Juan E. Vargas

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This paper presents Synergetic Control Theory (SCT) and discusses how it can be used for solving systems of nonlinear equations. SCT is a new methodology for solving systems of nonlinear equations. The main advantage of SCT is that it maps the original system of equations to a dynamical system such that (1) any trajectory in the state space of the system(More)
This paper describes a generic schematic knowledge representation, acquisition, and manipulation system (SKRAM) applied to diagnostic problem solving in analog circuits. SKRAM is a general purpose declarative, schema-oriented system composed of five layers: (1) an object-oriented implementation layer, (2) a logical layer defining object features, i.e.,(More)
BACKGROUND Intrahepatic cholestasis of pregnancy (ICP) has important fetal implications. There is increased risk for poor fetal outcomes, including preterm delivery, meconium staining of amniotic fluid, respiratory distress, fetal distress and demise. METHODS One hundred and one women diagnosed with ICP between January 2005 and March 2009 at San Francisco(More)
This paper advocates the use of similarity-based reasoning to improve the efficacy of AI applications dealing with diagnosis of electronic circuits. A paradigm for similarity-based matching is presented, application of this paradigm to diagnosis of electronic circuits is discussed, and a system architecture that supports this concept is described.
INTRODUCTION In their simplest form, sensors are transducers that convert physical phenomena into electrical signals. By combining recent innovations in wireless technology, distributed computing, and transducer design, grids of sensors equipped with wireless communication can monitor large geographical areas. However, just getting the data is not enough.(More)
In the Americas, women with Indigenous American ancestry are at increased risk of intrahepatic cholestasis of pregnancy (ICP), relative to women of other ethnicities. We hypothesized that ancestry-related genetic factors contribute to this increased risk. We collected clinical and laboratory data, and performed biochemical assays on samples from U.S.(More)