Active Projects | |
| BioFast | BioFast: Efficient and Seamless Access to Internet Accessible Biomolecular Data Sources |
| Cost Models for Wide Area Applications | Constructing and validating cost models for WebSources in a wide area environment with dynamic network and server workloads. |
| DWARF | An OLAP engine for computing, storing, and querying Data Cubes. |
| HOME | Heterogeneous Ontology Management Engine |
| IMPACT | Interactive Maryland Platform for Agents Collaborating Together |
| Knowledge Integration Research Initiative | Knowledge Integration Research Initiative |
| Latency Profiles | Performance Monitors to construct Latency Profiles for wide area applications. This research is a part of the NSF ITR funded Nebula Project which constructs Resource Profiles to reflect network latencies, patterns of updates and change at content servers, and the varying requirements of different clients and applications |
| Multi-Agent Security and Survivability | As the sheer number of deployment multiagent applications increases, there is a growing need to ensure the security and survivability of both the individual agents themselves, as well as the network of agents involved. We are developing a suite of architectures and methods to protect individual agents from being compromised, as well as methods to protect multiagent systems from being rendered inoperable due to malicious attacks and/or systems failures. |
| Nonmonotonic Reasoning | Though we are not working a lot in nonmonotonic logics, our work is some of the best known in this field. Almost all algorithms to compute stable models of logic programs are heavily influenced by our classical algorithm for this based on a mix of branch and bound and well founded model computation. We also developed the first methods for nonground computation of stable models. |
| Probabilistic Databases | Our lab is one of the pioneers in probabilistic databases. In the mid-90s, we proposed the ProbView data model - this is the first probabilistic data model that got rid of hidden independence assumptions and allowed the end user to ask queries taking into account, his knowledge of the dependencies between events. Later, we developed extensions of this model to handle probabilities in temporal databases, as well as object bases containing probabilities. We also developed probabilistic models of XML databases. More recently, we have been studying the problem of efficient computation of probabilistic aggregates. We are also developing the concept of spatio temporal probabilistic databases. |
| Probabilistic Logics | Our lab developed the now well known annotated logics used extensively nowadays to reason about uncertainty of different types. We developed the first probabilistic logic programs and gave them a syntax and semantics - many others have since implemented probabilistic LP systems. In addition, we were the first to develop temporal probabilistic logic programs. We are currently working on planning in uncertain domains, as well as probabilistic spatio temporal logics and agents. We are particularly looking at the use of probabilistic reasoning in conjunction with image and video analysis. |
| Opsis | View Management in the 21st Century |
| PASTA | Probabilistic and Spatio Temporal Agents |
| Source Quality and Content Metadata | Using quality and content metadata to describe, select and rank data sources |
| Web Query Optimization | Query planning and optimization in a wrapper mediator architecture of WebSources with limited capabilities. |
Past Projects | |
| ADMS | An Adaptive DBMS featuring viewcache, adaptive cost estimation, and enhanced client/server model. |
| AMASE | An Object-Oriented Metadatabase Catalog for Accessing Multi-Mission Astrophysics Data |
| Cextor | The Cextor Project |
| CHIMP | Collaborative Heterogeneous Interactive Multimedia Platform |
| CubeTree | A scalable indexing storage organization for Datacube aggregates in a data warehouse |
| Data AirWaves | Adaptive Data Dissemination Balancing Direct Broadcast Satellite Systems and Terrestrial Wireless Networks. |
| DDDBS | Disjunctive Deductive Database System |
| HERMES | Heterogeneous Reasoning and Mediator System |
| Information Mediation | Wrappers and mediators |
| MUDS | Multimedia Database Systems |
| Multimedia Knowledge Management | We have done extensive work over the years in the creation, storage and querying of multimedia data. We developed the first theory of multimedia database systems in the early/mid 90s. Later, we developed the CHIMP system - one of the first systems to automatically create multimedia presentations that showed different data to different users based on context. More recently, we have built models of databases for audio, video, multimedia presentations and Powerpoint data. We are currently working on scaling and summarizing audio video databases, and the concept of multimedia stories in conjunction with the archaeological department at Pompeii. We are studying ways to manage massive amounts of multimedia knowledge and to draw interesting inferences and aggregate activities from video data. |
| ProbView | Probabilistic Database Systems |
| SEuS | The SEuS Project |
| Source Selection for Wide Area Applications | Query planning and source selection that is responsive to client specifications of Quality of Access and Content Metadata. |
| SQO | Semantic Query Optimization |
| XSQ | XSQ: A Streaming XPath Engine |
| WebSemantics | Locating data sources on-the-fly |
| Wrapper Generation | Automatic generation of wrapper instances, for semi-structured Web-based data sources |
| VQBD | The VQBD Project |