Towards a Universal Hot Carrier Degradation Model for SiGe HBTs Subjected to Electrical Stress

The objective of this work is to develop a generalizable understanding of the degradation mechanisms present in complementary Silicon-Germanium (SiGe) heterojunction bipolar transistors (HBTs) that can be used to not only predict the reliable lifetime of these devices but also overcome some of these aging limitations using clever device engineering. This broad motivation for understanding and improving SiGe HBT device reliability is explored through the following specific goals: 1) develop an understanding of the dominant hot carrier degradation sources across temperature (25 K – 573 K); 2) develop a broad understanding of all potentially vulnerable regions of damage within a SiGe HBT using electrically measured data, and how these degradations can be captured in a modeling framework; and 3) design optimized SiGe HBTs that can potentially overcome some of these device-level limitations in reliability across temperature. Being able to simulate the electrical degradation of a complex circuit with SiGe HBTs swinging dynamically on the output plane using a universal physics-based aging model is invaluable for any circuit designer optimizing for high performance and reliability.Ph.D

Detection of Denial of Service (DoS) Attacks in VANET using Filters

Vehicular Ad-Hoc Networks (VANET) are considered as a subset of Mobile Ad-Hoc Networks (MANET). VANET is mainly used for the construction of an intelligent transport system. VANET enables communication between the vehicles (V2V) and vehicles to infrastructure (V2I). VANET can be used to coordinate the traffic, improve safety measures, support the drivers for hassle-free driving. It plays a major role in building smart cities in the near future. VANET is vulnerable to a number of security issues among which the DoS attack is a major part. DoS attack in VANET involves a malicious node flooding a huge amount of traffic using spoofed identities. This, in turn, may disrupt the services of vehicles in the network. The detection of the attack becomes very difficult due to fake identities. The detection scheme uses a cuckoo filter and IP detection technique to detect the attack in the network. Once the attack is detected it generates a broadcast message to all the other vehicles that are present in the network

TCAD modeling of mixed-mode degradation in SiGe HBTs

The objective of this work is to develop an effective TCAD based hot-carrier degradation model in predicting the damage that a SiGe HBT undergoes as it is stressed across bias, time and temperature.M.S

Enhanced enantio- and diastereoselectivities via confinement: photorearrangement of 2,4-cyclohexadienones included in zeolites

Employing zeolite as the reaction medium, it is possible to change the enantio (from achiral dienones) and diastereo (from chiral dienones) selectivities during the oxa-di-Π-methane rearrangement of 2,4-cyclohexadienones

Value of zeolites in asymmetric induction during photocyclization of pyridones, cyclohexadienones and naphthalenones

Two strategies, namely chiral inductor and chiral auxiliary approaches, have been examined within zeolites with the aim of achieving asymmetric induction during the photocyclization of cyclohexadienone, naphthalenone and pyridone derivatives. Within zeolites, enantioselectivity as high as 55% and diastereoselectivity as high as 88% have been obtained. The observed stereoselectivities are significant given the fact that these reactions gave very little stereoselectivities in isotropic solution media. The results obtained on the photocyclization of dienones, naphthalenones and N-alkyl pyridones within zeolites compliment our earlier investigations on the photocyclization of tropolone derivatives, the geometric isomerization of 1,2-diphenylcyclopropanes and 2,3-diphenyl-1-benzoyl cyclopropanes, and the Norrish type II reaction of a-oxoamides, phenyl adamantyl ketones, phenyl norbornyl ketones and phenyl cyclohexyl ketones. With the help of these examples, we have established the importance of zeolite and its charge compensating cations in effecting asymmetric induction in photochemical reactions