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American control Conference (ACC)

作者： M. Haeri A.H.M. Rad Electrical Engineering Department Advanced Control System Laboratory Sharif University of Technology Tehran Iran Electrical Engineering Advanced Control Systems Laboratory Sharif University of Technology Iran

In this paper, the TCP retransmission timer adjustment mechanism is approached from the system's theoretic point of view. TCP uses a simple recursive system identification algorithm to capture both time variant and time invariant Internet behavior and provides a dynamic round-trip time (RTT) predictor. Based on real Internet data collection, it is observed that when the retransmission timer is adjusted by using the proposed predictor instead of the traditional RTT estimator, its performance increases significantly.

关键词： system identification Internet TCPIP Throughput Laboratories control systems Electronic mail Jacobian matrices Low pass filters Testing

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Model-Based Adaptive Frequency Estimator for Gear Crack Fault Detection

Model-Based Adaptive Frequency Estimator for Gear Crack Faul...

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American control Conference

作者： Geoff McDonald Qing Zhao Advanced Control System Laboratory Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

ISBN: (纸本)9781457700811;9781457700804

Detection of gear cracks from vibration data is a difficult task. This paper investigates an alternative to the linear predictor residual fault detection based on the nonlinear adaptive control system concept of frequency estimators. The frequency estimator model takes advantage of the sinusoidal nature of vibration and adapts the system model during operation. The low-computational requirements, no-priori knowledge, sinusoidal-based prediction, and on-line model adaption makes this model ideal for on-line gear crack fault detection. Performance is evaluated through both synthetic and experimental data while comparing to the autoregressive linear predictor model.

关键词： Defect detection Gears systems modelling linear predictor SYNTHETICS control systems on-line model Experimental data Nonlinear adaptive control

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Flow and thermal modeling of liquid metal in expanded microchannel heat sink

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Frontiers in Energy 2023年第6期17卷 796-810页

作者： Mingkuan ZHANG Xudong ZHANG Luna GUO Xuan LI Wei RAO Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin 300384China Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing 100084China School of Mechanical Engineering Tianjin University of CommerceTianjin 300134China Institute of Refrigeration and Cryogenics Shanghai Jiao Tong UniversityShanghai 200240China Beijing Key Laboratory of CryoBiomedical Engineering and Key Laboratory of Cryogenics Beijing 100190China

Liquid metal-based microchannel heat sinks (MCHSs) suffer from the low heat capacity of coolant, resulting in an excessive temperature rise of coolant and heat sink when dealing with high-power heat dissipation. In this paper, it was found that expanded space at the top of fins could distribute the heat inside microchannels, reducing the temperature rise of coolant and heat sink. The orthogonal experiments revealed that expanding the top space of channels yielded similar temperature reductions to changing the channel width. The flow and thermal modeling of expanded microchannel heat sink (E-MCHS) were analyzed by both using the 3-dimensional (3D) numerical simulation and the 1-dimensional (1D) thermal resistance model. The fin efficiency of E-MCHS was derived to improve the accuracy of the 1D thermal resistance model. The heat conduction of liquid metal in Z direction and the heat convection between the top surface of fins and the liquid metal could reduce the total thermal resistance (Rt). The above process was effective for microchannels with low channel aspect ratio, low mean velocity (Um) or long heat sink length. The maximum thermal resistance reduction in the example of this paper reached 36.0%. The expanded space endowed the heat sink with lower pressure, which might further reduce the pumping power (P). This rule was feasible both when fins were truncated (h_(2) < 0, h_(2) is the height of expanded channel for E-MCHS) and when over plate was raised (h_(2) > 0).

关键词： liquid metal cooling heat sink expanded microchannel flow and thermal modeling

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Feature extraction of electroencephalogram of photic evoked spikes with slow burst and its automatic detection

Feature extraction of electroencephalogram of photic evoked ...

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ICROS-SICE International Joint Conference 2009, ICCAS-SICE 2009

作者： Nishida, Shigeto Sugi, Takenao Ikeda, Akio Nagamine, Takashi Shibasaki, Hiroshi Nakamura, Masatoshi Department of Computer and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Electrical and Electronic Engineering Saga University Saga Japan Department of Neurology Kyoto University School of Medicine Kyoto Japan Department of System Neuroscience Sapporo Medical University Sapporo Japan Takeda General Hospital Kyoto Japan Department of Advanced Systems Control Engineering Saga University Saga Japan

ISBN: (纸本)9784907764333

A method for detecting spikes and slow burst in photic evoked electroencephalogram (EEG) was proposed. The spikes were detected by combining methods of the morphological filter and the similarity coefficient in the time domain. The slow burst was detected by using pole of AR model in the frequency domain. The proposed method was applied for the photic evoked EEG data containing spikes and slow burst, and brought satisfactory coincidence with the results interpreted by a qualified electroencephalographer. © 2009 SICE.

关键词： Electroencephalography

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Forearm motion assist with an exoskeleton: adaptation to muscle activation patterns

Forearm motion assist with an exoskeleton: adaptation to mus...

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IEEE International Workshop on Intelligent Robots and systems (IROS)

作者： K. Kiguchi R. Esaki T. Fukuda Department of Advanced Systems Control Engineering Saga University Saga Japan Department of Micro System Engineering University of Nagoya Nagoya Japan

This paper presents an exoskeleton for the assist of forearm motion (elbow flexion-extension and forearm pronationsupination motion) in daily activity and rehabilitation. The exoskeleton is controlled based on the activation patterns of the electromyogram (EMG) signals of the patient's muscles, which directly reflects the motion intention of the patient, in order to realize natural motion assist The sophisticated real-time neurofuzzy control method, in which the effect of a muscle common to both motions is taken into account, is proposed. The proposed control method enables the cooperative motion of elbow and forearm of the patient by learning the muscle activation patterns of each patient. The effectiveness of the proposed method was evaluated by experiment.

关键词： Exoskeletons Muscles Electromyography Motion control Elbow Wrist Medical control systems Shoulder control systems Robots

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Design of nonlinear separation controller based on heat relation for evaporator in STEC plant

Design of nonlinear separation controller based on heat rela...

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IEEE Winter Meeting Power engineering Society

作者： S. Goto M. Nakamura M. Kaijwara Y. Ikegami H. Uehara Department of Advanced Systems Control Engineering Saga University Saga Japan Department of Mechanical System Engineering Saga University Saga Japan

ISBN: (纸本)0780373227

Nonlinear separation control method was constructed for a STEC (spring thermal energy conversion) pilot plant. The nonlinear separation control consists of nonlinear statics compensation and linear dynamics compensation. In this paper, evaporator outlet heat quantity of working fluid was controlled by use of the nonlinear separation method.

关键词： Temperature control Springs Turbines Power generation Pumps Rivers Water heating Pressure control Boilers Refrigeration

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3D bioprinting of in vitro porous hepatoma models:establishment,evaluation,and anticancer drug testing

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Bio-Design and Manufacturing 2024年第2期7卷 137-152页

作者： Xiaoyuan Wang Zixian Liu Qianqian Duan Boye Zhang Yanyan Cao Zhizhong Shen Meng Li Yanfeng Xi Jianming Wang Shengbo Sang Shanxi Key Laboratory of Micro Nano Sensors and Artificial Intelligence Perception College of Electronic Information and Optical EngineeringTaiyuan University of TechnologyTaiyuan 030024China Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China Shanxi Institute of 6D Artificial Intelligence Biomedical Science Taiyuan 030031China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024China Department of Pathology Shanxi Provincial Cancer HospitalTaiyuan 030024China General Hospital of Taiyuan Iron and Steel Company Taiyuan 030809China

Traditional tumor models do not tend to accurately simulate tumor growth in vitro or enable personalized treatment and are particularly unable to discover more beneficial targeted *** address this,this study describes the use of threedimensional(3D)bioprinting technology to construct a 3D model with human hepatocarcinoma SMMC-7721 cells(3DP-7721)by combining gelatin methacrylate(GelMA)and poly(ethylene oxide)(PEO)as two immiscible aqueous phases to form a bioink and innovatively applying fluorescent carbon quantum dots for long-term tracking of *** GelMA(10%,mass fraction)and PEO(1.6%,mass fraction)hydrogel with 3:1 volume ratio offered distinct pore-forming characteristics,satisfactorymechanical properties,and biocompatibility for the creation of the 3DP-7721 *** analysis and quantitative real-time fluorescence polymerase chain reaction(PCR)were used to evaluate the biological properties of the *** with the two-dimensional culture cell model(2D-7721)and the 3D mixed culture cell model(3DM-7721),3DP-7721 significantly improved the proliferation of cells and expression of tumor-related proteins and ***,we evaluated the differences between the three culture models and the effectiveness of antitumor drugs in the three models and discovered that the efficacy of antitumor drugs varied because of significant differences in resistance proteins and genes between the three *** addition,the comparison of tumor formation in the three models found that the cells cultured by the 3DP-7721 model had strong tumorigenicity in nude *** evaluation of the levels of biochemical indicators related to the formation of solid tumors showed that the 3DP-7721 model group exhibited pathological characteristics of malignant tumors,the generated solid tumors were similar to actual tumors,and the deterioration was *** research therefore acts as a foundation for the application of 3DP-7721 models in drug devel

关键词： 3D bioprinting Hepatoma tumor models Drug screening Antitumor drug development

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Characteristics of low-speed streaks and vortex structures in drag-reduced turbulent channel flow investigated by stereoscopic PIV

Characteristics of low-speed streaks and vortex structures i...

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2004 ASME International Mechanical engineering Congress and Exposition, IMECE 2004

作者： Li, Feng-Chen Segawa, Takehiko Kawaguchi, Yasuo Hishida, Koichi Turbomachinery Research Group Institute for Energy Utilization National Institute of Advanced Industrial Science and Technology Tsukuba 305-8564 Japan Center for Smart Control of Turbulence Department of System Design Engineering Keio University Yokohama 223-8522 Japan

In the present study, we employed stereoscopic particle image velocimetry (SPIV) to investigate the characteristics of turbulence structures in a drag-reduced turbulent channel flow with addition of surfactant. The tested drag-reducing fluid was a CTAC (cetyltrimethyl ammonium chloride)/NaSal/Water system maintained at 25°C, having a 30-ppm concentration of CTAC. SPIV measurement was performed for a water flow (Re = 1.1×105) and a CTAC solution flow (Re = 1.5×105 with 54% drag reduction) in both the streamwise-spanwise and wall-normal-spanwise planes, respectively. A series of wall-normal vortex cores were found to align with the low-speed streaks with opposite vorticity signals at both sides of the streaks and with the vorticity decreased averagely by about one order in CTAC solution flow compared with water flow;the spanwise spacing between the low-speed streaks in the solution flow is increased by about 42%. The streamwise vorticity of the vortex cores appearing in the wall-normal-spanwise plane was also decreased by the use of additives. Copyright © 2004 by ASME.

关键词： Channel flow

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Electro-pneumatic time-delay control of high amplitude vibrations at asymptotic stability of pneumatic table due to mechanical valve operations

Electro-pneumatic time-delay control of high amplitude vibra...

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40th International Congress and Exposition on Noise control engineering 2011, INTER-NOISE 2011

作者： Sun, Jong-Oh Oh, Tae-Seok Kim, Kwang-Joon Gil, Hyeong Gyeun Department of Mechanical Engineering Center for Noise and Vibration Control Korea Advanced Institute of Science and Technology Science Town Daejeon 305-701 Korea Republic of Daeil System 475-3 Maengri Wonsam-myun Yongin Gyunggido Korea Republic of

ISBN: (纸本)9781618392800

A typical pneumatic table for vibration isolation is equipped with mechanical valves to level the table as well as to compensate large pressure change in the chamber. Once the mechanical valves are adjusted at the initial stage of installations of the table with equipments on it, it is expected that the table be stable. Sometimes, however, there may occur high amplitude vibrations at the asymptotic stability of the pneumatic system due to unexpected large disturbances in the equipments or other external excitations. Recently active control of pneumatic tables using electro-pneumatic valves has been realized very successfully for suppression of vibrations even in the very low frequency range due to excitations from either ground or equipments. Although the main purpose of this active technique is to control vibrations at low amplitudes smaller than tens of μm, it can also be applied to control vibrations at high amplitudes larger than a few mm because the electro-pneumatic valves can easily provide large dynamic pressure into the air chamber. In this paper, high amplitude vibrations at the asymptotic stability of a pneumatic table with mechanical valves will be illustrated. Then, suppressions of those by 3 degree of freedom active time delay control using the electro-pneumatic valves will be presented. Successful results of the method will be discussed together with feasible applications in practice.

关键词： Time delay

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Harmonic control of Triple-band Microstrip Antenna Using Photonic Band Gap Approach

Harmonic Control of Triple-band Microstrip Antenna Using Pho...

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International Conference on Intelligent and advanced systems

作者： Tale Saeidi Idris bin Ismail M. A. Zakariya Adam R. H. Alhawari Instrument Smart System and Advanced Control Centre (ISAAC) Department of Electrical & Electronic Engineering Universiti Teknologi PETRONAS

ISBN: (纸本)9781509008469

In this paper, four elements fractal shape antenna with non-uniform annular ring Photonic Band Gap (PBG) etched in the ground is presented. The impact of the PBG structure in removing the undesired harmonic frequencies of the proposed antenna is demonstrated. The proposed antenna is designed, fabricated and tested. The results show that the designed antenna is capable of resonating at three different frequencies of 915 MHz, 1.8 GHz and 2.45 GHz with high-efficiency performance in terms of return loss, gain and radiation pattern characteristics with compact size. Good agreement between the measured and the simulated results is observed.

关键词： PBG Triple band Performance Harmonic Surface current

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