De-Cheng Feng, Cheng-Dong Yang and Xiao-Dan Ren
This paper aims to present a multi-scale stochastic damage model (SDM) for concrete and apply it to the stochastic response analysis of reinforced concrete shear wall structures.
Abstract
Purpose
This paper aims to present a multi-scale stochastic damage model (SDM) for concrete and apply it to the stochastic response analysis of reinforced concrete shear wall structures.
Design/methodology/approach
The proposed SDM is constructed at two scales, i.e. the macro-scale and the micro-scale. The general framework of the SDM is established on the basis of the continuum damage mechanics (CDM) at the macro-scale, whereas the detailed damage evolution is determined through a parallel fiber buddle model at the micro-scale. The parallel buddle model is made up of micro-elements with stochastic fracture strains, and a one-dimensional random field is assumed for the fracture strain distribution. To represent the random field, a random functional method is adopted to quantify the stochastic damage evolution process with only two variables; thus, the numerical efficiency is greatly enhanced. Meanwhile, the probability density evolution method (PDEM) is introduced for the structural stochastic response analysis.
Findings
By combing the SDM and PDEM, the probabilistic analysis of a shear wall structure is performed. The mean value, standard deviation and the probability density function of the shear wall responses, e.g., shear capacity, accumulated energy consumption and damage evolution, are obtained.
Originality/value
It is noted that the proposed method can reflect the influences of randomness from material level to structural level, and is efficient for stochastic response determination of shear wall structures.
Details
Keywords
This research addressed online customer-to-customer (C2C) incivility during digital service recovery.
Abstract
Purpose
This research addressed online customer-to-customer (C2C) incivility during digital service recovery.
Design/methodology/approach
To examine the effectiveness of managerial responses to online C2C incivility post a restaurant service failure, a 2 (Managerial response: general vs specific) x 2 (Failure severity: high vs low) quasi-experimental design was employed. A pretest was conducted with 123 restaurant consumers via Amazon Mechanical Turk, followed by a main study with 174 restaurant consumers. Taking a mixed-method approach, this research first asked open-ended questions to explore how participants perceived the restaurant’s motivation for providing a generic versus a specific response. Hayes’ (2013) PROCESS procedure was then performed for hypotheses testing.
Findings
The results revealed significant interaction effects of managerial responses and failure severity on perceived online service climate and revisit intention, mediated by trust with managerial responses.
Originality/value
This research yielded unique insight into C2C incivility management literature and industry practices in the context of digital customer service recovery.
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Keywords
Mohammed Saïd Salah, Maizate Abderrahim, Ouzzif Mohamed and Toumi Mohamed
This paper aims to provide an acceptable level of security while taking into account limited capabilities of the sensors. This paper proposes a mobile approach to securing data…
Abstract
Purpose
This paper aims to provide an acceptable level of security while taking into account limited capabilities of the sensors. This paper proposes a mobile approach to securing data exchanged by structured nodes in a cluster.
Design/methodology/approach
The approach is based on mobile nodes with significant calculation and energy resources that allow cryptographic key management and periodic rekeying. However, mobility in wireless sensor networks aims to increase the security and lifetime of the entire network. The technical methods used in this paper are based on cryptography elliptic curves and key management through a balanced binary tree.
Findings
To maintain the effectiveness of critical applications based on wireless sensor networks, a good level of nodes security must be ensured, taking into account their limited energy and computing. Collaboration between powerful mobile nodes provides better coverage and a good key management. Owing to the significant capabilities of the mobile nodes, they can be used to secure critical applications at the same time if needed in applications requiring difficult operations.
Originality/value
To compare the performance of the proposed approach with other mobile algorithms, the following metrics are focused on: the energy consumed by normal sensors and cluster heads, the number of packets exchanged during key installation, time to generate and distribute cryptographic keys and the memory used by the different sensors to store keys.