This paper considers the uplink of a cooperative Code-Division Multiple-Access (CDMA) system where parts of mobile nodes serve as source nodes while the others serve as relay nodes at any instant in time. When the non...This paper considers the uplink of a cooperative Code-Division Multiple-Access (CDMA) system where parts of mobile nodes serve as source nodes while the others serve as relay nodes at any instant in time. When the non-orthogonal spreading codes are adopted,Multiple Access Interference (MAI) will exist at both the relay nodes and the base node,causing diversity gain to diminish. To mitigate MAI and exploit full advantages of cooperation,the Probabilistic Data Association (PDA) is developed at the relay nodes and the base node. Simulation results demonstrate that some performance gains can be obtained by the PDA detector over the Minimum Mean Square Error (MMSE) detector at high Signal-to-Noise Ratio (SNR) and conversely at low SNR.展开更多
The introduction of fillers boosts the performance of polymer coatings and extends their service life.However,single component fillers are not sufficient for intelligent coatings,and compatibility between the polymer ...The introduction of fillers boosts the performance of polymer coatings and extends their service life.However,single component fillers are not sufficient for intelligent coatings,and compatibility between the polymer matrix and the filler remains a major challenge.In this study,functional polydopamine(PDA)modified CeO_(2)/sodium-based montmorillonite(Na-MMT)or CeO_(2)/calcium-based montmorillonite(Ca-MMT)fillers were designed and fabricated via facile in-situ method.The coatings incorporated with MMT-based fillers that were prepared demonstrated remarkable anti-corrosion capabilities,exceptional antimicrobial resistance,and rapid selfhealing properties.Specific ally,the low-frequency impedance(|Z|_(0.01Hz))values of PDA/CeO_(2)/Na-MMT/EP and PDA/CeO_(2)/Ca-MMT/EP,after being immersed for 30 days,were sustained at 2.24×10^(7)and 1.70×10^(7)Ωcm^(2),respectively.Additionally,the bacteriostatic rates of the filler against E.coli and S.aureus can both reach above 99.9%,respectively,due to the photothermal effect and synergistic bacteriostatic mechanism of PDA and CeO_(2).The scratches healed rapidly within 40 s under near-infrared(NIR)irradiation.This work provides valuable guidance for the utilization of MMT-based sheet fillers for enhanced corrosion-resistant,antimicrobial,and repairable coatings.展开更多
目的设计一种生命体征采集系统,实现非联网体征采集设备测量数据的自动识别与记录。方法利用移动手持终端(Personal Digital Assistant,PDA)作为硬件载体,以卷积神经网络算法为基础,结合YOLOv5目标检测算法开发图像识别功能,设计具有图...目的设计一种生命体征采集系统,实现非联网体征采集设备测量数据的自动识别与记录。方法利用移动手持终端(Personal Digital Assistant,PDA)作为硬件载体,以卷积神经网络算法为基础,结合YOLOv5目标检测算法开发图像识别功能,设计具有图像识别能力的生命体征采集系统。通过PDA实现体温、血压、血氧、血糖测量设备体征数据的快速识别,并按照护理管理规则自动记录至医疗系统。结果生命体征采集系统应用后,体征数据采集正确率由99.67%提高至100.00%,次均采集时间缩短29.21%,医护满意度提升5.74%,且差异均有统计学意义(P<0.05)。结论该系统以真实体征数据保障有效诊断,进一步提高了病区护理工作效率,提升了护理质量水平与准确性。展开更多
提出了一种新颖的基于Palm OS的PDA(Personal D ig italA ssistan t,个人数字助理)作物施肥通的设计技术,构建了施肥专家系统的知识表,采用了模块化的编程技术,用C语言编写了基于PDA的作物施肥专家系统程序,并将程序固化在PDA存储器中。...提出了一种新颖的基于Palm OS的PDA(Personal D ig italA ssistan t,个人数字助理)作物施肥通的设计技术,构建了施肥专家系统的知识表,采用了模块化的编程技术,用C语言编写了基于PDA的作物施肥专家系统程序,并将程序固化在PDA存储器中。PDA施肥通内含小麦、玉米、水稻、棉花、油菜和烟草6种大田作物专家系统和一个可扩展的专家系统。它能选择不同的作物、不同的地区,根据土壤中养分的N、P、K或微量元素的含量,建立施肥指导方案,有效地解决了作物种植中科学施肥的问题,使肥料利用率大大提高。通过在农村基层的试验表明:PDA施肥通以其推荐施肥方案合理、体积小、便携性好、价廉和操作简便得到广泛使用。展开更多
针对集约化水产养殖场的养殖面积较大、养殖技术员工作时需要不断移动、养殖远程管理不便等问题,在该实验室对水产养殖饲料配方与投喂技术的研究基础上,分析了饲料投喂的各种影响因素,建立了饲料投喂知识库和数据库,构建了水产养殖饲料...针对集约化水产养殖场的养殖面积较大、养殖技术员工作时需要不断移动、养殖远程管理不便等问题,在该实验室对水产养殖饲料配方与投喂技术的研究基础上,分析了饲料投喂的各种影响因素,建立了饲料投喂知识库和数据库,构建了水产养殖饲料配方模型和饲料投喂决策模型,实现了饲料配方设计、次投喂量、投喂时间、投喂次数的决策以及知识库管理三大功能模块。在Visual Studio 2005环境下,运用C#编写了饲料配方模型和投喂模型,并设计用户界面,采用MsSQL Server 2005 CE管理基础数据,开发了基于PDA的集约化水产养殖饲料投喂决策系统,该系统的建立,不仅提高了水产养殖场的数字化管理水平,而且减少了人力资源成本,也为集约化水产养殖饲料投喂决策提供一种新的实现手段。展开更多
基金Supported by the National Natural Science Foundation of China (No. 60772061)Science Foundation of Nanjing University of Posts and Telecommunications (No. NY207132)the Postdoctoral Research Programs (No. 0801054B)
文摘This paper considers the uplink of a cooperative Code-Division Multiple-Access (CDMA) system where parts of mobile nodes serve as source nodes while the others serve as relay nodes at any instant in time. When the non-orthogonal spreading codes are adopted,Multiple Access Interference (MAI) will exist at both the relay nodes and the base node,causing diversity gain to diminish. To mitigate MAI and exploit full advantages of cooperation,the Probabilistic Data Association (PDA) is developed at the relay nodes and the base node. Simulation results demonstrate that some performance gains can be obtained by the PDA detector over the Minimum Mean Square Error (MMSE) detector at high Signal-to-Noise Ratio (SNR) and conversely at low SNR.
基金financially supported by the National Natural Science Foundation of China(No.52261045)Hainan Provincial Natural Science Foundation of China(No.625QN266)the Scientific Research Starting Foundation of Hainan University(No.XJ2400005319)
文摘The introduction of fillers boosts the performance of polymer coatings and extends their service life.However,single component fillers are not sufficient for intelligent coatings,and compatibility between the polymer matrix and the filler remains a major challenge.In this study,functional polydopamine(PDA)modified CeO_(2)/sodium-based montmorillonite(Na-MMT)or CeO_(2)/calcium-based montmorillonite(Ca-MMT)fillers were designed and fabricated via facile in-situ method.The coatings incorporated with MMT-based fillers that were prepared demonstrated remarkable anti-corrosion capabilities,exceptional antimicrobial resistance,and rapid selfhealing properties.Specific ally,the low-frequency impedance(|Z|_(0.01Hz))values of PDA/CeO_(2)/Na-MMT/EP and PDA/CeO_(2)/Ca-MMT/EP,after being immersed for 30 days,were sustained at 2.24×10^(7)and 1.70×10^(7)Ωcm^(2),respectively.Additionally,the bacteriostatic rates of the filler against E.coli and S.aureus can both reach above 99.9%,respectively,due to the photothermal effect and synergistic bacteriostatic mechanism of PDA and CeO_(2).The scratches healed rapidly within 40 s under near-infrared(NIR)irradiation.This work provides valuable guidance for the utilization of MMT-based sheet fillers for enhanced corrosion-resistant,antimicrobial,and repairable coatings.
文摘目的设计一种生命体征采集系统,实现非联网体征采集设备测量数据的自动识别与记录。方法利用移动手持终端(Personal Digital Assistant,PDA)作为硬件载体,以卷积神经网络算法为基础,结合YOLOv5目标检测算法开发图像识别功能,设计具有图像识别能力的生命体征采集系统。通过PDA实现体温、血压、血氧、血糖测量设备体征数据的快速识别,并按照护理管理规则自动记录至医疗系统。结果生命体征采集系统应用后,体征数据采集正确率由99.67%提高至100.00%,次均采集时间缩短29.21%,医护满意度提升5.74%,且差异均有统计学意义(P<0.05)。结论该系统以真实体征数据保障有效诊断,进一步提高了病区护理工作效率,提升了护理质量水平与准确性。
文摘提出了一种新颖的基于Palm OS的PDA(Personal D ig italA ssistan t,个人数字助理)作物施肥通的设计技术,构建了施肥专家系统的知识表,采用了模块化的编程技术,用C语言编写了基于PDA的作物施肥专家系统程序,并将程序固化在PDA存储器中。PDA施肥通内含小麦、玉米、水稻、棉花、油菜和烟草6种大田作物专家系统和一个可扩展的专家系统。它能选择不同的作物、不同的地区,根据土壤中养分的N、P、K或微量元素的含量,建立施肥指导方案,有效地解决了作物种植中科学施肥的问题,使肥料利用率大大提高。通过在农村基层的试验表明:PDA施肥通以其推荐施肥方案合理、体积小、便携性好、价廉和操作简便得到广泛使用。
文摘针对集约化水产养殖场的养殖面积较大、养殖技术员工作时需要不断移动、养殖远程管理不便等问题,在该实验室对水产养殖饲料配方与投喂技术的研究基础上,分析了饲料投喂的各种影响因素,建立了饲料投喂知识库和数据库,构建了水产养殖饲料配方模型和饲料投喂决策模型,实现了饲料配方设计、次投喂量、投喂时间、投喂次数的决策以及知识库管理三大功能模块。在Visual Studio 2005环境下,运用C#编写了饲料配方模型和投喂模型,并设计用户界面,采用MsSQL Server 2005 CE管理基础数据,开发了基于PDA的集约化水产养殖饲料投喂决策系统,该系统的建立,不仅提高了水产养殖场的数字化管理水平,而且减少了人力资源成本,也为集约化水产养殖饲料投喂决策提供一种新的实现手段。
