Daniel Schwabe

HDM—a model-based approach to hypertext application design

Hypertext development should benefit from a systematic, structured development, especially in the case of large and complex applications. A structured approach to hypertext development suggests the notion of authoring-in-the-large. Authoring-in-the-large allows the description of overall classes of information elements and navigational structures of complex applications without much concern with implementation details, and in a system-independent manner. The paper presents HDM (Hypertext Design Model), a first step towards defining a general purpose model for authoring-in-the-large. Some of the most innovative features of HDM are: the notion of perspective; the identification of different categories of links (structural links, application links, and perspective links) with different representational roles; the distinction between hyperbase and access structures; and the possibility of easily integrating the structure of a hypertext application with its browsing semantics. HDM can be used in different manners: as a modeling device or as an implementation device. As a modeling device, it supports producing high level specifications of existing or to-be-developed applications. As an implementation device, it is the basis for designing tools that directly support application development. One of the central advantages of HDM in the design and practical construction of hypertext applications is that the definition of a significant number of links can be derived automatically from a conceptual-design level description. Examples of usage of HDM are also included.

The Semantic Web - ISWC 2006

Research Track.- Ranking Ontologies with AKTiveRank.- Three Semantics for Distributed Systems and Their Relations with Alignment Composition.- Semantics and Complexity of SPARQL.- Ontology-Driven Automatic Entity Disambiguation in Unstructured Text.- Augmenting Navigation for Collaborative Tagging with Emergent Semantics.- On the Semantics of Linking and Importing in Modular Ontologies.- RS2D: Fast Adaptive Search for Semantic Web Services in Unstructured P2P Networks.- SADIe: Semantic Annotation for Accessibility.- Automatic Annotation of Web Services Based on Workflow Definitions.- A Constraint-Based Approach to Horizontal Web Service Composition.- GINO - A Guided Input Natural Language Ontology Editor.- Fresnel: A Browser-Independent Presentation Vocabulary for RDF.- A Software Engineering Approach to Design and Development of Semantic Web Service Applications.- A Model Driven Approach for Building OWL DL and OWL Full Ontologies.- IRS-III: A Broker for Semantic Web Services Based Applications.- Provenance Explorer - Customized Provenance Views Using Semantic Inferencing.- On How to Perform a Gold Standard Based Evaluation of Ontology Learning.- Characterizing the Semantic Web on the Web.- MultiCrawler: A Pipelined Architecture for Crawling and Indexing Semantic Web Data.- /facet: A Browser for Heterogeneous Semantic Web Repositories.- Using Ontologies for Extracting Product Features from Web Pages.- Block Matching for Ontologies.- A Relaxed Approach to RDF Querying.- Mining Information for Instance Unification.- The Summary Abox: Cutting Ontologies Down to Size.- Semantic Metadata Generation for Large Scientific Workflows.- Reaching Agreement over Ontology Alignments.- A Formal Model for Semantic Web Service Composition.- Evaluating Conjunctive Triple Pattern Queries over Large Structured Overlay Networks.- PowerMap: Mapping the Real Semantic Web on the Fly.- Ontology-Driven Information Extraction with OntoSyphon.- Ontology Query Answering on Databases.- Formal Model for Ontology Mapping Creation.- A Semantic Context-Aware Access Control Framework for Secure Collaborations in Pervasive Computing Environments.- Extracting Relations in Social Networks from the Web Using Similarity Between Collective Contexts.- Can OWL and Logic Programming Live Together Happily Ever After?.- Innovation Detection Based on User-Interest Ontology of Blog Community.- Modeling Social Attitudes on the Web.- A Framework for Ontology Evolution in Collaborative Environments.- Extending Faceted Navigation for RDF Data.- Reducing the Inferred Type Statements with Individual Grouping Constructs.- A Framework for Schema-Driven Relationship Discovery from Unstructured Text.- Web Service Composition Via Generic Procedures and Customizing User Preferences.- Querying the Semantic Web with Preferences.- ONTOCOM: A Cost Estimation Model for Ontology Engineering.- Tree-Structured Conditional Random Fields for Semantic Annotation.- Framework for an Automated Comparison of Description Logic Reasoners.- Integrating and Querying Parallel Leaf Shape Descriptions.- A Survey of the Web Ontology Landscape.- CropCircles: Topology Sensitive Visualization of OWL Class Hierarchies.- Towards Knowledge Acquisition from Information Extraction.- A Method for Learning Part-Whole Relations.- Semantic Web in Use.- OntoWiki - A Tool for Social, Semantic Collaboration.- Towards a Semantic Web of Relational Databases: A Practical Semantic Toolkit and an In-Use Case from Traditional Chinese Medicine.- Information Integration Via an End-to-End Distributed Semantic Web System.- NEWS: Bringing Semantic Web Technologies into News Agencies.- Semantically-Enabled Large-Scale Science Data Repositories.- Construction and Use of Role-Ontology for Task-Based Service Navigation System.- Enabling an Online Community for Sharing Oral Medicine Cases Using Semantic Web Technologies.- EKOSS: A Knowledge-User Centered Approach to Knowledge Sharing, Discovery, and Integration on the Semantic Web.- Ontogator - A Semantic View-Based Search Engine Service for Web Applications.- Explaining Conclusions from Diverse Knowledge Sources.- A Mixed Initiative Semantic Web Framework for Process Composition.- Semantic Desktop 2.0: The Gnowsis Experience.- Towards Semantic Interoperability in a Clinical Trials Management System.- Active Semantic Electronic Medical Record.- Semantic Web Challenge.- Foafing the Music: Bridging the Semantic Gap in Music Recommendation.- Semantic MediaWiki.- Enabling Semantic Web Communities with DBin: An Overview.- MultimediaN E-Culture Demonstrator.- A Semantic Web Services GIS Based Emergency Management Application.- Doctoral Consortium.- Package-Based Description Logics - Preliminary Results.- Distributed Policy Management in Semantic Web.- Evaluation of SPARQL Queries Using Relational Databases.- Dynamic Contextual Regulations in Open Multi-agent Systems.- From Typed-Functional Semantic Web Services to Proofs.- Towards a Usable Group Editor for Ontologies.- Talking to the Semantic Web - Query Interfaces to Ontologies for the Casual User.- Changing Ontology Breaks Queries.- Towards a Global Scale Semantic Web.- Schema Mappings for the Web.- Triple Space Computing for Semantic Web Services - A PhD Roadmap.- Toward Making Online Biological Data Machine Understandable.- KeynoteAbstracts.- Where the Social Web Meets the Semantic Web.- The Semantic Web: Suppliers and Customers.- The Semantic Web and Networked Governance: Promise and Challenges.

An object oriented approach to Web-based applications design

In this paper we discuss the use of an object-oriented approach for web-based applications design, based on a method named Object-Oriented Hypermedia Design Method (OOHDM). We first motivate our work discussing the problems encountered while designing large scale, dynamic web-based applications, which combine complex navigation patterns with sophisticated computational behavior. We argue that a method providing systematic guidance to design is needed. Next, we introduce OOHDM, describing its main activities, namely: conceptual design, navigational design, abstract interface design and implementation, and discuss how OOHDM designs can be implemented in the WWW. Finally, related work and future research in this area are further discussed.

The object-oriented hypermedia design model

H ypermedia applications typically include complex information , and may allow sophisticated navigation behavior. The Object-Oriented Hypermedia Design Method (OOHDM) [4] uses abstraction and composition mechanisms in an object-oriented framework to, on one hand, allow a concise description of complex information items, and on the other hand, allow the specification of complex navigation patterns and interface transformations. In OOHDM, a hypermedia application is built in a four-step process supporting an incremental or prototype process model. Each step focuses on a particular design concern, and an object-oriented model is built. Classification, aggregation and generalization/specialization are used throughout the process to enhance abstraction power and reuse opportunities. Figure 1 summarizes the steps, products , mechanisms and design concerns in OOHDM. Domain Analysis In this step a conceptual model of the application domain is built using well-known object-oriented modeling principles [3], augmented with some primitives such as attribute perspectives (multiple-valued attributes, similar to HDM perspectives [1]). Conceptual classes may be built using aggregation and generalization/special-ization hierarchies. There is no concern for the types Abstract interface objects, responses to external events, interface transformations Running application

Systematic hypermedia application design with OOHDM

In this paper we analyze the process of hypermedia applications design and implementation, focusing in particular on two critical aspects of these applications: the navigational and interface structure. We discuss the way in which we build the navigation and abstract interface models using the Object-Oriented Hypermedia Design Method (OOHDM); we show which concerns must be taken into account for each task by giving examples from a real project we are developing, the Portinari Project. We show which implementation concerns must be considered when defining interface behavior, discussing both a Toolbook and a HTML implementation of the example application.

Steady and oscillatory thermocapillary convection in liquid columns with free cylindrical surface

In liquid columns (Prandtl number 8·9) with free cylindrical surface heated from above, strong thermocapillary convection (TC) has been observed. Stationary thermocapillary convection exists in the form of a single axially symmetric roll bound to the free surface. For aspect ratios l/a The influence of buoyant forces due to horizontal temperature gradients in the experiments was also studied. Buoyant forces become obvious for a contaminated free surface and in bulk regions far from the cylinder surface. The thermocapillary convection shows a transition to time-dependent oscillatory motion when a critical Marangoni number Ma c is exceeded. A unique Ma c = 7 × 10 3 has been found for zones with lengths l Ma c ) of the distortion has been found. The non-dimensional frequency of the temperature oscillations is independent of zone size if the aspect ratio is held constant. However, the non-dimensional frequency of temperature oscillations increases linearly with the aspect ratio of the zone. This result is interpreted as a dependence of the phase velocity of the running disturbance on the aspect ratio.

A hybrid approach for searching in the semantic web

This paper presents a search architecture that combines classical search techniques with spread activation techniques applied to a semantic model of a given domain. Given an ontology, weights are assigned to links based on certain properties of the ontology, so that they measure the strength of the relation. Spread activation techniques are used to find related concepts in the ontology given an initial set of concepts and corresponding initial activation values. These initial values are obtained from the results of classical search applied to the data associated with the concepts in the ontology. Two test cases were implemented, with very positive results. It was also observed that the proposed hybrid spread activation, combining the symbolic and the sub-symbolic approaches, achieved better results when compared to each of the approaches alone.

Experiments on surface tension driven flow in floating zone melting

Abstract Surface tension driven flow in a NaNO 3 floating zone has been observed. It is comparable to natural convection and probably also important in many crystal growth techniques with a free melt surface. In experiments, related to floating zones, temperature oscillations have been found to be induced by oscillations of the surface tension driven flow which might be instable at higher driving forces. The frequency of these oscillations is proportional to the average temperature gradient imposed upon the free surface. This dependence might be used to identify oscillations of this kind. Surface tension driven flow induced by the concentration gradient of a surface-active impurity has been observed to be not negligible. A further mechanism for growth instability is discussed, which is based on surface tension gradients due to the concentration gradient of a surface-active impurity in front of a growing crystal.

Designing personalized web applications

The goal of this paper is to argue the need to approach the personalization issues in Web applications from the very beginning in the application’s development cycle. Since personalization is a critical aspect in many popular domains such as e-commerce, it important enough that it should be dealt with through a design view, rather than only an implementation view (which discusses mechanisms, rather than design options). We present different scenarios of personalization covering most existing applications. Since our design approach is based on the Object-Oriented Hypermedia Design Method, we briefly introduce i the way in which we build Web application models as object -oriented views of conceptual models. We show how we specify personalized Web applications by refining views according to users’ profiles or preferences; we show that an object -oriented approach allows maximizing reuse in these specifications. We discuss some implementation aspects and compare our work with related approaches, and present some concluding remarks.

Some evidence for the existence and magnitude of a critical marangoni number for the onset of oscillatory flow in crystal growth melts

Abstract Experiments on floating half zones of NaNO3 heated from above show the onset of oscillatory Marangoni convection at a critical Marangoni number Ma(T)c ∼ 104. The dependence of Ma(T)c on zone length is investigated and discussed. Literature on the onset of temperature oscillations is reviewed. It gives Ma(T)c of the same order of magnitude for other melts. Effects of oscillatory Marangoni convection in crystal growth from melt are discussed. A description of the state of oscillatory Marangoni convection in this geometry is given.