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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Fluorescent Multilayer Disc (FMD)

ABSTRACT

Compact discs were a revolutionary product at its time and influenced many spheres of human activity. People started recording music of high quality, which didn’t get worse with the time as it happens to be on tape. As soon as CDs appeared in computer industry they immediately became an undoubted helper both for users and for programmers. The latter were able to increase volume of their program products by adding video and audio elements etc. Later discs were used for digital video (VideoCD).

But technologies are progressing. Data are growing faster and faster. A usual CD is far not enough (640 MBytes). So, there appeared DVD technology. Of course we are happy with those 17 GBytes that can be kept on one DVD disc, but this is a limiting point. So we need a completely new method of storing information on portable data medium. And at last, the company Constellation 3D demonstrates a new format: FMD (Fluorescent Multilayer Disk), which can provide us with a staggering 140 GB of storage space seems to be an enticing solution for the storage-hungry masses.

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Unified Theory of Electrification in Natural Processes

ABSTRACT

Electrification in natural processes is explained by photochemical reactions initiated by electromagnetic (EM) radiation induced in nanoparticles (NPs) by quantum electrodynamics (QED). The NPs ubiquitous to natural processes produce EM radiation depending on the thermal kT of atoms that at ambient temperature is emitted in the far infrared (FIR). However, EM radiation at vacuum ultraviolet (VUV) levels is required to initiate photochemical reactions, and therefore a mechanism is required to increase the frequency from the FIR to VUV levels – the mechanism called QED induced EM radiation. How the NPs form depends on the specific natural process, but all processes are unified by the VUV radiation induced in NPs by QED. For example, static electricity comprising positive and negative charges is produced from VUV induced in NPs that form in the rubbing of dissimilar solids, atmospheric electricity is produced by hydronium and hydroxyl ions from VUV induced in ice NPs as water vapor freezes at high altitudes, and flow electricity is produced by cations and electrons from VUV induced in NPs that form as clusters in turbulence. Prior applications of QED induced EM radiation were based on the EM confinement of FIR radiation in nanovoids (NVs) – bubbles in liquids and gaps in solids. But difficulties with NVs in this regard led to the conclusion that NPs whether liquid or solid are the most likely EM confinement of FIR radiation in natural processes. Compared to NVs, NPs assure EM confinement of FIR radiation to allow frequency up-conversion to VUV levels. Electrification first occurs at the instant the NPs form as the thermal kT energy of the atoms forming the NP is released in a burst of VUV radiation. Steady VUV is then produced as the NP recovers the thermal kT energy lost in the burst from blackbody (BB) radiation in the ambient surroundings. Either way, FIR radiation from the atoms within the NP is suppressed by QED because the FIR frequency is lower than the EM confinement frequency of NPs. To conserve EM energy, QED requires the kT energy loss corresponding to the suppressed IR radiation to be gained at the EM confinement frequency of the NP – typically in the VUV. In this way, the NPs produce the VUV radiation that by photochemical reaction with chemical species to produce charge in natural processes.

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Impedance Glottography

ABSTRACT

Impedance Glottography is noninvasive measurement of the time variation of the degree of contact between the vibrating vocal folds during voice production. The aspect of contact being measured is called the vocal fold contact area (VFCA). To measure VFCA, the device used is called impedance glottograph. The device is also called electroglottograph or laryngograph. The principle of operation of device, the waveform obtained, an algorithm for determination of pitch period is discussed. EGG waveform for various voice qualities, drawbacks in EGG and various noises present are described. Concept of multichannel EGG and applications of electroglottography are discussed.

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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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Creating Based Network Services And Contributions of Social Cloud Operation Support System (OSS) to Society

ABSTRACT

Emerging virtualization technologies are making ubiquitous access to on-demand computing, network and storage resources to deliver various applications over public Internet. In this paper we present how the telecom operation support systems (OSS) that provide Enterprise-to-Enterprise (E2E) transactions, switching management, on-demand service management and scalability have evolved to provide next generation cloud management. Fujitsu’s Social Cloud OSS provides multi-vendor, multi-network management, multi-layer Service Level Agreement (SLA) assurance, on-demand service management and impact analysis to businesses. The Social Cloud OSS service management solution for cloud computing will be the next killer application that will facilitate easy access to cloud services with appropriate SLAs and enable the society to use social networking applications that are currently being delivered using clouds.

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Performance Evaluation of Efficient and Reliable Routing Protocols for Fixed-Power Sensor Networks

ABSTRACT

A Fixed–power wireless sensor networks are cost effective and prevalent, and they are facing lots of problems like RF interference, node failure from environmental noise and energy constraints. A routing protocol for Fixed – power wireless sensor networks must overcome these problems. Because it have to achieve reliability, energy efficiency and scalability in message delivery. In this paper, we propose an efficient and reliable routing protocol (EAR) that achieves reliable and scalable performance with minimal compromise of energy efficiency. The routing design of EAR is based on four parameters – expected path length and a weighted combination of distance traversed, energy levels and link transmission success history, to dynamically determine and maintain the best routes. We will evaluate the performance of efficient and reliable routing protocols for such networks.

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