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Many applications process data in which there exists a ``conservation law'' between related quantities. For example, in traffic monitoring, every incoming event, such as a packet's entering a router or a car's entering an intersection, should ideally have an immediate outgoing counterpart. We propose a new class of constraints -- Conservation Rules -- that express the semantics and characterize the...
Power, especially that consumed for storing data, and cooling costs for data centers have increased rapidly. The main applications running at data centers are data intensive applications such as large file servers or database systems. Recently, power management of the data intensive applications has been emphasized in the literature. Such reports discuss the importance of power savings. However, these...
Mobile sensors are a viable choice for providing monitoring service on a set of Points of Interest (PoIs) in a large sensing field. In some applications, each PoI should be covered periodically (sweep coverage), and the collected data should be delivered to the sink node timely (timely transmission), namely both the sensing and transmission delay constraints for each PoI should be satisfied, which...
As process technology continues to shrink, Negative Bias Temperature Instability (NBTI) has become a major reliability issue in CMOS circuits. NBTI degrades the threshold voltage of the PMOS transistor and, over time, causes the operating speed of the circuit to become slower (also known as the aging effect). In this paper, we introduce a new aging-aware Flip-Flop (FF) that is based on accurate, run-time...
In IEEE 802.16 e/m mobile broadband wireless systems, mobile subscriber stations (MSSs) are encouraged to enter the sleep mode for energy saving when end users do not have downstream or upstream traffic. To avoid service disruption of an MSS which stays in the sleep mode, IEEE 802.16 e/m specifies a two-way handshake protocol between the base station (BS) and an MSS. After performing the handshake...
IEEE 802.15.4/ZigBee sensor networks support small power consumption and node expansion compared to other network standards for WSN. Body sensor networks (BSN) require a number of sensors for sensing medical information from human body, and low power consumption to monitor a patient's status for a long time. However, ZigBee has limited bandwidth and is thus hard to support real time data transmission...
This paper proposes LBA, a lifetime balanced data aggregation scheme for asynchronous and duty cycle sensor networks under an application-specific requirement of end-to-end data delivery delay bound. In contrast to existing aggregation schemes that focus on reducing the energy consumption and extending the operational lifetime of each individual node, LBA has a unique design goal to balance the nodal...
To deal with the problem that one Power Quality Analyzer can only monitor one group of three-phase voltage and current signals, we proposed two different control circuits based on one kinds of Power Quality Analyzer designed by IEC-61000-4-30 standard that can make one Power Quality Analyze monitor Multiple signals. Then we compared characters of two different control circuits that one based on time...
MANET nodes use cooperative multi-hope packet forwarding technique hence they also perform the functionality of router. The individual nodes are constrained by resources such as battery life, limited network bandwidth and CPU cycles. To save its resources a node may deny to forward packets to others for saving the resources. This could lead to degradation of network performance. To mitigate this problem,...
Our research investigates application of cybernetic concepts to problem definition which is often considered a project's most important and difficult phase. The addition of cybernetic principles can make existing problem definition methods even more powerful. This is explained and demonstrated by enhancing Soft Systems Methodology (SSM) with several cybernetic concepts, and applying the resulting...
NoC (Network-on-Chip) has been proposed as a new solution to deal with the global communication problem of complex SoC(System-on-Chip). An evaluation tool is essential for optimizing the NoC design, through which the functionality and performance of the NoC are verified. This paper presents a coverage-driven and hierarchical NoC verification platform based on System Verilog language. It is applicable...
During peak hours, the focus of an Internet service provider (ISP) is on meeting user demand and maintaining the quality of service of a network. However this leads to under-utilization of network devices/components in different parts of the network. Since the power consumption of network devices are constant and independent of their actual workloads, the under-utilized network devices/components...
A novel line monitoring methodology based on piezoelectric transformer (PT) is proposed. The frequency range of operation and magnitude levels for voltage sensing are discussed and experimental results are presented. The experimental results show that a PT sustains high input voltages at power-line frequency and steps it down while stepping up the transient high frequency tones. Hence, an unexplored...
We demonstrate an average-power-based technique for aligning data and clock signals in consolidated tri-state multi-rate burst-mode DPSK transmitters with a simple and low-SWaP implementation.
Applications that involve client-server communication sometimes require the execution of asynchronous processes on the server side. We have created a framework for distributed object programming, called Web Objects in XML (WOX), which uses HTTP as transport protocol, XML for object representation, and provides synchronous and asynchronous communication between clients and servers. This paper presents...
Wireless mesh networks (WMNs) experience frequent link failures caused by channel interference, bandwidth demands causes severe performance degradation in WMNs. Link failure will lead to produce a sequence of disruptions to deliver the packets to the destination. To overcome this ART rerouting the traffic via an alternative path from a node whose local link is down without the need to wait until the...
The monitoring of the quality of service in a multi-domain network supervises the multi-domain service performance. A multi-domain service is a service that crosses several domains which can be managed by different providers. Since each domain can be managed with its own policies and may require confidentiality of its topology and its monitoring processes, we propose that the monitoring architecture...
Wireless Sensor Network (WSN) is a large network of sensor nodes, which operates in low power and capable of transmitting to a shorter distance with low bandwidth. It comprises of sensing unit, processing unit, memory unit, power supply and transceiver. As these sensor nodes are battery operated, the lifetime of the sensor node depends on the life of the battery. The sensor nodes in the network communicate...
In the recent years, Phasor Measurement Unit (PMU) based Wide Area Measurement System (WAMS) has been receiving ever increasing attention from the academia as well as from the industry. Power utilities have been designing and implementing WAMS to provide more intelligent monitoring, control, and protection of the power grid. In order to achieve real-time operations in the modern power systems, construction...
There has been much interest recently in improving power saving and cost efficiency by monitoring the operation status of various facilities over networks. Wireless networks, especially cellular networks, are advantageous in terms of their mobility, coverage, and scalability. However, a weak point is their low reliability due to rapid changes in available bandwidth. We fabricated a prototype of a...
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