In chronic stage of stroke, it is necessary to pay attention to the complex spatial movements training along with the traditional restoration of balance, strength of particular muscles, and paretic limb joints mobilit...In chronic stage of stroke, it is necessary to pay attention to the complex spatial movements training along with the traditional restoration of balance, strength of particular muscles, and paretic limb joints mobility. The aim of the study was to evaluate the effectiveness of robotic therapy in the recovery of upper limb function in the chronic stage of stroke. The study involved 52 patients with ischemic stroke in the middle cerebral artery. The patients were divided randomly into 2 groups. All patients （5 days/wk × 3 wk） got gymnastics by the standard technique, massage, laser, and pulsed currents therapy. Main group patients （n = 36） extra received complex spatial movements, speed, fluidity, precision and agility training by the robotic electromechanical device Multi Joint System （MJS） （40 minutes, 5 days/wk × 3 wk）. Analysis of the results of the study showed a statistically significant difference in improving ROM of the elbow and shoulder joints, speed and accuracy of movement in the main group compared with the control. Hardware recovery of complex spatial upper limb movements in the chronic stage of stroke increases the functionality and independence of the patient＇s domestic skills.展开更多
We demonstrate a 7-bit photonic true-time-delay （TTD） system which uses an 8 × 8 micro-optical-electro- mechanical system （MOEMS） optical switch for phased array antennas （PAAs） beamforming applications. Th...We demonstrate a 7-bit photonic true-time-delay （TTD） system which uses an 8 × 8 micro-optical-electro- mechanical system （MOEMS） optical switch for phased array antennas （PAAs） beamforming applications. The switch controls the optical signal to pass by the fiber delay lines （FDLs） of different lengths. Different time delays between adjacent channels are obtained due to the chromatic dispersion of FDLs. Therefore, the system cannot be disturbed by the environment. The measured time delay responses are nearly linear with the wavelength spacing between optical carriers as well as the lengths of FDLs, which agrees well with the theoretical analysis.展开更多
We propose a new Fourier transform spectrometer based on programmable microelectromechanical systems （MEMS） micro-mirror and an improved Michelson interferometer. The principle of the spectrometer is theoretically a...We propose a new Fourier transform spectrometer based on programmable microelectromechanical systems （MEMS） micro-mirror and an improved Michelson interferometer. The principle of the spectrometer is theoretically analyzed. A signal acquisition unit and an experimental set-up are designed. The spectrum of the polychromatie light source is obtained at a slantwise reflector angle of O.238°. The spectrum is analyzed by this system within the near infrared. The experimental results show that the spectral accuracy is less than 3 nm, and the signal-to-noise ratio （SNR） is 18 dB. The spectral resolution is less than 16 nm.展开更多
文摘In chronic stage of stroke, it is necessary to pay attention to the complex spatial movements training along with the traditional restoration of balance, strength of particular muscles, and paretic limb joints mobility. The aim of the study was to evaluate the effectiveness of robotic therapy in the recovery of upper limb function in the chronic stage of stroke. The study involved 52 patients with ischemic stroke in the middle cerebral artery. The patients were divided randomly into 2 groups. All patients （5 days/wk × 3 wk） got gymnastics by the standard technique, massage, laser, and pulsed currents therapy. Main group patients （n = 36） extra received complex spatial movements, speed, fluidity, precision and agility training by the robotic electromechanical device Multi Joint System （MJS） （40 minutes, 5 days/wk × 3 wk）. Analysis of the results of the study showed a statistically significant difference in improving ROM of the elbow and shoulder joints, speed and accuracy of movement in the main group compared with the control. Hardware recovery of complex spatial upper limb movements in the chronic stage of stroke increases the functionality and independence of the patient＇s domestic skills.
基金supported by the Subsidized Projecton Aerospace Technology Innovation Foundation of China Aerospace Science and Technology Corporationthe National Natural Science Foundation of China(No. 10778713 and 60736002)
文摘We demonstrate a 7-bit photonic true-time-delay （TTD） system which uses an 8 × 8 micro-optical-electro- mechanical system （MOEMS） optical switch for phased array antennas （PAAs） beamforming applications. The switch controls the optical signal to pass by the fiber delay lines （FDLs） of different lengths. Different time delays between adjacent channels are obtained due to the chromatic dispersion of FDLs. Therefore, the system cannot be disturbed by the environment. The measured time delay responses are nearly linear with the wavelength spacing between optical carriers as well as the lengths of FDLs, which agrees well with the theoretical analysis.
基金supported by the National Natural Science Foundation of China under Grant No.60976084
文摘We propose a new Fourier transform spectrometer based on programmable microelectromechanical systems （MEMS） micro-mirror and an improved Michelson interferometer. The principle of the spectrometer is theoretically analyzed. A signal acquisition unit and an experimental set-up are designed. The spectrum of the polychromatie light source is obtained at a slantwise reflector angle of O.238°. The spectrum is analyzed by this system within the near infrared. The experimental results show that the spectral accuracy is less than 3 nm, and the signal-to-noise ratio （SNR） is 18 dB. The spectral resolution is less than 16 nm.
