Electrocardiogram (ECG) signal feature extraction is important in diagnosing cardiovascular diseases. This paper presents a new method for nonlinear feature extraction of ECG signals by combining principal component analysis (PCA) and kernel independent component analysis (KICA). The proposed method first uses PCA to decrease the dimensions of the ECG signal training set and then employs KICA to cal-B Hongqiang Li Circuits Syst Signal Process culate the feature space for extracting the nonlinear features. Support vector machine (SVM) is utilized to determine the nonlinear features of the ECG signal classification. Genetic algorithm is also used to optimize the SVM parameters. The proposed method is advantageous because it does not require a huge amount of sampling data, and this technique is better than traditional strategies to select optimal features in the multi-domain feature space. Computer simulations reveal that the proposed method yields more satisfactory classification results on the MIT-BIH arrhythmia database, reaching an overall accuracy of 97.78 %.

(2014). High-performance binary blazed grating coupler used in silicon-based hybrid photodetector integration. Optical Engineering, 53 (9), 097106-1-097106-6.High-performance binary blazed grating coupler used in silicon-based hybrid photodetector integration AbstractAn efficient and high-performance binary blazed grating coupler was designed based on silicon-on-insulator (SOI) used for silicon-based hybrid photodetector integration in an arrayed waveguide grating demodulation integrated microsystem. A relatively high coupling efficiency was obtained to optimize mode matching by the finite-difference time-domain method by choosing appropriate grating parameters, including period, etching depth, and fill factor. Coupling efficiency output at 1550 nm for the TE mode reached 68%. This value was >60% in the wavelength range of 1450 to 1600 nm, specifically 71.4% around 1478 nm. An InP/InGaAs photodetector and SOI wafer were integrated by using benzocyclobutene (BCB) bonding. When the thickness of the BCB bonding layer was 440 nm, power absorption efficiency at 1550 nm for the TE mode reached 78.5%, whereas efficiency reached similar to 81.8% around 1475 nm. Abstract. An efficient and high-performance binary blazed grating coupler was designed based on silicon-oninsulator (SOI) used for silicon-based hybrid photodetector integration in an arrayed waveguide grating demodulation integrated microsystem. A relatively high coupling efficiency was obtained to optimize mode matching by the finite-difference time-domain method by choosing appropriate grating parameters, including period, etching depth, and fill factor. Coupling efficiency output at 1550 nm for the TE mode reached 68%. This value was >60% in the wavelength range of 1450 to 1600 nm, specifically 71.4% around 1478 nm. An InP/InGaAs photodetector and SOI wafer were integrated by using benzocyclobutene (BCB) bonding. When the thickness of the BCB bonding layer was 440 nm, power absorption efficiency at 1550 nm for the TE mode reached 78.5%, whereas efficiency reached ∼81.8% around 1475 nm. Disciplines Engineering | Science and Technology Studies IntroductionPhotonic integrated circuits allow the implementation of multiple optical functions on a single substrate, thereby reducing the cost and size of photonic systems. These features have attracted much attention in the last decades, facilitating the development of photonic integrated circuits for telecommunication applications. Si-based optoelectronic circuits 1 have attracted increasing attention because of their compact volumes and because of the high refractive index contrast of these waveguides. The large footprint and high price of the fiber Bragg grating (FBG) demodulation systems limit the promotion and application of optical FBG sensing technology. The results of our previous works on the array waveguide grating (AWG) demodulation system, which is a new kind of optical fiber grating demodulation scheme, show its suitability for optoelectronic integration.2 The system consists of an on-chip light source, ...

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Abstract. This paper is devoted to researching the routing reliability and router standby mechanism for smart and cooperation network. The method of updating and initiating the standby router has been also provided. With the aid of virtual interface, both the main router and standby router will be transparent to the network. Through Mini-Net simulated experiment, this paper has verified the mechanism. It is found that the mechanism of router standby can effectively cope with the network interruption caused by the failed router. It has the advantage of fast handoff and low latency.