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Journal articles on the topic 'High Order Differentiator (HOD)'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Qi, Guoyuan, Shengli Ma, Xitong Guo, Xia Li, and Jianchuan Guo. "High-Order Differential Feedback Control for Quadrotor UAV: Theory and Experimentation." Electronics 9, no. 12 (2020): 2001. http://dx.doi.org/10.3390/electronics9122001.

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A model-independent control strategy called high-order differential feedback control (HODFC) is applied to a quadrotor unmanned aerial vehicle (QUAV) based on a semi-autopilot indoor optical positioning system. The affine system form of the quadrotor model is provided to facilitate the design of the HODFC. A fifth-order high order differentiator (HOD) is introduced to estimate with high precision the derivatives of the reference input and the QUAV system’s states. A filtering signal of the control output is incorporated in the control law to overcome the system model’s unknown part in the HODF

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2

Wang, Xinhua, and Bijan Shirinzadeh. "High-order nonlinear differentiator and application to aircraft control." Mechanical Systems and Signal Processing 46, no. 2 (2014): 227–52. http://dx.doi.org/10.1016/j.ymssp.2014.02.003.

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Swarnakar, Jaydeep, Prasanta Sarkar, and Lairenlakpam Joyprakash Singh. "A unified direct approach for discretizing fractional-order differentiator in delta-domain." International Journal of Modeling, Simulation, and Scientific Computing 09, no. 06 (2018): 1850055. http://dx.doi.org/10.1142/s1793962318500551.

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Fractional-order differentiator is a principal component of the fractional-order controller. Discretization of fractional-order differentiator is essential to implement the fractional-order controller digitally. Discretization methods generally include indirect approach and direct approach to find the discrete-time approximation of fractional-order differentiator in the [Formula: see text]-domain as evident from the existing literature. In this paper, a direct approach is proposed for discretization of fractional-order differentiator in delta-domain instead of the conventional [Formula: see te

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Dong, Jianji, Aoling Zheng, Dingshan Gao, et al. "High-order photonic differentiator employing on-chip cascaded microring resonators." Optics Letters 38, no. 5 (2013): 628. http://dx.doi.org/10.1364/ol.38.000628.

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Wen, Jin, Lina Duan, and Wei Fan. "Influences of pump power and high-order dispersion on dual-pumped silicon-on-insulator micro-ring resonator-based optical frequency combs." Modern Physics Letters B 33, no. 10 (2019): 1950117. http://dx.doi.org/10.1142/s0217984919501173.

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We numerically investigate the effects of pump power and high-order dispersion (HOD) on the generation and evolution of silicon-on-insulator (SOI) micro-ring resonator-based optical frequency combs (OFCs). The observed bandwidth and number of comb modes increase as the pump power enhances, which demonstrates the pump power as low as 0 dBm is required to initiate in the dual-pumped scheme, while the optimized pump power distribution ratio is around 0.5. The HOD can also be introduced to analyze the nonlinear symmetry breaking of the OFC, especially the sign and amplitude of the third-order disp

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Leballo, Makatleho, Dominic Griffiths, and Tanya Bekker. "Differentiation practices in a private and government high school classroom in Lesotho: Evaluating teacher responses." South African Journal of Education 41, no. 1 (2021): 1–13. http://dx.doi.org/10.15700/saje.v41n1a1835.

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One way in which the practice of inclusion can be actualised in classrooms is through the use of consistent, appropriate differentiated instruction. What remains elusive, however, is insight into what teachers in different contexts think and believe about differentiation, how consistently they differentiate instruction and what challenges they experience in doing so. In the study reported on here high school classrooms in a private and a government school in Lesotho were compared in order to determine teachers’ thoughts and beliefs about differentiation, the frequency of differentiated instruc

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Barbot, Jean-Pierre, Driss Boutat, Krishna Busawon, and Mangal Kothari. "High Order Sliding Mode Differentiator for Dynamical Inversion of Non-Involutive Systems." IFAC Proceedings Volumes 47, no. 3 (2014): 9159–64. http://dx.doi.org/10.3182/20140824-6-za-1003.01215.

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Mohan, G. S. S. S. S. V. Krishna, and Yarravarapu Srinivasa Rao. "An efficient design of finite impulse response — Fractional-order differentiator using shuffled frog leaping algorithm heuristic." International Journal of Wavelets, Multiresolution and Information Processing 18, no. 01 (2019): 1941005. http://dx.doi.org/10.1142/s0219691319410054.

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A fractional-order digital differentiator is employed for the calculation of a time-derivative of the applied signal. In the recent few decades, this particular concept of a fractional derivative has been gaining a lot of attention in various applications concerning engineering, technology and science that includes image processing along with automatic control. Once there has been an effective use for this continuous-time Fractional-Order Differentiator (FOD), the trend in its research is primarily toward using a discrete-time fractional differentiator. All these conventional techniques tend t

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9

Smaoui, M., X. Brun, and D. Thomasset. "High-order sliding mode for an electropneumatic system: A robust differentiator–controller design." International Journal of Robust and Nonlinear Control 18, no. 4-5 (2008): 481–501. http://dx.doi.org/10.1002/rnc.1235.

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10

Wu, Zhonghua, Jingchao Lu, Jahanzeb Rajput, Jingping Shi, and Wen Ma. "Adaptive Neural Control Based on High Order Integral Chained Differentiator for Morphing Aircraft." Mathematical Problems in Engineering 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/787931.

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This paper presents an adaptive neural control for the longitudinal dynamics of a morphing aircraft. Based on the functional decomposition, it is reasonable to decompose the longitudinal dynamics into velocity and altitude subsystems. As for the velocity subsystem, the adaptive control is proposed via dynamic inversion method using neural network. To deal with input constraints, the additional compensation system is employed to help engine recover from input saturation rapidly. The highlight is that high order integral chained differentiator is used to estimate the newly defined variables and

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11

You, Haidong, Tigang Ning, Jing Li, Wei Jian, Xiaodong Wen, and Li Pei. "Design and performance analysis of high-order optical temporal differentiator with twin-core fiber." Optical Engineering 52, no. 8 (2013): 086101. http://dx.doi.org/10.1117/1.oe.52.8.086101.

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12

Bejarano, Francisco Javier, Maricela Figueroa, Jaime Pacheco, and José de Jesus Rubio. "Robust fault diagnosis of disturbed linear systems via a sliding mode high order differentiator." International Journal of Control 85, no. 6 (2012): 648–59. http://dx.doi.org/10.1080/00207179.2012.661463.

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13

Prommee, Pipat, Natapong Wongprommoon, Montree Kumngern, and Winai Jaikla. "Low-Voltage Low-Pass and Band-Pass Elliptic Filters Based on Log-Domain Approach Suitable for Biosensors." Sensors 19, no. 24 (2019): 5581. http://dx.doi.org/10.3390/s19245581.

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This research proposes bipolar junction transistor (BJT)-based log-domain high-order elliptic ladder low-pass (LPF) and band-pass filters (BPF) using a lossless differentiator and lossless and lossy integrators. The log-domain lossless differentiator was realized by using seven BJTs and one grounded capacitor, the lossy integrator using five BJTs and one grounded capacitor, and the lossless integrator using seven BJTs and one grounded capacitor. The simplified signal flow graph (SFG) of the elliptic ladder LPF consisted of two lossy integrators, one lossless integrator, and one lossless differ

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14

Min, Wan, Tian Qinglan, Sun Chuanhong, and Yi Xiuyuan. "The Design of Robotic Arm Adaptive Fuzzy Controller Based on Oscillator and Differentiator." International Journal of Online and Biomedical Engineering (iJOE) 15, no. 05 (2019): 47. http://dx.doi.org/10.3991/ijoe.v15i05.8895.

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<p class="AbstractText">State variables are acquired when tracking the trace of the robotic arm with adaptive fuzzy controller. Since some variables are difficult to or cannot be measured directly, we introduced the second order oscillator and the second order differentiator that converges in finite time to obtain the value of each state variable. In this paper, a model based on the dynamics analysis of robotic arm was build to design the second order oscillator and the second order differentiator that converges in finite time to obtain the value of each state variable. The designed adap

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15

Wang, Hongwei, Wei Zhang, Junyi Zuo, and Heping Wang. "Frequency and Offset Online Estimation of Sinusoidal Signals Based on High-Order Nonlinear Continuous Differentiator." Chinese Journal of Electronics 26, no. 3 (2017): 579–84. http://dx.doi.org/10.1049/cje.2017.01.007.

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16

Singh, K. K., M. K. Bajpai, and R. K. Pandey. "A NOVEL APPROACH FOR EDGE DETECTION OF LOW CONTRAST SATELLITE IMAGES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-3/W2 (March 10, 2015): 211–17. http://dx.doi.org/10.5194/isprsarchives-xl-3-w2-211-2015.

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Discrimination between texture edges and geometrical edges is very difficult in low contrast images. Satellite images are low contrast images. It is important to extract the edges that are not clearly visible in case of Satellite images. The present work encompasses a new edge detection algorithm using newly constructed differentiator. Chebyshev polynomial based fractional order differentiator has been used for filtering operation on an image. High pass and Low pass filters are designed with the concept of Quadrature Mirror Filter (QMF). Pre-processing has been performed by using this filter.

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17

Bhargav, Avireni, and Jitendra Kumar Saini. "A Novel Simple Differentiator Circuit Based on Carbon Nano Tube Field Effect Transistors Voltage Difference Transconductance Amplifier." Micro and Nanosystems 11, no. 2 (2019): 133–41. http://dx.doi.org/10.2174/1876402911666190527085225.

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: This paper brings in a new design, namely, voltage mode differentiator with an active element, Carbon Nanotube Field Effect Transistors Voltage Difference Transconductance Amplifier (CNVDTA). The circuit thus proposed needs one Carbon Nanotube Field Effect Transistors Voltage Difference Transconductance Amplifier (CNVDTA) element and a single capacitor. While fabricating IC’s in VLSI design, the proposed circuit proves more adaptable and applicable with the anticipated results. Methods: The proposed CNVDTA based voltage mode differentiator in CNFET technology was simulated at 32 nm at a volt

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18

Wang, Yexing, Humin Lei, Jikun Ye, and Xiangwei Bu. "Backstepping Sliding Mode Control for Radar Seeker Servo System Considering Guidance and Control System." Sensors 18, no. 9 (2018): 2927. http://dx.doi.org/10.3390/s18092927.

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This paper investigates the design of a missile seeker servo system combined with a guidance and control system. Firstly, a complete model containing a missile seeker servo system, missile guidance system, and missile control system (SGCS) was creatively proposed. Secondly, a designed high-order tracking differentiator (HTD) was used to estimate states of systems in real time, which guarantees the feasibility of the designed algorithm. To guarantee tracking precision and robustness, backstepping sliding-mode control was adopted. Aiming at the main problem of projectile motion disturbance, an a

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19

Huangfu, Yigeng, Shengrong Zhuo, Akshay Rathore, Elena Breaz, Babak Nahid-Mobarakeh, and Fei Gao. "Super-Twisting Differentiator-Based High Order Sliding Mode Voltage Control Design for DC-DC Buck Converters." Energies 9, no. 7 (2016): 494. http://dx.doi.org/10.3390/en9070494.

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20

Chen, Weitian, and Mehrdad Saif. "Actuator fault diagnosis for uncertain linear systems using a high-order sliding-mode robust differentiator (HOSMRD)." International Journal of Robust and Nonlinear Control 18, no. 4-5 (2008): 413–26. http://dx.doi.org/10.1002/rnc.1201.

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21

Zhang, Liang, Jiayang Wu, Xi Yin, et al. "A High-Speed Second-Order Photonic Differentiator Based on Two-Stage Silicon Self-Coupled Optical Waveguide." IEEE Photonics Journal 6, no. 2 (2014): 1–5. http://dx.doi.org/10.1109/jphot.2014.2302806.

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22

Song, Chunlin, Changzhu Wei, Feng Yang, and Naigang Cui. "High-Order Sliding Mode-Based Fixed-Time Active Disturbance Rejection Control for Quadrotor Attitude System." Electronics 7, no. 12 (2018): 357. http://dx.doi.org/10.3390/electronics7120357.

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This article presents a fixed-time active disturbance rejection control approach for the attitude control problem of quadrotor unmanned aerial vehicle in the presence of dynamic wind, mass eccentricity and an actuator fault. The control scheme applies the feedback linearization technique and enhances the performance of the traditional active disturbance rejection control (ADRC) based on the fixed-time high-order sliding mode method. A switching-type uniformly convergent differentiator is used to improve the extended state observer for estimating and attenuating the lumped disturbance more accu

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23

Yu, Wan Neng, Su Wen Li, and Min Ying Zheng. "The Filtering Mechanism Modeling and Simulation of Passive Power Filter Based on Differentiator Circuit." Advanced Materials Research 430-432 (January 2012): 1593–96. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1593.

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Traditional continuous-time filters are of integer order which the power loss of passive power filter is general very much. However, using fractional calculus, filters may also be represented by the more general fractional-order differential equations. In this work, firstly, the passive elements were described with fractional-order differential equations depending on the introduction of fractional calculus application research. Secondly, the mathematical model of fractional-order filters was derived and discussed which includes high impedance at a certain frequency and low impedance at others,

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24

Park, Jang-Hyun, Tae-Sik Park, and Seong-Hwan Kim. "Approximation-Free Output-Feedback Non-Backstepping Controller for Uncertain SISO Nonautonomous Nonlinear Pure-Feedback Systems." Mathematics 7, no. 5 (2019): 456. http://dx.doi.org/10.3390/math7050456.

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A novel differentiator-based approximation-free output-feedback controller for uncertain nonautonomous nonlinear pure-feedback systems is proposed. Using high-order sliding mode observer, which is a finite-time exact differentiator, the time-derivatives of the signal generated using tracking error and filtered input are directly estimated. As a result, the proposed non-backstepping control law and stability analysis are drastically simple. The tracking error vector is guaranteed to be exponentially stable in finite time regardless of the nonautonomous property in the considered system. It does

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25

Chen, Kang, Bin Fu, Yuening Ding, and Jie Yan. "Integrated Guidance and Control Method for the Interception of Maneuvering Hypersonic Vehicle Based on High Order Sliding Mode Approach." Mathematical Problems in Engineering 2015 (2015): 1–19. http://dx.doi.org/10.1155/2015/648231.

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This paper focuses on the integrated guidance and control (IGC) method applied in the interception of maneuvering near space hypersonic vehicles using the homogeneous high order sliding mode (HOSM) approach. The IGC model is derived by combining the target-missile relative motion and dynamic equations. Then, a fourth-order sliding mode controller is implemented in the augmented IGC model. To estimate the high order derivatives of the sliding manifold which is required in the HOSM method, an Arbitrary Order Robust Exact Differentiator is presented. At last, the idea of virtual control is introd

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26

Chen, Weitian, Qing Wu, Esmaeil Tafazzoli, and Mehrdad Saif. "Actuator Fault Diagnosis Using High-Order Sliding Mode Differentiator (HOSMD) and Its Application to a Laboratory 3D Crane." IFAC Proceedings Volumes 41, no. 2 (2008): 4809–14. http://dx.doi.org/10.3182/20080706-5-kr-1001.00808.

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27

Vrangel Robles, Horderlin, Valentin Molina, Luis Martinez, and Hermann Davila. "EVALUATION AND COMPARISON USING ACTIVITY SIGNALS OF SPEECH METHODS IN RIVER PLATE SPANISH USING BEPPA CORPUS." Revista de Investigaciones Universidad del Quindío 28, no. 1 (2016): 138–44. http://dx.doi.org/10.33975/riuq.vol28n1.43.

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The results obtained after comparing several algorithms which use basic methods of signal processing for speech activity detection of voice or VAD (Voice Activity Detection-VAD), were assessed in order to determine their effectiveness. The algorithms presented in this article are short-time or spectral energy based endpoint detection algorithm, the zero crossing rate method, and the higher order differential (High Order Difference, HOD) method. First, an introduction of the concept of VAD is presented and the need to apply such language algorithms in River Plate is Spanish. Then a summary of t

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28

Mien, Van, Hee-Jun Kang, and Kyoo-Sik Shin. "Adaptive fuzzy quasi-continuous high-order sliding mode controller for output feedback tracking control of robot manipulators." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 1 (2013): 90–107. http://dx.doi.org/10.1177/0954406213490465.

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This article develops a new output feedback tracking control scheme for uncertain robot manipulators with only position measurements. Unlike the conventional sliding mode controller, a quasi-continuous second-order sliding mode controller (QC2C) is first designed. Although the QC2C produces continuous control and less chattering than conventional sliding mode and other high-order sliding mode controllers, chattering exists when the sliding manifold is defined by the equation [Formula: see text]. To alleviate the chattering, an adaptive fuzzy QC2C (FQC2C) is designed, in which the fuzzy system

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29

Yuan, Dong, Xiao Jun Ma, and Wei Wei. "Multimode Adaptive Control for Tank Gun Control System Based on Tracking Differentiator." Advanced Materials Research 383-390 (November 2011): 79–85. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.79.

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Aiming at the problems such as switch impulsion, insurmountability for influence caused by nonlinearity in one tank gun control system which adopts double PID controller to realize the multimode switch control between high speed and low speed movement, the system math model is built up; And then, Model Reference Adaptive Control (MRAC) method based on nonroutine reference model is brought in and the adaptive gun controller is designed. Consequently, the compensation of nonlinearity and multimode control are implemented. Furthermore, the Tracking Differentiator (TD) is affiliated to the front o

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Bu, Xiangwei, Xiaoyan Wu, Mingyan Tian, Jiaqi Huang, Rui Zhang, and Zhen Ma. "High-order tracking differentiator based adaptive neural control of a flexible air-breathing hypersonic vehicle subject to actuators constraints." ISA Transactions 58 (September 2015): 237–47. http://dx.doi.org/10.1016/j.isatra.2015.06.004.

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31

Jalab, Hamid A., and Rabha W. Ibrahim. "Texture Enhancement Based on the Savitzky-Golay Fractional Differential Operator." Mathematical Problems in Engineering 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/149289.

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Texture enhancement for digital images is the most important technique in image processing. The purpose of this paper is to design a texture enhancement technique using fractional order Savitzky-Golay differentiator, which leads to generalizing the Savitzky-Golay filter in the sense of the Srivastava-Owa fractional operators. By employing this generalized fractional filter, texture enhancement is introduced. Consequently, it calculates the generalized fractional order derivative of the given image using the sliding weight window over the image. Experimental results show that the operator can e

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32

Niu, Hailong, Qinhe Gao, Zhihao Liu, Shengjin Tang, and Wenliang Guan. "Improved Linear Active Disturbance Rejection Control for Lever-Type Electric Erection System with Varying Loads and Low-Resolution Encoder." Mathematical Problems in Engineering 2019 (January 17, 2019): 1–13. http://dx.doi.org/10.1155/2019/9867467.

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The lever-type electric erection system is a novel kind of erection system and the experimental platform in this paper operates with varying loads and low-resolution encoder. For high accuracy trajectory tracking, linear active disturbance rejection control (LADRC) is introduced. An approximate model, consisting of the servo system configured at velocity control mode and the lever-type erection mechanism, is built by means of system identification and curve fitting. Reduced-order LADRC based on the further simplified model is proposed to improve tracking accuracy and robustness. As comparisons

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33

Barrett, Natasha. "A Musical Journey towards Permanent High-Density Loudspeaker Arrays." Computer Music Journal 40, no. 4 (2016): 35–46. http://dx.doi.org/10.1162/comj_a_00381.

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Historically, most acousmatic works were composed in stereo and performed, or “diffused”, over loudspeaker orchestras. These systems furnished performers and composers with a wealth of opportunities to enhance the spatial contrast, motion, and musical articulations latent in the music. Although loudspeaker orchestras, stereo diffusion, and—more recently—hybrid performance techniques remain alive, especially in Europe, there is a trend towards fixed installation, high-density loudspeaker arrays (HDLAs), which I will call permanent HDLAs to differentiate them from loudspeaker-orchestra HDLAs. Pe

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Van, Mien, Hee-Jun Kang, and Kyoo-Sik Shin. "Novel quasi-continuous super-twisting high-order sliding mode controllers for output feedback tracking control of robot manipulators." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 17 (2014): 3240–57. http://dx.doi.org/10.1177/0954406214526828.

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In this paper, a robust output feedback tracking control scheme for uncertain robot manipulators with only position measurements is investigated. First, a quasi-continuous second-order sliding mode (QC2S)-based exact differentiator and super-twisting second-order sliding mode (STW2S) controllers are designed to guarantee finite time convergence. Although the QC2S produces continuous control and less chattering than that of a conventional sliding mode controller and other high-order sliding mode controllers, a large amount of chattering exists when the sliding manifold is defined by the equatio

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35

Bionaz, M., C. R. Ferreira, E. Monaco, R. G. Cooks, and M. B. Wheeler. "291 THE USE OF THE DYNAMIC IMPACT APPROACH AND DESORPTION ELECTROSPRAY IONIZATION - MASS SPECTROSCOPY TO ANALYZE ADIPOGENESIS IN PORCINE ADIPOSE-DERIVED STEM CELLS." Reproduction, Fertility and Development 25, no. 1 (2013): 293. http://dx.doi.org/10.1071/rdv25n1ab291.

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The measurement of end products of metabolism in combination with the dynamic measurement of the transcriptome can be a valuable approach to study complex processes, such as adipogenesis. For this purpose, we have combined the analysis of metabolic pathways using transcriptomics data with in situ lipid imaging obtained by desorption electrospray ionization–mass spectroscopy (DESI-MS). The transcriptome data was obtained from a previous experiment where adipose-derived stem cells (ASC) from 3 individual pigs were induced to differentiate into adipocytes for 21 days. The metabolic pathway analys

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Komanaplli, Gurumurthy, Neeta Pandey, and Rajeshwari Pandey. "New Realization of Quadrature Oscillator using OTRA." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 4 (2017): 1815. http://dx.doi.org/10.11591/ijece.v7i4.pp1815-1823.

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In this paper a new, operational transresistance amplifier (OTRA) based, third order quadrature oscillator (QO) is presented. The proposed structure forms a closed loop using a high pass filter and differentiator. All the resistors employed in the circuit can be implemented using matched transistors operating in linear region thereby making the proposed structure fully integrated and electronically tunable. The effect of non-idealities of OTRA has been analyzed which suggests that for high frequency applications self-compensation can be used. Workability of the proposed QO is verified through

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Nguyen, Manh Hung, Hoang Vu Dao, and Kyoung Kwan Ahn. "Active Disturbance Rejection Control for Position Tracking of Electro-Hydraulic Servo Systems under Modeling Uncertainty and External Load." Actuators 10, no. 2 (2021): 20. http://dx.doi.org/10.3390/act10020020.

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In this paper, an active disturbance rejection control is designed to improve the position tracking performance of an electro-hydraulic actuation system in the presence of parametric uncertainties, non-parametric uncertainties, and external disturbances as well. The disturbance observers (Dos) are proposed to estimate not only the matched lumped uncertainties but also mismatched disturbance. Without the velocity measurement, the unmeasurable angular velocity is robustly calculated based on the high-order Levant’s exact differentiator. These disturbances and angular velocity are integrated into

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Wang, Peiyu, Chunrui Zhang, Liangkuan Zhu, and Chengcheng Wang. "The Research of Improved Active Disturbance Rejection Control Algorithm for Particleboard Glue System Based on Neural Network State Observer." Algorithms 12, no. 12 (2019): 259. http://dx.doi.org/10.3390/a12120259.

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For achieving high-performance control for a particleboard glue mixing and dosing control system, which is a time-delay system in low frequency working conditions, an improved active disturbance rejection controller is proposed. In order to reduce overshoot caused by a given large change between the actual output and expected value of the control object, a tracking differentiator (TD) is used to arrange the appropriate excesses. Through the first-order approximation of the time-delay link, the time-delay system is transformed into an output feedback problem with unknown function. Using the neu

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Vroegindeweij, Erik, Wilhelmus J. Rombouts, Joanna A. Ropela, Shin-Ichi Nishikawa, Tom Cupedo, and Jan J. Cornelissen. "Towards Regenerative Therapy for Thymic Insufficiency after Hematopoietic Stem Cell Transplantation: Generation of MTS24 Positive Definitive Endoderm from Murine Embryonic Stem Cells." Blood 110, no. 11 (2007): 2241. http://dx.doi.org/10.1182/blood.v110.11.2241.2241.

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Abstract Following hematopoietic stem cell transplantation (HSCT), longterm T-cell reconstitution should be established by thymus-dependent de-novo generation of naïve T-cells (thymopoiesis), which is especially important for generating a naïve T-cell pool with a broad T-cell receptor (TCR) repertoire. However, while erythroid and myeloid hematopoietic cell lineages recover rapidly following HSCT, T-cell development may severely lag behind due to thymic insufficiency. Recent studies in fetal mice have identified common thymic epithelial progenitor cells (TEPC) that were capable to re-establi

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He, Zhenxin, Chuntong Liu, Ying Zhan, Hongcai Li, Xianxiang Huang, and Zhili Zhang. "Nonsingular Fast Terminal Sliding Mode Control with Extended State Observer and Tracking Differentiator for Uncertain Nonlinear Systems." Mathematical Problems in Engineering 2014 (2014): 1–16. http://dx.doi.org/10.1155/2014/639707.

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A continuous nonsingular fast terminal sliding mode (NFTSM) control scheme with the extended state observer (ESO) and the tracking differentiator (TD) is proposed for second-order uncertain SISO nonlinear systems. The system’s disturbances and states can be estimated by introducing the ESO, then the disturbances are compensated effectively, and the ideal transient process of the system can be arranged based on TD to provide the target tracking signal and its high-order derivatives. The proposed controller obtains finite-time convergence property and keeps good robustness of sliding mode contro

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Shi, Di-fen, Yuan-long Hou, Xiao-hui Gu, and Run-min Hou. "Improved Finite Control Set Optimal Control for PMSM in Rocket Launcher Servo System." Shock and Vibration 2020 (August 7, 2020): 1–11. http://dx.doi.org/10.1155/2020/3651298.

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Permanent magnet synchronous motors (PMSMs) have been widely applied in the shipborne rocket launcher systems due to their high torque density and high efficiency. However, since there are many external disturbances from the shipborne rocket launcher, the tracking performance under random noises needs to be improved. In this paper, an improved finite control set optimal control (IFCSOC) based on a super-twisting extended state observer (SESO) is investigated for position tracking control of PMSMs. The SESO can improve the anti-interference ability of the proposed controller. Moreover, in order

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Oviedo-Barriga, J., L. González-Jiménez, B. Castillo-Toledo, and E. Bayro-Corrochano. "Robust tracking of bio-inspired references for a biped robot using geometric algebra and sliding mode control." Robotica 33, no. 1 (2014): 209–24. http://dx.doi.org/10.1017/s0263574714000216.

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SUMMARYControlling a walking biped robot is a challenging problem due to the robot's complex and uncertain dynamics. In order to tackle this problem, we propose a sliding mode controller based on a dynamic model that we obtained using the conformal geometric algebra (CGA) approach. An important contribution of this paper is the development of algorithms using the CGA framework. The CGA framework permits us to use lines, points, and other geometric entities to obtain the Lagrange equations of the system. The references for the joints of the robot were obtained in a bio-inspired way following th

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Kneib, Guido, and Claudia Kerner. "Accurate and efficient seismic modeling in random media." GEOPHYSICS 58, no. 4 (1993): 576–88. http://dx.doi.org/10.1190/1.1443440.

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The optimum method for seismic modeling in random media must (1) be highly accurate to be sensitive to subtle effects of wave propagation, (2) allow coarse sampling to model media that are large compared to the scale lengths and wave propagation distances which are long compared to the wavelengths. This is necessary to obtain statistically meaningful overall attributes of wavefields. High order staggered grid finite‐difference algorithms and the pseudospectral method combine high accuracy in time and space with coarse sampling. Investigations for random media reveal that both methods lead to n

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McMurtrey, Josie, Paul Driver, Pam Reed, Thomas Thrower, and Binay Kumar Shah. "Selection of medical oncology electronic medical record (EMR): A case study." Journal of Clinical Oncology 30, no. 34_suppl (2012): 327. http://dx.doi.org/10.1200/jco.2012.30.34_suppl.327.

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327 Background: Selection of an ideal EMR is an important but a complicated process, especially because there are few established guidelines available. We describe a case study on the process of selection of medical oncology EMR from our experience at St. Joseph Regional Cancer Center, Lewiston ID. Methods: A multidisciplinary team was developed, including a medical oncologist to develop workflow diagrams capturing tasks completed for patient care. This allowed the team to identify requirements and functionality important to have within an EMR. Requirements rating as high, medium or low. The s

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Shi, Xiling, Yunqiang Sun, and Xingling Shao. "Robust output feedback trajectory tracking for quadrotors." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 5 (2018): 1596–610. http://dx.doi.org/10.1177/0954410018756671.

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This paper focuses on robust output tracking control for quadrotors exposed to parametric uncertainties and external disturbances. Based on the back-stepping control principle, the quadrotor dynamics is decomposed into translational and rotational subsystems. To handle the limitation of traditional extended state observer that can only be effective for integral-chain systems, a high-order extended state observer with special structure is developed to estimate the unmeasurable states and the lumped disturbances in rotational subsystem simultaneously. To avoid the tedious analysis and repeated d

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Mayorga-Macías, Walter Alejandro, Luis Enrique González-Jiménez, Marco Antonio Meza-Aguilar, and Luis Fernando Luque-Vega. "Velocity Sensor for Real-Time Backstepping Control of a Multirotor Considering Actuator Dynamics." Sensors 20, no. 15 (2020): 4229. http://dx.doi.org/10.3390/s20154229.

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A real-time implementation of a control scheme for a multirotor, based on angular velocity sensors for the actuators, is presented. The control scheme is composed of two loops: an inner loop for the actuators and an outer loop for the unmanned aerial vehicle (UAV). The UAV control algorithm is designed by means of the backstepping technique and a robust sliding mode differentiator, and the actuator control strategy is based on a standard proportional-integral-derivative (PID) controller. A robust exact differentiator, based on high order sliding modes, is used to estimate the complex derivativ

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Kim, D., A. J. Maki, H. J. Kong, et al. "280 MULTILINEAGE POTENTIAL OF PORCINE BONE MARROW AND ADIPOSE-DERIVED MESENCHYMAL STEM CELLS IN 3-D ALGINATE HYDROGELS." Reproduction, Fertility and Development 21, no. 1 (2009): 237. http://dx.doi.org/10.1071/rdv21n1ab280.

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Adipose tissue presents an appealing alternative to bone marrow as a source of mesenchymal stem cells (MSC). However, in order to enhance cell proliferation and differentiation, 3-dimensional (3-D) culture may be required. A 3-D culture has benefits due to its more in vivo-like environment. Further, to form a functional tissue, a scaffold material is required to ensure proper shape and allow for efficient delivery of nutrients and growth factors. Alginate, a resorbable hydrogel, is a potential injectable scaffold for fat and bone tissue engineering due to its high biocompatibility, gelation wi

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Wei, Jianli, and Huan Chen. "Designing Backstepping Control System for Hypersonic Vehicle Based on Feedback Linearization." International Journal of Aerospace Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/916328.

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A hypersonic vehicle uses the airbreathing scramjet engine and the airframe and engine integrated design. Therefore, there is a strong cross-coupling effect among its aerodynamic force, thrust, structure, and control. The nonlinearity and uncertainty of the model cause difficulties in control system design. Considering the nonlinearity, coupling characteristics, and aerodynamic parametric uncertainty of its longitudinal dynamic model, we design the control law for its altitude system and velocity system based on the adaptive backstepping control method. Because of the feedback linearization me

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Chen, Hui, Xing Peng Zhou, Yong Hong Tan, Ru Qiong Li, Ya Hong Zhang, and Rui Li Dong. "Identification of Dynamic Model for Ultra-Precision Positioning System." Applied Mechanics and Materials 190-191 (July 2012): 97–100. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.97.

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Abstract: In order to improve the control precision of the piezoceramic actuator in precision position system, a dynamic modeling of Ultra-precision Positioning System is proposed. A two-step identification strategy is adopted in this paper. Step 1: The linear model was identified based on step input response by least square method. Step 2: According to the step.1 result, the designed nonlinear observer was applied to estimate the output of hysteresis by Fast Tracking Differentiator. The polynomials are used consistently approximate continuous functions of f(.) and g(.) in the Duhem modeling b

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Skrzypek, Ewa, and Robert Krzysztof Mlosek. "High frequency ultrasound assessment of labial glands simulating small nodules or granulomas after lip augmentation." Journal of Ultrasonography 20, no. 83 (2020): 261–67. http://dx.doi.org/10.15557/jou.2020.0046.

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Aim of the study: The aim of this study is to evaluate the utility of high-frequency ultrasound in the assessment of the nature and differentiation of lumps occurring in the labial mucosa after lip filling procedures. Material and methods: The study sample included 5 women aged from 28 to 43 years (mean age: 37.4 years) who previously underwent a lip augmentation or rejuvenation procedure. Photographic documentation was taken and high-frequency ultrasound assessment was performed in all the patients. The presence of deposits, foreign body granulomas, fibrosis and labial glands was mainly inves

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