基于Wi-Fi感知的多用户身份识别研究

随着无线感知技术的发展,基于Wi-Fi的身份识别研究在人机交互和家居安防等领域备受关注。尽管基于Wi-Fi信号的身份识别已经取得了初步的成功,但是目前主要适用于用户独立行为场景,并发行为下的多用户身份识别仍然面临着一系列挑战,包括用户之间的相互干扰以及模型鲁棒性差等问题。因此,提出了一种并发行为下多用户身份识别系统Wiblack,其核心思想是训练一个多分支深度神经网络(Wiblack-Net)来提取每个单用户的独特特征。首先,利用主干网络提取多用户之间的共同特征;然后,为每个用户分配一个二分类器以此判断给定群体中是否存在目标用户,在此基础上基于并发行为实现多个用户身份识别。此外,将Wiblack与多个独立的二分类模型和单个多分类模型进行对比实验,对运行效率和系统性能进行分析。实验结果显示,在同时识别3个用户身份时,Wibalck平均准确率达到了92.97%,平均精确度为93.71%,平均召回率为93.24%,平均F1值为92.43%。

一个基于Multi-Agent的统一身份认证系统

针对目前统一身份认证在异构系统上实现困难的问题,结合分布式人工智能的Agent技术,提出了一种基于多Agent的统一身份认证系统,讨论了系统的Agent设计、部署、数据安全性等问题.

Multi-features Based Approach for Moving Shadow Detection

In the video-based surveillance application, moving shadows can affect the correct localization and detection of moving objects. This paper aims to present a method for shadow detection and suppression used for moving visual object detection. The major novelty of the shadow suppression is the integration of several features including photometric invariant color feature, motion edge feature, and spatial feature etc. By modifying process for false shadow detected, the averaging detection rate of moving object reaches above 90% in the test of Hall-Monitor sequence.

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST, also called the Guo Shou Jing Telescope) is a special reflecting Schmidt telescope. LAMOST’s special design allows both a large aperture (effective aperture of 3.6 m–4.9 m) and a wide field of view (FOV) (5°). It has an innovative active reflecting Schmidt configuration which continuously changes the mirror’s surface that adjusts during the observation process and combines thin deformable mirror active optics with segmented active optics. Its primary mirror (6.67m×6.05 m) and active Schmidt mirror (5.74m×4.40 m) are both segmented, and composed of 37 and 24 hexagonal sub-mirrors respectively. By using a parallel controllable fiber positioning technique, the focal surface of 1.75 m in diameter can accommodate 4000 optical fibers. Also, LAMOST has 16 spectrographs with 32 CCD cameras. LAMOST will be the telescope with the highest rate of spectral acquisition. As a national large scientific project, the LAMOST project was formally proposed in 1996, and approved by the Chinese government in 1997. The construction started in 2001, was completed in 2008 and passed the official acceptance in June 2009. The LAMOST pilot survey was started in October 2011 and the spectroscopic survey will launch in September 2012. Up to now, LAMOST has released more than 480 000 spectra of objects. LAMOST will make an important contribution to the study of the large-scale structure of the Universe, structure and evolution of the Galaxy, and cross-identification of multiwaveband properties in celestial objects.

A Comparative Study of Acute Hemodynamic Effects of Multi -site Cardiac Pacing in patients with cardiac function NYHA class ⅠtoⅡ without bundle branch block

Objective To compare the acute hemodynamic effects of five different pacing modes in patients with cardiac function NYHA class Ⅰ to Ⅱ without bundle branch block (BBB). Methods This study included 12 patients (SSS 7, Ⅲ°AVB 5) undergoing pacemaker implantation. Right ventricular apex (RVA), right ventricular outflow tract (RVOT), right ventricular bifocal (RV-Bi), left ventricular base (LVB) and bi -ventricular (Bi-Ⅴ) pacing at 60 -80 ppm were done in VVI mode prior to implantation of DDD pacemaker. The cardiac index (CI), mean pulmonary artery pressure (mPAP) and pulmonary capillary wedge pressure (PCWP) were measured with Swan - Ganz thermodilution catheter after 5 minutes of each pacing mode. Results (1) Comparing to pacing at RVA (CI: 2. 41± 0. 38 L/min per m2, PCWP: 16. 7 ±3.3 mmHg), the CI increased and the PCWP decreased significantly in pacing at RVOT(CI: 2. 63 ± 0.46, PCWP: 13. 8±2. 3), LVB(CI: 2. 78±0.52, PCWP: 14. 4±3.1), RV-Bi(CI: 2. 83±0.57, PCWP: 12. 8± 2. 5) and Bi -Ⅴ pacing (CI: 2. 94± 0.60, PCWP: 12. 7±2. 5), P < 0. 01, respectively. (2) The CI of RV-Bi and Bi-Ⅴ pacing was higher than that of RVOT and LVB pacing, the PCWP was lower, P < 0. 05, respectively. (3) There was no significant difference between RV - Bi pacing and Bi-Ⅴ pacing in CI and PCWP. Conclusion There is no significant difference between RV - Bi pacing and Bi -V pacing in the acute hemodynamic effects; however,dual - site pacing is much better than single site pacing in that aspect for patients with cardiac function NYHA class Ⅰ to Ⅱ without BBB. Among single site pacing, the RVOT and LVB pacing is better than RVA pacing in cardiac function.

Research on A Master - slave Multi - microcomputers Control System for Hollow Spindle Fancy Yarn Spinning Machine

In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardware construction, is introduced. Spinning experiments show that the system achieves satisfactory result. This system can solve the diftkultles of mechatronical fusion between domestic hollow splndk fancy yarn spuming muchine and its microcomputer control technology.

On the Representation of Multi-layer Woven Structure

A quantitative method is developed to identify the structures of multi-layer woven fabric in this study. Six structural parameters are selected to represent the fabric structure. With some design criteria for the reinforcement of textile composites, the relationships among the structural parameters are derived for different binding patterns of the fabric structure. The conditions, which meet the requirements of structural cell stability,are also discussed.

Computer-aided Pattern Design of Multi-bar Warp Knitted Fabrics

To meet the development trend of multi-bar warp knit-ting machine towards high-speed,advanced technologyand computer control and the requirements of variousproducts with small quantity,there are many researcheson the computer-aided pattern design of multi-barwarp knitted fabrics.In terms of the special propertiesof the computer-aided pattern design of multi-barwarp knitted fabrics,the Object Oriented Program(OOP)programming-Object Windows class Library(OWL)programming is selected.According to thecharacters of the OWL programming,various functionsare defined.Pattern design and technical parameters canbe output,which offers a great convenience for the fac-tory.

MODS： A Novel Metaheuristic of Deterministic Swapping for the Multi-Objective Optimization of Combinatorials Problems

This paper states a new metaheuristic based on Deterministic Finite Automata （DFA） for the multi - objective optimization of combinatorial problems. First, a new DFA named Multi - Objective Deterministic Finite Automata （MDFA） is defined. MDFA allows the representation of the feasible solutions space of combinatorial problems. Second, it is defined and implemented a metaheuritic based on MDFA theory. It is named Metaheuristic of Deterministic Swapping （MODS）. MODS is a local search strategy that works using a MDFA. Due to this, MODS never take into account unfeasible solutions. Hence, it is not necessary to verify the problem constraints for a new solution found. Lastly, MODS is tested using well know instances of the Bi-Objective Traveling Salesman Problem （TSP） from TSPLIB. Its results were compared with eight Ant Colony inspired algorithms and two Genetic algorithms taken from the specialized literature. The comparison was made using metrics such as Spacing, Generational Distance, Inverse Generational Distance and No-Dominated Generation Vectors. In every case, the MODS results on the metrics were always better and in some of those cases, the superiority was 100%.

Dynamic Identity Based Authentication Protocol for Two-Server Architecture

Most of the password based authentication protocols make use of the single authentication server for user's authentication. User's verifier information stored on the single server is a main point of susceptibility and remains an attractive target for the attacker. On the other hand, multi-server architecture based authentication protocols make it difficult for the attacker to find out any significant authentication information related to the legitimate users. In 2009, Liao and Wang proposed a dynamic identity based remote user authentication protocol for multi-server environment. However, we found that Liao and Wang's protocol is susceptible to malicious server attack and malicious user attack. This paper presents a novel dynamic identity based authentication protocol for multi-server architecture using smart cards that resolves the aforementioned flaws, while keeping the merits of Liao and Wang's protocol. It uses two-server paradigm by imposing different levels of trust upon the two servers and the user's verifier information is distributed between these two servers known as the service provider server and the control server. The proposed protocol is practical and computational efficient because only nonce, one-way hash function and XOR operations are used in its implementation. It provides a secure method to change the user's password without the server's help. In e-commerce, the number of servers providing the services to the user is usually more than one and hence secure authentication protocols for multi-server environment are required.

Cryptanalysis of a Completely Anonymous Multi-recipient Signcryption Scheme with Public Verification

Anonymity is a very important security objective in network communications.Recently,Pang et al.proposed a novel multirecipient signcryption scheme with complete anonymity and claimed that the new concrete scheme was strong existential unforgeability under selective multi-ID,chosen message attack.Unfortunately,by giving concrete attacks,named " inside attack" and " outside attack" respectively,we indicate that Pang et al.'s scheme is not secure in their security model.

适用于智能家居的格上基于身份多方认证密钥协商协议

随着物联网应用的日益普及,物联网设备终端数量激增、种类多样、层次复杂,常处于不可控的环境之中,因此,确保数据传输过程的安全性和隐私性至关重要。对基于物联网架构的智能家居服务进行探讨得出,启用智能家居应用需涉及多个方面,如用户、云、物联网智能集线器(the IoT smart hub,ISH)和智能设备,它们需要多方验证以进行安全通信。由此提出了一种针对智能家居应用的格上基于身份多方认证密钥协商协议,并证明在eCK模型下是安全的。其安全性可以归约到环上带误差学习(ring learning with errors,RLWE)问题的困难性,能够抗量子计算攻击。所提协议由一个格上基于身份的加密方案转换而成,无须公钥证书,避免了部署一个庞大的公钥基础设施(public key infrastructure,PKI)。通过信息交互实现显式认证,且可具有一定的匿名性质,与其他相关的后量子格上多方认证密钥协商协议方案相比,该协议在安全性和执行效率方面更具优势。

秦汉时期统一多民族国家语境下的“中国”认同

在统一多民族国家的政治环境和“天下一家”语境下,四裔归属意识的不断增强,是秦汉时期的“中国”认同获得空前发展的根本机制。郡县制管理体制机制下东西南北各地、各族居民先后被“编户化”而统称为“秦人”和“汉人”,意味着在秦汉王朝疆域版图之内各族居民在共同的政治、经济、文化政策下,相互认同而实现的空前民族统一,体现出当时东西南北各族对以秦汉王朝为代表的“中国”,在政治、经济、文化等维度下的全方位认同。这是中国古代国家形态、民族内涵及其关系格局发展过程中出现的一次具有里程碑意义的重大转机,这种直接以统一帝国疆域划定的规模空前的统一民族共同体的出现,对于后世中华民族共同体意识的凝聚,具有重要的奠基意义。

大一统历史建构与中华民族共同体的早期凝聚

“大一统”历史观是两汉王朝的官方历史哲学,其核心要义是王权至上基础上的国家统一、天下一家。汉代的主流思想家和历史家出于维护王朝大一统的政治立场,在其历史叙事体系中,建构了纵向圣王一脉相袭,横向华夷共祖同源的“大一统”历史发展演进模式,作为汉朝统一多民族国家共同体确认其文化身份的历史依据,同时建构了华夷同源、“天下一家”、“四海归一”的大一统历史记忆,将华夷各族整合成为一个世代相继、绵延不断的“文化血缘”共同体,籍以与汉朝统一多民族国家大一统政治时局相呼应。通过这样的人为建构,赋予汉帝国绍继周、殷而为新王的正统性与权威性,从而为中华民族共同体的早期孕育,打下了坚实的理论基础,成为中华民族凝聚力的重要精神动力源泉。

民族国家的历史演变及面临的挑战

梳理民族国家形成和演变的历史会发现,民族国家并非某个民族的国家,而是一个取代王朝国家的国家类型,其本质在于民族拥有国家的主权,并通过国家机构来行使。因此,民族国家是一种嵌入了民族因素的国家体制类型,被世界上众多国家采纳,成为世界范围内主导性的国家类型,进而成为“现代国家”概念指称的对象。中国辛亥革命推翻最后一个封建王朝,也以民族国家体制取而代之,并于中华人民共和国成立时完成了民族国家构建。民族国家出现后,一直面临着各种挑战。近年来,欧美国家出现的主观性身份对国民身份产生了侵蚀,对民族国家形成空前严峻的挑战,需要认真关注和深入研究。

身份加密多云多副本完整性审计协议

为解决现有可证明数据持有(PDP)协议只适用于单云存储服务器且过度依赖公钥基础设施的问题,提出一种新的基于身份的多云多副本PDP协议。该协议采用身份加密来简化证书管理,并设计双层默克尔哈希树作为新的安全数据结构,以维护多副本的新鲜性和一致性。安全性分析和实验结果均验证了该协议具备安全性和高效性,能够在多个云存储服务器上实现多副本完整性审计,并在标签生成、证据生成和证据验证3个阶段的效率上明显优于对比算法。

更深刻地理解文化认同是最深层次的认同

文化意涵集“文”(文明程度)与“化”(文明传承)于一体,是国家建设的魂脉。中华民族的文化建设、创新从未间断,中华文化也不断影响、形塑着中华民族,深刻影响到中华民族的国家建设。文化认同深刻影响到对文化主体的认同,对先进文化代表的认同。不断增强各民族对中华文化的认同是中华民族共同体建设的关键所在。

基于多模态信息融合的用户连接方法

为弥补用户连接现有工作中存在的以下两个问题:大部分方法只考虑用户的文本和网络结构信息,忽略了图像等多模态信息;现有方法大都通过简单的特征拼接融合不同模态的信息,忽略了这些信息的互补性、关联性和异质性,提出一个基于多模态信息融合的用户连接模型MIFUIL。获取用户的文本、视觉以及异构网络的嵌入表示;利用注意力机制学习不同模态信息间的互补性、关联性和异质性,获取用户多模态信息的融合嵌入表示,通过多模态对比学习实现跨平台的用户连接。实验结果表明,MIFUIL模型在两个多模态数据集TWFQ、DB-YAGO上的性能均优于现有方法。

节俭式创新中多团队系统跨层次创新机制研究——边界管理者的调节作用

常态化资源紧缺及全球供应链危机下,企业如何利用节俭式创新突破资源约束已引起广泛关注。在嵌入多团队系统协作情境下,对75个单团队和25个多团队系统进行实验研究,基于多团队系统理论和社会身份认同理论,探讨交互记忆系统对单团队和多团队系统节俭式创新的影响,并纳入边界管理者身份认同,探究节俭式创新由单团队向多团队系统跨层次聚合的内在机理。研究表明,交互记忆系统对单团队和多团队系统节俭式创新均发挥重要推动作用;单团队节俭式创新是多团队系统节俭式创新的必要条件;边界管理者的多团队系统成员身份认同度越高,单团队节俭式创新越能够高效聚合为多团队系统的节俭式创新。

基于视觉和惯性传感器的大型邮轮室内旅客身份识别方法

邮轮内部结构及场景复杂,基于监控用单目摄像头的旅客身份识别方法缺乏深度信息,无法准确识别旅客位置、航向及航向变化信息,难以在复杂场景下准确识别旅客身份。针对上述问题,提出了基于监控用单目摄像头与手持惯性传感器的大型邮轮室内旅客身份识别方法。根据YOLOv5视觉目标检测算法,提取监控视频帧中旅客的像素坐标与边界框;利用2D-3D坐标转换公式,将相机图像中旅客的像素坐标转换为物理世界中旅客与相机的相对坐标;再基于改进神经网络模型,估计旅客在相机相对坐标系下的航向角。利用旅客智能手机中惯性传感器,采集旅客运动数据,检测旅客加速度的变化,判别旅客行走状态;融合磁场强度,推算旅客在大地坐标系下的真实航向角;融合提取的视觉和惯性传感器数据,对旅客的有限特征及其关系进行编码,包括瞬时时刻行走状态、步长、相对航向角和相对距离,解决传感器信号的误差累积问题;基于构建的2幅多关联图,提出特征之间的相似度计算公式,再利用视觉与惯性传感器特征图匹配(vision and inertial sensors graph matching,VIGM)算法求解最大相似度矩阵,实现对2幅图中的同一旅客的识别。经长江“黄金3号”邮轮大厅、棋牌室、多功能厅和走廊4个场景实验,可以发现:VIGM算法在1~3 s窗口内平均匹配准确率达83.9%,与使用高成本深度相机的ViTag身份匹配算法相比,平均匹配准确率仅相差4.5%。实验结果表明:所提基于摄像头与惯性传感器的旅客身份识别方法及算法实现成本低,但识别效果与使用高成本深度相机的方法相当。