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Many routing protocols have advanced the Wire- less Sensor Network(WSN) paradigm with each new method offering unique ways to maximise Quality of Service(QoS) while minimising energy cost to the network. Tree routing is a well examined method with a proven record in offering a high level of service with trees constructed to fulfil a particular routing objective defined by a chosen metric. The tree...
In this paper, we consider the problem of distributed power control for multiple access channels when energy-efficiency has to be optimized. In contrast with related works, the presence of a queue at each transmitter is accounted for and globally efficient solutions are sought. To this end, a repeated game model is exploited and shown to lead to solutions which are distributed in the sense of the...
In this paper, we present a no-reference image quality assessment method, which we call BNB (an acronym for Blurriness, Noisiness, Blockiness). Our BNB method quantifies blurriness, noisiness and blockiness of a given image, which are considered three critical factors that affect users' quality of experience (QoE). The well designed BNB metrics are based on the observation that the difference between...
Many websites provide visitors with the possibility to evaluate each item on more than one criteria. A commonly used rating scale is the one to five-star rating system or similar linguistic scales. Such scales are ordinal but the symbolic or lexical semantics convey information about the strength of user references in addition to the order of rated items. We refer to such scales as discrete ordered...
WMN (Wireless Mesh Network) is a useful wireless multi-hop network with tremendous research value. A good routing mechanism for WMN can use the whole bandwidth of the network and can assure the quality of service of traffic. Through simulations we verify that the routing metric ETX (Expected Transmission Count) cannot assure good quality of wireless links. To improve the routing performance, a QoS-assured...
In spares inventory management, appropriate measurement metric of support effectiveness is needed to make choices, in order to accurately determine inventory level. Aiming at the average support probability for series system, the general mathematical expression is established. Independent failure probability of each component in the series system is presented in the base of the Markov process theory...
Local memories increase the efficiency of hardware accelerators by enabling fast accesses to frequently used data. In addition, the access latencies of local memories are deterministic which allows for more accurate evaluation of the system performance during design exploration. We have previously proposed local memories with an un-cached memory slave interface that permits program running on the...
Environmental monitoring of spatially-distributed geo-physical processes (e.g., temperature, pressure, or humidity) requires efficient sampling schemes, particularly, when employing an autonomous mobile agent to execute the sampling task. Many approaches have considered optimal sampling strategies which specialize in minimizing estimation error, while others emphasize reducing resource usage, yet...
Real-world robots commonly have to act in complex, poorly understood environments where the true world dynamics are unknown. To compensate for the unknown world dynamics, we often provide a class of models to a learner so it may select a model, typically using a minimum prediction error metric over a set of training data. Often in real-world domains the model class is unable to capture the true dynamics,...
We present a method for mending strategies for GR(1) specifications. Given the addition or removal of edges from the game graph describing a problem (essentially transition rules in a GR(1) specification), we apply a μ-calculus formula to a neighborhood of states to obtain a “local strategy” that navigates around the invalidated parts of an original synthesized strategy. Our method may thus avoid...
The cost of the great expressivity of motion planning subject to temporal logic formulae is intractability. Recent advances in sampling-based methods seem to be only applicable to “low-level” control. The problem of realizing “high-level” controllers that satisfy a temporal logic specification does not readily admit approximations, unless the notion of correctness is relaxed as might be achieved with...
Nowadays the world energy infrastructure is subjected to a progressive transformation. In fact it is already possible to notice the growing number of distributed small generation units, based on different technologies, directly connected to the power grid. At present the energy that can be produced by the sun and wind seem to be the most promising renewable energy sources. The use of the solar energy...
Benchmark suites are significant for evaluating various aspects of Cloud services from a holistic view. However, there is still a gap between using benchmark suites and achieving holistic impression of the evaluated Cloud services. Most Cloud service evaluation work intended to report individual benchmarking results without delivering summary measures. As a result, it could be still hard for customers...
In this paper we propose an unsupervised method for Arabic word sense disambiguation. Using the corpus and the glosses of the ambiguous word, we define a method to generate automatically the context of use for each sense. Since that, we define a similarity measure based on collocation measures to find the most nearest context of use to the sentence containing the ambiguous word. The similarity measure...
An estimation method of the three-port S-parameters for reciprocal circuits is presented. In this method, several known loads are connected to two of the ports and reflection characteristic of the remaining port is measured. Therefore, there is no need to connect network analyzer to the ports which are connected to the known loads. S-parameters are obtained by solving a linear system equations and...
Multiuser voice conferencing platforms are more and more popular. Internet bandwidth is becoming very accessible, what makes voice over IP used on an everyday basis. Being able to communicate with multiple people at the same time can be beneficial, but on the other hand increases the need of coordination mechanisms. Determining a moderation scheme which is fair and efficient is not a trivial problem...
The coarse-grained reconfigurable architecture (CGRA) is a promising platform that provides both high performance and high power-efficiency. The compute-intensive portions of an application (e.g. loops) are often mapped onto CGRA for acceleration. To optimize the mapping of loop nests to CGRA, this paper makes two contributions: i) Establishing a precise CGRA performance model and formulating the...
In order to optimally schedule energy, consumers need to understand their energy utility function. The traditional utility function must be modified when consumers acquire production capabilities and become prosumers. This paper presents a formal economic model for prosumers, appropriately integrating distributed generation, storage and demand response capabilities. We identify the limitations of...
Physical models capture environmental phenomena such as biochemical reactions, a beating heart, or neuron synapses, using mathematical equations. Previous work has shown that physical models can execute orders of magnitude faster on FPGAs (Field-Programmable Gate Arrays) compared to desktop PCs. Different models of the same physical phenomenon may vary, with “upgraded” models being more accurate but...
Providing optimal Quality of Service (QoS) for Cloud Services Delivery Networks (CSDN) is a challenging task due to the mutual-interference phenomenon among multiple applications. Existing approaches only provide best-effort services, which aim to maximize the number of served users and sacrifice service dependability. To enhance the service dependability, designs of allocating fixed bandwidth among...
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