bioinstrumentation: Paper presentation

Some Definitions:
Measurand: the physical property being investigated Sensor: converts the measurand into an electrical signal
Analog processing: conditions the signal in the analog domain, typically amplification, electrical isolation, filtering
A/D: analog to digital conversion at a specified sampling frequency and precision
Digital processing: conditions the signal in the digital domain, typically, filtering, compression,  enhancements such as digital zoom and contrast enhancement 
Display: organizes the information in a manner understandable to the user, the user interface
Storage: e.g. disk or paper output
D/A: converts a digital signal (based on some reaction to the original analog signal) back
to the analog domain
Actuator: converts and electrical signal into a mechanical action.
Example: A treatment system that controls a laser based on tissue damage. What are the
various pieces in this system?
More definitions, based on operation of instrumentation
Direct: a measurement of the quantity of interest (e.g. measure finger length)
Indirect: a measurement of a quantity related to the quantity of interest (e.g. measurement
of an X-ray of a finger)

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Energy Harvesting in Silicon Photonics

Abstract: 
Two-photon absorption is the central problem in silicon photonic devices. Two-photon photovoltaic effect can be used to harvest the lost optical power into useful electrical power. Silicon is on the verge of becoming the material of choice for certain photonic applications . Much progress has been made in this field towards low-loss waveguides, photodetectors, electro-optic modulators, light sources and optical amplifiers. However, not much attention has been paid to the power dissipation of these photonic devices.
With the chip power dissipation already being the primary problem faced by the VLSI industry, high power consumption of photonic devices will undoubtedly diminish the prospects of their integration with CMOS electronics. The power dissipation of silicon photonic devices is therefore of paramount importance if they are to be compatible with CMOS VLSI technology.


Paper on Solar Inverters

Grid-interactive Solar Inverters and Their Impact on Power System Safety and Quality

Objectives
•Introduction to PV Solar Industry.
•Grid Interactive Solar Inverter Design.
•Impact on Grid Safety.
•Impact on Grid Quality.
•Site Installations.
•Challenges.
•Future Developments.
•Conclusions.

Auto-Wakeup.
–Maximum Power Point Tracking.
–DC Bus Over Voltage handling
–DC Bus Over Current handling
–Optimum Efficiency operation.
–Outdoor condition design. Wide ambient temperature range and AC DC surge protection.
–Design to perform well under rapid cloud movement.
–Remote monitoring.
–Monitoring Weather parameters (humidity, wind velocity, insolation level, and temperature) desirable.

Solar Inverter: paper presentation

Transformerless Solar Inverter

H-bridge inverter
The H-bridge works by asymmetric unipolar modulation. The high side of the asymmetric H-bridge should be driven by 50Hz half-wave dependent on the polarity of the mains while the opposite low side is PWM modulated to form the mains sinusoidal shape.
The 10nF ceramic capacitor (C5) should be placed close to the gate-emitter pins of the high side transistors to eliminate cross through conduction due to fast switching of the low side transistors. A negative gate turn off voltage on the high side gate may also improve switching performance. The low side gate drive resistor should be selected to adjust the speed of MOSFET switching.


Paper presentation AC Drives

AC induction motors are commonly used in industrial applications. The following motor discussion will center around three-phase, 460 VAC, asynchronous, induction motors. An asynchronous motor is a type of motor where the speed of the rotor is other than the speed of the rotating magnetic field. This
type of motor is illustrated. Electromagnetic stator windings are mounted in a housing. Power connections, attached to the stator windings, are brought out to be attached to a three-phase
power supply. On three-phase, dual-voltage motors nine leads are supplied for power connections. Three power connection leads are shown in the following illustration for simplicity. A rotor is mounted on a shaft and supported by bearings. On self-cooled motors, like the one shown, a fan is mounted on the shaft to force cooling air over the motor.

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Mechanical Basics .
AC Motor Construction.
Developing A Rotating Magnetic Field..
Rotor Construction .
NEMA Rotor Characteristics.
Electrical Components Of A Motor.
Voltage And Frequency .
Basic AC Drives .
Siemens MICROMASTER .
Siemens MASTERDRIVE.
MASTERDRIVE Compact, Chassis, and Cabinet Units.
MASTERDRIVE Compact Plus.
Parameters and Function Blocks .
Applications .
Constant Torque Applications.
Variable Torque Applications.
Constant Horsepower Applications .
Multimotor Applications.

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Routing in VLSI Design and Communication Networks

Global routing in VLSI design and multicast routing in communication networks:
 
• integer linear programming formulation;
• approximation algorithms for min-max resource-sharing problems;
• block problems and virtual layer method;
• results and more applications;
• future work.

Theorem: There is a polynomial time algorithm for the shortest path problem in lattice graphs, where the total cost is the sum of edge costs and the bend-dependent vertex costs. 
 
Theorem: There is a polynomial time algorithm for the splitable min-cost flow problem in lattice graphs, where the total cost is the sum of edge costs and the bend-dependent vertex costs.

Theorem: There is a polynomial time algorithm for the splitable min-cost multicommodity flow problem in lattice graphs, where the total cost is the sum of edge costs and the bend-dependent vertex costs.


Digital image processing: Paper presentation

•Unlike Fourier transform, whose basis functions are sinusoids, wavelet transforms are based on small waves, called wavelets, of limited duration.
•Fourier transform provides only frequency information, but wavelet transform provides time-frequency information.
•Wavelets lead to a multiresolution analysis of signals.
•Multiresolution analysis: representation of a signal (e.g., an images) in more than one resolution/scale.
•Features that might go undetected at one resolution may be easy to spot in another.


Download this paper at: http://goo.gl/Ohcl9

Paper presentation on image processing

Today we’ll look at colour image processing, covering:
–Colour fundamentals
–Colour models 
 
In the RGB model each colour appears in its primary spectral components of red, green and blue
The model is based on a Cartesian coordinate system  –RGB values are at 3 corners – Cyan magenta and yellow are at three other corners  – Black is at the origin – White is the corner furthest from the origin –Different colours are points on or inside the cube represented by RGB vectors

 
 
 
 
 
 

Paper on Brushless DC motor

Shift-by-Wire is about replacing the mechanical link between the automatic transmission and the shift lever with an electromechanical system. This will make new safety functions possible and assist the driver in other ways. To do this, an actuator with a brushless DC motor is built into the transmission. It controls the position of the shift valve, which decides the driving position. This thesis concerns the controlling of the brushless DC motor. This is done by programming a shift control unit with a Motorola HC12 microcontroller. The performance of the motor is then tested and evaluated.

Keywords: Brushless DC motor, Shift-by-Wire, Automatic transmission, Hall sensors, Pulse width modulation.

By applying the potent combination of BLDC technology and DSP technology, OEM’s can bring to their customers innovative and advanced features. Applications which were cost prohibitive for the consideration of BLDC motors just a few years ago are not only viable today but also are thriving on the competitive advantages brought forward by the BLDC technology. Conversely if OEM’s ignore the advantages of technology, they run the risk of being over taken by their competition.


Information Science by David G. Luenberger

Information Science by David G. Luenberger



Information Science [Hardcover] by David G. Luenberger
Hardcover: 448 pages
Publisher: Princeton University Press (March 27, 2006)
Language: English
ISBN-10: 0691124183
ISBN-13: 978-0691124186
Product Dimensions: 10.1 x 7.9 x 1.5 inches
Shipping Weight: 2.7 pounds

product description

This original, integrative book is a tour de force, unique in content and presentation. The author has achieved the goal that all academics should strive for: the ability to develop and explain complex ideas in the simplest way without compromising theory or being simplistic.

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