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A calibrated delay line is a key component in many modern digital systems. Traditionally, these lines are designed as real-time pipelines with static granularity, fine enough to handle a worst-case input rate. However, due to their rigid structure, they have sub-optimal energy for low- and varying-rate input streams. We introduce a complete methodology for designing reconfigurable delay lines which...
With the increasing economic development, the number of cars in the city has been increasing continuously. Though some RFID parking lot management systems have been set up, most rely on manual management and efficiency is very low. The major cause is that a well information communication system is not built between the parking lot manager and the parking spaces. In order to solve the problem, a scheme...
This paper presents an integrated multichannel neurostimulator ASIC with improved power management efficiency. The stimulator features transcutaneous closed-loop power control that enables optimum power transfer in spite of the coupling variation as well as the variation in the stimulation threshold/current. A programmable adaptive supply in the high voltage (HV) domain is further proposed to minimize...
Wireless sensor networks (WSN) is considered an effective technique to collect oil and gas transmission pipeline information. The studies that use conventional technologies (such as GPRS, microwave, radio modem and cables etc.) to collect these pipelines state information have the disadvantages of high cost of system maintenance and long data packet delay. The usage of WSN in oil and gas pipeline...
ZigBee wireless technology is a global standard of short-range and low-data-rate for wireless sensor networks. To reduce the redundant overhead and to conserve nodes' energy in energy-constrained and multi-PAN ZigBee networks, we propose in this paper a cross-layer energy-balanced inter-PAN routing algorithm (CEIPR). The proposed algorithm has three key functionalities: (1) establishes the multipath...
There have been a number of network monitoring projects launched to cope with cyber threats in the Internet. In those projects, several types of sensors such as black hole sensor, low and high interaction honey pot, and web crawlers are deployed to analyze characteristics of attackers from various perspectives. However, there are some problems of deployment and operation of network monitoring systems,...
Given the high uncertainty in the dynamics of Wireless Sensor Networks (WSN), it is essential to monitor the Quality-of-Service metrics in order to find the links with poor characteristics. This would allow to implement fault-tolerant protocols to reroute the control packets and avoid zones with untrusted links. However, network monitoring is not used as a permanent analysis tool. This is due both...
A complex software system may have hundreds of tuning parameters with both itself and its runtime environments. To perform optimally at runtime, a self-adaptive system often needs to employ a series of controllers to tune different parameters. In most cases, these parameters are not independent but interact with each other, thus demanding effective coordination among different controllers. Due to...
Near Field Communication (NFC) is one of the technologies, in conjunction with Bluetooth and 6LoWPAN, which makes feasible the wireless transmission of information from small objects and sensors to Internet-enabled devices. This presents a new technological generation, denominated Internet of Things (IoT), which is able to integrate in Internet the sensors and objects located surround us. Our research...
Lazy controllers are a class of execution monitors that do not continuously observe the behaviour of their target. Monitors are activated and deactivated according to a scheduling strategy. When a lazy controller is activated, it checks the current security state and, in case of a violation, terminates the execution. Instead, if the current execution trace is safe, the monitor is suspended and its...
Nowadays, due to wide applicability of Wireless Sensor Network (WSN) added by the low cost sensor devices, its popularity among the researchers and industrialists are very much visible. A substantial amount of works can be seen in the literature on WSN which are mainly focused on application specific WSN considering its resource constraints, neglecting the return-of-investment and usefulness of the...
Achieving accurate, cost-efficient, and fast anomaly localization is a highly desired feature in computer networks. Prior works, examining the problem of single link-level anomaly localization, have claimed that a necessary condition for localizing anomalies unambiguously is to deploy resources that enable the monitoring of a set of paths distinguishing between all links of the network pairwise. In...
We examine the problem of computing the worst-case first-to-first information propagation delay through a sequence of fixed-priority periodic tasks with different periods. This propagation delay is the span of time from the moment information becomes available until the first time the final task in the sequence produces an output that uses this (or more recent) input. We consider task systems in which...
As military, academic, and commercial computing systems evolve from autonomous entities that deliver computing products into network centric enterprise systems that deliver computing as a service, opportunities emerge to consolidate computing resources, software and information through cloud computing. Along with these opportunities come challenges, especially to service providers and operations centers...
The Gas sensors are used to detect several hazardous gases from burning smoke, fumes (soldering) and etc. Presently, the electronics sensors are playing important role in the detection of various physical parameters. These sensors have got enormous contribution towards the research in the field of mining domain. This work contributes to the design & application of analytic devices and circuits,...
Increased commodity use of mobile devices has the potential to enable mission-critical monitoring applications. However, these mobile-enabled monitoring applications have to often work in environments where a delay-tolerant network (DTN) is the only feasible communication paradigm. Detection of complex (composite) events is fundamental to monitoring applications. However, the existing plan-based CED...
Delay tolerant networks (DTNs), which are wireless networks prone to long delays and frequent disruptions are increasingly becoming common. We are exploring the challenges involved in designing effective event notification framework on DTNs. This paper presents the design and evaluation of a delay-tolerant event notification framework called DATEM based on the philosophy that failures and delays are...
Wildlife sounds provide relevant information for non-intrusive environmental monitoring when Wireless Sensor Networks (WSNs) are used. Thus, collecting such audio data, while maximizing the network lifetime, is a key challenge for WSNs. In this work, we propose a methodology that applies Compressive Sensing (CS) aiming at collecting as little data as possible to allow the signal reconstruction, so...
With the increasing demand for traffic safety and efficiency and constant search for innovative solutions within the automotive market coupled with supporting initiatives from regulatory (governmental) domains, the potential of Intelligent Transportation Systems (ITS) is vast. Basic vehicle and roadside infrastructure collaboration allows an increase in efficiency and safety and acts as the foundation...
Data centers are nowadays ubiquitous, in a worldwide scale, and often geographically dispersed. In such environments, data reliability and availability are enhanced via data redundancy throughout the distributed storage. Because user performance is important in data centers, data updates in such distributed environments are done such that eventual consistency is achieved. In this paper we utilize...
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