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Dynamic enhancement of interleaved step-up/step-down DC-DC converters using passive damping networks
Geetha, E.,Maddah, M.,Mansouri Khosravi, M.,Kokabi, A.,Samavatian, V. The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.3
In this paper, a passive damping network between two stages of a cascaded DC-DC boost/buck interleaved converter was proposed to enhance the dynamic behavior. By this damping network, the right-half plane zeros in converter's transfer function are sufficiently departed from the left half-plane, which leads to more damped transient behavior. A frequency analysis illustrated the dynamic enhancement in the proposed converter. To validate the theoretical model under different related circumstances, experimental results are presented through implementing a prototype setup.
Geetha Mani,Jovitha Jerome 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
In transformer fault diagnosis, dissolved gas analysis (DGA) is been widely employed for a long period and numerous methods have been innovated to interpret its results. Still in some cases it fails to identify the corresponding faults. Due to the limitation of training data and non-linearity, the estimation of key-gas ratio in the transformer oil becomes more complicated. This paper presents Intuitionistic Fuzzy expert System (IFS) to diagnose several faults in a transformer. This revised approach is well suitable to diagnosis the transformer faults and the corresponding action to be taken. The proposed method is applied to an independent data of different power transformers and various case studies of historic trends of transformer units. It has been proved to be a very advantageous tool for transformer diagnosis and upkeep planning. This method has been successfully used to identify the type of fault developing within a transformer even if there is conflict in the results of AI technique applied to DGA data.
Compact and Flexible Monopole Antenna for Ultra-Wideband Applications Deploying Fractal Geometry
Geetha G,Sandeep Kumar Palaniswamy,M. Gulam Nabi Alsath,Malathi Kanagasabai,T. Rama Rao 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.1
This paper presents a compact ultra-wideband (UWB) flexible monopole antenna design on a paper substrate. The proposed antenna is made of iterations of a circular slot inside an octagonal metallic patch. This fractal-based geometry has been deployed to achieve compactness along with improved bandwidth, measured reflection coefficient -10 ㏈ bandwidth ranging from 2.7 to 15.8 ㎓. The overall size of the antenna is 26 ㎜×19 ㎜×0.5 ㎜, which makes it a compact one. The substrate used is paper and the main features like environment friendly, flexibility, green electronics applications and low cost of fabrication are the key factors for the proposed antenna. The aforementioned UWB prototype is suitable for many wireless communication systems such as WiMAX, WiFi, RFID and WSN applications. Antenna has been tested for the effect of bending by placing it over a curved surface of a very small radius of 10 ㎜.
Designing Economic Reforms: The Cases of North Korea and Vietnam
Geetha Govindasamy,박창규,TAN ER WIN 통일연구원 2014 International journal of korean unification studie Vol.23 No.1
Since the death of Kim Jong-il in December 2011, it is apparent that his successor, Kim Jong-un, has embarked on a strategy of ‘Byongjin,’ or parallel development of nuclear weapons whilst simultaneously undertaking economic reform. It is apparent that the new leadership in Pyongyang is seeking an approach to increase agricultural output toease food shortages and improve the peoples’ standards of living, amidst continuing diplomatic isolation. Such circumstances appear set tocontinue, given the continuing poor relations that Seoul and Washingtonhave with Pyongyang, and the deterioration of Sino-North Korean relations. Set against this backdrop, we argue that there is potential forNorth Korea to look south, to the Association of Southeast Asian Nations(ASEAN), in attempting to develop a new model for economic reform. In particular, we note the success of Vietnam’s Doi Moi, in enablingthat country to overcome food shortages, raise living standards, stimulate rapid economic growth, and emerge from diplomatic isolation.
On irreducibility of induced modules and an adaptation of the Wigner--Mackey method of little groups
Geetha Venkataraman 대한수학회 2013 대한수학회지 Vol.50 No.6
This paper deals with sufficiency conditions for irreducibilityof certain induced modules. We also construct irreducible representationsfor a group G over a field K where the group G is a semidirect product ofa normal abelian subgroup N and a subgroup H. The main results areproved with the assumption that char K does not divide |G| but there isno assumption made of K being algebraically closed.
Efficacy of Acupuncture in the Management of Primary Dysmenorrhea: A Randomized Controlled Trial
Geetha B. Shetty,Balakrishna Shetty,A. Mooventhan 사단법인약침학회 2018 Journal of Acupuncture & Meridian Studies Vol.11 No.4
Introduction: Dysmenorrhea constitutes one of the most frequent disorders in women of a fertile age. The present study was conducted to evaluate the efficacy of acupuncture in the management of primary dysmenorrhea. Materials and methods: Sixty females aged 17e23 years were randomly assigned to either a study group or a control group. The study group received acupuncture for the duration of 20 minutes/day, for 15 days/month, for the period of 90 days. The control group did not receive acupuncture for the same period. Baseline, during, and post assessments of both the groups were taken on day 1; day 30 and day 60; and day 90, respectively. Statistical analysis was performed by repeated measures of analysis of variance followed by post hoc analysis with Bonferroni adjustment for multiple comparisons, independent samples t test for visual analog scale score, and ManneWhitney U test for rest of the variables using statistical package for the social sciences, version 16. Results: This study showed a significant reduction in all the variables such as the visual analog scale score for pain, menstrual cramps, headache, dizziness, diarrhea, faint, mood changes, tiredness, nausea, and vomiting in the study group compared with those in the control group. Conclusion: Acupuncture could be considered as an effective treatment modality for the management of primary dysmenorrhea.