نتایج جستجو برای: hard problems
تعداد نتایج: 710339 فیلتر نتایج به سال:
We prove that certain problems naturally arising in knot theory are NP–hard or NP–complete. These the of obtaining one diagram from another a link bounded number Reidemeister moves, determining whether has an unlinking splitting k <mml:annotation enc...
OBJECTIVE Childhood conduct problems are associated with poor functioning in early adulthood. We tested a series of hypotheses to understand the mechanisms underlying this association. METHOD We used data from the Environmental Risk (E-Risk) Longitudinal Twin Study, a birth cohort of 2,232 twins born in England and Wales in 1994 and 1995, followed up to age 18 years with 93% retention. Severe...
In order to deal with over-constrained Constraint Satisfaction Problems, various extensions of the CSP framework have been considered by taking into account costs, uncertainties, preferences, priorities...Each extension uses a specific mathematical operator (+;max : : :) to aggregate constraint violations. In this paper, we consider a simple algebraic framework, related to Partial Constraint Sa...
a relevance extending into more general fields. The headings include?A Community Approach to Preventive Psychiatry, The Psychology of Pregnancy, Early Mother-Child Relationships, and Mental Health Aspects of Family Life. Building on a concept from an earlier work (Emotional Problems of Early Childhood, p. 156) he pays attention to pathogenic forces in the community, together with the traditiona...
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