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A surface plasmon resonance cavity on an optical fiber end-facet is designed and demonstrated for ultrasound detection. A noise equivalent pressure of 25 KPa over 20 MHz, almost omni-directional response and stable performance are reported.
This paper investigates the way of adding lumped masses on decaying time constant of the disk resonator gyroscope (DRG). Three typical ways of adding lumped masses are discussed and compared in detail. The longest decay time constant of 9.357 s is presented. In addition, this paper also demonstrates that adding lumped masses has the capability of reducing the bias and bias drift of the DRG. The figure...
The fault diagnosis of gear transmission system is a complex process because of it's various influencing factors and variable performance. Further more, the gear transmission system often runs under variable load dynamic transient conditions. In order to extract the fault features from the complex running state accurately and improve the reliability and effectiveness of fault diagnosis, a novel approach...
Condition monitoring of machinery has entered the big data era, while the existence of dirty data reduces the quality of the whole data. In order to recognize the dirty data included in machinery monitoring data, a new method is proposed in this paper. First, a feature named sampled power index (SPI) is designed to transform the dirty data recognition issue into the outlier recognition. Then the windowing...
In this paper, an adaptive integrated hybrid AC/DC microgrid module is proposed to accommodate a wide range of Distributed Renewable Energy Resources (DRERs), Distributed Energy Storage Devices (DESDs) and Distributed Demand Resources (DDRs) into the existing distribution systems. This microgrid module is designed to be portable, scalable, easy of deployment, and simple of operation. IEC 61850 is...
Monitoring and predicting the increasing or decreasing trend of bug number in a software is of great importance to both software developers and users. Accurate predicting of number of software bug will help developers make timely and correct decision. For software users, knowing the possible number of software bugs will enable them to take seasonable actions to cope with loss caused by possible software...
Uniformity of root-mean-square delay spread (RMS-DS) is important for the reliability of over-the-air test when reverberation chamber (RC) is used as a wireless channel simulator. Both the state of stirrers and location of devices under test could affect the uniformity of RMS-DS. In this study we measured the RMS-DS in RC when stirrers were in different state and receiving antenna was located at different...
Click-baits are headlines that exaggerate the facts or hide the partial facts to attract user clicks. Click-baits deter readers from effectively and efficiently obtaining information in the era of information explosion, and will obviously affect user experience in news aggregator sites like Google News and Yahoo News. Detecting and preventing click-baits become crucial. Previous work achieved remarkable...
With the development of wireless communication, the characteristics of radio propagation become more and more important. Channel measurement and computer simulation are widely used in radio propagation research. For convenience, simulation based on FEKO was presented in this paper. The effect of frequency, antenna location, antenna height and conductivity on propagation characteristics in corridor...
This paper reports the design, fabrication and fundamental parameters testing of a novel honeycomb-like disk resonator gyroscope (HDRG). It has the same topological structure with the natural honeycomb and is composed of many interleaved hexagon cells, giving it the advantages of high space utilization ratio and excellent mechanical characteristics. Testing results show that it has about 17140Hz resonant...
Unmanned aerial vehicle (UAV) swarm, a new form of system of system (SoS), is the focus of various countries at present. Mission planning, however, is the key to successfully accomplish mission of UAV swarms. Although the mission planning technology has achieved a lot of results, there are not many achievements in the field of UAV swarms. In this paper, the mission planning of the UAV swarm is described...
This paper proposes a novel hybrid modulation technique for 3-phase dual-stage bidirectional inverter to achieve electrolytic capacitor-less design for the fuel cell vehicles (FCVs) propelling system. The 3-phase bidirectional inverter consists of front-end naturally clamped current-fed dual-active-bridge dc/dc converter and back-end voltage-fed six switches 3-phase inverter. The front-end converter...
A latch-up immune robust SCR with an N+ top layer and an additional Nwell region (Nwell2) is proposed in this paper. The N+ top layer and Nwell2 divide the original SCR into three new SCRs with sharing emitter, which provide the deeper ESD current (Iesd) path to improve the holding voltage (Vh) and failure current (It2). The relation between Vh and base-concentration (Nb) for LVTSCR is given to provide...
A novel DTI double RESURF LDMOS with P-sink layer is presented and experimentally demonstrated in this paper. The novel structure features a P-sink layer around the bottom of deep trench, which is formed with the Deep N-type Well (DNW) after the process of high temperature driving in. The highly doped P-sink layer restrains the extension of depletion region along the horizontal direction, improving...
Organizations often share business data with third-parties to perform data analytics. However, the business data may contain a lot of customers' private information. One major concern of these organizations is thus to ensure such private information is properly used. In this paper, we present PSpec, a formal language for specifying data usage restrictions in distributed data analytics. Compared with...
Content-Centric network (CCN) provides substantial flexibility for users to obtain information. One of the most important commonalities of CCN designs is the universal caching. It is widely accepted that in-network caching would improve performance. In this paper we propose a cache scheme based on popularity and age aiming at reducing network delay and redundancy. Then we implements the CCN network...
In order to meet the needs of different drivers on the parking fees, the distance from parking lot to the destination, as well as the individual needs of evaluation of the parking lot, by the analysis of driver's personal preference and parking behavior, the evaluation of the choice of parking lot is provided in this paper. Finally, by the type-2 fuzzy comprehensive evaluation method, the satisfaction...
Snapshot Isolation (SI) is a widely adopted concurrency control mechanism in database systems, which utilizes timestamps to resolve conflicts between transactions. However, centralized allocation of timestamps is a potential bottleneck for parallel transaction management. This bottleneck is becoming increasingly visible with the rapidly growing degree of parallelism of today's computing platforms...
This paper proposes and demonstrates a novel method to greatly enhance the thermoelastic quality-factor (QTED) of disk resonator gyroscope (DRG) which is hanging lumped mass on the frame structure. This method could greatly reduce the resonant frequency f0 whereas rarely affect the relaxation rate fRelax. Simulations and experiments have been implemented to verify this technique. The fabricated enhanced...
This paper reports a novel honeycomb-like disk resonator for gyroscopic application. Compared with the state of the art nested-rings disk resonator, the honeycomb-like disk resonator can provide more than two-fold higher immunity to the fabrication error, which means that structure imperfection could cause less relative frequency error. The honeycomb-like disk resonator also shows much higher resonant...
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