ScalaTrace: Scalable compression and replay of communication traces for high-performance computing

Characterizing the communication behavior of large-scale applications is a difficult and costly task due to code/system complexity and long execution times. While many tools to study this behavior have been developed, these approaches either aggregate information in a lossy way through high-level statistics or produce huge trace files that are hard to handle.     

Predicting field of job entry from expressed vocational choice and certainty level.

Examined the predictability of actual jobs from expressed vocational choices and confidence in those choices. Ss were 1,994 members of a nationwide study of high school student career development who were working more than half time 3 yrs later. Both choices and occupations were categorized into Holland-type job clusters; analyses involved the use of weighted hit rates and coefficient kappa. Expressed vocational choices correctly predicted actual occupations 2 yrs after high school for 38% of the sample. Hit rates for males and females were 40 and 35%, respectively. When certainty level was added to expressed choice, hit rates were 43% for sure choosers, 38% for fairly sure choosers, and 28% for choosers who were not sure. Each choice level was significantly different from the others. (18 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of mechanical loading on the tuning of acoustic resonances in Ba<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript>Sr<Subscript>1−<Emphasis Type="Italic">x</Emphasis></Subscript>TiO<Subscript>3</Subscript> thin films

The effect of mechanical loading on the tuning performance of a tunable Thin Film Bulk Acoustic Wave Resonator (TFBAR) based on a Ba_0.3Sr_0.7TiO₃ (BST) thin film has been investigated experimentally and theoretically. A membrane-type TFBAR was fabricated by means of micromachining. The mechanical load on the device was increased stepwise by evaporating SiO₂ on the backside of the membrane. The device was electrically characterized after each evaporation step and the results were compared to those obtained from modeling. The device with the smallest mechanical load exhibited a tuning of − 2.4% and − 0.6% for the resonance and antiresonance frequencies at a dc electric field of 615 kV/cm, respectively. With increasing mechanical load a decrease in the tuning performance was observed. This decrease was rather weak if the thickness of the mechanical load was smaller or comparable to the thickness of the active BST film. If the thickness of the mechanical load was larger than the thickness of the active BST layer, a significant reduction in the tuning performance was observed. The weaker tuning of the antiresonance frequency was due to a reduced tuning of the sound velocity of the BST layer with increasing dc bias. The resonance frequency showed a reduced tuning due to a decrease in the effective electromechanical coupling factor of the device with increasing mechanical load. With the help of the modeling we could de-embed the intrinsic tuning performance of a single, non-loaded BST thin film. We show that the tuning performance of the device with the smallest mechanical load we fabricated is close to the intrinsic tuning characteristics of the BST layer.     

A METHOD FOR ANALYZING GEOTHERMAL GRADIENT HISTORIES USING THE STATISTICAL ASSESSMENT OF UNCERTAINTIES IN MATURITY MODELS

A major factor contributing to uncertainty in basin modelling is the determination of the parameters necessary to reconstruct the basin's thermal history. Thermal maturity modelling is widely used in basin modelling for assessing the exploration risk. Of the available models, the chemical kinetic model Easy%Ro has gained wide acceptance.
In this study, the thermal gradient at five wells in the Danish North Sea is calibrated against vitrinite reflectance using the Easy%Ro model coupled with an inverse scheme in order to perform sensitivity analysis and to assess the uncertainty. The mean squared residual (MSR) is used as a quantitative measure of mismatch between the modelled and measured reflectance values. A 90% confidence interval is constructed for the determined mean of the squared residuals to assess the uncertainty for the given level of confidence. The sensitivity of the Easy%Ro model to variations in the thermal gradient is investigated using the uncertainty associated with scatter in the calibration data. The best thermal gradient (minimum MSR) is obtained from the MSR curve for each well. The aim is to show how the reconstruction of the thermal gradient is related to the control data and the applied model.
The applied method helps not only to determine the average thermal gradient history of a basin, but also helps to investigate the quality of the calibration data and provides a quick assessment of the uncertainty and sensitivity of any parameter in a forward deterministic model.     

Validity of diverse procedures for reporting interest scores: An analysis of longitudinal data.

Compared the criterion-related validity of 4 procedures for reporting the results of interest inventories measuring basic types of interests. For each of the reporting procedures (raw scores, combined-sex, same-sex, and opposite-sex norms), the correspondence between the high-point interest codes and actual criterion group membership was determined. Two samples were involved. One consisted of 2,594 community college students who took the Vocational Interest Profile in 1970 and were surveyed in 1975. The other consisted of 1,825 college-bound high school students who took the American College Testing Interest Inventory in 1972 and were surveyed 3 yrs later. The criterion-related validity of scores based on same-sex norms is as high as or higher than that of the other procedures for both males and females. A significant characteristic of reports based on same-sex norms is that they suggest similar vocational options to males and females, whereas the other reporting procedures typically suggest options traditional for a person's sex. Implications for counselors are noted. (19 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

DC bias-dependent shift of the resonance frequencies in BST thin film membranes

Direct current (DC) bias-dependent acoustic resonance phenomena have been observed in micromachined tunable thin film capacitors based on Ba(0.3)Sr(0.7)TiO3 (BST) thin films. The antiresonance frequency is only weakly DC bias dependent, and the resonance frequency exhibits a much stronger dependence on the applied DC bias. The resonance frequency shifted by 1.2% for a frequency of about 6.7 GHz and an applied field of 667 KV/cm. At the same time the effective electromechanical coupling constant k(2)(t,eff) increased to 2.0%. The tuning of the resonance frequency depends on the tunability of the film permittivity and on the mechanical load on the piezoactive layer. The experimental observations correlate well with the theoretical predictions derived from the free energy P expansion using Landau theory.