WorldWideScience
1

Semantic annotation of requirements for automatic UML class diagram generation  

CERN Document Server

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

2

Diagram, a Learning Environment for Initiation to Object-Oriented Modeling with UML Class Diagrams  

Science.gov (United States)

This paper presents Diagram, a learning environment for object-oriented modelling (OOM) with UML class diagrams. Diagram an open environment, in which the teacher can add new exercises without constraints on the vocabulary or the size of the diagram. The interface includes methodological help, encourages self-correcting and self-monitoring, and…

Py, Dominique; Auxepaules, Ludovic; Alonso, Mathilde

2013-01-01

3

Extending UML Class Diagram Notation for the Development of Context-aware Applications  

Directory of Open Access Journals (Sweden)

Full Text Available The development of context-aware applications in a pervasive environment is a very hard work because each situation can be influenced by several factors and features such as users mobility, information heterogeneity and systems distribution. So, new application will be able to adapt its services with the change of context of use and satisfy all users’ preferences. In this work we present an UML class diagram extension for representing and modeling context because UML standard notation does not support all aspects of the context of use in an adequate manner. This extension is defined by some extensibility mechanisms and it is presented as a set of new tools for the unified modeling language. The proposed extension is based on UML notation and it permits obtaining a specific graphic representation of a contextual situation. Also, it facilitates the extraction and the modeling of all elements that can influence the current situation of the user. Our proposal consists on creating some stereotypes that are described by several tagged values and some constraints and that can be applied to the contextual model classes. Then we use a class diagram to describe the different types of context and their relationships. A case study is done in the medical domain in which we propose a new contextual model including all new stereotypes by using StarUML software modeling platform.

Mohamed Salah Benselim

2013-02-01

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Reverse Engineering: An Analysis of Static Behaviors of Object Oriented Programs by Extracting UML Class Diagram  

Directory of Open Access Journals (Sweden)

Full Text Available The Unified Modeling Language (UML has been accepted as a standard for modeling object oriented system. It helps the designer to understand a problem well by focusing on one aspects of a problem at a time. In this paper we present a novel approach in which reverse engineering is performed and we have chosen UML as the modeling language to achieve a representation of the implemented system. In this work we have considered java programs. After a brief introduction to the subject, we present some analyses which go beyond mere enumeration of methods and fields. We sketch a method which determines classes and their attribute, operation and relationship: generalization, aggregation, association and various kind of dependencies in form of a simple class diagram that can be understood by a programmer when inspecting the source code of a given java programs. To fully understand the behavior of a system, it is crucial to have efficient techniques to reverse static views of the system. In this paper, we focus on the reverse engineering to find UML class diagram from an object oriented system and analysis of its static behavior.

Mrinal Kanti Sarkar

2013-09-01

5

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

6

Identification and Check of Inconsistencies between UML Diagrams  

OpenAIRE

Relationships between Unified Modeling Language (UML) diagrams are complex. The complexity leads to inconsistencies between UML diagrams easily. This paper focus on how to identify and check inconsistencies between UML diagrams. 13 consistency rules are given to identify inconsistencies between the most frequent 6 types of UML diagrams in the domain of information systems analysis and design. These diagrams are as follows: Use Case Diagrams, Class Diagrams, Activity Diagrams, State Machine Di...

Xianhong Liu

2013-01-01

7

Identification and Check of Inconsistencies between UML Diagrams  

Directory of Open Access Journals (Sweden)

Full Text Available Relationships between Unified Modeling Language (UML diagrams are complex. The complexity leads to inconsistencies between UML diagrams easily. This paper focus on how to identify and check inconsistencies between UML diagrams. 13 consistency rules are given to identify inconsistencies between the most frequent 6 types of UML diagrams in the domain of information systems analysis and design. These diagrams are as follows: Use Case Diagrams, Class Diagrams, Activity Diagrams, State Machine Diagrams, Sequence Diagrams and Communication Diagrams. 4 methods are given to check inconsistencies between UML diagrams as follows: manual check, compulsory restriction, automatic maintenance, dynamic check. These rules and methods are helpful for developers to model information systems.

Xianhong Liu

2013-03-01

8

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 SciELO Colombia | Language: Spanish 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 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 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 refinem [...] ent 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-Relationship 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.

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

2007-11-01

9

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 SciELO Colombia | Language: Spanish 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 l [...] a 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. 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 rule [...] s 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 transformation. 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.

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

2007-03-01

10

On Class Diagrams, Crossings and Metrics  

OpenAIRE

As a standardized software engineering diagram, the UML class diagram provides various information on the static structure of views on software while design, implementation and maintenance phase. This talk gives an overview on drawing UML class diagrams in hierarchical fashion. Therefore, common elements of class diagrams are introduced and aesthetic rules for drawing UML class diagrams are given. These rules are based on four disciplines involved in the reading process of diagrams. After...

Eichelberger, Holger

2006-01-01

11

From State Diagram to Class Diagram  

DEFF Research Database (Denmark)

UML class diagram and Java source code are interrelated and Java code is a kind of interchange format. Working with UML state diagram in CASE tools, a corresponding xml file is maintained. Designing state diagrams is mostly performed manually using design patterns and coding templates - a time consuming process. This article demonstrates how to compile such a diagram into Java code and later, by reverse engineering, produce a class diagram. The process from state diagram via intermediate SAX parsed xml file to Apache Velocity generated Java code is described. The result is a fast reproducible Java code minimizing maintenance.

Borch, Ole; Madsen, Per Printz

2009-01-01

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Class structure of electromechanical energy converter models with UML-diagrams application  

Directory of Open Access Journals (Sweden)

Full Text Available Theoretical results are presented, mathematical model formation by means of inheritance from a generalized class template is shown for a general electromechanical energy converter.

V.Ye. Plyugin

2014-04-01

13

Review on Code Generation from UML Diagrams  

Directory of Open Access Journals (Sweden)

Full Text Available The Unified Modeling Language (UML [1] has now become the de-facto industry standard for objectoriented (OO software development. UML provides a set of diagrams to model structural and behavioral aspects of an object-oriented system[2,3].Automatic code generation is efficient which, in turn, helps the software engineers deliver the software on time. This paper represents an review for generating efficient and compact executable code from UML diagram. For this we first preprocess the given diagram for its correctness and then verify if for the same and then try to optimize the obtained diagram from these stages so as to reduce redundancies present in the diagram and finally generate the code for it.

Prajkta R. Pawde*1

2014-05-01

14

Case study: Class diagram restructuring  

OpenAIRE

This case study is an update-in-place refactoring transformation on UML class diagrams. Its aim is to remove clones of attributes from a class diagram, and to identify new classes which abstract groups of classes that share common data features. It is used as one of a general collection of transformations (such as the removal of redundant inheritance, or multiple inheritance) which aim to improve the quality of a specification or design level class diagram. The transf...

Lano, K.; Kolahdouz Rahimi, S.

2013-01-01

15

An Approach to Code Generation from UML Diagrams  

Directory of Open Access Journals (Sweden)

Full Text Available The Unified Modeling Language (UML has now become the de-facto industry standard for object-oriented (OO software development. UML provides a set of diagrams to model structural and behavioral aspects of an object-oriented system. Automatic translation of UML diagrams to object oriented code is highly desirable because it eliminates the chances of introduction of human errors in the translation process. Automatic code generation is efficient which, in turn, helps the software engineers deliver the software on time. However, major challenges in this area include checking consistency of UML models, and ensuring accuracy, maintainability, and efficiency of the generated code. This paper represents an approach to generate efficient and compact executable code from UML diagram. By analyzing the characteristics UML diagram, a coding strategy is proposed, and a structure identification and coding algorithm are put forward for code generation from UML diagram. Based on the coding strategy an algorithm is proposed to generate code from UML diagrams using some intermediate steps. The main objective of this paper is to generate the code from UML diagram.

Harshal D. Gurad

2014-01-01

16

Automatic Test case Generation from UML Activity Diagrams  

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Full Text Available Test Case Generation is an important phase in software development. Nowadays much of the research is done on UML diagrams for generating test cases. Activity diagrams are different from flow diagrams in the fact that activity diagrams express parallel behavior which flow diagrams cannot express. This paper concentrates on UML 2.0 Activity Diagram for generating test cases. Fork and join pair in activity diagram are used to represent concurrent activities. A novel method is proposed to generate test case for concurrent and non concurrent activities. Proposed approach details about the importance of concurrent nodes and their execution order in path generation.

V.Mary Sumalatha*1

2014-05-01

17

OOAspectZ and aspect-oriented UML class diagrams for Aspect-oriented software modelling (AOSM) / OOAspectZ y diagramas de clase orientados a los aspectos para la Modelación Orientada a Aspectos (MSOA)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: English Abstract in spanish En la búsqueda de desarrollo del software modularizado, la Programación Orientada a Aspectos (POA) identifica y representa de manera separada funcionalidades cruzadas en la etapa de programación del ciclo de desarrollo del software. Para las etapas previas del ciclo de desarrollo del software, parti [...] cularmente, en la especificación de requerimientos y el diseño estructural de los datos y comportamientos, este trabajo propone y aplica OOAspectZ para la especificación formal de requerimientos orientados a aspectos, además, describe y aplica diagramas de clases UML orientados en el diseño y la asociación entre clases y aspectos, para el proceso de Desarrollo del Software Orientado a Aspectos (DSOA), respectivamente. Particularmente, OOAspectZ es un lenguaje que integra los lenguajes formales Object-Z y AspectZ, mientras que, los diagramas de clases UML orientados a aspectos representan la estructura del código de POA, clases de objetos y clases de funcionalidades cruzadas con el uso de estereotipos. Este artículo muestra y aplica las principales características de los lenguajes OOAspectZ y diagramas de clase UML orientados a aspectos, para la modelación del software orientado a aspectos (MSOA) que se aplican a un ejemplo clásico de POA, además, se entregan ideas de trabajo futuro respecto a una actual versión de POA. Abstract in english Regarding modularised software development, Aspect-oriented programming (AOP) identifies and represents individually crosscutting concerns during the software development cycle's programming stage. This article proposes and applies OOAspectZ to formal Aspect-oriented requirement specifications for p [...] rior stages of the software development cycle. It particularly concerns requirement specification and the structural design of data and behaviour, along with describing and applying Aspect-oriented UML class diagrams to designing classes, aspects and associations among classes and aspects during Aspect-oriented software development (AOSD). OOAspectZ is a language integrating both Object-Z and AspectZ formal languages whereas Aspect-oriented UML class diagrams represent AOP code, object class and crosscutting concern class structure by means of stereotypes. This article shows and applies the main OOAspectZ and AO UML class diagram characteristics to Aspect-oriented software modelling (AOSM) using a classic example of AOP. Ideas for future work concerning an actual AOP version are also indicated.

C, Vidal Silva; R., Saens; C, Del Río; R, Villarroel.

2013-12-01

18

STAIRS - Understanding and Developing Specifications Expressed as UML Interaction Diagrams  

OpenAIRE

ABSTRACT STAIRS is a method for the step-wise, compositional development of interactions in the setting of UML 2.x. UML 2.x interactions, such as sequence diagrams and interaction overview diagrams, are seen as intuitive ways of describing communication between different parts of a system, and between a system and its users. STAIRS addresses the challenges of harmonizing intuition and formal reasoning by providing a precise understanding of the partial nature of interactions, and of how thi...

Runde, Ragnhild Kobro

2007-01-01

19

BDL: A Semantics Backbone for UML Dynamic Diagrams  

OpenAIRE

The UML (Unified Modelling Language) comprises various types of notations, to model the functional architecture, the behaviour of its components, and its deployment. Dynamic diagrams provide descriptions of the components and system behaviour. Examples of dynamic diagrams are collaboration and sequence diagrams to specify high level abstractions for sequences of actions involving several components of the system. Activity diagrams, state diagrams, and statecharts are used to specify the detai...

Caillaud, Benoit; Talpin, Jean-pierre; Je?ze?quel, Jean-marc; Benveniste, Albert; Jard, Claude

2000-01-01

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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

2012-06-01

21

A Formal Semantics for UML Activity Diagrams - Formalising Workflow Models  

OpenAIRE

In this report we define a formal execution semantics for UML activity diagrams that is appropriate for workflow modelling. Our workflow models express software requirements and therefore assume a perfect implementation. In our semantics, software state changes do not take time. It is based upon the Statemate semantics of statecharts, extended with some transactional properties to deal with data manipulation. Our semantics also deals with real time and with multiple state instances. We first ...

Eshuis, Rik; Wieringa, Roel

2001-01-01

22

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

23

UML 2.0 Pocket Reference UML Syntax and Usage  

CERN Document Server

Globe-trotting travelers have long resorted to handy, pocket-size dictionaries as an aid to communicating across the language barrier. Dan Pilone's UML 2.0 Pocket Reference is just such an aid for on-the-go developers who need to converse in the Unified Modeling Language (UML). Use this book to decipher the many UML diagrams you'll encounter on the path to delivering a modern software system. Updated to cover the very latest in UML, you'll find coverage of the following UML 2.0 diagram types: Class diagramsComponent diagrams*Sequence diagrams*Communication diagrams*Timing diagrams*Interactio

Pilone, Dan

2006-01-01

24

REGLAS PARA LA GENERACIÓN AUTOMÁTICA DE CÓDIGO DEFINIDAS SOBRE METAMODELOS SIMPLIFICADOS DE LOS DIAGRAMAS DE CLASES, SECUENCIAS Y MÁQUINA DE ESTADOS DE UML 2.0 / RULES FOR AUTOMATED CODE GENERATION DEFINED OVER SIMPLIFIED METAMODELS OF CLASS, SEQUENCE AND STATE MACHINE DIAGRAMS OF UML 2.0  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish La generación automática de código a partir de modelos ha sido una de las promesas parcialmente cumplidas en el desarrollo de software. La experiencia de las herramientas CASE, aún distante del automatismo absoluto, se complementa con algunos trabajos teóricos que se alejan de los estándares de mode [...] lamiento. En este artículo se proponen reglas para la generación de código a partir de metamodelos de diagramas de clases, secuencias y máquina de estados de UML. Las reglas están definidas en lógica de primer orden, permitiendo una especificación donde se evitan las ambigüedades y la necesidad de aprender un lenguaje de programación específico. Mediante un caso de estudio se representa la aplicación de las reglas de transformación, generando el código fuente de una clase en el lenguaje orientado a objetos Java. Abstract in english Automatic code generation from models has been one of the partially accomplished promises in software development. CASE Tools experiences, even so far from complete automatism, are complemented by some theoretic works, which torn apart modeling standards. In this paper we propose code generation rul [...] es from metamodels of the UML class, sequence, and state machine diagrams. The rules are defined on first-order logic, in order to allow the construction of a specification where both ambiguity and the need of learning a programming language are avoided. We also represent the application of transformation rules by means of a case study, and we generate source code of a class in the Java object-oriented programming language.

ANDRÉS, MUÑETÓN; CARLOS M., ZAPATA; FERNANDO, ARANGO.

2007-11-01

25

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

26

UML 2 Semantics and Applications  

CERN Document Server

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

27

Modeling Sequence Diagram in Fuzzy Uml to Fuzzy Petri-Net for Calculating Reliability Parameter  

OpenAIRE

Design quality in soft-ware systems is based on to achieving the non-functional parameters. It's obvious that lack of this ability in Fuzzy UML modeling can't response the needs of customers and market. Some times in real word, problems happened in non-accurate and un-certain manners. Because of this Fuzzy UML modeling be a lionize manner for analysts. This model will help us to survey the un-certain problem. Here you see the sequence diagram in Fuzzy UML that map with Fuzzy Petri-net. Thus t...

Reza Noorian Talouki; Homayon Motameni

2013-01-01

28

Modeling Sequence Diagram in Fuzzy Uml to Fuzzy Petri-Net for Calculating Reliability Parameter  

Directory of Open Access Journals (Sweden)

Full Text Available Design quality in soft-ware systems is based on to achieving the non-functional parameters. It's obvious that lack of this ability in Fuzzy UML modeling can't response the needs of customers and market. Some times in real word, problems happened in non-accurate and un-certain manners. Because of this Fuzzy UML modeling be a lionize manner for analysts. This model will help us to survey the un-certain problem. Here you see the sequence diagram in Fuzzy UML that map with Fuzzy Petri-net. Thus the ability of formal models will add to semi-formal Fuzzy UML. Formalization will add the automatic process ability to semiofficial Fuzzy UML. Automatic achieving to non-functional parameters like reliability in experimental system and survey the accuracy of done design are it's another benefits. The most important benefit of this model is reducing the cost because no experimental model will make before implementation. Usages of Fuzzy UML map to Fuzzy Petri-net, is obvious in control systems, critical and real-time.

Reza Noorian Talouki

2013-11-01

29

UNIFIED MODELING LANGUAGE TOOLS COLLABORATION FOR USE CASE, CLASS AND ACTIVITY DIAGRAM IMPLEMENTED WITH HTML 5 AND JAVASCRIPT FRAMEWORK  

OpenAIRE

As a result of the development of web 3.0, web technologies now make it possible for each user to collaborate in performing a task. This technology allows us to draw UML diagrams online and collaborate on a software project. Unified Modeling Language is one of the architectural modeling software that is widely used by software developers. This research aims to develop a modeling tool UML diagrams are class diagrams, use case diagrams and activity diagrams based on pre-existing web using HTML ...

Aditya Kurniawan; Bina Bestina Harefa; Surya Sujarwo

2014-01-01

30

Un framework para consistencias en relaciones de asociación entre clases en UML / A framework for consistences in association relations between classes in UML  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish El siguiente articulo muestra el proceso de construcción y validación de un framework para el manejo de consistencias en diagramas de clases de UML, específicamente opera sobre los diagramas de clase, mediante la aplicación de reglas de transformación, usando tanto la gramática de grafos como el OCL [...] (Object Constraint Language). El framework propuesto, luego de un recorrido sobre las técnicas de manejo de consistencias, opera sobre el diagrama de clase toda vez que este constituye el diagrama estructural, si se quiere, más importante, a la hora de modelar, y facilita la aplicación de reglas desde las técnicas tratadas, contribuyendo con ello a dotar a la comunidad de analistas y modeladores de una herramienta soporte para el refinamiento y mejoramiento de la calidad de los diagramas, opera así mismo, sobre un caso típico de aplicación para mostrar las bondades de la herramienta, lo cual facilita su comprensión y entendimiento. Abstract in english The following article shows the process of building and validating a framework for the management of consistencies in class diagrams in UML, operating specifically on class diagrams, through the application of transformation rules, using both graph grammar and OCL (Object Constraint Language). The p [...] roposed framework, after examining the techniques of consistency management, operates on a class diagram, since this constitutes a structural diagram. This is even more important when modeling, and it facilitates the application of rules based on the treated techniques, thus contributing to provide the community of analysts and modelers with a support tool for the refinement and quality improvement of the diagrams. It also operates on a typical case of application to show the tool's advantages, thus making it easier to comprehend and understand.

Javier Dario, Fernández-Ledesma.

2014-08-01

31

Designing Tool Support for Translating Use Cases and UML 2.0 Sequence Diagrams into a Coloured Petri Net  

DEFF Research Database (Denmark)

On a case study on the specification of an elevator controller, this paper presents an approach that can translate given UML descriptions into a Coloured Petri Net (CPN) model. The UML descriptions must be specified in the form of Use Cases (UCs) and UML 2.0 Sequence Diagrams (SDs). The CPN model constitutes one single, coherent and executable representation of all possible behaviours that are specified by the given UML artefacts. CPN is a formal modelling language that enables construction and analysis of scalable, executable models of behaviour. A combined use of UML and CPN can be useful in several projects. CPN is well supported by the tool called CPN Tools and the work we present here is aimed at building a CPN Tools front-end engine that implements the proposed translation.

Fernandes, Joao Miguel; Tjell, Simon

2007-01-01

32

UNIFIED MODELING LANGUAGE TOOLS COLLABORATION FOR USE CASE, CLASS AND ACTIVITY DIAGRAM IMPLEMENTED WITH HTML 5 AND JAVASCRIPT FRAMEWORK  

Directory of Open Access Journals (Sweden)

Full Text Available As a result of the development of web 3.0, web technologies now make it possible for each user to collaborate in performing a task. This technology allows us to draw UML diagrams online and collaborate on a software project. Unified Modeling Language is one of the architectural modeling software that is widely used by software developers. This research aims to develop a modeling tool UML diagrams are class diagrams, use case diagrams and activity diagrams based on pre-existing web using HTML 5 technology combine with JSON Service that allows the software developer to work on the same project UML and collaborate each other with good performance more faster than ordinary web.

Aditya Kurniawan

2014-01-01

33

UN AMBIENTE PARA LA OBTENCION AUTOMATICA DE DIAGRAMAS UML A PARTIR DE UN LENGUAJE CONTROLADO / AN ENVIRONMENT FOR AUTOMATED UML DIAGRAMS OBTAINING FROM A CONTROLLED LANGUAGE  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish 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 esq [...] uemas 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 (UN-Lencep), 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. Abstract in english Conventional Software Engineering tools have supported analysts in helping them for both model drawing and editing, but with little help in model conceptualization. Currently, there is a trend for automated conceptual schema generation and, despite of great advances, there’s still work on few diagra [...] ms, and even there are some problems especially related to consistency of the obtained diagrams. In this paper, we define an environment for automatically obtaining of UML 2.0 diagrams, including a controlled language-UN-Lencep-, a Knowledge representation language-Preconceptual Schemas-, and a set of rules for UML diagrams translation; this environment has been implemented in a CASE tool-UNC-Diagramador-and a case study example has been provided. This implementation supports analysts in both model conceptualization, and consistency improvement, due to the fact that resulting models are elaborated from the same text in controlled language.

CARLOS M., ZAPATA; FERNANDO, ARANGO I.

2007-11-01

34

TURTLE: A real-time UML profile supported by a formal validation toolkit  

OpenAIRE

Abstract The paper presents a UML 1.5 profile named TURTLE (Timed UML and RT-LOTOS Environment) endowed with a formal semantics given in terms of RT-LOTOS. TURTLE relies on UML's extensibility mechanisms to enhance class and activity diagrams. Class diagrams are extended with specialized classes named Tclasses, which communicate and synchronize through gates. Also, associations between Tclasses are attributed by a composition operator (Parallel, Synchro, Invocation, Sequence, or Preemption) w...

Apvrille, Ludovic; Courtiat, Jean-pierre; Lohr, Christophe; Saqui-sannes, Pierre

2004-01-01

35

Model Checking and Code Generation for UML Diagrams Using Graph Transformation  

OpenAIRE

UML is considered as the standard for object-oriented modelling language adopted by the ObjectManagement Group. However, UML has been criticized due to the lack of formal semantics and theambiguity of its models. In other hands, UML models can be mathematically verified and checked by usingits equivalent formal representation. So, in this paper, we propose an approach and a tool based on graphtransformation to perform an automatic mapping for verification purposes. This transformation aims to...

Wafa Chama; Raida Elmansouri; Allaoua Chaoui

2012-01-01

36

CDDiff: Semantic Differencing for Class Diagrams  

OpenAIRE

Class diagrams (CDs), which specify classes and the relationships between them, are widely used for modeling the structure of object-oriented systems. As models, programs, and systems evolve over time, during the development lifecycle and beyond it, effective change management is a major challenge in software development, which has attracted much research efforts in recent years. In this paper we present cddiff, a semantic diff operator for CDs. Unlike most existing approach...

Maoz, Shahar; Ringert, Jan Oliver; Rumpe, Bernhard

2014-01-01

37

Prototype of Intrusion Detection Model using UML 5.0 and Forward Engineering  

OpenAIRE

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 th...

Muthaiyan MADIAJAGAN,; Garg, Pragya

2011-01-01

38

Semi-Automatically Inducing Semantic Classes of Clinical Research Eligibility Criteria Using UMLS and Hierarchical Clustering  

OpenAIRE

This paper presents a novel approach to learning semantic classes of clinical research eligibility criteria. It uses the UMLS Semantic Types to represent semantic features and the Hierarchical Clustering method to group similar eligibility criteria. By establishing a gold standard using two independent raters, we evaluated the coverage and accuracy of the induced semantic classes. On 2,718 random eligibility criteria sentences, the inter-rater classification agreement was 85.73%. In a 10-fold...

Luo, Zhihui; Johnson, Stephen B.; Weng, Chunhua

2010-01-01

39

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 SciELO Colombia | Language: Spanish 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 en [...] contrar 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 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 pract [...] ices 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.

2008-12-01

40

OBJECT-ORIENTED DATABASE REPRESENTATION THORUGH UML  

Directory of Open Access Journals (Sweden)

Full Text Available Due to the lack of database representation through a well-known object oriented modeling language i.e. Unified Modeling Language (UML, the present work is an attempt to represent the database through UML. In the paper, a case study of Life Insurance Corporation of India is considered to represent the databases of different ongoing policies in the form of object orientation. This will enhance the functioning of the developed software designed on the basis of presented approach. UML Class and Sequence diagrams are designed and then implemented through the SQL Server.

Dr. Vipin Saxena,

2011-01-01

41

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 SciELO Chile | Language: Spanish 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 "l [...] impieza" en el modelado e implementación de las tareas principales de una aplicación software. Para estos efectos, se describe la metodología de desarrollo de software orientado 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 modelin [...] g and implementation of the main tasks of a software application. For these purposes, the object-oriented software development methodology (OOSD) is described remarking the importance 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.

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

42

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

43

An Aspectual UML Modelling Tool  

Directory of Open Access Journals (Sweden)

Full Text Available The aspect-orientation is a complement for object-orientation. Thus, it would be logical to investigate the adaptability of UML to aspect-orientation. This research focuses on investigating the Aspect-Oriented UML (AOUML approaches for understanding the benefits of a comprehensive framework for AOUML. Based on this study’s review, it is evident that, of late, the complexity and size of systems have grown up, which accumulatively have led to the manifestation of new concerns. Moreover, these new concerns have cut-cross other concerns and core classes in the system by its nature. Due to this fact, the concept of Advance Separation of Concerns (ASoC has been put on the table of discussions and the need for an approach to model and represent these crosscutting concerns (Aspect, which is responsible for producing, spreading and tangling representation throughout the development life cycle, is vital. A proper databases have been searched using the suitable keywords, which match this research questions as recommended by systematic review process; this research has collected 468 studies and screened them to minimize the number of studies to 73, which are more appropriate and directly related for this present study. The general scope of this research is to model aspect (crosscutting concerns using standard UML diagrams 2.4.1 (latest edition. UML behavioural and structural diagrams have been implemented on the top of object-orientation concepts, it has not been meant to be used to model aspect-orientation. Thus, this research has proposed a complete tailored framework that represents aspect’s constructs using all UML diagrams. The objective of this position study is to investigate the aspectual UML modelling tool which is currently being designed and implemented.

Noorazean Mohd. Ali

2012-01-01

44

Modeling and Application Domain Extension of CityGML in UML:  

OpenAIRE

This paper presents key aspects of the development of a Dutch 3D standard IMGeo as a CityGML ADE. The new ADE is modeled using UML class diagrams. However the OGC CityGML specification does not provide clear rules on modeling an ADE in UML. This paper describes how the extension was built, which provides general insight how CityGML can be extended for a specific applications starting from the UML diagrams. Several alternatives for modeling ADEs in UML have been investigated and compared. The ...

Den Brink, L.; Stoter, J. E.; Zlatanova, S.

2012-01-01

45

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 SciELO Colombia | Language: Spanish 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 Clas [...] es 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. 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 pro [...] posed 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 model 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.

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

2006-07-01

46

Automatic Test Case Generation for UML Object diagrams using Genetic Algorithm  

Directory of Open Access Journals (Sweden)

Full Text Available A new model based approach for automated generation of testcases in object oriented systems has been presented. The test casesare derived by analyzing the dynamic behavior of the objects due tointernal and external stimuli. The scope of the paper has beenlimited to the object diagrams taken from the Unified ModelingLanguage model of the system. Genetic Algorithm’s tree crossoverhas been proposed to bring out all possible test cases of a givenobject diagram. Illustrative case study has been presented toestablish the effectiveness of our methodology coupled with mutationanalysis

M. Prasanna

2009-07-01

47

Knowledge Based Consolidation of UML Diagrams for Creation of Virtual Enterprise  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper we address the problem related to determination of the most suitable candidates for an M&A (Merger & Acquisition scenario of Banks/Financial Institutions. During the pre-merger period of an M&A, a number of candidates may be available to undergo the Merger/Acquisition, but all of them may not be suitable. The normal practice is to carry out a due diligence exercise to identify the candidates that should lead to optimum increase in shareholder value and customer satisfaction, post-merger. The due diligence ought to be able to determine those candidates that are unsuitable for merger, those candidates that are relatively suitable, and those that are most suitable. Towards achieving the above objective, we propose a Fuzzy Data Mining Framework wherein Fuzzy Cluster Analysis concept is used for advisability of merger of two banks and other Financial Institutions. Subsequently, we propose orchestration/composition of business processes of two banks into consolidated business process during Merger & Acquisition (M&A scenario. Our paper discusses modeling of individual business process with UML, and the consolidation of the individual business process models by means of our proposed Knowledge Based approach.

Debasis Chanda

2010-03-01

48

TURTLE-P: a UML profile for the formal validation of critical and distributed systems  

OpenAIRE

The timed UML and RT-LOTOS environment, or TURTLE for short, extends UML class and activity diagrams with composition and temporal operators. TURTLE is a real-time UML profile with a formal semantics expressed in RT-LOTOS. Further, it is supported by a formal validation toolkit. This paper introduces TURTLE-P, an extended profile no longer restricted to the abstract modeling of distributed systems. Indeed, TURTLE-P addresses the concrete descriptions of communication architectures, including ...

Apvrille, Ludovic; Saqui-sannes, Pierre; Khendek, Ferhat

2006-01-01

49

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: English 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 reg [...] las, procesos semiasistidos con alta participación de expertos, dificultades en la representación conjunta de estructura y dinamismo del mundo, generación de un solo 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 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.

Carlos, Zapata; David, Cardona.

2008-06-01

50

Networked Knowledge Representation and Exchange using UML and RDF  

OpenAIRE

This paper proposes the use of the Unified Modeling Language (UML) as a language for modelling ontologies for Web resources and the knowledge contained within them. To provide a mechanism for serialising and processing object diagrams representing knowledge, a pair of XSLT stylesheets have been developed to map from XML Metadata Interchange (XMI) encodings of class diagrams to corresponding RDF schemas and to Java classes representing the concepts in the ontologies. The Java code includes met...

Cranefield, Stephen Department Of Information Science

2006-01-01

51

UML2SC: Herramienta para el diseño de sistemas electrónicos complejos utilizando los lenguajes UML y SystemC / UML2SC: A tool for developing complex electronic systems using UML and SystemC  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish En este artículo se presenta un proceso para la transformación de sistemas basados en hardware/software descritos mediante UML a código esqueleto SystemC. Se introduce la herramienta UML2SC, basada en librerías de Java, mediante la cual se puede realizar este proceso de transformación. La herramient [...] a UML2SC, permite obtener código esqueleto SystemC a partir de modelos descritos en UML mediante los diagramas de clases y estructura compuesta. Los resultados de la utilización de esta herramienta se presentan mediante un ejemplo, el cual describe el modelo funcional de una CPU RISC de 16 bits. Abstract in english In this paper, we propose a transformation process in which SystemC skeleton code is extracted from UML models that describe hardware/software based systems. The tool UML2SC, which is based on Java libraries, is also introduced. This tool allows the transformation of UML class and composite structur [...] e diagrams to SystemC skeleton code. An implementation example is given to illustrate the transformation process implemented in the UML2SC tool. The example describes the model of a CPU RISC of 16 bits.

Blanca Alicia, Correa; Juan Fernando, Eusse; Danny, Múnera; Silvio, Sepúlveda; Juan Fernando, Vélez; José Edinson, Aedo.

2009-06-01

52

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

2008-12-01

53

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 SciELO Colombia | Language: Spanish 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 si [...] stema. 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. 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 ge [...] neration 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.

2008-12-01

54

Improving Relationship between UML and Petri Nets for Analyzing System by Applying Object Oriented Petri Nets  

Directory of Open Access Journals (Sweden)

Full Text Available Today, by developing technology and presenting Object-Oriented and Concurrent systems, new modeling languages with powerful mathematical and formulaic base are needed. UML as an Object-Oriented modeling language is needed a powerful mathematical and formulaic base for its symbols, besides, Petri Nets as a language for Concurrent systems need to have symbols for representing Object-Oriented models.  In many complex systems, model presenting by Petri Nets caused model complexity and designer's perplexity and also due to wide changes in such systems, its part by part presenting by means of UML diagram is not possible. The aim of the paper is to present interface model called Object Oriented Petri Nets and its relevant software for converting Petri Nets complex model to various UML diagrams, in order to benefit from advantages of Petri Nets and UML model. In this model, Object Orienting main parts such as Object, Class, Encapsulation and Inheritance are presented with special symbols.

Meysam Aminzadeh

2013-02-01

55

Modeling and Analyzing Flight Control Software of Unmanned Aerial Vehicle Using UML and B Method  

Directory of Open Access Journals (Sweden)

Full Text Available B is a formal method which enables the automatic generation of an executable code through successive refinements from an abstract specification. Unified Modeling Language (UML specifications can be formally verified by analyzing the corresponding B specification, and integration of UML specifications and B method can overcomes the drawbacks of UML. In this paper the Class diagram of the flight control system is presented and each class operation is mapped to a B abstract machine. The flight control software behaviors are presented in the form of statecharts The B method is adopted to translate the statecharts into B specification of flight control software.Using UML and B method, flight control is refined and failure management is added. Finally proof obligations are presented to ensure the safety for the ertical control of artificial navigation of UAV.

Jiufu Liu

2014-04-01

56

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  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish 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 métodos 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 desarrollo, 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. Abstract in english 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 gene [...] rating 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 operations 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.

Carlos Mario, Zapata J.; Andrés Felipe, Muñetón.

2008-12-01

57

Automatic Synthesis of UML Designs from Requirements in an Iterative Process  

Science.gov (United States)

The Unified Modeling Language (UML) is gaining wide popularity for the design of object-oriented systems. UML combines various object-oriented graphical design notations under one common framework. A major factor for the broad acceptance of UML is that it can be conveniently used in a highly iterative, Use Case (or scenario-based) process (although the process is not a part of UML). Here, the (pre-) requirements for the software are specified rather informally as Use Cases and a set of scenarios. A scenario can be seen as an individual trace of a software artifact. Besides first sketches of a class diagram to illustrate the static system breakdown, scenarios are a favorite way of communication with the customer, because scenarios describe concrete interactions between entities and are thus easy to understand. Scenarios with a high level of detail are often expressed as sequence diagrams. Later in the design and implementation stage (elaboration and implementation phases), a design of the system's behavior is often developed as a set of statecharts. From there (and the full-fledged class diagram), actual code development is started. Current commercial UML tools support this phase by providing code generators for class diagrams and statecharts. In practice, it can be observed that the transition from requirements to design to code is a highly iterative process. In this talk, a set of algorithms is presented which perform reasonable synthesis and transformations between different UML notations (sequence diagrams, Object Constraint Language (OCL) constraints, statecharts). More specifically, we will discuss the following transformations: Statechart synthesis, introduction of hierarchy, consistency of modifications, and "design-debugging".

Schumann, Johann; Whittle, Jon; Clancy, Daniel (Technical Monitor)

2001-01-01

58

Preface to FP-UML 2009  

Science.gov (United States)

The Unified Modeling Language (UML) has been widely accepted as the standard object-oriented (OO) modeling language for modeling various aspects of software and information systems. The UML is an extensible language, in the sense that it provides mechanisms to introduce new elements for specific domains if necessary, such as web applications, database applications, business modeling, software development processes, data warehouses. Furthermore, the latest version of UML 2.0 got even bigger and more complicated with more diagrams for some good reasons. Although UML provides different diagrams for modeling different aspects of a software system, not all of them need to be applied in most cases. Therefore, heuristics, design guidelines, lessons learned from experiences are extremely important for the effective use of UML 2.0 and to avoid unnecessary complication. Also, approaches are needed to better manage UML 2.0 and its extensions so they do not become too complex too manage in the end.

Trujillo, Juan; Kim, Dae-Kyoo

59

Generation of test cases using UML models  

Directory of Open Access Journals (Sweden)

Full Text Available Software Testing plays an important role in Software development because it can minimize the development cost. UML is widely used in the software development, there consists of the designing and coding of the software. Designing phase is done with the help of the UML models, which consists of the sequence diagrams, activity diagrams, use case diagrams, state chart diagrams etc. After designing of the system, the next task is coding. Since the software development is time and human resource consuming, the reduction of consumption is done with the help of the code generation automatically. This work mainly focus on the UML sequence diagram and state chart diagram as the model. We Propose a Technique for Test Case Generation using UML Models. UML models give a lot of  information that should not be ignored in testing. An innovative approach of generating test cases from the combination of UML design diagrams has been discussed in this paper. Present work used an approach where sequence diagram and state chart diagram has been used to generate test cases. The test cases thus generated are suitable for dynamic testing of system.

Gurpreet Singh

2014-06-01

60

Transformation of UML models for service-oriented software architectures  

OpenAIRE

The main aim of this paper is to present how to transform user requirements models into a software architecture for mobile applications. The technique (called "4SRS") is essentially based on the mapping of UML use case diagrams into UML object diagrams. UML sequence, activity, and state diagrams and other artifacts can also be considered within the transformation decisions. The applicability of this technique is illustrated by presenting some results from an e-government mobile application. ...

Machado, Ricardo J.; Fernandes, Joa?o M.; Monteiro, Paula; Rodrigues, Helena

2005-01-01

61

UML IN BUSINESS ADMINISTRATION  

Directory of Open Access Journals (Sweden)

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

2010-12-01

62

A characterization of two classes of locally truncated diagram geometries  

OpenAIRE

We study locally truncated geometries that are parapolar spaces locally of type A_{n-1,j}(K) with n>6 and j=3,4. Residually connected sheaves over these geometries are constructed. It is proved that these geometries are residually connected diagram geometries whose universal 2-covers are truncations of buildings.

Onofrei, Silvia

2007-01-01

63

Extracting Code Resource from OWL by Matching Method Signatures using UML Design Document  

OpenAIRE

-Software companies develop projects in various domains, but hardly archive the programs for future use. The method signatures are stored in the OWL and the source code components are stored in HDFS. The OWL minimizes the software development cost considerably. The design phase generates many artifacts. One such artifact is the UML class diagram for the project that consists of classes, methods, attributes, relations etc., as metadata. Methods needed for the project can be extracted from this...

Gopinath Ganapathy; Sagayaraj, S.

2011-01-01

64

From UML Specification into FPGA Implementation  

Directory of Open Access Journals (Sweden)

Full Text Available In the paper a method of using the Unified Modeling Language for specification of digital systems, especially logic controllers, is presented. The proposed method is based mainly on the UML state machine diagrams and uses Hierarchical Concurrent Finite State Machines (HCFSMs as a temporary model. The paper shows a way to transform the UML diagrams, expressed in XML language, to the form that is acceptable by reconfigurable FPGAs (Field Programmable Gate Arrays. The UML specification is used to generate an effective program in Hardware Description Languages (HDLs, especially Verilog.

Grzegorz Bazydlo

2014-01-01

65

OBJECT-ORIENTED DATABASE REPRESENTATION THORUGH UML  

OpenAIRE

Due to the lack of database representation through a well-known object oriented modeling language i.e. Unified Modeling Language (UML), the present work is an attempt to represent the database through UML. In the paper, a case study of Life Insurance Corporation of India is considered to represent the databases of different ongoing policies in the form of object orientation. This will enhance the functioning of the developed software designed on the basis of presented approach. UML Class and ...

Dr. Vipin Saxena,; Santosh Kumar (Corresponding Author)

2011-01-01

66

Neutrosophic Diagram and Classes of Neutrosophic Paradoxes, or To the Outer-Limits of Science  

Science.gov (United States)

These paradoxes are called ``neutrosophic'' since they are based on indeterminacy (or neutrality, i.e. neither true nor false), which is the third component in neutrosophic logic. We generalize the Venn Diagram to a Neutrosophic Diagram, which deals with vague, inexact, ambiguous, illdefined ideas, statements, notions, entities with unclear borders. We define the neutrosophic truth table and introduce two neutrosophic operators (neuterization and antonymization operators) and we give many classes of neutrosophic paradoxes that may occur in sciences.

Smarandache, Florentin

2011-06-01

67

Neutrosophic Diagram and Classes of Neutrosophic Paradoxes or to the Outer-Limits of Science  

Directory of Open Access Journals (Sweden)

Full Text Available These paradoxes are called "neutrosophic" since they are based on indeterminacy (or neutrality, i.e. neither true nor false, which is the third component in neutrosophic logic. We generalize the Venn diagram to a Neutrosophic Diagram, which deals with vague, inexact, ambiguous, illdefined ideas, statements, notions, entities with unclear borders. We define the neutrosophic truth table and introduce two neutrosophic operators (neuterization and antonymization operators give many classes of neutrosophic paradoxes.

Smaradache F.

2010-10-01

68

Neutrosophic Diagram and Classes of Neutrosophic Paradoxes or to the Outer-Limits of Science  

OpenAIRE

These paradoxes are called "neutrosophic" since they are based on indeterminacy (or neutrality, i.e. neither true nor false), which is the third component in neutrosophic logic. We generalize the Venn diagram to a Neutrosophic Diagram, which deals with vague, inexact, ambiguous, illdefined ideas, statements, notions, entities with unclear borders. We define the neutrosophic truth table and introduce two neutrosophic operators (neuterization and antonymization operators) give many classes of n...

Smaradache F.

2010-01-01

69

??Android????????????UML??  

Directory of Open Access Journals (Sweden)

Full Text Available UML???????????????????????????????????Android??????????????????UML????????????????UML????????UML?????????UML???????UML????????????????????Java?????????????????????????????????????????????????????????UML?????????????????????????UML is a graphical modeling language for visualized construct and documentation representation. After demand of the function is analyzed, UML models of oil information appending, gas stations appending, oil information management and car oil consumption statistics are founded respectively based on UML tool in the information management system of car oil consumption on Mobile with Android OS. Then analysis and design of the application software are implemented. The application software is developed by using Java. The calculation method of car oil consumption is proposed based on the amount of oil left. It is more accurate and effective than traditional method which is based on oil lamp. The actual system shows that UML could be used to build system models effectively and also could improve the efficiency of application software development.

???

2014-05-01

70

A layout technique for class diagrams to be used in product configuration projects  

DEFF Research Database (Denmark)

For several companies the use of product configurators has produced a range of benefits such as minimising the use of resources and shortening the lead times in product specification processes. When developing a product configurator, two kinds of models are often created, namely analysis and design models. The task of describing product knowledge in analysis models involves domain experts, for which reason the analysis language has to be easily understandable in order to avoid extensive training. For this task the so-called Product Variant Master (PVM) diagramming technique is often applied. On the other hand, the requirements for the design language are more focused on having a formalised and rich language. For this task class diagrams are often applied. To avoid the use of different modelling languages in the analysis and design phase, this paper proposes and tests a layout technique that incorporates the usability of PVMs into class diagrams.

Haug, Anders; Hvam, Lars

2010-01-01

71

Solving the Class Diagram Restructuring Transformation Case with FunnyQT  

Directory of Open Access Journals (Sweden)

Full Text Available FunnyQT is a model querying and model transformation library for the functional Lisp-dialect Clojure providing a rich and efficient querying and transformation API. This paper describes the FunnyQT solution to the TTC 2013 Class Diagram Restructuring Transformation Case. This solution and the GROOVE solution share the best overall solution award for this case.

Tassilo Horn

2013-11-01

72

Solving the Class Diagram Restructuring Transformation Case with FunnyQT  

OpenAIRE

FunnyQT is a model querying and model transformation library for the functional Lisp-dialect Clojure providing a rich and efficient querying and transformation API. This paper describes the FunnyQT solution to the TTC 2013 Class Diagram Restructuring Transformation Case. This solution and the GROOVE solution share the best overall solution award for this case.

Tassilo Horn

2013-01-01

73

Biomedical Terminology Mapper for UML projects  

Science.gov (United States)

As the biomedical community collects and generates more and more data, the need to describe these datasets for exchange and interoperability becomes crucial. This paper presents a mapping algorithm that can help developers expose local implementations described with UML through standard terminologies. The input UML class or attribute name is first normalized and tokenized, then lookups in a UMLS-based dictionary are performed. For the evaluation of the algorithm 142 UML projects were extracted from caGrid and automatically mapped to National Cancer Institute (NCI) terminology concepts. Resulting mappings at the UML class and attribute levels were compared to the manually curated annotations provided in caGrid. Results are promising and show that this type of algorithm could speed-up the tedious process of mapping local implementations to standard biomedical terminologies. PMID:24303278

Thibault, Julien C.; Frey, Lewis

74

UML Modeling for the Watermarking Image File Using Transform Method  

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 the present paper, UML model has been designed for the watermarking in the image file using transform method because Digital watermarking is the process of embedding some information into a digital signal which is used to verify the authentication of image file or identity of its owner. In this paper digital signal is taken as picture and some information is embedded in to this file. At the time of transmitting a picture in the internet environment, picture as well as embedded information moves from node to node and at receiving end and one can get the authentic picture by extracting a embedded information from the watermarked image, which provide a secrecy in the image file. Watermarking is generally use in copyright protection systems which prevent unauthorized copying of digital media. The class diagram activity diagram and sequence diagram for the watermarking in the image file are depicted in this paper using the transformation technique.

Dr. Deepa Raj

2013-06-01

75

Secure State UML: Modeling and Testing Security Concerns of Software Systems Using UML State Machines  

Directory of Open Access Journals (Sweden)

Full Text Available In this research we present a technique by using which, extended UML models can be converted to standard UML models so that existing MBT techniques can be applied directly on these models. Existing Model Based Testing (MBT Techniques cannot be directly applied to extended UML models due to the difference of modeling notation and new model elements. Verification of these models is also very important. Realizing and testing non functional requirements such as efficiency, portability and security, at model level strengthens the ability of model to turn down risk, cost and probability of system failure in cost effective way. Access control is most widely used technique for implementing security in software systems. Existing approaches for security modeling focus on representation of access control policies such as authentication, role based access control by introducing security oriented model elements through extension in Unified Modelling Language (UML. But doing so hinders the potential and application of MBT techniques to verify these models and test access control policies. In this research we introduce a technique secure State UML to formally design security models with secure UML and then transform it to UML state machine diagrams so that it can be tested, verified by existing MBT techniques. By applying proposed technique on case studies, we found the results that MBT techniques can be applied on resulting state machine diagrams and generated test paths have potential to identify the risks associated with security constraints violation.

S. Batool

2014-05-01

76

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish 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. Abstract in english 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 deve [...] lop 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.

2008-07-01

77

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

2008-07-01

78

Formal Verification of Tokeneer Behaviours Modelled in fUML Using CSP  

OpenAIRE

Much research work has been done on formalizing UML diagrams, but less has focused on using this formalization to analyze the dynamic behaviours between formalized components. In this paper we propose using a subset of fUML (Foundational Subset for Executable UML) as a semi-formal language, and formalizing it to the process algebraic specification language CSP, to make use of FDR as a model checker. Our formalization includes modelling the asynchronous communication framework used within fUML...

Abdel Halim, I.; Sharp, J.; Schneider, S.; Treharne, H.

2010-01-01

79

Framework for Evaluating the Version Management Capabilities of a Class of UML Modeling Tools from the Viewpoint of Multi-site, Multi-partner Product Line Organizations  

OpenAIRE

UML models are widely used in software product line engineering for activities such as modeling the software product line reference architecture, detailed design, and automation of software code generation and testing. But in high-tech companies, modeling activities are typically distributed across multiple sites and involve multiple partners in different countries, thus complicating model management. Today’s UML modeling tools support sophisticated version managemen...

Koivulahti-ojala, Mervi; Ka?ko?la?, Timo

2009-01-01

80

Heavy-Weight and Light-weight UML Modelling Extensions of Aspect-Orientation in the Early Stage of Software Development  

Directory of Open Access Journals (Sweden)

Full Text Available Aspect-Orientation and Object-Orientation complement each other in a number of aspects. Hence, it is imperative to investigate level of adopting Unified Modelling Language (UML by the Aspect-Orientation. This study employed a systematic literature review to examine the approaches of Aspect-Oriented UML (AOUML. The rapid growth of complexities of systems, of late have eventually paved way for the emergence of new concerns. In fact these new concerns have cut-cross other concerns and core classes in the system by their nature. Therefore, it is crucial to focus on the concept of crosscutting concerns (Aspect, throughout the whole development life cycle, as they are accountable for generating, disseminating and interweaving depictions. The scope of this study is to depict and examine the current state of art of Aspect-Orientation modelling using UML. The UML diagrams have been implemented on the top of Object-Orientation concepts, it has not been meant to be used to model Aspect-Orientation. Thus, the motivation of this study is to propose a complete tailored formwork that represents Aspect’s constructs using all UML diagrams based on AspectJ constructs. The objective of this present study is find out the shortenings, lack of support, advantage and disadvantage of the existing well-known approaches of Aspect Modelling based on a carefully selected, evaluation and compression criteria. The examination and analysis have revealed that there are some deficiencies of Aspect representation in the early stage of software development, while using the existing UML. We have concluded that extensive research has to be carried out, for us to get a complete comprehensive framework modelling approach that covers all UML diagrams, rather than just a few, moreover we suggest that the assumption of modelling extensions have to depend on a reliable base.

Norazean Mohd Ali

2012-01-01

81

Introduction to the UMLS  

Directory of Open Access Journals (Sweden)

Full Text Available Since 1986 the National Library of Medicine has begun a long term research project to build the Unified Medical Language System. The purpose of the UMLS is to improve the capability of the system to realize user's biomedical queries and further help retrieve and integrate relevant information. To achieve the goals of the UMLS project, NLM designed four knowledge sources: Metathesaurus, Semantic Network, Information Source Map, and Specialist Lexicon. In this paper, we introduce the development assumption and strategy of the UMLS and the implementation of the four knowledge sources. We also try to analyze the possibilities of applying the four knowledge sources of the UMLS to the present information environment in Taiwan. We hope that this paper is just a beginning for us, so-called information managers, to think about how to build a powerful Chinese database.[Article content in Chinese

Huei-chu Chang

1996-12-01

82

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

2010-12-01

83

Translation from UML to Markov Model: A Performance Modeling Framework  

Science.gov (United States)

Performance engineering focuses on the quantitative investigation of the behavior of a system during the early phase of the system development life cycle. Bearing this on mind, we delineate a performance modeling framework of the application for communication system that proposes a translation process from high level UML notation to Continuous Time Markov Chain model (CTMC) and solves the model for relevant performance metrics. The framework utilizes UML collaborations, activity diagrams and deployment diagrams to be used for generating performance model for a communication system. The system dynamics will be captured by UML collaboration and activity diagram as reusable specification building blocks, while deployment diagram highlights the components of the system. The collaboration and activity show how reusable building blocks in the form of collaboration can compose together the service components through input and output pin by highlighting the behavior of the components and later a mapping between collaboration and system component identified by deployment diagram will be delineated. Moreover the UML models are annotated to associate performance related quality of service (QoS) information which is necessary for solving the performance model for relevant performance metrics through our proposed framework. The applicability of our proposed performance modeling framework in performance evaluation is delineated in the context of modeling a communication system.

Khan, Razib Hayat; Heegaard, Poul E.

84

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 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 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

Eduardo Batista de Moraes Barbosa

2011-05-01

85

UML Modeling and Parametric Design for Cross Shaft Universal Coupling CAD System  

Directory of Open Access Journals (Sweden)

Full Text Available In order to realize rapid custom design for cross shaft universal coupling products, enterprises need a parametric CAD system. On the basis of analyzing its functional requirements, this paper proposed the overall functional framework of cross shaft universal coupling CAD system, which mainly includes user management, product drawing, product design, document management and technical interface functional modules, etc. Based on UML modeling method, analyzed its use cases models, key class diagrams and activity diagrams of the CAD system. Then, by using Visual Basic 6.0 ActiveX Automation technology and SQL Server database technology, a parametric CAD software for cross shaft universal coupling was successfully developed, which has been used in enterprise’s design. Its application shows that the parametric CAD software is convenient to operate, and can rapidly realize parametric design of cross shaft universal coupling parts, so it helps to reduce the labor intensity of designers, and improve the quality and efficiency of design.

Yongming Wang

2012-09-01

86

BGen: A UML Behavior Network Generator Tool  

Science.gov (United States)

BGen software was designed for autogeneration of code based on a graphical representation of a behavior network used for controlling automatic vehicles. A common format used for describing a behavior network, such as that used in the JPL-developed behavior-based control system, CARACaS ["Control Architecture for Robotic Agent Command and Sensing" (NPO-43635), NASA Tech Briefs, Vol. 32, No. 10 (October 2008), page 40] includes a graph with sensory inputs flowing through the behaviors in order to generate the signals for the actuators that drive and steer the vehicle. A computer program to translate Unified Modeling Language (UML) Freeform Implementation Diagrams into a legacy C implementation of Behavior Network has been developed in order to simplify the development of C-code for behavior-based control systems. UML is a popular standard developed by the Object Management Group (OMG) to model software architectures graphically. The C implementation of a Behavior Network is functioning as a decision tree.

Huntsberger, Terry; Reder, Leonard J.; Balian, Harry

2010-01-01

87

Carroll Diagrams  

Science.gov (United States)

In this number sorting activity students must use a Carroll Diagram to determine which two categories each number fits into. This activity can be completed in pairs or groups on printable versions or it can be completed as a whole class using the interactive white board (IWB). Included with this resource are printable versions of the Carroll Diagrams, guiding questions, extension and support suggestions, and a link to more challenging "More Carroll Diagrams".

Team, Nrich

2012-01-01

88

Testen mit dem UML Testing Profile  

OpenAIRE

Das UML Testing Profile [UTP] ist eine grafische Modellierungssprache zur Definition, Dokumentation, Visualisierung, Implementierung und zum Austausch von modellbasierten Testspezifikationen auf Basis der UML [UML]. Der normative Teil der Spezifikation definiert das native UML-Profil des UTP1. Die Spezifikation des UTP als UML-Profil ist im Vergleich zu anderen Sprachen der UML-Familie [SysML, MARTE, SoaML] deutlich schlanker und kompakter, erfordert aber gleichzeitig profundes UML-Wissen, um...

Wendland, Marc-florian; Schieferdecker, Ina; Schacher, Markus

2011-01-01

89

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

2012-05-01

90

Generating a Performance Stochastic Model from UML Specifications  

CERN Document Server

Since its initiation by Connie Smith, the process of Software Performance Engineering (SPE) is becoming a growing concern. The idea is to bring performance evaluation into the software design process. This suitable methodology allows software designers to determine the performance of software during design. Several approaches have been proposed to provide such techniques. Some of them propose to derive from a UML (Unified Modeling Language) model a performance model such as Stochastic Petri Net (SPN) or Stochastic process Algebra (SPA) models. Our work belongs to the same category. We propose to derive from a UML model a Stochastic Automata Network (SAN) in order to obtain performance predictions. Our approach is more flexible due to the SAN modularity and its high resemblance to UML' state-chart diagram.

Sbeity, Ihab; Dbouk, Mohamed

2012-01-01

91

Generating a Performance Stochastic Model from UML Specifications  

Directory of Open Access Journals (Sweden)

Full Text Available Since its initiation by Connie Smith, the process of Software Performance Engineering (SPE is becoming a growing concern. The idea is to bring performance evaluation into the software design process. This suitable methodology allows software designers to determine the performance of software during design. Several approaches have been proposed to provide such techniques. Some of them propose to derive from a UML (Unified Modeling Language model a performance model such as Stochastic Petri Net (SPN or Stochastic process Algebra (SPA models. Our work belongs to the same category. We propose to derive from a UML model a Stochastic Automata Network (SAN in order to obtain performance predictions. Our approach is more flexible due to the SAN modularity and its high resemblance to UML' state-chart diagram.

Ihab Sbeity

2011-01-01

92

Towards the analysis of real-time systems: the UML/PNO approach  

OpenAIRE

This work focuses on the UML/PNO (Unified Modelling Language with Petri Net Objects) approach for the specification of real-time systems. It enhances the UML dynamic diagrams with the Petri Nets (PN) formal language. The concept of real-time components, called "Compound Object", has been developed as an extension of the UML sub-systems. The aim is to improve the system modelling and structuring. The behaviour of a Compound Object is described by means of time PN. The timing intervals are assi...

Delatour, Je?ro?me

2003-01-01

93

UML 2 Certification Guide Fundamental & Intermediate Exams  

CERN Document Server

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

94

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

95

From UML Specification into Implementation using Object Mapping  

CERN Document Server

In information systems, a system is analyzed using a modeling tool. Analysis is an important phase prior to implementation in order to obtain the correct requirements of the system. During the requirements phase, the software requirements specification (SRS) is used to specify the system requirements. Then, this requirements specification is used to implement the system. The requirements specification can be represented using either a structure approach or an object-oriented approach. A UML (Unified Modeling Language) specification is a well-known for representation of requirements specification in an object-oriented approach. In this paper, we present one case study and discuss how mapping from UML specification into implementation is done. The case study does not require advanced programming skills. However, it does require familiarity in creating and instantiating classes, object-oriented programming with inheritance, data structure, file processing and control loop. For the case study, UML specification i...

Ibrahim, Rosziati

2010-01-01

96

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

2010-10-01

97

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

2009-01-01

98

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

2010-11-01

99

Secure Systems Development with UML  

CERN Document Server

The extension UMLsec of the Unified Modeling Language for secure systems development is presented in this text. The first part is accessible to anyone with a basic background on object-oriented systems. The second part covers the mathematical tools needed to use the UMLsec approach to verify UML specifications against security requirements.

Jürjens, Jan

2005-01-01

100

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 SciELO Brazil | Language: English 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 Organizações 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 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.

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

101

Goal sketching with activity diagrams  

OpenAIRE

Goal orientation is acknowledged as an important paradigm in requirements engineering. The structure of a goal-responsibility model provides opportunities for appraising the intention of a development. Creating a suitable model under agile constraints (time, incompleteness and catching up after an initial burst of creativity) can be challenging. Here we propose a marriage of UML activity diagrams with goal sketching in order to facilitate the production of goal responsibility models under the...

Boness, Kenneth Duncan; Harrison, Rachel

2008-01-01

102

Exploiting UMLS Semantics for Checking Semantic Consistency among UMLS concepts  

Science.gov (United States)

Objectives To quantify semantic inconsistency in UMLS concepts from the perspective of their hierarchical relations and to show through examples how semantically-inconsistent concepts can help reveal erroneous synonymy relations. Methods Inconsistency is defined in reference to concepts from the UMLS Metathesaurus. Consistency is evaluated by comparing the semantic groups of the two concepts in each pair of hierarchically-related concepts. A limited number of inconsistent concepts was inspected manually. Results 81,512 concepts are inconsistent due to the differences in semantic groups between a concept and its parent. Four examples of wrong synonymy are presented. Conclusions A vast majority of inconsistent hierarchical relations are not indicative of any errors. We discovered an interesting semantic pattern along hierarchies, which seems associated with wrong synonymy. PMID:20841786

Erdogan, Halit; Erdem, Esra; Bodenreider, Olivier

2015-01-01

103

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

104

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

2011-07-01

105

Software Architecture modeling framework using UML  

OpenAIRE

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...

Aroul Canessane, R.; Srinivasan, Dr S.

2013-01-01

106

Performance Evaluation of Superscalar Processor Architecture Through UML  

Directory of Open Access Journals (Sweden)

Full Text Available In the current scenario, most of the applications are based upon graphical user interface and dependent upon the object-oriented technology. Software Industries are interested to convert old structured based softwares into object-oriented based softwares and also to reduce the lines of the code of application for reduction in the execution time of application. Therefore, it is a big challenge to reduce the execution time of the application based upon the object-oriented technology. The present work deals with the reduction of execution time for the superscalar machine by the use of object-oriented approach. A well known modeling language i.e. Unified Modeling Language (UML is used to model the superscalar pipeline architecture. UML class and sequence models are designed before computations of the execution time and computed results are depicted in the form of tables and graphs. The comparisons are also made by taking the two object-oriented programming languages.

Taskeen Zaidi

2013-07-01

107

Teaching Object-Oriented Modelling Using UML  

Science.gov (United States)

The paper elaborates on experiences and lessons learned from the course on object-oriented analyses and design at the Faculty of Sciences, Novi Sad. In the paper we identify a set of issues concerning teaching modeling and UML. It is described experience of teaching UML to students with and without previous knowledge of object-oriented programming.

Boberi?-Krsti?ev, Danijela; Tešendi?, Danijela

2011-09-01

108

Clock Constraints in UML/MARTE CCSL  

OpenAIRE

The UML Profile for Modeling and Analysis of Real-Time and Embedded (RTE) systems has recently been adopted by the OMG. Its Time Model extends the informal and simplistic Simple Time package proposed by UML2 and offers a broad range of capabilities required to model RTE systems including both discrete/dense and chronometric/logical time. MARTE OMG specification introduces a Time Structure inspired from Time models of the concurrency theory and proposes a new Clock Constraint Specification Lan...

Andre?, Charles; Mallet, Fre?de?ric

2008-01-01

109

UML CASE tool extension with model transformations  

OpenAIRE

In this master thesis the advanced design methodology is presented by which information systems requirements represented with precise UML models are transformed to project. The first section describes a research of five existing MDA tools comparison according to evaluation criteria. This criteria covers model to model and model to code transformations approach, platform of generated code and integration with UML CASE tools abilities. For requirements model transformation to design, plug-in fo...

Vitiutinas, Ruslanas

2006-01-01

110

Automatic Debugging Support for UML Designs  

OpenAIRE

Design of large software systems requires rigorous application of software engineering methods covering all phases of the software process. Debugging during the early design phases is extremely important, because late bug-fixes are expensive. In this paper, we describe an approach which facilitates debugging of UML requirements and designs. The Unified Modeling Language (UML) is a set of notations for object-orient design of a software system. We have developed an algor...

Schumann, Johann

2000-01-01

111

Specification and Refinement of Soft Real-time Requirements Using Sequence Diagrams  

OpenAIRE

Soft real-time requirements are often related to communication in distributed systems. Therefore it is interesting to understand how UML sequence diagrams can be used to specify such requirements. We propose a way of integrating soft real-time requirements in sequence diagram specifications by adding probabilities to timed sequence diagrams. Our approach builds on timed STAIRS, which is an approach to the compositional and incremental development of sequence diagrams supporting specification ...

Refsdal, Atle; Husa, Knut Eilif; Stølen, Ketil

2007-01-01

112

The UMLS knowledge source server: an object model for delivering UMLS data.  

Science.gov (United States)

The Unified Medical Language System (UMLS), a project of the National Library of Medicine (NLM), regularly distributes a set of knowledge sources to the research community. These data are made available over the Internet through the UMLS Knowledge Source Server (UMLSKS). The new version of the UMLSKS is a complete redesign of the original system using Java and the Extensible Markup Language (XML) technologies to implement a fast, reliable, flexible, and extensible UMLS data retrieval system that includes an Application Programmer's Interface (API) and an Object Model of each of the Knowledge Sources: the UMLS Metathesaurus, the Semantic Network, and the SPECIALIST Lexicon. In this paper we present the design of the new system, outline each of the system design goals, the UMLS Object Model, and statistics showing the usage of the new UMLSKS and associated data. We conclude with implications for future work. PMID:14728132

Bangalore, Anantha; Thorn, Karen E; Tilley, Carolyn; Peters, Lee

2003-01-01

113

An evaluation of the software architecture efficiency using the Clichés and behavioral diagrams pertaining to the unified modeling language  

Directory of Open Access Journals (Sweden)

Full Text Available The software architecture plays essential role for the development of the complicated software systems and it is important to evaluate the software architecture efficiency. One way to evaluate the software architecture is to create an executable model from the architecture. Unified Modeling Language (UML diagrams are used to describe the software architecture. UML has made it easy to use and to evaluate the necessary requirements at the software architecture level. It creates an executable model from these diagrams; yet, since the UML is a standard semi-formal language for describing the software architecture, evaluating the software architecture is not directly possible through it. Furthermore, in order to evaluate the software architecture, one needs to turn the actual model into the formal model. In this study, first we describe the architecture using the UML. Then, some properties of the software architecture are mentioned using the UML sequence diagram, deployment diagram, use case diagram, and component diagram. The necessary information associated with the qualitative characteristic of efficiency will be margined as clichés and labels to these diagrams. The independent and dependent components will be extracted from the component diagram. Finally, the resulted semi-formal model will be mapped into a formal model based on the colored Petri net and finally the evaluation will take place.

Siamak Khaksar Haghani

2014-06-01

114

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.

Christian SALLABERRY

2005-01-01

115

Venn Diagrams and Logic  

Science.gov (United States)

This math lesson from Illuminations uses Venn diagrams to illustrate direct, indirect and transitive reasoning. Students will learn the definitions of direct, indirect and transitive reasoning and give examples of each. Several student activity sheets are included. The material is intended for grades 9-12 and should require 2 and a half class periods to complete.

2011-01-04

116

Software engineering techniques applied to agricultural systems an object-oriented and UML approach  

CERN Document Server

Software Engineering Techniques Applied to Agricultural Systems presents cutting-edge software engineering techniques for designing and implementing better agricultural software systems based on the object-oriented paradigm and the Unified Modeling Language (UML). The focus is on the presentation of  rigorous step-by-step approaches for modeling flexible agricultural and environmental systems, starting with a conceptual diagram representing elements of the system and their relationships. Furthermore, diagrams such as sequential and collaboration diagrams are used to explain the dynamic and static aspects of the software system.    This second edition includes: a new chapter on Object Constraint Language (OCL), a new section dedicated to the Model-VIEW-Controller (MVC) design pattern, new chapters presenting details of two MDA-based tools – the Virtual Enterprise and Olivia Nova, and a new chapter with exercises on conceptual modeling.  It may be highly useful to undergraduate and graduate students as t...

Papajorgji, Petraq J

2014-01-01

117

Some user requirements of a remote reactor control analysed with UML tools  

International Nuclear Information System (INIS)

In this paper, we are dealing with remote participation in fusion experiments. The common problem of these different collaboration projects is the interactivity lack of the distant user. At the moment, remote participation in fusion experiments is still needed in the specification and analysis phases. In this context, tools which can identify the sub-systems involved and outside actors properly, and the dynamic views of the communications through use cases is very useful. We have experimented on Unified Modeling Language (UML) and found that it provides powerful diagrams for the conception of the future virtual control room

118

FPGA Implementations of Ladder Diagrams  

Directory of Open Access Journals (Sweden)

Full Text Available The performance of programmable logic controllers is often constrained by the microprocessor and the real-time firmware of the controller. Field programmable gate arrays (FPGAs are an attractive potential implementation medium for high-speed control because of their fast and parallel execution and programmable nature. Ladder Diagrams are a standard graphical programming method for industrial controllers, but compilers from Ladder Diagrams to FPGA hardware do not yet exist. This paper explores the comparative speed of four different classes of FGPA implementation of Ladder Diagrams - Interpreted Software, Compiled Software, Interpreted Hardware and Compiled Hardware. It also explores parallel versus serial execution of Ladder Diagrams in hardware, and identifies timers as a major resource user in parallel implementations. Overall, a Shared Timer Serial Compiled Hardware system for FPGA implementation of Ladder Diagrams is recommended. Using comparable FPGA resources to other alternatives it provides a 20-600 times speed improvement over other solutions whilst maintaining correct Ladder Diagram semantics.

Neil William Bergmann

2013-02-01

119

Executing AADL models with UML/Marte  

OpenAIRE

AADL and MARTE are two modeling formalisms supporting the analysis of real-time embedded systems. Since both cover similar aspects, a clear assessment of their respective strength and weakness is required. Building on previous works, we focus here on the time aspects of the two specifications. Relying on the MARTE Time Model and the operational semantics of its companion language CCSL we attempt to equipped UML activities with the execution semantics of an AADL specification. This is part of ...

Mallet, Fre?de?ric; Andre?, Charles; Deantoni, Julien

2009-01-01

120

On the semantics of UML/Marte Clock Constraints  

OpenAIRE

UML goal of being a general-purpose modeling language discards the possibility to adopt too precise and strict a semantics. Users are to refine or define the semantics in their domain specific profiles. In the UML Profile for Modeling and Analysis of Real-Time and Embedded systems, we have defined a broadly expressive Time Model to provide a generic timed interpretation for UML models. Our clock constraint specification language supports the specification of systems with multiple clock domain...

Mallet, Fre?de?ric; Andre?, Charles

2009-01-01

121

UML/MARTE CCSL, Signal and Petri nets  

OpenAIRE

UML goal of being a general-purpose modeling language discards the possibility to adopt too precise and strict a semantics. Users are to refine or define the semantics in their domain specific profiles. In the UML Profile for Modeling and Analysis of Real-Time and Embedded systems, we have defined a broadly expressive Time Model to provide a generic timed interpretation for UML models. Our clock constraint specification language supports the specification of systems with multiple clock domain...

Mallet, Fre?de?ric; Andre?, Charles

2008-01-01

122

CCSL: specifying clock constraints with UML/MARTE  

OpenAIRE

The Object Management Group (OMG) Unified Modeling Manguage (UML) profile for Modeling and Analysis of Real-Time and Embedded systems (MARTE) aims at using the general-purpose modeling language UML in the domain of Real-Time and Embedded (RTE) systems. To achieve this goal, it is absolutely required to introduce inside the mainly untimed UML an unambiguous time structure which MARTE model elements can rely on to build precise models amenable to formal analysis. The MARTE Time model has define...

Mallet, Fre?de?ric

2008-01-01

123

An evaluation of the software architecture efficiency using the Clichés and behavioral diagrams pertaining to the unified modeling language  

OpenAIRE

The software architecture plays essential role for the development of the complicated software systems and it is important to evaluate the software architecture efficiency. One way to evaluate the software architecture is to create an executable model from the architecture. Unified Modeling Language (UML) diagrams are used to describe the software architecture. UML has made it easy to use and to evaluate the necessary requirements at the software architecture level. It creates an executable m...

Siamak Khaksar Haghani; Yousef Abbasnejad; Ali Harounabadi

2014-01-01

124

Uso de diagrama V modificado como relatório em aulas teórico-práticas de química geral / Use of modified V diagram as a report in theoretical and practical classes of general chemistry  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] Abstract in english In this article, we present data from a study in practical classes for General Chemistry. To this end, it was proposed to use a modified V diagram to replace traditional reporting. These reports consist of material commonly prepared in the subject, including introduction, materials and methods, resu [...] lts and discussion and conclusions. From the preparation of the modified V, the students were able to establish relationships between the theoretical and methodological aspects necessary for understanding the objects and events studied. Thus, student learning can be evaluated in light of the Theory of Meaningful Learning.

Maria Fernanda Campos, Mendonça; Márcia Regina, Cordeiro; Keila Bossolani, Kiill.

1249-12-01

125

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

126

Phase diagrams  

International Nuclear Information System (INIS)

The description is presented of binary phase diagrams of titanium alloyed with the following elements: silver, aluminium, arsenic, gold, boron, barium, beryllium, bismuth, carbon, calcium, cadmium, cobalt, chromium, copper, iron, gallium, germanium, hydrogen, hafnium, indium, iridium, potassium, lithium, magnesium, manganese, molybdenum, nitrogen, sodium, niobium, nickel, oxygen, osmium, phosphorus, lead, palladium, platinum, plutonium, rhenium, lanthanium, cerium, preseodymium, neodymium, gadolinium, erbium, terbium, thulium, lutetium, rhodium, ruthenium, scandium, silicon, tin, strontium, tantalum, technetium, thorium, uranium, vanadium, tungsten, yttrium, ytterbium, zinc and zirconium

127

Efficient Representation of Timed UML 2 Interactions  

DEFF Research Database (Denmark)

UML 2 interactions describe system behavior over time in a declarative way. The standard approach to defining their formal semantics enumerates traces of events; other representation formats, like Büchi automata or prime event structures, have been suggested, too. We describe another, more succinct format, interaction structures, which is based on asymmetric event structures. It simplifies the integration of real time, and complex operators like alt and break, and leads to an efficient semantic representation of interactions. We provide the formalism, and a prototypical implementation highlighting the benefits of our approach.

Knapp, Alexander; Störrle, Harald

2014-01-01

128

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

129

On the Impact of Diagram Layout: How Are Models Actually Read?  

DEFF Research Database (Denmark)

This poster presents the latest results from a very large eye tracking study (n=29) that explores how modelers read UML diagrams. We find that various factors like layout quality, modeler experience, and diagram type lead to significant differences in diagram reading strategies. We derive elements of a theory of diagram reading behavior from our findings. This paper presents only late breaking results: all findings presented, theories constructed, and conclusions drawn are of a preliminary nature. This paper does not present the amount and degree of evidence that would allow us to consider the contents as being scientifically validated, yet.

Störrle, Harald; Baltsen, Nick

2014-01-01

130

Phase Diagram  

Science.gov (United States)

The thermodynamics of several aspects of the carbothermic reduction of alumina have been examined. In Part I, the results of measuring the evolved CO from the reaction between Al2O3 and C mixtures were used to determine the temperature and carbon contents for carbide formation at alumina saturation and at carbide saturation in the Al2O3-Al4C3 system. In this part of the paper, results are presented for a thermogravimetric study of the reactions of Al2O3 with carbon, as well as those for the determination of the Al2O3 liquidus line and the Al2O3-Al4O4C eutectic in the Al2O3-Al4C3 phase diagram. The critical temperature for Al2O3 and C to react, producing gas at 1 atm., was in agreement with that predicted from thermodynamics and measured in Part I of this paper. However, the Al2O3 liquidus appeared to be steeper and the eutectic temperature lower than the predicted phase diagram.

Walker, Matthew S.; Fruehan, Richard J.

2014-08-01

131

Formalisation of the UML Profile for SDL - A Case Study  

OpenAIRE

With the UML 2.0 standard, the Unified Modeling Language took a big step towards SDL, incorporating many features of the language. SDL is a mature and complete language with formal semantics. The Z.109 standard defines a UML Profile for SDL, mapping UML constructs to corresponding counterparts in SDL, giving them a precise semantics. In this report, we present a case study for the formalisation of the Z.109 standard. The formal definition makes the mapping precise and can be used to derive to...

Grammes, Ru?diger

2006-01-01

132

HRT-UML: a design method for hard real-time systems based on the UML notation  

Science.gov (United States)

The Hard Real-Time-Unified Modelling Language (HRT-UML) method aims at providing a comprehensive solution to the modeling of Hard Real Time systems. The experience shows that the design of Hard Real-Time systems needs methodologies suitable for the modeling and analysis of aspects related to time, schedulability and performance. In the context of the European Aerospace community a reference method for design is Hierarchical Object Oriented Design (HOOD) and in particular its extension for the modeling of hard real time systems, Hard Real-Time-Hierarchical Object Oriented Design (HRT-HOOD), recommended by the European Space Agency (ESA) for the development of on-board systems. On the other hand in recent years the Unified Modelling Language (UML) has been gaining a very large acceptance in a wide range of domains, all over the world, becoming a de-facto international standard. Tool vendors are very active in this potentially big market. In the Aerospace domain the common opinion is that UML, as a general notation, is not suitable for Hard Real Time systems, even if its importance is recognized as a standard and as a technological trend in the near future. These considerations suggest the possibility of replacing the HRT-HOOD method with a customized version of UML, that incorporates the advantages of both standards and complements the weak points. This approach has the clear advantage of making HRT-HOOD converge on a more powerful and expressive modeling notation. The paper identifies a mapping of the HRT-HOOD semantics into the UML one, and proposes a UML extension profile, that we call HRT-UML, based on the UML standard extension mechanisms, to fully represent HRT-HOOD design concepts. Finally it discusses the relationships between our profile and the UML profile for schedulability, performance and time, adopted by OMG in November 2001.

D'Alessandro, Massimo; Mazzini, Silvia; di Natale, Marco; Lipari, Giuseppe

2002-07-01

133

The UMLS® Semantic Network and the Semantic Web  

OpenAIRE

The Unified Medical Language System® (UMLS®) , an extensive source of biomedical knowledge developed and maintained by the US National Library of Medicine (NLM) is being currently used in a wide variety of biomedical applications. The Semantic Network, a component of the UMLS is a structured description of core biomedical knowledge consisting of well defined semantic types and relationships between them. We investigate the expressiveness of DAML+OIL, a markup language proposed for ontologie...

Kashyap, Vipul

2003-01-01

134

Ontology Based Semantics Checking for UML Activity Model  

OpenAIRE

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 i...

Li Chen; Hongyue He; Zhixue Wang; Ying Zhang

2012-01-01

135

Analysis of System-Failure Rate Caused by Soft-Errors using a UML-Based Systematic Methodology in an SoC  

OpenAIRE

This paper proposes an analytical method to assess the soft-error rate (SER) in the early stages of a System-on-Chip (SoC) platform-based design methodology. The proposed method gets an executable UML (Unified Modeling Language) model of the SoC and the raw soft- error rate of different parts of the platform as its inputs. Soft-errors on the design are modeled by disturbances on the value of attributes in the classes of the UML model and disturbances on opcodes of software cores. The Dynamic ...

Di Carlo, Stefano; Prinetto, Paolo Ernesto; Benso, Alfredo; Di Natale, Giorgio

2007-01-01

136

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

2014-01-01

137

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

2010-07-01

138

Well-formedness and typing rules for UML Composite Structures  

CERN Document Server

Starting from version 2.0, UML introduced hierarchical composite structures, which are an 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 disambiguate the meaning of UML composite structures. Our primary goal was to have an operational model of composite structures for the OMEGA UML profile, an executable profile dedicated to the formal specification and validation of real-time systems, developed in a past project to which we contributed. However, the rules and principles stated here are applicable to other hierarchical component models based on the same concepts, such as SysML. The presented ruleset is supported by an OCL formalization which is described in this report. This formalization was applied on different complex models for the evaluation and validation of the proposed principles.

Dragomir, Iulia

2010-01-01

139

Transforming UML 'Collaborating' Statecharts for Verification and Simulation  

Directory of Open Access Journals (Sweden)

Full Text Available Due to the increasing complexity of real world problems, it is costly and difficult to validate today's software-intensive systems. The research reported in the paper describes our experiences in developing and applying a set of methodologies for specifying, verifying, and validating system temporal behavior expressed as UML statecharts. The methods combine such techniques/paradigms and technologies as UML, XMI, database, model checking, and simulation. The toolset we are developing accepts XMI input files as an intermediate metadata format. The metadata is then parsed and transformed into databases and related syntax-driven data structures. From the parsed data, we subsequently generate Promela code, which embodies the behavioral semantics and properties of the statechart elements. Compiling and executing Promela automatically invokes SPIN, the underlying temporal logic-based tool for checking the logical consistency of the statecharts' interactions and properties. We validate and demonstrate our methodology by modeling and simulation using both ArgoUML and Rhapsody™, respectively.

Patrick O. Bobbie

2003-04-01

140

The UMLS Knowledge Source Server: a versatile Internet-based research tool.  

OpenAIRE

The National Library of Medicine's Unified Medical Language System (UMLS) project regularly distributes a set of Knowledge Sources to the research community. In 1995 the UMLS data were made available for the first time through the Internet-based UMLS Knowledge Source Server. The server can be accessed through three different client interfaces. The World Wide Web interface allows users to browse and explore the data and to see how those data are organized in the UMLS. The command-line interfac...

Mccray, A. T.; Razi, A. M.; Bangalore, A. K.; Browne, A. C.; Stavri, P. Z.

1996-01-01

141

Source Authenticity in the UMLS – A Case Study of the Minimal Standard Terminology  

OpenAIRE

As the UMLS integrates multiple source vocabularies, the integration process requires that certain adaptation be applied to the source. Our interest is in examining the relationship between the UMLS representation of a source vocabulary and the source vocabulary itself. We investigated the integration of the Minimal Standard Terminology (MST) into the UMLS in order to examine how close its UMLS representation is to the source MST. The MST was conceived as a “minimal” list of terms and str...

Elhanan, Gai; Huang, Kuo-chuan; Perl, Yehoshua

2010-01-01

142

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

OpenAIRE

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...

Arup Abhinna Acharya; Durga Prasad Mohapatra; Namita Panda

2011-01-01

143

Knowledge Based Consolidation of UML Diagrams for Creation of Virtual Enterprise  

OpenAIRE

In this paper we address the problem related to determination of the most suitable candidates for an M&A (Merger & Acquisition) scenario of Banks/Financial Institutions. During the pre-merger period of an M&A, a number of candidates may be available to undergo the Merger/Acquisition, but all of them may not be suitable. The normal practice is to carry out a due diligence exercise to identify the candidates that should lead to optimum increase in shareholder value and customer sati...

Debasis Chanda; Dwijesh Dutta Majumder; Swapan Bhattacharya

2010-01-01

144

Automating {UML} Models Merge for Web Services Testing  

OpenAIRE

This paper presents a method for merging UML models which takes place in a quality evaluation framework for Web Services (WS). This framework, called iTac-QoS, is an ex- tended UDDI server (a yellow pages system dedicated to WS), using model based testing to assess quality. WS ven- dors have to create UML model of their product and our framework extracts tests from it. Depending on the results of the test execution, a mark is given to WS. This mark per- mits to customers to have an idea about...

Pretre, Vincent; Bouquet, Fabrice; Lang, Christophe

2008-01-01

145

Automated UML models merging for web services testing  

OpenAIRE

This paper presents a method for merging UML models which takes place in a quality evaluation framework for Web Services (WS). This framework, called iTac-QoS, is an extended UDDI server (a yellow pages system dedicated to WS), using model based testing to assess quality. WS vendors have to create UML model of their product and our framework extracts tests from it. Depending on the results of the test execution, a mark is given to WS. This mark gives to the cus- tomers an idea about the quali...

Pretre, Vincent; Kermadec, Adrien; Bouquet, Fabrice; Lang, Christophe; Dadeau, Fre?de?ric

2009-01-01

146

UML-basierte Modellierung und Verifikation von Steuerungen  

OpenAIRE

Die Komplexität von Steuerungen und deren Anwendungen in sicherheitskritischen Bereichen der Automatisierungstechnik erfordern ein hohes Maß an Betriebssicherheit. Mit zunehmender Komplexität der Systeme steigt der Bedarf, Systemkonzepte vorab durch simulationsbasierte und formale Verifikationsverfahren hinsichtlich geforderter Eigenschaften zu bewerten. Grundlage dafür ist ein gemeinsames Modell von Steuerung und Anlage, wobei die Steuerung durch UML-konforme Zustandsdiagramme und die An...

Donath, U.; Haufe, J.

2009-01-01

147

Orientación a aspectos en UML2 sin extensiones  

Directory of Open Access Journals (Sweden)

Full Text Available El desarrollo de software orientado a aspectos ha evolucionado más allá de su origen, ligado al nivel de implementación, y se ha extendido por todo el ciclo de vida. Diversos enfoques han tratado de describir los conceptos y principios orientados a aspectos en elnivel de diseño, utilizando notaciones apropiadas. La mayoría han definido algún perfil de UML, o incluso un metamodelo extendido, con el fin de proporcionar el marco conceptual necesario. Este artículo expone, sin embargo, que esto no es necesario, y que UML2 (concretamente la versión 2.1 actual, si se estudia con cuidado, proporciona ya un soporte nativo para la descripción de aspectos. La idea básica es utilizar el nuevo soporte para modelos de roles de UML2, y utilizar las analogías entre roles y aspectos para elaborar unenfoque orientado a aspectos. Por tanto, el artículo explora la evolución de los modelos de roles en UML, así como los detalles específicos de la versión actual, en la que se encuentran fuertemente ligados al soporte arquitectónico definido mediante el modelo de "partes-y-puertos". Así pues, se define un modelo dual de composición invasiva basado en este esquema, de modo que se incluye todo concepto orientado a aspectos relevante, sin que haya sido necesaria ninguna extensión específica.

Mar\\u00EDa del Pilar Romay Rodr\\u00EDguez

2008-01-01

148

Application-specific UML profiles for multidisciplinary product data integration  

OpenAIRE

Die Dissertation untersucht die Eignung der Unified Modeling Language (UML) für den Aufbau eines zentralen Produktmodells zur multidisziplinären Produktdatenintegration. Im rechnerunterstützten Produktentwurf werden spezialisierte disziplinspezifische Software-Anwendungen zur Modellierung und Simulation von verschiedenen Produktaspekten verwendet. Abhängigkeiten zwischen Modellen treten häufig auf infolge der redundanten Verteilung von Produktdaten über mehrere Modelle und der Beziehung...

Reichwein, Axel

2011-01-01

149

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

150

Rewriting and suppressing UMLS terms for improved biomedical term identification  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Identification of terms is essential for biomedical text mining.. We concentrate here on the use of vocabularies for term identification, specifically the Unified Medical Language System (UMLS. To make the UMLS more suitable for biomedical text mining we implemented and evaluated nine term rewrite and eight term suppression rules. The rules rely on UMLS properties that have been identified in previous work by others, together with an additional set of new properties discovered by our group during our work with the UMLS. Our work complements the earlier work in that we measure the impact on the number of terms identified by the different rules on a MEDLINE corpus. The number of uniquely identified terms and their frequency in MEDLINE were computed before and after applying the rules. The 50 most frequently found terms together with a sample of 100 randomly selected terms were evaluated for every rule. Results Five of the nine rewrite rules were found to generate additional synonyms and spelling variants that correctly corresponded to the meaning of the original terms and seven out of the eight suppression rules were found to suppress only undesired terms. Using the five rewrite rules that passed our evaluation, we were able to identify 1,117,772 new occurrences of 14,784 rewritten terms in MEDLINE. Without the rewriting, we recognized 651,268 terms belonging to 397,414 concepts; with rewriting, we recognized 666,053 terms belonging to 410,823 concepts, which is an increase of 2.8% in the number of terms and an increase of 3.4% in the number of concepts recognized. Using the seven suppression rules, a total of 257,118 undesired terms were suppressed in the UMLS, notably decreasing its size. 7,397 terms were suppressed in the corpus. Conclusions We recommend applying the five rewrite rules and seven suppression rules that passed our evaluation when the UMLS is to be used for biomedical term identification in MEDLINE. A software tool to apply these rules to the UMLS is freely available at http://biosemantics.org/casper.

Hettne Kristina M

2010-03-01

151

Extrinsic Curvature Embedding Diagrams  

CERN Document Server

Embedding diagrams have been used extensively to visualize the properties of curved space in Relativity. We introduce a new kind of embedding diagram based on the {\\it extrinsic} curvature (instead of the intrinsic curvature). Such an extrinsic curvature embedding diagram, when used together with the usual kind of intrinsic curvature embedding diagram, carries the information of how a surface is {\\it embedded} in the higher dimensional curved space. Simple examples are given to illustrate the idea.

Lu, J L

2003-01-01

152

Labeled floor diagrams for plane curves  

OpenAIRE

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 ...

Fomin, Sergey; Mikhalkin, Grigory

2009-01-01

153

Tree Diagrams and Probability  

Science.gov (United States)

This lesson is designed to develop students' ability to create tree diagrams and figure probabilities of events based on those diagrams. This lesson provides links to discussions and activities related to tree diagrams as well as suggested ways to work them into the lesson. Finally, the lesson provides links to follow-up lessons designed for use in succession with the current one.

2010-01-01

154

Evaluation Methodology for UML and GML Application Schemas Quality  

Science.gov (United States)

INSPIRE Directive implementation in Poland has caused the significant increase of interest in making spatial data and services available, particularly among public administration and private institutions. This entailed a series of initiatives that aim to harmonise different spatial data sets, so to ensure their internal logical and semantic coherence. Harmonisation lets to reach the interoperability of spatial databases, then among other things enables joining them together. The process of harmonisation requires either working out new data structures or adjusting existing data structures of spatial databases to INSPIRE guidelines and recommendations. Data structures are described with the use of UML and GML application schemas. Although working out accurate and correct application schemas isn't an easy task. There should be considered many issues, for instance recommendations of ISO 19100 series of Geographic Information Standards, appropriate regulations for given problem or topic, production opportunities and limitations (software, tools). In addition, GML application schema is deeply connected with UML application schema, it should be its translation. Not everything that can be expressed in UML, though can be directly expressed in GML, and this can have significant influence on the spatial data sets interoperability, and thereby the ability to valid data exchange. For these reasons, the capability to examine and estimate UML and GML application schemas quality, therein also the capability to explore their entropy, would be very important. The principal subject of this research is to propose an evaluation methodology for UML and GML application schemas quality prepared in the Head Office of Geodesy and Cartography in Poland within the INSPIRE Directive implementation works.

Chojka, Agnieszka

2014-05-01

155

General Methodology for developing UML models from UI  

CERN Document Server

In recent past every discipline and every industry have their own methods of developing products. It may be software development, mechanics, construction, psychology and so on. These demarcations work fine as long as the requirements are within one discipline. However, if the project extends over several disciplines, interfaces have to be created and coordinated between the methods of these disciplines. Performance is an important quality aspect of Web Services because of their distributed nature. Predicting the performance of web services during early stages of software development is significant. In Industry, Prototype of these applications is developed during analysis phase of Software Development Life Cycle (SDLC). However, Performance models are generated from UML models. Methodologies for predicting the performance from UML models is available. Hence, In this paper, a methodology for developing Use Case model and Activity model from User Interface is presented. The methodology is illustrated with a case...

Reddy, Ch Ram Mohan; Srinivasa, K G; Kumar, T V Suresh; Kanth, K Rajani

2012-01-01

156

Methods of checking general safety criteria in UML statechart specifications  

International Nuclear Information System (INIS)

This paper describes methods and tools for safety analysis of UML statechart specifications. A comprehensive set of general safety criteria including completeness and consistency is applied in automated analysis. Analysis techniques are based on OCL expressions, graph transformations and reachability analysis. Two canonical intermediate representations of the statechart specification are introduced. They are suitable for straightforward implementation of checker methods and for the support of the proof of the correctness and soundness of the applied analysis. One of them also serves as a basis of the metamodel of a variant of UML statecharts proposed for the specification of safety-critical control systems. The analysis is extended to object-oriented specifications. Examples illustrate the application of the checker methods implemented by an automated tool-set

157

Real-time object uniform design methodology with UML  

CERN Document Server

The competitiveness of organizations facing globalization, information and communication technologies relies on strategic issues such as reuse of knowledge from past experiences to make higher quality decisions, deployment of innovative, fast methodological approaches for solving problems and building systems. Real-life systems are often multidisciplinary; their development commands a uniform way of object modeling in order to close the loop of various interactions crossing multiple domains. An innovative methodology, built on UML version 2 and MDA (Model Driven Architecture), is proposed to explain how to design large-scale systems and make software reuse a reality, how logical models can be built progressively and transformed into business assets, how real time and database systems can be integrated smoothly along a single development stream. First, the metalanguage of UML is introduced as a lesson of rigorous and meta system development. That helps developers to acquire a deep understanding of meta element...

Bui, Duc Minh

2007-01-01

158

Aggregating UMLS Semantic Types for Reducing Conceptual Complexity  

Science.gov (United States)

The conceptual complexity of a domain can make it difficult for users of information systems to comprehend and interact with the knowledge embedded in those systems. The Unified Medical Language System® (UMLS) currently integrates over 730,000 biomedical concepts from more than fifty biomedical vocabularies. The UMLS semantic network reduces the complexity of this construct by grouping concepts according to the semantic types that have been assigned to them. For certain purposes, however, an even smaller and coarser-grained set of semantic type groupings may be desirable. In this paper, we discuss our approach to creating such a set. We present six basic principles, and then apply those principles in aggregating the existing 134 semantic types into a set of 15 groupings. We present some of the difficulties we encountered and the consequences of the decisions we have made. We discuss some possible uses of the semantic groups, and we conclude with implications for future work. PMID:11604736

McCray, Alexa T.; Burgun, Anita; Bodenreider, Olivier

2015-01-01

159

Latent Semantic Indexing of medical diagnoses using UMLS semantic structures.  

Science.gov (United States)

The relational files within the UMLS Metathesaurus contain rich semantic associations to main concepts. We invoked the technique of Latent Semantic Indexing to generate information matrices based on these relationships and created "semantic vectors" using singular value decomposition. Evaluations were made on the complete set and subsets of Metathesaurus main concepts with the semantic type "Disease or Syndrome." Real number matrices were created with main concepts, lexical variants, synonyms, and associated expressions. Ancestors, children, siblings, and related terms were added to alternative matrices, preserving the hierarchical direction of the relation as the imaginary component of a complex number. Preliminary evaluation suggests that this technique is robust. A major advantage is the exploitation of semantic features which derive from a statistical decomposition of UMLS structures, possibly reducing dependence on the tedious construction of semantic frames by humans. PMID:1807584

Chute, C. G.; Yang, Y.; Evans, D. A.

1991-01-01

160

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

2003-06-01

161

Latent Semantic Indexing of medical diagnoses using UMLS semantic structures.  

OpenAIRE

The relational files within the UMLS Metathesaurus contain rich semantic associations to main concepts. We invoked the technique of Latent Semantic Indexing to generate information matrices based on these relationships and created "semantic vectors" using singular value decomposition. Evaluations were made on the complete set and subsets of Metathesaurus main concepts with the semantic type "Disease or Syndrome." Real number matrices were created with main concepts, lexical variants, synonyms...

Chute, C. G.; Yang, Y.; Evans, D. A.

1991-01-01

162

Auto-Coding UML Statecharts for Flight Software  

Science.gov (United States)

Statecharts have been used as a means to communicate behaviors in a precise manner between system engineers and software engineers. Hand-translating a statechart to code, as done on some previous space missions, introduces the possibility of errors in the transformation from chart to code. To improve auto-coding, we have developed a process that generates flight code from UML statecharts. Our process is being used for the flight software on the Space Interferometer Mission (SIM).

Benowitz, Edward G; Clark, Ken; Watney, Garth J.

2006-01-01

163

Braided chord diagrams  

OpenAIRE

The notion of a braided chord diagram is introduced and studied. An equivalence relation is given which identifies all braidings of a fixed chord diagram. It is shown that finite-type invariants are stratified by braid index for knots which can be represented as closed 3-braids. Partial results are obtained about spanning sets for the algebra of chord diagrams of braid index 3.

Birman, Joan S.; Trapp, Rolland

1998-01-01

164

Towards Diagram Understanding: A Pilot Study Measuring Cognitive Workload Through Eye-Tracking  

DEFF Research Database (Denmark)

We investigate model understanding, in particular , how the quality of the UML diagram layout impacts cognitive load. We hypothesize that this w ill have a significant impact on the structure and effectiveness of engineers’ communication. In previous work, we have studied task performance measurements and subjective assessments; here, we also investigate behavioral indicators such as fixation and pupillary dilation. We use such indicators to explore diagram understanding- and reading strategies and how such strategies are impacted, e.g. by diagram type and expertise level. In the pilot eye-tracking experiment run so far, we have only examined a small number of participants (n=4), so our results are preliminary in nature and do not afford far reaching conclusions. They do, however, corroborate findings from earlier experiments, for example, showing that layout quality indeed matters and improves understanding. Our results also give rise to a number of new hypotheses about diagram understanding strategies thatwe are investigating in an ongoing data acquisition campaign.

Maier, Anja; Baltsen, Nick

2014-01-01

165

Non-Planar On-Shell Diagrams  

CERN Document Server

We initiate a systematic study of non-planar on-shell diagrams in N=4 SYM and develop powerful technology for doing so. We introduce canonical variables generalizing face variables, which make the dlog form of the on-shell form explicit. We present a general classification of arbitrary on-shell diagrams in terms of two classes of combinatorial objects: generalized matching and matroid polytopes. We propose a boundary measurement that connects general on-shell diagrams to the Grassmannian. Our proposal exhibits two important and non-trivial properties: positivity in the planar case and its generalization for non-planar diagrams, and it matches the combinatorial description of the diagrams in terms of matroid polytopes. We present a comprehensive discussion of equivalence and reductions for non-planar diagrams and explain how they are captured by the generalized matching and matroid polytopes. Interestingly, non-planar diagrams exhibit novel phenomena, such as the emergence of constraints on Pl\\"ucker coordinat...

Franco, Sebastian; Penante, Brenda; Wen, Congkao

2015-01-01

166

An Implementation of an Execution Engine for the Foundational UML Subset  

OpenAIRE

This thesis examines an OMG proposal for a tool-chain for working with Executable UML. The proposal defines a subset of UML, called fUML, with well-defined semantics and an Execution Model. The goal of this thesis is to understand whether fUML models can be useful in commercial user interface development. The idea is that an executable model (1) receives input from the data layer, which triggers an execution of the model, (2) transforms the data according to the model, i.e., executes the mode...

Rundlo?f, Magnus

2010-01-01

167

Global quantum Hall phase diagram from visibility diagrams  

CERN Document Server

We propose a construction of a global phase diagram for the quantum Hall effect. This global phase diagram is based on our previous constructions of visibility diagrams in the context of the Quantum Hall Effect. The topology of the phase diagram we obtain is in good agreement with experimental observations (when the spin effect can be neglected). This phase diagram does not show floating.

Chandelier, F; Masson, T; Wallet, J C; Chandelier, Frederique; Georgelin, Yvon; Masson, Thierry; Wallet, Jean-Christophe

2002-01-01

168

Hertzsprung-Russell Diagram  

Science.gov (United States)

This activity teaches students about the Hertzsprung-Russell diagram. The students will first describe differences between near and bright stars. Then they will discern a relationship between temperature and brightness. Finally they will correlate the evolution of stars to plotting the H-R diagram.

Slater, Tim P.

2004-07-16

169

Behavioral Modeling of WSN MAC Layer Security Attacks: A Sequential UML Approach  

DEFF Research Database (Denmark)

Wireless sensor networks (WSNs) are growing enormously and becoming increasingly attractive for a variety of application areas such as tele-health monitoring, industry monitoring, home automation and many more. The primary weakness shared by all wireless application and technologies is the vulnerability to security attacks/threats. The performance and behavior of a WSN are vastly affected by such attacks. In order to be able to better address the vulnerabilities of WSNs in terms of security, it is important to understand the behavior of the attacks. This paper addresses the behavioral modeling of medium access control (MAC) security attacks in WSNs. The MAC layer is responsible for energy consumption, delay and channel utilization of the network and attacks on this layer can introduce significant degradation of the individual sensor nodes due to energy drain and in performance due to delays. The behavioral modeling of attacks will be beneficial for designing efficient and secure MAC layer protocols. The security attacks are modeled using a sequential diagram approach of Unified Modeling Language (UML). Further, a new attack definition, specific to hybrid MAC mechanisms, is proposed.

Pawar, Pranav M.; Nielsen, Rasmus Hjorth

2012-01-01

170

Logical reasoning with diagrams  

CERN Document Server

PART A: Theoretical Issues. 1. Visual Information and Valid Reasoning, Jon Barwise and John Etchemendy. 2. Operational Constraints in Diagrammatic Reasoning, Atsushi Shimojima. 3. Diagrams and the Concept of Logical System, Jon Barwise and Eric Hammer. PART B: Case Studies. 4. Situation-Theoretic Account of Valid Reasoning with Venn Diagrams, Sun-Joo Shin. 5. Towards a Model Theory of Venn Diagrams, eric Hammer and Norman Danner. 6. Peircean Graphs for Propositional Logic, Eric Hammer. 7. A Diagrammatic Subsystem of Hilbert''s Geometry, Isabel Luengo. PART C: Heterogenous Systems. 8. Heterogenous Logic, Jon Barwise and John Etchemendy. 9. Toward the Rigorous Use of Diagrams in Reasoning about Hardware, Steven D. Johnson, Jon Barwise, and Gerard Allwein. 10. Exploiting the Potential of Diagrams in Guiding Hardware Reasoning, Kathi D. Fisler

Allwein, Gerard

1996-01-01

171

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

2013-02-01

172

Experiences in Model Driven Verification of Behavior with UML  

Science.gov (United States)

Model Driven Development (MDD) focuses on the intensive use of models during software development. In this paradigm, models are the central development artifact: transformations are used to derive executable programs, or tests for a given platform. This makes building quality models a cost-effective approach, as the models can be reused for many analysis or generation goals, and not just document a design. However, high quality models are needed for the approach to be successful. Hence the goal of performing analysis of high-level behavioral specifications such as UML, to enhance their quality and detect defects or ensure desired behavior.

Kordon, Fabrice; Thierry-Mieg, Yann

173

Applying UML and MDA to Real Systems Design  

CERN Document Server

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

174

reutilizables con XML, UML e IMS-LD  

Directory of Open Access Journals (Sweden)

Full Text Available Se analiza la especificación IMS-Learning Design (LD, que permite el diseño de procesos de enseñanza-aprendizaje en forma de modelos registrados en archivos xml fácilmente reutilizables. Se valora la utilidad del estándar de modelado de sistemas denominado UML (Unified Modeling Language para establecer meta-modelos en la especificación IMS-LD, así como para elaborar modelos dinámicos que reflejen la organización de las actividades de un proceso de enseñanza-aprendizaje. Finalmente, se justifica la necesidad de disponer de herramientas informáticas para el diseño y ejecución de los procesos, de forma similar a como ocurre con los sistemas de workflow.

Jos\\u00E9 R. Hilera

2005-01-01

175

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

176

Complexity, Heegaard diagrams and generalized Dunwoody manifolds  

CERN Document Server

We deal with Matveev complexity of compact orientable 3-manifolds represented via Heegaard diagrams. This lead us to the definition of modified Heegaard complexity of Heegaard diagrams and of manifolds. We define a class of manifolds which are generalizations of Dunwoody manifolds, including cyclic branched coverings of two-bridge knots and links, torus knots, some pretzel knots, and some theta-graphs. Using modified Heegaard complexity, we obtain upper bounds for their Matveev complexity, which linearly depend on the order of the covering. Moreover, using homology arguments due to Matveev and Pervova we obtain lower bounds.

Cattabriga, Alessia; Vesnin, Andrei

2009-01-01

177

Modal Object Diagrams  

OpenAIRE

While object diagrams (ODs) are widely used as a means to document object-oriented systems, they are expressively weak, as they are limited to describe specific possible snapshots of the system at hand. In this paper we introduce modal object diagrams (MODs), which extend the classical OD language with positive/negative and example/invariant modalities. The extended language allows the designer to specify not only positive example models but also negative examples, ones that...

Maoz, Shahar; Ringert, Jan Oliver; Rumpe, Bernhard

2014-01-01

178

Grid diagrams and shellability  

OpenAIRE

We explore a somewhat unexpected connection between knot Floer homology and shellable posets, via grid diagrams. Given a grid presentation of a knot K inside S^3, we define a poset which has an associated chain complex whose homology is the knot Floer homology of K. We then prove that the closed intervals of this poset are shellable. This allows us to combinatorially associate a PL flow category to a grid diagram.

Sarkar, Sucharit

2009-01-01

179

Corpus-based Approach to Creating a Semantic Lexicon for Clinical Research Eligibility Criteria from UMLS.  

Science.gov (United States)

We describe a corpus-based approach to creating a semantic lexicon using UMLS knowledge sources. We extracted 10,000 sentences from the eligibility criteria sections of clinical trial summaries contained in ClinicalTrials.gov. The UMLS Metathesaurus and SPECIALIST Lexical Tools were used to extract and normalize UMLS recognizable terms. When annotated with Semantic Network types, the corpus had a lexical ambiguity of 1.57 (=total types for unique lexemes / total unique lexemes) and a word occurrence ambiguity of 1.96 (=total type occurrences / total word occurrences). A set of semantic preference rules was developed and applied to completely eliminate ambiguity in semantic type assignment. The lexicon covered 95.95% UMLS-recognizable terms in our corpus. A total of 20 UMLS semantic types, representing about 17% of all the distinct semantic types assigned to corpus lexemes, covered about 80% of the vocabulary of our corpus. PMID:21347142

Luo, Zhihui; Duffy, Robert; Johnson, Stephen; Weng, Chunhua

2010-01-01

180

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.

Jiri Zahradnik

2003-01-01

181

Geometries from Young diagrams  

International Nuclear Information System (INIS)

Type IIB string theory on spacetimes that are asymptotically AdS5 x S5 can be defined using four dimensional N = 4 super Yang-Mills theory. Six of the dimensions of the string theory are holographically reconstructed in the Yang-Mills theory. In this article we study how these dimensions and local physics in these dimensions emerge. We reorganize the dynamics of the 1/2 BPS sector of the field theory by rewriting it in terms of Schur polynomials. The Young diagram labeling of these polynomials can be viewed as a book keeping device which summarizes how the operator is constructed. We show that aspects of the geometry of the extra holographic dimensions are captured very naturally by the Young diagram. Gravitons which are localized at a specific position in the bulk correspond to boxes added at a specific location on the Young diagram.

182

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

183

Automatic generation of CSP||B skeletons from xUML models  

OpenAIRE

CSP||B is a formal approach to specification that combines CSP and B. In this paper we present our tool that automatically translates a subset of executable UML (xUML) models into CSP parallel to B, for the purpose of verification and increased validation at the early stages of a software engineering development lifecycle. The tool is being developed for our industrial collaborators, AWE plc, in order to strengthen their software engineering process which uses xUML. As part of this process, A...

Turner, E.; Treharne, H.; Schneider, S.; Evans, N.

2008-01-01

184

Object Oriented Query Response Time for UML Models  

Directory of Open Access Journals (Sweden)

Full Text Available Nowadays, the size of database of any business organization is increasing and many of the companies are shifted the old structured database into the object oriented database. Due to increase of size of database complexity of database is increasing therefore, it is necessary to optimize the object oriented query response time from the complex object oriented database. In the present paper, a real case study of Life Insurance Corporation of India is taken and sample object oriented database is designed by the use of SQL Server 2008. A UML model is designed for computing the object oriented query response time. Table and graph are also represented for the computed records in five runs.

Santosh Kumar

2012-07-01

185

UML Model Transformation for a Product Line Design  

Directory of Open Access Journals (Sweden)

Full Text Available There is a tremendous growth in computer and electronics industry in this era. This growth has made a major impact on hardware and software resources. A gap has occurred in designing the hardware resource because, only optimal amount of hardware resources is being used for an application development. The complexity of the design and the scarcity of time (for marketing require a standard procedural approach, to address problems such as validation, synthesis, verification and testing. We have proposed a procedural approach for the completeness of the hardware and software systems with lesseffort. We have created an executable model for the application. This model includes different software and hardware modules.A UML based compiler and a hardware-software co-simulation tool is used in ourprocedural approach, for reconfiguring the architectures and aids validation, verification, mapping and synthesis of the application with limited amount of effort.

R. Aroulcanessane

2013-10-01

186

The UMLS Semantic Network and the Semantic Web.  

Science.gov (United States)

The Unified Medical Language System is an extensive source of biomedical knowledge developed and maintained by the US National Library of Medicine (NLM) and is being currently used in a wide variety of biomedical applications. The Semantic Network, a component of the UMLS is a structured description of core biomedical knowledge consisting of well defined semantic types and relationships between them. We investigate the expressiveness of DAML+OIL, a markup language proposed for ontologies on the Semantic Web, for representing the knowledge contained in the Semantic Network. Requirements specific to the Semantic Network, such as polymorphic relationships and blocking relationship inheritance are discussed and approaches to represent these in DAML+OIL are presented. Finally, conclusions are presented along with a discussion of ongoing and future work. PMID:14728193

Kashyap, Vipul

2003-01-01

187

Rerendering Semantic Ontologies Automatic Extensions to UMLS through Corpus Analytics  

CERN Document Server

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

188

Extending UML for trajectory data warehouses conceptual modelling  

Directory of Open Access Journals (Sweden)

Full Text Available The new positioning and information capture technologies are able to treat data related to moving objects taking place in targeted phenomena. This gave birth to a new data source type called trajectory data (TD which handle information related to moving objects. Trajectory Data must be integrated in a new data warehouse type called trajectory data warehouse (TDW that is essential to model and to implement in order to analyze and understand the nature and the behavior of movements of objects in various contexts. However, classical conceptual modeling does not incorporate the specificity of trajectory data due to the complexity of their components that are spatial, temporal and thematic (semantic. For this reason, we focus in this paper on presenting the conceptual modeling of the trajectory data warehouse by defining a new profile using the StarUML extensibility mechanism

Wided Oueslati

2012-12-01

189

Toward a Human-Centered Uml for Risk Analysis  

CERN Document Server

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

190

Reading Diagrams. Pipefitter.  

Science.gov (United States)

Developed by the ABCs of Construction National Workplace Literacy Project, these curriculum materials for the occupational area of pipefitting contain a lesson that deals with reading diagrams. The lesson consists of an objective, instruction, and 10 exercises. Three types of problems are provided in each exercise: "try it,""apply it," and "go…

Greater Baton Rouge Chamber of Commerce, LA.

191

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

2004-01-01

192

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 SciELO Brazil | Language: Spanish 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 a [...] lumnos 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.

Yosajandi, Pérez Campillo; José Antonio, Chamizo Guerrero.

193

Applying AUML and UML 2 in the Multi-agent Systems Project  

Science.gov (United States)

This article discusses the viability of the AUML and UML languages employment, from the latter's version 2.0 on, in the multi-agent systems project. In this article some works that have used UML for the project of systems that involved agents, as well as some AOSE (Agent Oriented Software Engineering) methodologies that use in some way UML or AUML (or both), are presented. Immediately afterwards the article approaches the AUML language, highlighting the innovations proposed by same and how it can be applied to the multi-agent systems project, identifying its advantages and disadvantages. After that, the paper passes on to describe how UML, from its version 2.0 on, has bypassed AUML and how the former can be applied to the multiagent systems project, pinpointing its positive aspects and its deficiencies.

Guedes, Gilleanes Thorwald Araujo; Vicari, Rosa Maria

194

Una estrategia para alcanzar correctitud y completitud, minimizando la ambigüedad en una SRS escrita con UML  

OpenAIRE

Es sabido que la correctitud, completitud y no ambigüedad son atributos de calidad más que deseables en una SRS [Davis92] (Especificación de Requerimientos de Software). Aquí presento una propuesta de cómo escribir una SRS con UML maximizando dichos atributos, mediante una estrategia de utilización de diagramas UML que nos llevan de una manera natural a un producto con un alto grado de correctitud, completitud y no ambiguo.

Luzuriaga, Juan Manuel

2004-01-01

195

Vérification d'une architecture UML 2.0 avec l'ADL Wright  

OpenAIRE

UML2.0 offre des nouveaux concepts tels que composant, port, interfaces offertes, interfaces requises, connecteur, structure composite permettant de décrire une architecture logicielle. Mais UML2.0 ne permet pas l?étude formelle de deux critères fondamentaux sur une architecture logicielle qui sont la cohérence et la complétude. Par contre certains ADL comme Wright autorisent une telle étude. Dans cet article, nous préconisons une approche de traduction permettant de transformer une a...

Graiet, Mohamed; Tahar Bhiri, Mohamed; Giraudin, Jean-pierre; Hamadou, Abdelmaj

2005-01-01

196

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

OpenAIRE

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 hardware verification testbenches. This document is organised into sections corresponding to the main constructs of the Hardware Verification Language. For each of these constructs we present: 1) a snippet of c...

Linehan, Eamonn; Clarke, Siobha?n

2010-01-01

197

Indexing Anatomical Phrases in Neuro-Radiology Reports to the UMLS 2005AA  

OpenAIRE

This work describes a methodology to index anatomical phrases to the 2005AA release of the Unified Medical Language System (UMLS). A phrase chunking tool based on Natural Language Processing (NLP) was developed to identify semantically coherent phrases within medical reports. Using this phrase chunker, a set of 2,551 unique anatomical phrases was extracted from brain radiology reports. These phrases were mapped to the 2005AA release of the UMLS using a vector space model. Pr...

Bashyam, Vijayaraghavan; Taira, Ricky K.

2005-01-01

198

Eine formale Semantik für die Verknüpfung von Verhaltensbeschreibungen in der UML 2  

OpenAIRE

Software development should proceed continuously from requirements through specification to implementation, using an integrated formalism, method and tool set. A state-of-the-art proposal aiming at such an integrated approach is to use Model Driven Software Development (MDSD) as the method and the Unified Modelling Language (UML) as the formalism. While the UML can be profitably used to describe requirements and specifications, one of its shortcomings is the lack of a precise semantics. Th...

Kohlmeyer, Jens

2009-01-01

199

Trion ladder diagrams  

CERN Document Server

We first derive a new ``commutation technique'' for an exciton interacting with electrons, inspired from the one we recently developed for excitons interacting with excitons. These techniques allow to take \\emph{exactly} into account the possible exchanges between carriers. We use it to get the $\\mathrm{X}^-$ trion creation operator in terms of exciton and free-electron creation operators. In a last part we generate the ladder diagrams associated to these trions. Although similar to the exciton ladder diagrams, with the hole replaced by an exciton, they are actually much more tricky : (i) Due to the composite nature of the exciton, one cannot identify an exciton-electron potential similar to the Coulomb potential between electron and hole ; (ii) the spins are unimportant for excitons while they are crucial for trions, singlet and triplet states having different energies.

Combescot, M

2002-01-01

200

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

201

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

202

An Introduction to Tree Diagrams  

Science.gov (United States)

This brief article describes the use of tree diagrams in calculating probabilities. The author provides examples of how tree diagrams are used to calculate specific probabilities and why the language chosen relates to the operations used to find the probability.

Cork, Stu

2014-01-01

203

Conservative Generalized Bifurcation Diagrams  

OpenAIRE

Bifurcation cascades in conservative systems are shown to exhibit a generalized diagram, which contains all relevant informations regarding the location of periodic orbits (resonances), their width (island size), irrational tori and the infinite higher-order resonances, showing the intricate way they are born. Contraction rates for islands sizes, along period-doubling bifurcations, are estimated to be $\\alpha_I\\sim 3.9$. Results are demonstrated for the standard map and for ...

Manchein, Cesar; Beims, Marcus W.

2012-01-01

204

TEP process flow diagram  

Energy Technology Data Exchange (ETDEWEB)

This presentation describes the development of the proposed Process Flow Diagram (PFD) for the Tokamak Exhaust Processing System (TEP) of ITER. A brief review of design efforts leading up to the PFD is followed by a description of the hydrogen-like, air-like, and waterlike processes. Two new design values are described; the mostcommon and most-demanding design values. The proposed PFD is shown to meet specifications under the most-common and mostdemanding design values.

Wilms, R Scott [Los Alamos National Laboratory; Carlson, Bryan [Los Alamos National Laboratory; Coons, James [Los Alamos National Laboratory; Kubic, William [Los Alamos National Laboratory

2008-01-01

205

The Tinsley diagram revisited  

CERN Document Server

Motivated by the recent determinations of the Hubble constant (H_0) from observations of Cepheid variables in NGC4571 and M100, we plot the Tinsley diagram with level curves of the cosmological constant (\\Lambda). Based on current estimates of the absolute ages of globular clusters we conclude that \\Lambda > 0 and, irrespective of the background spatial curvature, the universe will not recollapse. These conclusions hold for both relativistic and Newtonian models and are {\\it independent} of the density parameter.

Leonard, S; Leonard, Stephen; Lake, Kayll

1995-01-01

206

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

207

Compressing Binary Decision Diagrams  

CERN Document Server

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

208

TEP process flow diagram  

International Nuclear Information System (INIS)

This presentation describes the development of the proposed Process Flow Diagram (PFD) for the Tokamak Exhaust Processing System (TEP) of ITER. A brief review of design efforts leading up to the PFD is followed by a description of the hydrogen-like, air-like, and waterlike processes. Two new design values are described; the mostcommon and most-demanding design values. The proposed PFD is shown to meet specifications under the most-common and mostdemanding design values.

209

Voronoi diagrams and their applications  

OpenAIRE

In these theses are pepresented the Voronoi diagram and Network Voronoi diagram. The shortest path Dijkstra’s algorithm was modified in this way that calculates shortest paths from several Voronoi generators at the same time. The first result - partition of the nodes of the network. The seond result - arcs of the network are attributed to the generators, considering especially their direction and asymmetric costs. Applications allow compare Network Voronoi diagrams to Voronoi diagrams. For ...

Z?vikaite?, Laura

2005-01-01

210

Phase diagram of supercooled water confined to hydrophilic nanopores  

OpenAIRE

We present a phase diagram for water confined to cylindrical silica nanopores in terms of pressure, temperature and pore radius. The confining cylindrical wall is hydrophilic and disordered, which has a destabilizing effect on ordered water structure. The phase diagram for this class of systems is derived from general arguments, with parameters taken from experimental observations and computer simulations and with assumptions tested by computer simulation. Phase space divide...

Limmer, David T.; Chandler, David

2012-01-01

211

Automation of Feynman diagram evaluations  

International Nuclear Information System (INIS)

A C-program DIANA (DIagram ANAlyser) for the automation of Feynman diagram evaluations is presented. It consists of two parts: the analyzer of diagrams and the interpreter of a special text manipulating language. This language can be used to create a source code for analytical or numerical evaluations and to keep the control of the process in general

212

Dynamic Weaving of Aspect-Oriented Executable UML Models  

Science.gov (United States)

Several efforts have been made to incorporate aspect-oriented abstractions into the modelling level. Several modelling languages have appeared, which are mainly UML extensions that incorporate aspect-oriented constructions (e.g. advices or pointcuts). Although these extensions help to improve the modularisation of software designs, their incorporation makes it more complex to understand how the model works after being composed (e.g. woven). In order to overcome this problem, different aspect-oriented model weavers, such as Motorola WEAVR, AOEM and KerTheme, were proposed. These weavers provide the infrastructure for testing and debugging the models before moving into an implementation. However, these model weavers are static in the sense that aspects cannot be woven and unwoven at run time (i.e. during model execution). Hence, software systems that require dynamic weaving (e.g. adaptive applications) are not properly supported. Reasoning about this kind of application can be more complex due to the intrinsic dynamic nature. The novel contribution of this work is an aspect-oriented dynamic model weaver that can be used for running aspect-oriented models where aspects are woven and unwoven during model execution. These ideas are illustrated using a location-aware intelligent transportation system.

Fuentes, Lidia; Sánchez, Pablo

213

AUTOMATIZACIÓN DE LA ARQUITECTURA DE COMPONENTES GENÉRICOS USANDO UML  

Directory of Open Access Journals (Sweden)

Full Text Available

 

La arquitectura de componentes genéricos permite chequear la consistencia interna de sus elementos arquitectónicos (componentes y conectores a partir de las relaciones internas en sus respectivas estructuras, que pueden ser de inclusión y transformación. También permite verificar la conexión entre componentes y conectores a partir de las relaciones de transformación entre sus interfaces respectivas. Las ideas que se presentan aquí constituyen una propuesta para la automatización de la descripción de esta arquitectura usando el lenguaje de modelado unificado (UML a partir de la descripción formal de sus diagramas de clases y de secuencia, así como para el chequeo de la consistencia. En este artículo se muestra la aplicación de esta propuesta mediante una extensión de la herramienta Visual Paradigm, por medio de un módulo de software conectable.

Noel Fuentes Ramírez

2006-04-01

214

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

2009-09-01

215

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

216

Conservative generalized bifurcation diagrams  

International Nuclear Information System (INIS)

Bifurcation cascades in conservative systems are shown to exhibit a generalized diagram, which contains all relevant informations regarding the location of periodic orbits (resonances), their width (island size), irrational tori and the infinite higher-order resonances, showing the intricate way they are born. Contraction rates for islands sizes, along period-doubling bifurcations, are estimated to be ?I?3.9. Results are demonstrated for the standard map and for the continuous Hénon–Heiles potential. The methods used here are very suitable to find periodic orbits in conservative systems, and to characterize the regular, mixed or chaotic dynamics as the nonlinear parameter is varied.

217

Conservative generalized bifurcation diagrams  

Energy Technology Data Exchange (ETDEWEB)

Bifurcation cascades in conservative systems are shown to exhibit a generalized diagram, which contains all relevant informations regarding the location of periodic orbits (resonances), their width (island size), irrational tori and the infinite higher-order resonances, showing the intricate way they are born. Contraction rates for islands sizes, along period-doubling bifurcations, are estimated to be ?{sub I}?3.9. Results are demonstrated for the standard map and for the continuous Hénon–Heiles potential. The methods used here are very suitable to find periodic orbits in conservative systems, and to characterize the regular, mixed or chaotic dynamics as the nonlinear parameter is varied.

Manchein, Cesar, E-mail: cmanchein@gmail.com [Departamento de Física, Universidade do Estado de Santa Catarina, 89219-710 Joinville (Brazil); Beims, Marcus W., E-mail: mbeims@fisica.ufpr.br [Departamento de Física, Universidade Federal do Paraná, 81531-980 Curitiba (Brazil)

2013-04-01

218

Uml2 is a novel CalB-type lipase of Ustilago maydis with phospholipase A activity.  

Science.gov (United States)

CalB of Pseudozyma aphidis (formerly named Candida antarctica) is one of the most widely applied enzymes in industrial biocatalysis. Here, we describe a protein with 66 % sequence identity to CalB, designated Ustilago maydis lipase 2 (Uml2), which was identified as the product of gene um01422 of the corn smut fungus U. maydis. Sequence analysis of Uml2 revealed the presence of a typical lipase catalytic triad, Ser-His-Asp with Ser125 located in a Thr-Xaa-Ser-Xaa-Gly pentapeptide. Deletion of the uml2 gene in U. maydis diminished the ability of cells to hydrolyse fatty acids from tributyrin or Tween 20/80 substrates, thus demonstrating that Uml2 functions as a lipase that may contribute to nutrition of this fungal pathogen. Uml2 was heterologously produced in Pichia pastoris and recombinant N-glycosylated Uml2 protein was purified from the culture medium. Purified Uml2 released short- and long-chain fatty acids from p-nitrophenyl esters and Tween 20/80 substrates. Furthermore, phosphatidylcholine substrates containing long-chain saturated or unsaturated fatty acids were effectively hydrolysed. Both esterase and phospholipase A activity of Uml2 depended on the Ser125 catalytic residue. These results indicate that Uml2, in contrast to CalB, exhibits not only esterase and lipase activity but also phospholipase A activity. Thus, by genome mining, we identified a novel CalB-like lipase with different substrate specificities. PMID:24469105

Buerth, Christoph; Kovacic, Filip; Stock, Janpeter; Terfrüchte, Marius; Wilhelm, Susanne; Jaeger, Karl-Erich; Feldbrügge, Michael; Schipper, Kerstin; Ernst, Joachim F; Tielker, Denis

2014-06-01

219

Investigational new insulin glargine 300 U/ml has the same metabolism as insulin glargine 100 U/ml.  

Science.gov (United States)

Insulin glargine is processed in vivo into soluble 21(A) -Gly-human insulin (M1), the principal moiety responsible for metabolic effects, and subsequently into M2. This sub-study compared metabolism and metabolite pharmacokinetic (PK) profiles of investigational new insulin glargine U300 (Gla-300) with insulin glargine 100 U/ml (Gla-100, Lantus®, Sanofi-Aventis Deutschland GmbH, Frankfurt am Main, Germany) in people with type 1 diabetes. Participants received 0.4 (n = 18) or 0.6 U/kg Gla-300 (n = 12), and 0.4 U/kg Gla-100 (n = 30) once daily in randomized order for 8 days prior to a 36-h euglycaemic clamp. Metabolites were quantified using immunoaffinity enrichment and liquid chromatography tandem mass spectrometry (LC-MS/MS). Glargine metabolism was the same regardless of Gla-100 or Gla-300 administration; M1 was confirmed as the principal active moiety circulating in blood. Steady state concentrations of M1 were achieved after 2 days for Gla-100, and 4 days for Gla-300. Steady state M1 values defined prolonged and even flatter PK profiles after Gla-300 administration compared with M1 profiles after Gla-100. PMID:24571126

Steinstraesser, A; Schmidt, R; Bergmann, K; Dahmen, R; Becker, R H A

2014-09-01

220

Methods for Exploring the Semantics of the Relationships between Co-occurring UMLS Concepts  

Science.gov (United States)

Objective To characterize the relationships among UMLS concepts that co-occur as MeSH descriptors in MEDLINE citations (1990-1999). Design 18,485 UMLS concepts involved in 7,928,608 directed pairs of co-occurring concepts were studied. For each directed pair of concepts C1-C2: (i) the “family” of C1 was built, using the UMLS Metathesaurus, and we tested whether or not C2 belonged to C1's family; (ii) we used the semantic categorization of Metathesaurus concepts through the UMLS Semantic Network and Semantic Groups to represent the semantics of the relationships between C1 and C2. Results In 6.5% of the directed pairs, the co-occurring concept C2 was found within the “family” of C1. Detailed results are given. The most frequent co-occurrences involved “Chemicals & Drugs” and “Chemicals & Drugs”, as well as “Disorders” and “Chemicals & Drugs”. Discussion This work takes advantage of both symbolic and statistical information represented in the UMLS, and analyzes their overlap. Further research is suggested. PMID:11604727

Burgun, Anita; Bodenreider, Olivier

2015-01-01

221

Sintering diagrams of UO2  

International Nuclear Information System (INIS)

Ashby's method (see Acta Met., vol. 22, p. 275, 1974) of constructing sintering diagrams has been modified to obtain contribution diagrams directly from the computer. The interplay of sintering variables and mechanisms are studied and the factors that affect the participation of mechanisms in UO2 are determined. By studying the physical properties, it emerges that the order of inaccuracies is small in most cases and do not affect the diagrams. On the other hand, even a 10% error in activation energies, which is quite plausible, would make a significant difference to the diagram. The main criticism of Ashby's approach is that the numerous properties and equations used, communicate their inaccuracies to the diagrams and make them unreliable. The present study has considerably reduced the number of factors that need to be refined to make the sintering diagrams more meaningful. (Auth.)

222

Behind the folding funnel diagram.  

Science.gov (United States)

This Commentary clarifies the meaning of the funnel diagram, which has been widely cited in papers on protein folding. To aid in the analysis of the funnel diagram, this Commentary reviews historical approaches to understanding the mechanism of protein folding. The primary role of free energy in protein folding is discussed, and it is pointed out that the decrease [corrected] in the configurational entropy as the native state is approached hinders folding, rather than guiding it. Diagrams are introduced that provide a less ambiguous representation of the factors governing the protein folding reaction than the funnel diagram. PMID:21685880

Karplus, Martin

2011-07-01

223

Integrating Software Architecture Concepts into the MDA Platform with UML Profile  

Directory of Open Access Journals (Sweden)

Full Text Available Architecture Description Languages (ADLs provide an abstract representation of software systems. Achieving a concrete mapping of such representation into the implementation is one of the principal aspects of MDA (Model Driven Architecture. Integration of ADLs within MDA confers to the MDA platform a higher level of abstraction and a degree of reuse of ADLs. Indeed they have significantly different platform metamodels which make the definition of mapping rules complex. This complexity is clearly noticeable when some software architecture concepts cannot be easily mapped to MDA platform. In this research, we propose to integrate software architecture within MDA. We define also strategy for direct transformation using a UML profile. It represents both software architecture model (PIM and MDA platform model (PSM in UML meta-model then elaborates transformation rules between results UML meta-models. The goal is to automate the process of deriving implementation platform from software concepts.

Adel Alti

2007-01-01

224

Analyzing polysemous concepts from a clinical perspective: Application to auditing concept categorization in the UMLS  

Science.gov (United States)

Objectives Polysemy is a frequent issue in biomedical terminologies. In the Unified Medical Language System (UMLS), polysemous terms are either represented as several independent concepts, or clustered into a single, multiply-categorized concept. The objective of this study is to analyze polysemous concepts in the UMLS through their categorization and hierarchical relations for auditing purposes. Methods We used the association of a concept with multiple Semantic Groups (SGs) as a surrogate for polysemy. We first extracted multi-SG (MSG) concepts from the UMLS Metathesaurus and characterized them in terms of the combinations of SGs with which they are associated. We then clustered MSG concepts in order to identify major types of polysemy. We also analyzed the inheritance of SGs in MSG concepts. Finally, we manually reviewed the categorization of the MSG concepts for auditing purposes. Results The 1208 MSG concepts in the Metathesaurus are associated with 30 distinct pairs of SGs. We created 75 semantically homogeneous clusters of MSG concepts, and 276 MSG concepts could not be clustered for lack of hierarchical relations. The clusters were characterized by the most frequent pairs of semantic types of their constituent MSG concepts. MSG concepts exhibit limited semantic compatibility with their parent and child concepts. A large majority of MSG concepts (92%) are adequately categorized. Examples of miscategorized concepts are presented. Conclusion This work is a systematic analysis and manual review of all concepts categorized by multiple SGs in the UMLS. The correctly-categorized MSG concepts do reflect polysemy in the UMLS Metathesaurus. The analysis of inheritance of SGs proved useful for auditing concept categorization in the UMLS. PMID:19303057

Mougin, Fleur; Bodenreider, Olivier; Burgun, Anita

2015-01-01

225

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

226

Physiology Flow-Diagram Models  

Science.gov (United States)

A set of physiology flow-diagrams for the cardiovascular system, cardiac auto-rhythmic cell, cardiac contractile cell, respiratory system, coagulation/hemostasis, digestive system, excretion, and autonomic nervous system. These flow-diagrams show cause-and-effect markup and have accompanying tutorials.

PhD Sandra J Bruner (Polk Community College Biology)

2005-10-04

227

Arc numbers from Gauss diagrams  

OpenAIRE

We characterize planar diagrams which may be divided into n arc embeddings in terms of their chord diagrams, generalizing a result of Taniyama for the case n = 2. Two algorithms are provided, one which finds a minimal arc embedding (in quadradic time in the number of crossings), and one which constructs a minimal subdiagram having same arc number as D.

Hagge, Tobias

2010-01-01

228

Cohomology of diagrams of algebras  

OpenAIRE

We consider cohomology of diagrams of algebras by Beck's approach, using comonads. We then apply this theory to computing the cohomology of $\\Psi$-rings. Our main result is that there is a spectral sequence connecting the cohomology of the diagram of an algebra to the cohomology of the underlying algebra.

Robinson, Michael

2008-01-01

229

Planar diagrams from optimization  

OpenAIRE

We propose a new toy model of a heteropolymer chain capable of forming planar secondary structures typical for RNA molecules. In this model the sequential intervals between neighboring monomers along a chain are considered as quenched random variables. Using the optimization procedure for a special class of concave--type potentials, borrowed from optimal transport analysis, we derive the local difference equation for the ground state free energy of the chain with the planar ...

Nechaev, S. K.; Sobolevski, A. N.; Valba, O. V.

2012-01-01

230

The story of Feynman diagrams  

International Nuclear Information System (INIS)

Physicists are no strangers to Feynman diagrams, but the meaning of the diagrams is not always clear, even to those who have used them. That confusion has deep roots, as Kaiser clearly and convincingly explains. To Feynman himself, a diagram depicted an actual physical process in space-time, such as the exchange of photons that occurs when an electron and proton collide. However, he also saw it as shorthand for the contributions to the amplitude of a physical process made by the element of the process it depicted. The best part of this new book covers the early history, social history and 'conceptual history' of Feynman diagrams. Disagreements and criticisms aside, the book will be invaluable to historians and sociologists of physics interested in the growth of Feynman diagrams. (U.K.)

231

Teaching Tip: Using Activity Diagrams to Model Systems Analysis Techniques: Teaching What We Preach  

Science.gov (United States)

Activity diagrams are used in Systems Analysis and Design classes as a visual tool to model the business processes of "as-is" and "to-be" systems. This paper presents the idea of using these same activity diagrams in the classroom to model the actual processes (practices and techniques) of Systems Analysis and Design. This tip…

Lending, Diane; May, Jeffrey

2013-01-01

232

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)

233

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

2007-03-01

234

Dynamic power management for UML modeled applications on multiprocessor SoC  

Science.gov (United States)

The paper presents a novel scheme of dynamic power management for UML modeled applications that are executed on a multiprocessor System-on-Chip (SoC) in a distributed manner. The UML models for both application and architecture are designed according to a well-defined UML profile for embedded system design, called TUT-Profile. Application processes are considered as elementary units of distributed execution, and their mapping on a multiprocessor SoC can be dynamically changed at run-time. Our approach on the dynamic power management balances utilized processor resources against current workload at runtime by (1) observing the processor and workload statistics, (2) re-evaluating the amount of required resources (i.e. the number of active processors), and (3) re-mapping the application processes to the minimum set of active processors. The inactive processors are set to a power-save state by using clock-gating. The approach integrates the well-known power management techniques tightly with the UML based design of embedded systems in a novel way. We evaluated the dynamic power management with a WLAN terminal implemented on a multiprocessor SoC on Altera Stratix II FPGA containing up to five Nios II processors and dedicated hardware accelerators. Measurements proved up to 21% savings in the power consumption of the whole FPGA board.

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

2007-02-01

235

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

Directory of Open Access Journals (Sweden)

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 P\\u00E9rez Lamancha

2008-01-01

236

Nonabelian Cut Diagrams and their Applications  

OpenAIRE

A new kind of cut diagram is introduced to sum Feynman diagrams with nonabelian vertices. Unlike the Cutkosky diagrams which compute the discontinuity of single Feynman diagrams, the nonabelian cut diagrams represent a resummation of both the real and the imaginary parts of Feynman diagrams related by permutations. Several applications of the technique are reported, including a resolution of the apparent inconsistency of the baryon problem in large-$N_c$ QCD, a simplified ca...

Lam, C. S.

1996-01-01

237

Diagrams and Proofs in Analysis  

DEFF Research Database (Denmark)

The article discusses the role of diagrams in mathematical reasoning based on a case study in analysis.   In the presented example certain combinatorial expressions were first found by using diagrams. In the published proofs the pictures are replaced by reasoning about permutation groups. This paper argues that, even though the diagrams are not present in the papers, they still play a role in the formulation of the proofs. It is shown that they play a role in concept formation as well as representations of proofs. In addition we note that `visualizaton' is used in different ways. In the first sense visualization denotes our inner mental pictures, which enables us to see that a certain fact holds, whereas in the other sense, `visualization' denotes a diagram or representation of something.

Carter, Jessica M H Grund

2010-01-01

238

Robot Control Using UML and Multi-agent System  

Directory of Open Access Journals (Sweden)

Full Text Available Increased industrialization and new markets have led to an accumulation of used technical consumer goods, which results in greater exploitation of raw materials, energy and landfill sites. In order to reduce the use of natural resources conserve precious energy and limit the increase in waste volume. The application of disassembly techniques is the first step towards this prevention of waste. These techniques form a reliable and clean approach: "noble" or high-graded recycling. This paper presents a multi agent system for disassembly process, which is implemented in a computer-aided application for supervising of the disassembling system: the Interactive Intelligent Interface for Disassembling System. Unified modeling language diagrams are used for an internal and external definition of the disassembling system.

Ales Pavliska

2003-02-01

239

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

240

Phase Diagrams for Sonoluminescing Bubbles  

OpenAIRE

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 ...

Hilgenfeldt, Sascha; Lohse, Detlef; Brenner, Michael P.

1996-01-01

241

SINR Diagram with Interference Cancellation  

OpenAIRE

In this paper we study the reception zones of a wireless network in the SINR model with receivers that employ \\emph{interference cancellation} (IC), a technique that allows a receiver to decode interfering signals, and \\emph{cancel} them from the received signal in order to decode its intended message. We first derive some important topological properties of the diagram describing the reception zones and their connections to \\emph{high-order Voronoi diagrams} and other relat...

Avin, Chen; Cohen, Asaf; Haddad, Yoram; Kantor, Erez; Lotker, Zvi; Parter, Merav; Peleg, David

2013-01-01

242

Phase Diagram of Doped Manganates  

CERN Document Server

The phase diagram of doped manganate compounds La_{1-x}A_xMnO_3 (with divalent A) is studied. We analyze an extension of the double exchange model using the Schwinger boson formalism. Earlier work by de Gennes on the existence of a canted phase is reproduced, although this phase is shown to be unstable towards phase separation in a broad regime of physical interest. We numerically solve the model's mean field equations and plot its phase diagram.

Arovas, D P; Arovas, Daniel P.; Guinea, Francisco

1997-01-01

243

The Amplituhedron from Momentum Twistor Diagrams  

OpenAIRE

We propose a new diagrammatic formulation of the all-loop scattering amplitudes/Wilson loops in planar N=4 SYM, dubbed the "momentum-twistor diagrams". These are on-shell-diagrams obtained by gluing trivalent black and white vertices defined in momentum twistor space, which, in the reduced diagram case, are known to be related to diagrams in the original twistor space. The new diagrams are manifestly Yangian invariant, and they naturally represent factorization and forward-l...

Bai, Yuntao; He, Song

2014-01-01

244

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

2006-01-01

245

Between Analogue and Digital Diagrams  

OpenAIRE

This essay is about the interstitial. About how the diagram, as a method of design, has lead fromthe analogue deconstruction of the eighties to the digital processes of the turn of the millennium.Specifically, the main topic of the text is the interpretation and the critique of folding (as a diagram)in the beginning of the nineties. It is necessary then to unfold its relationship with immediatelypreceding and following architectural trends, that is to say we have to look both backwards andfor...

Zoltan Bun

2012-01-01

246

The Quasar SED Mixing Diagram  

Science.gov (United States)

We present a useful new diagram for characterizing the quasar-host-reddening mixture for AGN SEDs. This "mixing diagram" is based on a detailed study of 413 X-ray selected Type 1 AGN SEDs from the XMM-COSMOS Survey (Elvis, Hao, et al., 2011). The mixing diagram plots the near-IR (1-3micron) spectral slope against the optical (0.3-1micron) slope to form a generalized 'color-color' diagram. A pure AGN continuum (Elvis et al., 1994, E94) and pure host galaxies are located at clear and distinct positions on the mixing diagram. The lines joining them indicate the fraction of host contribution to each AGN. The reddening vector is almost perpendicular to these mixing lines, and so is easily measured independently. The mixing diagram shows that 90% of the AGNs lie on mixing curves between the mean E94 AGN SED and a host galaxy, with only modest reddening [E(B-V)=0.1-0.2] (Hao et al., 2011a). Lower luminosity and lower Eddington ratio AGNs have a larger host galaxy fraction, as expected. Optically selected samples (SDSS) have smaller host galaxy fractions. There is some intrinsic scatter around the E94 mean SED. A substantial minority, 10%, of the XMM-COSMOS AGNs are inconsistent with any AGN+host+reddening mix. These AGNs have weak or non-existent near-IR bumps, suggesting a lack of the hot dust characteristic of AGNs (Hao et al., 2010). A similar fraction of these "hot dust poor" (HDP) quasars are found in the Elvis et al. 1994 (BQS) and Richards et al. 2006 (SDSS) samples (Hao et al., 2011b). The fraction of "hot dust poor" AGNs grows to 20% at z>2 (Hao et al. 2010). The proposed 'cosmic cycle' of SMBH and galaxy co-evolution (e.g. Hopkins et al., 2006) can be shown as tracks on the mixing diagram. The mixing diagram definition could also be expanded to other wavelengths.

Hao, Heng; Elvis, M.; Civano, F.

2011-05-01

247

An evaluation of the source selection elements of the prototype UMLS Information Sources Map.  

Science.gov (United States)

The Information Sources Map (ISM) is a component of the National Library of Medicine's Unified Medical Language System (UMLS) project. The ISM is intended to provide both human-readable and machine-interpretable information about the content, scope, and access conditions for various information sources such as databases, expert systems, and the organizations which make these information sources available. Automated source selection is supported by three types of indexing in the ISM: Medical Subject Heading (MeSH) terms and subheadings; Semantic Types from the UMLS Semantic Network; and Semantic Type Relations, which depict pairs of semantic types joined by a relationship chosen from the Semantic Network. This paper reports a study of the recall and precision of the source selection elements in the prototype version of the ISM. PMID:1482883

Masys, D R

1992-01-01

248

UML-based Requirements Analysis on Risk Pre-control System in Coal Enterprise  

Directory of Open Access Journals (Sweden)

Full Text Available Combining with the present situation of risk management in domestic coal enterprises,the overall flow of risk pre-control system of coal enterprise is designed on the basis of the ISO/FDIS31000 “Risk management—Principles and guidelines” released by the International Standards Organization and risk precontrol management system of safety in coal mine, UML(unified modeling language is used as a tool to establish the model of system requirements analysis, risk management subsystem is taken as an example to elaborate the modeling process of system analysis, the merit of ensuring the accuracy and consistency of system analysis when using UML as the tool of object-oriented system requirements analysis is verified.  

Huang Hui

2013-07-01

249

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

2007-01-01

250

The potential of the digital anatomist foundational model for assuring consistency in UMLS sources.  

OpenAIRE

Inconsistent anatomical concept representation can be identified in anatomy textbooks and hard copy term lists, as well as in UMLS source vocabularies and other controlled medical terminologies. In this report we select some examples of inconsistent representations of anatomical concepts, and illustrate how these inconsistencies can be explained and reconciled by the Digital Anatomist Foundational Model. We use this process for gaining a measure of the validity of the logic-based Model.

Mejino, J. L.; Rosse, C.

1998-01-01

251

The potential of the digital anatomist foundational model for assuring consistency in UMLS sources.  

Science.gov (United States)

Inconsistent anatomical concept representation can be identified in anatomy textbooks and hard copy term lists, as well as in UMLS source vocabularies and other controlled medical terminologies. In this report we select some examples of inconsistent representations of anatomical concepts, and illustrate how these inconsistencies can be explained and reconciled by the Digital Anatomist Foundational Model. We use this process for gaining a measure of the validity of the logic-based Model. PMID:9929334

Mejino, J L; Rosse, C

1998-01-01

252

Modelling the real-time behaviour of machine controls using UML statecharts  

OpenAIRE

For covering the real-time characteristics of an automation system during model-based design it is essential to model not only the function but also the behaviour of the control programs running on a real-time controller. This paper introduces an approach to the modelling and evaluation of the functional and time behaviour of Programmable Logic Controllers (PLC) on model level. The control algorithm consisting of UML statecharts is extended with an execution model of the controller which is a...

Seidel, S.; Klotz, T.; Donath, U.; Haufe, J.

2010-01-01

253

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

Science.gov (United States)

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. PMID:14664031

Kumar, Anand; Ciccarese, Paolo; Quaglini, Silvana; Stefanelli, Mario; Caffi, Ezio; Boiocchi, Lorenzo

2003-01-01

254

Recovery function of Components of Additive Model of Biometric System Reliability in UML  

OpenAIRE

Approaches The development of biometric systems is undoubtedly on the rise in the number and the application areas. Modelling of system reliability and system data analysis after failure and the time of re-establishing the operating regime is of crucial importance for users of the system and also for producers of certain components. This paper gives an overview of the mathematical model of biometric system function recovery and its application through the UML model.

Zoran ?osi?; Jasmin ?osi?; Miroslav Ba?a

2011-01-01

255

Complete transformations of object models to relational database schemas in UML CASE tools  

OpenAIRE

The goal of the current work – creation of complete transformation algorithms from object models to relational databases and their implementation in UML CASE tools. OOP has enabled the creation of tools for object oriented software and databases. One of the main aims of such tools is to create the object model of software and also a database for storing information about these objects. Most tools of software engineering enable the creation of object oriented software model and its transform...

Maslauskas, Raimondas

2007-01-01

256

Comparing two ways of applying use case models in object-oriented design with UML  

OpenAIRE

In software engineering most proposed technology have not been subject to a thorough investigation. Knowledge of the effects, strenghts, and weaknesses of technology is essential to ensure a successful transfer to industry and identify areas of improvement. For example, the Unified Modeling Language (UML) is becoming the de-facto standard for object-oriented software analysis and design. Constructing analysis- and design models of a software system is beneficial to gain a higher-level underst...

Syversen, Erik

2002-01-01

257

System-level design automation using actor-orientation and UML  

OpenAIRE

Modeling at high levels of abstraction is often a need for early trade-off analysis within the Systems-on-Chip design flow. This master thesis overviews two the most promising approaches for system-level specification – Unified Modeling Language (UML) and actor oriented modeling. Also here is presented some possibilities of joint usage of those two approaches. Behavioral patterns are useful abstractions to simplify the design of the communication-centric systems. Such patterns are tradition...

Ramanauskas, Linas

2008-01-01

258

Modeling with logical time in UML for real-time embedded system design  

OpenAIRE

Design of real-time embedded systems requires particular attention to the careful scheduling of application onto execution platform. Precise cycle allocation is often requested to obtain full communication and computation throughput. Our objective is to provide a UML profile where events, actions, and objects can be annotated by ``logical'' clocks. Initially, clocks are not necessarily related. The goal of the scheduling process (and algorithms) is to regulate the data and control flows withi...

Andre?, Charles; Cuccuru, Arnaud; Simone, Robert; Talpin, Jean-pierre

2006-01-01

259

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

OpenAIRE

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 globulin A deficiency and all patients on a gluten-free diet were excluded from the study. Anti-endomysium antibodies (EMA) were detected by means of immunofluorescence using sections of distal monkey ...

Amani Mubarak; Wolters, Victorien M.; Hj, Frits Gmelig-meyling; Jw, Fiebo Ten Kate; Hj, Roderick Houwen

2012-01-01

260

UML-based Requirements Analysis on Risk Pre-control System in Coal Enterprise  

OpenAIRE

Combining with the present situation of risk management in domestic coal enterprises,the overall flow of risk pre-control system of coal enterprise is designed on the basis of the ISO/FDIS31000 “Risk management—Principles and guidelines” released by the International Standards Organization and risk precontrol management system of safety in coal mine, UML(unified modeling language) is used as a tool to establish the model of system requirements analysis, risk management subsystem is take...

Huang Hui; Yin Dongyue

2013-01-01

261

Developing a UMLS-based Indexing Tool for Health Science Repository System  

OpenAIRE

One of the important procedures during the operation of an Institutional Repository System (IRS) is to categorize and index the submitted digital objects. Based on current practice, human catalogers are frequently involved in this process to make accurate categorization. Funded by NLM development grant, we are developing an UMLS-based indexing tool. The tool will be integrated or plug-in into most IRS, and categorize and assign MeSH headings and keywords to text-based digital objects automati...

Zhang, Dongming; Roderer, Nancy K.; Huang, Guang; Zhao, Xin

2006-01-01

262

A Preliminary Correctness Evaluation Model of Object-Oriented Software Based on UML  

Directory of Open Access Journals (Sweden)

Full Text Available Concurrent engineering is a philosophy that attempts to take into account of all the activities of a product life cycle early in the design stage. In the manufacturing industry, approximately 70% of a product`s manufacting and assembly costs are determined during the design stage. Similar to the software industry system analysis and design has significant influence on later activities of the software development life cycle. Object-oriented approach has been the main stream for software development, and unified Modeling Language (UML integrates most of the object-oriented modeling methods and has become the standards. This paper incorporates the CE concept into the evaluation of object-oriented software development and proposes a Hierarchical Aggregation Model (HAM to early evaluate the object-oriented software design quality based on UML. There are three advantages of using this model. First, this model can help reduce the project risk, cost, and time span, and eventually improve the software quality early in the software development life cycle. Secondly, this model facilitates the use of the standards of object-oriented modeling language, UML, which makes proposed model more applicable to real software development. Thirdly, this model is easy to implement, that can potentially be imbedded in CASE tools to directly support the project manager`s decision making.

S. Wesley Changchien

2002-01-01

263

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

2011-07-01

264

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

2011-07-01

265

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

266

The diagram for phyllotactic series  

OpenAIRE

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

267

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

1997-06-01

268

Algorithmic approach to diagram techniques  

International Nuclear Information System (INIS)

An algorithmic approach to diagram techniques of elementary particles is proposed. The definition and axiomatics of the theory of algorithms are presented, followed by the list of instructions of an algorithm formalizing the construction of graphs and the assignment of mathematical objects to them. (T.A.)

269

Multi-currency Influence Diagrams  

DEFF Research Database (Denmark)

When using the influence diagrams framework for solving a decision problem with several different quantitative utilities, the traditional approach has been to convert the utilities into one common currency. This conversion is carried out using a tacit transformation, under the assumption that the converted problem is equivalent to the original one. In this paper we present an extension of the influence diagram framework. The extension allows for these decision problems to be modelled in their original form. We present an algorithm that, given a linear conversion function between the currencies of the original utilities, discovers a characterisation of all other such functions, which induce the same optimal strategy. As this characterisation can potentially be very complex, we give methods to present it in an approximate way.

Nielsen, SØren Holbech; Nielsen, Thomas Dyhre

2007-01-01

270

The Butterfly Diagram Internal Structure  

International Nuclear Information System (INIS)

A time-latitude diagram, where the spotgroup area is taken into account, is presented for cycles 12 through 23. The results show that the spotted area is concentrated in few, small portions (knots) of the Butterfly Diagram (BD). The BD may be described as a cluster of knots. Knots are distributed in the butterfly wings in a seemingly randomly way. A knot may appear at either lower or higher latitudes than previous ones, in spite of the prevalent tendency to appear at lower and lower latitudes. Accordingly, the spotted area centroid, far from continuously drifting equatorward, drifts poleward or remains stationary in any hemisphere for significant fractions (? 1/3) of the cycle total duration. In a relevant number of semicycles, knots seem to form two roughly parallel, oblique chains, separated by an underspotted band. This picture suggests that two (or more) ''activity streams'' approach the equator at a rate higher than the spot zone as a whole.

271

Multi-objective Influence Diagrams  

OpenAIRE

We describe multi-objective influence diagrams, based on a set of p objectives, where utility values are vectors in Rp, and are typically only partially ordered. These can still be solved by a variable elimination algorithm, leading to a set of maximal values of expected utility. If the Pareto ordering is used this set can often be prohibitively large. We consider approximate representations of the Pareto set based on e-coverings, allowing much larger problems to be solved. ...

Marinescu, Radu; Razak, Abdul; Wilson, Nic

2012-01-01

272

Minimal Area Nonorientable String Diagrams  

OpenAIRE

We use minimal area metrics to generate all nonorientable string diagrams. The surfaces in unoriented string theory have nontrivial open curves and nontrivial closed curves whose neighborhoods are either annuli or Mobius strips. We define a minimal area problem by imposing length conditions on open curves and on annular closed curves only. We verify that the minimal area conditions are respected by the sewing operations. The natural objects that satisfy recursion relations i...

Dewolfe, Oliver

1997-01-01

273

Grid diagrams and Khovanov homology  

OpenAIRE

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 symplectic link invariant coincides with the difference between the homological grading on Khovanov homology and the Jones grading on Khovanov homology. We give some evidence for th...

Droz, J-m; Wagner, E.

2009-01-01

274

Tiling groupoids and Bratteli diagrams  

CERN Document Server

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

275

Two-state shear diagrams for complex fluids in shear flow  

OpenAIRE

The possible ``phase diagrams'' for shear-induced phase transitions between two phases are collected. We consider shear-thickening and shear-thinning fluids, under conditions of both common strain rate and common stress in the two phases, and present the four fundamental shear stress vs. strain-rate curves and discuss their concentration dependence. We outline how to construct more complicated phase diagrams, discuss in which class various experimental systems fall, and sket...

Olmsted, Peter D.

1999-01-01

276

Vogan diagrams of Basic Lie Superalgebras  

CERN Document Server

This article classifies the real forms of Lie Superalgebra by Vogan diagrams. A Vogan diagram is a Dynkin diagram of triplet $(\\mathfrak{g_{C},\\mathfrak{h}_{\\bar{0},\\triangle^{+})}$ where $\\mathfrak{g_{0}}$ is a real Lie superalgebra, $\\mathfrak{h}_{\\bar{0}$ cartan subalgebra, $\\triangle^{+}$ positive root system.

Ransingh, B

2012-01-01

277

Arrows in Comprehending and Producing Mechanical Diagrams  

Science.gov (United States)

Mechanical systems have structural organizations--parts, and their relations--and functional organizations--temporal, dynamic, and causal processes--which can be explained using text or diagrams. Two experiments illustrate the role of arrows in diagrams of mechanical systems. In Experiment 1, people described diagrams with or without arrows,…

Heiser, Julie; Tversky, Barbara

2006-01-01

278

Birthing Classes  

Science.gov (United States)

... hospital or birthing center should also have a list of classes. Look for childbirth classes offered by: hospitals private teachers health care providers (through their practices) community health organizations midwives national childbirth education organizations videos and DVDs You can ...

279

Psi-floor diagrams and a Caporaso-Harris type recursion  

CERN Document Server

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

280

Dependent Classes  

DEFF Research Database (Denmark)

Virtual classes allow nested classes to be refined in subclasses. In this way nested classes can be seen as dependent abstractions of the objects of the enclosing classes. Expressing dependency via nesting, however, has two limitations: Abstractions that depend on more than one object cannot be modeled and a class must know all classes that depend on its objects. This paper presents dependent classes, a generalization of virtual classes that expresses similar semantics by parameterization rather than by nesting. This increases expressivity of class variations as well as the flexibility of their modularization. Besides, dependent classes complement multi-methods in scenarios where multi-dispatched abstractions rather than multi-dispatched method are needed. They can also be used to express more precise signatures of multi-methods and even extend their dispatch semantics. We present a formal semantics of dependent classes and a machine-checked type soundness proof in Isabelle/HOL [29], the first of this kind for a language with virtual classes and path-dependent types. [29] T.Nipkow, L.C. Poulson, and M. Wenzel. Isabelle/HOL -- A Proof Assistant for Higher-Order Logic, volume 2283 of LNCS, Springer, 2002

Gasiunas, Vaidas; Mezini, Mira

2007-01-01

281

A proposal for incorporating health level seven (HL7) vocabulary in the UMLS Metathesaurus.  

OpenAIRE

The HL7 Vocabulary Technical Committee (TC) was organized to select and maintain the vocabulary used in HL7 messages. The goal is to make implementations of the Version 3 HL7 Standard more plug-and-play compatible. In order to make the vocabulary readily accessible to the public, HL7 is collaborating with the U.S. National Library of Medicine (NLM) to include HL7 vocabulary in the Unified Medical Language System (UMLS) Metathesaurus. This article describes a proposal for how HL7 data elements...

Huff, S. M.; Bidgood, W. D.; Cimino, J. J.; Hammond, W. E.

1998-01-01

282

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.

Liu Fang

2007-02-01

283

A Trajectory UML Profile for Modeling Trajectory Data: A Mobile Hospital Use Case  

Directory of Open Access Journals (Sweden)

Full Text Available A large amount of trajectory data resulting from moving objects can be collected thanks to localization based services and monitoring systems. Those trajectory data can be used for analysis purposes in many domains (medicine, commerce, environment…. For this reason, modeling trajectory data at the conceptual level is an important stair. In this paper, we propose a new profile based on UML in order to enhance the conceptual modeling of trajectory data related to mobile hospitals by new stereotypes and new icons.

Wided Oueslati

2011-02-01

284

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

285

Structuration and acquisition of medical knowledge. Using UMLS in the conceptual graph formalism.  

OpenAIRE

The use of a taxonomy, such as the concept type lattice (CTL) of Conceptual Graphs, is a central structuring piece in a knowledge-based system. The knowledge it contains is constantly used by the system, and its structure provides a guide for the acquisition of other pieces of knowledge. We show how UMLS can be used as a knowledge resource to build a CTL and how the CTL can help the process of acquisition for other kinds of knowledge. We illustrate this method in the context of the MENELAS na...

Volot, F.; Zweigenbaum, P.; Bachimont, B.; Ben Said, M.; Bouaud, J.; Fieschi, M.; Boisvieux, J. F.

1993-01-01

286

Structuration and acquisition of medical knowledge. Using UMLS in the conceptual graph formalism.  

Science.gov (United States)

The use of a taxonomy, such as the concept type lattice (CTL) of Conceptual Graphs, is a central structuring piece in a knowledge-based system. The knowledge it contains is constantly used by the system, and its structure provides a guide for the acquisition of other pieces of knowledge. We show how UMLS can be used as a knowledge resource to build a CTL and how the CTL can help the process of acquisition for other kinds of knowledge. We illustrate this method in the context of the MENELAS natural language understanding project. PMID:8130568

Volot, F; Zweigenbaum, P; Bachimont, B; Ben Said, M; Bouaud, J; Fieschi, M; Boisvieux, J F

1993-01-01

287

Modeling of Immediate vs. Delayed Data Communications: from AADL to UML MARTE  

OpenAIRE

The forthcoming OMG UML Pro?le for Modeling and Analysis of Real-Time Embedded systems (MARTE) aims, amongst other things, at providing a referential Time Model subpro?le where semantic issues can be explicitly and formally described. As a full-size exercise we deal here with the modeling of immediate and delayed data communications in AADL. It actually re?ects an important issue in RT/E model semantics: a propagation of immediate communications may result in a combinatorial loop, with ...

Andre?, Charles; Mallet, Fre?de?ric; Simone, Robert

2007-01-01

288

Developing a UMLS-based indexing tool for health science repository system.  

Science.gov (United States)

One of the important procedures during the operation of an Institutional Repository System (IRS) is to categorize and index the submitted digital objects. Based on current practice, human catalogers are frequently involved in this process to make accurate categorization. Funded by NLM development grant, we are developing an UMLS-based indexing tool. The tool will be integrated or plug-in into most IRS, and categorize and assign MeSH headings and keywords to text-based digital objects automatically. PMID:17238776

Zhang, Dongming; Roderer, Nancy K; Huang, Guang; Zhao, Xin

2006-01-01

289

Software Verification and Validation with UML in Safety Related System of Nuclear Power Plant  

International Nuclear Information System (INIS)

Digital I and C system with computer is being used widely in Nuclear Power Plant(NPP) because of the development of digital and IT technologies. Also, windows OS and object oriented application are adopted in the reason of user-friend characteristic and easy development environment. Various software development techniques in object oriented environment are introduced but software V and V technique for NPP Safety Related System in object oriented environment was not seriously considered. So the software V and V methodology for the development of object oriented NPP application, especially with UML, has been developed

290

Liftings of diagrams of semilattices by diagrams of dimension groups  

CERN Document Server

We investigate categorical and amalgamation properties of the functor Idc assigning to every partially ordered abelian group G its semilattice of compact ideals Idc G. Our main result is the following. Theorem 1. Every diagram of finite Boolean semilattices indexed by a finite dismantlable partially ordered set can be lifted, with respect to the Idc functor, by a diagram of pseudo-simplicial vector spaces. Pseudo-simplicial vector spaces are a special kind of finite-dimensional partially ordered vector spaces (over the rationals) with interpolation. The methods introduced make it also possible to prove the following ring-theoretical result. Theorem 2. For any countable distributive join-semilattices S and T and any field K, any (v,0)-homomorphism $f: S\\to T$ can be lifted, with respect to the Idc functor on rings, by a homomorphism $f: A\\to B$ of K-algebras, for countably dimensional locally matricial algebras A and B over K. We also state a lattice-theoretical analogue of Theorem 2 (with respect to the Conc ...

Tuma, J; Tuma, Jiri; Wehrung, Friedrich

2005-01-01

291

Transformations of triangle ladder diagrams  

OpenAIRE

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. In paper arXiv:0803.3420 [hep-th] the half-diamonds were related by conformal integral substitution to the diamonds which represent the dual space image of four-point ladder integrals in the four-dimensional momentum space. Acting in the way described in the present paper we do not need t...

Kondrashuk, Igor; Vergara, Alvaro

2009-01-01

292

Higher-Order Gravitational Lensing Reconstruction using Feynman Diagrams  

CERN Document Server

We develop a method for calculating the correlation structure of the Cosmic Microwave Background (CMB) using Feynman diagrams, when the CMB has been modified by gravitational lensing, Faraday rotation, patchy reionization, or other distorting effects. This method is used to calculate the bias of the Hu-Okamoto quadratic estimator in reconstructing the lensing power spectrum up to O(\\phi^4) in the lensing potential $\\phi$. We consider both the diagonal noise TTTT, EBEB, etc. and, for the first time, the off-diagonal noise TTTE, TBEB, etc. The previously noted large O(\\phi^4) term in the second order noise is identified to come from a particular class of diagrams. It can be significantly reduced by a reorganization of the $\\phi$ expansion. These improved estimators have almost no bias for the off-diagonal case involving only one $B$ component of the CMB, such as EEEB.

Jenkins, Elizabeth E; Waalewijn, Wouter J; Yadav, Amit P S

2014-01-01

293

A new kind of HR diagram  

International Nuclear Information System (INIS)

When the system of correlations between stellar parameters that we know as the HR diagram was discovered, the physical basis for them was unknown and remained essentially unknown during four decades of eager application. The author (1974) found a relationship which is hoped may have a similar history. A parameter related to the visual surface brightness of stars is expressible as Fsub(v) = log Tsub(eff) + 0.1C = 4.2207 - 0.1V0 - 0.5 log phi' where Tsub(eff) = effective temperature, C = Msub(bol) - V0 = bolometric correction, V0 = apparent visual magnitude corrected for extinction, and phi' = angular diameter of the star in arc milliseconds. It is found that Fsub(v) was extremely closely related to the Johnson (V-R)0, (and not to any other color index), that it is almost completely immune to the effects of interstellar extinction, and independent of luminosity class. The relation started from a consideration of occulation angular diameters but went on to include all determinations. (Auth.)

294

Community detection by graph Voronoi diagrams  

Science.gov (United States)

Accurate and efficient community detection in networks is a key challenge for complex network theory and its applications. The problem is analogous to cluster analysis in data mining, a field rich in metric space-based methods. Common to these methods is a geometric, distance-based definition of clusters or communities. Here we propose a new geometric approach to graph community detection based on graph Voronoi diagrams. Our method serves as proof of principle that the definition of appropriate distance metrics on graphs can bring a rich set of metric space-based clustering methods to network science. We employ a simple edge metric that reflects the intra- or inter-community character of edges, and a graph density-based rule to identify seed nodes of Voronoi cells. Our algorithm outperforms most network community detection methods applicable to large networks on benchmark as well as real-world networks. In addition to offering a computationally efficient alternative for community detection, our method opens new avenues for adapting a wide range of data mining algorithms to complex networks from the class of centroid- and density-based clustering methods.

Deritei, Dávid; Lázár, Zsolt I.; Papp, István; Járai-Szabó, Ferenc; Sumi, Róbert; Varga, Levente; Ravasz Regan, Erzsébet; Ercsey-Ravasz, Mária

2014-06-01

295

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)

296

Phase Diagrams for Sonoluminescing Bubbles  

CERN Document Server

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

297

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

2011-01-01

298

The architecture of the CMS Level-1 Trigger Control and Monitoring System using UML  

International Nuclear Information System (INIS)

The architecture of the Compact Muon Solenoid (CMS) Level-1 Trigger Control and Monitoring software system is presented. This system has been installed and commissioned on the trigger online computers and is currently used for data taking. It has been designed to handle the trigger configuration and monitoring during data taking as well as all communications with the main run control of CMS. Furthermore its design has foreseen the provision of the software infrastructure for detailed testing of the trigger system during beam down time. This is a medium-size distributed system that runs over 40 PCs and 200 processes that control about 4000 electronic boards. The architecture of this system is described using the industry-standard Universal Modeling Language (UML). This way the relationships between the different subcomponents of the system become clear and all software upgrades and modifications are simplified. The described architecture has allowed for frequent upgrades that were necessary during the commissioning phase of CMS when the trigger system evolved constantly. As a secondary objective, the paper provides a UML usage example and tries to encourage the standardization of the software documentation of large projects across the LHC and High Energy Physics community.

299

The architecture of the CMS Level-1 Trigger Control and Monitoring System using UML  

Science.gov (United States)

The architecture of the Compact Muon Solenoid (CMS) Level-1 Trigger Control and Monitoring software system is presented. This system has been installed and commissioned on the trigger online computers and is currently used for data taking. It has been designed to handle the trigger configuration and monitoring during data taking as well as all communications with the main run control of CMS. Furthermore its design has foreseen the provision of the software infrastructure for detailed testing of the trigger system during beam down time. This is a medium-size distributed system that runs over 40 PCs and 200 processes that control about 4000 electronic boards. The architecture of this system is described using the industry-standard Universal Modeling Language (UML). This way the relationships between the different subcomponents of the system become clear and all software upgrades and modifications are simplified. The described architecture has allowed for frequent upgrades that were necessary during the commissioning phase of CMS when the trigger system evolved constantly. As a secondary objective, the paper provides a UML usage example and tries to encourage the standardization of the software documentation of large projects across the LHC and High Energy Physics community.

Magrans de Abril, Marc; Da Rocha Melo, Jose L.; Ghabrous Larrea, Carlos; Hammer, Josef; Hartl, Christian; Lazaridis, Christos

2011-12-01

300

Converting UML Description of Software Architecture to Stochastic Process Algebra and Performance Evaluation  

Directory of Open Access Journals (Sweden)

Full Text Available Important qualitative parameters of the large softwaresystems are determined by indicators of effectiveness of thesoftware's, such as response time, operating power and error rate.Procedure modeling is an approach for evaluating the effectivenessand validation of the systems and, as well as it predicts therequirements of qualitative and quantitative performance andprovides a comparison between all kinds of designs with respect toperformance indicators.Present study suggested a method for converting the UMLdescription designing software to Stochastic Process Algebra(SPAmodel, which provides the application of using the UML indesigning software with high performance; in other words itputting the performance in designing software and a high qualitysoftware is designed.In order tomodeling the parts of system weuse state chart and for the interactions between the parts we use theCollaboration chart with the performance profile (using theperformance profile is the distinction between the suggestedapproach and the former ones.. An algorithm is provided forautomatic production of the SPA performance model from theXML(Extensible Markup Language documents and state andcollaboration charts with performance profiles(stereotype, labeland limitation, using the ExportXMI software, Argo UML isprovided, and then they gained SPA performance/operation modelin the PEPAworkbench tool is loaded for performance analysis,so as the designer can test thefulfill of performance goals of hisdesign according to type of different performance parameters andchanging in value and chooses the best option in designing.

Rahmat Zolfaghari

2013-07-01

301

The spectroscopic Hertzsprung-Russell diagram  

Science.gov (United States)

Context. The Hertzsprung-Russell diagram is an essential diagnostic diagram for stellar structure and evolution, which has now been in use for more than 100 years. Aims: We introduce a new diagram based on the gravity-effective temperature diagram, which has various advantages. Methods: Our spectroscopic Hertzsprung-Russell (sHR) diagram shows the inverse of the flux-mean gravity versus the effective temperature. Observed stars whose spectra have been quantitatively analyzed can be entered in this diagram without the knowledge of the stellar distance or absolute brightness. Results: Observed stars can be as conveniently compared to stellar evolution calculations in the sHR diagram as in the Hertzsprung-Russell diagram. However, at the same time, our ordinate is proportional to the stellar mass-to-luminosity ratio, which can thus be directly determined. For intermediate- and low-mass star evolution at constant mass, we show that the shape of an evolutionary track in the sHR diagram is identical to that in the Hertzsprung-Russell diagram. We also demonstrate that for hot stars, their stellar Eddington factor can be directly read off the sHR diagram. For stars near their Eddington limit, we argue that a version of the sHR diagram may be useful where the gravity is exchanged by the effective gravity. Conclusions: We discuss the advantages and limitations of the sHR diagram, and show that it can be fruitfully applied to Galactic stars, but also to stars with known distance, e.g., in the LMC or in galaxies beyond the Local Group.

Langer, N.; Kudritzki, R. P.

2014-04-01

302

Finite calculation of divergent selfenergy diagrams  

OpenAIRE

Using dispersive techniques, it is possible to avoid ultraviolet divergences in the calculation of Feynman diagrams, making subsequent regularization of divergent diagrams unnecessary. We give a simple introduction to the most important features of such dispersive techniques in the framework of the so-called finite causal perturbation theory. The method is also applied to the 'divergent' general massive two-loop sunrise selfenergy diagram, where it leads directly to an analy...

Aste, Andreas; Trautmann, Dirk

2003-01-01

303

Phase diagram of ammonium nitrate  

Science.gov (United States)

Ammonium Nitrate (AN) has often subjected to uses in improvised explosive devices, due to its wide availability as a fertilizer and its capability of becoming explosive with slight additions of organic and inorganic compounds. Yet, the origin of enhanced energetic properties of impure AN (or AN mixtures) is neither chemically unique nor well understood -resulting in rather catastrophic disasters in the past1 and thereby a significant burden on safety in using ammonium nitrates even today. To remedy this situation, we have carried out an extensive study to investigate the phase stability of AN at high pressure and temperature, using diamond anvil cells and micro-Raman spectroscopy. The present results confirm the recently proposed phase IV-to-IV' transition above 17 GPa2 and provide new constraints for the melting and phase diagram of AN to 40 GPa and 400 °C.

Dunuwille, M.; Yoo, C. S.

2014-05-01

304

Feynman diagrams for dispersion interactions  

Energy Technology Data Exchange (ETDEWEB)

Diagrammatic techniques have been used for a long time in perturbative calculations of dispersion interactions between atoms or molecules such as the Casimir-Polder or van-der-Waals interaction and atomic (or molecular) QED, as in the Lamb shift and the calculation of radiative lifetimes. Using the multipolar coupling scheme and Feynman-ordered diagrams rather than retarded graphs, significantly reduces the number of graphs required for calculating the T-matrix. The formalism presented earlier (2010) offers a rich toolbox that can be applied to different situations reaching from few-body interactions to Bose-Einstein condensates. It is possible to include macroscopic bodies and atomic wave packets, relevant for quantum gases in modern microtraps. Interesting applications involve entangled states or systems out of thermal equilibrium. Resonant contributions arise from the interaction of excited molecules and are supposed to play an important role in molecular biology.

Haakh, Harald; Schiefele, Juergen; Henkel, Carsten [Institut fuer Physik und Astronomie, Universitaet Potsdam (Germany)

2011-07-01

305

Phase diagram of ammonium nitrate  

International Nuclear Information System (INIS)

Ammonium Nitrate (AN) is a fertilizer, yet becomes an explosive upon a small addition of chemical impurities. The origin of enhanced chemical sensitivity in impure AN (or AN mixtures) is not well understood, posing significant safety issues in using AN even today. To remedy the situation, we have carried out an extensive study to investigate the phase stability of AN and its mixtures with hexane (ANFO–AN mixed with fuel oil) and Aluminum (Ammonal) at high pressures and temperatures, using diamond anvil cells (DAC) and micro-Raman spectroscopy. The results indicate that pure AN decomposes to N2, N2O, and H2O at the onset of the melt, whereas the mixtures, ANFO and Ammonal, decompose at substantially lower temperatures. The present results also confirm the recently proposed phase IV-IV? transition above 17 GPa and provide new constraints for the melting and phase diagram of AN to 40 GPa and 400°C

306

Calculations of forming limit diagrams  

Science.gov (United States)

The right-hand side of the forming limit diagram (FLD) was calculated using a Marciniak-Kuczynski analysis with a nonquadratic anisotropic yield criterion. Effects of changing the strain-hardening exponent, n, strain-rate exponent, m, strain ratio, R, stress exponent in the anisotropic yield criterion, a, and the inhomogeneity factor, f, were explored. For a ? 6, the effect of R is negligible. The calculated forming limit for plane strain is raised by increased values of n, m, and f and is unaffected by R and a. The slope of the right-hand side is decreased by increased values of n, m, and a, whereas the slope increases with higher f The calculated FLDs agree well with experimental ones determined by in-plane stretching.

Graf, Alejandro; Hosford, William F.

1990-01-01

307

Numerical Computation of Two-loop Box Diagrams with Masses  

CERN Document Server

A new approach is presented to evaluate multi-loop integrals, which appear in the calculation of cross-sections in high-energy physics. It relies on a fully numerical method and is applicable to a wide class of integrals with various mass configurations. As an example, the computation of two-loop planar and non-planar box diagrams is shown. The results are confirmed by comparisons with other techniques, including the reduction method, and by a consistency check using the dispersion relation.

Yuasa, F; Hamaguchi, N; Ishikawa, T; Kato, K; Kurihara, Y; Fujimoto, J; Shimizu, Y

2011-01-01

308

Phase diagrams for DNA crystallization systems.  

Science.gov (United States)

Phase diagrams for several oligonucleotide duplex-spermine systems have been constructed. These diagrams characterize the duplex and spermine concentrations ranges in which crystalline precipitates are formed. All of them are wedge-like form. The slope of the upper branch of the diagram is determined by the oligonucleotide length. The position of the lower branch depends on both the nucleotide sequence and its length. The position of the lower branch depends on both the nucleotide sequence and its length. It has been shown that the addition to the system of MgCl2 and NaCl salts and MPD results in specific changes in the diagrams. A model for oligonucleotide duplex-spermine system has been suggested which explains the main characteristic features of the obtained phase diagrams. The experimental phase diagrams for the (pGpT)n (pApC)n-spermine system (n = 2,3,4) have been analyzed ion terms of this model and the values of the binding constants of spermine and Mg2+ ions binding to duplexes have been determined. It permitted to identify the complexes that precipitated in different regions of the phase diagrams under various conditions. The diagram obtained in the presence of a cobalt hexammine counterion is also considered. It has been shown that this phase diagram, in general, is similar to those obtained for the oligonucleotide duplex-spermine system. PMID:3271481

Malinina, L V; Makhaldiani, V V; Tereshko, V A; Zarytova, V F; Ivanova, E M

1987-10-01

309

Some remarks about underused Loedel diagrams  

International Nuclear Information System (INIS)

We emphasize that it can be didactically very useful for students to realize how a space–time diagram of an observer, moving with a constant velocity with respect to another observer, can be obtained easily by means of a standard matrix of rotation, without recourse to imaginary axes and angles. These diagrams were introduced for the first time by Loedel and their main advantage over Minkowski diagrams is that a scale factor is not necessary to convert the units of an observer to those of another observer. We show this well-known property of Loedel diagrams using a new geometric approach. (paper)

310

Classical 3-loop 2-body diagrams  

OpenAIRE

As part of the study of the two-body problem in Einstein's gravity, the fourth post-Newtonian order (4PN) of the two-body effective action is being computed presently by both effective field theory (EFT) methods and others. Diagrams with 3 (or 4) classical loops appear to be a significant obstacle. In this paper we develop a method to compute such 3-loop diagrams and demonstrate it through a specific diagram. We reduce the classical diagrams through shrinking the body worldl...

Kol, Barak; Shir, Ruth

2013-01-01

311

Complexity Classes as Mathematical Axioms II  

OpenAIRE

The second author previously discussed how classical complexity separation conjectures, we call them "axioms", have implications in three manifold topology: polynomial length stings of operations which preserve certain Jones polynomial evaluations cannot produce exponential simplifications of link diagrams. In this paper, we continue this theme, exploring now more subtle separation axioms for quantum complexity classes. Surprisingly, we now find that similar strings are unab...

Cui, Shawn X.; Freedman, Michael H.; Wang, Zhenghan

2013-01-01

312

Global phase diagram of two-dimensional Dirac fermions in random potentials  

Science.gov (United States)

Anderson localization is studied for two flavors of massless Dirac fermions in two-dimensional space perturbed by static disorder that is invariant under a chiral symmetry (chS) and a time-reversal symmetry (TRS) operation which, when squared, is equal either to plus or minus the identity. The former TRS (symmetry class BDI) can, for example, be realized when the Dirac fermions emerge from spinless fermions hopping on a two-dimensional lattice with a linear energy dispersion such as the honeycomb lattice (graphene) or the square lattice with ? flux per plaquette. The latter TRS is realized by the surface states of three-dimensional Z2-topological band insulators in symmetry class CII. In the phase diagram parametrized by the disorder strengths, there is an infrared stable line of critical points for both symmetry classes BDI and CII. Here we discuss a “global phase diagram” in which disordered Dirac fermion systems in all three chiral symmetry classes, AIII, CII, and BDI, occur in four quadrants, sharing one corner which represents the clean Dirac fermion limit. This phase diagram also includes symmetry classes AII [e.g., appearing at the surface of a disordered three-dimensional Z2-topological band insulator in the spin-orbit (symplectic) symmetry class] and D (e.g., the random bond Ising model in two dimensions) as boundaries separating regions of the phase diagram belonging to the three chS classes AIII, BDI, and CII. Moreover, we argue that physics of Anderson localization in the CII phase can be presented in terms of a non-linear-? model (NL?M) with a Z2-topological term. We thereby complete the derivation of topological or Wess-Zumino-Novikov-Witten terms in the NL?M description of disordered fermionic models in all ten symmetry classes relevant to Anderson localization in two spatial dimensions.

Ryu, S.; Mudry, C.; Ludwig, A. W. W.; Furusaki, A.

2012-06-01

313

Mesh diagram analysis: developing a norm for Puerto Rican Americans.  

Science.gov (United States)

Cephalometric radiography is an important diagnostic aid in orthodontics. Mesh analysis is a proportionate cephalometric method of graphically assessing disharmonies of the craniofacial complex. Original norms for this analysis were created from a white, European American sample. Norms for black Americans of African descent were developed in another study. The purposes of this investigation were: (1) to develop a standard mesh diagram from a Puerto Rican American population; (2) to compare the diagram with previously established data from the white sample; (3) to develop linear and angular means for the Legan, Burstone, Ricketts, DiPaolo, and Steiner analyses for a Puerto Rican American population; and (4) to assess the use of a panel for selecting esthetically pleasing faces. The subjects in the study had no previous orthodontic treatment, had Class I occlusion with 6 mm or less of crowding per dental arch, and had two parents and two sets of grandparents who were were born in Puerto Rico. Sixty-nine patients met the study criteria, and 50 of those patients (20 males and 30 females) were selected as having esthetically pleasing faces by the panel. Male and female norm diagrams were created and these were compared with those developed previously. Linear and angular measurements were also compared. Significant differences between the ethnic groups were found in the dentoalveolar region. Similarities were noticed in the upper face height and anterior cranial base length. The panel selection results showed no agreement within the sexes, occupations, or ethnic groups. PMID:9347112

Evanko, A M; Freeman, K; Cisneros, G J

1997-01-01

314

On the problem of s-n diagram plotting using computer diagram recalculation  

International Nuclear Information System (INIS)

A procedure is developed which permits s-n diagrams to be obtained by the computer diagrams recalculation. The procedure is checked on specimens of M1 copper, TaB-10 tantalum alloy, VT1-0 titanium. It is shown that the diagrams plotted by the method of recalculation, are in sufficiently good agreement with those obtained under direct measuring of deformations

315

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

316

Derivation of UML Based Performance Models for Design Assessment in a Reuse Based Software Development Approach  

CERN Document Server

Reuse-based software development provides an opportunity for better quality and increased productivity in the software products. One of the most critical aspects of the quality of a software system is its performance. The systematic application of software performance engineering techniques throughout the development process can help to identify design alternatives that preserve desirable qualities such as extensibility and reusability while meeting performance objectives. In the present scenario, most of the performance failures are due to a lack of consideration of performance issues early in the development process, especially in the design phase. These performance failures results in damaged customer relations, lost productivity for users, cost overruns due to tuning or redesign, and missed market windows. In this paper, we propose UML based Performance Models for design assessment in a reuse based software development scenario.

Jasmine, K S

2009-01-01

317

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

Directory of Open Access Journals (Sweden)

Full Text Available 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 globulin A deficiency and all patients on a gluten-free diet were excluded from the study. Anti-endomysium antibodies (EMA were detected by means of immunofluorescence using sections of distal monkey esophagus (EUROIMMUN, Luebeck, Germany. Serum anti-tTGA were measured by means of enzyme-linked immunosorbent assay using human recombinant tissue transglutaminase (ELiA Celikey IgA kit Phadia AB, Uppsala, Sweden. The histological slides were graded by a single experienced pathologist using the Marsh classification as modified by Oberhuber. Marsh II and III lesions were considered to be diagnostic for the disease. The positive predictive values (PPVs, negative predictive values (NPVs, sensitivity and specificity of EMA and tTGA along with their 95% CI (for the cut off values > 10 and ? 100 U/mL were calculated using histology as the gold standard for CD. RESULTS: A total of 183 children were included in the study. A total of 70 (38.3% were male, while 113 (61.7% were female. The age range was between 1.0 and 17.6 years, and the mean age was 6.2 years. One hundred twenty (65.6% patients had a small intestinal biopsy diagnostic for the disease; 3 patients had a Marsh II lesion, and 117 patients had a Marsh III lesion. Of the patients without CD, only 4 patients had a Marsh?I?lesion. Of the 183 patients, 136 patients were positive for EMA, of whom 20 did not have CD, yielding a PPV for EMA of 85% (95% CI: 78%-90% and a corresponding specificity of 68% (95% CI: 55%-79%. The NPV and specificity for EMA were 91% (95% CI: 79%-97% and 97% (95% CI: 91%-99%, respectively. Increased levels of tTGA were found in 130 patients, although only 116 patients truly had histological evidence of the disease. The PPV for tTGA was 89% (95% CI: 82%-94%, and the corresponding specificity was 78% (95% CI: 65%-87%. The NPV and sensitivity were 92% (95% CI: 81%-98% and 97% (95% CI: 91%-99%, respectively. A tTGA level ? 100 U/mL was found in 87 (47.5% patients, all of whom were also positive for EMA. In all these 87 patients, epithelial lesions confirming CD were found, giving a PPV of 100% (95%CI: 95%-100%. The corresponding specificity for this cut-off value was also 100% (95% CI: 93%-100%. Within this group, a total of 83 patients had symptoms, at least gastrointestinal and/or growth retardation. Three patients were asymptomatic but were screened because they belonged to a group at risk for CD (diabetes mellitus type 1 or positive family history. The fourth patient who lacked CD-symptoms was detected by coincidence during an endoscopy performed for gastro-intestinal bleeding. CONCLUSION: This study confirms based on prospective data that a small intestinal biopsy is not necessary for the diagnosis of CD in symptomatic patients with tTGA ? 100 U/mL.

Amani Mubarak

2012-01-01

318

A Conceptual and UML models of procurement process for simulation framework  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents a set of conceptual and UML models that can be used to construct a simulation framework of procurement process. Whereas the good control of this process is crucial as well it composes an interesting ratio of costs along the whole chain. For this purpose, we took into account the information and the material flows of the upstream supply chain that linking the manufacturer and its suppliers. Our contribution is to make a reusable and a modular pattern of procurement process, which is able to be configured and used for several manufacturer industries. In order to benchmark the different scenarios of each configuration and to furnish a decision aids tool, for the sake of the decision makers to obtain the right choices.

Abdessamad Douraid

2012-11-01

319

Mapping Images with the Coherence Length Diagrams  

OpenAIRE

Statistical pattern recognition methods based on the Coherence Length Diagram (CLD) have been proposed for medical image analyses, such as quantitative characterisation of human skin textures, and for polarized light microscopy of liquid crystal textures. Further investigations are made on image maps originated from such diagram and some examples related to irregularity of microstructures are shown.

Sparavigna, A.; Marazzato, R.

2008-01-01

320

Phase Diagrams for Traffics on the Crossroad  

Science.gov (United States)

The traffic flows on two one-lane roads, crossing at a point, are studied on the basis of the local occupation probability method. The phase diagrams are constructed for the cases of various maximum car velocities. It has turned out that the phase diagrams consist essentailly of five regions.

Ishibashi, Yoshihiro; Fukui, Minoru

2001-09-01

321

Hofstadter butterfly as Quantum phase diagram  

OpenAIRE

The Hofstadter butterfly is viewed as a quantum phase diagram with infinitely many phases, labelled by their (integer) Hall conductance, and a fractal structure. We describe various properties of this phase diagram: We establish Gibbs phase rules; count the number of components of each phase, and characterize the set of multiple phase coexistence.

Osadchy, D.; Avron, J.

2001-01-01

322

On the phase diagram of branched polymer collapse  

CERN Document Server

The phase diagram of the collapse of a two-dimensional infinite branched polymer interacting with the solvent and with itself through contact interactions is studied from the q\\to 1 limit of an extension of the q- states Potts model. Exact solution on the Bethe lattice and Migdal-Kadanoff renormalization group calculations show that there is a line of \\theta transitions from the extended to a single compact phase. The \\theta line, governed by three different fixed points, consists of two lines of extended--compact transitions which are in different universality classes and meet in a multicritical point. On the other hand, directed branched polymers are shown to be completely determined by the strongly embedded case and there is a single \\theta transition which is in the directed percolation universality class.

Henkel, M; Henkel, Malte; Seno, Flavio

1996-01-01

323

Reading fitness landscape diagrams through HSAB concepts  

Science.gov (United States)

Fitness landscapes are conceived as range of mountains, with local peaks and valleys. In terms of potential, such topographic variations indicate places of local instability or stability. The chemical potential, or electronegativity, its value changed of sign, carries similar information. In addition to chemical descriptors defined through hard-soft acid-base (HSAB) concepts and computed through density functional theory (DFT), the principles that rule chemical reactions allow the design of such landscape diagrams. The simplest diagram uses electrophilicity and hardness as coordinates. It allows examining the influence of maximum hardness or minimum electrophilicity principles. A third dimension is introduced within such a diagram by mapping the topography of electronegativity, polarizability or charge exchange. Introducing charge exchange during chemical reactions, or mapping a third parameter (f.i. polarizability) reinforces the information carried by a simple binary diagram. Examples of such diagrams are provided, using data from Earth Sciences, simple oxides or ligands.

Vigneresse, Jean-Louis

2014-10-01

324

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

325

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

326

Phase diagram of ammonium nitrate  

Energy Technology Data Exchange (ETDEWEB)

Ammonium Nitrate (AN) is a fertilizer, yet becomes an explosive upon a small addition of chemical impurities. The origin of enhanced chemical sensitivity in impure AN (or AN mixtures) is not well understood, posing significant safety issues in using AN even today. To remedy the situation, we have carried out an extensive study to investigate the phase stability of AN and its mixtures with hexane (ANFO–AN mixed with fuel oil) and Aluminum (Ammonal) at high pressures and temperatures, using diamond anvil cells (DAC) and micro-Raman spectroscopy. The results indicate that pure AN decomposes to N{sub 2}, N{sub 2}O, and H{sub 2}O at the onset of the melt, whereas the mixtures, ANFO and Ammonal, decompose at substantially lower temperatures. The present results also confirm the recently proposed phase IV-IV{sup ?} transition above 17 GPa and provide new constraints for the melting and phase diagram of AN to 40 GPa and 400°C.

Dunuwille, Mihindra; Yoo, Choong-Shik, E-mail: csyoo@wsu.edu [Department of Chemistry and Institute for Shock Physics, Washington State University, Pullman, Washington 99164 (United States)

2013-12-07

327

The Amplituhedron from Momentum Twistor Diagrams  

CERN Document Server

We propose a new diagrammatic formulation of the all-loop scattering amplitudes/Wilson loops in planar N=4 SYM, dubbed the "momentum-twistor diagrams". These are on-shell-diagrams obtained by gluing trivalent black and white vertices defined in momentum twistor space, which, in the reduced diagram case, are known to be related to diagrams in the original twistor space. The new diagrams are manifestly Yangian invariant, and they naturally represent factorization and forward-limit contributions in the all-loop BCFW recursion relations in momentum twistor space, in a fashion that is completely different from those in momentum space. We show how to construct and evaluate momentum-twistor diagrams, and how to use them to obtain tree-level amplitudes and loop-level integrands; in particular for the latter we identify an isolated bubble-structure for each loop variable, arising from a forward limit, or entangled removal of particles. From a given diagram one can directly read off the C, D matrices via a generalized ...

Bai, Yuntao

2014-01-01

328

Symmetry Classes  

CERN Document Server

Physical systems exhibiting stochastic or chaotic behavior are often amenable to treatment by random matrix models. In deciding on a good choice of model, random matrix physics is constrained and guided by symmetry considerations. The notion of 'symmetry class' (not to be confused with 'universality class') expresses the relevance of symmetries as an organizational principle. Dyson, in his 1962 paper referred to as the Threefold Way, gave the prime classification of random matrix ensembles based on a quantum mechanical setting with symmetries. In this article we review Dyson's Threefold Way from a modern perspective. We then describe a minimal extension of Dyson's setting to incorporate the physics of chiral Dirac fermions and disordered superconductors. In this minimally extended setting, where Hilbert space is replaced by Fock space equipped with the anti-unitary operation of particle-hole conjugation, symmetry classes are in one-to-one correspondence with the large families of Riemannian symmetric spaces.

Zirnbauer, Martin R

2010-01-01

329

Benchmarking the accuracy of reverse engineering tools for Java programs: a study of eleven UML tools. Technical Report: NUIM-CS-TR-2007-01  

OpenAIRE

Software Development is not always a “Green Field” process, and software developers often find themselves maintaining old code. UML CASE tools provide the ability to reverse engineer source code. Software developers may find themselves needing to reverse engineer some source code in order to understand its design. Since there are a number of UML CASE tools available, the question many organisations face is: Which one suits our needs best? To answer this question they will need...

Kearney, Steven; Power, James F.

2007-01-01

330

Algorithmic Identification for Wings in Butterfly Diagrams.  

Science.gov (United States)

We investigate to what extent the wings of solar butterfly diagrams can be separated without an explicit usage of Hale's polarity law as well as the location of the solar equator. Two algorithms of cluster analysis, namely DBSCAN and C-means, have demonstrated their ability to separate the wings of contemporary butterfly diagrams based on the sunspot group density in the diagram only. Here we generalize the method for continuous tracers, give results concerning the migration velocities and presented clusters for 12 - 20 cycles.

Illarionov, E. A.; Sokolov, D. D.

2012-12-01

331

Prolog Visualization System Using Logichart Diagrams  

CERN Document Server

We have developed a Prolog visualization system that is intended to support Prolog programming education. The system uses Logichart diagrams to visualize Prolog programs. The Logichart diagram is designed to visualize the Prolog execution flow intelligibly and to enable users to easily correlate the Prolog clauses with its parts. The system has the following functions. (1) It visually traces Prolog execution (goal calling, success, and failure) on the Logichart diagram. (2) Dynamic change in a Prolog program by calling extra-logical predicates, such as `assertz' and `retract', is visualized in real time. (3) Variable substitution processes are displayed in a text widget in real time.

Adachi, Yoshihiro

2009-01-01

332

Availability verification of information for human system interface in automatic SG level control using activity diagram  

Energy Technology Data Exchange (ETDEWEB)

Steam Generator (SG) level control system in OPR 1000 is one of representative automatic systems that falls under the Supervisory Control level in Endsley's taxonomy. Supervisory control of automated systems is classified as a form of out of the loop (OOTL) performance due to passive involvement in the systems operation, which could lead to loss of situation awareness (SA). There was a reported event, which was caused by inadequate human automation communication that contributed to an unexpected reactor trip in July 2005. A high SG level trip occurred in Yeonggwang (YGN) Unit 6 Nuclear Power Plant (NPP) due to human operator failure to recognize the need to change the control mode of the economizer valve controller (EVC) to manual mode during swap over (the transition from low power mode to high power mode) after the loss of offsite power (LOOP) event was recovered. This paper models the human system interaction in NPP SG level control system using Unified Modeling Language (UML) Activity Diagram. Then, it identifies the missing information for operators in the OPR1000 Main Control Room (MCR) and suggests some means of improving the human system interaction.

Nuraslinda, Anuar; Kim, Dong Young; Kim, Jong Hyun [KEPCO International Nuclear Graduate School, Uljugun (Korea, Republic of)

2012-10-15

333

Availability verification of information for human system interface in automatic SG level control using activity diagram  

International Nuclear Information System (INIS)

Steam Generator (SG) level control system in OPR 1000 is one of representative automatic systems that falls under the Supervisory Control level in Endsley's taxonomy. Supervisory control of automated systems is classified as a form of out of the loop (OOTL) performance due to passive involvement in the systems operation, which could lead to loss of situation awareness (SA). There was a reported event, which was caused by inadequate human automation communication that contributed to an unexpected reactor trip in July 2005. A high SG level trip occurred in Yeonggwang (YGN) Unit 6 Nuclear Power Plant (NPP) due to human operator failure to recognize the need to change the control mode of the economizer valve controller (EVC) to manual mode during swap over (the transition from low power mode to high power mode) after the loss of offsite power (LOOP) event was recovered. This paper models the human system interaction in NPP SG level control system using Unified Modeling Language (UML) Activity Diagram. Then, it identifies the missing information for operators in the OPR1000 Main Control Room (MCR) and suggests some means of improving the human system interaction

334

On divisorial filtrations associated with Newton diagrams  

OpenAIRE

We consider divisorial filtration on the rings of functions on hypersurface singularities associated with Newton diagrams and their analogues for plane curve singularities. We compute the multi-variable Poincar\\'e series for the latter ones.

Ebeling, Wolfgang; Gusein-zade, Sabir M.

2010-01-01

335

Grid Diagrams and Legendrian Lens Space Links  

CERN Document Server

Grid diagrams encode useful geometric information about knots in S^3. In particular, they can be used to combinatorially define the knot Floer homology of a knot K in S^3, and they have a straightforward connection to Legendrian representatives of K in (S^3, \\xi_\\st), where \\xi_\\st is the standard, tight contact structure. The definition of a grid diagram was extended to include a description for links in all lens spaces, resulting in a combinatorial description of the knot Floer homology of a knot K in L(p, q) for all p > 0. In the present article, we explore the connection between lens space grid diagrams and the contact topology of a lens space. Our hope is that an understanding of grid diagrams from this point of view will lead to new approaches to the Berge conjecture, which claims to classify all knots in S^3 upon which surgery yields a lens space.

Baker, Kenneth L

2008-01-01

336

Drawing conformal diagrams for a fractal landscape  

CERN Document Server

Generic models of cosmological inflation and the recently proposed scenarios of a recycling universe and the string theory landscape predict spacetimes whose global geometry is a stochastic, self-similar fractal. To visualize the complicated causal structure of such a universe, one usually draws a conformal (Carter-Penrose) diagram. I develop a new method for drawing conformal diagrams, applicable to arbitrary 1+1-dimensional spacetimes. This method is based on a qualitative analysis of intersecting lightrays and thus avoids the need for explicit transformations of the spacetime metric. To demonstrate the power and simplicity of this method, I present derivations of diagrams for spacetimes of varying complication. I then apply the lightray method to three different models of an eternally inflating universe (scalar-field inflation, recycling universe, and string theory landscape) involving the nucleation of nested asymptotically flat, de Sitter and/or anti-de Sitter bubbles. I show that the resulting diagrams ...

Winitzki, S

2005-01-01

337

An Introduction to Binary Decision Diagrams  

DEFF Research Database (Denmark)

This note is a short introduction to Binary Decision Diagrams (BDDs). It provides some background knowledge and describes the core algorithms. It is used in the course "C4340 Advanced Algorithms" at the Technical University of Denmark, autumn 1996.

Andersen, Henrik Reif

1996-01-01

338

Voronoi diagram generation on the ellipsoidal earth  

Science.gov (United States)

Voronoi diagram on the earth surface is a powerful tool to study spatial proximity at continental or global scale. However, its computation remains challenging because geospatial features have complex shapes. This paper presents a raster-based algorithm to generate Voronoi diagrams on earth's surface. The algorithm approximates the exact point-to-point geographical distances using the cell-to-cell geographical distances calculated by a geographical distance transform. The result is a distance image on which Voronoi diagram is delineated. Compared to existing methods, the proposed algorithm calculates geographical distances based on an earth ellipsoid and allows Voronoi generators to take complex shapes. Most importantly, its approximation error is bounded thus enabling users to control the accuracy of the Voronoi diagram through grid resolution.

Hu, Hai; Liu, XiaoHang; Hu, Peng

2014-12-01

339

Value of Evidence on Influence Diagrams  

OpenAIRE

In this paper, we introduce evidence propagation operations on influence diagrams and a concept of value of evidence, which measures the value of experimentation. Evidence propagation operations are critical for the computation of the value of evidence, general update and inference operations in normative expert systems which are based on the influence diagram (generalized Bayesian network) paradigm. The value of evidence allows us to compute directly an outcome sensitivity,...

Ezawa, Kazuo J.

2013-01-01

340

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

341

Enumeration of many-body skeleton diagrams  

CERN Document Server

The many-body dynamics of interacting electrons in condensed matter and quantum chemistry is often studied at the quasiparticle level, where the perturbative diagrammatic series is partially resummed. Based on Hedin's equations for self-energy, polarization, propagator, effective potential, and vertex function in zero dimension of space-time, dressed Feynman (skeleton) diagrams are enumerated. Such diagram counts provide useful basic checks for extensions of the theory for future realistic simulations.

Molinari, L G; Molinari, Luca Guido; Manini, Nicola

2005-01-01

342

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

343

Krajewski diagrams and the Standard Model  

OpenAIRE

This paper provides a complete list of Krajewski diagrams representing the standard model of particle physics. We will give the possible representations of the algebra and the anomaly free lifts which provide the representation of the standard model gauge group on the fermionic Hilbert space. The algebra representations following from the Krajewski diagrams are not complete in the sense that the corresponding spectral triples do not necessarily obey to the axiom of Poincare ...

Stephan, Christoph A.

2008-01-01

344

Analyzing genomes with cumulative skew diagrams.  

OpenAIRE

A novel method of cumulative diagrams shows that the nucleotide composition of a microbial chromosome changes at two points separated by about a half of its length. These points coincide with sites of replication origin and terminus for all bacteria where such sites are known. The leading strand is found to contain more guanine than cytosine residues. This fact is used to predict origin and terminus locations in other bacterial and archaeal genomes. Local changes, visible as diagram distortio...

Grigoriev, A.

1998-01-01

345

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

346

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

2012-09-01

347

Enabling the usage of UML in the verification of railway systems: The DAM-rail approach  

International Nuclear Information System (INIS)

The need for integration of model-based verification into industrial processes has produced several attempts to define Model-Driven solutions implementing a unifying approach to system development. A recent trend is to implement tool chains supporting the developer both in the design phase and V and V activities. In this Model-Driven context, specific domains require proper modelling approaches, especially for what concerns RAM (Reliability, Availability, Maintainability) analysis and fulfillment of international standards. This paper specifically addresses the definition of a Model-Driven approach for the evaluation of RAM attributes in railway applications to automatically generate formal models. For this aim we extend the MARTE-DAM UML profile with concepts related to maintenance aspects and service degradation, and show that the MARTE-DAM framework can be successfully specialized for the railway domain. Model transformations are then defined to generate Repairable Fault Tree and Bayesian Network models from MARTE-DAM specifications. The whole process is applied to the railway domain in two different availability studies

348

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

2012-10-01

349

Introduction to causal diagrams for confounder selection.  

Science.gov (United States)

In respiratory health research, interest often lies in estimating the effect of an exposure on a health outcome. If randomization of the exposure of interest is not possible, estimating its effect is typically complicated by confounding bias. This can often be dealt with by controlling for the variables causing the confounding, if measured, in the statistical analysis. Common statistical methods used to achieve this include multivariable regression models adjusting for selected confounding variables or stratification on those variables. Therefore, a key question is which measured variables need to be controlled for in order to remove confounding. An approach to confounder-selection based on the use of causal diagrams (often called directed acyclic graphs) is discussed. A causal diagram is a visual representation of the causal relationships believed to exist between the variables of interest, including the exposure, outcome and potential confounding variables. After creating a causal diagram for the research question, an intuitive and easy-to-use set of rules can be applied, based on a foundation of rigorous mathematics, to decide which measured variables must be controlled for in the statistical analysis in order to remove confounding, to the extent that is possible using the available data. This approach is illustrated by constructing a causal diagram for the research question: 'Does personal smoking affect the risk of subsequent asthma?'. Using data taken from the Tasmanian Longitudinal Health Study, the statistical analysis suggested by the causal diagram approach was performed. PMID:24447391

Williamson, Elizabeth J; Aitken, Zoe; Lawrie, Jock; Dharmage, Shyamali C; Burgess, John A; Forbes, Andrew B

2014-04-01

350

CVD phase diagrams for iridium films preparation  

International Nuclear Information System (INIS)

Chemical vapor deposition (CVD) phase diagrams for the preparation of iridium films were calculated using Gibbs free energy minimization method. Iridium acetylacetonate (Ir(acac)3) was used as the precursor compound. Two gaseous mixtures were analyzed: Ir(acac)3-O2-Ar and Ir(acac)3-Ar. The deposition temperatures were explored from 300 to 800 degree centigree total pressures from 13.3 to 13.332 Pa and partial pressures of Ir(acac)3 gas and O2 gas from 0.001 to 1.000 Pa. the Ir-CVD diagrams predicted that without O2 gas in the gaseous mixture, the solid films consist of two solid phases: Ir+C. In contrast, with addition of O2 to the gaseous mixture, the Ir-CVD diagrams revealed different domains of condensed phases which include IrO2, IrO2+Ir, Ir and Ir+C. These diagrams allow one to establish the total pressures and temperatures required to obtain a given film composition. The results predicted by the Ir-CVD diagrams are in good agreement with those experimentally obtained. (Author) 20 refs

351

State diagrams of main alloy systems on titanium base  

International Nuclear Information System (INIS)

State diagrams of binary and ternary metallic titanium-base alloys and state diagrams of Ti-H, Ti-N, Ti-C, Ti-O systems are considered. High temperature cross sections of ternary alloy diagrams are given. The principles of plotting metastable diagrams of phase composition of hardened binary and ternary titanium alloys are given

352

Verifying service continuity in a satellite reconfiguration procedure: application to a satellite  

OpenAIRE

The paper discusses the use of the TURTLE UML profile to model and verify service continuity during dynamic reconfiguration of embedded software, and space-based telecommunication software in particular. TURTLE extends UML class diagrams with composition operators, and activity diagrams with temporal operators. Translating TURTLE to the formal description technique RT-LOTOS gives the profile a formal semantics and makes it possible to reuse verification techniques implemented by the RTL, the ...

Apvrille, Ludovic; Saqui-sannes, Pierre; Se?nac, Patrick; Lohr, Christophe

2004-01-01

353

Interface in potts ferromagnet: phase diagram and critical exponents  

International Nuclear Information System (INIS)

Within a real-space renormalisation-group framework, the q-state Potts ferromagnet is treated in a simple cubic lattice constituted by two different semi-infinite bulks (respectively characterized by the coupling constants J1 and J2) separated by a (1, 0, 0) interface (characterized by J sub(S)). The use of a rather sophisticated two-terminal cluster enables a quite reliable discussion of the phase diagram and its universality classes. Four physically different phases are obtained, namely the paramagnetic and the double-bulk and surface ferromagnetic ones. The critical surface contains a multicritical line (associated with J1 noy= J2) which in turn contains a special point associated with J1 = J2. (Author)

354

Inferring Information from Feature Diagrams to Product Line Economic Models  

CERN Document Server

Existing economic models support the estimation of the costs and benefits of developing and evolving a Software Product Line (SPL) as compared to undertaking traditional software development approaches. In addition, Feature Diagrams (FDs) are a valuable tool to scope the domain of a SPL. This paper proposes an algorithm to calculate, from a FD, the following information for economic models: the total number of products of a SPL, the SPL homogeneity and the commonality of the SPL requirements. The algorithm running time belongs to the complexity class $O(f^42^c)$. In contrast to related work, the algorithm is free of dependencies on off-the-self tools and is generally specified for an abstract FD notation, that works as a pivot language for most of the available notations for feature modeling.

Fernandez-Amoros, David; Cerrada, Jose Antonio

2009-01-01

355

The plutonium-oxygen phase diagram  

International Nuclear Information System (INIS)

Identification of products formed by the reaction of plutonium metal with liquid water at 23 degree C indicates that the plutonium-oxygen phase diagram is similar to the cerium-oxygen and praseodymium-oxygen diagrams. Quantitative measurements of H2 formation and analytical data suggest that a sequence of hydrolysis reactions produces oxide hydrides of trivalent plutonium, Pu2O3, mixed-valent oxides and PuO2. The intermediate oxides are the n = 7, 9, 10 and 12 members of the PunO2n-2 homologous series. Properties of the residue formed by thermal decomposition of the initial hydrolysis product, plutonium monoxide monhydride (PuOH), are consistent with the formation of metastable plutonium monoxide. Crystal-chemical, thermodynamic, and kinetic factors are evaluated, but definitive assignment of the equilibrium Pu-O diagram is not possible. 22 refs., 6 figs., 1 tab

356

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

357

Phase diagrams of diluted transverse Ising nanowire  

Energy Technology Data Exchange (ETDEWEB)

In this paper, the phase diagrams of diluted Ising nanowire consisting of core and surface shell coupling by J{sub cs} exchange interaction are studied using the effective field theory with a probability distribution technique, in the presence of transverse fields in the core and in the surface shell. We find a number of characteristic phenomena. In particular, the effect of concentration c of magnetic atoms, the exchange interaction core/shell, the exchange in surface and the transverse fields in core and in surface shell of phase diagrams are investigated. - Highlights: ? We use the EFT to investigate the phase diagrams of Ising transverse nanowire. ? Ferrimagnetic and ferromagnetic cases are investigated. ? The effects of the dilution and the transverse fields in core and shell are studied. ? Behavior of the transition temperature with the exchange interaction is given.

Bouhou, S.; Essaoudi, I. [Laboratoire de Physique des Matériaux et Modélisation, des Systèmes, (LP2MS), Unité Associée au CNRST-URAC 08, University of Moulay Ismail, Physics Department, Faculty of Sciences, B.P. 11201 Meknes (Morocco); Ainane, A., E-mail: ainane@pks.mpg.de [Laboratoire de Physique des Matériaux et Modélisation, des Systèmes, (LP2MS), Unité Associée au CNRST-URAC 08, University of Moulay Ismail, Physics Department, Faculty of Sciences, B.P. 11201 Meknes (Morocco); Max-Planck-Institut für Physik Complexer Systeme, Nöthnitzer Str. 38 D-01187 Dresden (Germany); Saber, M. [Laboratoire de Physique des Matériaux et Modélisation, des Systèmes, (LP2MS), Unité Associée au CNRST-URAC 08, University of Moulay Ismail, Physics Department, Faculty of Sciences, B.P. 11201 Meknes (Morocco); Max-Planck-Institut für Physik Complexer Systeme, Nöthnitzer Str. 38 D-01187 Dresden (Germany); Ahuja, R. [Condensed Matter Theory Group, Department of Physics and Astronomy, Uppsala University, 75120 Uppsala (Sweden); Dujardin, F. [Laboratoire de Chimie et Physique des Milieux Complexes (LCPMC), Institut de Chimie, Physique et Matériaux (ICPM), 1 Bd. Arago, 57070 Metz (France)

2013-06-15

358

Phase diagrams of diluted transverse Ising nanowire  

International Nuclear Information System (INIS)

In this paper, the phase diagrams of diluted Ising nanowire consisting of core and surface shell coupling by Jcs exchange interaction are studied using the effective field theory with a probability distribution technique, in the presence of transverse fields in the core and in the surface shell. We find a number of characteristic phenomena. In particular, the effect of concentration c of magnetic atoms, the exchange interaction core/shell, the exchange in surface and the transverse fields in core and in surface shell of phase diagrams are investigated. - Highlights: ? We use the EFT to investigate the phase diagrams of Ising transverse nanowire. ? Ferrimagnetic and ferromagnetic cases are investigated. ? The effects of the dilution and the transverse fields in core and shell are studied. ? Behavior of the transition temperature with the exchange interaction is given

359

Phase diagram of the excitonic insulator  

CERN Document Server

Motivated by recent experiments, which give strong evidence for an excitonic insulating phase in $\\rm TmSe_{0.45}Te_{0.55}$, we developed a scheme to quantitatively construct, for generic two-band models, the phase diagram of an excitonic insulator. As a first application of our approach, we calculated the phase diagram for an effective mass two-band model with long-range Coulomb interaction. The shielded potential approximation is used to derive a generalised gap equation controlling for positive (negative) energy gaps the transition from a semi-conducting (semi-metallic) phase to an insulating phase. Numerical results, obtained within the quasi-static approximation, show a steeple-like phase diagram in contrast to long-standing expectations.

Hülsen, B; Fehske, H; Yonemitsu, K

2006-01-01

360

Bijections between pattern-avoiding fillings of Young diagrams  

OpenAIRE

The pattern-avoiding fillings of Young diagrams we study arose from Postnikov's work on positive Grassman cells. They are called Le-diagrams, and are in bijection with decorated permutations. Other closely-related diagrams are interpreted as acyclic orientations of some bipartite graphs. The definition of the diagrams is the same but the avoided patterns are different. We give here bijections proving that the number of pattern-avoiding filling of a Young diagram is the same,...

Josuat-verge?s, Matthieu

2008-01-01

361

A pseudo-haptic knot diagram interface  

Science.gov (United States)

To make progress in understanding knot theory, we will need to interact with the projected representations of mathematical knots which are of course continuous in 3D but significantly interrupted in the projective images. One way to achieve such a goal would be to design an interactive system that allows us to sketch 2D knot diagrams by taking advantage of a collision-sensing controller and explore their underlying smooth structures through a continuous motion. Recent advances of interaction techniques have been made that allow progress to be made in this direction. Pseudo-haptics that simulates haptic effects using pure visual feedback can be used to develop such an interactive system. This paper outlines one such pseudo-haptic knot diagram interface. Our interface derives from the familiar pencil-and-paper process of drawing 2D knot diagrams and provides haptic-like sensations to facilitate the creation and exploration of knot diagrams. A centerpiece of the interaction model simulates a "physically" reactive mouse cursor, which is exploited to resolve the apparent conflict between the continuous structure of the actual smooth knot and the visual discontinuities in the knot diagram representation. Another value in exploiting pseudo-haptics is that an acceleration (or deceleration) of the mouse cursor (or surface locator) can be used to indicate the slope of the curve (or surface) of whom the projective image is being explored. By exploiting these additional visual cues, we proceed to a full-featured extension to a pseudo-haptic 4D visualization system that simulates the continuous navigation on 4D objects and allows us to sense the bumps and holes in the fourth dimension. Preliminary tests of the software show that main features of the interface overcome some expected perceptual limitations in our interaction with 2D knot diagrams of 3D knots and 3D projective images of 4D mathematical objects.

Zhang, Hui; Weng, Jianguang; Hanson, Andrew J.

2011-01-01

362

Thermal Bubble Diagrams Near Zero Energy  

OpenAIRE

The zero four-momentum and equal mass limits are taken for the bubble diagram of scalar fields. It is seen that RTF and ITF are in complete agreement. However contributions from this diagram to both retarded and time-ordered functions do depend on the order of the limits and can be infinite in some cases. This shows explicitly that the relation between the free energy and a derivative expansion of a thermal effective action is generally much more complicated that is the case...

Evans, Ts

1993-01-01

363

Thermal bubble diagrams near zero energy  

CERN Document Server

The zero four-momentum and equal mass limits are taken for the bubble diagram of scalar fields. It is seen that RTF and ITF are in complete agreement. However contributions from this diagram to both retarded and time-ordered functions do depend on the order of the limits and can be infinite in some cases. This shows explicitly that the relation between the free energy and a derivative expansion of a thermal effective action is generally much more complicated that is the case at zero temperature.

Evans, T S

1993-01-01

364

On Realizing Diagrams of Pi-algebras  

CERN Document Server

Given a diagram of Pi-algebras (graded groups equipped with an action of the primary homotopy operations), we ask whether it can be realized as the homotopy groups of a diagram of spaces. The answer given here is in the form of an obstruction theory, of somewhat wider application, formulated in terms of generalized Pi-algebras. This extends a program begun by Dwyer, Kan, and Stover to study the realization of a single Pi-algebra. In particular, we explicitly analyze the simple case of a single map, and provide a detailed example, illustrating the connections to higher homotopy operations.

Blanc, D; Turner, J M; Blanc, David; Johnson, Mark W.; Turner, James M.

2006-01-01

365

Phase diagram of silicon from atomistic simulations  

CERN Document Server

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 ${Si}_{34}$ 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; Hernandez, E R

2005-01-01

366

Computer generated timing diagrams to supplement simulation  

CERN Document Server

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

367

The computation of shakedown limits for structural components subjected to variable thermal loading - Brussels diagrams  

International Nuclear Information System (INIS)

Structures submitted to a constant primary load and a cyclic (thermal) secondary load may for certain combinations of load ratio, geometry and material properties undergo ratchetting, i.e. a situation where the strains increase at each cycle of the applied thermal load until failure or prohibitively large accumulated deformations occur. This report resulting from CEC Study Contract RAP-054-UK having mainly fast breeder reactor applications in mind, discusses the so-called Brussels diagrams which are a practical tool for the designer for assessing a particular design situation with respect to ratchetting. Brussels diagrams show four regions: elastic, shakedown, reverse plasticity and ratchetting. The theory of Brussels diagrams is presented. It is the upper bound shakedown theory, specialized for axisymmetric shell elements and in which the upper bound is minimized by linear programming techniques. This theory is extended to the reverse plasticity region and has been implemented in two finite element axisymmetric shell programs which calculate a sequence of points on the ratchetting boundary. Three classes of problems are discussed: (i) The uniaxial transient Bree problem. (ii) The cylindrical tube subjected to axial load and stationary or moving temperature discontinuity. (iii) A range of Brussels diagrams for axisymmetric geometries and thermal loadings typical of LMFBRs. The discussion includes comparisons with some experiments and considerations on the sensitivity of the diagrams to the material assumptions

368

Employing UMLS for generating hints in a tutoring system for medical problem-based learning.  

Science.gov (United States)

While problem-based learning has become widely popular for imparting clinical reasoning skills, the dynamics of medical PBL require close attention to a small group of students, placing a burden on medical faculty, whose time is over taxed. Intelligent tutoring systems (ITSs) offer an attractive means to increase the amount of facilitated PBL training the students receive. But typical intelligent tutoring system architectures make use of a domain model that provides a limited set of approved solutions to problems presented to students. Student solutions that do not match the approved ones, but are otherwise partially correct, receive little acknowledgement as feedback, stifling broader reasoning. Allowing students to creatively explore the space of possible solutions is exactly one of the attractive features of PBL. This paper provides an alternative to the traditional ITS architecture by using a hint generation strategy that leverages a domain ontology to provide effective feedback. The concept hierarchy and co-occurrence between concepts in the domain ontology are drawn upon to ascertain partial correctness of a solution and guide student reasoning towards a correct solution. We describe the strategy incorporated in METEOR, a tutoring system for medical PBL, wherein the widely available UMLS is deployed and represented as the domain ontology. Evaluation of expert agreement with system generated hints on a 5-point likert scale resulted in an average score of 4.44 (Spearman's ?=0.80, p<0.01). Hints containing partial correctness feedback scored significantly higher than those without it (Mann Whitney, p<0.001). Hints produced by a human expert received an average score of 4.2 (Spearman's ?=0.80, p<0.01). PMID:22429987

Kazi, Hameedullah; Haddawy, Peter; Suebnukarn, Siriwan

2012-06-01

369

Mechanix: A Sketch-Based Tutoring and Grading System for Free-Body Diagrams  

OpenAIRE

Introductory engineering courses within large universities often have annual enrollments which can reach up to a thousand students. It is very challenging to achieve differentiated instruction in classrooms with class sizes and student diversity of such great magnitude. Professors can only assess whether students have mastered a concept by using multiple choice questions, while detailed homework assignments, such as planar truss diagrams, are rarely assigned because professors and teaching as...

Valentine, Stephanie Texas A. M. University; Vides, Francisco Texas A. M. University; Lucchese, George Texas A. M. University; Turner, David Texas A. M. University; Kim, Hong-hoe Texas A. M. University; Li, Wenzhe Texas A. M. University; Linsey, Julie Texas A. M. University; Hammond, Tracy Texas A. M. University

2012-01-01

370

Representations of Cuntz-Krieger relations, dynamics on Bratteli diagrams, and path-space measures  

OpenAIRE

We study a new class of representations of the Cuntz-Krieger algebras $\\mathcal O_A$ constructed by semibranching function systems, naturally related to stationary Bratteli diagrams. The notion of isomorphic semibranching function systems is defined and studied. We show that any isomorphism of such systems implies the equivalence of the corresponding representations of Cuntz-Krieger algebra $\\mathcal O_A$. In particular, we show that equivalent measures generate equivalent r...

Bezuglyi, Sergey; Jorgensen, Palle E. T.

2014-01-01

371

(SI) State-of-the-art models for the phase diagram of carbon and diamond nucleation  

OpenAIRE

Abstract We review recent developments in the modelling of the phase diagram and the kinetics of crystallization of carbon. In particular, we show that a particular class of bond-order potentials (the so-called LCBOP models) account well for many of the known structural and thermodynamic properties of carbon at high pressures and temperatures. We discuss the LCBOP models in some detail. In addition, we briefly review the ``history'' of experimental and theoreti...

Ghringhelli, Luca; Valeriani, Chantal; Los, Jan; Meijer, Evert Jan; Fasolino, Annalisa; Frenkel, Daan

2008-01-01

372

Vertex Models and Random Labyrinths: Phase Diagrams for Ice-type Vertex Models  

CERN Document Server

We propose a simple geometric recipe for constructing phase diagrams for a general class of vertex models obeying the ice rule. The disordered phase maps onto the intersecting loop model which is interesting in its own right and is related to several other statistical mechanical models. This mapping is also useful in understanding some ordered phases of these vertex models as they correspond to the polymer loop models with cross-links in their vulcanised phase.

Shtengel, K; Shtengel, Kirill

2004-01-01

373

HOW VISIO 2003 CAN INFLUENCE INFORMATION TECHNOLOGY–CREATING UML MODELS  

OpenAIRE

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 ...

Lupasc, Adrian

2005-01-01

374

Tadpole diagrams and relativistic Hartree approximation  

International Nuclear Information System (INIS)

It is pointed out that the infinite series of the tadpole contribution to the baryon self-energy can be summed rigorously and expressed in a simple form. The latter provides a new way for the calculation and explains more clearly the relation between Walecka's mean field theory and the tadpole diagrams

375

Venn Diagram Approach to Heisenberg Inequalities  

Directory of Open Access Journals (Sweden)

Full Text Available We report on a proof to the Heisenberg inequalities, for both vector-like and scalar-like variables, that is basedon statistical dependence of quantum events on appropriate Venn diagrams. A similar proof is provided for the“energy-velocity” uncertainty principle of Haidar (2010.

Nassar H. S. Haidar

2012-04-01

376

Generalized performance diagrams for steam turbine systems  

International Nuclear Information System (INIS)

Two generalized diagrams have been prepared for the steam turbine performance estimate. The diagrams can predict the turbine net heat rate for various turbine exhaust pressures and loadings. The turbine systems covered in these diagrams have the steam conditions either supercritical or subcritical, and the power output in the range of 400,000 kW to 800,000 kW. The turbine has 4 or 6 exhaust flows and the last stage blade length 23, 26, 30 or 33.5 inches. The basic approach is to normalize the turbine heat rates and express them in terms of turbine heat rates and express them in terms of turbine output per unit area of exhaust flow. The turbine exhaust pressure is treated as a parameter. Approximately 30 steam turbine system have been simulated by computer and the performance data were utilized in the construction of the generalized diagrams. The values predicted by this approach are in good agreement with the actual data

377

Ferromagnetic phase diagram of neutron matter  

CERN Document Server

The magnetic properties of matter under extreme conditions are of particular importance to understanding the neutron star interior. One contributing factor to the magnetic field of a neutron star could be the ferromagnetic phase of nuclear matter. In this letter we present a self-consistent, relativistic description of ferromagnetism in dense matter, within which the ferromagnetic phase diagram for neutron matter is calculated.

Diener, J P W

2010-01-01

378

Orphan-Free Anisotropic Voronoi Diagrams  

OpenAIRE

We describe conditions under which an appropriately-defined anisotropic Voronoi diagram of a set of sites in Euclidean space is guaranteed to be composed of connected cells in any number of dimensions. These conditions are natural for problems in optimization and approximation, and algorithms already exist to produce sets of sites that satisfy them.

Canas, Guillermo D.; Gortler, Steven J.

2011-01-01

379

Drawing conformal diagrams for a fractal landscape  

Science.gov (United States)

Generic models of cosmological inflation and the recently proposed scenarios of a recycling universe and the string theory landscape predict spacetimes whose global geometry is a stochastic, self-similar fractal. To visualize the complicated causal structure of such a universe, one usually draws a conformal (Carter-Penrose) diagram. I develop a new method for drawing conformal diagrams, applicable to arbitrary 1+1-dimensional spacetimes. This method is based on a qualitative analysis of intersecting lightrays and thus avoids the need for explicit transformations of the spacetime metric. To demonstrate the power and simplicity of this method, I present derivations of diagrams for spacetimes of varying complication. I then apply the lightray method to three different models of an eternally inflating universe (scalar-field inflation, recycling universe, and string theory landscape) involving the nucleation of nested asymptotically flat, de Sitter and/or anti-de Sitter bubbles. I show that the resulting diagrams contain a characteristic fractal arrangement of lines.

Winitzki, Sergei

2005-06-01

380

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)

381

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

382

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

383

Diagram of a LEP superconducting cavity  

CERN Multimedia

This diagram gives a schematic representation of the superconducting radio-frequency cavities at LEP. Liquid helium is used to cool the cavity to 4.5 degrees above absolute zero so that very high electric fields can be produced, increasing the operating energy of the accelerator. Superconducting cavities were used only in the LEP-2 phase of the accelerator, from 1996 to 2000.

1991-01-01

384

Fission stability diagram of 240Pu  

OpenAIRE

We have used an axially symmetric deformed Thomas-Fermi model to evaluate the fission barrier of 240Pu as a function of the quadrupole moment Q2 for different values of the angular momentum L and temperature T. The fission stability diagram of this nucleus is investigated.

Garcias, Francisca; Barranco Go?mez, Manuel; Wio, Horacio S.; Ngo?, Christian; Nemeth, J.

1989-01-01

385

Graphic lambda calculus and knot diagrams  

OpenAIRE

In arXiv:1207.0332 [cs.LO] was proposed a graphic lambda calculus formalism, which has sectors corresponding to untyped lambda calculus and emergent algebras. Here we explore the sector covering knot diagrams, which are constructed as macros over the graphic lambda calculus.

Buliga, Marius

2012-01-01

386

Phase diagram Be-H system  

International Nuclear Information System (INIS)

Hydrogen solubility in ?- and ?-beryllium modifications grows with temperature and its jump is observed during ??? transformation. Hydrogen solubility within the pressure range of 0-12 MPa obeys the law of the Seavert square root. Hydrogen decreases the melting point and ??? transformation of beryllium. The Be-H constitution diagram includes gas-eutectic and gas-eutectoid equilibria of gas

387

Planar quark diagrams and binary spin processes  

International Nuclear Information System (INIS)

Contributions of planar diagrams to the binary scattering processes are analyzed. The analysis is based on the predictions of quark-gluon picture of strong interactions for the coupling of reggeons with quarks as well as on the SU(6)-classification of hadrons. The dependence of contributions of nonplanar corrections on spins and quark composition of interacting particles is discussed

388

The Boundary Theory of Phase Diagrams and Its Application  

CERN Document Server

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

389

A Legal Negotiatiton Support System Based on A Diagram  

Science.gov (United States)

We present an overview of a legal negotiation support system, ANS (Argumentation based Negotiation support System). ANS consists of a user interface, three inference engines, a database of old cases, and two decision support modules. The ANS users negotiates or disputes with others via a computer network. The negotiation status is managed in the form of the negotiation diagram. The negotiation diagram is an extension of Toulmin’s argument diagram, and it contains all arguments insisted by participants. The negotiation protocols are defined as operations to the negotiation diagram. By exchanging counter arguments each other, the negotiation diagram grows up. Nonmonotonic reasoning using rule priorities are applied to the negotiation diagram.

Nitta, Katsumi; Shibasaki, Masato; Yasumura, Yoshiaki; Hasegawa, Ryuzo; Fujita, Hiroshi; Koshimura, Miyuki; Inoue, Katsumi; Shirai, Yasuyuki; Komatsu, Hiroshi

390

Five Year Results of US Intergroup/RTOG 9704 With Postoperative CA 19-9 ?90 U/mL and Comparison to the CONKO-001 Trial  

International Nuclear Information System (INIS)

Purpose: Radiation Therapy Oncology Group (RTOG) trial 9704 was the largest randomized trial to use adjuvant chemoradiation therapy for patients with pancreatic cancer. This report analyzes 5-year survival by serum level of tumor marker CA 19-9 of ?90 vs >90 U/mL and compares results to the those of the CONKO-001 trial. Methods and Materials: CA 19-9 expression was analyzed as a dichotomized variable (?90 vs >90 U/mL). Cox proportional hazard models were used to identify the impact of the CA 19-9 value on overall survival (OS). Actuarial estimates of OS were calculated using the Kaplan-Meier method. Results: Both univariate (hazard ratio [HR] = 3.2; 95% confidence interval [CI], 2.3-4.3, P<.0001) and multivariate (HR = 3.1; 95% CI, 2.2-4.2, P<.0001) analyses demonstrated a statistically significant decrease in OS for CA 19-9 serum level of ?90 U/mL. For patients in the gemcitabine (Gem) treatment arm with CA 19-9 <90 U/mL, median survival was 21 months. For patients with CA 19-9 ?90 U/mL, this number dropped to 10 months. In patients with pancreatic head tumors in the Gem treatment arm with RT quality assurance per protocol and CA 19-9 of <90 U/mL, median survival and 5-year rate were 24 months and 34%. In comparison, the median survival and 5-year OS rate for patients in the Gem arm of the CONKO trial were 22 months and 21%. Conclusions: This analysis demonstrates that patients with postresection CA 19-9 values ?90 U/mL had a significantly worse survival. P significantly worse survival. Patients with pancreatic head tumors treated with Gem with CA 19-9 serum level of <90 U/mL and per protocol RT had favorable survival compared to that seen in the CONKO trial. CA 19-9 is a stratification factor for the current RTOG adjuvant pancreas trial (0848).

391

Five Year Results of US Intergroup/RTOG 9704 With Postoperative CA 19-9 {<=}90 U/mL and Comparison to the CONKO-001 Trial  

Energy Technology Data Exchange (ETDEWEB)

Purpose: Radiation Therapy Oncology Group (RTOG) trial 9704 was the largest randomized trial to use adjuvant chemoradiation therapy for patients with pancreatic cancer. This report analyzes 5-year survival by serum level of tumor marker CA 19-9 of {<=}90 vs >90 U/mL and compares results to the those of the CONKO-001 trial. Methods and Materials: CA 19-9 expression was analyzed as a dichotomized variable ({<=}90 vs >90 U/mL). Cox proportional hazard models were used to identify the impact of the CA 19-9 value on overall survival (OS). Actuarial estimates of OS were calculated using the Kaplan-Meier method. Results: Both univariate (hazard ratio [HR] = 3.2; 95% confidence interval [CI], 2.3-4.3, P<.0001) and multivariate (HR = 3.1; 95% CI, 2.2-4.2, P<.0001) analyses demonstrated a statistically significant decrease in OS for CA 19-9 serum level of {>=}90 U/mL. For patients in the gemcitabine (Gem) treatment arm with CA 19-9 <90 U/mL, median survival was 21 months. For patients with CA 19-9 {>=}90 U/mL, this number dropped to 10 months. In patients with pancreatic head tumors in the Gem treatment arm with RT quality assurance per protocol and CA 19-9 of <90 U/mL, median survival and 5-year rate were 24 months and 34%. In comparison, the median survival and 5-year OS rate for patients in the Gem arm of the CONKO trial were 22 months and 21%. Conclusions: This analysis demonstrates that patients with postresection CA 19-9 values {>=}90 U/mL had a significantly worse survival. Patients with pancreatic head tumors treated with Gem with CA 19-9 serum level of <90 U/mL and per protocol RT had favorable survival compared to that seen in the CONKO trial. CA 19-9 is a stratification factor for the current RTOG adjuvant pancreas trial (0848).

Berger, Adam C., E-mail: adam.berger@jefferson.edu [Thomas Jefferson University Hospital, Philadelphia, Pennsylvania (United States); Winter, Kathryn [RTOG Statistical Center, Philadelphia, Pennsylvania (United States); Hoffman, John P. [Fox Chase Cancer Center, Philadelphia, Pennsylvania (United States); Regine, William F. [University of Maryland Medical Systems, Baltimore, Maryland (United States); Abrams, Ross A. [Rush University Medical Center, Chicago, Illinois (United States); Safran, Howard [Division of Hematology/Oncology, The Miriam Hospital, Providence, Rhode Island (United States); Freedman, Gary M. [Fox Chase Cancer Center, Philadelphia, Pennsylvania (United States); Benson, Alan B. [Northwestern Memorial Hospital, Chicago, Illinois (United States); MacDonald, John [St. Vincent' s Comprehensive Cancer Center, New York, New York (United States); Willett, Christopher G. [Duke University Medical Center, Durham, North Carolina (United States)

2012-11-01

392

Kinetic diagram and free energy diagram for kinesin in microtubule-related motility.  

OpenAIRE

The theoretical formalism that shows how biochemistry (ATPase activity) is related to mechanics in muscle contraction can be extended to the role of kinesin in microtubule-related motility. The main features added are the freedom of kinesin molecules to come and go from the motility complex and the small number of operative kinesin molecules in some systems. The starting points for this kind of approach are the kinetic diagram of biochemical states and the corresponding free energy diagram fo...

Hill, T. L.

1986-01-01

393

Enumerating Markov Equivalence Classes of Acyclic Digraph Models  

OpenAIRE

Graphical Markov models determined by acyclic digraphs (ADGs), also called directed acyclic graphs (DAGs), are widely studied in statistics, computer science (as Bayesian networks), operations research (as influence diagrams), and many related fields. Because different ADGs may determine the same Markov equivalence class, it long has been of interest to determine the efficiency gained in model specification and search by working directly with Markov equivalence classes of AD...

Gillispie, Steven B.; Perlman, Michael D.

2013-01-01

394

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.

Nilufar Baghaei

2013-04-01

395

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

396

Surface Magnetic Phase Diagram of Tetragonal Manganites  

CERN Document Server

To gain insights into the fundamental and characteristic features of the surface of doped manganites, we constructed a general magnetic phase diagram of La$_{1-x}$Sr$_{x}$MnO$_3$ (001) surfaces in the plane spanned by $x$ and the bulk tetragonal distortion $c/a$, from the first-principles calculations. We found that the surfaces are quite different from the bulk in the sense that both the (La, Sr)O and MnO$_2$ terminated surfaces show strong tendency toward antiferromagnetism (A-type and C-type respectively). The basic physics governing the phase diagram can be understood in terms of the surface orbital polarizations. It is also found that the strong surface segregation of Sr atoms is mostly caused by the electrostatic interaction and will further enhance the tendency to surface antiferromagnetism.

Fang, Z; Fang, Zhong; Terakura, Kiyoyuki

2001-01-01

397

The geometry of on-shell diagrams  

Science.gov (United States)

The fundamental role of on-shell diagrams in quantum field theory has been recently recognized. On-shell diagrams, or equivalently bipartite graphs, provide a natural bridge connecting gauge theory to powerful mathematical structures such as the Grassmannian. We perform a detailed investigation of the combinatorial and geometric objects associated to these graphs. We mainly focus on their relation to polytopes and toric geometry, the Grassmannian and its stratification. Our work extends the current understanding of these connections along several important fronts, most notably eliminating restrictions imposed by planarity, positivity, reducibility and edge removability. We illustrate our ideas with several explicit examples and introduce concrete methods that considerably simplify computations. We consider it highly likely that the structures unveiled in this article will arise in the on-shell study of scattering amplitudes beyond the planar limit. Our results can be conversely regarded as an expansion in the understanding of the Grassmannian in terms of bipartite graphs.

Franco, Sebastián; Galloni, Daniele; Mariotti, Alberto

2014-08-01

398

Phase Diagrams of 3-MATRIX Model  

Science.gov (United States)

We study the phase diagram of the 3-matrix model. This model corresponds to the Blume-Emery-Griffiths (BEG) model on a random surface. The BEG model has parameters J and K which are the spin and the lattice-gas coupling respectively. If K = 0, it is the usual tri-critical Ising model. If K/J = 3, this model becomes the 3-state Potts model. These models are solved in the context of the Coulomb gas representation. The intermediate region K/J = 1 is equivalent to the 3-matrix chain model and we can solve it exactly using the orthogonal polynomial method. We find the 3rd order critical line on which the spin ordering phase transition occurs. This line ends at the 4th order critical point which corresponds to the tri-critical point of the BEG model. The phase diagram is quite similar to that of the BEG model on a regular lattice.

Fukazawa, Kenji; Hamada, Ken-Ji; Sato, Harutada

399

1-loop Color structures and sunny diagrams  

CERN Document Server

Recently the space of tree level color structures for gluon scattering was determined in arXiv:1403.6837 together with its transformation properties under permutations. Here we generalize the discussion to loops, demonstrating a reduction of an arbitrary color diagram to its vacuum skeleton plus rays. For 1-loop there are no residual relations and we determine the space of color structures both diagrammatically and algebraically in terms of certain sunny diagrams. We present the generating function for the characteristic polynomials and a list of irreducible representations for $3 \\le n \\le 9$ external legs. Finally we present a new proof for the 1-loop shuffle relations based on the cyclic shuffle and split operations.

Kol, Barak

2014-01-01

400

Automating First-Principles Phase Diagram Calculations  

CERN Document Server

Devising a computational tool that assesses the thermodynamic stability of materials is among the most important steps required to build a ``virtual laboratory'', where materials could be designed from first-principles without relying on experimental input. Although the formalism that allows the calculation of solid state phase diagrams from first principles is well established, its practical implementation remains a tedious process. The development of a fully automated algorithm to perform such calculations serves two purposes. First, it will make this powerful tool available to large number of researchers. Second, it frees the calculation process from arbitrary parameters, guaranteeing that the results obtained are truly derived from the underlying first-principles calculations. The proposed algorithm formalizes the most difficult step of phase diagram calculations, namely the determination of the ``cluster expansion'', which is a compact representation of the configurational dependence of the alloy's energ...

De van Walle, A

2002-01-01

401

Reheating Phase Diagram for Higgs Inflation  

CERN Document Server

We investigate the impact on the inflationary predictions from various reheating histories which are characterized by an e-folding number $N_{\\mathrm{reh}}$ and an effective equation-of-state parameter $w_{\\mathrm{reh}}$ during reheating process. For Higgs inflation with a non-minimal coupling to gravity, the predictions are obtained on the $N_{\\mathrm{reh}}\\!\\!-\\!w_{\\mathrm{reh}}$ reheating phase diagram. We find that the predictions are insensitive to reheating phase. Within the $1\\sigma$ region of the scalar spectral index $n_s$ reported by Planck 2014 Preliminary, almost all possible reheating histories are allowed on the reheating phase diagram, where Higgs inflation with canonical reheating history $w_{\\mathrm{reh}}=0$ lies near the upper edge of the $1\\sigma$ range of $n_s$. Future measurements of $n_s$ with high precision will identify the reheating physics of Higgs inflation.

Cai, Rong-Gen; Wang, Shao-Jiang

2015-01-01

402

Jamming phase diagram for frictional particles  

OpenAIRE

The non-equilibrium transition from a fluid-like state to a disordered solid-like state, known as the jamming transition, occurs in a wide variety of physical systems, such as colloidal suspensions and molecular fluids, when the temperature is lowered or the density increased. Shear stress, as temperature, favors the fluid-like state, and must be also considered to define the system 'jamming phase diagram' [1-4]. Frictionless athermal systems [1], for instance, can be descri...

Ciamarra, M. Pica; Pastore, R.; Nicodemi, M.; Coniglio, A.

2009-01-01

403

Iron-carbon-hydrogen phase diagram  

International Nuclear Information System (INIS)

Quenching and thermography of Fe-C alloys containing up to 2% C at hydrogen pressures of up to 500 atm. have been used to obtain information about hydrogen effect on eutectoid equilibrium coordinates and cementite solubility in austenite. Hydrogen reduces the eutectoid equilibrium point and carbon solubility in austenite by forming, like carbon, the interstitial solid solutions. The experimental results have enabled the ''iron'' angle of the Fe-C-H state diagrams to be plotted which covers the eutectoid equilibrium region

404

Automatic placement of link labels in diagrams  

OpenAIRE

While diagrams play a central role in the software lifecycle, computer-based modeling tools are often not used in practice. At least to some extent, this is due to their lack of exibility and support of recurring and tedious \\model administration" tasks. Such tasks, like the rearrangement of existing model elements to provide the space required by a new element or the manual adjustment of lines after moving an element, distract the user from the actual modeling activi...

Reinhard, T.; Glinz, M.

2010-01-01

405

Phase diagram of InBi-Ga  

International Nuclear Information System (INIS)

State diagram of quasibinary InBi-Ga system within the whole concentration interval is plotted on the basis of results of investigations by DTA, calorimetry, viscosity, magnetic susceptibility and x-ray phase analysis methods. Decomposition range is detected in InBi-Ga system, its concentrational boundaries and critical temperature are found. Low-melting eutectics temperature on the part of gallium is detected

406

Anomaly diagram contribution in ?- lepton decay  

International Nuclear Information System (INIS)

The branching ratio of the ?- ? ??- ?? decay channel according to the obtained expression of weak hadron currents between pseudoscalar and vector meson states is equal to zero. This channel can be realized via effects of secondary importance, for example, via anomaly diagrams. Using Lagrangian we have defined the acquired matrix element of this process. Further the obtained partial width for the ?- ? ??-?? decay channel is discussed and compared with the available theoretical and experimental data. (A.A.D.)

407

Bifurcation diagram for compartmentalized granular gases  

OpenAIRE

The bifurcation diagram for a vibro-fluidized granular gas in N connected compartments is constructed and discussed. At vigorous driving, the uniform distribution (in which the gas is equi-partitioned over the compartments) is stable. But when the driving intensity is decreased this uniform distribution becomes unstable and gives way to a clustered state. For the simplest case, N=2, this transition takes place via a pitchfork bifurcation but for all N>2 the transition involv...

Meer, Devaraj; Weele, Ko; Lohse, Detlef

2001-01-01

408

An updated Gamma Ray Bursts Hubble diagram  

OpenAIRE

Gamma ray bursts (GRBs) have recently attracted much attention as a possible way to extend the Hubble diagram to very high redshift. To this aim, the luminosity (or isotropic emitted energy) of a GRB at redshift z must be evaluated from a correlation with a distance independent quantity so that one can then solve for the luminosity distance D_L(z) and hence the distance modulus mu(z). Averaging over five different two parameters correlations and using a fiducial cosmological...

Capozziello, Salvatore

2009-01-01

409

Magnetic phase diagram of UNiGa  

International Nuclear Information System (INIS)

We present a complex magnetic phase diagram of UNiGa with several antiferromagnetic (AF) phases below TN=39.5 K. A relatively low magnetic field ( similar 1 T) applied along the c-axis induces a transition from the AF phases to an uncompensated AF and/or a ferromagnetic (F) phase. All the magnetic structures are collinear (?U parallel c) and consist of ferromagnetic basal-plane sheets with various coupling along c. ((orig.))

410

Homeomorphic measures on stationary Bratteli diagrams  

OpenAIRE

We study the set S of ergodic probability Borel measures on stationary non-simple Bratteli diagrams which are invariant with respect to the tail equivalence relation. Equivalently, the set S is formed by ergodic probability measures invariant with respect to aperiodic substitution dynamical systems. The paper is devoted to the classification of measures $\\mu$ from S with respect to a homeomorphism. The properties of these measures related to the clopen values set $S(\\mu)$ ar...

Bezuglyi, S.; Karpel, O.

2010-01-01

411

Pore formation phase diagrams for lipid membranes  

Science.gov (United States)

Critical lateral pressure for a pore formation and phase diagram of porous membrane are derived analytically as functions of the microscopic parameters of the lipid chains. The derivation exploits path-integral calculation of the free energy of the ensembles of semi-flexible strings and rigid rods that mimic the hydrophobic tails of lipids in the lipid bilayers and bolalipid membranes respectively. Analytical expressions for the area stretch/compressibility moduli of the membranes are derived in both models.

Mukhin, S. I.; Kheyfets, B. B.

2014-05-01

412

Fluctuations and the QCD phase diagram  

OpenAIRE

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 diagra...

Schaefer, Bernd-jochen

2011-01-01

413

The QCD phase diagram: Results and challenges  

CERN Document Server

I review the progress made in recent years with functional methods in our understanding of the QCD phase diagram. In particular I discuss a renormalisation group approach to QCD at finite temperature and chemical potential. Results include the location of the confinement-deconfinement phase transition/cross-over and the chiral phase transition/cross-over lines, their nature as well as their interrelation.

Pawlowski, Jan M

2010-01-01

414

Binary decision diagrams and integer programming  

OpenAIRE

In dieser Arbeit zeigen wir, wie Binary Decision Diagrams (BDDs) als ein mächtiges Werkzeug für die 0/1 Ganzzahlige Programmierung (0/1 IP) und zugehörige polyedrische Probleme eingesetzt werden können. Wir entwickeln einen output-sensitiven Algorithmus zum Bauen eines Threshold BDDs, der die zulässigen 0/1 Lösungen einer linearen Ungleichung darstellt, und beschreiben eine parallele und-Operation für Threshold BDDs, um den BDD für ein 0/1 IP zu bauen. Des Weiteren konstruieren wir ei...

Behle, Markus

2007-01-01

415

Some Remarks on Non-Planar Diagrams  

CERN Document Server

Two criteria for planarity of a Feynman diagram upon its propagators (momentum flows) are presented. Instructive Mathematica programs that solve the problem and examples are provided. A simple geometric argument is used to show that while one can planarize non-planar graphs by embedding them on higher-genus surfaces (in the example it is a torus), there is still a problem with defining appropriate dual variables since the corresponding faces of the graph are absorbed by torus generators.

Bielas, Krzysztof; Gluza, Janusz; Riemann, Tord

2013-01-01

416

Subsectors, Dynkin Diagrams and New Generalised Geometries  

OpenAIRE

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 theor...

Strickland-constable, Charles

2013-01-01

417

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

2010-11-01

418

Energy Level Diagrams for Black Hole Orbits  

OpenAIRE

A spinning black hole with a much smaller black hole companion forms a fundamental gravitational system, like a colossal classical analog to an atom. In an appealing if imperfect analogy to atomic physics, this gravitational atom can be understood through a discrete spectrum of periodic orbits. Exploiting a correspondence between the set of periodic orbits and the set of rational numbers, we are able to construct periodic tables of orbits and energy level diagrams of the acc...

Levin, Janna

2009-01-01

419

SEMPA Measurements of Ferromagnetic Nanodisk Phase Diagrams  

Science.gov (United States)

We use Scanning Electron Microscopy with Polarization Analysis (SEMPA) to image the magnetic domain structures of ferromagnetic nanodisks with different diameters and thicknesses, and thereby determine the phase diagram of the ground state in these technologically important magnetic structures. Depending on the nanodisk dimensions, one of three distinct ground state magnetic configurations is observed: a single domain in-plane, a single domain out-of-plane, or a vortex state. In contrast to previous work, the magnetic states of individual nanodisks are determined using simultaneous SEMPA measurements of both the in-plane and out-of-plane magnetization components. By systematically imaging Permalloy nanodisks with diameters that range from 35 nm to 190 nm and with thicknesses that range from 10 nm to 65 nm, we are able to locate phase boundaries and the triple point between the three phases. Near the phase boundaries and triple point we observe a mixture of the different phases. A model magnetic phase diagram generated by using the OOMMF micromagnetic simulator is found to agree well with the phase diagram determined by the SEMPA measurements. This work is supported by the NIST-CNST/UMD-NanoCenter Cooperative Agreement.

Chung, Seok-Hwan; McMichael, Robert; Pierce, Daniel; Unguris, John

2009-03-01

420

Refined phase diagram of boron nitride  

International Nuclear Information System (INIS)

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

421

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

422

On the phase diagram of QCD  

International Nuclear Information System (INIS)

In this thesis we study two flavour Quantum Chromodynamics (QCD) with the Functional Renormalisation Group (FRG). We compute the QCD phase diagram at imaginary and real chemical potential in the chiral limit. We introduce dual order parameters which originate in the matter sector but are sensitive to center symmetry breaking. For real and imaginary chemical potential we find that the chiral and the confinement-deconfinement transitions agree. At vanishing chemical potential we obtain for the chiral transition Tc=181 MeV and for the confinement-deconfinement crossover Tc?178 MeV. The dual density and the Polyakov loop agree within the percent level. At imaginary chemical potential the phase diagram shows the expected Roberge-Weiss periodicity. This constitutes the first calculation of the QCD phase diagram at imaginary chemical potential in the chiral limit. At real chemical potential our results agree with lattice, DSE and FRG model studies. Then we compare the Yang-Mills (YM) and the glue Polyakov loop potential and match the temperature scales as the matter contributions to the gauge dynamics do not alter the form of the potential but the temperature scale. We use the translation of the two temperature scales in a Polyakov Quark Meson model, where we study the order parameters and the thermodynamic observables. The Polyakov loop potential thus approximates the glue dynamics instead of the YM dynamics. We find very good agreement for the thermodynamic observables with lattice results.

423

Diagram rigidity for geometric amalgamations of free groups  

OpenAIRE

We prove a topological rigidity result for simple, thick, hyperbolic P-manifolds of dimension 2: isomorphism of the fundamental groups implies homeomorphism of the P-manifolds. An immediate application is a diagram rigidity theorem for certain amalgamations of free groups: the direct limits of two such diagrams are isomorphic if and only if there is an isomorphism between the respective diagrams.

Lafont, J. -f

2005-01-01

424

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

425

Delta diagram based test for the Halphen (A and B) and the Gamma distributions  

Science.gov (United States)

The most used statistical distributions to fit extreme value data in hydrology, can be regrouped in three classes: class C of regularly varying distributions and class D of sub exponential distributions, depending on their tail behaviour. The Halphen distributions (Halphen type A (HA) and Halphen type B (HB)) have both the Gamma (G2) distribution as limiting case and all these three distributions belong to the class D and can be displayed in the (Delta1 = ln(A/G); Delta2 = ln(G/H)) moment ratio diagram based on Geometric (G), Arithmetic (A) and Harmonic (H) means. In this study, a statistical test for discriminating between HA, HB and the Gamma distribution is developed. The methodology is based on Monte Carlo simulation for (1) the determination of the confidence regions around the Gamma curve for each fixed couple (Delta1 , Delta2) and (2) the study of the power of the proposed test for both alternatives HA and HB distributions and comparison with the Likelihood Ratio Test (LRT). Results showed that the test is powerful especially for high values of skewness and is far better than the LRT. This test will be included, shortly, in Decision Support System (DSS) of the HYFRAN-PLUS software. Key words: Halphen distributions, Gamma distribution, Heavy tailed distribution, Monte Carlo simulation, (Delta1 , Delta2) diagram, power of the test, HYFRAN-PLUS.

El Adlouni, Salaheddine; Bobée, Bernard

2014-05-01

426

Deriving binary phase diagrams for chromonic materials in water mixtures via fluorescence spectroscopy: cromolyn and water.  

Science.gov (United States)

We report here the first example of a new and novel method of determining the binary temperature-composition phase diagram of a chromonic material in water using its intrinsic fluorescence. Disodium cromoglycate, or cromolyn, is an anti-allergy medicine representative of a class of compounds known as the chromonics. We have discovered that cromolyn's fluorescence is very sensitive to the polarity, hence structure, of the phase it exhibits. The fluorescence signal shifts its wavelength maximum and its shape depending on whether the cromolyn is a single phase or in coexisting phases. Since the signal due to individual phases can be identified, the fluorescence signal can reveal the temperature-induced transitions between single phase and phase coexistence regions. By studying such fluorescence data for different compositions, an isobaric temperature-composition phase diagram may be constructed. We present here a phase diagram derived from fluorescence studies that is in agreement with previous determinations using other techniques. Our results suggest that the binary phase diagrams of other intrinsically fluorescent chromonic materials, such as perylene monoimide and bisimide derivatives used in organic optoelectronic devices, solar cells, and light-emitting diodes, can be studied in water using an analogous fluorescence approach. PMID:25412321

Van Hecke, Gerald R; Karukstis, Kerry K; Rayermann, Scott

2014-12-10

427

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

2010-12-01

428

Teachers in Class  

Science.gov (United States)

In this article, I argue for a closer read of the daily "class work" of teachers, as posited by Reay, 1998. In developing exploratory class portraits of four teachers who occupy distinctive social positions (two from working-class homes now teaching upper-middle-class children and two from upper-middle-class homes now teaching poor children), I…

Van Galen, Jane

2008-01-01

429

Alternative diagnostic diagrams and the `forgotten' population of weak line galaxies in the SDSS  

Science.gov (United States)

A numerous population of weak line galaxies (WLGs) is often left out of statistical studies on emission-line galaxies (ELGs) due to the absence of an adequate classification scheme, since classical diagnostic diagrams, such as [OIII]/H? versus [NII]/H? (the BPT diagram), require the measurement of at least four emission lines. This paper aims to remedy this situation by transposing the usual divisory lines between star-forming (SF) galaxies and active galactic nuclei (AGN) hosts and between Seyferts and LINERs to diagrams that are more economical in terms of line quality requirements. By doing this, we rescue from the classification limbo a substantial number of sources and modify the global census of ELGs. More specifically, (1) we use the Sloan Digital Sky Survey Data Release 7 to constitute a suitable sample of 280000 ELGs, one-third of which are WLGs. (2) Galaxies with strong emission lines are classified using the widely applied criteria of Kewley et al., Kauffmann et al. and Stasi?ska et al. to distinguish SF galaxies and AGN hosts and Kewley et al. to distinguish Seyferts from LINERs. (3) We transpose these classification schemes to alternative diagrams keeping [NII]/H? as a horizontal axis, but replacing H? by a stronger line (H? or [OII]), or substituting the ionization-level sensitive [OIII]/H? ratio with the equivalent width of H? (WH?). Optimized equations for the transposed divisory lines are provided. (4) We show that nothing significant is lost in the translation, but that the new diagrams allow one to classify up to 50 per cent more ELGs. (5) Introducing WLGs in the census of galaxies in the local Universe increases the proportion of metal-rich SF galaxies and especially LINERs. In the course of this analysis, we were led to make the following points. (i) The Kewley et al. BPT line for galaxy classification is generally ill-used. (ii) Replacing [OIII]/H? by WH? in the classification introduces a change in the philosophy of the distinction between LINERs and Seyferts, but not in its results. Because the WH? versus [NII]/H? diagram can be applied to the largest sample of ELGs without loss of discriminating power between Seyferts and LINERs, we recommend its use in further studies. (iii) The dichotomy between Seyferts and LINERs is washed out by WLGs in the BPT plane, but it subsists in other diagnostic diagrams. This suggests that the right wing in the BPT diagram is indeed populated by at least two classes, tentatively identified with bona fide AGN and `retired' galaxies that have stopped forming stars and are ionized by their old stellar populations.

Cid Fernandes, R.; Stasi?ska, G.; Schlickmann, M. S.; Mateus, A.; Vale Asari, N.; Schoenell, W.; Sodré, L.

2010-04-01

430

A homotopy colimit theorem for diagrams of braided monoidal categories  

CERN Document Server

Thomason's Homotopy Colimit Theorem has been extended to bicategories and this extension can be adapted, through the delooping principle, to a corresponding theorem for diagrams of monoidal categories. In this version, we show that the homotopy type of the diagram can be also represented by a genuine simplicial set nerve associated with it. This suggests the study of a homotopy colimit theorem, for diagrams $\\b$ of braided monoidal categories, by means of a simplicial set {\\em nerve of the diagram}. We prove that it is weak homotopy equivalent to the homotopy colimit of the diagram, of simplicial sets, obtained from composing $\\b$ with the geometric nerve functor of braided monoidal categories.

Garzón, A R

2011-01-01

431

Jamming phase diagram for frictional particles.  

Science.gov (United States)

We investigate the jamming transition of frictional particulate systems via discrete element simulations, reporting the existence of new regimes, which are conveniently described in a jamming phase diagram with axes density, shear stress, and friction coefficient. The resulting jammed states are characterized by different mechanical and structural properties and appear not to be "fragile" as speculated. In particular, we find a regime, characterized by extremely long processes, with a diverging time scale, whereby a suspension first flows but then suddenly jams. We link this sudden jamming transition to the presence of impeded dilatancy. PMID:22181136

Ciamarra, Massimo Pica; Pastore, Raffaele; Nicodemi, Mario; Coniglio, Antonio

2011-10-01

432

On the iron-carbon phase diagram  

Science.gov (United States)

Experimental results that are obtained by electron microscopy, X-ray diffraction, and carbide analysis and indicate the precipitation of carbon atoms clusters in a hypereutectoid steel during its annealing above the eutectoid temperature are presented. These results are compared to the reported data in order to construct a new Fe-C phase diagram, where cementite forms below the eutectoid temperature due to the tendency of the Fe-C system toward ordering and carbon unbound to iron precipitates above this temperature in the form of clusters or graphite particles due to the tendency of this system toward phase separation.

Ustinovshikov, Yu. I.

2009-10-01

433

Thermal analysis and alloy phase diagrams  

International Nuclear Information System (INIS)

A summary of the activity performed in the investigation of metallic alloys over many years is presented. General attention is given to research carried out by using thermoanalytical techniques and their application to the determination of phase diagrams. The results obtained in the systematic investigation of several binary and ternary systems involving rare earth metals are briefly outlined and discussed within a more general picture of the alloying behaviour of these metals. A report with reference to the groups of alloys especially investigated and to a number of experimental difficulties encountered and solutions adopted is given

434

Planar diagram approach to the correlation problem  

Science.gov (United States)

We transpose an idea of 't Hooft from its context of Yang and Mills' theory of strongly interacting quarks to that of strongly correlated electrons in transition metal oxides, and show that a Hubbard model of N interacting electron species reduces, to leading order in N, to a sum of almost planar diagrams. The resulting generating functional and integral equations are very similar to those of the fluctuation exchange approximation of Bickers and Scalapino. This adds the Hubbard model at large N to the list of solvable models of strongly correlated electrons.

Foerster, D.

2000-02-01

435

Failure Assessment Diagram for Titanium Brazed Joints  

Science.gov (United States)

The interaction equation was used to predict failure in Ti-4V-6Al joints brazed with Al 1100 filler metal. The joints used in this study were geometrically similar to the joints in the brazed beryllium metering structure considered for the ATLAS telescope. This study confirmed that the interaction equation R(sub sigma) + R(sub Tau) = 1, where R(sub sigma) and R(sub Tau)are normal and shear stress ratios, can be used as conservative lower bound estimate of the failure criterion in ATLAS brazed joints as well as for construction of the Failure Assessment Diagram (FAD).

Flom, Yury; Jones, Justin S.; Powell, Mollie M.; Puckett, David F.

2011-01-01

436

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

437

More on phase diagram of Laponite  

OpenAIRE

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 r...

Ruzicka, B.; Zulian, L.; Ruocco, G.

2005-01-01

438

Applications of zero-suppressed decision diagrams  

CERN Document Server

A zero-suppressed decision diagram (ZDD) is a data structure to represent objects that typically contain many zeros. Applications include combinatorial problems, such as graphs, circuits, faults, and data mining. This book consists of four chapters on the applications of ZDDs.The first chapter by Alan Mishchenko introduces the ZDD. It compares ZDDs to BDDs, showing why a more compact representation is usually achieved in a ZDD. The focus is on sets of subsets and on sum-of-products (SOP) expressions. Methods to generate all the prime implicants (PIs), and to generate irredundant SOPs are shown

Sasao, Tsutomu

2014-01-01

439

Ten proposed rules of numerical diagrams  

Science.gov (United States)

Diagrams have been used for 3 centuries to present numerical information succinctly. Yet no complete, specific rules are available for their preparation, similar to the rules of grammar, syntax, and spelling of language. Some guidance is offered in the dozen books on graphics published in the United States in the past 40 years, and fragments appear in textbooks and manuals. But none of these is complete or consistent, and each offers at least one glaring contravention of the basic tenets of mathematics and logic.

Court, Arnold

440

Patterns in the sine map bifurcation diagram  

OpenAIRE

Numerical computations of bifurcation maps for one dimensional maps show patterns (regular jumps in point density) in the zones of chaotic behaviour. In this work, empiric formulas are given for these patterns for an entire class of maps.

Lalescu, Cristian Constantin

2010-01-01

441

The phase diagram of random Boolean networks with nested canalizing functions  

CERN Document Server

We obtain the phase diagram of random Boolean networks with nested canalizing functions. Using the annealed approximation, we obtain the evolution of the number $b_t$ of nodes with value one, and the network sensitivity $\\lambda$, and we compare with numerical simulations of quenched networks. We find that, contrary to what was reported by Kauffman et al. [Proc. Natl. Acad. Sci. 2004 101 49 17102-7], these networks have a rich phase diagram, were both the "chaotic" and frozen phases are present, as well as an oscillatory regime of the value of $b_t$. We argue that the presence of only the frozen phase in the work of Kauffman et al. was due simply to the specific parametrization used, and is not an inherent feature of this class of functions. However, these networks are significantly more stable than the variants where all possible Boolean functions are allowed.

Peixoto, Tiago P

2010-01-01

442

Non Local Theories: New Rules for Old Diagrams  

CERN Document Server

We show that a general variant of the Wick theorems can be used to reduce the time ordered products in the Gell-Mann & 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';tau-tau')= - i (Delta_+(y-y')theta(tau-tau')+Delta_+(y'-y)theta(tau'-tau)), where the violations of locality and causality are represented by the dependence of tau,tau' on other points, besides those involved in the contraction. This leads naturally to a diagrammatic expansion of the Gell-Mann & 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 contribut...

Piacitelli, G

2004-01-01

443

Modified Growth Diagrams, Permutation Pivots, and the BXW map $\\phi^*$  

CERN Document Server

In their paper [1] on Wilf-equivalence for singleton classes, Backelin, Xin, and West introduce a transformation $\\phi^*$, defined by an iterative process and operating on (all) full rook placements on Ferrers boards. In [3], Bousquet-M$\\acute{\\textrm{e}}$lou and Steingr$\\acute{\\textrm{\\i}}$msson prove the analogue of the main result of [1] in the context of involutions, and in so doing they must prove that $\\phi^*$ commutes with the operation of taking inverses. The proof of this commutation result is long and difficult, and Bousquet-M$\\acute{\\textrm{e}}$lou and Steingr$\\acute{\\textrm{\\i}}$msson ask if $\\phi^*$ might be reformulated in such a way as to make this result obvious. In the present paper we provide such a reformulation of $\\phi^*$, by modifying the growth diagram algorithm of Fomin [4,5]. This also answers a question of Krattenthaler [6, problem 4], who notes that a bijection defined by the unmodified Fomin algorithm obviously commutes with inverses, and asks what the connection is between this bi...

Bloom, Jonathan

2011-01-01

444

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

445

Critical point analysis of phase envelope diagram  

Science.gov (United States)

Phase diagram or phase envelope is a relation between temperature and pressure that shows the condition of equilibria between the different phases of chemical compounds, mixture of compounds, and solutions. Phase diagram is an important issue in chemical thermodynamics and hydrocarbon reservoir. It is very useful for process simulation, hydrocarbon reactor design, and petroleum engineering studies. It is constructed from the bubble line, dew line, and critical point. Bubble line and dew line are composed of bubble points and dew points, respectively. Bubble point is the first point at which the gas is formed when a liquid is heated. Meanwhile, dew point is the first point where the liquid is formed when the gas is cooled. Critical point is the point where all of the properties of gases and liquids are equal, such as temperature, pressure, amount of substance, and others. Critical point is very useful in fuel processing and dissolution of certain chemicals. Here in this paper, we will show the critical point analytically. Then, it will be compared with numerical calculations of Peng-Robinson equation by using Newton-Raphson method. As case studies, several hydrocarbon mixtures are simulated using by Matlab.

Soetikno, Darmadi; Kusdiantara, Rudy; Puspita, Dila; Sidarto, Kuntjoro A.; Siagian, Ucok W. R.; Soewono, Edy; Gunawan, Agus Y.

2014-03-01

446

The Critical Importance of Russell's Diagram  

CERN Document Server

The idea of dwarf and giants stars, but not the nomenclature, was first established by Eijnar Hertzsprung in 1905; his first diagrams in support appeared in 1911. In 1913 Henry Norris Russell could demonstrate the effect far more strikingly because he measured the parallaxes of many stars at Cambridge, and could plot absolute magnitude against spectral type for many points. The general concept of dwarf and giant stars was essential in the galactic structure work of Harlow Shapley, Russell's first graduate student. In order to calibrate the period-luminosity relation of Cepheid variables, he was obliged to fall back on statistical parallax using only 11 Cepheids, a very sparse sample. Here the insight provided by the Russell diagram became critical. The presence of yellow K giant stars in globular clusters credentialed his calibration of the period-luminosity relation by showing that the calibrated luminosity of the Cepheids was comparable to the luminosity of the K giants. It is well known that in 1920 Shaple...

Gingerich, Owen

2013-01-01

447

Critical point analysis of phase envelope diagram  

Energy Technology Data Exchange (ETDEWEB)

Phase diagram or phase envelope is a relation between temperature and pressure that shows the condition of equilibria between the different phases of chemical compounds, mixture of compounds, and solutions. Phase diagram is an important issue in chemical thermodynamics and hydrocarbon reservoir. It is very useful for process simulation, hydrocarbon reactor design, and petroleum engineering studies. It is constructed from the bubble line, dew line, and critical point. Bubble line and dew line are composed of bubble points and dew points, respectively. Bubble point is the first point at which the gas is formed when a liquid is heated. Meanwhile, dew point is the first point where the liquid is formed when the gas is cooled. Critical point is the point where all of the properties of gases and liquids are equal, such as temperature, pressure, amount of substance, and others. Critical point is very useful in fuel processing and dissolution of certain chemicals. Here in this paper, we will show the critical point analytically. Then, it will be compared with numerical calculations of Peng-Robinson equation by using Newton-Raphson method. As case studies, several hydrocarbon mixtures are simulated using by Matlab.

Soetikno, Darmadi; Siagian, Ucok W. R. [Department of Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132 (Indonesia); Kusdiantara, Rudy, E-mail: rkusdiantara@s.itb.ac.id; Puspita, Dila, E-mail: rkusdiantara@s.itb.ac.id; Sidarto, Kuntjoro A., E-mail: rkusdiantara@s.itb.ac.id; Soewono, Edy; Gunawan, Agus Y. [Department of Mathematics, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132 (Indonesia)

2014-03-24

448

Trigeneration System: Visualization through Ternary Diagrams  

Directory of Open Access Journals (Sweden)

Full Text Available The simultaneous production of power, heat and refrigeration in trigeneration plants is potentially more efficient than producing these same utilities in separate facilities, mainly due to the increased opportunities for process integration. Hence, trigeneration is also inherently more cost-effective and thermodynamically efficient, resulting in lower CO2 footprint. Various methods have been developed for the synthesis of such plants. In this study, we propose a graphical approach where power, heat and refrigeration or cooling form the vertices of a ternary diagram. A thermal process unit may thus be represented as a point within the ternary diagram, with its coordinates denoting the ratios of its heat, power and cooling outputs. Thus, units producing two streams lie along the edges of the triangular field while those producing three streams fall inside it. Subsequently sizing of such process units that make up a trigeneration plant can be accomplished using lever-arm mixing rules within this triangular coordinate system. The use of the graphical methodology is illustrated with two case studies.

R.R. Tan

2014-01-01

449

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

450

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

451

Projecting onto Qubit Irreps of Young Diagrams  

CERN Document Server

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

452

Preliminary Master Logic Diagram for ITER operation  

International Nuclear Information System (INIS)

This paper describes the work performed to develop a Master Logic Diagram (MLD) for the operations phase of the International Thermonuclear Experimental Reactor (ITER). The MLD is a probabilistic risk assessment tool used to identify the broad set of potential initiating events that could lead to an offsite radioactive or toxic chemical release from the facility under study. The MLD described here is complementary to the failure modes and effects analyses (FMEAs) that have been performed for ITER's major plant systems in the engineering evaluation of the facility design. While the FMEAs are a bottom-up or component level approach, the MLD is a top-down or facility level approach to identifying the broad spectrum of potential events. Strengths of the MLD are that it analyzes the entire plant, depicts completeness in the accident initiator process, provides an independent method for identification, and can also identify potential system interactions. MLDs have been used successfully as a hazard analysis tool. This paper describes the process used for the ITER MLD to treat the variety of radiological and toxicological source terms present in the ITER design. One subtree of the nineteen page MLD is shown to illustrate the levels of the diagram

453

The Diagram as Story: Unfolding the Event-Structure of the Mathematical Diagram  

Science.gov (United States)

This paper explores the role of narrative in decoding diagrams. I focus on two fundamental facets of narrative: (1) the recounting of causally related sequences of events, and (2) the positioning of the narrator through point-of-view and voice. In the first two sections of the paper I discuss philosophical and semiotic frameworks for making sense…

de Freitas, Elizabeth

2012-01-01

454

Using Eye Tracking to Investigate Semantic and Spatial Representations of Scientific Diagrams During Text-Diagram Integration  

Science.gov (United States)

We investigated strategies used by readers when reading a science article with a diagram and assessed whether semantic and spatial representations were constructed while reading the diagram. Seventy-one undergraduate participants read a scientific article while tracking their eye movements and then completed a reading comprehension test. Our results showed that the text-diagram referencing strategy was commonly used. However, some readers adopted other reading strategies, such as reading the diagram or text first. We found all readers who had referred to the diagram spent roughly the same amount of time reading and performed equally well. However, some participants who ignored the diagram performed more poorly on questions that tested understanding of basic facts. This result indicates that dual coding theory may be a possible theory to explain the phenomenon. Eye movement patterns indicated that at least some readers had extracted semantic information of the scientific terms when first looking at the diagram. Readers who read the scientific terms on the diagram first tended to spend less time looking at the same terms in the text, which they read after. Besides, presented clear diagrams can help readers process both semantic and spatial information, thereby facilitating an overall understanding of the article. In addition, although text-first and diagram-first readers spent similar total reading time on the text and diagram parts of the article, respectively, text-first readers had significantly less number of saccades of text and diagram than diagram-first readers. This result might be explained as text-directed reading.

Jian, Yu-Cin; Wu, Chao-Jung

2015-02-01

455

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

2010-10-01

456

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

457

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.

2008-01-01

458

The position of brown dwarfs on the universal diagrams  

International Nuclear Information System (INIS)

The paper on the position of brown dwarf stars on a universal diagram was presented to the workshop on ''Astrophysics of brown dwarfs'', Virginia, USA, 1985. The two universal diagrams contain plots of various stellar objects (including brown dwarfs in terms of various physical quantities mass, entropy, luminosity and temperature). The author suggests that the entropy-mass diagram indicates that brown dwarfs could make a substantial contribution to the dark matter density in the solar vicinity. (U.K.)

459

Duals of Orphan-Free Anisotropic Voronoi Diagrams are Triangulations  

CERN Document Server

We show that, under mild conditions on the underlying metric, duals of appropriately defined anisotropic Voronoi diagrams are embedded triangulations. Furthermore, they always triangulate the convex hull of the vertices, and have other properties that parallel those of ordinary Delaunay triangulations. These results apply to the duals of anisotropic Voronoi diagrams of any set of vertices, so long as the diagram is orphan-free.

Canas, Guillermo D

2011-01-01

460

A Formal Model for Data Flow Diagram Rules  

OpenAIRE

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

461

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

2011-05-01

462

A Virtual Class Calculus  

DEFF Research Database (Denmark)

Virtual classes are class-valued attributes of objects. Like virtual methods, virtual classes are defined in an object's class and may be redefined within subclasses. They resemble inner classes, which are also defined within a class, but virtual classes are accessed through object instances, not as static components of a class. When used as types, virtual classes depend upon object identity - each object instance introduces a new family of virtual class types. Virtual classes support large scale program composition techniques, including higher-order hierarchies and family polymorphism. The original definition of virtual classes in BETA left open the question of static type safety, since some type errors were not caught until runtime. Later the languages Caesar and gbeta have used a more strict static analysis in order to ensure static type safety. However, the existence of a sound, statically typed model for virtual classes has been a long-standing open question. This paper presents a virtual class calculus,vc, that captures the essence of virtual classes in these full-fledged programming languages. The key contributions of the paper are a formalization of the dynamic and static semantics of vc and a proof of the soundness of vc.

Ernst, Erik; Ostermann, Klaus

2006-01-01

463

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

2010-04-01

464

Cu - Te and Cr - Te phase diagrams  

International Nuclear Information System (INIS)

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

465

Pseudobinary zircaloy-oxygen phase diagram  

International Nuclear Information System (INIS)

The zirconium-rich portion of the pseudobinary zircaloy-4/oxygen phase diagram was investigated by resistometric measurements and by metallographic analysis of equilibrated and quenched specimens. Accurate results for the phase-boundary locations were obtained from metallographic analysis of specimens in which oxidation and homogenization were limited to the ?-phase region, and the specimens were rapidly quenched from equilibration temperatures in the ?- and (? + ?)-phase regions. The ?- and ?-phase boundaries can be represented by the realtions ln Csub(?) = -2.28 + 0.535 ln (T - 1083) and ln Csub(?) = 5.02 - 8220/T (for T > 1280 or Csub(?)>0.2), where Csub(?) and Csub(?) are the oxygen concentrations in weight percent and T is temperature in K. (Auth.)

466

Bianchi I meets the Hubble diagram  

CERN Document Server

We improve existing fits of the Bianchi I metric to the Hubble diagram of supernovae and find an intriguing yet non-significant signal for anisotropy that should be verified or falsified in the near future by the Large Synoptic Survey Telescope. Since the literature contains two different formulas for the apparent luminosity as a function of time of flight in Bianchi I metrics, we present an independent derivation confirming the result by Saunders (1969). The present fit differs from earlier ones by Koivisto & Mota and by Campanelli et al. in that we use Saunders' formula, a larger sample of supernovae, Union 2 and JLA, and we use the general Bianchi I metric with three distinct eigenvalues.

Schucker, Thomas; Valent, Galliano

2014-01-01

467

Phase diagram of nondegenerate twisted mass fermions  

Science.gov (United States)

We determine the phase diagram and pion spectrum for Wilson and twisted-mass fermions in the presence of nondegeneracy between the up and down quarks and discretization errors, using Wilson and twisted-mass chiral perturbation theory. We find that the C P -violating phase of the continuum theory (which occurs for sufficiently large nondegeneracy) is continuously connected to the Aoki phase of the lattice theory with degenerate quarks. We show that discretization effects can, in some cases, push simulations with physical masses closer to either the C P -violating phase or another phase not present in the continuum, so that at sufficiently large lattice spacings physical-point simulations could lie in one of these phases.

Horkel, Derek P.; Sharpe, Stephen R.

2014-11-01

468

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

469

State diagram of Lu-Tl system  

International Nuclear Information System (INIS)

Using methods of DTA, X-ray phase analysis and metallography a phase equilibria diagram of Lu-Tl binary system is plotted. Existence of Lu5Tl3 and LuTl3 intermetallic cmpounds is substantiated. The earlier unknown LuTl and LuTl5 compounds are found. Lu5Tl3 compound melts congruently at 1720±15 K, the rost decmpose by peritectic reactions: LuTl at 1330±10 K, Lu3Tl5 at 935±5 K, LuTl3 at 910±5K. Two eutectic reactions are detected in a system. At 1425±10K and 13±1 at.% Tl eutectoid transformation takes place. Thallium limiting solubility in ?- and ?-Lu constituted 17±1 at.% at 1440 K and 6±1 at.% at 1425 K respectively

470

Basic primitives for molecular diagram sketching  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract A collection of primitive operations for molecular diagram sketching has been developed. These primitives compose a concise set of operations which can be used to construct publication-quality 2 D coordinates for molecular structures using a bare minimum of input bandwidth. The input requirements for each primitive consist of a small number of discrete choices, which means that these primitives can be used to form the basis of a user interface which does not require an accurate pointing device. This is particularly relevant to software designed for contemporary mobile platforms. The reduction of input bandwidth is accomplished by using algorithmic methods for anticipating probable geometries during the sketching process, and by intelligent use of template grafting. The algorithms and their uses are described in detail.

Clark Alex M

2010-10-01

471

Probing the QCD phase diagram with fluctuations  

CERN Document Server

The relevance of higher order cumulants of conserved charges for the analysis of freeze-out and critical conditions in heavy ion collisions at LHC and RHIC is discussed. Using properties of $O(4)$ scaling functions, the generic structure of these higher cumulants at vanishing baryon chemical potential is discussed. Chiral model calculations are then used to study their properties at non-zero baryon chemical potential. It is argued that the rapid variation of sixth and higher order cumulants at the phase boundary may be used to explore the QCD phase diagram in experiment. Moreover, results for the Polyakov loop susceptibilities in SU(3) lattice gauge theory as well as in (2+1) flavor lattice QCD are discussed. An analysis of the ratios of susceptibilities indicates that the deconfinement transition is reflected in characteristic modifications of these ratios.

Friman, Bengt

2014-01-01

472

Recent results in Ring Diagram analysis  

CERN Document Server

The ring-diagram technique was developed by Frank Hill 25 years ago and developed quickly during the late 1990s. It is nowadays one of the most commonly used techniques in local helioseismology. The method consists in the power spectral analysis of solar acoustic oscillations on small regions (2 to 30 degrees) of the solar surface. The power spectrum resembles a set of trumpets nested inside each other and, for a given frequency, it looks like a ring, hence the technique's name. It provides information on the horizontal flow field and thermodynamic structure in the layers immediately below the photosphere. With data regularly provided by MDI (on board SOHO), GONG+ network and more recently HMI (on SDO), many important results have been achieved. In recently years, these results include estimations of the meridional circulation and its evolution with solar cycle; flows associated with active regions, as well as, flow divergence and vorticity; and thermal structure beneath and around active regions. Much progre...

Rabello-Soares, M Cristina

2013-01-01

473

REPRESENTING MARKOV CHAINS WITH TRANSITION DIAGRAMS  

Directory of Open Access Journals (Sweden)

Full Text Available Stochastic processes have many useful applications and are taught in several university programmes. Students often encounter difficulties in learning stochastic processes and Markov chains, in particular. In this article we describe a teaching strategy that uses transition diagrams to represent a Markov chain and to re-define properties of its states in simple terms of directed graphs. This strategy utilises the studentsâ?? intuition and makes the learning of complex concepts about Markov chains faster and easier. The method is illustrated by worked examples. The described strategy helps students to master properties of finite Markov chains, so they have a solid basis for the study of infinite Markov chains and other stochastic processes.

Farida Kachapova

2013-01-01

474

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

475

Results in using the new version of the SDL-UML profile: Presentation held at Joint ITU-T and SDL Forum Society Workshop on "ITU System Design Languages", Geneva, Switzerland, 15 - 16 September 2008  

OpenAIRE

In the last two decades the Specification and Description Language (SDL) has been established in the telecommunication sector as a domainspecific modeling language. A disadvantage of SDL is the fact that only a small number of modeling tools for SDL is available. Another graphical modelling language is the Unified Modeling Language (UML) used for the model-based development of software systems. Due to the extensibility mechanisms of UML, this language is not only restricted to the software se...

Kraas, A.; Rehm, P.

2008-01-01

476

Leak before break piping evaluation diagram  

International Nuclear Information System (INIS)

Traditionally Leak Before Break (LBB) has been applied to the evaluation of piping in existing nuclear plants. This paper presents a simple method for evaluating piping systems for LBB during the design process. This method produces a piping evaluation diagram (PED) which defines the LBB requirements to the piping designer for use during the design process. Several sets of LBB analyses are performed for each different pipe size and material considered in the LBB application. The results of this method are independent of the actual pipe routing. Two complete LBB evaluations are performed to determine the maximum allowable stability load, one evaluation for a low normal operating load, and the other evaluation for a high normal operating load. These normal operating loads span the typical loads for the particular system being evaluated. In developing the allowable loads, the appropriate LBB margins are included in the PED preparation. The resulting LBB solutions are plotted as a set of allowable curves for the maximum design basis load, such is the seismic load versus the normal operating load. Since the required margins are already accounted for in the LBB PED, the piping designer can use the diagram directly with the results of the piping analysis and determine immediately if the current piping arrangement passes LBB. Since the LBB PED is independent of pipe routing, changes to the piping system can be evaluated using the existing PED. For a particular application, alting PED. For a particular application, all that remains is to confirm that the actual materials and pipe sizes assumed in creating the particular design are built into the plant

477

Logical diagrams in Serbian medieval manuscripts  

Directory of Open Access Journals (Sweden)

Full Text Available Visual rendering of logical relations represent an interesting, although (so far completely neglected part of Serbian medieval philosophy. The attempts to visualize conceptual connections or differences must not be viewed as sheer illustrations, let alone purely decorative ornaments, but as vivid traces of a deeper intellectual striving to gain more insight into the subject by means of certain pictorial shapes or accompanying scholia. Roughly speaking, Serbian diagrams occur in three major forms: 1 Divisions (dichotomous, trichotomous, etc representing conceptual classifications in the manner of the Porphyrian tree or its parts, 2 Reversed arches with one, two or more salient points, viz., upright or upside down triangles denoting syllogisms according to the three recognized figures and their respective aberrations (par