In this paper, we discuss the effects of error feedback on the output of a nonlinear bistable system with stochastic resonance. The bit error rate is employed to quantify the performance of the system. The theoretical...In this paper, we discuss the effects of error feedback on the output of a nonlinear bistable system with stochastic resonance. The bit error rate is employed to quantify the performance of the system. The theoretical analysis and the numerical simulation are presented. By investigating the performances of the nonlinear systems with different strengths of error feedback, we argue that the presented system may provide guidance for practical nonlinear signal processing.展开更多
A physical model for simulating plasmonic solar cells (SCs) using the SILVACO TCAD simulator is establisled and the effects of some factors on the efficiency enhancement of the amorphous silicon thin film SCs are simu...A physical model for simulating plasmonic solar cells (SCs) using the SILVACO TCAD simulator is establisled and the effects of some factors on the efficiency enhancement of the amorphous silicon thin film SCs are simulated.Through this simulation,it is demonstrated that our method can successfully simulate the optical and electrical properties of plasmonic solar cells without the overestimation of the characteristics and without the neglect of parameter change in the device operation process.It is shown that not only the size and kind of metal nanoparticles but also other factors,such as the surrounding medium,the distance from the bottom of particles to the device surface,and the light incident angle,play important roles in the optical and electrical properties of plasmonic SCs.展开更多
A channel-selectable optical link based on a silicon microring resonator is proposed and demonstrated.This optical link consists of the wavelength-tunable microring modulators and the filters,defined on a silicon-on-i...A channel-selectable optical link based on a silicon microring resonator is proposed and demonstrated.This optical link consists of the wavelength-tunable microring modulators and the filters,defined on a silicon-on-insulator(SOI)platform.With a p–i–n junction embedded in the microring modulator,light at the resonant wavelength of the ring resonator is modulated.The 2^(nd)-order microring add-drop filter routes the modulated light.The channel selectivity is demonstrated by heating the microrings.With a thermal tuning efficiency of 5.9 mW/nm,the filter drop port response was successfully tuned with 0.8 nm channel spacing.We also show that modulation can be achieved in these channels.This device aims to offer flexibility and increase the bandwidth usage efficiency in optical interconnection.展开更多
Person image generation aims to generate images that maintain the original human appearance in different target poses.Recent works have revealed that the critical element in achieving this task is the alignment of app...Person image generation aims to generate images that maintain the original human appearance in different target poses.Recent works have revealed that the critical element in achieving this task is the alignment of appearance domain and pose domain.Previous alignment methods,such as appearance flow warping,correspondence learning and cross attention,often encounter challenges when it comes to producing fine texture details.These approaches suffer from limitations in accurately estimating appearance flows due to the lack of global receptive field.Alternatively,they can only perform cross-domain alignment on high-level feature maps with small spatial dimensions since the computational complexity increases quadratically with larger feature sizes.In this article,the significance of multi-scale alignment,in both low-level and high-level domains,for ensuring reliable cross-domain alignment of appearance and pose is demonstrated.To this end,a novel and effective method,named Multi-scale Crossdomain Alignment(MCA)is proposed.Firstly,MCA adopts global context aggregation transformer to model multi-scale interaction between pose and appearance inputs,which employs pair-wise window-based cross attention.Furthermore,leveraging the integrated global source information for each target position,MCA applies flexible flow prediction head and point correlation to effectively conduct warping and fusing for final transformed person image generation.Our proposed MCA achieves superior performance on two popular datasets than other methods,which verifies the effectiveness of our approach.展开更多
A method using the time reversal（TR） technique to measure the insertion loss（IL） of passive materials is presented.Firstly the received signals are focused according to the TR theory when there is not a sample bet...A method using the time reversal（TR） technique to measure the insertion loss（IL） of passive materials is presented.Firstly the received signals are focused according to the TR theory when there is not a sample between the source and the received array.Then,the sample is placed near the received array and the TR processing is again employed to realize the focus of the received signal.Finally,the IL of the sample is evaluated from these focusing signals.Because the TR processing can focus the energy in spatial domain and time domain,the method can be used to measure acoustic properties of passive materials in a waveguide tank with reflections induced by boundaries or with low source frequencies.Two samples with the same size of 1.1 m×1.0 m×5 mm are tested in the waveguide tank.The method is demonstrated by the comparison of the theoretical and the experimental results in the measured frequency range of 1-20 kHz.展开更多
A method based on 3D videos is proposed for multi-target segmentation and tracking with a moving viewing system. A spatiotemporal energy functional is built up to perform motion segmentation and estimation simultaneou...A method based on 3D videos is proposed for multi-target segmentation and tracking with a moving viewing system. A spatiotemporal energy functional is built up to perform motion segmentation and estimation simultaneously. To overcome the limitation of the local minimum problem with the level set method, a convex relaxation method is applied to the 3D spatiotemporal segmentation model. The relaxed convex model is independent of the initial condition. A primal-dual algorithm is used to improve computational efficiency. Several indoor experiments show the validity of the proposed method.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 61171147 and 60702022)
文摘In this paper, we discuss the effects of error feedback on the output of a nonlinear bistable system with stochastic resonance. The bit error rate is employed to quantify the performance of the system. The theoretical analysis and the numerical simulation are presented. By investigating the performances of the nonlinear systems with different strengths of error feedback, we argue that the presented system may provide guidance for practical nonlinear signal processing.
基金Supported by the National Natural Science Foundation of China under Grant No 6177055.
文摘A physical model for simulating plasmonic solar cells (SCs) using the SILVACO TCAD simulator is establisled and the effects of some factors on the efficiency enhancement of the amorphous silicon thin film SCs are simulated.Through this simulation,it is demonstrated that our method can successfully simulate the optical and electrical properties of plasmonic solar cells without the overestimation of the characteristics and without the neglect of parameter change in the device operation process.It is shown that not only the size and kind of metal nanoparticles but also other factors,such as the surrounding medium,the distance from the bottom of particles to the device surface,and the light incident angle,play important roles in the optical and electrical properties of plasmonic SCs.
基金Supported by the National Natural Science Foundation of China under Grant No 60977043the National High-Technology Research and Development Program of China under Grant No 2012AA012203,and Tang Zhongyin Fund.
文摘A channel-selectable optical link based on a silicon microring resonator is proposed and demonstrated.This optical link consists of the wavelength-tunable microring modulators and the filters,defined on a silicon-on-insulator(SOI)platform.With a p–i–n junction embedded in the microring modulator,light at the resonant wavelength of the ring resonator is modulated.The 2^(nd)-order microring add-drop filter routes the modulated light.The channel selectivity is demonstrated by heating the microrings.With a thermal tuning efficiency of 5.9 mW/nm,the filter drop port response was successfully tuned with 0.8 nm channel spacing.We also show that modulation can be achieved in these channels.This device aims to offer flexibility and increase the bandwidth usage efficiency in optical interconnection.
基金National Natural Science Foundation of China,Grant/Award Number:62274142Hangzhou Major Technology Innovation Project of Artificial Intelligence,Grant/Award Number:2022AIZD0060。
文摘Person image generation aims to generate images that maintain the original human appearance in different target poses.Recent works have revealed that the critical element in achieving this task is the alignment of appearance domain and pose domain.Previous alignment methods,such as appearance flow warping,correspondence learning and cross attention,often encounter challenges when it comes to producing fine texture details.These approaches suffer from limitations in accurately estimating appearance flows due to the lack of global receptive field.Alternatively,they can only perform cross-domain alignment on high-level feature maps with small spatial dimensions since the computational complexity increases quadratically with larger feature sizes.In this article,the significance of multi-scale alignment,in both low-level and high-level domains,for ensuring reliable cross-domain alignment of appearance and pose is demonstrated.To this end,a novel and effective method,named Multi-scale Crossdomain Alignment(MCA)is proposed.Firstly,MCA adopts global context aggregation transformer to model multi-scale interaction between pose and appearance inputs,which employs pair-wise window-based cross attention.Furthermore,leveraging the integrated global source information for each target position,MCA applies flexible flow prediction head and point correlation to effectively conduct warping and fusing for final transformed person image generation.Our proposed MCA achieves superior performance on two popular datasets than other methods,which verifies the effectiveness of our approach.
文摘A method using the time reversal（TR） technique to measure the insertion loss（IL） of passive materials is presented.Firstly the received signals are focused according to the TR theory when there is not a sample between the source and the received array.Then,the sample is placed near the received array and the TR processing is again employed to realize the focus of the received signal.Finally,the IL of the sample is evaluated from these focusing signals.Because the TR processing can focus the energy in spatial domain and time domain,the method can be used to measure acoustic properties of passive materials in a waveguide tank with reflections induced by boundaries or with low source frequencies.Two samples with the same size of 1.1 m×1.0 m×5 mm are tested in the waveguide tank.The method is demonstrated by the comparison of the theoretical and the experimental results in the measured frequency range of 1-20 kHz.
基金supported by the National Natural Science Foundation of China (No. 60872069)the National Basic Research Program (973)of China (No. 2012CB316400)
文摘A method based on 3D videos is proposed for multi-target segmentation and tracking with a moving viewing system. A spatiotemporal energy functional is built up to perform motion segmentation and estimation simultaneously. To overcome the limitation of the local minimum problem with the level set method, a convex relaxation method is applied to the 3D spatiotemporal segmentation model. The relaxed convex model is independent of the initial condition. A primal-dual algorithm is used to improve computational efficiency. Several indoor experiments show the validity of the proposed method.
