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Analysis of period doubling bifurcation and chaos mirror of biped passive dynamic robot gait

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Chinese Science Bulletin 2012年第14期57卷 1743-1750页

作者： ZHAO Jie WU xiaoguang ZANG XiZhe yan JiHong State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150080 China

With a reasonable parameter configuration,the passive dynamic walking model has a stable,efficient,natural periodic gait,which depends only on gravity and inertia when walking down a slight *** fact,there is a delicate balance in the energy conversion in the stable periodic gait,making the gait adjustable by changing the model ***é mapping is combined with Newton-Raphson iteration to obtain the numerical solution of the final state of the passive dynamic walking *** addition,a simulation on the walking gait of the model is performed by increasing the slope step by step,thereby fixing the model's parameters ***,the gait features obtained in the different slope stages are analyzed and discussed,the intrinsic laws are revealed in *** results indicate that the gait can present features of a single period,doubling period,the entrance of chaos,merging of sub-bands,and so on,because of the high sensitivity of the passive dynamic walking to the *** a global viewpoint,the gait becomes chaotic by way of period doubling bifurcation,with a self-similar Feigenbaum fractal structure in the *** the entrance of chaos,the gait sequence comprises a Cantor set,and during the chaotic stage,sub-bands in the final-state diagram of the robot system present as a mirror of the period doubling bifurcation.

关键词：倍周期分岔步态分析机器人系统 Cantor集模型参数混沌动态行走参数配置

Collaborative Design in PDM / 3D CAD Integrated Environment

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Wuhan University Journal of Natural Sciences 2006年第3期11卷 642-648页

作者： CHEN Zhuoning ZHANG Fen yan xiaoguang BIN Hongzan School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China

Some key issues in supporting collaborative design in product data management（PDM ） system and 3D computer aided design（CAD） system integrated environment are analyzed. The general architecture of the integrated environment is divided into five tiers and employs the transparently integrated mode, with the mode, function calling and information exchanging among independent PDM and CAD processes are carried out via message translation /parse approach. Product layout feature（PLF ） model definition is presented, PLF model is used to represent design intention at the preliminary design phase. The collaborative design methodology employing the PLF model in PDM/3D CAD integrated environment is analyzed. The design methodology can speed up the design process, reduce the investment and improve the product quality.

关键词： PDM/3D CAD integrated product layout feature collaborative design transparently integrated mode

Orthogonal Classes and Relative Gorenstein Modules

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Journal of Mathematical Research with Applications 2024年第1期44卷 25-34页

作者： Jingrui SU yanjiong yanG xiaoguang yan Department of Mathematics Taizhou University School of Information Engineering Nanjing Xiaozhuang University

In this paper, we study the relations between the class of A-Gorenstein projective modules and the left orthogonal class of A, also the relations between the class of A-Gorenstein injective modules and the right orthogonal class of A. Some functor characterizations of AGorenstein projective modules and A-Gorenstein injective modules are obtained. Using the notion of complete duality pair, we discuss the relations between A-Gorenstein projective modules and B-Gorenstein flat modules. Some known results are generalized.

关键词： Gorenstein module orthogonal class duality pair Mittag-Leffler condition

Identification of two novel B-cell epitopes on the nucleocapsid protein of porcine deltacoronavirus

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Virologica Sinica 2022年第2期37卷 303-306页

作者： Haojie Ren xiaoguang yan Lintao Liu Yixuan Zhang Qianqian Li Xiumei Li Hui Hu College of Veterinary Medicine Henan Agricultural UniversityZhengzhou450002China Key Laboratory for Animal-derived Food Safety of Henan Province Zhengzhou450002China Luoyang Laipson Information Technology Co. LtdLuoyang471026China

Dear Editor,Porcine deltacoronavirus(PDCoV)is a novel discovered swine enteric coronavirus which can cause diarrhea and dehydration in pigs,particularly in neonatal piglets(Jung et al.,2016).At present,there are no commercial vaccines available for PDCo *** control PDCoV transmission and perform antiviral therapy efficiently,a rapid and accurate diagnostic method to detect PDCo V is needed.

关键词： swine delta needed

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直线滚动导轨副的沟槽结构及其选用

机械设计与研究 2000年第1期16卷 39-40页

作者：严晓光华中理工大学武汉430074

侧重于用户的角度介绍常用的整体滑块、球支承直线滚动导轨副的沟槽结构、接触状况。

关键词：直线滚动导轨副沟槽结构适用范围

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PDM系统的安全架构与策略研究

计算机工程 2006年第14期32卷 154-156,159页

作者：朱志严晓光华中科技大学软件学院武汉430074

运用了软件工程的方法和观点,从数据加密防护和阻止系统入侵两个不同的角度,对PDM系统的信息安全问题进行了系统的剖析,建立起PDM系统软件设计的安全架构,提出PDM系统运行和维护的安全策略,重点讨论在确保PDM系统安全和高效运行的前提下... 详细信息

运用了软件工程的方法和观点,从数据加密防护和阻止系统入侵两个不同的角度,对PDM系统的信息安全问题进行了系统的剖析,建立起PDM系统软件设计的安全架构,提出PDM系统运行和维护的安全策略,重点讨论在确保PDM系统安全和高效运行的前提下,如何设计安全的系统架构来保护数据的安全和防止系统入侵,从而提高PDM系统的安全级别。

关键词： PDM 加密解密虚拟专用网入侵检测安全架构

Modulation of gut microbiota by berberine and decocted Coptis chinensis *** a high-fat diet-induced metabolic syndrome rat model

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Journal of Traditional Chinese Medical Sciences 2017年第2期4卷 149-157页

作者： Ti Huang Xu yan xiaoguang yan Fei Huang Jie Li Juncai Xiao Yi Li Dongzhimen Hospital Beijing University of Chinese MedicineBeijing 100700China Department of Traditional Chinese Medicine Beijing HospitalBeijing 100730China BGI College Shenzhen518083China Department of Endocrinology Traditional Chinese Medicine Hospital in Pinggu DistrictBeijing101200China

Objective:To investigate the effect of decocted Coptis chinensis Franch.(Huanglian Jianji,黄连煎剂,HLJJ) and berbenne on the gut microbiota of the rats with metabolic syndrome (MS) induced by high-fat diet (HFD).Methods:Sixty Sprague Dawley rats were randomly divided into normal diet (ND) group (n =15)and HFD group (n =45).After 8 weeks of feeding,the HFD group was further divided into three groups:a group provided with a combination of HLJJ and HFD for 4 weeks,a group provided with a combination of berberine and HFD for 4 weeks,and a group supplied only with HFD for 4 consecutive *** fat weight,serum high-density lipoproteincholesterohC (HDL-C),lowdensity lipoproteincholesterol-C (LDL-C) and irisin levels were *** addition,the V3-V4 region of the cecum microbiota 16S rRNA gene amplicon was sequenced on the Illumina MiSeq ***:MS was successfully induced in the rats with HFD for 8 *** 12 weeks,serum irisin levels in the HFD + berberine group were significantly increased compared with those in the HFD group (P <.05).The high-quality tags were delineated into 1149 operational taxonomic units at a 97% similarity ***,at the genus level,Akkermansia muciniphila (***),Bacteroides,and Ruminococcus were markedly increased,whereas Candidatus arthromitus,Prevotella,Phascolarctobacterium were in great decrease in the HLJJ group and the berberine group,compared with the HFD *** abundance of ***,Ruminococcus gnavus and Bacteroides was significantly higher in the berberine group,whereas,the abundance of Oscillospira was lower in the berberine group,compared with the HLJJ ***:HLJJ and berberine changed the gut microbiota in rats with *** mechanism underlying the treatments of berberine and HLJJ on HFD-induced MS is partly different.

关键词： Metabolic syndrome Gut microbiota Decocted Coptis chinensis Franch.(HLJJ) Berberine High-fat diet

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大规模定制下的产品配置设计研究

华中科技大学学报（自然科学版） 2005年第2期33卷 99-102页

作者：张芬陈卓宁严晓光华中科技大学机械科学与工程学院湖北武汉430074

研究了大批量定制下的基于产品族模型的产品配置设计,分析了从细分客户群中相同需求和不同需求映射到产品族的基本组成、可变因素和配置规则的过程.在此基础上,建立了产品族模型的通用结构.通用结构中的每个零部件都是一个独立对象,对... 详细信息

研究了大批量定制下的基于产品族模型的产品配置设计,分析了从细分客户群中相同需求和不同需求映射到产品族的基本组成、可变因素和配置规则的过程.在此基础上,建立了产品族模型的通用结构.通用结构中的每个零部件都是一个独立对象,对象通过装配关系形成复杂的多层产品结构,这样每个零部件都能够方便的被其他零部件借用,以降低零部件的多样化.零部件被分为普通零部件和构件,普通零部件对应于产品族的基本组成,构件用来表达产品结构的可变因素.配置规则也被存储为对象并通过“与”、“或”、“非”的逻辑组合形成复合规则.因此本产品族模型能够充分反映客户需求,并且能够被计算机系统快速识别解析.开发了产品配置器软件系统,此软件系统支持采用基于C++标准格式的脚本程序、部分Visual扩展程序以及类SQL语言编写的配置规则,能够成功完成在具有千个节点以上的通用产品结构中匹配配置规则得到符合客户需求的产品结构实例的任务.目前此软件系统已经在汽车行业企业应用.

关键词：软件系统产品配置设计对象构件通用脚本程序产品族配置规则客户需求大规模定制

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计算机辅助设计变位系数封闭图及其应用

机械设计与研究 1999年第2期15卷 54-55,80页

作者：白跃伟严晓光陈卓宁华中理工大学开目集成技术责任有限公司

分析了各种变位系数选取方法及变位系数封闭图的数学模型，用计算机辅助实时设计变位系数封闭图，在封闭图中选取变位系数时动态设计、显示齿轮强度等多项与传动质量指标相关数据，并通过计算实例与传统设计方法进行了比较。

关键词：变位系数封闭图 CAD 齿轮传动