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检索条件"机构=Mechatronics Engineering Program"

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Automatic acquisition and processing of large sets of holographic measurements in medical research

引用

2011 SEM Annual Conference on Experimental and Applied Mechanics

作者： Harrington, Ellery Furlong, Cosme Rosowski, John J. Cheng, Jeffrey T. Center for Holographic Studies and Laser Micro-mechaTronics Department of Mechanical Engineering Worcester Polytechnic Institute 100 Institute Rd Worcester MA 01609 United States Eaton-Peabody Laboratory Massachusetts Eye and Ear Infirmary Boston MA 02114 United States Department of Otology and Laryngology Harvard Medical School Boston MA 02114 United States Speech and Hearing Bioscience and Technology Program MIT-Harvard Division of Health Sciences and Technology Cambridge MA 02139 United States

ISBN: (纸本)9781461402275

We are developing an advanced computer-controlled digital opto-electronic holographic system (DOEHS) with the ability to operate in several modalities, including optoelectronic holographic microscopy, lensless digital holography, speckle pattern interferometry, and fringe projection. The DOEHS is being designed for medical applications requiring full-field-of-view information of shape and deformations to aid in the diagnosis and investigation of specific disorders. Particular features of the DOEHS include the capabilities to rapidly acquire and quantitatively process a relatively large amount of interferometric data. Therefore, automatic procedures for acquisition of images or video, computation and application of quality metrics, and phase unwrapping are applied with minimal user interaction. The results are catalogued with relevant metadata in a database allowing for massive analysis and comparison between subjects or patients. Currently, the DOEHS is being developed to measure acoustically induced deformations of the eardrum of several species, including humans. Measurements are used in diagnosing middle-ear conductive disorders and investigating the causes of failure of middle-ear surgical procedures. We present representative measurement procedures and results.

关键词： Deformation

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Synchronization of two uncoupled FitzHugh-Nagumo neurons via nonlinear control

Synchronization of two uncoupled FitzHugh-Nagumo neurons via...

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作者： Nguyen, Le Hoa Hong, Keum-Shik School of Mechanical Engineering Pusan National University Busan Korea Republic of Department of Cogno-Mechatronics Engineering W.C.U. Program Pusan National University Busan Korea Republic of

ISBN: (纸本)9781424474530

Individual neurons can exhibit irregular behavior, whereas ensembles of different neurons might synchronize in order to process biological information or to produce regular, rhythmical activity. Therefore, the study of synchronization processes for populations of interacting neurons is basic to the understanding of some key issues in neuroscience. In the present study, we first investigated dynamic behaviors of FitzHugh-Nagumo (FHN) neurons stimulated by external electrical signal. Second, we formulated a new method for synchronization of two uncoupled FHN neurons. By using a Lyapunov function, a nonlinear control law is designed that guarantees that two neurons are synchronized even when the external electrical stimulations applied to each neuron are different. Finally, in order to verify the effectiveness of the proposed method, numerical simulations were performed, the results of which are provided herein. ©ICROS.

关键词： Lyapunov functions

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Transverse vibration control of axially moving web systems by regulation of axial tension

Transverse vibration control of axially moving web systems b...

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作者： Nguyen, Quoc Chi Ngo, Quang Hieu Hong, Keum-Shik School of Mechanical Engineering Pusan National University Busan Korea Republic of Department of Cogno-Mechatronics Engineering W.C.U. Program Pusan National University Busan Korea Republic of

ISBN: (纸本)9781424474530

In this paper, an active control scheme that suppresses transverse vibrations and regulates axial speed so as to track a desired profile for an axially moving web system is investigated. The spatially varying tension and the time-varying axial speed of the axially moving web are considered. The system dynamics includes the equations of motion of the moving web and the velocity dynamics of the drive rollers at boundaries of the web span. The two roller motors provide control torque inputs for the control system. The principle of the vibration control strategy is the regulation of the axial tension by a designed profile according to which the vibration energy of the moving web decays. The designed profile for the axial tension is generated by using vibration analysis based on the total mechanical energy of the axially moving web system. Lyapunov method is employed to derive the model-based torque control laws ensuring that the transverse vibration and the speed tracking error converge to zero exponentially. The effectiveness of the proposed control scheme is demonstrated via numerical simulations. ©ICROS.

关键词： Lyapunov methods

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A compact nanostructure integrated pool boiler for microscale cooling applications

引用

ASME 2009 International Mechanical engineering Congress and Exposition, IMECE2009

作者： Şeşen, Muhsincan Akkartal, Cem Baha Khudhayer, Wisam Karabacak, Tansel Koşar, Ali Mechatronics Engineering Program Sabanci University Orhanli Tuzla Istanbul 34956 Turkey Department of Applied Science University of Arkansas Little Rock AR 72204 United States

ISBN: (纸本)9780791843857

An efficient cooling system consisting of a plate, on which copper nanorods (nanorods of size -100nm) are integrated to copper thin film (which is deposited on Silicon substrate), a heater, an Aluminum base, and a pool was developed. Heat is transferred with high efficiency to the liquid within the pool above the base through the plate by boiling heat transfer. Near the boiling temperature of the fluid, vapor bubbles started to form with the existence of wall superheat. Phase change took place near the nanostructured plate, where the bubbles emerged from. Bubble formation and bubble motion inside the pool created an effective heat transfer from the plate surface to the pool. Nucleate boiling took place on the surface of the nanostructured plate helping the heat removal from the system to the liquid above. The heat transfer from nanostructured plate was studied using the experimental setup. The temperatures were recorded from the readings of thermocouples, which were successfully integrated to the system. The surface temperature at boiling inception was 102.1°C without the nanostructured plate while the surface temperature was successfully decreased to near 100°C with the existence of the nanostructured plate. In this study, it was proved that this device could have the potential to be an extremely useful device for small and excessive heat generating devices such as MEMS or Micro-processors. This device does not require any external energy to assist heat removal which is a great advantage compared to its counterparts. Copyright © 2010 by ASME.

关键词： Surface temperature

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Silica nanochannel device for pH sensing based on surface charge density changes

Silica nanochannel device for pH sensing based on surface ch...

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2010 10th IEEE Conference on Nanotechnology, NANO 2010

作者： Lee, Sang Young Yoon, Sang Youl Lee, Kyeong-Hwan Yang, Sung Department of Nanobio Material and Electronics School of Information and Mechatronics GIST Korea Republic of Graduate- Program of Medical System Engineering Biomedical Micro/Nano Device Laboratory GIST Korea Republic of

ISBN: (纸本)9781424470334

This paper demonstrates a novel micro/nano fluidic device for continuous pH sensing of small fluid volumes. The working principle of the device is based on the change of the surface charge density within the silica nano channels with respect to the pH levels of the electrolyte. In order to measure pH levels of various solutions, AC potential is applied along the silica nanochannels which have 50 nm depth, 2 μm width, and 30 μm length. The running current along the nanofluidic channels is directly measured with respect to pH levels. It was found that the running current is inversely proportional to pH levels regardless of ion concentrations. ©2010 IEEE.

关键词： Electrolytes

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A novel peristaltic micropump using three wings with different widths for fluid circulation

A novel peristaltic micropump using three wings with differe...

引用

14th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2010, MicroTAS 2010

作者： Mun, Byung Phil Park, Chang Ju Yoo, Sung Keun Lee, Jong Hyun School of Information and Mechatronics GIST Gwangju Korea Republic of Graduate Program of Medical System Engineering GIST Gwangju Korea Republic of Dept. of Nanobio Materials and Electronics GIST Gwangju Korea Republic of

ISBN: (纸本)9781618390622

This paper reports a novel micropump to effectively rotate fluid in a circular channel. The proposed micropump having different wing widths, which squeezes the flexible part of the fluidic channel at a different time interval, provides a peristaltic effect with a single pneumatic pressure source. This allows simple operation and easy integration with a micro total analysis system (μ-TAS).

关键词： Flexible structures

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Exact linearization and fuzzy logic applied to the control of a Magnetic Levitation System

Exact linearization and fuzzy logic applied to the control o...

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2010 6th IEEE World Congress on Computational Intelligence, WCCI 2010

作者： Torres, Luiz H. S. Vasconcelos Jr., Carlos A.V. Schnitman, Leizer De Souza, J. A. M Felippe Control Lab Post-graduate Program in Mechatronics Federal University of Bahia Rua Aristides Novis 40.210-630 Salvador Bahia Brazil Electromechanical Engineering Department University of Beira Interior Covilhã Portugal

ISBN: (纸本)9781424469208

In recent years the area of nonlinear control systems has been the subject of many studies. Computational developments have enabled more complex applications to provide solutions to nonlinear problems. The purpose of this paper is to use a combination of two techniques to control a nonlinear system: the Magnetic Levitation System. First, the exact linearization technique with state feedback is applied to obtain a linear system. Second, the linearization is made via direct cancellation of nonlinear functions, which represent the phenomenological model of the system. Finally, to deal with the presence of uncertainty in the system model, an adaptive controller is used. The controller is based on fuzzy logic to estimate the functions that contain the nonlinearities of the system. The fuzzy system is a zero-order Takagi-Sugeno-Kang structure and the adaptive controller is implemented in a simulated environment (Matlab Simulink ©). The methodology guarantees the convergence of the estimates to their optimal values, and in turn the overall stability of the system. The results show the controller output signal tracks a reference input signal. For future work this adaptive controller should be implemented in a real physical system. © 2010 IEEE.

关键词： Adaptive control systems

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NIRS based brain activation mapping: A real-time application

NIRS based brain activation mapping: A real-time application

引用

作者： Hu, Xiao-Su Hong, Keum-Shik Ge, Shuzhi Sam Departement of Cogno-Mechatronics Engineering W.C.U. Program Pusan National University 30 Jangjeon-dong Gumjeong-gu Busan 609-735 Korea Republic of Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore

ISBN: (纸本)9781424474530

Near-infrared spectroscopy (NIRS) is a non-invasive neuroimaging technique that recently has been used to measure changes in cerebral blood oxygenation associated with brain activity. To date, there is no standard method for analyzing NIRS data, especially for real-time brain imaging applications. In this work, a novel real-time NIRS signal analysis framework based on the general linear model (GLM) and the Kalman estimator was devised. A set of simulated data was processed using the proposed framework. The results so obtained suggested that the method can effectively locate brain activation areas in real-time, thereby demonstrating its potential for real-time NIRS-based brain imaging applications. ©ICROS.

关键词： Near infrared spectroscopy

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On evaluation of robust autonomy for uninhabited vehicles and systems

On evaluation of robust autonomy for uninhabited vehicles an...

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作者： Perez, Tristan Donaire, Alejandro Willams, Brendan P. School of Engineering Discipline of Mechanics and Mechatronics University of Newcastle Callaghan NSW 2308 Australia University of Newcastle Callaghan NSW 2308 Australia Advanced UAS Applications Program Boeing Research and Technology Australia GPO Box 767 Brisbane QLD 4001 Australia

ISBN: (纸本)9783902661876

This paper discusses a method to quantify robust autonomy of Uninhabited Vehicles and Systems (UVS) in aerospace, marine, or land applications. Based on mission-vehicle specific performance criteria, we define an system utility function that can be evaluated using simulation scenarios for an envelope of environmental conditions. The results of these evaluations are used to compute a figure of merit or measure for operational effectiveness (MOE). The procedure is then augmented to consider faults and the performance of mechanisms to handle these faulty operational modes. This leads to a measure of robust autonomy (MRA). The objective of the proposed figures of merit is to assist in decision making about vehicle performance and reliability at both vehicle development stage (using simulation models) and at certification stage (using hardware-in-the-loop testing). Performance indices based on dynamic and geometric tasks associated with vehicle manoeuvring problems are proposed, and an example of a two- dimensional y scenario is provided to illustrate the use of the proposed figures of merit.

关键词： Vehicle performance

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Adaptive control for a multi-condenser inverter heat pump system

Adaptive control for a multi-condenser inverter heat pump sy...

引用

International Conference on Control, Automation and Systems ( ICCAS)

作者： Qilun Song Gi-Yong Hong Keum-Shik Hong School of Mechanical Engineering Pusan National University Busan South Korea Department of Cogno-Mechatronics Engineering (WCU program) Pusan National University Busan South Korea

A constant-speed heat pump is unsuitable for a multi-condenser system, owing to the impossibility of using the same compressor frequency to control individual subsystems. In the present study therefore, an inverter heat pump actuated by a variable-speed compressor was adapted for a multi-condenser system. To control the temperature of two air-conditioned rooms individually, two step-motor-driven electronic expansion valves (EEVs) were used to control the refrigerant mass flow rate. To satisfy the different conditioning requirements of the two rooms, the EEVs themselves were governed by a model reference adaptive control (MRAC) law. A test was conducted to obtain the fit function for the compressor frequency and the EEVs' opening area, so that the compressor could be effectively controlled. A cooling cycle model, including a rotary compressor, two condensers, an EEV and an evaporator, was derived, and a simplified first-order model was used for the two air-conditioned rooms. Simulation results proved that the heat pump with the developed control strategy and algorithm is a very efficient means of achieving desirable temperature control results.

关键词： Heat pumps Refrigerants Heating Valves Frequency control Heat transfer

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