检索结果-南通市图书馆

Overcoming Spatial Constraints in VR:A Survey of Redirected Walking Techniques

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2024年第4期39卷 841-870页

作者： Jia-Hong Liu Yang-Fu ren Qi Wen gan Kui Huang Fiona xiao Yu Chen Er-xia Luo Khang Yeu Tang Yue-Yao Fu Cheng-Wei Fan Sen-Zhe Xu Song-Hai Zhang Academy of Arts and Design Tsinghua UniversityBeijing 100084China Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China College of Computer Technology and Application Qinghai UniversityXining 810016China Zhili College Tsinghua UniversityBeijing 100084China School of Computer Beijing Information Science and Technology UniversityBeijing 100192China Department of Physics Tsinghua UniversityBeijing 100084China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China

As the virtual reality(VR)technology strives to provide immersive and natural user experiences,the challenge of aligning vast virtual environments with limited physical spaces remains *** survey comprehensively explores the advancements in redirected walking(RDW)techniques aimed at overcoming spatial constraints in *** addresses this by subtly manipulating users’physical movements to allow for seamless navigation within constrained *** survey delves into gain perception mechanisms,detailing how slight discrepancies between virtual and real-world movements can be utilized without user awareness,thus extending the effective navigable *** RDW control algorithms for gain-based RDW are analyzed,highlighting their implementation and effectiveness in maintaining immersion and minimizing perceptual ***,novel methods extending beyond traditional gain-based techniques are discussed,showcasing innovative approaches that further refine VR *** practical implications of RDW in enhancing safety and reducing physical collisions in VR environments are underscored,alongside its potential to improve user experience by aligning virtual exploration more closely with natural human behavior *** a thorough review of existing literature and recent advancements,this survey provides a systematic understanding for researchers,developers,and industry *** underscores the importance of RDW in the future of VR,emphasizing RDW's role in making VR more accessible and practical across various applications,from education and training to therapy and *** paper concludes with a forward-looking perspective on the continued evolution and potential of RDW in revolutionizing virtual reality experiences.

关键词： virtual reality(VR) redirected walking(RDW) redirection gain perception

基于强化图卷积和时空循环门的区块链非法交易检测方法

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

计算机应用研究 2024年第9期41卷 2592-2597页

作者：夏鑫任秀丽辽宁大学信息学院沈阳110036

区块链非法交易检测任务需要充分挖掘历史交易数据中固有的时间和空间特征。针对现有的非法交易检测方法存在误差较大的问题,提出一种基于强化图卷积和时空循环门的区块链非法交易检测方法(RgCN-SRg)。首先,利用比特币区块链历史交易数... 详细信息

区块链非法交易检测任务需要充分挖掘历史交易数据中固有的时间和空间特征。针对现有的非法交易检测方法存在误差较大的问题,提出一种基于强化图卷积和时空循环门的区块链非法交易检测方法(RgCN-SRg)。首先,利用比特币区块链历史交易数据构造交易图谱,引入一组具有不同尺寸卷积核的强化图卷积网络(RgCN),全面地提取该图谱的拓扑信息并生成特征向量;另外,考虑到区块链交易的时序特点,提出一种时空循环门结构(SRg),在传统门结构中引入图卷积运算,以提取交易图多个时空维度的依赖信息;最后,经过一个线性层和激活函数输出非法交易检测的预测结果。将提出的方法与gCN、DEDgAT、EgT以及gCN+MLP进行比较,在F 1方面,分别提高了18.4、10.7、9.3和4.9百分点;在精度方面,分别提高了11.5、11.2、7.7和3.7百分点。

关键词：区块链比特币网络图卷积网络非法交易识别

Multi-omics joint analysis revealed the metabolic profile of retroperitoneal liposarcoma

在线全文

学校读者我要写书评

暂无评论

Frontiers of Medicine 2024年第2期18卷 375-393页

作者： Fu’an Xie Yujia Niu Lanlan Lian Yue Wang Aobo Zhuang guangting Yan Yantao ren xiaobing Chen Mengmeng xiao Xi Li Zhe Xi gen Zhang Dongmei Qin Kunrong Yang Zhigang Zheng Quan Zhang xia.gang xia Peng Li Lingwei gu Ting Wu Chenghua Luo Shu-Hai Lin Wengang Li Cancer Research Center Xiang’an Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamen361102China State Key Laboratory of Cellular Stress Biology School of Life SciencesFaculty of Medicine and Life SciencesXiamen UniversityXiamen361102China xiamen University Research Center of Retroperitoneal Tumor Committee of Oncology Society of Chinese Medical Association Xiamen UniversityXiamen361102China Department of Laboratory Medicine Xiang’an Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamen361102China Department of Retroperitoneal Tumor Surgery Peking University International HospitalBeijing102206China School of Public Health Harvard UniversityBostonMA02115USA Laboratory of Biochemistry and Molecular Biology Research Department of Clinical LaboratoryFujian Medical University Cancer HospitalFuzhou350014China Surgery Department Affiliated Fuzhou First Hospital of Fujian Medical UniversityFuzhou350009China National Institute for Data Science in Health and Medicine Xiamen UniversityXiamen361102China Department of Hepatobiliary Surgery Xiang’an Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamen361102China

Retroperitoneal liposarcoma(RLPS)is the main subtype of retroperitoneal soft sarcoma(RSTS)and has a poor prognosis and few treatment options,except for *** proteomic and metabolic profiles of RLPS have remained *** aim of our study was to reveal the metabolic profile of ***,we performed proteomic analysis(n=10),metabolomic analysis(n=51),and lipidomic analysis(n=50)of retroperitoneal dedifferentiated liposarcoma(RDDLPS)and retroperitoneal well-differentiated liposarcoma(RWDLPS)tissue and paired adjacent adipose tissue obtained during *** analysis mainly revealed that glycolysis,purine metabolism,pyrimidine metabolism and phospholipid formation were upregulated in both RDDLPS and RWDLPS tissue compared with the adjacent adipose tissue,whereas the tricarboxylic acid(TCA)cycle,lipid absorption and synthesis,fatty acid degradation and biosynthesis,as well as glycine,serine,and threonine metabolism were *** particular importance,the glycolytic inhibitor 2-deoxy-D-glucose and pentose phosphate pathway(PPP)inhibitor RRX-001 significantly promoted the antitumor effects of the MDM2 inhibitor Rg7112 and CDK4 inhibitor *** study not only describes the metabolic profiles of RDDLPS and RWDLPS,but also offers potential therapeutic targets and strategies for RLPS.

关键词： RLPS proteomics metabolomics lipidomics metabolism

第一性原理计算研究γ'-Co3(V,M)(M=Ti,Ta)相的结构稳定性、力学和热力学性质

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

物理学报 2024年第8期73卷 261-272页

作者：袁文翎姚碧霞李喜胡顺波任伟上海大学材料基因组工程研究院上海200444 上海大学高品质特殊钢冶金与制备国家实验室上海200444 上海交通大学上海市先进高温材料及精密成形重点实验室上海200240 上海大学文化遗产保护基础科学研究院上海200444 上海大学物理系量子与分子结构国际中心上海200444

本文采用基于密度泛函理论的第一性原理计算方法并结合准谐德拜模型,对Co基高温合金中γ'-Co_(3)(V,M)(M=Ti,Ta)相的结构稳定性、热力学性质以及有限温度下的力学性质进行了系统的研究和讨论.结果表明,γ'-Co_(3)(V,M)相能以L12结构稳... 详细信息

本文采用基于密度泛函理论的第一性原理计算方法并结合准谐德拜模型,对Co基高温合金中γ'-Co_(3)(V,M)(M=Ti,Ta)相的结构稳定性、热力学性质以及有限温度下的力学性质进行了系统的研究和讨论.结果表明,γ'-Co_(3)(V,M)相能以L12结构稳定存在,其具有良好的抵抗变形的能力.γ'-Co_(3)(V,Ti)相的热力学性能对温度的敏感性要大于γ'-Co_(3)(V,Ta)相,且γ'-Co_(3)(V,M)相具有高温稳定性.在有限温度下,随着温度的升高,γ'-Co_(3)(V,M)相由塑性材料向脆性材料过渡转变,而且,除了硬度性能有所提升外,γ'-Co_(3)(V,MM=Ti,Ta)相的力学性能均呈下降趋势.

关键词：高温合金第一性原理结构稳定性热力学性质

FRP网格-ECC复合层加固混凝土界面定量化处理及黏结性能试验研究

在线全文

学校读者我要写书评

暂无评论

建筑结构学报 2024年第5期45卷 207-217页

作者：潘毅任宇郭瑞高子祁夏毛瑶西南交通大学土木工程学院四川成都610031 西南交通大学抗震工程技术四川省重点实验室四川成都610031

针对传统纤维增强复合材料(fiber reinforced polymer, FRP)网格-工程水泥基复合材料(engineered cementitious composites, ECC)复合层加固钢筋混凝土(reinforced concrete, RC)结构存在界面处理质量无法保证的问题,提出通过对混凝土... 详细信息

针对传统纤维增强复合材料(fiber reinforced polymer, FRP)网格-工程水泥基复合材料(engineered cementitious composites, ECC)复合层加固钢筋混凝土(reinforced concrete, RC)结构存在界面处理质量无法保证的问题,提出通过对混凝土表面钻孔定量化描述界面粗糙度的改良FRP网格-ECC复合层加固方法,并建立了粗糙度评价指标,即界面处理率。为研究不同界面处理率下复合层与混凝土之间的界面黏结性能,开展复合层抗拉试验研究其材料性能,并对4组12个双剪试件进行试验,考察不同界面处理率对复合层与混凝土黏结剪切性能的影响。研究结果表明:复合层的拉伸应力-应变曲线呈双线性,抗拉强度为10.62 MPa,极限拉应变为0.0138;未界面处理的试件发生了界面剥离破坏,经界面处理后试件随着界面处理率的增大,破坏模式逐渐从临界断裂破坏向复合层断裂破坏过渡,即定量化界面处理的改良加固法可抑制界面的剥离,且可在一定程度上控制界面破坏形态;基于现有FRP片材-混凝土的黏结滑移模型,并考虑FRP网格-ECC复合层整体受力行为和界面处理率,建立FRP网格-ECC复合层与混凝土界面的黏结滑移模型和承载力计算式,承载力计算值与试验值之比平均值为1.107,二者吻合良好。

关键词： FRP网格-ECC复合层混凝土界面处理双剪试验黏结滑移模型承载力

基于反向传播-自适应提升算法的谐波阻抗估计

在线全文

学校读者我要写书评

暂无评论

电力系统及其自动化学报 2024年第3期36卷 118-125页

作者：夏焰坤任俊杰西华大学电气与电子信息学院成都610039

目前,关于量化谐波阻抗的研究大多数是基于系统侧谐波阻抗不发生改变而设定,当系统谐波阻抗变动时,如何估计谐波阻抗的研究相对较少。为此,本文提出一种基于系统谐波阻抗变动背景下的系统谐波阻抗估计新方法。首先,加窗处理谐波电压、... 详细信息

目前,关于量化谐波阻抗的研究大多数是基于系统侧谐波阻抗不发生改变而设定,当系统谐波阻抗变动时,如何估计谐波阻抗的研究相对较少。为此,本文提出一种基于系统谐波阻抗变动背景下的系统谐波阻抗估计新方法。首先,加窗处理谐波电压、电流测量数据,使用二元线性回归法估算系统谐波阻抗,并用小波包变换对测量数据进行分段,以找出系统谐波阻抗变动的时间;其次,采用反向传播-自适应提升算法精确量化每个采样数据段的系统谐波阻抗;最后,通过仿真与实例分析验证本文方法相较于其他方法具有更好的鲁棒性和精确性。

关键词：系统侧谐波阻抗小波包变换法反向传播-自适应提升算法鲁棒性

在线全文

学校读者我要写书评

暂无评论

生态环境视野下金代上京路移民与农业开发

北方文物 2024年第4期 92-97页

作者：夏宇旭任永幸吉林师范大学历史文化学院

上京路是金代前期的腹心地带,称为金源内地,同时,也是移民聚集区。在移民未迁入之前,这里山环水绕,林草丰茂,土地肥沃,地广人稀,生态环境优良,为移民耕垦提供了充分且便利的条件。迁入上京路的移民依托本区良好的生态资源,以四个聚集区... 详细信息

上京路是金代前期的腹心地带,称为金源内地,同时,也是移民聚集区。在移民未迁入之前,这里山环水绕,林草丰茂,土地肥沃,地广人稀,生态环境优良,为移民耕垦提供了充分且便利的条件。迁入上京路的移民依托本区良好的生态资源,以四个聚集区为中心进行农业开发,不仅改变了上京路土地资源的利用方式,提高了自然生产力,促进了文明的进步和民族融合,同时也改变了本区的植被面貌和生态格局。尽管移民大量开发土地,但总体来讲,金代上京路的生态环境依然处于良性循环状态,人地关系相对和谐。

关键词：生态环境金代移民

Fufang E’jiao Jiang’s effect on immunity,hematopoiesis,and angiogenesis via a systematic“compound-effect-target”analysis

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第5期13卷 2813-2832页

作者： xia.g Li xiao Xu Ying Dong Shusheng Fan Xueyang ren Yuan Zheng Jiamu Ma Feng Zhang Qingyue Deng xianxian Li Yingyu He Mengyu Sun Wei Liu Mengxia Li Qing xia Yan Zhang gaimei She School of Chinese Materia Medica Beijing University of Chinese MedicineBeijing 102488China Biology Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan 250103China National Engineering Research Center for gelatin-based Traditional Chinese Medicine Dong-E-E-Jiao Co.Ltd.Liaocheng 252201China

Fufang E’jiao Jiang(FEJ)as a healthy food consisting of medicine food homology materials approved by China’s Ministry of Health has been extensively applied to replenish qi and nourish blood,and it has a positive impact on women’s *** find out the material basis and mechanism of FEJ,a systematic“compoundeffect-target”analysis including chemical composition resolution,zebrafish,network pharmacology,molecular docking,transcriptome,and bibliometric analysis was adopted.124 chemical components including ginsenosides,and phenylethanoid glycosides in FEJ were discovered,and effects of FEJ on promoting the generation of immune cells,erythropoiesis and angiogenesis in zebrafish were *** on network pharmacology,molecular docking and in vivo activity assay,6 compounds including jionoside A1,isoacteoside,echinacoside,acteoside,lobetyolin,and rehmannioside D were identified as active components of *** data showed that several pathways such as complement and coagulation cascades,ECM-receptor interaction,and PI3K-Akt signaling pathway were associated with proangiogenic effect of FEJ.19 common targets were obtained through combined analysis of network pharmacology and transcriptomics,and 5 targets of them were verified by *** bibliometric analysis of these common targets revealed that FEJ was related to energy metabolism,pathway in cancer,etc.,which was consistent with the results of network pharmacology and *** studies suggested that FEJ could replenish qi and nourish blood through multi-compound and multi-targets.

关键词： Fufang E’jiao Jiang Zebrafish(Danio rerio) Network pharmacology Transcriptome Bibliometrics

Anisotropy measurements and characterization of the Qingshankou shale

在线全文

学校读者我要写书评

暂无评论

Applied geophysics 2024年第3期21卷 468-478,617页

作者： Li Qing-feng Yan Xue-hong Yan Wei-lin ren Li Wang Peng Han Jian-qiang xia Xue Chen Hao Daqing Oilfield Exploration Division Daqing163000HeilongjiangChina Daqing Branch Company of CNPC Logging Daqing163000HeilongjiangChina Exploration and Development Research Institute of Daqing Oilfield Co. Ltd.Daqing163712China State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing100190China

Qingshankou shale(gulong area,China)exhibits strong acoustic anisotropy characteristics,posing significant challenges to its exploration and *** this study,the five full elastic constants and multipole response law of the Qingshankou shale were studied using experimental *** show that the anisotropy parametersϵandγin the study region are greater than 0.4,whereas the anisotropy parameterδis smaller,generally *** simulations show that the longitudinal and transverse wave velocities of these strong anisotropic rocks vary significantly with inclination angle,and significant differences in group velocity and phase velocity are also *** logging measures the group velocity in dipped boreholes;this differs from the phase velocity to some *** the dip angle increases,the longitudinal and SH wave velocities increase accordingly,while the qSV-wave velocity initially increases and then decreases,reaching its maximum value at a dip of approximately 40°.These results provide an effective guide for the correction and modeling of acoustic logging time differences in the region.

关键词： Transverse isotropy anisotropy parameter sonic logging group velocity phase velocity