A plug-and-play ripple mitigation approach for DC-links in hybrid systems

© 2016 IEEE.In this paper, a plug-and-play ripple mitigation technique is proposed. It requires only the sensing of the DC-link voltage and can operate fully independently to remove the low-frequency voltage ripple. The proposed technique is nonintrusive to the existing hardware and enables hot-swap operation without disrupting the normal functionality of the existing power system. It is user-friendly, modular and suitable for plug-and-play operation. The experimental results demonstrate the effectiveness of the ripple-mitigation capability of the proposed device. The DC-link voltage ripple in a 110 W miniature hybrid system comprising an AC/DC converter and two resistive loads is shown to be significantly reduced from 61 V to only 3.3 V. Moreover, it is shown that with the proposed device, the system reliability has been improved by alleviating the components' thermal stresses

HEALTH SEEKING BEHAVIOR TOWARDS MINOR AILMENTS AMONG UNIVERSITY STUDENTS IN MALAYSIA

Objective: This study was conducted to identify the types of minor ailments encountered by university students in Malaysia and the action taken in response to these ailments. Methods: A cross-sectional study was conducted on undergraduate students from the various faculties in a major private and a public university in Malaysia. A researcher stationed at different areas of the universities to recruit respondents. If the student agreed to participate, he/she would sign a consent form and then self-filled a structured questionnaire. Results: Of the 856 respondents included in this study, 68.6% were female and 60.6% rated their health status as ‘good’ or ‘very good’. During the one month period prior to the study, 87.4% of the respondents encountered at least one minor ailment. The five most common minor ailments encountered were headache (58.1%), common cold (42.8%), sore throat (42.6%), cough (40.3%) and back pain (27.6%). The main actions taken were rest at home and self-medication. The most common drug used for the treatment of minor ailments was paracetamol (49% of the respondents). Other drugs were used by less than 10% of the respondents. The main source of information was from parents (63.7%), followed by doctors (59.9%), internet (57.9%), pharmacists (33.9%) and friends (33.5%). Conclusion: Headache is more common among university students compared to the general population. Further studies are required to understand the cause of headache among this population

Variational Approximation for Complex Regression Models

Ph.DDOCTOR OF PHILOSOPH