A few recent papers augment routing protocols of mobile ad-hoc networks (MANET) in order to enable discovery of physical resources (see [1]). However, the existing work does not distinguish between...
MOBI-DIC: MOBIle DIscovery of loCal Resources in Peer-to-Peer Wireless Network £ (2008)
Hu Cao, Ouri Wolfson, Bo Xu, Huabei Yin
In this paper we examine management of databases distributed among moving objects. The objects are interconnected by a Mobile Ad Hoc Network. Several inherent characteristics of this environment,...
John F. Dillenburg, Ouri Wolfson, Peter C. Nelson
Abstract-- The ultimate goal of the Intelligent Travel Assistant (ITA) is the fusion and development of a number of technologies into a device that will increase the efficiency of our transportation...
Ouri Wolfson, Goce Trajcevski, Xin Li
• Line simplification reduces the number of points while preserving the basic “shape ” of trajectories. • Two types of line simplification: – Strong: Use existing vertices – Weak: Don’t...
Spatial information Temporal information Moving objects databases Location management (2008)
Where closest gas station? How do I get there? Track my pet/kid/bus Send coupon when "right " client close to store Ride-sharing: Share the cab with a waiting customer What is the...
Accuracy and resource consumption in tracking and location prediction (2008)
Abstract. Tracking is an enabling technology for many location based services. Given that the location of a moving object changes continuously but the database cannot be updated continuously, the...
Processing of Data Streams with Prediction Functions (2008)
Sergio Ilarri, Ouri Wolfson, Eduardo Mena, Arantza Illarramendi, Naphtali Rishe
Networks of sensors arise naturally in many different fields, from industrial applications (e.g., monitoring of environmental parameters in a chemical plant) to surveillance applications (e.g.,...
Mohamed F. Mokbel, Walid G. Aref, Hu Cao, Ouri Wolfson, Bo Xu, Huabei Yin, ...
The Bulletin of the Technical Committee on Data Engineering is published quarterly and is distributed to all TC members. Its scope includes the design, implementation, modelling, theory and...
Hu Cao, Ouri Wolfson, Goce Trajcevski
Abstract A common way of storing spatio-temporal information about mobile devices is in the form of a 3D (2D geography + time) trajectory. We argue that when cellular phones and Personal Digital...
ABSTRACT On-line Data Reduction and the Quality of History in Moving Objects Databases (2008)
Goce Trajcevski, Hu Cao, Ouri Wolfson, Dennis Vaccaro, Peter Scheuermann
In this work we investigate the quality bounds for the data stored in Moving Objects Databases (MOD) in the settings in which mobile units can perform an on-board data reduction in real time. It has...
A. Prasad Sistla Abstract Modeling and Querying Moving Objects (2008)
In this paper we propose a data model for representing moving objects in database systems. It is called the Moving Objects Spatio-Temporal (MOST) data model. We also propose Future Temporal Logic...
Mobile Peer-to-peer Data Dissemination with Resource Constraints 1 (2008)
Ouri Wolfson, Bo Xu, R. Michael Tanner
Peer-to-peer data dissemination in a mobile ad-hoc environment is characterized by three resource constraints, including energy, communication bandwidth, and storage. Most of the existing studies...
Processing of Data Streams with Prediction Functions (2008)
Sergio Ilarri, Ouri Wolfson, Eduardo Mena, Arantza Illarramendi, Naphtali Rishe
Networks of sensors arise naturally in many different fields, from industrial applications (e.g., monitoring of environmental parameters in a chemical plant) to surveillance applications (e.g.,...
On Database Integration over Intelligent Networks * (2008)
Naphtali Rishe, Jun Yuan, Jinyu Meng, Shu-ching Chen, Ouri Wolfson
The advent of intelligent network technology has brought a kind of new challenge to the database community, especially on the heterogeneous database integration techniques. These advances in public...
Soumitra Sengupta, Er Dupuy, Jed Schwartz, Ouri Wolfson, Yechiam Yemini
The Network Management, Analysis, and Testing Environment (NetMATE) project addresses research as well as pragmatic issues related to distributed network management of large, heterogeneous networks....
Towards a Theory of Cost Management for Digital Libraries (2007)
Prasad Sistla Ouri, A. Prasad Sistla, Ouri Wolfson, Yelena Yesha, Robert Sloan
One of the features that distinguishes digital libraries from traditional databases is new cost models for client-access to intellectual property. Clients will pay for accessing data items in digital...
Parallel Processing of Graph Reachability in Databases (2007)
Ouri Wolfson, Weining Zhang, Harish Butani, Akira Kawaguchi, Kui Mok
In this paper we consider parallel processing of a graph represented by a database relation, and we achieved two objectives. First, we propose a methodology for analyzing the speedup of a parallel...
IRI-9712967. Steiner-Optimal Data Replication in Tree Networks (2007)
Ouri Wolfson S, Konstantinos Kalpakis, Konstantinos Kalpakis, Koustuv Dasgupta, Koustuv Dasgupta, Ouri Wolfson
We consider the problem of placing copies of objects in a tree network in order to minimize the cost of servicing read and write requests to objects when the tree nodes have limited storage and the...
Ouri Wolfson, Prasad Sistla, Bo Xu, Jutai Zhou, Sam Chamberlain, Yelena Yesha, ...
Consider a database that represents information about moving objects and their location. For example, for a database representing the location of taxi-cabs a typical query may be: retrieve the free...
Benefit and pricing of spatio-temporal information in Mobile Peer-to-Peer networks (2006)
In this paper we examine the dissemination of reports about resources in mobile peer-to-peer networks, where moving objects communicate with each other via short-range wireless transmission. Each...
Nonmaterialized Motion Information in Transport Networks (2005)
Abstract. The traditional way of representing motion in 3D space-time uses a trajectory, i.e. a sequence of (x,y,t) points. Such a trajectory may be produced by periodic sampling of a Global...
Applications of Moving Objects Databases (2005)
Miniaturization of computing devices and advances in wireless communication and sensor technology are some of the forces propagating computing from the stationary desktop to the mobile outdoors. Some...
A weight-based map matching method in moving objects databases (2004)
In location management, the trajectory represents the motion of a moving object in 3D space-time, i.e., a sequence (x, y, t). Unfortunately, location technologies, cannot guarantee error-freedom....
Cat: Correct answers of continuous queries using triggers (2004)
Goce Trajcevski, Peter Scheuermann, Ouri Wolfson, Nimesh Nedungadi
Consider the query Q1: Retrieve all the motels which will be no further then 1.5 miles from my route, sometime between 7:00PM and 8:30PM, which a mobile user posed to the Moving Objects Database...
Abstract. In this paper we examine the database management of spatiotemporal resource information in mobile peer-to-peer networks, where moving objects communicate with each other via short-range...
In this paper we examine the dissemination of availability reports about resources in mobile peer-topeer networks, where vehicles, pedestrian or sensors communicate with each other via short-range...
Applications of a Transportation Information Architecture (2004)
John F. Dillenburg, Peter C. Nelson, Ouri Wolfson, Oliver Yu, Aravinda Prasad Sistla, Aris M. Ouksel, ...
Abstract---Basic research in information management, software architecture, human factors, traffic prediction and transportation planning is necessary to manage the integration of millions of...
The geometry of uncertainty in moving objects databases (2002)
Goce Trajcevski, Ouri Wolfson, Fengli Zhang, Sam Chamberlain
Abstract. This work addresses the problem of querying moving objects databases. which capture the inherent uncertainty associated with the location of moving point objects. We address the issue of...
Real-time traffic updates in moving objects databases (2002)
Goce Trajcevski, Ouri Wolfson, Bo Xu, Peter Nelson
Abstract This work addresses the problem of updating MovingObjects Databases (MOD) using real-time traffice information. The motion of the object is represented by a trajectory,which can be...
Cost Based Data Dissemination in Satellite Networks (2002)
We consider the problem of data dissemination in a satel-lite network. In contrast to previously studied models, broadcasting is among peers, rather than client server. We introduce a cost model for...
Moving objects information management: The database challenge (2002)
Abstract Miniaturization of computing devices, and advances in wireless communication and sensor technology are some of the forces that are propagating computing from the stationary desktop to the...
Managing Uncertain Trajectories of Moving Objects with DOMINO (2002)
Goce Trajcevski, Ouri Wolfson, Cao Hu, Hai Lin, Fengli Zhang, Naphtali Rishe Ý
several novelties to the problem of managing moving objects databases. Our robust model of a trajectory captures the inherent parameter of uncertainty of the moving objects location, which impacts...
Research activities in database management and information retrieval at (2002)
Isabel Cruz, Ashfaq Khokhar, Bing Liu, Prasad Sistla, Ouri Wolfson, Clement Yu
There are 6 active researchers in the areas of database
Modeling moving objects for location based services. invited paper (2001)
Ouri Wolfson, Sam Chamberlain, Kostas Kalpakis, Yelena Yesha
Abstract. As prices of basic enabling equipment like smart cell phones, hand holds, wireless modems, and GPS devices continue to drop rapidly, International Data Corp (IDC) predicts that the number...
A spatiotemporal model and language for moving objects on road networks (2001)
Michalis Vazirgiannis, Ouri Wolfson
Abstract. Moving object databases are becoming more popular due to the increasing number of application domains that deal with moving entities and need to pose queries. So far implementations of such...
Location Prediction and Queries for Tracking Moving Objects (2000)
Ouri Wolfson, Bo Xu, Sam Chamberlain
Consider a database that represents information about moving objects and their location. For example, for a database representing the location of taxi-cabs a typical query may be: retrieve the free...
Approximate retrieval from multimedia databases using relevance feedback (1999)
Ana Lelescu, Ouri Wolfson, Electrical Engineering, Computer Science
DOMINO: Databases fOr MovINg Objects tracking (1999)
Ouri Wolfson, Prasad Sistla, Bo Xu, Jutai Zhou, Sam Chamberlain
Consider a database that represents information about moving objects and their location. For example, for a database representing the location of taxi-cabs a typical query may be: retrieve the free...
Databases for Tracking Mobile Units in Real Time (1999)
Ouri Wolfson, Liqin Jiang, A. Prasadsistla, Sam Chamberlain, Naphtali Rishe, Minglin Deng
Abstract. In this paper we consider databases representing information about moving objects (e.g. vehicles), particularly their location. We address the problems of updating and querying such...
Approximate retrieval from multimedia databases using relevance feedback (1999)
Ouri Wolfson, Ana Lelescu, Bo Xu
In this paper we address the problem of retrieving stored multimedia presentations using relevance feedback. The multimedia presentations may be produced by collaborative work. We introduce a model...
Databases for Tracking Mobile Units in Real Time (1999)
Ouri Wolfson, Liqin Jiang, A. Prasadsistla, Sam Chamberlain, Naphtali Rishe, Minglin Deng
Abstract. In this paper we consider databases representing information about moving objects (e.g. vehicles), particularly their location. We address the problems of updating and querying such...
An Algorithm for Dynamic Data Distribution Preliminary Version. (1998)
Wolfson, Ouri, Jajodia, Sushil
The replication scheme of a distributed database determines how many replicas of each object are created, and to which processors these replicas are allocated. This scheme critically affects the...
Active Heterogeneous Databases for Monitor and Control. (1998)
Wolfson, Ouri, Sistla, A. P., Yu, Clement
As part of this project, a rule based declarative trigger language employing temporal logic has been developed. This language facilitates monitoring of the evolution of a database over time. and...
Towards a Theory of Cost Management for Digital Libraries (1998)
A. Prasad Sistla, Ouri Wolfson, Yelena Yesha, Robert Sloan
ing with credit is permitted. To copy otherwise, to republish, to post on servers, to redistribute to lists, or to use any component of this work in other works, requires prior specific permission...
Querying the Uncertain Position of Moving Objects (1998)
Prasad Sistla, Ouri Wolfson, Sam Chamberlain, Son Dao
In this paper we propose a data model for representing moving objects with uncertain positions in database systems. It is called the Moving Objects Spatio-Temporal (MOST) data model. We also propose...
Towards a Theory of Cost Management for Digital Libraries (1998)
Prasad Sistla, Ouri Wolfson, Yelena Yesha, Robert Sloan
ing with credit is permitted. To copy otherwise, to republish, to Post on servers, or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from Publications...
Cost and Imprecision in Modeling the Position of Moving Objects (1998)
Ouri Wolfson, Sam Chamberlain, Son Dao, Liqin Jiang, Gisela Mendez
Consider a database that represents the location of moving objects, such as taxi-cabs (typical query: retrieve the cabs that are currently within 1 mile of 33 Michigan Ave., Chicago), or objects in a...
Moving Objects Databases: Issues and Solutions (1998)
Ouri Wolfson, Bo Xu, Sam Chamberlain, Liqin Jiang
Consider a database that represents information about moving objects and their location. For example, for a database representing the location of taxi-cabs a typical query may be: retrieve the free...
Minimization of Communication Cost Through Caching in Mobile Environments (1998)
A. Prasad Sistla, A. Prasad, Ouri Wolfson, Yixiu Huang
Users of mobile computers will soon have online access to a large number of databases via wireless networks. Because of limited bandwidth, wireless communication is more expensive than wire...
An Adaptive Data Replication Algorithm (1997)
Ouri Wolfson, Sushil Jajodia, Yixiu Huang
This paper addresses the performance of distributed database systems. Specifically, we present an algorithm for dynamic replication of an object in distributed systems. The algorithm is adaptive in...
Modeling and Querying Moving Objects (1997)
Prasad Sistla, Ouri Wolfson, Sam Chamberlain, Son Dao
In this paper we propose a data model for representing moving objects in database systems. It is called the Moving Objects Spatio-Temporal (MOST) data model. We also propose Future Temporal Logic...
Data Consistency in Intermittently Connected Distributed Systems (1997)
Evaggelia Pitoura, Bharat Bhargava, Ouri Wolfson
Mobile computing introduces a new form of distributed computation in which communication is most often intermittent, low-bandwidth, or expensive, thus providing only weak connectivity. In this paper,...
Modeling and Querying Moving Objects (1997)
Prasad Sistla, Ouri Wolfson, Sam Chamberlain, Son Dao
In this paper we propose a data model for representing moving objects in database systems. It is called the Moving Objects Spatio-Temporal (MOST) data model. We also propose Future Temporal Logic...
An Architecture for Consumer-Oriented Online Database Services (1996)
Prasad Sistla, Ouri Wolfson, Son Dao, Kailash Narayanan, Ramya Raj
In this paper we introduce an architecture for online database services oriented towards consumers. We identify two types of costs--- access cost and communication cost. We demonstrate that dynamic...
Temporal Triggers in Active Databases (1995)
In this paper we propose two languages, called Future Temporal Logic (FTL) and Past Temporal Logic (PTL), for specifying temporal triggers. Some examples of trigger conditions that can be specified...
Temporal Conditions with Retroactive and Proactive Updates (1995)
Minglin Deng, A. Prasad Sistla, A. Prasad, Ouri Wolfson
In this paper, we extend the temporal rule language introduced in [1] to support pro- and retroactive updates. Such updates may cause the time when a condition is satisfied to differ from the time...
View Maintenance in Mobile Computing (1995)
Ouri Wolfson, Prasad Sistla, Son Dao, Kailash Narayanan
this paper is to outline the major issues related to maintaining personalized views in a network of fixed and mobile computers. Although the issue of view maintenance has been studied extensively in...
Temporal Triggers in Active Databases (1995)
A. Prasad Sistla, Ouri Wolfson
In this paper we propose two languages, called Future Temporal Logic (FTL) and Past Temporal Logic (PTL), for specifying temporal triggers. Some examples of trigger conditions that can be specified...
Temporal Conditions and Integrity Constraints in Active Database Systems (1995)
A. Prasad Sistla, Ouri Wolfson
In this paper, we present a unified formalism, based on Past Temporal Logic, for specifying conditions and events in the rules for active database system. This language permits specification of many...
Divergence caching in client-server architectures (1994)
Yixiu Huang, Robert H. Sloan, Ouri Wolfson
In this paper we propose a new mechanism, divergence caching, for reducing access and communication charges in accessing on-line database servers. The objective is achieved by allowing tolerant read...
Data Replication for Mobile Computers (1994)
Yixiu Huang, Prasad Sistla, Ouri Wolfson
Users of mobile computers will soon have online access to a large number of databases via wireless networks. Because of limited bandwidth, wireless communication is more expensive than wire...
Data Allocation In Mobile Computing: A Project Description (1993)
Users of mobile computers will soon have access to shared online databases via wireless networks. We are developing a system that dynamically allocates and deallocates copies of the data-items in...
An Algorithm for Dynamic Data Distribution (1992)
this paper we propose a practical algorithm, called Dynamic-Data-Allocation (DDA), that changes the replication scheme of an object (i.e. the processors which store a replica of the object)...
NETMATE: A Network Management Environment (1991)
Alexander Dupuy, Soumitra Sengupta, Ouri Wolfson, Yechiam Yemini
The Network Management, Analysis, and Testing Environment (NETMATE) project proposes the design and implementation of a comprehensive data model to address the problems in distributed network...
PARULEL: Parallel Rule Processing Using Meta-rules for Redaction (1991)
Salvatore J. Stolfo, Ouri Wolfson, Philip K. Chan, Hasanat M. Dewan, Leland Woodbury, Jason S. Glazier, ...
Although the problem of increasing the speed of rule-based programs has been studied for a long while, so far the level of parallelism achieved under various parallel processing schemes fails to meet...
Design of the Netmate Network Management System (1991)
Alexander Dupuy, Er Dupuy, Soumitra Sengupta, Ouri Wolfson, Yechiam Yemini
The Network management, analysis, and testing environment (Netmate) project addresses research and experimental issues in distributed network management of large, heterogeneous networks. This paper...
Incremental Evaluation of Rules and its Relationship to Parallelism (1991)
Ouri Wolfson, Hasanat M. Dewan, Salvatore J. Stolfo, Yechiam Yemini
Rule interpreters usually start with an initial database and perform the inference procedure in cycles, ending with a final database. In a real time environment it is possible to receive updates to...
Concurrency control using locks in distributed databases / (1984)
Thesis (Ph. D.)--New York University.
Object Allocation in Distributed Databases and Mobile Computers
This paper makes two contributions. First, we introduce a model for evaluating the performance of data allocation and replication algorithms in distributed databases. The model is comprehensive in...
Location Management in Moving Objects Databases
Ouri Wolfson, Sam Chamberlain, Son Dao, Liqin Jiang
In this paper we first introduce Moving Objects Databases and their related research problems. Then we concentrate on a particular problem, namely reducing the information cost associated with a trip...
A Competitive Dynamic Data Replication Algorithm
In this paper, we present a distributed algorithm for dynamic data replication of an object in a distributed system. The algorithm changes the replication scheme, i.e., number of replicas and their...
Divergence Caching in Client-Server Architectures
Yixiu Huang, Robert H. Sloan, Ouri Wolfson
In this paper we propose a new mechanism, divergence caching, for reducing access and communication charges in accessing on-line database servers. The objective is achieved by allowing tolerant read...
Semantic Multicast: Intelligently Sharing Collaborative Sessions
Son K. Dao, Brad Perry, Eddie C. Shek, Asha Vellaikal, Richard R. Muntz, Lixia Zhang, ...
We present novel methods for efficiently sharing the content produced during collaborative interactions among internetworked users. We introduce the concept of semantic multicast to implement a...
Updating and Querying Databases that Track Mobile Units
Ouri Wolfson, A. Prasad Sistla, Sam Chamberlain, Yelena Yesha
In this paper we consider databases representing information about moving objects (e.g. vehicles), particularly their location. We address the problems of updating and querying such databases....