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The purpose of this paper is to illustrate the new technical demands and reliability challenges to printed circuit board (PCB) designs, materials and processes when the transmission frequency increases from Sub-6 GHz in previous generations to millimeter (mm) wave in fifth-generation (5G) communication technology.

The approach involves theoretical analysis and actual case study by various characterization techniques, such as a stereo microscope, metallographic microscope, scanning electron microscope, energy dispersive spectroscopy, focused ion beam, high-frequency structure simulator, stripline resonator and mechanical test.

To meet PCB signal integrity demands in mm-wave frequency bands, the improving proposals on copper profile, resin system, reinforcement fabric, filler, electromagnetic interference-reducing design, transmission line as well as via layout, surface treatment, drilling, desmear, laminating and electroplating were discussed. And the failure causes and effects of typical reliability issues, including complex permittivity fluctuation at different frequencies or environments, weakening of peel strength, conductive anodic filament, crack on microvias, the effect of solder joint void on signal transmission performance and soldering anomalies at ball grid array location on high-speed PCBs, were demonstrated.

The PCB reliability problem is the leading factor to cause failures of PCB assemblies concluded from statistical results on the failure cases sent to our laboratory. The PCB reliability level is very essential to guarantee the reliability of the entire equipment. In this paper, the summarized technical demands and reliability issues that are rarely reported in existing articles were discussed systematically with new perspectives, which will be very critical to identify potential reliability risks for PCB in 5G mm-wave applications and implement targeted improvements.

This study finds out if a satisfied physician will show citizenship behaviour (OCB) in a work environment where psychological contract breach (PCB) exist.

Quantitative data from 214 physicians across 26 health-care units were analysed. Research philosophy was positivism, research design was explanatory and study design was cross-sectional. Preliminary tests were conducted. Reflective measurement and structural models were examined. PLS algorithm tool and bootstrapping procedure were utilised. Control variables were sex, age, employment type and tenure. A significant level was set at 5%. Smart PLS 2.0M.3 software was employed.

The scientist found support for a significant moderating effect of PCB on the nexus between job satisfaction (JST) and OCB, such that PCB demoralised a satisfied physician in showing OCB. In contrast, a fulfilled psychological contract motivated satisfied physicians to exhibit OCB.

PCB, if not addressed, may lead satisfied physicians to show low OCB, which has devastating effects for health-care organisations and their patients. Creating balanced, fulfilled and harmonious relationship within physicians will transform the workplace into a more meaningful and purposeful atmosphere.

This study offers empirical health-care literature on the moderating effect of PCB, a psychosocial stressor, on the direct relationship between JST and OCB, integrating and lengthening the social exchange theory, resource-based theory and activation theory.

This study aims to investigate whether country governance, regulated industry and firm-level characteristics, namely, ownership structure and firm size, are associated with the likelihood of firms having a politically connected board (PCB). This study also examines whether country governance and concentrated ownership moderates the association between institutional ownership and PCB.

This study uses cross-country analysis using 20 countries and hand-collected PCB data from 574 firms and 1,701 firm-year. This study performs logit regression analyses to examine hypotheses.

The results document that countries’ accountability, industry type and institutional ownership are associated with the likelihood of firms having a PCB. This study also finds that country governance, especially accountability, moderates the relationship between institutional ownership and PCBs. The results thus indicate the importance of country governance, especially accountability, in determining institutional investors’ political strategies.

This study provides several implications. First, firms tend to elect PCBs as a non-financial strategy because it arguably delivers additional resources and improves their performance, especially in countries with lower accountability and regulated industries. Meanwhile, investors and management must also hire PCBs cautiously because PCBs are closely related to agency issues. Agency issues reflect on the finding that institutional investors tend to avoid PCBs. However, the relationship between institutional investors and PCBs is closely related to the country-level context, especially accountability. This study also advises policymakers that country governance, especially accountability, is crucial in regulating the relationship between business and politics.

This study uses a relatively large number of new PCB and institutional ownership data collected manually from 20 countries. This study also examines several variables of country governance, such as accountability to PCB decisions that have not been tested before. This study examines the relationship between institutional ownership and PCB ownership decisions that were not examined before and uses a cross-country sample. In addition, to the best of the authors’ knowledge, this study is the first one that examines the role of state governance, especially accountability for the relationship between institutional ownership and PCBs.

Based on the trait activation theory and social exchange theory, this study proposed a model of the impact of Machiavellian personality on organisational cynicism (OC) through the mediating effect of psychological contract breach (PCB) and the moderating role of leader-member exchange (LMX) quality in PCB and OC.

A three-time points survey involving 264 employees from China’s hotel industry was conducted using quantitative methods. Subsequently, a structural equation model was constructed.

The results revealed that Machiavellianism positively affects OC, and PCB plays a mediating role in this process. In addition, LMX quality can buffer the effect of the PCB on OC.

The study’s findings provide another insight into the relationship between Machiavellianism, PCB and OC. Managers must pay attention to the control of PCB and the establishment of LMX quality.

The study significantly contributes to hotel literature, as the Machiavellian personality subject has not been adequately investigated in the field to date.

This study aims to examine the relationship between employees’ psychological contract breach and two types of voice behavior based on the social exchange theory. Additionally, the study explores the role of globally responsible business leadership in buffering the negative impacts of psychological contract breach on voice.

Survey data was collected from Chinese full-time employees and the final sample size is 337. Partial least squares structural equation modeling was used to test the hypotheses.

Findings indicate that psychological contract breach (PCB) has a positive and significant impact on employee aggressive voice behavior (AVB), while its relationship with constructive voice behavior (CVB) is not significant. Furthermore, globally responsible business leadership (GRBL) weakens the negative relationship between PCB and CVB, while strengthens the positive relationship between PCB and AVB.

The findings assist organizations in better recognizing the detrimental consequences of psychological contract breach. Second, the findings serve as a reminder to managers of the benefits of displaying globally responsible business leadership. Third, managers should recognize the complexities of globally responsible business leadership.

First, this study sheds new light on the impact of PCB on employees’ desirable and undesirable proactive behaviors by investigating how and when psychological contract breach affects two types of voice behavior. Second, the moderating role of GRBL further enriches our understanding of how to buffer negative effects of PCB and the desirable function of GRBL. Third, this study enriches the social exchange theory by investigating whether the leader−employee relationship will compensate for the failure of organization−employee relationship.

Work–family conflict (WFC) is rife among construction professionals, leading to a significant negative impact on their work engagement. Building on an extant body of research, this study provides nuanced insights into the link between WFC, work–life balance (WLB) and work engagement and identifies the boundary conditions of these relationships.

Data were collected from 257 dyads of construction professionals and their immediate supervisors from a sample of five construction firms based in India using an online survey.

The results found that WLB mediates the relationship between WFC and work engagement, and the relationship is controlled by professionals' gender and perceptions of psychological contract breach (PCB). An important finding is that PCB accentuates the negative influence of WFC on work engagement via WLB. The study also reveals that the negative impact of WFC on WLB is stronger for women.

The findings are relevant for construction firms since they are primarily dominated by men and continue to struggle to attract more women professionals. The study insights provide avenues to expand existing research on the relationship between WFC and work engagement and offer managerial implications for improving construction professionals' work engagement in the high-pressure context of the construction industry.

The study significantly advances the underdeveloped literature on work–family interface, especially in the unique work settings of the construction industry, by establishing WFC as a predictor and revealing how engagement at work is affected. It highlights the importance of boundary conditions such as gender and PCB. It is one of the first to assess the relationship between WFC, WLB, PCB and work engagement among construction professionals in India.

This study examines the mediating and moderating role of proactive career behavior (PCB) and role ambiguity (RA) in the relationship between transformational leadership and subjective career success (SCS).

This study is a moderated mediation model with a sample size of 408 employees as respondents working in seven different organizations in the hospitality industry in the northern region of India. For the analysis of data, SmartPLS is used, and moderated mediation is done by Hayes Process Macro.

The results report that PCB mediates the relationship between transformational leadership and SCS. Also, it has been found that RA will moderate this relationship.

The result of the study on SCS will be beneficial for organizations facing high attrition. Also, the paper brings forth the importance of transformational leadership and the impact of RA on employees' career success. Leaders and seniors in an organization need to focus on reducing RA.

This study is unique since the relationship between transformational leadership and SCS has been examined in the hospitality industry. In addition, perhaps RA as a moderator influencing PCB and career success has been studied for the first time.

The purpose of this study is to propose a simplifying approach for modelling a reliability test. Modelling the reliability tests of printed circuit board (PCB)/microelectronic component assemblies requires the adoption of several simplifying assumptions. This study introduces and validates simplified assumptions for modeling a four-point bend test on a PCB/wafer-level chip scale packaging assembly.

In this study, simplifying assumptions were used. These involved substituting dynamic imposed displacement loading with an equivalent static loading, replacing the spherical shape of the interconnections with simplified shapes (cylindrical and cubic) and transitioning from a three-dimensional modelling approach to an equivalent two-dimensional model. The validity of these simplifications was confirmed through both quantitative and qualitative comparisons of the numerical results obtained. The maximum principal plastic strain in the solder balls and copper pads served as the criteria for comparison.

The simplified hypotheses were validated through quantitative and qualitative comparisons of the results from various models. Consequently, it was determined that the replacement of dynamic loading with equivalent static loading had no significant impact on the results. Similarly, substituting the spherical shape of interconnections with an equivalent shape and transitioning from a three-dimensional approach to a two-dimensional one did not substantially affect the precision of the obtained results.

This study serves as a valuable resource for researchers seeking to model accelerated reliability tests, particularly in the context of four-point bending tests. The results obtained in this study will assist other researchers in streamlining their numerical models, thereby reducing calculation costs through the utilization of the simplified hypotheses introduced and validated herein.

Workplace bullying is a serious problem among nurses, which results in negative workplace behavior. Therefore, this study aims to understand how workplace bullying affects employees’ knowledge hiding behavior. Specifically, this study explored psychological contract breach as an underlying mechanism between workplace bullying and knowledge hiding; and learning goal orientation as a boundary condition between psychological contract breach and knowledge hiding.

The study collected data from 343 nurses working in the health-care sector of Pakistan on convenience basis using a questionnaire-based survey between December 2021 to March 2022. The data were analyzed through structural equation modeling.

The results revealed the adverse effect of workplace bullying on knowledge hiding behaviors among nurses, and psychological contract breach was noted to mediate this association. Further, learning goal orientation was noted to buffer the relationship between psychological contract breach and knowledge hiding.

The cross-section design may restrict causality; however, the findings suggest health-care administration take appropriate measures to reduce the adverse effects of workplace bullying. In addition, the administration is suggested to implement training programs to make nurses capable of dealing with workplace stressors (bullying and psychological contract breach).

This research provides a novel perspective to consider psychological contract breach as a mechanism between workplace bullying and knowledge hiding in the health-care sector from the conservation of resources perspective. It further explored learning goal orientation as a buffer to mitigate the effect of psychological contract breach on knowledge hiding.

This paper aims to investigate the moisture diffusion behavior in a system-in-package module systematically by moisture-thermalmechanical-coupled finite element modeling with different structure parameters under increasingly harsh environment.

A finite element model for a system-in-package module was built with moisture-thermal-mechanical-coupled effects to study the subsequences of hygrothermal conditions.

It was found in this paper that the moisture diffusion path was mainly dominated by hygrothermal conditions, though structure parameters can affect the moisture distribution. At lower temperatures (30°C~85°C), the direction of moisture diffusion was from the periphery to the center of the module, which was commonly found in simulations and literatures. However, at relatively higher temperatures (125°C~220°C), the diffusion was from printed circuit board (PCB) to EMC due to the concentration gradient from PCB to EMC across the EMC/PCB interface. It was also found that there exists a critical thickness for EMC and PCB during the moisture diffusion. When the thickness of EMC or PCB increased to a certain value, the diffusion of moisture reached a stable state, and the concentration on the die surface in the packaging module hardly changed. A quantified correlation between the moisture diffusion coefficient and the critical thickness was then proposed for structure parameter optimization in the design of system-in-package module.

The different moisture diffusion behaviors at low and high temperatures have seldom been reported before. This work can facilitate the understanding of moisture diffusion within a package and offer some methods about minimizing its effect by design optimization.