In this paper, the mutual information between clock-controlled input and output sequences is discussed. It is proved that the mutual information is a strictly monotone increasing function of the length of output seque...In this paper, the mutual information between clock-controlled input and output sequences is discussed. It is proved that the mutual information is a strictly monotone increasing function of the length of output sequence, and its divergent rate is gaven.展开更多
This paper presents a new topology to implement Class F power amplifier for eliminating the on-resistance (R_(ON))effect.The time-domain and frequency-domain voltage and current waveforms for Class F amplifier are ana...This paper presents a new topology to implement Class F power amplifier for eliminating the on-resistance (R_(ON))effect.The time-domain and frequency-domain voltage and current waveforms for Class F amplifier are ana- lyzed using Fourier series analysis method.Considering the on-resistance effect,the formulas of the efficiency,output power,dc power dissipation,and fundamental load impedance are given from ideal current and voltage waveforms.For experimental verification,we designed and implemented a Class F power amplifier,which operates at 850 MHz using MGaAs/GaAs Heterostructure FET(HFET)device,and analyzed the measurement results.Test results show that the maximum PAE of 67% can be achieved at 28 dBm output power level.展开更多
为解决数据混合存储导致精准查找速度慢、数据未分类分级管理造成安全治理难等问题,构建基于主从多链的数据分类分级访问控制模型,实现数据的分类分级保障与动态安全访问。首先,构建链上链下混合式可信存储模型,以平衡区块链面临的存储...为解决数据混合存储导致精准查找速度慢、数据未分类分级管理造成安全治理难等问题,构建基于主从多链的数据分类分级访问控制模型,实现数据的分类分级保障与动态安全访问。首先,构建链上链下混合式可信存储模型,以平衡区块链面临的存储瓶颈问题;其次,提出主从多链架构,并设计智能合约,将不同隐私程度的数据自动存储于从链;最后,以基于角色的访问控制为基础,构建基于主从多链与策略分级的访问控制(MCLP-RBAC)机制并给出具体访问控制流程设计。在分级访问控制策略下,所提模型的吞吐量稳定在360 TPS(Transactions Per Second)左右。与BC-BLPM方案相比,发送速率与吞吐量之比达到1∶1,具有一定优越性;与无访问策略相比,内存消耗降低35.29%;与传统单链结构相比,内存消耗平均降低52.03%;与数据全部上链的方案相比,平均存储空间缩小36.32%。实验结果表明,所提模型能有效降低存储负担,实现分级安全访问,具有高扩展性,适用于多分类数据的管理。展开更多
Access control has made a long way from 1960s. With the advent changes of technologies pertaining to location transparency in storage of data, there arises different access control scenarios. Cloud storage, the predom...Access control has made a long way from 1960s. With the advent changes of technologies pertaining to location transparency in storage of data, there arises different access control scenarios. Cloud storage, the predominant storage that is being in use currently, also paves way to various access control problems. Though there are various access control mechanisms such as RBAC, ABAC, they are designed on the user’s perspective such as the role held by the user or other attributes assigned to the user. A new access control mechanism called object relationship based access control (RoBAC) has been developed based on the relations held among the users. The policy decision of access control is based on the relationship among the classes followed in the Java programming. Results have shown that this model best suits various scenarios in the cloud environment, and it also shows that the time for making decision either to allow or to deny is reduced compared to the existing system.展开更多
In this paper the authors study two classes of time-varying nonlinear control systems. A few sufficient conditions of absolute stability of these systems were obtained by means of classical analysis and the analogue o...In this paper the authors study two classes of time-varying nonlinear control systems. A few sufficient conditions of absolute stability of these systems were obtained by means of classical analysis and the analogue of the variation of constants formula of nonlinear systems. Moreover, they gave some sufficient conditions of absolute stability in Hurwitz angle for these systems.展开更多
文摘In this paper, the mutual information between clock-controlled input and output sequences is discussed. It is proved that the mutual information is a strictly monotone increasing function of the length of output sequence, and its divergent rate is gaven.
文摘This paper presents a new topology to implement Class F power amplifier for eliminating the on-resistance (R_(ON))effect.The time-domain and frequency-domain voltage and current waveforms for Class F amplifier are ana- lyzed using Fourier series analysis method.Considering the on-resistance effect,the formulas of the efficiency,output power,dc power dissipation,and fundamental load impedance are given from ideal current and voltage waveforms.For experimental verification,we designed and implemented a Class F power amplifier,which operates at 850 MHz using MGaAs/GaAs Heterostructure FET(HFET)device,and analyzed the measurement results.Test results show that the maximum PAE of 67% can be achieved at 28 dBm output power level.
文摘为解决数据混合存储导致精准查找速度慢、数据未分类分级管理造成安全治理难等问题,构建基于主从多链的数据分类分级访问控制模型,实现数据的分类分级保障与动态安全访问。首先,构建链上链下混合式可信存储模型,以平衡区块链面临的存储瓶颈问题;其次,提出主从多链架构,并设计智能合约,将不同隐私程度的数据自动存储于从链;最后,以基于角色的访问控制为基础,构建基于主从多链与策略分级的访问控制(MCLP-RBAC)机制并给出具体访问控制流程设计。在分级访问控制策略下,所提模型的吞吐量稳定在360 TPS(Transactions Per Second)左右。与BC-BLPM方案相比,发送速率与吞吐量之比达到1∶1,具有一定优越性;与无访问策略相比,内存消耗降低35.29%;与传统单链结构相比,内存消耗平均降低52.03%;与数据全部上链的方案相比,平均存储空间缩小36.32%。实验结果表明,所提模型能有效降低存储负担,实现分级安全访问,具有高扩展性,适用于多分类数据的管理。
文摘Access control has made a long way from 1960s. With the advent changes of technologies pertaining to location transparency in storage of data, there arises different access control scenarios. Cloud storage, the predominant storage that is being in use currently, also paves way to various access control problems. Though there are various access control mechanisms such as RBAC, ABAC, they are designed on the user’s perspective such as the role held by the user or other attributes assigned to the user. A new access control mechanism called object relationship based access control (RoBAC) has been developed based on the relations held among the users. The policy decision of access control is based on the relationship among the classes followed in the Java programming. Results have shown that this model best suits various scenarios in the cloud environment, and it also shows that the time for making decision either to allow or to deny is reduced compared to the existing system.
文摘In this paper the authors study two classes of time-varying nonlinear control systems. A few sufficient conditions of absolute stability of these systems were obtained by means of classical analysis and the analogue of the variation of constants formula of nonlinear systems. Moreover, they gave some sufficient conditions of absolute stability in Hurwitz angle for these systems.
