Heliodisplay

ABSTRACT

The Heliodisplay is a free-space display developed by IO2 Technology. A projector is focused onto a layer of mist in mid-air, resulting in a two-dimensional display that appears to float. This is similar in principle to the cinematic technique of rear projection. As dark areas of the image may appear invisible, the image may be more realistic than on a projection screen, although it is still not volumetric. Looking directly at the display, one would also be looking into the projector’s light source. The necessity of an oblique viewing angle (to avoid looking into the projector’s light source) may be a disadvantage. Heliodisplay can work as a free-space touchscreen when connected to a PC by a USB cable. A PC sees the Heliodisplay as a pointing device, like a mouse. With the supplied software installed, one can use a finger, pen, or another object as cursor control and navigate or interact with simple content. The mist is formed by a series of metal plates, and the original Heliodisplay could run for several hours on one litre of tap water. 2008 model Heliodisplays use 80 mml to 120 ml of water per hour, depending on screen size and user settings, and can be built with any size water tank. The Heliodisplay was invented by Chad Dyner, who built it as a five-inch prototype in his apartment before patenting the free-space display technology, and founding IO2 Technology LLC to further develop the product.

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Issues of Routing IN VANET

ABSTRACT

Vehicular Ad Hoc Network (VANET) is a sub class of mobile ad hoc networks. VANET provides wireless communication among vehicles and vehicle to road side equipments. The communication between vehicles is used for safety, comfort and for entertainment as well. The performance of communication depends on how better the routing takes place in the network. Routing of data depends on the routing protocols being used in network. In this study different ad hoc routing protocols for VANET are studied. The main aim of this study is to identify which ad hoc routing method has better performance in highly mobile environment of VANET. To measure the performance of routing protocols in VANET, two different scenarios i.e. city and highway are considered. Routing protocols were selected carefully after carrying out literature review. The selected protocols were then evaluated through simulation in terms of performance metrics i.e. throughput and packet drop. After simulation results, MATLAB can be used to plot the graph to compare the results of selected routing protocols with each other.

From the results, it is observed that A-STAR shows better performance in terms of high throughput and low packet drop as compared to AODV and GPSR in city environment, while GPSR shows better performance as compared to AODV in both highway and city environment of VANET. Based on the results of performance metrics in different environments of VANET, it is realized that position based routing method of VANET outperformed the traditional ad hoc topology based routing. In VANET the protocol performance depends on vehicle speed, driving environment etc. that may vary from one environment of network to another.

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Touch Screens With Feelings

ABSTRACT

This seminar includes the theory, design and construction of a haptic display for creating texture sensations through variations in surface friction. Ultra sonic frequency, low amplitude vibrations between two flat plates have been shown to create a squeeze film of air between the two plate surfaces thereby reducing the friction. Here, it is shown that a reduction of friction will also occur between a human finger and a vibrating plate. Thus, a vibrating plate can serve as a haptic interface. The amplitude of vibration can also be correlated to the amount of friction reduction the plate and the finger. Varying the surface friction between the finger and the haptic interface is a way of indirectly controlling shear forces on the finger during active exploration. Using finger position and velocity feedback on the display allows for the creation of spatial texture sensations.

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Wearable Health Care System on Textile Platform

ABSTRACT

A comfortable health monitoring system is based on a wearable interface implemented by integrating fabric sensors, advanced signal processing techniques and modern telecommunication systems, on a textile platform. Conducting and piezoresistive materials in form of fiber and yarn are integrated in a garment and used as sensors, connectors and electrode elements. Simultaneous recording of vital signs allows extrapolation of more complex parameters and inter-signal elaboration that contribute to produce alert message and synoptic patient table. The system is designed to be minimally invasive, comfortable and wearable, where the knitted fabric sensors and electrodes are distributed and connected to an electronic portable unit, the acquired signals can then be transmitted to a monitoring system.

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Femtocells Technology

ABSTRACT

      Femtocells, a technology little-known outside the wireless world, promise better indoor cellular service. In telecommunication, a Femtocell is a small cellular base station, typically designed for use in a home or small business. It connects to the service provider’s network via broadband. Current designs typically support 2 to 4 active mobile phones in a residential setting, and 8 to 16 active mobile phones in enterprise settings. A Femtocell allows service providers to extend service coverage indoors, especially where access would otherwise be limited or unavailable. For a mobile operator, the attractions of a Femtocell are improvements to both coverage and capacity, especially indoors. This can reduce both capital expenditure and operating expense.

      A Femtocell is typically the size of a residential gateway or smaller, and connects into the end-user’s broadband line. Once plugged in, the Femtocell connects to the MNO’s mobile network, and provides extra coverage in a range of typically 30 to 50 meters for residential Femtocells.

      The end-user must declare which mobile phone numbers are allowed to connect to his/her Femtocell, usually via a web interface provided by the MNO. When these mobile phones arrive under coverage of the Femtocell, they switch over from the Macrocell (outdoor) to the Femtocell automatically. Most MNOs provide means for the end-user to know this has happened, for example by having a different network name appear on the mobile phone. All communications will then automatically go through the Femtocell. When the end-user leaves the Femtocell coverage (whether in a call or not), his phone hands over seamlessly to the macro network.

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Maemo

ABSTRACT

Maemo is a software platform developed by Nokia for smartphones and Internet Tablets. It is based on the Debian Linux distribution. The platform comprises the Maemo operating system and the Maemo SDK.

Maemo is mostly based on open source code, and has been developed by Maemo Devices within Nokia in collaboration with many open source projects such as the Linux kernel, Debian, and GNOME. Maemo is based on Debian GNU/Linux and draws much of its GUI, frameworks, and libraries from the GNOME project. It uses the Matchbox window manager, and the GTK-based Hildon as its GUI and application framework.

The UI in Maemo 4 is similar to many handheld interfaces, and features a “Home” screen, which acts as a central point from which all applications and settings are accessed. The Home Screen is divided into areas for launching applications, a menu bar, and a large customisable area that can display information such as an RSS reader, Internet radio player, and Google search box.

The Maemo 5 UI is slightly different: The menu bar and info area are consolidated to the top of the display, and the four desktops can be customized with shortcuts and widgets.

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Embedded OS for Real-Time Applications

ABSTRACT

The advent of microprocessors has opened up several product opportunities that simply did not exist earlier. These intelligent processors have invaded and embedded themselves into all fields of our lives be it the kitchen (food processors, microwave ovens), the living rooms (televisions, air conditioners) or the work places (fax machines, pagers, laser printer, credit card readers) …etc.

As the complexities in the embedded applications increase, use of an operating system brings in lot of advantages. Most embedded systems also have real-time requirements demanding the use of Real time Operating Systems (RTOS) capable of meeting the embedded system requirements. Real-time Operating System allows realtime applications to be designed and expanded easily. The use of an RTOS simplifies the design process by splitting the application code into separate tasks. An RTOS allows one to make better use of the system recourses by providing with valuable services such as semaphores, mailboxes, queues, time delays, time outs…etc.

This report looks at the basic concepts of embedded systems, operating systems and specifically at Real Time Operating Systems in order to identify the features one has to look for in an RTOS before it is used in a real-time embedded application. Some of the popular RTOS have been discussed in brief, giving their salient features, which make them suitable for different applications.

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Zone Based Ant Colony Routing In MANET

ABSTRACT

Ant colony optimization (ACO) is a stochastic approach for solving combinatorial optimization problems like routing in computer networks. The idea of this optimization is based on the food accumulation methodology of the ant community. Position based routing algorithms (POSANT) had some significant loopholes to find route like it never guarantees the route would be the shortest one, in cases while it is able to find it. The routing algorithms which are based on ant colony optimization find routing paths that are close in length to the shortest paths. The drawback of these algorithms is the large number of control messages that needs to be sent or the long delay before the routes are established from a source to a destination.This paper presents a new routing algorithm for mobile ad hoc network by combining the concept of Ant Colony approach and Zone based routing approach using clustering to get shortest path with small number of control messages to minimize the overhead. Also this shows that zone based ant colony routing algorithm using cluster is more efficient than POSANT routing algorithm by comparative Overhead study of POSANT and Zone based Ant using clustering concept with respect to varying Node Number, Zone Size and Mobility.

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Audio CAPTCHA: Existing solutions assessment and a new implementation for VoIP telephony

ABSTRACT

SPam over Internet Telephony (SPIT) is a potential source of future annoyance in Voice over IP (VoIP) systems. A typical way to launch a SPIT attack is the use of an automated procedure (i.e., bot), which generates calls and produces unsolicited audio messages. A known way to protect against SPAM is a Reverse Turing Test, called CAPTCHA (Completely Automated Public Turing Test to Tell Computer and Humans Apart). In this paper, we evaluate existing audio CAPTCHA, as this type of format is more suitable for VoIP systems, to help them fight bots. To do so, we first suggest specific attributes-requirements that an audio CAPTCHA should meet in order to be effective. Then, we evaluate this set of popular audio CAPTCHA, and demonstrate that there is no existing implementation suit-able enough for VoIP environments. Next, we develop and implement a new audio CAPTCHA, which is suitable for SIP-based VoIP telephony. Finally, the new CAPTCHA is tested against users and bots and demonstrated to be efficient.

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Trends in Optical Switching Techniques

ABSTRACT

We are currently witnessing a strong worldwide push toward bringing fiber closer to individual homes and businesses. The emerging FTTX access networks will move the bandwidth bottleneck from the first/last mile toward metropolitan and wide area networks, creating a need for efficient optical-switching mechanisms. In this article, we review the current trends in optical switching that help to improve the bandwidth efficiency, as well as to decrease the cost and power consumption of next-generation optical networks. Our review provides an overview of the optical switching domain and facilitates the understanding of newly emerging switching techniques and their interpretation as derivatives of the presented main optical switching trends.

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