| AIDA: Adaptive Application Independent Data Aggregation in Wireless Sensor Networks |
07 SEP 2005 |
24 pages |
| Authors:
Tian He; Brian M. Blum; John A. Stankovic; Tarek Abdelzaher; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
 | Sensor networks, a novel paradigm in distributed wireless communication technology, have been proposed for use in various applications including military surveillance and environmental monitoring. These systems could deploy heterogeneous collections of sensors capable of observing and reporting on various dynamic properties of their surroundings in a time sensitive manner. Such systems suffer bandwidth, energy, and throughput constraints that limit the quantity of information transferred from end to end. These factors ... |
|
| On Computer Viral Infection and the Effect of Immunization |
07 SEP 2005 |
23 pages |
| Authors:
Chenxi Wang; John C. Knight; Matthew C. Elder; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
| Viruses remain a significant threat to modern networked computer systems. Despite the best efforts of those who develop anti-virus systems, new viruses and new types of virus that are not dealt with by existing protection schemes appear regularly. In addition, the rate at which a virus can spread has risen dramatically with the increase in connectivity. Defenses against infections by known viruses rely at present on immunization yet, for a ... |
|
| Automatically Hardening Web Applications Using Precise Tainting |
07 SEP 2005 |
|
| Authors:
Anh Nguyen-Tuong; Salvatore Guarnieri; Doug Greene; David Evans; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
 | Most web applications contain security vulnerabilities. The simple and natural ways of creating a web application are prone to SQL injection attacks and cross-site scripting attacks (among other less common vulnerabilities). In response, many tools have been developed for detecting or mitigating common web application vulnerabilities. Existing techniques either require effort from the site developer or are prone to false positives. This paper presents a fully automated approach to securely ... |
|
| Selective Notification: Combining Forms of Decoupled Addressing for Internet-Scale Command and Alert Dissemination |
07 SEP 2005 |
23 pages |
| Authors:
Jonathan C. Hill; John C. Knight; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
| By using an information survivability control system, the survivability of critical networked information systems can be enhanced using a variety of fault-tolerance mechanisms. Essential to the effective implementation of such mechanisms is communication from the error detection component to the various application nodes in the network. In this paper, we introduce a technique called Selective Notification for the communication of commands and alerts in very large distributed systems. The technique ... |
|
| SPEED: A Stateless Protocol for Real-Time Communication in Sensor Networks |
07 SEP 2005 |
11 pages |
| Authors:
Tian He; John A. Stankovic; Chenyang Lu; Tarek Abdelzaher; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
| In this paper, we present a real-time communication protocol for sensor networks, called SPEED. The protocol provides three types of real-time communication services, namely, real-time unicast, real-time area-multicast and real-time area-anycast. SPEED is specifically tailored to be a stateless, localized algorithm with minimal control overhead. End-to-end soft real-time communication is achieved by maintaining a desired delivery speed across the sensor network through a novel combination of feedback control and non-deterministic ... |
|
| RAP: A Real-Time Communication Architecture for Large-Scale Wireless Sensor Networks |
07 SEP 2005 |
13 pages |
| Authors:
Chenyang Lu; Brian M. Blum; Tarek F. Abdelzaher; John A. Stankovic; Tian He; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
| Large-scale wireless sensor networks represent a new generation of real-time embedded systems with significantly different communication constraints from traditional networked systems. This paper presents RAP, a new real-time communication architecture for largescale sensor networks. RAP provides convenient, highlevel query and event services for distributed microsensing applications. Novel location-addressed communication models are supported by a scalable and light-weight network stack. We present and evaluate a new packet scheduling policy called velocity ... |
|
| Microarchitectural Floorplanning for Thermal Management: A Technical Report |
20 MAY 2005 |
12 pages |
| Authors:
Karthik Sankaranarayanan; Sivakumar Velusamy; Kevin Skadron; Mircea Stan; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
| In current day microprocessors, exponentially increasing power densities, leakage, cooling costs, and reliability concerns have resulted in temperature becoming a first class design constraint like performance and power. Hence, virtually every high performance microprocessor uses a combination of an elaborate thermal package and some form of Dynamic Thermal Management (DTM) scheme that adaptively controls its temperature. While DTM schemes exploit the important variable of power density to control temperature, this ... |
|
| Range-Free Localization Schemes for Large Scale Sensor Networks |
01 MAR 2003 |
17 pages |
| Authors:
Tian He; Chengdu Huang; Brain M. Blum; John A. Stankovic; Tarek Abdelzaher; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
| Wireless Sensor Networks have been proposed for a multitude of location-dependent applications. For such systems, the cost and limitations of hardware on sensing nodes prevent the use of range-based localization schemes that depend on absolute point-to-point distance estimates. Because coarse accuracy is sufficient for most sensor network applications, solutions in range-free localization are being pursued as a cost-effective alternative to more expensive range-based approaches. In this paper, we present APIT, ... |
|
| SPEED: A Real-Time Routing Protocol for Sensor Networks |
01 MAR 2002 |
13 pages |
| Authors:
Tian He; John A. Stankovic; Chenyang Lu; Tarek Abdelzaher; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF COMPUTER SCIENCE
|
| In this paper, we present a real-time communication protocol, called SPEED, for sensor networks. The protocol provides three types of real-time communication services, namely, real-time unicast, real-time area-multicast and real-time area-anycast. SPEED is specifically tailored to be a stateless, localized algorithm with minimal control overhead. End-to-end real-time communication guarantees are achieved using a novel combination of feedback control and non-deterministic QoS-aware geographic forwarding with a bounded hop count. SPEED is ... |
|
Reports by Corporate Author
