1.arise(arose,arisen)vi.发生,出现。arise from 是“由……而引起”。例如:The buyer should contact the sellers as soon as possible when a claimon quality arises.当发生质量索赔时,买方应尽早同卖方联系。You must be responsi...1.arise(arose,arisen)vi.发生,出现。arise from 是“由……而引起”。例如:The buyer should contact the sellers as soon as possible when a claimon quality arises.当发生质量索赔时,买方应尽早同卖方联系。You must be responsible for all the losses arising from your delay inopening the covering L/C.你方必须对由于迟开信用证而造成的一切损失负责。展开更多
子宫腺肌病是妇科常见的良性疾病,多见于30~50岁。随着对子宫腺肌病研究的不断深入,子宫腺肌病恶变(endometrial cancer arising in adenomyosis,EC-AIA)受到重视。EC-AIA患病率低,多为病例报道,但EC-AIA仍是威胁女性健康的临床问题,重...子宫腺肌病是妇科常见的良性疾病,多见于30~50岁。随着对子宫腺肌病研究的不断深入,子宫腺肌病恶变(endometrial cancer arising in adenomyosis,EC-AIA)受到重视。EC-AIA患病率低,多为病例报道,但EC-AIA仍是威胁女性健康的临床问题,重要的是EC-AIA没有特异性症状和有效辅助检查手段,临床诊断困难,不易早期发现且容易漏诊、误诊和延迟诊断,需要不断总结再认识。展开更多
This paper considers a multi-antenna ac-cess point(AP)transmitting secrecy message to a single-antenna user in the presence of a single-antenna illegal eavesdropper(Eve)and proposes a double ac-tive reconfigurable int...This paper considers a multi-antenna ac-cess point(AP)transmitting secrecy message to a single-antenna user in the presence of a single-antenna illegal eavesdropper(Eve)and proposes a double ac-tive reconfigurable intelligent surfaces(DARISs)as-sisted physical layer security(PLS)scheme denoted by DARISs-PLS to protect the secrecy message trans-mission.We formulate a secrecy rate maximization problem for the proposed DARISs-PLS scheme by considering a power budget constraint for the two ac-tive reconfigurable intelligent surfaces(ARISs)and AP.To address the formulated optimization problem,we jointly optimize the reflecting coefficients for the two ARISs and the beamforming at the AP in an it-erative manner by applying Dinkelbach based alter-nating optimization(AO)algorithm and a customized iterative algorithm together with the semidefinite re-laxation(SDR).Numerical results reveal that the pro-posed DARISs-PLS scheme outperforms the dou-ble passive reconfigurable intelligent surfaces-assisted PLS method(DPRISs-PLS)and single ARIS-assisted PLS method(SARIS-PLS)in terms of the secrecy rate.展开更多
This paper explores a UAV-mounted active Reconfigurable Intelligent Surface(aRIS)network designed to enhance secure downlink communication for multiple users while mitigating the impact of multiple Eavesdroppers(EVs)....This paper explores a UAV-mounted active Reconfigurable Intelligent Surface(aRIS)network designed to enhance secure downlink communication for multiple users while mitigating the impact of multiple Eavesdroppers(EVs).The focus is on optimizing the UAV’s trajectory,the Base Station’s(BS)transmit beamforming,and the power-Amplified Programmable Reflecting Elements(APREs)of the aRIS to maximize the minimum secrecy rate in the presence of EVs.This is a complex non-convex problem due to multiple optimization variables,high-dimensional matrix operations,and log-determinant objective functions,which makes it challenging to solve.Hence,a Successive Convex Approximation(SCA)-based optimization strategy is developed to efficiently solve the subproblems related to the UAV’s trajectory,aRIS’s APREs,and BS’s beamforming.By leveraging slack variables and approximation techniques,we solve the nonconvex subproblems by a sequence of convex subproblems.Simulation results demonstrate that the proposed UAV-aRIS network significantly outperforms its passive RIS counterpart in improving communication security,highlighting the effectiveness of the optimization strategy.展开更多
In this paper,we examine an illegal wireless communication network consisting of an illegal user receiving illegal signals from an illegal station and propose an active reconfigurable intelligent surface(ARIS)-assiste...In this paper,we examine an illegal wireless communication network consisting of an illegal user receiving illegal signals from an illegal station and propose an active reconfigurable intelligent surface(ARIS)-assisted multi-antenna jamming(MAJ)scheme denoted by ARIS-MAJ to interfere with the illegal signal transmission.In order to strike a balance between the jamming performance and the energy consumption,we consider a so-called jamming energy efficiency(JEE)which is defined as the ratio of achievable rate reduced by the jamming system to the corresponding power consumption.We formulate an optimization problem to maximize the JEE for the proposed ARIS-MAJ scheme by jointly optimizing the jammer’s beamforming vector and ARIS’s reflecting coefficients under the constraint that the jamming power received at the illegal user is lower than the illegal user’s detection threshold.To address the non-convex optimization problem,we propose the Dinkelbach-based alternating optimization(AO)algorithm by applying the semidefinite relaxation(SDR)algorithm with Gaussian randomization method.Numerical results validate that the proposed ARIS-MAJ scheme outperforms the passive reconfigurable intelligent surface(PRIS)-assisted multi-antenna jamming(PRIS-MAJ)scheme and the conventional multiantenna jamming scheme without RIS(NRIS-MAJ)in terms of the JEE.展开更多
Rigorous debates have followed the formulation of a new law that changes the way Chinese courts handle medical disputes.The draft Tort Liability Law,which is being deliberated by the National People’s Congress(NPC),C...Rigorous debates have followed the formulation of a new law that changes the way Chinese courts handle medical disputes.The draft Tort Liability Law,which is being deliberated by the National People’s Congress(NPC),China’s top legislature,deals with when a person/organization can be sued展开更多
Fuel yourselves with revolutionary spirit and drive the glorious proletariat toward a brighter future against the imperialist Western dogs.Or,ya know,don’t;it’s up to you really.Either way,TWOC has done its level be...Fuel yourselves with revolutionary spirit and drive the glorious proletariat toward a brighter future against the imperialist Western dogs.Or,ya know,don’t;it’s up to you really.Either way,TWOC has done its level best to bring you a Red China issue—from revolutionary intellectuals to villages living in the age of Mao.China’s relationship with communism展开更多
ACCORDING to information from the Ministry of Civil Affairs, in 1990, the number of divorced couples in China increased to 800,000—460,000 more than in 1980. The number more than doubled in just 10 years and will mor...ACCORDING to information from the Ministry of Civil Affairs, in 1990, the number of divorced couples in China increased to 800,000—460,000 more than in 1980. The number more than doubled in just 10 years and will more likely increase rather than decrease.展开更多
Dear Editor,Fungal keratitis is a serious and potentially sightthreatening infection that poses a global health concern,with higher incidence rates reported in low-income countries and regions with tropical climates[1...Dear Editor,Fungal keratitis is a serious and potentially sightthreatening infection that poses a global health concern,with higher incidence rates reported in low-income countries and regions with tropical climates[1-3].Risk factors for fungal keratitis include trauma with vegetative matter,contact lens wear,history of ocular surgery,chronic topical steroid use,low socioeconomic status and tropical climate[1-2].Fungi have the propensity to penetrate deep into the corneal stroma,making the infection difficult to treat with topical antifungal agents alone.Complications such as corneal perforation and endophthalmitis can arise in severe cases,making early identification of the causative fungal pathogen of utmost importance[4-5].Moreover,obtaining susceptibilities to the available antifungal agents can be sight and eye saving[5].展开更多
文摘1.arise(arose,arisen)vi.发生,出现。arise from 是“由……而引起”。例如:The buyer should contact the sellers as soon as possible when a claimon quality arises.当发生质量索赔时,买方应尽早同卖方联系。You must be responsible for all the losses arising from your delay inopening the covering L/C.你方必须对由于迟开信用证而造成的一切损失负责。
文摘子宫腺肌病是妇科常见的良性疾病,多见于30~50岁。随着对子宫腺肌病研究的不断深入,子宫腺肌病恶变(endometrial cancer arising in adenomyosis,EC-AIA)受到重视。EC-AIA患病率低,多为病例报道,但EC-AIA仍是威胁女性健康的临床问题,重要的是EC-AIA没有特异性症状和有效辅助检查手段,临床诊断困难,不易早期发现且容易漏诊、误诊和延迟诊断,需要不断总结再认识。
基金supported in part by the National Natural Science Foundation of China under Grant 62071253,Grant 62371252 and Grant 62271268in part by the Jiangsu Provincial Key Research and Development Program under Grant BE2022800in part by the Jiangsu Provincial 333 Talent Project.
文摘This paper considers a multi-antenna ac-cess point(AP)transmitting secrecy message to a single-antenna user in the presence of a single-antenna illegal eavesdropper(Eve)and proposes a double ac-tive reconfigurable intelligent surfaces(DARISs)as-sisted physical layer security(PLS)scheme denoted by DARISs-PLS to protect the secrecy message trans-mission.We formulate a secrecy rate maximization problem for the proposed DARISs-PLS scheme by considering a power budget constraint for the two ac-tive reconfigurable intelligent surfaces(ARISs)and AP.To address the formulated optimization problem,we jointly optimize the reflecting coefficients for the two ARISs and the beamforming at the AP in an it-erative manner by applying Dinkelbach based alter-nating optimization(AO)algorithm and a customized iterative algorithm together with the semidefinite re-laxation(SDR).Numerical results reveal that the pro-posed DARISs-PLS scheme outperforms the dou-ble passive reconfigurable intelligent surfaces-assisted PLS method(DPRISs-PLS)and single ARIS-assisted PLS method(SARIS-PLS)in terms of the secrecy rate.
基金co-supported by Technology Key Project of Guangdong Province,China(No.HZJBGS-2021001)the Shanghai Sailing Scholar,China(No.23YF1412700)+1 种基金the National Natural Science Foundation of China(No.61901254)the Shanghai Technical Service Computing Center of Science and Engineering,Shanghai University,China.
文摘This paper explores a UAV-mounted active Reconfigurable Intelligent Surface(aRIS)network designed to enhance secure downlink communication for multiple users while mitigating the impact of multiple Eavesdroppers(EVs).The focus is on optimizing the UAV’s trajectory,the Base Station’s(BS)transmit beamforming,and the power-Amplified Programmable Reflecting Elements(APREs)of the aRIS to maximize the minimum secrecy rate in the presence of EVs.This is a complex non-convex problem due to multiple optimization variables,high-dimensional matrix operations,and log-determinant objective functions,which makes it challenging to solve.Hence,a Successive Convex Approximation(SCA)-based optimization strategy is developed to efficiently solve the subproblems related to the UAV’s trajectory,aRIS’s APREs,and BS’s beamforming.By leveraging slack variables and approximation techniques,we solve the nonconvex subproblems by a sequence of convex subproblems.Simulation results demonstrate that the proposed UAV-aRIS network significantly outperforms its passive RIS counterpart in improving communication security,highlighting the effectiveness of the optimization strategy.
基金supported in part by the National Natural Science Foundation of China under Grant 62071253,Grant 62371252 and Grant 62271268in part by the Jiangsu Provincial Key Research and Development Program under Grant BE2022800in part by the Jiangsu Provincial 333 Talent Project.
文摘In this paper,we examine an illegal wireless communication network consisting of an illegal user receiving illegal signals from an illegal station and propose an active reconfigurable intelligent surface(ARIS)-assisted multi-antenna jamming(MAJ)scheme denoted by ARIS-MAJ to interfere with the illegal signal transmission.In order to strike a balance between the jamming performance and the energy consumption,we consider a so-called jamming energy efficiency(JEE)which is defined as the ratio of achievable rate reduced by the jamming system to the corresponding power consumption.We formulate an optimization problem to maximize the JEE for the proposed ARIS-MAJ scheme by jointly optimizing the jammer’s beamforming vector and ARIS’s reflecting coefficients under the constraint that the jamming power received at the illegal user is lower than the illegal user’s detection threshold.To address the non-convex optimization problem,we propose the Dinkelbach-based alternating optimization(AO)algorithm by applying the semidefinite relaxation(SDR)algorithm with Gaussian randomization method.Numerical results validate that the proposed ARIS-MAJ scheme outperforms the passive reconfigurable intelligent surface(PRIS)-assisted multi-antenna jamming(PRIS-MAJ)scheme and the conventional multiantenna jamming scheme without RIS(NRIS-MAJ)in terms of the JEE.
文摘Rigorous debates have followed the formulation of a new law that changes the way Chinese courts handle medical disputes.The draft Tort Liability Law,which is being deliberated by the National People’s Congress(NPC),China’s top legislature,deals with when a person/organization can be sued
文摘Fuel yourselves with revolutionary spirit and drive the glorious proletariat toward a brighter future against the imperialist Western dogs.Or,ya know,don’t;it’s up to you really.Either way,TWOC has done its level best to bring you a Red China issue—from revolutionary intellectuals to villages living in the age of Mao.China’s relationship with communism
文摘ACCORDING to information from the Ministry of Civil Affairs, in 1990, the number of divorced couples in China increased to 800,000—460,000 more than in 1980. The number more than doubled in just 10 years and will more likely increase rather than decrease.
文摘Dear Editor,Fungal keratitis is a serious and potentially sightthreatening infection that poses a global health concern,with higher incidence rates reported in low-income countries and regions with tropical climates[1-3].Risk factors for fungal keratitis include trauma with vegetative matter,contact lens wear,history of ocular surgery,chronic topical steroid use,low socioeconomic status and tropical climate[1-2].Fungi have the propensity to penetrate deep into the corneal stroma,making the infection difficult to treat with topical antifungal agents alone.Complications such as corneal perforation and endophthalmitis can arise in severe cases,making early identification of the causative fungal pathogen of utmost importance[4-5].Moreover,obtaining susceptibilities to the available antifungal agents can be sight and eye saving[5].
