In radio receivers,complete implementation of the software defined radio(SDR) concept is mainly limited by frontend.Based on bandpass sampling(BPS) theory,a flexible digital frontend(DFE) platform for SDR receiver is ...In radio receivers,complete implementation of the software defined radio(SDR) concept is mainly limited by frontend.Based on bandpass sampling(BPS) theory,a flexible digital frontend(DFE) platform for SDR receiver is designed.In order to increase the processing speed,Gigabit Ethernet was applied in the platform at speed of 5×10~8 bit/s.By appropriate design of interpolant according to the position of input RF signals,multi-band receiving can be realized in the platform with suppression more than 35 d B without changing hardware.展开更多
Large latency of applications will bring revenue loss to cloud infrastructure providers in the cloud data center. The existing controllers of software-defined networking architecture can fetch and process traffic info...Large latency of applications will bring revenue loss to cloud infrastructure providers in the cloud data center. The existing controllers of software-defined networking architecture can fetch and process traffic information in the network. Therefore, the controllers can only optimize the network latency of applications. However, the serving latency of applications is also an important factor in delivered user-experience for arrival requests. Unintelligent request routing will cause large serving latency if arrival requests are allocated to overloaded virtual machines. To deal with the request routing problem, this paper proposes the workload-aware software-defined networking controller architecture. Then, request routing algorithms are proposed to minimize the total round trip time for every type of request by considering the congestion in the network and the workload in virtual machines（VMs）. This paper finally provides the evaluation of the proposed algorithms in a simulated prototype. The simulation results show that the proposed methodology is efficient compared with the existing approaches.展开更多
Over the past few decades, the world has witnessed a rapid growth in mobile and wireless networks（MWNs） which significantly change human life. However, proliferating mobile demands lead to several intractable challe...Over the past few decades, the world has witnessed a rapid growth in mobile and wireless networks（MWNs） which significantly change human life. However, proliferating mobile demands lead to several intractable challenges that MWN has to face. Software-defined network is expected as a promising way for future network and has captured growing attention. Network virtualization is an essential feature in software-defined wireless network（SDWN）, and it brings two new entities, physical networks and virtual networks. Accordingly, efficiently assigning spectrum resource to virtual networks is one of the fundamental problems in SDWN. Directly orienting towards the spectrum resource allocation problem, firstly, the fluctuation features of virtual network requirements in SDWN are researched, and the opportunistic spectrum sharing method is introduced to SDWN. Then, the problem is proved as NP-hardness. After that, a dynamic programming and graph theory based spectrum sharing algorithm is proposed.Simulations demonstrate that the opportunistic spectrum sharing method conspicuously improves the system performance up to around 20%–30% in SDWN, and the proposed algorithm achieves more efficient performance.展开更多
As one of the key elements in various enterprises' core competitiveness,competitive intelligence has universal laws and methods in its managing mode.At the same time,different features lie in different industries,...As one of the key elements in various enterprises' core competitiveness,competitive intelligence has universal laws and methods in its managing mode.At the same time,different features lie in different industries,scales,regions and developing stages.The enterprises must be good at choosing and constructing proper and efficient competitive intelligence modes.In this paper,the author bases his paper on the features of embedded software enterprises - high degree of homogenization and quick upgrade of products,and discusses the basic approaches and process of establishing efficient competitive intelligence in this kind of enterprises.The author hopes his research will provide decision support for those enterprises in strengthening their competitive advantages.展开更多
New energy vehicles(NEVs) are gaining wider acceptance as the transportation sector is developing more environmentally friendly and sustainable technology. To solve problems of complex application scenarios and multi-...New energy vehicles(NEVs) are gaining wider acceptance as the transportation sector is developing more environmentally friendly and sustainable technology. To solve problems of complex application scenarios and multi-sources heterogenous data for new energy vehicles and weak platform scalability,the framework of an intelligent decision support platform is proposed in this paper. The principle of software and hardware system is introduced. Hadoop is adopted as the software system architecture of the platform. Master-standby redundancy and dual-line redundancy ensure the reliability of the hardware system. In addition, the applications on the intelligent decision support platform in usage patterns recognition, energy consumption, battery state of health and battery safety analysis are also described.展开更多
针对传统的IP欺骗攻击缓解方法存在运算开销大、缺乏灵活性等问题,提出了一种基于动态限制策略的软件定义网络(software defined network,SDN)中IP欺骗攻击缓解方法。首先,利用Packet-In消息中三元组信息回溯攻击路径,定位IP欺骗攻击源...针对传统的IP欺骗攻击缓解方法存在运算开销大、缺乏灵活性等问题,提出了一种基于动态限制策略的软件定义网络(software defined network,SDN)中IP欺骗攻击缓解方法。首先,利用Packet-In消息中三元组信息回溯攻击路径,定位IP欺骗攻击源头主机;然后,由控制器制定动态限制策略对连接攻击源头主机的交换机端口的新流转发功能进行限制,待限制期满再恢复其转发新流的功能,限制期的大小随着被检测为攻击源的次数而增长。研究结果表明:这种动态的限制策略可阻隔攻击流进入SDN网络,从而有效避免SDN交换机、控制器以及链路过载;由于在限制期间无需再对这些限制的交换机端口进行实时监测,该方法在应对长时攻击时较传统方法具有更高的缓解效率和更少的资源消耗。展开更多
针对工业物联网中业务需求多样性和服务质量(Quality of Service,QoS)要求差异性导致的网络资源利用低问题,提出一种基于深度强化学习的网络切片资源分配策略。该策略运用深度强化学习优化网络切片资源分配的准入控制,通过智能体在特定...针对工业物联网中业务需求多样性和服务质量(Quality of Service,QoS)要求差异性导致的网络资源利用低问题,提出一种基于深度强化学习的网络切片资源分配策略。该策略运用深度强化学习优化网络切片资源分配的准入控制,通过智能体在特定时间窗口内处理资源请求,并根据不同网络切片的QoS要求及请求准入结果进行资源的动态分配。实验结果表明,所提策略相比基准算法在提高网络收益、资源利用率和接收率方面分别提升了8.33%、9.84%和8.57%。该策略能够在保证服务质量的同时提高整个网络的效率和性能。展开更多
目的为提高医院内骨质疏松性骨折(osteoporotic fracture,OF)患者诊疗质量和管理效率,本研究自主构建一种医院内自动抓取相关资料的“骨质疏松性骨折数据库”,数据库内置管理流程相关的智能化功能模块。在此基础上,分析该数据库在实际...目的为提高医院内骨质疏松性骨折(osteoporotic fracture,OF)患者诊疗质量和管理效率,本研究自主构建一种医院内自动抓取相关资料的“骨质疏松性骨折数据库”,数据库内置管理流程相关的智能化功能模块。在此基础上,分析该数据库在实际场景应用的结果和有效性。方法构建院内封闭式多源异构数据整合的专病数据库,数据库接口可后台对接医院的信息系统(hospital information system,HIS)、影像归档和通信系统(picture archiving and communication systems,PACS)、实验室信息系统(laboratory information system,LIS)等固有数据平台,并自动运用自然语言处理(natural language processing,NLP)技术识别及整合OF患者相关信息。运用该数据库纳入2022年6月至2024年6月苏州大学附属第二医院收治的50岁以上、4部位骨折(椎体、髋部、肱骨近端和桡骨远端)的12754例患者,并对患者信息进行智能化管理应用分析。结果该数据库可按照纳入条件自动获得12754例患者数据,并自动收集患者基本资料、病历或影像检查的骨折记录、检验检查结果、实时治疗方案等407个结构化字段信息。数据库可自动完成患者的骨质疏松相关数据识别(骨折部位、骨密度值、骨代谢相关指标、抗骨质疏松药使用)、院内转科及经治医生追踪、院内多次骨折记录检索。当患者确定纳入管理,数据库可实现本次骨折后2年档案构建、辅助宣教、智能随访、院内门诊电脑同屏显示等智能化管理功能。结论“骨质疏松性骨折数据库”拥有便捷的OF患者信息抓取功能,可实时了解相应管理的基础数据,可自动完成规定时间内设定管理的指导及提醒。该数据库有院内多源异构数据整合的专病数据库特点,为OF精准化、智能化、便捷化管理提供新的思路和有效工具。展开更多
基金Project(2013QNA49)supported by the Fundamental Research Funds for the Central Universities,China
文摘In radio receivers,complete implementation of the software defined radio(SDR) concept is mainly limited by frontend.Based on bandpass sampling(BPS) theory,a flexible digital frontend(DFE) platform for SDR receiver is designed.In order to increase the processing speed,Gigabit Ethernet was applied in the platform at speed of 5×10~8 bit/s.By appropriate design of interpolant according to the position of input RF signals,multi-band receiving can be realized in the platform with suppression more than 35 d B without changing hardware.
基金supported by the National Postdoctoral Science Foundation of China(2014M550068)
文摘Large latency of applications will bring revenue loss to cloud infrastructure providers in the cloud data center. The existing controllers of software-defined networking architecture can fetch and process traffic information in the network. Therefore, the controllers can only optimize the network latency of applications. However, the serving latency of applications is also an important factor in delivered user-experience for arrival requests. Unintelligent request routing will cause large serving latency if arrival requests are allocated to overloaded virtual machines. To deal with the request routing problem, this paper proposes the workload-aware software-defined networking controller architecture. Then, request routing algorithms are proposed to minimize the total round trip time for every type of request by considering the congestion in the network and the workload in virtual machines（VMs）. This paper finally provides the evaluation of the proposed algorithms in a simulated prototype. The simulation results show that the proposed methodology is efficient compared with the existing approaches.
基金supported by the National Natural Science Foundation of China(6102100161133015+4 种基金61171065)the National Natural Science Foundation of China(973 Program)(2013CB329001)the National High Technology ResearchDevelopment Program(863 Program)(2013AA0106052013AA013500)
文摘Over the past few decades, the world has witnessed a rapid growth in mobile and wireless networks（MWNs） which significantly change human life. However, proliferating mobile demands lead to several intractable challenges that MWN has to face. Software-defined network is expected as a promising way for future network and has captured growing attention. Network virtualization is an essential feature in software-defined wireless network（SDWN）, and it brings two new entities, physical networks and virtual networks. Accordingly, efficiently assigning spectrum resource to virtual networks is one of the fundamental problems in SDWN. Directly orienting towards the spectrum resource allocation problem, firstly, the fluctuation features of virtual network requirements in SDWN are researched, and the opportunistic spectrum sharing method is introduced to SDWN. Then, the problem is proved as NP-hardness. After that, a dynamic programming and graph theory based spectrum sharing algorithm is proposed.Simulations demonstrate that the opportunistic spectrum sharing method conspicuously improves the system performance up to around 20%–30% in SDWN, and the proposed algorithm achieves more efficient performance.
文摘As one of the key elements in various enterprises' core competitiveness,competitive intelligence has universal laws and methods in its managing mode.At the same time,different features lie in different industries,scales,regions and developing stages.The enterprises must be good at choosing and constructing proper and efficient competitive intelligence modes.In this paper,the author bases his paper on the features of embedded software enterprises - high degree of homogenization and quick upgrade of products,and discusses the basic approaches and process of establishing efficient competitive intelligence in this kind of enterprises.The author hopes his research will provide decision support for those enterprises in strengthening their competitive advantages.
基金supported by the National Key Research and Development Program of China (2019YFB1600800)。
文摘New energy vehicles(NEVs) are gaining wider acceptance as the transportation sector is developing more environmentally friendly and sustainable technology. To solve problems of complex application scenarios and multi-sources heterogenous data for new energy vehicles and weak platform scalability,the framework of an intelligent decision support platform is proposed in this paper. The principle of software and hardware system is introduced. Hadoop is adopted as the software system architecture of the platform. Master-standby redundancy and dual-line redundancy ensure the reliability of the hardware system. In addition, the applications on the intelligent decision support platform in usage patterns recognition, energy consumption, battery state of health and battery safety analysis are also described.
文摘针对传统的IP欺骗攻击缓解方法存在运算开销大、缺乏灵活性等问题,提出了一种基于动态限制策略的软件定义网络(software defined network,SDN)中IP欺骗攻击缓解方法。首先,利用Packet-In消息中三元组信息回溯攻击路径,定位IP欺骗攻击源头主机;然后,由控制器制定动态限制策略对连接攻击源头主机的交换机端口的新流转发功能进行限制,待限制期满再恢复其转发新流的功能,限制期的大小随着被检测为攻击源的次数而增长。研究结果表明:这种动态的限制策略可阻隔攻击流进入SDN网络,从而有效避免SDN交换机、控制器以及链路过载;由于在限制期间无需再对这些限制的交换机端口进行实时监测,该方法在应对长时攻击时较传统方法具有更高的缓解效率和更少的资源消耗。
文摘针对工业物联网中业务需求多样性和服务质量(Quality of Service,QoS)要求差异性导致的网络资源利用低问题,提出一种基于深度强化学习的网络切片资源分配策略。该策略运用深度强化学习优化网络切片资源分配的准入控制,通过智能体在特定时间窗口内处理资源请求,并根据不同网络切片的QoS要求及请求准入结果进行资源的动态分配。实验结果表明,所提策略相比基准算法在提高网络收益、资源利用率和接收率方面分别提升了8.33%、9.84%和8.57%。该策略能够在保证服务质量的同时提高整个网络的效率和性能。
文摘目的为提高医院内骨质疏松性骨折(osteoporotic fracture,OF)患者诊疗质量和管理效率,本研究自主构建一种医院内自动抓取相关资料的“骨质疏松性骨折数据库”,数据库内置管理流程相关的智能化功能模块。在此基础上,分析该数据库在实际场景应用的结果和有效性。方法构建院内封闭式多源异构数据整合的专病数据库,数据库接口可后台对接医院的信息系统(hospital information system,HIS)、影像归档和通信系统(picture archiving and communication systems,PACS)、实验室信息系统(laboratory information system,LIS)等固有数据平台,并自动运用自然语言处理(natural language processing,NLP)技术识别及整合OF患者相关信息。运用该数据库纳入2022年6月至2024年6月苏州大学附属第二医院收治的50岁以上、4部位骨折(椎体、髋部、肱骨近端和桡骨远端)的12754例患者,并对患者信息进行智能化管理应用分析。结果该数据库可按照纳入条件自动获得12754例患者数据,并自动收集患者基本资料、病历或影像检查的骨折记录、检验检查结果、实时治疗方案等407个结构化字段信息。数据库可自动完成患者的骨质疏松相关数据识别(骨折部位、骨密度值、骨代谢相关指标、抗骨质疏松药使用)、院内转科及经治医生追踪、院内多次骨折记录检索。当患者确定纳入管理,数据库可实现本次骨折后2年档案构建、辅助宣教、智能随访、院内门诊电脑同屏显示等智能化管理功能。结论“骨质疏松性骨折数据库”拥有便捷的OF患者信息抓取功能,可实时了解相应管理的基础数据,可自动完成规定时间内设定管理的指导及提醒。该数据库有院内多源异构数据整合的专病数据库特点,为OF精准化、智能化、便捷化管理提供新的思路和有效工具。
