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We demonstrate a new fiber-optic current sensor based on graphene nanoelectromechanical systems (NEMS) with a graphene membrane covering the hole on a fiber tip and two gold electrodes on opposite sides of the tip. The suspended graphene membrane will deform due to thermal effect when electrical current flows through it. Then the strain in the graphene nanomechanical resonator will change and it leads...
A novel high-resolution inverse synthetic aperture radar (ISAR) imaging method using homotopic non-convex regularization technique is proposed in this paper. Compared with exsiting compressive sensing (CS) based imaging methods, the proposed method can deal well with off-grid scatterers in the imaging scene, besides it has low computational complexity, therefore has potential to be applied in practice...
In this paper, a dual-band horn antenna operating at 94 GHz and 340 GHz is presented. The low band is determined by a two-mode conical horn, and the high band is provided by a tapered dielectric strip, which is inserted in the horn. The two radiators are orthogonally excited by a two-port waveguide. Both of the two bands have equal beam-width in E and H planes. The simulated results show that the...
With the development of micro-electromechanical systems, the micro-holes structure of non-conductive hard and brittle materials has been widely used in aerospace, automotive electronics, biomedicine, national defense science and technology and other fields. However, due to the properties of the non-conductive hard and brittle material itself, it is very difficult to fabricate the micro-holes structure...
In order to machine multiple micro-channels with top quality, high efficiency and low cost, the electrochemical machining by using movable mask which include auxiliary anode layer was put forward to machine multiple micro-channels. A mathematical model of the electrochemical machining with movable mask by auxiliary anode has been established. And the electric filed distribution in the interelectrode...
The commonly-used software fault localization approaches mainly utilize test coverage information and test cases execution results to calculate the suspiciousness of each program entity to identify the location of faults, namely spectrum based software fault localization (SBFL). It had been argued that such techniques are not helpful in real debugging process, since the low accuracy of localization...
This paper introduces a kind of temperature controller with ARM microcontroller based on the characteristic model method. Firstly, the hardware structure and software design of the thermostat system are introduced. Secondly, the all-coefficient adaptive control algorithm of the feature model is summarized. Then, the realization and comparison of the new temperature controller are carried out. Finally,...
The mobile C-arm can be used for 2D and 3D X-ray imaging. The motion of 3D X-ray scanning may result in vibration of the C-arm, which will probably affect the image quality. It is very necessary to study the relationship between the vibration characteristics of the C-arm and scanning motion. In the paper, we made modal analysis of the mobile C-arm based on Solidworks, and obtain the initial 6 order...
Reliability of Superjunction (SJ) MOSFET is closely related to its manufacturing process. Experiments are carried out to investigate the electrical characteristics in high temperature of SJ MOSFET produced by deep trench filling technology. Filling holes are confirmed to be responsible for the performance deterioration in high temperature and the mechanism has been analyzed thoroughly.
Structured output support vector machine (SVM) based tracking algorithms have shown favorable performance recently. Nonetheless, the time-consuming candidate sampling and complex optimization limit their real-time applications. In this paper, we propose a novel large margin object tracking method which absorbs the strong discriminative ability from structured output SVM and speeds up by the correlation...
This paper proposes a hybrid negative correlation learning in which each individual neural network in an neural network ensemble would either learn a data point by negative correlation learning or learn to be different to the neural network ensemble. The implementation is through randomly splitting the training set into two subsets for each individual neural network in learning. On one subset of the...
A microfluidic flowmeter is proposed based on graphene integrated “hot-wire” structure. A long-period fiber grating (LPFG) is written in a single mode fiber by CO2 laser to excite the higher-order mode. Graphene is coated around the grating to absorb the higher-order mode and generate the heat. The fiber is sealed into a home-made tube. When the microfluid flows through the graphene, the heat is taken...
Data mining can find some interest information from large amounts of data. Data association (association rules) can find associations among data items. Data classification distinguishes every data from a data set or group, and it also can combine data association. Formal concept analysis is a data analyzing theory which discovers concept structure in data sets. It can transform formal context into...
Mutation Based Fault Localization(MBFL) is a fault localization technique based on mutation analysis, which precisely identifies the location of fault but incurs a high execution cost, since it needs to execute the test suite on a large amount of mutants. Reduction strategies proposed are usually regarding selecting mutation operators or sampling mutants directly, meanwhile at the cost of losing precision...
In order to filter tracks of ship targets for space-based maritime surveillance using electronic reconnaissance satellites, an extended Kalman filter (EKF) algorithm in geographic coordinates is proposed in this paper. Firstly, different methods of Dead reckoning (DR) are analysed in different coordinate systems. Then, the formula of EKF based on middle latitude sailing is derived. Finally, satellite-based...
A low phase noise oscillator based on substrate integrated waveguide (SIW) combline resonator is presented. By taking high-Q advantage of the resonator's superior characteristics, the proposed oscillator possesses low phase noise performance with a compact size. For validating the idea, an oscillator operating at X-band is designed and fabricated. The measured results show that at the oscillation...
The high power density converter (HPDC) in more electric aircraft gains more and more attention. However, HPDC is one of the main harmonics and electromagnetic influence (EMI) sources in aircraft network. To improve power density of HPDC, different levels with power converter includes 2-level, 3-level, and 5-level configurations will be investigated. Besides, two 3-phase power grids such as 3-phase...
High power density converter (HPDC) is important for more electric aircraft (MEA) applications, and high power density EMI filter is essential in HPDC systems, which suppresses EMI to meet the electromagnetic compatibility (EMC) requirement. Common mode choke (CMC) is a critical component of the EMI filter. Due to higher core loss and harsh operating temperature environment, thermal analysis of CMC...
It is of great significance for achieving constant speed downhill control to improve efficiency and safety of vehicle transport. The vehicle hydraulic retarder is an auxiliary braking device that brakes the vehicle and keeps the vehicle speed stable without using main brake or using fewer main brake. This study aims at constant speed downhill control for heavy truck, the process of vehicle downhill...
360 degree video compression and delivery is one of the key components of virtual reality (VR) applications. In such applications, the users may freely control and navigate the captured 3D environment from any viewing direction. Given that only a small portion of the entire video is watched at any time, fetching the entire 360 degree raw video is therefore unnecessary and bandwidth-consuming. In this...
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