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PURPOSE To find any feature of prognostic significance among the clinical and histological characteristics of paediatric patients diagnosed with medulloblastoma (MB). MATERIALS AND METHODS Clinical charts and paraffin blocks of 79 paediatric patients from nine Spanish institutions diagnosed with MB between 1980 and 2001 were reviewed retrospectively.(More)
This paper describes a scalable method for parallelizing sampling-based motion planning algorithms. It subdivides configuration space (C-space) into (possibly overlapping) regions and independently, in parallel, uses standard (sequential) sampling-based planners to construct roadmaps in each region. Next, in parallel, regional roadmaps in adjacent regions(More)
We present an approach to the pursuit-evasion problem which is applicable to complex, multi-level environments. Studying each aspect of this problem in 3D structured environments is a distinct extension over many previous approaches. We also utilize our roadmap-based approach to multi-agent behavior when tracking agents of interest. Results are presented in(More)
In this work, we describe an approach for modeling and simulating group behaviors for pursuit-evasion that uses a graph-based representation of the environment and integrates multi-agent simulation with roadmap-based path planning. Our approach can be applied to more realistic scenarios than are typically studied in most previous work, including agents(More)
Multi-Agent Systems involve the cooperation and coordination of groups of agents in an environment while they perform tasks. Previous work has provided simulated heterogeneous agents that engage in specific behavior driven actions with a priori assumptions with respect to agent knowledge of the environment. These experiments however did not have a(More)
Motion planning is the problem of computing valid paths through an environment. However, because computing exact solutions is intractable, sampling-based algorithms, such as Probabilistic RoadMaps (PRMs), have gained popularity. PRMs compute an approximate mapping of the planning space by sacrificing completeness in favor of efficiency. However, these(More)
Problems that require a traversal on a collection of data can be solved following a decrease-and-conquer algorithm strategy. Reductor is a behavioral pattern that describes an object-oriented design relying on higher-order facilities to solve this sort of problem. Intent Identify, encapsulate and organize the variant and invariant parts (both behavior and(More)
A retrospective clinical description of 7 newborn infants with adrenal haemorrhage. All patients were born at term by vaginal delivery. Their birth weights ranged between 2,550 and 3,950, and only one was small for gestational age. Two patients had Apgar scores less than 6 at one minute and both were born by forceps delivery. The first symptom of adrenal(More)
This study correlated the neonatal mortality rate with sex, birthweight, age, and cause of death at the San Juan de Dios Hospital from January 1-December 31, 1983. During this period, 7370 babies were born alive and 113 of them died. The neonatal mortality rate was 15.3/1000 livebirths; 14.2 in the early neonatal period and 1.1. in the late neonatal(More)
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