Hongda Chen

Chinese Academy of Sciences

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Beiju Huang

University of Chinese Academy of Sciences

Weihua Pei

Chinese Academy of Sciences

Chuantong Cheng

State Key Laboratory on Integrated Optoelectronics

Zan Zhang

Chang'an University

Zhenxin Wang

Changchun Institute of Applied Chemistry

Zanyun Zhang

Tianjin Polytechnic University

Yiyang Xie

Beijing University of Technology

Xurui Mao

Xinjiang University

Changyu Han

Chinese Academy of Sciences

Qiang Gui

Chinese Academy of Sciences

Cooperative Institutions

Chinese Academy of Sciences

304

University of Chinese Academy of Sciences

144

Institute of Semiconductors

122

State Key Laboratory on Integrated Optoelectronics

109

Tsinghua University

University of Science and Technology of China

Tianjin University

Peking University

Jilin University

Beijing University of Technology

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Simulation of a Monolithic Integrated CMOS Preamplifier for Neural Recordings

Journal of Semiconductors (2005)

Xiaohong Sui Liu Jinbin Gu Ming Weihua Pei Hongda Chen

A monolithic integrated CMOS preamplifier is presented for neural recording applications. Two AC-coupied capacitors are used to eliminate the large and random DC offsets existing in the electrode-electrolyte interface. Diode-connected nMOS transistors with a negative voltage between the gate and source are candidates for the large resistors necessary for the preamplifier. A novel analysis is given to determine the noise power spectral density. Simulation results show that the two-stage CMOS preamplifier in a closed-loop capacitive feedback configuration provides an AC in-band gain of 38.8dB,a DC gain of 0,and an input-referred noise of 277nVmax, integrated from 0. 1Hz to 1kHz. The preamplifier can eliminate the DC offset voltage and has low input-referred noise by novel circuit configuration and theoretical analysis.

Preamplifier

Flicker noise

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Citations (2)

An online brain-computer interface in mobile virtual reality environments

Integrated Computer-Aided Engineering (2018)

Zhaolin Yao Yijun Wang Chen Yang Weihua Pei Xiaorong Gao

The brain-computer interface (BCI) technology provides a potential tool for communication and control in immersive virtual reality (VR) environments. However, implementing a BCI with current VR platforms remains a challenge due to difficulties in system design and electroencephalogram (EEG) analysi s. This study aims to explore the feasibility of a steady-state visual evoked potential (SSVEP)-based BCI for applications in room-scale VR with an HTC VIVE headset. A four-class BCI was designed to simulate a cursor control system. Subjects were instructed to perform a cue-guided target selection task during standing or walking on a treadmill at four different speeds (0, 0.45, 0.89, and 1.34 meters per second (m/s)). During the experiment, two fixing modes of visual stimuli (head-fixed and earth-fixed) were presented to the head-mounted display (HMD). The results from a group of 10 subjects indicated that the system worked well regarding classification accuracy. The BCI performance decreased as the walking speed increased. Interestingly, the earth-fixed condition showed significantly higher performance than the head-fixed condition, showing online and offline information transfer rates (ITRs) corresponding to unsupervised and supervised algorithms above 10 bits/min and 21 bits/min, respectively. These results demonstrated the potential of an SSVEP-based BCI for applications in room-scale mobile VR environments.

Headset

Interface (matter)

Headphones

Optical head-mounted display

Cursor (databases)

10.3233/ica-180586

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Citations (16)

光子晶体氮化镓发光二极管发光提取特性研究

Chinese Optics Letters (2009)

Hongwei Liu Qiang Kan Chunxia Wang Feng Yu Xingsheng Xu

Ultraviolet photo-lithography is employed to introduce two-dimensional (2D) photonic crystal (PC) structure on the top surface of GaN-based light emitting diode (LED).PC patterns are transferred to 460-nmthick transparent indium tin oxide (ITO) electrode by inductively coupled plasma (ICP) etching.Light intensity of PC-LED can be enhanced by 38% comparing with the one without PC structure.Rigorous coupled wave analysis method is performed to calculate the light transmission spectrum of PC slab.Simulation results indicate that total internal reflect angle which modulated by PC structure has been increased by 7 • , which means that the light extraction efficiency is enhanced outstandingly.

10.3788/col20090710.0918

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Citations (4)

Integrated temperature sensor and close-loop control circuit for silicon microring modulator

Hao Zhang Ye Yuan Zan Zhang Beiju Huang Hongda Chen

Microring (MR) devices require thermal stabilization to match their intended operating wavelengths. In this work, we present a scheme for thermal stabilization of MR modulators utilizing integrated temperature sensor and closed-loop control unit based on CMOS integrated circuit. Temperature of the MR modulator is directly monitored by a diode based monolithic temperature sensor. The measured temperature is used in a feedback loop to adjust the thermal tuner of the MR. Thermal steady state and transient simulations are performed showing that temperature tuning range from 30 to 100℃ can be achieved. Considering the relatively slow heat transfer process, unity-gain bandwidth of the control circuit is optimized to ensure loop stability. This design can effectively compensate ambient thermal noise and adjust the deviation of the operating wavelength caused by the process error

Tuner

10.1117/12.2643674

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A Novel Approach to Corona Monitoring

Lecture notes in computer science (2005)

Chiman Kwan Tao Qian Zhubing Ren Hongda Chen Roger Xu

Corona (planetary geology)

10.1007/11427469_80

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Citations (3)

An efficient photothermal–chemotherapy platform based on a polyacrylamide/phytic acid/polydopamine hydrogel

Journal of Materials Chemistry B (2022)

Zhen Zhao Hua Zhang Hongda Chen Yuanhong Xu Lina Ma

An effective platform for chemophotothermal therapy based on a polyacrylamide/phytic acid/polydopamine hydrogel was constructed and applied to tumor treatment with its highly efficient drug loading and photothermal heating properties.

Polyacrylamide

Photothermal effect

10.1039/d2tb00677d

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Citations (7)

A mixed-interval multi-pulse position modulation scheme for real-time visible light communication system

Optics Communications (2017)

Luhong Mao Cheng Li Hong‐Lei Li Xiongbin Chen Xurui Mao

Modulation (music)

Pulse-position modulation

10.1016/j.optcom.2017.06.024

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Citations (8)

Wearable Flexible Phototherapy Device for Knee Osteoarthritis

Electronics (2021)

Kun Liu Hongda Chen Yuguang Wang Mengqi Wang Jun Tang

Knee osteoarthritis (OA) is a highly prevalent and disabling disease that causes pain and gradual degeneration of the articular cartilage. Phototherapy is a new physiotherapy treatment, more effective and stable than other non-pharmacologic management. Conventional phototherapy devices typically suffer from unintelligent and bulky equipment, while existing phototherapy methods require maintain a certain phototherapy distance. Here, we introduce a wearable flexible phototherapy device worn on a knee for osteoarthritis, incorporating a phototherapy adhesive patch and a control box. The phototherapy adhesive patch is capable of softly laminating onto the curved surfaces of the knee skin to increase the effects of phototherapy. We describe the LED array, constant current drive module, key control module, and power supply module that serve as the foundations for the control box. The weight of the device is only 101.8 g. The irradiance of the device can be adjusted linearly and irradiance of the designed phototherapy device based on LED can reach 13 mW/cm2. The maximum temperature of the surface of the light source is 31.2 °C. The device proposed in this work exhibits satisfactory stability, promising a potential in phototherapy.

10.3390/electronics10161891

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Citations (5)

Neutrophil mediated postoperative photoimmunotherapy against melanoma skin cancer

Nanoscale (2021)

Yunyun Wu Xiaoqing Han Runxiao Zheng Hongda Chen Jiao Yan

Neutrophils acted as carriers to deliver photoimmunotherapeutic nanoparticles for inhibiting the postoperative tumor recurrence.

10.1039/d1nr04002b

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Citations (9)

THz modulators based 2D nanosheet materials

Journal of Nanomedicine & Nanotechnology (2017)

Zhaoxin Geng Hongda Chen

Nanosheet

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