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In this paper zero-vector intervals of eight-segment PWM scheme based on space vector modulation (SVM) is optimized for three-phase isolated buck matrix-type rectifier. With the proposed non-equally distributed zero-vector intervals of eight-segment PWM scheme, the output inductor current ripple of the converter is reduced comparing to that of the equally distributed zero-vector intervals. The steady...
This paper presents an Unscented Kalman filter (UKF) based algorithm for estimating available bandwidth in a space Disruption-Tolerant Network (DTN) link. In the proposed algorithm, an UKF model is proposed for accurately tracking available bandwidth of bundle delivery over a space link. In particular, the proposed UKF will iteratively filter a serial of noised measurements on successive time intervals,...
Excited state fluorescence lifetimes of near-infrared fluorescent proteins iRFP682 and iRFP713 engineered from bacterial phytochromes were measured with a time-resolved flow cytometer. Average lifetimes ranged between 0.5 and 1.0 ns for n=5000 bacterial cells. We anticipate cell sorting for screening cells expressing mutated iRFP variants of high quantum yield.
The energy efficiency of WSN is important to determine whether a WSN can be widely and reliably deployed and applied. The fundamental problem is to lessen the energy consumption produced by the communication modules of WSN nodes. This paper analyzes and solves the problem from the perspective of how to design efficient data aggregation method. It aims to reduce the data quantity to be collected through...
Cyber-Physical System (CPS, shortly) is a fusion systems of computing and physical processes. It is a highly integration of computation, communication and control in the framework of networked embedded system. In this paper, we analyze the concept and feature of CPS and propose a graphical hierarchical architecture for CPS. It is a graphic network structure within the same layer and a hierarchical...
Energy efficiency and load balance of Wireless Sensor Network (WSN) is the key to ensure its extensive and reliable deployment, and the fundamental problem is about how to control the energy consumption of communication module on the WSN node. This paper attempts to analyze and solve problems on the perspective of how to design efficient and balanced data collection methods. The amount of data to...
Nowadays, Device-to-Device (D2D) communication in LTE system has been proposed as a possible candidate for vehicle-to-vehicle(V2V) communication. As V2V communications share the same licensed frequency spectrum pool with typical UEs communications in one LTE cell, efficient radio resource allocation is a challenging issue. In this paper, we proposed a traffic flow based dynamic resource allocation...
The study of Restricted Boltzmann Machine(RBM) attracts considerable attentions in recent years. RBM training algorithm is an unsupervised learning method with many applications, moreover, it is the basic module in deep learning. Maximizing the log-likelihood by gradient ascent method, RBM training algorithm can approximate the probability distribution underlying the observing data. For a simple RBM...
In this paper, a new common capacitor current sharing method is proposed for multi-phase LLC resonant converter. Automatic current sharing is achieved by using a common resonant capacitor for all the LLC resonant stages, by connecting the resonant capacitors in each phase in parallel. The proposed method can automatically share the load current without any additional circuits and control strategy...
This paper proposes a new half bridge (HB) LLC resonant converter with pulse width modulated (PWM) auxiliary switch (sLLC converter) for hold-up mode operation. The proposed sLLC converter works with synchronous rectifier (SR), which is suitable for low output voltage applications. The magnetizing inductor can be designed with large value to reduce the circulation loss. In the proposed sLLC converter,...
An algorithm based on new circulated current model is proposed to analyze the circulating current in the multiphase LLC converter. First of all, a virtual-open concept is introduced and LLC phases are decoupled from each other, Thus, A circulating current model can be achieved from fundamental harmonic approximation (FHA). Secondly, the ac voltages on the equivalent resistor of different phases are...
In this paper a PWM method for zero voltage switched three-phase isolated rectifier is presented. The presented PWM scheme features lower maximum output inductor current ripple and lower duty-cycle loss by more than half. Therefore, a smaller output inductor can be used and the ZVS operation can be extended at wider load range for MOSFET devices by increasing the leakage inductance of the transformer...
Disruption-Tolerant Networks provides store-and-forward enabled routing strategies for the satellite networks with frequently intermittent links. However, current dynamic route selection algorithm (DRSA), including Contact Graph Routing (CGR) algorithm, could not find an end-to-end route over a serial of link segments with time-disjointed contacts. In this paper, we proposed a novel routing algorithm...
In the space Disruption-Tolerant Network (DTN), high-speed relative motion between the spacecraft-piggybacking nodes leads to rapid changes of link range, which incurs the time-varying properties of such channel parameters as Signal-to-Noise Ratio (SNR) and One-Way Light Time (OWLT). In this paper, we propose a joint optimization algorithm for bundle and segment sizes, which can update optimal sizes...
The Low Earth Orbit (LEO) satellites for Earth observation confront intermittent connection and high packet-loss rate, which significantly limits the returns of scientific data due to non-continual short-time windows. Disruption-Tolerant Networking (DTN) provides an alternative approach for networking for the Earth observation (EO) constellation, which could exploit adequately each short-time contact...
In the space Disruption-Tolerant Networks (DTNs), bundles are forwarded to next node only after their complete recovery, which leads to inefficiency exploiting of the next-hop precious contact. To solve this problem, this paper proposes an expedited mechanism of bundle delivery, which could achieve fast forwarding at the intermediate node by segments aggregation. The simulation results show that the...
This paper introduces a domain Spatio-Temporal Consistency (STeC) language for the application domain of space-air-ground integrated networks. The STeC language is taken as the foundation of modeling our systems, bacause it works well on specifying real-time systems concerning not only the time characteristic but also the location characteristic and the consistency between them. In this paper, a domain-STeC...
The zero-voltage switched (ZVS) PWM converter exhibits low primary-side switching loss and generated EMI. Furthermore, the ZVS technique can be used to increase the converter efficiency and higher power density. In this paper the ZVS operation of the MOSFET switches leveraged for a three-phase, isolated AC/DC converter is analyzed and operating states during the switch transitions discussed. The presented...
Spatial modulation is a kind of MIMO transmission technology, which can reduce the internal channel interference of communication system and has low signal detection complexity. In this paper, to improve the reliability of the spatial modulation system, a transmission scheme using multiple auxiliary antennas for spatial modulation system with space-time block code (STBC-ASM) is proposed. Numerical...
Multiple Active Spatial Modulation (MA-SM) is a promising transmission technology for Multiple Input Multiple Output (MIMO) system. In this paper, a linear list detection algorithm for MA-SM is proposed to trade off the performance and the complexity. The detection of the sub-set of the transmit antennas is firstly performed, resulting in a list of the best candidates. Then the constellation symbol...
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