What is usability in the context of the digital library and how can it be measured?

This paper reviews how usability has been defined in the context of the digital library, what methods have been applied and their applicability, and proposes an evaluation model and a suite of instruments for evaluating usability for academic digital libraries. The model examines effectiveness, efficiency, satisfaction, and learnability. It is found that there exists an interlocking relationship among effectiveness, efficiency, and satisfaction. It also examines how learnability interacts with these three attributes

Irregular Hodge filtration on twisted de Rham cohomology

We give a definition and study the basic properties of the irregular Hodge filtration on the exponentially twisted de Rham cohomology of a smooth quasi-projective complex variety.Comment: 34 pages. Paper shortened, in particular, sections 3 and 6 in previous version have been removed; a mistake in the proof in old section 5 correcte

Child Food Insecurity: The Economic Impact on our Nation

In this report we present the results of Children's HealthWatch's recent research on the associations of food insecurity and hunger, as measured by the US Food Security Scale, with child health, growth and development.In addition, we place these research results within the context of other research on food security and hunger over the past ten years. Several important themes emerge from the research we describe. These include:Child Hunger is a Health ProblemChild Hunger is an Educational Problem Child Hunger is a Workforce and Job Readiness Proble

Pre-logarithmic and logarithmic fields in a sandpile model

We consider the unoriented two-dimensional Abelian sandpile model on the half-plane with open and closed boundary conditions, and relate it to the boundary logarithmic conformal field theory with central charge c=-2. Building on previous results, we first perform a complementary lattice analysis of the operator effecting the change of boundary condition between open and closed, which confirms that this operator is a weight -1/8 boundary primary field, whose fusion agrees with lattice calculations. We then consider the operators corresponding to the unit height variable and to a mass insertion at an isolated site of the upper half plane and compute their one-point functions in presence of a boundary containing the two kinds of boundary conditions. We show that the scaling limit of the mass insertion operator is a weight zero logarithmic field.Comment: 18 pages, 9 figures. v2: minor corrections + added appendi