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In this paper, we break down the large-scale project into small units so that we can extract the parameters that relates most to the total cost more easily. However, the amount of these parameters are huge, causing much trouble for RBF neural fitting, so we need to reduce the number of these parameters by using PCA. Then we put the newly generated parameters as the inputs of RBF neural networks. The...
Rotational Inertia is an integral part of any electric power system. Due to the increased use of power electronics—both to connect Renewable Energy Sources (RES) and as drives for electric motors—inertia levels are generally reduced and become time dependent. The same power electronic technologies can also be used to actively provide inertia to the power system, raising the question what effect changes...
Video object recognition is an importance topic in both defense and civilian applications. However, object recognition guarantee is not considered in current video coding standard H.264. For this issue, experiments based on H.264/AVC codec are designed to measure the affection of coding parameters on recognition performance. The quantitative functions of recognition performance with coding rate and...
This paper presents elaborate evaluation of 600V/650V enhancement mode gallium nitride (GaN) devices. The switching loss mechanism and the impact of package and driving circuit parameters are illustrated in detail. The hard-switching turn-on loss is dominant due to junction capacitor charge of the freewheeling switch. The turn-off loss is much smaller and it can be further improved by driving circuit...
A design of MIMO antennas using two monopole structures adding a neutral line connected to ground plane for achieving better isolation is proposed and examined. The antenna uses curved C-shaped arm to resonance the bands of IEEE802.11b/g/n; another arm extended on the feed achieves the bands of IEEE 802.11a application. The overall size of the design is 45×25×1.6mm3; the occupied area of the antenna...
Aluminum air fuel cell has several characters as a kind of new energy, such as large specific energy, rich fuel source, low environmental pollution and so on. The character of high specific energy could extend driving range of electric vehicle, but a low specific power with aluminum air fuel cell demands it should cooperate with lithium ion battery and super capacitor, which export higher power to...
The exploitation and utilization of solar energy has been paied more attention because of large reserves, economic, cleanliness and so on as a new kind of energy. Photovoltaic power system is a kind of new power generation system which makes use of the photovoltaic effect of the semiconductor materials of the solar cell and converts solar radiation into electricity. This design presents a photovoltaic...
At present, there is an urgent requirement for the reliability and the radiation resistivity in remote sensing camera. The existing memories are mainly conventional semiconductor devices, which are easily affected by radiation and destroyed by radiation in aerospace. In this paper, we recommend an application of MRAM (Magnetic Random Access Memory) in remote sensing camera. The design improves the...
IoT (Internet of things) is such a key trend that it is quickly becoming one of the most influential research. Remote control plug introduced in this article is a tiny IoT product which connect plug with mobile phone. With home appliances plugged in smart plug, people can control appliances anytime anywhere. This paper introduces a overall design of remote control plug, including power supply module,...
Partial discharge (PD) and water tree is the important reason to insulation deterioration of XLPE cable, So PD monitoring and locating is an important means of cable operation and maintenance. On the basis of the mechanism of cable's PD and the research of cable aging diagnosis, the Matlab Simulink simulation model of XLPE is built, and the variation law of the chaotic characteristic parameters of...
In this paper, we propose an optimal signal constellation design algorithm suitable for the coherent optical nonlinear chromatic dispersion channels. The algorithm is a extended version of previously proposed algorithm for self phase modulation channel. Simulation results show significant improvement of bit error rate performances compared to the standard quadrature amplitude modulation format.
Multidimensional signal constellation sets suitable for nonlinear phase noise dominated channel are proposed, where the cumulative log-likelihood-function is used as the optimization criterion. Also, we demonstrate that our proposed signal constellation sets significantly outperform polarization switched QPSK and sphere packing constellations in 8-ary case and 16-ary case.
This paper is concerned with small-disturbance angle stability of microgrids from a graph theory perspective. Firstly, we build up the structure preserving model for mi-crogrids, and introduce the concept of the active power flow graph, the Laplacian matrix and the critical lines. We show that small-disturbance stability is equivalent to the positive semi-definiteness of the Laplacian matrix, and...
With the development of spatial information application technology of the digital waterway, there is an explosion in the amount of digital waterway spatial information. The purpose of this study is to propose a solution for data organization and service publishing of the digital waterway spatial information. First, the concept of multi-dimensional digital waterway model is introduced. This model fuses...
Under the background of navel key points air-defense, it analyses the constraint space of target assignment under Dynamic Fire Alliance (DFA) and presents the definition of assignment zone as well as its deadline. The assignment problem is considered as optimal matching among launch node, guide node and target. The Anytime algorithm based on DPSO is designed for solving the assignment problem. A simulation...
Digital image processing is widely used in the crack detection and location. In order to guide staff maintenance equipment more effectively and timely, the image detection system based on crack which has been put forward. On the basis of LabVIEW platform, Crack image in this system is acquired that using two industrial cameras, and then used the SIFT feature matching, RANSAC and image fusion to stitch...
The vibration signal of fault gear is related to non-stationary property, and the gear fault diagnosis will be seriously interfered by bearing signal and other noise signal. EEMD can adaptive decomposition of the vibration signal into different frequency components, but the precise extraction of useful signal is still a question. In this paper, a double determination criterion is presented to the...
The quasi-sliding-mode control based on non-linear surface which has variable damping characteristic is proposed for discrete-time systems with uncertainty which is boundary or slow time-variant. The strategy could ensure reduce the region of quasi-sliding mode, improve dynamic quality. The control chattering and steady-states chattering are avoided. Dynamic performance and steady-state behavior get...
With the high volume, velocity and variety characteristics, remote sensing(RS) data has been regarded as a typical big data. Cloud computing is a powerful technology in big data era. The Huge computing power of cloud computing could be leveraged in RS image data processing. This paper proposed a preliminary private cloud for RS image processing. The two cornerstone components of the private cloud...
Optical output modulation of over 15 GHz frequency was achieved in a short-external-cavity VCSEL by using a semi-spherical mirror for the cavity. The modulation was caused by the beat note between two external cavity modes.
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