SPEEDY: An Eclipse-based IDE for invariant inference

SPEEDY is an Eclipse-based IDE for exploring techniques that assist users in generating correct specifications, particularly including invariant inference algorithms and tools. It integrates with several back-end tools that propose invariants and will incorporate published algorithms for inferring object and loop invariants. Though the architecture is language-neutral, current SPEEDY targets C programs. Building and using SPEEDY has confirmed earlier experience demonstrating the importance of showing and editing specifications in the IDEs that developers customarily use, automating as much of the production and checking of specifications as possible, and showing counterexample information directly in the source code editing environment. As in previous work, automation of specification checking is provided by back-end SMT solvers. However, reducing the effort demanded of software developers using formal methods also requires a GUI design that guides users in writing, reviewing, and correcting specifications and automates specification inference.Comment: In Proceedings F-IDE 2014, arXiv:1404.578

Psychological Contracts, OCB and Customer Service: An Exploratory Examination

This paper examines the relationships among the psychological contract, fairness, OCB, and customer service. We report on two exploratory studies that provide insight into psychological contract violations and subsequent perceptions of fairness, as well as OCB activity. A linkage is made between psychological contracts and behavior directed internally and those directed externally (i.e., customer service). We extend the current theory to suggest implications for effectively managing customer service employee OCB. Finally, suggestions are made for both practice and future research to be conducted in a multidisciplinary design

Variation in African American parents' use of early childhood physical discipline

Physical discipline is endorsed by a majority of adults in the U.S. including African American (AA) parents who have high rates of endorsement. Although many studies have examined physical discipline use among AA families, few have considered how early childhood physical discipline varies within the population. Individuals within a cultural group may differ in their engagement in cultural practices (Rogoff, 2003). Furthermore, AA families’ characteristics and their contexts, which are shaped by the interaction of social position, racism, and segregation (García Coll et al., 1996), likely influence how AA families physically discipline their young children. This study examined variation in early childhood physical discipline among AA families living in low-income communities and relations with demographic and contextual factors. Year 1 data from 310 AA parents living in three regionally distinct low-income communities were used from a sequential longitudinal intervention program study of the development and prevention of conduct disorder. Latent class analyses were conducted using parents’ responses on a measure, of the frequency of overall physical discipline, spanking, and hitting during prekindergarten and kindergarten. The associations between latent classes and six demographic and contextual factors were examined using the Bolck, Croon, and Hagenaars (BCH) method. The factors were: child gender (59% male); marital status (51% never married); parental education (66% high school graduates and beyond); income (mean = $16.66K, S.D. = 12.50), family stress, and perception of neighborhood safety. Measures included the Family Information Form, Life Changes, and the Neighborhood Questionnaire. After considering two to seven class solutions, five physical discipline classes or sub-groups were identified. Classes were defined by discipline frequency (‘Infrequent’, ‘Weekly’, ‘Monthly’, ‘Almost-Every-Day’ and ‘Weekly-All’) as well as by discipline type (only parents in the ‘Weekly-All’ class hit their children). Significant associations were found between class membership, and child gender, marital status, income, and perception of neighborhood safety. Girls were more likely to be physically disciplined infrequently, χ2(4, N = 310) = 11.88, p = .05. The ‘Weekly’ class had significantly fewer married parents than all classes except ‘Almost-Every-Day’, χ2(4, N = 310) = 21.56, p < .001. Parents in the ‘Almost-Every-Day’ class had a significantly lower income than parents in all other classes except “Weekly-All”, χ2(4, N = 310) = 10.88, p = .03. Finally, parents in the “Almost-Every-Day” class perceived their neighborhood as significantly less safe compared to those in all other classes except the ‘Weekly-All’ class, χ2(4, N = 310) = 14.13 p = .01. These findings suggest that AA families vary in physical discipline during early childhood; this variation may result in sub-groups with different demographic characteristics. Associations between frequent discipline classes and perceptions of neighborhood safety implies that some AA parents may use physical discipline to protect their children from being harmed if they believe their communities are unsafe. Future research should qualitatively examine how AA parents respond to unsafe neighborhoods in their parenting behaviors, including physical discipline

Effects of Lift Velocity on Muscle Activation During Leg Extension

It is not known if manipulating velocity within a prescribed resistance training mode will improve muscle activation. Muscle activations of the Rectus Femoris (RF), Vastus Lateralis (VL), Vastus Medialis (VM) and Bicep Femoris (BF) were examined during a leg extension exercise at 3 different velocities on 15 subjects (10men, 5 female, Age = 21.5 ± 1.8 yrs, Height = 171.2 ± 12.5 cm, Mass = 75.5 ± 16.3 kg). Trials of 1 set of 10 repetitions at 60% of 1RM, were performed at 15, 30 and 60º/s. Bipolar surface electrodes were placed over the BF, RF, VL, and VM. Micro-switches were utilized to identify the concentric (CON) and eccentric (ECC) phases of the lift. Data were sampled at 1024 Hz, filtered, rectified and the mean, integrated EMG calculated. One 2 x 4 x 3 (action x muscle x velocity) ANOVA with bonferonni adjustment was run and significance was followed by Tukey HSD post hoc analysis. Results indicated significantly greater activation of the VL, RF and VM for ECC extension at 60º/s compared to 15º/s. While 60º/s was also greater than 30º/s for the VL and VM during ECC. While comparing muscle action, CON VL, VM and RF were greater than ECC at 30º/sec, meanwhile VM CON was also greater at 15º/sec. No differences in muscle activation at any velocity or muscle action for BF were identified. We conclude that muscle recruitment while training with a 60% 1RM load is maximized at a velocity of 60º/s during ECC activity and 15 or 30º/sec during CON

Observability and observer design for switched linear systems

Hybrid vehicles, HVAC systems in new/old buildings, power networks, and the like require safe, robust control that includes switching the mode of operation to meet environmental and performance objectives. Such switched systems consist of a set of continuous-time dynamical behaviors whose sequence of operational modes is driven by an underlying decision process. This thesis investigates feasibility conditions and a methodology for state and mode reconstruction given input-output measurements (not including mode sequence). An application herein considers insulation failures in permanent magnet synchronous machines (PMSMs) used in heavy hybrid vehicles. Leveraging the feasibility literature for switched linear time-invariant systems, this thesis introduces two additional feasibility results: 1) detecting switches from safe modes into failure modes and 2) state and mode estimation for switched linear time-varying systems. This thesis also addresses the robust observability problem of computing the smallest structured perturbations to system matrices that causes observer infeasibility (with respect to the Frobenius norm). This robustness framework is sufficiently general to solve related robustness problems including controllability, stabilizability, and detectability. Having established feasibility, real-time observer reconstruction of the state and mode sequence becomes possible. We propose the embedded moving horizon observer (EMHO), which re-poses the reconstruction as an optimization using an embedded state model which relaxes the range of the mode sequence estimates into a continuous space. Optimal state and mode estimates minimize an L2-norm between the measured output and estimated output of the associated embedded state model. Necessary conditions for observer convergence are developed. The EMHO is adapted to solve the surface PMSM fault detection problem

Correction to “Recent western South Atlantic bottom water warming”

Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 33 (2006): L21604, doi:10.1029/2006GL028294

South Carolina and the Hogg Edition

Reports on work done at the University of South Carolina for the Stirling-South Carolina Edition of the Scottish poet and novelist James Hogg, including bibliographical research for the South Carolina Working Papers in Scottish Bibliography. Originally presented by Jep C. Johnson at the James Hogg Society Conference, Dumfries, Scotland, July 1993

Elevated Depressive Symptoms In A Community Sample Of African-Americans And Whites

This study examined demographic and psychosocial correlates of elevated depressive symptoms among African-Americans and Whites from comparable socioeconomic and neighborhood backgrounds. 851 African-Americans and 597 Whites from adjacent census tracts were interviewed using previously validated indicators of depressive symptoms, social support, religious practices and various demographic characteristics. More Whites than African-Americans reported elevated depressive symptoms and the groups also differed on several demographic variables and psychosocial variables. Employment, marital status and age were salient demographic covariates for African Americans, while income was for Whites. For both groups, social support and church attendance were inversely associated with depressive symptoms. Prayer was positively associated with depressive symptoms. Future research should explore within racial/ethnic group variations in depressive symptoms. Insights also are needed into possible changes over time in the relationship between religious variables and depressive symptoms, and how social support limits depressive symptoms in diverse populations

Schistosoma haematobium infection and Buruli ulcer

No abstract available

Recovery of critically endangered Nassau grouper (Epinephelus striatus) in the Cayman Islands following targeted conservation actions.

Many large-bodied marine fishes that form spawning aggregations, such as the Nassau grouper (Epinephelus striatus), have suffered regional overfishing due to exploitation during spawning. In response, marine resource managers in many locations have established marine protected areas or seasonal closures to recover these overfished stocks. The challenge in assessing management effectiveness lies largely in the development of accurate estimates to track stock size through time. For the past 15 y, the Cayman Islands government has taken a series of management actions aimed at recovering collapsed stocks of Nassau grouper. Importantly, the government also partnered with academic and nonprofit organizations to establish a research and monitoring program (Grouper Moon) aimed at documenting the impacts of conservation action. Here, we develop an integrated population model of 2 Cayman Nassau grouper stocks based on both diver-collected mark-resight observations and video censuses. Using both data types across multiple years, we fit parameters for a state-space model for population growth. We show that over the last 15 y the Nassau grouper population on Little Cayman has more than tripled in response to conservation efforts. Census data from Cayman Brac, while more sparse, show a similar pattern. These findings demonstrate that spatial and seasonal closures aimed at rebuilding aggregation-based fisheries can foster conservation success