980 research outputs found
Consciosusness in Cognitive Architectures. A Principled Analysis of RCS, Soar and ACT-R
This report analyses the aplicability of the principles of consciousness developed in the ASys project to three of the most relevant cognitive architectures. This is done in relation to their aplicability to build integrated control systems and studying their support for general mechanisms of real-time consciousness.\ud
To analyse these architectures the ASys Framework is employed. This is a conceptual framework based on an extension for cognitive autonomous systems of the General Systems Theory (GST).\ud
A general qualitative evaluation criteria for cognitive architectures is established based upon: a) requirements for a cognitive architecture, b) the theoretical framework based on the GST and c) core design principles for integrated cognitive conscious control systems
Preprototype vapor compression distillation subsystem
A three-person capacity preprototype vapor compression distillation subsystem for recovering potable water from wastewater aboard spacecraft was designed, assembled, and tested. The major components of the subsystem are: (1) a distillation unit which includes a compressor, centrifuge, central shaft, and outer shell; (2) a purge pump; (3) a liquids pump; (4) a post-treat cartridge; (5) a recycle/filter tank; (6) an evaporator high liquid level sensor; and (7) the product water conductivity monitor. A computer based control monitor instrumentation carries out operating mode change sequences, monitors and displays subsystem parameters, maintains intramode controls, and stores and displays fault detection information. The mechanical hardware occupies 0.467 m3, requires 171 W of electrical power, and has a dry weight of 143 kg. The subsystem recovers potable water at a rate of 1.59 kg/hr, which is equivalent to a duty cycle of approximately 30% for a crew of three. The product water has no foul taste or odor. Continued development of the subsystem is recommended for reclaiming water for human consumption as well as for flash evaporator heat rejection, urinal flushing, washing, and other on-board water requirements
Electrochemical energy storage subsystems study, volume 1
The effects on life cycle costs (LCC) of major design and performance technology parameters for multi kW LEO and GEO energy storage subsystems using NiCd and NiH2 batteries and fuel cell/electrolysis cell devices were examined. Design, performance and LCC dynamic models are developed based on mission and system/subsystem requirements and existing or derived physical and cost data relationships. The models define baseline designs and costs. The major design and performance parameters are each varied to determine their influence on LCC around the baseline values
Diagnosing Business Processes Execution using Choreography Analysis
This work presents a proposal to diagnose business processes that form
a global process using a choreography analysis. The diagnosis is based on distributed
diagnosis since the business process is formed by a process orchestrations modelled
by a set of activities. These business processes have two different types of activities,
with internal and external interaction. In this paper the knowledge of the whole
business process is divided in different processes. In means that each user has a local
point of view of the information of the organization, it also happens in distributed
system, where neither agent has global information of how the system is modelled.
This work propose a methodology to diagnose the business processes, analyzing only
the interactions between the activities of different processes. In order to perform
the fault detection for business processes, an algorithm has been defined based on
distributed diagnosis. Also some definitions about model-based diagnosis have been
redefined to be adapted to business processes diagnosis.Ministerio de Educación y Ciencia DIP2006-15476-C02-0
Frame functions in finite-dimensional Quantum Mechanics and its Hamiltonian formulation on complex projective spaces
This work concerns some issues about the interplay of standard and geometric
(Hamiltonian) approaches to finite-dimensional quantum mechanics, formulated in
the projective space. Our analysis relies upon the notion and the properties of
so-called frame functions, introduced by A.M. Gleason to prove his celebrated
theorem. In particular, the problem of associating quantum state with positive
Liouville densities is tackled from an axiomatic point of view, proving a
theorem classifying all possible correspondences. A similar result is
established for classical observables representing quantum ones. These
correspondences turn out to be encoded in a one-parameter class and, in both
cases, the classical objects representing quantum ones result to be frame
functions. The requirements of covariance and (convex) linearity play a
central r\^ole in the proof of those theorems. A new characterization of
classical observables describing quantum observables is presented, together
with a geometric description of the -algebra structure of the set of
quantum observables in terms of classical ones.Comment: 32 pages, no figure, fixed some coefficients and added some comments
and references, accepted for publication in Int. J. Geom. Methods. Mod. Phy
Spacecraft design project: High latitude communications satellite
The spacecraft design project was part of AE-4871, Advanced Spacecraft Design. The project was intended to provide experience in the design of all major components of a satellite. Each member of the class was given primary responsibility for a subsystem or design support function. Support was requested from the Naval Research Laboratory to augment the Naval Postgraduate School faculty. Analysis and design of each subsystem was done to the extent possible within the constraints of an eleven week quarter and the design facilities (hardware and software) available. The project team chose to evaluate the design of a high latitude communications satellite as representative of the design issues and tradeoffs necessary for a wide range of satellites. The High-Latitude Communications Satellite (HILACS) will provide a continuous UHF communications link between stations located north of the region covered by geosynchronous communications satellites, i.e., the area above approximately 60 N latitude. HILACS will also provide a communications link to stations below 60 N via a relay Net Control Station (NCS), which is located with access to both the HILACS and geosynchronous communications satellites. The communications payload will operate only for that portion of the orbit necessary to provide specified coverage
Preliminary study of advanced life-support technology for a Mars surface module
Subsystem definition of advanced life support technology for Mars surface modul
Earth orbital teleoperator systems evaluation
The mechanical extension of the human operator to remote and specialized environments poses a series of complex operational questions. A technical and scientific team was organized to investigate these questions through conducting specific laboratory and analytical studies. The intent of the studies was to determine the human operator requirements for remotely manned systems and to determine the particular effects that various system parameters have on human operator performance. In so doing, certain design criteria based on empirically derived data concerning the ultimate control system, the human operator, were added to the Teleoperator Development Program
Microwave power transmission system studies. Volume 2: Introduction, organization, environmental and spaceborne systems analyses
Introduction, organization, analyses, conclusions, and recommendations for each of the spaceborne subsystems are presented. Environmental effects - propagation analyses are presented with appendices covering radio wave diffraction by random ionospheric irregularities, self-focusing plasma instabilities and ohmic heating of the D-region. Analyses of dc to rf conversion subsystems and system considerations for both the amplitron and the klystron are included with appendices for the klystron covering cavity circuit calculations, output power of the solenoid-focused klystron, thermal control system, and confined flow focusing of a relativistic beam. The photovoltaic power source characteristics are discussed as they apply to interfacing with the power distribution flow paths, magnetic field interaction, dc to rf converter protection, power distribution including estimates for the power budget, weights, and costs. Analyses for the transmitting antenna consider the aperture illumination and size, with associated efficiencies and ground power distributions. Analyses of subarray types and dimensions, attitude error, flatness, phase error, subarray layout, frequency tolerance, attenuation, waveguide dimensional tolerances, mechanical including thermal considerations are included. Implications associated with transportation, assembly and packaging, attitude control and alignment are discussed. The phase front control subsystem, including both ground based pilot signal driven adaptive and ground command approaches with their associated phase errors, are analyzed
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