592 results on '"Cheng, Yuhua"'
Search Results
552. Noise Model
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
553. Capacitance Model
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
554. Source/Drain Parasitics Model
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
555. Temperature Dependence Model
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
556. I–V Model
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
557. Threshold Voltage Model
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
558. Significant Physical Effects In Modern MOSFETs
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
559. Introduction
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
560. Model Parameter Extraction
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
561. RF and Other Compact Model Applications
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
562. BSIM3v3 Model Implementation
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
563. Non-quasi Static (NQS) Model
- Author
-
Cheng, Yuhua and Hu, Chenming
- Published
- 2002
- Full Text
- View/download PDF
564. Energy-saving control strategy for lighting system based on multivariate extremum seeking with Newton algorithm.
- Author
-
Yin, Chun, Dadras, Sara, Huang, Xuegang, Mei, Jun, Malek, Hadi, and Cheng, Yuhua
- Subjects
- *
ELECTRIC power consumption , *ELECTRIC power conservation , *LIGHTING , *MULTIVARIATE analysis , *ALGORITHMS - Abstract
In recent years, the energy problem has been a universal concern. In order to improve the lighting energy efficiency and reduce the electric energy consumption, this paper develops an energy-saving control strategy for the lighting system with multiple lighting sources. The control strategy presented in this paper includes two parts: a new multivariate extremum seeking control method with Newton algorithm is developed to minimize the light-energy consumption by separately manipulating the brightness of multiple lighting sources, and a proportion-integration-differentiation control approach is adopted to realize the desired lighting level. The proposed scheme can increase the convergence speed of the closed loop system toward the minimum light-energy consumption, meanwhile, the accuracy of the control strategy will be improved. Experimental results illustrate that the light-energy consumption via the proposed method can reach more rapidly to a smaller vicinity of the minimum energy point, so, the lighting energy efficiency is greatly increased accordingly. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
565. Fractional-order exponential switching technique to enhance sliding mode control.
- Author
-
Yin, Chun, Huang, Xuegang, Chen, Yangquan, Dadras, Sara, Zhong, Shou-ming, and Cheng, Yuhua
- Subjects
- *
SLIDING mode control , *NONLINEAR systems , *LINEAR matrix inequalities , *COMPUTER simulation , *ROBUST stability analysis - Abstract
In this paper, a fractional-order sliding mode controller (FO SMC) based on an FO exponential switching technique and an FO proportional–integral (PI) switching surface is proposed for robust stabilization of uncertain FO nonlinear systems. The FO exponential switching technique, involving an FO sign function, is designed to guarantee the existence of the sliding motion in finite time. Reaching time is analytically derived and the reachability analysis is presented to explicate the superiority of the control performance. The stability analysis of sliding mode dynamics is performed relying on stable region analysis of FO systems. Simulation and practical results demonstrate the advantages of the designed control scheme. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
566. State estimation for asynchronous sensor systems with Markov jumps and multiplicative noises.
- Author
-
Geng, Hang, Wang, Zidong, Liang, Yan, Cheng, Yuhua, and Alsaadi, Fuad E.
- Subjects
- *
STATE estimation in electric power systems , *ESTIMATION theory , *ASYNCHRONOUS learning , *MARKOV processes , *MEAN square algorithms , *ORTHOGONAL functions - Abstract
This paper is concerned with the asynchronous state estimation problem for sensor systems subject to Markov jump parameters and multiplicative noises. The asynchronous sensors considered can have arbitrary sampling rates and arbitrary initial sampling instants. By transforming the asynchronous measurements within each fusion interval into an augmented measurement, the equivalent measurement equation and state equation at the fusion time instant are constructed. Based on the two equations, a linear minimum mean-squared error (LMMSE) estimator is developed using the orthogonality projection principle. Due to the existence of the common process noise in the equivalent process and measurement noises, the equivalent process and measurement noises are cross-correlated and the equivalent measurement noises are autocorrelated. These correlations are taken into account in the estimator design. The stationary case is also studied and the sufficient condition is established for the stability of the proposed estimator. A target tracking example is provided to illustrate the effectiveness of the proposed estimator. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
567. Comparative study of methane adsorption of Middle-Upper Ordovician marine shales in the western Ordos Basin, NW China: Insights into impacts of moisture on thermodynamics and kinetics of adsorption.
- Author
-
Huang, Hexin, Li, Rongxi, Lyu, Zhou, Cheng, Yuhua, Zhao, Bangsheng, Jiang, Zhenxue, Zhang, Yanni, and Xiong, Fengyang
- Subjects
- *
THERMODYNAMICS , *GAS absorption & adsorption , *ADSORPTION (Chemistry) , *SHALE , *ADSORPTION capacity , *ADSORPTION isotherms , *ADSORPTION kinetics - Abstract
• Interaction between the adsorbate and the adsorbent impacts CH 4 adsorption in shale. • Presence of H 2 O increases the difficulty of CH 4 adsorption. • H 2 O exerts less impact on the change of CH 4 adsorption capacity in shale at low pressure. • H 2 O poses less impact on the change of CH 4 adsorption rate in shale at high pressure. Impacts of water molecules on subsurface shale gas adsorption is a challenging topic in the assessment of shale gas resources and the selection of optimized exploitation plans. And scholars have recognized that water molecules occupy adsorption sites on hydrophilic pore walls. However, the impacts of water molecules on the thermodynamics and kinetics of methane adsorption in shales remains poorly understood. We document a series of high-pressure methane adsorption isotherms of dry and moisture-equilibrated samples of the Middle-Upper Ordovician Wulalike shale at 20–120 °C and up to 30 MPa. Quantitative analyses of the thermodynamic and kinetic characteristics are carried out. Results show that water molecules do not change the impacts of temperature and pressure on the trend of isotherms, thermodynamics, and kinetics of methane adsorption. The impacts of temperature, pressure, methane adsorption capacity, and water molecules on the methane adsorption are basically functioned by modifying the interactions between the adsorbate and the adsorbent. The presence of water molecules in shales leads to a decrease of ∼ 77.06% in the capacity of methane adsorption, an increase of ∼ 70.46% in the adsorption heat (Q st), a decrease of ∼ 96.62% in the standard entropy (△S0), and a decrease of ∼ 1/9 to 1/5 in the Bangham adsorption rate (k b). The impacts of water molecules on the decline of methane adsorption at high pressure is lower than that at low pressure, however, on the decrease of methane adsorption rate higher than that at low pressure. The study also reflects the methane adsorption into the three-dimensional network system of kerogen. This work can improve our understanding of subsurface supercritical adsorption under reservoir conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
568. Ultrasensitive flexible NO2 gas sensors via multilayer porous polymer film.
- Author
-
Gao, Lin, Liu, Changjian, Peng, Yujie, Deng, Jinyi, Hou, Sihui, Cheng, Yuhua, Huang, Wei, and Yu, Junsheng
- Subjects
- *
GAS detectors , *POROUS polymers , *ELECTRONIC noses , *STRUCTURAL engineering , *ORGANIC semiconductors , *DIFFUSION - Abstract
Micro-nano structure engineering of active materials in sensors have attracted broad attention for hazardous component detection, which enables creating electronic noses that could detect gas analytes efficiently without introducing abundant functional groups and defects. However, challenges still remain on realizing flexible gas sensors with both decent sensing performance and good mechanical robustness, which are extremely important for wearable electronics. Here we present a scalable and facile manufacturing method to construct the three-dimensional (3D) multilayer porous organic semiconductors (OSCs) structure for transistor based gas sensor, showing largely enhanced gas sensing properties as well as bendability down to 1 mm radius with stable operation. The multilayer porous film of OSCs is assembled via breath figure method, followed by layer-by-layer transferring process. The formed 3D porous structure provides efficient hazardous gas diffusion pathways, abundant gas molecules adsorption active sites and immunity towards mechanical deformation simultaneously. Consequently, an obvious increase of responsivity (from 122% to 1053% at 30 ppm) was achieved for NO 2 detection, along with an ultralow limit of detection (∼2.3 ppb), and good gas selectivity. This work demonstrates a scalable and low-cost fabrication strategy for high-performance flexible sensors, which delivers an alternative way for next-generation wearable electronics. • Porous polymer film was achieved via breath figure method, followed by transfer technique to construct OFET. • Multilayer Porous OFET-based gas sensor with high electrical performance was realized. • Flexible 3D gas sensors with stable mechanical properties were demonstrated. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
569. A 1.1V 12W 86dB DR Sigma-Delta Modulator for Health Monitoring System.
- Author
-
Zhao, Long, Deng, Chenxi, Wang, Guan, Chen, Hongming, and Cheng, Yuhua
- Subjects
- *
DELTA-sigma modulation , *LOW voltage systems , *COMPLEMENTARY metal oxide semiconductors , *ENERGY consumption , *BANDWIDTHS , *SWITCHED capacitor circuits - Abstract
A low-voltage low-power Sigma-Delta modulator for health monitoring system is designed using a standard 0.18m CMOS technology. To achieve high accuracy with low power consumption in low supply voltage environment, the designed modulator is implemented with a one-bit third-order topology, in which the input-feedforward structure and switched-opamp (SO) technique are combined. Using the proposed design method, the SO meets the system requirements with the minimal power consumption and good stability in a feedback loop. The modulator achieves 86dB dynamic range (DR) over a 300Hz bandwidth with an oversampling ratio (OSR) of 128, while it occupies 0.16mm2 and consumes 12W under a 1.1V supply. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
570. Robust stability analysis of fractional-order uncertain singular nonlinear system with external disturbance.
- Author
-
Yin, Chun, Zhong, Shou-ming, Huang, Xuegang, and Cheng, Yuhua
- Subjects
- *
ROBUST stability analysis , *NONLINEAR systems , *LINEAR matrix inequalities , *COMPUTER simulation , *DERIVATIVES (Mathematics) - Abstract
This paper investigates robust stability for fractional-order (FO) singular nonlinear systems. The FO system is disturbed by external uncertainty and disturbance. A central analysis technique is enabled by proposing a fundamental boundedness lemma, for the first time. This lemma is used for robust stability analysis of FO systems, especially for Mittag–Leffler stability analysis of FO nonlinear systems. More importantly, how to obtain a more accurate bound is given to reduce conservative. An FO proportional-derivative (PD) controller is proposed to normalize the FO singular system. Furthermore, a criterion for stability of the normalized FO nonlinear systems is provided by linear matrix inequalities (LMIs). Finally, two illustrative simulation examples are presented to illustrate effectiveness of the proposed stability notion. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
571. A Systematic Study of ESD Protection Co-Design With High-Speed and High-Frequency ICs in 28 nm CMOS.
- Author
-
Lu, Fei, Ma, Rui, Dong, Zongyu, Wang, Li, Zhang, Chen, Wang, Chenkun, Chen, Qi, Wang, X. Shawn, Zhang, Feilong, Li, Cheng, Tang, He, Cheng, Yuhua, and Wang, Albert
- Subjects
- *
ELECTROSTATIC discharges , *ELECTRONIC circuit protection , *INTEGRATED circuits , *COMPLEMENTARY metal oxide semiconductors , *FAILURE analysis , *LINE drivers (Integrated circuits) - Abstract
This paper discusses a systematic study of electrostatic discharge (ESD) protection circuit co-design and analysis technique for high-frequency and high-speed ICs in 28 nm CMOS. The comprehensive ESD-IC co-design flow includes ESD device optimization and characterization, ESD behavioral modeling, backend interconnect characterization, parasitic ESD parameter extraction, ESD failure analysis and ESD co-design evaluation for ICs operating at up to 15 GHz and 40 Gbps. Ring oscillator, dummy I/O buffer and current mode logic (CML) circuits were used to demonstrate the co-design method. This practical ESD-IC co-design technique can be applied to high-performance, high-frequency and high-speed ICs. [ABSTRACT FROM PUBLISHER]
- Published
- 2016
- Full Text
- View/download PDF
572. Reliability and importance analysis of uncertain system with common cause failures based on survival signature.
- Author
-
Mi, Jinhua, Beer, Michael, Li, Yan-Feng, Broggi, Matteo, and Cheng, Yuhua
- Subjects
- *
UNCERTAIN systems , *SYSTEM analysis , *RELIABILITY in engineering , *TELECOMMUNICATION satellites , *EPISTEMIC uncertainty , *FAILURE time data analysis , *REDUNDANCY in engineering , *SYSTEM failures - Abstract
• Possible CCF scenarios are modeled and quantified by decomposed partial α factors. • Uncertainties for CCF events are reduced by hierarchical Bayesian inference method. • Reliability of redundant uncertain system with CCFs is modeled by survival signature. • Importance of components and CCF events are defined and ranked. • The proposed method is effectively used to analyze the reliability of a satellite subsystem. Redundant design has become the commonly used technique for ensuring the reliability of complex systems, which calls for great concern to common cause failure problems in such systems. Incomplete data in combination with vague judgments from experts introduce imprecision and epistemic uncertainties in the performance characterization of components. These issues need to be taken into account for assessing the system reliability. In this paper, a comprehensive reliability assessment method is presented by adopting the concept of survival signature to estimate the reliability of complex systems with multiple types of components. Particular attention is devoted to common cause failures (CCFs), which are modeled and quantified by decomposed partial α-decomposition method. Uncertainties caused by incomplete data for CCF events are reduced by hierarchical Bayesian inference. The component importance measure is enhanced to assess the importance of various possible CCF scenarios and to identify their potential impact on system reliability. The presented method is used to analyze the reliability of a dual-axis pointing mechanism for communication satellite, which is a commonly used satellite antenna control mechanism. The engineering application demonstrates the effectiveness of the method. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
573. Ternary Logic Circuit and Neural Network Integration via Small Molecule-Based Antiambipolar Vertical Electrochemical Transistor.
- Author
-
Deng Z, Yu Y, Zhou Y, Zhou J, Xie M, Tao B, Lai Y, Wen J, Fan Z, Liu X, Zhao D, Feng LW, Cheng Y, Huang CG, Yue W, and Huang W
- Abstract
Circuits based on organic electrochemical transistors (OECTs) have great potential in the fields of biosensors and artificial neural computation due to their biocompatibility and neural similarity. However, the integration of OECT-based circuits lags far behind other emerging electronics. Here, ternary inverters based on antiambipolar vertical OECTs (vOECTs) and their integration with the establishment of neural networks are demonstrated. Specifically, by adopting a small molecule (t-gdiPDI) as the channel of vOECT, high antiambipolar performance, with current density of 33.9 ± 2.1 A cm
-2 under drain voltage of 0.1 V, peak voltage ≈0 V, low driving voltage < ± 0.6 V, and current on/off ratio > 106 , are realized. Consequently, vertically stacked ternary circuits based solely on OECTs are constructed for the first time, showing three distinct logical states and high integration density. By further developing inverter array as the internal fundamental units of ternary weight network hardware circuits for ternary processing and computation, it demonstrates excellent data classification and recognition capabilities. This work demonstrates the possibility of constructing multi-valued logic circuits by OECTs and promotes a new strategy for high-density integration and multivalued computing systems based on organic circuits., (© 2024 Wiley‐VCH GmbH.)- Published
- 2024
- Full Text
- View/download PDF
574. Adaptive adjacent context negotiation network for object detection in remote sensing imagery.
- Author
-
Dong Y, Liu Y, Cheng Y, Gao G, Chen K, and Li C
- Abstract
Accurate localization of objects of interest in remote sensing images (RSIs) is of great significance for object identification, resource management, decision-making and disaster relief response. However, many difficulties, like complex backgrounds, dense target quantities, large-scale variations, and small-scale objects, which make the detection accuracy unsatisfactory. To improve the detection accuracy, we propose an Adaptive Adjacent Context Negotiation Network (A
2 CN-Net). Firstly, the composite fast Fourier convolution (CFFC) module is given to reduce the information loss of small objects, which is inserted into the backbone network to obtain spectral global context information. Then, the Global Context Information Enhancement (GCIE) module is given to capture and aggregate global spatial features, which is beneficial for locating objects of different scales. Furthermore, to alleviate the aliasing effect caused by the fusion of adjacent feature layers, a novel Adaptive Adjacent Context Negotiation network (A2 CN) is given to adaptive integration of multi-level features, which consists of local and adjacent branches, with the local branch adaptively highlighting feature information and the adjacent branch introducing global information at the adjacent level to enhance feature representation. In the meantime, considering the variability in the focus of feature layers in different dimensions, learnable weights are applied to the local and adjacent branches for adaptive feature fusion. Finally, extensive experiments are performed in several available public datasets, including DIOR and DOTA-v1.0. Experimental studies show that A2 CN-Net can significantly boost detection performance, with mAP increasing to 74.2% and 79.2%, respectively., Competing Interests: The authors declare there are no competing interests., (©2024 Dong et al.)- Published
- 2024
- Full Text
- View/download PDF
575. Stretchable Electronics with Strain-Resistive Performance.
- Author
-
Hou S, Chen C, Bai L, Yu J, Cheng Y, and Huang W
- Abstract
Stretchable electronics have attracted tremendous attention amongst academic and industrial communities due to their prospective applications in personal healthcare, human-activity monitoring, artificial skins, wearable displays, human-machine interfaces, etc. Other than mechanical robustness, stable performances under complex strains in these devices that are not for strain sensing are equally important for practical applications. Here, a comprehensive summarization of recent advances in stretchable electronics with strain-resistive performance is presented. First, detailed overviews of intrinsically strain-resistive stretchable materials, including conductors, semiconductors, and insulators, are given. Then, systematic representations of advanced structures, including helical, serpentine, meshy, wrinkled, and kirigami-based structures, for strain-resistive performance are summarized. Next, stretchable arrays and circuits with strain-resistive performance, that integrate multiple functionalities and enable complex behaviors, are introduced. This review presents a detailed overview of recent progress in stretchable electronics with strain-resistive performances and provides a guideline for the future development of stretchable electronics., (© 2023 Wiley-VCH GmbH.)
- Published
- 2024
- Full Text
- View/download PDF
576. Distributed Recursive Filtering Over Sensor Networks Under Random Access Protocol: When State Saturation Meets Censored Measurement.
- Author
-
Geng H, Wang Z, Hu J, Dong H, and Cheng Y
- Abstract
In this article, a new distributed filtering problem is studied for a class of state-saturated time-varying systems over sensor networks under measurement censoring, where the censored measurements are described by the Tobit measurement model. To curb the data collision and ease communication burden, a random access protocol (RAP) is implemented onto the sensor-to-filter channels to orchestrate the transmission sequence of multiple sensor nodes. The purpose of the addressed problem is to construct a state-saturated distributed filter such that upper bounds (on filtering error covariances) are guaranteed and filter parameters are determined to accommodate both measurement censoring and state saturation under the RAP. By means of matrix difference equations, the desired upper bounds are first acquired and later minimized through appropriately designing filter parameters. Particularly, the sparsity issue with respect to the network topology is tackled via the employing certain matrix simplification technique. A simulation example is finally presented to showcase the applicability of the proposed state-saturated distributed filtering algorithm.
- Published
- 2023
- Full Text
- View/download PDF
577. Flexible and Stretchable Organic Electrochemical Transistors for Physiological Sensing Devices.
- Author
-
Yao Y, Huang W, Chen J, Liu X, Bai L, Chen W, Cheng Y, Ping J, Marks TJ, and Facchetti A
- Subjects
- Electronics, Semiconductors, Prostheses and Implants, Engineering, Transistors, Electronic, Wearable Electronic Devices
- Abstract
Flexible and stretchable bioelectronics provides a biocompatible interface between electronics and biological systems and has received tremendous attention for in situ monitoring of various biological systems. Considerable progress in organic electronics has made organic semiconductors, as well as other organic electronic materials, ideal candidates for developing wearable, implantable, and biocompatible electronic circuits due to their potential mechanical compliance and biocompatibility. Organic electrochemical transistors (OECTs), as an emerging class of organic electronic building blocks, exhibit significant advantages in biological sensing due to the ionic nature at the basis of the switching behavior, low driving voltage (<1 V), and high transconductance (in millisiemens range). During the past few years, significant progress in constructing flexible/stretchable OECTs (FSOECTs) for both biochemical and bioelectrical sensors has been reported. In this regard, to summarize major research accomplishments in this emerging field, this review first discusses structure and critical features of FSOECTs, including working principles, materials, and architectural engineering. Next, a wide spectrum of relevant physiological sensing applications, where FSOECTs are the key components, are summarized. Last, major challenges and opportunities for further advancing FSOECT physiological sensors are discussed., (© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.)
- Published
- 2023
- Full Text
- View/download PDF
578. Integrated opposite charge grafting induced ionic-junction fiber.
- Author
-
Xing Y, Zhou M, Si Y, Yang CY, Feng LW, Wu Q, Wang F, Wang X, Huang W, Cheng Y, Zhang R, Duan X, Liu J, Song P, Sun H, Wang H, Zhang J, Jiang S, Zhu M, and Wang G
- Subjects
- Animals, Mice, Ions metabolism, Polyelectrolytes, Sciatic Nerve metabolism, Electronics, Neural Conduction
- Abstract
The emergence of ionic-junction devices has attracted growing interests due to the potential of serving as signal transmission and translation media between electronic devices and biological systems using ions. Among them, fiber-shaped iontronics possesses a great advantage in implantable applications owing to the unique one-dimensional geometry. However, fabricating stable ionic-junction on curved surfaces remains a challenge. Here, we developed a polyelectrolyte based ionic-junction fiber via an integrated opposite charge grafting method capable of large-scale continuous fabrication. The ionic-junction fibers can be integrated into functions such as ionic diodes and ionic bipolar junction transistors, where rectification and switching of input signals are implemented. Moreover, synaptic functionality has also been demonstrated by utilizing the fiber memory capacitance. The connection between the ionic-junction fiber and sciatic nerves of the mouse simulating end-to-side anastomosis is further performed to realize effective nerve signal conduction, verifying the capability for next-generation artificial neural pathways in implantable bioelectronics., (© 2023. The Author(s).)
- Published
- 2023
- Full Text
- View/download PDF
579. High-performance and low-power source-gated transistors enabled by a solution-processed metal oxide homojunction.
- Author
-
Zhuang X, Kim JS, Huang W, Chen Y, Wang G, Chen J, Yao Y, Wang Z, Liu F, Yu J, Cheng Y, Yang Z, Lauhon LJ, Marks TJ, and Facchetti A
- Subjects
- Humans, Silicon Dioxide, Electric Power Supplies, Oxides, Polyethyleneimine, Artificial Intelligence, Automobile Driving
- Abstract
Cost-effective fabrication of mechanically flexible low-power electronics is important for emerging applications including wearable electronics, artificial intelligence, and the Internet of Things. Here, solution-processed source-gated transistors (SGTs) with an unprecedented intrinsic gain of ~2,000, low saturation voltage of +0.8 ± 0.1 V, and a ~25.6 μW power consumption are realized using an indium oxide In
2 O3 /In2 O3 :polyethylenimine (PEI) blend homojunction with Au contacts on Si/SiO2 . Kelvin probe force microscopy confirms source-controlled operation of the SGT and reveals that PEI doping leads to more effective depletion of the reverse-biased Schottky contact source region. Furthermore, using a fluoride-doped AlOx gate dielectric, rigid (on a Si substrate) and flexible (on a polyimide substrate) SGTs were fabricated. These devices exhibit a low driving voltage of +2 V and power consumption of ~11.5 μW, yielding inverters with an outstanding voltage gain of >5,000. Furthermore, electrooculographic (EOG) signal monitoring can now be demonstrated using an SGT inverter, where a ~1.0 mV EOG signal is amplified to over 300 mV, indicating significant potential for applications in wearable medical sensing and human-computer interfacing.- Published
- 2023
- Full Text
- View/download PDF
580. Vertical organic electrochemical transistors for complementary circuits.
- Author
-
Huang W, Chen J, Yao Y, Zheng D, Ji X, Feng LW, Moore D, Glavin NR, Xie M, Chen Y, Pankow RM, Surendran A, Wang Z, Xia Y, Bai L, Rivnay J, Ping J, Guo X, Cheng Y, Marks TJ, and Facchetti A
- Abstract
Organic electrochemical transistors (OECTs) and OECT-based circuitry offer great potential in bioelectronics, wearable electronics and artificial neuromorphic electronics because of their exceptionally low driving voltages (<1 V), low power consumption (<1 µW), high transconductances (>10 mS) and biocompatibility
1-5 . However, the successful realization of critical complementary logic OECTs is currently limited by temporal and/or operational instability, slow redox processes and/or switching, incompatibility with high-density monolithic integration and inferior n-type OECT performance6-8 . Here we demonstrate p- and n-type vertical OECTs with balanced and ultra-high performance by blending redox-active semiconducting polymers with a redox-inactive photocurable and/or photopatternable polymer to form an ion-permeable semiconducting channel, implemented in a simple, scalable vertical architecture that has a dense, impermeable top contact. Footprint current densities exceeding 1 kA cm-2 at less than ±0.7 V, transconductances of 0.2-0.4 S, short transient times of less than 1 ms and ultra-stable switching (>50,000 cycles) are achieved in, to our knowledge, the first vertically stacked complementary vertical OECT logic circuits. This architecture opens many possibilities for fundamental studies of organic semiconductor redox chemistry and physics in nanoscopically confined spaces, without macroscopic electrolyte contact, as well as wearable and implantable device applications., (© 2023. The Author(s).)- Published
- 2023
- Full Text
- View/download PDF
581. Electrochemical biosensors based on saliva electrolytes for rapid detection and diagnosis.
- Author
-
Liu J, Tang Y, Cheng Y, Huang W, and Xiang L
- Subjects
- Humans, SARS-CoV-2, Saliva, Pandemics, Biomarkers, COVID-19 diagnosis, Biosensing Techniques methods
- Abstract
In recent years, electrochemical biosensors (ECBSs) have shown significant potential for real-time disease diagnosis and in situ physical condition monitoring. As a multi-constituent oral fluid comprising various disease signaling biomarkers, saliva has drawn much attention in the field of point-of-care (POC) testing. In particular, during the outbreak of the COVID-19 pandemic, ECBSs which hold the simplicity of a single-step assay compared with the multi-step assay of traditional testing methods are expected to relieve the human and economic burden caused by the massive and long-term sample testing process. Noteworthily, ECBSs for the detection of SARS-CoV-2 in saliva have already been developed and may replace current testing methods. Furthermore, the detection scope has expanded from routine indices such as sugar and uric acid to abnormal biomarkers for early-stage disease detection and drug level monitoring, which further facilitated the evolution of ECBSs in the last 5 years. This review is divided into several main sections. First, we discussed the latest advancements and representative research on ECBSs for saliva testing. Then, we focused on a novel kind of ECBS, organic electrochemical transistors (OECTs), which hold great advantages of high sensitivity and signal-to-noise ratio and on-site detection. Finally, application of ECBSs with integrated portable platforms in oral cavities, which lead to powerful auxiliary testing means for telemedicine, has also been discussed.
- Published
- 2022
- Full Text
- View/download PDF
582. Asynchronous Frequency-Dependent Fault Detection for Nonlinear Markov Jump Systems Under Wireless Fading Channels.
- Author
-
Long Y, Cheng Y, Li T, Bai W, Chen K, and Bai L
- Abstract
In this article, the asynchronous fault detection (FD) strategy is investigated in frequency domain for nonlinear Markov jump systems under fading channels. In order to estimate the system dynamics and meet the fact that not all the running modes can be observed exactly, a set of asynchronous FD filters is proposed. By using statistical methods and the Lynapunov stability theory, the augmented system is shown to be stochastic stable with a prescribed l
2 gain even under fading transmissions. Then, a novel lemma is developed to capture the finite frequency performance. Some solvable conditions with less conservatism are subsequently deduced by exploiting novel decoupling techniques and additional slack variables. Besides, the FD filter gains could be calculated with the aid of the derived conditions. Finally, the effectiveness of the proposed method is shown by an illustrative example.- Published
- 2022
- Full Text
- View/download PDF
583. Readily Accessible Metallic Micro-Island Arrays for High-Performance Metal Oxide Thin-Film Transistors.
- Author
-
Kim J, Park JB, Zheng D, Kim JS, Cheng Y, Park SK, Huang W, Marks TJ, and Facchetti A
- Abstract
Thin-film transistors using metal oxide semiconductors are essential in many unconventional electronic devices. Nevertheless, further advances will be necessary to broaden their technological appeal. Here, a new strategy is reported to achieve high-performance solution-processed metal oxide thin-film transistors (MOTFTs) by introducing a metallic micro-island array (M-MIA) on top of the MO back channel, where the MO is a-IGZO (amorphous indium-gallium-zinc-oxide). Here Al-MIAs are fabricated using honeycomb cinnamate cellulose films, created by a scalable breath-figure method, as a shadow mask. For IGZO TFTs, the electron mobility (µ
e ) increases from ≈3.6 cm2 V-1 s-1 to near 15.6 cm2 V-1 s-1 for optimal Al-MIA dimension/coverage of 1.25 µm/51%. The Al-MIA IGZO TFT performance is superior to that of controls using compact/planar Al layers (Al-PL TFTs) and Au-MIAs with the same channel coverage. Kelvin probe force microscopy and technology computer-aided design simulations reveal that charge transfer occurs between the Al and the IGZO channel which is optimized for specific Al-MIA dimensions/surface channel coverages. Furthermore, such Al-MIA IGZO TFTs with a high-k fluoride-doped alumina dielectric exhibit a maximum µe of >50.2 cm2 V-1 s-1 . This is the first demonstration of a micro-structured MO semiconductor heterojunction with submicrometer resolution metallic arrays for enhanced transistor performance and broad applicability to other devices., (© 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH.)- Published
- 2022
- Full Text
- View/download PDF
584. Asynchronous Tracking Control of Leader-Follower Multiagent Systems With Input Uncertainties Over Switching Signed Digraphs.
- Author
-
Shao J, Shi L, Cheng Y, and Li T
- Abstract
Signed digraphs with both positive and negative weighted edges are widely applied to explain cooperative and competitive interactions arising from various social, biological, and physical systems. This article formulates and solves the asynchronous tracking control problem of multiagent systems with input uncertainties on switching signed digraphs. In the interaction setting, we assume that the leader moves at a time-varying acceleration that cannot be measured by the followers accurately, and further suppose that each agent receives its neighbors' states information at certain instants determined by its own clock, which is not necessary to be synchronized with those of other agents. Using dynamically changing spanning subdigraphs of signed digraphs to describe graphically asynchronous interactions, the asynchronous tracking problem is equivalently transformed into a convergence problem of products of general substochastic matrices (PGSSM), in which the matrix elements are not necessarily non-negative and the row sums are less than or equal to 1. With the help of the matrix analysis technique and the composition of binary relations, we propose a new and original method to deal with the convergence problem of PGSSM, and further establish a spanning tree condition for asynchronous tracking control. Finally, the validity of the theoretical findings is verified through several numerical examples.
- Published
- 2022
- Full Text
- View/download PDF
585. Seeking Tracking Consensus for General Linear Multiagent Systems With Fixed and Switching Signed Networks.
- Author
-
Cheng Y, Shi L, Shao J, and Zheng WX
- Subjects
- Algorithms, Computer Simulation, Consensus, Models, Theoretical, Nonlinear Dynamics
- Abstract
The existing studies for tracking consensus of multiagent systems (MASs) are all restricted to networks with only cooperative relationships among agents. Tracking consensus, however, requires beyond these traditional models due to the ubiquitous competition in many real-world MASs, such as biological systems and social systems. Taking into account this fact, this article aims to extend the dynamics of tracking consensus to signed networks containing both cooperative and competitive relationships among agents. A group of agents with general linear dynamics is considered. The cases of the fixed network as well as switching networks are analyzed, respectively. In the end, some algebraic conditions related to the network structure and the positive/negative edge weight are established to ensure the implementation of tracking consensus. Moreover, the single decoupling system is allowed to be strictly unstable in theory, and the upper bound of the eigenvalue modulus of the system matrix related to the system instability is given.
- Published
- 2022
- Full Text
- View/download PDF
586. Highly stretchable organic electrochemical transistors with strain-resistant performance.
- Author
-
Chen J, Huang W, Zheng D, Xie Z, Zhuang X, Zhao D, Chen Y, Su N, Chen H, Pankow RM, Gao Z, Yu J, Guo X, Cheng Y, Strzalka J, Yu X, Marks TJ, and Facchetti A
- Subjects
- Polymers chemistry, Semiconductors, Thiophenes chemistry, Electronics, Transistors, Electronic
- Abstract
Realizing fully stretchable electronic materials is central to advancing new types of mechanically agile and skin-integrable optoelectronic device technologies. Here we demonstrate a materials design concept combining an organic semiconductor film with a honeycomb porous structure with biaxially prestretched platform that enables high-performance organic electrochemical transistors with a charge transport stability over 30-140% tensional strain, limited only by metal contact fatigue. The prestretched honeycomb semiconductor channel of donor-acceptor polymer poly(2,5-bis(2-octyldodecyl)-3,6-di(thiophen-2-yl)-2,5-diketo-pyrrolopyrrole-alt-2,5-bis(3-triethyleneglycoloxy-thiophen-2-yl) exhibits high ion uptake and completely stable electrochemical and mechanical properties over 1,500 redox cycles with 10
4 stretching cycles under 30% strain. Invariant electrocardiogram recording cycles and synapse responses under varying strains, along with mechanical finite element analysis, underscore that the present stretchable organic electrochemical transistor design strategy is suitable for diverse applications requiring stable signal output under deformation with low power dissipation and mechanical robustness., (© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)- Published
- 2022
- Full Text
- View/download PDF
587. Bipartite Tracking Consensus of Generic Linear Agents With Discrete-Time Dynamics Over Cooperation-Competition Networks.
- Author
-
Shao J, Zheng WX, Shi L, and Cheng Y
- Abstract
This article addresses the bipartite tracking consensus for a set of mobile autonomous agents over directed cooperation-competition networks. Here, cooperative and competitive interactions among the agents are described by positive and negative edges of the directed network topology, respectively. Both fixed and switching network topologies are considered. For the case with fixed network topology, the matrix product technique is utilized to derive the convergence result. For the case with switching network topologies, some key results related to the composition of binary relations are the main technical tools of analyzing the error system. In addition, the upper bound for the spectral radius of the system matrix is given to ensure the convergence of the system even if the single uncoupled system is strictly unstable. The applicability of the derived results is verified through two simulation experiments.
- Published
- 2021
- Full Text
- View/download PDF
588. A coefficient-free and continuous blood pressure estimation method based on the arterial lumen area model.
- Author
-
Ma S, Wang G, Li L, and Cheng Y
- Subjects
- Arteries, Artifacts, Female, Humans, Male, Middle Aged, Young Adult, Arterial Pressure physiology, Blood Pressure physiology, Blood Pressure Determination methods, Oscillometry methods
- Abstract
Oscillometry is the most popular technique for automatic blood pressure (BP) estimation. This method relies on recording the cuff deflation curve (CDC) from a high suprasystolic BP (SSBP) to a low subdiastolic BP (SDBP) and is very sensitive to noise caused by breathing, motion artifacts, muscle contraction and the environment. We developed a unified BP estimation method involving two integrated sub-procedures based on the arterial lumen area (ALA) model and applied it for continuous BP measurement. Our proposed method is coefficient free and continuous. No empirical coefficients are applied, and the CDC varies within a low-pressure range of 40-80 mm Hg, which can be sustainably imposed on our wrists. The first sub-procedure estimates the mean arterial pressure (MAP) and arterial compliance parameter b under a complete CDC period. In the second sub-procedure, the systolic BP (SBP) and diastolic BP (DBP) are estimated based on the dynamic-updated oscillometric waveform. We applied this method on 300 continuously oscillometric traces recorded from 20 male and female healthy subjects aged 20-60 years. The validated results were compared with those from a double stethoscope check. We observed mean absolute errors of 4.77 and 4.24 mm Hg in estimating the SBP and DBP, respectively.
- Published
- 2019
- Full Text
- View/download PDF
589. Chip-Scale Coils for Millimeter-Sized Bio-Implants.
- Author
-
Feng P, Yeon P, Cheng Y, Ghovanloo M, and Constandinou TG
- Subjects
- Animals, Ribs physiology, Sheep, Transistors, Electronic, Wireless Technology, Equipment and Supplies, Prostheses and Implants
- Abstract
Next generation implantable neural interfaces are targeting devices with mm-scale form factors that are freely floating and completely wireless. Scalability to more recording (or stimulation) channels will be achieved through distributing multiple devices, instead of the current approach that uses a single centralized implant wired to individual electrodes or arrays. In this way, challenges associated with tethers, micromotion, and reliability of wiring is mitigated. This concept is now being applied to both central and peripheral nervous system interfaces. One key requirement, however, is to maximize specific absorption rate (SAR) constrained achievable wireless power transfer efficiency (PTE) of these inductive links with mm-sized receivers. Chip-scale coil structures for microsystem integration that can provide efficient near-field coupling are investigated. We develop near-optimal geometries for three specific coil structures: in-CMOS, above-CMOS (planar coil post-fabricated on a substrate), and around-CMOS (helical wirewound coil around substrate). We develop analytical and simulation models that have been validated in air and biological tissues by fabrications and experimental measurements. Specifically, we prototype structures that are constrained to a 4 mm 4 mm silicon substrate, i.e., the planar in-/above-CMOS coils have outer diameters 4 mm, whereas the around-CMOS coil has an inner diameter of 4 mm. The in-CMOS and above-CMOS coils have metal film thicknesses of 3- m aluminium and 25- m gold, respectively, whereas the around-CMOS coil is fabricated by winding a 25-m gold bonding wire around the substrate. The measured quality factors (Q) of the mm-scale Rx coils are 10.5 @450.3 MHz (in-CMOS), 24.61 @85 MHz (above-CMOS), and 26.23 @283 MHz (around-CMOS). Also, PTE of 2-coil links based on three types of chip-scale coils is measured in air and tissue environment to demonstrate tissue loss for bio-implants. The SAR-constrained maximum PTE measured (together with resonant frequencies, in tissue) are 1.64% @355.8 MHz (in-CMOS), 2.09% @82.9 MHz (above-CMOS), and 3.05% @318.8 MHz (around-CMOS).
- Published
- 2018
- Full Text
- View/download PDF
590. Improvement of the grid-connect current quality using novel proportional-integral controller for photovoltaic inverters.
- Author
-
Cheng Y, Chen K, Bai L, and Yang J
- Abstract
Precise control of the grid-connected current is a challenge in photovoltaic inverter research. Traditional Proportional-Integral (PI) control technology cannot eliminate steady-state error when tracking the sinusoidal signal from the grid, which results in a very high total harmonic distortion in the grid-connected current. A novel PI controller has been developed in this paper, in which the sinusoidal wave is discretized into an N-step input signal that is decided by the control frequency to eliminate the steady state error of the system. The effect of periodical error caused by the dead zone of the power switch and conduction voltage drop can be avoided; the current tracking accuracy and current harmonic content can also be improved. Based on the proposed PI controller, a 700 W photovoltaic grid-connected inverter is developed and validated. The improvement has been demonstrated through experimental results.
- Published
- 2014
- Full Text
- View/download PDF
591. Similarities and differences in interaction of K+ and Na+ with condensed ordered DNA. A molecular dynamics computer simulation study.
- Author
-
Cheng Y, Korolev N, and Nordenskiöld L
- Subjects
- Base Pairing, Cations chemistry, Computer Simulation, Diffusion, Nucleic Acid Conformation, Phosphates chemistry, Water chemistry, DNA chemistry, Models, Molecular, Potassium chemistry, Sodium chemistry
- Abstract
Four 20 ns molecular dynamics simulations have been performed with two counterions, K+ or Na+, at two water contents, 15 or 20 H2O per nucleotide. A hexagonal simulation cell comprised of three identical DNA decamers [d(5'-ATGCAGTCAG) x d(5'-TGACTGCATC)] with periodic boundary condition along the DNA helix was used. The simulation setup mimics the DNA state in oriented DNA fibers or in crystals of DNA oligomers. Variation of counterion nature and water content do not alter averaged DNA structure. K+ and Na+ binding to DNA are different. K+ binds to the electronegative sites of DNA bases in the major and the minor grooves, while Na+ interacts preferentially with the phosphate groups. Increase of water causes a shift of both K+ and Na+ from the first hydration shell of O1P/O2P and of the DNA bases in the minor groove with lesser influence for the cation binding to the bases in the major groove. Mobility of both water and cations in the K-DNA systems is faster than in the Na-DNA systems: Na+ organizes and immobilizes water structure around itself and near DNA while for K+ water is less organized and more dynamic.
- Published
- 2006
- Full Text
- View/download PDF
592. Computational study on the function of water within a beta-helix antifreeze protein dimer and in the process of ice-protein binding.
- Author
-
Yang Z, Zhou Y, Liu K, Cheng Y, Liu R, Chen G, and Jia Z
- Subjects
- Animals, Binding Sites, Computer Simulation, Dimerization, Macromolecular Substances, Protein Binding, Protein Conformation, Protein Structure, Secondary, Solutions, Structure-Activity Relationship, Tenebrio metabolism, Antifreeze Proteins chemistry, Energy Transfer, Ice, Models, Chemical, Models, Molecular, Water chemistry
- Abstract
Antifreeze proteins (AFPs) help many organisms protect themselves from freezing in subzero temperatures. The most active AFPs found to date are those from insects, which possess exceptionally regular beta-helical structures. On the ice-binding surface of these proteins, regularly arrayed water molecules are observed within the repeating Thr-Xxx-Thr motif, but the exact role of these water molecules remains unknown. In this work, we have employed a number of computational methods to examine the role of these water molecules in an AFP from Tenebrio molitor (TmAFP). Our investigation involved a combination of molecular and quantum mechanical approaches. Properties such as stability, interaction energy, orbital overlap, and conformational analysis of various systems, including TmAFP-water, TmAFP-water-ice, and TmAFP-ice, were systematically evaluated and compared. The regularly arrayed water molecules were found to remain associated with TmAFP before ice binding, demonstrating that they are an intrinsic part of the protein. These water molecules may assist TmAFP in the process of ice recognition and binding. However, after facilitating the initial stages of ice recognition and binding, these water molecules are excluded in the final formation of the AFP-ice complex. The departure of these water molecules enables a better two-dimensional match between TmAFP and ice. These results agree with experimental observations showing that although these water molecules are aligned with the ice-binding hydroxyl groups of Thr residues in one dimension, they are in fact positioned slightly off in the second dimension, making a good two-dimensional match impossible.
- Published
- 2003
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.