Research Symposium-2012

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Browsing Research Symposium-2012 by Subject "Biology"

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    CMOS Analog Integrated Circuits for Cochlear Implant System
    (Uva Wellassa University of Sri Lanka, 2012) Duminda Kumara, L. A.; Paasi, Ari; Fdirisinghe, Mahesh
    For centuries, people believed that it's a miracle to restore hearing to the complete disability of hearing (deaf). About forty years ago scientists first attempted to restore normal hearing to the deaf by electrical stimulation of the auditory nerve (Philipos, 1998). With the modern developments, the auditory sensations elicited by electrical stimulation give comfortable hearing for the deaf people. Final product of the latest research called "cochlear implant",which can be implanted in the inner ear and can restore partial hearing to profoundly deaf people.Patients withcochlear implants can now communicate without lip-reading or signing, and some can communicate even over the telephone. This paper describes the design and simulation of a low power signal processor which can be used as analog signal processor of main Cochlear implant system using 0.13 um CMOS technology. The signal processor circuit which is made up of band pass filter, envelop detector and dual slope convertor are based on newly design operational transconductance amplifier (OTA).The propose system has been designed using CMOS technology by means of Cadence CAD tool. The simulations were performed under normal condition using Hspice Simulator and Cscope graphical circuit simulator software for Linux.
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    Design and Development of an Automated Portable Medical Ventilator
    (Uva Wellassa University of Sri Lanka, 2012) Gunathilaka, T.; Herath, H.M.C.N.; Kapuduwa, K.K.S.G.U.; Samitha, M.P.H.K.
    Respiratory diseases and injury induced respiratory failures have become a major public health problem in the world. These diseases are enhanced by air pollution, smoking, and burning of biomass for fuel, all of which are on the rise in developing countries. Patients with these respiratory diseases may undergo breathing difficulties. A medical ventilator is a device which helps in such situations when patients have difficulties to breathe on their own. It comes in many different varieties .These are mainly used in intensive care units in hospitals, in homecare and when transporting patients. Portable ventilators are compact devices designed to provide mechanical ventilation in settings where piped gases and mains electricity are unavailable whereas in ambulances while the patient is transporting. Unfortunately automated portable medical ventilators available today are expensive. When considering a developing country like Sri Lanka, it is difficult to afford such a large amount for a portable ventilator Only a few portable ventilators are available in Sri Lanka hospitals. Lack of portable ventilators has become one of the leading causes of death during the transportation of patients who have breathing difficulties. Therefore the main objective of this project is to develop an automated portable medical ventilator at a low cost with better reliability and acceptable accuracy using available resources.
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    Gastrointestinal Parasitism in Dairy Cattle in Badulla District: Impact of Age, Feeding Pattern and Water Source
    (Uva Wellassa University of Sri Lanka, 2012) Fernando, T. S. R.; Wijesundera, R. R. M. K. K.; Bulumulla, P. B. A. I. K.
    The Gastrointestinal tract of dairy cattle is inhabited by many species of parasites. The prevalence is variable depending upon different intrinsic and extrinsic; epidemiological and biological factors. The economic losses are in the form of mortality, decreased productivity, reduced weight gain and other means affecting the industry globally. Many cattle in Badulla district are underfed during most of the time of the yearand are not supplied with adequate balanced ration. As a result, the general nutritional status of most of the cattle is in subnormal level, which greatly increases susceptibility to parasitic diseases (Blood et al., 1990). This study examines the occurrence of gastrointestinal parasites in dairy cattle in Badulla district and identifies the significance of age, water source and feeding pattern.