36 articles for “hard problems”

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Research ArticleOpen accessIn the abstractModel Development for Health Promotion in the Elderly Participating in CommunitiesSupat Jampawai, Somporn Pothinam, Manop Kanato et al.Problem statement: The problem of the research derives from a lack of research study to develop the suitable model for health promotion in the elderly and examine factors concerning the health promotion in the elderly. This research aimed to study and develop suitable health promotion model for elderly participating in communities and examine factors related to the health promotion of … …American Journal of Applied Sciences, Vol. 8, Issue 9 · 30 Jul 2011 · 7,463 accessesView PDF Cite

Research ArticleOpen accessIn the abstractMeta Heuristic Algorithms for Vehicle Routing Problem with Stochastic DemandsGeetha Shanmugam, Poonthalir Ganesan, Dr. P.T. VanathiProblem statement: The shipment of goods from manufacturer to the consumer is a focal point of distribution logistics. In reality, the demand of consumers is not known a priori. This kind of distribution is dealt by Stochastic Vehicle Routing Problem (SVRP) which is a NP-hard problem. In this proposed work, VRP with stochastic demand is considered. A probability distribution is … …Journal of Computer Science, Vol. 7, Issue 4 · 4 Apr 2011 · 8,021 accessesView PDF Cite

Research ArticleOpen accessIn the abstractFormulation and Evaluation of a Novel Needle-Free Hepatitis B Surface Antigen Delivery SystemC. D. Licy, K. Premalatha, Annie Shirwaikar, Arun ShirwaikarProblem statement: Hepatitis B is a major public health problem, killing 1-2 million people annually, despite the introduction of an effective vaccine in 1982. Approximately 400 million persons worldwide have chronic hepatitis B. This is due to problems associated with vaccine delivery, stability and cost. Hence the present challenge in Vaccinology is to develop safer, cheaper and easy-to-deliver forms of … …Current Research in Medicine, Vol. 1, Issue 2 · 30 Oct 2010 · 6,819 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordIndividualization Training of Players on Positions at the Level of Handball Junior TeamsPitigoi GabrielProblem statement: Starting from the observation that for the handball players, who finished the junior state in hard to integrate in senior teams due to a low level of preparation. I hypothesized that at this level we can use all organizational forms of individual training (frontal relation, group level, individual).Using individual records, performance behavior characteristics of the players to positions, … …Journal of Social Sciences, Vol. 7, Issue 3 · 16 Jul 2011 · 7,230 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordSolving One-Dimensional Cutting Stock Problem with Discrete Demands and Capacitated Planning ObjectiveSirirat Wongprakornkul, Peerayuth CharnsethikulProblem statement: One-dimensional cutting stock problem with discrete demands and capacitated planning objective is an NP hard problem. Approach: The mathematical model with column-generation technique by a branch-and-bound procedure and the heuristic based on the first fit decreasing method are proposed. Then, both approaches were compared and some characteristics were investigated such as upper-bound value, percentage above lower-bound value, computation … …Journal of Mathematics and Statistics, Vol. 6, Issue 2 · 30 Jun 2010 · 7,947 accessesView PDF Cite

Research ArticleOpen accessAll words, across the recordBenders' Decomposition Based Heuristics for Large-Scale Dynamic Quadratic Assignment ProblemsSirirat Muenvanichakul, Peerayuth CharnsethikulProblem statement: Dynamic Quadratic Assignment Problem (DQAP) is NP hard problem. Benders decomposition based heuristics method is applied to the equivalent mixed-integer linear programming problem of the original DQAP. Approach: Approximate Benders Decomposition (ABD) generates the ensemble of a subset of feasible layout for Approximate Dynamic Programming (ADP) to determine the sub-optimal optimal solution. A Trust-Region Constraint (TRC) for the … …Journal of Computer Science, Vol. 5, Issue 1 · 31 Jan 2009 · 7,681 accessesView PDF Cite