The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Histogram-based similarity has been widely adopted in many machine learning tasks. However, measuring histogram similarity is a challenging task for streaming data, where the elements of a histogram are observed in a streaming manner. First, the ever-growing cardinality of histogram elements makes any similarity computation inefficient. Second, the concept-drift issue in the data streams also impairs...
With the wide adoption of social networks, people are accustomed to post their ideas and thinking via these platforms. Tweets or comments online usually come with individual sentiment, which are time consuming to be analyzed by human labor. This study encapsulates a prototype Chinese sentiment mining system and takes a global hotel reviewing website TripAdvisor as the evaluation sample. The proposed...
This paper presents a novel MEMS-based integrated current and voltage sensor for the measurement of voltage and current in power distribution networks. It adopts three-dimensional (3D) induction coil as current sensor and two asymmetric sensing electrodes as voltage sensor to detect voltage and current simultaneously. A micromachining fabrication process is proposed to fabricate the integrated current...
Almost all existing relevant literatures are focused on the multi-inverter system that only contains one type of inverter. Till now, the interactions in multi-inverter system consisting of polytype inverters have been not investigated systematically. To fill this gap, the paper is aimed at the stability study of the generic system containing multiple types of inverters. The mathematic model of interactions...
Wide-band-gap devices can provide much faster switching speed. But the dv/dt of switching node voltage also becomes much higher, causing potential common mode noise issue. On the other hand, PCB winding transformer has significant large inter-winding capacitance, which provides a low impedance path for common mode noise. In this paper, a symmetrical resonant converter as well as a symmetrical PCB...
Harmonic resonances around the intersection frequency is triggered with the stability margin decreasing to zero and the system will be unstable with the stability margin reducing to be negative. For suppressing harmonics, the phase difference between the inverter admittance and grid admittance should be lower than 120° at their intersection. Based on this principle, a phase-reshaping strategy aiming...
This paper presents a fast-response full-wave inductor current sensor for a DC-DC converter operating in 10 MHz switching frequency. It can achieve high sensing accuracy better than 93% with inductor current varying from 100mA to 2.1 A. Also, the time response of proposed current sensor has been greatly improved and achieved < 8 ns for sensing full wave inductor current with a low transition spiking.
In order to improve the adaptation of quadruped robot for various terrains, the major problem is how to build up the smooth transition algorithm from trotting gait suitable for flat terrain to walking gait suitable for rugged terrain. Firstly, one gait cycle of trotting gait and walking gait are analyzed for finding out all the potential switch points and access points. Secondly, based on analysis...
A distributed feedback semiconductor optical amplifier (DFB-SOA) based optical vector network analyzer (OVNA) is proposed. The proposed OVNA is realized by mapping the transmission response of the optical device under test (ODUT) into electrical domain. The key principle of the OVNA is the optical carrier recovery resulted by the DFB-SOA. Using the proposed OVNA, the transmission spectrum of an optical...
The dual active bridge (DAB) topology has been widely used in the industrial field, especially when bidirectional power transfer is required. However, the efficiency improvement of DAB converters is facing challenges and it is worthwhile devoting much effort to it. This paper presents a novel model based on the triple phase shift (TPS) modulation scheme to improve the efficiency of the dual active...
In order to solve the problem of ECG signal detection, wireless sensor network is designed with ZigBee technology. This article describes the details of the system structure, the design of hardware and software and the communication methods. we can realize wireless detection of human ECG signal through the wireless sensor system. Design the host computer software system based on Qt framework can achieve...
Because of the nonlinear power output of photovoltaic cells and the influence of external environment factors [1,2], a photovoltaic power point maximum power point tracking (MPPT) device is designed based on adaptive perturbation observation method. This paper introduces the hardware design of the device, according to the proposed adaptive algorithm arithmetic which is programmed to control the corresponding...
As the walking speed of the discontinuous crawl gait of the quadruped robot is rather slow, an optimized method is proposed for improving the forward walking velocity. To ensure the walking stability, the adjustment process of the center of gravity (COG) of the robot is divided in two types, lateral movement and forward movement respectively. Based on the definition of the inner support polygon, the...
Connected automated vehicles are now moving towards reality. With the help of advanced artificial intelligence and vehicle-to-vehicle/ vehicle-to-infrastructure communication, connected automated vehicles can keep higher speed with shorter headway, and drive with neighboring vehicles to formulate platoons. The application of connected automated vehicles will change the relationship of traffic flow...
In this paper, the control problems of the permanent magnet synchronous motor (PMSM) system are investigated extensively. Some single input controllers were proposed to realize the control problems of such system, such as stabilization, synchronization, coexistence of anti-synchronization and synchronization, projective synchronization. It is noted that there exist two different single input controllers...
To meet the higher requirements of human-machine interface technology, the quadruped robot with human recognition capability is discussed in this paper. We present a marker tracking system which uses laser scanner and pan-tilt to allow a particular user to designate himself as the robot's leader. Optimal motion curve of pan-tilt is planned so as 3D point clouds can be returned by a rotating 2D laser...
We propose a theoretical study on dual-frequency conformai antenna made by carbon nanotubes (CNTs) which is suitable to be printed on commercially available paper substrate. According to the simulation result, it is found that the radius of the conformal cylindrical surface and the conductivity of CNTs contribute little to the antenna performance. By further integrated onto the textile substrate,...
This paper proposes a terahertz(THz) circularly polarized quasi-diagonal horn antenna, which is composed of several etched silicon layers. Through adding the antipodal transition structure, we can obtain good circular polarization performance. The simulated result reveals that the bandwidth for axial ratio below 2dB from 490 GHz to 500 GHz. The return loss below −23dB from 490GHz to 500GHz. Good symmetric...
As an important scenario for indoor coverage, the space-time characteristics of the wireless channels inside a gymnasium are investigated in this paper. By using a 3-dimensional sounder with two crossed, dual-polarized linear antenna arrays, the large-scale parameters (LSPs) such as root-mean-square azimuth/zenith spread of arrival (ASA/ZSA), delay spread (DS), and Rician Κ factor of the channels...
The maximum likelihood (ML) estimation for multipath component (MPC) parameters requires high computational complexity, resulting in low efficiency in channel measurement campaigns. In this paper, a new method, called Fast Reduced-Dimension SAGE (FRDS) algorithm, is proposed to estimate the parameters such as excess delay, power, and angle-of-arrival/departure (AoA/AoD). By sounding channels using...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.