Common Language Infrastructure (CLJ) has been introduced as a core technology of Microsoft .NET. It enables "writing in multiple languages, running in multiple platforms" by providing Virtual Execution Syste...
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Due to the increasing demand for quick time-to-market and diverse functionalities in the development of powertrain controllers, the traditional vehicle development process must be replaced with a model-based process. ...
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Since the lifetime of a battery directly impacts the lifetime of sensor networks, one of the key considerations in the design of sensor networks is the ability to maximize battery lifetime. In this paper, we present (...
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Priorities are used to resolve conflicts such as in resource sharing and in safety designs. the use of priorities has become indispensable in real-time system design such as in scheduling, synchronization, arbitration...
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Since high-quality image/video systems based on the JPEG/MPEG compression standards often require power-expensive implementations at relatively high bit-rates, they have not been widely used in low-power wireless appl...
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ISBN:
(纸本)0769523463
Since high-quality image/video systems based on the JPEG/MPEG compression standards often require power-expensive implementations at relatively high bit-rates, they have not been widely used in low-power wireless applications. To alleviate this problem, we designed, implemented, and evaluated a strategy that can adapt to different compression and transmission rates. (1) It gives important parts of an image higher priority over unimportant parts. therefore, the high-priority parts can achieve high image quality, while the low-priority parts, with a slight sacrifice of quality, can achieve huge compression rate and thus save the power/energy of a low-power wireless system. (2) We also introduce a priority-driven scheduling approach into our coding algorithm, which makes the transmission of important parts earlier with more data than other parts. through a balanced trade-off between the available time/bandwidth/power and the image quality, this adaptive strategy can satisfy users with desired images quality and lead to a significant reduction of the important parts' deadline misses.
On-demand broadcast is an attractive data dissemination method for mobile and wireless computing. In this paper, we propose a new online preemptive scheduling algorithm, called PRDS that incorporates the urgency, the ...
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this paper presents an efficient technique for placement and routing of sensors/actuators and processing units in a grid network. the driver application that we present is a medical jacket which requires an extremely ...
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ISBN:
(纸本)0769523463
this paper presents an efficient technique for placement and routing of sensors/actuators and processing units in a grid network. the driver application that we present is a medical jacket which requires an extremely high level of robustness and fault tolerance. the power consumption of such jacket is another key technological constraint. Our proposed interconnection network is a mesh of wires. A jacket made of fabric and wires would be susceptible to accidental damage via tears. By modeling the tears, we evaluate the probability of having failures on every segment of wires in our mesh interconnection network. then we study two problems of placement and routing in the sensor networks such that the fault tolerance is maximized while the power consumption is minimized. We develop efficient integer linear programming (ILP) formulations to address these problems and perform both placement and routing simultaneously. this ensures that the solution is a lower bound for both problems. We evaluate the effectiveness of our proposed techniques on a variety of benchmarks.
Recently, a new class of data-intensive applications has received wide attention. In these applications, monitoring functions can be performed by executing pre-registered transactions periodically using data from exte...
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ISBN:
(纸本)0769523463
Recently, a new class of data-intensive applications has received wide attention. In these applications, monitoring functions can be performed by executing pre-registered transactions periodically using data from external sources in the form of continuous data streams and producing updates as temporal data in the database. For this type of continuous transactions, the data access pattern has to be declared before submission. To keep the database fresh, these transactions must be processed in a timely fashion. However it is also desirable to execute other one-time transactions that may use these temporal data within their deadlines. Traditional DBMS are not designed to support such applications. the theme of this work is to propose new concurrency control protocols to process these types of transactions with competing requirements. the challenge of this work is to balance database freshness and transaction performance. Although there is a number of similar previous works in the literature, they did not consider the presence of continuous transactions and therefore the issue of data dependency between these two types of transactions is not addressed. the simulation results show that our protocols can significantly improve the performance of one-time transactions while keeping the database fresh.
there are many trials to provide an optimal route for minimum energy consumption in a wireless sensor network. Currently, however, the mechanisms to find Minimum Energy Property Graph (MEPG) do not properly take into ...
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In this paper, we propose a new approach for efficient and real-time tracking of the moving objects in sensor networks by mining the movement log. In our approach, we first conduct the hierarchical clustering to form ...
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