超临界二氧化碳富集提纯鱼油中EPA和DHA的研究进展（Ⅱ）鱼油的预处理和实验装置

综述了近年来人们用超临界二氧化碳（ＳＣ－ＣＯ_２）从鱼油中富集提纯ＥＰＡ（廿碳五烯酸）和ＤＨＡ（廿二碳六烯酸）的各类实验装置。讨论了鱼油的预处理方法、萃取操作条件对ＳＣ－ＣＯ_２提纯ＥＰＡ和ＤＨＡ的纯度和收率的影响。介绍了一个工业化双塔连续逆流萃取模拟流程。对我国鱼油资源的利用进行了分析。     

The Impacts of an Electronic Marketplace with Multiple Independent Retailers for Smart Grocery Ordering Systems

This study investigates the impacts of an electronic marketplace with multiple independent retailers for a smart grocery ordering system. Apart from replenishing products from suppliers, the system can also purchase/sell products from/to the electronic marketplace through ‘spot shops’. Both static and dynamic pricing models for the electronic marketplace are developed. An extensive numerical experiment is conducted and the results show that under both static and dynamic pricing, (i) the inventory cost of the aggregated supply chain is significantly reduced; (ii) each participant also enjoys significant cost savings from employing the electronic marketplace. Furthermore, the cost savings increase as the lead times from suppliers increase and/or the variability of their demands increases. The participants’ cost savings also increase as more participants employ the electronic marketplace.     

位相调制三倍频激光束聚焦特性的衍射模型

基于三次谐波转换过程中位相扰动的传输变换 ,理论上研究了非线性晶体表面周期性纹波对三倍频激光束聚焦特性的影响 ,建立了多级衍射模型。该理论模型能解析地分析多级衍射峰的强度分布及角度分布 ,可为高功率激光驱动器三倍频器的设计提供理论依据     

物联网在智能心电监护上的应用

提出将物联网与传统心电Holter仪相结合,特点是:(1)利用家庭末梢网络,将心电Holter仪接入Internet;(2)使用心电数据中心为心电Holter仪提供网络存储功能;(3)采用符合HL7标准的消息结构,实现机器对内容的自动处理。物联网在智能心电监护上的应用能够大大提高用户体验和救治效率,有助于医疗技术发展。     

Coexistence of multiple bifurcation modes in memristive diode-bridge-based canonical Chua’s circuit

Based on a memristive diode bridge cascaded with series resistor and inductor filter, a modified memristive canonical Chua’s circuit is presented in this paper. With the modelling of the memristive circuit, a normalised system model is built. Stability analyses of the equilibrium points are performed and bifurcation behaviours are investigated by numerical simulations and hardware experiments. Most extraordinary in the memristive circuit is that within a parameter region, coexisting phenomenon of multiple bifurcation modes is emerged under six sets of different initial values, resulting in the coexistence of four sets of topologically different and disconnected attractors. These coexisting attractors are easily captured by repeatedly switching on and off the circuit power supplies, which well verify the numerical simulations.     

探析移动互联网生态系统中运营商的发展策略

从移动互联网的本质出发,在探讨当前移动互联网生态系统的基础上,进一步分析了运营商的优劣势,并提出了相关发展策略建议。     

复数域网络编码中最大似然解码算法的改进

针对复数域网络编码中继网络,提出一种改进的中继处的最大似然解码算法。当传统的最大似然解码算法使用在复数域网络编码中继网络中时,计算复杂度会随着信息星座图映射方式的改变而大大增加。为了降低计算复杂度,在前人研究的基础上提出一种改进的最大似然解码算法,该算法利用无线中继网络通信系统的非对称性,在解码时,先进行预判决,然后进行精确判决,这样可以大大降低计算复杂度,提高了系统性能。     

OFDMA Femtocell网络中混合接入方式下的资源分配策略

Femtocell(飞小区)能够有效加强室内覆盖和系统容量。混合接入(hybrid access)方式可以兼顾授权用户和非授权用户的业务体验。针对下行混合接入方式下的正交频分复用接入(OFDMA) Femtocell网络,该文提出带权重的比例公平(WPF)调度算法,为不同类型的用户提供不同的调度权重。该文提出两种算法确定用户的调度权重,一种是自适应权重的比例公平算法,实时调整调度权重;另一种是静态权重的比例公平算法,基于WPF调度的渐近性分析得到静态最优调度权重。仿真结果表明该文提出的两种算法均能在授权用户和非授权用户间合理分配资源,保证不同用户的速率需求。     

辫群上新的签名体制

 辫群是构造抗量子攻击密码协议的新平台。该文基于辫群上求根问题的难解性提出了新的签名体制,并证明其在随机预言模型下能抵抗适应性选择消息的存在性伪造攻击。新体制在签名验证阶段不需要判断辫元是否存在共轭关系,计算效率比共轭签名体制、改进共轭签名体制更高;签名由一个整数和一个辫元组成,与共轭签名体制相比长度更短,与改进共轭签名体制长度相当。