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In order to solve a series of problems caused by photovoltaic (PV) off-grid, PV must have the low voltage ride through (LVRT) capability ensuring grid-connected operation and outputting reactive power to power grid within a certain time range. At present, the control strategies of PV grid-connected inverter under balance fault have been used effectively. However, the strategy of keeping the inverter...
In this paper, we first provide a new perspective to divide existing high performance object detection methods into direct and indirect regressions. Direct regression performs boundary regression by predicting the offsets from a given point, while indirect regression predicts the offsets from some bounding box proposals. In the context of multioriented scene text detection, we analyze the drawbacks...
Recent research on eco-driving has paid more attention on human driving behavior and vehicle performance, but neglects the impacts imposed by dynamic, discrete and distributive traffic, which may result in partial and limited eco-driving suggestions. This paper presents a multi-factor integration based eco-driving optimization method for vehicles with same driving characteristics. It constructs driving...
Average-consensus filter problem is investigated for a mixed-order multi-agent system, which consists of first-order and second-order agents, and the proportional-integral consensus filter algorithms are proposed for the agents with different constant inputs. Based on generalized Nyquist stability criterion, sufficient convergence conditions are obtained for the multiagent system under a fixed, symmetric...
This paper proposes a new synthesizable oscillator-based temperature sensor with minimal footprint for use in contemporary Xilinx FPGA devices. In contrast to previously published ring-oscillator architectures, based on inverters mapped onto single LUTs, the proposed oscillator uses an asynchronous Gray-coded 4-bit counter requiring only two 6-input LUTs. Due to its reduced hardware requirements,...
For revealing the influences of thermomigration effect (TM) on the creep properties of interconnecting solder joints in electronic packaging industry, the creep behavior of Cu/Sn0.7Cu/Cu solder joints were researched under temperature gradient of 1043°C/cm and isothermal temperature of 100°C(median temperature) with different shear stress, respectively. It is approved that the creep lifetime of the...
The study aims to research the effecting factors of the level of independent innovation ability in China, constructing innovation environment by the grey clustering model and build the national innovation capability evaluation index system, including the innovation input, innovation output and innovation potential of 4 indexes and 17 level two indexes. The related data of 26 countries was collected...
In field of multi-modal data modeling, semantic analysis method has been widely applied for solving the problem of semantic gap, and one of the leading approaches is based on topic modelling. From a computational method perspective, the national culture data is a typical example of multi-modal data, which combines information from different sources. This paper reviews the development of multi-modal...
Transactional data such as shopping logs, web search queries and medical notes present enormous opportunities for knowledge discovery through data mining. When such data is published for knowledge discovery, privacy disclosure risks arise, making privacy preserving publication a fundamental requirement. However, existing publication mechanisms do not fully prevent an adversary from making an inference...
This paper proposes a new maintenance modeling for evaluating Mean Time To Repair (MTTR) of complex systems based on Goal Orient (GO) method. First, the GO operation formulas of MTTR for the frequently-used GO operators are proposed. Then, the system MTTR evaluation process of this paper' method is formulated. Finally, this paper's method is used to evaluate the MTTR of a hydraulic oil supply system...
Metasurfaces are well known as a single-layer subwavelength structure with superior capability in wavefront shaping, and cascaded metasurfaces with multi-layer structures resulting in compact optical devices will further improve the performance and also bring in new functionalities, such as image correction, optical transformation and processing. However, in order to realize such cascaded metasurfaces,...
In this paper, we propose a kernel low-rank multitask learning (KL-MTL) method to handle multiple features from the variational mode decomposition (VMD) domain for hyperspectral (HSI) classification. Core ideas of the proposed method are twofold: 1) a non-recursive VMD method is applied to extract various features (i.e. intrinsic mode functions (IMFs)) of the original data concurrently; 2) KL-MTL...
Grating coupler, as one of the key components can provide convenient on-wafer testing and packaging for integrated photonics. Silicon nitride (SiNx) grating coupler suffers from lower efficiency due to the relative low material refractive index. The efficiency of SiNx grating coupler can be improved by using high reflectivity silicon grating reflectors underneath. However, such silicon grating reflector...
In this paper, we propose a new consensus protocol in the form of distributed model predictive control (DMPC) in order to deal with the consensus problem of first-order discrete-time multi-agent systems. Equivalent form of general numerical solution of DMPC is presented by solving optimization problem, and necessary and sufficient convergence conditions of our proposed DMPC are obtained by using the...
The common PID controller with fixed parameters is difficult to control the speed of autonomous vehicle under changing operation conditions, thus a indirect single neuron adaptive PID controller based on quadratic criterion is put forward in this paper. The output error and control increment are assigned to be performance indexs in the learning algorithm. In order to further restrain the control increment...
Innovative mobile applications bring radical changes to people's life around the globe. With its unique characteristics of anywhere, anytime accessibility, thousands of mobile apps are developed, distributed, and executed over the Internet. To understand the selection criteria for different end users when facing a mobile application, this paper quests for an evaluation framework for mobile apps based...
In the light of insulation breakdown events during commissioning process of UHV GIS equipment in recent years, effects on switching overvoltage when closing no-load GIS bus caused by the pre-breakdown of the circuit breaker was researched in this paper. The conclusions of this paper could be used as reference for the design of AC-UHV GIS equipment and insulation accident prevention.
Based on the preliminary introduction of power demand response, this paper puts forward the problem in multi-level demand response reliable communication. Next, we analysis the principle of block chain technology, and then according to the characteristics of power demand response, the private block chain is chosen to solve the problem of mutual trust between users, load aggregators and power grids...
In order to solve the problem of high false detection ration and poor real-time performance in the automated and optical inspection of surface defect on cartridge case, a visually high-speed method was proposed. Taking a typical 9mm cartridge case of handgun as the object and considering its surface material, types of defect and detection method, an optical detection system was established on the...
One-bit quantization has become an important topic in massive MIMO systems, as it offers low cost and low complexity in the implementation. Techniques to achieve high performance in spite of the coarse quantizers have recently been advanced. In the context of array processing and direction-of-arrival (DOA) estimation also, one bit quantizers have been studied in the past, although not as extensively...
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