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This paper presents a three-phase isolated soft-switching dc-dc converter suitable for high-power applications. Three-phase star-connected high-frequency transformers provide isolation between input and output. Primary-side of the converter consists of three-phase inverting bridge with reverse-blocking switches. Secondary-side consists of three-phase diode bridge followed by dc output capacitors,...
This paper presents an overview of three works about graphene-based resistive random access memory (RRAM). The fabrication, device performance and working mechanism of graphene-inserted electrode RRAM, RRAM based on laser-scribed reduced graphene and gate-controlled graphene-electrode RRAM are introduced. This work may inspire new design of high-performance RRAM based on two-dimensional material and...
Keyboard, mouse as fundamental input devices of computer systems, have changed traditional input behavior of human beings & writing experiences. However, handwriting, painting are still indispensable communication styles. In recent years, touch screen has become a prevailing human computer interface on many kinds of digital devices, which makes it possible for people using a pen to take notes...
Due to node mobility, the network topology of a mobile ad-hoc network (MANET) usually varies from full connection to intermittent connection, showing a connection diversity. There have been many well-known routing protocols for full connection and intermittent connection situations respectively. However, it is hard to find one-fit-to-all routing protocol suitable in all connection situations. In this...
Recent years have seen an explosion of data volumes from a myriad of distributed sources such as ubiquitous cameras and various sensors. The challenges of analyzing these geographically dispersed datasets are increasing due to the significant data movement overhead, time-consuming data aggregation, and escalating energy needs. Rather than constantly move a tremendous amount of raw data to remote warehouse-scale...
Software Defined Networking (SDN) provides efficient network and traffic management for data center network. As underlying devices in SDN, SDN switches must maintain a large number of hardware counters. Implementation of these counters faces serious challenges for SDN switches, i.e., High memory consumption and inflexibility. Thus, we previously proposed Software Defined Hardware Counters (SDHC),...
A new topology of current-fed zero current switching (ZCS) three-phase DC-DC converter is proposed in this paper. The converter architecture is composed of a current-fed three-phase three-leg IGBT bridge, three single-phase high frequency transformers with star-connected primary, and three single-phase rectifier bridges with paralleled outputs. Primary IGBTs of the proposed modular phase converter...
Eco-friendly energy sources (i.e. green power) attract great attention as lowering computer carbon footprint has become a necessity. Existing proposals on managing green energy powered systems show sub-optimal results since they either use rigid load power capping or heavily rely on backup power. We propose Chameleon, a novel adaptive green throughput server. Chameleon comprises of multiple flexible...
Soft robots possess several potential advantages over traditional articulated ones and have attracted significant interest in recent years. However, to control this new type of robots using conventional model-based robotic control approaches is generally ineffective. In this paper, we investigate the challenge to embed and switch among multiple behaviors for an octopus-inspired soft robotic arm. An...
Large-scale computing systems such as data centers are facing increasing pressure to cap their carbon footprint. Integrating emerging clean energy solutions into computer system design therefore gains great significance in the green computing era. While some pioneering work on tracking variable power budget show promising energy efficiency, they are not suitable for data centers due to lack of performance...
Soft robots have significant advantages over traditional robots made of rigid materials. However, controlling this type of robot by conventional approaches is difficult. Reservoir computing has been demonstrated to be an effective approach for achieving rapid learning in benchmark tasks and conventional robots. In this study, we investigated the feasibility and capacity of the reservoir computing...
An automatic speed detection device of coal gas parsing speed based on microcontroller is designed in this paper. The STC12C5A60S2 MCU is the core of the system and the multi-scale segmentation of gas detection gas sensors system is designed in this paper to achieve the purpose of the coal gas parsing speed automatic detection. While a kind of large-capacity SD card data storage unit is designed to...
In this paper the improvement plan has been proposed to deal with such shortcomings exists in ARM9 and μC/OS-II real-time multi-tasking data acquisition system, in which task competition exist, the slow implementation of peripherals, in time update cannot be made. Achieved sampling channel priority dynamic scheduling, real-time parameters acquisition have been set up here. Peripherals operation which...
This paper is concerned with the problem of H∞ filtering for a class of discrete-time linear parameter-varying (LPV) systems with Markovian switching under data missing and quantization. A stochastic variable is used to describe the model of the data missing phenomenon. Then a H∞ filter is designed to guarantee the filtering error dynamics is stochastically stable with H∞ performance. The existence...
The resistance switching characteristics of Cu doped HfO2 film are investigated for nonvolatile memory. Two stable states can be achieved under both pulse and DC electrical stress. Good performances including large storage window, fast operation speed, good endurance, and long time retention are shown in this device. The metallic filament is confirmed as the physical origin for resistance switching...
ZrO2-based resistive random access memory devices composed of a thin Cu doped ZrO2 film sandwiched between an oxidizable top electrode and an inert bottom electrode are fabricated by e-beam evaporation at room temperature. The devices show reproducible nonpolar resistive switching. The formation and annihilation of localized conductive filaments is suggested to be responsible for the resistive switching...
Memristor has been extensively investigated as the fourth fundamental circuit element. A common material in fabricating memristors is titanium oxide. The growth of titanium oxide has so far been focused on atomic layer deposition or sputtering, which is expensive. In this paper, a low-cost memristor device is demonstrated based on titanium oxide, grown by the thermal oxidation of deposited Ti film...
This paper presents the design and analysis of a reconfigurable dual-band down-conversion mixer for IMT-Advanced (3.4~3.6 GHz) and UWB (4.2~4.8 GHz) applications. The proposed mixer is based on folded double-balanced Gilbert cell which is well-known for its low voltage, simplicity and well-balanced performances. The mixer adopts capacitive cross-coupling technique for input matching and performance...
A reconfigurable dual-band low noise amplifier (LNA) for 3.4-3.6 GHz IMT-Advanced and 4.2-4.8 GHz UWB systems is presented in this paper. Two different input matching networks with source-inductive-degeneration cascode configuration are used to switch at two different frequency bands. The parallel capacitors between the input MOSFETs' gate and source are used to optimize noise factor of the LNA. The...
This paper presents a dual-band CMOS LC voltage controlled oscillator (VCO) with a switched current source for 3.4-3.6 GHz IMT-Advanced and 4.2-4.8 GHz UWB applications. To accomplish dual-band operation, reconfigurable LC tank is adopted, and a switched current source has been used to guarantee robust start-up condition. Bias filters are used in VCO to suppress reference current noise and dynamic...
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