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Article
Publication date: 3 December 2018

Wee-Kheng Tan and Bo-Yuan Lee

The purpose of this paper is to investigate the credibility assessment and adoption of electronic word-of-mouth on online social-networking sites, social word-of-mouth…

Abstract

Purpose

The purpose of this paper is to investigate the credibility assessment and adoption of electronic word-of-mouth on online social-networking sites, social word-of-mouth (sWOM), where the author writes product reviews on Facebook and hopes their Facebook friends will buy these products. The readers of the sWOM message are aware of the author’s commercial intentions. sWOM messages on search goods and experience goods are considered separately.

Design/methodology/approach

Author of sWOM messages invites their closed circle of Facebook friends to participate in a survey. The respondents are randomly assigned to read a product review of a search good (i.e. a laptop computer) or an experience good (i.e. a moisturizer cream (beauty product)). The partial least squares method is used to analyze the data from 339 returns (166 for the search good and 173 for the experience good).

Findings

The sWOM readers’ assessments of the messages’ credibility remain free from commercial influence. While the traditional factors of credibility and author-reader tie strength continue to influence the adoption of sWOM message, readers’ perceptions of the sWOM author’s marketing skills is also a factor. The relationships between the constructs depend on whether the products are search or experience goods.

Originality/value

Few studies investigate the type of sWOM considered here. Commercially influenced sWOM messages are effective since the author’s marketing skills, and other often-cited factors, affect the credibility and adoption of sWOM. Thus, the equality-matching (friendship) relationship and the market-pricing (sales) relationship can work hand-in-hand in the sWOM context.

Details

Online Information Review, vol. 43 no. 3
Type: Research Article
ISSN: 1468-4527

Keywords

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Article
Publication date: 10 April 2019

Qingchao Sun, Xiaokai Mu, Bo Yuan, Jiawen Xu and Wei Sun

This paper aims to distinguish the relationship between the morphology characteristics of different scales and the contact performance of the mating surfaces. Also, an…

Abstract

Purpose

This paper aims to distinguish the relationship between the morphology characteristics of different scales and the contact performance of the mating surfaces. Also, an integrated method of the spectrum analysis and the wavelet transform is used to separate the morphology characteristics of the actual machined parts.

Design/methodology/approach

First, a three-dimensional (3D) surface profilometer is used to obtain the surface morphology data of the actual machined parts. Second, the morphology characteristics of different scales are realized by the wavelet analysis and the power spectral density. Third, the reverse modeling engineering is used to construct the 3D contact models for the macroscopic characteristics. Finally, the finite element method is used to analyze the contact stiffness and the contact area of the 3D contact model.

Findings

The contact area and the nominal contact pressure Pn have a nonlinear relationship in the whole compression process for the 3D contact model. The percentage of the total contact area of the macro-scale mating surface is about 70 per cent when the contact pressure Pn is in the range of 0-100 MPa, and the elastic contact area accounts for the vast majority. Meanwhile, when the contact pressure Pn is less than 10MPa, the influence factor (the relative error of contact stiffness) is larger than 50 per cent, so the surface macro-scale morphology has a weakening effect on the normal contact stiffness of the mating surfaces.

Originality/value

This paper provides an effective method for the multi-scale separation of the surface morphology and then lays a certain theoretical foundation for improving the surface quality of parts and the morphology design.

Details

Engineering Computations, vol. 36 no. 3
Type: Research Article
ISSN: 0264-4401

Keywords

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Article
Publication date: 21 August 2018

Bo Li, Bo Yuan, Shuai Tang, Yuwen Mao, Dongmei Zhang, Changyun Huang and Bilian Tan

This paper aims to investigate weight-climbing assistance strategy for the biomechanical design of passive knee-assisting exoskeleton (PKAExo) and evaluate a designed…

Abstract

Purpose

This paper aims to investigate weight-climbing assistance strategy for the biomechanical design of passive knee-assisting exoskeleton (PKAExo) and evaluate a designed PKAExo which stores energy when the knee joint flexes and releases the energy to assist ascending when the knee joint extends.

Design/methodology/approach

The authors constructed theoretic modeling of human weight-climbing to analyze characteristics of knee angle and moment. They then conducted camera-based movement analysis, muscle strength and endurance tests and surface electromyography (sEMG) measures to verify the relationship of knee angle and moment with both stair height and load weight. Afterwards, the authors proposed an assistant strategy for passive knee assistance, then gave out designed PKAExo and conducted mechanical experiment to test the knee-assisting torque. Finally, the authors conducted comparison experiment based on measuring the sEMG signals of knee extensor to verify the assistance effect of the PKAExo for weight-climbing.

Findings

The knee extensor produces the maximum force during weight-climbing, and the muscle force provided by knee extensor has significant increasing rate along with the stair height. Thus, the assistance torque of PKAExo is designed to increase nonlinearly along with increasing knee angle. It stores energy when knee flexes and assists when knee extends. Both the mechanical experiment and comparison experiment have demonstrated that the PKAExo is able to provide nonlinear assistance torque for weight-climbing, thus decreasing the average maximum load of knee extensor by about 21 per cent, reducing muscle fatigue and enhancing wearer’s weight-climbing ability.

Originality/value

The authors construct theoretic maximum force model produced by knee extensor for weight-climbing in static situation and conduct a series of experiments to verify and revise the model, which is the fundamental reference for knee-assisting mechanism designed for weight-climbing. The authors have also provided and validated an assistant strategy and the mechanism based on the biomechanical analysis, which aims to translate wearer’s energy-providing mode form high load to mid-low load by storing energy when knee flexes and assisting when knee extends. The PKAExo decreases the maximum load of knee extensor, reduces muscle fatigue and helps people to easily climb with load.

Details

Industrial Robot: An International Journal, vol. 45 no. 4
Type: Research Article
ISSN: 0143-991X

Keywords

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