Sarah S. Lam

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In this paper, a novel discrete particle swarm optimization (PSO) algorithm is proposed to solve the team orienteering problem (TOP). Discrete evaluation is achieved by redefining all operators and operands used in PSO. To obtain better results, a strengthened PSO, which improves both exploration and exploitation during the search process, is employed. Our(More)
This research proposes a new reliable network design methodology that is based on a pattern mining guided genetic algorithm (GA). The proposed method can be applied for a variety of applications including telecommunication, ad hoc, and power systems. In these networks, failures in certain parts of a network make it necessary for other parts to tolerate a(More)
The initial study of this research applied the particle swarm optimization (PSO) heuristic to the orienteering problem (OP). PSO is a fairly new evolutionary heuristic-type algorithm created by Drs. Eberhart and Kennedy in 1995. Similar to ant colony optimization, motivation for PSO is nature-based on fish schooling and bees swarming. The OP is a variation(More)
Cardiac catheterization is one of the critical procedures in patient care. It is pertinent for all process related issues in this department to be handled with due priority. This research is a cross-functional effort with a leading hospital that was in its planning stage to implement an overall process improvement at its cardiac catheterization lab(More)
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This research studies the risk prediction of hospital readmissions using metaheuristic and data mining approaches. This is a critical issue in the U.S. healthcare system because a large percentage of preventable hospital readmissions derive from a low quality of care during patients’ stays in the hospital as well as poor arrangement of the discharge(More)
Many useful patterns can be derived from analyzing microblogging behavior at different scales (individual and social group). In this paper, we derive patterns relating to spatio-temporal traffic flow, visit regularity, content and social ties as they relate to an individual's activities in an urban environment (e.g., New York City). We also demonstrate,(More)