Centralized security-guaranteed filtering in multirate-sensor fusion under deception attacks

In this paper, the centralized security-guaranteed filtering problem is studied for linear time-invariant stochastic systems with multirate-sensor fusion under deception attacks. The underlying system includes a number of sensor nodes with a centralized filter, where each sensor is allowed to be sampled at different rate. A new measurement output model is proposed to characterize both the multiple rates and the deception attacks. By exploiting the lifting technique, the multi-rate sensor system is cast into a single-rate discrete-time system. With a new concept of security level, the aim of this paper is to design a filter such that the filtering error dynamics achieves the prescribed level of the security under deception attacks. By using the stochastic analysis techniques, sufficient conditions are first derived such that the filtering error system is guaranteed to have the desired security level, and then the filter gain is parameterized by using the semi-definite programme method with certain nonlinear constraints. Finally, a numerical simulation example is provided to demonstrate the feasibility of the proposed filtering scheme.     

Single lithium-ion channel polymer binder for stabilizing sulfur cathodes

Lithium–sulfur batteries have great potential for high-performance energy-storage devices, yet the severe diffusion of soluble polysulfide to electrolyte greatly limits their practical applications. To address the above issues, herein we design and synthesize a novel polymer binder with single lithium-ion channels allowing fast lithium-ion transport while blocking the shuttle of unnecessary polysulfide anions. In situ UV–vis spectroscopy measurements reveal that the prepared polymer binder has effective immobilization to polysulfide intermediates. As expected, the resultant sulfur cathode achieves an excellent specific capacity of 1310 mAh g⁻¹ at 0.2 C, high Coulombic efficiency of 99.5% at 0.5 C after 100 cycles and stable cycling performance for 300 cycles at 1 C (1 C = 1675 mA g⁻¹). This study reports a new avenue to assemble a polymer binder with a single lithium-ion channel for solving the serious problem of energy attenuation of lithium–sulfur batteries.     

中国对虾某些免疫指标的测定及免疫预防初步研究

通过口服免疫药物后，对虾血清中溶菌酶、酚氧化酶（ＰＯ）活力及免疫保护率测定，来作为衡量对虾免疫状态的指标，并用弧菌疫苗浸泡法及口服免疫药物，提高虾体自身免疫能力，增强疾病抵抗力．     

发挥高校工会优势，提高青年教师培养质量

本文针对当前高校中青年教师的发展现状与特点,分析了高校工会在青年教师培养方面存在的问题,结合大连海洋大学工会的青年工作,提出高校工会应在青年教师培养方面有所作为的观点,并进行了有益的实践探索。     

高校羽毛球运动的发展现状与对策探讨

羽毛球运动是一项深受大学生喜爱的体育运动项目,在全国高等院校里非常普及。羽毛球运动在我国高校开展情况到底如何?我们对参加第16届全国大学生羽毛球的高等院校进行了问卷调查,希望通过对目前我国高校羽毛球运动开展的现状进行调查,分析其主客观方面存在的利弊因素,并对羽毛球运动今后在高校开展针对性地提出相关发展策略。     

浙江省科技论文发表情况分析(2011～2013年)

为了解浙江省科研发展情况,本文对Scoups,SCI和中国知网等3个数据库所收录的浙江省的科技论文进行统计分析,研究其在学科,地区和机构等方面的分布情况,希望能为相关的决策工作提供依据。     

影响大学生体育课学习动机因素的调查与分析

采用文献资料、问卷调查、数理统计相结合的研究方法，对影响大学生体育课学习动机的因素进行调查。结果表明：积极因素主要包括增进健康、追求运动带来的振奋感和放松感、调节情绪、希望增加新的学习内容等；消极因素主要是体育学科观念淡薄、体育课教学形式呆板、教师业务水平不高、缺乏场地设施等。     

文化学视野下的中国武术发展

全球化的时代发展趋势和文化的多结构层次内涵特点,是制定中国武术当代发展战略所应当考虑的前提条件。作为中华民族代代相传的一项历史悠久的传统文化遗产,中国武术的当代发展同样也不可避免地面临着文化自身的"时代性"与"民族性"问题。从品牌构建的角度而言,科学的中国武术发展同时也就是中国武术文化品牌的合理化成熟过程,中国武术文化品牌的现实传播应该是一个建立在"传受"双方价值需要都得到相应满足基础之上的"合作过程"。     

一种联合空时分组编码和自适应波束形成的方法

提出一种基于自适应波束形成循环平稳信号算法的STBC系统,首先利用信号的循环平稳性质实现自适应波束形成,然后基于对上行链路感兴趣信号的多个分量的波束形成的估计来构造一对低相关的发送波束,经STBC编码后的即可发送以同时达到分集增益和波束形成增益,并增加下行链路的SNR.提出的方法具有计算简单和快速收敛的性能,可应用于复杂干扰环境下的TDMA无线通信.仿真结果表明这个方法比常规STBC有更好的性能,在误码率为10-4时,可获得5 dB增益.     

学术信息合作查寻行为及其动机剖析

随着Web2.0技术的广泛普及和科学研究任务的复杂性提高,信息查寻领域的单用户范式越来越显示出局限性。基于此,本文阐述了科研工作者合作信息查寻行为研究的基本进展,从个案观察分析法、访谈法、调查统计分析法3个不同视角反映学术信息合作查寻的通用研究方法,并针对研究任务的复杂性、研究任务的创新性、科研工作者的知识结构和认识能力、信息查寻的社会性4个层面,提出了科研工作者合作信息查寻行为发生的动机,讨论了其对信息查寻环境优化、查寻系统构建与改进的影响。

Abstract：

With the wide popularization of Web2.0 technology and the growing complexity of the task for scientific research,the single user paradigm in information seeking field has more and more limitations.Based on this,this paper introduces the basic development of the research on collaborative information seeking behaviors of scientific research personnel.The paper reflects the general research method of academic information collaborative seeking from 3 different perspectives of case observation analysis,interviews,and investigation statistical analysis.The paper puts forward the motivation of scientific research personnel in collaborative information seeking from 4 aspects,that is,the complexity of research task,the innovation of research task,the knowledge structure and cognition capability of scientific research personnel,and the sociality of information seeking.Finally,the paper discusses the influences on the optimization of information seeking environment,and the construction and improvement of the information seeking system.