Jeffrey Stewart

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Adulthood normally spans more than 60 years, starting from about age 20, and the cognitive changes during those years are vast. Accumulated evidence indicates that cognitive development in adulthood is rich, complex, and dynamic, perhaps even more so than in infancy and childhood, with many factors acting together in various contexts to produce systematic,(More)
We address the problem of modeling long-term energy policy and investment decisions while retaining the important ability to capture fine-grained variations in intermittent energy and demand, as well as storage. In addition, we wish to capture sources of uncertainty such as future energy policies, climate, and technological advances, in addition to the(More)
This paper provides an overview of the one-stage R&D portfolio optimization problem. It provides a novel problem model that can be solved with stochastic combinatorial optimization methods. Current solution methods are reviewed and a new method that scales to large problems, Stochastic Gradient Portfolio Optimization (SGPO), is proposed. Although SGPO is a(More)
• Google Android and Apple iOS ecosystems differ fundamentally, largely because of their parent compa-nies' different business models. However, the platforms' tools and protections appear to be converging: Android is adopting run-time permissions requests, which iOS has used for years; both are incorporating stronger encryption. • On Android, some apps(More)
Modern mobile devices place a wide variety of sensors and services within the personal space of their users. As a result, these devices are capable of transparently monitoring many sensitive aspects of these users' lives (e.g., location, health, or correspondences). Users typically trade access to this data for convenient applications and features, in many(More)
BACKGROUND The presence of dysphoric symptoms associated with neuroleptic medication is commonly reported. METHOD Neuroleptic treatment of a segmental dystonia resulted in a disabling depressive illness, which when treated with antidepressants led to the return of the involuntary movements. RESULTS The use of several different antidepressants and(More)
Disclaimer This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any(More)