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In this paper, a hybrid control concept for highly dynamic DC-DC buck converter systems in current regulation mode is introduced and described in detail. The controller combines the time-optimal dynamic response and excellent large signal properties of an adaptive hysteretic current controller with the reference tracking and insensitivity to parameter uncertainties of an average current controller...
In this paper the supply sensitivity of low-power time-domain temperature sensors in RFID sensor tags is analyzed. A common topology of recent published temperature sensors is proposed. Three time-domain temperature sensor topologies (“Inverted based topology”, “SC delay cell with two bias sources” and “SC delay cell with common bias source”) are modeled in this proposed common structure via Verilog...
System-Level simulator is proposed to determine the ability of synchronous and asynchronous NoCs to alleviate the process variation effect. Throughput variation and different delay components variation are provided by the newly developed framework. System-Level simulation shows similarities with circuit-level simulation in terms of behavior and performance variation trend when moving from one technology...
Vehicular Ad hoc Network (VANET) consists of group of moving vehicles acting as nodes, establishing its own dynamic topology for packets exchange. The vehicles or the nodes are usually travelling at high speeds, resulting into a frequently varying topology. In this paper, we present performance analysis of latest IEEE standard 802.11ac in comparison with previous MAC protocols like 802.11p and 802...
This paper proposes a topology optimization method for dual-threshold (DT) independent-gate (IG) FinFET circuits. In the proposed method, a node extraction algorithm is developed to extract the characteristic nodes of a BDD expression, which are suitable to be realized with the compact logic gates based on the DT IG FinFET devices, and then the equivalent replacement program that these extracted characteristic...
Interfacing techniques for near-threshold computing are described in this paper. A bi-directional input/output circuit with integrated level shifters is proposed for multiple near-threshold power domains. The circuit provides conversion ranges of 0.38 V to 1.2 V and 0.45 V to 3.3 V depending on the targeted output voltage. Eight different configurations of I/O circuits are evaluated with level shifters...
In the paper, the dynamics of goods distribution systems managed according to the continuous-review base-stock inventory policy are investigated. As opposed to the previous studies, which limit the scope to the fundamental serial and treelike settings, a multi-echelon mesh topology of interconnected actors (suppliers, distribution center, retailers) is considered. The exogenous, uncertain demand may...
The ring networks guarantee a high availability level, while limiting cabling costs. However, their performance analysis is still a relevant concern due to cyclic dependencies. In this paper, we handle this challenging issue based on Network Calculus formalism. We propose a new approach, Pay Multiplexing Only at Convergence points (PMOC), to compute accurate delay bounds while integrating the impact...
This paper discusses the cluster synchronization problem of complex dynamical networks consisted of Lur'e systems. Since the special topology structure of the complex network and the existence of stochastic phenomena, a kind of randomly occurring pinning controller is designed which not only synchronizes all Lur'e systems in the same cluster but also decreases the influence among different clusters...
This paper investigates the leader-following consensus problem for general linear multi-agent systems with time-varying delay. An observer-based distributed triggering mechanism is proposed to solve this problem. For each agent, the update of the designed distributed event-triggered controller only requires the knowledge of its neighbors' states at its own event time instants. A sufficient condition...
Aiming at providing united control of multi-domain optical networks orchestration, we design the Federated Platform based on Open Network Operating System (ONOS). Our implementation includes adding and extending modules in ONOS to provide the global view of multi-domain networks and support cross-domain end-to-end services by communicating with the individual domain controllers through RESTCONF protocol...
This paper concerns quality of service in optical burst switching realized by dynamic wavelength grouping. It reports detailed simulations of this method in presence of combined edge-core nodes using special scheduling algorithm. Specifically, we are interested in optimal partitionings of wavelengths among traffic classes of high and low priority. We observe certain tradeoffs between minimizing the...
Information centric networking (ICN) is one of the emerging Internet paradigms proposed to overcome the shortcoming of the current host-centric Internet. With ubiquitous in-network caching, ICN can facilitate content delivery and reduce network delay. In this paper, we propose a novel collaborative caching scheme based on routers' position to cache popular videos on the edge routers which are closer...
This study addresses the problem of distributed consensus for discrete-time networked multi-agent systems (NMASs) with communication delays in the transmission network. Different from existing techniques, the networked predictive control scheme is introduced to compensate for communication delays actively and overcome the difficulties induced by the delays. A distributed consensus protocol based on...
In this paper, we present a generalized lag synchronization-based method to identify the exact topology of uncertain complex networks with time delay and noise perturbation. By designing new controllers and novel adaptive identification rules, the unknown topological structure of the network is successfully identified in the process of synchronization. Meanwhile, we discuss the effect of time delay...
Traditional tomography methods are based on a single statistical feature(such as delay difference, variance, etc.) of network as a measure of the shared path length, but the single statistics don't reflect the time-varying of network performance parameters. In this paper, the packet group detection model is used to obtain the end-to-end delay curve in the non-stationary network for the first time...
This paper mainly concentrates on the consensus problem of the single integrator multi-agent systems with unbounded time-varying transmission delays and fixed directed topology. We show that the consensus problem can be solved under the spanning tree assumption and the no-cycle assumption. We characterize the no-cycle assumption and prove the consensus of multi-agent systems with an induction procedure...
The synchronization of multi-weighted complex dynamical networks with fixed and switching topologies is respectively investigated in this paper. Firstly, by putting to use Lyapunov functional approach and some inequality techniques, we establish a synchronization criterion for the multi-weighted complex dynamical network with fixed topology. In addition, the similar methods can be applied to get some...
Aiming at satisfying in a cost-effective manner the forecast traffic growth that future mobile networks will need to support, traditional distributed Radio Access Networks (RANs) are evolving towards centralized architectures. Specifically, the Cloud-RAN (C-RAN) architecture has shown that can alleviate to some extent the ever increasing Total Cost of Ownership in mobile networks. The current trend...
The consensus problem of time-delayed multi-agent systems under switching topologies is investigated. Event-triggered consensus algorithms are proposed to reduce times of both network communication and control updates. Moreover, the judgements of events are based on periodic sampling data, which guarantees that the Zeno behavior which is often a challenge in event-triggered consensus investigation...
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