Active Noise Control using Variable step-size Griffiths’ LMS (VGLMS) algorithm on Real-Time platform

This paper proposes implementation of Griffith’s Variable step-size algorithm for Active Noise Control (ANC) on ADSP-TS201 EZ-Kit Lite. The dual computational units and execution of up to four instructions per cycle which are special features over other processors are best utilized to generate an optimized code. The VGLMS provides improved secondary path estimation and computations involved are marginal as the same gradient is used for step-size computation and coefficient adaptation. The improved secondary path estimate, in turn improves the ANC performance. Further, variable step-size algorithm is used for the main-path to achieve faster convergence. Both for narrowband (fundamental and its harmonics) and broadband noise fields, for a duct the attenuation achieved is 25 dB and 15 dB respectively. The program execution time was only 1.25% for an input sampling rate of 1 KHz which indicates the utility of the special features of the processor considered. Further these features have enabled in bringing down the program memory requirement in the implementation of the algorithm

Fixation of Mandibular Fractures- A Comparative Study Between 2.0 mm Locking Plates snd Screws and 2.5 mm Conventional Miniplates and Screws

Introduction; Fixation stability and occlusion are of atmost importance in the management of mandibular fractures. Locking plates (2mm) were introduced as internal fixators for achieving stability by locking the screw to the plate. The advantage of using locking plates was decreased amount of inflammatory response and decrease in the infection rate. Our aim was to compare the efficacy of 2mm locking plate and screw with 2.5mm conventional mini plates and screws in the treatment of mandibular fractures in the inter foraminal region and also to evaluate the fixation stability provided by these plates. Methods; 20 patients with mandible fractures were selected who required open reduction and internal fixation under general anesthesia were included in the study. 2mm locking plates and screws were used for fixation of linear fractions in the interforaminal region in 10 patients and 2.5mm mini plates and screws in 10 patients. The various parameters that were compared were fixation stability which included gap alignment after reduction and fixation. Occlusion was checked on the second day and at six weeks post operatively. Patients had a follow up of six weeks and complications if any were recorded Results; In our study it was found that the gap between the fractured fragments after fixation was reduced in the 2mm locking plate and screw system with better fixation stability when compared to mini plate group. Conclusion; So we safely conclude that locking plates and screw showed better results in comparison to miniplate in relation to their fixation stability and complication

Study on Airborne Pollen in the Atmosphere of Bangalore City

The atmospheric pollen of Jnana Bharathi campus, Bangalore University was surveyed during one year period from January 2011 to December 2011 using a vertical cylinder trap. A total of 28 pollen types were identified, among which 7 were present throughout the year. These belonged to Poaceae, Tridax sp., Eucalyptus sp., Parthenium hysterophorus, Cocus nucifera, Croton sparsiflorus and Mimosa pudica. The most predominant Pollen was Parthenium hysterophorus (23.87%) followed by Poaceae (16.19%), Mimosa Pudica (11.31%), Delonix regia (8.77%) and Eucalyptus spp. (7.58%) were found in the atmosphere of Bangalore city. Maximum pollen concentration was observed in the month of May (880/m3) followed by April (552/m3) and minimum in June (163/m3). The total pollens as well as individual pollen types displayed distinct seasonal periodicity in their incidence. The present study will provide preliminary but useful data to the allergologists for effective diagnosis and treatment of local population suffering from pollen hypersensitivity