101 research outputs found
Exploratory factor analysis of African self-consciousness scale scores:
No full textThe current study is an exploratory factor analysis of the African Self-Consciousness Scale (ASCS), a 42-item self-report measure of Afrocentricity, or the degree to which African American individuals espouse African-centered cultural, social, and political identities. Previous research has produced inconsistent results regarding the latent dimensionality and psychometric properties of the ASCS. With a sample of 348 African Americans, the current study conducts a methodologically rigorous exploratory factor analysis of ASCS scores. The study also examines convergent validity of the measure as compared to a measure of African Americans’ endorsements of negative stereotypes of Blacks. Factor analysis produced strong support for a two-factor model of the ASCS. Further support for the validity of the ASCS was found when the factor assessing non-Afrocentric or anti-Afrocentric beliefs correlated significantly with the measure of stereotypes. This evidence strongly suggests that the ASCS is not a unidimensional measure. Implications of these findings for the use of the ASCS and recommendations for further investigation are discussed.M.S.Includes bibliographical references (p. 33-36)by Ranjit Bhagwa
The relationship of skin tone to physical and mental health outcomes in South Asian Americans
No full textSince 1990, the South Asian population in America has exhibited massive growth, as large numbers of immigrants from India, Pakistan, and other South Asian countries have arrived in the United States. Yet limited empirical psychological research has been conducted assessing race-related stressors in this population. Skin tone (skin color) has been linked frequently with physical and mental health outcomes in other American ethnic minority populations, such that dark skin tone typically correlates with poor outcomes. The present study demonstrated, in a relatively large sample of South Asian Americans, that darkness of skin tone negatively predicted self-esteem and self-rated physical health. Contrary to expectations, dark skin tone positively predicted general mental health. The study also investigates the mediation role of perceived discrimination and body image disturbance in these relationships, as well as the moderating roles of gender, socioeconomic status, and ethnic identification. The relationship of dark skin tone to low self-esteem, but not low self-rated physical health or high general mental health, was mediated via increased body image disturbance. Ethnic identification moderated the positive association between dark skin tone and general mental health, such that this association was strong at low levels of ethnic identification and reversed for individuals of high ethnic identification. Neither gender nor ethnic identification moderated the negative associations between dark skin tone and low self-rated physical health or low self-esteem. Implications and recommendations are discussed.Ph. D.Includes bibliographical referencesby Ranjit Bhagwa
Finding typing compiler bugs
No full textWe propose a testing framework for validating static typing procedures in compilers. Our core component is a program generator suitably crafted for producing programs that are likely to trigger typing compiler bugs. One of our main contributions is that our program generator gives rise to transformation-based compiler testing for finding typing bugs. We present two novel approaches (type erasure mutation and type overwriting mutation) that apply targeted transformations to an input program to reveal type inference and soundness compiler bugs respectively. Both approaches are guided by an intra-procedural type inference analysis used to capture type information flow. We implement our techniques as a tool, which we call Hephaestus. The extensibility of Hephaestus enables us to test the compilers of three popular JVM languages: Java, Kotlin, and Groovy. Within nine months of testing, we have found 156 bugs (137 confirmed and 85 fixed) with diverse manifestations and root causes in all the examined compilers. Most of the discovered bugs lie in the heart of many critical components related to static typing, such as type inference.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Software Engineerin
WARio: efficient code generation for intermittent computing
No full textIntermittently operating embedded computing platforms powered by energy harvesting require software frameworks to protect from errors caused by Write After Read (WAR) dependencies. A powerful method of code protection for systems with non-volatile main memory utilizes compiler analysis to insert a checkpoint inside each WAR violation in the code. However, such software frameworks are oblivious to the code structure - -and therefore, inefficient - -when many consecutive WAR violations exist. Our insight is that by transforming the input code, i.e., moving individual write operations from unique WARs close to each other, we can significantly reduce the number of checkpoints. This idea is the foundation for WARio: a set of compiler transformations for efficient code generation for intermittent computing. WARio, on average, reduces checkpoint overhead by 58%, and up to 88%, compared to the state of the art across various benchmarks.Embedded System
Scientometric portrait of Nobel laureate Leland H. Hartwell
No full textLeland H. Hartwell was honoured with the Nobel Prize in Physiology or Medicine (2001) at his 62 years age and at 41 years of research publishing career. The first contribution of the author was in 1961 at the age of 22. The number of his contributions in a year peaked in 1997 when it touched 8. He had 108 publications during 1961 – 2001 in domains: Molecular Biology of Cell Cycle Regulation (43), Genetics of Cell Division (48), Genomic Re-arrangement and DNA Repair (9), Molecular Genetics of Yeast Cell Fission (5), and Drug Target Interaction (3) which were analysed for authorship pattern with his 101 collaborators. Most active researchers having number of publications with Leland H. Hartwell were : Weinert, T. A. (10), Garvik, B. M. (8), McLaughlin, C. S. (8), Jenness, D. D. (5). His productivity coefficient was 0.76 which clearly indicates that his productivity increased after 50 percentile age. Highest collaboration coefficient (1) for Leland H. Hartwell was found during 1963-1965, 1968-1969, 1977, 1981-1983, 1985-1990, 1996 and 1998-2001. Journals have been the most preferred channel of communication where, as many as 96 papers out of 108 have been published. The core journals publishing his papers were: Cell (14), Genetics (12), Mol. Cell Biol. (8), J. Bactariol. (7), J. Cell Biol. ( 7), Science (7) J. Mol. Biol.(6), Exp. Cell Res. (5), and Proc. Nat. Acad. Sci.(5). Publication density is 2.63 and Publication concentration is 14.63. Most prolific keywords in titles of publications were: Saccharomyces cerevisiae , Yeast , Cell division cycle , RAD9, DNA Damage , Genes , Cell cycle, Genetic control , Check point (s) , Cell division , Mutant of Yeast
Taxonomic reasoning: The case of giant wrinkled frog
No full textA recent issue of Current Science carried a correspondence entitled ‘Taxonomic vandalism: The case of the giant wrinkled frog’ by Ranjit Daniels1. The author is critical of a communication authored by us
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