seminar topic on Optical Coherent Tomography for electronics students

In an effort to provide more detailed information about epileptic lesions in neural tissuefor the purpose of efficient removal, an Optical Coherence Tomography system was built to provide non-destructive imaging. The device is based upon the principle of a low-coherenceinterferometer. Such an instrument can detect if a particular point within a sample of tissue reflects light; an integration and interpretation of many scans of many points provides a highresolution image. The device built for this investigation has been successful in scanning semi-reflectiveobjects such as glass and glossy plastic. Objects with low reflectivity or high degrees of scattering did not produce strong enough signals to be detected successfully. One-dimensional scans were accomplished with reasonable speed and under computer control. Limited twodimensional scans were also taken with much lower speed and with constant human intervention. Optical Coherence Tomography (OCT) is an imaging technique that is similar in principle to ultrasound, but with superior resolution. It relies on exposing a sample to a burst of light and then measuring the reflective response from different depths and is therefore capable of scanning non-invasively beneath the surface of the sample. In ultrasound imaging, it is relatively easy to measure the time delay of each reflected packet. However, for light pulses, interferometry must be used to measure the displacement with meaningful accuracy. The amount of light reflected from each point within the scanning window in the sample is plotted graphically as an OCT image. The goal of this investigation is to use Optical Coherence Tomography to image epileptic lesions on cortical tissue from rats. Such images would be immensely useful for surgical purposes. They would detail how deep the lesion is, allowing for precise removal that neither removes an insufficient amount of damaged tissue nor extracts too much healthy tissue. Though commerical OCT systems already exist, they typically do not scan very deeply beneath sample surfaces. For the purpose of this study, a system must be constructed that scans up to 2 millimeters into tissue1. Unfortunately, an increase in axial depth necessitates a decrease in transverse (along the surface of the sample) resolution due to focal restrictions of the objective lenses2. However, this loss is acceptable for this investigation, as the main goal is to determine lesion depth and not to achieve perfect image clarity.

seminar topic on Plasma antenna for electronic students

On earth we live upon an island of ordinary matter. The different states of matter generally found on earth are solid, liquid, and gas. Sir William Crookes, an English physicist identified a fourth state of matter, now called plasma, in 1879. Plasma is by far the most common form of matter.


Plasma in the stars and in the tenuous space between them makes up over 99% of the visible universe and perhaps most of that which is not visible. Important to ASI s technology, plasmas are conductive assemblies of charged and neutral particles and fields that exhibit collective effects. Plasmas carry electrical currents and generate magnetic fields. When the Plasma Antenna Research Laboratory at ANU investigated the feasibility of plasma antennas as low radar cross-section radiating elements, Redcentre established a network between DSTO ANU researchers, CEA Technologies, Cantec Australasia and Neolite Neon for further development and future commercialization of this technology. The plasma antenna R & D project has proceeded over the last year at the Australian National University in response to a DSTO (Defence Science and Technology Organisation) contract to develop a new antenna solution that minimizes antenna detectability by radar. Since then, an investigation of the wider technical issues of existing antenna systems has revealed areas where plasma antennas might be useful. The project attracts the interest of the industrial groups involved in such diverse areas as fluorescent lighting, telecommunications and radar. Plasma antennas have a number of potential advantages for antenna design. When a plasma element is not energized, it is difficult to detect by radar. Even when it is energized, it is transparent to the transmissions above the plasma frequency, which falls in the microwave region. Plasma elements can be energized and de-energized in seconds, which prevents signal degradation. When a particular plasma element is not energized, its radiation does not affect nearby elements. HF CDMA Plasma antennas will have low probability of intercept( LP) and low probability of detection( LPD ) in HF communications. Plasma antennas are radio frequency antennas that employ plasma as the guiding medium for electromagnetic radiation.The concept is to use plasma discharge tubes as the antenna elements. When the tubes are energized, they become conductors, and can transmit and receive radio signals. When they are de-energised, they revert to non-conducting elements and do not reflect probing radio signals. Plasma antenna can be Steered electronically. Another feature of the plasma antenna is that it can be turned off rapidly, reducing ringing on pulse transmission.

seminar topic on Optical Coherent Tomography for electronics students

In an effort to provide more detailed information about epileptic lesions in neural tissuefor the purpose of efficient removal, an Optical Coherence Tomography system was built to provide non-destructive imaging. The device is based upon the principle of a low-coherenceinterferometer. Such an instrument can detect if a particular point within a sample of tissue reflects light; an integration and interpretation of many scans of many points provides a highresolution image. The device built for this investigation has been successful in scanning semi-reflectiveobjects such as glass and glossy plastic. Objects with low reflectivity or high degrees of scattering did not produce strong enough signals to be detected successfully. One-dimensional scans were accomplished with reasonable speed and under computer control. Limited twodimensional scans were also taken with much lower speed and with constant human intervention. Optical Coherence Tomography (OCT) is an imaging technique that is similar in principle to ultrasound, but with superior resolution. It relies on exposing a sample to a burst of light and then measuring the reflective response from different depths and is therefore capable of scanning non-invasively beneath the surface of the sample. In ultrasound imaging, it is relatively easy to measure the time delay of each reflected packet. However, for light pulses, interferometry must be used to measure the displacement with meaningful accuracy. The amount of light reflected from each point within the scanning window in the sample is plotted graphically as an OCT image. The goal of this investigation is to use Optical Coherence Tomography to image epileptic lesions on cortical tissue from rats. Such images would be immensely useful for surgical purposes. They would detail how deep the lesion is, allowing for precise removal that neither removes an insufficient amount of damaged tissue nor extracts too much healthy tissue. Though commerical OCT systems already exist, they typically do not scan very deeply beneath sample surfaces. For the purpose of this study, a system must be constructed that scans up to 2 millimeters into tissue1. Unfortunately, an increase in axial depth necessitates a decrease in transverse (along the surface of the sample) resolution due to focal restrictions of the objective lenses2. However, this loss is acceptable for this investigation, as the main goal is to determine lesion depth and not to achieve perfect image clarity.

seminar topics Embryonics for electronics students

Embryonics is embryonic electronics. Working of multicellular organization in living beings suggests that concepts from biology can be applied to development of new embryonic integrated circuits. The final objective is the development of VLSI circuits that can partially reconstruct themselves in case of a minor fault (self-repair) or completely reconstruct the original device in case of major fault (self-replication). These features are advantageous for applications depending on high reliability, like avionics and medical electronics. The basic primitive of the system is the molecule: the element of new FPGA- essentially a multiplexer associated with a programmable connection network. A finite set of molecules comprises a cell, i.e., a very simple processor associated to some memory resources. A finite set of cells comprises an organism, i.e., an application- specific multiprocessor system. The organism itself can self-replicate, giving rise to a population of identical organisms. The self-repair and self-replication are achieved by providing spare cells. This seminar report tries to bring out the basic concepts in the embryonics approach to realize VLSI circuits. 

seminar topic Quadrics network for electronic students

High performance computing (HPC) has come of age. No longer is it the preserve of computer scientists in research labs, plugging together printed circuit boards and writing new flavours of parallel operating systems. HPC is a stable, mature technology, an enabling technology for an ever increasing number of scientists and researchers wishing to build and run computational models in their own particular disciplines. HPC has finally delivered on its promises. Here we take a look at the current state of high performance computing from the perspective of the European user community, and assess the needs and aspirations of this community in terms of where HPC might be going, and where, perhaps, it should be going. We aim to capture a snapshot of HPC activities, from the technology itself through related services to the direct views of its European user base, and attempt to draw the whole together into some form of roadmap for large scale computing in the twenty-first century. Quadrics Supercomputer World (QSW) offer a PCI-compatible high-performance ``fat tree interconnect based on the original Meiko Computing Surface network. Called QsNet and built from QSW s Elan III network chips and Elite III switch chips, it offers some of the highest performance currently available in cluster networking systems. The QsNet network is currently used inside the UltraSPARC-II-based QM-1, and QSW plans to produce systems in partnership with Compaq in the third quarter of 1999; the first of these will be the Compaq ``Sierra . It is as yet unclear whether QSW intend to make the QsNet technology available as an ``off-the-shelf networking product. QsNet consists of two hardware building blocks: a programmable network interface called Elan and a high-bandwidth, low-latency communication switch called Elite. Elite switches can be interconnected in a fat-tree topology. With respect to software, QsNet provides several layers of communication libraries that trade off between performance and ease of use. QsNet combines these hardware and software components to implement efficient and protected access to a global virtual memory via remote direct memory access (DMA) operations. It also enhances network fault tolerance via link level and end to end protocols that detect faults and automatically retransmit packets. 

seminar topic Freenet for electronics students

Networked computer systems are rapidly growing in importance as the medium of choice for the storage and exchange of information. However, current systems afford little privacy to their users, and typically store any given data item in only one or a few fixed places, creating a central point of failure. Because of a continued desire among individuals to protect the privacy of their authorship or readership of various types of sensitive information, and the undesirability of central points of failure which can be attacked by opponents wishing to remove data from the system or simply overloaded by too much interest, systems offering greater security and reliability are needed. Freenet is being developed as a distributed information storage and retrieval system designed to address these concerns of privacy and availability. The system operates as a location-independent distributed file system across many individual computers that allow files to be inserted, stored, and requested anonymously. There are five main design goals: Anonymity for both producers and consumers of information Deniability for storers of information Resistance to attempts by third parties to deny access to information Efficient dynamic storage and routing of information Decentralization of all network functions The system is designed to respond adaptively to usage patterns, transparently moving, replicating, and deleting files as necessary to provide efficient service without resorting to broadcast searches or centralized location indexes. It is not intended to guarantee permanent file storage, although it is hoped that a sufficient number of nodes will join with enough storage capacity that most files will be able to remain indefinitely. In addition, the system operates at the application layer and assumes the existence of a secure transport layer, although it is transport-independent. It does not seek to provide anonymity for general network usage, only for Freenet file transactions. Freenet is currently being developed as a free software project on http://sourceforge.net, and a preliminary implementation can be downloaded from http://www.freenetproject.org. It grew out of work originally done by the first author at the University of Edinburgh. There are many reasons why people get involved in the Freenet Project. Some share the views outlined in this document; some share variations of these views, which are also served by what we are trying to achieve; and some just enjoy the technical challenge. These are the ideas which motivated me to join the Freenet project system in the first place, but not necessarily the views that everyone involved in the Freenet project holds.

seminar topic Leo Satellite for electronic students

In the present age of open economy, communication is rated as the infrastructure of infrastructures. This infrastructural era has passed through three different phases since the inventions of Morse s telegraphy and Graham Bell s telephony made nearly a century ago: Communication by connecting geographical points:Wired telephony, telegraphy, and fax are the examplesof this phase.

Communication by connecting machines rather than geographical locations or points: The cellular mobile telephony, paging, and cordless telephony are the examples of this phase. Wireless mode of communication and the support of mobility of machines are characteristics of this phase.

Communication by connecting people rather than geographic points or machines: This is the phase of personal communication, which is believed to be near-natural communication with value-added services. Personal communication is characterised by the PTN/UTN technique, the global coverage technology and the personal mobility (via wireless) technology. It facilitates a person to communicate with another person anywhere in the world, at any time with a single device.

and a single personal telecommunication number (PTN) or a universal telecommunication number. (UTN). It is understood that satellite communication in general and LEO (low earth orbit) satellite communication in particular shall be the major technology behind development process of personal communication. Satellite communication is driven by two important philosophies: First, that satellite is synonymous with wide-area coverage, including global coverage, and two, that satellite also means wireless communication, which supports man-machine mobility. It is interesting to note that both the required technologies related to personal communication are met with satellite communication. 

seminar on 3D optical Data Storage Technology for electronic students

The growth in demand for digital storage capacity exceeds 60% per annum. Facilities such as storage area networks, data warehouses, supercomputers and e-commerce related data mining, require ever-greater capacity in order to handle the volume of data to be processed. In addition, with the advent of high bandwidth Internet and data intensive applications such as High Definition TV (HDTV) and Video & Music On Demand, even smaller devices such as Personal VCRs, PDAs, mobile phones, etc. Will in the next couple of years demand multi-gigabyte and terabyte capacities. Not less important, is the growing demand for faster data access and reading. For instance High Definition TV and Video & Music on Demand applications require over terabit/sec reading speed. Such and higher speed in conjunction with huge capacity can be implemented only by means of parallel access to any part of information on the carrier.

In the year 2000, one (1) ExaByte (ID^18 Bytes) of information will be stored, growing to more than two (2) ExaBytes by the year 2002. Approximately 10% of the information will be stored on magnetic disk drives (HDD), with the remainder on tapes, optical discs and paper. This increasing capacity demand has thus far, been met through steady increases in the areal density of the magnetic and optical recording media.

While the limits of magnetic recording are still being debated-recently 35 Gbit/sqi has been demonstrated-the limits of conventional optical storage are well understood. Current optical storage technology is working close to the diffractionlimits (5 Gbit/sqi).

Future increases in density are possible by taking advantage of shorter wavelength lasers, higher lens numerical aperture (NA), or by employing Near Field techniques. Finally, optical data storage capacities have been increased by creating double-sided media. Another approach to increasing the effective storage capacity is quite unique for optical memory technologies. This is three-dimensional storage.

True three-dimensional optical storage opens up another dimensional in which to increase the capacity of a given volume of media, with the objective of achieving a cubic storage element having the dimensions of the writing/reading laser wavelength. Even with current wavelengths of 650um, this should surface to store up to a Terabit per cubic centimeter.

Holographic memory is developing technology that has promised to revolutionaries the storage systems. It can store data upto 1 Tb in a sugar cube sized crystal. Data from more than 1000 CDs can fit into a holographic memory System. Most of the computer hard drives available today can hold only 10 to 40 GB of data, a small fraction of what holographic memory system can hold. Conventional memories use only the surface to store the data. But holographic data storage systems use the volume to store data. It has more advantages than conventional storage systems. It is based on the principle of holography.

Scientist Pieter J. van Heerden first proposed the idea of holographic (three-dimensional) storage in the early 1960s. A decade later, scientists at RCA Laboratories demonstrated the technology by recording 500 holograms in an iron-doped lithium-niobate crystal and 550 holograms of high-resolution images in a light-sensitive polymer material. The lack of cheap parts and the advancement of magnetic and semiconductor memories placed the development of holographic data storage on hold. 

seminar on Communication Onboard High-Speed Public Transport Systems for electronic students

Mobile wireless communication services have penetrated into many people s daily works and lives. The contents of communication have also shifted from voice-dominating applications to multimedia services.

A common feature people traveling onboard high-speed public transport vehicles is that their journeys last for hours or even days. They would like to make use of these few hours to make telephone calls, read/send e-mails, browse a website or catch up on some work. There are also passengers who wish to have real on-demand entertainment services including music, movies, and games. Although compared to 10 years ago, onboard communication and entertainment services have improved a great deal in terms of convenience, style and content, a truly personalized environment is still in its infancy.

Only satellite telephones are accessible. Most entertainment programs are carried onboard. Only very limited news or sports programs are broadcast real-time directly from satellite. This is because the technology is not quite there to make it happen. Before taking a look at the latest technologies available for facilitating communication onboard the high-speed vehicles, let s take a look at the history of mobile communication.

seminar topic Nanotechnology Assembler Design And Nano-Communication for electronic students

Nanotechnology is nothing but the manipulation of matter at atomic level. Working at this level means better precision, complete usage and everlasting qualities. This way it can be applied in any field, viz. production, research, industry, consumer-friendly, applications ,…Nanotechnology is the outcome of the excellent conglomeration of human thinking, technology and molecular behavior.

By arranging the atoms in sequences or structures of our choice, we can build a wonderful, devoid of defects, illness… The consequences of this technology are nothing but our imagination. Whatever we intend, we can achieve, using this miraculous technology..

A practical approach to the implementation is being taken up in this paper about the Nano-Communication System .

seminar topic on GSM Security and Encryption for electronic students

The motivations for security in cellular telecommunications systems are to secure conversations and signaling data from interception as well as to prevent cellular telephone fraud. With the older analog-based cellular telephone systems such as the Advanced Mobile Phone System (AMPS) and the Total Access Communication System (TACS), it is a relatively simple matter for the radio hobbyist to intercept cellular telephone conversations with a police scanner.

A well-publicized case involved a potentially embarrassing cellular telephone conversation with a member of the British royal family being recorded and released to the media. Another security consideration with cellular telecommunications systems involves identification credentials such as the Electronic Serial Number (ESN), which are transmitted in the clear in analog systems. With more complicated equipment, it is possible to receive the ESN and use it to commit cellular telephone fraud by cloning another cellular phone and placing calls with it. Estimates for cellular fraud in the U.S. in 1993 are as high as $500 million. The procedure wherein the Mobile Station (MS) registers its location with the system is also vulnerable to interception and permits the subscriber s location to be monitored even when a call is not in progress, as evidenced by the recent highly-publicized police pursuit of a famous U.S. athlete.

The security and authentication mechanisms incorporated in GSM make it the most secure mobile communication standard currently available, particularly in comparison to the analog systems described above. Part of the enhanced security of GSM is due to the fact that it is a digital system utilizing a speech coding algorithm, Gaussian Minimum Shift Keying (GMSK) digital modulation, slow frequency hopping, and Time Division Multiple Access (TDMA) time slot architecture. To intercept and reconstruct this signal would require more highly specialized and expensive equipment than a police scanner to perform the reception, synchronization, and decoding of the signal. In addition, the authentication and encryption capabilities discussed in this paper ensure the security of GSM cellular telephone conversations and subscriber identification credentials against even the determined eavesdropper. 

seminar on Spin Valve Transistor for electronic students

In a world of ubiquitous presence of electrons can you imagine any other field displacing it? It may seem peculiar, even absurd, but with the advent of spintronics it is turning into reality.

In our conventional electronic devices we use semi conducting materials for logical operation and magnetic materials for storage, but spintronics uses magnetic materials for both purposes. These spintronic devices are more versatile and faster than the present one. One such device is spin valve transistor.

Spin valve transistor is different from conventional transistor. In this for conduction we use spin polarization of electrons. Only electrons with correct spin polarization can travel successfully through the device. These transistors are used in data storage, signal processing, automation and robotics with less power consumption and results in less heat. This also finds its application in Quantum computing, in which we use Qubits instead of bits.

Spintronics came into light by the advent of Giant Magneto Resistance (GMR) in 1988. GMR is 200 times stronger than ordinary Magneto Resistance. It results from subtle electron - spin effects in ultra multilayers of magnetic materials that cause a huge change in electrical resistance. 

seminar on Border Security Using Wireless Integrated Network Sensors (WINS) for electronic students

BORDER SECURITY USING WIRELESS INTEGRATED NETWORK SENSORS (WINS) Wireless Integrated Network Sensors (WINS) now provide a new monitoring and control capability for monitoring the borders of the country. Using this concept we can easily identify a stranger or some terrorists entering the border.

The border area is divided into number of nodes. Each node is in contact with each other and with the main node. The noise produced by the foot-steps of the stranger are collected using the sensor. This sensed signal is then converted into power spectral density and the compared with reference value of our convenience. Accordingly the compared value is processed using a microprocessor, which sends appropriate signals to the main node. Thus the stranger is identified at the main node.

A series of interface, signal processing, and communication systems have been implemented in micro power CMOS circuits. A micro power spectrum analyzer has been developed to enable low power operation of the entire WINS system. 

seminar on Data Security in Local Network using Distributed Firewalls for electronic students

Distributed firewalls are host-resident security software applications that protect the enterprise network s servers and end-user machines against unwanted intrusion. They offer the advantage of filtering traffic from both the Internet and the internal network. This enables them to prevent hacking attacks that originate from both the Internet and the internal network. This is important because the most costly and destructive attacks still originate from within the organization.

They are like personal firewalls except they offer several important advantages like central management, logging, and in some cases, access-control granularity. These features are necessary to implement corporate security policies in larger enterprises. Policies can be defined and pushed out on an enterprise-wide basis.

A feature of distributed firewalls is centralized management. The ability to populate servers and end-users machines, to configure and push out consistent security policies helps to maximize limited resources. The ability to gather reports and maintain updates centrally makes distributed security practical. Distributed firewalls help in two ways. Remote end-user machines can be secured . Secondly, they secure critical servers on the network preventing intrusion by malicious code and jailing other such code by not letting the protected server be used as a launch pad for expanded attacks. 

seminar on Multimedia messaging Service for electronic students

A picture says more than a thousand words and is more fun to look at!!! . Everyone in this world believes in this quote. And this is also one of the main quotes that inspired mobile developers who gave this hot technology -MMS.

MMS, Multimedia Messaging Service, is a standardized messaging service. It traced its roots from SMS (Short Messaging Services) and EMS (Enhanced Messaging Services) .MMS will allow users to send and receive messages exploiting the whole array of media types available today, e.g. text, images, audio, and video, text.

Graphics, data, animations, while also making it possible to support new content types as they become popular. With MMS, for example, users could send each other personal pictures together with a voice message, such as a greeting card with a picture, handwritten message, and a personal song or sound clip that has been recorded by the user itself. Video conferencing, which is expected to make a great impact in the future, is also possible with this technology. Using the Wireless Application Protocol (WAP) as bearer technology and powered by the high-speed transmission technologies EDGE, GPRS and UMTS (WCDMA), Multimedia Messaging allows users to send and receive messages that look like PowerPoint-style Presentations.

MMS supports standard image formats such as GIF and JPEG, video formats such as MPEG 4, and audio formats such as MP3, MIDI and WAV, also the new AMR.

The greatest advantage of MMS is its ability to interact with mobile to mobile terminals as well as with mobile to PDA Laptop Internet and other data devices.

MMS can also act as a virtual email client. Greatly anticipated by young users in particular, MMS is projected to fuel the growth of related market segments by as much as forty percent.

A picture says more than a thousand words and is more fun to look at!!! . Everyone in this world believes in this quote. And this is also one of the main quotes that inspired mobile developers who gave this hot technology -MMS.

MMS, Multimedia Messaging Service, is a standardized messaging service. It traced its roots from SMS (Short Messaging Services) and EMS (Enhanced Messaging Services) .MMS will allow users to send and receive messages exploiting the whole array of media types available today, e.g. text, images, audio, and video, text.

Graphics, data, animations, while also making it possible to support new content types as they become popular. With MMS, for example, users could send each other personal pictures together with a voice message, such as a greeting card with a picture, handwritten message, and a personal song or sound clip that has been recorded by the user itself. Video conferencing, which is expected to make a great impact in the future, is also possible with this technology. Using the Wireless Application Protocol (WAP) as bearer technology and powered by the high-speed transmission technologies EDGE, GPRS and UMTS (WCDMA), Multimedia Messaging allows users to send and receive messages that look like PowerPoint-style Presentations.

seminar topic The Architecture of a Moletronics Computer for electronic students

Some novel designs for several such simple molecular electronic digital logic circuits: a complete set of three fundamental logic gates: (AND, OR, and XOR gates), plus and adder function built up from the gates via the well-known combinational logic, was demonstrated. This means in coming future, this technology could be a replacement for VLSI. However, currently, this technology is only available under lab condition. How to mass product moletronic chips is still a big problem.

Currently, integrated circuits by etching silicon wafers using beam of light. It s the VLSI lithography-based technology makes mass production of Pentium III processor possible. But as the size of logic block goes to nano-scale, this technology no long available. As wavelength get too short, they tend to become X-rays and can damage the micro structure of molecules.

On the other hand, the mask of lithography of Pentium III is so complex, and the shape and the dimension of its logic block varies so much. Looking at currently available integrated circuits, the transistor density of memory chip are much higher than processor chip, the reason is that the cell of memory is much more simple than circuit of processor.

Because, except the decoding logic, most of the memory bit cell is the same. Could we find a way to fabricate complex logic circuit as Pentium processor using million of same logic units? The PLD(Programmable Logic Devices) is the answer. The paper is organized as following: section II presents some basic of moletronic gate circuit. section III uses PLD technology to build more complex blocks. section IV shows the nanotube can be used for interconnection wires.

seminar topic Palladium cryptography for electronic students

As we tend towards a more and more computer centric world, the concept of data security has attained a paramount importance. Though present day security systems offer a good level of protection, they are incapable of providing a trust worthy environment and are vulnerable to unexpected attacks.

Palladium is a content protection concept that has spawned from the belief that the pc, as it currently stands, is not architecturally equipped to protect a user forms the pitfalls and challenges that an all-pervasive network such as the Internet poses.

As a drastic change in pc hardware is not feasible largely due to economic reasons, palladium hopes to introduce a minimal change in this front. A paradigm shift is awaited in this scenario with the advent of usage of palladium, thus making content protection a shared concern of both software and hardware. In the course of this paper the revolutionary aspects of palladium are discussed in detail.

A case study to restructure the present data security system of JNTU examination system using palladium is put forward.

seminar topic on The TIGER SHARC Processor for electronic students

The Tiger SHARC processor is the newest and most power member of this family which incorporates many mechanisms like SIMD, VLIW and short vector memory access in a single processor. This is the first time that all these techniques have been combined in a real time processor.

The TigerSHARC DSP is an ultra high-performance static superscalar architecture that is optimized for tele-communications infrastructure and other computationally demanding applications.

This unique architecture combines elements of RISC, VLIW, and standard DSP processors to provide native support for 8, 16, and 32-bit fixed, as well as floating-point data types on a single chip.

Large on-chip memory, extremely high internal and external bandwidths and dual compute blocks provide the necessary capabilities to handle a vast array of computationally demanding, large signal processin tasks. 

seminar topic on Iontophoresis for electronic students

The method of iontophoresis was described by Pivati in 1747.Galvani and Volta, two well-known scientists working in the 18th century, combined the knowledge that electricity can move different metal ions, and that movements of ions produce electricity. The method of administrating pharmacological drugs by iontophoresis became popular at the beginning of the 20th century due to the work of Leduc (1900) who introduce the word iontotherapy and formulated the laws for this process.

Iontophoresis is defined as the introduction by means of a direct electrical current, of ions of soluble salts into the tissues of the body for therapeutic purposes. It is a technique used to enhance the absorption of drugs across biological tissues, such as the skin. Another method for drug delivery through the skin, called phonophoresis, uses ultrasound instead of an electric current. Both these techniques are complicated because of other processes that occur simultaneously with the delivery of the drug. With the present knowledge about these processes, it is easier to select and prepare appropriate drugs and vehicles for iontophoresis than for phonophoresis.

In clinical practice, iontophoresis devices are used primarily for the treatment of inflammatory conditions in skin, muscles, tendons and joints, such as in temperomandibular joint dysfunctions. More recently, iontophoresis has been used in combination with laser Doppler technology as a diagnostic tool in diseases comprising the vascular bed. 

seminar topic Tunable lasers for electronic students

Tunable lasers are still a relatively young technology, but as the number of wavelengths in networks increases so will their importance. Each different wavelength in an optical network will be separated by a multiple of 0.8 nanometers (sometimes referred to as 100GHz spacing. Current commercial products can cover maybe four of these wavelengths at a time.

While not the ideal solution, this still cuts your required number of spare lasers down. More advanced solutions hope to be able to cover larger number of wavelengths, and should cut the cost of spares even further.

The devices themselves are still semiconductor-based lasers that operate on similar principles to the basic non-tunable versions. Most designs incorporate some form of grating like those in a distributed feedback laser. These gratings can be altered in order to change the wavelengths they reflect in the laser cavity, usually by running electric current through them, thereby altering their refractive index. The tuning range of such devices can be as high as 40nm, which would cover any of 50 different wavelengths in a 0.8nm wavelength spaced system. Technologies based on vertical cavity surface emitting lasers (VCSELs) incorporate moveable cavity ends that change the length of the cavity and hence the wavelength emitted. Current designs of tunable VCSELs have similar tuning ranges.