The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform

Shujun Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Feature Article Domain Configuration and piezoelectric properties of (K0.50Na0.50)1−xLix(Nb0.80Ta 0.20)O3 ceramics
    2020
    Co-Authors: Jialiang Zhang, Chunlei Wang, Shujun Zhang
    Abstract:

    Domain structure plays an important role in determining piezoelectric properties of ferroelectric materials. However, limited studies have been carried out on the Domains of (K,Na)NbO3-based lead free ceramics. The Domain Configuration, Domain reversal behavior and piezoelectric properties of (K0.50Na0.50)1−xLix(Nb0.80Ta 0.20)O3 (KNN-Lix) ceramics with x = 0.02, 0.035 and 0.05, were studied in this research. It was observed that ceramics with different phases show distinctly different Domain Configurations and Domain reversal behaviors. When compared to other two compositions, x = 0.035 with coexistent orthorhombic-tetragonal phases at room temperature was found to possess curved Domain stripes and larger average Domain width, leading to optimal piezoelectric properties with d33* = 260 pm/V and kp = 48%. Based on the microstructures, polarization hysteresis loops and unipolar strain curves under high electric field, it was concluded that the larger Domain size and easier Domain switching are due to the coexistence of orthorhombic and tetragonal phases, account for the improved properties in KNNT-Li0.035 ceramics. © 2014 Elsevier Ltd. All rights reserved.

  • Domain Configuration and piezoelectric properties of k0 50na0 50 1 xlix nb0 80ta0 20 o3 ceramics
    Journal of The European Ceramic Society, 2014
    Co-Authors: Jialiang Zhang, Chunlei Wang, Shujun Zhang
    Abstract:

    Abstract Domain structure plays an important role in determining piezoelectric properties of ferroelectric materials. However, limited studies have been carried out on the Domains of (K,Na)NbO 3 -based lead free ceramics. The Domain Configuration, Domain reversal behavior and piezoelectric properties of (K 0.50 Na 0.50 ) 1− x Li x (Nb 0.80 Ta 0.20 )O 3 (KNN-Li x ) ceramics with x  = 0.02, 0.035 and 0.05, were studied in this research. It was observed that ceramics with different phases show distinctly different Domain Configurations and Domain reversal behaviors. When compared to other two compositions, x  = 0.035 with coexistent orthorhombic-tetragonal phases at room temperature was found to possess curved Domain stripes and larger average Domain width, leading to optimal piezoelectric properties with d 33 * = 260 pm/V and k p  = 48%. Based on the microstructures, polarization hysteresis loops and unipolar strain curves under high electric field, it was concluded that the larger Domain size and easier Domain switching are due to the coexistence of orthorhombic and tetragonal phases, account for the improved properties in KNNT-Li 0.035 ceramics.

Alexander Felfernig - One of the best experts on this subject based on the ideXlab platform.

  • AID - Web-based Configuration of Virtual Private Networks with Multiple Suppliers
    Artificial Intelligence in Design ’02, 2020
    Co-Authors: Alexander Felfernig, Gerhard Friedrich, Dietmar Jannach, Markus Zanker
    Abstract:

    An Internet-based Virtual Private Network (IP-VPN) uses the open, distributed infrastructure of the Internet to transmit data between corporate sites. The Configuration (network design) for a specific customer network typically requires the selection of network access lines and backbone sections that are provisioned by different organizations in a supply chain. Moreover, when configuring such a network, the given customer requirements (e.g., minimal bandwidth) have to be observed. Within this paper, we show how the (sales-) Configuration process for these networks is supported within a framework for distributed Configuration. Beside the implementation of an adequate distributed problem solving mechanism based on Constraint Satisfaction with commercial tools, we address the problem of supplier selection and knowledge integration in a Web-based environment for eCommerce: Based on common ontological commitments on representation concepts for the Configuration Domain, the suppliers can advertise their products and services, whereby the distributed problem solving process involves locating and executing the supplier’s Configuration service using an open XML-based protocol. We present the architecture of the implemented prototype framework and show the relation of our work to emerging approaches in the fields of Distributed Problem Solving and Semantic Web Services.

  • Exploiting Structural abstractions for consistency based diagnosis of large configurator knowledge bases
    2020
    Co-Authors: Alexander Felfernig, Gerhard Friedrich, Dietmar Jannach, Markus Stumptner
    Abstract:

    Debugging, validation, and maintenance of configurator knowledge bases are important tasks for the successful deployment of product Configuration systems, due to frequent changes (e.g., new component types, new regulations) in the configurable products. Model based diagnosis techniques have shown to be a promising approach to support the test engineer in identifying faulty parts in declarative knowledge bases. Given positive (existing Configurations) and negative test cases, explanations for the unexpected behavior of the Configuration systems can be calculated using a consistency based approach. For the case of large and complex knowledge bases, we show how the usage of hierarchical abstractions can reduce the computation times for the explanations and in addition gives the possibility to iteratively and interactively refine diagnoses from abstract to more detailed levels. Starting from a logical definition of Configuration and diagnosis of knowledge bases, we show how a basic diagnostic algorithm can be extended to support hierarchical abstractions in the Configuration Domain. Finally, experimental results from a prototypical implementation using an industrial constraint based configurator library are presented.

  • Standardized Configuration Knowledge Representations as Technological Foundation for Mass Customization
    IEEE Transactions on Engineering Management, 2007
    Co-Authors: Alexander Felfernig
    Abstract:

    The effective integration of Configuration system development with industrial software development is crucial for a successful implementation of a mass customization strategy. On the one hand, Configuration knowledge bases must be easy to develop and maintain due to continuously changing product assortments. On the other hand, flexible integrations into existing enterprise applications, e-marketplaces and different facets of supply chain settings must be supported. This paper shows how the model-driven architecture (MDA) as an industrial framework for model development and interchange can serve as a foundation for standardized Configuration knowledge representation, thus enabling knowledge sharing in heterogeneous environments. Using UML/Object Constraint Language as standard Configuration knowledge representation languages, the representation of Configuration Domain-specific modeling concepts within MDA is shown and a formal semantics for these concepts is provided which allows a common understanding and interpretation of Configuration task descriptions

  • Consistency-based diagnosis of Configuration knowledge bases
    Artificial Intelligence, 2004
    Co-Authors: Alexander Felfernig, Gerhard Friedrich, Dietmar Jannach, Markus Stumptner
    Abstract:

    Configuration problems are a thriving application area for declarative knowledge representation that currently experiences a constant increase in size and complexity of knowledge bases. Automated support of the debugging process of such knowledge bases is a necessary prerequisite for effective development of configurators. We show that this task can be achieved by consistency-based diagnosis techniques. Based on the formal definition of consistency-based Configuration we develop a framework suitable for diagnosing Configuration knowledge bases. During the test phase of configurators, valid and invalid examples are used to test the correctness of the system. In case such examples lead to unintended results, debugging of the knowledge base is initiated. Starting from a clear definition of diagnosis in the Configuration Domain we develop an algorithm based on conflicts. Our framework is general enough for its adaptation to diagnosing customer requirements to identify unachievable conditions during Configuration sessions.A prototype implementation using commercial constraint-based configurator libraries shows the feasibility of diagnosis within the tight time bounds of interactive debugging sessions. Finally, we discuss the usefulness of the outcomes of the diagnostic process in different scenarios.

  • UML - Configuration Knowledge Representation Using UML/OCL
    Lecture Notes in Computer Science, 2002
    Co-Authors: Alexander Felfernig, Gerhard Friedrich, Dietmar Jannach, Markus Zanker
    Abstract:

    Today's economy is exhibiting a growing trend towards highly specialized solution providers cooperatively offering configurable products and services to their customers. In this context, knowledge based configurators which support the Configuration of complex products and services, must be enhanced with capabilities of knowledge sharing and distributed Configuration problem solving. In this paper we demonstrate how UML/OCL can be used as knowledge representation language supporting standardized knowledge interchange thus enabling cooperative problem solving by different Configuration environments. We show the representation of Configuration Domain specific types of constraints in OCL and present an OCL based knowledge acquisition workbench which enables Configuration knowledge base development, maintenance and interchange.

Markus Zanker - One of the best experts on this subject based on the ideXlab platform.

  • AID - Web-based Configuration of Virtual Private Networks with Multiple Suppliers
    Artificial Intelligence in Design ’02, 2020
    Co-Authors: Alexander Felfernig, Gerhard Friedrich, Dietmar Jannach, Markus Zanker
    Abstract:

    An Internet-based Virtual Private Network (IP-VPN) uses the open, distributed infrastructure of the Internet to transmit data between corporate sites. The Configuration (network design) for a specific customer network typically requires the selection of network access lines and backbone sections that are provisioned by different organizations in a supply chain. Moreover, when configuring such a network, the given customer requirements (e.g., minimal bandwidth) have to be observed. Within this paper, we show how the (sales-) Configuration process for these networks is supported within a framework for distributed Configuration. Beside the implementation of an adequate distributed problem solving mechanism based on Constraint Satisfaction with commercial tools, we address the problem of supplier selection and knowledge integration in a Web-based environment for eCommerce: Based on common ontological commitments on representation concepts for the Configuration Domain, the suppliers can advertise their products and services, whereby the distributed problem solving process involves locating and executing the supplier’s Configuration service using an open XML-based protocol. We present the architecture of the implemented prototype framework and show the relation of our work to emerging approaches in the fields of Distributed Problem Solving and Semantic Web Services.

  • UML - Configuration Knowledge Representation Using UML/OCL
    Lecture Notes in Computer Science, 2002
    Co-Authors: Alexander Felfernig, Gerhard Friedrich, Dietmar Jannach, Markus Zanker
    Abstract:

    Today's economy is exhibiting a growing trend towards highly specialized solution providers cooperatively offering configurable products and services to their customers. In this context, knowledge based configurators which support the Configuration of complex products and services, must be enhanced with capabilities of knowledge sharing and distributed Configuration problem solving. In this paper we demonstrate how UML/OCL can be used as knowledge representation language supporting standardized knowledge interchange thus enabling cooperative problem solving by different Configuration environments. We show the representation of Configuration Domain specific types of constraints in OCL and present an OCL based knowledge acquisition workbench which enables Configuration knowledge base development, maintenance and interchange.

  • Cooperating Configuration agents supporting supply chain integration of customizable products
    Proceedings Fourth International Conference on MultiAgent Systems, 2000
    Co-Authors: Alexander Felfernig, Gerhard Friedrich, Dietmar Jannach, Markus Zanker
    Abstract:

    The integration of Configuration systems for supporting the supply-chain management of configurable products and services is still an open research issue. Current configurator approaches are designed for solving local Configuration problems, but there is still no support for the integration of different Configuration systems. In order to facilitate cooperative Configuration, we employ Configuration agents that are capable of managing requests and posting Configuration subtasks to remote agents. For integrating the different knowledge representation formalisms of the Configuration agents, we construct common ontologies by employing broadly-used Configuration Domain-specific modelling concepts.

  • ICMAS - Cooperating Configuration agents supporting supply chain integration of customizable products
    Proceedings Fourth International Conference on MultiAgent Systems, 2000
    Co-Authors: Alexander Felfernig, Gerhard Friedrich, Dietmar Jannach, Markus Zanker
    Abstract:

    The integration of Configuration systems for supporting the supply-chain management of configurable products and services is still an open research issue. Current configurator approaches are designed for solving local Configuration problems, but there is still no support for the integration of different Configuration systems. In order to facilitate cooperative Configuration, we employ Configuration agents that are capable of managing requests and posting Configuration subtasks to remote agents. For integrating the different knowledge representation formalisms of the Configuration agents, we construct common ontologies by employing broadly-used Configuration Domain-specific modelling concepts.

  • IEA/AIE - A framework for the development of cooperative Configuration agents
    Intelligent Problem Solving. Methodologies and Approaches, 2000
    Co-Authors: Alexander Felfernig, Gerhard Friedrich, Dietmar Jannach, Markus Zanker
    Abstract:

    The integration of Configuration systems to support supply chain integration of configurable products is still an open research issue. Current configurator approaches are designed for solving local Configuration problems but there is no support for the integration of multiple Configuration systems. In order to facilitate distributed Configuration of customizable products we employ cooperating Configuration agents capable of managing requests and posting Configuration subtasks to remote Configuration agents. For integrating different knowledge representation formalisms of Configuration agents we apply broadly used Configuration Domain specific modeling concepts to design shareable ontologies which can be interpreted by other agents. These concepts are defined as UML (Unified Modeling Language) stereotypes which can be automatically translated into a Configuration agent's knowledge representation.

Jialiang Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Feature Article Domain Configuration and piezoelectric properties of (K0.50Na0.50)1−xLix(Nb0.80Ta 0.20)O3 ceramics
    2020
    Co-Authors: Jialiang Zhang, Chunlei Wang, Shujun Zhang
    Abstract:

    Domain structure plays an important role in determining piezoelectric properties of ferroelectric materials. However, limited studies have been carried out on the Domains of (K,Na)NbO3-based lead free ceramics. The Domain Configuration, Domain reversal behavior and piezoelectric properties of (K0.50Na0.50)1−xLix(Nb0.80Ta 0.20)O3 (KNN-Lix) ceramics with x = 0.02, 0.035 and 0.05, were studied in this research. It was observed that ceramics with different phases show distinctly different Domain Configurations and Domain reversal behaviors. When compared to other two compositions, x = 0.035 with coexistent orthorhombic-tetragonal phases at room temperature was found to possess curved Domain stripes and larger average Domain width, leading to optimal piezoelectric properties with d33* = 260 pm/V and kp = 48%. Based on the microstructures, polarization hysteresis loops and unipolar strain curves under high electric field, it was concluded that the larger Domain size and easier Domain switching are due to the coexistence of orthorhombic and tetragonal phases, account for the improved properties in KNNT-Li0.035 ceramics. © 2014 Elsevier Ltd. All rights reserved.

  • Domain Configuration and piezoelectric properties of k0 50na0 50 1 xlix nb0 80ta0 20 o3 ceramics
    Journal of The European Ceramic Society, 2014
    Co-Authors: Jialiang Zhang, Chunlei Wang, Shujun Zhang
    Abstract:

    Abstract Domain structure plays an important role in determining piezoelectric properties of ferroelectric materials. However, limited studies have been carried out on the Domains of (K,Na)NbO 3 -based lead free ceramics. The Domain Configuration, Domain reversal behavior and piezoelectric properties of (K 0.50 Na 0.50 ) 1− x Li x (Nb 0.80 Ta 0.20 )O 3 (KNN-Li x ) ceramics with x  = 0.02, 0.035 and 0.05, were studied in this research. It was observed that ceramics with different phases show distinctly different Domain Configurations and Domain reversal behaviors. When compared to other two compositions, x  = 0.035 with coexistent orthorhombic-tetragonal phases at room temperature was found to possess curved Domain stripes and larger average Domain width, leading to optimal piezoelectric properties with d 33 * = 260 pm/V and k p  = 48%. Based on the microstructures, polarization hysteresis loops and unipolar strain curves under high electric field, it was concluded that the larger Domain size and easier Domain switching are due to the coexistence of orthorhombic and tetragonal phases, account for the improved properties in KNNT-Li 0.035 ceramics.

Shige Wang - One of the best experts on this subject based on the ideXlab platform.

  • HASE - Domain-Specific Feature Modeling for High Integrity Vehicle Control System Functional Design
    2010 IEEE 12th International Symposium on High Assurance Systems Engineering, 2010
    Co-Authors: Shige Wang
    Abstract:

    Vehicle control system development is a complex process, involving multiple stages and multiple groups in different disciplines. Constructing a high-integrity Configuration for a product with a large number of control functions is very challenging in current practice because of lacking effective modeling methods to capture and maintain the individually-developed functions and their relations in the Configurations for a large variety of products. In this paper, we present a solution that tackles such design challenge using the combination of feature modeling and Domain-specific modeling. The solution adopts multi-level metamodeling with extensions and specializations to capture the Domain-specific needs. The functional design of a vehicle product is done through a step-wise Configuration and can be reasoned about using the logic formulas representing the Configuration. Domain-specific analysis for high-integrity vehicle control design, such as identifying "enabled" features, also becomes possible. Our preliminary evaluation based on applying the solution to a subset of the body control functional design has shown its effectiveness and applicability in a role-based, product line vehicle control development process.

  • Domain-Specific Feature Modeling for High Integrity Vehicle Control System Functional Design
    2010 IEEE 12th International Symposium on High Assurance Systems Engineering, 2010
    Co-Authors: Shige Wang
    Abstract:

    Vehicle control system development is a complex process, involving multiple stages and multiple groups in different disciplines. Constructing a high-integrity Configuration for a product with a large number of control functions is very challenging in current practice because of lacking effective modeling methods to capture and maintain the individually-developed functions and their relations in the Configurations for a large variety of products. In this paper, we present a solution that tackles such design challenge using the combination of feature modeling and Domain-specific modeling. The solution adopts multi-level metamodeling with extensions and specializations to capture the Domain-specific needs. The functional design of a vehicle product is done through a step-wise Configuration and can be reasoned about using the logic formulas representing the Configuration. Domain-specific analysis for high-integrity vehicle control design, such as identifying "enabled" features, also becomes possible. Our preliminary evaluation based on applying the solution to a subset of the body control functional design has shown its effectiveness and applicability in a role-based, product line vehicle control development process.