针对电力语音通信系统架构老化、协议异构、运维割裂等问题,提出基于IP多媒体子系统(IP Multimedia Subsystem,IMS)的语音接入网融合改造方案,构建统一信令控制、媒体处理与服务质量(Quality of Service,QoS)保障体系。设计端到端架构,...针对电力语音通信系统架构老化、协议异构、运维割裂等问题,提出基于IP多媒体子系统(IP Multimedia Subsystem,IMS)的语音接入网融合改造方案,构建统一信令控制、媒体处理与服务质量(Quality of Service,QoS)保障体系。设计端到端架构,完成多协议信令映射、安全与QoS协同机制,实现控制面集中化与接口能力开放。通过构建实验环境开展高并发性能测试,验证系统在会话控制、媒体传输与资源调度方面的提升效果,结果表明改造方案具备工程可行性与部署价值。展开更多
Microglia cells are the resident innate immune cells of the central nervous system(CNS)(Paolicelli et al.,2022).They play a pivotal role in CNS development and in maintaining homeostasis during adulthood.Microglia are...Microglia cells are the resident innate immune cells of the central nervous system(CNS)(Paolicelli et al.,2022).They play a pivotal role in CNS development and in maintaining homeostasis during adulthood.Microglia are being extensively studied for their involvement in CNS disorders,ranging from autoimmune diseases such as multiple sclerosis to neurodegenerative and psychiatric conditions,as well as stroke and brain tumors(Paolicelli et al.,2022).展开更多
电力线通信是构建电力物联网的一种可靠、有效的通信技术,然而电力线信道的广播特性使得其极易成为被窃听对象。为解决电力线信道的安全隐患,文章基于正交频分复用(orthogonal frequency division multiplexing,OFDM)的演进技术即正交...电力线通信是构建电力物联网的一种可靠、有效的通信技术,然而电力线信道的广播特性使得其极易成为被窃听对象。为解决电力线信道的安全隐患,文章基于正交频分复用(orthogonal frequency division multiplexing,OFDM)的演进技术即正交频分复用索引调制(OFDM with index modulation,OFDM-IM)及人工噪声(artificial noise,AN)技术研究了一种OFDM-IM-AN-PLC方案。在多径衰落的电力线信道下,研究了收发两端获得不完整信道状态信息(channel state information,CSI)情形下该方案的误码率性能及安全性能。实验结果证明,即使在收发双方获得不完整CSI情况下,OFDM-IM-AN-PLC方案仍能为电力线信道传输带来安全性。展开更多
本文通过以玉米碴为原料,酿酒酵母、嗜酸乳杆菌、枯草芽孢杆菌及纳豆芽孢杆菌作发酵剂,以单菌和组合的方式对玉米进行发酵制成玉米粉,采用气相-离子迁移谱(Gas-chromatography ion mobility spectrometry,GCIMS)和气相色谱-质谱联用(Gas...本文通过以玉米碴为原料,酿酒酵母、嗜酸乳杆菌、枯草芽孢杆菌及纳豆芽孢杆菌作发酵剂,以单菌和组合的方式对玉米进行发酵制成玉米粉,采用气相-离子迁移谱(Gas-chromatography ion mobility spectrometry,GCIMS)和气相色谱-质谱联用(Gas Chromatography-Mass Spectrometry,GC-MS)方法对发酵玉米粉的挥发性风味成分进行分析。结果表明,GC-IMS共检出68种风味物质,包括醛类12种、醇类18种、酯类11种、酮类11种以及6种杂环类;根据图谱差异分析发现,发酵后玉米粉风味物质均发生变化,其醇类、酯类和酸类物质含量相对提高。GC-MS共检出59种风味物质,包含13种醛类、12种酯类、15种醇类、7种酸类、6种酮类和7种杂环类物质。两种技术共同检测出29种风味物质,其中正癸醛等10种醛类、5种醇类、2-壬酮、2-庚酮、己酸乙酯、甲酸甲酯、丁酸乙酯及4种酸类物质为发酵玉米粉的主要风味物质。根据香气含量分析,对比未发酵玉米粉,自然发酵水果香含量提高了24.64%,酿酒酵母发酵水果香和酒香含量分别提高了30.05%、85.05%,嗜酸乳杆菌发酵水果甜香和奶油蜂蜜香含量分别提高了36.56%、90.36%,枯草芽孢杆菌和纳豆芽孢杆菌发酵水果甜香花及苦杏仁香含量分别提高了18.05%、15.59%和38.68%、38.02%,组合发酵水果甜香花、草香含量分别提高了53.53%、48.08%,表明经过发酵制得的玉米粉风味独特。展开更多
Reliability, maintainability and testability （RMT） are important properties of equipment, since they have important influ- ence on operational availability and life cycle costs （LCC）. There- fore, weighting and op...Reliability, maintainability and testability （RMT） are important properties of equipment, since they have important influ- ence on operational availability and life cycle costs （LCC）. There- fore, weighting and optimizing the three properties are of great significance. A new approach for optimization of RMT parameters is proposed. First of all, the model for the equipment operation pro- cess is established based on the generalized stochastic Petri nets （GSPN） theory. Then, by solving the GSPN model, the quantitative relationship between operational availability and RMT parameters is obtained. Afterwards, taking history data of similar equipment and operation process into consideration, a cost model of design, manufacture and maintenance is developed. Based on operational availability, the cost model and parameters ranges, an optimization model of RMT parameters is built. Finally, the effectiveness and practicability of this approach are validated through an example.展开更多
文摘针对电力语音通信系统架构老化、协议异构、运维割裂等问题,提出基于IP多媒体子系统(IP Multimedia Subsystem,IMS)的语音接入网融合改造方案,构建统一信令控制、媒体处理与服务质量(Quality of Service,QoS)保障体系。设计端到端架构,完成多协议信令映射、安全与QoS协同机制,实现控制面集中化与接口能力开放。通过构建实验环境开展高并发性能测试,验证系统在会话控制、媒体传输与资源调度方面的提升效果,结果表明改造方案具备工程可行性与部署价值。
文摘Microglia cells are the resident innate immune cells of the central nervous system(CNS)(Paolicelli et al.,2022).They play a pivotal role in CNS development and in maintaining homeostasis during adulthood.Microglia are being extensively studied for their involvement in CNS disorders,ranging from autoimmune diseases such as multiple sclerosis to neurodegenerative and psychiatric conditions,as well as stroke and brain tumors(Paolicelli et al.,2022).
文摘电力线通信是构建电力物联网的一种可靠、有效的通信技术,然而电力线信道的广播特性使得其极易成为被窃听对象。为解决电力线信道的安全隐患,文章基于正交频分复用(orthogonal frequency division multiplexing,OFDM)的演进技术即正交频分复用索引调制(OFDM with index modulation,OFDM-IM)及人工噪声(artificial noise,AN)技术研究了一种OFDM-IM-AN-PLC方案。在多径衰落的电力线信道下,研究了收发两端获得不完整信道状态信息(channel state information,CSI)情形下该方案的误码率性能及安全性能。实验结果证明,即使在收发双方获得不完整CSI情况下,OFDM-IM-AN-PLC方案仍能为电力线信道传输带来安全性。
文摘Reliability, maintainability and testability （RMT） are important properties of equipment, since they have important influ- ence on operational availability and life cycle costs （LCC）. There- fore, weighting and optimizing the three properties are of great significance. A new approach for optimization of RMT parameters is proposed. First of all, the model for the equipment operation pro- cess is established based on the generalized stochastic Petri nets （GSPN） theory. Then, by solving the GSPN model, the quantitative relationship between operational availability and RMT parameters is obtained. Afterwards, taking history data of similar equipment and operation process into consideration, a cost model of design, manufacture and maintenance is developed. Based on operational availability, the cost model and parameters ranges, an optimization model of RMT parameters is built. Finally, the effectiveness and practicability of this approach are validated through an example.
