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The purpose of this paper is to present a digitally controlled dc-dc converter with a novel peak current injected technique. In the proposed method, the peak current is able to be detected by using a voltage controlled oscillator (VCO) which is very low cost and the simple delay circuit implemented by the a field programmable gate array (FPGA). As a result, it is confirmed the main switch is turned...
This paper studies the capacity performance of coordinated multi-point (CoMP) downlink transmissions based on limited feedback. We consider both path loss effects and channel imperfections including feedback delay and quantization error. Closed-form expressions are derived to characterize ergodic achievable rates for joint processing (JP) and coordinated beamforming (CBF) techniques, respectively...
This paper introduces Adaptive Backpressure, a novel scheme that improves the utilization of dynamically managed router input buffers by continuously adjusting the stiffness of the flow control feedback loop in response to observed traffic conditions. Through a simple extension to the router's flow control mechanism, the proposed scheme heuristically limits the number of credits available to individual...
Improving link utilization is a key aspect in interconnection network design. Reconfigurable-direction interrouter links optimize network resource utilization, which substantially increases the maximum achievable throughput. In the case of On-chip Networks, the short distance between adjacent routers makes feasible fast link arbitration, which makes dynamic link reconfiguration an attractive solution...
A new Physically Unclonable Function (PUF) variant was developed on an FPGA, and its quality evaluated. It is conceptually similar to PUFs developed using standard SRAM cells, except it utilizes general FPGA reconfigurable fabric, which offers several advantages. Comparison between our approach and other PUF designs indicates that our design is competitive in terms of repeatability within a given...
Among the various multi-level topologies, flying capacitor converters are promising from the view point of the high power density because the size of the capacitors, which is a major concern, is expected to be reduced. Although the voltages of the capacitors theoretically can stay in the balanced condition, they tend to be unbalanced under some practical conditions. So far, it has been clarified quantitatively...
This paper proposes a primary side control scheme for triac dimmer compatible LED driver based on Flyback topology. By sensing the average primary side switch current and transformer auxiliary winding voltage signal, the output current can be derived using the proposed calculation method, which can be adopted in any operation mode with variable frequency and constant frequency control. Based on this...
This paper introduces the design process of GARI, a novel routing protocol that incorporates cognitive networking concepts. This approach involves the monitoring of dynamic network conditions locally to adapt the routing strategy for a better performance of the global system. The result is a self-organizing network that meets the service requirements for the emerging applications of ad hoc networks.
A seamless transition method has been presented for a droop-controlled inverter to transfer between islanded and grid-connected operations. A so-called virtual inductance and local phase-locked-loop (PLL) were proposed to realize this transition with no grid synchronization. This paper presents designing of variable virtual inductance to suppress inrush current, including exponentially-decaying, ramp-decaying,...
In this paper, some ideas of switched systems with distributed time-varying delays are investigated. Based on the Lyapunov-Krasovskii functional and free-weighting matrices technique, the average dwell time method is applied to ensure the exponential stability of the systems. And a new stability criterion is obtained by the means of linear matrix inequities (LMI). Finally, a numerical example is presented...
Multi-core virtualization platform is an essential basement of modern computing environment including server consolidation and cloud computing. However hidden contention for physical resources between different workloads always causes serious performance interference and thus reduces system performance and efficiency. In order to address this issue, we exploit the possibility of scheduling virtual...
In this paper, some delay-dependent LMI stabilization criteria are proposed to design H∞ switching control and switching signal for discrete switched system with interval time-varying delay. Some nonnegative inequalities are used to improve the conservativeness of the proposed results. Finally, a numerical example is illustrated to show the main proposed result.
Mutation testing is a fault-based technique widely used for testing software. Particularly, it allows the effectiveness of a set of test data to be evaluated in terms of the ability to reveal faults. Nowadays, many industrial complex systems are more and more developed. Such systems require more testing activities to ensure a good quality. Simulink is one of the most popular tools to develop this...
STP Spanning Tree Protocol as an important method to prevent broadcast storms since the 1985 proposed by Radia Perlem, has been widely used. This paper presents anew technology named DVSP-open flow. Compare STP and the STP improved version, this technology can be can be forward data packets dynamic by using Open Flow support switches. This method separates the forward rules and control rules and the...
In the previous papers, we presented a new mesh of trees based switch architecture, denoted as MOTS (N) switch, along with its variations IMOTS (N) and IMOTS-CT (N) switches. The analysis and simulation results were presented that all of them achieve 100% throughput and the mean cell delay of IMOTS-CT (N) is comparable to that of OQ switch with FIFO queues (FIFO-OQ). Especially, IMOTS-CT (N) was proposed...
Data center networks are characterized by high link speeds, low propagation delays, small switch buffers, and temporally clustered arrivals of many concurrent TCP flows fulfilling data transfer requests. However, the combination of these features can lead to transient buffer overflow and bursty packet losses, which in turn lead to TCP retransmission timeouts that degrade the performance of short-lived...
A 9-bit 100 MS/s flash-successive approximation register (SAR) analog-to-digital converter (ADC), which is suitable for wireless communication systems, is presented. To reduce the active area and power consumption, front-end track-and-hold circuits in the flash ADCs are substituted by dynamic ones. A variable delay loop for enhancing dynamic performances is also included in the ADC. The prototype...
Chip-multiprocessors need low cost and high performance communication structure. Network-on-Chip (NOC) is a promising candidate because of its high scalability. In this paper, a hybrid circuit-switched (HCS) NOC is proposed. The HCS NOC uses bufferless switch and pipeline channel to construct the on-chip network. A network interface is also designed to make the HCS NOC AMBA-compatible. Packet setup...
Wormhole switching technology is widely used in High Performance Computer (HPC) systems. The delay estimation of wormhole switching is mainly focused on average packet delay. But in order to provide Quality of Service (QoS) guarantees, we should analyze the end-to-end delay bound of wormhole switching. Based on models of Credit Stall and Switch Allocation Stall, we use arrival curve to constrain the...
The internet IP multicast technology has been extended to the field of wireless mobile. High performance routing algorithm is important for multimedia multicast in mobile wireless internet environment. This paper proposes a high performance multicast routing algorithm in mobile IP environment based on the super node set, which can reduce the cost of multicast generation tree, and greatly reduce the...
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