Página 1 dos resultados de 1918 itens digitais encontrados em 0.018 segundos

New Improvements in Automatic Structure Elucidation Using the LSD (Logic for Structure Determination) and the SISTEMAT Expert Systems

PLAINCHONT, Bertrand; NUZILLARD, Jean-Marc; RODRIGUES, Gilberto V.; FERREIRA, Marcelo J. P.; SCOTTI, Marcus T.; EMERENCIANO, Vicente P.
Fonte: NATURAL PRODUCTS INC Publicador: NATURAL PRODUCTS INC
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.17%
This article describes the integration of the LSD (Logic for Structure Determination) and SISTEMAT expert systems that were both designed for the computer-assisted structure elucidation of small organic molecules. A first step has been achieved towards the linking of the SISTEMAT database with the LSD structure generator. The skeletal descriptions found by the SISTEMAT programs are now easily transferred to LSD as substructural constraints. Examples of the synergy between these expert systems are given for recently reported natural products.; CNRS; Centre National de la Recherche Scientifique (CNRS)

Previsão em tempo atual de cheias com uso de sistema especialista difuso; Real-time flood forecasting using fuzzy expert systems

Pedrollo, Olavo Correa
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
66.21%
Sistemas de previsão de cheias podem ser adequadamente utilizados quando o alcance é suficiente, em comparação com o tempo necessário para ações preventivas ou corretivas. Além disso, são fundamentalmente importantes a confiabilidade e a precisão das previsões. Previsões de níveis de inundação são sempre aproximações, e intervalos de confiança não são sempre aplicáveis, especialmente com graus de incerteza altos, o que produz intervalos de confiança muito grandes. Estes intervalos são problemáticos, em presença de níveis fluviais muito altos ou muito baixos. Neste estudo, previsões de níveis de cheia são efetuadas, tanto na forma numérica tradicional quanto na forma de categorias, para as quais utiliza-se um sistema especialista baseado em regras e inferências difusas. Metodologias e procedimentos computacionais para aprendizado, simulação e consulta são idealizados, e então desenvolvidos sob forma de um aplicativo (SELF – Sistema Especialista com uso de Lógica “Fuzzy”), com objetivo de pesquisa e operação. As comparações, com base nos aspectos de utilização para a previsão, de sistemas especialistas difusos e modelos empíricos lineares, revelam forte analogia, apesar das diferenças teóricas fundamentais existentes. As metodologias são aplicadas para previsão na bacia do rio Camaquã (15543 km2)...

Crime scene investigation with Bayesian probabilistic expert systems

Andrade, Marina; Ferreira, Manuel Alberto M.
Fonte: Scientific and Academic Publishing Publicador: Scientific and Academic Publishing
Tipo: Artigo de Revista Científica
Publicado em //2012 ENG
Relevância na Pesquisa
66.09%
Criminal identification problems are examples of situations in which forensic approach the DNA profiles study is a common procedure. In order to deal with these problems it is needed an introduction to present and explain the various concepts involved, since distinct areas must be considered. Some problems are presented and the use of the object-oriented Bayesian networks, example of probabilistic expert systems, is shown.

Knowledge Acquisition for Probabilistic Expert Systems

Lehmann, Harold P.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 09/11/1988 EN
Relevância na Pesquisa
66.29%
Recent interest in probability-based expert systems has focused on the potential these systems have for being coherent with the beliefs of the modeled expert or of the user and consistent given any set of evidence. We have used the probabilistic formalism in creating the REFEREE system, a belief-network-based expert system designed to aid readers in determining the credibility of a randomized clinical trial. In this paper, we explore the effect the formalism had on the process of knowledge acquisition based on this experience. Although the system is still in development, we can report several of those effects. Specifically, the need to make operational definitions of concepts deemed important to the expert forced us to organize a domain that was formulated initially for a rule-based system. Categorizing probability distributions as being logical, probabilitic, or prototypical helped us to decrease the number of probability assessments. On the other hand, the lack of an intermediate prototype may have prolonged development, and computational limitations forced occasional compromises. The reality of building expert systems in a probabilistic paradigm may not be as hard as some critics have predicted.

PROJECT MANAGEMENT MATURITY: AN ANALYSIS WITH FUZZY EXPERT SYSTEMS

Souza, Helder Jose Celani de; Salomon, Valerio Antonio Pamplona; Da Silva, Carlos Eduardo Sanches; Aguiar, Dimas Campos
Fonte: Brazilian Association for Industrial Engineering and Operations Management (ABEPRO) Publicador: Brazilian Association for Industrial Engineering and Operations Management (ABEPRO)
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Peer-reviewed Article; Survey Formato: application/pdf
Publicado em 14/05/2013 ENG
Relevância na Pesquisa
66.14%
The assessment of Project Management is a growing business practice. It can be verified with the development of several Project Management Maturity (PMM) models. This paper reports results of a survey on the PMM of Brazilian companies. That survey was based on a well known PMM model. A Fuzzy Expert System was applied to deal with model’s subjectivity and to check the consistency of survey’s responses. Methodological approaches of previous PMM researches only included general statistical analysis. This way, the present work innovates when presents the usage of intelligent techniques, as Fuzzy Sets and Expert Systems, in the PMM analysis.

An expert system for the management of hazardous materials at a Naval Supply Center

England, David C.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Tese de Doutorado Formato: vi, 94 p.
EN_US
Relevância na Pesquisa
56.28%
Approved for public release, distribution is unlimited; This thesis analyzes, designs and implements an expert system for the management of hazardous material at a Naval Supply Center (NSC). This system is part of a series of expert systems built by the Naval Postgraduate School to assist the Naval Supply Systems Command in automating its inventory management systems at NSCs. Selecting the proper storage conditions and location for newly received hazardous material requires the NSC's expert in such matters, the safety and health manager, to research the primary data base, the Hazardous Material Information System (HMIS), and any other relevant information sources, and extract the pertinent information. He determines the best storage conditions for the material and passes this information to the warehouse worker. The Hazardous Material Expert System (HAZMAT ES) will facilitate making the storage decision and will allow a warehouse worker to safely store hazardous material without the assistance of the safety and health manager.; Lieutenant Commander, United States Navy

Implementation of a Distributed Expert System for submarine shipboard maintenance using VP-Expert

Acton, David Wilber
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Tese de Doutorado Formato: vi, 64 p.
EN_US
Relevância na Pesquisa
56.28%
Approved for public release, distribution is unlimited; Expert Systems (ES) are characterized by containing the knowledge of a single human expert. Most ES today operate in a 'standalone' basis, providing expertise in a specific domain. However, managers making strategic decisions on complex topics require the coordination assessment and evaluation of knowledge from multiple human experts. Standalone knowledge bases should be loosely or tightly coupled together to form a network of coordinated Distributed Expert Systems (DES). To facilitate this, a 'meta-ES' could be designed to access and control these distributed knowledge bases, thus providing users with a single entry point into a vast knowledge network. In the U.S. Navy submarine is constructed of compact, high energy systems, safety is paramount to prevent both personal injury and material damage during maintenance evolutions. The Ship's Duty Officer (SDO) is responsible for the safe and effective execution of all maintenance aboard ship. Thus, he needs to be knowledgeable of how maintenance on one system will affect the operation of other systems. Since the SDO requires many sources of expertise, automating a submarine maintenance process is an appropriate DES application.; Lieutenant United States Navy

Expert systems and Command

Minnema, James E.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Tese de Doutorado Formato: iv
EN_US
Relevância na Pesquisa
56.26%
This thesis examines the organizational causes of the Department of Defense's (DoD) inability to acquire working defense systems. One major cause of this is identified as a lack of a sufficient number of trained and experienced acquisition personnel. An examination of the definitions of Decision Support and Expert Systems is made to determine their suitability for application to this problem. The information system framework of Gorry and Scott Morton is used to structure the acquisition problem. The DoD acquisition problem is found to be a good candidate for the application of expert systems. An expert system architecture is developed to provide acquisition personnel both technical and management support. Use of a central mainframe, connected to the Defense Data Network will provide nationwide access, with centralized control of the knowledge base. The architecture allows for the incorporation of existing conventional software under expert software control. In order to reduce development cost and time, the use of existing DoD manuals, as the knowledge base, is proposed. A prototype module, utilizing the M.1 expert shell and DoD Manual 4245.7-M and NAVSO P-6071 is developed to prove the feasibility of this approach; http://archive.org/details/expertsystemscom00minn; NA; U.S. Marine Corps (U.S.M.C.) author.

Towards an automated approach to use expert systems in the performance testing of distributed systems

Portillo-Domínguez, Andrés Omar; Wang, Miao; Murphy, John; Magoni, Damien; Mitchell, Nick; Sweeney, Peter F; Altman, Erik
Fonte: Association for Computing Machinery Publicador: Association for Computing Machinery
Tipo: info:eu-repo/semantics/conferenceObject; all_ul_research; ul_published_reviewed
ENG
Relevância na Pesquisa
66.13%
peer-reviewed; Performance testing in distributed environments is challenging. Specifically, the identification of performance issues and their root causes are time-consuming and complex tasks which heavily rely on expertise. To simplify these tasks, many researchers have been developing tools with built-in expertise. However limitations exist in these tools, such as managing huge volumes of distributed data, that prevent their e cient usage for performance testing of highly dis- tributed environments. To address these limitations, this paper presents an adaptive framework to automate the us- age of expert systems in performance testing. Our validation assessed the accuracy of the framework and the time savings that it brings to testers. The results proved the bene ts of the framework by achieving a significant decrease in the time invested in performance analysis and testing.

The use of expert systems on the differential diagnosis of urinary incontinence; Uso de sistemas especialistas para o diagnóstico diferencial de incontinência urinária; Uso de los sistemas especialistas en el diagnóstico diferencial de la incontinencia urinaria

LOPES, Maria Helena Baena de Moraes; MARIN, Heimar de Fátima; ORTEGA, Neli Regina Siqueira; MASSAD, Eduardo
Fonte: Universidade de São Paulo, Escola de Enfermagem Publicador: Universidade de São Paulo, Escola de Enfermagem
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.28%
The differential diagnosis of urinary incontinence classes is sometimes difficult to establish. As a rule, only the results of urodynamic testing allow an accurate diagnosis. However, this exam is not always feasible, because it requires special equipment, and also trained personnel to lead and interpret the exam. Some expert systems have been developed to assist health professionals in this field. Therefore, the aims of this paper are to present the definition of Artificial Intelligence; to explain what Expert System and System for Decision Support are and its application in the field of health and to discuss some expert systems for differential diagnosis of urinary incontinence. It is concluded that expert systems may be useful not only for teaching purposes, but also as decision support in daily clinical practice. Despite this, for several reasons, health professionals usually hesitate to use the computer expert system to support their decision making process.; O diagnóstico diferencial dos tipos de incontinência urinária é algumas vezes difícil de estabelecer. Via de regra, somente os resultados de exames urodinâmicos permitem um diagnóstico acurado. Entretanto, esse exame nem sempre é factível, porque requer equipamento especial e também pessoal treinado para realizar e interpretar o exame. Alguns sistemas especialistas têm sido desenvolvidos para assistir profissionais que atuam nessa área. Propõe-se aqui apresentar a definição de inteligência artificial; explicar o que são sistemas especialistas...

The use of expert systems on the differential diagnosis of urinary incontinence

LOPES, Maria Helena Baena de Moraes; MARIN, Heimar de Fátima; ORTEGA, Neli Regina Siqueira; MASSAD, Eduardo
Fonte: Universidade de São Paulo, Escola de Enfermagem Publicador: Universidade de São Paulo, Escola de Enfermagem
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.28%
The differential diagnosis of urinary incontinence classes is sometimes difficult to establish. As a rule, only the results of urodynamic testing allow an accurate diagnosis. However, this exam is not always feasible, because it requires special equipment, and also trained personnel to lead and interpret the exam. Some expert systems have been developed to assist health professionals in this field. Therefore, the aims of this paper are to present the definition of Artificial Intelligence; to explain what Expert System and System for Decision Support are and its application in the field of health and to discuss some expert systems for differential diagnosis of urinary incontinence. It is concluded that expert systems may be useful not only for teaching purposes, but also as decision support in daily clinical practice. Despite this, for several reasons, health professionals usually hesitate to use the computer expert system to support their decision making process.; O diagnóstico diferencial dos tipos de incontinência urinária é algumas vezes difícil de estabelecer. Via de regra, somente os resultados de exames urodinâmicos permitem um diagnóstico acurado. Entretanto, esse exame nem sempre é factível, porque requer equipamento especial e também pessoal treinado para realizar e interpretar o exame. Alguns sistemas especialistas têm sido desenvolvidos para assistir profissionais que atuam nessa área. Propõe-se aqui apresentar a definição de inteligência artificial; explicar o que são sistemas especialistas...

The use of expert systems on the differential diagnosis of urinary incontinence

Lopes,Maria Helena Baena de Moraes; Marin,Heimar de Fátima; Ortega,Neli Regina Siqueira; Massad,Eduardo
Fonte: Universidade de São Paulo, Escola de Enfermagem Publicador: Universidade de São Paulo, Escola de Enfermagem
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2009 EN
Relevância na Pesquisa
66.28%
The differential diagnosis of urinary incontinence classes is sometimes difficult to establish. As a rule, only the results of urodynamic testing allow an accurate diagnosis. However, this exam is not always feasible, because it requires special equipment, and also trained personnel to lead and interpret the exam. Some expert systems have been developed to assist health professionals in this field. Therefore, the aims of this paper are to present the definition of Artificial Intelligence; to explain what Expert System and System for Decision Support are and its application in the field of health and to discuss some expert systems for differential diagnosis of urinary incontinence. It is concluded that expert systems may be useful not only for teaching purposes, but also as decision support in daily clinical practice. Despite this, for several reasons, health professionals usually hesitate to use the computer expert system to support their decision making process.

Expert Systems: Where Are We? And Where Do We Go from Here?

Davis; Randall
Fonte: MIT - Massachusetts Institute of Technology Publicador: MIT - Massachusetts Institute of Technology
Formato: 40 p.; 16005394 bytes; 11660798 bytes; application/postscript; application/pdf
EN_US
Relevância na Pesquisa
66.17%
Work on Expert Systems has received extensive attention recently, prompting growing interest in a range of environments. Much has been made of the basic concept and the rule-based system approach typically used to construct the programs. Perhaps this is a good time then to review what we know, assess the current prospects, and suggest directions appropriate for the next steps of basic research. I'd like to do that today and propose to do it by taking you on a journey of sorts, a metaphorical trip through the State of the Art of Expert Systems. We'll wander about the landscape, ranging from the familiar territory of the Land of Accepted Wisdom, to the vast unknowns at the Frontiers of Knowledge. I guarantee we'll all return safely, so come along...

Exploring the factors associated with expert systems success

Guimaraes,Tor; Yoon,Youngohc; O’Neal,Quinton
Fonte: Universidade Federal de São Carlos Publicador: Universidade Federal de São Carlos
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/1997 EN
Relevância na Pesquisa
66.24%
As the widespread use and company dependency on Expert Systems increase, so does the need to assess their value and to ensure implementation success. This study identified and empirically tested eight major variables proposed in the literature as determinants of ES success, in this case measured in terms of user satisfaction. IBM's Corporate Manufacturing Expert Systems Project Center collected information from 69 project managers to support the study. The results clearly support the hypothesized relationships and suggest the need for ES project managers to pay special attention to these determinants of ES implementation success. ES success is directly related to the quality of developers and of the ES shells used, end-user characteristics and degree of user involvement in ES development, as each has been defined in this study. For exploratory purposes, the component items for each of these major variables were correlated with the components of user satisfaction. Based on the results, several recommendations are proposed for ES project managers to enhance the likelihood of project success, including: adding problem difficulty as a criterion for ES application selection; increasing ES developer training to improve their people skills...

Teraphim: a domain-independent framework for constructing blackboard-controlled, blackboard-based expert systems in Prolog

Lyon, Bruce
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
66.25%
The blackboard architecture, in which a set of independent knowledge sources communicate by means of a global data base known as a blackboard, has been suggested as a generally useful design for knowledge-based systems. Teraphim is a domain-independent frame work for writing blackboard-based expert systems in Prolog. It implements concepts common to a range of previous blackboard architecture programs, such as HEARSAY-III and BB1. Teraphim includes as its basic elements a partitioned blackboard, a simple blackboard-controlled scheduler, a set of general-purpose scheduling heuristics to control the scheduler, a generic knowledge source with the ability to ask the user questions about incomplete data, modifiable methods of reasoning about uncertain data, and a simple explanation facility that traces the origins of terms on the problem blackboard. Trials of the system indicate that it can be used to implement expert systems to solve either synthesis or analysis problems. The blackboard architecture of Teraphim lends itself to experimentation with the kinds of knowledge representation and control knowledge needed to solve problems. Prolog proved to be a convenient language for writing blackboard-based systems.

A Comparative study of four major knowledge representation techniques used in expert systems with an implementation in Prolog

Hudgick, JoAnn T.
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
66.17%
Knowledge representation is a central issue in Artifical Intelligence (AI) research. In order to solve the diverse and complex problems encountered, one needs both a large amount of knowledge and some mechanism for the management and skillful utilization of that knowledge. The basic problem in knowledge representation is the development of an adequate formalism to represent that knowledge. In this thesis I will discuss four of the major techniques for representing knowledge in expert systems: first order logic, production rules, semantic networks, and frames. Using Prolog as the implementation language, I will demonstrate that all of the above mentioned representation techniques, when used in actual implementations, will be reduced to an equivalency - that being a set of Prolog facts and rules. Prolog limits us to a set of facts expressed as "predicate(argumentl, argument, ..., argumentn)" and "IF ... THEN" rules, thus eliminating many of the unique features which characterize the various representation techniques. Therefore, Prolog can be viewed as a representation technique itself.

Geneplanner: A Prototype of an expert system to assist with chemical DNA gene synthesis planning

Daum, Marilyn
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
56.29%
Expert systems are a popular area of artificial intelligence. The development of an expert system involves the selection of an appropriate problem, acquisition of knowledge from the expert, selection of control mechanisms and knowledge repre sentations, selection of tools, implementation, and testing. This thesis describes the development of a prototype expert system in the area of genetic engineering. The prototype system suggests the fragments of DNA to chemically synthesize and the steps for joining these fragments in order to make a gene. The system follows the hueristic rules of an expert to select the fragments and strategy for synthesis, backtracking where necessary. After reviewing expert systems and the problem area, the thesis focuses on the development process. Each of the steps is discussed, and the iterative nature of implementation, testing, and refinement is displayed. Results are reviewed, showing Geneplanner to handle simple to moder ate cases fairly well. Finally, shortcomings are discussed and future enhancements are suggested.

A Toolkit for uncertainty reasoning and representation using fuzzy set theory in PROLOG expert systems

Bicker, Marcelle M.
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
66.3%
This thesis examines the issue of uncertainty reasoning and representation in expert systems. Uncertainty and expert systems are defined. The value of uncertainty in expert systems as an approximation of human reasoning is stressed. Five alternative methods of dealing with uncertainty are explored. These include Bayesian probabilities, Mycin confirmation theory, fuzzy set theory, Dempster-Shafer's theory of evidence and a theory of endorsements. A toolkit to apply uncertainty processing in PROLOG expert systems is developed using fuzzy set theory as the basis for uncertainty reasoning and representation. The concepts of fuzzy logic and approximate reasoning are utilized in the implementation. The toolkit is written in C-PROLOG for the PYRAMID UNIX system at the Rochester Institute of Technology.

Uso de sistemas especialistas para o diagnóstico diferencial de incontinência urinária; Uso de los sistemas especialistas en el diagnóstico diferencial de la incontinencia urinaria; The use of expert systems on the differential diagnosis of urinary incontinence

Lopes, Maria Helena Baena de Moraes; Marin, Heimar de Fátima; Ortega, Neli Regina Siqueira; Massad, Eduardo
Fonte: Universidade de São Paulo. Escola de Enfermagem Publicador: Universidade de São Paulo. Escola de Enfermagem
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/09/2009 ENG
Relevância na Pesquisa
66.28%
O diagnóstico diferencial dos tipos de incontinência urinária é algumas vezes difícil de estabelecer. Via de regra, somente os resultados de exames urodinâmicos permitem um diagnóstico acurado. Entretanto, esse exame nem sempre é factível, porque requer equipamento especial e também pessoal treinado para realizar e interpretar o exame. Alguns sistemas especialistas têm sido desenvolvidos para assistir profissionais que atuam nessa área. Propõe-se aqui apresentar a definição de inteligência artificial; explicar o que são sistemas especialistas, sistemas de apoio à decisão e sua aplicação na área da saúde e, discutir alguns sistemas especialistas desenvolvidos para o diagnóstico diferencial da incontinência urinária. Conclui-se que esses sistemas podem ser úteis não somente para o ensino, mas também como apoio à decisão na prática clínica diária. A despeito disso, por várias razões, os profissionais de saúde usualmente hesitam em usar o sistema especialista computacional para dar suporte ao processo de decisão.; El diagnóstico diferencial de los tipos de incontinencia urinaria es algunas veces difícil. En general, solamente los resultados de exámenes urodinâmicos permiten uno diagnóstico preciso. Entretanto...

A COMPARISON BETWEEN EXPERT SYSTEMS AND AUTONOMIC COMPUTING PLUS MOBILE AGENT APPROACHES FOR FAULT MANAGEMENT.

GUTIÉRREZ,SERGIO ARMANDO; BRANCH,JOHN WILLIAN
Fonte: DYNA Publicador: DYNA
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2011 EN
Relevância na Pesquisa
66.17%
In this article, a revision of literature on application of expert systems to fault management is presented. Then, a new approach, based on the autonomic computing paradigm and mobile agents technology is introduced. The main features of this new approach are compared to equivalent ones of expert systems. Benefits of the schema based on mobile agents are presented.