Kangqu Zhou, Chen Yang, Lvcheng Li, Cong Miao, Lijun Song, Peng Jiang and Jiafu Su
This paper proposes a recommendation method that mines the semantic relationship between resources and combine it with collaborative filtering (CF) algorithm for crowdsourcing…
Abstract
Purpose
This paper proposes a recommendation method that mines the semantic relationship between resources and combine it with collaborative filtering (CF) algorithm for crowdsourcing knowledge-sharing communities.
Design/methodology/approach
First, structured tag trees are constructed based on tag co-occurrence to overcome the tags' lack of semantic structure. Then, the semantic similarity between tags is determined based on tag co-occurrence and the tag-tree structure, and the semantic similarity between resources is calculated based on the semantic similarity of the tags. Finally, the user-resource evaluation matrix is filled based on the resource semantic similarity, and the user-based CF is used to predict the user's evaluation of the resources.
Findings
Folksonomy is a knowledge classification method that is suitable for crowdsourcing knowledge-sharing communities. The semantic similarity between resources can be obtained according to the tags in the folksonomy system, which can be used to alleviate the data sparsity and cold-start problems of CF. Experimental results show that compared with other algorithms, the algorithm in this paper performs better in mean absolute error (MAE) and F1, which indicates that the proposed algorithm yields better performance.
Originality/value
The proposed folksonomy-based CF method can help users in crowdsourcing knowledge-sharing communities to better find the resources they need.
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Yang Zhou, Wenying Qu, Fan Zhou, Xinggang Li, Lijun Song and Qiang Zhu
This paper aims to understand the magnetohydrodynamics (MHD) mechanism in the molten pool under different modes of magnetic field. The comparison focuses on the Lorenz force…
Abstract
Purpose
This paper aims to understand the magnetohydrodynamics (MHD) mechanism in the molten pool under different modes of magnetic field. The comparison focuses on the Lorenz force excitation and its effect on the melt flow and solidification parameters, intending to obtain practical references for the design of magnetic field-assisted laser directed energy deposition (L-DED) equipment.
Design/methodology/approach
A three-dimensional transient multi-physical model, coupled with MHD and thermodynamic, was established. The dimension and microstructure of the molten pool under a 0T magnetic field was used as a benchmark for accuracy verification. The interaction between the melt flow and the Lorenz force is compared under a static magnetic field in the X-, Y- and Z-directions, and also an oscillating and alternating magnetic field.
Findings
The numerical results indicate that the chaotic fluctuation of melt flow trends to stable under the magnetostatic field, while a periodically oscillating melt flow could be obtained by applying a nonstatic magnetic field. The Y and Z directional applied magnetostatic field shows the effective damping effect, while the two nonstatic magnetic fields discussed in this paper have almost the same effect on melt flow. Since the heat transfer inside the molten pool is dominated by convection, the application of a magnetic field has a limited effect on the temperature gradient and solidification rate at the solidification interface due to the convection mode of melt flow is still Marangoni convection.
Originality/value
This work provided a deeper understanding of the interaction mechanism between the magnetic field and melt flow inside the molten pool, and provided practical references for magnetic field-assisted L-DED equipment design.
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Purpose – This study examines the association between social integration at work and health in three societies, urban China, Taiwan, and the United States.Methodology/approach �…
Abstract
Purpose – This study examines the association between social integration at work and health in three societies, urban China, Taiwan, and the United States.Methodology/approach – It analyzes nationally representative survey data collected simultaneously from those three societies. It measures five indicators of social integration at work (the percentage of work contacts among daily contacts, the number of daily work contacts, the percentage of daily work contacts within the company/organization among all daily work contacts, the number of daily work contacts within the company/organization, and the percentage of work discussants within the company/organization) and two health outcomes (psychological distress and self-reported health limitation).Findings – It finds stronger evidence for the positive health effect of social integration at work in urban China than in Taiwan and the United States.Research limitations/implications – The data set has two limitations: (1) it is cross-sectional; and (2) it was collected from national samples of adults aged 21–64, currently or previously employed, and does not have information on elderly employed adults. This study implies that social integration at work is more likely to protect health in urban China than in Taiwan and the United States.
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Nan Lin, Yanlong Zhang, Wenhong Chen, Dan Ao and Lijun Song
The paper advances the argument that social capital operates on both the supply and demand sides of the labor market. Organizations have significant needs for employees with…
Abstract
The paper advances the argument that social capital operates on both the supply and demand sides of the labor market. Organizations have significant needs for employees with social capital capacity and skills as they do with human capital. We articulate a theory on why organizations have such needs and how social capital may be differentially and strategically deployed to different positions. Specifically, three types of positions (the top positions, the edge positions, and the exchange-oriented positions) are identified with such needs. We formulated two hypotheses derived from the theoretical articulation: (1) the deploying hypothesis – organizations are expected to strategically recruit and deploy workers with social capital capacity and skills to such key internal and edge positions and (2) the institutional contingency hypothesis – organizations in the more competitive environment (e.g., the private sector) are more likely to show such differential deployment than those in the less competitive environment (e.g., the state sector). The hypotheses were subjected to an empirical examination with a set of firm data from China. Both hypotheses were confirmed. Further, we also found evidence for differential deployment of human capital (education and experience) and hierarchical capital (statuses of prior positions and organizations) in different sectors. We discuss the implications of the theory and findings for future research on organizations in different economic sectors beyond China and how a theory of deploying various types of capital – social capital, human capital, and hierarchical capital – in different economic sectors may be developed.
Steve McDonald, S. Michael Gaddis, Lindsey B. Trimble and Lindsay Hamm
Purpose – The introductory chapter to this special issue highlights contemporary scholarship on networks, work, and inequality.Methodology – We review the last decade of research…
Abstract
Purpose – The introductory chapter to this special issue highlights contemporary scholarship on networks, work, and inequality.Methodology – We review the last decade of research on this topic, identifying four key areas investigation: (1) networks and hiring, (2) networks and the labor process, (3) networks and outcomes at work, and (4) networks and institutional dynamics.Findings – Social networks play an important role in understanding the mechanisms by which and the conditions under which economic inequality is reproduced across gender, race, and social class distinctions. Throughout the review, we point to numerous opportunities for future research to enhance our understanding of these social processes.
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Chen-Yu Lin, Yun-Siou Chen and Yan-Shouh Chen
The purpose of this paper is to explore censorship on popular music in Taiwan and how the practices have influenced the consumption and production of music in the post-martial law…
Abstract
Purpose
The purpose of this paper is to explore censorship on popular music in Taiwan and how the practices have influenced the consumption and production of music in the post-martial law period.
Design/methodology/approach
Through adopting grounded theory with snowball sampling and ethnographic methods, this paper will interview music audiences and musicians as well as analyze recent censorship cases to develop a more comprehensive understanding of the topic.
Findings
Institutional and corporate self-censorship has a noteworthy influence on popular music in post-marital law Taiwan. Cross-strait relations still are a key tension that triggers censorship but the form has been shifting.
Originality/value
This study draws on both the complexity of censorship by case studies and the audience's perception of music in everyday life.
Details
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Zhen Cao, Jianbin Hu, Zhong Chen, Maoxing Xu and Xia Zhou
Wireless sensor networks, due to their potentially wide application perspectives, may proliferate in future. Two major stumbling blocks are the dynamic variance of the network…
Abstract
Purpose
Wireless sensor networks, due to their potentially wide application perspectives, may proliferate in future. Two major stumbling blocks are the dynamic variance of the network caused by both the capacity constraint of sensor nodes and uncertainties of wireless links, and secure routing in the special security sensitive environment. Therefore, adaptable and defendable routing mechanism is in urgent need for the deployment of sensor networks. This paper aims to propose a feedback‐based secure routing protocol (FBSR).
Design/methodology/approach
Feedback from the neighboring nodes serves as the dynamic information of the current network, with which sensor nodes make forwarding decisions in a secure and energy aware manner. Feedback message is included in the MAC layer acknowledgement frame to avoid network congestion, and it is authenticated with the proposed Keyed One Way Hash Chain (Keyed‐OWHC) to avoid feedback fabrication. FBSR's resilience to node compromise is enhanced by statistic efforts accomplished by the base station.
Findings
Both mathematical analysis and simulation results show that FBSR is not only reliable but also energy efficient.
Originality/value
The paper introduces a novel routing scheme for wireless sensor networks.