检索结果-南通市图书馆

Parameter Estimates in Random Intercept Mixed Effects Model for Repeated Measures

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第4期23卷 685-696页

作者： Yah SUN gen Xiang CHAI School of Economics Shanghai University of Finance and Economics Shanghai 200433 P. R. China Department of Applied Mathematics Tongji University Shanghai 200092 P. R. China

In this article the following random intercept mixed effects model will be considered： yij = vi =v^τijβ＋ εij,i=1,…,m;j=1,2,…,ni, where {vi} are i.i.d, random effects with mean α 2. 2 and finite variance σ^2 v, {εij} are i.i.d, random errors with finite variance ε^2 ε. Here we will estimate α,σ^2 v,σ^2 ε,β and study their large sample properties, such as strong consistency, strong convergence rates and asymptotic normality.

关键词： Repeated measures Random effects Convergence system Strong convergence Strong convergence rate

Bootstrap Approximation of Wavelet Estimates in a Semiparametric Regression Model

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2010年第4期26卷 763-778页

作者： Liu gen XUE Qiang LIU College of Applied Sciences Beijing University of Technology Beijing 100124 P. R. China School of Statistics Capital University of Economics and Business Beijing 100070 P. R. China

The inference for the parameters in a semiparametric regression model is studied by using the wavelet and the bootstrap methods. The bootstrap statistics are constructed by using Efron＇s resampling technique, and the strong uniform convergence of the bootstrap approximation is proved. Our results can be used to construct the large sample confidence intervals for the parameters of interest. A simulation study is conducted to evaluate the finite-sample performance of the bootstrap method and to compare it with the normal approximation-based method.

关键词： bootstrap approximation confidence interval semiparametric regression model strong uniform convergence wavelet estimate

Chinese Medicine in Fighting against Covid-19: Role and Inspiration

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2021年第1期27卷 3-6页

作者： LI Jin-gen XU Hao Departm ent of Cardiology Dongzhimen HospitalBeijing University of Chinese MedicineBeijing100700China Cardiovascular Disease Center Xiyuan HospitalNational Clinical Research Center for Chinese Medicine CardiologyChina Academy of Chinese Medical SciencesBeijing100091China

Covid-19 pandemic has caused hundreds of thousands deaths and millions of infections and continued spreading *** researchers are racing to find or develop effective drugs or vaccines,no drugs from modern medical system have been proven effective and the high mutant rates of the virus may lead it resistant to whatever drugs or vaccines developed following modern drug development *** evidence has demonstrated impressive healing effects of several Chinese medicines(CMs)for Covid-19,which urges us to reflect on the role of CM in the era of modern ***,CM could be promising resources for developing drug candidates for the treatment of Covid-19 in a way similar to the development of *** the theory that builds CM,like the emphasis of driving away exogenous pathogen(virus,etc.)by restoring self-healing capacity rather than killing the pathogen directly from the inside and the'black-box'mode of diagnosing and treating patients,is as important,yet often ignored,an treasure as CM herbs and should be incorporated into modern medicine for future advancement and innovation of medical science.

关键词： Chinese medicine Covid-19 SARS-Co V-2 coronavirus herbal medicine

Hypermethylation of tumor suppressor and tumor-related genes in neoplastic and non-neoplastic gastric epithelia

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2009年第1期1卷 41-46页

作者： gen Tamura Department of Pathology and Laboratory Medicine Yamagata Prefectural Central Hospital

A number of tumor suppressor and tumor-related genes exhibit promoter hypermethylation with resultant gene silencing in human *** frequencies of methylation differ among genes and genomic regions within CpG islands in different tissue *** initially occurs at the edge of CpG islands and spreads to the transcription start site before ultimately shutting down gene *** the degree of methylation was quantitatively evaluated in neoplastic and non-neoplastic gastric epithelia using DNA microarray analysis,highlevel methylation around the transcription start site appeared to be a tumor-specific phenomenon,although multiple tumor suppressor genes became increasingly methylated with patient age in non-neoplastic gastric *** analysis of DNA methylation is a promising method for both cancer diagnosis and risk assessment.

关键词： Hypermethylation DNA microarray Tumor suppressor gene Gastric cancer

CPA-VoD： Cloud and Peer-Assisted Video on Demand System for Mobile Devices

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 Computer Science & Technology 2016年第6期31卷 1087-1095页

作者： Lei-gen Cheng Laizhong Cui Yong Jiang Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China College of Computer Science and Software Engineering Shenzhen University Shenzhen 518060 China

With the rapid development of WiFi and 3G/4G, people tend to view videos on mobile devices. These devices are ubiquitous but have small memory to cache videos. As a result, in contrast to traditional computers, these devices aggravate the network pressure of content providers. Previous studies use CDN to solve this problem. But its static leasing mechanism in which the rental space cannot be dynamically adjusted makes the operational cost soar and incompatible with the dynamically video delivery. In our study, based on a thorough analysis of user behavior from Tencent Video, a popular Chinese on-line video share platform, we identify two key user behaviors. Firstly, lots of users in the same region tend to watch the same video. Secondly, the popularity distribution of videos conforms with the Pareto principle, i.e., the top 20% popular videos own 80% of all video traffic. To turn these observations into silver bullet, we propose and implement a novel cloud- and peer-assisted video on demand system （CPA-VoD）. In the system, we group users in the same region as a peer swarm, and in the same peer swarm, users can provide videos to other users by sharing their cached videos. Besides, we cache the 10% most popular videos in cloud servers to further alleviate the network pressure. We choose cloud servers to cache videos because the rental space can be dynamically adjusted. According to the evaluation on a real dataset from Tencent Video, CPA-VoD alleviates the network pressure and the operation cost excellently, while only 20.9% traffic is serviced by the content provider.

关键词： cloud peer-to-peer (P2P) video on demand (VoD) mobile application

Different Configurations of Interannual Variability of the Western North Pacific Subtropical High and East Asian Westerly Jet in Summer

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

Advances in Atmospheric Sciences 2021年第6期38卷 931-942页

作者： Xinyu LI Riyu LU gen LI Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210098China College of Oceanography Hohai UniversityNanjing 210098China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of the Chinese Academy of SciencesBeijing 100049China

This study investigates the circulation and precipitation anomalies associated with different configurations of the western North Pacific subtropical high(WNPSH)and the East Asian westerly jet(EAJ)in summer on interannual *** in-phase configuration of the WNPSH and EAJ is characterized by the westward(eastward)extension of the WNPSH and the southward(northward)shift of the EAJ,which is consistent with the general correspondence between their *** out-of-phase configuration includes the residual *** find that the in-phase configuration manifests itself as a typical meridional *** instance,there is an anticyclonic(cyclonic)anomaly over the tropical western North Pacific and a cyclonic(anticyclonic)anomaly over the mid-latitudes of East Asia in the lower *** circulation anomalies are more conducive to rainfall anomalies over the Yangtze River basin and south Japan than are the individual WNPSH or *** contrast,for the out-of-phase configuration,the mid-latitude cyclonic(anticyclonic)anomaly is absent,and the lower-tropospheric circulation anomalies feature an anticyclonic(cyclonic)anomaly with a large meridional ***,significant rainfall anomalies move northward to North China and the northern Korean *** results indicate that the out-of-phase configuration is associated with the developing phase of ENSO,with strong and significant sea surface temperature(SST)anomalies in the tropical central and eastern Pacific which occur simultaneously during summer and persist into the following *** is sharply different from the in-phase configuration,for which the tropical SSTs are not a necessity.

关键词： western North Pacific subtropical high East Asian westerly jet circulation rainfall sea surface temperature

Magnetic properties and magnetocaloric effects of PrSi

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2014年第3期33卷 239-243页

作者： Li-Chen Wang Bao-gen Shen State Key Laboratory for Magnetism Institute of PhysicsChinese Academy of Sciences

Magnetic properties and magnetocaloric effects （MCEs） of the PrSi compound were studied. The PrSi compound undergoes a second-order ferromagnetic-to-paramagnetic transition at the Curie temperature of Tc = 52 K. Large MCE with no magnetic hysteresis loss is observed around Tc. The maximum values of magnetic entropy change （△S） are found to be -8.6 and -15.3 ***^-1.K^-1 for the magnetic field changes of 0-2 T and 0-5 T, respectively. The large △S with no hysteresis makes PrSi compound a competitive candidate for magnetic refrigerant.

关键词： PrSi Magnetic property Magnetocaloriceffect Magnetic entropy change

Brake Orbits of First Order Convex Hamiltonian Systems with Particular Anisotropic Growth

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2020年第2期36卷 171-178页

作者： Xiao Fei ZHANG Chun gen LIU School of Mathematics and Statistics Shanxi Datong UniversityDatong 037009P.R.China School of Mathematics and Information Science Guangzhou UniversityGuangzhou 510006P.R.China

Combining the dual least action principle with Mountain-pass lemma,we obtain the existence of brake orbits for first-order convex Hamiltonian systems with particular anisotropic growth.

关键词： Hamiltonian system brake orbit anisotropic grow th Mountain-pass lemma

An Alamouti coded CP-FBMC-MIMO system with two transmit antennas

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2015年第10期58卷 127-132页

作者： KONG DeJin XIA Xiang-gen JIANG Tao Wuhan National Laboratory for Optoelectronics School of Electronics Information and CommunicationsHuazhong University of Science and Technology Department of Electrical and Computer Engineering University of Delaware

In this paper, we propose an Alamouti coding for filter bank multicarrier(FBMC) with cyclic prefix(CP) for two transmit antennas, which can avoid the imaginary interference problem existing in the conventional FBMC with multi-antenna systems. Instead of performing Alamouti coding on original data symbols, we perform Alamouti coding on pre-processing signal at the transmitter in our proposed scheme. We show that our proposed scheme has fast single-symbol maximum-likelihood(ML) decoding and achieves full spatial diversity. Simulation results show that the proposed scheme can achieve the BER performance of Alamouti coding under both of the flat-fading channel and the frequency-selective channel. Therefore, it is an efficient Alamouti coding scheme for CP-FBMC systems with two transmit antennas.

关键词： filter bank multi carrier(FBMC) multi-input multi-output(MIMO) Alamouti code MIMOFBMC spatial diversity cyclic prefix(CP)