Design for pre-bond testability in 3D integrated circuits

In this dissertation we propose several DFT techniques specific to 3D stacked IC systems. The goal has explicitly been to create techniques that integrate easily with existing IC test systems. Specifically, this means utilizing scan- and wrapper-based techniques, two foundations of the digital IC test industry. First, we describe a general test architecture for 3D ICs. In this architecture, each tier of a 3D design is wrapped in test control logic that both manages tier test pre-bond and integrates the tier into the large test architecture post-bond. We describe a new kind of boundary scan to provide the necessary test control and observation of the partial circuits, and we propose a new design methodology for test hardcore that ensures both pre-bond functionality and post-bond optimality. We present the application of these techniques to the 3D-MAPS test vehicle, which has proven their effectiveness. Second, we extend these DFT techniques to circuit-partitioned designs. We find that boundary scan design is generally sufficient, but that some 3D designs require special DFT treatment. Most importantly, we demonstrate that the functional partitioning inherent in 3D design can potentially decrease the total test cost of verifying a circuit. Third, we present a new CAD algorithm for designing 3D test wrappers. This algorithm co-designs the pre-bond and post-bond wrappers to simultaneously minimize test time and routing cost. On average, our algorithm utilizes over 90% of the wires in both the pre-bond and post-bond wrappers. Finally, we look at the 3D vias themselves to develop a low-cost, high-volume pre-bond test methodology appropriate for production-level test. We describe the shorting probes methodology, wherein large test probes are used to contact multiple small 3D vias. This technique is an all-digital test method that integrates seamlessly into existing test flows. Our experimental results demonstrate two key facts: neither the large capacitance of the probe tips nor the process variation in the 3D vias and the probe tips significantly hinders the testability of the circuits. Taken together, this body of work defines a complete test methodology for testing 3D ICs pre-bond, eliminating one of the key hurdles to the commercialization of 3D technology.PhDCommittee Chair: Lee, Hsien-Hsin; Committee Member: Bakir, Muhannad; Committee Member: Lim, Sung Kyu; Committee Member: Vuduc, Richard; Committee Member: Yalamanchili, Sudhaka

Paper Session I-C - Manned Industrial Space Soonest

This paper, Manned Industrial Space Soonest, received its title as a take-off on the acronym MISS which stood for Man In Space Soonest. The new generation in space will be primarily concerned with development instead of exploration. We must reconsider our preconceived ideas. For instance, expendable versus reusable spacecraft does not have to mean nonreusable versus reusable launch vehicles. Reusable does not have to connote reentry, recovery, refurbish and refly. A vehicle can be designed or even modified from a conventional expendable to launch a space station or platform in a single flight and even supply a space glider to serve as an emergency lifeboat or to return materials processed in space

BIOMECHANICS AND MOVEMENT PATTERN DEFICITS IN RUNNERS ON THE SAME UNIVERSITY TEAM: IMPLICATIONS FOR PREVENTATIVE SPORT HEALTHCARE

We sought to describe running kinematics and movement patterns in a university cross country team with relevance to injury prevention. During pre-participation physical examinations, 27 runners underwent Functional Movement ScreenTM (FMS) and motion analysis of running kinematics [bilateral knee flexion (KFLEX) and ankle dorsiflexion (ADF) at initial contact, and hip adduction (HADD), contralateral pelvis drop (CPD), KFLEX, rearfoot eversion (REV), and ADF at midstance]. Results of HADD (Left 10.5 ± 3.80, Right 11.2 ± 5.20), CPD (Left -7.1 ± 2.80, Right -6.0 ± 2.10) and REV (Right 4.4 ± 3.90, Left 5.0 ± 4.00) at midstance and FMS (13.7 ± 2.4) indicate the need for team based injury prevention. Sport healthcare providers in team settings may benefit from these analyses

Raising the Bar — Integrating Cultural Competence and Equity: Equitable Evaluation – With 2024 Prologue

Editor’s Note: This article, first published in print and online in 2014, has been republished by The Foundation Review with minor updates. Whether implicit or explicit, social justice and human rights are part of the mission of many philanthropies. Evaluation produced, sponsored, or consumed by these philanthropies that doesn’t pay attention to the imperatives of cultural competency may be inconsistent with their missions. The American Evaluation Association’s Statement on Cultural Competence provides those who produce, sponsor, and use evaluation an opportunity to examine and align their practices and policies within a context of racial and cultural equity and inclusion. The use of such a lens is paramount when evaluating a program whose goals touch on issues of equity or inclusion. This article seeks to open a discussion of how philanthropy can use an equitable-evaluation approach to apply the principles of the AEA statement, present the concept of equitable evaluation alongside an approach for building equitable-evaluation capacity, and apply equitable-evaluation capacity building to philanthropy

Raising the Bar – Integrating Cultural Competence and Equity: Equitable Evaluation

· Whether implicit or explicit, social justice and human rights are part of the mission of many philanthropies. Evaluation produced, sponsored, or consumed by these philanthropies that doesn’t pay attention to the imperatives of cultural competency may be inconsistent with their missions. · The American Evaluation Association’s Statement on Cultural Competence provides those who produce, sponsor, and use evaluation an opportunity to examine and align their practices and policies within a context of racial and cultural equity and inclusion. The use of such a lens is paramount when evaluating a program whose goals touch on issues of equity or inclusion. · This article seeks to open a discussion of how philanthropy can use an equitable-evaluation approach to apply the principles of the AEA statement, present the concept of equitable evaluation alongside an approach for building equitable-evaluation capacity, and apply equitableevaluation capacity building to philanthropy

Predicting the resistance of fired clay bricks to salt attack

The salt attack of Fired Clay Bricks (FCBs) causes surface damage that is aesthetically displeasing and eventually leads to structural damage. Methods for determining the resistances of FCBs to salt weathering have mainly tried to simulate the process by using accelerating aging tests. Most research in this area has concentrated on the types of salt that can cause damage and the damage that occurs during accelerated aging tests. This approach has lead to the use of accelerated aging tests as standard methods for determining resistance. Recently, it has been acknowledged that are not the most reliable way to determine salt attack resistance for all FCBs in all environments. Few researchers have examined FCBs with the aim of determining which material and mechanical properties make a FCB resistant to salt attack. The aim of this study was to identify the properties that were significant to the resistance of FCBs to salt attack. In doing so, this study aids in the development of a better test method to assess the resistance of FCBs to salt attack. The current Australian Standard accelerated aging test was used to measure the resistance of eight FCBs to salt attack using sodium sulfate and sodium chloride. The results of these tests were compared to the water absorption properties and the total porosity of FCBs. An empirical relationship was developed between the twenty-four-hour water absorption value and the number of cycles to failure from sodium sulfate tests. The volume of sodium chloride solution was found to be proportional to the total porosity of FCBs in this study. A phenomenological discussion of results led to a new mechanism being presented to explain the derivation of stress during salt crystallisation of anhydrous and hydratable salts. The mechanical properties of FCBs were measured using compression tests. FCBs were analysed as cellular materials to find that the elastic modules of FCBs was equivalent for extruded FCBs that had been fired a similar temperatures and time. Two samples were found to have significantly different elastic moduli of the solid microstructure. One of these samples was a pressed brick that was stiffer due to the extra bond that is obtained during sintering a closely packed structure. The other sample was an extruded brick that had more firing temperature and time compared with the other samples in this study. A non-destructive method was used to measure the indentation hardness and indentation stress-strain properties of FCBs. The indentation hardness of FCBs was found to be proportional to the uniaxial compression strength. In addition, the indentation hardness had a better linear correlation to the total porosity of FCBs except for those samples that had different elastic moduli of the solid microstructure. Fractography of exfoliated particles during salt cycle tests and compression tests showed there was a similar pattern of fracture during each failure. The results indicate there were inherent properties of a FCB that determines the size and shape of fractured particles during salt attack. The microstructural variables that determined the fracture properties of FCBs were shown to be important variables to include in future models that attempt to estimate the resistance of FCBs to salt attack

Informing the design of a randomised controlled trial of an exercise-based programme for long term stroke survivors: lessons from a before-and-after case series study

Background: To inform the design of a randomised controlled trial (RCT) of an exercise-based programme for long term stroke survivors, we conducted a mixed methods before-and-after case series with assessment at three time points. We evaluated Action for Rehabilitation from Neurological Injury (ARNI), a personalised, functionally-focussed programme. It was delivered through 24 hours of one-to-one training by an Exercise Professional (EP), plus at least 2 hours weekly unsupervised exercise, over 12- 14 weeks. Assessment was by patient-rated questionnaires addressing function, physical activity, confidence, fatigue and health-related quality of life; objective assessment of gait quality and speed; qualitative individual interviews conducted with participants. Data were collected at baseline, 3 months and 6 months. Fidelity and acceptability was assessed by participant interviews, audit of participant and EP records, and observation of training. Findings: Four of six enrolled participants completed the exercise programme. Quantitative data demonstrated little change across the sample, but marked changes on some measures for some individuals. Qualitative interviews suggested that small benefits in physical outcomes could be of great psychological significance to participants. Participant-reported fatigue levels commonly increased, and non-completers said they found the programme too demanding. Most key components of the intervention were delivered, but there were several potentially important departures from intervention fidelity. Discussion: The study provided data and experience that are helping to inform the design of an RCT of this intervention. It suggested the need for a broader recruitment strategy; indicated areas that could be explored in more depth in the qualitative component of the trial; and highlighted issues that should be addressed to enhance and evaluate fidelity, particularly in the preparation and monitoring of intervention providers. The experience illustrates the value of even small sample before-and-after studies in the development of trials of complex interventions.PenCLAHRC; NIH

Carbon Monoxide-Dependent Chemolithotrophic Growth of Clostridium thermoautotrophicum

The acetogen Clostridium thermoautotrophicum was cultivated under CO-dependent chemolithotrophic conditions. CO-dependent growth profiles and energetics indicated that supplemental CO2 was fundamental to efficient growth at the expense of CO. Overall product stoichiometry approximated 6.5CO --\u3e CH3CO2H + 3.5CO2 + 0.6 cell C + 0.5 unrecovered C. Initial CO/CO2 ratios of 2 to 4 yielded optimal doubling times and cell yields. Maximal YCO values approximated 2.5 g of cell dry weight per mol of CO consumed; Y H2 , was considerably lower than Y CO Cross-transfer growth experiments and protein profiles indicated differential expression of genes between CO and methanol cultures