How To Search for Complex Patterns over Streaming and Stored Data ∗ (2008)
S. Chakravarthy, L. Elkhalifa, N. Deshp
The colossal amount of digitized information available has resulted in overloading users who need to navigate this information for their routine requirements. Information filtering deals with...
Important Membership, Announcement D. Lomet, S. B. Navathe, A. Tanaka, S. Chakravarthy, S. Ceri, ...
S. Chakravarthy, K. Karlapalem, S. B. Navathe, A. Tanaka, Kamalakar Karlapalem, Shamkant B. Navathe, ...
(Submitted for publication)
Ahmed, B.Y., Chakravarthy, S., Eggers, R., Hermens, W.T., Zhang, J.Y., Niclou, S.P., ...
BACKGROUND: Inactivating genes in vivo is an important technique for establishing their function in the adult nervous system. Unfortunately, conventional knockout mice may suffer from several...
Ahmed, B.Y., Chakravarthy, S., Eggers, R., Zhang, J.Y., Niclou, S.P., ...
Background: Inactivating genes in vivo is an important technique for establishing their function in the adult nervous system. Unfortunately, conventional knockout mice may suffer from several...
Ahmed, B.Y., Chakravarthy, S., Eggers, R., Hermens, W.T., Zhang, J.Y., Niclou, S.P., ...
BACKGROUND: Inactivating genes in vivo is an important technique for establishing their function in the adult nervous system. Unfortunately, conventional knockout mice may suffer from several...
Ahmed, B.Y., Chakravarthy, S., Eggers, R., Hermens, W.T., Zhang, J.Y., Niclou, S.P., ...
BACKGROUND: Inactivating genes in vivo is an important technique for establishing their function in the adult nervous system. Unfortunately, conventional knockout mice may suffer from several...
Chakravarthy, S., Krishnaprasad, V., Tamizuddin, Z., Kim, S-K
This effort is a result of a jointly-funded agreement between NAVY/NCCOSC and USAF/Rome Laboratory in the area of intelligent knowledge base systems. During the last decade, database management...
Support for Temporal Events in Sentinel: Design, Implementation, and Preprocessing (1998)
Chakravarthy, S., Lee, H., Kim, H.
This effort performs research in the area of active databases. During the last decade, the functionality of databases has been extended to encompass a large range of applications which tend to be...
Distributed Events in Sentinel: Design and Implementation of a Global Event Detector (1998)
Chakravarthy, S., Liao, H., Kim, H.
In conventional database management systems, data are created, updated, retrieved and deleted in a passive way; that is, only in response to operations performed by users or application programs....
Event-condition-action (or ECA) rules are used to capture active capability. While a number of research prototvpes of active database systems have been built, ECA rule capability in Relational DBMSs...
Chakravarthy, S., Kim, Y., Gopalakrishnan, G.
The objective of this effort was to investigate knowledge base management integration techniques for extracting intelligent information for a network-centered C4I environment. This report describes...
Events and Rules for JAVA: Design and Implementation of a Seamless Approach (1998)
This report investigates the re-designing and implementation of an active database subsystem in the JAVA environment. This was accomplished to overcome some of the limitations of the C++ environment...
Progress in the Parallelization of the SOCRATES-P Missile Plume Code (1998)
Smith, T., Cline, J., Braunstein, M., Chakravarthy, S.
Progress report in the implementation of a parallelized version of SOCRATES under HPCMP CHSSI Project CFD-10. Examples of the increased capabilities of the Pre-Alpha code are given along with an...
This report discusses various architectures and implementation issues and discusses our approach for a publish/subscribe based distributed alert server (SPAWAR application) whose requirements...
Chakravarthy, S., Varakala, S.
This report provides a novel approach for supporting the creation of rules and events dynamically at run time, which is critical for several classes of monitoring applications. The proposed approach...
SIEVE: An Interactive Visualization and Explanation Tool for An Active OODBMS. (1997)
Chakravarthy, S., Zhou, J., Kim, S-K., Hong, D.
The active functionality is usually incorporated into DBMSs by the event-condition -action (ECA) rule abstraction. Using ECA rules in active database systems for real life applications involves...
Result Sharing Among Agents Using Reactive Rules (1997)
M. Berndtsson, S. Chakravarthy, B. Lings
Abstract. This paper critically analyse the use of active databases as an enabling technology for result sharing as defined in the DAI literature. In particular, we demostrate how ECA...
Coordination Among Agents Using Reactive Rules (1996)
M. Berndtsson, S. Chakravarthy, B. Lings
Coordination and collaboration are naturally used by groups for carrying out activities and solving problems that require cooperation. However, getting a set of computer agents to do that same has...
Cooperative Problem Solving: A New Direction for Active Databases (1996)
M. Berndtsson, S. Chakravarthy, B. Lings
this paper is to evaluate and demonstrate the applicability of the active rule paradigm in novel application domains. Briefly, an active rule capability is supported through the ECA...
Locking Based Concurrency Control for Integrated Real-Time Database Systems (1996)
D. Hong, S. Chakravarthy, T. Johnson
In many database applications, incoming transactions are a mixed load of conventional (non real-time) and real-time (typically soft and firm) transactions. In this environment, transactions can even...
Cooperative Problem Solving: A New Direction for Active Databases (1996)
M. Berndtsson, S. Chakravarthy, B. Lings
this paper is to evaluate and demonstrate the applicability of the active rule paradigm in novel application domains. Briefly, an active rule capability is supported through the ECA...
A Visualization and Explanation Tool for Debugging ECA Rules in Active Database (1995)
Chakravarthy Tamizuddin Zhou, S. Chakravarthy, Z. Tamizuddin, J. Zhou
. Using ECA rules in active database systems for real-life applications involves implementing, debugging, and maintaining large numbers of rules. Experience in developing large production rule...
Time Issues in Advanced Workflow Management Applications of Active Databases (1995)
H. Jasper, O. Zukunft, S. Chakravarthy, S. Adler (ed, ...
Workflow management systems schedule tasks in accordance with previously known process types. Additionally, advanced workflow applications have to deal with parametric processes and exceptional...
Alternative Version Concurrency Control (AVCC) for firm real-time database system (1995)
D. Hong, S. Chakravarthy, T. Johnson
By definition, firm real-time transactions are discarded when they miss their deadlines, as there is no value to completing them after they miss their deadlines. Several approaches that exploit the...
Realizing Transaction Models: An Extensible Approach using ECA Rules (1995)
E. Anwar, E. Anwar, S. Chakravarthy, S. Chakravarthy, M. Viveros, M. Viveros
Use of databases for non-traditional applications has prompted the development of new transaction models whose semantics vary from the traditional model, as well as from each other. The...
Exploiting Active Database Paradigm For Supporting Flexible Transaction Model (1995)
The emergence of non-traditional applications such as CAD/CIM, workflow management, and cooperating tasks reveal the limitations of the traditional transaction model. Specifically, the traditional...
A Confluent Rule Execution Model for Active Databases (1995)
In this paper we propose a new rule execution model along with priority specification schemes to achieve confluent rule execution in active databases. Our model employs prioritization to resolve...
A discrete single server queue with Markovian arrivals and phase type group services (1995)
Attahiru Sule Alfa, K. Laurie Dolhun, S. Chakravarthy
We consider a single-server discrete queueing system in which arrivals occur according to a Markovian arrival process. Service is provided in groups of size no more than M customers. The service...
Incorporating Load Factor into the Scheduling of Soft Real-Time Transactions (1994)
S. Chakravarthy, D. Hong, T. Johnson
In real-time databases (as opposed to real-time systems), transactions must satisfy the ACID properties in addition to satisfying the timing constraints specified for each transaction (or task)....
ECA Rule Integration into an OODBMS: Architecture and Implementation (1994)
S. Chakravarthy, V. Krishnaprasad, Z. Tarnizuddin, R. H. Badani
Making a database system active entails not only the specification of expressive ECA (eventcondition -action) rules, algorithms for the detection of composite events, and rule management, but also a...
A finite capacity queue with Markovian arrivals and two servers with group services (1994)
S. Chakravarthy, Attahiru Sule Alfa
In this paper we consider a finite capacity queuing system in which arrivals are governed by a Markovian arrival process. The system is attended by two exponential servers, who offer services in...
Composite events for active databases: Semantics, contexts, and detection (1994)
S. Chakravarthy, V. Krishnaprasad, E. Anwar
Making a database system active entails developing an expressive event specification language with well-defined semantics, algorithms for the detection of composite events, and an architecture for an...
A Formal Approach to the Vertical Partitioning Problem in Distributed Database Design (1993)
J. Muthuraj, S. Chakravarthy, R. Varadarajan, S. B. Navathe
The design of distributed databases is an optimization problem requiring solutions to several interrelated problems: data fragmentation, allocation, and local optimization. Each problem can be solved...
Real-Time Transaction Scheduling : A Cost Conscious Approach (1993)
D. Hong, T. Johnson, S. Chakravarthy
Real-time databases are an increasingly important component of embedded realtime systems. In a real-time database context, transactions must not only maintain the consistency constraints of the...
A New Perspective on Rule Support for Object-Oriented Databases (1993)
E. Anwar, Anwar Maugis, S. Chakravarthy
This paper proposes a new approach for supporting reactive capability in an objectoriented database. We introduce an event interface, which extends the conventional object semantics to include the...
Design and Implementation of Active Capability for an Object-Oriented Database (1993)
Chakravarthy Anwar, S. Chakravarthy, E. Anwar, L. Maugis
This paper describes a design and its implementation of active capability for object-oriented databases. Differences between the relational and the object-oriented data models necessitate...
A Federated Multi-media DBMS for Medical Research : Architecture and Functionality (1993)
Chakravarthy Krishnaprasad Tamizuddin, S. Chakravarthy, V. Krishnaprasad, Z. Tamizuddin, F. Lambay
This paper identifies two critical problems in providing Database Management System support for medical research environments in general and for research requirements of individual disciplines. The...
A Comparative Evaluation of Active Relational Databases (1993)
Chakravarthy Email Sharma, S. Chakravarthy, S. Chakravarthy
Over the past few years, active databases have become an important area of research. A number of efforts have addressed event-condition-action (ECA) rule support in the context of relational...
A Federated Multi-media DBMS for Medical Research : Architecture and Functionality (1993)
Chakravarthy Krishnaprasad Tamizuddin, S. Chakravarthy, V. Krishnaprasad, Z. Tamizuddin, F. Lambay
This paper identifies two critical problems in providing Database Management System support for medical research environments in general and for research requirements of individual disciplines. The...
Anatomy of a Composite Event Detector (1993)
S. Chakravarthy, V. Krishnaprasad, E. Anwar
Making a database system active entails developing an expressive event specification language with well-defined semantics, algorithms for the detection of composite events, and an architecture for an...
A Comparative Evaluation of Active Relational Databases (1993)
S. Chakravarthy, S. Chakravarthy
Over the past few years, active databases have become an important area of research. A number of efforts have addressed event-condition-action (ECA) rule support in the context of relational...
Lipodystrophia centrifugalis abdominalis infantalis (1992)
Balachandran, C, Srinivas, C, Shenoi, S, Chakravarthy, S, Ali, S
W. K. Whang, S. Chakravarthy, S. B. Navathe
The need for accessing independently developed database management systems using a unified conceptual view has been well-recognized. View or schema integration is an important component of this...
Database Supported Cooperative Problem Solving (1992)
S. Chakravarthy, K. Karlapalem, S. B. Navathe, A. Tanaka, Kamalakar Karlapalem, Shamkant B. Navathe, ...
There are a number of problems in office environments, medical diagnosis, and planning that require cooperation among agents (either active or passive) for their solutions. Briefly, cooperative...
ActiveData/Knowledge Base Research At The University of Florida (1992)
Introduction A number of research projects addressing various issues on active data/knowledge bases are currently underway at the University of Florida. The Sentinel project focuses on the research,...
Maria, B. L., Lambay, F. A., Dankel, D., Chakravarthy, S., Tufekci, S., Marcus, R., ...
The treatment of brain tumors requires a large team of medical experts. However, the process of medical decision-making for these patients is hampered by the frequent inaccessibility of the experts...