Bücher von Sumit Bhardwaj

Sem diminuir a utilização de comunicações sem fios e com a correspondente proliferação rápida de investigação em tecnologia móvel, a Mobile Adhoc Network (MANET) tem sido amplamente utilizada para várias aplicações, tais como operações militares de crise e operações de salvamento de emergência. A natureza sem infra-estruturas e as características de topologia dinâmica do MANET tornam estas redes altamente vulneráveis a várias questões de segurança como a exploração de vulnerabilidades de protocolos de encaminhamento e a injecção de pacotes nocivos na rede, etc. Estas ameaças deterioram-se e causam graves danos à rede. O desafio é como prevenir estas ameaças de segurança no MANET. Com base no protocolo AODV, propor um esquema de detecção chamado Esquema de Detecção Cooperativa (CDS), que visa detectar e prevenir os nós afectados lançando ataques de buraco cinzento/ buraco negro colaborativo em MANETs.

Con la costante diminuzione dell'uso delle comunicazioni wireless e la corrispondente rapida proliferazione della ricerca nel campo della tecnologia mobile, le reti mobili ad hoc (MANET) sono state ampiamente utilizzate per varie applicazioni, come le operazioni militari di crisi e le operazioni di soccorso. La natura priva di infrastrutture e le caratteristiche dinamiche della topologia delle MANET rendono queste reti altamente vulnerabili a vari problemi di sicurezza, come lo sfruttamento delle vulnerabilità dei protocolli di routing e l'iniezione di pacchetti dannosi nella rete, ecc. Queste minacce peggiorano e causano gravi danni alla rete. La sfida è come prevenire queste minacce alla sicurezza nelle MANET. Sulla base del protocollo AODV, proponiamo uno schema di rilevamento chiamato Cooperative Detection Scheme (CDS), che mira a rilevare e prevenire i nodi colpiti che lanciano attacchi gray hole/collaborative black hole nelle MANET.

Al no disminuir el uso de las comunicaciones inalámbricas y proliferar a gran velocidad la investigación en tecnología móvil, las redes móviles ad hoc (MANET) se han utilizado ampliamente para diversas aplicaciones, como operaciones militares de crisis y operaciones de rescate de emergencia. La ausencia de infraestructuras y la topología dinámica de MANET hacen que estas redes sean muy vulnerables a diversos problemas de seguridad, como la explotación de vulnerabilidades de los protocolos de enrutamiento y la inyección de paquetes dañinos en la red, entre otros. El deterioro de estas amenazas causa graves daños a la red. El reto es cómo prevenir estas amenazas de seguridad en MANETs. Basándose en el protocolo AODV, se propone un esquema de detección denominado Esquema de Detección Cooperativa (CDS), cuyo objetivo es detectar y prevenir que los nodos afectados lancen ataques de agujero gris/agujero negro colaborativo en MANETs.

Da die Nutzung der drahtlosen Kommunikation nicht nachlässt und sich die Forschung im Bereich der Mobilfunktechnologie entsprechend schnell ausbreitet, werden mobile Ad-hoc-Netze (MANET) in großem Umfang für verschiedene Anwendungen wie militärische Kriseneinsätze und Notfallrettungsaktionen genutzt. Die infrastrukturlose Natur und die dynamischen Topologieeigenschaften von MANET machen diese Netze sehr anfällig für verschiedene Sicherheitsprobleme wie das Ausnutzen von Schwachstellen in Routing-Protokollen und das Einschleusen schädlicher Pakete in das Netz usw. Diese Bedrohungen führen zu schweren Schäden im Netzwerk. Die Herausforderung besteht darin, wie man diese Sicherheitsbedrohungen in MANETs verhindern kann. Auf der Grundlage des AODV-Protokolls wird ein Erkennungsschema namens Cooperative Detection Scheme (CDS) vorgeschlagen, das darauf abzielt, betroffene Knoten zu erkennen und zu verhindern, dass sie graue Löcher/kollaborative schwarze Löcher in MANETs starten.

L'utilisation des communications sans fil ne diminuant pas et la recherche sur les technologies mobiles se développant rapidement, les réseaux mobiles ad hoc (MANET) ont été largement utilisés pour diverses applications telles que les opérations militaires de crise et les opérations de secours d'urgence. La nature sans infrastructure et les caractéristiques de topologie dynamique des MANET rendent ces réseaux très vulnérables à divers problèmes de sécurité comme l'exploitation des vulnérabilités des protocoles de routage et l'injection de paquets nuisibles dans le réseau, etc. Ces menaces détériorées causent de graves dommages au réseau. Le défi est de savoir comment prévenir ces menaces de sécurité dans les MANET. Sur la base du protocole AODV, nous proposons un schéma de détection appelé schéma de détection coopératif (CDS), qui vise à détecter et à empêcher les n¿uds concernés de lancer des attaques de type trou gris/trou noir coopératif dans les MANET.

Due to their excellent magnetic characteristics, hard ferrites have many high-tech applications in such areas as permanent magnets, storage devices, HF Antenna and Spin Transmission. The present book reviews the present knowledge of these materials; their processing, characterization and potential applications. The book is also useful as an introductory text for students at the postgraduate research level.Keywords: Hard Ferrites, Synthesis, BaFe12O19, SrFe12O19, Magnetization, Miniaturization, EMI Shielding, Ferrofluids, Nanomaterials, Nano-Floating Gate, Permanent Magnets, Recording Media, High-Frequency Antenna, Radar Applications, Memory Devices. Spin Transmission, Spinel Model, Synthesis Methods.

With no dwindling in the use of wireless communication and a corresponding speedy proliferation of research in mobile technology, Mobile Adhoc Network (MANET) have been widely used for various applications such as military crisis operations and emergency rescue operations. The infrastructure-less nature and the dynamic topology features of MANET makes these networks highly vulnerable to various security issues like exploiting vulnerabilities of routing protocols and injecting harmful packets in the network etc. These threats deteriorate causes severe damage to the network. The challenge is how to prevent these security threats in MANETs. Based on AODV protocol, propose a detection scheme called the Cooperative Detection Scheme (CDS), which aims at detecting and preventing affected nodes launching gray hole/collaborative black hole attacks in MANETs.

Derail being the second biggest problem in our country, India, thus prepare crash and mischance, is one of the significant concerns. We must Prepare beforehand for the mishappenings due to human errors or mechanical error in trains, in tracks, or in the signal framework. Major and expensive accidents happen because of head-on crash of trains running on a similar track towards each other and if train is on wrong track. More than 85 accidents occurred from 1980 to 2011 in India. In most recent two years more than 27 accidents occurred in India. A few plans have been proposed by analysts in the past to distinguish the danger of conceivable impact and to take preventive measures. This project introduces the advancement of a framework to stay away from accident causes due to Derail caused by obstacles limiting the visibility of the signal, which at pole or obstruction on track and also of train is on wrong track will alert the driver using ultrasonic sensor RFID tag utilizing Radio frequency .i.e. rf module. Track checking instrument utilizes code and controlled by atmega chip and gives the output of the project.