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1

Refactoring OCL Annotated UML Class Diagrams  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Refactoring of UML class diagrams is an emerging research topic and heavily inspired by refactoring of program code written in objectoriented implementation languages. Current class diagram refactoring techniques concentrate on the diagrammatic part but neglect OCL constraints that might become synt...

Markovi?, Slaviša; Baar, Thomas

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Synchronizing Refactored UML Class Diagrams and OCL Constraints  

Digital Repository Infrastructure Vision for European Research (DRIVER)

UML class diagrams are usually annotated with OCL expressions that constrain their possible instantiation. In our work we have investigated how OCL annotations can be automatically updated each time the underlying diagram is refactored. All our refactoring rules are formally specified using a QVT-ba...

Markovi?, Slaviša; Baar, Thomas

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Semantic annotation of requirements for automatic UML class diagram generation  

Directory of Open Access Journals (Sweden)

Full Text Available The increasing complexity of software engineering requires effective methods and tools to support requirements analysts' activities. While much of a company's knowledge can be found in text repositories, current content management systems have limited capabilities for structuring and interpreting documents. In this context, we propose a tool for transforming text documents describing users' requirements to an UML model. The presented tool uses Natural Language Processing (NLP) and semantic rules to generate an UML class diagram. The main contribution of our tool is to provide assistance to designers facilitating the transition from a textual description of user requirements to their UML diagrams based on GATE (General Architecture of Text) by formulating necessary rules that generate new semantic annotations.

Soumaya Amdouni; Soumaya Amdouni; Wahiba Ben Abdessalem Karaa; Sondes Bouabid

2011-01-01

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Semantic annotation of requirements for automatic UML class diagram generation  

CERN Multimedia

The increasing complexity of software engineering requires effective methods and tools to support requirements analysts' activities. While much of a company's knowledge can be found in text repositories, current content management systems have limited capabilities for structuring and interpreting documents. In this context, we propose a tool for transforming text documents describing users' requirements to an UML model. The presented tool uses Natural Language Processing (NLP) and semantic rules to generate an UML class diagram. The main contribution of our tool is to provide assistance to designers facilitating the transition from a textual description of user requirements to their UML diagrams based on GATE (General Architecture of Text) by formulating necessary rules that generate new semantic annotations.

Amdouni, Soumaya; Bouabid, Sondes

2011-01-01

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A Formative Assessment Tool for Conceptual Database Design Using UML Class Diagram  

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Full Text Available Database design is one of the main topics of any introductory database course. Traditionally, for teaching it entity-relationship diagrams (ERD) are used. However, in the last years, Unified Modeling Language (UML) has emerged as an effective modeling tool for database design. In this paper we present a web-based tool designed to give support to teaching and learning conceptual database design using UML class diagrams. The proposed UML environment is an effective tool for formative assessment since it is capable of correcting automatically UML class diagrams exercises providing immediate feedback to the student. The tool is part of a more general framework, denoted ACME, which provides the main functionalities of an e-learning platform. The tool has been used in a first experimental group of an introductory database course

Josep Soler; Imma Boada; Ferran Prados; Jordi Poch; Ramon Fabregat

2010-01-01

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Reverse engineering of the UML class diagram from C++ code in presence of weakly typed containers  

CERN Multimedia

UML diagrams, and in particular the most frequently used one, the class diagram, represent a valuable source of information even after the delivery of the system, when it enters the maintenance phase. Several tools provide a reverse engineering engine to recover it from the code. In this paper, an algorithm is proposed for the improvement of the accuracy of the UML class diagram extracted from the code. Specifically, important information about inter-class relations may be missed in a reverse engineered class diagram, when weakly typed containers, i.e., containers collecting objects whose type is the top of the inheritance hierarchy, are employed. In fact, the class of the contained objects is not directly known, and therefore no relation with it is apparent from the container declaration. The proposed approach was applied to several software components developed at CERN. Experimental results highlight that a substantial improvement is achieved when the container type information is refined with the inferred ...

Tonella, Paolo

2001-01-01

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From use cases to UML class diagrams using logic grammars and constraints  

DEFF Research Database (Denmark)

We investigate the possibilities for automated transition from Use Cases in a restricted natural language syntax into UML class diagrams, by trying to capture the semantics of the natural language and map it into building blocks of the object oriented programming paradigm (classes, objects, methods, properties etc.). Syntax and semantic analysis is done in a framework of Definite Clause Grammars extended with Constraint Handling Rules, which generalizes previous approaches with a direct way to express domain knowledge utilized in the interpretation process as well as stating explicit rules for pronoun resolution. The latter involves an improvement of earlier work on assumptions with time stamps.

Christiansen, Henning; Have, Christian Theil

2007-01-01

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UN MÉTODO PARA EL REFINAMIENTO INTERACTIVO DEL DIAGRAMA DE CLASES DE UML/ A METHOD FOR INTERACTIVE REFINEMENT OF UML CLASS DIAGRAM  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Durante el proceso de elicitación de requisitos se presentan problemas de comunicación entre analistas e interesados que suelen ocasionar pérdidas de requisitos funcionales. Estas pérdidas se aminoran mediante el refinamiento de los esquemas conceptuales, en particular el diagrama de clases de UML. Existen algunos acercamientos al refinamiento del diagrama de clases, pero que no realizan ciclos de interacción con el interesado; otros enfoques realizan refinamiento in (more) teractivo del diagrama entidad-relación, un diagrama que no posee toda la información contenida en el diagrama de clases. En este artículo se realiza el refinamiento del diagrama de clases de UML mediante la interacción con el interesado. Para ello, se proponen reglas de completitud que se disparan en lenguaje natural y se emplea un corpus de diagramas de clases para complementar el conocimiento del analista en un determinado dominio. El análisis de completitud propuesto se ilustra con un prototipo en la herramienta UNC-Diagramador y se ejemplifica con un caso de estudio. Abstract in english Along the requirements elicitation process, communication problems appear between analysts and stakeholders; usually, these problems cause losing of functional requirements. Refinement of conceptual schemas-particularly class diagram-lessens the impact of these losses. Some approaches to the refinement of class diagram have been proposed, but they do not evidence cycles of interaction with the stakeholder; other approaches show interactive refinement of the Entity-Relatio (more) nship diagram, which does not have all the information contained in class diagram. In this paper, we propose the refinement of UML class diagram through interaction with stakeholders. To achieve this goal, we propose completeness rules in natural language and the use of a corpus of class diagrams for complementing the analyst knowledge in a specific domain. Finally, we illustrate completeness analysis with a prototype in the UNC-Diagrammer tool and we propose a case study.

M. ZAPATA, CARLOS; MARY ESTRADA, BETSY; ARANGO I, FERNANDO

2007-11-01

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REFINAMIENTO DEL DIAGRAMA DE CLASES UML A ORACLE®9I EN ATOM3/ UML CLASS DIAGRAM  ORACLE® 9I REFINEMENT IN ATOM  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish El OMG define el refinamiento como el proceso de transformación desde un modelo independiente de la plataforma de implementación hacia un modelo específico de la plataforma de implementación. Las herramientas CASE convencionales han experimentado problemas con este tipo de transformación, debido a la definición estática de los modelos incluidos en ellas, a las dificultades para la definición de reglas de transformación y al pobre rendimiento mostrado por ellas en (more) la obtención de código. Las herramientas MetaCASE han surgido con nuevas capacidades para mejorar el refinamiento en el contexto de la transformación entre modelos. En este artículo se presenta una implementación en AToM3 para refinamiento que transforma un diagrama de clases UML independiente de la plataforma de implementación a un diagrama de clases UML dependiente de la plataforma de implementación Oracle® 9i. Además, se muestra el uso de esta clase de refinamiento con un caso de estudio. Abstract in english Defined by OMG, Refinement is a transformation process from a platform independent model to a platform specific model. CASE Tools have experienced problems with this kind of transformation, because of the static definition of metamodels included on them, difficulties for defining transformation rules and the poor performance showed by them in code obtaining. MetaCASE Tools have emerged with new capabilities for improving the refinement in the context of model transformati (more) on. In this paper, we present an AToM3-based implementation for refinement between a platform-independent UML Class Diagram and an Oracle® 9i-platform UML Class Model. Furthermore, we show the use of this kind of refinement with a study case.

ZAPATA, CARLOS M.; ÁLVAREZ, CARLOS A.; ARANGO I., FERNANDO

2007-03-01

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ROLE OF UML SEQUENCE DIAGRAM CONSTRUCTS IN OBJECT LIFECYCLE CONCEPT  

Digital Repository Infrastructure Vision for European Research (DRIVER)

When modeling systems and using UML concepts, a real system can be viewed in several ways. The RUP (Rational Unified Process) defines the "4 + 1 view": 1. Logical view (class diagram (CD), object diagram (OD), sequence diagram (SD), collaboration diagram (COD), state chart diagram (SCD), activity di...

Miroslav Grgec; Robert Mužar

11

Supporting UML Sequence Diagrams with a Processor Net Approach  

Directory of Open Access Journals (Sweden)

Full Text Available UML sequence diagrams focus on the interaction between different classes. For distributed real time transaction processing it is possible to end up with complex sequence diagrams, containing messages related to system processes. It is difficult to examine alternative combinations of message passing. A solution is to translate these diagrams into an executable processor net model. This is based on the ‘actor model’, Petri net concepts and higher order net constructs. A case study taken from a flight reservation scenario is introduced and used to create a processor net model. This approach offers various advantages like identifying the main processes, executable model creation, verification, formalization, defining schemas and performance analysis.

Tony Spiteri Staines

2007-01-01

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ROLE OF UML SEQUENCE DIAGRAM CONSTRUCTS IN OBJECT LIFECYCLE CONCEPT  

Directory of Open Access Journals (Sweden)

Full Text Available When modeling systems and using UML concepts, a real system can be viewed in several ways. The RUP (Rational Unified Process) defines the "4 + 1 view": 1. Logical view (class diagram (CD), object diagram (OD), sequence diagram (SD), collaboration diagram (COD), state chart diagram (SCD), activity diagram (AD)), 2.Process view (use case diagram, CD, OD, SD, COD, SCD, AD), 3. Development view (package diagram, component diagram), 4. Physical view (deployment diagram), and 5. Use case view (use case diagram, OD, SD, COD, SCD, AD) which combines the four mentioned above. With sequence diagram constructs we are describing object behavior in scope of one use case and their interaction. Each object in system goes through a so called lifecycle (create, supplement object with data, use object, decommission object). The concept of the object lifecycle is used to understand and formalize the behavior of objects from creation to deletion. With help of sequence diagram concepts our paper will describe the way of interaction modeling between objects through lifeline of each of them, and their importance in software development.

Miroslav Grgec; Robert Mužar

2007-01-01

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Comparative Study on DFD to UML Diagrams Transformations  

CERN Multimedia

Most of legacy systems use nowadays were modeled and documented using structured approach. Expansion of these systems in terms of functionality and maintainability requires shift towards object-oriented documentation and design, which has been widely accepted by the industry. In this paper, we present a survey of the existing Data Flow Diagram (DFD) to Unified Modeling language (UML) transformation techniques. We analyze transformation techniques using a set of parameters, identified in the survey. Based on identified parameters, we present an analysis matrix, which describes the strengths and weaknesses of transformation techniques. It is observed that most of the transformation approaches are rule based, which are incomplete and defined at abstract level that does not cover in depth transformation and automation issues. Transformation approaches are data centric, which focuses on data-store for class diagram generation. Very few of the transformation techniques have been applied on case study as a proof of ...

Jilani, Atif A A; Nadeem, Aamer

2011-01-01

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Improving The Decisional Process By Using UML Diagrams  

Directory of Open Access Journals (Sweden)

Full Text Available In the last years, the world has moved from predominantly industrial society to information society, governed by a new set of rules, which allows access to digital technologies, processing, storage and transmission of information. Organizations include in their decisional process Business Intelligence components, which help the decision-makers to establish the conditions of financial equilibrium, to highlight weaknesses and strengths, to make predictions.Particularly, Unified Modelling Language (UML), as a formal and standardized language, allows the control of the system’s complexity, shows different but complementary views of the organization and ensures independence towards the implementation language and the domain of application. This article aims to show the way UML diagrams are used as support in a decisional process for a hotel company. UML diagrams designed help decisionmakers to analysis and discover the causes, to design and simulation of possible scenarios, to implement and measuring the results.

Udrica Mioara; Marius Iulian; Opri? Violeta Nicoleta; Ioni?? R?zvan Hora?iu

2012-01-01

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Comparative Study on DFD to UML Diagrams Transformation  

Directory of Open Access Journals (Sweden)

Full Text Available Most of legacy systems use nowadays were modeled and documented using structured approach. Expansion of these systems in terms of functionality and maintainability requires shift towards object-oriented documentation and design, which has been widely accepted by the industry. In this paper, we present a survey of the existing Data Flow Diagram (DFD) to Unified Modeling language (UML) transformation techniques. We analyze transformation techniques using a set of parameters, identified in the survey. Based on identified parameters, we present an analysis matrix, which describes the strengths and weaknesses of transformation techniques. It is observed that most of the transformation approaches are rule based, which are incomplete and defined at abstract level that does not cover in depth transformation and automation issues. Transformation approaches are data centric, which focuses on datastore for class diagram generation. Very few of the transformation techniques have been applied on case study as a proof of concept, which are not comprehensive and majority of them are partially automated.

Atif A. A. Jilani; Muhammad Usma; Aamer Nadeem; Zafar I. Malik; Zahid Halim

2011-01-01

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A Critical Analysis and Treatment of Important UML Diagrams Enhancing Modeling Power  

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Full Text Available Requirements analysis and design specification are serious issues in systems development because of the semantics involved in transformation of real world problems to computer software systems. Although unified modeling language (UML) is now accepted as a de facto standard for design and specification of object oriented systems but its structures have various disadvantages. For example, it lacks of defining semantics of the systems to be developed. Formal me-thods are proved powerful, particularly, at requirement specification and design level. To address and realize the bene-fits of UML and formal methods our project on “formalization of UML diagrams using Z notation” is under progress. This paper is continuation of the same project in which some important diagrams namely use case, class and sequence diagrams are selected for critical analysis. Merits and demerits of the diagrams are addressed after a brief introduction. Applications of the diagrams are observed reducing complexity and proposing a good design of a system. Finally, a treatment to link diagrams with appropriate approaches is suggested to enhance modeling power of UML for facilitating the systems development.

Fahad Alhumaidan

2012-01-01

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ISSUES CONCERNING THE USE OF UML DIAGRAMS TO DEFINE THE UNDERLYING PROCESS MODEL SIMULATION  

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Full Text Available Diagrams are a graphical representation of the information contained in a UML model, and are an essential feature of UML modelling. Each UML diagram is designed to let you view a software system from a different perspective and to varying levels of abstraction.

MIOARA UDRIC?; TEODORA V?TUIU; ADRIAN GHENCEA

2011-01-01

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On the impact of layout quality to understanding UML diagrams  

DEFF Research Database (Denmark)

Practical experience suggests that use and understanding of UML diagrams is greatly affected by the quality of their layout. However, existing experimental evidence for this effect is been weak and inconclusive. In this paper, we explore two explanations. Firstly, we observe that the visual qualities of diagrams are more prominent in earlier life cycle phases so that the impact of layout quality should be more apparent in models and diagram types used there, an aspect not studied in previous research. Secondly, in practice, good layouts use many different heuristics simultaneously whereas previous research considered them in isolation only. In this paper, we report the results of a series of controlled experiments using compound layouts on requirements analysis models. With very high significance, we find a notable impact of the layout quality measured by different aspects of cognitive load.

Störrle, Harald

2011-01-01

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On the Impact of Layout Quality to Understanding UML Diagrams: Diagram Type and Expertise  

DEFF Research Database (Denmark)

Practical experience suggests that the use and understanding of UML diagrams is greatly affected by the quality of their layout. In previous work, we have presented evidence supporting this intuition. This contrasts with earlier experiments that yielded weak or inconclusive evidence only. In the current paper, we expand on our earlier experiments by varying both diagram types and populations studied. We find no difference in the beneficial evidence of good layout wrt. diagram types. We also find support for the hypothesis that experts benefit less than novices. While still lacking independent replication of our earlier results, these results add further evidence in support of our hypothesis.

Störrle, Harald

2012-01-01

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DEFINITION OF A SEMANTIC PLATAFORM FOR AUTOMATED CODE GENERATION BASED ON UML CLASS DIAGRAMS AND DSL SEMANTIC ANNOTATIONS/ DEFINICIÓN DE UNA PLATAFORMA SEMÁNTICA PARA LA GENERACIÓN AUTOMÁTICA DE CÓDIGO BASADA EN DIAGRAMAS DE CLASES UML Y ANOTACIONES SEMÁNTICAS EN UN DSL  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish En este trabajo se propone una plataforma semántica de servicios que implementan los pasos de un método para la generación automática de código. El método se basa en información semántica y en MDA (model-driven architecture). La generación de código se logra relacionando semánticamente operaciones en diagramas de clases en UML (unified modeling language) con operaciones implementadas. La relación entre operaciones se hace consultando operaciones implementadas (more) que tengan la misma postcondición de la operación bajo implementación. El código resultante es una secuencia de invocaciones a operaciones implementadas que, en conjunto, alcancen la postcondición de la operación bajo implementación. La semántica se especifica mediante un DSL (domain-specific language), también definido en este artículo. Los servicios de la plataforma y el método se prueban mediante un caso de estudio. Abstract in english In this paper, we propose a semantic service platform for implementing the steps of a semantic- and model-driven architecture (MDA)-based method for automated code generation. The code generation is achieved by semantically relating operations in unified modeling language (UML) class diagrams with implemented operations. The relationship among operations is achieved by finding implemented operations with the same post-condition of the operation under implementation. The r (more) esultant code is a sequence of invocations to the implemented operations which, acting as a whole, achieve the post-condition of the operation under implementation. Semantics is specified by means of a domain-specific language (DSL), also defined in this paper. Services of the platform and the method are shown in execution in a case study.

MUÑETÓN, ANDRÉS; ZAPATA, CARLOS

2012-04-01

 
 
 
 
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CONVERSION STRATEGY OF A SYSTEM OF COLLABORATING DESIGN PATTERNS INTO UML DIAGRAM FOR DESIGN PATTERN  

Directory of Open Access Journals (Sweden)

Full Text Available In a past publication, a proposal of a new set of UML diagram designed to picture a software system at architectural level by showing which patterns are being used has been presented. Progressing from the proposal, this publication presents an extensive example to precisely show the way to make the conversion. In this paper we present the proof of the ability of the proposed diagram set to professionally and neatly picture the overall high level architecture of a software system. There is also an additional rule added to the one presented in the past publication. This new rule is to cater for the cases where collaborating patterns are not overlapping; rather they are related just because some class in one pattern is using some other class in the other pattern.

Muhazam Mustapha; Nik Ghazali Nik Daud; Indika Udawatta; Manjula Atapattu

2011-01-01

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UML 2 Semantics and Applications  

CERN Multimedia

A coherent and integrated account of the leading UML 2 semantics work and the practical applications of UML semantics development With contributions from leading experts in the field, the book begins with an introduction to UML and goes on to offer in-depth and up-to-date coverage of: The role of semantics Considerations and rationale for a UML system model Definition of the UML system model UML descriptive semantics Axiomatic semantics of UML class diagrams The object constraint language Axiomatic semantics of state machines A coalgebraic semantic framework for reasoning about interaction des

Lano, Kevin

2009-01-01

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State Based Static and Dynamic Formal Analysis of UML State Diagrams  

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Full Text Available Design and specification is a serious issue in software engineering because of the semantics involved in transforming the real world problems to computer software systems. Unified Modeling Language (UML) has been accepted as a de facto standard for design and specification of object oriented systems. Unfortunately, UML structures lack defining semantics of a system. Formal methods are proved powerful, particularly, at requirement specification and design level. For a moment, formal methods are not welcomed because of much use of mathematics in formal languages. Therefore, a linkage between UML and formal methods is required to overcome the above deficiencies. In this paper, a new approach is developed by integrating UML and Z specification focusing on state diagram considering both the syntax and semantics. It is believed that this new approach will be effective and useful both at academics and industrial level. The resultant formal models of the approach are analyzed and validated using Z/Eves tool.

Fahad Alhumaidan

2012-01-01

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Semantics of UML 2.0 Activity Diagram for Business Modeling by Means of Virtual Machine  

CERN Multimedia

The paper proposes a more formalized definition of UML 2.0 Activity Diagram semantics. A subset of activity diagram constructs relevant for business process modeling is considered. The semantics definition is based on the original token flow methodology, but a more constructive approach is used. The Activity Diagram Virtual machine is defined by means of a metamodel, with operations defined by a mix of pseudocode and OCL pre- and postconditions. A formal procedure is described which builds the virtual machine for any activity diagram. The relatively complicated original token movement rules in control nodes and edges are combined into paths from an action to action. A new approach is the use of different (push and pull) engines, which move tokens along the paths. Pull engines are used for paths containing join nodes, where the movement of several tokens must be coordinated. The proposed virtual machine approach makes the activity semantics definition more transparent where the token movement can be easily tra...

Vitolins, V; Vitolins, Valdis; Kalnins, Audris

2005-01-01

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Applying Genetic Algorithm for Prioritization of Test Case Scenarios Derived from UML Diagrams  

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Full Text Available Software testing involves identifying the test cases which discover errors in the program. However, exhaustive testing of software is very time consuming. In this paper, a technique is proposed to prioritize test case scenarios by identifying the critical path clusters using genetic algorithm. The test case scenarios are derived from the UML activity diagram and state chart diagram. The testing efficiency is optimized by applying the genetic algorithm on the test data. The information flow metric is adopted in this work for calculating the information flow complexity associated with each node of the activity diagram and state chart diagram. If the software requirements change, the software needs to be modified and this requires re - testing of the software. Hence, to take care of requirements change, a stack based approach for assigning weights to the nodes of activity diagram and state chart diagram has also been proposed. In this paper, we have extended our previous work of generating test case scenarios from activity diagram by also considering the concurrent activities in nested activity diagram.

Sangeeta Sabharwal; Ritu Sibal; Chayanika Sharma

2011-01-01

26

Translating alloy apecifications to UML class diagrams annotated with OCL  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Model-Driven Engineering (MDE) is a Software Engineering approach based on model transformations at different abstraction levels. It prescribes the development of software by successively transforming models from abstract (specifications) to more concrete ones (code). Alloy is an increasingly popula...

Garis, Ana; Cunha, Alcino; Riesco, Daniel

27

Model Based Test Case Prioritization For Testing Component Dependency In CBSD Using UML Sequence Diagram  

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Full Text Available Software maintenance is an important and costly activity of the software development lifecycle. To ensure proper maintenance the software undergoes regression testing. It is very inefficient to re execute every test case in regression testing for small changes. Hence test case prioritization is a technique to schedule the test case in an order that maximizes some objective function. A variety of objective functions are applicable, one such function involves rate of fault detection - a measure of how quickly faults are detected within the testing process. Early fault detection can provide a faster feedback generating a scope for debuggers to carry out their task at an early stage. In this paper we propose a method to prioritize the test cases for testing component dependency in a Component Based Software Development (CBSD) environment using Greedy Approach. An Object Interaction Graph (OIG) is being generated from the UML sequence diagrams for interdependent components. The OIG is traversed to calculate the total number of inter component object interactions and intra component object interactions. Depending upon the number of interactions the objective function is calculated and the test cases are ordered accordingly. This technique is applied to components developed in Java for a software system and found to be very effective in early fault detection as compared to non-prioritize approach

Arup Abhinna Acharya; Durga Prasad Mohapatra; Namita Panda

2011-01-01

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UN PATRÓN DE INTERACCIÓN ENTRE DIAGRAMAS DE ACTIVIDADES UML Y SISTEMAS WORKFLOW AN INTERACTION PATTERN BETWEEN UML ACTIVITY DIAGRAMS AND WORKFLOW SYSTEMS  

Directory of Open Access Journals (Sweden)

Full Text Available Actualmente en los ambientes de desarrollo de software hay un gran interés en buscar y desarrollar técnicas que puedan integrar los sistemas transaccionales con los flujos de trabajo que soportan los procesos del negocio de las organizaciones. Sin embargo, en la industria del software no es común encontrar técnicas o prácticas que faciliten el desarrollo de los modelos del sistema en función de los procesos del negocio. En este artículo se define un patrón de desarrollo que estandariza la interacción entre diagramas de actividades de UML 2.0, que representan las operaciones de un sistema, y procesos del negocio automatizados bajo tecnologías workflow. La trazabilidad de dicha interacción se mantiene por medio de modelos de trazabilidad que controlan la evolución de las operaciones del negocio y del sistema. Para mostrar la aplicación del patrón se desarrolla un caso de estudioIn software development environments there is a big interest to look and develop techniques that could integrate transactional systems with Workflow systems in order to support the business processes in organizations Nevertheless, in the software industry it is not common to find techniques or practices that facilitate the development of system models according to the business processes. In this article we define a development pattern to standardize the interaction between UML 2.0 activity diagrams, which represent the operations of a system, and the business processes automated by means of Workflow technologies. The traceability of the above mentioned interaction is supported by means of traceability models that control the evolution of both operations of the business and of the system. To show the application of the pattern a case study is developed.

Marta Silvia Tabares; Juan Diego Pineda; Andrés Felipe Barrera

2008-01-01

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Using UML State Diagrams for Modelling the Performance of Parallel Programs/ Uso de Diagramas de Estado UML para la Modelación del Desempeño de Programas Paralelos  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Hay muchas posibilidades para diseñar un programa paralelo a fin de obtener el mejor desempeño posible. La selección de una estructura del programa, así como una organización de procesos, impacta sobre el desempeño a lograrse, y depende del problema a resolver. Ahora bien, para seleccionar una estructura del programa como la mejor en términos de desempeño, el diseñador de software requiere de técnicas de modelación para evaluar diferentes opciones. Si la estruc (more) tura de un programa paralelo puede modelarse como un conjunto de procesos interactivos, descritos en términos de Diagramas de Estado de UML, este artículo presenta una modelación para estimar el tiempo de ejecución promedio de un programa paralelo, descrito como un conjunto de procesos que corren en tiempos de ejecución con distribuciones determinística y exponencial. Abstract in english There are many possibilities to design a parallel program in order to obtain the best performance possible. The selection of a program structure, as an organisation of processes, impacts on the performance to be achieved, and depends on the problem to be solved. Now, in order to select a program structure as the best in terms of performance, the software designer requires performance modelling techniques to evaluate different alternatives. If the structure of the parallel (more) program can be modelled as a set of interacting processes, described in terms of UML State Diagrams, this paper presents a performance modelling to estimate the average execution time of a parallel program. Performance modelling is achieved by calculating the average execution time of a parallel program, described as a set of processes which run with deterministically and exponentially distributed execution times.

Ortega Arjona, Jorge

2008-03-01

30

UN PATRÓN DE INTERACCIÓN ENTRE DIAGRAMAS DE ACTIVIDADES UML Y SISTEMAS WORKFLOW/ AN INTERACTION PATTERN BETWEEN UML ACTIVITY DIAGRAMS AND WORKFLOW SYSTEMS  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Actualmente en los ambientes de desarrollo de software hay un gran interés en buscar y desarrollar técnicas que puedan integrar los sistemas transaccionales con los flujos de trabajo que soportan los procesos del negocio de las organizaciones. Sin embargo, en la industria del software no es común encontrar técnicas o prácticas que faciliten el desarrollo de los modelos del sistema en función de los procesos del negocio. En este artículo se define un patrón de desa (more) rrollo que estandariza la interacción entre diagramas de actividades de UML 2.0, que representan las operaciones de un sistema, y procesos del negocio automatizados bajo tecnologías workflow. La trazabilidad de dicha interacción se mantiene por medio de modelos de trazabilidad que controlan la evolución de las operaciones del negocio y del sistema. Para mostrar la aplicación del patrón se desarrolla un caso de estudio Abstract in english In software development environments there is a big interest to look and develop techniques that could integrate transactional systems with Workflow systems in order to support the business processes in organizations Nevertheless, in the software industry it is not common to find techniques or practices that facilitate the development of system models according to the business processes. In this article we define a development pattern to standardize the interaction betwee (more) n UML 2.0 activity diagrams, which represent the operations of a system, and the business processes automated by means of Workflow technologies. The traceability of the above mentioned interaction is supported by means of traceability models that control the evolution of both operations of the business and of the system. To show the application of the pattern a case study is developed.

Tabares, Marta Silvia; Pineda, Juan Diego; Barrera, Andrés Felipe

2008-12-01

31

Extensión del Diagrama de Secuencias UML (Lenguaje de Modelado Unificado) para el Modelado Orientado a Aspectos/ Extension of UML Sequence Diagrams (Unified Modeling Language) to Aspect-Oriented Modeling  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Este trabajo revisa los principales elementos de diagrama de secuencia UML (Unified Modeling Language) para modelar el comportamiento dinámico de software y describe los pasos para alcanzar un modelado orientado a aspectos con esta herramienta. Esto con el objetivo de lograr una mayor autonomía y "limpieza" en el modelado e implementación de las tareas principales de una aplicación software. Para estos efectos, se describe la metodología de desarrollo de software ori (more) entado a objetos (DSOO) resaltándose la importancia del UML para el modelado de estructuras y comportamiento de aplicaciones software orientadas a objetos. Además, se mencionan las principales características de la metodología de desarrollo de software orientado a aspectos (DSOA) considerando DSOA como una extensión a DSOO. Esto hace necesario revisar y adaptar el UML para el soporte de modelado orientado a aspectos. En este contexto, se modela un caso de estudio clásico del método de DSOA. Abstract in english This article reviews the basic principles of UML sequence diagram (Unified Modeling Language) to model dynamic behavior of software and describes the steps needed to achieve an aspect-oriented modeling using this tool. This with the object of reaching greater autonomy and cleaning during the modeling and implementation of the main tasks of a software application. For these purposes, the object-oriented software development methodology (OOSD) is described remarking the imp (more) ortance of UML for the modeling of structures and behavior of object-oriented software applications. Furthermore, the main characteristics of the aspect-oriented software development methodology (AOSD) are mentioned, considering AOSD as an extension of OOSD. This makes it necessary for reviewing and adapting UML for the support of aspect-oriented modeling. In this context, a classic case study of the AOSD method is modeled.

Vidal, Cristian L; Schmal, Rodolfo F; Rivero, Sabino; Villarroel, Rodolfo H

2012-01-01

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TRANSFORMACIÓN DEL MODELO DE CLASES UML A Oracle9i® BAJO LA DIRECTIVA MDA: UN CASO DE ESTUDIO/ TRANSFORMATION FROM UML CLASS MODEL TO ORACLE9i® USING THE MDA GUIDELINES : A STUDY CASE  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish La Arquitectura Orientada a Modelos (MDA) es la propuesta de refinamiento de la OMG orientada a la generación automática de código a partir de los Modelos UML de Sistemas Independientes de la Plataforma de Implementación. En este trabajo se presenta una metodología para transformar el Modelo de Clases UML a un Modelo UML Dependiente de la Plataforma Oracle9i®, siguiendo los lineamientos básicos presentados por esta arquitectura y utilizando a UML como lenguaje de m (more) odelado a través de todos los pasos de dicha transformación. Inicialmente las reglas de transformación del Modelo de Clases de UML al Modelo Objeto-Relacional soportado por Oracle9i® son recopiladas en Español y adaptadas a nivel de metamodelo, para lo cual fue necesario elaborar un metamodelo simplificado de la plataforma Oracle9i®. Este conjunto de reglas se hace automatizable al expresarlas en un formalismo lógico, que sea fácilmente ejecutable por una herramienta CASE que soporte un lenguaje formal. Finalmente, se aplican las reglas de refinamiento formalizadas al Modelo de Clases de un Caso Práctico de estudio obteniendo como resultado, un Modelo UML instancia del Metamodelo de la Plataforma Oracle9i®. Los aspectos del Modelo de Clases en los que se hace énfasis en la transformación son las invariantes y reglas de derivación de atributos definidas en el lenguaje formal OCL, así como las relaciones de asociación, composición y generalización entre Clases. Abstract in english Model Driven Architecture (MDA) is the OMG refinement proposal directed to the automatic code generation from UML implementation platform independent models. This work presents a methodology for transforming UML Class Model to UML Platform Dependent Model for Oracle9i®, following the basic ideas proposed by MDA and using the UML language as the modeling language in the transformation process. Initially, transformation rules from UML class model to the relational-object m (more) odel supported by Oracle9i® are collected in spanish and adapted to metamodel level; to achieve it, it was necessary to elaborate a simplified Oracle9i® platform metamodel. This set of rules becomes automatizable when is expressed in a logical formalism, that is expected to be executed by a supporting formal language CASE tool. Finally, the formalized refinement rules are applied to UML class model from a practical study case, obtaining as a result an UML Model instance of Oracle9i® platform metamodel. Class Model aspects in which emphasize the transformation are the invariants and derivation rules of attributes defined in the OCL formal language, as well as the association, composition and generalization relationships between classes.

ARANGO, FERNANDO; GÓMEZ, MARÍA CLARA; ZAPATA, CARLOS M.

2006-07-01

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Connecting UML and VDM++ with Open Tool Support  

DEFF Research Database (Denmark)

Most formal method notations are text based, while tools used in industry often use graphical notations, such as UML. This paper demonstrates how the power of both approaches can be combined by providing the automatic translation of VDM++ models to and from UML. The translation is implemented as a plugin for the popular Eclipse development environment by the open-source Overture initiative. Both UML class diagrams and sequence diagrams can be translated, the latter enabling the novel ability to link with the combinatorial test facility of Overture.

Lausdahl, Kenneth; Listrup, Hans Kristian

2009-01-01

34

Implementación en C# de las reglas heurísticas de conversión de esquemas preconceptuales a diagramas uml 2.0/ Heuristic rules for transforming preconceptual schemas into uml 2.0 diagrams: a C# implementation  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Desde mediados de los años noventa se viene gestando una tendencia que busca la generación automática de esquemas conceptuales de UML a partir de lenguajes controlados, empleando para ello reglas heurísticas de transformación. En esta tendencia, aún subsisten algunos problemas: ambigüedad en las reglas, procesos semiasistidos con alta participación de expertos, dificultades en la representación conjunta de estructura y dinamismo del mundo, generación de un solo (more) diagrama y carencia de implementación de algunos trabajos. En este artículo se emplean los denominados Esquemas Preconceptuales como lenguaje gráfico de representación del dominio de una aplicación de software, y se implementan en C# las reglas de conversión de esos esquemas a diagramas de UML 2.0. La implementación en C# elimina la ambigüedad que podrían contener las reglas y permiten la automatización del proceso sin la mediación de expertos. Finalmente, se muestra mediante un caso de estudio el funcionamiento de un prototipo en C# basado en estas reglas. Abstract in english From the mid-nineties, a new path for automatically generating UML conceptual schemas from controlled languages, by means of heuristic rules, has been proposed. This path still exhibit problems to be solved: ambiguity of heuristic rules, semi-automated expert-participation processes, difficulties in representing structural and dynamic features of the domain, focus on only one diagram, and lack of implementation. In this paper, we employ the socalled Pre-conceptual Schemas (more) as a graphical language for representing the domain of a software application; also, we implement in the C# language the conversion rules from Pre-conceptual Schemas into UML 2.0 diagrams. C# implementation avoids ambiguity of some of the conversion rules; furthermore, C# implementation permits process automation without the need of experts. Finally, we show the functionality of C# rule-based prototype by means of a case study.

Zapata, Carlos; Cardona, David

2008-06-01

35

Quantitative Analysis of System Based on Extended UML State Diagrams and Probabilistic Model Checking  

Digital Repository Infrastructure Vision for European Research (DRIVER)

class="AbstractChar">If probabilistic model checking is applied in software architecture, function validation and quantitative analysis for Markov process based real-time mode...

Yefei Zhao; Zongyuan Yang; Jinkui Xie; Qiang Liu

36

Mutation-classes of diagrams via infinite graphs  

CERN Document Server

We give a complete description of the cluster-mutation classes of diagrams of Dynkin types \\mathbb{A},\\mathbb{B},\\mathbb{D} and of affine Dynkin types \\mathbb{B}^{(1)},\\mathbb{C}^{(1)},\\mathbb{D}^{(1)} via certain families of diagrams.

Henrich, Thilo

2009-01-01

37

An Event-Based Methodology to Generate Class Diagrams and its Empirical Evaluation  

Directory of Open Access Journals (Sweden)

Full Text Available Problem statement: Event-based systems have importance in many application domains ranging from real time monitoring systems in production, logistics, medical devices and networking to complex event processing in finance and security. The increasing popularity of Event-based systems has opened new challenging issues for them. One such issue is to carry out requirements analysis of event-based systems and build conceptual models. Currently, Object Oriented Analysis (OOA) using Unified Modeling Language (UML) is the most popular requirement analysis approach for which several OOA tools and techniques have been proposed. But none of the techniques and tools to the best of our knowledge, have focused on event-based requirements analysis, rather all are behavior-based approaches. Approach: This study described a requirement analysis approach specifically for event based systems. The proposed approach started from events occurring in the system and derives an importable class diagram specification in XML Metadata Interchange (XMI) format for Argo UML tool. Requirements of the problem domain are captured as events in restricted natural language using the proposed Event Templates in order to reduce the ambiguity. Results: Rules were designed to extract a domain model specification (analysis-level class diagram) from Event Templates. A prototype tool 'EV-ClassGEN' is also developed to provide automation support to extract events from requirements, document the extracted events in Event Templates and implement rules to derive specification for an analysis-level class diagram. The proposed approach is also validated through a controlled experiment by applying it on many cases from different application domains like real time systems, business applications, gaming. Conclusion: Results of the controlled experiment had shown that after studying and applying Event-based approach, student's perception about ease of use and usefulness of OOA technique has significantly improved. Their project reported showed positive feedback about Event-based approach. These results reinforced the evidence that by analyzing events that are likely to happen in a system, one can derive class diagram information from requirements.

Sandeep K. Singh; Sangeeta Sabharwal; J. P. Gupta

2010-01-01

38

Especificación formal en OCL de reglas de consistencia entre los diagramas de clases y casos de uso de UML y el modelo de interfaces/ Formal OCL specification of consistency rules between the UML class and the use case models and the interfaces model  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish En el ciclo de vida del software, durante las fases de definición y análisis, se realiza una especificación de los requisitos. Para ello, es necesario realizar un proceso de captura de las necesidades y expectativas de los interesados, que se traduce posteriormente en un conjunto de modelos que representan tanto el problema como su solución. Por lo general, la mayoría de esos modelos se expresan en el lenguaje de modelado unificado -UML-, que define un conjunto de ar (more) tefactos que permiten especificar los requisitos del software, los cuales deberían guardar consistencia, cuando se trate del mismo modelo. Sin embargo, la consistencia entre diferentes artefactos no se encuentra definida en la especificación de UML y poco se ha trabajado con este tipo de consistencia. En este artículo se propone un método para verificar la consistencia entre el diagrama de clases y el diagrama de casos de uso de UML de una manera formal. Dicho proceso se lleva a cabo evaluando una serie de reglas definidas en el lenguaje de restricciones de objetos -OCL- que se deben cumplir para garantizar que la información brindada por dichos modelos sea consistente. Como se reconoce la participación de los dos diagramas en la elaboración de las interfaces gráficas de usuario -GUI-, se define adicionalmente la consistencia con este artefacto. Abstract in english In a software lifetime, during definition and analysis stages, a specification of requirements is carried out. For such a purpose, it is necessary to get through a process to capture interested persons? needs and expectations, which will later be translated into a set of models representing both the problem and the solution. Most models are frequently expressed by the UML (Unified Modeling Language) which defines a set of devices for specifying software requirements whic (more) h should be consistent with the same model. However, consistency among several devices is not defined in the UML specification and not too much work has been made with this type of consistence. This article proposes a method to verify consistence among UML class diagram and use case diagram in a formal way. Such a process is carried out through an evaluation of several rules defined in the OCL (Object Constraint Language), which should be fulfilled to assure that information provided by such models is consistent. As both diagrams participation is recognized when preparing GUI (Graphic User Interfaces) consistence with this device is additionally defined

Zapata, Carlos Mario; González, Guillermo

2008-01-01

39

Especificación formal en OCL de reglas de consistencia entre los diagramas de clases y casos de uso de UML y el modelo de interfaces Formal OCL specification of consistency rules between the UML class and the use case models and the interfaces model  

Directory of Open Access Journals (Sweden)

Full Text Available En el ciclo de vida del software, durante las fases de definición y análisis, se realiza una especificación de los requisitos. Para ello, es necesario realizar un proceso de captura de las necesidades y expectativas de los interesados, que se traduce posteriormente en un conjunto de modelos que representan tanto el problema como su solución. Por lo general, la mayoría de esos modelos se expresan en el lenguaje de modelado unificado -UML-, que define un conjunto de artefactos que permiten especificar los requisitos del software, los cuales deberían guardar consistencia, cuando se trate del mismo modelo. Sin embargo, la consistencia entre diferentes artefactos no se encuentra definida en la especificación de UML y poco se ha trabajado con este tipo de consistencia. En este artículo se propone un método para verificar la consistencia entre el diagrama de clases y el diagrama de casos de uso de UML de una manera formal. Dicho proceso se lleva a cabo evaluando una serie de reglas definidas en el lenguaje de restricciones de objetos -OCL- que se deben cumplir para garantizar que la información brindada por dichos modelos sea consistente. Como se reconoce la participación de los dos diagramas en la elaboración de las interfaces gráficas de usuario -GUI-, se define adicionalmente la consistencia con este artefacto.In a software lifetime, during definition and analysis stages, a specification of requirements is carried out. For such a purpose, it is necessary to get through a process to capture interested persons’ needs and expectations, which will later be translated into a set of models representing both the problem and the solution. Most models are frequently expressed by the UML (Unified Modeling Language) which defines a set of devices for specifying software requirements which should be consistent with the same model. However, consistency among several devices is not defined in the UML specification and not too much work has been made with this type of consistence. This article proposes a method to verify consistence among UML class diagram and use case diagram in a formal way. Such a process is carried out through an evaluation of several rules defined in the OCL (Object Constraint Language), which should be fulfilled to assure that information provided by such models is consistent. As both diagrams participation is recognized when preparing GUI (Graphic User Interfaces) consistence with this device is additionally defined

Carlos Mario Zapata; Guillermo González

2008-01-01

40

GENERACIÓN DEL DIAGRAMA DE SECUENCIAS DE UML 2.1.1 DESDE ESQUEMAS PRECONCEPTUALES GENERATION OF UML 2.1.1 SEQUENCE DIAGRAM FROM PRE-CONCEPTUAL SCHEMES  

Directory of Open Access Journals (Sweden)

Full Text Available El diagrama de secuencias es un esquema conceptual que permite representar el comportamiento de un sistema, para lo cual emplea la especificación de los objetos que se encuentran en un escenario y la secuencia de mensajes intercambiados entre ellos, con el fin de llevar a cabo una transacción del sistema. Existen diferentes enfoques que buscan la generación automática de modelos conceptuales, como el diagrama de secuencias. Algunos trabajos parten del lenguaje natural, pero generan diagramas diferentes al de secuencias o, si lo hacen igual, dejan de lado elementos como los fragmentos combinados, que describen ciertas condiciones lógicas en el sistema. Otros trabajos parten del código fuente, el cual se suele ubicar en una fase más avanzada del ciclo de vida del software. En este artículo se define un método, basado en reglas heurísticas, que permite identificar los elementos del diagrama de secuencias, incluyendo los fragmentos combinados, tomando como punto de partida los esquemas preconceptuales. Se realiza la implementación de las reglas en la herramienta AToM³ aplicándolas a un caso de estudio.Sequence diagram is a conceptual schema for representing behavior of a system. For performing such a task, it employs the object spec from a scenario and the sequence of messages exchanged among the objects. These elements describe a transaction of the system. Several approaches try the automated generation of conceptual models (like sequence diagram). Some of them use natural language as a starting point, but they are focused on other diagrams. Some others are focused on sequence diagram, but they do not obtain elements like combined fragments describing several logical constraints of the system. Other approaches use source code as a starting point, but source code can be related to an advanced phase of the software development life cycle. In this paper we define a method based on heuristic rules for obtaining automatically the elements of the sequence diagram (including combined fragments) from pre-conceptual schemas. These heuristic rules are implemented in the AToM³ tool and applied in a case study.

Carlos Mario Zapata; Gilma Liliana Garcés

2008-01-01

 
 
 
 
41

GENERACIÓN DEL DIAGRAMA DE SECUENCIAS DE UML 2.1.1 DESDE ESQUEMAS PRECONCEPTUALES/ GENERATION OF UML 2.1.1 SEQUENCE DIAGRAM FROM PRE-CONCEPTUAL SCHEMES  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish El diagrama de secuencias es un esquema conceptual que permite representar el comportamiento de un sistema, para lo cual emplea la especificación de los objetos que se encuentran en un escenario y la secuencia de mensajes intercambiados entre ellos, con el fin de llevar a cabo una transacción del sistema. Existen diferentes enfoques que buscan la generación automática de modelos conceptuales, como el diagrama de secuencias. Algunos trabajos parten del lenguaje natural (more) , pero generan diagramas diferentes al de secuencias o, si lo hacen igual, dejan de lado elementos como los fragmentos combinados, que describen ciertas condiciones lógicas en el sistema. Otros trabajos parten del código fuente, el cual se suele ubicar en una fase más avanzada del ciclo de vida del software. En este artículo se define un método, basado en reglas heurísticas, que permite identificar los elementos del diagrama de secuencias, incluyendo los fragmentos combinados, tomando como punto de partida los esquemas preconceptuales. Se realiza la implementación de las reglas en la herramienta AToM³ aplicándolas a un caso de estudio. Abstract in english Sequence diagram is a conceptual schema for representing behavior of a system. For performing such a task, it employs the object spec from a scenario and the sequence of messages exchanged among the objects. These elements describe a transaction of the system. Several approaches try the automated generation of conceptual models (like sequence diagram). Some of them use natural language as a starting point, but they are focused on other diagrams. Some others are focused on (more) sequence diagram, but they do not obtain elements like combined fragments describing several logical constraints of the system. Other approaches use source code as a starting point, but source code can be related to an advanced phase of the software development life cycle. In this paper we define a method based on heuristic rules for obtaining automatically the elements of the sequence diagram (including combined fragments) from pre-conceptual schemas. These heuristic rules are implemented in the AToM³ tool and applied in a case study.

Zapata, Carlos Mario; Garcés, Gilma Liliana

2008-12-01

42

UML Modelling: The Rational E-Development  

Directory of Open Access Journals (Sweden)

Full Text Available Unified Modeling language (UML) is one of the important modeling languages used for the visual representation of the research problem. In this paper we used Rational Software architecture to design UML diagrams.

Er. Meenu Gupta; Dr. Rajeev Yadav; Minakshi Memoria

2013-01-01

43

RT-UML IN MODELING OF MULTIMEDIA APPLICATIONS  

Directory of Open Access Journals (Sweden)

Full Text Available RT-UML enables a structural and behavioral description of multimedia applications includingtime characteristic, however it does not offer mechanisms of a multimedia objects presentation(arrangement) expression or the time constrains expression between events. Thisfact illustrates RT-UML lack of expressive capabilities, especially in the context of multimediaapplications modeling. The presented in the paper extension of RT-UML illustrateshow multimedia objects arrangement and events synchronizations can be presented, whichmeans new type of diagrams addition to UML (presentation diagrams) and a synchronizedevents set class placing into the time model of RT-UML. Moreover extensions provide an applicationa graphical presentation of synchronized events to sequence and activity diagramsof UML, which enables time constrains of multimedia objects and their activities expression(synchronization of time events, which occur during presentation of multimedia objects).The originality of this approach relies on the extension of RT-UML syntax and on the presentationof an original method of multimedia applications modeling, which can make theproduction process more formalized and thus more precise.

Pawe? Cicho?

2007-01-01

44

Tracing Properties of UML and OCL Models with Maude  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The starting point of this paper is a system described in form of a UML class diagram where system states are characterized by OCL invariants and system transitions are defined by OCL pre- and postconditions. The aim of our approach is to assist the developer in learning about the consequences of th...

Francisco Durán; Martin Gogolla; Manuel Roldán

45

Prototype of Intrusion Detection Model using UML 5.0 and Forward Engineering  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper we are using UML (Unified Modeling Language) which is the blueprint language between the programmers, analysts, and designer’s for easy representation of pictures or diagrammatic notation with some textual data. Here we are using UML 5.0 to show “prototype of the Intrusion Detection Model” and by explaining it by combining various parts by drawing various UML diagrams such as Use cases and Activity diagrams and Class Diagram using which we show forward engineering using the class diagram of the IDM( Intrusion Detection Model). IDM is a device or software that works on detecting malicious activities by unauthorized users that can cause breach to the security policy within a network.

Muthaiyan MADIAJAGAN,; Pragya GARG

2011-01-01

46

Mobile Based Electricity Bill Deposit System through UML  

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Full Text Available The present paper deals with a model design through Unified Modeling Language (UML) for a mobile based elec-tricity bill deposit system. Due to complex life style of people this model is proposed in the form of UML Class, Sequence and Use Case diagrams. For implementation of proposed model, a real case study of Uttar Pradesh Electricity Bill deposit System is considered. By the use of this model, one can display the status of deposited electricity bill on a hand held mobile device system.

Pawan Kumar Chaurasia; Vipin Saxena

2011-01-01

47

Collaborative Learning of UML and SysML  

Directory of Open Access Journals (Sweden)

Full Text Available In the EU-funded project Embed4Auto, we have developed an Integrated Learning Environment (ILE) to support UML/SysML training. The ILE combines independent distance learning with collaborative problem solving and social networking. The learning environment incorporates a set of learning resources on the modeling languages UML2 and SysML, an educational modeling tool supporting class and sequence diagrams and a tool for sharing and discussing solutions to modeling exercises. First evaluations of the ILE have shown promising results.

Sonja Trapp; Ervin Ramollari; Matthias Heintz; Sebastian Weber; Dimitris Dranidis; Jürgen Börstler

2011-01-01

48

UML-DESIGN OF THE INFORMATION ANALYSIS SYSTEM "CURRICULUM" UML-??????????? ????????????-??????????? ??????? “?????????? ????”  

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Full Text Available Relevance of the material, which is presented in papers, is conditioned by the requirements of the state-of-the-art universities in creation of the information-analysis systems of the education management. The main peculiarities of the design of the automated information-analysis management system by using UML are considered. The main diagrams of the information system were created by using the UML. The knowledge domain was analyzed; the functions and tasks of the automated system were defined. The designed diagrams organize the base of the pattern of the structure and connections between the system elements and allow to trace the different aspects of its behavior. Hereafter the designed system might be supplemented by the diagrams to code generation.???????????? ?????????, ??????????? ? ??????, ?????????? ????????? ????????? ???????????? ? ????????? ????????????-??????????? ?????? ?????????? ?????????? ????????. ????????????? ??????????? ???????????? ??????????????? ????????????-??????????? ??????? ?????????? ?????????? ????????????? ???????? ?????????? Rational Rose. ?????????????? ???? UML ?????????? ??????? ???????? ?????? ????????????-??????????? ???????. ????????? ?????? ?????????? ???????, ????????? ??????? ?? ???????? ??????????????? ????????????? ???????, ?? ????????????. ?????????? ???????? ???????? ?????? ??????? ????????? ?? ??’????? ??? ?????????? ??????? ?? ?????????? ??????????????? ????? ??????? ?? ?????????. ? ??????????, ?????????? ??????? ???? ???? ????????? ?????????? ??? ????????? ????.

Valeriy G. Grytsenko; Galyna V. Lutsenko

2011-01-01

49

UML IN BUSINESS ADMINISTRATION  

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Full Text Available The article elaborates weather UML, primarily used in software engineering, can be a useful tool in business modeling and administration. By analyzing the advantages the modeling language has to offer we find that UML is visual and object oriented and that it is useful in expressing structure, interaction and behavior as well. With its help managers and business people can build models and diagrams to help put things into perspective. “Case Study 1” shows UML can be used as an analysis tool in business modeling to help increase the complexity and depth of the event or project that is being developed. “Case Study 2” attempts to prove that UML can also be efficiently used in finding solutions to newly appeared problems in a business environment. Despite the practicality of the Unified Modeling Language there is still some criticism brought to it. Some programmers consider it to be hard to learn and some developers claim that it is too abstract. The article concludes that despite the minor drawbacks; due to its adaptability and complex visual models, it is a very useful tool that adds value to the modeling of business structures and processes.

Daniel Ionita

2010-01-01

50

Automatic Synthesis of Agent Designs in UML  

UK PubMed Central (United Kingdom)

It is anticipated that the UML, perhaps with domain-specificextensions, will increasingly be used to model and analyse agent-basedsystems. Current commercial tools for UML, however, contain a numberof gaps that limit this growth potential. As an example, there is littleor no support for automatic translations between UML notations. Wepresent one such translation --- from sequence diagrams to statecharts--- and discuss how such an algorithm could be used in agent modeling.

Johann Schumann

51

Generación del cuerpo de los métodos a partir de la semántica de las operaciones del diagrama de clases Generating the body of the methods from class diagram operation semantics  

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Full Text Available Para la generación automática de código fuente a partir de los diagramas de UML, las herramientas CASE convencionales sólo generan el encabezado de los métodos, y algunos esfuerzos adicionales generan parcialmente el cuerpo de los métodos, pero empleando elementos que se alejan de los estándares de modelado y, en todo caso, muy cercanos a la elaboración manual de código fuente. Buscando superar esas limitaciones, en este artículo se propone un proceso para generar el cuerpo de los méto-dos del código fuente a partir de las operaciones del diagrama de clases. Para ello se define la “semántica de las operaciones”, que es una manera de ligar las operaciones del diagrama de clases y los métodos implementados en la plataforma de desa-rrollo, tomando como entradas las pre y poscondiciones de las operaciones y el metamodelo de las librerías de la plataforma de desarrollo. Finalmente, el proceso se ejemplifica con un caso de estudio, para el cual fue necesario elaborar una instancia en UML del metamodelo del paquete java.sql.Well-known CASE tools only generate the heading of the methods to automatically generate source code from UML diagrams. Some proposals partially generate the body of the methods; however they use non-standard modeling elements or hand-made source code elements. This paper proposes a process for generating the body of the methods from class diagram operations in an attempt to overcome such constraints. “Semantics of class operations” was thus defined as a way of linking class diagram o-perations to development platform implemented methods. These kinds of semantics use pre- and post-conditions belonging to the operations and the development platform library meta-model. This process is also exemplified by giving a case study. An UML instance of the java.sql package meta-model was created for developing the case study.

Zapata Jaramillo Carlos Mario; Muñetón Andrés Felipe

2008-01-01

52

UML for SOC design  

CERN Multimedia

Offers a tutorial approach to using the UML modeling language in system-on-chip design. This title details the approaches to executable UML, UML translations for FPGA synthesis and SystemC simulation, as well as UML-specific SoC methodologies. It gives insights into the state of the art, and the advances in applying UML to SoC design.

Martin, Grant

2006-01-01

53

Tracing Properties of UML and OCL Models with Maude  

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Full Text Available The starting point of this paper is a system described in form of a UML class diagram where system states are characterized by OCL invariants and system transitions are defined by OCL pre- and postconditions. The aim of our approach is to assist the developer in learning about the consequences of the described system states and transitions and about the formal implications of the properties that are explicitly given. We propose to draw conclusions about the stated constraints by translating the UML and OCL model into the algebraic specification language and system Maude, which is based on rewrite logic. We will concentrate in this paper on employing Maude's capabilities for state search. Maude's state search offers the possibility to describe a start configuration of the system and then explore all configurations reachable by rewriting. The search can be adjusted by formulating requirements for the allowed states and the allowed transitions.

Francisco Durán; Martin Gogolla; Manuel Roldán

2011-01-01

54

Tracing Properties of UML and OCL Models with Maude  

CERN Multimedia

The starting point of this paper is a system described in form of a UML class diagram where system states are characterized by OCL invariants and system transitions are defined by OCL pre- and postconditions. The aim of our approach is to assist the developer in learning about the consequences of the described system states and transitions and about the formal implications of the properties that are explicitly given. We propose to draw conclusions about the stated constraints by translating the UML and OCL model into the algebraic specification language and system Maude, which is based on rewrite logic. We will concentrate in this paper on employing Maude's capabilities for state search. Maude's state search offers the possibility to describe a start configuration of the system and then explore all configurations reachable by rewriting. The search can be adjusted by formulating requirements for the allowed states and the allowed transitions.

Durán, Francisco; Roldán, Manuel; 10.4204/EPTCS.56.6

2011-01-01

55

Mapping DEVS Models onto UML Models  

CERN Multimedia

Discrete event simulation specification (DEVS) is a formalism designed to describe both discrete state and continuous state systems. It is a powerful abstract mathematical notation. However, until recently it lacked proper graphical representation, which made computer simulation of DEVS models a challenging issue. Unified modeling language (UML) is a multipurpose graphical modeling language, a de-facto industrial modeling standard. There exist several commercial and open-source UML editors and code generators. Most of them can save UML models in XML-based XMI files ready for further automated processing. In this paper, we propose a mapping of DEVS models onto UML state and component diagrams. This mapping may lead to an eventual unification of the two modeling formalisms, combining the abstractness of DEVS and expressive power and ``computer friendliness'' of the UML.

Zinoviev, D

2005-01-01

56

UN MÉTODO DE INGENIERÍA INVERSA DE CÓDIGO JAVA HACIA DIAGRAMAS DE SECUENCIAS DE UML 2.0  

Directory of Open Access Journals (Sweden)

Full Text Available La Ingeniería inversa de software aparece como un proceso que ayuda al aseguramiento de la calidad y documentación de aplicaciones con deficiencias en los modelos de análisis y diseño. Además, ayuda en la disminución de costos y tiempos de mantenimiento. En la actualidad existen herramientas CASE y algunas propuestas de investigación que realizan el proceso de ingeniería inversa a diagramas UML, en especial a los diagramas de clases y secuencias. Algunas se encuentran en fases experimentales; otras se enfocan mucho más en el diagrama de clases que en el de secuencias. Un tercer grupo obtiene algunos elementos del diagrama de secuencias, pero no posee muchos de los elementos que hacen parte de la especificación de UML 2.0. En este artículo se propone un método que automatiza la conversión de código JAVA en diagrama de secuencias de UML 2.0, por medio de la aplicación de reglas de transformación que convierten los elementos del código en elementos del diagrama. Se presenta también un ejemplo de aplicación del método con un prototipo que lo emplea, el UNC-Inversor.Software reverse engineering seems to be the process for helping software quality assurance and documentation in applications with low-quality analysis and design models. It also helps for decreasing maintenance cost and time. Currently, some CASE tools and research proposals assist analysts to develop reverse engineering process with UML diagrams as a result (especially class and sequence diagram). Some of them have reached experimental phases. Some others are focused more on class diagram and less on sequence diagram. A third group of CASE tools and proposals obtains sequence diagram, but the resulting diagram lacks some of the elements of the UML 2.0 specification. In this paper, we propose a method for automating the conversion of JAVA code into UML 2.0 sequence diagram, by means of the application of transformation rules for converting code elements to the diagram elements. We also present an example of the method application through a prototype named UNC-Inversor.

Carlos Mario Zapata; Óscar Andrés Ochoa; Camilo Vélez

2008-01-01

57

Diagramas entidad-relación y de clases de UML en el modelado de gobierno electrónico  

Directory of Open Access Journals (Sweden)

Full Text Available El Lenguaje de Modelado Unificado (UML) es considerado hoy en día un método estándar para el desarrollo de sistemas de información. Sin embargo, el grado de fiabilidad y flexibilidad de los portales de gobierno electrónico, requieren el uso de principios básicos y del concurso y la experiencia de viejos estilos y disciplinas del desarrollo de sistemas, que sean independientes de los softwares de aplicación disponibles en el mercado. En ello, el modelo Entidad Relación (ER) es una herramienta fundamental para el modelado de trámites de e-gobierno porque son fácilmente transferidos a los diagramas de clases de UML. De manera que al modelar un sitio Web para gobierno electrónico con UML y ER, el sistema es dotado con diagramas gráficos semi-formales, que permiten el diseño de múltiples vistas basado en un modelado conceptual a partir de las instancias y requerimientos legales de la administración pública. Este trabajo analiza el uso del Modelo Entidad Relación y los diagramas de clase de UML y propone, en forma práctica, las notaciones básicas que se requieren en el desarrollo de un portal de e-gobierno.The Unified Modeling Language (UML) is now considered a standard method for developing information systems. However, the degree of reliability and flexibility of e-government portals, require the use of basic principles of competition and the experience of old styles and disciplines of the development of systems that are independent of application software available on the market. In it, the Entity Relationship Model (ER) is an essential tool for modeling e-government procedures because they are easily transferred to UML class diagrams. So to model a Web site for e-government with UML and ER, the system is equipped with semi-formal graphical charts, which allow the design of multiple views based on a conceptual modeling from the courts or the administration's legal requirements public. This paper analyzes the use of entity-relationship model and UML class diagrams and proposes a practical, basic notations required in the development of e-government portal.

Jesus Alberto Andrade Castro

2012-01-01

58

Applying UML advanced applications  

CERN Multimedia

Unified Modeling Language (UML) is a general-purpose notation language for specifying and visualizing complex software, especially large, object-oriented projects. Object-oriented programming is when a programmer defines not only the data type of a data structure, but also the types of operations/functions that can be applied to the data structure. Applying UML addresses the practical issues faced by users in adopting UML. As the title suggests, it helps the reader in actually applying UML to real life situations, rather than just in learning the language. The book covers in depth detail o

Pooley, Rob

2003-01-01

59

Modeling the UMLS using an OODB.  

Science.gov (United States)

The Unified Medical Language System combines many well established authoritative medical informatics terminologies in one system. Such a resource is very valuable to the healthcare industry. However, the UMLS is very large and complex and poses serious comprehension problems for users and maintenance personnel. Furthermore, the sets of concepts of semantic types are not semantically uniform and thus are difficult to study. We describe a method to represent two components of the UMLS, the Metathesaurus (META) and the Semantic Network, as an OODB. The resulting UMLS OODB schema is deeper and more refined than the Semantic Network. It offers semantically uniform classes, which improves support for comprehension and navigation of META. The UMLS OODB also exposes problems in the semantic type classifications.

Gu, H.; Perl, Y.; Geller, J.; Halper, M.; Liu, L. M.; Cimino, J. J.

1999-01-01

60

Calculation of a class of basic diagrams in quantum field theory  

International Nuclear Information System (INIS)

The two-loop scalar diagram underlying the calculation of the high order Feynman diagrams is calculated. Calculations are carried out using both the Mellin representation for a triangle diagram and the method of functional equations.

1984-01-01

 
 
 
 
61

Propuestas para el Modelamiento de la Calidad del Diagrama de Clases de UML.  

Directory of Open Access Journals (Sweden)

Full Text Available The election of a good conceptual model in the analysis of a system, is definitive for the correct specification of the requirements raised in a domain of application; since, with complete certainty, they will lead to the development or evolution of computer science systems, for greater satisfaction for the end users. The present work is result of the comparative analysis of several used conceptual models in the engineering of software, more specifically the calls structural models, as they are: Entity-Relation model extended by Richard Barker, the Model of Semantic Objects of Hammer and McLeod, the Diagram of Configuration of Classes of OO-Method and the Diagram of Classes of UML. In order to determine kindness of each one of these models, the following criteria of quality were used: semantic wealth, simplicity, rigor and sufficiency. In the comparative analysis, first the conceptswere identified that allow to represent each model and, soon, by means of examples was analyzed the convenience of the inclusion of each concept. The comparison of the models allowed to discover what they contribute and display a series of proposals for the improvement of the quality of the Diagram of Classes of UML.

Claudia Jiménez

2004-01-01

62

Distributed Graphical User Interfaces to Class Diagram: Reverse Engineering Approach using Pattern Recognition  

Directory of Open Access Journals (Sweden)

Full Text Available The graphical user interfaces of software programs are used by researchers in the soft-ware engineeringfield to measure functionality, usability, durability, accessibility, and performance. This paper describes areverse engineering approach to transformthe cap-tured images of the distributed GUIs into classdiagram. The processed distributed GUIs come from different and separate client computers. From thedistributed GUIs, the inter-faces are captured as images, attributes and functions are extracted andprocessed through pattern recognitions mechanism to be stored into several temporary tablescorresponding to each client’s graphical user interface. These tables will be analyzed and processed intoone integrated normalized table eliminating any attribute redundancies. Further, the normalized the oneintegrated table is to create a class diagram

Akram Abdel Qader; Khaled Musa

2013-01-01

63

QVT transformation by modelling - From UML Model to MD Model  

Directory of Open Access Journals (Sweden)

Full Text Available To provide a complete analysis of the organization, its business and its needs, it is necessary for leaders to have data that help decision making. Data warehouses are designed to meet such needs; they are an analysis and data management technology. This article describes an MDA (Model Driven Architecture) process that we have used to automatically generate the multidimensional schema of data warehouse. This process uses model transformation using several standards such as Unified Modeling Language, Meta-Object Facility, Query View Transformation, Object Constraint Language, ... From the UML model, especially the class diagram, a multidimensional model is generated as an XML file, the transformation is carried out by the QVT (Query View Transformation) language and the OCL (Object Constraint Language) Language. To validate our approach a case study is presented at the end of this work

I.Arrassen; A.Meziane; R.Sbai; M.Erramdani

2011-01-01

64

Verification-Driven Slicing of UML/OCL Models  

DEFF Research Database (Denmark)

Model defects are a significant concern in the Model-Driven Development (MDD) paradigm, as model transformations and code generation may propagate errors to other notations where they are harder to detect and trace. Formal verification techniques can check the correctness of a model, but their high computational complexity can limit their scalability. In this paper, we consider a specific static model (UML class diagrams annotated with unrestricted OCL constraints) and a specific property to verify (satisfiability, i.e., “is it possible to create objects without violating any constraint?”). Current approaches to this problem have an exponential worst-case runtime. We propose a technique to improve their scalability by partitioning the original model into submodels (slices) which can be verified independently and where irrelevant information has been abstracted. The definition of the slicing procedure ensures that the property under verification is preserved after partitioning.

Shaikh, Asadullah; Clarisó Viladrosa, Robert

2010-01-01

65

Automatic Synthesis of Agent Designs in UML  

UK PubMed Central (United Kingdom)

this paper, wehave presented an algorithm for automatically generatingUML statecharts from a set of sequence diagrams. For the development oflarge-scale agent-based systems, sequence diagrams can be a valuable meansto describe inter-agent communication. We extend sequence diagrams withadditional language constructs to enable generalizations and augment themwith communication pre- and post-conditions in OCL. This enables us toautomatically detect and report con#icts between di#erent sequence diagramsand inconsistencies with respect to the domain theory. These annotations arefurthermore used in our algorithm to correctly identify similar states and tomerge a number of sequence diagrams into a single statechart. In order tomake the algorithm practical, weintroduce hierarchyinto the statechart.

Johann Schumann

66

Automatic Synthesis of Agent Designs in UML  

UK PubMed Central (United Kingdom)

this paper, we have presented an algorithm for automatically generatingUML statecharts from a set of sequence diagrams. For the development oflarge-scale agent-based systems, sequence diagrams can be a valuable meansto describe inter-agent communication. We extend sequence diagrams withadditional language constructs to enable generalizations and augment themwith communication pre- and post-conditions in OCL. This enables us toautomatically detect and report conflicts between different sequence diagramsand inconsistencies with respect to the domain theory. These annotations arefurthermore used in our algorithm to correctly identify similar states and tomerge a number of sequence diagrams into a single statechart. In order tomake the algorithm practical, we introduce hierarchy into the statechart.

Johann Schumann

67

Automatic Synthesis of Agent Designs in UML  

UK PubMed Central (United Kingdom)

IntroductionSuccessful development of large-scale agent-based software requires modelingmethods and tools that support the entire development lifecycle. Agentbasedsystems are inherently complex and exhibit many similarities to objectorientedsystems [Ode00]. For these reasons, we agree with the views expressedin [OVB00] that UML (Unified Modeling Language), along withsome agent-specific extensions (called AUML), can be very valuable for thedevelopment of agent software.The focus of our own research is in bridging the current gap in UMLbetween requirements, expressed as scenarios, and initial design specifications.The use of scenarios is widespread in agent software. A tool capableof automatically generating design approximations could be used to studyinteractions among agents or to develop agent protocols. We are developingan algorithm that will synthesize a statechart specification from a collectionof UML sequence diagrams1. This algorithm pr

Johann Schumann; Jon Whittle

68

DATA INFORMATION SYSTEM TO PROMOTE THE ORGANIZATION DATA OF COLLECTIONS – MODELING CONSIDERATIONS BY THE UNIFIED MODELIGN LANGUAGE (UML)  

Directory of Open Access Journals (Sweden)

Full Text Available It can be argued that technological developments (e.g., measuring instruments like software,satellite and computers, as well as, the cheapening of storage media) allow organizations toproduce and acquire a great amount of data in a short time. Due to the data volume, researchorganizations become potentially vulnerable to the information explosion impacts. An adoptedsolution is the use of information system tools to assist data documentation, retrieval andanalysis. In the scientific scope, these tools are developed to store different metadata (data aboutdata) patterns. During the development process of these tools, the adoption of standards such asthe Unified Modeling Language (UML) stands out, whose diagrams assist the different scopes ofsoftware modeling. The objective of this study is to present an information system tool thatassists organizations in the data documentation through the use of metadata and that highlightsthe software modeling process, through the UML. The Standard for Digital Geospatial Metadatawill be approached, widely used to the dataset cataloging by scientific organizations around theworld, and the dynamic and static UML diagrams like use cases, sequence and classes. Thedevelopment of the information system tools can be a way to promote the scientific dataorganization and dissemination. However, the modeling process requires special attention duringthe development of interfaces that will stimulate the use of the information system tools can be a way to promote the scientific dataorganization and dissemination. However, the modeling process requires special attention duringthe development of interfaces that will stimulate the use of the information system tools.

Eduardo Batista de Moraes Barbosa; Galeno José de Sena

2011-01-01

69

Comparison of Class Inheritance and Interface Usage in Object Oriented Programming through Complexity Measures  

Directory of Open Access Journals (Sweden)

Full Text Available It is widely acknowledged that in software engineering, the usage of metrics at the initial phases of theobject oriented software can help designers to make better decisions. The quality of class diagrams couldbe a major determinant for the quality of the software product that is finally delivered. Quantitativemeasurements are useful to assess class diagram quality. Following this innovative thinking, two UMLclass diagrams are taken to measure the complexity and size. A set of metrics of complexity measures areused to measure the class diagrams. Seven known complexity measures are evaluated and compared forinheritance and interface usage in object oriented programming. Two UML class diagrams areintroduced with possible interfaces and measured the complexity metrics and a comparison has beenmade between the class inheritance and class interface usage through complexity measurements.

V. Krishnapriya; K. Ramar

2010-01-01

70

Learning UML 2.0  

CERN Document Server

Engaging and accessible, this book shows you how to use UML to craft and communicate your project's design. Russ Miles and Kim Hamilton have written a pragmatic introduction to UML based on hard-earned practice, not theory. Regardless of the software process or methodology you use, this book is the one source you need to get up and running with UML 2.0

Miles, Russ

2006-01-01

71

Model-Driven transformation with approach by modeling-From UML to N-tiers Web Model  

Directory of Open Access Journals (Sweden)

Full Text Available Today, the N-tiers applications have become the norm for building enterprise software. In this paper we are going to present a model-driven approach to the development of N-tiers web applications based on the UML class diagram. The transformation language is the MOF 2.0 QVT (Meta-Object Facility 2.0 Query-View-Transformation) standard which defines the meta-model for the development of model transformation. The transformation rules defined in this paper can generate, from the class diagram, an XML file containing the layers of N-tiers web application respecting a MVC2 (Model-View-Controller), DI (Dependency Injection) and DAO (Data Access Object) patterns. This file can be used to generate the end-to-end necessary code of a web application.

Redouane Esbai; Mohammed Erramdani; Samir Mbarki; Ibtissam Arrassen; Abdelouafi Meziane; Mimoun Moussaoui

2011-01-01

72

Test Case Generation For Concurrent Object-Oriented Systems Using Combinational Uml Models  

Directory of Open Access Journals (Sweden)

Full Text Available Software testing is an important phase of software development to ensure the quality and reliability of the software. Due to some limitations of code based testing method, the researcher has been taken a new method to work upon UML model based testing. It is found that different UML model is having different coverage and capable of detecting different kinds of faults. Here we have taken combinational UML models to have better coverage and fault detection capability. Testing concurrent system is difficult task because due to concurrent interaction among the threads and the system results in test case explosion. In this paper we have presented an approach of generating test cases for concurrent systems using combinational UML models i.e. sequence diagram and activity diagram .Then a Sequence-Activity Graph (SAG) is constructed from these two diagrams. Then that graph is traversed to generate test cases which are able to minimize test case explosion.

Swagatika Dalai, Arup Abhinna Acharya, Durga Prasad Mohapatra

2012-01-01

73

Una Novedosa Herramienta CASE basada en Esquemas Preconceptuales para la Obtención Automática de Diagramas UML.  

Directory of Open Access Journals (Sweden)

Full Text Available Assistance is provided, in software development process, to Analysts in drawing UML diagrams and others by means of CASE tools. However, the task of the Stakeholder discourse understanding, a previous process in diagram drawing, is not supported by traditional CASE tools. In order to complete this task, Natural Language Processing has proposed a new kind of CASE tools, including both natural language interpretation and UML diagrams generation. We introduce, in this paper, UNC–Diagrammer, a novel CASE tool for graphically representing the Stakeholder discourse by means of Preconceptual Schemas. We also show that UNC-Diagrammer is capable of automatically transforming Pre-conceptual Schemas into three UML 2.0 diagrams. We finally demonstrate the use of UNC–Diagrammer through an example.

Carlos Zapata; Alexander Gelbukh; Fernando Arango

2007-01-01

74

The UMLS Knowledge Source server.  

UK PubMed Central (United Kingdom)

The UMLS Knowledge Source server is an evolving tool for accessing information stored in the UMLS Knowledge Sources. The system architecture is based on the client-server paradigm wherein remote site users send their requests to a centrally managed server at the U.S. National Library of Medicine. The client programs can run on platforms supporting the TCP/IP communication protocol. Access to the system is provided through a command-line interface and through an Application Programming Interface.

McCray AT; Razi A

1995-01-01

75

UML 2 Certification Guide Fundamental & Intermediate Exams  

CERN Multimedia

The popular Unified Modeling Language (UML) is both a language and notation developed by the Object Management Group (OMG) used to design and create specifications for software systems. With the recent release of version 2.0 UML, the OMG has started the OMG-Certified UML Professional Program to provide an objective measure of UML knowledge. As a certified UML professional a developer has an important credential to present to employers and clients. Certification also benefits companies looking for skilled UML practitioners by giving them a basis for making hiring and promotion decisions.UML 2 C

Weilkiens, Tim

2006-01-01

76

Risk Analysis Model Using UML and MADS Model  

Directory of Open Access Journals (Sweden)

Full Text Available The purpose of this paper is to propose a model of risk analysis which combines two tools belonging to a different context. These both tools are MADS (Model of Analysis of Dysfunctional Systems) and UML (Unified Model Language). The proposed method aims to integrate UML language, especially the collaboration diagram, in the MADS model. We represent the danger source system of MADS model with the collaboration diagram in order to define and model the scenarios of risk. The application of this method is illustrated with an example of a storage unit of chemicals. On the one hand, the proposed model provides a comprehensive view that facilitates the understanding of the organization of an industrial system, and on the another hand, it leads to more effective analysis of risks taking into account the interactions between the system components.

Hafida Bouloiz; Emmanuel Garbolino; Mohamed Tkiouat

2011-01-01

77

An Empirical Study to Specify Requirements Using UML and Z  

Directory of Open Access Journals (Sweden)

Full Text Available This article presents the results of an empirical study which used some UML diagrams –semi-formal modeling– and Z language –formal modeling– to do a specification of system requirements. The results showed the benefits of formal modeling to improve the quality of specification requirements of an information system. In the experiment also was perceived the need for a clear correspondence between the approaches modeling used. This correspondence was established during the experiment, allowing the correct joint specification.

Ana María Potosí; Teresita Cordero

2011-01-01

78

Using EUREQA for End-User UML Model Development through Design Patterns  

Directory of Open Access Journals (Sweden)

Full Text Available This work presents the EUREQA approach for end-user development. The purpose of the tool is to narrow the cognitive gap between the end-user developer's mental model and the software model. The tool uses design patterns as building blocks allowing end-users to create UML class diagram models that capture their domain knowledge. The EUREQA tool hides from view the complexity of code thereby reducing the cognitive load on end-user developers. EUREQA makes non-functional quality issues a first-class concern allowing end-user developers to consider both functional and non-functional aspects of design alternatives. The tool uses visualization techniques to aid in non-functional quality assesment. The purpose of this paper is to evaluate and assess the opportunities and challenges of EUREQA. A qualitative, pilot evaluation of EUREQA shows that the visualization techniques work well, whereas there are issues with the abstraction gap between the visualization and class diagram.

Paul Gordon Austrem

2011-01-01

79

UML Profiles for Design Decisions and Non-Functional Requirements  

Energy Technology Data Exchange (ETDEWEB)

A software architecture is composed of a collection of design decisions. Each design decision helps or hinders certain Non-Functional Requirements (NFR). Current software architecture views focus on expressing components and connectors in the system. Design decisions and their relationships with non-functional requirements are often captured in separate design documentation, not explicitly expressed in any views. This disassociation makes architecture comprehension and architecture evolution harder. In this paper, we propose a UML profile for modeling design decisions and an associated UML profile for modeling non-functional requirements in a generic way. The two UML profiles treat design decisions and nonfunctional requirements as first-class elements. Modeled design decisions always refer to existing architectural elements and thus maintain traceability between the two. We provide a mechanism for checking consistency over this traceability. An exemplar is given as

Zhu, Liming; Gorton, Ian

2007-06-30

80

Using OCL in Executable UML  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Executable UML allows precisely describing the software system at a higher level of abstraction. The executable models can be translated to a less abstract program-ming language completely or executed directly. Object Constraint Language (OCL), as a formal specification language, is a standard publi...

Jiang, Ke; Zhang, Lei; Miyake, Shigeru

 
 
 
 
81

Using UML as a Front-end for StreamIt Programs Verification and Generation  

Directory of Open Access Journals (Sweden)

Full Text Available UML provides all benefits from the objectoriented paradigm, such as encapsulation and reusability. It has been proven very successful and is widely used in software designs while StreamIt is targeted to support stream processing domain for multi-core architectures. However, programming in StreamIt can be error-prone and does not adequately cope with early validated multimedia systems. In addition, software engineers usually prefer to employ UML, due to its higher abstraction level and visual nature. This paper proposes the mapping of the application model from UML to StreamIt. Our flow starts by establishing the application model using UML structure diagrams. The second step consists in formal verification of some desirable and/or undesirable properties such as deadlock using the rewriting logic based Maude language before StreamIt code generation.

Fateh Boutekkouk; Mohamed Benmohammed

2010-01-01

82

Performance Evaluation of UML2-Modeled Embedded Streaming Applications with System-Level Simulation  

Directory of Open Access Journals (Sweden)

Full Text Available This article presents an efficient method to capture abstract performance model of streaming data real-time embedded systems (RTESs). Unified Modeling Language version 2 (UML2) is used for the performance modeling and as a front-end for a tool framework that enables simulation-based performance evaluation and design-space exploration. The adopted application meta-model in UML resembles the Kahn Process Network (KPN) model and it is targeted at simulation-based performance evaluation. The application workload modeling is done using UML2 activity diagrams, and platform is described with structural UML2 diagrams and model elements. These concepts are defined using a subset of the profile for Modeling and Analysis of Realtime and Embedded (MARTE) systems from OMG and custom stereotype extensions. The goal of the performance modeling and simulation is to achieve early estimates on task response times, processing element, memory, and on-chip network utilizations, among other information that is used for design-space exploration. As a case study, a video codec application on multiple processors is modeled, evaluated, and explored. In comparison to related work, this is the first proposal that defines transformation between UML activity diagrams and streaming data application workload meta models and successfully adopts it for RTES performance evaluation.

Arpinen Tero; Salminen Erno; Hämäläinen TimoD; Hännikäinen Marko

2009-01-01

83

UML in business process modeling  

Directory of Open Access Journals (Sweden)

Full Text Available Selection and proper application of business process modeling methods and techniques have a significant impact on organizational improvement capabilities as well as proper understanding of functionality of information systems that shall support activity of the organization. A number of business process modeling notations were popularized in practice in recent decades. Most significant of the notations include Business Process Modeling Notation (OMG BPMN) and several Unified Modeling Language (OMG UML) extensions. In this paper, the assessment whether one of the most flexible and strictly standardized contemporary business process modeling notations, i.e. Rational UML Profile for Business Modeling, enable business analysts to prepare business models that are all-embracing and understandable by all the stakeholders. After the introduction, methodology of research is discussed. Section 2 presents selected case study results. The paper is concluded with a summary.

Bartosz Marcinkowski

2013-01-01

84

A UML profile for the OBO relation ontology  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Ontologies have increasingly been used in the biomedical domain, which has prompted the emergence of different initiatives to facilitate their development and integration. The Open Biological and Biomedical Ontologies (OBO) Foundry consortium provides a repository of life-science ontologies, which are developed according to a set of shared principles. This consortium has developed an ontology called OBO Relation Ontology aiming at standardizing the different types of biological entity classes and associated relationships. Since ontologies are primarily intended to be used by humans, the use of graphical notations for ontology development facilitates the capture, comprehension and communication of knowledge between its users. However, OBO Foundry ontologies are captured and represented basically using text-based notations. The Unified Modeling Language (UML) provides a standard and widely-used graphical notation for modeling computer systems. UML provides a well-defined set of modeling elements, which can be extended using a built-in extension mechanism named Profile. Thus, this work aims at developing a UML profile for the OBO Relation Ontology to provide a domain-specific set of modeling elements that can be used to create standard UML-based ontologies in the biomedical domain. Results We have studied the OBO Relation Ontology, the UML metamodel and the UML profiling mechanism. Based on these studies, we have proposed an extension to the UML metamodel in conformance with the OBO Relation Ontology and we have defined a profile that implements the extended metamodel. Finally, we have applied the proposed UML profile in the development of a number of fragments from different ontologies. Particularly, we have considered the Gene Ontology (GO), the PRotein Ontology (PRO) and the Xenopus Anatomy and Development Ontology (XAO). Conclusions The use of an established and well-known graphical language in the development of biomedical ontologies provides a more intuitive form of capturing and representing knowledge than using only text-based notations. The use of the profile requires the domain expert to reason about the underlying semantics of the concepts and relationships being modeled, which helps preventing the introduction of inconsistencies in an ontology under development and facilitates the identification and correction of errors in an already defined ontology.

Guardia Gabriela DA; Vêncio Ricardo ZN; de Farias Cléver RG

2012-01-01

85

A UML profile for the OBO relation ontology.  

UK PubMed Central (United Kingdom)

BACKGROUND: Ontologies have increasingly been used in the biomedical domain, which has prompted the emergence of different initiatives to facilitate their development and integration. The Open Biological and Biomedical Ontologies (OBO) Foundry consortium provides a repository of life-science ontologies, which are developed according to a set of shared principles. This consortium has developed an ontology called OBO Relation Ontology aiming at standardizing the different types of biological entity classes and associated relationships. Since ontologies are primarily intended to be used by humans, the use of graphical notations for ontology development facilitates the capture, comprehension and communication of knowledge between its users. However, OBO Foundry ontologies are captured and represented basically using text-based notations. The Unified Modeling Language (UML) provides a standard and widely-used graphical notation for modeling computer systems. UML provides a well-defined set of modeling elements, which can be extended using a built-in extension mechanism named Profile. Thus, this work aims at developing a UML profile for the OBO Relation Ontology to provide a domain-specific set of modeling elements that can be used to create standard UML-based ontologies in the biomedical domain.

Guardia GD; Vêncio RZ; de Farias CR

2012-01-01

86

Data information system to promote the organization data of collections - modeling considerations by the Unified Modelign Language (UML)  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese Pode-se afirmar que a evolução tecnológica (desenvolvimento de novos instrumentos de medição como, softwares, satélites e computadores, bem como, o barateamento das mídias de armazenamento) permite às Organizações produzirem e adquirirem grande quantidade de dados em curto espaço de tempo. Devido ao volume de dados, Organizações de pesquisa se tornam potencialmente vulneráveis aos impactos da explosão de informações. Uma solução adotada por algumas Orga (more) nizações é a utilização de ferramentas de sistemas de informação para auxiliar na documentação, recuperação e análise dos dados. No âmbito científico, essas ferramentas são desenvolvidas para armazenar diferentes padrões de metadados (dados sobre dados). Durante o processo de desenvolvimento destas ferramentas, destaca-se a adoção de padrões como a Linguagem Unificada de Modelagem (UML, do Inglês Unified Modeling Language), cujos diagramas auxiliam na modelagem de diferentes aspectos do software. O objetivo deste estudo é apresentar uma ferramenta de sistemas de informação para auxiliar na documentação dos dados das Organizações por meio de metadados e destacar o processo de modelagem de software, por meio da UML. Será abordado o Padrão de Metadados Digitais Geoespaciais, amplamente utilizado na catalogação de dados por Organizações científicas de todo mundo, e os diagramas dinâmicos e estáticos da UML como casos de uso, sequências e classes. O desenvolvimento das ferramentas de sistemas de informação pode ser uma forma de promover a organização e a divulgação de dados científicos. No entanto, o processo de modelagem requer especial atenção para o desenvolvimento de interfaces que estimularão o uso das ferramentas de sistemas de informação. Abstract in english It can be argued that technological developments (e.g., measuring instruments like software, satellite and computers, as well as, the cheapening of storage media) allow organizations to produce and acquire a great amount of data in a short time. Due to the data volume, research organizations become potentially vulnerable to the information explosion impacts. An adopted solution is the use of information system tools to assist data documentation, retrieval and analysis. In (more) the scientific scope, these tools are developed to store different metadata (data about data) patterns. During the development process of these tools, the adoption of standards such as the Unified Modeling Language (UML) stands out, whose diagrams assist the different scopes of software modeling. The objective of this study is to present an information system tool that assists organizations in the data documentation through the use of metadata and that highlights the software modeling process, through the UML. The Standard for Digital Geospatial Metadata will be approached, widely used to the dataset cataloging by scientific organizations around the world, and the dynamic and static UML diagrams like use cases, sequence and classes. The development of the information system tools can be a way to promote the scientific data organization and dissemination. However, the modeling process requires special attention during the development of interfaces that will stimulate the use of the information system tools.

Barbosa, Eduardo Batista de Moraes; Sena, Galeno José de

2011-01-01

87

On the Use of Graph Transformation in the Modeling and Verification of Dynamic Behavior in UML Models  

Directory of Open Access Journals (Sweden)

Full Text Available The use of the UML specification language for modelling dynamic behaviors of systems is very widespread. UML Statecharts and Collaboration diagrams are widely used to model dynamic behaviors of systems. However, the lack of firm semantics for the UML modeling notations makes the detection of behavioral inconsistencies difficult in the initial phases of development. The use of formal methods makes such error detection possible but the learning cost is high. Integrating UML with a suitable formal notation is a promising approach that makes UML more precise and amenable to rigorous analysis. In this paper, we present the benefits of a similar approach that is the integration of UML Statechart and Collaboration diagrams and Colored Petri Nets models. The result is an automated approach and a tool environment that formally transforms dynamic behaviors of systems expressed using UML models into their equivalent Colored Petri Nets models for analysis purposes. To make the analysis easier, the obtained models are used to generate automatically their equivalent description in the input language of the INA Petri net analyzer. The approach is based on Graph Transformation and the Meta-Modeling tool ATOM3 is used. The approach is illustrated through an example.

Elhillali Kerkouche; Allaoua Chaoui; El Bay Bourennane; Ouassila Labbani

2010-01-01

88

Modeling Value Chain Analysis of Distance Education using UML  

Science.gov (United States)

Distance education continues to grow as a methodology for the delivery of course content in higher education in India as well as abroad. To manage this growing demand and to provide certain flexibility, there must be certain strategic planning about the use of ICT tools. Value chain analysis is a framework for breaking down the sequence of business functions into a set of activities through which utility could be added to service. Thus it can help to determine the competitive advantage that is enjoyed by an institute. To implement these business functions certain visual representation is required. UML allows for this representation by using a set of structural and behavioral diagrams. In this paper, the first section defines a framework for value chain analysis and highlights its advantages. The second section gives a brief overview of related work in this field. The third section gives a brief discussion on distance education. The fourth section very briefly introduces UML. The fifth section models value chain of distance education using UML. Finally we discuss the limitations and the problems posed in this domain.

Acharya, Anal; Mukherjee, Soumen

2010-10-01

89

QuantUM: Quantitative Safety Analysis of UML Models  

Directory of Open Access Journals (Sweden)

Full Text Available When developing a safety-critical system it is essential to obtain an assessment of different design alternatives. In particular, an early safety assessment of the architectural design of a system is desirable. In spite of the plethora of available formal quantitative analysis methods it is still difficult for software and system architects to integrate these techniques into their every day work. This is mainly due to the lack of methods that can be directly applied to architecture level models, for instance given as UML diagrams. Also, it is necessary that the description methods used do not require a profound knowledge of formal methods. Our approach bridges this gap and improves the integration of quantitative safety analysis methods into the development process. All inputs of the analysis are specified at the level of a UML model. This model is then automatically translated into the analysis model, and the results of the analysis are consequently represented on the level of the UML model. Thus the analysis model and the formal methods used during the analysis are hidden from the user. We illustrate the usefulness of our approach using an industrial strength case study.

Florian Leitner-Fischer; Stefan Leue

2011-01-01

90

QuantUM: Quantitative Safety Analysis of UML Models  

CERN Multimedia

When developing a safety-critical system it is essential to obtain an assessment of different design alternatives. In particular, an early safety assessment of the architectural design of a system is desirable. In spite of the plethora of available formal quantitative analysis methods it is still difficult for software and system architects to integrate these techniques into their every day work. This is mainly due to the lack of methods that can be directly applied to architecture level models, for instance given as UML diagrams. Also, it is necessary that the description methods used do not require a profound knowledge of formal methods. Our approach bridges this gap and improves the integration of quantitative safety analysis methods into the development process. All inputs of the analysis are specified at the level of a UML model. This model is then automatically translated into the analysis model, and the results of the analysis are consequently represented on the level of the UML model. Thus the analysi...

Leitner-Fischer, Florian; 10.4204/EPTCS.57.2

2011-01-01

91

Software Architecture modeling framework using UML  

Directory of Open Access Journals (Sweden)

Full Text Available The software architecture’s are built using some specific languages while developing a project. Architecture design languages are used in research and industrial projects that are used represented using Unified Modeling Languages. However UML is not a completely qualified Architecture design language. But it has the ability to use as a substitute for all other languages that has been used earlier. UML can be used for creating Architectural viewpoint, this paper shows how UML can be extended for creating Software Architectures with architectural abstractions. The example that is used here for extended framework of UML is the CTScan device.

R. Aroul canessane; Dr. S. Srinivasan

2013-01-01

92

On the evaluation of a certain class of Feynman diagrams in x-space: Sunrise-type topologies at any loop order  

International Nuclear Information System (INIS)

We review recently developed new powerful techniques to compute a class of Feynman diagrams at any loop order, known as sunrise-type diagrams. These sunrise-type topologies have many important applications in many different fields of physics and we believe it to be timely to discuss their evaluation from a unified point of view. The method is based on the analysis of the diagrams directly in configuration space which, in the case of the sunrise-type diagrams and diagrams related to them, leads to enormous simplifications as compared to the traditional evaluation of loops in momentum space. We present explicit formulae for their analytical evaluation for arbitrary mass configurations and arbitrary dimensions at any loop order. We discuss several limiting cases in their kinematical regimes which are e.g. relevant for applications in HQET and NRQCD. We completely solve the problem of renormalization using simple formulae for the counterterms within dimensional regularization. An important application is the computation of the multi-particle phase space in D-dimensional space-time which we discuss. We present some examples of their numerical evaluation in the general case of D-dimensional space-time as well as in integer dimensions D = D0 for different values of dimensions including the most important practical cases D0 = 2, 3, 4. Substantial simplifications occur for odd integer space-time dimensions where the final results can be expressed in closed form through elementary functions. We discuss the use of recurrence relations naturally emerging in configuration space for the calculation of special series of integrals of the sunrise topology. We finally report on results for the computation of an extension of the basic sunrise topology, namely the spectacle topology and the topology where an irreducible loop is added.

2007-01-01

93

Conformance testing from UML specifications. Experience Report  

Digital Repository Infrastructure Vision for European Research (DRIVER)

UMLAUT is a framework for building tools dedicated to the manipulation of models described using the Unified Modeling Language (UML). TGV is a tool for the generation of conformance test suites for protocols. Both tools are connected so that it is possible to specify an application in UML and derive...

Du Bousquet, Lydie; Martin, Hugues; Jézéquel, Jean-Marc

94

The UMLS coverage of clinical radiology.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The informational content of clinical radiology reports was examined to determine the coverage of the Unified Medical Language System (UMLS) in relation to the terminology used by physicians in the Radiology Department of Columbia Presbyterian Medical Center (CPMC). The UMLS semantic network contain...

Friedman, C.

95

Uml Alanysis For Quality Assurance Management System for Higher Education  

Directory of Open Access Journals (Sweden)

Full Text Available One of the most important concerns of the current institutions of higher education is the management process to ensure quality. The most important problems facing these institutions is the quality assurance evaluation process. One of the best ways to overcome this problem building a system based on a computer to manage that process. We will define this system as "a Quality Assurance Management system For Higher Education (QAMS)". During this paper we will explain our vision and analysis to build such a system. During the system construction we must identify the main modules for the system and the relationships between them. Our QAMS will be constructed to enable the quality evaluator to evaluate the institution quality and generate the final quality report automatically without additional efforts. The main purpose from this paper is to explain our QAMS components. This view will be illustrated by using the UML language diagrams as use-case diagram, data flow diagram, flowchart, and activity diagram.

Mahmud Kandel; Ahmed. E. Hassan; Aziza. S. Asem,; Mohamed. E. Ibrahim

2010-01-01

96

Stereo Diagrams  

Science.gov (United States)

This exercise is an introduction to stereo diagrams. Students draw stereo diagrams for various models, determine the point group and crystal system of certain crystal shapes, and determine which block models match given stereo diagrams.

Perkins, Dexter

97

Modeliranje nepremi?ninskih transakcij in UML : Modeling Real Estate Transactions with UML  

Directory of Open Access Journals (Sweden)

Full Text Available Understanding spatial data concepts is crucial in order to define and apply spatial data models. The modeling process is the know-how on what steps to carry out during analysis and design of formal static and dynamic spatial models. The development of specific methodology for modeling real estate transaction cases was the primary objective. The methods used originate from the system-engineering domain and are only partly described because of the scanty space available. The presented approach was applied for modeling of different real estate transactions. The result is a set of related UML (Unified Modeling Language) diagrams and formal descriptions of selected transaction use cases. In this paper only the simple subdivision of a parcel is presented. This short transaction example guides us through the Slovenian settings and circumstances. It was selected in order to illustrate the modeling methodology and its results as such. The main focus is on the modeling approach and not on the complexity of some real estate transaction cases.

Radoš Šumrada

2006-01-01

98

A UML-based Instructional Modeling Language  

Directory of Open Access Journals (Sweden)

Full Text Available This article presents our results about an exploratory research work on the potential add-ons of the UML formalism for the design and implementation of distant learning situations. Our work focus on the specific Problem-Based Learning situations but could be suitable for other learning theories and approaches. Then we propose the CPM language based on a UML profile specialization in order to describe instructional design models upstream formal ones specified with standards like IMS-LD. Our language is implemented within an existent UML-CASE tool which has been customized in order to experiment end-users (instructional designers) facilities for the creation/support/maintenance of CPM models. The language has been tested on a complete case-study. We also briefly present and discuss additional works extending our contribution beyond the design stage. From these results, we stress the potentials of a Model-Driven instructional approach.

Pierre LAFORCADE; Thierry NODENOT; Christian SALLABERRY

2005-01-01

99

Modelling Browsing Semantics in Hypertexts Using UML  

UK PubMed Central (United Kingdom)

Navigation is one of the basic characteristics of a hypertext. This feature enablesbrowsing through different paths within the hypertext document. On the other handa problem of being lost in hyperspace can arise. One solution to this problem is improvinga hypertext structure. This can be achieved by creating a model of hypertext dynamicbehaviour. This paper presents our approach to modelling navigational structure ofhypertext using the Unified Modelling Language (UML). Our goal is to define a unifiedframework for modelling hypertext browsing semantics. We specify semantics for diagramscapable of interaction and navigation modelling. An example of a university course specificationis given to illustrate the use of the proposed extensions to UML techniques.

Peter Dolog; Mria Bielikov

100

Towards Automatic Transformation from UML Model to FSM Model for Web Applications  

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Full Text Available The need for automatic testing of large-scale web applications suggests the use of model-based testing technology. Among various modeling languages, UML is widely spread and used for its simplicity, understandability and ease of use. But rigorous analysis for UML model is difficult due to its lack of precise semantics. On the other hand, as a formal notation, FSM provides an avenue for automatic generation of test cases, but the requirement for mathematical basis makes itself academic inventions divorced from real applications. This paper proposes an approach to transforming UML model to FSM model, taking advantage of both languages. As our work focuses on the transformation of UML state diagrams to FSM models, a specific transformation mechanism is presented, which deals with different elements with different mapping rules. To illustrate the mechanism we proposed, an example of a web application for software download is presented. Finally, we give a method for implementation of the mechanism and a tool prototype to support the method.

Xi Wang; Huaikou Miao; Liang Guo

2008-01-01

 
 
 
 
101

Semantics-based Refinement of Mandatory Behavior of Sequence Diagrams  

CERN Document Server

Sequence diagrams are a widely used design notation for describing software behaviors. Many reusable software artifacts such as design patterns and design aspects make use of sequence diagrams to describe interaction behaviors. When a pattern or an aspect is reused in an application, it is important to ensure that the sequence diagrams for the application correctly refines the corresponding sequence diagrams for the pattern or aspect. Reasoning about refinement of sequence diagrams has not been addressed adequately in literature. In this paper, we focus on refinement of mandatory behavior specified by a UML sequence diagram. A novel trace semantics is given that captures precisely mandatory behavior specified by a sequence diagram and a refinement relation between sequence diagrams is formalized based on the semantics. Properties of the trace semantics and the refinement relation are studied.

Lu, Lunjin

2010-01-01

102

Perfil UML para el modelado visual de requisitos difusos/ UML Profile for Visual Modeling of Fuzzy Requirements  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Modelar dominios de aplicación que involucren requisitos con términos vagos puede ser un proceso complejo, debido a que las herramientas de modelado disponibles en la actualidad no están concebidas para ello. Sin embargo, muchos requisitos de información en sistemas y aplicaciones actuales podrían involucrar términos vagos del lenguaje natural que expresan las preferencias del usuario. Algunos esfuerzos previos se han hecho en el área de consultas a bases de datos (more) incorporando la lógica difusa para la expresión de tales preferencias. En este trabajo, se define un perfil bajo UML que permite el modelado visual de requisitos de información basados en términos lingüísticos, ejemplo de ellos son los llamados requerimientos fuzzy o difusos. El perfil propuesto se basa en estereotipos y lógica difusa extendida extendido OCL (Object Constraint Language). Dicho perfil posee una semántica formal que permite eliminar ambigüedades, que puede ser representado gráficamente. Se ejemplifica la aplicación del perfil a través de un caso de estudio de la vida real que muestra la sencillez y potencialidad de su uso. Abstract in english Modeling of application domains that include requirements with vague terms may be a complex process because existing modeling tools are not conceived for that. Nevertheless, many real life applications and systems information requirements might involve natural language vague terms for the expression of user preferences. Some previous works in the field of databases add fuzzy logic for preferences expression in querying. In this work, we define a UML profile that allows vi (more) sual modeling of information requirements involving vague linguistics terms, i.e., fuzzy requirements. The proposed profile is based on stereotypes and fuzzy logic extended to OCL. This profile has a formal semantic to avoid ambiguity, moreover it provides diagram representation. We illustrate our profile by means of a real-world case study showing the potential and simplicity of this proposal.

Rodríguez, Rosseline; Goncalves, Marlene

2009-09-01

103

A UML profile for code generation of component based distributed systems  

International Nuclear Information System (INIS)

[en] A consistent and unambiguous implementation of code generation (model to text transformation) from UML (must rely on a well defined UML (Unified Modelling Language) profile, customizing UML for a particular application domain. Such a profile must have a solid foundation in a formally correct ontology, formalizing the concepts and their relations in the specific domain, in order to avoid a maze or set of wildly created stereotypes. The paper describes a generic profile for the code generation of component based distributed systems for control applications, the process to distill the ontology and define the profile, and the strategy followed to implement the code generator. The main steps that take place iteratively include: defining the terms and relations with an ontology, mapping the ontology to the appropriate UML meta-classes, testing the profile by creating modelling examples, and generating the code. This has allowed us to work on the modelling of E-ELT (European Extremely Large Telescope) control system and instrumentation without knowing what infrastructure will be finally used

2012-01-01

104

UML tailored to an ERP framework  

UK PubMed Central (United Kingdom)

Enterprise Resource Planning (ERP) systems are typically developed based on a large framework. This framework is customized by partners to provide solutions to customers. It is therefore of interest to make the development process for the partners as efficient as possible and one way to do this is to provide them with specialized modelling tools. This paper presents our ideas for such a domain specific modelling environment, where the graphical notation is inspired by UML, but incorporates specific aspects unique to the specific framework we are considering.

105

UML2SAN: Toward A New Software Performance Engineering Approach  

Directory of Open Access Journals (Sweden)

Full Text Available Software Performance Engineering (SPE) has recently considered as an important issue in the software development process. It consists on evaluate the performance of a system during the design phase. We have recently proposed a new methodology to generate a Stochastic Automata Network (SAN) model from a UML model, to consequently obtain performance predications from UML specifications. In this paper, we expand our idea to cover more complex UML models taking in advantage the modularity of SAN in modeling large systems. A formal description of the generation process is presented. The new extensiongives rise to a serious approach in SPE that we call UML2SAN.

Ihab Sbeity; Mohamed Dbouk; Ilfat Ghamlouche

2012-01-01

106

Towards Clone Detection in UML Domain Models  

DEFF Research Database (Denmark)

Code clones (i.e., duplicate fragments of code) have been studied for long, and there is strong evidence that they are a major source of software faults. Anecdotal evidence suggests that this phenomenon occurs similarly in models, suggesting that model clones are as detrimental to model quality as they are to code quality. However, programming language code and visual models have significant differences that make it difficult to directly transfer notions and algorithms developed in the code clone arena to model clones. In this article, we develop and propose a definition of the notion of “model clone” based on the thorough analysis of practical scenarios. We propose a formal definition of model clones, specify a clone detection algorithm for UML domain models, and implement it prototypically. We investigate different similarity heuristics to be used in the algorithm, and report the performance of our approach. While we believe that our approach advances the state of the art significantly, it is restricted to UML models, its results leave room for improvements, and there is no validation by field studies.

Störrle, Harald

2013-01-01

107

Solo Diagrams  

UK PubMed Central (United Kingdom)

The calculus of solos is the prex-less subcalculus of the fusioncalculus: it contains only atomic communication actions and theoperators for parallel and scoping. It is expressive enough to admit anencoding of the whole fusion calculus. We here present a graphic representationof agents in the solo calculus, adapting ideas from interactiondiagrams and pi-nets. Our so-called solo diagrams are less complicatedthan these and clarify the important aspects, for example structural congruencein the calculus is precisely isomorphism in the diagrams. Perhapsmost importantly the diagrams contribute to an implementation, replacingthe usual unfolding with a few tractable rules for reducing replicationboxes. Finally we demonstrate the strong similarity with proof nets inlinear logic; it turns out that par and tensor edges have same behaviouras inputs and outputs.1 IntroductionWhen the -calculus was introduced almost fteen years ago one of the mainmotivations was to ...

Cosimo Laneve; Joachim Parrow

108

A review method for UML requirements analysis model employing system-side prototyping.  

UK PubMed Central (United Kingdom)

User interface prototyping is an effective method for users to validate the requirements defined by analysts at an early stage of a software development. However, a user interface prototype system offers weak support for the analysts to verify the consistency of the specifications about internal aspects of a system such as business logic. As the result, the inconsistency causes a lot of rework costs because the inconsistency often makes the developers impossible to actualize the system based on the specifications. For verifying such consistency, functional prototyping is an effective method for the analysts, but it needs a lot of costs and more detailed specifications. In this paper, we propose a review method so that analysts can verify the consistency among several different kinds of diagrams in UML efficiently by employing system-side prototyping without the detailed model. The system-side prototype system does not have any functions to achieve business logic, but visualizes the results of the integration among the diagrams in UML as Web pages. The usefulness of our proposal was evaluated by applying our proposal into a development of Library Management System (LMS) for a laboratory. This development was conducted by a group. As the result, our proposal was useful for discovering the serious inconsistency caused by the misunderstanding among the members of the group.

Ogata S; Matsuura S

2013-12-01

109

Designing role-based access control policies with UML  

Directory of Open Access Journals (Sweden)

Full Text Available The paper analyses role-based access control (RBAC) and two methodologies, namely SecureUML and UMLsec, aiming for designing RBAC policies. The features of both methodologies are represented and compared by modeling the specific system, with special attention to how RBAC policies and principles are modeled using SecureUML and UMLsec

A. Cenys; A. Normantas; L. Radvilavicius

2009-01-01

110

Phase Diagrams  

Science.gov (United States)

This handout and problem set is a stand alone tutorial that introduces students to the basics of phase diagrams and the phase rule. It is a rather lengthy exercise, suitable as a homework assignment. It can replace lectures and yields superior learning.

Perkins, Dexter

111

Mapping UML Component Specifications to JEE Implementations  

Directory of Open Access Journals (Sweden)

Full Text Available Component-based Software Engineering (CbSE) has become a well-accepted approach for developing complex software systems due to its significant advantages on composition and reuse. In practice, however, its use still requires the conjunction of a component specification method that describes how system requirements are satisfied in terms of software components. Such a component specification is then implemented in a variety of software component models (e.g., COM+, CORBA, EJB). To achieve this, a sound mapping from the specification to a designated component model is critical. In addition, for rapid advances on Internet technologies, software systems have gradually been architected as processing in distributed environments. Since a distributed environment involves often synchronous/asynchronous messages communicating among various processes, this paper focuses therefore on the mapping issue from a component specification to a component model that particularly takes into consideration of the communicating of synchronous/asynchronous messages. To illustrate, an on-line e-Learning curriculum order system is modeled for demonstrating the mapping idea. In completing the component specification, we adopt the well-known UML Components method, while in the component model we use the Enterprise Java Beans (EJB) standard in that EJB is the core component model of the JEE (J2EE) platform which supports well distributed operations/services. With such a practical mapping, software systems can be developed in a more effective way by specifying requirements in UML Components and implementing software components in EJB with the communicating of synchronous/asynchronous messages among various processes.

Jyhjong Lin

2007-01-01

112

Las jerarquías conceptuales en UML: comparando la norma ISO 2788 con el metamodelo de UML  

Directory of Open Access Journals (Sweden)

Full Text Available En este artículo llevamos a cabo una comparación entre dos enfoques del modelado de la estructura jerárquica del mundo real: por una parte, las relaciones genérico y todo-parte en un tesauro de descriptores; por otra parte, las relaciones de generalización y agregación en UML. El intento de acortar la distancia entre ambos enfoques conduce a un nuevo metamodelo de relaciones que puede reflejar mejor los hábitos mentales de los modeladores cuando tratan con árboles jerárquicos.

Gonzalo Génova Fuster; Juan Llorens Morillo; José Miguel Fuentes Torres; Jorge Morato Lara; Paloma Martínez Fernández

2011-01-01

113

Stochastic diagrams and Feynman diagrams  

International Nuclear Information System (INIS)

We study the relationship between ordinary perturbation theory and perturbation theory obtained from stochastic quantization. We give a simple proof that, except in gauge theories, the several stochastic diagrams of a given topology are together equivalent to the corresponding Feynman diagram. Our analysis is presented in Minkowski space, but most of it may readily be adapted to euclidean space. The field propagator may be a non-diagonal matrix, such as is the case in real-time thermal field theory. We present a new version of the Langevin equation which directly reproduces the usual axial-gauge perturbation theory. Otherwise, we find that for gauge theories the relationship between ordinary and stochastic perturbation theory is not simple, and we present a recursive method of reconstructing Feynman diagrams from stochastic diagrams, without the need explicitly to introduce ghost fields. We consider both the original Parisi-Wu version of the Langevin equation, and Zwanziger's modified version with its stochastic gauge-fixing term. (orig.).

1985-01-01

114

Grid diagrams of Lorenz links  

CERN Document Server

In paper "A new twist on Lorenz links" (Journal of Topology 2(2009), 227-248) Joan Birman and Ilya Kofman prove the coincidence of the class of Lorenz links and the class of twisted links. The proof in that work is algebraic. We will identify this class in terms of grid diagrams and provide a transparent geometric argument for Birman-Kofman's result.

Razumovsky, Roman

2010-01-01

115

State-transition diagrams for biologists.  

UK PubMed Central (United Kingdom)

It is clearly in the tradition of biologists to conceptualize the dynamical evolution of biological systems in terms of state-transitions of biological objects. This paper is mainly concerned with (but obviously not limited too) the immunological branch of biology and shows how the adoption of UML (Unified Modeling Language) state-transition diagrams can ease the modeling, the understanding, the coding, the manipulation or the documentation of population-based immune software model generally defined as a set of ordinary differential equations (ODE), describing the evolution in time of populations of various biological objects. Moreover, that same UML adoption naturally entails a far from negligible representational economy since one graphical item of the diagram might have to be repeated in various places of the mathematical model. First, the main graphical elements of the UML state-transition diagram and how they can be mapped onto a corresponding ODE mathematical model are presented. Then, two already published immune models of thymocyte behavior and time evolution in the thymus, the first one originally conceived as an ODE population-based model whereas the second one as an agent-based one, are refactored and expressed in a state-transition form so as to make them much easier to understand and their respective code easier to access, to modify and run. As an illustrative proof, for any immunologist, it should be possible to understand faithfully enough what the two software models are supposed to reproduce and how they execute with no need to plunge into the Java or Fortran lines.

Bersini H; Klatzmann D; Six A; Thomas-Vaslin V

2012-01-01

116

Unambiguous UML Composite Structures: The OMEGA2 Experience  

Science.gov (United States)

Starting from version 2.0, UML introduced hierarchical composite structures, which are a very expressive way of defining complex software architectures, but which have a very loosely defined semantics in the standard. In this paper we propose a set of consistency rules that ensure UML composite structures are unambiguous and can be given a precise semantics. Our primary application of the static consistency rules defined in this paper is within the OMEGA UML profile [6], but these rules are general and applicable to other hierarchical component models based on the same concepts, such as MARTE GCM or SysML. The rule set has been formalized in OCL and is currently used in the OMEGA UML compiler.

Ober, Iulian; Dragomir, Iulia

117

An automated approach to map a French terminology to UMLS.  

UK PubMed Central (United Kingdom)

BACKGROUND: CCAM is a French terminology for coding clinical procedures. CCAM is a multi-hierarchical structured classification for procedures used in France for reimbursement in health care, which is external to UMLS. OBJECTIVE: The objective of this work is to describe a French lexical approach allowing mapping CCAM procedures to the UMLS Metathesaurus to achieve interoperability to multiple international terminologies. This approach used a preliminary step intended to take only the significant characters used to code CCAM corresponding to anatomical and actions axes. RESULTS: According to the 7,926 CCAM codes used in this study, 5,212 possible matches (exact matching, single to multiple matching, partial matching) are found using the French CCAM to UMLS based mapping, 65% of the corresponding anatomical terms in the CCAM code are mapped to at least one UMLS Concept and 37% of the corresponding action terms in the CCAM code are mapped to at least one UMLS Concept. For all the exact matches found (n=200), 91% were rated by a human expert as narrower than the mapped UMLS Concepts, while only 3% were irrelevant.

Merabti T; Massari P; Joubert M; Sadou E; Lecroq T; Abdoune H; Rodrigues JM; Darmoni SJ

2010-01-01

118

Number and weights of Feynman diagrams  

International Nuclear Information System (INIS)

The functional techniques of field theory are adapted to the problem of evaluating sums of combinatoric and group-theoretic weights of Feynman diagrams in phi/sup N/, quantum electrodynamics and non-Abelian theories. Considered are various classes of diagrams such as connected, one-particle-irreducible, and skeleton diagrams. For finite orders exact sume are given by compact recursion formulas. For higher orders estimates are obtained from the exact results or by steepest-descent methods.

1978-01-01

119

Resummation of Cactus Diagrams in Lattice QCD  

CERN Multimedia

We show how to perform a resummation, to all orders in perturbation theory, of a certain class of gauge invariant diagrams in Lattice QCD. These diagrams are often largely responsible for lattice artifacts. Our resummation leads to an improved perturbative expansion. Applied to a number of cases of interest, this expansion yields results remarkably close to corresponding nonperturbative estimates.

Panagopoulos, H

1998-01-01

120

Using UML to Model Web Services for Automatic Composition  

Directory of Open Access Journals (Sweden)

Full Text Available There is a great interest paid to the web services paradigm nowadays. One ofthe most important problems related to the web service paradigm is theautomatic composition of web services. Several frameworks have beenproposed to achieve this novel goal. The most recent and richest framework(model) is the Colombo model. However, even for experienced developers,working with Colombo formalisms is low-level, very complex and timeconsuming.We propose to use UML (Unified Modeling Language) to modelservices and service composition in Colombo. By using UML, the web servicedeveloper will deal with the high level graphical models of UML avoiding thedifficulties of working with the low-level and complex details of Colombo. To beable to use Colombo automatic composition algorithm, we propose torepresent Colombo by a set of related XML document types that can be abase for a Colombo language. Moreover, we propose the transformation rulesbetween UML and Colombo proposed XML documents. Next Colomboautomatic composition algorithm can be applied to build a composite servicethat satisfies a given user request. A prototypical implementation of theproposed approach is developed using Visual Paradigm for UML.

Amal Elgammal; Mohamed El-Sharkawi

2010-01-01

 
 
 
 
121

Phase Diagram of Water  

Science.gov (United States)

An interactive phase diagram of water is presented that allows the user to click on any position on the diagram. A molecular level animation is presented showing the phase(s) represented at the selected position on the diagram.

122

Refactoring UML Diagrams and Models with Model-to-Model Transformations  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Software is becoming increasingly important in everyday life and is becoming increasingly complex as well. Techniques have been developed to reduce the complexity, e.g. abstract modelling, model-driven development and refactoring code structure. Refactoring is a systematic approach to restructure co...

Hafsteinn Þór Einarsson 1981

123

Performance Analysis of System Model Based on UML State Diagrams and Continuous-time Markov Chains  

Digital Repository Infrastructure Vision for European Research (DRIVER)

If software architecture is assigned with formal semantics, then auto...

Yefei Zhao; Zongyuan Yang; Jinkui Xie; Qiang Liu

124

Ontology Based Semantics Checking for UML Activity Model  

Directory of Open Access Journals (Sweden)

Full Text Available UML activity model is mainly used to model the behaviors of software system and the quality of activity model will influence the quality of software system. But because the UML activity model lacks strictly formal semantics, it is difficult to make formal semantics analysis and checking for activity model. An ontology based method of semantics checking for activity model is proposed. The semantics of activity model is divided into static semantics and dynamic semantics. The static semantics is transformed into OWL DL by an algorithm, and the dynamic semantics is described by DL-Safe rules. Then the consistency of UML activity model is analyzed and some model checking rules are defined, which enables model consistency checking by using an ontology reasoning tool.

Zhixue Wang; Hongyue He; Li Chen; Ying Zhang

2012-01-01

125

Application Of UML In Real-Time Embedded Systems  

Directory of Open Access Journals (Sweden)

Full Text Available The UML was designed as a graphical notation for use with object-oriented systems and applications. Because of its popularity, now it is emerging in the field of embedded systems design as a modeling language. The UML notation is useful in capturing the requirements, documenting the structure, decomposing into objects and defining relationships between objects. It is a notational language that is very useful in modelling the real-time embedded systems. This paper presents the requirements and analysis modelling of a real-time embedded system related to a control system application for platformstabilization using COMET method of design with UML notation. These applications involve designing of electromechanical systems that are controlled by multi-processors.

Aman Kaur; Rajeev Arora

2012-01-01

126

Event Modeling in UML. Unified Modeling Language and Unified Process  

DEFF Research Database (Denmark)

We show how events can be modeled in terms of UML. We view events as change agents that have consequences and as information objects that represent information. We show how to create object-oriented structures that represent events in terms of attributes, associations, operations, state charts, and messages. We outline a run-time environment for the processing of events with multiple participants.

Bækgaard, Lars

2002-01-01

127

Postopek transakcije ruralnih zemljiš? v zapisu UML : UML notation for the rural land transaction procedure  

Directory of Open Access Journals (Sweden)

Full Text Available Nepremi?nine predstavljajo pomemben dejavnik družbene blaginje, zato pripisuje današnja družba veliko pozornosti nepremi?ninskim transakcijam, ki so pogosto zapleten postopek. Z namenom analiziratiosnovni potek nepremi?ninskih transakcij smo se pri nalogi osredoto?ili na ožje podro?je, to je na transakcije ruralnih zemljiš? v Sloveniji, kar omogo?a poenostavitev obravnavanega problema. Osnovni namen je izboljšati razumevanje delovanja zemljiškega trga, tudi z vidika vpletenih institucij. Cilj prispevka je med drugim prepoznati dejavnike, ki vplivajo na transakcije ruralnih zemljiš? in ki ovirajo razvoj zemljiškega trga, še posebno z organizacijskega vidika. Pravice, raba in posledi?no transakcije ruralnih zemljiš? kot nosilcev posebnih okoljskih, gospodarskihin družbenih funkcij so uravnani s strogimi sektorskimi zakoni in pravilniki države in lokalne skupnosti. Posebnosti transakcij ruralnih zemljiš?, ki vklju?ujejo kmetijska zemljiš?a, gozdove in kmetije, so po slovenski zakonodaji javna ponudba, zakonsko dolo?enprednostni red predkupnih upravi?encev in odobritev prodaje pristojne upravne enote. Omenjeni postopek prepre?uje neposredno komunikacijo med aktivnimi udeleženci zemljiškega trga, to je med prodajalci in kupci. Neposredna komunikacija predstavlja osnovnimehanizem u?inkovitega nepremi?ninskega trga in vpliva na odlo?ilni tržni sili, na ponudbo in povpraševanje. V prispevku je predstavljen postopek transakcije ruralnih zemljiš? z uporabo UML-zapisa.Poudarek je na dinami?ni naravi postopka prodaje ruralnih zemljiš?.

Anka Lisec; Miran Ferlan; Radoš Šumrada

2007-01-01

128

Performance evaluation of enterprise architecture using fuzzy sequence diagram  

Directory of Open Access Journals (Sweden)

Full Text Available Developing an Enterprise Architecture is a complex task and to control the complexity of the regulatory framework we need to measure the relative performance of one system against other available systems. On the other hand, enterprise architecture cannot be organized without the use of a logical structure. The framework provides a logical structure for classifying architectural output. Among the common architectural framework, the C4ISR framework and methodology of the product is one of the most popular techniques. In this paper, given the existing uncertainties in system development and information systems, a new version of UML called Fuzzy-UML is proposed for enterprise architecture development based on fuzzy Petri nets. In addition, the performance of the system is also evaluated based on Fuzzy sequence diagram.

Mohammad Atasheneh; Ali Harounabadi; Seyyed Javad Mirabedini

2014-01-01

129

Why Systems-on-Chip Needs More UML like a Hole in the Head  

CERN Multimedia

Let's be clear from the outset: SoC can most certainly make use of UML; SoC just doesn't need more UML, or even all of it. The advent of model mappings, coupled with marks that indicate which mapping rule to apply, enable a major simplification of the use of UML in SoC.

Mellor, Stephen J; Mccausland, Campbell

2011-01-01

130

Phase Diagrams and Chemographic Projections  

Science.gov (United States)

This exercise is a good way to get students thinking about the phase rule, metastable and stable reactions and phase diagrams. The exercise contains a lot of reading, and is suitable for in-class work or for homework. The idea is that students can do this on their own with little help from their instructor. The students only answer a few questions making this is more of a tutorial than a worksheet.

Perkins, Dexter

131

UML notation for the rural land transaction procedure : Postopek transakcije ruralnih zemljiš? v zapisu UML  

Directory of Open Access Journals (Sweden)

Full Text Available Real property significantly contributes to the prosperity of today’s society. Therefore, the society has paid muchattention to the real property transaction, which is often a complex procedure. In order to enable the analysis of its general structure we have focused on a particular domain, i.e. the rural land transaction in Slovenia,which allows us to reduce the complexity of the phenomena involved. The purpose of the paper is to increase our understanding on how rural land markets act in an institutional context. It is also aimed atidentifying the obstacles in rural land transactions, particularly in terms of organizational framework,which hinder the development of the rural land market. Rights, use and consequently transaction of the rural land, as the holder of specific environmental, economicand societal functions, are strongly regulated by the specific legislation and regulations of the government and local communities. The specific procedures of rural land transactions related to the agricultural land,forests and farms according to the Slovenian legislation are: the public announcement of the sale, the order ofpre-emption beneficiaries according to law, and the approval of sale from the relevant administration office. This procedure prevents the active actors in the land market, vendors and buyers, from direct communication, which is the vital mechanism of any effective property market, affecting the crucial market forces: demand and supply. In the article the UML notation is used to represent the process of rural land transactions. The emphasis is on the dynamic flow of the rural land sale process.

Anka Lisec; Miran Ferlan; Radoš Šumrada

2007-01-01

132

MDA based-approach for UML Models Complete Comparison  

CERN Document Server

If a modeling task is distributed, it will frequently be necessary to integrate models developed by different team members. Problems occur in the models integration step and particularly, in the comparison phase of the integration. This issue had been discussed in several domains and various models. However, previous approaches have not correctly handled the semantic comparison. In the current paper, we provide a MDA-based approach for models comparison which aims at comparing UML models. We develop an hybrid approach which takes into account syntactic, semantic and structural comparison aspects. For this purpose, we use the domain ontology as well as other resources such as dictionaries. We propose a decision support system which permits the user to validate (or not) correspondences extracted in the comparison phase. For implementation, we propose an extension of the generic correspondence metamodel AMW in order to transform UML models to the correspondence model.

Chaouni, Samia Benabdellah; Mouline, Salma

2011-01-01

133

UML based risk analysis - Application to a medical  

UK PubMed Central (United Kingdom)

Medical robots can perform complex tasks and share their working area with humans. Therefore, they belong to safety critical systems. In nowadays development process, safety is often managed by the way of dependability techniques. We propose a new global approach, based on the risk concept in order to guide designers along the safety analysis of such complex systems. Safety depends on risk management activity, which core is risk analysis. This one consists in three steps : system definition, hazard identification and risk estimation. We first propose the use of UML (Unified Modeling Language) as the description language. Then, for the next steps, interactions of UML and risk analysis techniques such as FMECA (Failure Mode, E#ects and Criticality Analysis) are studied. As an illustration of its potentiality, the proposed approach has been applied to the case study of a system for robotic tele-echography (ultrasound scan examination).

J. Guiochet; C. Baron

134

MDA based-approach for UML Models Complete Comparison  

Directory of Open Access Journals (Sweden)

Full Text Available If a modeling task is distributed, it will frequently be necessary to integrate models developed by different team members. Problems occur in the models integration step and particularly, in the comparison phase of the integration. This issue had been discussed in several domains and various models. However, previous approaches have not correctly handled the semantic comparison. In the current paper, we provide a MDA-based approach for models comparison which aims at comparing UML models. We develop an hybrid approach which takes into account syntactic, semantic and structural comparison aspects. For this purpose, we use the domain ontology as well as other resources such as dictionaries. We propose a decision support system which permits the user to validate (or not) correspondences extracted in the comparison phase. For implementation, we propose an extension of the generic correspondence metamodel AMW in order to transform UML models to the correspondence model.

Samia Benabdellah Chaouni; Mounia Fredj; Salma Mouline

2011-01-01

135

Intervocabulary Mapping Within the UMLS: The Role of Lexical Matching*  

Science.gov (United States)

Within the NLM's UMLS Project, one challenge is mapping concepts from one information resource to another. While a complete solution to this problem requires construction of a comprehensive biomedical thesaurus, the present research provides evidence that considerable progress can be made with a straightforward lexical approach. Furthermore, such a lexical approach is the only practical way to begin construction of, and maintain, any such thesaurus. Related research has demonstrated the regularity of word usage within the context of biomedicine. This regularity suggests that mapping between biomedical information resources that have a constrained vocabulary can use lexical matching techniques with considerable success. A method has been developed to map ‘phrases’ from candidate sources to MeSH. In one experiment, this method attempts to map 834 disease names from the disease descriptions composed at UCSF for the UMLS. In a second experiment, the same method attempts to map disease attributes from these diseases.

Sherertz, D.D.; Tuttle, M.S.; Blois, M.S.; Erlbaum, M.S.

1988-01-01

136

Intervocabulary Mapping Within the UMLS: The Role of Lexical Matching*.  

UK PubMed Central (United Kingdom)

Within the NLM's UMLS Project, one challenge is mapping concepts from one information resource to another. While a complete solution to this problem requires construction of a comprehensive biomedical thesaurus, the present research provides evidence that considerable progress can be made with a straightforward lexical approach. Furthermore, such a lexical approach is the only practical way to begin construction of, and maintain, any such thesaurus. Related research has demonstrated the regularity of word usage within the context of biomedicine. This regularity suggests that mapping between biomedical information resources that have a constrained vocabulary can use lexical matching techniques with considerable success. A method has been developed to map ‘phrases’ from candidate sources to MeSH. In one experiment, this method attempts to map 834 disease names from the disease descriptions composed at UCSF for the UMLS. In a second experiment, the same method attempts to map disease attributes from these diseases.

Sherertz DD; Tuttle MS; Blois MS; Erlbaum MS

1988-11-01

137

Efficient Algorithms for Verification of UML Statechart Models  

Directory of Open Access Journals (Sweden)

Full Text Available In this article, we present algorithms devised for the automatic verification of UML(Unified Modeling Language) statechart models. The basic algorithm checks the safety property violation during the construction (on-the-fly) of the state space graph and if any property violation is found, it generates a counter example. The second algorithm builds the state space considering only those events, which could lead to the negative behavior of the system. In other words, a set of relevant events is generated first and state space is constructed considering only the state transitions of the objects caused by these relevant events. Thus search space is reduced in both the methods. As a case study, we have verified UML statechart model of the Generalized Railroad Crossing (GRC) system using the proposed algorithms. The safety property “When the train is at rail road crossing, the gate always remain closed” is verified. We could detect property violation in the initial UML statechart model of GRC and eventually it is corrected with the help of the counter example generated by the algorithms. The case study results show that event based verification algorithm yields 59% reduction in the state space for the GRC example.

C.M. Prashanth; K. Chandrashekhar Shet

2009-01-01

138

A UML Semantics FAQ: The View from Bremen  

UK PubMed Central (United Kingdom)

This note spells out questions the authors found while studying the materialdefining the Unified Modeling Language UML. After formulating a preliminaryquestion in Sec. 1, some detailed questions with answers and some detailedquestions without answers are given in Sec. 2 and 3, respectively. Sections 4and 5 just state questions with and without answers but we do not go into detailsexplaining the importance of the questions. Our answers to the `questions withanswers' can be found in our recent papers [GR98c, GR98b, GP98, GR98a,Gog98, RG98]. In Sec. 6, a short hint to relevant literature ends this note.MottoNow when the queen of Sheba heard about the fame of Solomon concerningthe name of the LORD, she came to test him with difficult questions.New American Standard Bible, Book 1 Kings 10:1, http://bible.gospelcom.net/bible, 1999.1 A Preliminary QuestionQUESTION: What are (currently and in the future) the reference documents forUML, especially for a UML Semanti...

Martin Gogolla; Oliver Radfelder; Mark Richters

139

Model driven development of plug-ins for UML based modeling tools Modeliavimu grindžiamo UML ?ranki? ?skiepi? k?rimo metodika ir jos realizavimas  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This dissertation presents the principles and examples for building AMI for UML-based modeling environments. Modelers may use proposed AMI interface to extend UML modeling tools by modeling plug-ins using modeling tools itself. The work discusses four cases of AMI realization implemented in MagicDra...

Vitiutinas, Ruslanas

140

Model Checking Synchronous Timing Diagrams  

UK PubMed Central (United Kingdom)

Model checking is an automated approach to the formal verificationof hardware and software. To allow model checking tools to beused by the hardware or software designers themselves, instead of byverification experts, the tools should support specification methods thatcorrespond closely to the common usage. For hardware systems, timingdiagrams form such a commonly used and visually appealing specificationmethod. In this paper, we introduce a class of synchronous timingdiagrams with a syntax and a formal semantics that is close to the informalusage. We present an efficient, decompositional algorithm for modelchecking such timing diagrams. This algorithm has been implemented ina user-friendly tool called RTDT (the Regular Timing Diagram Translator). We have applied this tool to verify several properties of Lucent'sPCI synthesizable core.1

Nina Amla; E. Allen Emerson; Robert P. Kurshan; Kedar S. Namjoshi

 
 
 
 
141

Model Checking Synchronous Timing Diagrams  

UK PubMed Central (United Kingdom)

Model checking is an automated approach to the formal verificationof hardware and software. To allow model checking tools to beused by the hardware or software designers themselves, instead of byverification experts, the tools should support specification methods thatcorrespond closely to the common usage. For hardware systems, timingdiagrams form such a commonly used and visually appealing specificationmethod. In this paper, we introduce a class of synchronous timingdiagrams with a syntax and a formal semantics that is close to the informalusage. We present an efficient, decompositional algorithm for modelchecking such timing diagrams. This algorithm has been implemented ina user-friendly tool called RTDT (the Regular Timing Diagram Translator). We have applied this tool to verify several properties of Lucent'sPCI synthesizable core.

Nina Amla; E. Allen Emerson; Robert P. Kurshan; Kedar S. Namjoshi

142

Integrating UML, the Q-model and a Multi-Agent Approach in Process Specifications and Behavioural Models of Organisations  

Directory of Open Access Journals (Sweden)

Full Text Available Efficient estimation and representation of an organisation's behaviour requires specification of business processes and modelling of actors' behaviour. Therefore the existing classical approaches that concentrate only on planned processes are not suitable and an approach that integrates process specifications with behavioural models of actors should be used instead. The present research indicates that a suitable approach should be based on interactive computing. This paper examines the integration of UML diagrams for process specifications, the Q-model specifications for modelling timing criteria of existing and planned processes and a multi-agent approach for simulating non-deterministic behaviour of human actors in an organisation. The corresponding original methodology is introduced and some of its applications as case studies are reviewed.

Raul Savimaa

2005-01-01

143

A tool for sharing annotated research data: the "Category 0" UMLS (Unified Medical Language System) vocabularies  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Large biomedical data sets have become increasingly important resources for medical researchers. Modern biomedical data sets are annotated with standard terms to describe the data and to support data linking between databases. The largest curated listing of biomedical terms is the the National Library of Medicine's Unified Medical Language System (UMLS). The UMLS contains more than 2 million biomedical terms collected from nearly 100 medical vocabularies. Many of the vocabularies contained in the UMLS carry restrictions on their use, making it impossible to share or distribute UMLS-annotated research data. However, a subset of the UMLS vocabularies, designated Category 0 by UMLS, can be used to annotate and share data sets without violating the UMLS License Agreement. Methods The UMLS Category 0 vocabularies can be extracted from the parent UMLS metathesaurus using a Perl script supplied with this article. There are 43 Category 0 vocabularies that can be used freely for research purposes without violating the UMLS License Agreement. Among the Category 0 vocabularies are: MESH (Medical Subject Headings), NCBI (National Center for Bioinformatics) Taxonomy and ICD-9-CM (International Classification of Diseases-9-Clinical Modifiers). Results The extraction file containing all Category 0 terms and concepts is 72,581,138 bytes in length and contains 1,029,161 terms. The UMLS Metathesaurus MRCON file (January, 2003) is 151,048,493 bytes in length and contains 2,146,899 terms. Therefore the Category 0 vocabularies, in aggregate, are about half the size of the UMLS metathesaurus. A large publicly available listing of 567,921 different medical phrases were automatically coded using the full UMLS metatathesaurus and the Category 0 vocabularies. There were 545,321 phrases with one or more matches against UMLS terms while 468,785 phrases had one or more matches against the Category 0 terms. This indicates that when the two vocabularies are evaluated by their fitness to find at least one term for a medical phrase, the Category 0 vocabularies performed 86% as well as the complete UMLS metathesaurus. Conclusion The Category 0 vocabularies of UMLS constitute a large nomenclature that can be used by biomedical researchers to annotate biomedical data. These annotated data sets can be distributed for research purposes without violating the UMLS License Agreement. These vocabularies may be of particular importance for sharing heterogeneous data from diverse biomedical data sets. The software tools to extract the Category 0 vocabularies are freely available Perl scripts entered into the public domain and distributed with this article.

Berman Jules J

2003-01-01

144

Mapping terms to UMLS concepts of the same semantic type.  

UK PubMed Central (United Kingdom)

We are interested in mapping terms from the biomedical literature to controlled terminologies. For clinical and related terms, we rely on the MetaMap program for mapping terms to the UMLS Metathesaurus, accepting term assignments that have a reasonable match score. In a sizable number of cases, terms are ambiguous, and MetaMap proposes several mapping candidates. To address these cases prior studies investigated Word Sense Disambiguation (WSD) strategies for selecting between concepts of different semantic types. Here, we investigated the situation where MetaMap proposes concepts that share the same semantic type. We present an ontology-based strategy for selecting between these concepts.

Tran N; Luong T; Krauthammer M

2007-01-01

145

Associating clinical archetypes through UMLS Metathesaurus term clusters.  

UK PubMed Central (United Kingdom)

Clinical archetypes are modular definitions of clinical data, expressed using standard or open constraint-based data models as the CEN EN13606 and openEHR. There is an increasing archetype specification activity that raises the need for techniques to associate archetypes to support better management and user navigation in archetype repositories. This paper reports on a computational technique to generate tentative archetype associations by mapping them through term clusters obtained from the UMLS Metathesaurus. The terms are used to build a bipartite graph model and graph connectivity measures can be used for deriving associations.

Lezcano L; Sánchez-Alonso S; Sicilia MA

2012-06-01

146

Associating clinical archetypes through UMLS Metathesaurus term clusters.  

Science.gov (United States)

Clinical archetypes are modular definitions of clinical data, expressed using standard or open constraint-based data models as the CEN EN13606 and openEHR. There is an increasing archetype specification activity that raises the need for techniques to associate archetypes to support better management and user navigation in archetype repositories. This paper reports on a computational technique to generate tentative archetype associations by mapping them through term clusters obtained from the UMLS Metathesaurus. The terms are used to build a bipartite graph model and graph connectivity measures can be used for deriving associations. PMID:20827566

Lezcano, Leonardo; Sánchez-Alonso, Salvador; Sicilia, Miguel-Angel

2010-09-09

147

Applying UML and MDA to Real Systems Design  

CERN Multimedia

Traditionally system design has been made from a black box/functionality only perspective which forces the developer to concentrate on how the functionality can be decomposed and recomposed into so called components. While this technique is well established and well known it does suffer fromsome drawbacks; namely that the systems produced can often be forced into certain, incompatible architectures, difficult to maintain or reuse and the code itself difficult to debug. Now that ideas such as the OMG's Model Based Architecture (MDA) or Model Based Engineering (MBE) and the ubiquitous modelling language UML are being used (allegedly) and desired we face a number of challenges to existing techniques.

Oliver, Ian

2011-01-01

148

Leveraging the UML Metamodel: Expressing ORM Semantics Using a UML Profile  

Energy Technology Data Exchange (ETDEWEB)

Object Role Modeling (ORM) techniques produce a detailed domain model from the perspective of the business owner/customer. The typical process begins with a set of simple sentences reflecting facts about the business. The output of the process is a single model representing primarily the persistent information needs of the business. This type of model contains little, if any reference to a targeted computerized implementation. It is a model of business entities not of software classes. Through well-defined procedures, an ORM model can be transformed into a high quality objector relational schema.

CUYLER,DAVID S.

2000-11-01

149

Integrating decision management with UML modeling concepts and tools  

DEFF Research Database (Denmark)

Numerous design decisions including architectural decisions are made while developing a software system, which influence the architecture of the system as well as subsequent decisions. Several tools already exist for managing design decisions, i.e. capturing, documenting, and maintaining them, but also for guiding the user by proposing subsequent decisions. In model-based software development, many decisions directly affect the structural and behavioral models used to describe and develop a software system and its architecture. However, the decisions are typically not connected to these models. In this paper, we propose an integration of a decision management and a UML-based modeling tool, based on use cases we distill from an example: the UML modeling tool shall show all decisions related to a model and allow extending or updating them; the decision management tool shall trigger the modeling tool to enforce design decisions (modify the models). We define tool-independent concepts and architecture building blocks supporting these requirements and present first ideas how this can be implemented in the IBM Rational Software Modeler and Architectural Decision Knowledge Wiki. This seamless integration of formerly disconnected tools could improve tool usability as well as decision maker productivity.

Könemann, Patrick

2009-01-01

150

Using UML Behavioral Model to Support Aspect Oriented Model  

Directory of Open Access Journals (Sweden)

Full Text Available Aspect oriented software development is an emerging paradigm of software development. The notion of this technique is separation of concerns which means to implement each concern in a single object in object oriented programming but still there are concerns which are distributed on different objects and are called crosscutting concerns while another form is Core concerns are the core functionality provided by the system but crosscutting concerns are the concerns like logging, performance etc. Modeling of aspect oriented software is different from the normal modeling of object-oriented or procedural language software, because aspects don’t have the independent identity or existence and they are tightly coupled to their woven context so it is difficult to model them. The one aim of our research paper is to explore the domain of Modeling of the aspect-oriented software. The goal of this research paper is to give a UML Behavioral modeling techniques in the domain of aspect oriented software development. This technique of generating UML Behavioral Model for aspects will give better understating of separations concerns.

Zahid Hussain Qaisar; Nauman Anwar; Shafiq Ur Rehman

2013-01-01

151

Social network diagram.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

A diagram that shows at a glance the social network and support of patients was found useful in a follow-up study of patients with strokes. We believe that the diagram would prove valuable in medical case records and should be an essential part of medical-social reports, particularly for patients at...

Capildeo, R; Court, C; Rose, F C

152

Collocation analysis for UMLS knowledge-based word sense disambiguation  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background The effectiveness of knowledge-based word sense disambiguation (WSD) approaches depends in part on the information available in the reference knowledge resource. Off the shelf, these resources are not optimized for WSD and might lack terms to model the context properly. In addition, they might include noisy terms which contribute to false positives in the disambiguation results. Methods We analyzed some collocation types which could improve the performance of knowledge-based disambiguation methods. Collocations are obtained by extracting candidate collocations from MEDLINE and then assigning them to one of the senses of an ambiguous word. We performed this assignment either using semantic group profiles or a knowledge-based disambiguation method. In addition to collocations, we used second-order features from a previously implemented approach. Specifically, we measured the effect of these collocations in two knowledge-based WSD methods. The first method, AEC, uses the knowledge from the UMLS to collect examples from MEDLINE which are used to train a Naïve Bayes approach. The second method, MRD, builds a profile for each candidate sense based on the UMLS and compares the profile to the context of the ambiguous word. We have used two WSD test sets which contain disambiguation cases which are mapped to UMLS concepts. The first one, the NLM WSD set, was developed manually by several domain experts and contains words with high frequency occurrence in MEDLINE. The second one, the MSH WSD set, was developed automatically using the MeSH indexing in MEDLINE. It contains a larger set of words and covers a larger number of UMLS semantic types. Results The results indicate an improvement after the use of collocations, although the approaches have different performance depending on the data set. In the NLM WSD set, the improvement is larger for the MRD disambiguation method using second-order features. Assignment of collocations to a candidate sense based on UMLS semantic group profiles is more effective in the AEC method. In the MSH WSD set, the increment in performance is modest for all the methods. Collocations combined with the MRD disambiguation method have the best performance. The MRD disambiguation method and second-order features provide an insignificant change in performance. The AEC disambiguation method gives a modest improvement in performance. Assignment of collocations to a candidate sense based on knowledge-based methods has better performance. Conclusions Collocations improve the performance of knowledge-based disambiguation methods, although results vary depending on the test set and method used. Generally, the AEC method is sensitive to query drift. Using AEC, just a few selected terms provide a large improvement in disambiguation performance. The MRD method handles noisy terms better but requires a larger set of terms to improve performance.

Jimeno-Yepes Antonio; Mclnnes Bridget T; Aronson Alan R

2011-01-01

153

Collocation analysis for UMLS knowledge-based word sense disambiguation.  

UK PubMed Central (United Kingdom)

BACKGROUND: The effectiveness of knowledge-based word sense disambiguation (WSD) approaches depends in part on the information available in the reference knowledge resource. Off the shelf, these resources are not optimized for WSD and might lack terms to model the context properly. In addition, they might include noisy terms which contribute to false positives in the disambiguation results. METHODS: We analyzed some collocation types which could improve the performance of knowledge-based disambiguation methods. Collocations are obtained by extracting candidate collocations from MEDLINE and then assigning them to one of the senses of an ambiguous word. We performed this assignment either using semantic group profiles or a knowledge-based disambiguation method. In addition to collocations, we used second-order features from a previously implemented approach.Specifically, we measured the effect of these collocations in two knowledge-based WSD methods. The first method, AEC, uses the knowledge from the UMLS to collect examples from MEDLINE which are used to train a Naïve Bayes approach. The second method, MRD, builds a profile for each candidate sense based on the UMLS and compares the profile to the context of the ambiguous word.We have used two WSD test sets which contain disambiguation cases which are mapped to UMLS concepts. The first one, the NLM WSD set, was developed manually by several domain experts and contains words with high frequency occurrence in MEDLINE. The second one, the MSH WSD set, was developed automatically using the MeSH indexing in MEDLINE. It contains a larger set of words and covers a larger number of UMLS semantic types. RESULTS: The results indicate an improvement after the use of collocations, although the approaches have different performance depending on the data set. In the NLM WSD set, the improvement is larger for the MRD disambiguation method using second-order features. Assignment of collocations to a candidate sense based on UMLS semantic group profiles is more effective in the AEC method.In the MSH WSD set, the increment in performance is modest for all the methods. Collocations combined with the MRD disambiguation method have the best performance. The MRD disambiguation method and second-order features provide an insignificant change in performance. The AEC disambiguation method gives a modest improvement in performance. Assignment of collocations to a candidate sense based on knowledge-based methods has better performance. CONCLUSIONS: Collocations improve the performance of knowledge-based disambiguation methods, although results vary depending on the test set and method used. Generally, the AEC method is sensitive to query drift. Using AEC, just a few selected terms provide a large improvement in disambiguation performance. The MRD method handles noisy terms better but requires a larger set of terms to improve performance.

Jimeno-Yepes A; McInnes BT; Aronson AR

2011-01-01

154

Requirements for UML and OWL Integration Tool for User Data Consistency Modeling and Testing  

DEFF Research Database (Denmark)

The amount of data available on the Internet is continuously increasing, consequentially there is a growing need for tools that help to analyse the data. Testing of consistency among data received from different sources is made difficult by the number of different languages and schemas being used. In this paper we analyze requirements for a tool that support integration of UML models and ontologies written in languages like the W3C Web Ontology Language (OWL). The tool can be used in the following way: after loading two legacy models into the tool, the tool user connects them by inserting modeling constructs like classes, associations and Object Constraint Language (OCL) statements. It is the tool users responsibility to connected the legacy models in such a way that consistency is beeing explicitly defined. A special modeling technique it to be used when specifying possible consistencies violations, an important part of this technique is attaching of OCL expressions to special boolean class attributes that we call consistency attributes. The resulting integration model can be used for automatic consistency testing of two instances of the legacy models by automatically instantiate the whole integration model and then report consistency attribute values that are false.

Nytun, J. P.; Jensen, Christian SØndergaard

2003-01-01

155

Modelling e verification language testbenches in UML 2.0 with theme and marte  

Digital Repository Infrastructure Vision for European Research (DRIVER)

peer-reviewed , This document presents a metamodel for the e Hardware Verification Language through example. The e metamodel is captured as a UML 2 profile (UML's mechanism for lightweight extension). Stereotypes from this profile can be used at the modeling level as annotations on models of hard...

Linehan, Eamonn; Clarke, Siobhán

156

From system requirements to source code: transitions in UML and RUP  

Directory of Open Access Journals (Sweden)

Full Text Available There are many manuals explaining language specification among UML-related books. Only some of books mentioned concentrate on practical aspects of using the UML language in effective way using CASE tools and RUP. The current paper presents transitions from system requirements specification to structural source code, useful while developing an information system.

Stanis?aw Wrycza; Bartosz Marcinkowski

2011-01-01

157

The Use of UML to Development of a Railway Interlocking System The Use of UML to Development of a Railway Interlocking System  

Directory of Open Access Journals (Sweden)

Full Text Available The paper deals with problems of using the Unifield Modeling Lanfuage (UML) in developmentt of new railway interlocking and signalling systems. A simplifield example of the control circuit of a point machine is used to demonstrate an object-oriented approach to specifying the functional safety requirements. An informal specification given by the relevant technical standart is used as a starting point and results in semi-formal specification based on UML model. Advantages of the presented approach are discussed and new trends of increasing formality of UML models are indicated within conclusions.The paper deals with problems of using the Unifield Modeling Lanfuage (UML) in developmentt of new railway interlocking and signalling systems. A simplifield example of the control circuit of a point machine is used to demonstrate an object-oriented approach to specifying the functional safety requirements. An informal specification given by the relevant technical standart is used as a starting point and results in semi-formal specification based on UML model. Advantages of the presented approach are discussed and new trends of increasing formality of UML models are indicated within conclusions.

Karol Rastocny; Ales Janota; Jiri Zahradnik

2003-01-01

158

Test Case Generation Based on Use case and Sequence Diagram  

Directory of Open Access Journals (Sweden)

Full Text Available We present a comprehensive test case generation technique from UMLmodels. We use the features in UML 2.0 sequence diagram includingconditions, iterations, asynchronous messages and concurrent components.In our approach, test cases are derived from analysis artifacts such as usecases, their corresponding sequence diagrams and constraints specifiedacross all these artifacts. We construct Use case Dependency Graph (UDG)from use case diagram and Concurrent Control Flow Graph (CCFG) fromcorresponding sequence diagrams for test sequence generation. We focustesting on sequences of messages among objects of use case scenarios.Our testing strategy derives test cases using full predicate coverage criteria.Our proposed test case generation technique can be used for integration andsystem testing accommodating the object message and condition informationassociated with the use case scenarios. The test cases thus generated aresuitable for detecting synchronization and dependency of use cases andmessages, object interaction and operational faults. Finally, we have madean analysis and comparison of our approach with existing approaches, whichare based on other coverage criterion through an example.

Santosh Kumar Swain; Durga Prasad Mohapatra; Rajib Mall

2010-01-01

159

Visual Modelling of Data Warehousing Flows with UML Profiles  

Science.gov (United States)

Data warehousing involves complex processes that transform source data through several stages to deliver suitable information ready to be analysed. Though many techniques for visual modelling of data warehouses from the static point of view have been devised, only few attempts have been made to model the data flows involved in a data warehousing process. Besides, each attempt was mainly aimed at a specific application, such as ETL, OLAP, what-if analysis, data mining. Data flows are typically very complex in this domain; for this reason, we argue, designers would greatly benefit from a technique for uniformly modelling data warehousing flows for all applications. In this paper, we propose an integrated visual modelling technique for data cubes and data flows. This technique is based on UML profiling; its feasibility is evaluated by means of a prototype implementation.

Pardillo, Jesús; Golfarelli, Matteo; Rizzi, Stefano; Trujillo, Juan

160

Rerendering Semantic Ontologies Automatic Extensions to UMLS through Corpus Analytics  

CERN Multimedia

In this paper, we discuss the utility and deficiencies of existing ontology resources for a number of language processing applications. We describe a technique for increasing the semantic type coverage of a specific ontology, the National Library of Medicine's UMLS, with the use of robust finite state methods used in conjunction with large-scale corpus analytics of the domain corpus. We call this technique "semantic rerendering" of the ontology. This research has been done in the context of Medstract, a joint Brandeis-Tufts effort aimed at developing tools for analyzing biomedical language (i.e., Medline), as well as creating targeted databases of bio-entities, biological relations, and pathway data for biological researchers. Motivating the current research is the need to have robust and reliable semantic typing of syntactic elements in the Medline corpus, in order to improve the overall performance of the information extraction applications mentioned above.

Pustejovsky, J; Castano, J

2002-01-01

 
 
 
 
161

SUITABILITY OF UML STATE MACHINE FOR MODELING CHOREOGRAPHY OF SERVICES  

Directory of Open Access Journals (Sweden)

Full Text Available Recently, a lot of research works have attempted to model the choreography of services by differentlanguages. Each language models the choreography on the basis of different view and level of abstraction.The features of each language demonstrate how much it is suitable for service choreography modeling.Among all languages, WS-CDL is a popular language which has the rich syntax to model choreography.But it is much limited for modeling the semantic and adaptability of choreography[16,18]. This paper aimsto show the suitability of such language to specify service choreography. For that, we define therequirements of a typical choreography language on the basis of a number of interaction patterns. Then,the UML state based language is checked out against those patterns to recognize its suitability foraddressing the requirements of service choreography. We also compare this language with other mainlanguages in terms of interaction patterns appeared within a compare ison table.

Azadeh Mellat; Naser Nematbakhsh; Ahmad Farahi; Farhad Mardukhi

2011-01-01

162

Toward a Human-Centered Uml for Risk Analysis  

CERN Multimedia

Safety is now a major concern in many complex systems such as medical robots. A way to control the complexity of such systems is to manage risk. The first and important step of this activity is risk analysis. During risk analysis, two main studies concerning human factors must be integrated: task analysis and human error analysis. This multidisciplinary analysis often leads to a work sharing between several stakeholders who use their own languages and techniques. This often produces consistency errors and understanding difficulties between them. Hence, this paper proposes to treat the risk analysis on the common expression language UML (Unified Modeling Language) and to handle human factors concepts for task analysis and human error analysis based on the features of this language. The approach is applied to the development of a medical robot for teleechography.

Guiochet, J; Baron, C; Boy, G; Guiochet, Jeremie; Motet, Gilles; Baron, Claude; Proxy, Guy Boy; ccsd-00003461, ccsd

2004-01-01

163

Extending UML-RT for Control System Modeling  

Directory of Open Access Journals (Sweden)

Full Text Available There is a growing interest in adopting object technologies for the development of real-time control systems. Several commercial tools, currently available, provide object-oriented modeling and design support for real-time control systems. While these products provide many useful facilities, such as visualization tools and automatic code generation, they are all weak in addressing the central characteristic of real-time control systems design, i.e., providing support for a designer to reason about timeliness properties. We believe an approach that integrates the advancements in both object modeling and design methods and real-time scheduling theory is the key to successful use of object technology for real-time software. Surprisingly several past approaches to integrate the two either restrict the object models, or do not allow sophisticated schedulability analysis techniques. This study shows how schedulability analysis can be integrated with UML for Real-Time (UML-RT) to deal with timing properties in real time control systems. More specifically, we develop the schedulability and feasibility analysis modeling for the external messages that may suffer release jitter due to being dispatched by a tick driven scheduler in real-time control system and we also develop the scheduliablity modeling for sporadic activities, where messages arrive sporadically then execute periodically for some bounded time. This method can be used to cope with timing constraints in realistic and complex real-time control systems. Using this method, a designer can quickly evaluate the impact of various implementation decisions on schedulability. In conjunction with automatic code generation, we believe that this will greatly streamline the design and development of real-time control systems software.

Qimin Gao; L. J. Brown; L. F. Capretz

2004-01-01

164

Binary Phase Diagram Determinations.  

Science.gov (United States)

The potassium chloride-calcium chloride binary phase diagram was generated from both the theoretical and experimental approach in this laboratory. The theoretical technique was based on a computer evaluation of the excess free energies of the components, ...

F. L. Oetting G. P. Martins C. M. Smith

1985-01-01

165

Venn Diagram Shape Sorter  

Science.gov (United States)

This interactive Java applet helps students explore attributes of objects by sorting different sized, colored, shapes into Venn Diagrams. The user chooses the type of Venn Diagram including 2 intersecting circles, 2 non-intersecting circles, or a single circle. Two modes include "make the rule," where users create the rules of the circles and then sort, or "guess the rule," where users attempt to sort the shapes into the circles in order to guess the rule the computer has chosen.

2005-01-01

166

Phase Diagrams in Vivo  

Science.gov (United States)

This activity uses three experiments for students to construct a phase diagram; the experiments have been videotaped and can be seen online. The purpose of this laboratory as designed is to gain familiarity with simple phase diagrams, their construction, and their applications to the understanding of geological and environmental problems. Subsidiary objectives include development of strategies for data processing including evaluation of assumptions and sources of errors, as well as honing of computer, spreadsheet, presentation (tabular and graphical), and report writing skills.

167

Ternary diagram plots  

Energy Technology Data Exchange (ETDEWEB)

A ternary diagram uses an equilateral triangle to graphically depict the relationship among three data values which sum to a constant value. Geologists in many fields use ternary diagrams for a variety of purposes: identification and classification of sedimentary, igneous, and metamorphic rocks; classification of soils; chemical and molecular representation of minerals; representation of the fractional crystallization of igneous rock-forming minerals. Traditionally, constructing a ternary diagram involves calculating the normalized values from the raw data for the three components to be plotted, then plotting the point that represents these values on an equilateral triangle. This can be a tedious and time-consuming process, especially if many samples must be plotted, or many combinations of components represented. Ternary is a program that allows manipulation of large amounts of data to create accurate ternary diagrams. The program allows input of data for hundreds of samples, each containing up to 20 components, any three of which can be combined to form a ternary diagram. Each component can be given a label up to five characters long for ease in identification. Data are entered in raw form (i.e. parts per million, percentages, real or whole numbers), normalized internally to 100, and plotted on a ternary diagram that can be printed to the screen or dot matrix printer.

Scott, A.J.; Guth, P.L.

1987-11-01

168

k-Neighborhood decentralization: a comprehensive solution to index the UMLS for large scale knowledge discovery.  

UK PubMed Central (United Kingdom)

The Unified Medical Language System (UMLS) is the largest thesaurus in the biomedical informatics domain. Previous works have shown that knowledge constructs comprised of transitively-associated UMLS concepts are effective for discovering potentially novel biomedical hypotheses. However, the extremely large size of the UMLS becomes a major challenge for these applications. To address this problem, we designed a k-neighborhood Decentralization Labeling Scheme (kDLS) for the UMLS, and the corresponding method to effectively evaluate the kDLS indexing results. kDLS provides a comprehensive solution for indexing the UMLS for very efficient large scale knowledge discovery. We demonstrated that it is highly effective to use kDLS paths to prioritize disease-gene relations across the whole genome, with extremely high fold-enrichment values. To our knowledge, this is the first indexing scheme capable of supporting efficient large scale knowledge discovery on the UMLS as a whole. Our expectation is that kDLS will become a vital engine for retrieving information and generating hypotheses from the UMLS for future medical informatics applications.

Xiang Y; Lu K; James SL; Borlawsky TB; Huang K; Payne PR

2012-04-01

169

Rule-based support system for multiple UMLS semantic type assignments.  

UK PubMed Central (United Kingdom)

BACKGROUND: When new concepts are inserted into the UMLS, they are assigned one or several semantic types from the UMLS Semantic Network by the UMLS editors. However, not every combination of semantic types is permissible. It was observed that many concepts with rare combinations of semantic types have erroneous semantic type assignments or prohibited combinations of semantic types. The correction of such errors is resource-intensive. OBJECTIVE: We design a computational system to inform UMLS editors as to whether a specific combination of two, three, four, or five semantic types is permissible or prohibited or questionable. METHODS: We identify a set of inclusion and exclusion instructions in the UMLS Semantic Network documentation and derive corresponding rule-categories as well as rule-categories from the UMLS concept content. We then design an algorithm adviseEditor based on these rule-categories. The algorithm specifies rules for an editor how to proceed when considering a tuple (pair, triple, quadruple, quintuple) of semantic types to be assigned to a concept. RESULTS: Eight rule-categories were identified. A Web-based system was developed to implement the adviseEditor algorithm, which returns for an input combination of semantic types whether it is permitted, prohibited or (in a few cases) requires more research. The numbers of semantic type pairs assigned to each rule-category are reported. Interesting examples for each rule-category are illustrated. Cases of semantic type assignments that contradict rules are listed, including recently introduced ones. CONCLUSION: The adviseEditor system implements explicit and implicit knowledge available in the UMLS in a system that informs UMLS editors about the permissibility of a desired combination of semantic types. Using adviseEditor might help accelerate the work of the UMLS editors and prevent erroneous semantic type assignments.

Geller J; He Z; Perl Y; Morrey CP; Xu J

2013-02-01

170

Weyl card diagrams  

International Nuclear Information System (INIS)

To capture important physical properties of a spacetime we construct a new diagram, the card diagram, which accurately draws generalized Weyl spacetimes in arbitrary dimensions by encoding their global spacetime structure, singularities, horizons, and some aspects of causal structure including null infinity. Card diagrams draw only nontrivial directions providing a clearer picture of the geometric features of spacetimes as compared to Penrose diagrams, and can change continuously as a function of the geometric parameters. One of our main results is to describe how Weyl rods are traversable horizons and the entirety of the spacetime can be mapped out. We review Weyl techniques and as examples we systematically discuss properties of a variety of solutions including Kerr-Newman black holes, black rings, expanding bubbles, and recent spacelike-brane solutions. Families of solutions will share qualitatively similar cards. In addition we show how card diagrams not only capture information about a geometry but also its analytic continuations by providing a geometric picture of analytic continuation. Weyl techniques are generalized to higher dimensional charged solutions and applied to generate perturbations of bubble and S-brane solutions by Israel-Khan rods.

2005-06-15

171

UML 2.0 - Overview and Perspectives in SoC Design  

CERN Multimedia

The design productivity gap requires more efficient design methods. Software systems have faced the same challenge and seem to have mastered it with the introduction of more abstract design methods. The UML has become the standard for software systems modeling and thus the foundation of new design methods. Although the UML is defined as a general purpose modeling language, its application to hardware and hardware/software codesign is very limited. In order to successfully apply the UML at these fields, it is essential to understand its capabilities and to map it to a new domain.

Schattkowsky, Tim

2011-01-01

172

Sequence Diagram Test Case Specification and Virtual Integration Analysis using Timed-Arc Petri Nets  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper, we formally define Test Case Sequence Diagrams (TCSD) as an easy-to-use means to specify test cases for components including timing constraints. These test cases are modeled using the UML2 syntax and can be specified by standard UML-modeling-tools. In a component-based design an early identification of errors can be achieved by a virtual integration of components before the actual system is build. We define such a procedure which integrates the individual test cases of the components according to the interconnections of a given architecture and checks if all specified communication sequences are consistent. Therefore, we formally define the transformation of TCSD into timed-arc Petri nets and a process for the combination of these nets. The applicability of our approach is demonstrated on an avionic use case from the ARP4761 standard.

Sven Sieverding; Christian Ellen; Peter Battram

2013-01-01

173

Diblock copolymer phase diagram  

Science.gov (United States)

Adaptation of the Matsen and Bates BCP phase diagram predicted using Mean-field Theory. * Matsen MW, Bates FS, ''http://pubs3.acs.org/acs/journals/doilookup?in_doi=10.1021/ma951138i Unifying weak- and strong-segregation block copolymer theories. Diblock copolymer phase diagram as calculated using Mean-field Theory by Matsen and Bates, where fA is the Block fraction, Ï is the Flory-Huggins Chi Parameter, and N is the length of the block.

Iacovella, Christopher R.

2006-11-20

174

Integrating a Decision Management Tool with UML Modeling Tools  

DEFF Research Database (Denmark)

Numerous design decisions are made while developing software systems, which influence the architecture of these systems as well as following decisions. A number of decision management tools already exist for capturing, documenting, and maintaining design decisions, but also for guiding developers by proposing potential subsequent design issues. In model-based software development, many decisions directly affect the structural and behavioral models used to describe and develop a software system and its architecture. However, these decisions are typically not connected to the models created during the development process. In this report, we propose an integration of a decision management and a UML-based modeling tool, based on use cases we distill from a case study: the modeling tool shall show all decisions related to a model and allow its users to extend or update them; the decision management tool shall trigger the modeling tool to realize design decisions in the models. We define tool-independent concepts and architecture building blocks supporting these use cases and present how they can be implemented in the IBM Rational Software Modeler and Architectural Decision Knowledge Wiki. This seamless integration of formerly disconnected tools improves tool usability as well as decision maker productivity.

Könemann, Patrick

2009-01-01

175

Perfil UML Para el Modelado Visual de Requisitos Difusos  

Directory of Open Access Journals (Sweden)

Full Text Available Modelar dominios de aplicación que involucren requisitos con términos vagos puede ser un proceso complejo,debido a que las herramientas de modelado disponibles en la actualidad no están concebidas para ello. Sin embargo,muchos requisitos de información en sistemas y aplicaciones actuales podrían involucrar términos vagos del lenguajenatural que expresan las preferencias del usuario. Algunos esfuerzos previos se han hecho en el área de consultas abases de datos incorporando la lógica difusa para la expresión de tales preferencias. En este trabajo, se define un perfilbajo UML que permite el modelado visual de requisitos de información basados en términos lingüísticos, ejemplode ellos son los llamados requerimientos fuzzy o difusos. El perfil propuesto se basa en estereotipos y lógica difusaextendida extendido OCL (Object Constraint Language). Dicho perfil posee una semántica formal que permiteeliminar ambigüedades, que puede ser representado gráficamente. Se ejemplifica la aplicación del perfil a través de uncaso de estudio de la vida real que muestra la sencillez y potencialidad de su uso.

Rosseline Rodríguez; Marlene Goncalves

2009-01-01

176

Displaying multimedia environmental partitioning by triangular diagrams  

Energy Technology Data Exchange (ETDEWEB)

It is suggested that equilateral triangular diagrams are a useful method of depicting the equilibrium partitioning of organic chemicals among the three primary environmental media of the atmosphere, the hydrosphere, and the organosphere (natural organic matter and biotic lipids and waxes). The technique is useful for grouping chemicals into classes according to their partitioning tendencies, for depicting the incremental effects of substituents such as alkyl groups and chlorine, and for showing how partitioning changes in response to changes in temperature.

Lee, S.C.; Mackay, D. [Univ. of Toronto, Ontario (Canada). Dept. of Chemical Engineering and Applied Chemistry

1995-11-01

177

Worldline Green functions for multiloop diagrams  

International Nuclear Information System (INIS)

We propose a multiloop generalization of the Bern-Kosower formalism, based on Strassler's approach of evaluating worldline path integrals by worldline Green functions. Those Green functions are explicitly constructed for the basic two-loop graph, and for a loop with an arbitrary number of propagator insertions. For scalar and abelian gauge theories, the resulting integral representations allow to combine whole classes of Feynman diagrams into compact expressions. (orig.)

1994-01-01

178

Making sense to modelers: Presenting UML class model differences in prose  

DEFF Research Database (Denmark)

Understanding the difference between two models, such as different versions of a design, can be difficult. It is a commonly held belief in the model differencing community that the best way of presenting a model difference is by using graph or tree-based visualizations. We disagree and present an alternative approach where sets of low-level model differences are abstracted into high-level model differences that lend themselves to being presented textually. This format is informed by an explorative survey to elicit the change descriptions modelers use themselves. Our approach is validated by a controlled experiment that tests three alternatives to presenting model differences. Our findings support our claim that the approach presented here is superior to EMF Compare.

Störrle, Harald

2013-01-01

179

Evaluation of the UMLS as a terminology and knowledge resource for biomedical informatics.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Objectives: Terminology and knowledge resources are essential components of interoperability among disparate systems. This paper evaluates whether names and relationships needed in biomedical informatics are present in the UMLS. METHODS: Terms for five broad categories of concepts were extracted fro...

Bodenreider, Olivier; Mitchell, Joyce A.; McCray, Alexa T.

180

Performance relationship diagrams  

Energy Technology Data Exchange (ETDEWEB)

By describing a business function's cost drivers and graphically depicting the interrelated cost drivers serving as controls and resources to them, a visual performance model can be provided. A graphical technique, called performance relationship diagraming, has been devised that logically describes these cost drivers and their interrelationships. 2 figs.

Cary, M.J.

1991-11-01

 
 
 
 
181

The System Analysis and Design of Student Management Information Based on UML  

Directory of Open Access Journals (Sweden)

Full Text Available Student management as an important part of university management, and according to the actual situation of the school work, student management information system can not only improve the efficiency of staff and students, but also can be significant savings. In this paper, objectoriented design methods are applied to the software systems. It uses Rose UML modeling to complete the requirement analysis of the student management system, and the functionality and performance analysis.Key words: UML; Student management; Feasibility analysis

Xiaoming DU; Fengjiao FENG

2012-01-01

182

Propuesta para pruebas dirigidas por modelos usando el perfil de pruebas de UML 2.0  

Directory of Open Access Journals (Sweden)

Full Text Available En la actualidad, UML se presenta como uno de los metalenguajes más utilizados para la especificación de sistemas mediante distintos tipos de modelos. Junto con UML 2, OMG ha propuesto un perfil para la realización de pruebas para que éstas puedan ser especificadas no como un artefacto final, sino como modelos que van anotando los modelos UML 2 generad s en el desarrollo. En este artículo se presenta una propuesta para pruebas en el contexto de la Ingeniería dirigida por modelos. A partir de los modelos de diseño del sistema en UML, se propone realizar transformaciones a modelos de prueba basados en el perfil de pruebas de UML. Para que la generación de los casos de prueba sea automática, se define una extensión del metamodelo de UML de forma que se puedan anotar los diagramas de secuencia con información que, luego, pueda ser utilizada para generar el oráculo de pruebas. Esta información es anotada en OCL como pre y postcondiciones en el diagrama.

Beatriz Pérez Lamancha; Pedro Reales Mateo; Ignacio García-Rodríguez de Guzmán; Macario Polo Usaola

2008-01-01

183

El ABP y el diagrama heurístico como herramientas para desarrollar la argumentación escolar en las asignaturas de ciencias/ The PBL and the heuristic diagram as tools for developing school argumentation in science classes  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish En los últimos años se ha reconocido la importancia de la argumentación escolar en las asignaturas de ciencias, siendo el modelo de argumentación de Toulmin uno de los más aceptados. En la presente investigación, enmarcada en el Aprendizaje Basado en Problemas, (ABP) sobre el tema de minerales con alumnos de química del bachillerato mexicano, se introduce una nueva herramienta denominada Diagrama Heurístico que facilita adquirir la competencia argumentativa. Abstract in english In recent years the importance of argumentation in school science has been recognized, the Toulmin model of argumentation being one of the most accepted. In the present investigation, framed by the Problem-Based Learning (PBL) on the theme of minerals with high school chemistry students from Mexico, we introduce a new tool called the Heuristic Diagram that facilitates the acquisition of the argumentative competence.

Pérez Campillo, Yosajandi; Chamizo Guerrero, José Antonio

2013-01-01

184

Configuration space based recurrence relations for sunset-type diagrams  

Energy Technology Data Exchange (ETDEWEB)

We derive recurrence relations for the calculation of multiloop sunset-type diagrams with large powers of massive propagators. The technique is formulated in configuration space and exploits the explicit form of the massive propagator raised to a given power. We write down and evaluate a convenient set of basis integrals. The method is well suited for a numerical evaluation of this class of diagrams. We give explicit analytical formulae for the basis integrals in the asymptotic regime. (orig.)

Groote, S. [Mainz Univ. (Germany). Inst. fuer Physik; Floyd R. Newman Laboratory of Nuclear Studies, Cornell University, Ithaca, NY 14853 (United States); Koerner, J.G. [Mainz Univ. (Germany). Inst. fuer Physik; Pivovarov, A.A. [Mainz Univ. (Germany). Inst. fuer Physik; Institute for Nuclear Research of the Russian Academy of Sciences, 117312 Moscow (Russian Federation)

1999-11-01

185

Configuration space based recurrence relations for sunset-type diagrams  

International Nuclear Information System (INIS)

We derive recurrence relations for the calculation of multiloop sunset-type diagrams with large powers of massive propagators. The technique is formulated in configuration space and exploits the explicit form of the massive propagator raised to a given power. We write down and evaluate a convenient set of basis integrals. The method is well suited for a numerical evaluation of this class of diagrams. We give explicit analytical formulae for the basis integrals in the asymptotic regime. (orig.)

1999-01-01

186

Power diagrams and their applications  

CERN Multimedia

We remark that the power diagrams from computer science are the spines of amoebas in algebraic geometry, or the hypersurfaces in tropical geometry. Our concept of a Morse poset generalizes to power diagrams. We show that there exists a discrete Morse function on the coherent triangulation, dual to the power diagram, such that its critical set equals the Morse poset of the power diagram. In the final section we use Maslov dequantization to compute the medial axis.

van Manen, M; Manen, Martijn van; Siersma, Dirk

2005-01-01

187

Peircean diagrams of time  

DEFF Research Database (Denmark)

Some very good arguments can be given in favor of the Augustinean wisdom, according to which it is impossible to provide a satisfactory definition of the concept of time. However, even in the absence of a proper definition, it is possible to deal with conceptual problems regarding time. It can be done in terms of analogies and metaphors. In particular, it is attractive to make use of Peirce's diagrams by means of which various kinds of conceptual experimentation can be carried out. This paper investigates how Peircean diagrams can be used within the study of time. In particular, we discuss 1) the topological properties of time, 2) the implicative structure in tense logic, 3) the notions of open future and branching time models, and finally 4) tenselogical alternatives to branching time models.

ØhrstrØm, Peter

2011-01-01

188

Homotopy theory of diagrams  

CERN Document Server

In this paper we develop homotopy theoretical methods for studying diagrams. In particular we explain how to construct homotopy colimits and limits in an arbitrary model category. The key concept we introduce is that of a model approximation. Our key result says that if a category admits a model approximation then so does any diagram category with values in this category. From the homotopy theoretical point of view categories with model approximations have similar properties to those of model categories. They admit homotopy categories (localizations with respect to weak equivalences). They also can be used to construct derived functors by taking the analogs of fibrant and cofibrant replacements. A category with weak equivalences can have several useful model approximations. We take advantage of this possibility and in each situation choose one that suits our needs. In this way we prove all the fundamental properties of the homotopy colimit and limit: Fubini Theorem (the homotopy colimit -respectively limit- c...

Chacholski, W; Chacholski, Wojciech; Scherer, Jerome

2001-01-01

189

Control wiring diagrams  

International Nuclear Information System (INIS)

This paper discusses the changes in electrical document requirements that occur when construction is complete and a generating station starts commercial operation. The needs of operations and maintenance (O and M) personnel are analyzed and contrasted with those of construction to illustrate areas in which the construction documents (drawings, diagrams, and databases) are difficult to use for work at an operating station. The paper discusses the O and M electrical documents that the Arizona Nuclear Power Project (ANPP) believes are most beneficial for the three operating units at Palo Verde; these are control wiring diagrams and an associated document cross-reference list. The benefits offered by these new, station O and M-oriented documents are weighted against the cost of their creation and their impact on drawing maintenance.

1989-01-01

190

Compressing Binary Decision Diagrams  

DEFF Research Database (Denmark)

The paper introduces a new technique for compressing Binary Decision Diagrams in those cases where random access is not required. Using this technique, compression and decompression can be done in linear time in the size of the BDD and compression will in many cases reduce the size of the BDD to 1-2 bits per node. Empirical results for our compression technique are presented, including comparisons with previously introduced techniques, showing that the new technique dominate on all tested instances

Hansen, Esben Rune; Satti, Srinivasa Rao

2008-01-01

191

Compressing Binary Decision Diagrams  

CERN Multimedia

The paper introduces a new technique for compressing Binary Decision Diagrams in those cases where random access is not required. Using this technique, compression and decompression can be done in linear time in the size of the BDD and compression will in many cases reduce the size of the BDD to 1-2 bits per node. Empirical results for our compression technique are presented, including comparisons with previously introduced techniques, showing that the new technique dominate on all tested instances.

Hansen, Esben Rune; Tiedemann, Peter

2008-01-01

192

Radiosity with Voronoi Diagrams  

UK PubMed Central (United Kingdom)

Current radiosity methods rely on the calculation of geometric factors, known as formfactors which describe energy exchange between the surfaces of an environment. The most widely used method for storing the illumination across a surface is a mesh of quadrilaterals and/or triangles. For more exact computations these meshes need to be subdivided adaptively. The subdivision methods create artifacts whichhave visible results. A new technique for storing the surface is presented, based on Voronoi diagrams, which are well suited for the task, and can be subdivided without introducing artifacts.

Wolfgang Sturzlinger

193

Towards an UML Profile for Web Service Composition Based on Behavioral Descriptions  

Directory of Open Access Journals (Sweden)

Full Text Available Web service composition is one of the challenging issues that have been investigated over the past decade. It consists of combining and reusing existing Web services to best suit new user requirements. This paper proposes an UML profile to compose Web services based on their behavioral aspects. To do so, the web service WSDL files are first transformed to UML models; then the profile is used to integrate them; finally the MDA approach is adopted to transform the applied profile into a BPEL process. As such, our method has the advantages of being independent of the Web service composition language and the UML modeling tool. Finally, a case study is developed in order to show the benefits of our method.

Ayoub Sabraoui; Ahmed Ettalbi; Mohammed El Koutbi; Abdeslam En-Nouaary

2012-01-01

194

Phase diagrams for surface alloys  

DEFF Research Database (Denmark)

We discuss surface alloy phases and their stability based on surface phase diagrams constructed from the surface energy as a function of the surface composition. We show that in the simplest cases of pseudomorphic overlayers there are four generic classes of systems, characterized by the sign of the heat of segregation from the bulk and the sign of the excess interactions between the atoms in the surface (the surface mixing energy). We also consider the more complicated cases a with ordered surface phases, nonpseudomorphic overlayers, second layer segregation, and multilayers. The discussion is based on density-functional calculations using the coherent-potential approximation and on effective-medium theory. We give self-consistent density-functional results for the segregation energy and surface mixing energy for all combinations of the transition and noble metals. Finally we discuss in detail the cases Ag/Cu(100), Pt/Cu(111), Ag/Pt(111), Co/Cu(111), Fe/Cu(111), and Pd/Cu(110) in connection with available experimental results.

Christensen, AsbjØrn; Ruban, Andrei

1997-01-01

195

Diagrammatic Reasoning with Classes and Relationships  

DEFF Research Database (Denmark)

We present and discuss a diagrammatic visualization and reasoning language coming about by augmenting Euler diagrams with higraphs. The diagrams serve (hierarchical as well as trans-hierarchical) classification and specification of various logical relationships between classes. The diagrams rely on a well-defined underlying class-relationship logic, called CRL, being a fragment of predicate logic. The inference rules at the level of diagrams take form of simple diagrammatic ipso facto rules. The diagrams are intended for computerization by offering navigation and zooming facilities as known from road maps. As such they may facilitate ontological engineering, which often involves larger amounts of data. The underlying inference process is expressible in function-free definite clauses, datalog. We also discuss the relationship to similar diagram and logic proposals.

Nilsson, JØrgen Fischer

2013-01-01

196

On Deformations of Pasting Diagrams  

CERN Multimedia

We adapt the work of Power to describe general, not-necessarily composable, not-necessarily commutative 2-categorical pasting diagrams and their composable and commutative parts. We provide a deformation theory for pasting diagrams valued in $k$-linear categories, paralleling that provided for diagrams of algebras by Gerstenhaber and Schack, proving the standard results. Along the way, the construction gives rise to a bicategorical analog of the homotopy G-algebras of Gerstenhaber and Voronov.

Yetter, D N

2007-01-01

197

Phase diagram of boron nitride  

Energy Technology Data Exchange (ETDEWEB)

The available data on the phase diagram of boron nitride are reviewed with particular reference to experimental results obtained by Wentorf (1961), Bundy and Wentorf (1963), and Corrigan and Bundy (1975). The polymorphic transformations in the system are then examined using newly obtained experimental thermodynamic characteristics. It is shown, in particular, that the low-temperature region of the phase diagram of BN is essentially different from that of the phase diagram of carbon. A new, more accurate phase diagram of BN is presented. 15 references.

Solozhenko, V.L.

1988-01-01

198

Invariances of regularized QED diagrams  

CERN Document Server

We consider properties of connected diagrams with fermion-photon interaction and such fermion and photon propagators and vertex function that the values of these diagrams are finite. We establish the properties of these propagators and vertex function that imply that these diagrams are invariant under C, P, T, CP, CT, PT, or CPT transformations up to some phase factor common to each process. We introduce eight new transformations related to Hermiticity and establish the conditions under which they leave the tree transition probabilities invariant. We determine such general Lorentz form-invariant fermion and photon propagators and fermion-photon vertex functions that make diagrams Lorentz-invariant.

Ribaric, M; Ribaric, Marijan; Sustersic, Luka

2000-01-01

199

Phase diagram of strongly correlated Fermi systems  

International Nuclear Information System (INIS)

Phase transitions in uniform Fermi systems with repulsive forces between the particles caused by restructuring of quasiparticle filling n(p) are analyzed. It is found that in terms of variables, i.e. density ?, nondimensional binding constant ?, phase diagram of a strongly correlated Fermi system for rather a wide class of interactions reminds of a puff-pastry pie. Its upper part is filled with fermion condensate, the lower one - with normal Fermi-liquid. They are separated by a narrow interlayer - the Lifshits phase, characterized by the Fermi multibound surface

2000-01-01

200

Power Diagram Depth Sorting  

UK PubMed Central (United Kingdom)

In this paper we propose a new approach to thedepth sorting problem. Given a simplicial complexGamma in IEd, our approach is based on the preliminaryconstruction of a convex complex Gammain IEd+1,whose projection on IEdcorresponds to Gamma, and onthe representation of Gammaas a power diagram. Thisapproach exhibits a O(m log m) runtime complexityto sort a simplicial complex with m cells andrequires only linear storage.1 IntroductionThe problem of sorting a set of objects in space accordingto their distance from a given viewpoint hasbeen extensively studied in the literature mainlyfor its important applications in computer graphics.We were interested in this problem becauseits relevance in volume visualization; another areawhere the two-dimensional version of this problemarises is visibility computation on terrains [8].Many techniques exist [3] for the direct visualizationof an unstructured volumetric dataset orgainizedas a tetrahaedral comple...

Paolo Cignoni; Leila De Floriani

 
 
 
 
201

Tree Diagrams for String Links II: Determining Chord Diagrams  

CERN Multimedia

In previous work, we defined the intersection graph of a chord diagram associated with a string link (as in the theory of finite type invariants). In this paper, we look at the case when this graph is a tree, and we show that in many cases these trees determine the chord diagram (modulo the usual 1-term and 4-term relations).

Mellor, B

2004-01-01

202

Labeled floor diagrams for plane curves  

CERN Document Server

Floor diagrams are a class of weighted oriented graphs introduced by E. Brugalle and the second author. Tropical geometry arguments lead to combinatorial descriptions of (ordinary and relative) Gromov-Witten invariants of projective spaces in terms of floor diagrams and their generalizations. In a number of cases, these descriptions can be used to obtain explicit (direct or recursive) formulas for the corresponding enumerative invariants. In particular, we use this approach to enumerate rational curves of given degree passing through a collection of points on the complex plane and having maximal tangency to a given line. Another application of the combinatorial approach is a proof of a conjecture by P. Di Francesco -- C. Itzykson and L. Goettsche that in the case of a fixed cogenus, the number of plane curves of degree d passing through suitably many generic points is given by a polynomial in d, assuming that d is sufficiently large. A labeled floor diagram is obtained by labeling the vertices of a floor diag...

Fomin, Sergey

2009-01-01

203

A Language-theoretic View on Guidelines and Consistency Rules of UML  

CERN Multimedia

Guidelines and consistency rules of UML are used to control the degrees of freedom provided by the language to prevent faults. Guidelines are used in specific domains (e.g., avionics) to recommend the proper use of technologies. Consistency rules are used to deal with inconsistencies in models. However, guidelines and consistency rules use informal restrictions on the uses of languages, which makes checking difficult. In this paper, we consider these problems from a language-theoretic view. We propose the formalism of C-Systems, short for "formal language control systems". A C-System consists of a controlled grammar and a controlling grammar. Guidelines and consistency rules are formalized as controlling grammars that control the uses of UML, i.e. the derivations using the grammar of UML. This approach can be implemented as a parser, which can automatically verify the rules on a UML user model in XMI format. A comparison to related work shows our contribution: a generic top-down and syntax-based approach that...

Chen, Zhe

2009-01-01

204

The cohesive metaschema: a higher-level abstraction of the UMLS Semantic Network.  

Science.gov (United States)

The Unified Medical Language System (UMLS) joins together a group of established medical terminologies in a unified knowledge representation framework. Two major resources of the UMLS are its Metathesaurus, containing a large number of concepts, and the Semantic Network (SN), containing semantic types and forming an abstraction of the Metathesaurus. However, the SN itself is large and complex and may still be difficult to view and comprehend. Our structural partitioning technique partitions the SN into structurally uniform sets of semantic types based on the distribution of the relationships within the SN. An enhancement of the structural partition results in cohesive, singly rooted sets of semantic types. Each such set is named after its root which represents the common nature of the group. These sets of semantic types are represented by higher-level components called metasemantic types. A network, called a metaschema, which consists of the meta-semantic types connected by hierarchical and semantic relationships is obtained and provides an abstract view supporting orientation to the SN. The metaschema is utilized to audit the UMLS classifications. We present a set of graphical views of the SN based on the metaschema to help in user orientation to the SN. A study compares the cohesive metaschema to metaschemas derived semantically by UMLS experts. PMID:12669983

Perl, Yehoshua; Chen, Zong; Halper, Michael; Geller, James; Zhang, Li; Peng, Yi

2002-06-01

205

The cohesive metaschema: a higher-level abstraction of the UMLS Semantic Network.  

UK PubMed Central (United Kingdom)

The Unified Medical Language System (UMLS) joins together a group of established medical terminologies in a unified knowledge representation framework. Two major resources of the UMLS are its Metathesaurus, containing a large number of concepts, and the Semantic Network (SN), containing semantic types and forming an abstraction of the Metathesaurus. However, the SN itself is large and complex and may still be difficult to view and comprehend. Our structural partitioning technique partitions the SN into structurally uniform sets of semantic types based on the distribution of the relationships within the SN. An enhancement of the structural partition results in cohesive, singly rooted sets of semantic types. Each such set is named after its root which represents the common nature of the group. These sets of semantic types are represented by higher-level components called metasemantic types. A network, called a metaschema, which consists of the meta-semantic types connected by hierarchical and semantic relationships is obtained and provides an abstract view supporting orientation to the SN. The metaschema is utilized to audit the UMLS classifications. We present a set of graphical views of the SN based on the metaschema to help in user orientation to the SN. A study compares the cohesive metaschema to metaschemas derived semantically by UMLS experts.

Perl Y; Chen Z; Halper M; Geller J; Zhang L; Peng Y

2002-06-01

206

An approach and a tool for test generation and management from UML design  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper presents the Cow_Suite approach for UML-based Integration Testing. Cow_Suite is obtained by the suitable connection of two components: the Cowtest strategy and the UIT methos. Cowtest supports test managers in deciding how many and which tests should be run. UIT is a functional method for...

Basanieri F.; Bertolino A.; Marchetti E.

207

Metodología para la evaluación de la calidad en los modelos UML  

Directory of Open Access Journals (Sweden)

Full Text Available Este artículo presenta una metodología para la evaluación de la calidad de modelos UML, formada por un conjunto estructurado de procesos, orientada a la relación con el cliente y a la externalización de la evaluación de la calidad, y además pensada para ser una metodología fácilmente adaptable.

Moisés Rodríguez; Javier Verdugo; Ramón Coloma; Marcela Genero; Mario Piattini

2010-01-01

208

Specifying Concurrent System Behavior and Timing Constraints Using OCL and UML  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Despite advances in implementation technologies of distributed systems during the last few years, little progress has been made on specification techniques for describing distributed systems in software development practice. The contribution of this paper is a UML-based approach for specifying concu...

Sendall, Shane; Strohmeier, Alfred

209

Implementing a WLAN Video Terminal Using UML and Fully Automated Design Flow  

Directory of Open Access Journals (Sweden)

Full Text Available This case study presents UML-based design and implementation of a wireless video terminal on a multiprocessor system-on-chip (SoC). The terminal comprises video encoder and WLAN communications subsystems. In this paper, we present the UML models used in designing the functionality of the subsystems as well as the architecture of the terminal hardware. We use the Koski design flow and tools for fully automated implementation of the terminal on FPGA. Measurements were performed to evaluate the performance of the FPGA implementation. Currently, fully software encoder achieves the frame rate of 3.0 fps with three 50 MHz processors, which is one half of a reference C implementation. Thus, using UML and design automation reduces the performance, but we argue that this is highly accepted as we gain significant improvement in design efficiency and flexibility. The experiments with the UML-based design flow proved its suitability and competence in designing complex embedded multimedia terminals.

Petri Kukkala; Mikko Setälä; Tero Arpinen; Erno Salminen; Marko Hännikäinen; Timo D. Hämäläinen

2007-01-01

210

Specification and Refinement of Mobile Systems in MTLA and Mobile UML  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We define the spatio-temporal logic MTLA as an extension of Lamport's Temporal Logic of Actions TLA for the specification, verification, and formal development of systems that rely on mobile code. The formalism is validated by an encoding of models written in the Mobile UML notation. We identify ref...

Knapp, Alexander; Merz, Stephan; Wirsing, Martin; Zappe, Julia

211

Tissue transglutaminase levels above 100 U/mL and celiac disease: A prospective study  

Digital Repository Infrastructure Vision for European Research (DRIVER)

AIM: To investigate whether a tissue-transglutaminase antibody (tTGA) level ? 100 U/mL is sufficient for the diagnosis of celiac disease (CD). METHODS: Children suspected of having CD were prospectively included in our study between March 2009 and September 2011. All patients with immune glob...

Amani Mubarak; Victorien M Wolters; Frits HJ Gmelig-Meyling; Fiebo JW ten Kate; Roderick HJ Houwen

212

Contingency diagrams as teaching tools.  

UK PubMed Central (United Kingdom)

Contingency diagrams are particularly effective teaching tools, because they provide a means for students to view the complexities of contingency networks present in natural and laboratory settings while displaying the elementary processes that constitute those networks. This paper sketches recent developments in this visualization technology and illustrates approaches for using contingency diagrams in teaching.

Mattaini MA

1995-01-01

213

Contingency diagrams as teaching tools.  

Science.gov (United States)

Contingency diagrams are particularly effective teaching tools, because they provide a means for students to view the complexities of contingency networks present in natural and laboratory settings while displaying the elementary processes that constitute those networks. This paper sketches recent developments in this visualization technology and illustrates approaches for using contingency diagrams in teaching. PMID:22478208

Mattaini, M A

1995-01-01

214

Tree Diagrams for String Links  

CERN Multimedia

In previous work, the author defined the intersection graph of a chord diagram associated with string links (as in the theory of finite type invariants). In this paper, we classify the trees which can be obtained as intersection graphs of string link diagrams.

Mellor, B

2004-01-01

215

Semantics of Data Flow Diagrams.  

Science.gov (United States)

Ways in which semantics can be attached to data flow diagrams are described. A method for transforming a Data Flow Diagram (DFD) into a petri net which specificies the synchronization aspects of a DFD is presented. A sketch of how a DFD may be transformed...

P. D. Bruza T. P. Vanderweide

1989-01-01

216

On subgroups of R.Thompson's group F and other diagram groups  

CERN Document Server

In this paper, we continue our study of the class of diagram groups. Simply speaking, a diagram is a labelled plane graph bounded by a pair of paths (the top path and the bottom path). To multiply two diagrams, one simply identifies the top path of one diagram with the bottom path of the other diagram, and removes pairs of "reducible" cells. Each diagram group is determined by an alphabet $X$, containing all possible labels of edges, a set of relations ${\\cal R}=\\{u_i=v_i\\mid i=1,2,... \\}$, containing all possible labels of cells, and a word $w$ over $X$ -- the label of the top and bottom paths of diagrams. Diagrams can be considered as 2-dimensional words, and diagram groups can be considered as 2-dimensional analogue of free groups. In our previous paper, we showed that the class of diagram groups contains many interesting groups including the famous R. Thompson group $F$ (it corresponds to the simplest set of relations $\\{x=x^2 \\}$), closed under direct and free products and some other constructions. In th...

Guba, V; Guba, Victor; Sapir, Mark

2000-01-01

217

Modeling multi-typed structurally viewed chemicals with the UMLS Refined Semantic Network.  

UK PubMed Central (United Kingdom)

OBJECTIVE: Chemical concepts assigned multiple "Chemical Viewed Structurally" semantic types (STs) in the Unified Medical Language System (UMLS) are subject to ambiguous interpretation. The multiple assignments may denote the fact that a specific represented chemical (combination) is a conjugate, derived via a chemical reaction of chemicals of the different types, or a complex, composed of a mixture of such chemicals. The previously introduced Refined Semantic Network (RSN) is modified to properly model these varied multi-typed chemical combinations. DESIGN: The RSN was previously introduced as an enhanced abstraction of the UMLS's concepts. It features new types, called intersection semantic types (ISTs), each of which explicitly captures a unique combination of ST assignments in one abstract unit. The ambiguous ISTs of different "Chemical Viewed Structurally" ISTs of the RSN are replaced with two varieties of new types, called conjugate types and complex types, which explicitly denote the nature of the chemical interactions. Additional semantic relationships help further refine that new portion of the RSN rooted at the ST "Chemical Viewed Structurally." MEASUREMENTS: The number of new conjugate and complex types and the amount of changes to the type assignment of chemical concepts are presented. RESULTS: The modified RSN, consisting of 35 types and featuring 22 new conjugate and complex types, is presented. A total of 800 (about 98%) chemical concepts representing multi-typed chemical combinations from "Chemical Viewed Structurally" STs are uniquely assigned one of the new types. An additional benefit is the identification of a number of illegal ISTs and ST assignment errors, some of which are direct violations of exclusion rules defined by the UMLS Semantic Network. CONCLUSION: The modified RSN provides an enhanced abstract view of the UMLS's chemical content. Its array of conjugate and complex types provides a more accurate model of the variety of combinations involving chemicals viewed structurally. This framework will help streamline the process of type assignments for such chemical concepts and improve user orientation to the richness of the chemical content of the UMLS.

Chen L; Morrey CP; Gu H; Halper M; Perl Y

2009-01-01

218

Contribution to the building of an execution engine for UML models for the simulation of competitor and timed applications  

International Nuclear Information System (INIS)

Model Driven Engineering (MDE) places models at the heart of the software engineering process. MDE helps managing the complexity of software systems and improving the quality of the development process. The Model Driven Architecture (MDA) initiative from the Object Management Group (OMG) defines a framework for building design flows in the context of MDE. MDA relies heavily on formalisms which are normalized by the OMG, such as UML for modeling, QVT for model transformations and so on. This work deals with the execution semantics of the UML language applied to embedded real-time applications. In this context, the OMG has a norm which defines an execution model for a subset of UML called fUML (foundational UML subset). This execution model gives a precise semantics to UML models, which can be used for analyzing models, generating code, or verifying transformations. The goal of this PhD thesis is to define and build an execution engine for UML models of embedded real-time systems, which takes into account the explicit hypothesis made by the designer about the execution semantics at a high level of abstraction, in order to be able to execute models as early as possible in the design flow of a system. To achieve this goal, we have extended the fUML execution model along three important axes with regard to embedded real-time systems: - Concurrence: fUML does not provide any mechanism for handling concurrent activities in its execution engine. We address this issue by introducing an explicit scheduler which allows us to control the execution of concurrent tasks. - Time: fUML does not provide any mean to handle time. By adding a clock to the model of execution, we can take into account the elapsed time as well as temporal constraints on the execution of activities. - Profiles: fUML does not take profiles into account, which makes it difficult to personalize the execution engine with new semantic variants. The execution engine we propose allows the use of UML models with profiles, and interprets these profiles as semantic extensions of the execution model. An implementation of these extensions has been realized as an Eclipse plug-in using the Papyrus UML modeling tool. (author)

2012-01-01

219

A generalized Ramanujan Master Theorem applied to the evaluation of Feynman diagrams  

CERN Multimedia

Ramanujan Master Theorem is a technique developed by the indian mathematician S. Ramanujan to evaluate a class of definite integrals. This technique is used here to calculate the values of integrals associated with specific Feynman diagrams.

Gonzalez, Ivan; Schmidt, Ivan

2011-01-01

220

Particles, Feynman Diagrams and All That  

Science.gov (United States)

Quantum fields are introduced in order to give students an accurate qualitative understanding of the origin of Feynman diagrams as representations of particle interactions. Elementary diagrams are combined to produce diagrams representing the main features of the Standard Model.

Daniel, Michael

2006-01-01

 
 
 
 
221

Resummation of cactus diagrams in lattice QCD, to all orders  

International Nuclear Information System (INIS)

We show how to perform a resummation, to all orders in perturbation theory, of a certain class of gauge invariant tadpole-like diagrams in Lattice QCD. These diagrams are often largely responsible for lattice artifacts. Our resummation leads to an improved perturbative expansion. Applied to a number of cases of interest, e.g. the lattice renormalization of some two-fermion operators, this expansion yields results remarkably close to corresponding nonperturbative estimates. We consider in our study both the Wilson and the clover action for fermions.

1999-07-03

222

Phase diagrams of magnetic nanotubes  

Energy Technology Data Exchange (ETDEWEB)

Analytical expressions for the total magnetic energy of two characteristic internal configurations of nanometric tubes are calculated. A magnetic phase diagram with respect to the aspect ratio of the tubes is obtained which allows a discussion about the possibility of getting ensembles of nanotubes with low coercive fields. A comparison with recently reported coercive fields of three different cobalt nanotube arrays agrees well with the phase diagram derived here.

Escrig, J. [Departamento de Fisica, Universidad de Santiago de Chile, USACH, Av. Ecuador 3493, Santiago (Chile); Landeros, P. [Departamento de Fisica, Universidad de Santiago de Chile, USACH, Av. Ecuador 3493, Santiago (Chile); Altbir, D. [Departamento de Fisica, Universidad de Santiago de Chile, USACH, Av. Ecuador 3493, Santiago (Chile); Vogel, E.E. [Departamento de Ciencias Fisicas, Universidad de la Frontera, Casilla 54-D, Temuco (Chile); Vargas, P. [Departamento de Fisica, Universidad Tecnica Federico Santa Maria, Casilla 110-V, Valparaiso (Chile)]. E-mail: patricio.vargas@usm.cl

2007-01-15

223

Phase diagrams of magnetic nanotubes  

International Nuclear Information System (INIS)

Analytical expressions for the total magnetic energy of two characteristic internal configurations of nanometric tubes are calculated. A magnetic phase diagram with respect to the aspect ratio of the tubes is obtained which allows a discussion about the possibility of getting ensembles of nanotubes with low coercive fields. A comparison with recently reported coercive fields of three different cobalt nanotube arrays agrees well with the phase diagram derived here

2007-01-01

224

Phase diagrams of magnetic nanotubes  

Science.gov (United States)

Analytical expressions for the total magnetic energy of two characteristic internal configurations of nanometric tubes are calculated. A magnetic phase diagram with respect to the aspect ratio of the tubes is obtained which allows a discussion about the possibility of getting ensembles of nanotubes with low coercive fields. A comparison with recently reported coercive fields of three different cobalt nanotube arrays agrees well with the phase diagram derived here.

Escrig, J.; Landeros, P.; Altbir, D.; Vogel, E. E.; Vargas, P.

2007-01-01

225

Introduction to Ternary Phase Diagrams  

Science.gov (United States)

This exercise is intended as a group exercise to help students learn the fundamentals of using ternary phase diagrams. It is a much better way for students to learn about the diagrams than to lecture to them. Good students will be able to walk through this with little assistance from the instructor.Weaker students will struggle and need help from peers or instructors. The entire exercise takes 1-2 hours for most.

Perkins, Dexter

226

Phase diagrams of the elements  

International Nuclear Information System (INIS)

A summary of the pressure-temperature phase diagrams of the elements is presented, with graphs of the experimentally determined solid-solid phase boundaries and melting curves. Comments, including theoretical discussion, are provided for each diagram. The crystal structure of each solid phase is identified and discussed. This work is aimed at encouraging further experimental and theoretical research on phase transitions in the elements.

1975-01-01

227

Method for mapping the French CCAM terminology to the UMLS metathesaurus.  

UK PubMed Central (United Kingdom)

The French coding system of surgical procedures, the Classification Commune des Actes Médicaux (CCAM), is used in France for DRG databases and fee for services payment. Mapping between CCAM and other clinical procedures terminologies by the means of UMLS metathesaurus is essential in order to increase semantic interoperability between different healthcare terminologies and between different case mix systems. In a previous work the CISMeF team used an automatic approach to map CCAM descriptors to the French part of the UMLS metathesaurus. In another way for the French funded research project InterSTIS, we performed a mapping using MetaMap based on the top level semantic structure descriptors of anatomy and action of CCAM translated from French to English. This paper aims to present this new approach and to compare the results with the previous one. The combination of both approaches significantly improved the coverage of the mapping to 68 % for both descriptors and 95 % for at least one descriptor.

Bousquet C; Souvignet J; Merabti T; Sadou E; Trombert B; Rodrigues JM

2012-01-01

228

Un método para el refinamiento interactivo del diagrama de clases de UML  

Directory of Open Access Journals (Sweden)

Full Text Available Durante el proceso de elicitación de requisitos se presentan problemas de comunicación entre analistas e interesados que suelen ocasionar pérdidas de requisitos funcionales. Estas pérdidas se aminoran mediante el refinamiento de los esquemas conceptuales, en particular el diagrama de clases de UML. Existen algunos acercamientos al refinamiento del diagrama de clases, pero que no realizan ciclos de interacción con el interesado; otros enfoques realizan refinamiento interactivo del diagrama entidad-relación, un diagrama que no posee toda la información contenida en el diagrama de clases. En este artículo se realiza el refinamiento del diagrama de clases de UML mediante la interacción con el interesado. Para ello, se proponen reglas de completitud que se disparan en lenguaje natural y se emplea un corpus de diagramas de clases para complementar el conocimiento del analista en un determinado dominio. El análisis de completitud propuesto se ilustra con un prototipo en la herramienta UNCDiagramador y se ejemplifica con un caso de estudio

CARLOS M. ZAPATA; BETSY MARY ESTRADA; FERNANDO ARANGO I

2007-01-01

229

UMLS content views appropriate for NLP processing of the biomedical literature vs. clinical text.  

Science.gov (United States)

Identification of medical terms in free text is a first step in such Natural Language Processing (NLP) tasks as automatic indexing of biomedical literature and extraction of patients' problem lists from the text of clinical notes. Many tools developed to perform these tasks use biomedical knowledge encoded in the Unified Medical Language System (UMLS) Metathesaurus. We continue our exploration of automatic approaches to creation of subsets (UMLS content views) which can support NLP processing of either the biomedical literature or clinical text. We found that suppression of highly ambiguous terms in the conservative AutoFilter content view can partially replace manual filtering for literature applications, and suppression of two character mappings in the same content view achieves 89.5% precision at 78.6% recall for clinical applications. PMID:20152935

Demner-Fushman, Dina; Mork, James G; Shooshan, Sonya E; Aronson, Alan R

2010-02-10

230

UMLS content views appropriate for NLP processing of the biomedical literature vs. clinical text.  

UK PubMed Central (United Kingdom)

Identification of medical terms in free text is a first step in such Natural Language Processing (NLP) tasks as automatic indexing of biomedical literature and extraction of patients' problem lists from the text of clinical notes. Many tools developed to perform these tasks use biomedical knowledge encoded in the Unified Medical Language System (UMLS) Metathesaurus. We continue our exploration of automatic approaches to creation of subsets (UMLS content views) which can support NLP processing of either the biomedical literature or clinical text. We found that suppression of highly ambiguous terms in the conservative AutoFilter content view can partially replace manual filtering for literature applications, and suppression of two character mappings in the same content view achieves 89.5% precision at 78.6% recall for clinical applications.

Demner-Fushman D; Mork JG; Shooshan SE; Aronson AR

2010-08-01

231

Refinamiento del diagrama de clases UML a Oracle®9I en ATOM3  

Directory of Open Access Journals (Sweden)

Full Text Available El OMG define el refinamiento como el proceso de transformación desde un modelo independiente de la plataforma de implementación hacia un modelo específico de la plataforma de implementación. Las herramientas CASE convencionales han experimentado problemas con este tipo de transformación, debido a la definición estática de los modelos incluidos en ellas, a las dificultades para la definición de reglas de transformación y al pobre rendimiento mostrado por ellas en la obtención de código. Las herramientas MetaCASE han surgido con nuevas capacidades para mejorar el refinamiento en el contexto de la transformación entre modelos. En este artículo se presenta una implementación en AToM3 para refinamiento que transforma un diagrama de clases UML independiente de la plataforma de implementación a un diagrama de clases UML dependiente de la plataforma de implementación Oracle® 9i. Además, se muestra el uso de esta clase de refinamiento con un caso de estudio.

CARLOS M. ZAPATA; CARLOS A. ÁLVAREZ; FERNANDO ARANGO I.

2007-01-01

232

UML-based testcase- and system model for railway process control- and safety engineering; UML-basierte Testfall- und Systemmodelle fuer die Eisenbahnleit- und -sicherungstechnik  

Energy Technology Data Exchange (ETDEWEB)

The continuous introduction of more sophisticated and more complex automation systems is of high relevance for operations- and control devices for railway applications. One example of this trend is the European Train Control System (ETCS). I is harmonized for all European member states and currently deployed for commercial use on selected lines. Applications like ETCS take responsibility for passengers, environment and the rolling stock material. For this reason, the development of those applications is characterized by high demands on testing, documentation and quality assurance. Unfortunately, real projects have proven to achieve these high demands only with tremendous efforts as long as they stick to their traditional development processes and methods. Therefore, a wide spread exploration for new concepts regarding planning, implementation and - most of all - testing of safety relevant systems is under its way. This thesis contributes to the search for new design methods for such systems. It combines recent achievements in the environment of the Unified Modeling Language (UML) to an integrated approach for a consistent testcase- and system description in a single UML model. The model comprises the UML profiles SysML (System Modeling Language) and U2TP (UML 2 Testing Profile), which are officially specified and released by the Object Management Group (OMG). This thesis shows how based on these two profiles - a single, combined system- and testcase model can be build - relationships between requirements, implementation- and testcase can be established - requirement relationships can be evaluated automatically to ensure model consistency and to determine implementation and testcase coverage - C++-code can be generated directly from the model - TTCN-3-code (Testing and Test Control Notation, Version 3) can be derived automatically from the model - a toolchain can be set up which supports all mentioned functions. In order to prove the feasibility of this approach, a case study has been performed which shows how a component of the railway laboratory RailSiTe {sup registered} (Rail Simulation and Testing) of the German Aerospace Center has been described using a combined testcase- and system model. Apart from the case study and from the theoretical basics of combined UML models, this thesis deals with surrounding aspects of the modeling method. This includes comparisons with other means of description or embedding object-oriented modeling in traditional development processes. The overall result is that both the approach and the toolchain are working properly and can be applied in real world projects. The anticipated advantages like re-usage of model items, more efficient testing, more formal system descriptions and avoidance of discontinuous notations in the whole process appeared in the theoretical derivation as well as in the practical usage of the method. So there is reason to believe that this approach will find future applications outside its scientific origin. (orig.)

Knollmann, V.

2007-12-15

233

Alignment of the UMLS semantic network with BioTop: methodology and assessment.  

UK PubMed Central (United Kingdom)

MOTIVATION: For many years, the Unified Medical Language System (UMLS) semantic network (SN) has been used as an upper-level semantic framework for the categorization of terms from terminological resources in biomedicine. BioTop has recently been developed as an upper-level ontology for the biomedical domain. In contrast to the SN, it is founded upon strict ontological principles, using OWL DL as a formal representation language, which has become standard in the semantic Web. In order to make logic-based reasoning available for the resources annotated or categorized with the SN, a mapping ontology was developed aligning the SN with BioTop. METHODS: The theoretical foundations and the practical realization of the alignment are being described, with a focus on the design decisions taken, the problems encountered and the adaptations of BioTop that became necessary. For evaluation purposes, UMLS concept pairs obtained from MEDLINE abstracts by a named entity recognition system were tested for possible semantic relationships. Furthermore, all semantic-type combinations that occur in the UMLS Metathesaurus were checked for satisfiability. RESULTS: The effort-intensive alignment process required major design changes and enhancements of BioTop and brought up several design errors that could be fixed. A comparison between a human curator and the ontology yielded only a low agreement. Ontology reasoning was also used to successfully identify 133 inconsistent semantic-type combinations. AVAILABILITY: BioTop, the OWL DL representation of the UMLS SN, and the mapping ontology are available at http://www.purl.org/biotop/.

Schulz S; Beisswanger E; van den Hoek L; Bodenreider O; van Mulligen EM

2009-06-01

234

Relating UMLS semantic types and task-based ontology to computer-interpretable clinical practice guidelines.  

UK PubMed Central (United Kingdom)

Medical knowledge in clinical practice guideline (GL) texts is the source of task-based computer-interpretable clinical guideline models (CIGMs). We have used Unified Medical Language System (UMLS) semantic types (STs) to understand the percentage of GL text which belongs to a particular ST. We also use UMLS semantic network together with the CIGM-specific ontology to derive a semantic meaning behind the GL text. In order to achieve this objective, we took nine GL texts from the National Guideline Clearinghouse (NGC) and marked up the text dealing with a particular ST. The STs we took into consideration were restricted taking into account the requirements of a task-based CIGM. We used DARPA Agent Markup Language and Ontology Inference Layer (DAML + OIL) to create the UMLS and CIGM specific semantic network. For the latter, as a bench test, we used the 1999 WHO-International Society of Hypertension Guidelines for the Management of Hypertension. We took into consideration the UMLS STs closest to the clinical tasks. The percentage of the GL text dealing with the ST "Health Care Activity" and subtypes "Laboratory Procedure", "Diagnostic Procedure" and "Therapeutic or Preventive Procedure" were measured. The parts of text belonging to other STs or comments were separated. A mapping of terms belonging to other STs was done to the STs under "HCA" for representation in DAML + OIL. As a result, we found that the three STs under "HCA" were the predominant STs present in the GL text. In cases where the terms of related STs existed, they were mapped into one of the three STs. The DAML + OIL representation was able to describe the hierarchy in task-based CIGMs. To conclude, we understood that the three STs could be used to represent the semantic network of the task-bases CIGMs. We identified some mapping operators which could be used for the mapping of other STs into these.

Kumar A; Ciccarese P; Quaglini S; Stefanelli M; Caffi E; Boiocchi L

2003-01-01

235

A study of terminology auditors' performance for UMLS semantic type assignments.  

UK PubMed Central (United Kingdom)

Auditing healthcare terminologies for errors requires human experts. In this paper, we present a study of the performance of auditors looking for errors in the semantic type assignments of complex UMLS concepts. In this study, concepts are considered complex whenever they are assigned combinations of semantic types. Past research has shown that complex concepts have a higher likelihood of errors. The results of this study indicate that individual auditors are not reliable when auditing such concepts and their performance is low, according to various metrics. These results confirm the outcomes of an earlier pilot study. They imply that to achieve an acceptable level of reliability and performance, when auditing such concepts of the UMLS, several auditors need to be assigned the same task. A mechanism is then needed to combine the possibly differing opinions of the different auditors into a final determination. In the current study, in contrast to our previous work, we used a majority mechanism for this purpose. For a sample of 232 complex UMLS concepts, the majority opinion was found reliable and its performance for accuracy, recall, precision and the F-measure was found statistically significantly higher than the average performance of individual auditors.

Gu HH; Elhanan G; Perl Y; Hripcsak G; Cimino JJ; Xu J; Chen Y; Geller J; Paul Morrey C

2012-12-01

236

ATTACK DESCRIPTION LANGUAGE FOR COLLABORATED ALERTS-USING XML AND UML  

Directory of Open Access Journals (Sweden)

Full Text Available Statistics of Internet usage are increasing enormously. In harmony, the attacks are also escalating. In the recent era, IDS have gained more popularity in connection to network security. IDS deployed in the network will scan the hosts and the network. It will try to sense misuse detection or anomaly detection. Whenever there is any suspicious activity, IDS will immediately raise alarm. It would be apt to capture the complete description of the new attack as soon as alarm rises. This information to be collected may be heterogeneous because it may be from multiple users, process or hosts. Hence there is a need for common standard language that will work across various domains and platforms. XML is one such language.Writing an XML schema directly would be difficult and inconvenient. The best way to write XML schemas is to useUML models. Hence in this paper, we propose alert collbaration modeling architecture and attack description language using XML notion, which uses UML modeling. Keywords- IDS; Attack description; XML;UML

K.V.S.N. Rama Rao

2011-01-01

237

ATTACK DESCRIPTION LANGUAGE FOR COLLABORATED ALERTS-USING XML AND UML  

Directory of Open Access Journals (Sweden)

Full Text Available Statistics of Internet usage are increasing enormously. In harmony, the attacks are also escalating. In the recent era, IDS have gained more popularity in connection to network security. IDS deployed in the network will scan the hosts and the network. It will try to sense misuse detection or anomaly detection. Whenever there is any suspicious activity, IDS will immediately raise alarm. It would be apt to capture the complete description of the new attack as soon as alarm rises. This information to be collected may be heterogeneous because it may be from multiple users, process or hosts. Hence there is a need for common standard language that will work across various domains and platforms. XML is one such language.Writing an XML schema directly would be difficult and inconvenient. The best way to write XML schemas is to useUML models. Hence in this paper, we propose alert collbaration modeling architecture and attack description language using XML notion, which uses UML modeling. Keywords- IDS,Attack,description,XML,UML

K.V.S.N. Rama Rao

2011-01-01

238

Magnetic Phase Diagram of Weakly Pinned Type-II Superconductors  

CERN Document Server

The phenomenon of superconductivity was discovered in 1911, however, the methodology to classify and distinguish type-II superconductivity was established only in late fifties after Abrikosov's prediction of a flux line lattice in 1957. The advent of high temperature superconductors (HTSC) in 1986 focused attention onto identifying and classifying other possible phases of vortex matter in all classes of superconductors by a variety of techniques. We have collated evidences in support of a proposal to construct a generic phase diagram for weakly pinned superconducting systems, based on their responses to ac and dc magnetic fields. The phase diagram comprises quasi-glassy phases, like, the Bragg glass, a vortex glass and a reentrant glass in addition to the (completely) amorphous phases of pinned and unpinned variety. of techniques. We have collated evidences in support of a proposal to construct a generic phase diagram for weakly pinned superconducting systems, based on their responses to ac and dc magnetic fi...

Banerjee, S

1999-01-01

239

Transformación del modelo de clases uml a oracle9i® bajo la directiva mda: un caso de estudio  

Directory of Open Access Journals (Sweden)

Full Text Available La Arquitectura Orientada a Modelos (MDA) es la propuesta de refinamiento de la OMG orientada a la generación automática de código a partir de los Modelos UML de Sistemas Independientes de la Plataforma de Implementación. En este trabajo se presenta una metodología para transformar el Modelo de Clases UML a un Modelo UML Dependiente de la Plataforma Oracle9i®, siguiendo los lineamientos básicos presentados por esta arquitectura y utilizando a UML como lenguaje de modelado a través de todos los pasos de dicha transformación. Inicialmente las reglas de transformación del Modelo de Clases de UML al Modelo Objeto-Relacional soportado por Oracle9i® son recopiladas en Español y adaptadas a nivel de metamodelo, para lo cual fue necesario elaborar un metamodelo simplificado de la plataforma Oracle9i®. Este conjunto de reglas se hace automatizable al expresarlas en un formalismo lógico, que sea fácilmente ejecutable por una herramienta CASE que soporte un lenguaje formal. Finalmente, se aplican las reglas de refinamiento formalizadas al Modelo de Clases de un Caso Práctico de estudio obteniendo como resultado, un Modelo UML instancia del Metamodelo de la Plataforma Oracle9i®. Los aspectos del Modelo de Clases en los que se hace énfasis en la transformación son las invariantes y reglas de derivación de atributos definidas en el lenguaje formal OCL, así como las relaciones de asociación, composición y generalización entre Clases.

FERNANDO ARANGO; MARÍA CLARA GÓMEZ; CARLOS M. ZAPATA

2006-01-01

240

Diagrams for laser materials processing  

Science.gov (United States)

An analytical heat flow model is used to identify dimensionless parameter groups which determine the temperature field produced in a material by a scanning laser beam. The groups are used to plot experimental data for metallic alloys on a processing diagram for a range of continuous CO2 laser treatments. Practical operating regions for each type of treatment are thus identified, which coincide with those predicted using the heat flow model. The model is extended in order to construct more detailed diagrams for transformation hardening, surface melting and keyhole welding, which quantify the depth of treatment. By using realistic estimates of certain poorly-known process variables, good agreement is observed between measured and predicted data. Methods for optimizing processing parameters with respect to various criteria are presented for transformation hardening. The diagrams, which are constructed on a personal computer, are a useful tool for summarizing current data, optimizing practical processing parameters, and assessing the potential of novel laser treatments on new materials.

Ion, J. C.; Shercliff, H. R.; Ashby, M. F.

1992-07-01

 
 
 
 
241

The Lexis diagram, a misnomer  

Directory of Open Access Journals (Sweden)

Full Text Available Around 1870, demographers felt the need for a simple chart to present population dynamics. This chart is known as the Lexis diagram, but it is a misnomer. To be useful, this chart must allow for the systematic location on one plane of the three classical demographic co-ordinates, namely: the date, the age and the moment of birth. There are three solutions for this problem. In 1869, Zeuner worked out a first solution. In 1870, Brasche proposed a second one with networks of parallels; it is the version most currently used now. In 1874, Becker proposed the third one. In 1875, certainly after Verwey, Lexis took back the Zeuner's diagram and just added networks of parallels. In spite of all this, the name "Lexis diagram" has imposed itself in a seemingly invincible way.

Vandeschrick Christophe

2001-01-01

242

Topologically distinct Feynman diagrams for mass operator in electron-phonon interaction  

Directory of Open Access Journals (Sweden)

Full Text Available The new method for designing topologically distinct Feynman diagrams for electron's mass operator in electron-phonon interaction is developed using the permutation group theory. The carried out classification of DPs allows to choose the classes, corresponding to disconnected diagrams, to singly connected diagrams, direct ("tadpole") diagrams, to diagrams corresponding to phonon Green functions. After this classification the set of considered double permutations is reduced to one class since only these are relevant to mass operator. We derive analytical expressions which allow to identify the DP, and to choose the phonon components, which are not accepted in every type. To avoid repetition of asymmetric diagrams, which correspond to the same analytical expression, we introduce the procedure of inversion in phonon component, and identify symmetric as well as a pair of asymmetric phonon components. For every type of DP (denoted by its digital encoding), taking into account its symmetry, we perform a set of transformations on this DP, list all DPs of the type and all the corresponding Feynman diagrams of mass operator automatically. It is clear that no more expressions (diagrams) for the relevant order of perturbation theory for mass operator can be designed.

C.C. Tovstyuk

2009-01-01

243

Transformations of triangle ladder diagrams  

CERN Multimedia

It is shown how dual space diagrammatic representation of momentum integrals corresponding to triangle ladder diagrams with an arbitrary number of rungs can be transformed to half-diamonds. Acting in the way described in this paper we do not need to use diamond (four-point) diagrams as an intermediate step in deriving relations of arXiv:0803.3420 [hep-th]. In that paper the half-diamonds were related by conformal integral substitution to the diamonds. As is known, the diamonds represent the dual space image of four-point ladder integrals in the four-dimensional momentum space.

Kondrashuk, Igor

2009-01-01

244

Grid diagrams and Khovanov homology  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We explain how to compute the Jones polynomial of a link from one of its grid diagrams and we observe a connection between Bigelow’s homological definition of the Jones polynomial and Kauffman’s definition of the Jones polynomial. Consequently, we prove that the Maslov grading on the Seidel–Smith sy...

Droz, J-M; Wagner, E

245

Electrical elementary diagrams and operators  

Energy Technology Data Exchange (ETDEWEB)

After 40 years of reading and interrupting electrical elementary logic drawings, I have concluded that we need to make a change. We need to write and express our nuclear power plant logic in some other language than relay ladder logic, solid state logic or computer mnemonics. The language should be English, or your native language, and the format should be Descriptive Block Diagrams. (author)

Patterson, B.K. [Human Factors Practical Inc., Dipper Harbour, New Brunswick (Canada)]. E-mail: HumanFactors@netscape.ca

2005-07-01

246

The diagram for phyllotactic series  

Directory of Open Access Journals (Sweden)

Full Text Available Many authors studying phyllotaxis in various plant species have reported the occurrence of many different numbers of contact parastichy pairs that are members of different Fibonacci-like series. On the basis of these reports a diagram was constructed in which any theoretically possible series was represented by the two first members of a given series.

Joanna Szymanowska-Pu?ka; Wies?aw W?och

1997-01-01

247

Phase diagrams of mesomorphic mixtures  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We have combined the Maier Saupe theory [1] of the nematic-isotropic transition and the Flory Huggins theory of mixtures to describe the phase diagrams of two nematogens A + B. The two components can have different order parameters SA, SB in the mixture. We can then predict the morphology of the pha...

Brochard, F.; Jouffroy, J.; Levinson, P.

248

Communicating systems with UML 2 modeling and analysis of network protocols  

CERN Document Server

This book gives a practical approach to modeling and analyzing communication protocols using UML 2. Network protocols are always presented with a point of view focusing on partial mechanisms and starting models. This book aims at giving the basis needed for anybody to model and validate their own protocols. It follows a practical approach and gives many examples for the description and analysis of well known basic network mechanisms for protocols.The book firstly shows how to describe and validate the main protocol issues (such as synchronization problems, client-server interactions, layer

Barrera, David Garduno

2013-01-01

249

A UMLS-based spell checker for natural language processing in vaccine safety  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background The Institute of Medicine has identified patient safety as a key goal for health care in the United States. Detecting vaccine adverse events is an important public health activity that contributes to patient safety. Reports about adverse events following immunization (AEFI) from surveillance systems contain free-text components that can be analyzed using natural language processing. To extract Unified Medical Language System (UMLS) concepts from free text and classify AEFI reports based on concepts they contain, we first needed to clean the text by expanding abbreviations and shortcuts and correcting spelling errors. Our objective in this paper was to create a UMLS-based spelling error correction tool as a first step in the natural language processing (NLP) pipeline for AEFI reports. Methods We developed spell checking algorithms using open source tools. We used de-identified AEFI surveillance reports to create free-text data sets for analysis. After expansion of abbreviated clinical terms and shortcuts, we performed spelling correction in four steps: (1) error detection, (2) word list generation, (3) word list disambiguation and (4) error correction. We then measured the performance of the resulting spell checker by comparing it to manual correction. Results We used 12,056 words to train the spell checker and tested its performance on 8,131 words. During testing, sensitivity, specificity, and positive predictive value (PPV) for the spell checker were 74% (95% CI: 74–75), 100% (95% CI: 100–100), and 47% (95% CI: 46%–48%), respectively. Conclusion We created a prototype spell checker that can be used to process AEFI reports. We used the UMLS Specialist Lexicon as the primary source of dictionary terms and the WordNet lexicon as a secondary source. We used the UMLS as a domain-specific source of dictionary terms to compare potentially misspelled words in the corpus. The prototype sensitivity was comparable to currently available tools, but the specificity was much superior. The slow processing speed may be improved by trimming it down to the most useful component algorithms. Other investigators may find the methods we developed useful for cleaning text using lexicons specific to their area of interest.

Tolentino Herman D; Matters Michael D; Walop Wikke; Law Barbara; Tong Wesley; Liu Fang; Fontelo Paul; Kohl Katrin; Payne Daniel C

2007-01-01

250

Generation of powder compaction response diagrams  

Energy Technology Data Exchange (ETDEWEB)

The effect of elastic compliances in the testing system is shown to have a considerable influence on the compaction diagram generated via an automatic procedure. Proper accounting of this effect allows rapid and accurate diagrams to be made.

Matsumoto, R.L.K.

1986-10-01

251

The Intersection Graph Conjecture for Loop Diagrams  

CERN Multimedia

Vassiliev invariants can be studied by studying the spaces of chord diagrams associated with singular knots. To these chord diagrams are associated the intersection graphs of the chords. We extend results of Chmutov, Duzhin and Lando to show that these graphs determine the chord diagram if the graph has at most one loop. We also compute the size of the subalgebra generated by these "loop diagrams."

Mellor, B

2000-01-01

252

T-P phase diagram for ice  

International Nuclear Information System (INIS)

In this study we obtain a T-P phase diagram of ice using the mean field theory. We fit our calculated phase line equations to the experimental T-P phase diagram. By choosing appropriately the coefficients in the free-energy expansions, our calculated phase diagram agrees well with the experimentally observed phase diagram of ice. Some thermodynamic functions are calculated using the free energy for the transitions studied here.

2008-01-01

253

Phase diagrams of binary tantalum alloys  

International Nuclear Information System (INIS)

[en] The details of phase diagrams, crystal structures and thermodynamic data of tantalum and all its binary systems are presented in this monograph. Phase diagram illustrations of 52 systems are presented. The complete binary phase diagrams of tantalum with each of the rare earth elements have been presented in detail for the first time. These diagrams have been calculated using a sub-regular solution model

1996-01-01

254

Psi-floor diagrams and a Caporaso-Harris type recursion  

CERN Multimedia

Floor diagrams are combinatorial objects which organize the count of tropical plane curves satisfying point conditions. In this paper we introduce Psi-floor diagrams which count tropical curves satisfying not only point conditions but also conditions given by Psi-classes (together with points). We then generalize our definition to relative Psi-floor diagrams and prove a Caporaso-Harris type formula for the corresponding numbers. This formula is shown to coincide with the classical Caporaso-Harris formula for relative plane descendant Gromov-Witten invariants. As a consequence, we can conclude that in our case relative descendant Gromov-Witten invariants equal their tropical counterparts.

Block, Florian; Markwig, Hannah

2010-01-01

255

Hero's journey in bifurcation diagram  

Science.gov (United States)

The hero's journey is a narrative structure identified by several authors in comparative studies on folklore and mythology. This storytelling template presents the stages of inner metamorphosis undergone by the protagonist after being called to an adventure. In a simplified version, this journey is divided into three acts separated by two crucial moments. Here we propose a discrete-time dynamical system for representing the protagonist's evolution. The suffering along the journey is taken as the control parameter of this system. The bifurcation diagram exhibits stationary, periodic and chaotic behaviors. In this diagram, there are transition from fixed point to chaos and transition from limit cycle to fixed point. We found that the values of the control parameter corresponding to these two transitions are in quantitative agreement with the two critical moments of the three-act hero's journey identified in 10 movies appearing in the list of the 200 worldwide highest-grossing films.

Monteiro, L. H. A.; Mustaro, P. N.

2012-06-01

256

Method for mapping the French CCAM terminology to the UMLS metathesaurus.  

Science.gov (United States)

The French coding system of surgical procedures, the Classification Commune des Actes Médicaux (CCAM), is used in France for DRG databases and fee for services payment. Mapping between CCAM and other clinical procedures terminologies by the means of UMLS metathesaurus is essential in order to increase semantic interoperability between different healthcare terminologies and between different case mix systems. In a previous work the CISMeF team used an automatic approach to map CCAM descriptors to the French part of the UMLS metathesaurus. In another way for the French funded research project InterSTIS, we performed a mapping using MetaMap based on the top level semantic structure descriptors of anatomy and action of CCAM translated from French to English. This paper aims to present this new approach and to compare the results with the previous one. The combination of both approaches significantly improved the coverage of the mapping to 68 % for both descriptors and 95 % for at least one descriptor. PMID:22874173

Bousquet, Cédric; Souvignet, Julien; Merabti, Tayeb; Sadou, Eric; Trombert, Béatrice; Rodrigues, Jean-Marie

2012-01-01

257

Meta-Model and UML Profile for Requirements Management of Software and Embedded Systems  

Directory of Open Access Journals (Sweden)

Full Text Available Software and embedded system companies today encounter problems related to requirements management tool integration, incorrect tool usage, and lack of traceability. This is due to utilized tools with no clear meta-model and semantics to communicate requirements between different stakeholders. This paper presents a comprehensive meta-model for requirements management. The focus is on software and embedded system domains. The goal is to define generic requirements management domain concepts and abstract interfaces between requirements management and system development. This leads to a portable requirements management meta-model which can be adapted with various system modeling languages. The created meta-model is prototyped by translating it into a UML profile. The profile is imported into a UML tool which is used for rapid evaluation of meta-model concepts in practice. The developed profile is associated with a proof of concept report generator tool that automatically produces up-to-date documentation from the models in form of web pages. The profile is adopted to create an example model of embedded system requirement specification which is built with the profile.

Arpinen Tero; Hämäläinen TimoD; Hännikäinen Marko

2011-01-01

258

Un ambiente para la obtencion automatica de diagramas uml a partir de un lenguaje controlado  

Directory of Open Access Journals (Sweden)

Full Text Available El apoyo suministrado por las herramientas convencionales de la Ingeniería de Software a los analistas se ha basado en ayudas para el trazado y edición de modelos, siendo exiguo el apoyo ofrecido a la concepción misma del modelo. Existe actualmente una tendencia hacia la generación automática de esquemas conceptuales y, si bien se han realizado grandes avances, se ha trabajado con pocos diagramas y subsisten algunos inconvenientes relacionados especialmente con la consistencia de los diagramas obtenidos. En este artículo se propone un ambiente para la obtención automática de algunos de los diagramas de UML 2.0, conformado por un lenguaje controlado (UNLencep), un mecanismo para la representación del conocimiento (los denominados Esquemas Preconceptuales) y un sistema de reglas para la traducción del lenguaje controlado a un conjunto de diagramas equivalentes de UML; este ambiente se implementó en la herramienta CASE UNC-Diagramador, en la cual se presenta adicionalmente un caso de estudio. Con esta implementación se apoya la labor de conceptualización de los modelos por parte de los analistas y se mejora la consistencia, puesto que los modelos resultantes se elaboran a partir del mismo texto en lenguaje controlado

CARLOS M. ZAPATA; FERNANDO ARANGO I

2007-01-01

259

T-X Phase Diagrams  

Science.gov (United States)

This is a 15 page tutorial and problem set designed to get students familiar with T-X diagrams, their implications, and uses. Students start by reading but, after 10-15 minutes, the room becomes noisy as they work their way through the questions at the end. Often there are "Eureka" moments as they all of a sudden grasp some fundamental principles. It is also interesting to hear them try to explain these insights to others.

Perkins, Dexter

260

Causal diagrams in systems epidemiology  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Methods of diagrammatic modelling have been greatly developed in the past two decades. Outside the context of infectious diseases, systematic use of diagrams in epidemiology has been mainly confined to the analysis of a single link: that between a disease outcome and its proximal determinant(s). Transmitted causes ("causes of causes") tend not to be systematically analysed. The infectious disease epidemiology modelling tradition models the human population in its environment, typically with the exposure-health relationship and the determinants of exposure being considered at individual and group/ecological levels, respectively. Some properties of the resulting systems are quite general, and are seen in unrelated contexts such as biochemical pathways. Confining analysis to a single link misses the opportunity to discover such properties. The structure of a causal diagram is derived from knowledge about how the world works, as well as from statistical evidence. A single diagram can be used to characterise a whole research area, not just a single analysis - although this depends on the degree of consistency of the causal relationships between different populations - and can therefore be used to integrate multiple datasets. Additional advantages of system-wide models include: the use of instrumental variables - now emerging as an important technique in epidemiology in the context of mendelian randomisation, but under-used in the exploitation of "natural experiments"; the explicit use of change models, which have advantages with respect to inferring causation; and in the detection and elucidation of feedback.

Joffe Michael; Gambhir Manoj; Chadeau-Hyam Marc; Vineis Paolo

2012-01-01

 
 
 
 
261

Tiling groupoids and Bratteli diagrams  

CERN Multimedia

Let T be an aperiodic and repetitive tiling of R^d with finite local complexity. Let O be its tiling space with canonical transversal X. The tiling equivalence relation R_X is the set of pairs of tilings in X which are translates of each others, with a certain (etale) topology. In this paper R_X is reconstructed as a generalized "tail equivalence" on a Bratteli diagram, with its standard AF-relation as a subequivalence relation. Using a generalization of the Anderson-Putnam complex, O is identified with the inverse limit of a sequence of finite CW-complexes. A Bratteli diagram B is built from this sequence, and its set of infinite paths dB is homeomorphic to X. The diagram B is endowed with a horizontal structure: additional edges that encode the adjacencies of patches in T. This allows to define an etale equivalence relation R_B on dB which is homeomorphic to R_X, and contains the AF-relation of "tail equivalence".

Bellissard, J; Savinien, J

2009-01-01

262

EFFICIENT TRANSFORMATION OF USE CASE MAIN SUCCESS SCENARIO STEPS INTO BUSSINESS OBJECT RELATION (BORM) DIAGRAMS FOR EFFECTIVE BUSSINESS PROCESS REQUIREMENT ANALYSIS  

Directory of Open Access Journals (Sweden)

Full Text Available The basic part of an innovative and modern approach to business processrequirement analysis which is based on the simultaneous utilization of UML Use Caseapproach and the Business Object Relation Modelling approach is analyzed in thepresent paper. Precisely the transition rules by which the Use Case Main SuccessScenario steps are converted into to a BORM diagram, entitled as the Use Case ToBORM Transformation Algorithm (UCBTA) transition rules, are presented as apattern based method which leads to the effective and efficient business processrequirement analysis

ATHANASIOS PODARAS; JOSEF MORAVEC; MARTIN PAPIK

2012-01-01

263

The phase diagram of the quark-meson model  

International Nuclear Information System (INIS)

Within the proper-time renormalization group approach, the chiral phase diagram of a two-flavor quark-meson model is studied. In the chiral limit, the location of the tricritical point which is linked to a Gaussian fixed point, is determined. For quark chemical potentials smaller than the tricritical one the second-order phase transition belongs to the O(4) universality class. For temperatures below the tricritical one we find initially a weak first-order phase transition which is commonly seen in model studies and also in recent lattice simulations. In addition, below temperatures of T-bar 17 MeV we find two phase transitions. The chiral restoration transition is initially also of first-order but turns into a second-order transition again. This leads to the possibility that there may be a 'second tricritical' point in the QCD phase diagram in the chiral limit.

2005-08-22

264

On the shape phase fields and position of titanium alloys on classification diagram  

International Nuclear Information System (INIS)

[en] The static substantiation of the titanium alloys area boundaries of various classes on the classification diagram is carried out. It is shown, that aluminium by high contents in the titanium alloys may produce certain ?-stabilizing effect. The titanium alloys, alloyed with copper, should be related to the ?-alloys. The boundaries between the ?-, pseudo-?-, (?+?)-, pseudo-?-alloys, as well as the transition class are clarified. The classification diagram may useful by comparing the titanium alloys by the phase composition, mechanical properties level and by evaluating their ability to thermal hardening[ru] ????????? ??????????? ??????????? ?????? ???????? ????????? ??????? ????????? ??????? ?? ????????????????? ?????????. ????????, ??? ??? ??????? ??????????? ? ??????? ?????? ???????? ????? ????????? ????????? ?-??????????????? ????????. ?????? ??????, ???????????? ?????, ??????? ???????? ? ?-???????. ???????? ??????? ????? ?-, ??????-?-, (?+?)-, ??????-?-????????, ? ????? ???????? ??????????? ??????. ????????????????? ????????? ????? ???? ???????? ??? ????????????? ????????? ??????? ?? ???????? ???????, ?????? ???????????? ??????? ? ??? ?????? ?? ??????????? ? ???????????? ??????????

2002-01-01

265

Phase diagrams of ferroelastic ditellurates  

International Nuclear Information System (INIS)

Formation peculiarities of domain structure of ferroelectric ditellurites are considered. To study the effect of different factors on the formation of the domain structure the phase diagram of solid solutions in systems CaxCd1-xTe2O5 and SrxCd1-xTe2O5, where x=0-1, has been investigated. In the studied crystals of the two systems a correlation between the formation of domain structure and the presence of real or hypothetic phase transition is observed

1989-01-01

266

A Trajectory UML profile For Modeling Trajectory Data: A Mobile Hospital Use Case  

CERN Document Server

A large amount of data resulting from trajectories of moving objects activities are collected thanks to localization based services and some associated automated processes. Trajectories data can be used either for transactional and analysis purposes in various domains (heath care, commerce, environment, etc.). For this reason, modeling trajectory data at the conceptual level is an important stair leading to global vision and successful implementations. However, current modeling tools fail to fulfill specific moving objects activities requirements. In this paper, we propose a new profile based on UML in order to enhance the conceptual modeling of trajectory data related to mobile objects by new stereotypes and icons. As illustration, we present a mobile hospital use case.

Oueslati, Wided

2011-01-01

267

Surgery diagrams for contact 3-manifolds  

CERN Multimedia

In two previous papers, the two first-named authors introduced a notion of contact r-surgery along Legendrian knots in contact 3-manifolds. They also showed how (at least in principle) to convert any contact r-surgery into a sequence of contact plus or minus 1 surgeries, and used this to prove that any (closed) contact 3-manifold can be obtained from the standard contact structure on the 3-sphere by a sequence of such surgeries. In the present paper, we give a shorter proof of that result and a more explicit algorithm for turning a contact r-surgery into plus or minus 1 surgeries. We use this to give explicit surgery diagrams for all contact structures on the 3-sphere and S^1\\times S^2, as well as all overtwisted contact structures on arbitrary closed, orientable 3-manifolds. This amounts to a new proof of the Lutz-Martinet theorem that each homotopy class of 2-plane fields on such a manifold is represented by a contact structure.

Ding, F; Stipsicz, A I; Ding, Fan; Geiges, Hansj\\"org; Stipsicz, Andr\\'as I.

2003-01-01

268

Potts models on Feynman diagrams  

International Nuclear Information System (INIS)

We investigate numerically and analytically Potts models on 'thin' random same concgeneric Feynman diagrams, using the idea that such models may be expressed as the N?1 limit of a matrix model. The thin random graphs in this limit are locally tree-like, in distinction to the 'fat' random graphs that appear in the planar Feynman diagram limit, N??, more familiar from discretized models of two-dimensional gravity. The interest of the thin graphs is that they give mean-field theory behaviour for spin models living on them without infinite range interactions or the boundary problems of genuine tree-like structures such as the Bethe lattice. q-state Potts models display a first-order transition in the mean field for q>2, so the thin-graph Potts models provide a useful test case for exploring discontinuous transitions in mean-field theories in which many quantities can be calculated explicitly in the saddle-point approximation. Such discontinuous transitions also appear in multiple Ising models on thin graphs and may have implications for the use of the replica trick in spin-glass models on random graphs. (author)

1997-11-07

269

Phase Diagrams for Sonoluminescing Bubbles  

CERN Multimedia

Sound driven gas bubbles in water can emit light pulses. This phenomenon is called sonoluminescence (SL). Two different phases of single bubble SL have been proposed: diffusively stable and diffusively unstable SL. We present phase diagrams in the gas concentration vs forcing pressure state space and also in the ambient radius vs gas concentration and vs forcing pressure state spaces. These phase diagrams are based on the thresholds for energy focusing in the bubble and two kinds of instabilities, namely (i) shape instabilities and (ii) diffusive instabilities. Stable SL only occurs in a tiny parameter window of large forcing pressure amplitude $P_a \\sim 1.2 - 1.5$atm and low gas concentration of less than $0.4\\%$ of the saturation. The upper concentration threshold becomes smaller with increasing forcing. Our results quantitatively agree with experimental results of Putterman's UCLA group on argon, but not on air. However, air bubbles and other gas mixtures can also successfully be treated in this approach i...

Hilgenfeldt, S; Brenner, M; Hilgenfeldt, Sascha; Lohse, Detlef; Brenner, Michael

1996-01-01

270

Phase diagrams for high Tc superconductors  

International Nuclear Information System (INIS)

The phase diagrams of ternary and quaternary systems containing superconducting phases are presented, as are the phase diagrams of the associated binary systems. The diagrams are divided into two large groups: (1) alkaline earth-rare earth-copper-oxygen diagrams, and (2) alkaline earth-bismuth/lead-copper-oxygen diagrams. The first group includes BaO-REO-CuO systems followed by SrO-REO-CuO or Nd2O3-CeO-CuO systems. The second group includes systems related to the AE-Bi2O3-CuO and AE-PbO-CuO systems. The phase diagrams are accompanied by notes relating procedures used in the studies, results obtained, and comparisons with the results in the literature for the same system.

1991-01-01

271

An UML Approach to Overcome Issues of Concurrency in Distributed Systems  

Directory of Open Access Journals (Sweden)

Full Text Available A Distributed System is a collection of Independent Computers that appears to its Users’ as a single entity or Single System. These Independent Systems collaborate together to achieve a common goal. They communicate with each other via a network. Concurrency is one common characteristic of Distributed Systems. They help in achieving parallelism. There are issues of Concurrency in Distributed Systems. The main intention of this research is to uncover the issues of Distributed Systems in its design phase so that the cost incurred in the later stages for detecting and rectifying those issues can be reduced.  This paper discusses the issues of concurrency in Distributed System and proposes a model that overcomes the issues. Generally Distributed Systems are modeled using Deployment Diagrams but in this paper we discuss the drawbacks of using Deployment diagram in showing concurrency in Distributed System and we provide a model using the Object Diagrams that overcomes the listed Drawbacks.

Om Kumar; Peyakunta Bhargavi Reddy

2013-01-01

272

Some interesting color-magnitude diagrams  

Science.gov (United States)

Some CCD color-magnitude diagrams for a few open clusters, global clusters, and dwarf spheroidal galaxies in the Local Group are presented. Consideration is given to the open clusters NGC 7789, NGC 2818, NGC 6205, and NGC 6341, the spheroidal galaxy in Draco, the B, R color-magnitude diagram of Carina, and the B, R color-magnitude diagram for the dwarf spheroidal galaxy in Fornax.

Stetson, Peter B.

1997-07-01

273

Solving Hybrid Influence Diagrams with Deterministic Variables  

CERN Multimedia

We describe a framework and an algorithm for solving hybrid influence diagrams with discrete, continuous, and deterministic chance variables, and discrete and continuous decision variables. A continuous chance variable in an influence diagram is said to be deterministic if its conditional distributions have zero variances. The solution algorithm is an extension of Shenoy's fusion algorithm for discrete influence diagrams. We describe an extended Shenoy-Shafer architecture for propagation of discrete, continuous, and utility potentials in hybrid influence diagrams that include deterministic chance variables. The algorithm and framework are illustrated by solving two small examples.

Li, Yijing

2012-01-01

274

A new method for the calculation of massive multiloop diagrams  

CERN Multimedia

Starting from the parametric representation of a Feynman diagram, we obtain it's well defined value in dimensional regularisation by changing the integrals over parameters into contour integrals. That way we eventually arrive at a representation consisting of well-defined compact integrals. The result is a simple transformation of the integrand which gives the analytic continuation of a wide class of Feynmanintegrals. The algorithm will especially be fit for numerical calculation of general massive multi-loop integrals. An important advantage of this method is that it allows us to calculate both infinite and finite parts independently.

Knecht, K

1997-01-01

275

Merging Object and Process Diagrams for Business Information Modeling  

CERN Multimedia

While developing an information system for the University of Bern, we were faced with two major issues: managing software changes and adapting Business Information Models. Software techniques well-suited to software development teams exist, yet the models obtained are often too complex for the business user. We will first highlight the conceptual problems encountered while designing the Business Information Model. We will then propose merging class diagrams and business process modeling to achieve a necessary transparency. We will finally present a modeling tool we developed which, using pilot case studies, helps to show some of the advantages of a dual model approach.

Chénais, Patrick

2008-01-01

276

Hubble's diagram and cosmic expansion.  

UK PubMed Central (United Kingdom)

Edwin Hubble's classic article on the expanding universe appeared in PNAS in 1929 [Hubble, E. P. (1929) Proc. Natl. Acad. Sci. USA 15, 168-173]. The chief result, that a galaxy's distance is proportional to its redshift, is so well known and so deeply embedded into the language of astronomy through the Hubble diagram, the Hubble constant, Hubble's Law, and the Hubble time, that the article itself is rarely referenced. Even though Hubble's distances have a large systematic error, Hubble's velocities come chiefly from Vesto Melvin Slipher, and the interpretation in terms of the de Sitter effect is out of the mainstream of modern cosmology, this article opened the way to investigation of the expanding, evolving, and accelerating universe that engages today's burgeoning field of cosmology.

Kirshner RP

2004-01-01

277

Mapping Scheme of Traditional Iranian Medicine Cluster’s Crotch in the Structure of Metathesaurus of Unified Medical Language System (UMLS)  

Directory of Open Access Journals (Sweden)

Full Text Available Background & Aim: Unified Medical Language System (UMLS) is an extensive ontology of biomedical knowledge developed and maintained by U.S. National Library of Medicine (NLM). Traditional Iranian Medicine (TIM) does not have any position in the structure of metathesaurus of UMLS. The main aim of this study was designing a scheme of TIM cluster's crotch mapping in the structure of metathesaurus of UMLS. Moreover, the TIM position and its proportion in the domain of vocabulary and concepts of universal medical knowledge was another aim of this study.Materials and Methods: System analysis was the method of this study. To investigate structure of UMLS metathesaurus, and to survey lacking of TIM cluster's crotch, we applied UMLS Knowledge Source (KS) by using inductive, deductive, inductive-deductive approaches.Results: One Concept Unique Identifier (CUI); two synonym terms with Lexical Unique Identifier (LUI), L0025131 and L6330122; two ancestor and parent concept; nine concepts which with TIM crotch were the child concepts of two ancestor and parent; eighteen sibling concepts; six narrower; and five other related found concepts were identified for the proposal TIM crotch mapping in metathesaurus of UMLS. In addition, we found the "Biomedical Occupation or Discipline" semantic type assigned to it.Conclusions: Current domain of metathesaurus of UMLS does not represent complete and formal domain and position of TIM. Therefore, this metathesaurus needs to depict a domain and position for TIM.

A Valinejadi; F Azadeh; A Horri; MR Shams Ardekani; M Amirhosseini

2008-01-01

278

Phase diagrams of random Ising models : simple and systematic successive approximations  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We present a simple and systematic method to calculate phase diagrams of random Ising models. It applies to a wide class of systems in which, however, randomness has to be described by discrete random variables. We calculated, at different orders of approximation, various quantities like critical te...

Benyoussef, A.; Boccara, N.

279

Stemming diagram user's guide  

Energy Technology Data Exchange (ETDEWEB)

STEM is an interactive program that writes a MAPPER file to produce a representation of a stemming diagram. Stemming diagrams are used as part of the presentation by containment scientists to the Containment Evaluation Panel at the Nevada Operations Office. 2 figs.

Noel, S.D.

1986-04-01

280

How to calculate one-loop diagrams  

International Nuclear Information System (INIS)

A numerical method to estimate the Feynman integrals for one-loop diagram with on-shell internal particles is described in terms of an antithetic cancellation technique using an adaptive Monte Carlo integration. This method enable the authors to estimate necessary integrals of loop diagrams for physical processes without analytic calculation.

1989-01-01

 
 
 
 
281

Phase diagrams and diffuse neutron scattering  

International Nuclear Information System (INIS)

Order and segregation, which rule numerous phase diagrams, result from interaction potentials between components of alloys. These potentials can be obtained, without adjustable parameters, by electronic structure calculations. The experiments of diffuse diffusion presented here allow us to determine the potentials from in-situ measurement of short-distance order, and to compare them with theoretical evaluations and reconstruct the phase diagrams

1989-01-20

282

CERPHASE: Computer-generated phase diagrams  

International Nuclear Information System (INIS)

CERPHASE is a collection of computer programs written in the programming language basic and developed for the purpose of teaching the principles of phase diagram generation from the ideal solution model of thermodynamics. Two approaches are used in the generation of the phase diagrams: freezing point depression and minimization of the free energy of mixing. Binary and ternary phase diagrams can be generated as can diagrams containing the ideal solution parameters used to generate the actual phase diagrams. Since the diagrams generated utilize the ideal solution model, data input required from the operator is minimal: only the heat of fusion and melting point of each component. CERPHASE is menu-driven and user-friendly, containing simple instructions in the form of screen prompts as well as a HELP file to guide the operator. A second purpose of CERPHASE is in the prediction of phase diagrams in systems for which no experimentally determined phase diagrams are available, enabling the estimation of suitable firing or sintering temperatures for otherwise unknown systems. Since CERPHASE utilizes ideal solution theory, there are certain limitations imposed on the types of systems that can be predicted reliably. 6 refs., 13 refs

1990-01-01

283

Calculation of Binary Eutectic Phase Diagrams.  

Science.gov (United States)

The phase diagrams of 65 simple binary eutectic phase diagrams are calculated from the properties of the elemental constituents. The liquid phase is assumed to behave as an ideal solution and the terminal solid solution regions were assumed to be ideal an...

J. E. Davison

1969-01-01

284

Operations space diagram for ECRH and ECCD  

DEFF Research Database (Denmark)

A Clemmov-Mullaly-Allis (CMA) type diagram, the ECW-CMA diagram, for representing the operational possibilities of electron cyclotron heating and current drive (ECRH/ECCD) systems for fusion plasmas is presented. In this diagram, with normalized density and normalized magnetic field coordinates, the parameter range in which it is possible to achieve a given task (e.g. O-mode current drive for stabilizing a neoclassical tearing mode) appears as a region. With also the Greenwald density limit shown, this diagram condenses the information on operational possibilities, facilitating the overview required at the design phase. At the operations phase it may also prove useful in setting up experimental scenarios by showing operational possibilities, avoiding the need for survey type ray-tracing at the initial planning stages. The diagram may also serve the purpose of communicating operational possibilities to non-experts. JET and ITER like plasmas are used, but the method is generic.

Bindslev, H.

2004-01-01

285

Persistence Diagrams and the Heat Equation Homotopy  

CERN Document Server

Persistence homology is a tool used to measure topological features that are present in data sets and functions. Persistence pairs births and deaths of these features as we iterate through the sublevel sets of the data or function of interest. I am concerned with using persistence to characterize the difference between two functions f, g : M -> R, where M is a topological space. Furthermore, I formulate a homotopy from g to f by applying the heat equation to the difference function g-f. By stacking the persistence diagrams associated with this homotopy, we create a vineyard of curves that connect the points in the diagram for f with the points in the diagram for g. I look at the diagrams where M is a square, a sphere, a torus, and a Klein bottle. Looking at these four topologies, we notice trends (and differences) as the persistence diagrams change with respect to time.

Fasy, Brittany Terese

2010-01-01

286

Influence diagram method for containment performance analysis  

Energy Technology Data Exchange (ETDEWEB)

Influence diagram method has been applied to containment performance analysis of Younggwang 3 and 4 in an effort to explicitly display the dependencies among events. This study has been initiated to remove two major drawbacks of the current event tree methodology: 1) Event tree cannot express dependency between events explicitly. 2) Accident Progression Event Tree (APET) cannot represent entire containment system. To resolve these problems, a new approach, i.e., influence diagrams, are proposed. In the present work, the applicability of the influence diagrams have been demonstrated for YGN 3 and 4 containment performance analysis and assessment of accident management strategies. The results of this study are in good agreement with those of YGN 3 and 4 IPE. In addition, influence diagrams are used to assess two accident management strategies: 1) RCS depressurization, 2) Cavity flooding. It is shown that influence diagrams can be applied to the containment performance analysis.

Park, J. W.; Jae, M. S.; Chun, M. H. [Korea Atomic Energy Research Institute, Taejon (Korea, Republic of)

1995-07-01

287

Influence diagram method for containment performance analysis  

International Nuclear Information System (INIS)

Influence diagram method has been applied to containment performance analysis of Younggwang 3 and 4 in an effort to explicitly display the dependencies among events. This study has been initiated to remove two major drawbacks of the current event tree methodology: 1) Event tree cannot express dependency between events explicitly. 2) Accident Progression Event Tree (APET) cannot represent entire containment system. To resolve these problems, a new approach, i.e., influence diagrams, are proposed. In the present work, the applicability of the influence diagrams have been demonstrated for YGN 3 and 4 containment performance analysis and assessment of accident management strategies. The results of this study are in good agreement with those of YGN 3 and 4 IPE. In addition, influence diagrams are used to assess two accident management strategies: 1) RCS depressurization, 2) Cavity flooding. It is shown that influence diagrams can be applied to the containment performance analysis

1995-01-01

288

A generic conceptual and UML model for the multi-echelon distribution supply chain  

Directory of Open Access Journals (Sweden)

Full Text Available The Multi-Echelon Distribution Supply Chain (MEDSC) is a multifaceted structure, focusing on the integration of all factors that involved in the overall distribution process of finished products to thecustomers. The growing interest in multi-echelon distribution systems has highlighted the need to adopt an appropriate approach to ensure the efficient management of their complexity. While there is asignificant amount of analytical research modeling the MEDSC, few studies have used simulation models for this system. The objective of the paper is to model the operational level of the MEDSC network and to obtain a real reflection of its behavior. The permanent interaction among the various components of the MEDSC and the increasing complexity of such system requires a simulation model, which is able to integrate a set of dynamic characteristics and stochastic aspects. Furthermore, this model will be adapted to several configurations of the multi-echelon network. Thus, this research has twofold: first to recall the issues regarding the flow management and inventory control in the MEDSC, then using the objectoriented approach through the Unified Modeling Language (UML) to build a flexible supply chain model.

Hamid Ech-Cheikh; Saâd Lissane Elhaq; Abdessamad Douraid

2012-01-01

289

Applying UML to the Development of Medical Care Process Management Systemfor Nursing Home Residents  

Directory of Open Access Journals (Sweden)

Full Text Available Taiwan has been recognized by World Health Organization (WHO) as an “elderly” country in 1993 since its elderly (65 or older) population ratio was over 7%. Due to the physiological and psychological degeneration, the elderly always has a higher possibility of suffering from chronic diseases. Chronic patients, including the elderly suffering from chronic diseases, have burdened their families with the long-term medical-care need. Until recently, the emergence of nursing homes has successfully alleviated the heavy burden on chronic patients’ families. A nursing home provides various professional medical-care services to its residents (i.e., patients of the nursing home) by doctors, nursing specialists, nurses, rehabilitation doctors, social workers, and occupational therapists. Each resident is indeed a unique case to a nursing home. As a result, the medical-care process management has become one of the most important factors for improving the medical care quality of a nursing home. This research took the Chang-Gung Nursing Home as an example and applied Unified Modeling Language (UML) to analyze corresponding medical care processes. A medical care process management system was developed and implemented for the Chang-Gung Nursing Home.

Yeh-Chun Juan; Cherng-Min Ma; Huang-Mu Chen

2005-01-01

290

UNC - Diagramador una herramienta upper CASE para la obtención de diagramas UML desde esquemas preconceptuales  

Directory of Open Access Journals (Sweden)

Full Text Available Las herramientas CASE han tenido tradicionalmente un enfoque hacia actividades relativas a las fases fi nales del ciclo de vida del software, como la generación de código, por ejemplo. Por ello, este tipo de herramientas, denominadas Lower CASE, han podido apoyar muy someramente a los analistas en procesos como la generación de esquemas conceptuales a partir de lenguaje natural. Para esta tarea, han venido surgiendo herramientas CASE enfocadas a las fases iniciales del ciclo de vida del software (conocidas como Upper CASE). Sin embargo, estas herramientas aún presentan inconvenientes: la mayoría de ellas se enfocan en un solo diagrama y las que generan varios diagramas emplean diferentes representaciones intermedias para llegar ellos, lo que puede ocasionar problemas de consistencia en los diagramas resultantes. En este artículo se muestra el desarrollo de UNC-Diagramador, una herramienta del tipo Upper CASE para la generación de diagramas de UML 2.0 desde los denominados Esquemas Preconceptuales, con la cual se trata de solucionar las limitaciones presentadas. El uso de UNC-Diagramador se ejemplifi ca con un caso de estudio.

Carlos M. Zapata J.; Fernán A. Villa; Luz M. Ruiz C.

2007-01-01

291

Extending the UML metamodel to grant prop up for crosscutting concerns  

Directory of Open Access Journals (Sweden)

Full Text Available Aspect-orientation is an idiom used to describeapproaches that unambiguously capture, model and implementcrosscutting concerns (or aspects). There is presently a quantityof new encoding languages as well as extensions to currentencoding languages, the blueprint scope of mainly of which havebeen predisposed by the AspectJ language through threeconcepts and their relevant constructs, namely join points,pointcuts and counsel which can prop up two principlesrecognized as being key concepts of aspect-orientedprogramming (AOP): quantification and obliviousness. At thedesign level, the response of AOP has stretched been focused onthe designing of AspectJ programs, and there exists no designthat is nonspecific enough to incarcerate non-AspectJ aspectseither as a source language during forward engineering or as atarget language during reverse engineering.As a solution, we present an extension to the UMLmetamodel to clearly incarcerate crosscutting concerns. Themodel is sovereign from any encoding language and vague awayfrom platform specific details. An instantiation of the newlycreated metamodel can be represented in usual XMI format,which enables current CASE tools to read and to envisage theoccasion models in UML. This language-independent aspectualdepiction can maintain design transformations critical tosoftware development and support, such as forward engineering,reverse engineering, and reengineering.

Veluru Gowri

2012-01-01

292

Tailoring online information retrieval to user's needs based on a logical semantic approach to natural language processing and UMLS mapping.  

Science.gov (United States)

Depression can derail teenagers' lives and cause serious chronic health problems. Acquiring pertinent knowledge and skills supports care management, but retrieving appropriate information can be difficult. This poster presents a strategy to tailor online information to user attributes using a logical semantic approach to natural language processing (NLP) and mapping propositions to UMLS terms. This approach capitalizes on existing NLM resources and presents a potentially sustainable plan for meeting consumers and providers information needs. PMID:18694113

Kossman, Susan; Jones, Josette; Brennan, Patricia Flatley

2007-10-11

293

Graphical tool for navigation within the semantic network of the UMLS metathesaurus on a locally installed database.  

UK PubMed Central (United Kingdom)

Knowledge in the environment of information technologies is bound to structured vocabularies. Medical data dictionaries are necessary for uniquely describing findings like diagnoses, procedures or functions. Therefore we decided to locally install a version of the Unified Medical Language System (UMLS) of the U.S. National Library of Medicine as a repository for defining entries of a medical multimedia database. Because of the requirement to extend the vocabulary in concepts and relations between existing concepts a graphical tool for appending new items to the database has been developed: Although the database is an instance of a semantic network the focus on single entries offers the opportunity of reducing the net to a tree within this detail. Based on the graph theorem, there are definitions of nodes of concepts and nodes of knowledge. The UMLS additionally offers the specification of sub-relations, which can be represented, too. Using this view it is possible to manage these 1:n-Relations in a simple tree view. On this background an explorer like graphical user interface has been realised to add new concepts and define new relationships between those and existing entries for adapting the UMLS for specific purposes such as describing medical multimedia objects.

Frankewitsch T; Prokosch HU

2000-01-01

294

Breviz: Visualizing Spreadsheets using Dataflow Diagrams  

CERN Multimedia

Spreadsheets are used extensively in industry, often for business critical purposes. In previous work we have analyzed the information needs of spreadsheet professionals and addressed their need for support with the transition of a spreadsheet to a colleague with the generation of data flow diagrams. In this paper we describe the application of these data flow diagrams for the purpose of understanding a spreadsheet with three example cases. We furthermore suggest an additional application of the data flow diagrams: the assessment of the quality of the spreadsheet's design.

Hermans, Felienne; van Deursen, Arie

2011-01-01

295

Diagrams and Descriptions in Acquiring Complex Systems  

UK PubMed Central (United Kingdom)

Complex systems such as a car brake, circulatory system,or legislative system can be conveyed by language ordiagrams. Such systems can be presented from structuralor functional perspectives. In three experiments, weexamine communicating structure and function ofmechanical systems (bike pump, car brake, pulleysystem) by text and diagrams in relation to mechanicalability. By adding arrows, structural diagrams can beenriched to convey functional information. Inferringstructure from function was easier than inferring functionfrom structure. Participants high in mechanical abilityoutperformed low participants except when textperspective matched question perspective. Those withlow mechanical ability are at a disadvantage, especiallyfor inferring function from diagrams. Comprehension ofcomplex systems depends in sensible ways onperspective, medium, and ability.

Julie Heiser; Barbara Tversky

296

From Twistor Actions to MHV Diagrams  

CERN Multimedia

We show that MHV diagrams are the Feynman diagrams of certain twistor actions for gauge theories in an axial gauge. The gauge symmetry of the twistor action is larger than that on space-time and this allows us to fix a gauge that makes the MHV formalism manifest but which is inaccessible from space-time. The framework is extended to describe matter fields: as an illustration we explicitly construct twistor actions for an adjoint scalar with arbitrary polynomial potential and a fermion in the fundamental representation and show how this leads to additional towers of MHV vertices in the MHV diagram formalism.

Boels, Rutger; Skinner, David; 10.1016/j.physletb.2007.02.058

2008-01-01

297

From twistor actions to MHV diagrams  

International Nuclear Information System (INIS)

We show that MHV diagrams are the Feynman diagrams of certain twistor actions for gauge theories in an axial gauge. The gauge symmetry of the twistor action is larger than that on space-time and this allows us to fix a gauge that makes the MHV formalism manifest but which is inaccessible from space-time. The framework is extended to describe matter fields: as an illustration we explicitly construct twistor actions for an adjoint scalar with arbitrary polynomial potential and a fermion in the fundamental representation and show how this leads to additional towers of MHV vertices in the MHV diagram formalism.

2007-04-26

298

A study on bifurcation diagrams in relation to synchronisation in chaotic systems  

CERN Multimedia

We numerically study some of the 3-D dynamical systems which exhibit complete synchronisation as well as generalised synchronisation (GS) to show that these systems can be conveniently partitioned into equivalent classes facilitating the study of bifurcation diagrams (BDs) within each class. We demonstrate how BDs may be helpful in assessing the robustness of GS and in predicting the nature of the driven system by knowing the BD of driving system and vice versa. We extend the study to include the possible GS between elements of two different equivalent classes by taking the example of the Rossler-driven-Lorenz-system.

Chakraborty, S; Dutta, Debabrata

2006-01-01

299

Diagram method in research on coadjoint orbits  

CERN Document Server

We correspond to any factor algebra of the unitriangular Lie algebra with respect to a regular ideal some permutation. In terms of this permutation one can construct a diagram, that allows to calculate index and maximal dimension of coadjoint representation.

Panov, A N

2009-01-01

300

Handle moves in contact surgery diagrams  

CERN Document Server

We describe various handle moves in contact surgery diagrams, notably contact analogues of the Kirby moves. As an application of these handle moves, we discuss the respective classifications of long and loose Legendrian knots.

Ding, Fan

2008-01-01

 
 
 
 
301

Architecture flow diagrams under teamwork reg sign  

Energy Technology Data Exchange (ETDEWEB)

The Teamwork CASE tool allows Data Flow Diagrams (DFDs) to be maintained for structured analysis. Fermilab has extended teamwork under UNIX{trademark} to permit Hatley and Pirbhai Architecture Flow Diagrams (AFDs) to be associated with DFDs and subsequently maintained. This extension, called TWKAFD, allows a user to open an AFD, graphically edit it, and replace it into a TWKAFD maintained library. Other aspects of Hatley and Pirbhai's methodology are supported. This paper presents a quick tutorial on Architecture Diagrams. It then describes the user's view of TWKAFD, the experience incorporating it into teamwork, and the successes with using the Architecture Diagram methodology along with the shortcomings of using the teamwork/TWKAFD tool. 8 refs.

Nicinski, T.

1992-02-01

302

Phase Diagram Information for Processing of Superconductors.  

Science.gov (United States)

Composition of various superconducting compounds with potentially high critical temperature (greater than 20K) is discussed. Phase diagrams of Nb--Al--Ge, Nb--Sn--Cu, and Nb--Ge--Cu are given. (ERA citation 02:054781)

D. Dew-Hughes

1977-01-01

303

Extended Influence Diagrams for System Quality Analysis  

Directory of Open Access Journals (Sweden)

Full Text Available Making major changes in enterprise information systems, such as large IT-investments, often have a significant impact on business operations. Moreover, when deliberating which IT-changes to make, the consequences of choosing a certain scenario may be difficult to grasp. One way to ascertain the quality of IT investment decisions is through the use of methods from decision theory. This paper proposes the use of one such method to facilitate IT-investment decision making, viz. extended influence diagrams. An extended influence diagram is a tool able to completely describe and analyse a decision situation. The applicability of extended influence diagrams is demonstrated at the end of the paper by using an extended influence diagram in combination with the ISO/IEC 9126 software quality characteristics and metrics as means to assist a decision maker in a decision regarding an IT-investment.

Pontus Johnson; Robert Lagerström; Per Närman; Mårten Simonsson

2007-01-01

304

ConcepTest: Relative Time Diagram #4  

Science.gov (United States)

Match the features in the relative time diagram below with the events described in the short sentence. Assume all rocks are sedimentary unless otherwise indicated. Which sedimentary unit did not experience contact ...

305

ConcepTest: Relative Time Diagram #3  

Science.gov (United States)

Match the features in the relative time diagram below with the events described in the short sentence. Assume all rocks are sedimentary unless otherwise indicated. Which unit is composed of granite and older than ...

306

ConcepTest: Relative Time Diagram #1  

Science.gov (United States)

Match the features in the relative time diagram below with the events described in the short sentence. Assume all rocks are sedimentary unless otherwise indicated. Which is the oldest rock unit? a. A b. B c. C d. D ...

307

ConcepTest: Relative Time Diagram #2  

Science.gov (United States)

Match the features in the relative time diagram below with the events described in the short sentences. Assume all rocks are sedimentary unless otherwise indicated. Which unit was formed before A but after E? a. C ...

308

Beyond Feynman Diagrams (1/3)  

CERN Document Server

For decades the central theoretical tool for computing scattering amplitudes has been the Feynman diagram. However, Feynman diagrams are just too slow, even on fast computers, to be able to go beyond the leading order in QCD, for complicated events with many jets of hadrons in the final state. Such events are produced copiously at the LHC, and constitute formidable backgrounds to many searches for new physics. Over the past few years, alternative methods that go beyond ...

CERN. Geneva

2013-01-01

309

A proposed Ontology to support Modeling Diagrams  

Directory of Open Access Journals (Sweden)

Full Text Available This paper investigates ontology. Ontology exhibits enormous potential in making software more efficient, adaptive, and intelligent. It is recognized as one of the areas which will bring the next breakthrough in software development. Ontology specifies a rich description of the terminology, concepts and properties explicitly defining concepts. Since understanding concepts and terms is one of the difficulties in modeling diagrams, this paper suggests an ontology aiming to identify some heavily used modelling diagrams concepts to make them easier to perform.

Nisreen Innab; Nidal Yousef; Mohammad Al-Fayoumi

2010-01-01

310

On the diagram of Schröder permutations  

UK PubMed Central (United Kingdom)

Egge and Mansour have recently studied permutations which avoid 1243 and 2143 regardingthe occurrence of certain additional patterns. Some of the open questions related to their work can easilybe answered by using permutation diagrams. As for 132-avoiding permutations the diagram approachgives insights into the structure of f1243; 2143g-avoiding permutations that yield simple proofs for someenumerative results concerning forbidden patterns in such permutations.

Astrid Reifegerste

311

On the diagram of Schroeder permutations  

CERN Multimedia

Egge and Mansour have recently studied permutations which avoid 1243 and 2143 regarding the occurrence of certain additional patterns. Some of the open questions related to their work can easily be answered by using permutation diagrams. Like for 132-avoiding permutations the diagram approach gives insights into the structure of {1243,2143}-avoiding permutations that yield simple proofs for some enumerative results concerning forbidden patterns in such permutations.

Reifegerste, A

2002-01-01

312

On the diagram of Schröder permutations  

UK PubMed Central (United Kingdom)

Egge and Mansour have recently studied permutations which avoid 1243 and 2143 regarding the occurrence of certain additional patterns. Some of the open questions related to their work can easily be answered by using permutation diagrams. As for 132-avoiding permutations the diagram approach gives insights into the structure of {1243, 2143}-avoiding permutations that yield simple proofs for some enumerative results concerning forbidden patterns in such permutations.

Astrid Reifegerste

313

Fluctuations and the QCD phase diagram  

CERN Document Server

In this contribution the role of quantum fluctuations for the QCD phase diagram is discussed. This concerns in particular the importance of the matter back-reaction to the gluonic sector. The impact of these fluctuations on the location of the confinement/deconfinement and the chiral transition lines as well as their interrelation are investigated. Consequences of our findings for the size of a possible quarkyonic phase and location of a critical endpoint in the phase diagram are drawn.

Schaefer, Bernd-Jochen

2011-01-01

314

Four-states phase diagram of proteins  

CERN Multimedia

A four states phase diagram for protein folding as a function of temperature and solvent quality is derived from an improved 2-d lattice model taking into account the temperature dependence of the hydrophobic effect. The phase diagram exhibits native, globule and two coil-type regions. In agreement with experiment, the model reproduces the phase transitions indicative of both warm and cold denaturations. Finally, it predicts transitions between the two coil states and a critical point.

Collet, O

2005-01-01

315

A duality property of planar Feynman diagrams  

Science.gov (United States)

It is found that the Fourier-transform of the amplitude of a planar Feynman diagram G can be written as the amplitude of the Feynman diagram G~, where G~ is the dual of G in the sense of graph theory of graph theory, the propagators of G~ being the Fourier-transformed of the ordinary ones. Associé au Centre National de la Recherche Scientifique.

David, F.; Tuan, R. Hong

1985-08-01

316

QCD Phase Diagram with Imaginary Chemical Potential  

CERN Document Server

We report our recent results on the QCD phase diagram obtained from the lattice QCD simulation. The location of the phase boundary between hadronic and QGP phases in the two-flavor QCD phase diagram is investigated. The imaginary chemical potential approach is employed, which is based on Monte Carlo simulations of the QCD with imaginary chemical potential and analytic continuation to the real chemical potential region.

Nagata, Keitaro

2011-01-01

317

QCD Phase Diagram with Imaginary Chemical Potential  

Directory of Open Access Journals (Sweden)

Full Text Available We report our recent results on the QCD phase diagram obtained from the lattice QCD simulation. The location of the phase boundary between hadronic and QGP phases in the two-flavor QCD phase diagram is investigated. The imaginary chemical potential approach is employed, which is based on Monte Carlo simulations of the QCD with imaginary chemical potential and analytic continuation to the real chemical potential region.

Nagata Keitaro; Nakamura Atsushi

2012-01-01

318

Order-of-Magnitude Influence Diagrams  

CERN Document Server

In this paper, we develop a qualitative theory of influence diagrams that can be used to model and solve sequential decision making tasks when only qualitative (or imprecise) information is available. Our approach is based on an order-of-magnitude approximation of both probabilities and utilities and allows for specifying partially ordered preferences via sets of utility values. We also propose a dedicated variable elimination algorithm that can be applied for solving order-of-magnitude influence diagrams.

Marinescu, Radu

2012-01-01

319

Discussion of the Hubble diagram of QSOs  

Energy Technology Data Exchange (ETDEWEB)

If QSOs have cosmological redshifts, the dispersion in their Hubble diagram would originate mainly from the dispersion of their absolute magnitudes. The problem of standard candles of QSOs have been studied in some papers, eg. refs. (3--9). By analysing statistical distribution of visual magnitudes, Cao et al. have got the Hubble diagram of QSOs and made some relevant discussion. In this paper the relationship between the QSOs' standard candles and their mean visual magnitudes has been investigated theoretically.

Cao Shenglin; Xiao Xinghua; Shi Zhaomin; Liu Yongzhen; Jiang Shuding; Tang Xiaoying; Bian Yulin

1982-10-01

320

Temperature-concentration diagram of polymer solutions  

International Nuclear Information System (INIS)

A (T,C) diagram - were T is the temperature, C the monomer concentration - is described for polymer solutions, from a tricritical approach to the polymer theta point. Four different regions are defined in this diagram. For each of these regions the T, N, C, dependence of the mean square end to end distance of a chain, the screening length, the osmotic pressure, and the second virial coefficient are calculated. A scaling form is also given for the equation of state

1976-01-01

 
 
 
 
321

On Coxeter Diagrams of complex reflection groups  

CERN Document Server

We study complex Coxeter diagrams of some unitary reflection groups. Using solely the combinatorics of diagrams, we give a new proof of the classification of root lattices defined over $\\cE = \\ZZ[e^{2 \\pi i/3}]$: there are only four such lattices, namely, the $\\cE$--lattices whose real forms are $A_2$, $D_4$, $E_6$ and $E_8$. Next, we address the issue of characterizing the diagrams for unitary reflection groups, a question that was raised by Broue, Malle and Rouquier. To this end, we describe an algorithm which, given a unitary reflection group $G$, picks out a set of complex reflections. If $G$ is the reflection group of a root lattice defined over $\\cE$, the reflections selected by the algorithm form the known diagram for $G$. For the reflection group of the complex Coxeter-Todd lattice $K_{12}^{\\cE}$, we find a new diagram that extends to an "affine diagram" with $\\ZZ/7\\ZZ$ symmetry. If $G$ is a Weyl group, the algorithm immediately yields a set of simple roots. Otherwise, experimental evidences indicate ...

Basak, Tathagata

2008-01-01

322

Constraints Modeling in FRBR Data Model Using OCL  

Science.gov (United States)

Transformation of the conceptual FRBR data model to the class diagram in UML 2.0 notation is given. The class diagram is formed using MagicDraw CASE tool. The paper presents a class diagram for the first group of FRBR entities ie. classes (the product of intellectual or artistic endeavour). It is demonstrated how to model constraints over relationships between classes in FRBR object data model using OCL 2.0.

Rudi?, Gordana

2011-09-01

323

HOW VISIO 2003 CAN INFLUENCE INFORMATION TECHNOLOGY–CREATING UML MODELS  

Directory of Open Access Journals (Sweden)

Full Text Available Developing an overall architecture and design before you begin to write code helps you produce asoftware system that meets requirements and is easier to develop and maintain in the long run. Asyou model a software system, you progressively develop the detail of that system, alternatelydecomposing high-level objectives and broad requirements into manageable pieces, and thenassembling software components into packages and eventually a complete run-time system. Modelsand diagrams make it easier to visualize both high-level architecture and low-level components, soyou can make the most of design opportunities or spot potential problems before you write code.

Adrian LUPASC

2005-01-01

324

Collaborative Learning Skills in Multi-touch Tables for UML Software Design  

Directory of Open Access Journals (Sweden)

Full Text Available The use of Multi-touch interfaces for collaborative learning has received significant attention. Their ability to synchronously accommodate multiple users is an advantage in co-located collaborative design tasks. This paper explores the Multi-touch interface’s potential in collaborative Unified Modeling Language diagramming by comparing it to a PC-based tool, looking at the Collaborative Learning Skills and amount of physical interactions in both conditions. The results show that even though participants talked more in the PC-based condition, the use of the Multi-touch table increased the amount of physical interactions, and encouraged the “Creative Conflict” skills amongst the team members.

Mohammed Basheri; Malcolm Munro; Liz Burd; Nilufar Baghaei

2013-01-01

325

RTDT: A Front-End for Efficient Model Checking of Synchronous Timing Diagrams  

UK PubMed Central (United Kingdom)

Model checking [6, 13] is an automated procedure for determining whether a finite state program satisfies a temporal property. Model checking tools, due to the complex nature of the specification methods, are used most effectively by verification experts. In order to make these tools more accessible to nonexpert users, who may not be familiar with these formal notations, we need to make model checkers easier to use. Visually intuitive specification methods may provide an alternative way to specify temporal behavior. One such visual notation that is already widely used in industrial practice to specify the timing behavior of hardware systems is timing diagrams. Synchronous Regular Timing Diagrams (SRTDs) [1] are a class of timing diagrams that correspond to regular languages. SRTDs are a very effective formal specification notation since (1) they have a simple syntax and semantics that corresponds to common usage, and (2) there are efficient linear-ti...

Nina Amla; E. Allen Emerson; Robert P. Kurshan; Kedar Namjoshi

326

Microwave window breakdown experiments and simulations on the UM/L-3 relativistic magnetron.  

UK PubMed Central (United Kingdom)

Experiments have been performed on the UM/L-3 (6-vane, L-band) relativistic magnetron to test a new microwave window configuration designed to limit vacuum side breakdown. In the baseline case, acrylic microwave windows were mounted between three of the waveguide coupling cavities in the anode block vacuum housing and the output waveguides. Each of the six 3 cm deep coupling cavities is separated from its corresponding anode cavity by a 1.75 cm wide aperture. In the baseline case, vacuum side window breakdown was observed to initiate at single waveguide output powers close to 20 MW. In the new window configuration, three Air Force Research Laboratory-designed, vacuum-rated directional coupler waveguide segments were mounted between the coupling cavities and the microwave windows. The inclusion of the vacuum side power couplers moved the microwave windows an additional 30 cm away from the anode apertures. Additionally, the Lucite microwave windows were replaced with polycarbonate windows and the microwave window mounts were redesigned to better maintain waveguide continuity in the region around the microwave windows. No vacuum side window breakdown was observed in the new window configuration at single waveguide output powers of 120+MW (a factor of 3 increase in measured microwave pulse duration and factor of 3 increase in measured peak power over the baseline case). Simulations were performed to investigate likely causes for the window breakdown in the original configuration. Results from these simulations have shown that in the original configuration, at typical operating voltage and magnetic field ranges, electrons emitted from the anode block microwave apertures strike the windows with a mean kinetic energy of 33 keV with a standard deviation of 14 keV. Calculations performed using electron impact angle and energy data predict a first generation secondary electron yield of 65% of the primary electron population. The effects of the primary aperture electron impacts, combined with multiplication of the secondary populations, were determined to be the likely causes of the poor microwave window performance in the original configuration.

Hoff BW; Mardahl PJ; Gilgenbach RM; Haworth MD; French DM; Lau YY; Franzi M

2009-09-01

327

Microwave window breakdown experiments and simulations on the UM/L-3 relativistic magnetron  

Science.gov (United States)

Experiments have been performed on the UM/L-3 (6-vane, L-band) relativistic magnetron to test a new microwave window configuration designed to limit vacuum side breakdown. In the baseline case, acrylic microwave windows were mounted between three of the waveguide coupling cavities in the anode block vacuum housing and the output waveguides. Each of the six 3 cm deep coupling cavities is separated from its corresponding anode cavity by a 1.75 cm wide aperture. In the baseline case, vacuum side window breakdown was observed to initiate at single waveguide output powers close to 20 MW. In the new window configuration, three Air Force Research Laboratory-designed, vacuum-rated directional coupler waveguide segments were mounted between the coupling cavities and the microwave windows. The inclusion of the vacuum side power couplers moved the microwave windows an additional 30 cm away from the anode apertures. Additionally, the Lucite microwave windows were replaced with polycarbonate windows and the microwave window mounts were redesigned to better maintain waveguide continuity in the region around the microwave windows. No vacuum side window breakdown was observed in the new window configuration at single waveguide output powers of 120+MW (a factor of 3 increase in measured microwave pulse duration and factor of 3 increase in measured peak power over the baseline case). Simulations were performed to investigate likely causes for the window breakdown in the original configuration. Results from these simulations have shown that in the original configuration, at typical operating voltage and magnetic field ranges, electrons emitted from the anode block microwave apertures strike the windows with a mean kinetic energy of 33 keV with a standard deviation of 14 keV. Calculations performed using electron impact angle and energy data predict a first generation secondary electron yield of 65% of the primary electron population. The effects of the primary aperture electron impacts, combined with multiplication of the secondary populations, were determined to be the likely causes of the poor microwave window performance in the original configuration.

Hoff, B. W.; Mardahl, P. J.; Gilgenbach, R. M.; Haworth, M. D.; French, D. M.; Lau, Y. Y.; Franzi, M.

2009-09-01

328

Hot strain diagrams, strengthening and recrystallization of nitrogen alloyed steels  

Energy Technology Data Exchange (ETDEWEB)

Kinetics of deformation strengthening, polygonization and recrystallization processes have been studied, effects of alloying by nitrogen, combined carbon and nitrogen as well as by various other elements (Cr, Mo, Ni, Mn, V etc.) have been estimated for steels of different compositions and applications. Strain diagrams and structure state maps for the studied steels are presented. Strain diagram shape and attainable hot strength depend on the deformation conditions and basic alloying which determine strain hardening and diffusional processes of post-deformation softening. Alloying by nitrogen increases hot and cold strain hardening and retards recrystallization. Maximum strengthening obtained by cold deformation is accompanied by lowering of ductility and fracture toughness. Hence, it is applicable mainly to the austenitic steels. Nitrogen alloying enhances the austenite stability against {gamma} {yields} {alpha} transformation and consequently allows extending a composition range of steels which can be strengthened by cold deformation with large strains. The high-temperature thermomechanical treatment is more effective as a treatment improving a combination of mechanical properties. The schemes and regimes of thermomechanical strengthening treatments are proposed for low- and high- nitrogen containing steels of various structure classes. (orig.)

Kaputkina, L.M.; Prokoshkina, V.G.; Lojnikov, Yu.I. [Moscow State Steel and Alloys Inst. (Russian Federation)

2004-07-01

329

Non local theories: New rules for old diagrams  

International Nuclear Information System (INIS)

We show that a general variant of the Wick theorems can be used to reduce the time ordered products in the Gell-Mann and Low formula for a certain class on non local quantum field theories, including the case where the interaction Lagrangian is defined in terms of twisted products. The only necessary modification is the replacement of the Stueckelberg-Feynman propagator by the general propagator (the 'contractor' of Denk and Schweda) D(y-y';?-?')=(1)/i(?+(y-y')?(?-?')+?+(y'-y)?(?'-?)), where the violations of locality and causality are represented by the dependence of ?,?' on other points, besides those involved in the contraction. This leads naturally to a diagrammatic expansion of the Gell-Mann and Low formula, in terms of the same diagrams as in the local case, the only necessary modification concerning the Feynman rules. The ordinary local theory is easily recovered as a special case, and there is a one-to-one correspondence between the local and non local contributions corresponding to the same diagrams, which is preserved while performing the large scale limit of the theory. (author)

2004-01-01

330

An index of lipid phase diagrams.  

UK PubMed Central (United Kingdom)

There is a growing awareness of the utility of lipid phase behavior data in studies of membrane-related phenomena. Such miscibility information is commonly reported in the form of temperature-composition (T-C) phase diagrams. The current index is a conduit to the relevant literature. It lists lipid phase diagrams, their components and conditions of measurement, and complete bibliographic information. The main focus of the index is on lipids of membrane origin where water is the dispersing medium. However, it also includes records on acylglycerols, fatty acids, cationic lipids, and detergent-containing systems. The miscibility of synthetic and natural lipids with other lipids, with water, and with biomolecules (proteins, nucleic acids, carbohydrates, etc.) and non-biological materials (drugs, anesthetics, organic solvents, etc.) is within the purview of the index. There are 2188 phase diagram records in the index, the bulk (81%) of which refers to binary (two-component) T-C phase diagrams. The remainder is made up of more complex (ternary, quaternary) systems, pressure-T phase diagrams, and other more exotic miscibility studies. The index covers the period from 1965 through to July, 2001.

Koynova R; Caffrey M

2002-05-01

331

Adapting OCL Constraints After a Refactoring of their Model Using an MDE Process  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Refactoring is a kind of endogenous model transformation. Its aim is to restructure applications without changing their external behavior. Several studies have been carried out on the refactoring of UML models specifically on the refactoring of UML class diagram models. During refactoring, the OCL c...

Hassam, Kahina; Sadou, Salah; Fleurquin, Régis

332

Phase diagram for magnetic nano-rings  

International Nuclear Information System (INIS)

The minimum-energy single-domain magnetization state in a magnetized nano-ring is determined as a function of material and shape parameters. A phase diagram is derived within the framework of a Fourier-space approach for magnetic computations, showing the expected position of the ground state for any given set of external degrees of freedom. A series of micromagnetic simulations for suitably chosen parameters, show excellent agreement with the obtained theoretical results. An electron holography experiment has been carried out as a test on phase diagram reliability. The validity of the treatment, in particular the simplification employed in choosing ideal uniform rather than more physical quasi-uniform single-domain states, is thoroughly discussed in order to establish clear boundaries of applicability of the phase diagram.

2006-01-01

333

A Logarithmic-Amplitude Polar Diagram  

Directory of Open Access Journals (Sweden)

Full Text Available A polar diagram where the amplitude of the transfer function is on a logarithmic scale, is presented. This gives a one-size-fits-all diagram with no need for zooming in and out, and no need for additional reasoning about infinite-radius encirclements when there are poles on the imaginary axis - as opposed to what is usually neccessary with the standard polar (Nyquist-) diagram. All properties needed for stability considerations are upheld, such as encirclements, gain and phase margins. The path for s in the loop transfer function is carefully chosen with regard to possible poles on the imaginary axis. Small excursions into the right half plane in the form of arcs of different-sized logarithmic spirals result in corresponding large but finite arcs that do not overlap in the logarithmic polar plots.

Trond Andresen

2001-01-01

334

Phase Diagram of Silicon from Atomistic Simulations  

Science.gov (United States)

In this Letter we present a calculation of the temperature-pressure phase diagram of Si in a range of pressures covering from -5 to 20 GPa and temperatures up to the melting point. The phase boundaries and triple points between the diamond, liquid, ?-Sn, and Si34 clathrate phases are reported. We have employed efficient simulation techniques to calculate free energies and to numerically integrate the Clausius-Clapeyron equation, combined with a tight-binding model capable of an accuracy comparable to that of first-principles methods. The resulting phase diagram agrees well with the available experimental data.

Kaczmarski, M.; Bedoya-Martínez, O. N.; Hernández, E. R.

2005-03-01

335

Phase diagram of silicon from atomistic simulations.  

UK PubMed Central (United Kingdom)

In this Letter we present a calculation of the temperature-pressure phase diagram of Si in a range of pressures covering from -5 to 20 GPa and temperatures up to the melting point. The phase boundaries and triple points between the diamond, liquid, beta-Sn, and Si34 clathrate phases are reported. We have employed efficient simulation techniques to calculate free energies and to numerically integrate the Clausius-Clapeyron equation, combined with a tight-binding model capable of an accuracy comparable to that of first-principles methods. The resulting phase diagram agrees well with the available experimental data.

Kaczmarski M; Bedoya-Martínez ON; Hernández ER

2005-03-01

336

Computer generated timing diagrams to supplement simulation  

CERN Multimedia

The ISPS computer description language has been used in a simulation study to specify the components of a high speed data acquisition system and its protocols. A facility has been developed for automatically generating timing diagrams from the specification of the data acquisition system written in the ISPS description language. Diagrams can be generated for both normal and abnormal working modes of the system. They are particularly useful for design and debugging in the prototyping stage of a project and can be later used for reference by maintenance engineers. (11 refs).

Booth, A W

1981-01-01

337

Phase diagrams modified by interfacial penalties  

Directory of Open Access Journals (Sweden)

Full Text Available The conventional forms of phase diagrams are constructed without consideration of interfacial energies and they represent an impor­tant tool for chemical engineers and metallurgists. If interfacial energies are taken into consideration, it is intuitively obvious that the regions of phase equilibria must become smaller, because there is a penalty on the formation of interfaces. We investigate this phe­nomenon qualitatively for a one-dimensional model, in which the phases occur as layers rather than droplets or bubbles. The modified phase diagrams are shown in Chapters 3 and 4.

Atanackovi? T.M.; Huo Y.; Jeli?i? Z.; Müller I.

2007-01-01

338

Thermal phase diagram of a model hamiltonian for columnar phases of liquid crystals  

CERN Document Server

We present the phase diagram and critical properties of a coupled XY-Ising model on a triangular lattice using the mean-field approximation, the Migdal-Kadanoff scheme of renormalization group and Monte-Carlo simulations. The topology of the phase diagram is similar for the three techniques, with the appearance of a phase with XY order and Ising disorder. The results suggest a line of transitions belonging to the 2D-Ising universality class in contrast with previous data indicating a new universality class. This model is relevant to the columnar phases of discotic liquid crystals [such as hexa(hexylthio)triphenylene (HHTT)] in the limit of weak intercolumn coupling.

Hebert, M

1996-01-01

339

Phase Diagram of Vertically Shaken Granular Matter  

CERN Multimedia

A shallow, vertically shaken granular bed in a quasi 2-D container is studied experimentally yielding a wider variety of phenomena than in any previous study: (1) bouncing bed, (2) undulations, (3) granular Leidenfrost effect, (4) convection rolls, and (5) granular gas. These phenomena and the transitions between them are characterized by dimensionless control parameters and combined in a full experimental phase diagram.

Eshuis, P; Lohse, D; Van der Meer, D; Van der Weele, K; Bos, Robert; Eshuis, Peter; Lohse, Detlef; Meer, Devaraj van der; Weele, Ko van der

2006-01-01

340

Yttrium. Properties, Phase Diagrams, Industrial Applications.  

Science.gov (United States)

The book generalizes available literature data on the preparation and purification of yttrium, and also on its properties, phase diagrams, and the properties of its alloys. It also presents a survey of the most important branches of the application of ytt...

V. F. Terekhova E. M. Savitskii

1970-01-01

 
 
 
 
341

Feynman Diagrams and Lax Pair Equations  

CERN Multimedia

We find a Lax pair equation corresponding to the Connes-Kreimer Birkhoff factorization of the character group of the Hopf algebra of Feynman diagrams. In particular, we obtain a flow for the character given by Feynman rules, and present a worked example.

Baditoiu, G; Baditoiu, Gabriel; Rosenberg, Steven

2006-01-01

342

Eh-pH diagrams for geochemistry  

International Nuclear Information System (INIS)

[en] In this book generic Eh-pH diagrams are presented for the chemical elements and their species in the presence of water and with, where relevant, the presence of dissolved sulfur and carbon dioxide. Some 75 elements are covered here; only the alkali elements, the noble gases, and a few radioactive elements for which there are insufficient thermodynamic data, have been omitted. Included are those elements with more than one valance in natural waters, and those monovalent elements are sensitive to sulfide-sulfate redox conditions. In addition, the stability fields of solids and aqueous species of pH-dependent only elements are plotted in Eh-pH space so that the reader may compare these conditions for a great variety of species stable under the Eh-pH limits of water. This book attempts to gather all the good to very good thermodynamic data useful for the 75 elements considered, and to construct the appropriate Eh-pH diagrams. A brief text accompanies each element that is designed to explain the diagram for that element, but is not in any sense intended to be a comprehensive discussion of the geochemistry of the elements. In many cases a brief text is added on the importance of various elements to problems of hazardous waste disposal. The diagrams have been constructed for 250C and a 1 bar pressure conditions. (orig./RB) With 98 figs., 61 tabs

1988-01-01

343

Construction of Lax operators from weight diagrams  

International Nuclear Information System (INIS)

We show that cyclic weight diagrams corresponding to representations of affine Lie algebras allow one to read-off the associated Lax operator. The resultant Lax pair generates the modified KdV equations, and have been shown in some cases to produce acceptable solutions of the string equation of matrix models

1991-01-01

344

An AGN Hertzsprung-Russell Diagram  

CERN Multimedia

Detailed examination of the balance between star-formation and nuclear activity in AGN and starburst galaxies leads to the composition of an Hertzsprung-Russell diagram in which possible evolutionary tracks can be drawn. It is likely that these tracks also relate to the level of obscuration.

Barthel, P D

2002-01-01

345

The Binary Temperature-Composition Phase Diagram  

Science.gov (United States)

The equations for the liquid and gas lines in the binary temperature-composition phase diagram are derived by approximating that delta(H)[subscript vap] of the two liquids are equal. It is shown that within this approximation, the resulting equations are not too difficult to present in an undergraduate physical chemistry lecture.

Sanders, Philip C.; Reeves, James H.; Messina, Michael

2006-01-01

346

Dynamical mechanism for the hairpin diagram.  

Science.gov (United States)

Based on the non-valence quark-antiquark and gluon constituent structure of mesons we give a reasonable dynamical mechanism which can induce the hairpin diagram without violating the well-observed OZI rule. We calculate the hairpin amplitudes of D deg. yi...

C. Chang X. Guo X. Li

1989-01-01

347

Mixed wasted integrated program: Logic diagram  

International Nuclear Information System (INIS)

The Mixed Waste Integrated Program Logic Diagram was developed to provide technical alternative for mixed wastes projects for the Office of Technology Development's Mixed Waste Integrated Program (MWIP). Technical solutions in the areas of characterization, treatment, and disposal were matched to a select number of US Department of Energy (DOE) treatability groups represented by waste streams found in the Mixed Waste Inventory Report (MWIR).

1994-01-01

348

Diagrammatic methods for spinors in Feynman diagrams  

Energy Technology Data Exchange (ETDEWEB)

We introduce new graphical methods which simplify the manipulation of group-theoretic factors involving spinors which arise, for example, in the evaluation of Feynman diagrams. These methods are applicable to both internal and Poincare symmetries, and form a natural extension of previous techniques for fundamental and adjoint representations, which are also reviewed in this paper.

Kennedy, A.D.

1982-10-15

349

An Interval Decision Diagram Based Firewall  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper explores the use of Interval Decision Diagrams (IDDs) as the central structure of a firewall packet filtering mechanism. This is done by first relating the packet filtering problem to predicate logic, then implementing a prototype which is used in an empirical evaluation. The main benefit...

Christiansen, Mikkel; Fleury, Emmanuel

350

Penguin diagrams for the HYP staggered fermions  

CERN Multimedia

We present results of the one-loop corrections originating from the penguin diagrams for the improved staggered fermion operators constructed using various fat links such as Fat7, Fat7+Lepage, $\\bar{\\rm Fat7}$, HYP (I) and HYP (II). The main results include the diagonal/off-diagonal mixing coefficients and the matching formula between the continuum and lattice operators.

Choi, K; Choi, Keunsu; Lee, Weonjong

2004-01-01

351

The classification of diagrams in perturbation theory  

Energy Technology Data Exchange (ETDEWEB)

The derivation of scattering equations connecting the amplitudes obtained from diagrammatic expansions is of interest in many branches of physics. One method for deriving such equations is the classification-of-diagrams technique of Taylor. However, as we shall explain in this paper, there are certain points of Taylor`s method which require clarification. First, it is not clear whether Taylor`s original method is equivlant to the simpler classification-of-diagrams scheme used by Thomas, Rinat, Afnan, and Blankleider (TRAB). Second, when the Taylor method is applied to certain problems in a time-dependent perturbation theory it leads to the over-counting of some diagrams. This paper first restates Taylor`s method, in the process uncovering reasons why certain diagrams might be double-counted in the Taylor method. In then explores how far Taylor`s method is equivalent to the simpler TRAB method. Finally, it examines precisely why the double-counting occurs in Taylor`s method and derives corrections which compensate for this double-counting. {copyright} 1995 Academic Press, Inc.

Phillips, D.R.; Afnan, I.R. [School of Physical Sciences, The Flinders University of South Australia, GPO Box 2100, Adelaide 5001 (Australia)

1995-06-01

352

Magnetic phase diagram of a nanocone  

International Nuclear Information System (INIS)

In this work we analyze the magnetic properties of truncated conical nanoparticles. Based on the continuous magnetic model we find expressions for the total energy in three different magnetic configurations. Finally, we calculate the magnetic phase diagram as function of the geometrical parameters.

2008-11-01

353

Weight diagram construction of Lax operators  

Energy Technology Data Exchange (ETDEWEB)

We review and expand methods introduced in our previous paper. It is proved that cyclic weight diagrams corresponding to representations of affine Lie algebras allow one to construct the associated Lax operator. The resultant Lax operator is in the Miura-like form and generates the modified KdV equations. The algorithm is extended to the super-symmetric case.

Carbon, S.L.; Piard, E.J.

1991-10-01

354

Phase diagrams modified by interfacial penalties  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The conventional forms of phase diagrams are constructed without consideration of interfacial energies and they represent an impor­tant tool for chemical engineers and metallurgists. If interfacial energies are taken into consideration, it is intuitively obvious that the regions of phase equilibria ...

Atanackovi? T.M.; Huo Y.; Jeli?i? Z.; Müller I.

355

Phase Diagrams of Strongly Interacting Theories  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We summarize the phase diagrams of SU, SO and Sp gauge theories as function of the number of flavors, colors, and matter representation as well as the ones of phenomenologically relevant chiral gauge theories such as the Bars-Yankielowicz and the generalized Georgi-Glashow models. We finally report ...

Sannino, Francesco

356

Weight diagram construction of Lax operators  

International Nuclear Information System (INIS)

We review and expand methods introduced in our previous paper. It is proved that cyclic weight diagrams corresponding to representations of affine Lie algebras allow one to construct the associated Lax operator. The resultant Lax operator is in the Miura-like form and generates the modified KdV equations. The algorithm is extended to the super-symmetric case

1991-01-01

357

Towards IEC 61499 Function Blocks Diagrams Verification  

Digital Repository Infrastructure Vision for European Research (DRIVER)

After having sketched the different techniques enabling to check properties of Discrete Event Systems control software, we present in this article a formal method for IEC 61499 function blocks diagrams verification. This method is based on a formal representation of the behaviour of function blocks ...

Schnakenbourg, Camille; Faure, Jean-Marc; Lesage, Jean-Jacques

358

The Boundary Theory of Phase Diagrams and Its Application  

CERN Multimedia

The Boundary Theory of Phase Diagrams and Its Application -- Rules for Phase Diagram Construction with Phase Regions and Their Boundaries presents a novel theory of phase diagrams. Thoroughly revised on the basis of the Chinese edition and rigorously reviewed, this book inspects the general feature and structure of phase diagrams, and reveals that there exist actually two categories of boundaries. This innovative boundary theory has solved many difficulties in understanding phase diagrams, and also finds its application in constructing multi-component phase diagrams or in calculating high-pres

Zhao, Muyu; Fan, Xiaobao

2011-01-01

359

Towers of recollement and bases for diagram algebras: planar diagrams and a little beyond  

CERN Document Server

The recollement approach to the representation theory of sequences of algebras is extended to pass basis information directly through the globalisation functor. The method is hence adapted to treat sequences that are not necessarily towers by inclusion, such as symplectic blob algebras (diagram algebra quotients of the type-$\\hati{C}$ Hecke algebras). By carefully reviewing the diagram algebra construction, we find a new set of functors interrelating module categories of ordinary blob algebras (diagram algebra quotients of the type-${B}$ Hecke algebras) at {\\em different} values of the algebra parameters. We show that these functors generalise to determine the structure of symplectic blob algebras, and hence of certain two-boundary Temperley-Lieb algebras arising in Statistical Mechanics. We identify the diagram basis with a cellular basis for each symplectic blob algebra, and prove that these algebras are quasihereditary over a field for almost all parameter choices, and generically semisimple. (That is, we ...

Martin, P; Parker, A; Martin, Paul; Parker, Alison

2006-01-01

360

Weak radical classes  

Directory of Open Access Journals (Sweden)

Full Text Available We introduce the concept of weak radical classes and proceed to construct these classes. In section 2 we define strongly austere semimodules. Theorem 1 characterizes strongly autere semimodules with respect to modular maximal subtractive ideals. We present an example of a weak radical class that can be neither a semiradical class nor a radical class. In section 4 we show that the semiradical class over a certain restricted class of semirings is equivalent to the weak radical class. We also demonstrate the construction of a semiradical class over this class. Finally, we show in example 3 that a semiradical class need not to be a radical class.

Huda Mohammed J. Al-Thani

2004-01-01

 
 
 
 
361

Reduction of One Loop Feynman Diagrams in Scalar Field Theory  

CERN Document Server

This is a historical note. In 1979 we wrote a paper in a Russian Journal called Vestnik Leingradskogo Gosudarstvennogo Universiteta. We considered massive scalar quantum filed theory. One loop Feynman diagrams were evaluated. Theorem was proved that one loop diagram with many internal lines [more then dimension of space-time] can be expressed in terms of one loop diagram with number of internal lines equal to the dimension of space-time [multiplied by tree diagrams]. This is translation in English.

Izergin, A G

2013-01-01

362

The skew diagram poset and components of skew characters  

CERN Document Server

We investigate the poset of skew diagrams ordered by adding or forming the union of skew diagrams. We will show that a skew diagram which has at least n convex corners to the upper left and also to the lower right is larger than the skew diagram consisting of n disconnected single boxes. Using this property, we obtain lower bounds for the number of components, constituents and pairs of components which differ by one box in a given skew character.

Gutschwager, Christian

2011-01-01

363

Ways to measure the hairpin diagram in charmed meson decays  

International Nuclear Information System (INIS)

The possible presence of hairpin diagrams is analyzed in the model-independent quark-diagram scheme for two-body decays of charmed mesons. Current experimental data do not require the presence of hairpin diagrams in D?VP (V: vector meson, P: pseudoscalar meson), in accordance with the OZI rule. However, there is a possible indication that they are important in the decay of D?PP. The measurement of Ds+??+?' is crucial to test the mechanism of hairpin diagrams. (orig.)

1992-01-01

364

Overture: The grid classes  

Energy Technology Data Exchange (ETDEWEB)

Overture is a library containing classes for grids, overlapping grid generation and the discretization and solution of PDEs on overlapping grids. This document describes the Overture grid classes, including classes for single grids and classes for collections of grids.

Brislawn, K.; Brown, D.; Chesshire, G.; Henshaw, W. [and others

1997-01-01

365

Phase diagram for interacting Bose gases  

International Nuclear Information System (INIS)

We propose a modified form of the inversion method in terms of a self-energy expansion to access the phase diagram of the Bose-Einstein transition. The dependence of the critical temperature on the interaction parameter is calculated. This is discussed with the help of a condition for Bose-Einstein condensation in interacting systems which follows from the pole of the T matrix in the same way as from the divergence of the medium-dependent scattering length. A many-body approximation consisting of screened ladder diagrams is proposed, which describes the Monte Carlo data more appropriately. The specific results are that a non-self-consistent T matrix leads to a linear coefficient in leading order of 4.7, the screened ladder approximation to 2.3, and the self-consistent T matrix due to the effective mass to a coefficient of 1.3 close to the Monte Carlo data.

2007-08-15

366

Condon domain phase diagram for silver  

International Nuclear Information System (INIS)

We present the Condon domain phase diagram for a silver single crystal measured in magnetic fields up to 28 T and temperatures down to 1.3 K. A standard ac method with a pickup coil system is used at low frequency for the measurements of the de Haas-van Alphen effect (dHvA). The transition point from the state of homogeneous magnetization to the inhomogeneous Condon domain state (CDS) is found as the point where a small irreversibility in the dHvA magnetization arises, as manifested by an extremely nonlinear response in the pickup voltage showing threshold character. The third harmonic content in the ac response is used to determine with high precision the CDS phase boundary. The experimentally determined Condon domain phase diagram is in good agreement with the theoretical prediction calculated by the standard Lifshitz-Kosevich formula.

2012-01-01

367

More on phase diagram of Laponite  

CERN Multimedia

The phase diagram of a charged colloidal system (Laponite) has been investigated by dynamic light scattering in a previously unexplored range of salt and clay concentrations. Specifically the clay weight and salt molar concentrations have been varied in the ranges Cw=0.004- 0.025, Cs=(1x 10^-3- 5x 10^-3) M respectively. As in the case of free salt water samples (Cs= 1x 10^-4 M) an aging dynamics towards two different arrested phases is found in the whole examined Cw and Cs range. Moreover a transition between these two different regimes is found for each investigated salt concentration. It is clear from these measurements that a revision of the phase diagram is necessary and a new "transition" line between two different arrested states is drawn.

Ruzicka, B; Ruocco, G

2005-01-01

368

Finding and accessing diagrams in biomedical publications.  

UK PubMed Central (United Kingdom)

Complex relationships in biomedical publications are often communicated by diagrams such as bar and line charts, which are a very effective way of summarizing and communicating multi-faceted data sets. Given the ever-increasing amount of published data, we argue that the precise retrieval of such diagrams is of great value for answering specific and otherwise hard-to-meet information needs. To this end, we demonstrate the use of advanced image processing and classification for identifying bar and line charts by the shape and relative location of the different image elements that make up the charts. With recall and precisions of close to 90% for the detection of relevant figures, we discuss the use of this technology in an existing biomedical image search engine, and outline how it enables new forms of literature queries over biomedical relationships that are represented in these charts.

Kuhn T; Luong T; Krauthammer M

2012-01-01

369

Eikonal diagrams in multiparton semihard interactions  

International Nuclear Information System (INIS)

[en] We study the set of eikonal diagrams, derived from perturbative QCD, at the lowest order in the coupling constant and with vacuum quantum number exchange, in the three-body interaction of a high-energy parton with two target partons. The contribution to the semihard component of the inelastic cross section is worked out by evaluating the leading behavior of all the dominant cut diagrams. The different cut amplitudes are shown to be proportional to one another, with the same weights of the cutting rules which have been derived in the context of multi-Pomeron exchange. As a consequence of the dominant configuration in the loop integrals, corresponding to the projectile parton on shell between successive interactions, the process is represented by the simplest probabilistic picture, where the three-body interaction is factorized as the product of two-body interaction probabilities

1994-01-01

370

A dynamical mechanism for the hairpin diagram  

International Nuclear Information System (INIS)

Based on the non-valence quark-antiquark and gluon constituent structure of mesons we give a reasonable dynamical mechanism which can induce the hairpin diagram without violating the well-observed OZI rule. We calculate the hairpin amplitudes of D deg. ? K-bar deg.? and K-bar deg.?' normalized by D deg. ? K-bar deg.? deg. and have found that the hairpin diagram can give rise to substantial contribution to the decays where a meson with a SU(3) flavor singlet component is involved in the final state. In this scenario, we also obtain the branching ratio of D deg. ? K-bar deg. ? as 0.55% in comparison with the experimental data of 0.83%. (autor). 33 refs, 3 figs.

1989-01-01

371

Random matrix models for phase diagrams  

CERN Document Server

We describe a random matrix approach that can provide generic and readily soluble mean-field descriptions of the phase diagram for a variety of systems ranging from QCD to high-T_c materials. Instead of working from specific models, phase diagrams are constructed by averaging over the ensemble of theories that possesses the relevant symmetries of the problem. Although approximate in nature, this approach has a number of advantages. First, it can be useful in distinguishing generic features from model-dependent details. Second, it can help in understanding the `minimal' number of symmetry constraints required to reproduce specific phase structures. Third, the robustness of predictions can be checked with respect to variations in the detailed description of the interactions. Finally, near critical points, random matrix models bear strong similarities to Ginsburg-Landau theories with the advantage of additional constraints inherited from the symmetries of the underlying interaction. These constraints can be help...

Vanderheyden, Benoit

2011-01-01

372

Pions in the quark matter phase diagram  

International Nuclear Information System (INIS)

The relationship between mesonic correlations and quantum condensates in the quark matter phase diagram is explored within a quantum field theoretical approach of the Nambu and Jona-Lasinio (NJL) type. Mean-field values in the scalar meson and diquark channels are order parameters signaling the occurrence of quark condensates, entailing chiral symmetry breaking (?SB) and color superconductivity (2SC) in quark matter. We investigate the spectral properties of scalar and pseudoscalar meson excitations in the phase diagram in Gaussian approximation and show that outside the ?SB region where the pion is a zero-width bound state, there are two regions where it can be considered as a quasi-bound state with a lifetime exceeding that of a typical heavy-ion collision fireball: (A) the high-temperature ?SB crossover region at low densities and (B) the high-density color superconducting phase at temperatures below 100 MeV.

2008-08-29

373

Intermediate coupling phase diagrams of the cuprates  

Science.gov (United States)

We analyze the competing (non-superconducting) phases in the cuprates in the intermediate coupling regime via Gutzwiller approximation (GA) + RPA. The magnetic GA+RPA phase diagram was benchmarked for the t-t'-U model[1]. The leading instabilities are associated with Fermi surface nesting, generally corresponding to a double nesting criterion, and are different for different cuprates. While electron-doped cuprates are generally associated with commensurate (?,?) nesting [2], there are competing incommensurate phases in the hole doped cuprates. Magnetic and charge-order phase diagrams will be compared. [1] L.F. Tocchio, et al., Phys. Rev. B78, 041101(R) (2008). [2] C. Kusko, et al., Phys. Rev. B. 66, 140513(R) (2002); T. Das, et al., Phys. Rev. Lett. 98, 197004 (2007).

Markiewicz, Robert; Lorenzana, Jose; Seibold, Goetz; Bansil, Arun

2010-03-01

374

Asteroseismic diagrams for solar-type stars  

CERN Multimedia

We explore the feasibility of applying the Christensen-Dalsgaard diagram to real asteroseismic data and provide quantitative measures of the uncertainty associated with the results. We also propose a new kind of seismic diagram, based on the determination of the locations of sharp acoustic features inside a star. We show that by combining the information about the position of the base of the convective envelope or the HeII ionisation zone with a measure of the average large separation, it is possible to constrain the unknown chemical composition or the various parameters characterising the physical processes in the stellar interior. We demonstrate the application of this technique to the analysis of mock data for a CoRoT target star.

Mazumdar, A

2005-01-01

375

Penguin diagrams for improved staggered fermions  

CERN Document Server

We calculate, at the one loop level, penguin diagrams for improved staggered fermion operators constructed using various fat links. The main result is that diagonal mixing coefficients with penguin operators are identical between the unimproved operators and the improved operators using such fat links as Fat7, Fat7+Lepage, $\\bar{\\rm Fat7}$, HYP (I) and HYP (II). In addition, it turns out that the off-diagonal mixing vanishes for those constructed using fat links of Fat7, $\\bar{\\rm Fat7}$ and HYP (II). This is a consequence of the the fact that the improvement by various fat links changes only the mixing with higher dimension operators and off-diagonal operators. The results of this paper, combined with those for current-current diagrams, provide the complete matching at the one loop level with all corrections of ${\\cal O}(g^2)$ included.

Lee, W

2005-01-01

376

MHV Diagrams in Momentum Twistor Space  

CERN Multimedia

We show that there are remarkable simplifications when the MHV diagram formalism for N=4 super Yang-Mills is reformulated in momentum twistor space. The vertices are replaced by unity while each propagator becomes a dual superconformal `R-invariant' whose arguments may be read off from the diagram. The momentum twistor MHV rules generate a formula for the full, all-loop planar integrand of the super Yang-Mills S-matrix that is manifestly dual superconformally invariant up to the choice of a reference twistor. We give a general proof of this reformulation and illustrate its use by computing the momentum twistor NMHV and NNMHV tree amplitudes and the integrands of the MHV and NMHV 1-loop and the MHV 2-loop planar amplitudes.

Bullimore, Mathew; Skinner, David

2010-01-01

377

Enriched model categories and diagram categories  

CERN Multimedia

We collect in one place a variety of known and folklore results in enriched model category theory and add a few new twists. One twist is a new perspective on equivariant model categories. A central theme is a general procedure for constructing a Quillen adjunction, often a Quillen equivalence, between a given V-model category and a category of diagrams in V, where V is any good enriching category. From this perspective, we rederive the result of Schwede and Shipley that reasonable stable model categories are Quillen equivalent to diagram categories of spectra (alias categories of module spectra). The general theory will be applied to G-spectra in a sequel, and for that we need quite a few technical improvements and modifications of general model categorical results. We collect those here. They are bound to have applications in a variety of other contexts.

Guillou, Bertrand

2011-01-01

378

(?,?) phase diagrams in tilted chiral smectics  

International Nuclear Information System (INIS)

The polymorphism of tilted chiral smectics liquid crystals is incredibly rich and encompasses many subphases such as SmCA?; SmCFi1?; SmCFi2?; SmC?; SmC??. The continuum theory established by Marcerou (2010) is used to derive an expression for the free energy density of those subphases. The minimization of this free energy is obtained through a combination of analytical and numerical methods. It leads to a phase diagram built in the (?,?) plane where ? is local angular parameter and ? describes the variation of the temperature. From this graphical representation, many experimentally observed phase sequences of ferroelectric liquid crystals can be explained, even them including subphases which were recently observed like the SmC5? and the SmC6? ones. However, it should be emphasized that the details of predicted phase diagram are strongly dependent on the compound studied.

2013-02-01

379

Phase diagrams of systems exhibiting incommensurate structures  

International Nuclear Information System (INIS)

[en] The global phase diagram of a simple model exhibiting disorder-incommensurate (D-I) transition is analyzed using mean-field approximation. This phase diagram is expected to be qualitatively correct in d=3 dimensions. It is shown that depending on the parameters of this model, the D-I transition either (a) is associated with a small order parameter and may thus be described by a Landau-Ginzburg-Wilson model or (b) has no small order parameter, and the transition takes place via condensation of solitons. The two segments of the transition line are connected by a line of first order transitions. Applications to intercalate systems and to magnetic spirals are considered. (author)

1983-01-01

380

The Integrated Application Based on Real-time Extended UML and Improved Formal Method in Real-time Embedded Software Testing  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper, formal methods were introduced into the real-time embedded software testing field and a real-time extended finite state machine, called rt_EFSM, was studied firstly. And then, the process of the integrated application based on real-time extended Unified Modeling Language (UML) and improved formal method in real-time embedded software testing are put forward. Furthermore, the extension scheme of the real-time UML, including the improvement and extension of state transitions and time constraints described mechanism, and the conversion method from real-time UML to rt_EFSM ware proposed. Finally, combined with the testing process of flight control software of an unmanned aerial vehicle (UAV), a method to generate the time-extended UIO sequence (ex_UIO) was put forward. Finally, the method to generate test cases automatically according to ex_UIO sequence was brought forward. The method proposed in this paper can fully make use of the advantages of tool resources of the UML which has been as the industry standard, but also the advantages of formal methods in accuracy, effectiveness and automation support.

Yongfeng Yin; Bin Liu; Zhen Li; Chun Zhang; Ning Wu

2010-01-01

 
 
 
 
381

Oak Ridge National Laboratory Technology Logic Diagram. Executive Summary  

Energy Technology Data Exchange (ETDEWEB)

This executive summary contains a description of the logic diagram format; some examples from the diagram (Vol. 2) and associated technology evaluation data sheets (Vol. 3); a complete (albeit condensed) listing of the RA, D&D, and WM problems at ORNL; and a complete listing of the technology rankings for all the areas covered by the diagram.

1993-06-30

382

Diagram of the uranium prospection perforation  

International Nuclear Information System (INIS)

We call diagrams to the drawn up one continuous of parameters physicists of the formation trimmed by a perforation based on the depth. The method is interesting not only for the putting in evidence of the mineralized levels but also it stops to determine the variations of lithology had by one part to the intrinsic properties of minerals (quartz, clays, carbonates) and to their variation of tenor and by another one, to variations of porosity and permeability of the formation

1982-01-01

383

Improving Stochastic Estimator Techniques for Disconnected Diagrams  

CERN Multimedia

Disconnected diagrams are expected to be sensitive to the inclusion of dynamical fermions. We present a feasibility study for the observation of such effects on the nucleonic matrix elements of the axial vector current, using SESAM full QCD vacuum configurations with Wilson fermions on $16^3\\times 32$ lattices, at $\\beta =5.6$. Starting from the standard methods developed by the Kentucky and Tsukuba groups, we investigate the improvement from various refinements thereof.

Viehoff, J; Güsken, S; Hoeber, H; Lacock, P; Lippert, T; Schilling, K; Spitz, A; Überholz, P; Lippert, Th.

1998-01-01

384

Drawing Tree Diagrams: Problems and Suggestions  

Directory of Open Access Journals (Sweden)

Full Text Available Starting from the theoretical goal of syntax, and taking the difference between pedagogical grammar and syntax into consideration, this article, based on the author’s teaching practice and review of exam papers, analyzes common problems in drawing tree diagrams such as ternary branching and improper marking of grammatical categories, followed by proposals for constructing such representations, with a view to helping students to achieve reasonable and elegant drawings, and also to helping teachers to teach syntax more fruitfully.

Qiang Wang

2010-01-01

385

Quark triangle diagrams and radiative meson decays  

International Nuclear Information System (INIS)

The radiative meson decays V ? P? and P ? ?? are analysed using the quark triangle diagram. Experimental date yield well determined estimates of the universal quark-antiquark-meson couplings gVqq'-bar and gPqq'-bar for the light meson sector. Also predictions for the ratios of neutral to charged heavy meson decay coupling constants are given and await experimental confirmation. 8 refs., 3 tabs., 2 figs.

1997-01-01

386

Quark triangle diagrams and radiative meson decays  

Energy Technology Data Exchange (ETDEWEB)

The radiative meson decays V {yields} P{gamma} and P {yields} {gamma}{gamma} are analysed using the quark triangle diagram. Experimental date yield well determined estimates of the universal quark-antiquark-meson couplings g{sub Vqq}`-bar and g{sub Pqq}`-bar for the light meson sector. Also predictions for the ratios of neutral to charged heavy meson decay coupling constants are given and await experimental confirmation. 8 refs., 3 tabs., 2 figs.

Liu, Dongsheng; Jones, N.R. [Tasmania Univ., Sandy Bay, TAS (Australia)

1997-06-01

387

Homotopy coherent diagrams and approximate fibrations  

CERN Multimedia

Let p be a fibration over a finite simplicial complex, whose fibers have the homotopy type of finite simplicial complexes. Then p is equivalent to an approximate fibration whose total space is a compact ENR. The proof uses homotopy coherent diagrams and their homotopy colimits. We also comment on the simple homotopy type of the total space and give an application to the fibering of Hilbert cube manifolds.

Steimle, Wolfgang

2011-01-01

388

Phase Diagrams of Strongly Interacting Theories  

DEFF Research Database (Denmark)

We summarize the phase diagrams of SU, SO and Sp gauge theories as function of the number of flavors, colors, and matter representation as well as the ones of phenomenologically relevant chiral gauge theories such as the Bars-Yankielowicz and the generalized Georgi-Glashow models. We finally report on the intriguing possibility of the existence of gauge-duals for nonsupersymmetric gauge theories and the impact on their conformal window.

Sannino, Francesco

2010-01-01

389

Cyclic operads and algebra of chord diagrams  

CERN Multimedia

We prove that the algebra $\\cal{A}$ of chord diagrams, the dual to the associated graded algebra of Vassiliev knot invariants, is isomorphic to the universal enveloping algebra of a Casimir Lie algebra in a certain tensor category (the PROP for Casimir Lie algebras). This puts on a firm ground a known statement that the algebra $\\cal{A}$ ``looks and behaves like a universal enveloping algebra''. An immediate corollary of our result is the conjecture of Bar-Natan, Garoufalidis, Rozansky, and Thurston on the Kirillov-Duflo isomorphism for algebras of chord diagrams. Our main tool is a general construction of a functor from the category $\\mathtt{CycOp}$ of cyclic operads to the category $\\mathtt{ModOp}$ of modular operads which is left adjoint to the ``tree part'' functor $\\mathtt{ModOp} \\to \\mathtt{CycOp}$. The algebra of chord diagrams arises when this construction is applied to the operad for Lie algebras. Another example of this construction is Kontsevich's graph complex that corresponds to the operad for ho...

Hinich, V; Hinich, Vladimir; Vaintrob, Arkady

2000-01-01

390

Refined phase diagram of boron nitride  

Energy Technology Data Exchange (ETDEWEB)

The equilibrium phase diagram of boron nitride thermodynamically calculated by Solozhenko in 1988 has been now refined on the basis of new experimental data on BN melting and extrapolation of heat capacities of BN polymorphs into high-temperature region using the adapted pseudo-Debye model. As compared with the above diagram, the hBN {l_reversible} cBN equilibrium line is displaced by 60 K toward higher temperatures. The hBN-cBN-L triple point has been calculated to be at 3480 {+-} 10 K and 5.9 {+-} 0.1 GPa, while the hBN-L-V triple point is at T = 3400 {+-} 20 K and p = 400 {+-} 20 Pa, which indicates that the region of thermodynamic stability of vapor in the BN phase diagram is extremely small. It has been found that the slope of the cBN melting curve is positive whereas the slope of hBN melting curve varies from positive between ambient pressure and 3.4 GPa to negative at higher pressures.

Solozhenko, V.; Turkevich, V.Z. [National Academy of Sciences, Kiev (Ukraine). Inst. for Superhard Materials; Holzapfel, W.B. [Univ.-GH-Paderborn (Germany)

1999-04-15

391

On Path diagrams and Stirling permutations  

CERN Multimedia

Any ordinary permutation $\\tau\\in S_n$ of size $n$, written as a word $\\tau=\\tau_1...\\tau_n$, can be locally classified according to the relative order of $\\tau_j$ to its neighbours. This gives rise to four local order types called peaks (or maxima), valleys (or minima), double rises and double falls. By the correspondence between permutations and binary increasing trees the classification of permutations according to local types corresponds to a classification of binary increasing trees according to nodes types. Moreover, by the bijection between permutations, binary increasing trees and suitably defined path diagrams one can obtain continued fraction representations of the ordinary generating function of local types. The aim of this work is to introduce the notion of local types in $k$-Stirling permutations, to relate these local types with nodes types in $(k+1)$-ary increasing trees and to obtain a bijection with suitably defined path diagrams. Furthermore, we also present a path diagram representation of ...

Kuba, Markus

2009-01-01

392

On diagram-chasing in double complexes  

CERN Document Server

Diagram-chasing arguments frequently lead to "magical" relations between distant points of diagrams: exactness implications, connecting morphisms, etc.. These long connections are usually composites of short "unmagical" connections, but the latter, and the objects they join, are not visible in the proofs. I try to remedy this situation. Given a double complex in an abelian category, we consider, for each object A of the complex, the familiar horizontal and vertical homology objects at A, and two other objects, which we name the "donor" A_{\\box} and and the "receptor" ^{\\box}A at A. For each arrow of the double complex, we prove the exactness of a 6-term sequence of these objects (the "Salamander Lemma"). Standard results such as the 3x3-Lemma, the Snake Lemma, and the long exact sequence of homology associated with a short exact sequence of complexes, are obtained as easy applications of this lemma. We then obtain some generalizations of the last of the above examples, getting various exact diagrams from doub...

Bergman, George M

2011-01-01

393

Refined phase diagram of boron nitride  

International Nuclear Information System (INIS)

[en] The equilibrium phase diagram of boron nitride thermodynamically calculated by Solozhenko in 1988 has been now refined on the basis of new experimental data on BN melting and extrapolation of heat capacities of BN polymorphs into high-temperature region using the adapted pseudo-Debye model. As compared with the above diagram, the hBN left-reversible cBN equilibrium line is displaced by 60 K toward higher temperatures. The hBN-cBN-L triple point has been calculated to be at 3480 ± 10 K and 5.9 ± 0.1 GPa, while the hBN-L-V triple point is at T = 3400 ± 20 K and p = 400 ± 20 Pa, which indicates that the region of thermodynamic stability of vapor in the BN phase diagram is extremely small. It has been found that the slope of the cBN melting curve is positive whereas the slope of hBN melting curve varies from positive between ambient pressure and 3.4 GPa to negative at higher pressures

1999-04-15

394

MDM: A Mode Diagram Modeling Framework  

DEFF Research Database (Denmark)

Periodic control systems used in spacecrafts and automotives are usually period-driven and can be decomposed into different modes with each mode representing a system state observed from outside. Such systems may also involve intensive computing in their modes. Despite the fact that such control systems are widely used in the above-mentioned safety-critical embedded domains, there is lack of domain-specific formal modelling languages for such systems in the relevant industry. To address this problem, we propose a formal visual modeling framework called mode diagram as a concise and precise way to specify and analyze such systems. To capture the temporal properties of periodic control systems, we provide, along with mode diagram, a property specification language based on interval logic for the description of concrete temporal requirements the engineers are concerned with. The statistical model checking technique can then be used to verify the mode diagram models against desired properties. To demonstrate the viability of our approach, we have applied our modelling framework to some real life case studies from industry and helped detect two design defects for some spacecraft control systems.

Wang, Zheng; Pu, Geguang

2012-01-01

395

V-Diagram Applications On Chosen Subjects In Chemistry Education  

Directory of Open Access Journals (Sweden)

Full Text Available Based on the above mentioned significance of using Vee diagram applications in laboratories, the answer to the question, “Does using Vee diagrams in selected topics in laboratories contribute to education and instruction as well as meaningful learning?” is explored. In the study, the “concept mapping” and the 16-item scale used to identify “attitudes towards the use of Vee diagrams” developed by Okebukola (1992) and “attitude scale towards chemistry laboratory” developed by researchers were used to seek answers to the following questions:“What are students’ attitudes towards chemistry laboratories?”“What are their attitudes towards the utilization of concept maps and Vee diagrams?”“Does using Vee diagrams contribute to student success?"“Do the attitudes of students towards chemistry laboratories and towards the utilization of concept maps and Vee diagrams correlate?“Is there a relation between their attitudes towards chemistry laboratories, towards the use of Vee diagrams and their success?Making students comprehend Vee diagrams, implementing Vee diagram applications for various chemistry experiments done in fundamental chemistry laboratories, providing the necessary tools to eliminate the possible challenges that students may encounter as they are preparing Vee diagrams, and identifying whether Vee diagrams contribute to conceptual teaching are among the objectives of this study.

?nci MORG?L; Nilgün SEÇKEN; Zuhal KARAÇUHA

2005-01-01

396

Summation of Parquet diagrams as an ab initio method in nuclear structure calculations  

International Nuclear Information System (INIS)

Research highlights: ? We present a Green's function based approach for doing ab initio nuclear structure calculations. ? In particular the sum the subset of so-called Parquet diagrams. ? Applying the theory to a simple but realistic model, results in good agreement with other ab initio methods. ? This opens up for ab initio calculations for medium-heavy nuclei. - Abstract: In this work we discuss the summation of the Parquet class of diagrams within Green's function theory as a possible framework for ab initio nuclear structure calculations. The theory is presented and some numerical details are discussed, in particular the approximations employed. We apply the Parquet method to a simple model, and compare our results with those from an exact solution. The main conclusion is that even at the level of approximation presented here, the results shows good agreement with other comparable ab initio approaches.

2011-01-01

397

The efficiency and effectiveness of utilizing diagrams in interviews: an assessment of participatory diagramming and graphic elicitation  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background This paper focuses on measuring the efficiency and effectiveness of two diagramming methods employed in key informant interviews with clinicians and health care administrators. The two methods are 'participatory diagramming', where the respondent creates a diagram that assists in their communication of answers, and 'graphic elicitation', where a researcher-prepared diagram is used to stimulate data collection. Methods These two diagramming methods were applied in key informant interviews and their value in efficiently and effectively gathering data was assessed based on quantitative measures and qualitative observations. Results Assessment of the two diagramming methods suggests that participatory diagramming is an efficient method for collecting data in graphic form, but may not generate the depth of verbal response that many qualitative researchers seek. In contrast, graphic elicitation was more intuitive, better understood and preferred by most respondents, and often provided more contemplative verbal responses, however this was achieved at the expense of more interview time. Conclusion Diagramming methods are important for eliciting interview data that are often difficult to obtain through traditional verbal exchanges. Subject to the methodological limitations of the study, our findings suggest that while participatory diagramming and graphic elicitation have specific strengths and weaknesses, their combined use can provide complementary information that would not likely occur with the application of only one diagramming method. The methodological insights gained by examining the efficiency and effectiveness of these diagramming methods in our study should be helpful to other researchers considering their incorporation into qualitative research designs.

Umoquit Muriah J; Dobrow Mark J; Lemieux-Charles Louise; Ritvo Paul G; Urbach David R; Wodchis Walter P

2008-01-01

398

Approximating Cayley diagrams versus Cayley graphs  

CERN Multimedia

We construct a sequence of finite graphs that weakly converge to a Cayley graph, but there is no labelling of the edges that would converge to the corresponding Cayley diagram. A similar construction is used to give graph sequences that converge to the same limit, and such that a spanning tree in one of them has a limit that is not approximable by any subgraph of the other. We give an example where this subtree is a Hamiltonian cycle, but convergence is meant in a stronger sense. These latter are related to whether having a Hamiltonian cycle is a testable graph property.

Timar, Adam

2011-01-01

399

Phase diagram of diblock polyampholyte solutions  

CERN Multimedia

We discuss in this paper the phase diagram of a diblock polyampholyte solution in the limit of high ionic strength as a function of concentration and charge asymmetry. This system is shown to be very similar to solutions of so-called charged-neutral diblock copolymers: at zero charge asymmetry the solution phase separates into a polyelectrolyte complex and almost pure solvent. Above a charge asymmetry threshold, the copolymers are soluble as finite size aggregates. Scaling laws of the aggregates radius as a function of pH of the solution are in qualitative agreement with experiments.

Castelnovo, M; Castelnovo, Martin

2001-01-01

400

Improving Web Database Access Using Decision Diagrams  

CERN Multimedia

In some areas of management and commerce, especially in Electronic commerce (E-commerce), that are accelerated by advances in Web technologies, it is essential to support the decision making process using formal methods. Among the problems of E-commerce applications: reducing the time of data access so that huge databases can be searched quickly; decreasing the cost of database design ... etc. We present the application of Decision Diagrams design using Information Theory approach to improve database access speeds. We show that such utilization provides systematic and visual ways of applying Decision Making methods to simplify complex Web engineering problems.

Popel, D V; Popel, Denis V.; Al-Hakeem, Nawar

2002-01-01

 
 
 
 
401

Finite Temperature Phase Diagrams of Gauge Theories  

CERN Document Server

We discuss finite temperature phase diagrams of SU(N) gauge theory with massless fermions as a function of the number of fermion flavors. Inside the conformal window we find a phase boundary separating two different conformal phases. Below the conformal window we find different phase structures depending on if the beta function of the theory has a first or higher order zero at the lower boundary of the conformal window. We also outline how the associated behaviors will help in distinguishing different types of theories using lattice simulations.

Tuominen, Kimmo

2012-01-01

402

The QCD Phase Diagram with Effective Theories  

CERN Document Server

We study two effective theories for QCD at non-zero temperature and finite chemical potential, using local Polyakov loops as the degrees of freedom. The sign problem is solved by exactly mapping the partition function to a sum over flux and monomer variables with only real and positive weights, making the two models accessible to Monte Carlo simulation techniques. We use generalized worm algorithms and a local Metropolis update to perform the simulations and determine the phase diagram as a function of the temperature and the chemical potential.

Delgado, Ydalia; Gattringer, Christof; Göschl, Daniel

2011-01-01

403

Phase diagram of a Schelling segregation model  

CERN Document Server

The collective behavior in a variant of Schelling's segregation model is characterized with methods borrowed from statistical physics, in a context where their relevance was not conspicuous. A measure of segregation based on cluster geometry is defined and several quantities analogous to those used to describe physical lattice models at equilibrium are introduced. This physical approach allows to distinguish quantitatively several regimes and to characterize the transitions between them, leading to the building of a phase diagram. Some of the transitions evoke empirical sudden ethnic turnovers. We also establish links with 'spin-1' models in physics. Our approach provides generic tools to analyze the dynamics of other socio-economic systems.

Gauvin, Laetitia; Nadal, Jean-Pierre

2009-01-01

404

The phase diagram of the solid methanes  

International Nuclear Information System (INIS)

A comparative study is presented of the phase diagrams of the solid methanes CH4, CH3D, CH2D2, CHD3, and CD4 obtained experimentally using NMR techniques at pressures up to 9 kbar. Polynomial representations of the I-II, I-III and II-III phase transition lines are given. The experimental conditions under which solid methane transforms to phase IV are discussed and polynomial representations of the I-IV, the IV-I, and the IV-II transition lines are also given

1989-01-01

405

Experimental and Numerical Analysis of Forming Limit Diagram (FLD) and Forming Limit Stress Diagram (FLSD)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In this work, forming limit diagram for aluminum alloy 3105 is performed experimentally and forming limit based on stress (FLSD) calculated from strains that resulted from experimental procedure. In addition, numerical prediction by ductile fracture criteria using simulation is considered and it is ...

Mehdi Safari; Seyed Jamal Hosseinipour; Hamed Deilami Azodi

406

Magnetic phase diagrams of UNiGe  

Energy Technology Data Exchange (ETDEWEB)

UNiGe undergoes two magnetic transitions in zero field. Here, the magnetic diagrams of UNiGe for B {parallel} b and B {parallel} c are reported. We performed temperatures scans of the magnetization in static magnetic fields up to 19.5T applied along the b and c axes. For both orientations 3 magnetic phases have been identified in the B-T diagrams. We confirmed the previously reported phase boundaries for B {parallel} c, and in addition we determined the location of the phase boundaries for B {parallel} b. We discuss a possible relationship of the two zero-field antiferromagnetic phases (commensurate: T<42K; incommensurate: 42K

Nakotte, H. [Los Alamos National Lab., NM (United States); Hagmusa, I.H.; Klaasse, J.C.P. [Univ. of Amsterdam (Netherlands). Van der Waals-Zeeman Inst.; Nakotte, H.; Lacerda, A.H. [Los Alamos National Lab., NM (United States); Hagmusa, I.H.; Klaasse, J.C.P. [Univ. of Amsterdam (Netherlands). Van der Waals-Zeeman Institute] [and others

1997-11-01

407

Oak Ridge National Laboratory Technology Logic Diagram  

International Nuclear Information System (INIS)

The Oak Ridge National Laboratory Technology Logic Diagram (TLD) was developed to provide a decision support tool that relates environmental restoration (ER) and waste management (WM) problems at Oak Ridge National Laboratory (ORNL) to potential technologies that can remediate these problems. The TLD consists of three fundamentally separate volumes: Vol. 1, Technology Evaluation; Vol. 2, Technology Logic Diagram; and Vol. 3, Technology Evaluation Data Sheets. Part A of Vols. 1 and 2 focuses on RA. Part B of Vols. 1 and 2 focuses on the D ampersand D of contaminated facilities. Part C of Vols. 1 and 2 focuses on WM. Each part of Vol. 1 contains an overview of the TLD, an explanation of the problems facing the volume-specific program, a review of identified technologies, and rankings of technologies applicable to the site. Volume 2 (Pts. A, B, and C) contains the logic linkages among EM goals, environmental problems, and the various technologies that have the potential to solve these problems. Volume 3 (Pts. A, B,and C) contains the TLD data sheets. This volume provides the technology evaluation data sheets (TEDS) for ER/WM activities (D ampersand D, RA, and WM) that are referenced by a TEDS code number in Vol. 2 of the TLD. Each of these sheets represents a single logic trace across the TLD. These sheets contain more detail than is given for the technologies in Vol. 2. The data sheets are arranged alphanumerically by the TEDS code number in the upper right comer of each sheet

1993-01-01

408

Using influence diagrams for data worth analysis  

International Nuclear Information System (INIS)

Decision-making under uncertainty describes most environmental remediation and waste management problems. Inherent limitations in knowledge concerning contaminants, environmental fate and transport, remedies, and risks force decision-makers to select a course of action based on uncertain and incomplete information. Because uncertainties can be reduced by collecting additional data., uncertainty and sensitivity analysis techniques have received considerable attention. When costs associated with reducing uncertainty are considered in a decision problem, the objective changes; rather than determine what data to collect to reduce overall uncertainty, the goal is to determine what data to collect to best differentiate between possible courses of action or decision alternatives. Environmental restoration and waste management requires cost-effective methods for characterization and monitoring, and these methods must also satisfy regulatory requirements. Characterization and monitoring activities imply that, sooner or later, a decision must be made about collecting new field data. Limited fiscal resources for data collection should be committed only to those data that have the most impact on the decision at lowest possible cost. Applying influence diagrams in combination with data worth analysis produces a method which not only satisfies these requirements but also gives rise to an intuitive representation of complex structures not possible in the more traditional decision tree representation. This paper demonstrates the use of influence diagrams in data worth analysis by applying to a monitor-and-treat problem often encountered in environmental decision problems.

1997-01-01

409

Interactive Cost Configuration Over Decision Diagrams  

DEFF Research Database (Denmark)

In many AI domains such as product configuration, a user should interactively specify a solution that must satisfy a set of constraints. In such scenarios, offline compilation of feasible solutions into a tractable representation is an important approach to delivering efficient backtrack-free user interaction online. In particular,binary decision diagrams (BDDs) have been successfully used as a compilation target for product and service configuration. In this paper we discuss how to extend BDD-based configuration to scenarios involving cost functions which express user preferences. We first show that an efficient, robust and easy to implement extension is possible if the cost function is additive, and feasible solutions are represented using multi-valued decision diagrams (MDDs). We also discuss the effect on MDD size if the cost function is non-additive or if it is encoded explicitly into MDD. We then discuss interactive configuration in the presence of multiple cost functions. We prove that even in its simplest form, multiple-cost configuration is NP-hard in the input MDD. However, for solving two-cost configuration we develop a pseudo-polynomial scheme and a fully polynomial approximation scheme. The applicability of our approach is demonstrated through experiments over real-world configuration models and product-catalogue datasets. Response times are generally within a fraction of a second even for very large instances.

Andersen, Henrik Reif; Hadzic, Tarik

2010-01-01

410

Phase diagram of quantum square ice  

Science.gov (United States)

We have investigated the ground-state and finite-temperature phase diagram of quantum square ice - realized by the transverse-field Ising model on a checkerboard lattice - using both linear spin-wave (LSW) theory and quantum Monte Carlo (QMC). We generalize the model with different couplings between nearest (J1) and next-to-nearest (J2) neighbors on the checkerboard lattice. Our QMC approach generalizes the loop algorithm - very efficient in the study of constrained classical systems - to a ``brane algorithm'' for quantum systems. At the LSW level the vast degeneracy of the ground-state for J1=J2 and J2>J1 remains intact; moreover LSW theory breaks down in extended regions of the phase diagram, pointing at non-classical states [1]. Our QMC study goes beyond perturbative schemes and addresses directly the nature of the low-temperature phases. We have critically examined the possibility of a resonating-plaquette state for J1=J2, suggested by degenerate perturbation theory on the ice-rule manifold for weak fields. Our QMC results for finite fields confirm the absence of Néel or collinear order, but they do not confirm the presence of resonating-plaquette order, pointing at a possibly more complex non-classical state.[4pt] [1] L.-P. Henry et al., PRB 85, 134427 (2012).

Henry, Louis-Paul; Holdsworth, Peter; Mila, Frederic; Roscilde, Tommaso

2013-03-01

411

Total Cofibres of Diagrams of Spectra  

CERN Multimedia

If Y is a diagram of spectra indexed by an arbitrary poset C together with a specified sub-poset D, we define the total cofibre \\Gamma (Y) of Y as the strict cofibre of the map from hocolim_D (Y) to hocolim_C (Y). We construct a comparison map from the homotopy limit of Y to a looping of a fibrant replacement of Gamma (Y), and characterise those poset pairs (C,D) for which this comparison map is a stable equivalence. The characterisation is given in terms of stable cohomotopy of spaces related to C and D. For example, if C is a finite polytopal complex with underlying space an m-ball with boundary sphere D, then holim_C (Y) and \\Gamma(Y) agree up to m-fold looping and up to stable equivalence. As an application of the general result we give a spectral sequence for the homotopy groups of \\Gamma(Y) with E_2-term involving higher derived inverse limits of \\pi_* (Y), generalising earlier constructions for space-valued diagrams indexed by the face lattice of a polytope.

Huettemann, T

2005-01-01

412

Projecting onto Qubit Irreps of Young Diagrams  

CERN Multimedia

Let K be the diagonal subgroup of U(2)^{(x)n}. We may view the one-qubit state-space H_1 as a standard representation of U(2) and the n-qubit state space H_n=(H_1)^{(x) n} as the n-fold tensor product of standard representations. Representation theory then decomposes H_n into irreducible subrepresentations of K parametrized by combinatorial objects known as Young diagrams. We argue that n-1 classically controlled measurement circuits, each a Fredkin-gate interferometer, may be used to form a projection operator onto a random Young diagram irrep within H_n. For H_2, the two irreps happen to be orthogonal and correspond to the symmetric and wedge product. The latter is spanned by ket{Psi^-}, and the standard two-qubit swap interferometer requiring a single Fredkin gate suffices in this case. In the n-qubit case, it is possible to extract many copies of ket{Psi^-}. Thus applying this process using nondestructive Fredkin interferometers allows for the creation of entangled bits (e-bits) using fully mixed states a...

Bullock, S S

2006-01-01

413

The Ni-Ge-Sn phase diagram  

Energy Technology Data Exchange (ETDEWEB)

Details of phase relationships in the ternary system Ni-Ge-Sn are presented. Isothermal sections have been determined at 873 K, 973 K, 1073 K, 1173 K and 1273 K, and a reaction sequence diagram has been established. {delta} phases of Ni{sub 5}Ge{sub 3} and Ni{sub 3}Sn{sub 2} with B8{sub 2} structure forms a continuous solid solution up to its melting point and the section of Ni{sub 5}Ge{sub 3}-Ni{sub 3}Sn{sub 2} is regarded as pseudobinary. It is characteristic of the Ni-Ge-Sn ternary diagram that is separated by the two pseudobinary systems Ni{sub 3}Ge-Ni{sub 3}Sn and Ni{sub 5}Ge{sub 3}-Ni{sub 3}Sn{sub 2} into three independent portions. In the Ni-Ge-Sn ternary system, any other ternary compound has not been found except the {gamma}{sub 2}' phase having L1{sub 2} crystal structure. (orig.).

Wang Kun (Tokyo Inst. of Tech. (Japan). Dept. of Materials Science and Engineering); Nishikata, Atsushi; Suzuki, Tomoo (Tokyo Inst. of Tech. (Japan). Dept. of Metallurgical Engineering); Mishima, Yoshinao (Tokyo Inst. of Tech. (Japan). Research Lab. of Precision Machinery and Electronics)

1990-12-01

414

Multiple Reggeon exchange from summing QCD Feynman diagrams  

International Nuclear Information System (INIS)

Multiple Reggeon exchange supplies subleading logarithms that may be used to restore unitarity to the Low-Nussinov Pomeron, provided it can be proven that the sum of Feynman diagrams to all orders gives rise to such multiple Regge exchanges. This question cannot be easily tackled in the usual way except for very low-order diagrams, on account of delicate cancellations present in the sum which necessitate individual Feynman diagrams to be computed to subleading orders. Moreover, it is not clear that sums of high-order Feynman diagrams with complicated crisscrossing of lines can lead to factorization implied by the multi-Regge scenario. Both of these difficulties can be overcome by using the recently developed non-Abelian cut diagrams. We are then able to show that the sum of s-channel-ladder diagrams to all orders does lead to such multiple Reggeon exchanges. copyright 1997 The American Physical Society.

1997-01-01

415

Generalized Ellingham diagrams for utilization in solid oxide fuel cells  

Directory of Open Access Journals (Sweden)

Full Text Available Generalized Ellingham diagram for the P-O-H and the Ni-P-OH systems have been constructed to investigate thermodynamically the chemical stability of nickel anode against the gaseous impurities containing phosphorous compounds. In the same way as the original Ellingham diagram, the oxygen potential is used as the vertical axis, while the temperature is adopted as horizontal axis. For the P-O-H system which contains many gaseous species, the dominant areas of gaseous species are displayed with a parameter of their partial pressure in an analogous way to the aqueous species in the Pourbaix diagram. The multicomponent Ellingham diagram for the Ni-P-O-H system was constructed in a similar manner to the multicomponent Pourbaix diagram. The obtained diagrams have been discussed to examine the reactivity of nickel anodes with phosphorus compounds in SOFCs in terms of operational variables such as temperature, oxygen potential, overpotential under the anode polarization and so on.

Kishimoto H.; Yamaji K.; Brito M.E.; Horita T.; Yokokawa H.

2008-01-01

416

Formalization of the Data Flow Diagram Rules for Consistency Check  

Directory of Open Access Journals (Sweden)

Full Text Available In system development life cycle (SDLC), a system model can be developed using Data Flow Diagram(DFD). DFD is graphical diagrams for specifying, constructing and visualizing the model of a system.DFD is used in defining the requirements in a graphical view. In this paper, we focus on DFD and itsrules for drawing and defining the diagrams. We then formalize these rules and develop the tool based onthe formalized rules. The formalized rules for consistency check between the diagrams are used indeveloping the tool. This is to ensure the syntax for drawing the diagrams is correct and strictly followed.The tool automates the process of manual consistency check between data flow diagrams.

Rosziati Ibrahim; Siow Yen Yen

2010-01-01

417

Formalization of the data flow diagram rules for consistency check  

CERN Document Server

In system development life cycle (SDLC), a system model can be developed using Data Flow Diagram (DFD). DFD is graphical diagrams for specifying, constructing and visualizing the model of a system. DFD is used in defining the requirements in a graphical view. In this paper, we focus on DFD and its rules for drawing and defining the diagrams. We then formalize these rules and develop the tool based on the formalized rules. The formalized rules for consistency check between the diagrams are used in developing the tool. This is to ensure the syntax for drawing the diagrams is correct and strictly followed. The tool automates the process of manual consistency check between data flow diagrams.

Ibrahim, Rosziati; 10.5121/ijsea.2010.1406

2010-01-01

418

Complexifiable characteristic classes  

CERN Document Server

We examine the topological characteristic cohomology classes of complexified vector bundles. In particular, all the classes coming from the real vector bundles underlying the complexification are determined.

Rahm, Alexander D

2011-01-01

419

Solubility diagram of the Cu-Ni nanosystem  

International Nuclear Information System (INIS)

The application of equilibrium thermodynamics to a nanosystem changes Gibbs's rule of geometrical thermodynamics. This fact leads to the necessity to reconsider the phase diagram and solubility curve concepts. The notions of 'solubility diagram', 'solidus', 'liquidus' are used to discuss the case of phase transition in Cu-Ni nanoparticles. It is shown that, in the limit where thermodynamic arguments remain valid, the solubility diagrams of nanoparticles are functions of their size and nucleation mode. This is demonstrated for different sizes.

2006-03-01

420

Sequential influence diagrams : a unified asymmetry framework  

DEFF Research Database (Denmark)

We describe a new graphical language for specifying asymmetric decision problems. The language is based on a filtered merge of several existing languages including sequential valuation networks, asymmetric influence diagrams, and unconstrained influence diagrams. Asymmetry is encoded using a structure resembling a clustered decision tree, whereas the representation of the uncertainty model is based on the (unconstrained) influence diagram framework. We illustrate the proposed language by modeling several highly asymmetric decision problems, and we describe an efficient solution procedure. Udgivelsesdato: MAY

Jensen, Finn Verner; Nielsen, Thomas Dyhre

2006-01-01

 
 
 
 
421

A Formal Model for Data Flow Diagram Rules  

Directory of Open Access Journals (Sweden)

Full Text Available A formal model for data flow diagram (DFD) rules is developed by introducing a syntax and semantics for its rules. DFD has been chosen because it is an approach for specifying, constructing and visualizing the model of a system graphically and has been in practical use on a very wide basis but still lacks formal and precise understanding. This formal model can be used to check the correctness of the diagrams and consistency among the diagrams.

Rosziati Ibrahim; Siow Yen Yen

2011-01-01

422

UML modelling of geographic routing protocol "Greedy Perimeter Stateless Routing" for its integration into the "Java Network Simulator"  

CERN Multimedia

In this work we propose an UML modeling of the "Greedy Perimeter Stateless Routing" (GPSR) protocol that integrate this geographic routing protocol, into "JavaNetwork Simulator" to simulate and study this protocol in a first time and offer some improvement in these features. Java Network Simulator (JNS) is a project of "translation" of Network Simulator (NS) in Java initiated by "the UCL Department of Computer Science". This simulator is not as complete as ns-2, but it is much more accessible to programmers unfamiliar with Tcl. Java Network Simulator does not support so far, no routing protocol for vehicular ad hoc networks and all the routing decisions are made statically or using RIP and OSPF. By modeling and integrating the routing protocol GPSR to JNS, users will be able to understand the concept of the geographic routing and how the routing information is transmitted and updated between nodes in vehicular ad hoc network. The article first examines the architecture of the Java Network Simulator, then give...

Erritali, Mohammed; Ouahidi, Bouabid El

2012-01-01

423

Modelling of Signal - Level Crossing System  

Directory of Open Access Journals (Sweden)

Full Text Available The author presents an object-oriented model of a railway level-crossing system created for the purpose of functional requirements specification. Unified Modelling Language (UML), version 1.4, which enables specification, visualisation, construction and documentation of software system artefacts, was used. The main attention was paid to analysis and design phases. The former phase resulted in creation of use case diagrams and sequential diagrams, the latter in creation of class/object diagrams and statechart diagrams.

Daniel Novak

2006-01-01

424

Noniterative isobar diagrams and their effect in NN scattering  

Energy Technology Data Exchange (ETDEWEB)

The fourth-order noniterative diagrams involving nucleon-isobar intermediate states and including ..pi.. exchange are calculated in momentum space in the framework of noncovariant perturbation theory. A potential model is presented which includes, apart from these diagrams, suitable one-boson-exchange terms and iterative isobar diagrams involving N..delta..- and ..delta delta..-intermediate states, considering ..pi.. and rho exchange for the transition potentials. Finally, noniterative two-..pi..-exchange diagrams involving two-nucleon intermediate states are also taken into account. Such a model is able to describe NN scattering phase shifts satisfactorily. The role of the different parts of the potential model in NN scattering is studied.

Holinde, K.; Machleidt, R.; Faessler, A.; Muether, H.; Anastasio, M.R.

1981-09-01

425

Conformal and projection diagrams in LaTeX  

CERN Multimedia

In general relativity, the causal structure of space-time may sometimes be depicted by conformal Carter-Penrose diagrams or a recent extension of these - the projection diagrams. The introduction of conformal diagrams in the sixties was one of the progenitors of the golden age of relativity. They are the key ingredient of many scientific papers. Unfortunately, drawing them in the form suitable for LaTeX documents is time-consuming and not easy. We present below a library that allows one to draw an arbitrary conformal diagram in a few simple steps.

Ölz, Christa R

2013-01-01

426

Ways to measure the hairpin diagram in charmed meson decays  

Energy Technology Data Exchange (ETDEWEB)

The possible presence of hairpin diagrams is analyzed in the model-independent quark-diagram scheme for two-body decays of charmed mesons. Current experimental data do not require the presence of hairpin diagrams in D{yields}VP (V: vector meson, P: pseudoscalar meson), in accordance with the OZI rule. However, there is a possible indication that they are important in the decay of D{yields}PP. The measurement of D{sub s}{sup +}{yields}{pi}{sup +}{eta}' is crucial to test the mechanism of hairpin diagrams. (orig.).

Chau, L.L. (California Univ., Davis, CA (United States). Dept. of Physics); Cheng, H.Y. (Academia Sinica, Nankang, Taipei (Taiwan). Inst. of Physics); Huang, T. (Academia Sinica, Beijing (China). Inst. of High Energy Physics)

1992-02-01

427

Phase diagram of ferromagnetic XY model with nematic coupling on a triangular lattice  

Science.gov (United States)

The phase diagram of a ferromagnetic XY model with a nematic coupling (coupling strength x) on a triangular lattice is studied by means of Monte Carlo simulation. The algebraic-magnetic order associated with Kosterlitz–Thouless (KT) transition is observed over the whole x range. In the large x region, the phase transition from the algebraic-magnetic order to the algebraic-nematic order occurs at TI. In addition, this phase transition can be scaled with the two-dimensional Ising critical exponents, demonstrating that the present system belongs to the universality class of Ising transition at TI.

Qi, K.; Qin, M. H.; Jia, X. T.; Liu, J.-M.

2013-08-01

428

Mass divergences in annihilation processes. I. Origin and nature of divergences in cut vacuum polarization diagrams  

International Nuclear Information System (INIS)

The origin of mass divergences in internal loop momentum integrals of cut vacuum polarization diagrams is investigated. It is found that loop momentum configurations which can give rise to mass divergences are of a severely limited form and have a direct interpretation in terms of physically realizable processes. A power-counting procedure suitable for estimating the nature of mass divergences is developed, and it is found that in a large class of field theories, cross sections smeared over a small region of phase space are at worst logarithmically divergent

1978-05-15

429

Object Oriented Data Modeling for Data Warehousing (An Extension of UML approach to study Hajj pilgrim’s private tour as a Case Study)  

Directory of Open Access Journals (Sweden)

Full Text Available We are all familiar with the growth rate of the public Web. Regardless of the metric used to measure its growthattached networks, servers, users or pages the growth rate continues to exhibit an exponential pattern. In the same vein, theadoption rate of intranet and extranet data warehouses (i.e., Web warehouses) has exhibited a similar pattern, although thepattern has lagged public adoption. While data warehouse and business intelligence vendors have offered Web-enabledversions. All over world there are hundreds of private tour operators (PTOs) managing tour for hajj pilgrims. According to thevisiting Indian Ministry 138,000 Indian pilgrims performed hajj during 2007.Out of above mentioned figure 110,000 throughthe Hajj committee and 38,000 through PTOs. In India there are about 397 registered PTOs up to 2007. We introduce theUML Profile for Modeling DWH Usage for modeling the different kinds of DWH usage on a conceptual level. It uses featuresof UML intended for the purpose of creating abstract, general models. The profile distinguishes four perspectives of usage,and allows to model details of the users. The UML Profile is applied to example illustrating Hajj pilgrims private tour.

Kamal Alaskar; Akhtar Shaikh

2009-01-01

430

Subsectors, Dynkin Diagrams and New Generalised Geometries  

CERN Document Server

We examine how generalised geometries can be associated with a labelled Dynkin diagram built around a gravity line. We present a series of new generalised geometries based on the groups $\\mathit{Spin}(d,d)\\times\\mathbb{R}^+$ for which the generalised tangent space transforms in a spinor representation of the group. In low dimensions these all appear in subsectors of maximal supergravity theories. The case $d=8$ provides a geometry for eight-dimensional backgrounds of M theory with only seven-form flux, which have not been included in any previous geometric construction. This geometry is also one of a series of "half-exceptional" geometries, which "geometrise" a six-form gauge field. In the appendix, we consider examples of other algebras appearing in gravitational theories and give a method to derive the Dynkin labels for the "section condition" in general. We argue that generalised geometry can describe restrictions and subsectors of many gravitational theories.

Strickland-Constable, Charles

2013-01-01

431

Influence Diagrams for Optimal Maintenance Planning  

DEFF Research Database (Denmark)

Over the last two decades Bayesian networks and influence diagrams have received notable attention within the field of artificial intelligence and expert systems. During the last few years the technology has been further developed for problem solving within other engineering fields. The objective of this study is to present a conceptual bayesian network model for probabilistic prediction of fatigue crack growth in welded steel tubes. It is shown that despite discretization of the variable domain, the prediction is in good agreement with results obtained by the well-established structural reliability methods FORM/SORM. The Bayesian network model is argumented by decision and utility nodes, thus forming a full decision model for inspection planning. With the applied program package the optimal inspection plan is easily obtained. Moreover, the updating facilities allow for fast changes of the inspection plan when new knowledge becomes availabe.

Friis-Hansen, Andreas

2000-01-01

432

Bayesian Image Reconstruction Based on Voronoi Diagrams  

CERN Document Server

We present a Bayesian Voronoi image reconstruction technique (VIR) for interferometric data. Bayesian analysis applied to the inverse problem allows us to derive the a-posteriori probability of a novel parameterization of interferometric images. We use a variable Voronoi diagram as our model in place of the usual fixed pixel grid. A quantization of the intensity field allows us to calculate the likelihood function and a-priori probabilities. The Voronoi image is optimized including the number of polygons as free parameters. We apply our algorithm to deconvolve simulated interferometric data. Residuals, restored images and chi^2 values are used to compare our reconstructions with fixed grid models. VIR has the advantage of modeling the image with few parameters, obtaining a better image from a Bayesian point of view.

Cabrera, G F; Hitschfeld, N

2007-01-01

433

Improving perturbation theory with cactus diagrams  

CERN Multimedia

We study a systematic improvement of perturbation theory for gauge fields on the lattice [hep-lat/0606001]; the improvement entails resumming, to all orders in the coupling constant, a dominant subclass of tadpole diagrams. This method, originally proposed for the Wilson gluon action, is extended here to encompass all possible gluon actions made of closed Wilson loops; any fermion action can be employed as well. The effect of resummation is to replace various parameters in the action (coupling constant, Symanzik and clover coefficient) by ``dressed'' values; the latter are solutions to certain coupled integral equations, which are easy to solve numerically. Some positive features of this method are: a) It is gauge invariant, b) it can be systematically applied to improve (to all orders) results obtained at any given order in perturbation theory, c) it does indeed absorb in the dressed parameters the bulk of tadpole contributions. Two different applications are presented: The additive renormalization of fermio...

Constantinou, M; Skouroupathis, A; Constantinou, Martha; Panagopoulos, Haralambos; Skouroupathis, Apostolos

2006-01-01

434

Transformation of BPMN Diagrams to YAWL Nets  

Directory of Open Access Journals (Sweden)

Full Text Available Business Process Modeling Notation (BPMN) is the de facto standard for modeling business processes on a conceptual level. However, BPMN lacks a formal semantics and many of its features need to be further interpret, Consequently that hinders  BPMN as a standard to statically check the semantic correctness of models. YAWL (Yet Another Workflow Language) allows the specification of executable workflow models. A transformation between these two languages enables the integration of different levels of abstraction in process modeling. This paper discusses how to transform BPMN diagrams to YAWL nets. The benefits of the transformation are threefold. Firstly, it clarifies the semantics of BPMN via a mapping to YAWL. Secondly, the deployment of BPMN business process models is simplified. Thirdly, BPMN models can be analyzed with YAWL verification tools.

Jianhong Ye; Wen Song

2010-01-01

435

Cu - Te and Cr - Te phase diagrams  

International Nuclear Information System (INIS)

[en] The Cu - Te and Cr - Te phase diagrams were studied by means of differential thermal, X-ray diffraction and microstructural analyses. The crystallographic characteristics of the tellurides are given. Phase structures and lattice parameters are dependent on the method of preparation in large measure. The existence of the Cu2Te, Cu4Te3, CuTe and CrTe2 compounds are supported. Three last compounds show polymorphism. On the basis of CrTe2 the field of homogeneity was found. The lattice parameters of the low temperature CrTe2 modification are determined. The Cu3Te2 and CrTe3 compounds are not revealed[ru] ???????? ???????????????-????????????, ???????????????? ? ????????????????? ???????? ??????????? ????????? ????????? ?????? Cu - Te ? Cr - Te. ????????? ???????????????????? ?????????????? ??????????. ????????? ??? ? ????????? ???????????? ????? ? ???????????? ??????? ??????? ?? ??????? ?????????. ???????????? ????????????? ?????????? Cu2Te, Cu4Te3, CuTe ? CrTe2. ? ???? ????????? ?????????? ??????? ???????????. ?? ?????? CrTe2 ??????? ??????? ????????????. ?????????? ????????? ??????? ?????????????????? ??????????? CrTe2. ?????????? Cu3Te2 ? CrTe3 ?? ??????????

2001-01-01

436

The phase diagram of random threshold networks  

International Nuclear Information System (INIS)

Threshold networks are used as models for neural or gene regulatory networks. They show rich dynamical behaviour with a transition between a frozen phase and a chaotic phase. We investigate the phase diagram of randomly connected threshold networks with real-valued thresholds h and a fixed number of inputs per node. The nodes are updated according to the same rules as in a model of the cell-cycle network of Saccharomyces cereviseae (Li et al 2004 Proc. Natl Acad. Sci. USA 101 4781-6). Using the annealed approximation, we derive expressions for the time evolution of the proportion of nodes in the 'on' and 'off' states, and for the sensitivity ?. The results are compared with simulations of quenched networks. We find that for integer values of h the simulations show marked deviations from the annealed approximation even for large networks. This can be attributed to the particular choice of the updating rule.

2008-01-01

437

The Gamma Ray Bursts Hubble diagram  

CERN Multimedia

Thanks to their enormous energy release, Gamma Rays Bursts (GRBs) have recently attracted a lot of interest to probe the Hubble diagram (HD) deep into the matter dominated era and hence complement Type Ia Supernovae (SNeIa). We consider here three different calibration methods based on the use of a fiducial LCDM model, on cosmographic parameters and on the local regression on SNeIa to calibrate the scaling relations proposed as an equivalent to the Phillips law to standardize GRBs finding any significant dependence. We then investigate the evolution of these parameters with the redshift to obtain any statistical improvement. Under this assumption, we then consider possible systematics effects on the HDs introduced by the calibration method, the averaging procedure and the homogeneity of the sample arguing against any significant bias.

Capozziello, S; Dainotti, M G; De Laurentis, M; Izzo, L; Perillo, M

2011-01-01

438

A Hasse diagram for rational toral ranks  

CERN Multimedia

Let $X$ be a simply connected CW complex with finite rational cohomology. For the finite quotient set of rationalized orbit spaces of $X$ obtained by almost free toral actions, ${\\mathcal T}_0(X)=\\{[Y_i] \\}$, induced by an equivalence relation based on rational toral ranks, we order as $[Y_i]0$. It presents a variation of almost free toral actions on $X$. We consider about the Hasse diagram ${\\mathcal H}(X)$ of the poset ${\\mathcal T}_0(X)$, which makes a based graph $G{\\mathcal H}(X)$, with some examples. Finally we will try to regard $G{\\mathcal H}(X)$ as the 1-skeleton of a finite CW complex ${\\mathcal T}(X)$ with base point $X_{\\Q}$.

Yamaguchi, Toshihiro

2010-01-01

439

Thermal phase diagrams of columnar liquid crystals  

CERN Multimedia

In order to understand the possible sequence of transitions from the disordered columnar phase to the helical phase in hexa(hexylthio)triphenylene (HHTT), we study a three-dimensional planar model with octupolar interactions inscribed on a triangular lattice of columns. We obtain thermal phase diagrams using a mean-field approximation and Monte Carlo simulations. These two approaches give similar results, namely, in the quasi one-dimensional regime, as the temperature is lowered, the columns order with a linear polarization, whereas helical phases develop at lower temperatures. The helicity patterns of the helical phases are determined by the exact nature of the frustration in the system, itself related to the octupolar nature of the molecules.

Lamoureux, G; Sénéchal, D

1998-01-01

440

Possible phase diagrams of superconducting UPt3  

International Nuclear Information System (INIS)

We enumerate and discuss several possibilities for the split transition in UPt3 and the phase diagrams that result. We find that the splitting may be due to weak basal-plane spin-orbit coupling or a near degeneracy of E1 and A1 representations of the hexagonal group. A further possibility is that only the E1 representation is involved and is split by the coupling to antiferromagnetism, as suggested recently. However, as distinct from the previous results, we found that this coupling could lead to a superconducting glass phase if the antiferromagnetic domain size is small, as is observed. The implications of these ideas for the Hc2 curves are discussed, particularly the questions of the presence of the kink in the Hc2 curves and the isotropy of Hc2 in the basal plane

1990-08-01