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SPR光谱信号的无基线质心法 被引量:2
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作者 王晓萍 董联红 詹舒越 《传感技术学报》 CAS CSCD 北大核心 2012年第3期365-369,共5页
为提高角度调制型表面等离子体共振(SPR)传感器的信噪比、分辨率等指标,并减少运算量,在分析固定基线质心法、基于幅值的动态基线质心法的基础上,提出一种确定SPR共振角的无基线质心法。运用SpreetaTM传感器和自行研制的SPR检测仪器,开... 为提高角度调制型表面等离子体共振(SPR)传感器的信噪比、分辨率等指标,并减少运算量,在分析固定基线质心法、基于幅值的动态基线质心法的基础上,提出一种确定SPR共振角的无基线质心法。运用SpreetaTM传感器和自行研制的SPR检测仪器,开展多种质量浓度的氯化钠和蔗糖溶液实验,获得SPR光谱数据,并分别采用上述三种质心法进行SPR共振像素计算,得到SPR监控曲线;分析比较三种质心法的运算速度、光源波动敏感度、信噪比和分辨率等指标。结果表明无基线质心法具有运算速度快、不受光源波动影响、信噪比高、分辨率高等特点,能有效提高SPR传感器和检测系统的性能。 展开更多
关键词 SPR传感器 无基线质心法 噪声分析 数据处理
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基于概率的Lamb波无基线损伤识别方法
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作者 李冬生 金盟道 《福建建设科技》 2016年第6期29-31,34,共4页
本文提出了一种基于概率的Lamb波无基线损伤识别方法,该方法采用分布式的主动传感网络与时间窗函数进行损伤信号的提取,再利用连续小波变换计算损伤信号时间特征,最后根据双曲线概率成像算法对结构进行损伤定位成像。分别采用数值模拟... 本文提出了一种基于概率的Lamb波无基线损伤识别方法,该方法采用分布式的主动传感网络与时间窗函数进行损伤信号的提取,再利用连续小波变换计算损伤信号时间特征,最后根据双曲线概率成像算法对结构进行损伤定位成像。分别采用数值模拟和实验研究对该算法进行了验证,结果证明所提出的方法能够有效地识别损伤。 展开更多
关键词 LAMB波 无基线 概率 定位成像
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基于波束成型的Lamb波无基线损伤识别技术研究
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作者 李冬生 金盟道 《预应力技术》 2016年第4期28-32,共5页
本文提出了一种基于波束成型的Lamb波无基线损伤识别方法,该方法利用激励-回波模式的分布式传感网络与时间窗函数进行损伤信号的提取,然后利用波束成型算法对结构进行损伤定位与成像。分别采用数值模拟和实验对该方法进行验证,结果证明... 本文提出了一种基于波束成型的Lamb波无基线损伤识别方法,该方法利用激励-回波模式的分布式传感网络与时间窗函数进行损伤信号的提取,然后利用波束成型算法对结构进行损伤定位与成像。分别采用数值模拟和实验对该方法进行验证,结果证明所提出的方法能够有效地识别损伤。 展开更多
关键词 LAMB波 无基线 波束成型 定位成像
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无基线点状雨夜反光标线的设计 被引量:1
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作者 刘伟昆 《山西交通科技》 2011年第4期78-79,共2页
点状雨夜标线,是基于振荡标线提出的一种路面标线的新理念。通过对标线外观的设计确定去掉原来的振动标线的底基线,仅仅保留凸起部分,凸起部分直径为15 mm,高度大于3 mm,面积占拟标线面积的60%,该标线降低了材料消耗,同时解决标线阻水... 点状雨夜标线,是基于振荡标线提出的一种路面标线的新理念。通过对标线外观的设计确定去掉原来的振动标线的底基线,仅仅保留凸起部分,凸起部分直径为15 mm,高度大于3 mm,面积占拟标线面积的60%,该标线降低了材料消耗,同时解决标线阻水问题。 展开更多
关键词 无基线 点状 雨夜 标线 设计
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示波器几例故障的排除
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作者 卢涛 《家电科技(维修与培训)》 2003年第9期57-57,共1页
关键词 示波器 故障 排除方法 无基线 无亮点 同步 光迹线
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COMPARISON AND EVALUATION OF CURRENT REFERENCE GENERATION STRATEGIES FOR ACTIVE POWER FILTERS IN THREE-PHASE FOUR-WIRE SYSTEMS
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作者 陈东华 郭涛 +1 位作者 谢少军 周波 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2005年第4期298-306,共9页
For three phase four-wire active power filters (APFs), several typical power theories and corresponding current reference generation strategies are induced, p-q, d-q, unify power factor (UPF) and instantaneous act... For three phase four-wire active power filters (APFs), several typical power theories and corresponding current reference generation strategies are induced, p-q, d-q, unify power factor (UPF) and instantaneous active current (IAC) methods are analyzed and compared with each other. The interpretation of active and reactive currents in non-sinusoidal and unbalanced three-phase four-wire systems is given based on the generalized instantaneous reactive power theory. The performance and the characteristic are evaluated, and the application conditions of current reference generation strategies are concluded. Simulation results under different source voltages and loads verify the evaluation result. 展开更多
关键词 active power filters instantaneous reactive power current reference three-phase four wire power
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Short Review:Mitochondrion and its related disorders:Making a comeback 被引量:3
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作者 Xian-ning ZHANG Ming QI 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2008年第2期90-92,共3页
The great majority of genetic disorders are caused by defects in the nuclear genome. However, some significant diseases are the result of mitochondrial mutations. Because of the unique features of the mitochondria, th... The great majority of genetic disorders are caused by defects in the nuclear genome. However, some significant diseases are the result of mitochondrial mutations. Because of the unique features of the mitochondria, these diseases display characteristic modes of inheritance and a large degree of phenotypic variability. Recent studies have suggested that mitochondrial dysfunction plays a central role in a wide range of age-related disorders and various forms of cancer. 展开更多
关键词 MITOCHONDRIA Mitochondrial disorder MUTATION
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Incorporating Network Coding into TCP Grounded on Network Utility Maximization in Multi-Radio Multi-Channel Wireless Mesh Networks 被引量:1
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作者 Liu Hongquan Gu Yuantao 《China Communications》 SCIE CSCD 2012年第6期28-35,共8页
A new approach, named TCP-I2NC, is proposed to improve the interaction between network coding and TCP and to maximize the network utility in interference-free multi-radio multi-channel wireless mesh networks. It is gr... A new approach, named TCP-I2NC, is proposed to improve the interaction between network coding and TCP and to maximize the network utility in interference-free multi-radio multi-channel wireless mesh networks. It is grounded on a Network Utility Maxmization (NUM) formulation which can be decomposed into a rate control problem and a packet scheduling problem. The solutions to these two problems perform resource allocation among different flows. Simulations demonstrate that TCP-I2NC results in a significant throughput gain and a small delay jitter. Network resource is fairly allocated via the solution to the NUM problem and the whole system also runs stably. Moreover, TCP-I2NC is compatible with traditional TCP variants. 展开更多
关键词 network utility maximization net-work coding wireless mesh network TCP
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The first complete mitogenome of Cyclommatus stag beetles(Coleoptera: Lucanidae) with the phylogenetic implications
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作者 刘静 李成功 +1 位作者 游硕 万霞 《Entomotaxonomia》 CSCD 2017年第4期294-299,共6页
The first complete mitogenome of Cyclommatus stag beetles, Cyclommatus vitalisi(Coleoptera: Lucanidae) is sequenced using the next generation sequening. The genomic structure is a closed circular molecule with 17,8... The first complete mitogenome of Cyclommatus stag beetles, Cyclommatus vitalisi(Coleoptera: Lucanidae) is sequenced using the next generation sequening. The genomic structure is a closed circular molecule with 17,853 bp in length, comprising 13 protein-coding genes, 22 transfer RNA genes(t RNAs), 2 ribosomal RNAs(r RNAs) and a control region. The sequence has neither a gene rearrangement nor a non-coding region. The nucleotide composition is A(36. 31%), C(21. 48%), T(31. 20%) and G(11. 01%), with overall AT content of 73. 61%. The phylogenetic analysis of 13 stag beetles and another three scarab beetles show that Cyclommatus vitalisi shares a close ancestry with Lucanus mazama and Lucanus fortunei. 展开更多
关键词 Cyclommatus vitalisi MITOGENOME phylogenomic analysis
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Constructing of wireless emergency communication system for underground coal mine based on WMN technology 被引量:7
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作者 YANG Wei ZHANG Yu LIU Yang 《Journal of Coal Science & Engineering(China)》 2010年第4期441-448,共8页
Based on the Wireless Mesh Network (WMN), a wireless emergency communicationsystem for underground coal mine which was designed to be capable of videosurveillance, voice communication, and environment monitoring at th... Based on the Wireless Mesh Network (WMN), a wireless emergency communicationsystem for underground coal mine which was designed to be capable of videosurveillance, voice communication, and environment monitoring at the same time wasproposed.The network architecture of the system was proposed, and its service model,extensible technology, medium access control, routing algorithm, channel allocation andsystem management technologies were analyzed according to the actual rescue requirementsof underground coal mine and the characteristics of underground spatial structureand radio transmissions.The relevant theories and key technologies were extracted,which would provide theoretical support for the system development. 展开更多
关键词 coal mine Wireless Mesh Network (WMN) emergency rescue communication ser- vice model
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Cluster-Based Content Download and Forwarding Scheme for Highway VANETs 被引量:3
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作者 mingsi zhang changle li +1 位作者 tao guo yuchuan fu 《China Communications》 SCIE CSCD 2018年第4期110-120,共11页
The recent advances in wireless communication technology enable high-speed vehicles to download data from roadside units(RSUs). However, the data download volume of individual vehicle is rather restricted due to high ... The recent advances in wireless communication technology enable high-speed vehicles to download data from roadside units(RSUs). However, the data download volume of individual vehicle is rather restricted due to high mobility and limited transmission range of vehicles, bringing users poor performance. To address this issue, we exploit the combination of both clustering and carry-and-forward schemes in this paper. Our scheme coordinates the cooperation of multiple infrastructures, cluster formation in the same direction and data forwarding of reverse vehicles to facilitate the target vehicle to download large-size content in dark areas. The process of data dissemination and achievable data download volume are then derived and analyzed theoretically. Finally, we conduct extensive simulations to verify the performance of the proposed scheme. Results show significant benefits of the proposed scheme in terms of increasing data download volume and throughput. 展开更多
关键词 clustering carry-and-forward^data dissemination data download volume
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A 5G Virtualized RAN Based on NO Stack 被引量:2
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作者 Jie Zeng Xin Su +2 位作者 Jinjin Gong Liping Rong Jing Wang 《China Communications》 SCIE CSCD 2017年第6期199-208,共10页
The virtualized radio access network(v RAN) could implement virtualized baseband functions on general-purpose platforms and expand the processing capacity of the radio access network(RAN) significantly.In this paper,a... The virtualized radio access network(v RAN) could implement virtualized baseband functions on general-purpose platforms and expand the processing capacity of the radio access network(RAN) significantly.In this paper,a Not Only Stack(NO Stack) based vR AN is proposed to be employed in the fifth generation(5G) mobile communication system.It adopts advanced virtualization technologies to maintain flexible and sustainable.The baseband processing and storage resources should be sliced and orchestrated agilely to support multi radio access technology(multiRAT) .Also it is analyzed and demonstrated by different use cases to validate the benefits.The proposed v RAN reduces signaling overheads and service response time in the bearer establishment procedure.Concluded from the analyses and demonstrations,the NO Stack based v RAN could support multi-RAT convergence and flexible networking effectively. 展开更多
关键词 NO Stack virtualized radio access network radio access network slice network virtualization
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An ISS-OFDM based adaptive filtering mechanism for interference suppression in wireless multi-hop communication network
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作者 秦丹阳 Ma Lin +1 位作者 Xu Renheng Ding Qun 《High Technology Letters》 EI CAS 2014年第3期230-236,共7页
The negative impact on communication performance in wireless multi-hop communication net-work caused by limited bandwidth,high bit eror rate (BER),fading,noise and interference is alleviated by an adaptive filtering... The negative impact on communication performance in wireless multi-hop communication net-work caused by limited bandwidth,high bit eror rate (BER),fading,noise and interference is alleviated by an adaptive filtering game based on frequency subbands selection and predetemined threshold.Such threshold is being obtained in Gaussian and multipath fading channel according to the frequency-matching principle and BER performance.The dynamic selection of subbands will obtain high use efficiency without the help of frequency hopping,and propound a new thought to improve band limited communication for wireless multi-hop communication network.The effectiveness of the adaptive filtering method has been verified by interleaving spread spectrum orthogonal frequency division multiplexing (ISS-OFDM) in different interference conditions,and the simulating results based on network simulator 2 (NS2) indicate that system BER can be improved greatly. 展开更多
关键词 multi-hop communication adaptive filtering interleaving spread spectrum orthogonal frequency division multiplexing (ISS-OFDM) interference suppression
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A Hybrid Handover Forecasting Mechanism Based on Fuzzy Forecasting Model in Cellular Networks 被引量:1
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作者 Hua Qu Yanpeng Zhang +2 位作者 Jihong Zhao Gongye Ren Weipeng Wang 《China Communications》 SCIE CSCD 2018年第6期84-97,共14页
As the increasing demand for mobile communications and the shrinking of the coverage of cells, handover mechanism will play an important role in future wireless networks to provide users with seamless mobile communica... As the increasing demand for mobile communications and the shrinking of the coverage of cells, handover mechanism will play an important role in future wireless networks to provide users with seamless mobile communication services. In order to guarantee the user experience, the handover decision should be made timely and reasonably. To achieve this goal, this paper presents a hybrid handover forecasting mechanism, which contains long-term and short-term forecasting models. The proposed mechanism could cooperate with the standard mechanisms, and improve the performance of standard handover decision mechanisms. Since most of the parameters involved are imprecise, fuzzy forecasting model is applied for dealing with predictions of them. The numerical results indicate that the mechanism could significantly decrease the rate of ping-pong handover and the rate of handover failure. 展开更多
关键词 handover forecasting mechanism fuzzy forecasting model long-term forecasting model short-term forecasting model
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A parallel algorithm for statistical-fairness-based spectrum allocation of cognitive radios
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作者 许恒锦 《High Technology Letters》 EI CAS 2009年第4期343-348,共6页
A parallel algorithm for statistical-fairness-based spectrum allocation of cognitive radios is proposedin this paper. The key idea of the algorithm is to pursue the maximum total spectrum utilization of thesystem by a... A parallel algorithm for statistical-fairness-based spectrum allocation of cognitive radios is proposedin this paper. The key idea of the algorithm is to pursue the maximum total spectrum utilization of thesystem by adopting a parallel technique in every spectrum allocation, and to ensure the statistical fairnessrule by deploying a particular scheme during a series of allocations. The simulation results show that theproposed algorithm not only achieves a fairer and more efficient allocation of spectrum resources, but alsohas much shorter allocation duration than the color sensitive graph coloring (CSGC) algorithm. 展开更多
关键词 cognitive radio (CR) dynamic spectrum allocation graph-coloring parallel algovrithm statistical fairness
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基于无线传感器网络定位技术的图书馆智能管理创新 被引量:3
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作者 罗桦 陈勇 +2 位作者 张清 赵滟 黄猛 《大学图书情报学刊》 2016年第2期50-52,57,共4页
"互联网+"时代,信息技术的发展对图书馆的智能化管理工作提出了更高的要求。文章概述了无线传感器网络与定位技术,重点讨论了如何将WSN定位技术运用到图书智能管理,通过定位技术与大数据、云计算等信息技术的结合,推动图书馆... "互联网+"时代,信息技术的发展对图书馆的智能化管理工作提出了更高的要求。文章概述了无线传感器网络与定位技术,重点讨论了如何将WSN定位技术运用到图书智能管理,通过定位技术与大数据、云计算等信息技术的结合,推动图书馆智能系统建设和智能化发展。 展开更多
关键词 图书馆 智能管理 无线传感器网络 定位技术 互联网+
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SPECTRUM SHARING IN ITERATED PRISONER'S DILEMMA GAME BASED ON EVOLUTIONARY STRATEGIES FOR COGNITIVE RADIOS
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作者 Tian Feng Yang Zhen 《Journal of Electronics(China)》 2009年第5期588-599,共12页
We study a spectrum sharing problem where multiple systems coexist and interfere with each other. First, an analysis is proposed for distributed spectrum sharing based on Prisoners' Dilemma (PD) in Cognitive Radio... We study a spectrum sharing problem where multiple systems coexist and interfere with each other. First, an analysis is proposed for distributed spectrum sharing based on Prisoners' Dilemma (PD) in Cognitive Radios (CRs). In one-shot game, selfish and rational CRs greedily full spread their own spectrum space in order to maximize their own rates, which leads to Nash Equilibrium (N.E.). But with long term interaction, i.e., Iterated Prisoner's Dilemma (IPD), CRs can come to cooperate and acquire the social optimal point by using different evolutionary strategies such as Tit For Tat (TFT), Generous TFT (GTFT), etc. Also we compare the performances of the different evolutionary strategies in noise-free and noisy environments for two-player games. Finally, N-player IPD (N-IPD) is simulated to verify our conclusions that TFT is a good strategy for spectrum sharing in CRs. 展开更多
关键词 Cognitive Radio (CR) Iterated Prisoner's Dilemma (IPD) Spectrum sharing Evolutionary strategies Gaussian interference channel
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PIR-based data integrity verification method in sensor network
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作者 Yong-Ki Kim Kwangnam Choi +1 位作者 Jaesoo Kim JungHo Seok 《Journal of Central South University》 SCIE EI CAS 2014年第10期3883-3888,共6页
Since a sensor node handles wireless communication in data transmission and reception and is installed in poor environment, it is easily exposed to certain attacks such as data transformation and sniffing. Therefore, ... Since a sensor node handles wireless communication in data transmission and reception and is installed in poor environment, it is easily exposed to certain attacks such as data transformation and sniffing. Therefore, it is necessary to verify data integrity to properly respond to an adversary's ill-intentioned data modification. In sensor network environment, the data integrity verification method verifies the final data only, requesting multiple communications. An energy-efficient private information retrieval(PIR)-based data integrity verification method is proposed. Because the proposed method verifies the integrity of data between parent and child nodes, it is more efficient than the existing method which verifies data integrity after receiving data from the entire network or in a cluster. Since the number of messages for verification is reduced, in addition, energy could be used more efficiently. Lastly, the excellence of the proposed method is verified through performance evaluation. 展开更多
关键词 data integrity VERIFICATION private information retrieval sensor network
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Baseband ASIP Design for SDR
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作者 LIU Dake 《China Communications》 SCIE CSCD 2015年第7期60-72,共13页
Baseband ASIP designs for handsets are discussed based on the author's R&D backgrounds. Algorithms for 4G, 3G, and WLAN are analyzed and selected for implementation based on the trade off of cost and performan... Baseband ASIP designs for handsets are discussed based on the author's R&D backgrounds. Algorithms for 4G, 3G, and WLAN are analyzed and selected for implementation based on the trade off of cost and performance with power consumption in mind. A SDR ASIP baseband system architecture is proposed for 4G and 3G mobile handsets. Function partitions for heterogeneous symbol processors are introduced to get higher performance over cost. Three structures for DFE, FFE, and Matrix symbol ASIP are proposed. The concept of bit parallel processor is introduced. Challenges of baseband processors for UDN of 5G were briefly introduced. Conclusions on ASIP architecture and system design are given for different baseband processors on different products. 展开更多
关键词 baseband ASIP architecture selection SDR
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Path loss modelling and comparison based on the radio propagation measurement at 3.5GHz 被引量:4
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作者 王萍 Li Yingzhe +2 位作者 Chang Ruoting Sun Kun Xu Hui 《High Technology Letters》 EI CAS 2009年第3期272-276,共5页
Wideband IMT-Advanced mobile communication systems tend to operate in the high frequency bands due to a relatively large capacity available. Thus, Measurement and modelling methods of radio propaga- tion eharaeteristi... Wideband IMT-Advanced mobile communication systems tend to operate in the high frequency bands due to a relatively large capacity available. Thus, Measurement and modelling methods of radio propaga- tion eharaeteristics are proposed for the field test of Chinese 4th generation (4G) trial system. The mea- surement system is established for 3.5GHz based on the sophistieated measurement instruments and the virtual instrument teehnology. The characteristic parameters of radio propagation sueh as path loss (PL) exponent and shadow fading standard deviation are extracted from measurement data, which result in the path loss model finally. The comparisons with other existing international models results validate our mea- surement in terms of path loss model. Based on the analysis of the existing extension model assumed for the microwave frequency at 3.5GHz, we find that the Stanford University Interim (SUI) model fits very well with the measurement result in the hotspot scenario, while the COST 231 model is closer to the mea- surement result in the suburban scenario. This result provides a measurement-based channel referenee for the development of the future IMT-Advanced systems in China. 展开更多
关键词 IMT-advaneed channel measurement channel model path loss radio propagation Stanford University Interim (SUI) COST 231 Hata WINNER
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