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A method has been developed for the solution of inverse heat diffusion problems to find the initial condition, boundary condition, and the source and sink function in the heat diffusion equation. The method has been used in the development of a source‐and‐sink method to find the boundary conditions in inverse Stefan problems. Green's functions have been used in the solution, and the problems are solved by using two approaches: a series solution approach, and a time incremental approach. Both can be used to find the boundary conditions without reliance on the flux information to be supplied at both sides of the interface. The methods are efficient in that they require less equations to be solved for the conditions. The numerical results have shown to be accurate, convergent, and stable. Most of all, the results do not degrade with time as in other time marching schemes reported in the literature. Algorithms can also be easily developed for the solution of the conditions.

A method has been developed for conjugate heat transfer analysis of fluid flow inside parallel channels formed by a phase change material (PCM) separated from the fluid by a wall. The phase change in the PCM is two dimensional and a hybrid analysis consisting of an analytical solution in one direction and a finite‐difference method in another direction is used to solve for the temperature in the PCM. The heat transfer fluid (HTF) inlet temperature is given and the heat transfer between the HTF and the PCM is treated as a conjugate problem that requires no iterations to obtain a solution. The numerical results are found to be stable, convergent, and accurate. Application of the method to the solution of heat extraction from a phase‐change energy storage unit is given in detail and the numerical results are shown to be accurate, based on an energy conservation analysis, to within 3%.

Companies are interested in engaging consumers in spreading the word about their products or brands. Although more and more studies are analysing word of mouth marketing (WOMM), the topic is still very recent, thus very little is known about how to develop a WOMM campaign effectively. This chapter develops a literature review on WOMM in social media for better understanding on how to manage WOMM.

The studies reviewed have allowed us to identify the main decisions that should be taken when planning a WOMM campaign: the selection of the seed, the type of message and the inclusion of incentives.

We identify the two types of objectives that companies can follow with WOMM: information diffusion or consumers’ persuasion. Depending on the campaign objectives, the strategy to be used in order to be successful is different.

This chapter can be useful to both, marketers, by showing them how to develop a WOMM campaign effectively; and researchers, by showing them the main gaps on WOMM that should be addressed in future studies.

This is one of the first attempts to review the literature and organize knowledge on WOMM. Concepts that have been treated as synonymous by many researchers such as opinion leaders, market mavens, innovative consumers, and hubs are clarified and distinguished one from the other which may help in improving previous knowledge on this field.

With the rapid surge of mobile marketing, an increasing number of brands have launched branded emoticons in an attempt to build brand relationships with consumers. Despite the apparent promise of branded emoticon usage, there is only limited academic research on branded emoticons. This paper aims to build on impression management theory and the conceptualization of cuteness to investigate how the effect of cuteness in branded emoticon design influences perceived playfulness in mobile instant messaging (MIM) interaction and the creation of brand engagement in self-concept.

Consumers with usage experience of branded emoticons in MIM apps were recruited to complete an online survey. Partial least squares structural equation modelling was used to analyze the data.

Two facets of cuteness – kindchenschema cuteness and whimsical cuteness – can project a favourable social image to consumers that facilitates playfulness in social interaction and enhances brand engagement in self-concept, which leads to their willingness to purchase the brand and stickiness to the MIM apps.

The popularity of branded emoticons represents a new form of social interaction and an innovative way to build brand relationships. The present study is the first to examine the design aspects of branded emoticons and highlights that the cuteness of a branded emoticon may be a crucial factor in engaging consumers in MIM.

Numerous scales have been developed and utilized in the tourism and hospitality field, yet, their psychometric properties have not been systematically reviewed and evaluated. This gap compromises researchers' ability to develop better measures and improve measurement decisions. In this current study, 56 scales were identified and evaluated in terms of their psychometric properties. It was found that most scales were imperfect in measuring tourism and hospitality domains, and most scales did not provide explicit information about the scale development procedures that were adopted. The scale development procedure and psychometric properties of the reviewed scales are summarized, evaluated, and recommendations are made for future tourism and hospitality scale development.

No methodology has been directly proposed to address the parameter optimization problem with weight effect on the categorical response. The aim of this paper is to propose a suitable procedure to address such a problem.

The computation of aggregation weight and neural network modeling technique were employed into forming the core architecture of the proposed approach. The consistency and difference of the weight effect between several experts or professionals can be included into the weight computation. The backpropagation neural network model is chosen to model the non‐linear relationship among the control factors, the probability, and the accumulated probability of categories for a qualitative response.

Weight effect for different categories of a qualitative response significantly exists in L/F manufacturing process. Including such weight effect into the L/F manufacturing analysis can achieve the parameter optimization and enhance their quality improvement.

This paper can be viewed as the first to address the parameter optimization problem for the categorical response with the weight effect consideration. The proposed approach can aid engineers making necessary decisions about quality improvement.

To ensure accurate position and force control of massage robot working on human body with unknown skin characteristics, this study aims to propose a novel intelligent impedance control system.

First, a skin dynamic model (SDM) is introduced to describe force-deformation on the human body as feed-forward for force control. Then a particle swarm optimization (PSO) method combined with graph-based knowledge transfer learning (GKT) is studied, which will effectively identify personalized skin parameters. Finally, a self-tuning impedance control strategy is designed to accommodate uncertainty of skin dynamics, system delay and signal noise exist in practical applications.

Compared with traditional least square method, genetic algorithm and other kinds of PSO methods, combination of PSO and GKT is validated using experimental data to improve the accuracy and convergence of identification results. The force control is effective, although there are contour errors, control delay and noise problems when the robot does massage on human body.

Integrating GKT into PSO identification algorithm, and designing an adaptive impedance control algorithm. As a result, the robot can understand textural and biological attributes of its surroundings and adapt its planning activities to carry out a stable and accurate force tracking control during dynamic contacts between a robot and a human.

This chapter aims to list the literature that document the role of hospitality industry achieving Sustainable Development Goals (SDGs), and to summarize those contributions, related to the literature. Extensive literature review was also conducted to explore a critical analysis of sustainable digitalization of the hospitality industry.

The article has undertaken a systematic literature review of all the significant research area of almost last two decades. Keyword searches were performed in Google Scholar search engine, where timeframe of “2001–2023” was used to filter the desired article. Total 141 research articles were primarily identified after the initial search. After screening the articles for relevance or duplicates, finally 107 articles were considered for this study.

This study figures out those environment-related SDGs which is considered essential for the hospitality industry. This study found the importance of adopting digitalization in hospitality sector to build inclusive environment and providing seamless experience to customers while focusing on both positive and negative aspects associated with digital transformation.

Hospitality industry of numerous countries around the world are now exploring by implementing SDGs and Digitalization in their business practices. This study will provide insight to policymakers as development and usage of digital technologies and implementing SDGs in their practices are crucial for the sustainable transformation of hospitality industry. Sustainable transformation of hospitality sector not only improves services and helps us to make wiser choices when planning for a trip but also positively impact both physical and psychological well-being.

To ensure the motion attitude and stable contact force of massage robot working on unknown human tissue environment, this study aims to propose a robotic system for autonomous massage path planning and stable interaction control.

First, back region extraction and acupoint recognition based on deep learning is proposed, which provides a basis for determining the working area and path points of the robot. Second, to realize the standard approach and movement trajectory of the expert massage, 3D reconstruction and path planning of the massage area are performed, and normal vectors are calculated to control the normal orientation of robot-end. Finally, to cope with the soft and hard changes of human tissue state and body movement, an adaptive force tracking control strategy is presented to compensate the uncertainty of environmental position and tissue hardness online.

Improved network model can accomplish the acupoint recognition task with a large accuracy and integrate the point cloud to generate massage trajectories adapted to the shape of the human body. Experimental results show that the adaptive force tracking control can obtain a relatively smooth force, and the error is basically within ± 0.2 N during the online experiment.

This paper incorporates deep learning, 3D reconstruction and impedance control, the robot can understand the shape features of the massage area and adapt its planning massage path to carry out a stable and safe force tracking control during dynamic robot–human contact.

There are many types of the ADCs implemented in the mobile and wireless devices. Most of these devices are battery operated and operational at low input voltage. SAR ADC is popular for its low power operations and simple architecture. Scientists are still working to make its working faster under the same low power area. There are many SAR-ADC implemented in the past two decades, but still, there is a big room for dual SAR-ADC.

The authors are presenting a dual SAR-ADC with a smaller number of components and blocks. The proposed ultra-low-power circuit of the SAR-ADC consists of four major blocks, which include Bee-bootstrap, Spider-Latch dual comparator, dual SAR-logic and dual digital to analog converter. The authors have used the 90-nm CMOS library for the construction of the design.

The power breaks down of the comparator are dramatically improved from 0.006 to 0.003 uW. The ultimate design has 5 MHz operating frequency with 25 KS/s sampling frequency. The supply voltage is 1.2 V with 35.724 uW power consumption. Signal-to-noise and distortion ratio and spurious-free dynamic range are 65 and 84 dB, respectively. The Walden's figure of merits calculated 7.08 fj/step.

The authors are proposing two-in-one circuit for SAR-ADC named as “dual SAR-ADC”, which obeys the basic equation of duality, derived and proved under the heading of proposed solution. It shows a clear difference between the performance of two circuit-based ADC and one dual circuit ADC. The number of components is reduced by sharing the work load of some key components.