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Ishwarya, R.
- Spectrum Sensing in Cognitive Radio-An Attempt
Authors
1 SASTRA University, Thanjavur, Tamil Nadu, IN
2 SASTRA University, Thanjavur, IN
3 Pondichery Engineering College, Puducherry, IN
Source
Wireless Communication, Vol 4, No 8 (2012), Pagination: 414-417Abstract
This report demonstrates a non coherent spectrum sensing technique in Cognitive Radio. Cognitive radio is the upcoming technologies which possess immense potential that considers the increasing opportunistic use of licensed frequency spectrum in the near future. It promises efficient spectrum resource utilization, achieved by sensing the unused spectrum bands. Cognitive radio finds the licensed users in the network by sensing the spectrum individually. One of the most challenging issues in Cognitive Radio is spectrum sensing. Various spectrum sensing techniques are described below in each section. The presence or absence of signal is detected by Energy Detection method. In this method, the energy of the signal is sensed and it is compared with the threshold value. The sensing is illustrated using Receiver Operating Characteristic curve (ROC curve) which shows the relationship between sensitivity and specificity. The performance of detection for various SNR of signal is summarized with the probabilities: Probability of Detection and Probability of false alarm. An attempt is made and results are verified with the standard ROC curves.Keywords
Cognitive Radio, Spectrum Sensing, Energy Detection, ROC Curve, Probability of Detection and Probability of False Alarm.- Electricity Generation using Nano Generator
Authors
1 Department of EEE, Ramco Institute of Technology, Rajapalayam, IN
Source
Programmable Device Circuits and Systems, Vol 11, No 2 (2019), Pagination: 26-29Abstract
The usefulness of most high technology devices such as cell phones, computers, and sensors is limited by the storage capacity of batteries. .In the future, these limitations will become more pronounced as the demand for wireless power outpaces battery development which is already nearly optimized. We need to develop electricity generating techniques with the help of wasted human energy which is in the form of mechanical pressure and vibration for our better future .Thus, new power generation techniques are required for the next generation of wearable computers, wireless sensors, and autonomous systems to be feasible. Nano generators are excellent power generation devices because of their ability to couple mechanical and electrical properties. For example, when an electric field is applied to Nano sheets a strain is generated and the material is deformed. Consequently, when a Nano sheets is strained it produces an electric field; therefore, Nano generators can convert ambient vibration into electrical power. Piezoelectric materials have long been used as sensors and actuators; however their use as electrical generators is less established. A piezoelectric power generator has great potential for some remote applications such as in vivo sensors, embedded MEMS devices, and distributed networking. Developing piezoelectric Nano generators is challenging. Piezoelectric properties are controlled/tuned by externally applied force/pressure, such as diode, strain sensor and strain-gated logic unites, which are a new field called piezotronics. Our paper presents a practical analysis to increase the power generation using Nano generators.
Keywords
Nano Generator, Mechanical Stress, Power Generation, Piezotronics.References
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- Management of Oropharyngeal Dysphagia Post Hemi- Mandibuloglossectomy
Authors
1 MERF Institute of Speech and Hearing, Chennai, IN
2 COCPAR, Sree Balaji Dental College & Hospital, Bharath Institute Of Higher Education & Research, IN
3 Department of Oral Pathology, Sree Balaji Dental College & Hospital, Bharath Institute of Higher Education & Research, IN
Source
Indian Journal of Public Health Research & Development, Vol 10, No 12 (2019), Pagination: 2246-2248Abstract
Dysphagia is a growing concern in patients with tongue cancer that leads to malnutrition, dehydration, weight loss, reduced functional abilities, and fear of eating and drinking which can also lead to depression and reduced quality of life. Glossectomy is removal of the entire or parts of the tongue which may lead to difficulty in swallowing, speech, breathing activities etc. Rehabilitating patients with glossectomy pose a great challenge for the clinicians and hence a careful observation and evaluation of residual oral function should be always carried out in such patients. This article throws light on management of swallowing difficulty secondary to hemi-mandibuloglossectomy in a 79 year old male patient with tracheostomy and Ryle’s Naso-Gastric tube with the attempt of restoring the speech and function of the patient through speech and swallowing therapy.Keywords
Dysphagia, Mandibulo Glossectomy, Aspiration.- An Update of Pulpotomy Medicaments in Primary Molars and Shift to Nature
Authors
1 Post Graduate Student, Department of Pedodontics, Sree Balaji Dental College, BIHER, Pallikarani, Chennai, IN
2 Reader, Department of Pedodontics, Sree Balaji Dental College, BIHER, Pallikarani, Chennai, IN
3 Professor and Head of the Department, Sree Balaji Dental College, BIHER, Pallikarani, Chennai, IN
4 Professor, Sree Balaji Dental College, BIHER, Pallikarani, Chennai, IN
5 Reader, Sree Balaji Dental College, BIHER, Pallikarani, Chennai, IN