The Knapsack Problem with Neighbour Constraints

We study a constrained version of the knapsack problem in which dependencies between items are given by the adjacencies of a graph. In the 1-neighbour knapsack problem, an item can be selected only if at least one of its neighbours is also selected. In the all-neighbours knapsack problem, an item can be selected only if all its neighbours are also selected. We give approximation algorithms and hardness results when the nodes have both uniform and arbitrary weight and profit functions, and when the dependency graph is directed and undirected.Comment: Full version of IWOCA 2011 pape

The use of mentor texts to teach writing in kindergarten, first and second grades

The purpose of this study was to research and analyze high quality fiction and nonfiction texts to be used as mentor texts to teach writing in kindergarten, first and second grades. The researcher created a checklist and a table to analyze 81 different texts and then selected 29 to be used as mentor texts to assist in teaching opinion/persuasive, narrative and informational writing. Annotated bibliographies for the 29 texts were written and include how the texts can be used to teach writing in a classroom and/or library setting

Review of The Leadership of C. S. Lewis: Ten Traits to Encourage Change and Growth

Review of Crystal Hurd, The Leadership of C. S. Lewis: Ten Traits to Encourage Change and Growth (Hamden, CT: Winged Lion Press, 2022). 232 pages. $18.99. ISBN 9781935688334

Epidemiology of atrial fibrillation in the general population

Atrial fibrillation is a common disease of the heart, characterized by an irregular and, if not treated, mostly fast heart rhythm. The origin of the disease is the atrial part of the heart. It is a rare disease before the age of 55, but the prevalence is sharply increasing with age. In many cases patients do not even notice that they have a rhythm disorder. But if they have complaints, they mention dyspnoea, chest pain, palpitations, dizziness, and sometimes syncope. For many years, atrial fibrillation has been considered as an innocent bystander of old age, but it is nowadays generally accepted that atrial fibrillation is associated with impaired quality of life and increased morbidity and mortality. Treatment regimens evolved as a consequence, unfortunately sometimes introducing new potential harms to the patients with this disease. Atrial fibrillation is involved in pathological processes through the whole body and has through that inspired numerous investigators in internal medicine, cardiology, neurology, pathology, pharmacology, physiology and epidemiology. The disease concept has evolved as science evolved and often has been in the centre of intense dispute