Group Key Management Techniques

The most widely used technique in a network is Group communication. This helps in the reduction of the bandwidth usage. The major concern in group communication is its security of messages. Group key provides security of messages and hence proper group key management is very important in a group communication. There are various classifications of group key management techniques. A survey of these key management techniques is done in this paper

Self heating Effects in GaN High Electron Mobility Transistor for Different Passivation Material

In this paper effect of self-heating has been studied of AlGaN/GaN high electron mobility transistor (HEMT) for different passivation layers which is promising device for high power at high frequencies. The different passivation layers used are aluminium oxide (Al2O3), silicon nitride (SiN) and silicon dioxide (SiO2). The device GaN HEMT has been simulated and characterised for its thermal behaviour by the distribution of lattice temperature inside the device using device simulation tool ATLAS from SILVACO. The transfer and output characteristics with and without self-heating has been studied for electrical characterisation. The channel temperature for different passivation observed is 448 K, 456 K and 471 K forAl2O3, SiN and SiO2 respectively. The observed different temperatures are due to difference in their thermal conductivity. This channel temperature information is critical to study the reliability of the device at high power levels

Analytical Modeling of Channel Noise for Gate Material Engineered Surrounded/Cylindrical Gate (SGT/CGT) MOSFET

In this paper, an analytical modeling is presentated to describe the channel noise in GME SGT/CGT MOSFET, based on explicit functions of MOSFETs geometry and biasing conditions for all channel length down to deep submicron and is verified with the experimental data. Results shows the impact of various parameters such as gate bias, drain bias, channel length ,device diameter and gate material work function difference on drain current noise spectral density of the device reflecting its applicability for circuit design applications

Demographic and Clinical Profiles of Parkinson's Disease in India:Observations from a Nation-Wide Multicenter Study

BACKGROUND: Parkinson's disease (PD) phenotype may vary with genetic, ethno-geographic, cultural, and environmental factors.OBJECTIVES: The aim was to develop a clinical database of PD in India and assess the influence of age-at-onset (AAO), gender, and motor subtype on the clinical profile of PD.METHODS: A cross-sectional study of PD was conducted across 18 Indian hospitals. Standardized assessments were performed by movement disorder specialists. Data were collected using uniform questionnaires during the recruitment visit. A total of 3300 age- and gender-matched case-control pairs were analyzed for environmental exposures, habits, and co-morbidities.RESULTS: We recruited 7918 PD cases with a mean AAO of 54.2 ± 11.8 years and a median disease duration of 5 years (interquartile range: 2-9). Subgroup analyses based on AAO, gender, and motor phenotype revealed significant differences in motor and non-motor symptoms, exposures, habits, and co-morbidities. Except coffee consumption, previously known associations were observed for exposure to insecticides/pesticides/fungicides (odds ratio [OR]: 1.67), head injury (OR: 3.11), coffee consumption (OR: 1.73), diabetes (OR: 1.48), hypertension (OR: 1.73), and smoking (OR: 0.74) in the Indian population.CONCLUSIONS: This large pan-Indian study highlights the clinical characteristics, environmental exposures, habits, and comorbid diseases associated with PD, which were broadly similar to those observed in European populations. The earlier AAO in Indian PD patients suggests a potentially higher genetic risk, warranting further investigation. A nationwide, community-based, epidemiological study is needed to achieve a comprehensive understanding of all risk factors for PD in India and to validate the risk factors identified in this hospital-based study. © 2025 The Author(s). Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.</p

The Long-Term Consequences of the Global 1918 Influenza Pandemic: A Systematic Analysis of 117 IPUMS International Census Data Sets

Several country-level studies, including a prominent one for the United States, have identified long-term effects of in-utero exposure to the 1918 influenza pandemic (also known as the Spanish Flu) on economic outcomes in adulthood. In-utero conditions are theoretically linked to adult health and socioeconomic status through the fetal origins or Barker hypothesis. Historical exposure to the Spanish Flu provides a natural experiment to test this hypothesis. Although the Spanish Flu was a global phenomenon, with around 500 million people infected worldwide, there exists no comprehensive global study on its long-term economic effects. We attempt to close this gap by systematically analyzing 117 Census data sets provided by IPUMS International. We do not find consistent global long-term effects of influenza exposure on education, employment and disability outcomes. A series of robustness checks does not alter this conclusion. Our findings indicate that the existing evidence on long-term economic effects of the Spanish Flu is likely a consequence of publication bias

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