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Traffic retention is an important factor of intelligent transportation system, which can vividly reflect current state of the road. Accurate estimation of traffic retention can provide support for the dynamic allocation of the traffic signal, thus alleviating the problem of urban traffic congestion. The traditional method can only estimate the long-term or red light traffic retention according to...
Hybrid AC/DC microgrid (MG) has attracted more and more attention due to its advantages such as better power sharing, improved system dynamics, and optimal management. But the complicated structure brings a great challenge to the modeling and stability analysis. In recent years, dynamic phasor model has been well applied in the modeling of AC MGs. Dynamic phasor tranforms sinusoidal quantities to...
In order to accurately simulate vehicles' running states of lane changing and more effectively reflect its characteristics, based on the driving experience, this paper introduced three changing rules and their corresponding lane changing benefits and safety factors, and summarized the lateral and longitudinal motion of vehicles as the interaction result between lane changing benefits and safety factors...
The influence factors of underwater acoustic propagation are the foundation of underwater acoustic communication. In this paper, a realistic underwater acoustic channel is modeled in the South China Sea. Three kinds of typical sea surface models with curvilinear boundaries are selected for the investigation by the BELLHOP ray model. Under different restrictions, the characteristics of the channel...
The rise of the network economy and E-commerce has pushed the rapid development of logistics market. The Multi-tier Shuttle Warehousing System (MSWS) as a new autonomous unit load storage/retrieval system, which flexibility and work efficiency is much-improved compared with the conventional AS/RS, has attracted more and more attention of logistics enterprises both at home and abroad. MSWS is composed...
In the modern industry, human-robot collaboration is becoming more and more important. With the quick development of the small production, the demand of flexibility is growing heavily. Gesture recognition is important for the collaborative work of humans and robots. In industrial applications, the performance of such systems affects the safety of human workers and their manufacturing efficiency. In...
This paper presents a chaotic analysis method based on adjacent data dependence, which is based on the distance change between adjacent data. The method converts complex one-dimensional raw data columns into new adjacent distance value sequences to avoid phase space reconstruction. In this paper, several typical chaotic models are analyzed to illustrate the effectiveness of the proposed method. Finally,...
Coil optimization design is the key technology of transcranial magnetic stimulation applications. In order to design the coils of different specifications, the optimization design and simulation system of transcranial magnetic stimulation coil was developed based on VB and Maxwell Ansoft. The software developed in this paper can be used to calculate inductance of the coil with different parameters,...
As solid oxide fuel cell (SOFC) systems fueled with natural gas and biogas are applied widely, the capture and utilization of CO2 in SOFC exhaust gas are important issues. This paper proposes a new SOFC system combined with a solid oxide electrolysis cell (SOEC) stack, which absorbs renewable electrical power such as solar power and wind power to convert CO2 in SOFC exhaust gas into fuel by electrolysis...
We present a framework to analyze various aspects of models for video question answering (VideoQA) using customizable synthetic datasets, which are constructed automatically from gameplay videos. Our work is motivated by the fact that existing models are often tested only on datasets that require excessively high-level reasoning or mostly contain instances accessible through single frame inferences...
Current methods to compare measurement series are based on the comparison of multiple measurement points or fit parameters. These approaches depend on the quality of the fit and are prone to type I error accumulation, when standard statistical tests are used for evaluation. In this work, we present an approach based on a two-sample Kolmogorov-Smirnov test of residuals of data series to a fit in order...
This paper presents the first phase shifter based on sol-gel Barium Calcium Zirconate Titanate (BCTZ) thin ferroelectric film. It is a coplanar waveguide distributed phase shifter with BCTZ varactors used as tuning elements. It presents a continuous phase shift of 285° at 12 GHz (180° at 8 GHz) with a 20 V bias voltage. Its figure of merit is 26°/dB and its return loss is better than 12 dB for the...
Models for active devices operating in a nonlinear regime are an indispensable tool for modern RF-circuit design. A popular class of large signal models are X-parameters which offer an accurate description of nonlinear devices. However, they require a specialized measurement setup. Typically nonlinear vector network analyzers (NVNA), are used to conduct the measurements required for an X-parameter...
This work proposes an analytical method for calculating sensitivity index. The proposed method is based on one-at-a-time measurements and calculates the difference between output values and the base solution to define the impact caused by each parameter in the system. The results indicated that the analytical method provides adequate values for the sensitivity index even when the parameters have minor...
A novel method has been developed that uses an equivalent circuit model with lumped elements to design a miniaturized Frequency Selective Surface (FSS), which is based on the theory of meta-materials. Specifically, the equivalent circuit model is introduced to simplify the design of the miniaturized FSS without using numerical analyses such as the method of moments (MoM), finite-difference time-domain...
Quantifying the dynamic and the evolution of an electrical power distribution system is an important task in operational and planning studies, where some of the issues addressed is to measure the growth of the electrical demand, with special attention to residential consumption due to its randomness. An adequate representation will ensure valid results for future prediction of the system behaviour...
The hybrid analysis of mode matching/FEM (MM/FEM) is applied to a waveguide short-slot 2-plane coupler. The analysis model is reduced to the one-eighth model by considering the three-dimensional structural symmetry. The analysis results agree well with those by HFSS.
The reliability aspect study of Modular Multilevel Converter (MMC) is of great interest in industry applications, such as offshore wind. Lifetime prediction of key components is an important tool to design MMC with fulfilled reliability specifications. While many efforts have been made to the lifetime prediction of IGBT modules in renewable energy applications by considering long-term varying operation...
Modular Multilevel Converter (MMC) has great application prospects for the flexible HVDC transmission, high-power motor drive and so on. In this paper, a discrete-time model of the MMC based on the virtual ergodic method is proposed for the typical MMC topology. First, the MMC topology is analyzed and its continuous-time model is established. Then, the state equation in the continuous-time model is...
Photovoltaic (PV) power generation's advantage of mitigating fossil energy consumption and environment friendly results in its widespread utilization. However, inaccurate PV output prediction will cause problems of dispatching, stability and reliability in power system. PV output is directly affected by the solar irradiance. Without solar irradiance monitoring facilities and only relying on the basic...
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