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Non-invasive blood glucose measurement is a crucial challenge in both academic and industry communities. Currently, most of non-invasive solutions are developed based on optical signals. However, their accuracy is still far from clinical requirements if these measured optical signals directly used to estimate corresponding glucose levels. To solve this challenge, a novel Back-propagation Monte Carlo...
Numerous crime-related security concerns exist in e-commerce transactions recently. User authentication for mobile payment has numerous approaches including face recognition, iris scan, and fingerprint scan to identify user's true identity by comparing the biometric features of users with patterns in the signature database. Existing studies on the face recognition problem focus mainly on the static...
Recently, as the evolution of application's development and management paradigms, the deployment declaration becomes a standard interface connecting application developers and Cloud platforms. Kuberenetes is such a system for automating deployment, scaling, and management of micro-service based applications. However, managing and operating such a cloud benefit with additional complexities from the...
In China, "Special Equipment" refers to boilers, pressure vessels (including gas cylinders), pressure pipelines, elevators, lifting appliances, passenger ropeways, large amusement devices, and non-road vehicles, which have high risks. The safety supervision to special equipment in China has been implemented for over 60 years, how to change the function and position of government to reform...
A compact dual-band rectangular ring printed antenna for wireless local area network (WLAN) applications is proposed and investigated in this paper. The dual-band is realized by using a rectangular ring patch connected with a 50Ω mini-coaxial feed structure composed of a longitudinal slot and a small rectangular, occupying a small board space of 30.6mm∗6mm on the system circuit board. With a modified...
This paper presents a planar monopole antenna with dual-band character for WLAN/Wi-Fi application. It can obtain the impedance bandwidths of 2.30–2.49 and 4.70–5.90 GHz with S11 less than −10 dB. The overall dimension of this antenna is 30 × 26mm 2. The antenna is printed on the substrate of FR4 with two “C”-shaped strips and a microstrip feed line on the front side and the ground plane on the flip...
This paper proposes a transformer-less modular multilevel DC/DC converter. The proposed converter can be used to interconnect two HVDC systems with different dc voltage levels and realize bidirectional power flow. Based on the arm energy balance condition, the optimal design arming at minimum inner circulating current is presented. A power close-loop control method is adopted to regulate the converter...
Modular multilevel converter (MMC) has been proved a prospective topology in high voltage and high power occasions. Hybrid MMC mixed with half-bridge (HB) and full-bridge submodules (FBSMs), which achieves a good tradeoff between power devices quantity and dc short circuit fault handling capability, attracts extensive attention. In this paper, the characteristics of SM capacitor voltage ripples are...
As the penetration level of wind power increases, displacing conventional power generation with wind power will reduce the inertia of power system and decrease the frequency stability. Energy storage devices with only 5% energy storage of wind farm's rated capacity can produce the same virtual inertia as a same capacity synchronous generator. To reduce the additional costs of individual energy storage...
Real-time simulation of modular multilevel converter (MMC)-based HVDC is one of the most important and difficult technologies in the area of power electronics research. This paper presents a methodology for the hardware in loop (HIL) CPU/FPGA-based real-time simulation of a one-terminal MMC HVDC of up to 468 levels using a detailed equivalent model, and the simulation system is based on full-scale...
This paper applies the DEA model to measure the innovation efficiency of the regional high-tech industry, domestic, Hong Kong, Macao and Taiwan and foreign-invested enterprises in China between 2008 and 2014. The results show that: (i) from the whole, if the differences in enterprise nature is not considered, the average innovation efficiency of China's high-tech industry is 0.748, and the pure technical...
For medium- to high-voltage AC/AC conversion applications, direct AC/AC conversion scheme by adopting the modular multilevel converter (MMC) shows remarkable advantages on costs and efficiency compared with the AC/DC/AC solution which employs a back-to-back MMC configuration. However, direct AC/AC MMC suffers from branch energy instability when conversion frequencies of input and output are equal...
Modular multilevel converter (MMC) has attracted great attention in the high voltage direct current (HVDC) transmission systems. Redundant submodules (SMs) are usually set to enhance the reliability of MMC. However, if some SMs break down, the arm energy is unbalanced and fundamental fluctuation appears in the DC current. This paper proposes an arm energy rebalancing control scheme to suppress the...
Hybrid transmission systems associated with line commutated converters (LLC) and voltage source converters (VSC) have gradually become a particular solution for high voltage direct current (HVDC) transmission. The full-bridge submodule (FBSM) based modular multilevel converter (FB-MMC) has gained significant attention for its dc voltage reversal and fault ride through capabilities. However, large...
Because the numerous nonlinear components and fiber interfaces are used in Module Multiple Converter (MMC), the HIL test of MMC with detailed EMT model and the full-scale interface is hard to be implemented. In recent years, this existing disadvantage caused the MMC controller hardware and software difference between the HIL test and real project. In this paper, a detailed EMT model of hybrid MMC...
In this paper, a novel configuration of the back-to-back (BTB) converter interconnecting two synchronous AC grids is proposed. The feature of this BTB converter configuration is the substantially reduced capacity compared with the exchanged power between the two grid partitions. Unlike the conventional full-capacity BTB converters, the capacity of the proposed BTB converter in this paper is around...
Speech feature learning is very important for the design of classification algorithm of Parkinson's disease (PD). Existing speech feature learning method for classification of PD just pays attention to the speech feature. This paper proposed a novel hybrid feature learning algorithm which puts the features of all the speech segments of each subject together, thereby obtaining new and high efficient...
This paper applies the DEA model to measure the innovation efficiency of the regional high-tech industry, domestic, Hong Kong, Macao and Taiwan and foreign-invested enterprises in China between 2008 and 2014. The results show that: (i) from the whole, if the differences in enterprise nature is not considered, the average innovation efficiency of China's high-tech industry is 0.748, and the pure technical...
The information transmission problem in a class of wireless multi-user single-antenna half-duplex relay interference networks is studied. In these networks there are multiple clusters of sources. All the terminals in each source cluster desire to transmit independent messages to a single destination, through multiple layers of intermediate half-duplex relays. We adopt a cluster successive relaying...
In this paper, a downside risk constrained optimal reactive power dispatch control (ORPDC) model is proposed, with the consideration of uncertain wind power integrated into power systems. In this model, the expectation of transmission loss and its downside risk are considered, simultaneously. In this way, the proposed model is formulated as a multi-objective optimization problem. Then we introduce...
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