A recent application of a simple,all-dry,abrasive transfer of 2D materials on paper demonstrates the potential of two-dimensional tungsten disulfide(WS_(2))as the sensitive material of a flexible photoconductive detec...A recent application of a simple,all-dry,abrasive transfer of 2D materials on paper demonstrates the potential of two-dimensional tungsten disulfide(WS_(2))as the sensitive material of a flexible photoconductive detector.The devices show really good responsivity over a bandwidth spanning from near infrared to ultraviolet and could open new avenues towards disposable optoelectronics systems.展开更多
Not only high spectral efficiency(SE)but also high energy efficiency(EE)are required for future wireless communication systems.Radio orbital angular momentum(OAM)provides a new perspective of mode multiplexing to impr...Not only high spectral efficiency(SE)but also high energy efficiency(EE)are required for future wireless communication systems.Radio orbital angular momentum(OAM)provides a new perspective of mode multiplexing to improve SE.However,there are few studies on the EE performance of OAM mode multiplexing.In this paper,we investigate the SE and EE of a misaligned uniform concentric circle array(UCCA)-based multi-carrier multimode OAM and multiple-input multiple-output(MCMM-OAM-MIMO)system in the line-ofsight(LoS)channel,in which two transceiver architectures implemented by radio frequency(RF)analog synthesis and baseband digital synthesis are considered.The distance and angle of arrival(AoA)estimation are utilized for channel estimation and signal detection,whose training overhead is much less than that of traditional MIMO systems.Simulation results validate that the UCCA-based MCMM-OAM-MIMO system is superior to conventional MIMOOFDM system in the EE and SE performances.展开更多
With reference to sensor node architectures, we consider the problem of supporting forms of memory protection through a hardware/compiler approach that takes advantage of a low-cost protection circuitry inside the mic...With reference to sensor node architectures, we consider the problem of supporting forms of memory protection through a hardware/compiler approach that takes advantage of a low-cost protection circuitry inside the microcontroller, interposed between the processor and the storage devices. Our design effort complies with the stringent limitations existing in these architectures in terms of hardware complexity, available storage and energy consumption. Rather that precluding deliberately harmful programs from producing their effects, our solution is aimed at limiting the spread of programming errors outside the memory scope of the running program. The discussion evaluates the resulting protection environment from a number of salient viewpoints that include the implementation of common protection paradigms, efficiency in the distribution and revocation of access privileges, and the lack of a privileged (kernel) mode.展开更多
In this paper, we present a multi-source nanonetwork model for biomedical diagnosis applications, based on the Localized Surface Plasmon Resonance by different shape gold nanoparticles (i.e., cylinder, cube, and rod)....In this paper, we present a multi-source nanonetwork model for biomedical diagnosis applications, based on the Localized Surface Plasmon Resonance by different shape gold nanoparticles (i.e., cylinder, cube, and rod). We present the process of multi-source emission, diffusion, and reception of nanoparticles, based on the ligand/receptor binding. Then, a multi-detection process of DNA alterations is accomplished when nanoparticles are captured at the receiver. The colloidal particles are selectively functionalized with specific splice junctions of gene sequences to reveal simultaneously different alteration that could be associated to an early disease condition. Particularly, full-wave simulations have been carried out for the multi-detection of alternative splice junctions of breast cancer susceptibility gene 1. The proposed application is verified through numerical results and expressed in terms of Extinction-Cross Section, in the case of synchronous and asynchronous nanoparticles detection. We show that the proposed approach is able to detect DNA alterations, based on a selective nanoparticle reception process.展开更多
With reference to a protection model featuring processes, objects and domains, we consider the salient aspects of the protection problem, domain representation and access right segregation in memory. We propose a solu...With reference to a protection model featuring processes, objects and domains, we consider the salient aspects of the protection problem, domain representation and access right segregation in memory. We propose a solution based on protected references, each consisting of the identifier of an object and the specification of a collection of access rights for this object. The protection system associates an encryption key with each object and each domain. A protected reference for a given object is always part of a domain, and is stored in memory in the ciphertext form that results from application of a double encryption using both the object key and the domain key.展开更多
The aim of this survey paper is to provide the state of the art of the research on control and optimal control of Boolean control networks,under the assumption that all the state variables are accessible and hence ava...The aim of this survey paper is to provide the state of the art of the research on control and optimal control of Boolean control networks,under the assumption that all the state variables are accessible and hence available for feedback.Necessary and sufficient conditions for stabilisability to a limit cycle or to an equilibrium point are given.Additionally,it is shown that when such conditions are satisfied,stabilisation can always be achieved by means of state feedback.Analogous results are obtained for the safe control problem that is investigated for the first time in this survey.Finite and infinite horizon optimal control are subsequently considered,and solution algorithms are provided,based on suitable adaptations of theRiccati difference and algebraic equations.Finally,an appropriate definition of the cost function allows to restate and to solve both stabilisation and safe control as infinite horizon optimal control problems.展开更多
The intelligent information society,which is highly digitized,intelligence inspired,and globally data driven,will be deployed in the next decade.The next 6G wireless communication networks are the key to achieve this ...The intelligent information society,which is highly digitized,intelligence inspired,and globally data driven,will be deployed in the next decade.The next 6G wireless communication networks are the key to achieve this grand blueprint,which is expected to connect everything,provide full dimensional wireless coverage and integrate all functions to support full-vertical applications.Recent research reveals that intelligent reflecting surface(IRS)with wireless environment control capability is a promising technology for 6G networks.Specifically,IRS can intelligently control the wavefront,e.g.,the phase,amplitude,frequency,and even polarization by massive tunable elements,thus achieving fine-grained 3-D passive beamforming.In this paper,we first give a blueprint of the next 6G networks including the vision,typical scenarios,and key performance indicators(KPIs).Then,we provide an overview of IRS including the new signal model,hardware architecture,and competitive advantages in 6G networks.Besides,we discuss the potential application of IRS in the connectivity of 6G networks in detail,including intelligent and controllable wireless environment,ubiquitous connectivity,deep connectivity,and holographic connectivity.At last,we summarize the challenges of IRS application and deployment in 6G networks.As a timely review of IRS,our summary will be of interest to both researchers and practitioners engaging in IRS for 6G networks.展开更多
We study the microscopic origin of magnetism in suspended and dielectrically embedded CrI_(3)monolayer by down-folding minimal generalized Hubbard models from ab initio calculations using the constrained random phase ...We study the microscopic origin of magnetism in suspended and dielectrically embedded CrI_(3)monolayer by down-folding minimal generalized Hubbard models from ab initio calculations using the constrained random phase approximation.These models are capable of describing the formation of localized magnetic moments in CrI_(3)and of reproducing electronic properties of direct ab initio calculations.Utilizing the magnet force theorem,we find a multi-orbital super-exchange mechanism as the origin of magnetism in CrI_(3)resulting from an interplay between ferro-and anti-ferromagnetic Cr-Cr d coupling channels,which is decisively affected by the ligand p orbitals.We show how environmental screening,such as resulting from encapsulation with hexagonal boron nitride,affects the Coulomb interaction in the film and how this controls its magnetic properties.Driven by a non-monotonic interplay between nearest and next-nearest neighbor exchange interactions we find the magnon dispersion and the Curie temperature to be non-trivially affected by the environmental screening.展开更多
We study a nonlinear lossless polarizer(NLP), a fiber-based device able to control the polarization of an optical signal while preserving its energy. The NLP exploits the lossless polarization attraction(LPA) generate...We study a nonlinear lossless polarizer(NLP), a fiber-based device able to control the polarization of an optical signal while preserving its energy. The NLP exploits the lossless polarization attraction(LPA) generated by the Kerr interactions between the signal and a fully polarized continuous wave(CW) pump. By employing a copropagating pump, we show that the effectiveness of LPA depends on the joint action of the Kerr nonlinearity and the mutual delay between signal and pump. We find the optimal pump wavelength placement and demonstrate that true LPA occurs only within a limited range of delay values. Thus, we explain why the copropagating NLP is more flexible and power efficient compared with the traditional counterpropagating NLP.展开更多
基金financial supports from ERC PEP2D (Grant No.770047).
文摘A recent application of a simple,all-dry,abrasive transfer of 2D materials on paper demonstrates the potential of two-dimensional tungsten disulfide(WS_(2))as the sensitive material of a flexible photoconductive detector.The devices show really good responsivity over a bandwidth spanning from near infrared to ultraviolet and could open new avenues towards disposable optoelectronics systems.
基金supported in part by the Fundamental Research Funds for the Central Universitiesthe Innovation Fund of Xidian University。
文摘Not only high spectral efficiency(SE)but also high energy efficiency(EE)are required for future wireless communication systems.Radio orbital angular momentum(OAM)provides a new perspective of mode multiplexing to improve SE.However,there are few studies on the EE performance of OAM mode multiplexing.In this paper,we investigate the SE and EE of a misaligned uniform concentric circle array(UCCA)-based multi-carrier multimode OAM and multiple-input multiple-output(MCMM-OAM-MIMO)system in the line-ofsight(LoS)channel,in which two transceiver architectures implemented by radio frequency(RF)analog synthesis and baseband digital synthesis are considered.The distance and angle of arrival(AoA)estimation are utilized for channel estimation and signal detection,whose training overhead is much less than that of traditional MIMO systems.Simulation results validate that the UCCA-based MCMM-OAM-MIMO system is superior to conventional MIMOOFDM system in the EE and SE performances.
文摘With reference to sensor node architectures, we consider the problem of supporting forms of memory protection through a hardware/compiler approach that takes advantage of a low-cost protection circuitry inside the microcontroller, interposed between the processor and the storage devices. Our design effort complies with the stringent limitations existing in these architectures in terms of hardware complexity, available storage and energy consumption. Rather that precluding deliberately harmful programs from producing their effects, our solution is aimed at limiting the spread of programming errors outside the memory scope of the running program. The discussion evaluates the resulting protection environment from a number of salient viewpoints that include the implementation of common protection paradigms, efficiency in the distribution and revocation of access privileges, and the lack of a privileged (kernel) mode.
文摘In this paper, we present a multi-source nanonetwork model for biomedical diagnosis applications, based on the Localized Surface Plasmon Resonance by different shape gold nanoparticles (i.e., cylinder, cube, and rod). We present the process of multi-source emission, diffusion, and reception of nanoparticles, based on the ligand/receptor binding. Then, a multi-detection process of DNA alterations is accomplished when nanoparticles are captured at the receiver. The colloidal particles are selectively functionalized with specific splice junctions of gene sequences to reveal simultaneously different alteration that could be associated to an early disease condition. Particularly, full-wave simulations have been carried out for the multi-detection of alternative splice junctions of breast cancer susceptibility gene 1. The proposed application is verified through numerical results and expressed in terms of Extinction-Cross Section, in the case of synchronous and asynchronous nanoparticles detection. We show that the proposed approach is able to detect DNA alterations, based on a selective nanoparticle reception process.
文摘With reference to a protection model featuring processes, objects and domains, we consider the salient aspects of the protection problem, domain representation and access right segregation in memory. We propose a solution based on protected references, each consisting of the identifier of an object and the specification of a collection of access rights for this object. The protection system associates an encryption key with each object and each domain. A protected reference for a given object is always part of a domain, and is stored in memory in the ciphertext form that results from application of a double encryption using both the object key and the domain key.
文摘The aim of this survey paper is to provide the state of the art of the research on control and optimal control of Boolean control networks,under the assumption that all the state variables are accessible and hence available for feedback.Necessary and sufficient conditions for stabilisability to a limit cycle or to an equilibrium point are given.Additionally,it is shown that when such conditions are satisfied,stabilisation can always be achieved by means of state feedback.Analogous results are obtained for the safe control problem that is investigated for the first time in this survey.Finite and infinite horizon optimal control are subsequently considered,and solution algorithms are provided,based on suitable adaptations of theRiccati difference and algebraic equations.Finally,an appropriate definition of the cost function allows to restate and to solve both stabilisation and safe control as infinite horizon optimal control problems.
基金This work was supported in part by Open Research Fund of National Mobile Communications Research Laboratory,Southeast University under Grant 2021D04Fundamental Research Funds for the Central Universities,and Innovation Fund of Xidian University.
文摘The intelligent information society,which is highly digitized,intelligence inspired,and globally data driven,will be deployed in the next decade.The next 6G wireless communication networks are the key to achieve this grand blueprint,which is expected to connect everything,provide full dimensional wireless coverage and integrate all functions to support full-vertical applications.Recent research reveals that intelligent reflecting surface(IRS)with wireless environment control capability is a promising technology for 6G networks.Specifically,IRS can intelligently control the wavefront,e.g.,the phase,amplitude,frequency,and even polarization by massive tunable elements,thus achieving fine-grained 3-D passive beamforming.In this paper,we first give a blueprint of the next 6G networks including the vision,typical scenarios,and key performance indicators(KPIs).Then,we provide an overview of IRS including the new signal model,hardware architecture,and competitive advantages in 6G networks.Besides,we discuss the potential application of IRS in the connectivity of 6G networks in detail,including intelligent and controllable wireless environment,ubiquitous connectivity,deep connectivity,and holographic connectivity.At last,we summarize the challenges of IRS application and deployment in 6G networks.As a timely review of IRS,our summary will be of interest to both researchers and practitioners engaging in IRS for 6G networks.
基金We thank M.Kaltak for sharing his cRPA implementation with us.M.I.K.acknowledges support by European Research Council via Synergy Grant 854843—FASTCORRD.S.thanks financial support from EU through the MSCA project Nr.796795 SOT-2DvdW+1 种基金ANR acknowledges partial support from the Russian Science Foundation,Grant No.21-72-10136Part of this work was carried out on the Dutch national e-infrastructure with the support of SURF Cooperative.
文摘We study the microscopic origin of magnetism in suspended and dielectrically embedded CrI_(3)monolayer by down-folding minimal generalized Hubbard models from ab initio calculations using the constrained random phase approximation.These models are capable of describing the formation of localized magnetic moments in CrI_(3)and of reproducing electronic properties of direct ab initio calculations.Utilizing the magnet force theorem,we find a multi-orbital super-exchange mechanism as the origin of magnetism in CrI_(3)resulting from an interplay between ferro-and anti-ferromagnetic Cr-Cr d coupling channels,which is decisively affected by the ligand p orbitals.We show how environmental screening,such as resulting from encapsulation with hexagonal boron nitride,affects the Coulomb interaction in the film and how this controls its magnetic properties.Driven by a non-monotonic interplay between nearest and next-nearest neighbor exchange interactions we find the magnon dispersion and the Curie temperature to be non-trivially affected by the environmental screening.
文摘We study a nonlinear lossless polarizer(NLP), a fiber-based device able to control the polarization of an optical signal while preserving its energy. The NLP exploits the lossless polarization attraction(LPA) generated by the Kerr interactions between the signal and a fully polarized continuous wave(CW) pump. By employing a copropagating pump, we show that the effectiveness of LPA depends on the joint action of the Kerr nonlinearity and the mutual delay between signal and pump. We find the optimal pump wavelength placement and demonstrate that true LPA occurs only within a limited range of delay values. Thus, we explain why the copropagating NLP is more flexible and power efficient compared with the traditional counterpropagating NLP.
