检索结果-南通市图书馆

Hardware Architecture of Polyphase Filter Banks Performing Embedded Resampling for Software-Defined Radio Front-Ends

引用

ZTE Communications 2012年第1期10卷 54-62,70页

作者： Mehmood Awan yannick le moullec Peter Koch Fred Harris Technology Platforms Section Dept. of Electronic Systems Aalborg University Dept. of Electrical & Computer Engineering San Diego State University

In this paper, we describe resourceefficient hardware architectures for softwaredefined radio （SDR） frontends. These architectures are made efficient by using a polyphase channelizer that performs arbitrary sample rate changes, frequency selection, and bandwidth control. We discuss area, time, and power optimization for field programmable gate array （FPGA） based architectures in an Mpath polyphase filter bank with modified Npath polyphase filter. Such systems allow resampling by arbitrary ratios while simultaneously performing baseband aliasing from center frequencies at Nyquist zones that are not multiples of the output sample rate. A nonmaximally decimated polyphase filter bank, where the number of data loads is not equal to the number of M subfilters, processes M subfilters in a time period that is either less than or greater than the Mdataload ＇ s time period. We present a loadprocess architecture （LPA） and a runtime architecture （RA）（based on serial polyphase structure） which have different scheduling. In LPA, Nsubfilters are loaded, and then M subfilters are processed at a clock rate that is a multiple of the input data rate. This is necessary to meet the output time constraint of the down-sampled data. In RA, Msubfilters processes are efficiently scheduled within Ndataload time while simultaneously loading N subfilters. This requires reduced clock rates compared with LPA, and potentially less power is consumed. A polyphase filter bank that uses different resampling factors for maximally decimated, underdecimated, overdecimated, and combined upand downsampled scenarios is used as a case study, and an analysis of area, time, and power for their FPGA architectures is given. For resourceoptimized SDR frontends, RA is superior for reducing operating clock rates and dynamic power consumption. RA is also superior for reducing area resources, except when indices are prestored in LUTs.

关键词： SDR FPGA Digital Frontends Polyphase Filter Bank Embedded Resampling

来源：

维普期刊数据库

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

Polyphase Filter Banks for Embedded Sample Rate Changes in Digital Radio Front-Ends

引用

ZTE Communications 2011年第4期9卷 3-9页

作者： Mehmood Awan yannick le moullec Peter Koch Fred Harris Technology Platforms Section Dept. of Electronic Systems Aalborg University Denmark Dept. of Electrical & Computer Engineering San Diego State UniversityCA USA

This paper presents efficient processing engines for software-defined radio （SDR） front-ends. These engines, based on a polyphase channelizer, perform arbitrary sample-rate changes, frequency selection, and bandwidth control. This paper presents an M-path polyphase filter bank based on a modified N-path polyphase filter. Such a system allows resampling by arbitrary ratios while performing baseband aliasing from center frequencies at Nyquist zones that are not multiples of the output sample rate. This resampling technique is based on sliding cyclic data load interacting with cyclic-shifted coefficients. A non-maximally-decimated polyphase filterbank （where the number of data loads is not equal to the number of M subfilters） processes M subfilters in a time period that is less than or greater than the M data loads. A polyphase filter bank with five different resampling modes is used as a case study for embedded resamp/ing in SDR front-ends. These modes are （i） maximally decimated, （ii） Under-decimated, （iii） over-decimated, and combined up- and down-sampling with （iv） single stride length, and （v） multiple stride lengths. These modes can be used to obtain any required rational sampling rate change in an SDR front-end based on a polyphase channelizer. They can also be used for translation to and from arbitrary center frequencies that are unrelated to the output sample rates.

关键词： SDR digital front-ends polyphase filter bank embedded resampling

来源：

维普期刊数据库

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

Spallation Process of Thermally Grown Oxides by In-Situ CCD Monitoring Technique

引用

Journal of Iron and Steel Research International 2009年第6期16卷 90-94页

作者： QI Yu-hong Philippe Lours yannick le Maoult Materials Science and Engineering Department Dalian Maritime University Dalian 116026 Liaoning China Research Centre on Tools Materials and Processes Ecole des Mines 81013 Albi France

In cooling process of Fe-Cr-Al alloy oxidized at 1 300 ℃, the effect of cooling speed and exposure time on oxide spalled area fraction and successive variety of the spalled region were studied by investigating evolvement of the thermally grown oxide using in-situ CCD monitoring technique. The results showed that oxide spallation can be restrained by controlling cooling speed and the critical temperature drop of spallation initiation which is closely related to the oxide thickness or exposure time, and the spallation process of a little region may be described in more detail as two routes： from the oxide/substrate interface micro-decohesion, micro-buckles, buckle spreading, buckle crack to spallation and from the interface micro-decohesion, micro-buckles, buckle crack and spallation to the residual oxide decohesion and spallation.

关键词： in-situ CCD monitoring technique spallation thermally grown oxide Fe-Cr-AI

来源：

维普期刊数据库

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

A self-stabilised walking gait for humanoid robots based on the essential model with internal states

引用

IET Cyber-Systems and Robotics 2022年第4期4卷 283-297页

作者： Qiuyue Luo Christine Chevallereau Yongsheng Ou Jianxin Pang Victor De-león-Gómez yannick Aoustin Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhenChina Research Institute of UBTech Robotics ShenzhenChina Laboratoire des Sciences du Numerique de Nantes(LS2N) CNRSCentrale NantesNantes UniversitéNantesFrance FCA at the Univerdidad Autónoma de Coahuila TorreónMéxico

Walking stability is one of the key issues for humanoid robots.A self-stabilised walking gait for a full dynamic model of humanoid robots is *** simplified models,that is,the linear inverted pendulum model and variable-length inverted pendulum model,self-stabilisation of walking gait can be obtained if virtual constraints are properly *** result is extended to the full dynamic model of humanoid robots by using an essential dynamic model,which is developed based on the zero dynamics *** the proposed method,a robust stable walking for a humanoid robot is achieved by adjusting the step timing and landing position of the swing foot automatically,following its intrinsic dynamic *** exempts the robot from the time-consuming high-level control approaches,especially when a full dynamic model is *** different walking patterns/features(i.e.,the swing foot motion,the vertical centre of mass motion,the switching manifold configuration,etc.)affect the stability of the walking gait is *** are conducted on robots Romeo and TALOS to support the results.

关键词： dynamic stability humanoid and bipedal locomotion passive walking

来源：

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

热生长陶瓷薄膜在压应力作用下的脱落行为

引用

稀有金属材料与工程 2009年第S2期38卷 1150-1153页

作者：齐育红 Philippe Lours yannick le Maoult 张宗宝大连海事大学 Research Centre on Tools Materials & ProcessesEcoledes Mines

采用表面压痕技术和CCD监测技术研究了PM2000Fe-Cr-Al高温合金热生长氧化物陶瓷薄膜在压应力作用下的脱落行为。结果表明,表面压痕法产生的压痕周围裂纹区域面积和裂纹宽度可定性表征氧化物陶瓷薄膜附着能力,裂纹区域面积越大或裂纹越... 详细信息

采用表面压痕技术和CCD监测技术研究了PM2000Fe-Cr-Al高温合金热生长氧化物陶瓷薄膜在压应力作用下的脱落行为。结果表明,表面压痕法产生的压痕周围裂纹区域面积和裂纹宽度可定性表征氧化物陶瓷薄膜附着能力,裂纹区域面积越大或裂纹越宽薄膜附着能力越差;采用CCD摄像技术可以测得氧化物陶瓷薄膜初试脱落温度及脱落区域的形貌、位置、面积等数据。为进一步理解氧化物陶瓷薄膜的脱落机制提供了更多的信息。

关键词：热生长陶瓷薄膜脱落表面压痕技术 CCD监测技术

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Influence of"protective"symbionts throughout the different steps of an aphid-parasitoid interaction

引用

Current Zoology 2021年第4期67卷 441-453页

作者： Corentin Sochard Laura Bellec Jean-Christophe Simon yannick Outreman IGEPP INRAEInstitut AgroUniv Rennes35000RennesFrance IGEPP INRAEInstitut AgroUniv Rennes35650Le RheuFrance

Microbial associates are widespread in insects,some conferring a protection to their hosts against natural enemies like *** protective symbionts may affect the infection success of the parasitoid by modifying behavioral defenses of their hosts,the development success of the parasitoid by conferring a resistance against it or by altering life-history traits of the emerging ***,we assessed the effects of different protective bacterial symbionts on the entire sequence of the host-parasitoid interaction(i.e.,from parasitoid attack to offspring emergence)between the pea aphid,Acyrthosiphon pisum,and its main parasitoid,Aphidius ervi and their impacts on the life-history traits of the emerging *** test whether symbiont-mediated phenotypes were general or specific to particular aphid-symbiont associations,we considered several aphid lineages,each harboring a different strain of either Hamiltonella defensa or Regiella insecticola,two protective symbionts commonly found in *** found that symbiont species and strains had a weak effect on the ability of aphids to defend themselves against the parasitic wasps during the attack and a strong effect on aphid resistance against parasitoid *** parasitism resistance was mainly determined by symbionts,their effects on host defensive behaviors varied from one aphid-symbiont association to ***,the symbiotic status of the aphid individuals had no impact on the attack rate of the parasitic wasps,the parasitoid emergence rate from parasitized aphids nor the life-history traits of the emerging ***,no correlations between symbiont effects on the different stages of the host-parasitoid interaction was observed,suggesting no trade-offs or positive associations between symbiont-mediated *** study highlights the need to consider various sequences of the host-parasitoid interaction to better assess the outcomes of protective symbioses and understand the

关键词： Acyrthosiphon pisum defensive behaviors Hamiltonella defensa host-parasitoid interactions protective symbioses Regiella insecticola

来源：

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

Isolation and Characterization of Enterococci Bacteriocinic Strains from Tunisian Fish Viscera

引用

Food and Nutrition Sciences 2013年第6期4卷 701-708页

作者： Migaw Sarra Ghrairi Taoufik le Chevalier Patrick Brillet Benjamin Fleury yannick Hani Khaled Laboratoire Universitaire de Biodiversité et d’Ecologie Microbienne (EA3882) IFR148 ScInBioS Université de Brest Université Européenne de Bretagne IUT de Quimper 6 Rue de l’Université Quimper Cedex France. U12-ES03 Department of Biochemistry Faculty of Medicine Ibn El Jazzar University of Sousse Sousse Tunisia

A collection of lactic acid bacteria isolates from fish viscera was studied and investigated regarding to their functional properties and safety aspects. From these, three isolates GM1, GM2 and GM3 were identified as Enterococcus feacium species using molecular methods. Partial Amplified rDNA Restriction Analysis (partial ARDRA) with restriction enzyme HaeIII separated these isolates into distinctive group which suggest genotypic variability within enterococci strains isolated from fish viscera. The three strains GM1, GM2 and GM3 exhibited antimicrobial activity. Indeed strains have been shown to produce bacteriocins with inhibitory effect against food spoilage bacteria and pathogenic fish including Carnobacterium maltaromaticum. The molecular mass of bacteriocin, as calculated by tricine-SDS-PAGE, was found to be 4.5 kDa. All isolates were tested positive upon PCR amplification of enterocin A structural gene. Investigations of antibiotic resistance show that the isolates were mostly sensitive to several antibiotics (ampicillin, penicillin, tetracycline, gentamycine) and resistance to rifampicin. All isolates grow in esculin azide agar as a selective medium for enumeration of probiotic enterococci. This study suggests that our strains can be employed as probiotic or to improve the safety of food products.

关键词： Bacteriocins Fish Viscera Enterococcus Listeria Carnobacterium Probiotic

来源：

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

A Rare Case of Late LAD Reimplantation after Arterial Switch Operation

引用

Congenital Heart Disease 2022年第1期17卷 99-106页

作者： yannick Kabulo Kolela Maureen Klepper Geoffroy de Beco Thierry Sluysmans Alain Poncelet Department of Cardiovascular and Thoracic Surgery Cliniques Universitaires Saint-LucBrusselsBelgium Pôle de Recherche Cardiovasculaire Institut de Recherche Expérimentale et Clinique(IREC)Universite Catholique de Louvain and Division of Cardiothoracic and Vascular SurgeryCliniques Universitaires Saint-LucBrusselsBelgium Department of Pediatric Cardiology University Hospital Saint-LucBrusselsBelgium

Arterial switch operation(ASO)is a complex neonatal operation in which transfer of the coronary arteries origins is the key to *** events after a successful ASO are not *** describe a rare case of a child who underwent an ASO in the neonatal period with one coronary(LAD)described as atretic left in *** age seven,he developed myocardial ischemia due to retrograde flow with a steal phenomenon from the LAD into the pulmonary *** patient underwent a late LAD *** case underscores that even very small ostia should be translocated at the time of ASO.

关键词： Late LAD reimplantation arterial switch operation transposition of the great arteries congenital surgery

来源：

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

快速安全的实时以太网

引用

现代制造 2012年第21期 68-69页

作者： yannick le Heno

在那些有着很高实时性要求的应用中，例如快速调节或者监控应用中，要利用Safety NETP实时以太网系统组件（RTFL）来实现通讯和数据交换。实时以太网系统组件RTFL的节拍周期只有62．5gs，其抖动与事件理想的时间偏差可以达到100nm。因... 详细信息

在那些有着很高实时性要求的应用中，例如快速调节或者监控应用中，要利用Safety NETP实时以太网系统组件（RTFL）来实现通讯和数据交换。实时以太网系统组件RTFL的节拍周期只有62．5gs，其抖动与事件理想的时间偏差可以达到100nm。因此，在标准的以太网系统中，这种实时以太网系统组件有着很快的调节和控制速度。通过使用快速以太网，应用像Safety NETP这样的系统之后，可以大大缩短信号输入、输出时间（如图）。而很短的通讯循环使得控制系统能够在最短的第一时间里就得到当前的检测结果。

关键词：实时以太网以太网系统 Safety 安全时间偏差控制系统快速以太网快速调节

来源：

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

Acute Renal Failure during Progressive Systemic Sclerosis in the Regional University Teaching Hospital of Brest-La Cavale Blanche (France)

引用

Open Journal of Rheumatology and Autoimmune Diseases 2017年第3期7卷 158-166页

作者： Comlan Albert Dovonou Cossi Adébayo Alassani Séraphin Ahoui Lauren Gueguen Arthur Capdeville Elie Cornec-le Gall Laurent Doucet yannick le Meur Borgou Regional University Teaching Hospital Parakou Benin Regional University Teaching Hospital of Brest-La Cavale Blanche Brest France

Systemic scleroderma is a rare disease in which visceral manifestations occur, particularly peripheral vascular, digestive, cardiopulmonary and renal. It is pathology with a predilection for women. The present clinical case is that of a man with the renal complications of scleroderma and the difficulties of the treatment even in the developed countries like France. In the present case, the management of this disease required a high dose of corticosteroid therapy and extra-renal purification. Early detection of complications through a minimal clinical examination supplemented with paraclinic tests has proved necessary.

关键词： Systemic Sclerosis Acute Renal Failure Brest France

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：