嵌入式微处理器保护方式下高特权级系统调用的研究

设计拥有我国自主版权的微处理器有着重大意义。高特权级系统调用算法及高特权级系统调用测试单元ＰＣＵ是拥有保护机制微处理器的重要组成部分,文中探讨了保护方式下高特权级系统调用的数据结构、定义,给出了高特权级系统调用算法,提出了高特权级系统调用测试单元ＰＣＵ的细胞群结构,并指出细胞是高特权级系统调用测试单元ＰＣＵ的基本测试单位。细胞群结构概念的提出解决了微处理器保护测试单元结构设计的难题,使设计拥有自主     

基于微指令覆盖的最小指令集测试算法

着重讨论了如何利用微处理器中的自测试设计来缩短功能测试序列的长度,首先,依据指令的表示模型,将指令测试分成微指令序列和微指令执行两个测试层次,提出了一个基于微指令覆盖的最小指令集测试算法,只需检测指令集的子集就能达到指令测试的目的。然后,通过定义指令的测试代价和测试效率,提出了一个可以有效地选择最小测试指令集的方法,最后,将算法应用于ＮＲＳ４０００微处理器的功能测试,仅为传统的全指令集测试序列的３     

Correction to: Theoretical prediction of radiation-enhanced diffusion behavior in nickel under self-ion irradiation

Nuclear Science and Techniques - 166.6-MHz quarter-wave $$\beta =1$$ superconducting cavities have been adopted for the High Energy Photon Source, a 6-GeV diffraction-limited synchrotron light...     

多核、多线程处理器的低功耗设计技术研究

随着微处理器设计技术和半导体制造工艺的进步，芯片的规模和复杂度急剧增大，超高的功耗密度对系统稳定性造成很大影响，功耗壁垒已经成为提升微处理器性能的最大障碍。本文介绍了低功耗设计的基本原理、研究内容、设计方法，分析了CMP和SMT体系结构的功耗需求和特性，讨论了不同的功耗优化策略在两种体系结构下的适用程度以及对性能造成的影响。针对多核、多线程体系结构，着重从系统级、结构级和电路级等不同抽象层次对典型的功耗优化技术做了讨论。最后，展望了未来微处理器低功耗设计技术的发展趋势。     

Mechanism of microwave-accelerated soy protein isolate–saccharide graft reactions

To investigate the mechanism of microwave-accelerated soy protein isolate (SPI)–saccharide graft reactions, we examined effects of microwave heating (MH) and water-bath heating (WH) on protein structures and reaction properties. Under high-power microwave irradiation, protein disulfide bonds were broken to cause an increase first and a decrease later in free sulfhydryl contents over time, thus inducing subunit disaggregation. And the solvent (water) exposure of hydrophobic core residues was enhanced in MH-treated SPI, which led to protein disaggregation and unfolding and much smaller aggregates in the protein solution. Calculations showed that graft reactions by MH had much lower activation energies than those by WH. Moreover, microwave can reduce the occurrence of caramelization and thus improve the graft reaction selectivity. It is seen that the microwave radiation power strongly influenced the reaction kinetics. Consequently, the results suggest that improvement of microwave-assisted SPI–saccharide graft reactions is mainly due to a thermal microwave effect and therefore the reaction mechanism could be reasonably inferred.     

面向多智能体协作的注意力意图与交流学习方法

对于部分可观测环境下的多智能体交流协作任务, 现有研究大多只利用了当前时刻的网络隐藏层信息, 限制了信息的来源. 研究如何使用团队奖励训练一组独立的策略以及如何提升独立策略的协同表现, 提出多智能体注意力意图交流算法(Multi-agent attentional intention and communication, MAAIC), 增加了意图信息模块来扩大交流信息的来源, 并且改善了交流模式. 将智能体历史上表现最优的网络作为意图网络, 且从中提取策略意图信息, 按时间顺序保留成一个向量, 最后结合注意力机制推断出更为有效的交流信息. 在星际争霸环境中, 通过实验对比分析, 验证了该算法的有效性.     

快速检测技术在白酒质量检测中的应用现状

白酒是中国特有的蒸馏酒,但近年来,假酒、劣酒引发的食品质量安全事件时有发生。为有效促进白酒质量的提升,保障群众消费安全,有必要对影响白酒质量的常规理化及感官指标、与白酒安全性相关的安全指标和与品质相关的风味指标进行检测,气相色谱技术、高效液相色谱技术等常规检测技术虽然在白酒质量检测中有广泛的应用,但其设备庞大、样品前处理复杂、结果分析相对较慢,在食品监管人员现场执法对食品质量进行快速筛查中受到一定的局限,因此,快速检测技术发挥着重要作用,也有着很大需求。本文综述了毛细管电泳技术、拉曼光谱技术、近红外光谱技术、电子鼻和电子舌快速检测技术在白酒质量检测中的应用现状。不断融入新技术,不断增强方法研究,进一步完善谱库,多种仪器协同发展,是未来快速检测技术在白酒质量检测中的发展方向。     

Calcium phosphate-gold nanoparticles nanocomposite for protein adsorption and mediator-free H2O2 biosensor construction

This work reports a new method for the preparation and application of a kind of biocompatible calcium phosphate-gold nanoparticles (Ca₃(PO₄)₂-AuNPs) nanocomposite. UV-vis spectroscopy and transmittance electron microscopy (TEM) have been used to monitor the formation process of the nanocomposite and to examine the interaction between calcium phosphate and gold nanoparticles (AuNPs). The nanocomposite has multiple sites and improved conductivity which make it suitable for the binding of proteins to construct electrochemical sensors. Myoglobin (Mb) adsorbed on the nanocomposite retained its native structure which was proved by Fourier transform infrared spectroscopy (FTIR). Direct electron transfer between the adsorbed Mb and the electrode was observed. Further results demonstrated that the adsorbed Mb has good electrocatalytic activity towards the reduction of H₂O₂ in the absence of any mediator.     

Te掺杂对SryCo4Sb12-xTex化合物热电性能的影响

采用熔融法结合SPS烧结技术合成了Sr_yCo₄Sb_12-xTe_x化合物, 并探讨了Te掺杂对化合物热电性能的影响. 采用XRD及EPMA确定了相组成及化学成分, 并测试了材料的高温热电性能. 实验结果表明, 虽然Te掺杂降低了Sr在CoSb₃中的填充量, 但是与具有相近Sr填充量的基体相比, Te掺杂提高了材料的载流子浓度和电导率, 同时也提高了塞贝克系数; Te掺杂由于引入了电子-声子散射, 进一步降低了材料的晶格热导率, 并且随着Te掺杂量的增加, 晶格热导率的降低幅度提高; 对x=0.05的样品Sr_0.18Co₄Sb_11.95Te_0.05, 在850K时, 材料的最大ZT值接近1.0, 与具有相近填充量的基体材料相比, ZT值提高了35％.     

A new form of deep learning in smart logistics with IoT environment

The Journal of Supercomputing - The purpose of this study is to introduce a method to fill the gap in urban freight volume prediction in the Internet of Things by utilising deep learning for...