Multiple Antenna Technology and Its Application in WiMAX System

Worldwide Interoperability for Microwave Access (WiMAX) technology has rapidly developed in recent years. It is becoming one of the hotspots among broadband wireless access technologies. A WiMAX system can provide bandwidth efficiency higher than 2 bps/Hz. In order to improve coverage and reliability of the WiMAX system,the IEEE 802.16 standard supports multiple antenna techniques such as Alamouti Space-Time Coding (STC),Adaptive Antenna System (AAS) and Multiple Input Multiple Output (MIMO). The applications of the multiple antenna techniques improve system capacity and bandwidth efficiency significantly,and enhance the competence of the WiMAX technology greatly.

Application of New Concept for Multiple Intelligences Calculation for Personality and Social Groups Comparison Research

A person is considered as information-energy system with a host of feedbacks. The possibility of determining the statistical characteristics in a multiple intelligences profile of various social groups’ representatives using the vibraimage technology is investigated. Theft and alcohol abuse have been chosen as examples of significant social problems including deviant behavior and the trigger of formation of various socially vulnerable groups. The comparative analysis of conscious and unconscious attitudes in multiple intelligences structure of individuals prone to deviant behavior and the control group allows differentiating professional preferences and the impact of society on different social groups.

Flexibility of MIP Technology

The flexibility of MIP technology to meet market demand is mainly introduced in this study. Their commercial application and technical principle are analyzed too. The MIP technology with wide feed adaptability can form a good combination with other technologies. The MIP technology has been applied extensively in China. Based on this platform, the CGP, MIP-LTG and MIP-DCR technologies have been developed, which can further improve the flexibility of MIP technology. Based on its novel reaction control technique with a sole sequential two-zone riser, the MIP users can easily switch to different operating modes between producing either more clean gasoline and propylene or diesel through changing the catalysts and varying the operating conditions. That offers MIP users with enough production flexibility and a rational production arrangement to meet the market demand. The MIP-DCR technology with less dry gas and coke yields can provide a more flexible operating mode since the catalysts to oil ratio has become an independent variable.

Using Vibraimage Technology to Analyze the Psychophysiological State of a Person during Opposite Stimuli Presentation

The vibraimage technology is applied to evaluate the multiple intelligences by presenting the line-opposite stimuli. The analysis of testing results of 161 and 91 first-year students from two technical universities, St. Petersburg, Russia, is presented. A new method has been introduced for the assessment of the level of introversion and extraversion of a person being tested. Various equations for calculating the psychophysiological state have been studied and common patterns of the psychophysiological responses to the stimuli were revealed. The experiments showed a prevailing negative correlation between the parameters of a person’s energy consumption and information exchange detected by the vibraimage technology. The article discusses the possibility of extending the obtained results to other psychophysiological tests.

Modeling and gender difference analysis of acceptance of autonomous driving technology

In order to deeply analyze the differences in the acceptance of autonomous driving technology among different gender groups,a multiple indicators and multiple causes model was constructed by integrating a technology acceptance model and theory of planned behavior to comprehensively reveal the gender differences in the influence mechanisms of subjective and objective factors.The analysis is based on data collected from Chinese urban residents.Among objective factors,age has a significant negative impact on women's perceived behavior control and a significant positive impact on perceived ease of use.Education has a significant positive impact on men's perceived behavior control,and has a strong positive impact on women's perceived usefulness(PU).For men,income and education are found to have strong positive impacts on perceived behavior control.Among subjective factors,perceived ease of use(PEU)has the greatest influence on women's behavior intention,and it is the only influential factor for women's intention to use autonomous driving technology,with an influence coefficient of 0.72.The influencing path of men's intention to use autonomous driving technology is more complex.It is not only directly affected by the significant and positive joint effects of attitude and PU,but also indirectly affected by perceived behavior controls,subjective norms,and PEU.

Research on the Properties of a Surface-Type Infrared Decoy and Effect of Multiple Launching

To study the properties of a new surface-type infrared decoy,the numerical dispersion model and the infrared radiance model of the plates are established. In addition,the temperature of a single plate was measured during combustion experiment,and the spatial position and infrared radiance of each plate are calculated in plate cloud by the two models respectively. Furthermore,the radar images of the plate cloud are simulated and analyzed in dependence of time and direction for single and multiple launching. The result shows that the surface-type infrared decoy can be a point source of interference when the missile is remote tracking. In the meanwhile,the plates cloud shelters the infrared characteristics of the plume and jets of aircraft when the missile is on IR imaging guidance mode. Moreover,With the analysis of the plate cloud dispersion at different intervals and the infrared radiation intensity in the case of different launching number,it can be concluded that a comfortable launching interval can maintain a continuous plate cloud,launching the decoys simultaneously increase the increment of the radiation intensity obviously,the multiple launching is an effective way to enhance the interference property of the decoy.

Underwater Localization for Multiple AUVs Based on Bearing and Range Measurements

A novel underwater localization algorithm for autonomous underwater vehicle(AUVs) is proposed. Taking aim at the high cost of the traditional "leader-follower" positioning,a "parallel" model is adopted to describe the localization problem. Under an unknown-but-bounded assumption for sensor noise,bearing and range measurements can be modeled as linear constraints on the configuration space of the AUVs. Merged these constraints,a convex polyhedron representing the set of all configurations consistent with the sensor measurements can be induced. Estimates for the uncertainty in the position of a single AUV or the relative positions of two or more AUVs can then be obtained by projecting this polyhedron into appropriate subspaces of the configuration space. The localization uncertain region for each AUV can be recovered by an approximation algorithm to realize underwater localization for multiple AUVs. The deduced theoretically and the simulated results show that it is an economical and practical localization method for the AUV swarm.

Research on the Multi-Interactive Intelligent Teaching Model of College English in the Information Technology Environment

The multi-interactive teaching mode based on the information technology is a new teaching mode, which promotes students' autonomous learning and research-oriented learning through the online and offline effective interaction in and out of class, fully embodying the principle of the learning-orientation. Based on this, this paper focuses on the connotation and the theoretical basis o f the multi-interactive teaching model, as well as its implementation practices and characteristics, with a view o f providing help to improve the quality of the college English teaching.

High-uniformity 2×64 silicon avalanche photodiode arrays with silicon multiple epitaxy technology

In this paper,high-uniformity 2×64 silicon avalanche photodiode[APD]arrays are reported.Silicon multiple epitaxy technology was used,and the high performance APD arrays based on double-layer epiwafers are achieved for the first time,to the best of our knowledge.A high-uniformity breakdown voltage with a fluctuation of smaller than 3.5 V is obtained for the fabricated APD arrays.The dark currents are below 90 pA for all 128 pixels at unity gain voltage.The pixels in the APD arrays show a gain factor of larger than 300 and a peak responsivity of 0.53 A/W@M=1 at 850 nm[corresponding to maximum external quantum efficiency of 81%]at room temperature.Quick optical pulse response time was measured,and a corresponding cutoff frequency up to 100 MHz was obtained.

支撑新能源电力系统灵活性需求的用户侧资源应用与关键技术

伴随着传统电力系统向以新能源为主体的新型电力系统转型升级,高比例新能源的接入和传统机组占比下降导致电力系统灵活性产生缺额。电动汽车、数据中心、P2X(power-to-X)等需求侧资源可以在多时间尺度为电力系统提供灵活性,是新型电力系统灵活性的重要组成部分。该文首先描述高比例新能源背景下输电网和配电网在不同时间尺度的灵活性需求,然后对比总结了典型需求侧资源的调节特性与应用实践,研究了需求侧资源在支撑高比例新能源输电网和配电网中运行、规划2个层面多时间尺度灵活性需求的应用场景。最后针对未来需求侧资源的研究重点,从聚合技术、电碳协同优化调控策略、可信调节能力量化和通信与信息交换标准等角度,对支撑新型电力系统需求侧资源应用的关键技术进行了总结与展望。

数智创新生态系统中知识生成的动力螺旋与协同演化

[目的/意义]数智技术的迅猛发展为赋能创新生态系统提供了更多可能性,推动了社会原有生产模式的变革。研究数智创新生态系统知识生成动力,分析数智技术赋能下创新生态系统知识生成的特征和协同演化过程,具有重要的现实意义。[方法/过程]结合知识链理论,对数智创新生态系统知识生成的内涵和特征进行阐述;分析数智创新生态系统知识生成多螺旋的演变动因,并构建知识生成多螺旋模型;采用协同学理论,对创新生态系统知识生成动力多螺旋模型的演化进行分析。[结果/结论]在数智技术的参与下,创新生态系统知识生成表现出新的特征;人类螺旋和非人类螺旋的演化经历了局部人机协作、人机协同和人智融合三个阶段。

多发伤患者早期肠道菌群及其代谢产物氧化三甲胺的变化

目的:多发伤患者一旦并发脓毒症和多器官功能障碍综合征则预后不良。本研究通过观察多发伤患者早期肠道菌群及其代谢产物氧化三甲胺的变化,探讨多发伤患者并发脓毒症和多器官功能障碍综合征的可能机制。方法:选取2023年4月至9月江苏大学附属医院收治的符合纳入标准的多发伤患者25例作为多发伤组,选取同期本院体检中心符合纳入标准的健康志愿者25例作为对照组。收集多发伤组伤后1周左右的粪便标本和血浆标本,同期收集对照组体检当天的粪便标本和血浆标本。通过16S rRNA高通量测序技术检测粪便标本,分析多发伤组和对照组肠道菌群的差异。采用高效液相色谱-质谱串联技术检测血浆标本,分析多发伤组和对照组血浆氧化三甲胺水平的差异。结果:多发伤组和对照组的肠道菌群构成存在明显差异。在菌门水平上,多发伤组变形菌门的相对丰度明显高于对照组(P<0.05);厚壁菌门和拟杆菌门的相对丰度明显低于对照组(P<0.05)。在菌属水平上,多发伤组大肠埃希菌属、致病肠球菌属、梭菌属、考拉杆菌属的相对丰度均明显高于对照组(均P<0.05),普氏菌属、双歧杆菌属、瘤胃菌属、乳杆菌属、粪球菌属、布劳特菌属、丁酸弧菌属的相对丰度均明显低于对照组(均P<0.05)。多发伤组血浆氧化三甲胺水平明显高于对照组(P<0.05)。结论:与健康人群相比,多发伤患者早期肠道菌群已发生变化,专性厌氧菌相对丰度下降,兼性厌氧菌相对丰度上升,有益共生菌相对丰度减少,机会致病菌相对丰度增加,这可能与多发伤患者并发脓毒症有关。血浆氧化三甲胺的水平升高可能与肠道菌群的变化和多发伤患者并发多器官功能障碍综合征有关。

多源参考数据下的边坡DEM提取与精度分析

参考DEM是InSAR DEM提取精度分析中不可或缺的重要数据。考虑到当前可供使用的DEM数据层出不穷,如何选择可靠的参考DEM以解决不同地形DEM提取精度的需求,是DEM提取中一个亟待解决的问题。本文分别选择12.5 m的ALOS DEM、30 m的STRM DEM、90 m的STRM DEM作为参考DEM,依据2020年两景Sentinel-1A影像对德兴市部分地区边坡进行DEM数据提取,利用InSAR技术提取实验区的S1ADEM数据,并以ASTGTM DEM数据为参考,使用检测点法随机选择约300个检测点,选择相应的评价指标,分别对不同参考DEM下提取得到的S1ADEM进行精度检验。研究结果显示,使用12.5 m分辨率的ALOS DEM作为外部DEM,提取得到的S1ADEM精度更高,其在实验区A的RMSE为9.412 m,使用90 m的STRM DEM,提取得到的S1ADEM精度更低,其在实验区A的RMSE为10.293m。该实验为不同地形提取DEM提供了指导,能够帮助学者们在进行InSAR实验时更好地选择参考DEM,研究成果可为边坡灾害及预警提供重要的技术支持。

IRS辅助上行NOMA和速率最大化方案

针对非正交多址接入(non-orthogonal multiple access,NOMA)系统在无线环境下传输速率较低的问题,利用智能反射面(intelligent reflecting surface,IRS)可以改变入射信号相移的特性,提出一种基于IRS辅助上行NOMA和速率最大化算法.首先,在满足每个用户功率、每个用户最小速率、IRS相位偏移的约束条件下,构建一个联合用户功率、IRS相移多变量优化模型;然后,通过问题公式的等效简化将原非凸问题转换为2个容易处理的子问题;最后,通过交替方向乘子法(alternating direction method of multipliers,ADMM)、引入松弛变量等方法对子问题进行求解.仿真结果表明,相较于逐次凸逼近法(successiveconvexapproximation,SCA)所提出的算法平均提升了系统0.4 bit/(s·Hz)的和速率,证明了基于ADMM的算法有效提高系统的和速率.

科技创新新型举国体制下多元投资主体网络关联模式

科技创新新型举国体制是应对错综复杂国际环境和全面建成社会主义现代化强国使命任务的重大制度安排,厘清科技创新新型举国体制的多元投资主体关系对于推动有为政府与有效市场相结合具有重要意义。本文在分析科技创新新型举国体制的制度创新基础上,归纳不同实践场景下多元投资主体的基本格局,利用社会网络分析的网络拓扑结构、中心性、核心边缘分析和密度分析手段,对多元投资主体的网络结构、网络中心度以及网络的整体特征进行研究。结果表明,科技创新新型举国体制能充分调动市场与社会力量,各投资主体之间的信息、资源等流动加快,各投资主体间的联系更加紧密,企业在科技创新新型举国体制中将发挥更重要的作用。

基于GPRS无线通讯技术的自动化灌溉系统设计

针对传统的大水漫灌等灌溉方式灌水不均、容易造成农作物病害或涝死、浪费水资源和人工成本较高的问题,基于GPRS无线通讯技术对自动化灌溉系统进行了设计。为了获取有效的灌溉数据,同时能够对数据进行统计、分析和预测,设计了自动灌溉数据信息的预处理方法,并采用多元线性回归预测模型对灌溉数据进行预测。为了验证该自动化灌溉系统的性能,对其进行了数据采集试验和灌溉预测试验,结果表明:系统对灌溉数据监测和预测的准确率均较高。

“一村多名大学生计划”蔬菜生产技术课程的改革与启迪——以黄冈职业技术学院为例

以黄冈职业技术学院“一村多名大学生计划”现代农业技术专业核心课程蔬菜生产技术为例,根据“一村多名大学生”知识背景和岗位需求,在充分调研的基础上进行学情分析,认为新形势下传统的教学方法不利于学生对专业知识和技能的掌握,也难以实现乡村人才培养的目标,提出从课程教学内容与教学模式、教学方法、考核评价等方面进行改革及实践探索,其预期结果可为其他院校“一村多名大学生”和普通高职生的课程教学改革提供参考,以提高教学效果,保障人才培养质量。

“多元基础、分路径培养”的物流大数据应用型人才培养创新与实践

该文从人才培养模式创新、产教融合提升人才培养质量视角,对大数据本科专业应用型人才培养的多元学科专业基础和培养路径做出分析,进而以物流大数据专业群应用型人才培养为例,通过实施文理文工融合改革思路构建物流大数据复合知识体系,建设“多专业+多课程+多层次+多要求”的大数据实践实训平台、多学科专业融合互促的泛在化教学体系和深化产教研融合,形成多元基础分路径培养的人才培养思路并应用实践。通过物流大数据人才培养改革创新与实践,2021—2023年文理文工融合人才培养模式获得认可,教学成果突出,促进学科专业资源整合,形成“资源-名师-成果”互促上升的发展路径,人才培养质量显著提升,社会认可度提高。

基于O2O混合教学模式的研究与探索——以“高频电子技术”课程为例

“高频电子技术”课程涉及的电路原理、参数及公式冗余枯燥,加之课时压缩,学习难度大,导致学生在学习过程中缺乏独立思考能力,知识面断层现象较为严重。因此,随着社会的发展需求不断上升以及知识技能的更新迭代等,对大学生能力素质要求越来越高,传统的课堂教学模式已不能满足大学生的培养需求。针对上述问题,文章提出了一种基于线上线下O2O混合式教学模式并付诸实施,教学效果得到改善。该混合式教学结合“高频电子技术”的课程特点,将波形仿真及实践电路有效地融入理论课程,使理论分析与实践应用相辅相成,并结合理论辅导答疑、组织讨论、交流互动等环节,有效地解决了理论上的冗余性、实践的匮乏性等问题,达到了多元一体化的教学效果,使学习体验由“学无所用”转变为“学有所用”,具有一定的推广价值。