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In the mobile communications market, the homogeneity phenomenon of product's service appears. The paper combines the Technology Acceptance Model (TAM) and Switching Cost Theory to construct the Convert Selection Model about the mobile communication services for users, which mainly analyzed from five dimensions: perceived switching costs, differences in perceived usefulness, differences in perceived...
Limited preemption scheduling has been introduced as a viable alternative to non-preemptive and fully preemptive scheduling when reduced blocking times need to coexist with an acceptable context switch overhead. To achieve this goal, preemptions are allowed only at selected points of the code of each task, decreasing the preemption overhead and simplifying the estimation of worst-case execution parameters...
This paper designs switching rules for asymptotic stability of switched Hamiltonian systems with multiple equilibrium points. For the case that each subsystem has a unique equilibrium point and all equilibrium points are different from each other, we design a kind of switching rules under which the system is asymptotically stable with respect to a desirable equilibrium point. Study of an example and...
Switched reluctance motor drive system becomes an attractive alternative in adjustable speed drive due to its simplicity in both motor construction and power converter, and vibration that resulting acoustic noise in switched reluctance motor have generated intense interest from the time it became commercially competitive with dc and ac drives. Focus on the magnetic noise vibration, dig the relationship...
This article discussed about modeling of uCOS real time operation system kernel which is widely used in embedded system field based on CSP, describing the behavior of uCOS from the higher abstract layer, to help us understand how uCOS working better, also provide foundation of further working on uCOS includes model checking and soundness verification on uCOS. This article focused on the task scheduling...
Modeling the effect of coupling-noise on circuit delay is a key issue in static timing analysis and involves the victim-aggressor alignment problem. As delay-noise strongly depends on the skew between the victim-aggressor driver input transitions, it is not possible a priori identify the victim-driver input transition that results in the worst-case delay-noise. Several approaches have been proposed...
In this paper, we present a Maude-based tool for embedded systems specification, performance estimation and formal verification of some properties. In our case, the application is modeled as a network of concurrent tasks with coarse grained actions (CGAs) that communicate with each other via abstract channels following Kahn process networks (KPNs) model of computation semantics. In order to achieve...
It has been reported that Internet Protocol (IP) packet traffic exhibits self-similarity or long range dependence (LRD) and causes the degradation of switch performance. Therefore, it is crucial for an appropriate buffer design of switch. In this paper, we investigate the packet loss behavior of the switch under self-similar variable packet length traffic by modeling it MMPP/M/1/K as queueing system...
In this paper a global co-simulation methodology for concurrent/simultaneous analysis of passive and active analog/digital parts is proposed. An original power-signature concept is introduced to model high-speed digital modules temporal and spatial distribution of their power switching activity through specified chip partitions. Dedicated real-world NXP-Philips-Semiconductors active modules mounted...
In this paper, an analysis is given to the topology of cascaded seven-level inverter. Then its simulation model is set up. On the other hand, several carrier control strategies are discussed, modeled and applied for the control of this multilevel inverter respectively, including phase disposition, phase opposition disposition and alternative phase opposition disposition. Then the switching control...
This paper analyzes the maximal power loss in the output diode of flyback switching converter operating in both continuous conducting mode (CCM) and discontinuous conducting mode (DCM). Comparing with the previous work, this paper extends the condition, under which the maximal power loss of the output diode occurs, from the CCM to the DCM. Three correlative tasks are included. Firstly, through an...
This paper presents a MATLAB/Simulink simulation model for a space vector modulated matrix converter. Indirect and direct space vector modulation methods are implemented using an almost common structure, following a shared approach. Different switching strategies are simulated and analyzed for both methods. In addition, a set of rules are proposed for direct space vector modulation switching strategies...
Aiming at strong nonlinearity and complexity of higher order switching converters, an integrative modeling method was proposed by integrating the state-space average modeling approach with the discrete-time modeling approach, based on which, stability analysis of current-mode controlled higher order switching converters was carried out, and the relation between the stability and the circuit parameters...
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