While at Ursinus Norm set a goal to become a professor and upon graduation he accepted a teaching assistantship from the Division of Mathematical Sciences at Purdue University in West Lafayette, Indiana. During his first term he met his wife Barbara (also a TA) in an Abstract Algebra class. Barbara was a secondary school mathematics teacher until their two children were born. She now teaches pa...

The interest to build ecosystem models is well acknowledged in order to improve the understanding of the sophisticated linkages between humans and natural species embedded within variable local and global environmental contexts. It is especially true when a complex temporal evolution intervenes as in population regulations. Ecological modellers usually resort to numerical models supported by ac...

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau...

Discrete events systems (DES) have their behaviors defined by the sequences of events they can execute. For example, communication protocols and computer networks can be seen as DES. Finite state automata (FSA) are convenient for studying (i.e., analyzing, designing) DES, and timed automata (TA) are convenient for describing real-time DES. An approach for studying a real-time DES, is to transfo...

Toxin-antitoxin (TA) systems, stress-responsive genetic elements ubiquitous in microbial genomes, are unusually abundant in the major human pathogen Mycobacterium tuberculosis. Why M. tuberculosis has so many TA systems and what role they play in the unique biology of the pathogen is unknown. To address these questions, we have taken a comprehensive approach to identify and functionally charact...

The characteristics of XML documents require new ways of storing and querying such documents. Queries on both textual content and structural aspects must be supported efficiently. For this reason, we examined existing work on both document storage approaches and models for querying documents deriving requirements that are essential for the storage of XML documents. As a result of our study, we ...

BACKGROUND Eurycoma longifolia is a medicinal plant commonly called tongkat ali (TA) and "Malaysian ginseng." TA roots are a traditional "anti-aging" remedy and modern supplements are intended to improve libido, energy, sports performance and weight loss. Previous studies have shown properly-standardized TA to stimulate release of free testosterone, improve sex drive, reduce fatigue, and improv...

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau...

The term of complex data set indicates that the target da ta set t o be recognized consists of multiple categories of pattern samples. Recognition of complex da ta set is a challenging research topic in computer vision and pattern recognition. The entropy reduction approach has been widely used t o solve the problem of recognition of single category data set. In this paper we generalize this co...

Abstract Miscommunication between instructors and students is a significant obstacle to post-secondary learning. Students may skip office hours due insecurities or scheduling conflicts, which can lead missed opportunities for questions. To support self-paced learning encourage creative thinking skills, academic institutions must redefine their approach education by offering flexible educational...