Julian Gallop

Rutherford Appleton Laboratory, Computing, Faculty Member

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Address: Oxford University, City of Oxford, United Kingdom

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Papers by Julian Gallop

ARGSLIB - ARGS Subroutine Library

Starlink User Note, 1986

Using Virtual Environments to Enhance Visualization

Within the EU ESPRIT demonstrator project VIVRE, a commercial virtual environment system has been... more Within the EU ESPRIT demonstrator project VIVRE, a commercial virtual environment system has been used to create a user-centred interaction environment for two commercial general-purpose data visualization systems. The project has exploited mechanisms provided by all three systems to incorporate new user-developed functionality. In addition to updating and navigating the visualization scene, this includes user control of the visualization application from within the virtual environment. The project is assessing the degree to which this extended interactive capability results in greater benefits for commercial users.

VIVRE: User-centred visualization

High-Performance Computing and Networking, 1999

A new approach to visualization is described which places the user at the centre of this interact... more A new approach to visualization is described which places the user at the centre of this interactive, investigative process. This is achieved by integrating the immersive user interaction environment provided by a virtual reality system with the comprehensive visualization capability provided by two established data visualization systems. User&amp;amp;#39;s existing investment in visualization applications is thus protected while offering them a

J.V.Healy, Experience with data mining for the anaerobic wastewater treatment process, Environmental Modelling and Software,pp xx

Anaerobic digestion provides an effective way of disposing of organic material in wastewater. The... more Anaerobic digestion provides an effective way of disposing of organic material in wastewater. The EUfunded TELEMAC project aims at improving the reliability and efficiency of monitoring and control of this type of wastewater treatment plant. One of its special features is the idea of a telecontrol centre which monitors multiple, geographically distributed plants remotely, acts as a centre of expertise, and brings together the expertise of a network of remote experts. Data mining has been identified as a potentially useful contributing technology. Sensor data is now becoming available for some pilot, laboratory scale, and industrial sized digesters. This paper presents the directions of work and emerging results of data mining. Particular themes considered here include: • experience gained in the data mining exercise; • the use of confidence and prediction intervals; • prospects for generalisation over different sizes and types of anaerobic digester; • relationship to the overall sup...

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Review of Visualization Systems

Visualization Objects [19] are rendered to a 2D screen or, for stereoscopic vision, two screens -... more Visualization Objects [19] are rendered to a 2D screen or, for stereoscopic vision, two screens - one for each eye. When mounted into moveable, trackable object such as a boom box or helmet one can once again appear to walk around the objects. This virtual reality is currently a more promising direction than true 3D displays and potentially has great application to visualization e.g., the NASA Virtual Wind Tunnel project [13]. Images Rendering images typically involves a one-to-one mapping from image pixels to screen pixels. Panning is readily provided for in a windowing environment, and zoom is often provided by bilinear or bicubic interpolation. Geometry Rendering geometric models uses classic computer graphics principles, with hidden surface removal, local illumination models, shading, and transformation to a 2D image with perspective. The algorithms for doing this are well established and some may be implemented in hardware. Volume To render volume data, it is assumed that cl...

Abstract Distributed and Collaborative Visualization

Visualization is a powerful tool for analysing data and presenting results in science, engineerin... more Visualization is a powerful tool for analysing data and presenting results in science, engineering and medicine. This paper reviews ways in which it can be used in distributed and/or collaborative enviroments. Distributed visualization addresses a number of resource allocation problems, including the location of processing close to data for the minimization of data traffic. The advent of the Grid Computing paradigm and the link to Web Services provides fresh challenges and opportunities for distributed visualization—including the close coupling of simulations and visualizations in a steering environment. Recent developments in collaboration have seen the growth of specialized facilities (such as Access Grid) which have supplemented traditional desktop video conferencing using the Internet and multicast communications. Collaboration allows multiple users—possibly at remote sites—to take part in the visualization process at levels which range from the viewing of images to the shared c...

Data mining to support anaerobic waste water treatment plant monitoring and control in the TELEMAC project

ABSTRACT

The use of data mining for the monitoring and control of anaerobic waste water treatment plants

ABSTRACT

Integration of Graphics and OSI Standards

1 Overview of Project.- 1.1 Introduction.- 1.2 Initial Objectives.- 1.3 Related Work.- 13.1 Graph... more 1 Overview of Project.- 1.1 Introduction.- 1.2 Initial Objectives.- 1.3 Related Work.- 13.1 Graphics Standards.- 1.3.2 Examples of Distributed Graphics Systems.- 2 Classification.- 2.1 Overview.- 2.1.1 Aims and Goals.- 2.1.2 Collection of the Data.- 2.1.3 Relationship to External Activities.- 2.2 Results of Data Collection.- 2.2.1 General.- 2.2.2 Graphics Used.- 2.2.3 Networking Used.- 2.3 A Taxonomy for Application Classification.- 2.3.1 Overview.- 2.3.2 Classification Metrics.- 2.3.3 Derivation of Taxonomy.- 2.3.4 Taxonomy Framework.- 2.3.5 Initial Elaboration of the Taxonomy Framework.- 2.4 Examples of Using the Taxonomy Framework.- 2.4.1 Wide Range of Requirements.- 2.4.2 Similar Requirements.- 2.4.3 Multiple Associations.- 2.4.4 Semantic Content of Image Data.- 2.4.5 Design and Analysis Aid.- 2.5 Conclusions.- 2.5.1 Summary.- 2.5.2 Future Development.- 2.5.3 Acknowledgements.- 3 Network Connectivity Study.- 3.1 Introduction.- 3.2 Networking Requirements of the Application Prototype.- 3.3 PSPDN Connections and Host Equipment at Partner Sites.- 3.4 Performance and Reliability of PSPDNs.- 3.4.1 COSINE Performance Study.- 3.4.2 COSINE Reliability Study.- 3.4.3 Availability of Higher Speed Services.- 3.5 Development of a Testing Regime.- 3.6 Results of Throughput and Reliability Tests.- 3.6.1 Throughput Results.- 3.6.2 Reliability.- 3.7 Conclusions.- 3.8 Recommendations Concerning the Application Prototype.- 4 Standardization Activities.- 4.1 Standards.- 4.2 CGM and FTAM.- 4.2.1 Introduction.- 4.2.2 Mapping the CGM onto FTAM.- 4.2.3 Implementation of the Document Type.- 4.2.4 Evaluation of Document Types for General Structured Access.- 4.3 ASN.1 Notation for CGM.- 4.3.1 Background and Overview.- 4.3.2 Coverage of CGM Elements.- 4.3.3 Approach to ASN. 1 Description.- 4.3.4 ARGOSI CGM-ASN.1 Tools.- 4.3.5 Comparison of BER with Other Encodings.- 4.3.6 Final Status.- 4.3.7 Interim Conclusions.- 4.4 Mapping of the X Window System onto an OSI stack.- 5 The ARGOSI Demonstrator.- 5.1 The Demonstrator Scenario.- 5.2 The User's View.- 5.3 Architecture of the Application.- 5.4 OSI Services.- 5.4.1 Common API Specifications and Implementation.- 5.4.2 First Implementation of a Hierarchical Document Type.- 5.4.3 Three Different Implementations.- 5.4.4 Limitations.- 5.4.5 Performance.- 5.5 Graphics Services.- 5.5.1 The Use of Metafiles.- 5.5.2 Editing of Metafiles.- 5.5.3 Use of CGM Amendment 1.- 5.5.4 Relationship between CGM and CGI.- 5.5.5 CGM Toolkits.- 5.5.6 CGI Implementation.- 5.5.7 Summary.- 5.6 GDF to CGM Format Converter.- 5.7 How did the Prototype Application Meet the Aims?.- 5.7.1 Introduction.- 5.7.2 Meeting the Aims.- 5.7.3 Summary.- 5.8 Conclusions.- 6 The ARGOSI Workshops.- 6.1 Graphics and Communications.- 6.1.1 Structure.- 6.1.2 Discussions.- 6.1.3 Discussion Groups.- 6.1.4 Summary and Conclusions.- 6.2 Distributed Window Systems.- 6.2.1 Structure.- 6.2.2 Working Groups.- 6.2.3 Conclusions and Recommendations.- 6.2.4 Proceedings.- 7 Evaluation of the Project.- 7.1 Demonstration at the 1991 ESPRIT Exhibition in Brussels.- 7.2 Dissemination of Results.- 7.2.1 Input to Standardization Bodies.- 7.2.2 Registration of CGM-FTAM Document Type.- 7.2.3 Finalization and Publication of ISO/IEC 9636 (CGI).- 7.2.4 Finalization and Publication of Amendments to ISO/IEC 8632 (CGM)..- 7.2.5 Transfer Formats for CGM Based on ASN.1.- 7.3 Contribution to Workshops and Conferences.- 7.4 Summary of Achievements.- Appendix 1-Summaries of Throughput Results.- Appendix 2-Call Failures.- Appendix 3-ASN.1 Notation for CGM Subset.- Appendix 4-Contributors to the Project Work.- Appendix 5-Publications and Contributions.

Investigating a component-oriented approach to adaptive collaborative visualization

Collaborative tools are developed to support work being undertaken by dispersed teams. As well as... more Collaborative tools are developed to support work being undertaken by dispersed teams. As well as allowing voice and audio, several initiatives have supported collaborative information-rich tasks by enabling dispersed participants to share their visualization insights and to exercise some distributed control. In previous work, tools for collaborative visualization have been based on dataflow visualization systems, allowing visual programs to be rapidly prototyped and allowing not only the sharing of final results but also the process of obtaining them. However there are a number of issues: (1) the need for software policy changes, according to different meeting styles; (2) the presence of competing continuous flows, including voice and video of the participants and visualization movie sequences, in addition to bulk data flows; and (3) the dynamics of available resources which vary between participants or between mobile and office situations or within a single meeting. This need for ...

Distributed Cooperative Visualization-The MANICORAL Approach

Eurographics UK …, 1998

... DA Duce, JR Gallop, IJ Johnson, K. Robinson, CD Seelig and CS Cooper Department for Computati... more

Review of Visualisation Systems c: agocgcdeportsvisualvissystDOGBOO_3. HTM Page 1 of 147 02/24/99

Visualization Objects [19] are rendered to a 2D screen or, for stereoscopic vision, two screens-o... more Visualization Objects [19] are rendered to a 2D screen or, for stereoscopic vision, two screens-one foreach eye. When mounted into moveable, trackable object such as a boom box or helmet one can once again appearto walk around the objects. This virtual reality is currently a more promising direction than true 3D displays andpotentially has great application to visualization eg, the NASA Virtual Wind Tunnel project [13]. ImagesRendering images typically involves a one-to-one mapping from image pixels to screen pixels. ...

Number: 9 Technical Report Series February 1995

Visualization Objects [19] are rendered to a 2D screen or, forstereoscopic vision, two screens-on... more Visualization Objects [19] are rendered to a 2D screen or, forstereoscopic vision, two screens-one for each eye. When mounted into moveable, trackableobject such as a boom box or helmet one can once again appear to walk around the objects. Thisvirtual reality is currently a more promising direction than true 3D displays and potentially hasgreat application to visualization eg, the NASA Virtual Wind Tunnel project [13]. ImagesRendering images typically involves a one-to-one mapping from image pixels to screen pixels. ...

Distributed Cooperative Visualization

ABSTRACT