The 18th Australian Joint Conference on Artificial Intelligence (AI 2005) was held at the University of Technology, Sydney (UTS), Sydney, Australia from 5 to 9 December 2005. AI 2005 attracted a historical record number of submissions, a total of 535 papers. The review process was extremely selective. Out of these 535 submissions, the Program Chairs selected only 77 (14.4%) full papers and 119 (22.2%) short papers based on the review reports, making an acceptance rate of 36.6% in total. Authors of the accepted papers came from over 20 countries. This volume of the proceedings contains the abstracts of three keynote speeches and all the full and short papers. The full papers were categorized into three broad sections, namely: AI foundations and technologies, computational intelligence, and AI in specialized domains. AI 2005 also hosted several tutorials and workshops, providing an interacting mode for specialists and scholars from Australia and other countries. Ronald R. Yager, Geoff Webb and David Goldberg (in conjunction with ACAL05) were the distinguished researchers invited to give presentations. Their contributions to AI 2005 are really appreciated.

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Invited Talks.- K-Optimal Pattern Discovery: An Efficient and Effective Approach to Exploratory Data Mining.- Providing Semantics for the WEB Using Fuzzy Set Methods.- Little Models, Big Results.- I: AI Foundations and Technologies.- Model Updating CTL Systems.- Model Checking for PRS-Like Agents.- A Fibred Belief Logic for Multi-agent Systems.- Inconsistency-Based Strategy for Clarifying Vague Software Requirements.- Conditioning Graphs: Practical Structures for Inference in Bayesian Networks.- Reasoning with the Outcomes of Plan Execution in Intentional Agents.- Tie Breaking in Clause Weighting Local Search for SAT.- Syntactic and Semantic Disambiguation of Numeral Strings Using an N-Gram Method.- Locating Regions of Interest in CBIR with Multi-instance Learning Techniques.- Ensemble Selection for SuperParent-One-Dependence Estimators.- Global Versus Local Constructive Function Approximation for On-Line Reinforcement Learning.- Any-Cost Discovery: Learning Optimal Classification Rules.- Preprocessing Time Series Data for Classification with Application to CRM.- Combining Contents and Citations for Scientific Document Classification.- Machine Learning Approach to Realtime Intrusion Detection System.- Structural Abstraction Experiments in Reinforcement Learning.- A Hybrid Adaptive Multi-objective Memetic Algorithm for 0/1 Knapsack Problem.- Probability Estimation in Error Correcting Output Coding Framework Using Game Theory.- Evaluation of Strings in Computer Go Using Articulation Points Check and Seki Judgment.- The Value of Stealth in the Game of Chess.- Coordinated Collision Avoidance of Multiple Biomimetic Robotic Fish.- The Virtual Room Inhabitant - Intuitive Interaction with Intelligent Environments.- Evaluating Techniques for Resolving Redundant Information and Specularity in Occupancy Grids.- II: Computational Intelligence.- Analyzing Security Protocols Using Association Rule Mining.- Redundant Association Rules Reduction Techniques.- Construction Algorithm of Principal Curves in the Sense of Limit.- Collateral Missing Value Estimation: Robust Missing Value Estimation for Consequent Microarray Data Processing.- Using Neural Networks to Support Early Warning System for Financial Crisis Forecasting.- A Neural Network Based Methodology for Performance Evaluation of Parallel Systems.- Decomposition and Resolution of Fuzzy Relation Equations (II) Based on Boolean-Type Implications.- Applying a Fuzzy Trust Model to E-Commerce Systems.- Emotion-Based Crowd Simulation Using Fuzzy Algorithm.- A Genetic Algorithm for Job Shop Scheduling with Load Balancing.- A Co-evolutionary Particle Swarm Optimization-Based Method for Multiobjective Optimization.- The Effect of Mutation on the Accumulation of Information in a Genetic Algorithm.- Linear Genetic Programming for Multi-class Object Classification.- Evolutionary Design of Fuzzy Classifiers Using Information Granules.- Constrained Optimization by the ? Constrained Hybrid Algorithm of Particle Swarm Optimization and Genetic Algorithm.- Automated Information Mediator for HTML and XML Based Web Information Delivery Service.- Agent-Based Middleware for Web Service Dynamic Integration on Peer-to-Peer Networks.- Towards User Profiling for Web Recommendation.- A Controlled Natural Language Layer for the Semantic Web.- GaXsearch: An XML Information Retrieval Mechanism Using Genetic Algorithms.- A New Approach on ? to Decision Making Using Belief Functions Under Incomplete Information.- A Hybrid Recommendation Approach for One-and-Only Items.- Exchange Rate Modelling Using News Articles and Economic Data.- Adaptive Utility-Based Scheduling in Resource-Constrained Systems.- III: AI in Specialized Domains.- New Feature Extraction Approaches for Face Recognition.- EBGM with Fuzzy Fusion on Face Recognition.- Robust License Plate Segmentation Method Based on Texture Features and Radon Transform.- An Adaptive Selection of Motion for Online Hand-Eye Calibration.- Scene Boundary Detection by Audiovisual Contents Analysis.- k-Nearest Neighbors Associative Memory Model for Face Recognition.- A New Spectral Smoothing Algorithm for Unit Concatenating Speech Synthesis.- New Fuzzy Skin Model for Face Detection.- Kernel Nonparametric Weighted Feature Extraction for Classification.- Iterative Training Techniques for Phonetic Template Based Speech Recognition with a Speaker-Independent Phonetic Recognizer.- Active Visual Learning and Recognition Using Incremental Kernel PCA.- Automated Scene Understanding for Airport Aprons.- Semantic Correlation Network Based Text Clustering.- Time-Varying Prototype Reduction Schemes Applicable for Non-stationary Data Sets.- Multi-agent System Simulating Tumoral Cells Migration.- An Intelligent Agent-Based Framework for Collaborative Information Security.- Agents, Information and Trust.- Modelling Partner's Behaviour in Agent Negotiation.- Insurance Services in Multi-agent Systems.- Dynamic Team Forming in Self-interested Multi-agent Systems.- N-Learning: A Reinforcement Learning Paradigm for Multiagent Systems.- Preferences of Agents in Defeasible Logic.- MAHIS: An Agent-Oriented Methodology for Constructing Dynamic Platform-Based HIS.- 3D Game Engine for Real-Time Facial Animation.- Intelligent 3D Video Avatar for Immersive Telecommunication.- A Lagrangian Heuristic for Winner Determination Problem in Combinatorial Auctions.- Moving Cast Shadow Detection and Removal for Visual Traffic Surveillance.- A Hidden Markov Model and Immune Particle Swarm Optimization-Based Algorithm for Multiple Sequence Alignment.- Design of Intelligent Security Management System Using Simulation-Based Analysis.- Neighborhood Re-structuring in Particle Swarm Optimization.- IV: Short Papers.- Understanding the Pheromone System Within Ant Colony Optimization.- Model Checking Sum and Product.- The Proof Algorithms of Plausible Logic Form a Hierarchy.- A Maximum Entropy Model for Transforming Sentences to Logical Form.- An Information-Theoretic Causal Power Theory.- A Fixed-Point Semantics for Plausible Logic.- Applying Indiscernibility Attribute Sets to Knowledge Reduction.- Dempster Conditioning and Conditional Independence in Evidence Theory.- Case-Based Conflict Resolution in Multi-agent Ship Design System.- Reduced MDP Representation of a Logistical Planning Problem Using Petri-Nets.- Structure-Based Algorithms for Computing Preferred Arguments of Defeasible Knowledge Bases.- Solving Job-Shop Scheduling Problems by a Novel Artificial Immune System.- Agent-Based Ontology Mapping Towards Ontology Interoperability.- Dynamic Negative Selection Algorithm Based on Match Range Model.- A Virtual Prolog Approach to Implementing Beliefs, Desires and Intentions in Animat Agents.- Obstacle Avoidance and Path Planning Based on Flow Field for Biomimetic Rob…