http://www.eecs.ucf.edu/~dcm/Teaching/COT4810-Spring2011/Literature/SensorNetworksSurvey.pdf

Wireless sensor networks: a survey

http://www.csun.edu/~andrzej/COMP529-S05/papers/Mesh%20Networks%20Survey.pdf

Wireless mesh networks: a survey

In the last years, wireless sensor networks (WSNs) have gained increasing attention from both the research community and actual users. As sensor nodes are generally battery-powered devices, the critical aspects to face concern how to reduce the energy consumption of nodes, so that the network lifetime can be extended to reasonable times. In this paper we first break down the energy consumption for the components of a typical sensor node, and discuss the main directions to energy conservation in WSNs. Then, we present a systematic and comprehensive taxonomy of the energy conservation schemes, which are subsequently discussed in depth. Special attention has been devoted to promising solutions which have not yet obtained a wide attention in the literature, such as techniques for energy efficient data acquisition. Finally we conclude the paper with insights for research directions about energy conservation in WSNs.

/pdf/energy-conservation-in-wireless-sensor-networks-a-survey-1bl7d2obnm.pdf

Energy conservation in wireless sensor networks: A survey

The objective of this paper is to give a comprehensive introduction to applied cryptography with an engineer or computer scientist in mind. The emphasis is on the knowledge needed to create practical systems which supports integrity, confidentiality, or authenticity. Topics covered includes an introduction to the concepts in cryptography, attacks against cryptographic systems, key use and handling, random bit generation, encryption modes, and message authentication codes. Recommendations on algorithms and further reading is given in the end of the paper. This paper should make the reader able to build, understand and evaluate system descriptions and designs based on the cryptographic components described in the paper.

[서평]「Applied Cryptography」

Energy harvesting generators are attractive as inexhaustible replacements for batteries in low-power wireless electronic devices and have received increasing research interest in recent years. Ambient motion is one of the main sources of energy for harvesting, and a wide range of motion-powered energy harvesters have been proposed or demonstrated, particularly at the microscale. This paper reviews the principles and state-of-art in motion-driven miniature energy harvesters and discusses trends, suitable applications, and possible future developments.

/pdf/energy-harvesting-from-human-and-machine-motion-for-wireless-3lsf4oudvo.pdf

Energy Harvesting From Human and Machine Motion for Wireless Electronic Devices

Utilizing the latest neural engineering developments, researchers have enabled biobotic insects that function as search-and-rescue agents to help map under-rubble environments and locate survivors and hazardous conditions The Web extra at http://youtube/oJXEPcv-FMw is a video in which authors Alper Bozkurt, Edgar Lobaton, and Mihail Sichitiu demonstrate the acoustic steering of roach biobots to search for disaster victims trapped under rubble

A Biobotic Distributed Sensor Network for Under-Rubble Search and Rescue

A new, more realistic model for the available bit rate traffic class in ATM network congestion control with explicit rate feedback is introduced and analyzed. This model is based on recent results by M.M. Ekanayake ("Robust stability of discrete time nonlinear systems", Ph.D. dissertation, Univ. Miami, Coral Gables, FL, 1999) regarding discrete time models for time-variant delays. The discrete time model takes into account the effect of time-variant buffer occupancy levels of ATM switches, thus treating the case of time-variant delays between a single congested node and the connected sources. For highly dynamic situations, such a model is crucial for a valid analysis of the resulting feedback system. The new model also handles the effects of the mismatch between the resource management cell rates and the variable bit rate controller sampling rate as well as buffer and rate nonlinearities. A brief stability study shows that an equilibrium in the buffer occupancy is impossible to achieve in the presence of time-variant forward path delays. Stability conditions for the case of time-variant delays in the return path are presented. Finally, illustrative examples are provided.

The effect of uncertain time-variant delays in ATM networks with explicit rate feedback: a control theoretic approach

Network simulators emerged as the most common method of evaluating the performance of large and complex networking systems. However, for systems involving mobile nodes, the movement of the mobile nodes has a significant influence on the results of the simulation. Therefore, in the past decade, a significant amount of research was devoted to develop mobility models suitable for evaluating the performance of wireless networks. Existing mobility models vary widely in their realism, from completely artificial to very realistic as well as in their statistical properties. In this chapter we provide an overview of those mobility models and their most important properties.

Mobility Models for Ad Hoc Networks

. Numerous protocols for geocast have been proposed in lit-erature. It has been shown that explicit route setup approaches per-form poorly with VANETs due to limited route lifetime and frequent network fragmentation. The broadcast based approaches have considerable redundancy and add signiﬁcantly to the overhead of the protocol. A completely distributed and robust geocast approach is presented in this paper, that is resilient to frequent topology changes and network fragmentation. A distance-based backoﬀ algorithm is used to reduce the number of hops and a novel mechanism to reduce redundant broadcasts is introduced. The performance of the proposed protocol is evaluated for various scenarios and compared with simple ﬂooding and a protocol based on explicit route setup.

Distributed Robust Geocast Multicast Routing for Inter-Vehicle Communication

On a wired network, physical authentication is implicitly provided by access: if a user is able to plug a cable into a network socket, he must have cleared other security checks such as the receptionist and/or locked doors. In the case of a wireless local area network (WLAN), the signal propagation is not limited by a fixed boundary, and unauthorized access from outside the security perimeter is possible, and in many instances facile. In this paper, we present a probabilistic technique for localization of users in a WLAN. The presented technique is able to identify intruders based on their location, and thus successfully defend a "parking lot" attack. The approach relies on a probabilistic mapping from received signal strength (RSSI) to location. Calibration inside and around the security perimeter must precede the localization phase. During the localization phase, the RSSI of all the WLAN users is measured by multiple monitoring stations positioned to provide an overlapping coverage of the area (the access points needed to provide the WLAN coverage can double as monitoring stations). A Bayesian technique is used to estimate the location of the unsuspecting mobile user, and the position estimate of each user is updated with every new RSSI measurement at any of the monitoring stations. The presented approach is server-based, i.e., it works without the knowledge or cooperation of the user being tracked, thereby enabling the proposed security application, as well as location-aware services. Validation of the concepts was implemented using an experimental testbed in an office environment. The results demonstrate the ability of the proposed technique to estimate the user location to a very high degree of accuracy

Mihail L. Sichitiu

Papers

A Biobotic Distributed Sensor Network for Under-Rubble Search and Rescue

The effect of uncertain time-variant delays in ATM networks with explicit rate feedback: a control theoretic approach

Mobility Models for Ad Hoc Networks

Distributed Robust Geocast Multicast Routing for Inter-Vehicle Communication

Physical authentication through localization in wireless local area networks