scholarly journals Die Attach Machine Selection for Glue Voids Reduction Performance

2020 ◽  
pp. 1-5
Author(s):  
Edwin Graycochea Jr. ◽  
Rennier Rodriguez ◽  
Frederick Ray Gomez ◽  
Bryan Christian Bacquian
Keyword(s):  
Analysis Of Variance ◽  
Machine Selection ◽  
Die Attach ◽  
Selection For ◽  
Critical Requirement ◽  
Two Machines

The paper is focused on the glue voids reduction of quad-flat no-leads (QFN) devices evaluated on different die attach machine platforms. The evaluation was narrowed-down into two main die attach machines with the objective of attaining the best performance in terms of reducing or eliminating the glue voids. Glue voids were quantified and only die attach Machine B was able to satisfy the specification. The study used analysis of variance on the two machines and presented the effect of machine selection on glue voids reduction. For future works, the selected die attach machine could be used for devices with critical requirement.

scholarly journals Die Placement Performance Evaluation on Different Machine Platforms

2021 ◽  
pp. 41-45
Author(s):  
Rennier Rodriguez ◽  
Edwin Graycochea Jr. ◽  
Frederick Ray Gomez
Keyword(s):  
Performance Evaluation ◽  
Critical Design ◽  
Machine Selection ◽  
Die Attach ◽  
Graph Comparison ◽  
Critical Requirement ◽  
Two Machines

The paper focuses on the die placement tolerance capability with critical design for land grid array (LGA) device evaluated on two different die attach machine platforms. The evaluation was narrowed down into two main die attach machines with the objective of attaining the best performance in terms of die placement tolerance capability. Die placement tolerance were quantified and only die attach Machine B was able to satisfy the specification of less than 30 microns. The study used a bar graph comparison in terms of die placement tolerance on the two machines and presented the effect of machine selection on die placement tolerance capability. For future works, the selected die attach machine could be used for devices with critical requirement.

scholarly journals Study of Diebond Machine Platform on Theta Rotation Performance

2021 ◽  
pp. 45-49
Author(s):  
Edwin M. Graycochea Jr. ◽  
Rennier S. Rodriguez ◽  
Frederick Ray I. Gomez
Keyword(s):  
Comparison Analysis ◽  
Critical Design ◽  
Machine Selection ◽  
Critical Machine ◽  
Critical Requirement ◽  
Two Machines

Theta rotation on die during diebond process is one of the critical machine responses especially for land grid array (LGA) device with tight tolerances requirement. The paper focuses on the die theta rotation tolerance capability with critical design for LGA device evaluated on two different diebond machine platforms. The evaluation was narrowed down into two main diebond machines with the objective of attaining the best performance in terms of die theta rotation tolerance capability. The study used a side-by-side comparison analysis in terms of theta rotation on the two machines and presented the effect of machine selection on the theta rotation response. Theta rotation was monitored and both machines satisfied the specification of 1 degree of maximum rotation, though diebond Machine 1 was able to produce a more stable diebonding with only around less than 0.15 degree of theta rotation variation. For future works, the selected diebond machine could be used for devices with critical requirement.

scholarly journals When ANOVA Isn't Ideal: Analyzing Ordinal Data from Practical Work in Biology

2020 ◽  
Vol 82 (5) ◽  
pp. 289-294
Author(s):  
Michael Calver ◽  
Douglas Fletcher
Keyword(s):  
Analysis Of Variance ◽  
Ordinal Data ◽  
Nonparametric Statistics ◽  
Biological Data ◽  
Statistical Analyses ◽  
Practical Work ◽  
Parametric Statistics ◽  
Critical Requirement ◽  
Size Interval ◽  
Biology Laboratory

Data collected in many biology laboratory classes are on ratio or interval scales where the size interval between adjacent units on the scale is constant, which is a critical requirement for analysis with parametric statistics such as t-tests or analysis of variance. In other cases, such as ratings of disease or behavior, data are collected on ordinal scales in which observations are placed in a sequence but the intervals between adjacent observations are not necessarily equal. These data can only be interpreted in terms of their order, not in terms of the differences between adjacent points. They are unsuitable for parametric statistical analyses and require a rank-based approach using nonparametric statistics. We describe an application of one such approach, the Kruskal-Wallis test, to biological data using online freeware suitable for classroom settings.

scholarly journals Variable selection for non-parametric quantile regression via smoothing spline analysis of variance

Stat ◽  
2013 ◽  
Vol 2 (1) ◽  
pp. 255-268 ◽  
Author(s):  
Chen-Yen Lin ◽  
Howard Bondell ◽  
Hao Helen Zhang ◽  
Hui Zou
Keyword(s):  
Variable Selection ◽  
Quantile Regression ◽  
Analysis Of Variance ◽  
Smoothing Spline ◽  
Selection For ◽  
Non Parametric

EFFECT OF SELECTION FOR CARCASS SCORE ON THE GENETIC IMPROVEMENT OF ITS COMPONENTS IN SWINE

1970 ◽  
Vol 50 (3) ◽  
pp. 585-592 ◽  
Author(s):  
M. H. FAHMY ◽  
C. BERNARD
Keyword(s):  
Analysis Of Variance ◽  
Genetic Improvement ◽  
Genetic Correlations ◽  
Feed Utilization ◽  
Backfat Thickness ◽  
Yorkshire Pigs ◽  
Selection For ◽  
Heritability Estimates ◽  
Sole Criterion ◽  
Three Components

Selection for carcass score was practiced for ten generations in two separate lines of Yorkshire pigs. Three components of the score were studied: carcass length, loin eye area, and backfat thickness. In line 2, carcass score was the sole criterion of selection, while in line 3, it was combined with feed utilization into an overall merit. Line 1, selected solely for feed utilization, served as a control. Carcass length and loin eye area increased by approximately 2 and 9%, respectively, in both lines. However, backfat thickness also increased by about 3% in line 2 and 0.4% in line 3. Pooled heritability estimates derived from the analysis of variance and the regression of offspring on mid-parent were 0.64 for carcass length, 0.48 for loin eye area and 0.67 for backfat thickness. Genetic correlations among the components of carcass score, between the components and carcass score and between the components and feed utilization were moderately high and favorable for combined genetic improvement of all traits.

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