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The stability problems of power electronics interfaced distributed generators with low inertia and damping can be well solved by the virtual synchronous generator technologies. However, when the grid voltages become unbalanced, oscillations in both the real and reactive power will arise with unbalanced voltages and currents of VSG being noticed. This paper proposed a flexible power control method...
According to China's space station operation and maintenance requirements, this paper first discusses the dual arm robot astronaut mission requirements and design principles. Then the robot's configuration, anthropomorphic robot arm and its driving joint, five fingered dexterous hand, head, neck and other mechanisms are designed in detail. A distributed control scheme for the robot is proposed. The...
The paper presents a method of the series arc fault for DC systems. The aim of the study is to find some current characteristics, which can be significant for the purpose of arc detection. The validity of the proposed method is testified by analyzing the arc fault current signal. The low voltage series DC arc study is carried out on the currents waveforms acquired during some tests on electric appliances...
For the vacuum arc, the parameters of the interelectrode plasma have influences on the electrode process. It is necessary to obtain the parameters and characteristics of the plasma by simulating the plasma among the electrodes. In this paper, based on the analysis of the existing vacuum arc model, combined with the characteristics of vacuum arc fault under different interrupting conditions, the effects...
We present our development of a spherical robot prototype that is designed to be completely enclosed, weatherproof, and capable of rolling holonomically on flat or inclined two-dimensional planes. By constantly shifting the robot's center of gravity in predetermined three-dimensional patterns, the corresponding two-dimensional trajectories can be mapped. Because we use only stepper motors to shift...
BGP measurement is important for monitoring and understanding the Internet anomalies. Most of the previous works on BGP measurement rely on aggregated statistics from BGP monitors, e.g., total updates. However, BGP events may have quite limited visibility. Therefore, merely investigating aggregated data may lead to misunderstanding Internet instability, e.g., overestimating the impact of monitor-local...
Superpixel segmentation refers to represent an image by small regions composed of pixels with the similar characteristics, which can carry more perceptual and semantic meaning than their simple pixel grid counterparts. Therefore, it is very important to distribute superpixels with different size over an image for describing image details. In this paper, a new superpixel generation method based on...
The severe rodent damage in Gurbantunggut desert forest may result in eco-environment destruction and desertification acceleration. However, little is known concerning the level of rodent hazard, spatial distribution and regularity of outbreak. This paper approached to use high-resolution imagery (TDOM and DEM) provided by Unmanned Aerial Vehicles (UAV) for rodent pests monitoring in desert forest...
Electric heating of the geothermal system first popular in western countries, the current has been very popular in the local is praised by the customers, on the one hand is convenient electric geothermal system, energy conservation, environmental protection, on the other hand, electricity geothermal systems rely on the power of radiation heating, alleviate the pressure of natural gas, geothermal system...
We present in this paper our development of a cyber physical sensing platform for monitoring the structural tension of large bridge cables using MEMS vibration sensors and proprietary wireless technology. In order to implement the online tension analysis of the bridge cables, we developed an improved technology for the general identification of cable tension using the Gauss-Newton method to determine...
A novel high-voltage interconnection (HVI) structure with dual trenches for 500V SOI-LIGBT is proposed in this paper. Compared with the conventional dual trenches structure, the proposed structure features a shallow trench (T1) and a deep trench (T2) beneath the HVI. By employing the shallow trench (T1), the potential can easily penetrate into the deep trench (T2) and the total potential sustained...
The previous surveys show that more than 90% of the flows in typical data center networks are smaller than 100KB in size, while most bytes transmitted are from a few large flows. The small flows are usually sensitive to their completion times while the large flows require a high throughput. The previous works usually either achieve low completion times for small flows or high throughput for large...
Measuring the instability of IP prefixes in BGP is critical for network operation and management. In particular, identifying and investigating the most active prefixes assist in detecting, analyzing, and understanding network problems. The traditional metric to assess the activeness of a prefix is the quantity of BGP update. However, this metric may be strongly affected by monitor-local events: the...
This paper presents a novel matching method by using bypass circuits in both input and output networks to design a tri-band active filter. Shunting proper bypass circuit can block each operation frequency. Both input and output matching networks are constructed with microstrip line in this tri-band design. The filter in this paper works at 900MHz, 1800MHz, and 2.4GHz. Experimental results show that...
Replacing of orbital replacement units by a manipulator has important significances in economic and safety aspects on space station. In this paper, the replacement task flow is analyzed in detail, and the manipulator's different working modes in the task are divided. Refer to different working modes, open loop path planning algorithm, vision-based close loop path planning algorithm and impedance control...
Many attempts have been made to detect and analyze anomalous Internet events through dissecting BGP updates and tables, and substantial progress has been made in detecting and quantifying the impact of major Internet disruptions. However, we notice that most works in this realm either deploy/use a limited quantity of monitors or analyze aggregated statistics, and such practice may result in overestimating...
A parametric CMOS passive frequency doubler is reported in this paper. The circuit is implemented in 180 nm CMOS but oses a conservative 0.5um gate length and produces an output between 150GHz and 162 GHz with a minimum measured conversion loss of 19.15 dB . The maximum output power is −26.9 dBm by −4.25dBm input power. The proposed design series a transmission line at the transistor source and series...
Because of its higher reliability, wider applicability and stronger security, multimodal biometrics has become a polar research direction of biometric recognition and attracts more and more research groups focusing on this area. Along with other fusion level of multimodal biometrics, feature level can reduce the redundant information to avoid calculation consumption, and simultaneously acquire the...
Glutamate (Glu) and gamma-aminobutyric acid (GABA) are very important neurotransmitters. They play critical roles in mental illness such as depression and schizophrenia. However, neurological bases and mechanisms of GABA for quantifying specific diseases or characterizing regional neural function remain poorly understood. In this study, MEGA-PRESS sequence was used to study the GABA concentration...
Anomalous BGP events can deteriorate Internet performance and connectivity thus have always been a research topic. However, most measurement works in this realm are prone to monitor-local events, namely, the events local to only few BGP monitors. Besides, events that are widely observed can also have negligible impact, e.g., prefix-local events. In contrast, a Large-scale BGP Event (LBE) makes a large...
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