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Use of open channel communication in automatic generation control (AGC) of interconnected power systems leads to time delay in the secondary frequency control loop. Such time delayed AGC of a power system can lead to unstable operation. This paper presents an insight on how gain tuning approaches need to be changed from single objective to multi objective in order to achieve stable operation as well...
This paper proposes a distributed controller placement problem that finds out the pareto optimal solutions minimizing the switch-to-controller delay, controller-to-controller delay, and controller load imbalance for wide area software defined networks. We introduce a general model that not only considers the controller placements but also the switch assignments, so that this model can further be used...
Power consumption is one of the key optimization objectives for modern integrated circuit designs. More than 40% of the total power consumption is contributed by clock trees due to their high frequency of switching and high capacitance. In the traditional physical design flow, placement is done before clock tree synthesis (CTS). CTS constructs a tree to connect the clock source with all the registers...
The short reference differential chaos shift keying (SR-DCSK) is a variant of DCSK which increases data rata and enhances energy efficiency without extra complexity. However, the advantages of bit error ratio (BER) performance of the SR-DCSK over the conventional DCSK is not notable even if the optimal length of reference signal is applied. In this paper, we propose an improved SR-DCSK scheme where...
This paper examines the tracking property of nonlinear delayed multi-agent systems with impulsive effects. The strengths and locations of the stabilizing impulses, as well as the number of the controlled nodes are all assumed to be time-varying. Some sufficient criteria are established such that the considered system can exponentially track the dynamical reference state based on the given impulsive...
We consider a mobile-CDN system where base stations (BSs) are equipped with storage for replicating and distributing content. In such a system, BSs cooperation in replying user requests is a widely adopted mechanism. For such cooperative caching, a key issue is the joint optimization of content placement and request redirection, which has been intensively investigated in the literature. However, optimizing...
Mobile edge computing (MEC) has recently emerged as an important paradigm to bring computation and cache resources to the edge of core networks. However, the resources of edge network are relatively limited, so it is necessary to cooperate with data center (DC) which has sufficient computational resources. In this paper, we aim at designing a computation offloading and data caching model under the...
In this paper, we investigate the quality of information (QoI) maximization problem by jointly optimizing the sampling rate, packet-dropped rate, and transmit power in wireless sensor networks (WSNs). We consider a complicated but practical scenario, where various tasks with heterogeneous traffic are supported by one WSN simultaneously. Accordingly, the QoI maximization problem is formulated as a...
There are two broad safety related message categories in vehicular networks: emergency and periodic messages that should share the scarce wireless resource simultaneously. Emergency messages deliver time-critical information with guaranteed reliability, e.g., road-safety information, whereas periodic ones convey normal status update information, e.g., vehicular positions, that is less time- and loss-critical...
This paper presents a particle swarm optimization (PSO) timing scheme for a single intersection and a bidirectional green wave coordination control scheme for an artery. The timing strategy is proposed to reduce vehicle delays based on Akcelik delay model at the intersection via adaptive particle swarm optimization (APSO) algorithm. The coordination control scheme is designed to make as many vehicles...
The network infrastructures have been rapidly upgraded in many high-performance networks (HPNs). However, such infrastructure investment has not led to corresponding performance improvement in big data transfer, especially at the application layer, largely due to the complexity of optimizing transport control on end hosts. We design and implement ProbData, a PRofiling Optimization Based DAta Transfer...
Software defined networking (SDN) has been proposed as a novel centralized architecture which is capable of offering flexible network management and user quality-of-service (QoS) guaranteed applications. The problem of controller placement in SDN, i.e., determining the locations of the controllers has received considerable attention in recent years. In this paper, we jointly consider the control plane...
As an emerging technology, software defined networking (SDN) allows flexible control of network devices and supports user applications with guaranteed quality of service (QoS). To achieve flow transmission between two non-adjacent switches in SDN, efficient routing algorithm should be designed. In this paper, we jointly consider route selection and flow allocation problem. To stress the service sensitivity...
Using Commercial off-the-shelf (COTS) software over networks that are Disconnected, Intermittent and Limited (DIL) may not offer acceptable performance. Frequent network interruptions for both shorter and longer periods, as well as long delays, low data and high packet error rates characterize DIL networks. In this paper, we designed and implemented a prototype proxy to improve the performance of...
Emergency situations require accurate and timely decisions in order to reduce delay and the additional impact of incidents on human lives and civil properties. However, decision-making in urban emergency situations is a challenging task due to the number of variables influencing the process and the unpredictable change of some of them. This process characteristic requires that decision-makers monitor...
Among the schemes proposed for failure recovery in software-defined networks, installing backup paths in advance is considered to be an effective approach to reduce the recovery latency. However, the pre-installation poses undue storage overheads on flow tables. In this paper, we propose a customized and cost-efficient backup scheme, which achieves fast recovery from any single-link failure. We introduce...
The rapid growth of traffic demands has posed challenges and difficulties on both the radio access networks (RANs) and the backhaul links. To stress these problems, caching technology, more specifically, caching user contents at the infrastructures of different RANs is proposed as an effective approach. In this paper, we consider the joint user association and cache content placement problem in cache-enabled...
This paper mainly presents a design of optimized (15, 4) parallel counter. When testing the design with 15 rows of inputs, synthesis report of our design performs better in respect of delay, area and power consumption than other two existing design. This result shows that processes such as partial product reduction in a multiplier or column-addition in a matrix could be more efficient, especially...
Vehicular Ad Hoc Networks (VANET) have become one of the most important research areas for the successful and deployment of intelligent transportation system and the unmanned vehicle technologies. In VANET, Travel Prediction-based Data Forwarding (TPD) was proposed as one of novel data forwarding schemes based on road traffic statistics. However, the TPD could not guarantee good performance in the...
The future 5G networks need to support different kinds of business and applications, so the cloud radio access networks (C-RAN) which can provide a centralized collaborative resource management gain through small base stations, and seamless handoff also can be achieved through the overlapping deployment of macro base stations and micro base stations has become one of the important directions in 5G...
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