Ming‐Chih Yew, Chien‐Chia Chiu, Shu‐Ming Chang and Kuo‐Ning Chiang
The coefficient of thermal expansion (CTE) mismatch between silicon and organic printed circuit board (PCB) materials causes a reliability issue for ball grid array type…
Abstract
Purpose
The coefficient of thermal expansion (CTE) mismatch between silicon and organic printed circuit board (PCB) materials causes a reliability issue for ball grid array type electronic packages. This makes it difficult for conventional wafer level chip scaled packaging (WLCSP) with large die to satisfy the reliability requirements. Therefore, in this study a novel solder joint protection‐WLCSP (SJP‐WLCSP) structure is proposed to overcome the reliability issue.
Design/methodology/approach
The SJP‐WLCSP makes use of a delaminating layer to reduce the problem of CTE mismatch. In the SJP‐WLCSP, a delaminating layer is interposed between the top layer of the chip and the bottom insulating layer of the redistribution copper metal traces. As a result, the stress on the solder joints can be released by allowing cracks to form in the delaminating layer.
Findings
To elucidate the thermo‐mechanical behaviour of tin‐lead eutectic solder joints and copper traces, a non‐linear analysis, based on a 3D finite element (FE) model, under accelerated thermal test loadings was carried out. The maximum equivalent stress/strain in the solder joints predicted by the FE simulation were found to diminish significantly when applying the delaminating layer. In addition, parametric FE analysis was also applied in this study, and based on the design concepts within this study, a robust novel SJP‐WLCSP could be achieved.
Originality/value
In this work, a new packaging concept with high reliability, low cost and easy fabrication was developed to reduce the shear stress in the solder joints due to the CTE mismatch between silicon chips and organic PCBs.
Details
Keywords
Li‐Cheng Shen, Wei‐Chung Lo, Hsiang‐Hung Chang, Huan‐Chun Fu, Yuan‐Chang Lee, Yu‐Chih Chen, Shu‐Ming Chang, Wun‐Yan Chen and Ming‐Chieh Chou
To characterise the optical performance of organic multi‐mode optical waveguides integrated with printed circuit board (PCB) and to demonstrate the feasibility of 2.5 and 10 Gbps…
Abstract
Purpose
To characterise the optical performance of organic multi‐mode optical waveguides integrated with printed circuit board (PCB) and to demonstrate the feasibility of 2.5 and 10 Gbps optical interconnection in board‐level, respectively.
Design/methodology/approach
This paper provides both qualitative and quantitative approaches for the characterization the wave guide performance, i.e. using loss measurement, optical beam profiling, ethernet verification, and eye‐diagram testing. In addition to wave guide loss measurement, the most significance part of the work reported in this paper is to evaluate optical wave guides with coupled VCSELs, by which a 3 dB coupling design budget can thus be identified. Furthermore, by artificially manipulating coupling conditions, practical concerns of EOPCB integration, including waveguide geometry, VCSEL driving power, alignment tolerance, coupling spacing, etc. are studied.
Findings
Thermal stability studies related to PCB lamination processes show the feasibility of organic waveguides integrated to traditional PCB manufacturing. For a direct VCSEL/PD coupling scheme, a 3 dB power budget is experimentally identified. For short reach optical interconnection, 10 Gbps up to 17 cm propagation on PCB can be achieved by using 50×50 μm multi‐mode organic waveguides, where a±25 μm tolerance of optical alignment is compatible to the design rules of PCB.
Originality/value
The value of the paper lies in its systematic approaches to identify the waveguide performance through both qualitative and quantitative indices. The correlation between geometry design, processes, coupling conditions, and optical performance of organic waveguides explored in detail. Not only is a standard eye‐diagram test used to verify the waveguide at 2.5 and 10 Gbps bandwidth, but also a prototype of optical data‐communication on giga‐ethernet is demonstrated for long term stability. Following these analytical methods, readers can understand more about the optical performance of waveguides when designing optical interconnection for high speed electro‐optical integrated PCBs.
Details
Keywords
Purpose – This chapter examines the roles of the Unification Church (UC) in reconstructing the discourse of the gendered desire of Filipina marriage migrants and their Korean…
Abstract
Purpose – This chapter examines the roles of the Unification Church (UC) in reconstructing the discourse of the gendered desire of Filipina marriage migrants and their Korean husbands, serving as an intermediary agency in the process of international marriage migration, and reinforcing heterosexual practices as part of a regime of normalization.
Methodology – The chapter is based on 1 year of ethnographic fieldwork that included a review of secondary sources, participant observation, and in-depth interviews with Filipinas and Korean men.
Findings – The chapter shows the ways in which the UC reinforces the dominant discourse of gendered desire that portrays marriage migrants as women who wish to migrate mainly to marry a man who can provide economic stability. Filipina migrants, however, infuse the cultural discourse of romantic love into their decisions about husbands and marriage migration. Lastly, as the UC delineates normative heterosexual practices based on its religious doctrines, the church becomes a “regime of normalization” for traditional patriarchal heteronormativity.
Social implications – The chapter contributes to the idea that gender and sexuality are socially constructed and constitutive of migration.
Originality/value of chapter – The chapter examines not only the matchmaking role of an intermediary agency that facilitates cross-border marriages but also the agency's role in re/constructing gendered desire. Further, the chapter contributes to an understudied area: the social process of reconstructing heteronormativity in a transnational context.
Details
Keywords
Dong-Shang Chang, Shu-Ming Liu and Yi-Chun Chen
The purpose of this paper is to find the key innovative principles for evaluating the long-term care (LTC) cloud system by exploring contradictory and complex points in its…
Abstract
Purpose
The purpose of this paper is to find the key innovative principles for evaluating the long-term care (LTC) cloud system by exploring contradictory and complex points in its development.
Design/methodology/approach
The theory of inventive problem solving (TRIZ) and the decision-making trial and evaluation laboratory (DEMATEL) approaches are integrated to resolve complex contradictions in the system. The heuristic reasoning of TRIZ is applied to obtain innovation principles for an LTC cloud mining system. However, the importance and feasibility of these innovative principles require further assessment. In this study, DEMATEL is employed to clarify the complex relationships among the principles and evaluate their key influences.
Findings
This paper identifies six primary contradictions and derives 25 innovative principles for the resolution of these conflicts. Further analysis confirms three key innovative principles. First, the government should consider the overall planning of the cloud system platform, followed by the participation of other medical and LTC institutions. Second, the information capability of LTC institutions should be unified by recording the pathology data of care recipients to create an information exchange system. Third, LTC institutions should act in cooperation with medical institutions to provide professional medical capabilities.
Originality/value
The contributions of this paper are two-fold. First, this study provides an integrated methodology integrating the TRIZ and DEMATEL approaches to resolve LTC problems. Second, this research identifies the key innovative principles for developing an LTC cloud system in Taiwan.
Details
Keywords
Shu‐ming Wang and Judy Chuan‐Chuan Lin
The objective of this paper is to further explore relationships among social influence, blog platform qualities and usage intention for improving the understanding of the effect…
Abstract
Purpose
The objective of this paper is to further explore relationships among social influence, blog platform qualities and usage intention for improving the understanding of the effect that social influence exerts on bloggers' usage intention.
Design/methodology/approach
Based on the IS success model, the authors propose a conceptual framework incorporating information quality, system quality, blog function quality and social influence as key determinants of bloggers' usage intention. Empirical data from 613 participants were collected via a web survey.
Findings
The results show that information quality, system quality and blog function quality, i.e. the technical factors, positively influence bloggers' usage intention. Among these qualities, system quality is the most prominent. For social factors, social influence significantly affects bloggers' usage intention directly and indirectly through blog platform qualities. A multi‐group analysis revealed the differences between blog readers and writers in the perceptions of blog platform qualities and the intensity of path coefficients among factors in the conceptual model.
Practical implications
Results from this study can be used as guidance for blogging service providers to enhance and develop blog platform functions. Moreover, the differences between blog readers and writers revealed in the findings can help service providers to develop campaigns to strengthen their usage intention accordingly.
Originality/value
This paper advances the understanding of the effects of social influence on users' perception of information system qualities as well as usage intention. Social influence exhibits strong effects on users' perception of blog platform qualities. Specifically social influence not only directly affects bloggers' usage intention but also has an indirect effect on intention through the mediation of blog platform qualities.
Details
Keywords
Emily J. Kothe and Barbara Mullan
A number of interventions aimed at increasing breakfast consumption have been designed and implemented in recent years. This paper seeks to review the current research in this…
Abstract
Purpose
A number of interventions aimed at increasing breakfast consumption have been designed and implemented in recent years. This paper seeks to review the current research in this area with the aim of identifying common features of successful interventions and strengths and weaknesses in the current research methodology.
Design/methodology/approach
A systematic review of interventions aimed at increasing breakfast‐eating frequency in a non‐clinical sample was conducted.
Findings
A total of 11 interventions were identified and reviewed; of these, only three resulted in an increase in breakfast consumption at follow‐up. The three studies that were successful in changing breakfast consumption all included a psychosocial component that was successful in increasing positive attitudes towards nutrition in the intervention protocol. Many of the breakfast‐eating interventions included in this review have methodological weaknesses, including difficulties in implementing interventions, small sample sizes, and selection biases, which future researchers should consider when designing and evaluating their own interventions.
Research limitations/implications
These findings highlight the importance of including psychosocial components in interventions designed to increase breakfast consumption, while also signalling issues that should be addressed when designing and reporting future interventions.
Originality/value
This review was the first to investigate the efficacy of interventions aimed at increasing breakfast consumption. The identification of weaknesses in the current body of research, and of successful and unsuccessful intervention practices is an important step in developing successful interventions in the future.
Details
Keywords
Mojisola D. Kupolati, Una E. MacIntyre and Gerda J. Gericke
The aim of this review is to critically assess published articles on school-based nutrition education (NE) intervention to identify factors hindering or contributing to the…
Abstract
Purpose
The aim of this review is to critically assess published articles on school-based nutrition education (NE) intervention to identify factors hindering or contributing to the success of interventions. School-based NE possesses the capacity to influence learners’ nutrition behaviours.
Design/methodology/approach
An electronic search of articles was conducted in Medline, PubMed, the Cumulative Index to Nursing and Allied Health Literature databases, Google and snowballing. Included in the review were school-based studies with classroom NE with or without nutrition services and studies published between 2000 and 2013. School-based non-intervention studies and interventions that did not include a nutrition teaching component were excluded in the review.
Findings
Thirty-nine studies met the inclusion criteria. Features of successful NE interventions included the use of behavioural theories, especially the social cognitive theory and the involvement of trained teachers in the implementation of interventions. Capacity development for teachers, time constraints, school policies and implementation problems of multicomponent interventions were some of the identified challenges encountered in the studies reviewed.
Originality/value
Trained teachers are invaluable assets in interventions to improve nutrition behaviours of learners. Challenges associated with teacher-oriented school-based NE intervention can be overcome by properly designed and implemented interventions based on behavioural theory.