检索结果-南通市图书馆

An Integrated Approach for Fetal Heart Rate Estimation from Abdominal Electrocardiogram Signal

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2019年第6期28卷 1198-1203页

作者： wei Xueyun zheng wei School of Electronic Information Jiangsu University of Science and Technology

This paper introduces an integrated approach to estimate the fetal heart rate from the abdominal Electrocardiogram(ECG) signal. Empirical mode decomposition(EMD) can decompose the fetal ECG signal into a set of intrinsic mode functions, which can be used as the indicator of the occurrence for the fetal heartbeats. The decomposition basis functions are directly derived from the fetal signal under test, which make the detection process robust and adaptive. Multiple signal classification(MUSIC) is a high resolution algorithm for frequency estimation, which can be applied to the fetal heartbeats indicator sequence output from the preceding EMD, estimating the fetal heart rate in frequency domain without the heartbeat wave detection. Compared with the popular Independent component analysis(ICA) method,the proposed method has shown improved robustness and fidelity in estimation of the fetal heart rate during testing with real fetal ECG database from Da ISy and Physio Net.

关键词： Fetal heart rate estimation Nonstationarity signal analysis High resolution spectrum estimation

Rational design of multi-targeting ruthenium-and platinum-based anticancer complexes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2016年第10期59卷 1240-1249页

作者： wei zheng Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Analytical Chemistry for Living BiosystemsNational Centre for Mass Spectrometry in BeijingInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beo'ing 100049China

Platinum-based anticancer drugs, including cisplatin and its analogues, have played important roles in the clinical treatment of solid tumors over the past 38 years. However, poor selectivity, high toxicity and intrinsic or acquired drug resistance profoundly limit their application, which encourages the development of novel transition metal-based anticancer agents with different mechanisms of action. To this end, transition metal complexes that can simultaneously act on more than one target, termed as single-molecule multi-targeting complexes, have attracted increasing attention because of their enhanced efficacy and diminished chance of drug resistance. In this review, we systematically discuss the recent progress in the development of platinum- and ruthenium-based anticancer agents, in particular the rational design of platinum and ruthenium complexes with multi-targeting features.

关键词： anticancer agents metal complexes multi-targeting EGFR-inhibition DNA binding

Convergence analysis for delay Volterra integral equation

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2022年第2期37卷 306-316页

作者： zheng wei-shan College of Mathematics and Statistics Hanshan Normal UniversityChaozhou 521041China

In this article we use Chebyshev spectral collocation method to deal with the Volterra integral equation which has two kinds of delay items. We use linear transformation to make the interval into a fixed interval [-1, 1]. Then we use the Gauss quadrature formula to approximate the solution. With the help of lemmas, we get the result that the numerical error decay exponentially in the infinity norm and the Chebyshev weighted Hilbert space norm. Some numerical experiments are given to confirm our theoretical prediction.

关键词： Chebyshev spectral collocation method delay Gauss quadrature formula convergence analysis

Freezing the kinase signaling of breast cancer with transformable peptide nanoparticles

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2020年第8期63卷 1021-1022页

作者： Di-wei zheng Xian-zheng Zhang Key Laboratory of Biomedical Polymers of Ministry of Education&Department of Chemistry Wuhan UniversityWuhan 430072China

Protein kinases have been recognized as dominant regulators of all aspects of tumor progression,including tumorigenesis,proliferation,invasion,and metastasis[1].During the activation of protein kinases,the binding of ligands(e.g.,epidermal growth factor,transforming growth factor-α,and amphiregulin)can cause dimerization,which promotes the cell growth and triggers a cascade of downstream signaling pathways.

关键词： invasion metastasis breast

Stochastic Volatility Model and Technical Analysis of Stock Price

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2011年第7期27卷 1283-1296页

作者： wei LIU wei An zheng Department of Statistics Shanghai Finance University Shanghai 201209 P. R. China Department of Statistics East China Normal University Shanghai 200062 P. R. China

In the stock market, some popular technical analysis indicators （e.g. Bollinger Bands, RSI, ROC, ...） are widely used by traders. They use the daily （hourly, weekly, ...） stock prices as samples of certain statistics and use the observed relative frequency to show the validity of those well-known indicators. However, those samples are not independent, so the classical sample survey theory does not apply. In earlier research, we discussed the law of large numbers related to those observations when one assumes Black-Scholes＇ stock price model. In this paper, we extend the above results to the more popular stochastic volatility model.

关键词： Stochastic volatility model asymptotic stationary process law of large numbers convergence rate technical analysis indicators

Shipborne radar maneuvering target tracking based on the variable structure adaptive grid interacting multiple model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第9期14卷 733-742页

作者： zheng-wei ZHU School of Information Engineering Southwest University of Science and Technology Mianyang 621010 China

The trajectory of a shipbome radar target has a certain complexity, randomness, and diversity. Tracking a strong maneuvering target timely, accurately, and effectively is a key technology for a shipbome radar tracking system. Combining a variable structure interacting multiple model with an adaptive grid algorithm, we present a variable structure adaptive grid inter- acting multiple model maneuvering target tracking method. Tracking experiments are performed using the proposed method for five maneuvering targets, including a uniform motion - uniform acceleration motion target, a uniform acceleration motion - uni- form motion target, a serpentine locomotion target, and two variable acceleration motion targets. Experimental results show that the target position, velocity, and acceleration tracking errors for the five typical target trajectories are small. The method has high tracking precision, good stability, and flexible adaptability.

关键词： Shipbome radar Target tracking Variable structure Interacting multiple model Adaptive grid algorithm

On-surface synthesis and characterization of polyynic carbon chains

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2024年第3期11卷 192-199页

作者： Wenze Gao wei zheng Luye Sun Faming Kang zheng Zhou wei Xu Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University

Carbyne, an elusive sp-hybridized linear carbon allotrope, has fascinated chemists and physicists for decades. Due to its high chemical reactivity and extreme instability, carbyne was much less explored in contrast to the sp2-hybridized carbon allotropes such as graphene. Herein, we report the on-surface synthesis of polyynic carbon chains by demetallization of organometallic polyynes on the Au（111） surface;the longest one observed consists of ～60 alkyne units（120 carbon atoms）. The polyynic structure of carbon chains with alternating triple and single bonds was unambiguously revealed by bond-resolved atomic force microscopy. Moreover, an atomically precise polyyne, C14, was successfully produced via tip-induced dehalogenation and ring-opening of the decachloroanthracene molecule(C14Cl10) on a bilayer NaCl/Au（111） surface at 4.7 K, and a band gap of 5.8 eV was measured by scanning tunnelling spectroscopy,in a good agreement with the theoretical HOMO–LUMO gap（5.48 eV）.

关键词： polyyne scanning probe microscopy carbon allotrope on-surface synthesis organometallic polyyne

FBCRI Based Real-time Path Planning for Unmanned Aerial Vehicles in Unknown Environments with Uncertainty

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

机器人 2013年第6期35卷 641-650页

作者： LIU wei HAO Peng zheng zheng CAI Kaiyuan School of Automation Science and Electrical Engineering Beihang University Science and Technology on Aircraft Control Laboratory High-Tech Institute of Xi'an

This paper presents an FBCRI(feedback based compositional rule of inference)based novel path planning method to satisfy the requirements of real-time navigation,smoothness optimization and probabilistic obstacle *** local path-searching behaviors in regional ranges and global goal-seeking behaviors in holistic ranges,the method infers behavior weights using fuzzy reasoning embedded with feedback,and then coordinates the behaviors to generate new reference *** view of the deterministic decisions and the uncertain states of a UAV(unmanned air vehicle),chance constraints are adopted to probabilistically guarantee the UAV’s safety at a required *** results in representative scenes prove that the method is able to rapidly generate convergent paths in obstacle-rich environments,as well as highly improve the path quality with respect to smoothness and probabilistic safety.

关键词： unmanned aerial vehicle path planning fuzzy reasoning FBCRI(feedback based compositional rule of inference) uncertainty

Accurately tracking hypersonic gliding vehicles via an LEO mega-constellation in relay tracking mode

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2024年第1期35卷 211-221页

作者： LI Zhao WANG Yidi zheng wei College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China

In order to effectively defend against the threats of the hypersonic gliding vehicles(HGVs),HGVs should be tracked as early as possible,which is beyond the capability of the ground-based *** benefited by the developing megaconstellations in low-Earth orbit,this paper proposes a relay tracking mode to track HGVs to overcome the above *** whole tracking mission is composed of several tracking intervals with the same *** each tracking interval,several appropriate satellites are dispatched to track the *** that are planned to take part in the tracking mission are selected by a new derived observability *** tracking performances of the proposed tracking mode and the other two traditional tracking modes,including the stare and track-rate modes,are compared by *** results show that the relay tracking mode can track the whole trajectory of a HGV,while the stare mode can only provide a very short tracking ***,the relay tracking mode achieve higher tracking accuracy with fewer attitude controls than the track-rate mode.

关键词： target tracking mega-constellation hypersonic gliding vehicle(HGV) sensor selection observability analysis