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A note about the cyclotomic polynomial Φ_(pq)(x) and some related results

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Applied Mathematics(A Journal of Chinese Universities) 2008年第2期23卷 245-250页

作者： zhu Feng-xiang qi Wen-feng Dept. of Appl. Math. Zhengzhou Inform. Eng. Univ. Zhengzhou 450002 China

. The expression of cyclotomic polynomial Фpq （x） is concerned for a long time. A simple and explicit expression of Фpq （x） in Z[x] has been showed. The form of the factors of Фpq （x） over F2 and the upper, l... 详细信息

关键词： cyclotomic polynomial Фpq(x) coefficient factor.

Kinetic Monte Carlo simulation of physical vapor deposition of thin Cu film

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中国有色金属学会会刊：英文版 2004年第Z1期14卷 463-467页

作者： WANG Jun CHEN Chang-qi zhu Wu School of Mechanical and Automobile Hefei University of Technology Hefei 230009 China School of Mechanical and Automobile Hefei University of Technology Hefei 230009 China School of Mechanical and Automobile Hefei University of Technology Hefei 230009 China

A two-dimensional Kinetic Monte Carlo method has been developed for simulating the physical vapor deposition of thin Cu films on Cu substrate. An improved embedded atom method was used to calculate the interatomic potential and determine the diffusion barrier energy and residence time. Parameters, including incident angle,deposition rate and substrate temperature, were investigated and discussed in order to find their influences on the thin film morphology.

关键词： physical vapor deposition Kinetic Monte Carlo method embedded atom method thin film growth simulation morphology

Coverage Probability and Average Rate of Uplink Cellular Networks Based on a 3-D Model

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Chinese Journal of Electronics 2018年第5期27卷 1098-1103页

作者： PAN Ziyu zhu qi LIANG Guangjun HU Han The Key Wireless Lab of Jiangsu Province School of Telecommunication and Information EngineeringNanjing University of Posts and Telecommunications School of Communications Engineering Nanjing Institute of Technology

Uplink cellular networks are usually modeled using simple Wyner-type cellular models where interference is simplified as a single random variable, or via 2-D Poisson point process(PPP) theory, with mobile users either scattered randomly or placed deterministically. These models are insufficient to evaluate performance in dense urban environments where a large number of small cells are installed. We take a fresh look at this problem using tools from 3-D PPP, and we develop a new general model based on 3-D space for uplink cellular networks. The main idea is modeling mobile users and small cells as two separate spatial PPPs. Under general assumptions, the uplink coverage probability can be easily evaluated through fast integral calculation. We compare our model to the traditional 2-D model and actual mobile user/small cell deployment, and we observe that the proposed model is more accurate and provides a closer bound of coverage probability.

关键词： Uplink cellular networks Coverage probability Poisson point process 3-D space

Analysis of connectivity in Ad-hoc network based on interference and fading channel

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The Journal of China Universities of Posts and Telecommunications 2012年第5期19卷 77-82页

作者： XU Bin-tai zhu qi HU Han Jiangsu Key Lab of Wireless Communications Key Lab on Wideband Wireless Communications and Sensor Network Technology of Ministry of Education

In Ad-hoc wireless network, connectivity is a fundamental issue which restricts the design of system protocol. Based on the theory of stochastic geometry, a connectivity model focused on signal-to-interference （SIR） ratio is set up in presence of Nakagami-m fading and interference. This paper derives a close formula of connectivity probability with interference and Nakagami-m fading which is never obtained in previous works. Two-dimension shot-noise theory in stochastic geometry for interference is well applied. The formula is verified by simulation. The results show that the connectivity is affected by the scatter of users, wireless propagation environment, interference and so on.

关键词： Ad-hoc wireless network connectivity the probability of isolated node interference Nakagami-m fading

基于联合偏度的高光谱图像波段选择对玉米种子分类研究(英文)

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光谱学与光谱分析 2017年第3期37卷 990-996页

作者：杨赛朱启兵黄敏江南大学轻工过程先进控制教育部重点实验室江苏无锡214122

高光谱图像技术是在种子识别领域广泛应用的农产品品质无损检测方法。特征信息的充分提取和最优波段的选择是影响高光谱图像技术种子鉴选在线应用的关键因素。目的在于利用联合偏度算法选择高光谱图像的最优波段,用于开发在线的种子分... 详细信息

高光谱图像技术是在种子识别领域广泛应用的农产品品质无损检测方法。特征信息的充分提取和最优波段的选择是影响高光谱图像技术种子鉴选在线应用的关键因素。目的在于利用联合偏度算法选择高光谱图像的最优波段,用于开发在线的种子分级系统。论文利用高光谱图像采集系统获取10类共960粒玉米种子在438~1 000 nm(共219个波段)波段范围内的高光谱图像,并提取了种子高光谱图像的平均光谱、图像熵特征。利用联合偏度算法选择了高光谱图像的最优波段,分别建立了基于平均光谱、图像熵、平均光谱和图像熵联合特征条件下的支持向量机种子分类模型,比较不同特征下分类模型的识别精度。实验结果表明:无论是全波段分类模型,还是建立在最优波段基础上的分类模型,利用平均光谱和图像熵联合特征获得的分类精度均高于平均光谱和图像熵两种单一特征模型。在10个最优波段条件下,联合特征分类模型的识别精度达到了96.28%,比光谱均值和图像熵的识别精度分别提高了4.30%和20.38%,也高于全波段联合特征识别模型的93.47%。利用联合特征建立玉米种子分类模型时,基于联合偏度的波段选择算法的分类精度要高于无信息变量消除法、连续投影算法和竞争性自适应重加权算法。该研究为种子高光谱图像识别技术的在线运用提供了可行的途径。

关键词：玉米种子高光谱图像波段选择联合偏度支持向量机

Combination therapy for scalp angiosarcoma using bevacizumab and chemotherapy: a case report and review of literature

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Chinese Journal of Cancer Research 2013年第3期25卷 358-361页

作者： Ping Yang qi zhu Fuqiang Jiang Department of Oncology PLA Navy General Hospital

Bevacizumab, an angiogenesis inhibitor, is a recombined humanized monoclonal antibody against vascular endothelial growth factor and a promising therapeutic option for angiosarcoma management. This is a ease report and review of the literature using bevacizumab and combination chemotherapy for angiosarcoma. The understanding of the effectiveness of combined therapy of bevacizumab and chemotherapy agents is still limited. The benefits of bevacizumab treatment for angiosarcoma will need to be weighed against the risks of venous thromboembolism in this population.

关键词： Angiosarcoma chemotherapy bevacizumab angiogenesis inhibitor combination therapy

Recent progress in layered rare-earth hydroxide (LRH) and its application in luminescence

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Journal of Advanced Ceramics 2017年第3期6卷 177-186页

作者： qi zhu Xuejiao WANG Ji-Guang LI Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) Northeastern University Shenyang 110819 ChinaInstitute of Ceramics and Powder Metallurgy School of Materials Science and Engineering Northeastern University Shenyang 110819 China Research Center for Functional Materials National Institute for Materials Science Namiki 1-1 Tsukuba Ibaraki 305-0044 JapanCollege of New Energy Bohai University Jinzhou 121000 China Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) Northeastern University Shenyang 110819 ChinaInstitute of Ceramics and Powder Metallurgy School of Materials Science and Engineering Northeastern University Shenyang 110819 ChinaResearch Center for Functional Materials National Institute for Materials Science Namiki 1-1 Tsukuba Ibaraki 305-0044 Japan

This review article compiles the recent achievements made in layered rare-earth (RE) hydroxide (LRH), including controlled crystallization, structural and morphological features, anion exchange, nanosheet exfoliation, and application in the field of luminescence for both the Ln2(OH)5(Ax-)1/x·nH2O (251-LRH) and Ln2(OH)4(Ax-)2/x·nH2O (241-LRH) phases. The luminescent properties of the LRHs themselves, the oxide, oxysulfate, and oxysulfide phosphors derived from the LRHs via controlled calcination, and the highly oriented transparent phosphor films of enhanced luminescence and/or novel emission features are summarized.

关键词： layered rare-earth hydroxide (LRH) anion exchange exfoliation assembly luminescence

基于大数据的技术性贸易措施情报预警模式探究

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标准科学 2024年第6期 46-52页

作者：王淼唐妍琪王若雅朱思婍中国标准化研究院商务部国际贸易经济合作研究院

大数据时代,海量的数据资源迫使人们以大数据思维看待世界和解决问题,各个领域都开启了量化进程。由于情报预警在情报分析的目的、面临的环境、数据的来源类型以及产出形式等方面有其独特性,利用大数据技术对其进行分析会更加具有针对... 详细信息

大数据时代,海量的数据资源迫使人们以大数据思维看待世界和解决问题,各个领域都开启了量化进程。由于情报预警在情报分析的目的、面临的环境、数据的来源类型以及产出形式等方面有其独特性,利用大数据技术对其进行分析会更加具有针对性。本文首先对当前国内技术性贸易措施情报预警模式的现状进行了汇总分析,接着构建了基于大数据的新型技术性贸易措施情报预警技术,并在此基础上进一步提出了针对该模式配套工作的具体建议。文章旨在为我国在贸易领域的情报应急决策提供有力支持,为我国的贸易发展贡献智慧与力量。

关键词：技术性贸易措施情报预警模式大数据

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Compressed wide spectrum sensing scheme based on BP network

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The Journal of China Universities of Posts and Telecommunications 2012年第3期19卷 7-16页

作者： WANG Lu-yu zhu qi ZHAO Su Key Laboratory on Wideband Wireless Communications and Sensor Network Technology Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China

This paper proposes a compressed sensing （CS） scheme to reconstruct and estimate the signals. In this scheme, the framework of CS is used to break the Nyquist sampling limit, making it possible to reconstruct and estimate signals via fewer measurements than that is required traditionally. However, the reconstruction algorithms based on CS are normally non-deterministic polynomial hard （NP-hard） in mathematics, which makes difficulties in obtaining real-time analysis-results. Therefore, a new compressed sensing scheme based on back propagation （BP） neural network is proposed under an assumption that every sub-band is the same. In this new scheme, BP neural network is added into detection process, replacing for signal reconstruction and decision-making. By doing this, heavy calculation cost in reconstruction is moved into pre-training period, which can be done before the real-time analysis, bringing about a sharp reduction in time consuming. For simplify, 1-bit quantification is taken on compressed signals. Simulations demonstrate the performance enhancement in the proposed scheme： compared with normal CS-based scheme, the proposed one presents a much shorter response time as well as a better robustness performance to noise via fewer measurements.

关键词： spectrum sensing compressed sensing BP neural network