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Today's WiFi networks deliver a large fraction of traffic. However, the performance and quality of WiFi networks are still far from satisfactory. Among many popular quality metrics (throughput, latency), the probability of successfully connecting to WiFi APs and the time cost of the WiFi connection set-up process are the two of the most critical metrics that affect WiFi users' experience. To understand...
Dynamic adaptive streaming over HTTP (DASH) has seen a rapid increase in recent years. While opening a door for ensuring smooth video playback with bitrate adaptation, especially for unstable networks, DASH also requires a set of new streaming strategies (e.g., bitrate adaptation). A key of designing these strategies is to understand the viewing engagement patterns in DASH, which are the correlation...
Switched reluctance motor (SRM) is suitable for electro-mobile drive system for its simple structure and good reliability. And torque production is highly nonlinear function because of the doubly salient construction. To reduce the torque ripple, speed closed loop control are often used in SRM drive system. In this paper, a new kind of fuzzy self-regulating PID controller has developed to obtain better...
In this paper, a general control approach is presented to achieve power-factor correction (PFC) for three-phase boost rectifiers. By considering the three-phase four-wire topology, the three-phase diode rectifier can be decoupled as independent single phase circuits. Thus the design of the controller is simplified by using the single-phase One-Cycle Control (OCC) with the advantages, such as constant...
Facing more and more serious scarcity of radio resources in today's society, cognitive radio offers a great solution from the theoretical level. But in the process of converting theoretical research into practical application, cognitive radio still has lots of inevitable problems. In this paper, demonstration about problems the cognitive radio encounters in practical applications is made from three...
Cyber-Physical Networked Systems (CPNS) are systems that integrate a multitude of nodes that perform computations for the sake of interacting with, or controlling, a physical process. The network plays an important role in CPNS supporting the interactions among the distributed nodes that enable the collaborative work towards the application goals. Some systems, e.g., target tracking systems, require...
ZigBee/IEEE 802.15.4 beacon-enabled mode allows low duty-cycle operation with high energy saving in the wireless sensor network. However, low duty cycles introduce higher end-to-end delay in event propagation and generally lower reactivity of the network with respect to the actual sensing. In target tracking systems, both qualities should be satisfied, namely, low energy consumption while no target...
There are numerous methods for identifying network traffic in recent research. In our experiment, flow is collected by using parallel probe and network IP packets are captured based on WinPcap's packet collecting technology. According to the characteristics of application layer protocol, a scalable identification system is proposed and network traffic can be classified as different application classes...
Virtual machine (VM) introspection is a powerful technique for determining the specific aspects of guest VM execution from outside the VM. Unfortunately, existing introspection solutions share a common questionable assumption. This assumption is embodied in the expectation that original kernel data structures are respected by the untrusted guest and thus can be directly used to bridge the well-known...
Real-time Ethernet emerges as the primary supporting technology for the next generation of industrial communications. As real-time performance is critical in many industrial applications, how to evaluate it in industrial Ethernet becomes vitally important. In this paper a mathematical model using Network Calculus is presented to calculate the upper bound of end-to-end delay in hybrid networks.
The complicated nonlinear behaviors of a triacbased controllable rectifier are investigated in this paper. The triac is modeled as a nonlinear equivalent resistor. Considering the triggering and conducting conditions of the triac and the conducting condition of the rectifier, a piecewise state space model is set up. Based on that, a discrete iteration mapping model is further developed to analyze...
Because of the unbalanced construction, the conventional three-phase three-leg inverters produce huge amount of common-mode (CM) voltage. This paper proposes a novel sinusoidal pulse width modulation (SPWM) control strategy based on three-phase four-leg structure. This strategy is an improved method on the basis of the SPWM carrier phase-shifting control technology. In the new method, the state of...
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