Philipp M. Mähner, Adnan Zogaj and Dieter K. Tscheulin
Consumers often start using mobile health apps but quit using them after a brief period of time. However, app providers can only ensure their long-term existence in the market if…
Abstract
Purpose
Consumers often start using mobile health apps but quit using them after a brief period of time. However, app providers can only ensure their long-term existence in the market if their app is used a long period, so that they can thus generate long-term revenue from advertising, subscriptions and sponsorships. Therefore, this study aims to gain a deeper understanding of the determinants of consumers’ continuous usage intention.
Design/methodology/approach
Based on a sample of 274 current mobile health app users, this study tests whether ideal self-congruence and/or functional congruence strengthens consumers’ continuous usage intention.
Findings
The results reveal that ideal self-congruence and functional congruence positively affect consumers’ continuous usage intention. Furthermore, an initial favorable attitude toward a mobile health app (i.e. ideal self-congruence) leads to a more favorable evaluation of the functional attributes of the app regardless of consumers’ objective evaluation of these attributes.
Practical implications
Providers should specifically take consumers’ ideal self-concept into consideration to increase consumers’ continuous usage intention of mobile health apps. Matching consumers’ ideal self-concept further leads consumers to a more favorable evaluation of the functional attributes of mobile health apps.
Originality/value
Only a few studies have examined factors influencing the continuous usage intention of mobile health apps; moreover, these studies have largely neglected the symbolic dimension of consumption behavior. Therefore, this study introduces congruence theory into the context of mobile health apps to provide a holistic view of the influence of the symbolic (i.e. ideal self-congruence) and utilitarian (i.e. functional congruence) dimensions on mobile health app consumption.
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Ming Feng, Hongyang Hu and Tianming Ren
To improve the load capacity and stability of gas foil journal bearings (GFJB), this paper aims to propose a novel GFJB with taper-grooved top foil.
Abstract
Purpose
To improve the load capacity and stability of gas foil journal bearings (GFJB), this paper aims to propose a novel GFJB with taper-grooved top foil.
Design/methodology/approach
A modified bump stiffness model is established considering rounding and friction. By considering the variation of clearance in the circumferential and axial direction, the static and dynamic characteristics of the novel bearing are calculated using the finite difference method, and perturbation method, respectively. The bearing performance under different groove parameters is studied and compared to the traditional bearings.
Findings
The results show that this novel GFJB can bring multi-extra local dynamic pressure and decrease the gas end leakage, which improves the static and dynamic properties. Moreover, as the increment of groove depth, the load capacity and direct stiffness are reinforced. There is an optimal groove width to maximize the load capacity, and the taper-groove is more beneficial to the improvement of bearing performance than other groove shapes. For the novel GFJB (Ng = 6, Hg = 10µm), the load capacity and direct stiffness increase by about 6.67 and 13.5 per cent, respectively. The stability threshold speed (STS) of a rotor supported by the novel bearings is also increased.
Originality/value
The performance of the presented novel GFJB is enhanced immensely compared to the traditional bearings, and the results are expected to be helpful to bearing designers, researchers and academicians concerned.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2019-0307.