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Modular multiplication, addition, and subtraction being the core operation of Elliptic curve public(ECC) system, the decrease of area and the merging of structure have been a hot topic in recent years. This paper first analyzes the difference between multiplication type and addition type of modular multiplier. Then, Combined with the structural characteristics of the modular adder, and mixing modular...
Accurate and fast detection of harmonics is the basis for active filters to work regularly. Propose an improved generalized IP-IQ harmonic detection algorithm. Analyzed generalized IP-IQ harmonic detection algorithm, pointed out two advantages of this algorithm: It can separate any order of harmonic and detect harmonic correctly even if the voltage of grid is distorted. But the generalized IP-IQ algorithm...
With compact folded method, a kind of folded crossed dipole ultra wideband antenna is proposed with omnidirectional radiation characteristics on the horizontal direction in this paper. The antenna is comprised of orthogonal crossed semicircular metal discs with twice 90° folded on both ends. Horizontal size is reduced obviously compared with original crossed semicircular disc antenna. This antenna...
Multi-rate (MR) simulation is necessary for a system which contains both large and small time constraints. In the traditional MR real-time simulation of MMC, only the MMC valves are implemented on FPGA with a small time-step, while the rest parts are implemented on central processing units (CPU) with a large time-step. This paper presents a fully FPGA based MR real-time simulation of two MMC terminals...
When configuring a delay tolerant network (DTN), there are many aspects that need to be taken into consideration for an effective and efficient network. One aspect is a buffer management strategy. Buffer strategies are used to determine which packets need to be forwarded or dropped. This paper will focus on the variety of buffer management strategies available, providing a comprehensive survey and...
Real-time simulation is an important tool of validating the performance of the modular multilevel converter (MMC). By using the field programmable gates array (FPGA), MMC valves with hundreds of sub-modules and the large number of inputs and outputs can be simulated in real-time. In the traditional FPGA based real-time simulation, only the MMC valves are implemented on FPGA, while the rest parts including...
Current source converter (CSC) is mainly applied in high medium voltage drives. To increase the system power region and reduce the output harmonics, parallel connection is an easy-implement and practical method. There are mainly two types of parallel based topologies. The direct parallel connect of two back-to-back CSCs is the first type, the two DC links can be controlled from the rectifier side...
Medium/High power converters usually employ low switching frequency to reduce power loss, resulting in large system delay in their control system. The multi-sampling technique is an effective method to reduce the system delay while this will make the system a Linear Periodic Time Varying (LPTV) system. Modeling this kind of system by using LTI modeling method, such as Laplace transform, Z-transform,...
Isolated AC/DC matrix converter can realize AC-DC conversion with high frequency transformer to isolate the AC and DC side. Thanks to its high-power density and high efficiency, it is an attractive alternative to the conventional voltage source converter in hybrid microgird as interlinking converter, which adopts power frequency transformers when isolation is required. To realize this, bi-directional...
Long transactions, high concurrency, and frequent activity situations occur in many areas. The intermediate process of long transactions in the process of execution is more, in the process, therefore, can not avoid frequent access to the data, the system overhead of the data access process is relatively large, which reduces the efficiency of the system and increase the pressure of the server. The...
The methods of establishing the cell and animal calcification model were discussed. In vitro, the rat vascular smooth muscle cell strain A10 was cultured, the control group and the high phosphorus group were cultured for 12 days to stain, and the relationship between high phosphorus and vascular smooth muscle cell calcification was studied by reverse transcription PCR analysis. In vivo, the mice have...
The ideal Gaussian pulse can be more convenient to simulate the excitation of electromagnetic waves and its propagation characteristics, but the pulse and the actual local discharge current waveform is not exactly the same. At the same time, most of the previous research contents have adopted the simplified GIS simulation model, which does not take into account the influence of the arc of the basin...
Recognising semantic pedestrian attributes in surveillance images is a challenging task for computer vision, particularly when the imaging quality is poor with complex background clutter and uncontrolled viewing conditions, and the number of labelled training data is small. In this work, we formulate a Joint Recurrent Learning (JRL) model for exploring attribute context and correlation in order to...
A broadband silicon PSR is presented with an insertion loss lower than ∼0.7dB/0.3dB and crosstalk lower than 12.1dB/14.7dB for TE and TM mode respectively. By combining the PSR with AWG and Germanium PDs, an integrated polarization insensitive DWDM receiver is further demonstrated.
High voltage SF6 circuit breaker must meet the breaking requirement for large short-circuit current, and ensure absence of breakdown after breaking small current. A 126kV high voltage SF6 circuit breaker was used as the research object in this paper. Based on the calculation results of non-equilibrium arc plasma material parameters, the distribution of pressure, temperature and density were calculated...
Predicting zeroes precisely and rapidly after a fault initiation is the basis of controlled fault interruption. However, none available algorithms could predict current zeroes within several milliseconds. The objective of this paper is to propose a fast estimation algorithm that can predict current zeros within 3ms after fault initiation. An algorithm is proposed based on an improved BP network. In...
A new germanium-on-silicon nitride platform is fabricated and tested for mld-lR sensing applications. Waveguides with low bending loss are demonstrated allowing one to design compact on-chip sensors. Spiral waveguide sensors have been studied for potential drug detection and food processing applications.
An integrated optoelectronic Oscillator (IOEO) which combines the integrated technologies of photonics and electronics has been developed. All of the necessary elements (for example, laser, photo-detector, electrical amplifier, electrical filter, etc.) have been assembled on a print circuit board (PCB) within size of 5∗6 cm. To the best of our knowledge, it is the first time to integrate both the...
We presented a novel technique of generating arbitrary waveforms based on wavelength-to-time mapping (WTTM) without any dispersion. A variety of waveforms has been generated, including Gaussian, square, and other specific waveforms, is demonstrated experimentally. The arbitrary waveform generator feathers superior advantages such as low power loss, simple structure, and high reconfiguration.
In order to improve the corrosion maintenance efficiency of grounding grid metal, the corrosion state of underground grounding grid in an 110kV substation was tested and evaluated by the electrical impedance tomography (EIT) technology. Results indicated that the impedance increase ratio of grounding grid branch was in a reasonable range below the warning value, proving the whole ground grid metal...
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