Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Genetic algorithms (5)
- Diabetes (4)
- Optimization (4)
- TEST STANDS (4)
- Measurement (3)
-
- Navigation (3)
- PROTOCOL (COMPUTERS) (3)
- Sensors (3)
- Artificial neural networks (2)
- Automation (2)
- Automotive brakes (2)
- COMMUNICATION NETWORKS (2)
- Coal (2)
- Coal spiral (2)
- Coal washing (2)
- Composite materials (2)
- Control system (2)
- Density separation (2)
- Fracture mechanics (2)
- Fuzzy logic (2)
- INTELLIGENCE (2)
- Industrial plants (2)
- Intelligent sensors (2)
- MICROPROCESSORS (2)
- Monitoring systems (2)
- Pressure control (2)
- Rockets (2)
- SENSORS (2)
- SYSTEMS INTEGRATION (2)
- File Type
Articles 31 - 60 of 103
Full-Text Articles in Mechanical Engineering
A Novel Fiber Optics Based Method To Measure Very Low Strains In Large Scale Infrastructures, Bradley Regez, Mohammad Sayeh, Ajay Mahajan, Fernando Figueroa
A Novel Fiber Optics Based Method To Measure Very Low Strains In Large Scale Infrastructures, Bradley Regez, Mohammad Sayeh, Ajay Mahajan, Fernando Figueroa
Dr. Ajay Mahajan
An optic fiber strain measurement sensing mechanism has been developed that can measure extremely low strains, i.e. in the order of 0–25 microstrains, with a resolution close to 0.1 microstrain. It is an alternate to traditional foil gauges as well as the more recent Fabry–Perot sensors for some applications. It is particularly suited to measure very low strains in large scale infrastructures where portions of the infrastructure can be used to mount extended lengths of the fiber optic, thereby providing high resolution. Examples of such applications are the measurement of small strains or vibrations in large structures such as rocket …
Adaptive Intelligent Control Of Ionic Polymer–Metal Composites, Brijesh Lavu, Marco Schoen, Ajay Mahajan
Adaptive Intelligent Control Of Ionic Polymer–Metal Composites, Brijesh Lavu, Marco Schoen, Ajay Mahajan
Dr. Ajay Mahajan
Electroactive polymers undergo physical deformation in response to external voltage stimuli. These electrically activated polymers possess extraordinary features making them capable of use as lightweight sensors and actuators in manifold applications. The characteristics of applied voltage and environmental conditions, especially the moisture content surrounding the polymer, have a combined influence on the dynamical behavior of these polymers. In order to characterize these polymers under varying environmental conditions, this paper discusses the experimental procedure and modeling techniques used to derive a representative model. Validation of the model derived is provided by comparison tests of the simulated model results and those for …
A Robust Method To Determine The Coordinates Of A Wave Source For 3-D Position Sensing, Fernando Figueroa, Ajay Mahajan
A Robust Method To Determine The Coordinates Of A Wave Source For 3-D Position Sensing, Fernando Figueroa, Ajay Mahajan
Dr. Ajay Mahajan
This work addresses a method for location of a wave source by observing the wave as it reaches various observation points (receivers), or conversely, this is also a method for location of a receiver at an observation point, by probing with waves generated at various sources. The terms observing and probing imply measurement of time-of-flight (TOF) between a source (transmitter) and a receiver. Practical implications of this work include development and improvement of systems that triangulate the position of a point of interest based on TOF measurements to observation points. Typical applications to benefit from this work include 3-D digitization …
Intelligent System Modelling Of A Three-Dimensional Ultrasonic Positioning System Using Neural Networks And Genetic Algorithms, Nishant Unnikrishnan, Ajay Mahajan, Tsuchin Chu
Intelligent System Modelling Of A Three-Dimensional Ultrasonic Positioning System Using Neural Networks And Genetic Algorithms, Nishant Unnikrishnan, Ajay Mahajan, Tsuchin Chu
Dr. Ajay Mahajan
This paper presents a neural network model for a three-dimensional ultrasonic position estimation system that uses the difference in the time of arrivals of waves from a transmitter to various receivers. Even though a linearized analytical model for the three-dimensional system exists and is currently being used to estimate the position of the transmitter, its accuracy is highly dependent on complex and time consuming signal conditioning. A neural network approach is developed to train the system based on unconditioned training sets obtained directly from the receivers. It is proposed to use the final trained system to estimate the three-dimensional position …
Association Of Genetic Polymorphisms With Immunohistochemical Expression Of Thyroid Transcription Factor 1 (Ttf1) In Asian Nsclc Adenocarcinoma Patients, Wan-Teck Lim, Onkar Singh, Edwin Sandaranaj, Ajay Mahajan, Eng Tan
Association Of Genetic Polymorphisms With Immunohistochemical Expression Of Thyroid Transcription Factor 1 (Ttf1) In Asian Nsclc Adenocarcinoma Patients, Wan-Teck Lim, Onkar Singh, Edwin Sandaranaj, Ajay Mahajan, Eng Tan
Dr. Ajay Mahajan
No abstract provided.
A Dic Based Ga Optimization Scheme Using Six Variable Chromosomes, Dooheon Kim, Sailesh Pradhan, Tsuchin Chu, Ajay Mahajan
A Dic Based Ga Optimization Scheme Using Six Variable Chromosomes, Dooheon Kim, Sailesh Pradhan, Tsuchin Chu, Ajay Mahajan
Dr. Ajay Mahajan
A Digital Image Correlation using a Genetic Algorithm based optimization technique for measurement of whole field surface displacements and strains has been described. The GA scheme has been implemented using a six variable system which includes direct measurement of strains. Earlier problems reported during cross-over and blending of chromosomes primarily owing to differences in order of magnitude of the strains and displacements have been overcome by using pre-generated separate look-up tables of equal length for most probable values of u and v displacements as well as the gradients. The indices of these tables have then been used as the chromosomes …
General Engineering Education For Non-Engineering Students, Ajay Mahajan, David Mcdonald, Maurice Walworth
General Engineering Education For Non-Engineering Students, Ajay Mahajan, David Mcdonald, Maurice Walworth
Dr. Ajay Mahajan
This paper addresses the issue of general engineering education, specifically for non-engineering students. General engineering education involves defining technology and the role it plays in society, developing problem solving skills, and introducing students to a sequential design process that instills in the students the ability to question a process or procedure. It is intended to relieve the students' fears of using new technologies, and instill confidence in their ability to adapt in an emerging highly technological society. This paper further describes the first attempts made at LSSU with an innovative course called Exploring Technology (ET 100) that endeavours to address …
Investigation Of High-Frequency Squeal In A Disc Brake System Using A Friction Layer-Based Coupling Stiffness, Manish Paliwal, Ajay Mahajan, J. Don, Tsuchin Chu, Peter Filip
Investigation Of High-Frequency Squeal In A Disc Brake System Using A Friction Layer-Based Coupling Stiffness, Manish Paliwal, Ajay Mahajan, J. Don, Tsuchin Chu, Peter Filip
Dr. Ajay Mahajan
This paper presents a two degree of freedom model for disk brake systems that makes use of the concept of a friction layer-based coupling stiffness. This model is then used to investigate noise and vibration, especially high-frequency squeal. It is shown that for automotive brake systems, the friction layer plays a significant role in the performance characteristics. Hence, the coupling stiffness between the brake pad and the rotor is modelled as a combination of the elastic stiffness of the friction layer superimposed on the coupling modal stiffness of the brake-pad combination. The elastic properties of the friction layer are obtained …
Automated System For Coal Spiral, Manoj Mohanty, Ajay Mahajan, Haibo Wang, Baojie Zhang
Automated System For Coal Spiral, Manoj Mohanty, Ajay Mahajan, Haibo Wang, Baojie Zhang
Dr. Ajay Mahajan
An apparatus and method for sensor and control system, which automatically adjusts a product splitter position of a full-scale spiral. An electrical conductivity-based automation system is described and claimed herein and has been successfully developed and demonstrated as illustrated herein. The system includes a sensor and a microprocessor based and controlled servo or gear motor that is utilized to adjust the splitter of an operating coal/mineral spiral based on the readings of the sensor. The device as described and claimed herein converts a traditional coal spiral to an automated system for controlling the splitter thereby giving the spiral unit the …
High-Speed String Matching For Network Intrusion Detection, Benfano Soewito, Ajay Mahajan, Ning Weng, Haibo Wang
High-Speed String Matching For Network Intrusion Detection, Benfano Soewito, Ajay Mahajan, Ning Weng, Haibo Wang
Dr. Ajay Mahajan
Intrusion detection systems are promising techniques to improve internet security. A daunting challenge in the design of internet intrusion detection systems is how to perform high-speed string matching operations. This paper presents a string matching architecture, consisting of software based classifiers and hardware based verifiers. Based on incoming packet contents, the packet classifiers can dramatically reduce the number of strings to be matched and accordingly, feed the packet to a proper verifier to conduct matching. The paper presents the proposed classifier architecture and discusses the trade-offs in the classifier design. In addition, techniques, including multi-threading FSM, high-speed FSM interface circuits …
Physical Intelligent Sensors, Pavan Bandhil, Sanjeevi Chitikeshi, Ajay Mahajan, Fernando Figueroa
Physical Intelligent Sensors, Pavan Bandhil, Sanjeevi Chitikeshi, Ajay Mahajan, Fernando Figueroa
Dr. Ajay Mahajan
This paper proposes the development of intelligent sensors as part of an integrated systems approach, i.e. one treats the sensors as a complete system with its own sensing hardware (the traditional sensor), A/D converters, processing and storage capabilities, software drivers, self-assessment algorithms, communication protocols and evolutionary methodologies that allow them to get better with time. Under a project being undertaken at the NASA s Stennis Space Center, an integrated framework is being developed for the intelligent monitoring of smart elements. These smart elements can be sensors, actuators or other devices. The immediate application is the monitoring of the rocket test …
Generic Model Of An Autonomous Sensor, Fernando Figueroa, Ajay Mahajan
Generic Model Of An Autonomous Sensor, Fernando Figueroa, Ajay Mahajan
Dr. Ajay Mahajan
No abstract provided.
In-Plane Bulk Material Displacement And Deformation Measurements Using Digital Image Correlation Of Ultrasonic C-Scan Images, Bradley Regez, Ying Zhang, Tsuchin Chu, Jarlen Don, Ajay Mahajan
In-Plane Bulk Material Displacement And Deformation Measurements Using Digital Image Correlation Of Ultrasonic C-Scan Images, Bradley Regez, Ying Zhang, Tsuchin Chu, Jarlen Don, Ajay Mahajan
Dr. Ajay Mahajan
The extension of digital image correlation method to ultrasonic C-scan acoustical speckle images of the bulk is presented in this paper. The approach discussed in this paper is ideally suited to composite materials such as particulate composites, fiber-reinforced plastics, and laminated composites. It can also be effectively employed for critical surfaces that are not within view, such as interfaces and back surfaces. Images taken prior to and after deformation are analyzed to estimate a deformation profile from changes in the image. The aim of the method is to find the displacements and strains of small subsets from the second image …
A Lumped-Parameter Model To Investigate The Effect Of Plantar Pressure On Arterial Blood Flow In A Diabetic Foot, Carrie Hahn, Ajay Mahajan, Tsuchin Chu, Marco Schoen
A Lumped-Parameter Model To Investigate The Effect Of Plantar Pressure On Arterial Blood Flow In A Diabetic Foot, Carrie Hahn, Ajay Mahajan, Tsuchin Chu, Marco Schoen
Dr. Ajay Mahajan
This paper presents a lumped-parameter model for the big-toe region that investigates the effect of plantar pressure on the diameter of the blood vessels, specifically the arteries, in the presence of arterial and/or tissue changes. The model developed in this paper uses a multi-domain energy system approach to develop the lumped-parameter differential equations. Blood flow is modelled as fluidic flow through compliant pipes that have inertia, stiffness, and damping. The tissue material is treated as a soft compliant material that transmits the external force to the blood vessels. Conclusions have been drawn to show the effect of plantar pressure, tissue …
Method And System For Facilitating Surgery, Ajay Mahajan, Sumeer Lal
Method And System For Facilitating Surgery, Ajay Mahajan, Sumeer Lal
Dr. Ajay Mahajan
In a method for facilitating surgery, a signal or signals are transmitted from one or more transmitters coupled to a surgical probe, and the signal or signals are received at a plurality of receivers. An estimate of a position of a portion of the surgical probe is determined based on the signal or signals received by the plurality of receivers. An indication of the estimate of the position is displayed on a display unit, wherein the display unit displays a representation of an anatomy of a patient, and wherein the indication of the estimate of the position is integrated with …
An Iterative Kalman Filter For A 3d Ultrasonic Position Estimation System, Sanjeevi Chitikeshi, Ajay Mahajan, Jennifer Akers
An Iterative Kalman Filter For A 3d Ultrasonic Position Estimation System, Sanjeevi Chitikeshi, Ajay Mahajan, Jennifer Akers
Dr. Ajay Mahajan
This paper describes an iterative Kalman Filter to increase the accuracy of a dynamic 3D position estimation system. The novelty of the system lies in the fact that a difference in the time of arrivals is used in conjunction with an estimated speed of sound within the system formulation, and the Kalman Filter is used to further increase the accuracy and robustness of the output. The output is a 3D position of the transmitter obtained from the difference in time of arrivals of the wave burst at multiple receivers fixed within an inertial frame. Results are provided to show the …
Intelligent Image Correlation Using Genetic Algorithms For Measuring Surface Deformations In The Autonomous Inspection Of Structures, Ajay Mahajan, Alan Pilch, Tsuchin Chu
Intelligent Image Correlation Using Genetic Algorithms For Measuring Surface Deformations In The Autonomous Inspection Of Structures, Ajay Mahajan, Alan Pilch, Tsuchin Chu
Dr. Ajay Mahajan
Summary form only given. Presents an intelligent digital image correlation technique that uses genetic algorithms to estimate surface displacements and strains for autonomous inspection of structures. Speckle patterns are spray painted on the surface of interest and pictures taken before and during loading using off-the-shelf CCD quickcams. Subpixel accuracy, required for measuring displacements and strains accurately, is obtained by using interpolation methods. An innovative adaptive scheme is used to develop a cost surface which is used to match the before and after image subsets with the help of genetic algorithms to search for the optimal match. Some potential applications for …
A Novel Method To Create Intelligent Sensors With Learning Capabilities, Ajay Mahajan, Fernando Figueroa
A Novel Method To Create Intelligent Sensors With Learning Capabilities, Ajay Mahajan, Fernando Figueroa
Dr. Ajay Mahajan
A formal theory for the development of a generic model of an autonomous sensor is proposed and implemented. An autonomous sensor not only interprets the acquired data in accordance with an embedded expert system knowledge base, but is also capable of using this data to modify and enhance this knowledge base. Hence, the system is capable of learning and thereby improving its performance over time. The main objective of the model is to combine the capabilities of the physical sensor and an expert operator monitoring the sensor in real-time. The system has been successfully tested using various simulated data sets …
Effect Of Different Planting Systems On Growth, Flowering, Fruiting And Yield Of Guava, Ajay Mahajan, Sumeer Lal, J. Tiwari
Effect Of Different Planting Systems On Growth, Flowering, Fruiting And Yield Of Guava, Ajay Mahajan, Sumeer Lal, J. Tiwari
Dr. Ajay Mahajan
No abstract provided.
Influence Of Diamond-Like Carbon Coatings On The Fatigue Behavior Of Spinal Implant Rod, Yicheng Pan, Jarlen Don, Tsuchin Chu, Ajay Mahajan
Influence Of Diamond-Like Carbon Coatings On The Fatigue Behavior Of Spinal Implant Rod, Yicheng Pan, Jarlen Don, Tsuchin Chu, Ajay Mahajan
Dr. Ajay Mahajan
The purpose of this paper is to discuss the influence of Diamond–Like Carbon (DLC) coatings on the fatigue behavior of Spinal implant rod. DLC exists in seven different forms of amorphous carbon materials that display some of the unique properties of diamond. They are usually applied as coatings to other materials that could benefit from some of unique diamond properties. In this work, we compared bending fatigue behavior between Stainless Ti6Al4V and DLC Coating Spinal implant rod. The positive effect has been observed by fatigue tests carried out at ASTM Standard D790. Fatigue life and endurance limit of spinal implant …
Double Core Biopsy Instrumentation Kit, Thomas Tarter, Julie Tarter, Ajay Mahajan, Bradley Schwartz, Tsuchin Chu
Double Core Biopsy Instrumentation Kit, Thomas Tarter, Julie Tarter, Ajay Mahajan, Bradley Schwartz, Tsuchin Chu
Dr. Ajay Mahajan
A biopsy needle for collecting tissue samples includes a needle having a first cavity adapted for accepting a first sample core, the needle having a second cavity adapted for accepting a second sample core and a sheath with a single slot or opening and positioned coaxially with the needle. The needle with the sheath may have a separate core extraction kit.
Sensor Based Mattress/Seat For Monitoring Pressure, Temperature And Sweat Concentration To Prevent Pressure Ulcerations, Ajay Mahajan, Sumeer Lal, Jayant Nath, Bakul Dave
Sensor Based Mattress/Seat For Monitoring Pressure, Temperature And Sweat Concentration To Prevent Pressure Ulcerations, Ajay Mahajan, Sumeer Lal, Jayant Nath, Bakul Dave
Dr. Ajay Mahajan
A system for detecting conditions to prevent a bedsore includes a first sensor to detect a first condition that results in the bedsore and to output a first sensor signal from the first sensor indicative of the first condition that results in the bedsore, a controller to receive the first sensor signal and to determine if the condition may result in the bedsore and an alarm responsive to the controller to provide an alarm to indicate that the condition may result in the bedsore.
Techno-Economic Analysis Of Coal Preparation Plant Design Using Siu-Sim Simulator Techno-Economic Analysis Of Coal Preparation Plant Design Using Siu-Sim Simulator, Zhanyou Huang, Manoj Mohanty, Hasan Sevim, Ajay Mahajan, Barbara Arnold
Techno-Economic Analysis Of Coal Preparation Plant Design Using Siu-Sim Simulator Techno-Economic Analysis Of Coal Preparation Plant Design Using Siu-Sim Simulator, Zhanyou Huang, Manoj Mohanty, Hasan Sevim, Ajay Mahajan, Barbara Arnold
Dr. Ajay Mahajan
A new coal preparation plant simulator has been developed to select the most profitable cleaning circuit-configuration based on a comprehensive techno-economic analysis of the feed coal characteristics, equipment performance, capital and operating costs, depreciation, taxes, and net present value (NPV). The resulting flowsheet not only gives the maximum clean coal yield while simultaneously satisfying the product quality and quantity constraints but also generates the maximum revenue within the plant life. The simulator also identifies the optimum operating conditions for individual cleaning circuits. Two sets of feed washability data were used to demonstrate the various features and utilizations of the new …
In-Plane Deformation Measurements Using Digital Image Correlation Of Ultrasonic C-Scan Images, Bradley Regez, Ying Zhang, Tsuchin Chu, Ajay Mahajan
In-Plane Deformation Measurements Using Digital Image Correlation Of Ultrasonic C-Scan Images, Bradley Regez, Ying Zhang, Tsuchin Chu, Ajay Mahajan
Dr. Ajay Mahajan
The extension of digital image correlation method to ultrasonic C-scan acoustical speckle images of the bulk is presented in this paper. The approach discussed in this paper is ideally suited to composite materials such as particulate composites, fiber-reinforced plastics, and laminated composites. It can also be effectively employed for critical surfaces that are not within view, such as interfaces and back surfaces. Images taken prior to and after deformation are analyzed to estimate a deformation profile from changes in the image. The aim of the method is to find the displacements and strains of small subsets from the second image …
Matrix Algorithms, Volume Ii: Eigensystems, G.W. Stewart, Ajay Mahajan
Matrix Algorithms, Volume Ii: Eigensystems, G.W. Stewart, Ajay Mahajan
Dr. Ajay Mahajan
No abstract provided.
Input Design For The System Identification Idsi Of An Ultrasonic 3d Position Estimation System, Marco Schoen, Ajay Mahajan
Input Design For The System Identification Idsi Of An Ultrasonic 3d Position Estimation System, Marco Schoen, Ajay Mahajan
Dr. Ajay Mahajan
No abstract provided.
Cervigage, Ajay Mahajan, Bradley Schwartz, Leanne Schwartz
Cervigage, Ajay Mahajan, Bradley Schwartz, Leanne Schwartz
Dr. Ajay Mahajan
A measurement device for measuring the diameter and of a cervical os, including a first connector for connecting to a first portion of the cervical os, a second connector for connecting to a second portion of the cervical os, an expandable device positioned between the first connector and the second connector, and the expendable device being expandable to measure the movement of the cervical os.
Laser Resistant Calculus Retrieval Device And Method Of Using, Bradley Schwartz, Ajay Mahajan, Jarlen Don
Laser Resistant Calculus Retrieval Device And Method Of Using, Bradley Schwartz, Ajay Mahajan, Jarlen Don
Dr. Ajay Mahajan
A medical device configured to be inserted into a patient's body to retrieve calculi from the patient's body includes a basket assembly. The basket assembly is configured to transition between various states including an expanded state and a collapsed state. The basket assembly may be substantially covered in a flexible sheet except for a side facing opening when the basket assembly is in the expanded state. When the basket assembly is in the collapsed state, the side facing opening may be substantially closed. The flexible sheet may be resistant to damage from a laser. The device may be inserted into …
Universal Medical Imager, Ajay Mahajan, Gery Hsu, Sumeer Lal
Universal Medical Imager, Ajay Mahajan, Gery Hsu, Sumeer Lal
Dr. Ajay Mahajan
A medical viewing device includes a primary viewing box for displaying medical records including a first processor to control the primary viewing box, a CD/DVD driver to drive a CD/DVD which includes the medical records and a first touched screen to display the medical records. The medical viewing device further including a secondary viewing box for displaying the medical records from the primary viewing box which includes a second processor to control the secondary viewing box and a second touch screen to display the medical records from the primary viewing box.
Novel Sensor For Measuring Sodium Concentration For Dialysis Applications, L. Furby, Ajay Mahajan, Jarlen Don, Bradley Schwartz
Novel Sensor For Measuring Sodium Concentration For Dialysis Applications, L. Furby, Ajay Mahajan, Jarlen Don, Bradley Schwartz
Dr. Ajay Mahajan
One of the critical medical problems facing society today is the growing number of patients diagnosed with End-Stage Renal Disease (ESRD). Patients diagnosed with ESRD often face a problem of limited organ transplantation possibilities and time consuming, cumbersome as well as painstaking treatments that affect patients’ quality of life. This study is part of a larger effort to develop new types of dialysis treatments focused on improving the quality of life of ESRD patients. The focus of this paper is the development of a simple, yet reliable sensor that can measure the toxic ion levels in the human …