The natural mission of Computational Science is to tackle all sorts of human problems and to work out intelligent automata aimed at alleviating the b- den of working out suitable tools for solving complex problems. For this reason ComputationalScience,thoughoriginatingfromtheneedtosolvethemostch- lenging problems in science and engineering (computational science is the key player in the ?ght to gain fundamental advances in astronomy, biology, che- stry, environmental science, physics and several other scienti?c and engineering disciplines) is increasingly turning its attention to all ?elds of human activity. In all activities, in fact, intensive computation, information handling, kn- ledge synthesis, the use of ad-hoc devices, etc. increasingly need to be exploited and coordinated regardless of the location of both the users and the (various and heterogeneous) computing platforms. As a result the key to understanding the explosive growth of this discipline lies in two adjectives that more and more appropriately refer to Computational Science and its applications: interoperable and ubiquitous. Numerous examples of ubiquitous and interoperable tools and applicationsaregiveninthepresentfourLNCSvolumescontainingthecontri- tions delivered at the 2004 International Conference on Computational Science and its Applications (ICCSA 2004) held in Assisi, Italy, May 14-17, 2004.

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Grid Computing Workshop.- Advanced Simulation Technique for Modeling Multiphase Fluid Flow in Porous Media.- The P-GRADE Grid Portal.- A Smart Agent-Based Grid Computing Platform.- Publishing and Executing Parallel Legacy Code Using an OGSI Grid Service.- The PROVE Trace Visualisation Tool as a Grid Service.- Privacy Protection in Ubiquitous Computing Based on Privacy Label and Information Flow.- Resource Management and Scheduling Techniques for Cluster and Grid Computing Systems Workshop.- Application-Oriented Scheduling in the Knowledge Grid: A Model and Architecture.- A Monitoring and Prediction Tool for Time-Constraint Grid Application.- Optimal Server Allocation in Reconfigurable Clusters with Multiple Job Types.- Design and Evaluation of an Agent-Based Communication Model for a Parallel File System.- Task Allocation for Minimizing Programs Completion Time in Multicomputer Systems.- Fault Detection Service Architecture for Grid Computing Systems.- Adaptive Interval-Based Caching Management Scheme for Cluster Video Server.- A Scalable Streaming Proxy Server Based on Cluster Architecture.- The Measurement of an Optimum Load Balancing Algorithm in a Master/Slave Architecture.- Data Discovery Mechanism for a Large Peer-to-Peer Based Scientific Data Grid Environment.- A DAG-Based XCIGS Algorithm for Dependent Tasks in Grid Environments.- Running Data Mining Applications on the Grid: A Bag-of-Tasks Approach.- Parallel and Distributed Computing Workshop.- Application of Block Design to a Load Balancing Algorithm on Distributed Networks.- Maintenance Strategy for Efficient Communication at Data Warehouse.- Conflict Resolution of Data Synchronization in Mobile Environment.- A Framework for Orthogonal Data and Control Parallelism Exploitation.- Multiplier with Parallel CSA using CRT's Specific Moduli (2 k -1, 2 k , 2 k +1).- Unified Development Solution for Cluster and Grid Computing and Its Application in Chemistry.- Remote Visualization Based on Grid Computing.- Avenues for High Performance Computation on a PC.- A Modified Parallel Computation Model Based on Cluster.- Parallel Testing Method by Partitioning Circuit Based on the Exhaustive Test.- A Parallel Volume Splatting Algorithm Based on PC-Clusters.- Molecular Processes Simulation Workshop.- Three-Center Nuclear Attraction Integrals for Density Functional Theory and Nonlinear Transformations.- Parallelization of Reaction Dynamics Codes Using P-GRADE: A Case Study.- Numerical Implementation of Quantum Fluid Dynamics: A Working Example.- Numerical Revelation and Analysis of Critical Ignition Conditions for Branch Chain Reactions by Hamiltonian Systematization Methods of Kinetic Models.- Computer Simulations in Ion-Atom Collisions.- Bond Order Potentials for a priori Simulations of Polyatomic Reactions.- Inorganic Phosphates Investigation by Support Vector Machine.- Characterization of Equilibrium Structure for N2-N2 Dimer in 1.2Å? R?2.5Å Region Using DFT Method.- A Time Dependent Study of the Nitrogen Atom Nitrogen Molecule Reaction.- From DFT Cluster Calculations to Molecular Dynamics Simulation of N2 Formation on a Silica Model Surface.- Molecular Mechanics and Dynamics Calculations to Bridge Molecular Structure Information and Spectroscopic Measurements on Complexes of Aromatic Compounds.- Direct Simulation Monte Carlo Modeling of Non Equilibrium Reacting Flows. Issues for the Inclusion into a ab initio Molecular Processes Simulator.- Molecular Simulation of Reaction and Adsorption in Nanochemical Devices: Increase of Reaction Conversion by Separation of a Product from the Reaction Mixture.- Quantum Generalization of Molecular Dynamics Method. Wigner Approach.- C6NH6 ?+? Ions as Intermediates in the Reaction between Benzene and N?+? Ions.- Towards a Full Dimensional Exact Quantum Calculation of the Li + HF Reactive Cross Section.- Conformations of 1,2,4,6-Tetrathiepane.- Fine Grain Parallelization of a Discrete Variable Wavepacket Calculation Using ASSIST-CL.- Numerical Models in Biomechanics Session.- On the Solution of Contact Problems with Visco-Plastic Friction in the Bingham Rheology: An Application in Biomechanics.- On the Stress-Strain Analysis of the Knee Replacement.- Musculoskeletal Modeling of Lumbar Spine under Follower Loads.- Computational Approach to Optimal Transport Network Construction in Biomechanics.- Encoding Image Based on Retinal Ganglion Cell.- Scientific Computing Environments (SCE's) for Imaging in Science Session.- A Simple Data Analysis Method for Kinetic Parameters Estimation from Renal Measurements with a Three-Headed SPECT System.- Integrating Medical Imaging into a Grid Based Computing Infrastructure.- Integrating Scientific Software Libraries in Problem Solving Environments: A Case Study with ScaLAPACK.- Parallel/Distributed Film Line Scratch Restoration by Fusion Techniques.- An Interactive Distributed Environment for Digital Film Restoration.- Computer Graphics and Geometric ModelingWorkshop (TSCG 2004).- On Triangulations.- Probability Distribution of Op-Codes in Edgebreaker.- Polyhedron Splitting Algorithm for 3D Layer Generation.- Synthesis of Mechanical Structures Using a Genetic Algorithm.- Optimal Direction for Monotone Chain Decomposition.- GTVIS: Fast and Efficient Rendering System for Real-Time Terrain Visualization.- Target Data Projection in Multivariate Visualization - An Application to Mine Planning.- Parametric Freehand Sketches.- Variable Level of Detail Strips.- Bézier Solutions of the Wave Equation.- Matlab Toolbox for a First Computer Graphics Course for Engineers.- A Differential Method for Parametric Surface Intersection.- A Comparison Study of Metaheuristic Techniques for Providing QoS to Avatars in DVE Systems.- Visualization of Large Terrain Using Non-restricted Quadtree Triangulations.- Boundary Filtering in Surface Reconstruction.- Image Coherence Based Adaptive Sampling for Image Synthesis.- A Comparison of Multiresolution Modelling in Real-Time Terrain Visualisation.- Photo-realistic 3D Head Modeling Using Multi-view Images.- Texture Mapping on Arbitrary 3D Surfaces.- Segmentation-Based Interpolation of 3D Medical Images.- A Bandwidth Reduction Scheme for 3D Texture-Based Volume Rendering on Commodity Graphics Hardware.- An Efficient Image-Based 3D Reconstruction Algorithm for Plants.- Where the Truth Lies (in Automatic Theorem Proving in Elementary Geometry).- Helical Curves on Surfaces for Computer-Aided Geometric Design and Manufacturing.- An Application of Computer Graphics for Landscape Impact Assessment.- Fast Stereo Matching Using Block Simil…