially‐oriented online services.

A construction project typically involves many participants such as owners, consultants, contractors, subcontractors and suppliers. It is important for them to have harmonious relationships so that the project can be completed expeditiously. Trust is a critical factor to maintain harmonious relationships. The purpose of this paper is to investigate the ingredients to bring about trust in construction project teams in Vietnam. The specific objectives were to investigate the existence of personal trust, explore relationship between trust and project outcomes, and identify attributes that help to improve trust.

This research employed questionnaire survey as the research method and collected data via face‐to‐face and e‐mail interviews. The sample comprised randomly selected construction practitioners in Vietnam. Data were analyzed using the SPSS software.

The results showed that trust exists between members of construction project team members in Vietnam. It was found that trust can leverage project quality and client satisfaction. In this regard, a number of factors were found to be significantly important to the development of trust.

The sample size was relatively small.

When operating in Vietnam, practitioners should adopt a long‐term mindset so as to develop trust. They should also select partners who have good reputations as these are more trustworthy.

This study contributes to knowledge by showing that trust exists between individuals participating in construction projects in Vietnam and it leads to higher output quality and client satisfaction. Unique attributes to increase trust in Vietnam were also uncovered.

The purpose of this paper is to examine the effect of related party transactions (RPTs) and types of RPTs (complex, simple and loan) on earnings quality in four East Asian countries: Hong Kong, Malaysia, Singapore and Thailand.

RPTs and types of RPTs are measured using two approaches, magnitude and abnormal (magnitude change). Earnings quality is measured using proxies for accrual earnings management and identified as discretionary accruals (DAC) and performance matched discretional accruals (PMDAC).

The results suggest that firms in these countries experience poor earnings quality when they are engaged in RPT. The effect of RPT-simple on earnings quality is more severe than RPT-complex. However, the presence of higher investor protection and stricter enforcement of regulations in countries like Singapore and Hong Kong reduce the negative impact of RPTs on earnings quality.

The results support the argument that the presence of controlling shareholders in East Asia is likely to lead to engagement with RPTs, which will increase the likelihood of firms’ earnings manipulation via DAC. This study has two limitations. It only focuses on Hong Kong, Malaysia, Singapore and Thailand, and the results may not be generalizable to other countries. Second, this study only measures the magnitude and abnormal RPTs based on the disclosures available in annual reports.

This paper contributes to the literature by examining the effect of RPTs and types of RPTs on earnings quality in four selected East Asian countries. 

Metasearch engines (MSEs) which have been designed to solve problems of internet users in finding relevant resources are not seemingly as recognized as the other web search tools such as search engines (SEs) and directories. As a result, this paper aims to compare and evaluate some of them in terms of search features included in their interface so that users can be familiar with these search tools.

This research compares and evaluates 20 general MSEs in English, which are free of charge, based on a researcher‐made checklist. Finally, those MSEs which have better search features have been introduced.

According to results obtained, it is self‐evident that most MSEs offer an excellent alternative for users.

MSEs which have great features and high facilities are not necessarily user‐friendly. So, usability studies or user‐oriented ones on MSEs seem to be required.

Hopefully, these findings help users choose and make use of an MSE, MSE developers design more efficient and effective ones and information professionals identify and retrieve high relevant documents, meeting their information needs.

This paper provides clear and relatively comprehensive descriptive evidence for evaluating search facilities and potentials of MSEs which are commonly used by internet users today.

The purpose of this paper is to examine trust relationships in managing construction projects to determine the trust situations, the psychological perception of trust relationship, and the underlying value of trust. Association is made to project management, project team and strategy implementation for managing construction projects.

A case study approach is adopted to collect qualitative data from ten projects. The collected data are analysed with content analysis and discussed with a flow model and interactive model approach.

Using the real‐life evidence, the findings revealed a diversified meaning of trust, which subsequently confirm the multi‐faceted nature of trust with qualitative data analysis.

Further research is necessary for multi‐party working as this working style dominates the construction industry and greatly affects the overall project performance, and the effect of such is particularly obvious when managing differences among people. For a better understanding of trust, the moral and social dimensions of trust need to be studied separately.

The study offers a direction for implementation of relational contracting in project management, project teamwork and strategy implementation. Implications in practice include: project management – time, cost and quality are greatly affected by people implementation and therefore a balance of control and trust is required; project team – trust needs to be cultivated with rules and norms in a multi‐party working team because trust is not self‐generated; and strategy implementation – both interpersonal and inter‐firm trust have to be considered, particularly at the middle management level.

The paper is of value to both practitioners and academics/researchers in the management development of construction projects by providing a different perspective from the human side.

The purpose of the paper is to examine the impact of corporate governance mechanisms, i.e. board structure and ownership structure on the underpricing of small and medium enterprises (SME) IPOs in India.

Most of the extant empirical research studies have either pivoted on mainstream IPOs or SMEs IPOs in developed economies, but the present study examines 200 SME IPOs issued during Feb 2012 to April 2017. Multiple regressions have been used to examine the impact of the corporate governance mechanisms on raw return (RR). Furthermore, robustness of the results has been verified through the employment of market-adjusted excess return (MAER) as an additional proxy of underpricing.

The results highlight that board size, inverse of board committees, board independence, board age, board directorships positively, and top ten shareholding negatively influence RR. Further, direction of promoter ownership variable indicates curvilinear relationship with underpricing. Other explanatory variables used in model lack statistical validity. Similar results have been obtained when variables were regressed against MAER with related board members being additionally significant in model.

The findings suggest that Indian investors do take cues from board structure and ownership patterns for making investment decisions in small- and medium-sized firms. Further, the results are also helpful to top management in structuring their boards.

The present research enriches SME IPOs underpricing literature because the impact of corporate governance mechanisms on unadjusted returns is relatively under explored particularly within the context of small- and medium-sized firms.