Statistical analysis of stencil technology for wafer-level bumping

2014 ◽  
Vol 26 (2) ◽  
pp. 71-78
Author(s):  
Robert W. Kay ◽  
Gerard Cummins ◽  
Thomas Krebs ◽  
Richard Lathrop ◽  
Eitan Abraham ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Design Guidelines ◽  
Solder Paste ◽  
Wafer Level ◽  
Stencil Printing ◽  
Content Type ◽  
Bump Height ◽  
Box Plots ◽  
The Impact ◽  
Insight Into

Purpose – Wafer-level stencil printing of a type-6 Pb-free SAC solder paste was statistically evaluated at 200 and 150 μm pitch using three different stencil manufacturing technologies: laser cutting, DC electroforming and micro-engineered electroforming. This investigation looks at stencil differences in printability, pitch resolution, maximum achievable bump height, print co-planarity, paste release efficiency, and cleaning frequency. The paper aims to discuss these issues. Design/methodology/approach – In this paper, the authors present a statistical evaluation of the impact of stencil technology on type-6 tin-silver-copper paste printing. The authors concentrate on performances at 200 and 150 μm pitch of full array patterns. Key evaluated criteria include achievable reflowed bump heights, deposit co-planarity, paste release efficiency, and frequency of stencil cleaning. Box plots were used to graphically view print performance over a range of aperture sizes for the three stencil types. Findings – Fabrication technologies significantly affect print performance where the micro-engineered electroformed stencil produced the highest bump deposits and the lowest bump height deviation. Second in performance was the conventional electroformed, followed by the laser-cut stencil. Comparisons between the first and fifth consecutive print demonstrated no need for stencil cleaning in the case for the micro-engineered stencil for all but the smallest spacings between apertures. High paste transfer efficiencies, i.e. above 85 per cent, were achieved with the micro-engineered stencil using low aperture area ratios of 0.5. Originality/value – Stencil technology influences the maximum reflowed solder bump heights achievable, and bump co-planarity. To date, no statistical analysis comparing the impact of stencil technology for wafer-level bumping has been carried out for pitches of 200 μm and below. This paper gives new insight into how stencil technology impacts the print performance for fine pitch stencil printing. The volume of data collected for this investigation enabled detailed insight into the limitations of the printing process and as a result for suitable design guidelines to be developed. The finding also shows that the accepted industry guidelines on stencil design developed by the surface mount industry can be broken if the correct stencil technology is selected, thereby increasing the potential application areas of stencil printing.

What makes court-referred mediation effective?

2014 ◽  
Vol 25 (1) ◽  
pp. 21-37 ◽  
Author(s):  
Amira Galin
Keyword(s):  
Design Methodology ◽  
Content Type ◽  
Process And Outcome ◽  
Refusal To Participate ◽  
The Impact ◽  
Practical Implications ◽  
Theoretical Insight ◽  
Insight Into ◽  
Low Rate

Purpose – The purpose of this paper is to obtain insight into court-referred mediation in the Israeli Labor Courts, by analyzing its processes and outcomes, as a function of tactics used by both the disputants and the mediator. Design/methodology/approach – Observation of 103 court-referred mediations, for each of which a detailed process and outcome were documented. Data on disputants' refusal to participate in the mediation was also collected. At the end of each mediation case, disputants were given a questionnaire in which they expressed their satisfaction with the outcome and their evaluation of the mediator's contribution. Findings – A low rate of refusal to participate in court-referred mediation was found. Also, the higher the ratio of soft tactics to pressure tactics employed (by all parties involved) during the process, the higher the rate of agreements. Mediators use significantly more soft tactics than disputants, and are more active in using tactics. The two significant variables that predict the mediation's agreement are the ratio between soft tactics to pressure tactics used by all parties, and mediator contribution to the process. Practical implications – The significant role of soft tactics in the process, outcome, and satisfaction of court-referred mediation may serve as a guideline for disputants and mediators. Originality/value – This unique research, which examines the impact of tactics on court-referred mediation, may provide added and significant theoretical insight into its process and outcome, as well as a better understanding of other “hybrid” (compulsory at the beginning, voluntary at the end) mediations.

The impact of quality management practices on knowledge management processes: a study of a social security corporation in Jordan

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ata Al Shraah ◽  
Ayman Abu-Rumman ◽  
Faisal Al Madi ◽  
Fawwaz Ali Farhan Alhammad ◽  
Ayah Ahmad AlJboor
Keyword(s):  
Knowledge Management ◽  
Statistical Analysis ◽  
Quality Management ◽  
Social Security ◽  
Management Practices ◽  
Content Type ◽  
Quality Management Practices ◽  
Management Processes ◽  
The Impact ◽  
General Director

PurposeThis study aimed to investigate the impact of total quality practices on knowledge management (KM) processes across a Social Security Corporation (SSC) in Jordan and explore the best approach to improve KM processes using quality management.Design/methodology/approachThis study followed a quantitative methodology: a conceptual model was developed based on an extensive review of the related literature; an online survey was developed and distributed using the SSC's intranet; and 384 surveys were completed and used in the statistical analysis. The two-stage approach of structural equation modeling (SEM) was employed to analyze and interpret the data, and was used to validate the conceptual model of this research.FindingsBased on the statistical analysis it was found that six out of seven independent factors relating to quality management practices were confirmed to have a significant impact on the knowledge management processes (KMPs). Building upon the findings an agenda for improving KM processes using quality management is proposed.Originality/valueThis study was conducted in one organization namely the SSC because it is the largest public service organization in Jordan and offers compulsory services. The inclusion of other public organizations and companies may reflect different findings. Future research may collect data from other service industries to get a more comprehensive perspective from developing countries such as Jordan. Moreover, the population of this study included only the General Director, General Director Assistants, and Administrative Managers. Front-line employees were excluded from the data collection because the study was conducted solely from a managerial perspective.

scholarly journals Statistically, Does peer assisted learning make a difference on a UK engineering degree programme? HETL Scotland 2017

2019 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Anne Louise Nortcliffe ◽  
Sajhda Parveen ◽  
Cathy Pink-Keech
Keyword(s):  
Academic Performance ◽  
Statistical Analysis ◽  
Positive Impact ◽  
Data Sets ◽  
Social Categories ◽  
Peer Assisted Learning ◽  
Student Records ◽  
Content Type ◽  
Attainment Gap ◽  
The Impact

Purpose Black British minority ethnics (BME) students are nationally underachieving in comparison to their Ethnic Chinese and White peers, showing typically a 16 per cent graduate attainment gap in the UK. Previous research has suggested that the attainment gap could be explained by BME student disengagement, as the students typically commute from family home to University, and they work part time. However, peer-assisted learning (PAL) has been shown to have a positive impact on addressing and resolving student alienation and disengagement. However, a question still remains regarding whether student perceptions hold up to statistical analysis when scrutinised in comparison to similar cohorts without PAL interventions. The paper aims to discuss these issues. Design/methodology/approach This paper presents the results of a statistical study for two cohorts of students on engineering courses with a disproportionately high representation of BME students. The research method involved a statistical analysis of student records for the two cohorts to ascertain any effect of correlation between: PAL; student ethnicity; and student parental employment on student academic performance and placement attainment. Findings The results indicate that PAL has no significant impact on the academic performance; however, PAL has a positive impact on the placement/internship attainment for BME students and students from parental households with parents in non-managerial/professional employment. Research limitations/implications The research limitations are that the cohorts are small, but more equal diverse mix of different social categories than any other courses. However, as the cohorts are less than 30 students, comparing social categories the data sets are small to have absolute confidence in the statistical results of academic performance. Even the t-test has its limitations as the subjects are human, and there are multiple personal factors that can impact an individual academic performance; therefore, the data sets are heterostatic. Practical implications The results highlight that there is need for pedagogy interventions to support: ideally all BME students from all social categery to secure placements; BME students who are unable to go on placement to gain supplementary learning that has the same impact on their personal development and learning as placement/internship experience; and White students from managerial/professional family households to engage more in their studies. Social implications Not addressing and providing appropriate pedagogy interventions, in the wider context not addressing/resolving the BME academic and placement attainment gap, a set of students are being disadvantaged to their peers through no fault of their own, and compounding their academic attainment. As academics we have a duty to provide every opportunity to develop our student attainment, and as student entry is generally homogeneous, all students should attain it. Originality/value Previous research evaluation of PAL programmes has focused on quantitative students surveys and qualitative semi-structured research interviews with students on their student engagement and learning experience. On the other hand, this paper evaluates the intervention through conducting a quantitative statistical analysis of the student records to evaluate the impact of PAL on a cohort’s performance on different social categories (classifications) and compares the results to a cohort of another group with a similar student profile, but without PAL intervention implementation.

Optimising pin-in-paste technology using gradient boosted decision trees

2018 ◽  
Vol 30 (3) ◽  
pp. 164-170 ◽  
Author(s):  
Péter Martinek ◽  
Oliver Krammer
Keyword(s):  
Decision Tree ◽  
Prediction Method ◽  
Percentage Error ◽  
Solder Paste ◽  
Hole Filling ◽  
Decision Tree Learning ◽  
Stencil Printing ◽  
Content Type ◽  
Learning Techniques ◽  
Through Hole

Purpose This paper aims to present a robust prediction method for estimating the quality of electronic products assembled with pin-in-paste soldering technology. A specific board quality factor was also defined which describes the expected yield of the board assembly. Design/methodology/approach Experiments were performed to obtain the required input data for developing a prediction method based on decision tree learning techniques. A Type 4 lead-free solder paste (particle size 20–38 µm) was deposited by stencil printing with different printing speeds (from 20 mm/s to 70 mm/s) into the through-holes (0.8 mm, 1 mm, 1.1 mm, 1.4 mm) of an FR4 board. Hole-filling was investigated with X-ray analyses. Three test cases were evaluated. Findings The optimal parameters of the algorithm were determined as: subsample is 0.5, learning rate is 0.001, maximum tree depth is 6 and boosting iteration is 10,000. The mean absolute error, root mean square error and mean absolute percentage error resulted in 0.024, 0.03 and 3.5, respectively, on average for the prediction of the hole-filling value, based on the printing speed and hole-diameter after optimisation. Our method is able to predict the hole-filling in pin-in-paste technology for different through-hole diameters. Originality/value No research works are available in current literature regarding machine learning techniques for pin-in-paste technology. Therefore, we decided to develop a method using decision tree learning techniques for supporting the design of the stencil printing process for through-hole components and pin-in-paste technology. The first pass yield of the assembly can be enhanced, and the reflow soldering failures of pin-in-paste technology can be significantly reduced.

scholarly journals The impact of blame culture on paramedic practice

2018 ◽  
Vol 7 (3) ◽  
pp. 214-227
Author(s):  
Andrew Kirk ◽  
Kevin Armstrong ◽  
Niina Nurkka ◽  
Annette Jinks
Keyword(s):  
Medical Profession ◽  
Clinical Care ◽  
Content Type ◽  
The Public ◽  
Inappropriate Use ◽  
Blame Culture ◽  
Working Practices ◽  
Use Of Social Media ◽  
The Impact ◽  
Insight Into

Purpose The purpose of this paper is to explore English and Finnish paramedic perceptions of the healthcare blame culture, its relationship to complaints, the use of defensive practice and if this impacts on paramedic practice and clinical care. Design/methodology/approach Participants were recruited from English and Finnish ambulance services that have similar organisational and professional scopes of practice. The aim was to gain insight into the similarities and differences between the countries regarding the existence of a blame culture in paramedic practice. Semi-structured focus groups and interviews involving 20 English and Finnish paramedics were undertaken. Qualitative perceptions concerning the reality of a blame culture in paramedic practice and its impact on professional roles were sought. Findings Three major themes that were identified in the thematic analysis included: blame culture and its influences; the impact of complaints against paramedics; and the use of defensive practice within their roles. These data themes were similar for both groups of participants. The majority of participants thought the healthcare blame culture to be widespread and believed that this was likely to directly influence paramedics’ working practices. Originality/value Whilst the impact of blame culture and complaints on the medical profession has previously been examined, this study makes an important contribution by exploring the factors that impact on paramedics’ lives and their practice, within two European countries. The inappropriate use of social media by some members of the public in both countries was a disturbing issue for many participants and was identified as an area for further research.

The failure of non‐binding declarations to achieve university sustainability

2007 ◽  
Vol 8 (3) ◽  
pp. 301-316 ◽  
Author(s):  
S.A. Bekessy ◽  
K. Samson ◽  
R.E. Clarkson
Keyword(s):  
Best Practice ◽  
Small Scale ◽  
Structured Interviews ◽  
Pilot Studies ◽  
Content Type ◽  
Institute Of Technology ◽  
University Leaders ◽  
The University ◽  
The Impact ◽  
Insight Into

PurposeThis paper aims to assess the impact and value of non‐binding agreements or declarations in achieving sustainability in universities.Design/methodology/approachA case study of Royal Melbourne Institute of Technology (RMIT) University is presented, analysing the reasons for lack of progress towards sustainability and evaluating best ways forward. Using a timeline and analysis of historical records for the 12 years since RMIT first engaged in the sustainability agenda, major trends in the process of implementing policies are identified. Secondly, 15 semi‐structured interviews with university leaders and key sustainability stakeholders from across the university are analysed to provide insight into how and why the university has failed to achieve sustainability.FindingsNew implications for successfully achieving sustainability arise from these findings. Accountability is a key issue, as RMIT appears to reap benefits from being signatory to declarations without achieving genuine progress. To ensure that declarations are more than simply greenwash, universities must open themselves up to scrutiny of progress to determine whether commitments have been honoured.Practical implicationsRelying on small‐scale “club” activities establishing demonstrations and raising awareness is unlikely to lead to permanent change. The evidence of RMIT's engagement with sustainability shows that, for example, even when successful pilot studies are conducted, these initiatives may do little to affect the mainstream practices of a university unless certain conditions exist. Furthermore, given the on‐paper commitments institutions have made, and the role of the university in society, small‐scale and gradual changes in university practice are a far from adequate response to the urgent sustainability imperative.Originality/valueThe initial engagement of RMIT University with the sustainability agenda 12 years ago marked it as a world leader in sustainability best‐practice. Analysing how and why such a disappointing lack of action has resulted from such promising beginnings provides insight into future directions for implementing sustainability in universities. The paper argues that considering the key responsibility of universities in leading the sustainability agenda, a more systemic and serious response is required.

scholarly journals The impact of COVID-19 pandemic on conventional work settings

2020 ◽  
Vol 40 (9/10) ◽  
pp. 909-927
Author(s):  
Randa Diab-Bahman ◽  
Abrar Al-Enzi
Keyword(s):  
Working Conditions ◽  
Good Practice ◽  
Data Gathering ◽  
Phenomenological Approach ◽  
Future Research ◽  
Crowd Sourcing ◽  
Policy Makers ◽  
Content Type ◽  
The Impact ◽  
Insight Into

PurposeTo give insight into human resource (HR) policy makers of the impact of the abrupt change in working conditions as reported from their primary stakeholders – the employees.Design/methodology/approachReported from a first-person point of view, 192 employees from Kuwait who are currently working from home were surveyed as to how the lockdown circumstances have impacted their conventional work expectations. The study compares the old working conditions (OWC) to the current working conditions (CWC) to give insight into the overall sentiments of the abrupt changes to the workplace.FindingsIt was found that most employees agreed that OWC need to be reviewed, and that the general sentiment was almost equally split on the efficiency of CWC in comparison to OWC, yet the majority was enjoying the flexible conditions. Moreover, the majority of respondents found that overall conventional work elements either remained the same or had been impacted positively rather than negatively. Also, if given an option of a hybrid model inclusive of partly working remotely and partly working on-site, a considerable majority reported that they are able to efficiently conduct atleast 80% of their work expectation. Finally, it was found that employee expectation is changing as they consider post COVID-19 conditions.Research limitations/implicationsThis research was conducted using virtual crowd-sourcing methods to administer the survey and may have been enhanced should other methods have been integrated for data gathering. Also, a more comprehensive phenomenological approach could have been incorporated to add a qualitative method to the investigation. This could have freed the results of answer limitation and experience bias. Moreover, it is good practice to involve both quantitative and qualitative elements to any research when possible. Finally, future research can benefit from a bigger pool of participants so as to gain a clearer picture.Originality/valueThis research will give policy makers a look at what needs to be reviewed/changed for a successful roll-out of remote work in accordance with their original strategies.

Using SEM-PLS to assess users satisfaction of library service quality: evidence from Malaysia

2019 ◽  
Vol 40 (3/4) ◽  
pp. 240-250 ◽  
Author(s):  
Sahar Hosseinikhah Choshaly ◽  
Marva Mirabolghasemi
Keyword(s):  
User Satisfaction ◽  
Structural Model ◽  
Positive Impact ◽  
Measurement Model ◽  
Information Control ◽  
Content Type ◽  
Library Users ◽  
The Impact ◽  
Library User ◽  
Insight Into

Purpose The purpose of this paper is to examine the impact of Libqual+™ dimension (affect of services, information control and Library as a place) on user satisfaction at Universiti Kebangsaan Malaysia (UKM). Design/methodology/approach Data were collected using a sample of 100 students and it was analyzed using SPSS and SmartPLS. The measurement model was analyzed using composite reliability, convergent and discriminate validity while the structural model was used to predict the relationships between variables. Findings The results indicated that services, information control and library as a place have a significant and positive impact on the overall satisfaction of library users, with affect of services being the most important predictor of library user satisfaction. Practical implications Overall, users are satisfied with the services provided by the UKM library. Results from this study will help librarians to make better decisions in providing effective services and fulfilling the library’s vision and mission. Originality/value The study provides insight into the UKM University how to use LibQual+™ dimension to improve user’s satisfaction.

Drivers of intention to use Murabaha financing: religiosity as moderator

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Naqeeb Ullah Atal ◽  
Mohammad Iranmanesh ◽  
Fathyah Hashim ◽  
Behzad Foroughi
Keyword(s):  
Social Influence ◽  
Reasoned Action ◽  
Intention To Use ◽  
Content Type ◽  
The Impact ◽  
Positive Effect ◽  
Moderating Role ◽  
Insight Into ◽  
Religious Obligation

Purpose The purpose of this paper is to investigate the determinants of Muslims’ attitude and intention towards Murabaha financing by considering religiosity as a moderator. Design/methodology/approach The data were collected through a survey of 373 Muslims in Afghanistan and were analysed using the partial least squares technique. Findings The results showed that social influence and religious obligation have a positive effect on attitude towards Murabaha financing. Furthermore, social influence and attitude have a positive effect on the intention to use Murabaha financing. Religiosity moderates negatively the impact of social influence on attitude towards Murabaha financing. Practical implications Managers and marketers of Islamic banks may benefit from the findings of this study, which provide insight into the factors that should be considered to promote Murabaha financing. Originality/value The findings contribute to the literature on Islamic financing products by demonstrating the drivers of attitude towards and intention to use Murabaha financing. The study also extends the literature by testing the moderating role of religiosity. Furthermore, the study extends the theory of reasoned action in the context of Islamic financing by introducing religious obligation as a potential driver of attitude and religiosity as a moderator.

The impact of extreme weather on mass-participation sporting events

2019 ◽  
Vol 10 (2) ◽  
pp. 95-109
Author(s):  
Julia Kathryn Giddy
Keyword(s):  
Best Practice ◽  
Weather Conditions ◽  
Extreme Weather ◽  
Survey Method ◽  
Sporting Events ◽  
Content Type ◽  
Sport Events ◽  
Mass Participation ◽  
The Impact ◽  
Insight Into

Purpose The purpose of this paper is to investigate the impact of extreme weather on tourism events through the perceptions of participants, using the case of the 2017 Cape Town Cycle Tour (CTCT). Design/methodology/approach This study utilized a survey method to collect data. Questionnaires were distributed online to would-be participants in the cancelled 2017 CTCT. The questionnaire included both fixed-response and open-ended questions. Findings The results show that participants experienced mixed emotions to event cancellation. Most felt that the weather conditions warranted cancellation, but some concerns emerged as to how the cancellation was managed. In addition, many felt that the organization of the race needs to be rethought due to numerous negative weather experiences in recent years. Research limitations/implications The findings in this study are exploratory. They focus on a single event in one city. However, they provide important initial insight into how sporting event participants react to the negative impacts of extreme weather. Practical implications These results have important management implications in addressing the impact of weather on the events sector. They are significant in understanding best practice with regard to managing participants in the case of weather impacts on an event. They also demonstrate interesting results with regard to participant loyalty among active sport events tourists. Originality/value The originality of this study is in its extension of the broad discussion of the impact of extreme weather and climate change on tourism to the events sector. The implications of changing weather and climatic patterns on events, particularly mass-participation sporting events, are clear and need to be considered in order to effectively manage future impacts on this important economic sector. This is done by providing insight into how participants respond to these types of circumstances.

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