Showing papers in "Information Technology in 2008"

An Introduction to Service Choreographies

Abstract: Service oriented architecture (SOA) is an architectural style for building software systems based on services. Especially in those scenarios where services implement business processes, complex conversations between the services occur. Service choreographies are a means to capture all interaction obligations and constraints from a global perspective. This article introduces choreographies as an important artifact for SOA, compares them to service orchestrations and surveys existing languages for modeling them.

An Introduction to Service Choreographies (Servicechoreographien – eine Einführung)

Abstract: Service oriented architecture (SOA) is an architectural style for building software systems based on services. Especially in those scenarios where services implement business processes, complex conversations between the services occur. Service choreographies are a means to capture all interaction obligations and constraints from a global perspective. This article introduces choreographies as an important artifact for SOA, compares them to service orchestrations and surveys existing languages for modeling them.

Services and Service Composition - An Introduction Services und Service Komposition - Eine Einführung

Abstract: Summary In this overview paper, we discuss the basic principles underlying service-oriented computing in general, and (Web) services in particular. We discuss the important differences between (Web) services and Web applications and other models in Internet computing. Finally, we discuss where we see the future research challenges in the area of service composition. Zusammenfassung In diesem Ubersichtsartikel behandeln wir die Grundlagen von Service-oriented Computing und (Web) Services im Speziellen. Wir besprechen die wesentlichen Unterschiede zwischen (Web) Services und Web Applikationen sowie weiteren Modellen im Bereich des Internet Computing. Im letzten Teil des Artikels besprechen wir die zukunftigen Herausforderungen im Bereich der Service Composition Forschung.

Die Rolle von Features und Aspekten in der Softwareentwicklung The Role of Features and Aspects in Software Development

Abstract: KEYWORDS D.1 [Software: Programming Techniques], D.2 [Software: Software Engineering], D.3.3 [Software: Programming Languages: Language Constructs and Features] Feature-orientierte Programmierung; Aspekt-orientierte Programmierung, Aspekt-basierte Featuremodule, Aspektverfeinerung, Softwareproduktlinien, schrittweise Verfeinerung / feature-oriented programming, aspect-oriented programming, aspectual feature modules, aspect refinement, software product lines, stepwise refinement

Scalable Data Dissemination for Inter-Vehicle-Communication: Aggregation versus Peer-to-Peer (Skalierbare Informationsverbreitung für die Fahrzeug-Fahrzeug-Kommunikation: Aggregation versus Peer-to-Peer)

Abstract: Summary This paper investigates the scalable dissemination of data between vehicles. The application context of this work is traffic information systems where cars are not only consumers but also producers of information. The key challenge in those systems is to ensure scalability in an environment where data is provided and requested by all participating vehicles in a large area. We discuss two fundamentally different approaches to this problem: using direct communication between cars and compressing the data via aggregation versus relying on infrastructure. The latter approach can further be divided into client-server and peer-to-peer systems. We outline all three approaches and highlight their advantages and disadvantages. Zusammenfassung Im Rahmen dieses Beitrages wird die Verbreitung von Informationen zwischen Fahrzeugen untersucht. Im Vordergrund stehen dabei Verkehrsinformationssysteme, bei denen Fahrzeuge sowohl Produzenten als auch Konsumenten von Informationen sind. Die zentrale Herausforderung solcher Systeme ist ihre Skalierbarkeit. Wir stellen hier zwei fundamental verschiedene Herangehensweisen vor: Einerseits die direkte Kommunikation zwischen Fahrzeugen, andererseits den Einsatz von Infrastruktur für den Nachrichtenaustausch zwischen Fahrzeugen. Letzeres kann weiter in Client-Server- und Peer-to-Peer-Ansätze unterteilt werden. In diesem Artikel geben wir Beispiele für alle drei Ansätze und untersuchen diese hinsichtlich ihrer Vor- und Nachteile.

Design of multi-path radio echo cancellation system in digital on-channel repeater for DAB

Abstract: The design of multi-path radio echo cancellation system in digital on-channel repeater for DAB could deal with problems that can not be solved only by antenna isolation.Based on the limitation of designing hardware with LMS algorithm,an improved DLMS algorithm which is suitable for the high speed real time signal processing is put forward in this paper,and it is implemented with Xilinx Virtex-4FPGA.

Sharing Memories of Smart Products and their Consumers in Instrumented Environments (Austausch digitaler Gedächtnisse von Produkten und Konsumenten in instrumentierten Umgebungen)

Abstract: Summary Intelligent assistants need precise knowledge about activity sequences and the habits of their users so as to support them in an adequate manner. The following contribution addresses an approach to user support, which takes advantage of the object centred nature of many day-to-day activities. By means of application examples from the everyday, we illustrate how a combination of smart items and digital memories allows for realizing innovative support mechanisms, which take into account static knowledge about objects as well as situational observations and historical data. Here, we devote special attention to applications originating from the sharing of data gathered this way between users and systems. Zusammenfassung Intelligente Assistenten benötigen präzises Wissen über Handlungsabläufe und Gewohnheiten ihres Benutzers, um diesen in adäquater Weise unterstützen zu können. Der folgende Beitrag behandelt einen Ansatz zur Benutzerunterstützung, der sich die objektzentrierte Natur vieler Alltagshandlungen zu Nutze macht. Wir illustrieren anhand von Anwendungsbeispielen, wie durch die Kombination von Smart Items und digitalen Gedächtnissen innovative Formen der Benutzerunterstützung möglich werden, die statisches Wissen über Objekte mit dynamischen Informationen und historischen Daten kombinieren. Besondere Aufmerksamkeit widmen wir hierbei Anwendungsmöglichkeiten, die aus dem Austausch der so gewonnenen Daten zwischen Benutzern und Systemen entstehen.

Quality of Service in SOA Environments. An Overview and Research Agenda (Quality of Service in SOA-Umgebungen)

Abstract: Summary Interoperability and componentization are the two defining characteristics of Service Oriented Architectures (SOA). From a middleware perspective this means standardized quality of service (QoS) protocols and QoS-rich service descriptions. This paper provides an architectural overview of quality of service issues in SOA environments and a review of open problems and current research directions. Zusammenfassung Interoperabilität und Komponentenorientierung sind zwei definierende Eigenschaften Service-orientierter Architekturen (SOA). Aus Sicht der Middleware benötigt man dazu standardisierte Unterstützung für Quality of Service (QoS) in Protokollen und Servicebeschreibungen. Dieser Beitrag gibt eine Einführung in QoS-Aspekte von SOA-Umgebungen und einen Überblick über offene Probleme und aktuelle Forschungsfragen.

SVM multi-class classification based on binary tree

Abstract: The problems and defections of the existing methods of SVM multi-class classification were analyzedA multi-class classification method based on binary tree using class distance was put forward

Einsatz eines Physikmodells zur Simulation des Materialflusses einer Produktionsanlage (Application of a Physical Model for the Simulation of the Material Flow of a Manufacturing Plant)

Abstract: Zusammenfassung Die Idee der virtuellen Inbetriebnahme wird von Werkzeugmaschinen auf materialflussintensive Produktionsanlagen übertragen. Dabei zeigt sich, dass der Materialfluss für die Aussagekraft der Simulation wesentlich ist. Ausgehend vom CAD-Modell wird ein reduziertes Geometriemodell um ein Physik- und Kinematikmodell erweitert. Auf Basis dieses Modells wird die Simulation für die virtuelle Inbetriebnahme durchgeführt. Anhand eines realitätsnahen Anwendungsszenarios wird die praktische Nutzbarkeit gezeigt. Summary The idea of virtual commissioning is being transferred from machine tools to material flow intensive manufacturing plants. It shows that the material flow is a key component for the significance of the simulation. Based on the CAD model a reduced geometry model is enhanced by a physical and kinematic model. This model is the input for the simulation. The practicability is shown on the basis of a simple but close to reality example of a part of a manufacturing plant.

Study on feature selection in text categorization

Abstract: This paper firstly makes a brief introduction about MI,IG,x2statistic and expected cross entropy.Then combining with KNN classification algorithm,it assesses the four methods of feature selection by recall,precision,macro-averaging and micro-averaging.At last,this paper proposes and discusses the two methods of improving MI.

Research on image retrieval based on color feature

Abstract: This article analyzed the characteristics of color,described the choice of the color space,the quantization of color and the similarity of color.It discussed and compared the main methods and improved methods of image retrieval based on color feature such as the histogram intersection method,the main color expressed method,the method based on reference color table and the method,based on the regional color.

Service Oriented Architecture – Overview of Technologies and Standards

Abstract: In constantly changing and dynamic markets enterprises are in an even greater need to maintain adequate IT support for their core competencies. This support requires integrating heterogeneous systems and applications that are built using different technologies and infrastructures, which hamper interoperability and seamless integration. The problems are aggravated additionally by the need to cross enterprise boundaries and the necessity to react to changes in that same environment in an ad-hoc manner. Service-oriented computing (SOC) provides a powerful abstraction basically allowing to perceiving all compute resources as entities that can be dynamically discovered and composed. These entities are called services in SOC: a service is exposed for use over a network, and it is always ready for use. Services are described in terms of interfaces specifying service functionality independent of platform technology or programming language used. This renders the service abstraction particularly advantageous when applied for tackling problems due to heterogeneity of IT landscapes. Service oriented architecture (SOA) is the accompanying architectural style. The roles in the SOA are: service provider, service consumers and service registry. Applications compliant with the SOA can be implemented in terms of various technologies and programming languages. Services communicate through messaging and are loosely coupled. The single technology that has been created to implement SOA inherently and from its onset is the Web service technology. It provides an abstract component model for representing and using services. Based on the heterogeneity and interoperability problems to solve, this technology is highly dependent on standardization; it enables reuse of legacy applications and aims at solving integration problems. The Web Service technology defines a stack of composable specification addressing orthogonal concerns that can be easily composed to meet the requirements of various application domains. Web services are the only service-oriented technology that has enjoyed a tremendous success in acceptance by industry and academia. The implication of its composable nature is that the execution infrastructure for service-oriented applications must support that composability of protocols. Web services mainly target machine-to-machine interaction, which is driven by the need to enable high degree of automation. The execution infrastructure for such applications is referred to as (Enterprise) Service Bus (ESB). It is a piece of middleware enabling the application of the concepts of service orientation. The papers in this issue of it give an overview of the most important aspects of SOA from the point of view of both, industry and academia. The paper of Dustdar and Papazoglou provides definitions of what services and composite services are and illustrates the basic principles of service-oriented computing and how they are reflected by the Web service technology. The distinguishing differences between Web services and other programming models are discussed. This overview paper compares the provision of enterprise solutions using the application service provider (ASP) model and the service-oriented computing approach, whereas the major benefit of services is revealed by their

Autonomes Fahren – Erkenntnisse aus der DARPA Urban Challenge (Autonomous Driving – Insights from the DARPA Urban Challenge)

Abstract: Zusammenfassung Mit der Urban Challenge hat die DARPA Ende 2007 ihr erklärtes Ziel erreicht, nachzuweisen, dass autonomes Fahren prinzipiell möglich ist. In diesem Artikel wird skizziert, welcher Stand tatsächlich erreicht wurde und welche Herausforderungen nun bearbeitet werden wollen. Summary Late in 2007, DARPA has conducted the Urban Challenge and achieved its declared goal, that autonomous driving is possible in principle. In this article, we discuss how far we actually are and what the next challenges will be.

Research on information fusion

Abstract: The inchoation of information fusion is discussed in this paper,its application is also introduced and the problem is given out.Finally,the progress and trend of information fusion technology are outlined.

Research on an improved Chinese segmentation algorithm based on word frequency statistic

Abstract: This paper mainly analyzes the principle and characteristics of traditional FMM algorithm.And it introduces an improved FMM algorithm,which is expected to improve the efficiency of Chinese word segmentation.

Zellulare Transportsysteme – Den Dingen Beine machen im „Internet der Dinge” (Cellular Transport Systems – Making Things Move in the “Internet of Things”)

Abstract: Zusammenfassung Hochautomatisierte intralogistische Systeme sind ein in der Anwendung befindliches Domänenbeispiel intelligenter Umgebungen. Ausgehend vom Status Quo in der Kommissionierung über den Einsatz von Agenten- und RFID-Technologien, die Multiagentensimulation und die Entwicklung von intelligenten Behältern wird konsequent der Weg hin zur vollkommen autonomen Gestaltung des Materialflusses im Konzept der zellularen Transportsysteme aufgezeigt. Summary Highly automised intralogistic systems are an example of domains in intelligent environments. Based on the state of the art of intralogistic order-picking this article describes the use of agent and RFID technologies, the multi-agent simulation und the development of smart boxes, leading consequently to a completely autonomous design of the material flow within cellular transport systems.

Research on the chaotic time series decision method

Abstract: Before extracting the chaotic characteristic of the time series,it is needed to consider whether this time series have the chaos.If it is assumed that the experimental data is chaotic without examination in advance and the reconstruction phase space theory is used directly to extract the time series characteristics to build the model and the forecast,the result will be incredible.The chaotic system usually can be identified by the existence of chaotic attractors.Around this characteristics,this paper discussed the chaotic time series decision method.

Design and realization of genetic-neural network based on MATLAB

Abstract: This paper introduces genetic-neural network,and a method using the MATLAB tool kit to design genetic-neural network is introducedMoreover the key issues of network's realization,which include designing network architecture,selecting learning regulation,evolutionary training weight and threshold are illustrated in detailThe application example is given outIt can be easily that creating a network,training a network and simulating a network with MATLAB languageThe efficiency of genetic-meural metwork is showed with comparing the BP neural network with genetic-neural network

Effiziente Methoden zum Lösen von 3D-Puzzle-Problemen* (Efficient Methods for Solving 3D-Puzzle-Problems)

Abstract: Zusammenfassung Das Zusammenfügen von 3D-Objekten aus Einzelteilen (3D-Puzzle-Problem) ist in vielen Bereichen von hoher Relevanz. Anwendungen finden sich beispielsweise in der Archäologie (Rekonstruktion von Artefakten), der Chirurgie (Richten von Knochenfrakturen), sowie der Bioinformatik (Protein-Docking) und Robotik (Fügen von Bauteilen). Dieser Artikel gibt einen Überblick über die Verfahren und erzielten Ergebnisse der Dissertation “Das 3D-Puzzle-Problem”, in der die gesamte Prozesskette von der Datenakquisition, über die allgemeine Registrierung von Oberflächen, bis hin zu speziellen Anwendungsfällen des 3D-Puzzle-Problems behandelt wird. Insbesondere werden neue Ansätze vorgestellt, mit denen Fragmente auf äußerst effiziente Weise und ohne Wissen über eine Initiallösung automatisch zusammengefügt werden können. Hierbei wird eine hohe Robustheit gegenüber Messungenauigkeiten, Fragmentschädigungen und Materialverschleiß erreicht. Darüber hinaus gelingt es, durch Ausnutzung von Symmetrieebenen und Achsen gebrochene Oberschenkel- und Beckenknochen virtuell zusammenzufügen und somit einen wichtigen Baustein für die computerassistierte Frakturbehandlung in der Chirurgie zu schaffen. Summary The reconstruction of 3D fragmented objects (3D-puzzle-problem) is a highly relevant task with many applications. The field of applications comprises archaeology (reconstruction of broken artefacts), surgery (fracture reduction), bioinformatics (proteindocking) and robotics (assemblage of components). This work provides an overview of the approaches and results of the thesis “Das 3D-Puzzle-Problem”, which considers the whole processing chain, starting from data acquisition, the general registration of surfaces, up to special applications. In this context, novel and efficient approaches will be introduced. They automatically assemble fragments without any knowledge of an initial pose and are highly robust against measurement inaccuracies, material deterioration and noise. Furthermore, it is shown how a priori knowledge of the broken objects, like mirror symmetries and axes, can be used to reconstruct broken femora (thigh bones) and pelvis fractures, which is an important building block for computer-assisted fracture reduction in surgery.

Method and implementation of GIS secondary development

Abstract: The paper introduces three methods of GIS secondary development,they are independent secondary development,simple secondary development and integrated secondary development. Then it compares the advantages and disadvantages of each method. Using ArcObjects component library and MapControl controls and Scene Viewer Control controls provided by ESRI company,this paper makes secondary development of GIS under ArcGIS8.3 environment based on VisualC+ +6.0.

Ambient Intelligence – The New Paradigm for Computer Science and for Information Technology (Ambient Intelligence – Das neue Paradigma der Informatik und der Informationstechnologie)

Abstract: Ambient Intelligence (AmI) refers to the fact that through technological innovation the environments in which we live and work are becoming more and more intelligent. This is based on the integration of advanced electronics into these environments. People, animals, machines, objects, etc. interact with their environment. This interaction is seamless, trustworthy and natural. The result of this is a completely new set of products (handheld devices, displays, wearables, etc.) and services (for example for health-care, ambient-assisted living, for sports and leisure, for travel, for edutainment and creativity and others). AmI has several requirements on the underlying software architecture; the most important are • Ubiquity: The system should be integrated inconspicuously in the environment of the user. • Interoperability: The different devices and the different environments have to jointly communicate and cooperate. • Autonomy: A system has to be autonomous and reactive. • Dynamic: An ensemble has to be extensible by new devices. • User centered: The user (or the “Smart Player”) is in the center not the devices.

Information-theoretical security secret key agreement protocol

Abstract: Information-theoretical security secret key agreement protocol has become hot in recent yearsQKD could also be included into itIf people thoroughly understand it,they can know more about QKD from a higher levelIt also reveals the security and limitations of the way using classical key distributionThis paper summarizes the all points in the information-theoretical security secret key agreement protocol(ITSSKP)

Semantic Execution Environments for Semantics-Enabled SOA (Ausführungsumgebungen für eine um Semantik erweiterte SOA)

Abstract: Summary Much recent work in SOA has concentrated on documenting reference architectures. In this paper we present on-going work on the establishment of such an architecture within the OASIS SEE TC, detailing how the benefits of semantic Web services can be applied to SOA and the role of semantic execution environments, such as the IRS and WSMX. Zusammenfassung Viel Arbeit im Bereich SOA hat sich in letzter Zeit darauf konzentriert, Referenzarchitekturen zu dokumentieren. Hier zeigen wir die momentane Arbeit an der Aufstellung einer Referenzarchitektur innerhalb des OASIS SEE TC. Detailliert stellen wir den Nutzen von semantischen Web Services für SOA sowie die Rolle von semantischen Ausführungsumgebungen wie das IRS und WSMX dar.

Regression forecast model of support vector machine based on principal component analysis

Abstract: Based on principal component analysis method,dimensions of samples are reduced,multiple regression forecast model is established based on principal component,coefficient of regression model is confirmed by using support vector machine,finally the example showed this model has higher forecast precision.

Long term evolution of 3GPP and its physical layer technologies

Abstract: The long term evolution(LTE) program of 3GPP is the biggest research program launched in recent years.It has achieved many great progresses since it has been initiated in 2004.3GPP LTE has fulfilled the high data rate,low latency and all-packet basis.This paper introduced its design objectives for E3G system service capabilities and the advanced technologies and novel concepts related to the physical layer in LTE program.

Ambient intelligence: basic elements and insights

Abstract: Ambient Intelligence (AmI) is about smart everyday technology that makes sense. The concept refers to electronic environments that are sensitive and responsive to the presence of people. The paradigm relates to a vision on digital systems for the years 2010–2020 which was developed in the late nineties of the past century, and which has become quite influential worldwide in the development of new concepts for information processing. The novel and disruptive element of the vision is that it combines in a unique way elements from multi-disciplinary fields such as electrical engineering, computer science, industrial design, user interfaces, and cognitive sciences into highly integrated systems by a user-centered design approach.