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1.Identifying the influential spreaders in multilayer interactions of online social networks

Author:Al-Garadi, MA;Varathan, KD;Ravana, SD;Ahmed, E;Chang, V


Abstract:Online social networks (OSNs) portray a multi-layer of interactions through which users become a friend, information is propagated, ideas are shared, and interaction is constructed within an OSN. Identifying the most influential spreaders in a network is a significant step towards improving the use of existing resources to speed up the spread of information for application such as viral marketing or hindering the spread of information for application like virus blocking and rumor restraint. Users communications facilitated by OSNs could confront the temporal and spatial limitations of traditional communications in an exceptional way, thereby presenting new layers of social interactions, which coincides and collaborates with current interaction layers to redefine the multiplex OSN. In this paper, the effects of different topological network structure on influential spreaders identification are investigated. The results analysis concluded that improving the accuracy of influential spreaders identification in OSNs is not only by improving identification algorithms but also by developing a network topology that represents the information diffusion well. Moreover, in this paper a topological representation for an OSN is proposed which takes into accounts both multilayers interactions as well as overlaying links as weight. The measurement results are found to be more reliable when the identification algorithms are applied to proposed topological representation compared when these algorithms are applied to single layer representations.

2.Exploring a curriculum app and a social communication app for EFL learning

Author:Zou, B;Li, H;Li, JY


Abstract:Mobile apps are broadly used by students in and after class to improve their language skills. This study aimed to investigate how a curriculum app and a social communication app can be integrated into English language teaching and learning and what sorts of tasks can be employed to enhance learners' EFL learning. A curriculum app was created by the researchers and integrated into English teaching and learning in and out of class. Meanwhile, a social communication app used on mobile phones was also established for communication between students and the teacher. Questionnaires and interviews were conducted so as to explore students' perceptions of these apps. The findings indicated that mobile learning can be adapted in EFL lessons and learners' self-study. The apps providing sources connected to lessons and opportunities for communication offered additional support to students to practice English in and after class. Participants provided positive comments on the two apps for mobile learning.

3.The dual effects of home country institutions on the internationalization of private firms in emerging markets Evidence from China

Author:Li, FR;Ding, D


Abstract:Purpose - This study aims to examine the dual effects of home country institutional forces (i.e. institutional support and institutional constraints) on the internationalization of private firms in emerging markets. By doing so, this study aims to examine the applicability of the two seemingly paradoxical views (i.e. the governmental promotion view and the institutional escapism view) in explaining private firms' internationalization. Further, this study investigates how the effect of the home country institutional environment on firms' internationalization is contingent upon firm characteristics. Design/methodology/approach - A sample of Chinese private firms is used to examine the effect of home country institutions on internationalization. Findings - Empirical findings suggest that both institutional support and institutional constraints promote the internationalization of private firms in emerging markets. Moreover, it is found that firm resources strengthen the effect of government support on internationalization. It is also found that firms' business ties strengthen the effect of institutional constraint on internationalization, whereas firms' political ties weaken the effect of institutional constraints on internationalization. Originality/value - By adopting an integrated and comprehensive investigation of the dual effects of home country institutional environment in emerging markets on internationalization, this study provides evidence to the applicability of the two competing views (i.e. the governmental promotion view and the institutional escapism view) in relation to home country institutional effects on internationalization. In addition, this study examines how institutional effects vary across firms with different resources and social ties, thus extends understandings of the boundary conditions of the two institutional effects.

4.Valuation Bounds on Barrier Options Under Model Uncertainty

Author:Hong, Y


Abstract:This article investigates valuation bounds on barrier options under model uncertainty. This investigation enriches the literature on the model-free valuation of these exotic options. It is found that with weak assumptions on underlying price processes, tight valuation bounds on barrier options can be sought from a set of European options. As a result, the numerical routine developed in this article can be reviewed as a new method for the evaluation of barrier options, which is independent of model assumptions. (c) 2012 Wiley Periodicals, Inc. Jrl Fut Mark 33:199234, 2013


Author:Freire, T


Abstract:In 1978, Singapore became the first country to introduce legislation allowing foreign domestic workers to work in the country under special visas. Although Singapore is often cited in the literature as a success story, no studies have quantified the impact of this legislation. In this paper, we use data derived from the Singapore Yearbook of Manpower Statistics between 1974 and 1985 to determine the influence of the 1978 legislation on the labor supply of Singaporean women. We find that the labor supply of women affected by this policy increased by between 3.1%% and 6.2%%.

6.A novel cluster HAR-type model for forecasting realized volatility

Author:Yao, XZ;Izzeldin, M;Li, ZX


Abstract:This paper proposes a cluster HAR-type model that adopts the hierarchical clustering technique to form the cascade of heterogeneous volatility components. In contrast to the conventional HAR-type models, the proposed cluster models are based on the relevant lagged volatilities selected by the cluster group Lasso. Our simulation evidence suggests that the cluster group Lasso dominates other alternatives in terms of variable screening and that the cluster HAR serves as the top performer in forecasting the future realized volatility. The forecasting superiority of the cluster models are also demonstrated in an empirical application where the highest forecasting accuracy tends to be achieved by separating the jumps from the continuous sample path volatility process. (C) 2019 International Institute of Forecasters. Published by Elsevier B.V. All rights reserved.

7.Is the incipient Chinese civil society playing a role in regenerating historic urban areas? Evidence from Nanjing, Suzhou and Shanghai

Author:Verdini, G


Abstract:Urban regeneration in Western countries can count on a long-lasting tradition of experiences in which civil society has played a fundamental role in counterbalancing the system of power, resulting in profound urban governance readjustments. This has been the result of the increasing centrality of horizontal alliances between citizens and associations involved in urban affairs since the late 1960s in the West. Similar theoretical frameworks have been applied in China. However, these have frequently resulted in conceptual shortcuts that depict civil society as immature or lacking and the state as authoritarian. This paper will explore whether these categories are still entirely valid to urban regeneration in China. While the regime has traditionally prevented horizontal linkages of associations in urban governance (supporting their vertical integration to ensure a certain degree of soft control), there are signs of change. In particular, three cases of urban regeneration in historic areas will be used to discuss the changing role played by civil society in China. The ultimate goal is to examine whether horizontal linkages across groups of heterogeneous citizens are arising at the micro-level of urban governance. (C) 2015 Elsevier Ltd. All rights reserved.

8.Modelling conditional moments and correlation with the continuous hidden-threshold-skew-normal distribution

Author:Belhachemi, R;Rostan, P;Racicot, FE

Source:APPLIED ECONOMICS,2015,Vol.47

Abstract:A key issue in modelling conditional densities of returns of financial assets is the time-variation of conditional volatility. The classic econometric approach models volatility of returns with the generalized autoregressive conditional heteroscedasticity (GARCH) models where the conditional mean and the conditional volatility depend only on historical prices. We propose a new family of distributions in which the conditional distribution depends on a latent continuous factor with a continuum of states. The distribution has an interpretation in terms of a mixture distribution with time-varying mixing probabilities. The distribution parameters have economic interpretations in terms of conditional volatilities and correlations of the returns with the hidden continuous state. We show empirically that this distribution outperforms its main competitor, the mixed normal conditional distribution, in terms of capturing the stylized facts known for stock returns, namely, volatility clustering, leverage effect, skewness, kurtosis and regime dependence.

10.Chinese EFL academics' perceptions of research quality: a phenomenological study

Author:Xie, JM;Postlethwaite, K


Abstract:This paper explores how Chinese academics, working in the field of English as Foreign Language Education in universities in China, conceptualise research quality. The paper uses a phenomenological approach and four qualitative methods (survey, interview, focus groups and document analysis) to investigate what a sample of these scholars perceive as high-quality research. We found that the participants viewed quality through various lenses and identified several different criteria. We categorised their elaboration of the criteria under three headings: methodology, contextualisation and impact. The participants nominated many general criteria that were similar to western standards of research quality, especially in relation to methodology; however, some contextual criteria were specific to the Chinese context. The paper indicates that there is much in the university research community that could be altered to enable people who are directly involved in research to disseminate their criteria for research quality, and potentially to affect and develop the quality of educational research in the Chinese context, and/or elsewhere.

11.Privacy perception and protection on Chinese social media: a case study of WeChat

Author:Chen, ZT;Cheung, M


Abstract:In this study, the under-examined area of privacy perception and protection on Chinese social media is investigated. The prevalence of digital technology shapes the social, political and cultural aspects of the lives of urban young adults. The influential Chinese social media platform WeChat is taken as a case study, and the ease of connection, communication and transaction combined with issues of commercialisation and surveillance are discussed in the framework of the privacy paradox. Protective behaviour and tactics are examined through different perceptions of privacy in the digital age. The findings of this study suggest that users possess certain amount of freedoms on WeChat. However, users' individual privacy attitudes and behaviour in practice suggest they have a declined sense of their own freedom and right to privacy. A privacy paradox exists when users, while holding a high level of concerns, in reality do little to further the protection of their personal information on WeChat. We argue that once a user has ingrained part of their social engagement within the WeChat system, the incentive for them to remain a part of the system outweighs their requirement to secure their privacy online as their decision-making is largely based on a simple cost-benefit analysis. The power and social capital yielded via WeChat is too valuable to give up as WeChat is widely used not only for private conversations, but also for study or work-related purposes. It further blurs the boundaries between the public, the professional and the private, which is a rather unique case compared with other social media around the world.

12.The spatial characteristics of global property investment in Seoul: A case study of the office market

Author:Kim, HM;O'Connor, KB;Han, SS


Abstract:As more and more countries liberalise their financial systems, capital has become increasingly mobile. These emerging capital flows and the accumulation of capital are mainly embodied in foreign direct investment. A new component is global property investment which is creating an internationalised office market and distinctive spatial patterns in global cities. Despite the increasing volume of foreign-owned property, as well as the popularity of the facilitating policies for cross-border capital flows into real estate, in both developed and developing countries, there has been little attention to the spatial characteristics of global property investment (GPI). Massive cross-border capital flows, associated with the decision of international property investors, will result in locally intensive changes. Understanding these changes will allow advice to refine and enhance sectoral and urban policy. The primary purpose of this study is, therefore, to explore the characteristics of GPI via the magnitude of the flows, global investors' location choice, links between property markets and office space markets, and government response to these outcomes. Seoul is used as case study because there is a fast growing foreign-owned office property sector along with city's growing integration with the global economy. (C) 2014 Elsevier Ltd. All rights reserved.

13.Multimedia augmented m-learning Issues, trends and open challenges

Author:Yousafzai, Abdullah ; Chang, Victor ; Gani, Abdullah ; Noor, Rafidah Md

Source:International Journal of Information Management,2016,Vol.36

Abstract:The advancement in mobile technology and the introduction of cloud computing systems enable the use of educational materials on mobile devices for a location- and time-agnostic learning process. These educational materials are delivered in the form of data and compute-intensive multimedia-enabled learning objects. Given these constraints, the desired objective of mobile learning (m-learning) may not be achieved. Accordingly, a number of m-learning systems are being developed by the industry and academia to transform society into a pervasive educational institute. However, no guideline on the technical issues concerning the m-learning environment is available. In this study, we present a taxonomy of such technical issues that can impede the life cycle of multimedia-enabled m-learning applications. The taxonomy is devised based on the issues related to mobile device heterogeneity, network performance, content heterogeneity, content delivery, and user expectation. These issues are discussed, along with their causes and measures, to achieve solutions. Furthermore, we identify several trending areas through which the adaptability and acceptability of multimedia-enabled m-learning platforms can be increased. Finally, we discuss open challenges, such as low complexity encoding, data dependency, measurement and modeling, interoperability, and security as future research directions. © 2016 Elsevier Ltd. All rights reserved.

14.Dynamic capabilities and organizational performance: The mediating role of innovation

Author:Zhou, SS;Zhou, AJ;Feng, JZ;Jiang, SS


Abstract:How firms' dynamic capabilities lead to their competitive advantage and improved firm performance has been a core issue and full of debates. In this research, we theorize that dynamic capabilities, which could be defined by three distinct dimensions (sensing capability, integration capability, and reconfiguration capability), facilitate different types of innovation that in turn improve firm performance. Based on a sample of 204 Chinese firms, results from partial least squares structural equation modeling analyses generally support our arguments despite some nuanced differences existing among different dimensions of dynamic capabilities. This study contributes to dynamic capabilities literature by reducing the scarcity of empirical research and by uncovering the mechanisms through which dynamic capabilities influence firm performance.

15.Contorted leadership in Chinese hierarchically oriented context How social governance influences organizational leaders

Author:Zhang, L;Zhang, XJ


Abstract:Purpose - The aim of this research is to explore the behavioral model of Chinese organizational leaders acquiring resources for the development of their organizations under the influence of hierarchically oriented social governance. Design/methodology/approach - The paper compares the differences between Western and Chinese contexts and conducts a grounded multi-case study to explore leadership behavioral model in the Chinese context. Findings - First, the Chinese social governance structure is hierarchically oriented, whereas the Western social governance structure is market oriented. Second, this unique inconformity found in the Chinese organizational leaders as contorted leadership, which refers to the inconsistency between leaders' cognition and their behavior when acquiring resources for the development of their organizations, is defined. Third, the conflict between leaders' cognition and behaviors is caused by the social governance mechanism within which leaders are embedded. Research limitations/implications - The authors have just made a first step to understand contorted leadership in the Chinese context, further researches should pay more attention to exploring the origins, functions and impacts of leaders' contorted behaviors. Originality/value - First, leadership is linked with social governance by emphasizing on the core role of social governance in allocating the resources which organizational leaders scramble for. Second, a new kind of leadership -contorted leadership - in the Chinese context that emphasizes on the contradiction between leaders' cognition and behavior, which deepens the understanding of leadership contextualization, is identified.

16.Supporting culturally and linguistically diverse students during clinical placement: strategies from both sides of the table

Author:O'Reilly, SL;Milner, J


Abstract:Background: Increasing proportions of Culturally and Linguistically Diverse (CALD) students within health professional courses at universities creates challenges in delivering inclusive training and education. Clinical placements are a core component of most health care degrees as they allow for applied learning opportunities. A research gap has been identified in regard to understanding challenges and strategies for CALD students in health professional placements. Methods: A key stakeholder approach was used to examine barriers and enablers experienced by CALD students in clinical placement. Semi-structured focus groups with healthcare students (n = 13) and clinical placement supervisors (n = 12) were employed. The focus groups were analysed using open coding and thematic analysis. Results: Three main barrier areas were identified: placement planning and preparation; teaching, assessment and feedback; and cultural and language issues. Potential solutions included addressing placement planning and preparation barriers, appropriate student placement preparation, pre-placement identification of higher risk CALD students, and diversity training for supervisors. For the barrier of teaching, assessment & feedback, addressing strategies were to: adapt student caseloads, encourage regular casual supervisor-student conversations, develop supportive placement delivery modes and structures, set expectations early, model the constructive feedback process, use visual aids, and tailor the learning environment to individual student needs. The enablers for cultural & language issues were to: build language and practical approaches for communication, raise awareness of the healthcare system (how it interacts with healthcare professions and how patients access it), and initiate mentoring programs. Conclusions: The findings suggest that teaching and learning strategies should be student-centred, aiming to promote awareness of difference and its impacts then develop appropriate responses by both student and teacher. Universities and partnering agencies, such as clinical training providers, need to provide an inclusive learning environment for students from multiple cultural backgrounds.

17.Knowledge Discovery and Recommendation With Linear Mixed Model

Author:Chen, ZY;Zhu, SX;Niu, Q;Zuo, TY

Source:IEEE ACCESS,2020,Vol.8

Abstract:We give a concise tutorial on knowledge discovery with linear mixed model in movie recommendation. The versatility of mixed effects model is well explained. Commonly used methods for parameter estimation, confidence interval estimate and evaluation criteria for model selection are briefly reviewed. Mixed effects models produce sound inference based on a series of rigorous analysis. In particular, we analyze millions of movie rating data with LME4 R package and find solid evidences for a general social behavior: the young tend to be more censorious than senior people when evaluating the same object. Such a social behavior phenomenon can be used in recommender systems and business data analysis.

18.The influence of the spatial characteristics of urban green space on the urban heat island effect in Suzhou Industrial Park

Author:Xiao, XD;Dong, L;Yan, HN;Yang, N;Xiong, YM


Abstract:Urban green spaces can mitigate urban warming problems to some extent. However, the cooling effect of plants differs spatially and temporally, and with plant features. To understand how plants affect urban surface and air temperature, 15 urban green spaces in Suzhou Industrial Park were selected to study the diurnal variation of summer air temperature. At the same time, the mitigation effect of different types of green spaces on the urban heat island (UHI) effect was investigated and further research was undertaken on the effect of green space area, perimeter area ratio, green space average canopy density, average leaf area index (LAI), and other factors influencing the cooling effect. Based on these studies, three representative parks were selected as samples to investigate the cooling effect of urban green space in terms of the water and wind environment. It was found that in the summer, large green spaces had a stable cooling and humidifying effect, while small green spaces had the opposite effect. The cooling and humidifying effect of large green spaces was more obvious and stable, and the cooling effect of small green spaces was more variable, with a heat preservation phenomenon occurring in some cases. The cooling effect of each green area was positively correlated with the green area, the average LAI of green space, and the average canopy density of green space. The cooling effect of each green area was significantly negatively correlated with the green area perimeter. Water bodies within green spaces did not contribute to cooling; however, the cooling effect was related to the wind environment. From the perspective of the planning and construction of city green spaces it is important to increase the green area and the reasonable planning green perimeter area ratio; however, suitable tree species should be selected in the greening process. The effect of urban greening in improving the urban ecological environment has been established. It was concluded that the cooling effects of such green areas are largely determined by plant type, canopy density, and park shapes. Therefore, it is suggested that a stronger emphasis is placed on the selection of plant species and the design of park shapes to achieve environmental cooling effects.

19.Does an institutional factor influence corporate environmental strategy? Looking through the Guanxi lens

Author:Cao, XW;Quazi, A


Abstract:Purpose - This paper aims to illustrate how institutional factors, such as Guanxi (connectedness) mechanism in a transition economy, could impact managerial cognition and their temporal orientation at individual level as well as induced change on corporate environmental strategy (CES). More specifically, this paper explores the micro foundation of corporate strategy change in an attempt to examine how corporate strategic choice and actions evolve with managerial cognition of "Guanxi" with various temporal orientations. Design/methodology/approach - The paper reviews the extant literature focusing on Guanxi and CES with special attention to the temporal orientation in strategy formulation. A conceptual framework is proposed to analyze the underlying mechanism of Guanxi in mediating and shaping CES. A multi-case study with four companies operating in two industry sectors were investigated considering their relative long foothold as well as their different postures and dynamic change of corporate environment strategy in the past decades. Findings - The findings support recent critiques on the likely shift in strategic choice of firms from the traditional Guanxi- based to a rule-based format. The interactions between entrepreneurial cognition and strategic activities toward environmental issues were still influenced by deep relational embeddedness. The findings proved that managerial Guanxi cognition impacts managers' temporal orientation and their strategic choice on CES. Foreign-invested enterprises in the process of localization face the potential risk of emerging backdrop of their CES, i.e. from more active strategy to more reactive strategic posture, whereas local private-owned enterprises show a transformation from reactor to follower and even pioneer in the wave of those entrepreneurs' changing cognition on the role of Guanxi in their businesses. Research limitations/implications - One main limitation of the study is the lacking of quantitative measurement of corporate environment performance. Although the paper used multiple cases to explore the dynamics of Guanxi on impacting CES, only with further development of effective scale measurement to test corporate environment performance can increase the explaining power of the proposed theoretical model in this study. It is important to note that with data of longitudinal measurement of corporate environment performance, it would be more convincing to show the outcome of the temporal lens of Guanxi on CES. However, the lacking availability of qualified disclosed data on indicating corporate environment performance constrains another limitation for the study. Considering the complexity of corporate environment strategy, the focus cases in the paper might still lack powerful and convincing illustration to prove the impact of Guanxi on CES despite the enriched contextual data and description. It is necessary to conduct deeper analysis to exclude the impact of other possible factors on CES to highlight the direct impact of Guanxi on CES. Practical implications - The results of the in-depth analysis and interpretation of the exploration of the cases suggest that Guanxi still seems to dominate managerial thinking process as the norm is deeply rooted in their mind sets. However, Guanxi is no longer considered as a mere reactive cultural norm rather a positive mechanism through which Chinese firms can achieve their sustainable environmental strategic goals as well as economies prosperity in the rapidly competitive business landscape in modern China. Originality/value - Previous research on CES largely neglected the context factors. This paper presents a conceptual model to deepen our understanding of the contextual factor of Guanxi with a temporal perspective and its consequent influence on CES. This helps policy makers as well as strategic management researchers and academics to reconsider the mechanism of adaptation and selection in shaping CES in the event of large scale institutional change.

20.The role of big data in smart city

Author:Hashem, IAT;Chang, V;Anuar, NB;Adewole, K;Yaqoob, I;Gani, A;Ahmed, E;Chiroma, H


Abstract:The expansion of big data and the evolution of Internet of Things (IoT) technologies have played an important role in the feasibility of smart city initiatives. Big data offer the potential for cities to obtain valuable insights from a large amount of data collected through various sources, and the IoT allows the integration of sensors, radio-frequency identification, and Bluetooth in the real-world environment using highly networked services. The combination of the IoT and big data is an unexplored research area that has brought new and interesting challenges for achieving the goal of future smart cities. These new challenges focus primarily on problems related to business and technology that enable cities to actualize the vision, principles, and requirements of the applications of smart cities by realizing the main smart environment characteristics. In this paper, we describe the state-of-the-art communication technologies and smart based applications used within the context of smart cities. The visions of big data analytics to support smart cities are discussed by focusing on how big data can fundamentally change urban populations at different levels. Moreover, a future business model of big data for smart cities is proposed, and the business and technological research challenges are identified. This study can serve as a benchmark for researchers and industries for the future progress and development of smart cities in the context of big data. (C) 2016 Elsevier Ltd. All rights reserved.
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