检索结果-南通市图书馆

Cellular & Molecular Immunology 2010年第2期7卷 157-162页

作者： Shudao xiong Lei zhang Yiwei Chu Department of Immunology Shanghai Medical College Institute for Immunobiology Key Laboratory of Molecular Medicine of Ministry of Education Fudan University ShanghaiChina

Low-dose total body irradiation （LTBI） is used in the treatment of some cancers mainly for immune enhancement rather than cell killing. However, the mechanism underlying LTBI remains unknown. In this study, by analyzing the immune patterns of lymphocytes, we found that the percentage and absolute number of CD4^＋CD25^＋Foxp3^＋ regulatory T cells are markedly decreased in naive mice following treatment with LTBI. On the contrary, the CD4^＋CD44^＋/CD8^＋CD44^＋ effector-memory T cells are greatly increased. Importantly, naive mice treated with dendritic cell-gp100 tumor vaccines under LTBI induced an enhancement of antigen-specific proliferation and cytotoxicity as well as interferon-γ, （IFN-γ） secretion against FIO melanoma tumor challenge, compared to treatment with either the tumor vaccine or LTBI alone. Consequently, the treatment resulted in a reduced tumor burden and prolonged mouse survival. Our data demonstrate that LTBI＇s enhancement of antitumor immunity was mainly associated with selectively decreasing the proportion and number of T regulatory cells, implying the potential application of the combination of LTBI and a tumor vaccine in antitumor therapy.

关键词： CD4^+CD25^+Foxp3^+ T cells CD4^+CD44^+/CD8^+CD44^+ effector-memory T cells low-dose total body irradiation LTBI tumor vaccine

Fuzzy Stability of Quadratic-cubic Functional Equations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2011年第11期27卷 2191-2204页

作者： Zhi Hua WANG Wan xiong zhang Department of Mathematics Sichuan University Chengdu 610064 P. R. China School of Science Hubei University of Technology Wuhan 430068 P. R. China College of Mathematics and Statistics Chongqing University Chongqing 401331 P. R. China

In this paper, the direct method and the fixed point alternative method are implemented to give Hyers-Uiam-Rassias stability of the functional equation 6f（x＋y）-6f（x-y）＋4f（3y）=3f（x＋2y）-3f（x-2y）＋9f（2y） in fuzzy Banach spaces. We can find the range of approximate solutions obtained using the direct method are less than those obtained by using the fixed point alternative method for the above and the functional equation.

关键词： Fuzzy normed space quadratic-cubic functional equation fixed point alternative method Hyers-Ulam-Rassias stability

基于波束形成及CNN-LSTM的托辊故障距离估计模型

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

噪声与振动控制 2024年第5期44卷 114-119页

作者：张雄武文博李嘉禄董帆万书亭华北电力大学河北省电力机械装备健康维护与失效预防重点实验室河北保定071003 华北电力大学机械工程系河北保定071003

托辊是带式输送机的关键组件,也是输送系统的薄弱环节,波束形成算法的定向性和深度学习算法的特征识别能力为托辊故障距离估计提供可能。针对输送机输送距离长、不易检测等问题,提出一种利用波束形成(Beamforming)及时空网络(Convolutio... 详细信息

托辊是带式输送机的关键组件,也是输送系统的薄弱环节,波束形成算法的定向性和深度学习算法的特征识别能力为托辊故障距离估计提供可能。针对输送机输送距离长、不易检测等问题,提出一种利用波束形成(Beamforming)及时空网络(Convolutional Neural Network-Long Short-Term Memory,CNN-LSTM)对托辊故障声源实现距离估计的方法(Beamforming-Convolutional neural network-Long short-term memory,BCL)。首先利用麦克风阵列采集不同距离的故障声源数据,经波束形成定位处理构建数据集;通过卷积神经网络(CNN)获得数据采样集的空间特性,再借助LSTM网络在序列上的建模功能,将由空间数据组成的序列信息输入LSTM网络,从而获得空间时序信息;最后,再将由LSTM网络产生的空间时序信息输入到Softmax分类器,实现故障距离估计。实验结果表明,BCL模型在有无噪声干扰的环境下都可以以高准确率实现托辊的故障距离估计且较其他模型拥有更好的识别能力。

关键词：故障诊断托辊波束形成 BCL 距离估计

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于量子行走的彩色多图像加密

中国计量大学学报 2024年第1期35卷 129-136,151页

作者：刘升张雄赵春柳中国计量大学光学与电子科技学院浙江杭州310018

目的:为了探索量子行走在图像加密中的性能。方法:提出了一种基于量子行走和回转器变换的彩色多图像加密方案。设计基于量子行走的图像加密对应的具体算法流程。通过仿真实验对方案进行有效性分析,并对相关性、直方图、噪声和数据丢失... 详细信息

目的:为了探索量子行走在图像加密中的性能。方法:提出了一种基于量子行走和回转器变换的彩色多图像加密方案。设计基于量子行走的图像加密对应的具体算法流程。通过仿真实验对方案进行有效性分析,并对相关性、直方图、噪声和数据丢失、信息熵以及密钥安全性进行了分析研究。结果:基于量子行走的图像加密方案能够有效进行图像加密,并具有良好的抗噪声性能和安全性。结论:量子行走技术在图像加密方面具有良好的应用能力。

关键词：量子行走图像加密回转器变换

Overview of 6π 1,5-Electrocyclization over the Past 40 Years

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第6期41卷 725-740页

作者： Zhiqiang Huang Wei Liu Wen-xiong zhang Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory of Rare Earth Materials Chemistryand Applications&Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of EducationCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

As an important part of pericyclic reaction,6π 1,5-electrocyclization plays an important role in organic synthesis and chemical *** types of five-membered rings could be constructed via 1,5-electrocyclization with high atom *** elegant works have been reported in this field in the past few ***,it still needs a lot of effort in further advancements of 1,5-electrocyclization.

关键词： Electrocyclization Five-membered Rings Heterocyclic Compounds Pericyclic Reaction

Credit Determination of Fibre Channel in Avionics Environment

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 Aeronautics 2007年第3期20卷 247-252页

作者： LIN Qiang xiong Hua-gang zhang Qi-shan School of Electronic and Information Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

Fibre channel （FC） is the main candidate architecture for ＂unified network＂. Flow control deals with the problem in which a device receives frames faster than it can process them. Credit is an important service parameter for fibre channel flow control. Configuring the credit reasonably can avoid buffer overflow in nodes. This paper derives the mathematic relationships among credit, bandwidth and message sets under real-time condition according as three main topologies of fibre channel, and proposes the credit determination and the optimal credit for typical message sets. This study is based on the features of hard real-time communications in avionics environment.

关键词： fibre channel topology login credit hard real-time condition

A precise approach to tracking dim-small targets using spectral fingerprint features

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2012年第5期6卷 527-536页

作者： Hao SHENG Chao LI Yuanxin OUYANG zhang xiong School of Computer Science and Engineering Beihang UniversityBeijing 100191China Research Institute of Beihang University in Shenzhen Shenzhen 518057China State Key Laboratory of Software Development Environment Beihang UniversityBeijing 100191China

A precise method for accurately tracking dim- small targets, based on spectral fingerprint is proposed where traditional full color tracking seems impossible. A fingerprint model is presented to adequately extract spectral features. By creating a multidimensional feature space and extending the limited RGB information to the hyperspectral information, the improved precise tracking model based on a nonparamet- ric kernel density estimator is built using the probability his- togram of spectral features. A layered particle filter algorithm for spectral tracking is presented to avoid the object jumping abruptly. Finally, experiments are conducted that show that the tracking algorithm with spectral fingerprint features is ac- curate, fast, and robust. It meets the needs of dim-small target tracking adequately.

关键词： dim-small target precise tracking spectral fingerprint features LPF algorithm for spectral tracking

A hierarchical similarity based job recommendation service framework for university students

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2017年第5期11卷 912-922页

作者： Rui LIU Wenge RONG Yuanxin OUYANG zhang xiong State Key Laboratory of Software Development Environment Beihang University Beijing 100191 China Engineering Research Center of Advanced Computer Application Technology Ministry of Education Beihang University Beijing 100191 China School of Computer Science and Engineering Beihang University Beijing 100191 China

When people want to move to a new job, it is often difficult since there is too much job information available. To select an appropriate job and then submit a resume is tedious. It is particularly difficult for university students since they normally do not have any work experience and also are unfamiliar with the job market. To deal with the informa- tion overload for students during their transition into work, a job recommendation system can be very valuable. In this research, after fully investigating the pros and cons of current job recommendation systems for university students, we propose a student profiling based re-ranking framework. In this system, the students are recommended a list of potential jobs based on those who have graduated and obtained job offers over the past few years. Furthermore, recommended employers are also used as input for job recommendation result re-ranking. Our experimental study on real recruitment data over the past four years has shown this method＇s potential.

关键词： job recommendation students similarity time,re-ranking

The Internet of data： a new idea to extend the IOT in the digital world

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2012年第6期6卷 660-667页

作者： Wei FAN Zhengyong CHEN zhang xiong Hui CHEN State Key Laboratory of Software Development Environment Beihang UniversityBeijing 100191China Research Institute of Beihang University in Shengzhen Shenzhen 518057China Sino-French Engineering School Beihang UniversityBeijing 100191China

Increasingly powerful computational technology has caused enormous data growth both in size and complexity. A key issue is how to organize the data to adapt the challenges of data analysis. This paper borrows ideas from the Internet of things （IOT） into the digital world and organize the data entities to form a network, the Internet of data （IOD）, which has huge potential in data-intensive applications. In the IOD, data hiding technology is utilized to embed virtual tags, which record all the activities of the data entities since they are created, into every data entity in the system. The IOD aims to organize the data to be interconnected as a network and collect useful information for data identification, data tracing, data vitalization and further data analysis.

关键词： Internet of data (IOD) virtual tags Internet of things (lOT) data-intensive applications data vitalization data hiding

Effect of Polyaniline/manganese Dioxide Composite on the Thermoelectric Effect of Cement-based Materials

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 Wuhan University of Technology(Materials Science) 2023年第1期38卷 109-116页

作者：季涛 LIAO Xiao HE Yan 张士萍 zhang Xiaoying zhang xiong LI Weihua School of Architecture and Civil Engineering Nanjing Institute of TechnologyNanjing 211167China College of Civil Engineering Qingdao University of TechnologyQingdao 266033China School of Civil Engineering Suzhou University of Science and TechnologySuzhou 215011China School of Materials Science and Engineering Tongji UniversityShanghai 201804China School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

To enhance the thermoelectric effect of cement-based materials,conductive polyaniline(PANI)modified MnO_(2)powder was synthesized and used as a thermoelectric component in the cement *** nanostructured PANI was deposited on the surface of the nanorod-shapedα-MnO_(2)particle and the weight ratio of PANI to MnO_(2)was 22.3:77.7 in the *** synthesized PANI/MnO_(2)composite was nanostructured according to the SEM *** test results of the thermoelectric properties proved that the PANI/MnO_(2)composite was effective as the Seebeck coefficient and electrical conductivity values of the cement composites with PANI/MnO_(2)inside were 3-4 orders of magnitude higher than those of pure cement paste and the thermal conductivity values of these cement samples were *** obtained maximum figure of merit(ZT)value(2.75×10^(-3))was much larger than that of conductive materials reinforced cement-based *** thermoelectric effect of cement composites is mainly enhanced by the increased Seebeck coefficient and electrical conductivity in this work.

关键词： PANI/MnO_(2)composite cement composites thermoelectric effect Seebeck coefficient electrical conductivity