Design of time delayed chaotic circuit with threshold controller

A novel time delayed chaotic oscillator exhibiting mono- and double scroll complex chaotic attractors is designed. This circuit consists of only a few operational amplifiers and diodes and employs a threshold controller for flexibility. It efficiently implements a piecewise linear function. The control of piecewise linear function facilitates controlling the shape of the attractors. This is demonstrated by constructing the phase portraits of the attractors through numerical simulations and hardware experiments. Based on these studies, we find that this circuit can produce multi-scroll chaotic attractors by just introducing more number of threshold values.Comment: 21 pages, 12 figures; Submitted to IJB

Coronavirus disease 2019 (COVID-19): challenges and management of aerosol-generating procedures in dentistry

Embargo removed due to subject matter

Two-Hop Routing with Traffic-Differentiation for QoS Guarantee in Wireless Sensor Networks

This paper proposes a Traffic-Differentiated Two-Hop Routing protocol for Quality of Service (QoS) in Wireless Sensor Networks (WSNs). It targets WSN applications having different types of data traffic with several priorities. The protocol achieves to increase Packet Reception Ratio (PRR) and reduce end-to-end delay while considering multi-queue priority policy, two-hop neighborhood information, link reliability and power efficiency. The protocol is modular and utilizes effective methods for estimating the link metrics. Numerical results show that the proposed protocol is a feasible solution to addresses QoS service differenti- ation for traffic with different priorities.Comment: 13 page

Long Term use of Cell Phone in Business Community causing Hearing Loss

INTRODUCTION: As civilization has progressed, the noise in man‘s environment has increased. The adverse effect of noise is widespread with respect to human physiology and produce changes in many bio systems other than ear. It is however the ear which concerns us here. Noise has been shown to have many effects on people such as, decrease in working efficiency, annoyance, physiological changes in blood pressure and heart rate and psychological distress. The direct auditory effects are interference with speech communication, produced due to the masking background noise, and the primary auditory effect, the capacity of noise to produce hearing loss. AIM OF THE STUDY: Noise induced hearing loss is a preventable hearing disorder. It affects people of all ages and demographic. When increased intensity is transmitted into and through the auditory system noise induced hearing loss results. MATERIALS AND METHODOLOGY: Cross sectional study. N=90, Age group: 18-50 years. Year of study: 2010-2012. Inclusion criteria: 1. 18 – 50 years of age, 2. Healthy male vegetable traders, 3. Any type of mobile phones, 4. Normal intact tympanic membrane. Exclusion criteria: 1. Any history of any other co morbid illness like hypertension, diabetes mellitus, cardiac illness. 2. Any ear disease which have hearing loss 3. Any surgery to the ear with no improvement of hearing after surgery. 4. Any intake of ototoxic medications. SUMMARY: The cross sectional study was conducted from a period of November 2010 to October 2012, to study the effects of cellphone usage over the human auditory system. Total number of subjects – 90 healthy males. All the subjects were in the age group of 18 to 50 years. 37.78% (34 / 90) of subjects had ear warmth. 34.44% (31 / 90) of subjects had ear fullness. 8.88% (8 / 90) of subjects had tinnitus. Pure tone audiometry done periodically at the interval of one year from the baseline audiogram showing threshold changes in one or two frequencies in the follow up audiogram in 10% of the subjects. These candidates must be followed up regularly, for a long term to derive a final conclusion. CONCLUSION: In this study, on following up of 90 candidates for 3 years with pure tone audiometry, no significant hearing loss was observed, except some threshold changes in one or two frequencies in the final follow up audiogram. It is also observed, that the ear symptoms like ear warmth and ear fullness was observed in approximately 30% of subjects and there was no relation between the ear symptoms and threshold changes. Mild cochlear changes can be revealed in Distortion product otoacoustic emissions and auditory brainstem response. However this is a small cross sectional study, a large sample and long term follow up will be required to derive definite conclusions

Phishing: message appraisal and the exploration of fear and self-confidence

Phishing attacks have threatened the security of both home users and organizations in recent years. Phishing uses social engineering to fraudulently obtain information that is confidential or sensitive. Individuals are targeted to take action by clicking on a link and providing information. This research explores fear arousal and self-confidence in subjects confronted by phishing attacks. The study collected data from multiple sources (including an attempted phishing attack). The survey results indicated that when individuals had a high level of fear arousal related to providing login credentials they had a decreased intention to respond to a phishing attack. Self-confidence did not significantly moderate the relationship between fear arousal and intention to respond to a phishing attack but it did have a significant direct positive influence on intention. The results from the experiment indicated that 18% of individuals overall clicked on the link. The combined data indicated that higher level of fear arousal resulted in a decreased intention to respond to a phishing attack and a decreased actual click behaviour. The research explores how fear of providing login credentials influences both intention to respond and actual response to a phishing attack. When fear arousal is high, individuals are less likely to respond