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Narmadha, R.
- Context-Aware Security using Gimbal based Sensor Control System
Abstract Views :234 |
PDF Views:0
Authors
Affiliations
1 Department of Electronics and Control Engineering, Sathyabama University, Chennai-117, Tamil Nadu, IN
1 Department of Electronics and Control Engineering, Sathyabama University, Chennai-117, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 8, No 5 (2015), Pagination: 432-437Abstract
Objectives: In order to provide efficient knowledge for location aware computing system in mobile applications, this paper proposes an experimental analysis considering user's location information. Methods/Analysis: These systems can entail information from array of sensors. Context aware management system combining central, distributed management scheme along with sensors, which can be utilized for location application. In order to provide better context/location aware management system, sensors (magnetometers) are mounted on Gimbal platform. This sensor platform synchronizes the device direction in all three axes. Findings: Magnetometer sensor can detect ground changes with respect to orientation angle with maximum accuracy. These possessions are validated with magnetic field intensity&rotation headings towards the north direction. Calibration of magnetometer reduces the noise and drift variations in the output. Conclusion :The proposed analysis offers displacement of the device and ensures the quality of service.Keywords
Context Aware, Gimbals, Location Awareness, Magnetometer, Orientation Angle, Sensors.Full Text
- Performance Analysis of Modified EAP-AKA Protocol Based on EAP-TLS for Beyond 3G Wireless Networks
Abstract Views :141 |
PDF Views:3
Authors
R. Narmadha
1,
S. Malarkkan
2
Affiliations
1 Sathyabama University, Chennai, IN
2 Manakula Vinayagar Institute of Technology, Madagadipet, Puducherry, IN
1 Sathyabama University, Chennai, IN
2 Manakula Vinayagar Institute of Technology, Madagadipet, Puducherry, IN
Source
Networking and Communication Engineering, Vol 3, No 1 (2011), Pagination: 1-6Abstract
For future heterogeneous system the security is the one of the most important problem. Interworking of Universal Mobile Telecommunication Systems (UMTS) and wireless local area networks (WLANs) establishes new challenges in the design of secured protocol. Our approach focuses on Public Key Infrastructure (PKI) to be integrated in beyond 3G network. The Extensible Authentication Protocol –Transport layer security (EAP-TLS) protocol is a standard framework supporting multiple types of authentication methods and it provides a certificate based mutual authentication. This paper analyzed the modification of Extensible Authentication Protocol-Authentication key agreement (EAP_AKA) mechanism based on EAP-TLS. In addition the performance of this modified protocol is analyzed with authentication cost under different mobility and traffic pattern.Keywords
UMTS-WLAN, EAP-TLS, EAP-AKA.
- Study and Design Evaluation of RF CMOS Oscillators
Abstract Views :209 |
PDF Views:0
Authors
Affiliations
1 Sathyabama University, Chennai - 600119, Tamil Nadu, IN
1 Sathyabama University, Chennai - 600119, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 42 (2016), Pagination:Abstract
Objectives: To design and analyze the performance of CMOS RF Oscillator circuits at low supply voltage. Methods/Statistical Analysis: The Current Mode Logic (CML) based oscillator and LC oscillator is designed for 5GHz WLAN applications. The CML design adopts a DCO topology and the schematic layout is drawn using Microwind 2.7. The performance analysis is carried out using Intel Core2 Duo CPU E7400 @ 2.80 GHz processor. Advanced Design System 9.0 is used to implement schematics for analyzing the performances of proposed LC tank oscillator. Findings: The simulated results show that the tri-state inverter based DCO has 20 to 30% power reduction which is more than other conventional oscillator circuits. The CML inverter based DCO consumed more power than tri-state inverter because it used tail current transistor that provides always the static path from supply to ground. The theoretical phase noise is compared with simulated value of –95.19 dBc/Hz at same offset frequency. Application/Improvements: These designs produce a substantial improvement in performance and may be easily integrated with RF front-end blocks with minimal interface problems.Keywords
Current Mode Logic, CMOS Technology, Oscillator, Radio Frequency Design.Full Text
- Pathobiological Characteristics of Intestinal and Diffuse-Type of Gastric Carcinoma-Retrospective Study of Gastric Cancers
Abstract Views :239 |
PDF Views:130
Authors
M. Priyadharshini
1,
R. Narmadha
1,
S. Dhanalakshmi
1,
Rajesh Natarajan
1,
S. Subitha
1,
C. Suganthi
1,
Padmavathy
1
Affiliations
1 Institute of Pathology, Madras Medical College, Tamil Nadu, IN
1 Institute of Pathology, Madras Medical College, Tamil Nadu, IN
Source
International Journal of Medical and Dental Sciences, Vol 6, No 2 (2017), Pagination: 1462-1467Abstract
Background: Gastric carcinomas have various pathological features. Based on patterns of growth and invasiveness, however, they fall into two types: diffuse type and intestinal type. These two types of carcinoma appear to be different in their histogenetic origins.
Objectives: To analyse various types of gastric cancer reported in last five years. To compare the features of intestinal and diffuse type gastric carcinoma including gross appearance, staging, grading of tumor.
Materials and Methods: This was a retrospective study of 324 gastric cancer which were surgically resected and received over 5 years. The tumors were divided into groups according to their gross and microscopic patterns. Gross appearance was classified based on Borrmann classification. Microscopic features evaluated include tumor cell type, extent of invasion, degree of maturation, formation of glandular structures, nodal metastasis.
Results: Totally 320 cases of gastric cancer were received of which 218(68%) were male, 102(32%) were female. Gastric cancers are rare below the age of 30 years. Comparing the type of gastric cancer intestinal type were 269(84%), diffuse type were 24(7.5%) and other type of gastric cancer including GIST, lymphoma, mucinous adenocarcinoma were 27(8.5%). Younger patients have higher stage of lymph node metastasis in diffuse type, but not for the intestinal type.
Conclusion: Gastric cancer more common in male (M:F= 2:1) and most frequently seen in 5th decade. Intestinal type constitutes the most common type of gastric tumor. Gross appearance of diffuse type was predominantly infiltrative (79%).
Keywords
Gastric Cancer, Diffuse Type, Intestinal Type, Gross Appearance, Grading, Nodal Metastasis.Full Text
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