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In this paper, we propose a high gain ultrawideband microstrip antenna based on metamaterial structure. The designed antenna consists of a rectangle radiation patch etched T-shaped slots on the top layer, a ground plane with crossed shaped slots on the bottom layer and is fed by a 50 Ω microstrip line, the total size is 28 mm×2 mm, the thickness is 0.8 mm. The simulated results show that the impedance...
In the last decade, the research on terahertz imaging systems in CMOS has attracted extensive attention and gained rapid progress. Detection theory and performance indicators are first analyzed in this paper. System structures are then compared from three aspects. Finally, research progresses are reviewed and certain research directions are indicated on account of existing problems.
In this paper, we propose a framework which provides the temporal and spatial context for daily routine inferring in an ambient-assisted-living environment equipped with several sets of passive infrared (PIR) sensors. The inferred information could help identify the user's daily pattern and abnormalities from long-term monitoring. We implemented the prototype of the system from the electric parts...
There are many challenges in single-channel multi-person mixed speech separation, such as modeling the temporal continuity of the speech signals and improving the frame separation performance simultaneously. In this paper, a separation method based on Deep Clustering with local optimization by the improved Non-Negative Matrix Factorization (NMF) combined with Factorial Conditional Random Fields (FCRF)...
A physical model of revealing the charge carrier transport characteristics based on first-principles calculations has been proposed for oxide-based RRAM. Based on the proposed model, we have investigated the influence of different kinds of dopants on transport characteristics in HfO2-based RRAM. The present method will be contributed to clearly understand the dopant effect, and then tune the RRAM...
Anaerobic ammonium oxidation (anammox) process has been recognized as efficient biological nitrogen removal process, which has the advantages of cost-effective and low energy compared to the conventional nitrification and denitrification processes. However, the efficient operation and control is limited due to the complexity of nonlinear and biochemical phenomena involved. This paper proposes an appropriate...
A 60-GHz two-path phased-array transmitter (TX) with linearity enhancement techniques in 28nm CMOS technology is presented. The design is based on the all-RF architecture with buffer amplifiers (BA), 5-bit RF switched LC phase shifters, variable gain amplifiers (VGA), linearity enhanced power amplifiers (PA), bias circuit, serial peripheral interface (SPI). The two-way TX array achieves a 30dB gain...
The hybrid material of PI (with SiC whisker, SiC particle, AlN particle, and diamond particle) is proposed to satisfy the requirement of higher thermal conductivity for the high density package system. The thermal conductivity of the proposed hybrid materials with a moderate amount of doping can be improved to about 6–12 times. The hybrid films are fabricated by mechanical ball-milling process, high...
Discriminating Distributed Denial of Service (DDoS) from Flash Crowds (FC) is a tough and challenging problem, because there are many similarities between each other existed in network layer. In this paper, according to an extensive analysis of user traffic behavior of DDoS and FC, it can be found that some traffic abnormalities are existed between Bots and legitimate users. So a behavior-based method...
The requirements for lead-free electronics lead to the development of new Pb-free solders. The Sn-3.0-Ag-0.5Cu (SAC305) is one of them and is widely used in the lead-free solder market. But the melting point of it, 217°C, exceeds that of traditional Sn-37Pb solder. The lower melting temperature of lead-free solder are needed to meet the requirements of the manufacturing process that depend on conventional...
A fully integrated 68.1–73.8GHz E-band low phase noise quadrature phase-locked loop (QPLL) is proposed. The quadrature voltage-controlled oscillator (QVCO) with a symmetrical coupling network formed by diode-connected transistors is used to reduce the phase error. In order to improve the oscillation frequency and reduced the phase noise, a feedback network composed of buffer amplifiers and capacitors...
The operation reliability of power transformer will influence the safety and stability of power system directly. As a widely used technique, the dissolved gas analysis in oil is an effective measure to diagnose the abnormal condition of transformer. In this paper, a new dissolved gas analysis based transformer fault diagnosis method is proposed, which use meta-heuristic search algorithm, called cuckoo...
In fact, the blackbody furnace running in high temperature is a typical unsteady linear system which is discovered by experiment. Temperature control characteristic is changing with the internal temperature of the furnace. Conventional control methods can not meet the control demand which result in the fluctuation of the internal temperature. Therefore, this paper introduces a control method which...
The two-group comparison remains to be one of the most basic tasks in statistical analysis. In comparing the distribution of ordinal responses between two groups, Mann-Whitney Wilcoxon test is often used for hypothesis testing, while the proportional odds model is employed for characterizing the between group difference. This synthetic approach raises an important question that whether the results...
This paper uses Data Envelopment Analysis (DEA) to empirically analysis the efficiency of Beijing-Tianjin-Hebei traffic integration and the results are as follows. Firstly, the railway network is running well while the difficulties to alleviate the contradiction between supply and demand of the highway transport has existed for a long time, and the homogenization of competition in the port construction...
Wireless Sensor Networks (WSNs) is one of the front and research hotspot in the world, and it has been used more and more widely. But in the ground location, NLOS error which reduces the localization accuracy seriously has not been well-resolved. For this, a method based on K-means clustering algorithm and improved SA algorithm is proposed in this paper. The position function of unknown node based...
In recent years, the wireless sensor network (WSN) has become more and more popular, and the problem of WSN localization has attracted great attention. In non-line of sight (NLOS) propagation conditions, the localization is less accurate than in line of sight (LOS) propagation conditions because of the buildings between the mobile station and the base station obstruct the spread of waves. In order...
This paper mainly demonstrated the fail NMOS suffered lightly doped drain (LDD) & pocket (PK) implantation issue, suspect this loop defects induce the NMOS LDD&PK asymmetry partial missing. Device failure site was located by nano-probing. Based on electrical results, TEM energy-dispersive x-ray spectroscopy (EDX) images obtained from a cross-section, prepared at the designated location, showed...
In recent years, Hebei Province introduced a series of policies to encourage entrepreneurship. Entrepreneurship is the basic quality of entrepreneurs. This paper will use the econometric to analyze the effect of entrepreneurial spirit to Hebei Province on employment on the time series data, and put forward related advice. The empirical analysis shows that entrepreneurial spirit and innovative spirit...
When launching a new product to the market, in order to get the maximal profit, it is quite important to decide its selling price. This paper introduces a new multioligopoly model, in which the market price of a product is assumed to be an uncertain variable since it is lack of the historical data. Expected value operator and optimistic value approach are used to deal with the uncertainty in the model...
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