Wireless distributed microsensor systems will enable the reliable monitoring of a variety of environments for both civil and military applications. In this paper, we look at communication protocols, which can have significant impact on... more
Cooperation among sensors. Data aggregation. 25
In this paper, we present a family of adaptive protocols, called SPIN (Sensor Protocols for Information via Negotiation), that efficiently disseminates information among sensors in an energy-constrained wireless sensor network. Nodes... more
We study two-hop communication protocols where one or several relay terminals assist in the communication between two or more terminals. All terminals operate in half-duplex mode, hence the transmission of one information symbol from the... more
We present a number of insights into information hiding. It was widely believed that public key steganography was impossible; we show how to do it. We then look at a number of possible approaches to the theoretical security of hidden... more
Conjugated dendrimers provide an excellent molecular architecture for tuning material properties for organic light emitting diodes. Here we demonstrate a modular approach allowing highly efficient fluorescent and phosphorescent emissive... more
With advanced computer technology, systems are getting larger to fulfill more complicated tasks, however, they are also becoming less reliable. Consequently, testing is an indispensable part of system design and implementation; yet it has... more
Due to the existence of multiple stakeholders with conflicting goals and policies, alterations to the existing Internet are now limited to simple incremental updates; deployment of any new, radically different technology is next to... more
We have shown experimentally, in a real-world setting, that it is possible to use two beams of incoherent radio waves, transmitted on the same frequency but encoded in two different orbital angular momentum states, to simultaneously... more
This paper proposes a vehicle-to-vehicle communication protocol for cooperative collision warning. Emerging wireless technologies for vehicle-to-vehicle (V2V) and vehicle-toroadside (V2R) communications such as DSRC [1] are promising to... more
This paper outlines opportunities and challenges in the development of next-generation embedded devices, applications and services, resulting from their increasing intelligence-it plots envisioned future directions for intelligent device... more
In this paper, we assess the state of the art of Quality of Services (QoS) support in wireless sensor networks (WSNs). Unlike traditional end-to-end multimedia applications, many non-end-to-end mission-critical applications envisioned for... more
Inter-vehicle communication (IVC) protocols have the potential to increase the safety, efficiency, and convenience of transportation systems involving planes, trains, automobiles, and robots. The applications targeted include peer-to-peer... more
Many sensor networks have been deployed to monitor Earth's environment, and more will follow in the future. Environmental sensors have improved continuously by becoming smaller, cheaper, and more intelligent. Due to the large number of... more
Computer networks have historically considered support for mobile devices as an extra overhead to be borne by the system. Recently however, researchers have proposed methods by which the network can take advantage of mobile components. We... more
We extend the computation and information sharing capabilities of networked robotics by proposing a cloud robotic architecture. The cloud robotics architecture leverages the combination of a virtual ad-hoc cloud formed by... more
Free traffic flow on a complex network is key to its normal and efficient functioning. Recent works indicate that many realistic networks possess connecting topologies with a scale-free feature: the probability distribution of the number... more
Vehicular networks are a very promising technology to increase traffic safety and efficiency and to enable numerous other applications in the domain of vehicular communication. Proposed applications for VANETs have very diverse properties... more
A multimedia communication system includes both the communication protocols used to transport the real-time data and also the distributed computing system (DCS) within which any applications using these protocols must execute. The... more
Consider a network of asynchronous processors communicating by sending messages over unreliable lines. There are many advantages to restricting all communications to a spanning tree. To overcome the possible failure of k ′<k edges, we... more
In this paper we study two problems which often occur in various applications arising in wireless sensor networks. These are the problem of reaching an agreement on the value of local variables in a network of computational agents and the... more
We present a method of generating test sequences for concurrent programs and communication protocols that are modeled as communicating nondeterministic finite state machines (CNFSMs). A conformance relation, called trace-equivalence, is... more
Feedback control systems wherein the control loops are closed through a real-time network are called networked control systems (NCSs). The insertion of the communication network in the feedback control loop makes the analysis and design... more
In this paper, we present a spatiotemporal communication protocol for sensor networks, called SPEED. SPEED is specifically tailored to be a localized algorithm with minimal control overhead. End-to-end soft real-time communication is... more
Abstract. Communication protocols are the rules that govern the communication between the differ-ent components within a distributed computer sys-tem. Since protocols are implemented in software and/or hardware, the question arises... more
In VANETs, better communication efficiency can be achieved by sacrificing security and vice versa. But VANETs cannot get started without either of them. In this paper, we propose a set of mechanisms that can actually reconcile these two... more
Latent variable techniques are pivotal in tasks ranging from predicting user click patterns and targeting ads to organizing the news and managing user generated content. Latent variable techniques like topic modeling, clustering, and... more
We propose a communication protocol stack to be used in Nostrum, our Network on Chip (NoC) architecture. In order to aid the designer in the selection process of what parts of protocols, and their respective facilities, to include, a... more
Secure communication is very important in computer networks and authentication is one of the most eminent preconditions. However, common authentication schemes are not applicable in ad hoc networks because public key infrastructures with... more
Wireless Body Area Networks (WBANs) form a new and interesting area in the world of remote health monitoring. An important concern in such networks is the communication between the sensors. This communication needs to be energy efficient... more
Industrial automation platforms are experiencing a paradigm shift. New technologies are making their way in the area, including embedded real-time systems, standard local area networks like Ethernet, Wi-Fi and ZigBee, IP-based... more
This paper proposes the Internet of Things communication framework as the main enabler for distributed worldwide health care applications. Starting from the recent availability of wireless medical sensor prototypes and the growing... more
R -rate matrix E -total rate matrix -E(s) = ∑ s ∈S R(s, s ) Probability of leaving s within t time units: 1 − e −E(s)·t Probability of transition from s to s within t time units: P(s, s , t) = R(s,s ) E(s) · (1 − e −E(s)·t ) J. Heath,... more
Wireless sensor networks (WSNs) face the challenge of ensuring end-to-end communication while operating over individually unreliable wireless links. This paper addresses channel hopping, a class of frequency diverse communication... more
Many future applications will require guarantees on network performance, such as bounds on throughput, delay, delay jitter, and reliability. To address this need, we have designed, simulated, and implemented a suite of network protocols... more
The FDDI Token Ring Protocol controls communication over fiber optic rings with transmission rates in the range of 100 megabits per second. It is intended to give guaranteed response to timecritical messages by using a "timed token"... more
With the explosive growth of the World Wide Web, some popular Web sites are getting thousands of hits per second. As a result, clients (browsers) experience slow response times and sometimes may not be able to access some Web sites at... more
The integration of distributed multimedia systems support into a communications architecture encompassing the new multiservice networks poses significatu challenges. A key observation about the new environment is that Quality of Service... more
The experimental evidence that radio techniques can be used for synthesizing and analyzing non-integer electromagnetic (EM) orbital angular momentum (OAM) of radiation is presented. The technique used amounts to sample, in space and time,... more
M odern high-speed local area networks offer great potential for communicationintensive applications, but their performance is limited by the use of traditional communication protocols, such as TCP/IP. In most cases, these protocols... more
Distributed architectures for industrial applications are a new opportunity to realize cost-effective, flexible, scalable and reliable systems. Direct interfacing of sensors and actuators to the industrial communication network improves... more
The development of lightweight sensing and communication protocols is a key requirement for designing resource constrained sensor networks. This paper introduces a set of efficient protocols and algorithms, DAM, EBAM, and EMLAM, for... more
Can Grover's algorithm speed up search of a physical region-for example a 2-D grid of size √ n× √ n? The problem is that √ n time seems to be needed for each query, just to move amplitude across the grid. Here we show that this problem... more
In this paper, we investigate the issue of error control in wireless communication networks. We review the alternative error control schemes available for providing reliable end-to-end communication in wireless environments. Through case... more
Wireless sensor networks benefit from communication protocols that reduce power requirements by avoiding frame collision. Time Division Media Access methods schedule transmission in slots to avoid collision, however these methods often... more
Communication protocols pose interesting and difficult challenges for verification technologies. The state spaces of interesting protocols are either infinite or too large for finite-state verification techniques like model checking and... more