检索结果-南通市图书馆

基于无监督学习的计算机通信网络异常数据流辨识方法

在线全文

学校读者我要写书评

暂无评论

计算机应用文摘 2024年第12期40卷 102-104页

作者：魏仕俊李云吴开平 75841部队长沙410000

当前,计算机通信网络异常数据流辨识矩阵的辨识效率有限,导致漏辨个数不断增加。为此,文章对基于无监督学习的计算机通信网络异常数据流辨识方法进行了设计和验证。首先,提取了异常数据流特征,在多状态的背景下提升了辨识效率,同时设置... 详细信息

当前,计算机通信网络异常数据流辨识矩阵的辨识效率有限,导致漏辨个数不断增加。为此,文章对基于无监督学习的计算机通信网络异常数据流辨识方法进行了设计和验证。首先,提取了异常数据流特征,在多状态的背景下提升了辨识效率,同时设置了多状态特征辨识矩阵。其次,设计了无监督学习通信网络异常数据流辨识模型,采用了动态跟踪核验实现数据流辨识处理。测试结果表明,导入4组虚拟的辅助网络异常数据流指令在3个周期内实现了异常数据流辨识,最终将漏辨个数控制在6个以内,说明该方法在无监督学习的辅助和支持下更为精准与高效,应用效果得到了明显提升,且针对性较强,具有创新意义。

关键词：无监督学习计算机通信网络异常异常数据流辨识方法通信识别

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

70 MPa高压氢气瓶阀密封技术研究

阀门 2024年第2期 191-194页

作者：周路云李前张伟鹏上海市特种设备监督检验技术研究院上海200062 上海百图低温阀门有限公司上海200949

全球正面对能源和环境的挑战,氢能源汽车已成为全球汽车行业的发展方向,车载储氢系统主要是由储氢气瓶、组合式瓶阀、溢流阀、减压阀、压力/温度传感器等组成,其中需要频繁开启的部件是组合式瓶阀,压力一般在35 MPa~70 MPa,最容易产生... 详细信息

全球正面对能源和环境的挑战,氢能源汽车已成为全球汽车行业的发展方向,车载储氢系统主要是由储氢气瓶、组合式瓶阀、溢流阀、减压阀、压力/温度传感器等组成,其中需要频繁开启的部件是组合式瓶阀,压力一般在35 MPa~70 MPa,最容易产生泄漏。目前车载氢能的储存压力一般为35 MPa, 70 MPa的也在进行技术攻关,不同于普通的工业用气瓶阀,70 MPa高压氢气瓶阀设计压力高,密封性能的可靠性直接影响了产品的使用安全。针对70 MPa高压氢气瓶阀密封材料进行研究,采用GB/T 528-2009标准对不同硬度和直径的O形密封圈进行性能试验,比较不同材料的密封性能,确保70 MPa高压氢气瓶阀密封性能安全可靠。

关键词：氢能高压氢气组合式瓶阀密封圈

Comparative Analysis of Regulatory Motif Discovery Tools for Transcription Factor Binding Sites

在线全文

学校读者我要写书评

暂无评论

Genomics, Proteomics & Bioinformatics 2007年第2期5卷 131-142页

作者： wei wei Xiao-Dan yu Department of Pathobiology Center of Computational Biology Institute of Basic Medical Sciences Beijing100850 China

In the post-genomic era, identification of specific regulatory motifs or transcription factor binding sites （TFBSs） in non-coding DNA sequences, which is essential to elucidate transcriptional regulatory networks, has emerged as an obstacle that frustrates many researchers. Consequently, numerous motif discovery tools and correlated databases have been applied to solving this problem. However, these existing methods, based on different computational algorithms, show diverse motif prediction efficiency in non-coding DNA sequences. Therefore, understanding the similarities and differences of computational algorithms and enriching the motif discovery literatures are important for users to choose the most appropriate one among the online available tools. Moreover, there still lacks credible criterion to assess motif discovery tools and instructions for researchers to choose the best according to their own projects. Thus integration of the related resources might be a good approach to improve accuracy of the application. Recent studies integrate regulatory motif discovery tools with experimental methods to offer a complementary approach for researchers, and also provide a much-needed model for current researches on transcriptional regulatory networks. Here we present a comparative analysis of regulatory motif discovery tools for TFBSs.

关键词： motif TFBS non-coding DNA sequence computational algorithm motif discovery tool

地铁盾构隧道穿越采空区地面注浆保压技术对地表沉降影响研究

在线全文

学校读者我要写书评

暂无评论

现代城市轨道交通 2024年第9期 82-87页

作者：于洪彪陈熙曹伟杨于广明柴伟于典中交隧道工程局有限公司江苏南京211100 青岛理工大学土木工程学院山东青岛266525

盾构隧道在采空区周围施工时,由于采空区内部结构的特殊性和不稳定性,极易导致围岩失稳。为保证地铁施工期间隧道围岩稳定性以及地表沉降的控制效果,文章针对地铁盾构隧道穿越采空区引起地表沉降过大问题,提出一种注浆保压的采空区提前... 详细信息

盾构隧道在采空区周围施工时,由于采空区内部结构的特殊性和不稳定性,极易导致围岩失稳。为保证地铁施工期间隧道围岩稳定性以及地表沉降的控制效果,文章针对地铁盾构隧道穿越采空区引起地表沉降过大问题,提出一种注浆保压的采空区提前处理工法。依托广州地铁12号线工程,运用FLAC3D数值模拟软件,研究采空区注浆对围岩的支撑能力以及地表沉降控制的影响,并将模拟结果与实际工程数据进行对比分析,验证模拟结果的正确性并总结规律性成果。结果表明,注浆保压控制地表沉降技术在实际应用中具有良好效果,研究成果可对其他盾构隧道穿越采空区地表沉降控制提供参考和借鉴。

关键词：地铁隧道施工采空区注浆保压地表沉降

Virtual network embedding for power savings of servers and switches in elastic data center networks

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2016年第12期59卷 97-110页

作者： weigang HOU Cunqian yu Lei GUO Xuetao wei School of Computer Science and Engineering Northeastern University School of Information Technology University of Cincinnati

Currently, the elastic interconnection has realized the high-rate data transmission among data centers(DCs). Thus, the elastic data center network(EDCN) emerged. In EDCNs, it is essential to achieve the virtual network(VN) embedding, which includes two main components: VM(virtual machine) mapping and VL(virtual link) mapping. In VM mapping, we allocate appropriate servers to hold VMs. While for VL mapping,an optimal substrate path is determined for each virtual lightpath. For the VN embedding in EDCNs, the power efficiency is a significant concern, and some solutions were proposed through sleeping light-duty ***, the increasing communication traffic between VMs leads to a serious energy dissipation problem, since it also consumes a great amount of energy on switches even utilizing the energy-efficient optical transmission technique. In this paper, considering load balancing and power-efficient VN embedding, we formulate the problem and design a novel heuristic for EDCNs, with the objective to achieve the power savings of servers and switches. In our solution, VMs are mapped into a single DC or multiple DCs with the short distance between each other, and the servers in the same cluster or adjacent clusters are preferred to hold VMs. Such that, a large amount of servers and switches will become vacant and can go into sleep mode. Simulation results demonstrate that our method performs well in terms of power savings and load balancing. Compared with benchmarks, the improvement ratio of power efficiency is 5%–13%.

关键词： elastic data center network green virtual network embedding integrated optimization load balancing power efficiency

A Multi-component Decomposition Method for Polarimetric SAR Data

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2017年第1期26卷 205-210页

作者： wei Jujie ZHAO Zheng yu Xiaoping LU Lijun Chinese Academy of Surveying and Mapping Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences

There are more unknowns than equations to solve for previous four-component decomposition methods. So they have to determine each scattering power with some assumptions and avoid negative powers in decomposed results with physical power *** paper presents a multi-component decomposition for multi-look Polarimetric SAR(Pol SAR) data by combining the Generalized similarity parameter(GSP) and the eigenvalue decomposition. It extends the existing fourcomponent decomposition by adding the diffuse scattering as the fifth scattering component considering additional cross-polarized power that could represent terrain effects and rough surface scattering. And unlike the previous methods, the new method determines the volume scattering contribution by a modified nonnegative eigenvalue decomposition method and utilizes the GSP to determine the negative powers of the three scattering contributions(i.e., odd-bounce, double-bounce, and diffuse scattering)directly without extra assumptions and constraints. By experiment, the new method is proved to be more straightforward and reasonable.

关键词： Multi-component decomposition Polarimetric SAR(PolSAR) Generalized similarity parameter(GSP)

K_(3)C_(60)表面量子自旋诱导的YSR多重态和量子相变

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2024年第10期69卷 1392-1399页

作者：王树泽于雪晴韦力瑄王利程强军彭坤程方君刘宇李坊森马旭村薛其坤宋灿立 State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Frontier Science Center for Quantum Information Beijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China Southern University of Science and Technology Shenzhen 518055China

Magnetic impurities in superconductors are of increasing interest due to emergent yu-Shiba-Rusinov(YSR)states and Majorana zero modes for fault-tolerant quantum ***,a direct relationship between the YSR multiple states and magnetic anisotropy splitting of quantum impurity spins remains poorly *** using scanning tunneling microscopy,we systematically resolve individual transition-metal(Fe,Cr,and Ni)impurities induced YSR multiplets as well as their Zeeman effects in the K_(3)C_(60)*** YSR multiplets show identical d orbital-like wave functions that are symmetry-mismatched to the threefold K_(3)C_(60)(111)host surface,breaking point-group symmetries of the spatial distribution of YSR bound states in real ***,we identify an unprecedented fermion-parity-preserving quantum phase transition between ground states with opposite signs of the uniaxial magnetic anisotropy that can be manipulated by an external magnetic *** findings can be readily understood in terms of anisotropy splitting of quantum impurity spins,and thus elucidate the intricate interplay between the magnetic anisotropy and YSR multiplets.

关键词： Magnetic anisotropy YSR multiplets Quantum spin Quantum phase transition Identical wave functions Zeeman effects

多色免疫组织化学技术在肿瘤标志物分析中的研究进展

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

分析化学 2024年第3期52卷 313-322页

作者：杨马骏杨超杰贺月赵灿冀海伟王琦秦玉岭吴丽南通大学公共卫生学院

多色免疫组织化学（Multiplex immunohistochemistry, mIHC）技术是一种新型多靶点病理组织染色、成像及分析技术。该技术通过在单张组织切片上检测多种生物标志物的表达水平及空间分布，实现对细胞的表型、组成、形态及细胞间相互作用... 详细信息

多色免疫组织化学（Multiplex immunohistochemistry, mIHC）技术是一种新型多靶点病理组织染色、成像及分析技术。该技术通过在单张组织切片上检测多种生物标志物的表达水平及空间分布，实现对细胞的表型、组成、形态及细胞间相互作用机理的全面解析。近年来，mIHC技术被成功应用于肿瘤免疫研究领域，为肿瘤的诊断和治疗开辟了新的途径。本文从近年开发的mIHC检测技术出发，针对不同类型mIHC技术的检测原理及其特点进行了详细阐述，重点讨论了新型mIHC检测技术在肿瘤标志物及肿瘤微环境检测等领域中的应用，并对mIHC在肿瘤免疫诊断和治疗领域的应用前景和发展趋势进行了展望。

关键词：多色免疫组织化学荧光多色标记肿瘤诊断循环荧光成像评述

A New Signature Scheme with Shared Verification

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2006年第2期13卷 66-69页

作者： JIA Xiao-yun LUO Shou-shan yuAN Chao-wei School of Continuing Education Beijing University of Posts and Telecommunications Beijing 100876 P.R. China School of Software Engineering Beijing University of Posts and Telecommunications Beijing 100876 P.R. China National Key Laboratory of Integrated Service Networks Xidian University Xi'an 710071 P.R. China

With expanding user demands, digital signature techniques are also being expanded greatly, from single signature and single verification techniques to techniques supporting multi-users. This paper presents a new digital signature scheme with shared verification based on the fiat-shamir signature scheme. This scheme is suitable not only for digital signatures of one public key, but also for situations where multiple public keys are required. In addition, the scheme can resist all kinds of collusion, making it more practicable and safer. Additionally it is more efficient than other schemes.

关键词： digital signature shared verification verifiable secret sharing