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This paper presents an approach for representing queries in natural language as semantic networks. The semantic representation is intended to facilitate the translation between natural language and database queries. A domain agnostic algorithm, based on shallow features, is used to map a sentence to a sub-network of concepts within a larger ontology. This(More)
This paper introduces the problem of modeling urban transportation systems in a database where certain aspects of the data are probabilistic in nature. The transportation network is composed of multiple modes (e.g., automobile, bus, train, pedestrian) that the user can alternate between. A trip -- a path between an origin and destination subject to some(More)
Navigating large, urban transportation networks is a complicated task. A user needs to negotiate the available modes of transportation, their schedules, and how they are interconnected. In this article we present a Natural Language interface for trip planning in complex, multimodal, urban transportation networks. Our objective is to provide robust(More)
In this paper we discuss a method for understanding ambiguous language in natural language interfaces for mobile devices. We approach the problem by modeling the user and system with semantic web ontologies that are informed by a context-aware computing platform. The semantic model is then used to interpret ambiguous language based on the user’s real-world(More)
PURPOSE To assess the quantitative performance and reproducibility of a new generation linear accelerator using images and trajectory log files across institutions. METHODS A test suite was created to include tests recommended by TG142 (e.g, picket fence at cardinal static gantry angles and during VMAT) and TG179 (e.g. image quality). The test suite,(More)
PURPOSE To develop an integrated statistical process control (SPC) framework using digital performance and component data accumulated within the accelerator system that can detect dysfunction prior to unscheduled downtime. METHODS Seven digital accelerators were monitored for twelve to 18 months. The accelerators were operated in a 'run to failure mode'(More)
Construction schedules exist in many forms to serve many purposes. They are prepared by various means by different individuals either manually or aided by computer software. Work which is underway to automate the production of schedules is now being supplemented by the development of an evaluation package for general usage . Outlined in this paper are(More)
PURPOSE To develop a model to analyze medical accelerator generated parameter and performance data that will provide an early warning of performance degradation and impending component failure. METHODS A robust 6 MV VMAT quality assurance treatment delivery was used to test the constancy of accelerator performance. The generated text log files were(More)
PURPOSE To determine the effectiveness of SPC analysis for a model predictive maintenance process that uses accelerator generated parameter and performance data contained in trajectory log files. METHODS Each trajectory file is decoded and a total of 131 axes positions are recorded (collimator jaw position, gantry angle, each MLC, etc.). This raw data is(More)
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