179,133 research outputs found
Wireless MIMO Systems Employing Joint Turbo-Like STBC Codes With Bit-Level Algebraically-Interleaved URSCs
No full textIn this paper, permutations constructed based on algebraic derivations which are of particular interests due to better error-rate performance as well as simpler and practical hardware implementations, have been used in designing high performance fully-systematic joint space-time turbo coding technology. This scheme enjoys the integration of twin-/triplet-antenna bit-level space-time (ST) codes with the binary turbo-like codes of unpunctured codecs. The conducted performance evaluations reveal that this scheme has superior flare performance and yields additional coding gains in waterfall region, compared with the row-column block interleaved systems
ASO Author Reflections: Transdiaphragmatic Approach for Simultaneous Resection of Colorectal Liver and Lung Metastases
No full textSimultaneous resection of colorectal cancer, liver and lung metastase
Mehran contrast-induced nephropathy risk score predicts short and long-term clinical outcomes in patients with ST-elevation myocardial infarction
No full textMehran contrast-induced nephropathy risk score predicts short and long-term clinical outcomes in patients with ST-elevation myocardial infarctio
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Usefulness of Adding Pre-procedural Glycemia to the Mehran Score to Enhance Its Ability to Predict Contrast-induced Kidney Injury in Patients Undergoing Percutaneous Coronary Intervention Development and Validation of a Predictive Model
No full textThe Mehran score is the most widely accepted tool for predicting contrast-induced acute kidney injury (CI-AKI), a major complication of percutaneous coronary intervention (PCI). Similarly, abnormal fasting pre-procedural glycemia (FPG) represents a modifiable risk factor for CI-AKI, but it is not included in current risk models for CI-AKI prediction. We sought to analyze whether adding FPG to the Mehran score improves its ability to predict CI-AKI following PCI. We analyzed 671 consecutive patients undergoing PCI (age 69 [63,75] years, 23% females), regardless of their diabetic status, to derive a revised Mehran score obtained by including FPG in the original Mehran score (Derivation Cohort). The new risk model (GlyMehr) was externally validated in 673 consecutive patients (Validation Cohort) (age 69 [62,76] years, 21% females). In the Derivation Cohort, both FPG and the original Mehran score predicted CI-AKI (AUC 0.703 and 0.673, respectively). The GlyMehr score showed a better predictive ability when compared with the Mehran score both in the Derivation Cohort (AUC 0.749, 95%CI 0.662 to 0.836; p = 0.0016) and the Validation Cohort (AUC 0.848, 95%CI, 0.792 to 0.903; p = 0.0008). In the overall population (n = 1344), the GlyMehr score confirmed its independent and incremental predictive ability regardless of diabetic status (p ≤0.0034) or unstable/stable coronary syndromes (p ≤0.0272). In conclusion, adding FPG to the Mehran score significantly enhances our ability to predict CI-AKI. The GlyMehr score may contribute to improve the clinical management of patients undergoing PCI by identifying those at high risk of CI-AKI and potentially detecting modifiable risk factors
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Configurations of polymers attached to probes
No full textWe study polymers attached to spherical (circular) or paraboloidal (parabolic) probes in three (two) dimensions. Both self-avoiding and random walks are examined numerically. The behavior of a polymer of size R[subscript 0] attached to the tip of a probe with radius of curvature R, differs qualitatively for large and small values of the ratio s=R[subscript 0]/R. We demonstrate that the scaled compliance (inverse force constant) S/R[2 over 0], and scaled mean position of the polymer end-point (x[subscript ⊥])/R can be expressed as a function of s. Scaled compliance is anisotropic, and quite large in the direction parallel to the surface when R[subscript 0]~R. The exponent γ, characterizing the number of polymer configurations, crosses over from a value of γ[subscript 1] – characteristic of a planar boundary – at small s to one reflecting the overall shape of the probe at large s. For a spherical probe the crossover is to an unencumbered polymer, while for a parabolic probe we cannot rule out a new exponent.National Science Foundation (U.S.) (Grant DMR-08-03315
Ordering of Curving Interfaces
No full textCurved surfaces are fundamental parts of living systems. This thesis examines how materials can order on curving interfaces, resulting in shape changes and pattern formation. Many phenomena that are well-studied in flat space display new behavior when lifted onto a deformable surface: liquid crystals buckle membranes into peaked shapes, diffusing particles can sense curvature and localize patterns, and anisotropic growth can form branching structures over many scales.
The systems I study include fluid membranes and growing solids. My framework connects the study of liquid crystals to cytoskeletons of living cells, and provides tools for understanding the machinery of vesicles as well as the remodeling of entire cells. Orientational order plays a central role on these surfaces. Topological defects in an orientation field are an area of intense historical and on-going interest. This work was published in a paper with my coauthor and advisor Mehran Kardar.
I show that curvature modifies diffusion and can change the spatial patterns generated by Turing instabilities. Turing patterns have been studied extensively on flat substrates. To lift this patterning mechanism onto the highly curved shapes of living systems, we apply tools from perturbation theory and differential geometry to analytically compute modifications to the Laplacian and its normal modes on curved surfaces. This extends the framework of differential geometry to understand chemical concentrations diffusing on biological interfaces. In this thesis, I expand upon a paper I published with my coauthors Jemal Guven, Mehran Kardar, and Henry Shackleton.
I conclude with initial results from a new cellular automaton of anisotropic solid growth, which generates tree-shaped morphologies. This suggests that branching structures in botanical trees may result from a simple, universal growth process. Topological defects naturally appear at the branch points of these structures in simulations and in nature. By expanding biophysics from its historical focus on the molecular realm to include macroscopic living solids, we may eventually learn to save our global forests and engineer growing structures on Earth and beyond.Ph.D
Letter from R. R. Zellick, Assistant Trust Officer, Anglo California National Bank of San Francisco, to Joseph R. Goodman, October 2, 1942
No full textLetter from R. R. Zellick, Assistant Trust Officer at The Anglo California National Bank of San Francisco, to Joseph R. Goodman, regarding property owned by Dave Tatsuno. Zellick mentions a dispute between current tenants and Tatsuno, and that Tatsuno has asked Goodman to help locate trustworthy tenants.Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
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