ORCID Profile
0000-0003-2579-580X
Current Organisation
University of Tasmania
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Frontiers Media SA
Date: 11-08-2022
DOI: 10.3389/FPSYG.2022.944976
Abstract: Mobile health (mHealth) services have been widely used in medical services and health management through mobile devices and multiple channels, such as smartphones, wearable equipment, healthcare applications (Apps), and medical platforms. However, the number of the users who are currently receiving the mHealth services is small. In China, more than 70% of internet users have never used mHealth services. Such imbalanced situation could be attributed to users’ traditional concept of medical treatment, psychological factors (such as low self-efficacy) and privacy concerns. The purpose of this study is to explore the direct and indirect effects of mHealth users’ self-efficacy and privacy concerns on their intention to adopt mHealth services, providing guidelines for mHealth service providers to enhance users’ intention of adoption. A questionnaire was designed by the research team and 386 valid responses were collected from domestic participants in China. Based on the unified theory of acceptance and use of technology (UTAUT) model, a research model integrated self-efficacy and privacy concerns was constructed to investigate their effects on users’ intention to adopt mobile mHealth services. The results show that self-efficacy could facilitate users’ intention to adopt mHealth services, and had a significantly positive effect on perceived ubiquity, effort expectancy, performance expectancy and subjective norm. This study verifies the direct and indirect effects of self-efficacy and privacy concerns on users’ intention to adopt mHealth services, providing a different perspective for studying mHealth adoption behavior. The findings could provide guidelines for mHealth service providers to improve their service quality and enhance users’ intention of adoption.
Publisher: MDPI AG
Date: 31-05-2022
DOI: 10.3390/SU14116760
Abstract: Environmental emergency management is an important practical subject for local governments. Understanding the different dimensions of environmental emergency management capability is crucial for enabling a well-informed governance performance. Based on the crisis management 4R theory (comprising four stages: reduction, readiness, response and recovery), PPRR emergency management theory (emergency management is categorized into four stages: prevention, preparation, response and recovery), crisis life cycle theory and ISO 22320, this paper ided local government environmental emergency management capability into four dimensions of a dynamic pre–during–post process: preparedness, early warning, response and recovery. This paper applied a confirmatory factor analysis model to confirm the classification standards of the four capabilities, which are strongly correlated within environmental emergency management. We found that China’s local government environmental emergency management capability is generally at an upper-middle level, according to the empirical data. We also analyzed the regional differences in local government environmental emergency management capability across China and concluded that the environmental emergency management capability of local governments in the eastern region is higher than those in other regions. The capability levels in the central, western and northeastern regions are more similar to each other and show a decreasing distribution in the east–central–west–northeast region.
Publisher: Elsevier BV
Date: 02-2022
Publisher: MDPI AG
Date: 10-08-2022
DOI: 10.3390/SU14169900
Abstract: The development of internet technology enables mobile medical health (mHealth) applications (Apps) to provide users with health services. The content presentation of apps is an important factor affecting users’ adoption of mHealth Apps. This study aims to examine the effect of the content presentation of mHealth Apps on users’ adoption intention, using the stimulus-organism-response (S-O-R) theory as the theoretical framework. A model of the effect of the content presentation of mHealth Apps on users’ intention to adopt, integrating perceived value and trust, was constructed. Furthermore, a quantitative study using a questionnaire survey was carried out to test the model. The analysis shows that platform information presentation, guidance information presentation, and relational information presentation indirectly have a significant positive effect on willingness toward participation and recommendation through the mediating effect of perceived value or trust. All three presentations have a significant positive effect on perceived value. Platform information presentation has a significant positive effect on trust in contrast to the other two presentations. In addition, the results reveal that perceived value and trust have a significant positive effect on willingness toward participation and recommendation, respectively. However, the effect of perceived value on trust is not significant. This work could provide measures and suggestions to improve users’ intention to adopt mHealth Apps as well as help researchers, developers, service providers, and app users to use and improve this modern mobile medical service.
Publisher: MDPI AG
Date: 30-03-2023
Abstract: To boost the performance of the air-cooling battery thermal management system, this study designed a novel vortex adjustment structure for the conventional air-cooling battery pack used in electric vehicles. T-shape vortex generating columns were proposed to be added between the battery cells in the battery pack. This structure could effectively change the aerodynamic patterns and thermodynamic properties of the battery pack, including turbulent eddy frequency, turbulent kinetic energy, and average Reynolds number, etc. The modified aerodynamic patterns and thermodynamic properties increased the heat transfer coefficient with little increase in energy consumption and almost no additional cost. Different designs were also evaluated and optimized under different working conditions. The results showed that the cooling performance of the Design 1 improved at both low and high air flow rates. At a small flow rate of 11.88 L/s, the Tmax and ΔT of Design 1 are 0.85 K and 0.49 K lower than the conventional design with an increase in pressure drop of 0.78 Pa. At a relative high flow rate of 47.52 L/s, the Tmax and ΔT of the Design 1 are also 0.46 K and 0.13 K lower than the conventional design with a slight increase in pressure drop of 17.88 Pa. These results demonstrated that the proposed vortex generating design can improve the cooling performance of the battery pack, which provides a guideline for the design and optimization of the high-performance air-cooling battery thermal management systems in electric vehicles.
Publisher: Elsevier BV
Date: 2023
Publisher: MDPI AG
Date: 02-11-2022
DOI: 10.3390/SU142114372
Abstract: As an important branch of the modern electronic health care services, mobile health applications (mHealth APP) have been widely accepted as a novel health care-providing platform. Based on mobile communications, mHealth is operated on smart terminals such as smart phones, tablet computers, wireless devices or wearable devices, providing multi-channel, multi-terminal and multi-network services. Because mHealth is not restricted by time and space, it serves as a more effective disease management tool for communications between patients and medical workers. In the background of “Internet+”, this study aims to explore the internal adoption behavior of mHealth users to improve the efficiency of medical services, reduce medical costs, and enrich the “Internet + medical health” research. Guided by the push-pull-mooring framework (PPM), this study proposes a conceptual model of mHealth users’ adoption behavior. A specially designed survey was used to collect data on users’ adoption behavior (n = 183). SPSS 25.0 (Guiyang, China) and AMOS 21.0 are used for data analysis. The results show that users’ adoption attitude partially mediates the relationship between the adoption intentions and three key factors (inconvenience, APP attractiveness, and high risk). The adoption intention also partially mediates the relationship between adoption attitude and adoption behavior. Peer influence does not have a direct effect on adoption intention, but it shows a statistically significant indirect effect on adoption intention and adoption behavior through adoption attitude. The negative effect of high switching cost is not significant for both adoption attitude and adoption intention. This study elucidates the internal mechanisms underlying mHealth users’ adoption behavior. The findings can help mHealth providers to arouse more users’ adoption behavior, improve the quality of medical services, and reduce medical costs.
Publisher: Elsevier BV
Date: 2023
Publisher: MDPI AG
Date: 24-11-2022
DOI: 10.3390/MCA27060101
Abstract: In recent years, the consensus-reaching process of large group decision making has attracted much attention in the research society, especially in emergency environment area. However, the decision information is always limited and inaccurate. The trust relationship among decision makers has been proven to exert important impacts on group consensus. In this study, we proposed a novel uncertain linguistic cloud similarity method based on trust update and the opinion interaction mechanism. Firstly, we transformed the linguistic preferences into clouds and used cloud similarity to ide large-scale decision makers into several groups. Secondly, an improved PageRank algorithm based on the trust relationship was developed to calculate the weights of decision makers. A combined weighting method considering the similarity and group size was also presented to calculate the weights of groups. Thirdly, a trust updating mechanism based on cloud similarity, consensus level, and cooperation willingness was developed to speed up the consensus-reaching process, and an opinion interaction mechanism was constructed to measure the consensus level of decision makers. Finally, a numerical experiment effectively illustrated the feasibility of the proposed method. The proposed method was proven to maximally retain the randomness and fuzziness of the decision information during a consensus-reaching process with fast convergent speed and good practicality.
Publisher: MDPI AG
Date: 24-11-2021
DOI: 10.3390/APP112311155
Abstract: The air-cooling battery thermal management system has been widely adopted as the thermal management device for power accumulators on electric vehicles nowadays. To improve the system heat transfer coefficient with the minimum rise in cost, this study modified conventional rectangular cell arrangements for 21,700 cylindrical cell battery packs with two approaches: 1. increase the vertical spacings 2. convert constant vertical spacings to gradient vertical spacings. The results show that smaller vertical spacings are beneficial to the overall cooling performances of the constant vertical spacings designs at almost all flow rates. The gradient vertical spacing design with larger spacing could deliver better temperature uniformity, while the one with smaller spacings could suppress the maximum temperature more efficiently at higher flow rates. However, the total battery pack volume of Design 7 (the largest gradient vertical spacing design) is 7.5% larger than the conventional design.
Publisher: Elsevier BV
Date: 12-2023
Publisher: Emerald
Date: 11-03-2019
Abstract: The paper aims to use aluminium alloy to substitute steel as the main material of ultra-precision hydro-static bearing system for an ultra-precision plastic electronics production system to lower the manufacturing cost. The total cost of diamond turning and nickel-based electroless coating of an aluminium alloy bearing is expected to be less than the cost of manufacturing a stainless steel bearing. The paper used a large amount of theoretical calculation to obtain optimal specifications of the bearing system. ANSYS modelling was selected to simulate the deflection of the bearing shaft under high oil pressure. Hundreds of measurements were conducted after the bearing had been manufactured. The paper provides industrial application insights on using aluminium alloy with a high-quality nickle-based electroless coating as a successful substitution of stainless steel. This created a more economic hydro-static bearing system. Because of the time limit, different rotational speed tests shall be conducted in the future. The paper provides implications for the application of nickel-based electroless coating to improve the surface property and bending strength of aluminium alloy, as well as classifying ultra-precision diamond turning as an economic finishing process. This paper has identified the importance of aluminium alloy with a nickel-based electroless coating as the substitution of stainless steel in a precision hydro-static bearing system.
Publisher: Elsevier BV
Date: 07-2021
Publisher: MDPI AG
Date: 07-06-2023
DOI: 10.3390/SU15129201
Abstract: Mature methanol vehicle technology with low exhaust emissions and economic benefits are a viable way to mitigate oil dependency and reduce greenhouse gas emissions. As a result, pilot projects for methanol vehicles have been carried out in 10 different cities in China over the last decade. They positively affect the economy and the environment, as shown by the acceptance results. This study chronologically reviewed the previous development and adopted pertinent policies determine the feasibility of deploying methanol vehicles from national to provincial levels. Based on the analysis and evaluations, the local government is suggested to make the following dynamic policy recommendations: (a) Before reaching the “carbon peak”, development strategies should be formulated according to the resource situation of each region. Priority should be given to the deployment of coal-to-methanol vehicles and bio-methanol vehicles to maximize the economy, so as to promote the construction of transmission and distribution systems, advance the manufacturing process of methanol fuel, and prepare the technology for the next stage. (b) In the second stage, the advancement of CO2-to-methanol technology should be promoted, focusing on the development of green methanol vehicles to better contribute to the “carbon neutrality”.
Publisher: MDPI AG
Date: 21-04-2022
DOI: 10.3390/SU14094975
Abstract: An air-cooling battery thermal management system is a reliable and cost-effective system to control the operating temperatures of the electric vehicle battery pack within an ideal range. Different from most designs of the rectangular battery pack in previous research, this one proposed a novel isosceles trapezoid layout to improve system heat dissipations. The simulation results showed that the trapezoid design delivered better cooling performances than the rectangular one with a maximum temperature reduction of 0.9 °C and maximum temperature difference reduction of 1.17 °C at the inlet air flow rate of 60 L/s. Moreover, the cooling performance was further boosted by an aluminum heat spreader. The boosted design delivers an average Max T (32.95 °C) and an average ΔT (3.10 °C) at five different flow rates, which are 8.8% and 66.1% lower the one without the spreader (35.85 °C and 5.15 °C). Compared with the rectangular design without the spreader, the average Max T and ΔT of the boosted trapezoid design are reduced by 10.4% and 91.9% in addition to a space-saving of about 5.26%.
Publisher: SAGE Publications
Date: 08-2022
DOI: 10.1177/09544089221116418
Abstract: Air cooling is a highly cost-effective method for the battery thermal management systems due to its simple structure, high reliability and low maintenance cost. Different from other designs of only a single inlet/outlet structure in the literature, an air-cooling battery thermal management system with multiple inlets/outlets design was proposed in this paper. The effects of inlet/outlet positions and dimensions on the air-cooling battery thermal management system performance were thoroughly evaluated and compared. The optimal inlet/outlet position and dimension were identified based on the maximum battery temperature and the temperature uniformity in the air cooling field. The results showed that the symmetrical double inlets/outlets design (Design 4) delivered the top temperature uniformity with the lowest energy consumption. During 1C discharging at 2 m/s inlet airflow, the maximum temperature and temperature difference of the Design 4 were 1.01 K and 2.24 K lower than those of the basic Design 0 in addition to a pressure difference reduction of 7.85 Pa. Based on the optimal Design 4, 0.03 m outlet width could further reduce the maximum temperature and temperature difference by 0.47 K and 0.28 K than the worst 0.05 m design. Furthermore, 52 additional simulations under different operating conditions had proven that the superb cooling performance of the optimal design during mild discharging operations (0.5–1C).
Publisher: Elsevier BV
Date: 09-2023
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Gang Zhao.