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X-WR-CALNAME:EE
X-ORIGINAL-URL:https://ee.iisc.ac.in
X-WR-CALDESC:Events for EE
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TZID:Asia/Kolkata
BEGIN:STANDARD
TZOFFSETFROM:+0530
TZOFFSETTO:+0530
TZNAME:IST
DTSTART:20240101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240404T090000
DTEND;TZID=Asia/Kolkata:20240405T170000
DTSTAMP:20260527T065836
CREATED:20240401T164553Z
LAST-MODIFIED:20240401T165252Z
UID:241422-1712221200-1712336400@ee.iisc.ac.in
SUMMARY:EECS Symposium
DESCRIPTION:The EECS division cordially invites you to the EECS Symposium on 4th & 5th April 2024. \nFor more details please see: https://eecs.iisc.ac.in/EECS2024 \nRegistration link for the event: EECS Symposium 2024 Registration Form.
URL:https://ee.iisc.ac.in/event/eecs-symposium/
LOCATION:IISc
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240410T093000
DTEND;TZID=Asia/Kolkata:20240410T113000
DTSTAMP:20260527T065836
CREATED:20240408T041654Z
LAST-MODIFIED:20240408T042412Z
UID:241429-1712741400-1712748600@ee.iisc.ac.in
SUMMARY:Colloquium On Investigation Of Direct Lightning Strike To High Voltage Transmission Lines
DESCRIPTION:Name of the Candidate :      Mr. Sukesh A \nDegree Registered :               Ph.D. \nTitle of the thesis :                 Investigation Of Direct Lightning Strike To High Voltage Transmission Lines \nTime and date :                     9.30 AM\, 10th April 2024 \nVenue :                                   High Voltage Laboratory Seminar Hall \nResearch supervisor :           Udaya Kumar \nABSTRACT \nLightning continues to be the single largest natural cause of line outages. With high voltage lines spanning millions of kilometres around the globe\, it has been a serious concern to transmission line engineers. Quite unfortunately\, the lightning performance of ultra-high voltage lines falls far below that estimated from the available models. There are two reasons for this difference\, namely\, inadequacy in the present standards in evaluating the lightning attachment process and in ascertaining the surge response of these tall lines. \nThe recent progress in simulating the attachment process is dealt with in the latest CIGRE technical brochure. It is shown that the simplified model proposed over there can account for the observed differences between estimated using older models and the field data. \nDifferent modelling approaches have been employed to evaluate lightning surge response. The most popular approach in power engineering is a lumped current source in parallel with an impedance. However\, there is no consensus among researchers regarding the value of impedance to be used in such models. Based on observations over tall towers\, it has been inferred that the peak value of the lightning current depends on the strike object. Importantly\, a seven years long study based on measurements on heavily instrumented UHV lines in Japan has provided additional information that is not in line with expectations. \nAn alternative modelling approach for evaluating the lightning surge response of lines is to make use of the return stroke models. Among the different categories of return stroke models available\, only the transmission line and electrodynamic models can\, in some sense\, be employed for modelling a direct strike to the transmission line. Even though current is not assumed in the transmission line models\, the mode of propagation is assumed as TEM mode\, which is not true on the channel\, at least in the initial stages of current evolution. Even though the mode of propagation is not assumed in electrodynamic models\, usually\, a lumped excitation is assumed. \nTherefore\, a model that does not assume the excitation and the mode of propagation is essential. A self-consistent return stroke model recently proposed by the group would be an ideal tool for the required investigation. It basically emulates basic essential physical processes along with accurate tracing of dynamic electromagnetic fields using time-domain thin-wire formulation. \nIn order to apply this model to simulate a direct strike scenario to a transmission line\, the field computation methodology had to be extended from the axisymmetric to a fully three-dimensional wire geometry. Further\, wire junctions need to be considered. These were achieved and for the latter\, spatial basic function is borrowed by the Numerical Electromagnetic Code. \nUsing this extended self-consistent return stroke model\, detailed simulations are carried out for a direct strike to the transmission line. The peak current during a strike-to-phase conductor and strike-to-ground (or simplified ground wire-tower structure) are deduced. Using this consistent modelling approach\, it has been clearly shown by modelling that the peak current value for the same conditions reduces to half of that for a strike to ground/ground wire-tower structure. The physical reason for this difference has also been identified. Furthermore\, the mode of propagation of the stroke current along the phase conductor is also assessed.  In summary\, this work has delved into some of the fundamental aspects of lightning strikes.
URL:https://ee.iisc.ac.in/event/colloquium-of-mr-sueksh-9-30-am-10th-april-2024/
LOCATION:HV seminar Hall
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240412T093000
DTEND;TZID=Asia/Kolkata:20240412T110000
DTSTAMP:20260527T065836
CREATED:20240409T063344Z
LAST-MODIFIED:20240409T063642Z
UID:241435-1712914200-1712919600@ee.iisc.ac.in
SUMMARY:Colloquium on  Estimation of flashovers in the EHV/UHV lines on the east  coast due to lightning produced by the Bay of Bengal cyclones
DESCRIPTION:Name of the Candidate:       Anirban Chatterjee \nTitle of the Thesis:              Estimation of flashovers in the EHV/UHV lines on the east coast due to lightning produced by the Bay of Bengal cyclones \nDegree Registered:                MTech (Res) in Electrical Engineering \nTime and date:                     9.30 AM\, 12th April 2024 \nVenue:                                   High Voltage Laboratory Seminar Hall of EE Department \nResearch Supervisor:           Professor Udaya Kumar \nAbstract \nThe Bay of Bengal produces a considerable number of cyclones. Many of them invade the east coast of India. They can cause structural damage to towers\, substation flooding\, conductor snapping\, etc. In many cases\, through lightning\, they cause several flashovers on the EHV/UHV grid. However\, there is no serious effort to estimate the possible number of flashovers caused by the lightning produced by such cyclones. The present work aims to fill this serious gap. \nThe estimation of such lightning-induced flashovers requires several aspects\, both electrical and cyclone-related. The lightning stroke could be intercepted by the tower/ground-wire\, or it can strike the phase conductor. The electro-geometric model(EGM)\, suggested in IEEE standards\, is employed for assessing the normalized number of strokes striking the phase conductor and intercepted by the tower/ground-wire. The associated probabilities are also estimated for typical EHV and UHV lines. \nThe relation between the peak stroke current and the rise time is made based on the literature. Then\, by modelling the lines in EMTP with a multi-story model for the tower\, simulations are carried out to deduce the corresponding voltage rise. Using this information and the BIL of the line\, the possibility of flashovers is assessed. \nThe trajectory of the cyclone and the speed\, along with the number of lightning flashes produced by them are assimilated from different sources. Modelling the cyclone as a disc above ground\, the line length shadowed as a function of time is calculated. In addition\, equivalent ground flash density per square km per hour is also calculated. Combining all these information\, the possible number of lighting-induced flashovers in the EHV/UHV grid along the east coast is estimated.  Within three to four days the number of such flashover incidents can range from a few to few tens of flashovers within a time span of two to four days.
URL:https://ee.iisc.ac.in/event/colloquium-on-estimation-of-flashovers-in-the-ehv-uhv-lines-on-the-east-coast-due-to-lightning-produced-by-the-bay-of-bengal-cyclones/
LOCATION:HV seminar Hall
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240412T160000
DTEND;TZID=Asia/Kolkata:20240412T173000
DTSTAMP:20260527T065836
CREATED:20240412T043837Z
LAST-MODIFIED:20240412T043837Z
UID:241439-1712937600-1712943000@ee.iisc.ac.in
SUMMARY:Talk On Making Machine Learning Models Safer and Better: Data and Model Perspectives
DESCRIPTION:  \nAbstract: As machine learning systems are increasingly deployed in real-world settings like healthcare\, finance\, and scientific applications\, ensuring their safety and reliability is crucial. However\, many state-of-the-art ML models still suffer from issues like poor out-of-distribution generalization\, sensitivity to input corruptions\, requiring large amounts of data\, and inadequate calibration – limiting their robustness and trustworthiness for critical real-world applications. \nIn this talk\, I will present a broad overview of different safety considerations for modern ML systems. I will then proceed to discuss our recent efforts in making ML models safer from two complementary perspectives – (i) manipulating data and (ii) enriching the model capabilities by developing novel training mechanisms. First\, I will discuss our work on designing new data augmentation techniques for object detection followed by demonstrating how\, in the absence of data from desired target domains of interest\, one could leverage pre-trained generative models for efficient synthetic data generation. Next\, I will introduce a new paradigm of training deep networks called model anchoring and show how one could achieve similar properties to an ensemble but through a single model. I will specifically discuss how model anchoring can significantly enrich the class of hypothesis functions being sampled and demonstrate its effectiveness through its improved performance on several safety benchmarks. Finally\, I will present our efforts in proactively identifying samples on which a model would fail through a novel model counterfactual synthesis technique by leveraging foundation models (e.g.\, GPT family and CLIP). I will then conclude by highlighting exciting future research directions for producing robust ML models through leveraging multi-modal foundation models. \n\nBio: Kowshik Thopalli is a Machine Learning Scientist and a post-doctoral researcher at Lawrence Livermore National Laboratory. He is currently mentored by Dr. Jay Thiagarajan. His research focuses on developing reliable machine learning models that are robust under distribution shifts. He has published papers on a variety of techniques to address model robustness\, including domain adaptation\, domain generalization\, and test-time adaptation using geometric and meta-learning approaches. His expertise also encompasses integrating diverse knowledge sources\, such as domain expert guidance and generative models\, to improve model data efficiency\, accuracy\, and resilience to distribution shifts. He received his Ph.D. in 2023 from Arizona State University under the mentorship of Dr. Pavan Turaga.\n______\n\nAll are welcome.
URL:https://ee.iisc.ac.in/event/talk-on-making-machine-learning-models-safer-and-better-data-and-model-perspectives/
LOCATION:B306 \, EE Dept
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240415T150000
DTEND;TZID=Asia/Kolkata:20240415T170000
DTSTAMP:20260527T065836
CREATED:20240412T111144Z
LAST-MODIFIED:20240412T112129Z
UID:241443-1713193200-1713200400@ee.iisc.ac.in
SUMMARY:Colloquium on Development of Pulsed Power Systems and Tooling Coils for Electromagnetic Manufacturing Applications
DESCRIPTION:Title: Development of Pulsed Power Systems and Tooling Coils for Electromagnetic Manufacturing Applications \nSpeaker: DEEPAK KAUSHIK . of Ph.D. (Engg) in Electrical Engineering under Electrical Engineering \nDate/Time: April 15 / 15:00:00 \nLocation: HV Lab Seminar Hall \nResearch Supervisor: Joy Thomas M \nAbstract:\nElectromagnetic pulse manufacturing is an emerging non-conventional manufacturing technique used for the forming of workpieces at very high strain rates. The manufacturing assembly consists of the tooling coil (or actuator)\, the workpiece\, a pulsed power source\, and finally\, a suitable die as per the required final shape that needs to be achieved. In this work\, the author focuses on developing high voltage and high current pulsed power sources as well as the tooling coils required for the electromagnetic forming applications. The study encompasses theoretical simulations and practical experiments pertaining to electromagnetic forming applications involving workpieces made of sheet metal and tubular structures. Electromagnetic forming is a complex multi-physics process that involves electromagnetic\, thermal\, and mechanical fields which are strongly coupled to each other. Initially\, the author focused on understanding the interaction between various physical fields involved and development of fast analytical methods to predict the deformation in the workpiece due to their interaction. Impact velocity and the pressure applied to the workpiece are critical aspects that determine the workpiece’s deformation. Based on the developed coupled models\, the author has proposed techniques to control the impact velocity and the applied pressure on the workpiece and designed the Pulsed Power Systems to achieve the same. The tooling systems are the most vital components in the electromagnetic forming process. This is because they generate the necessary pressure on the workpiece to achieve the final desired shape. The author has designed and developed various tooling coil assemblies for sheet metal forming and operations on tubular workpieces. The author has developed a novel clamp-on type electromagnetic tooling coil for agile manufacturing of tubular components. The designed actuator offers several advantages over conventional helical tooling systems\, including a pressure distribution which does not produce any end effects as opposed to the pressure on the workpiece dropping to 58% of the peak in a conventional helical actuator. It is also marginally less sensitive to standoff distance\, where the reduction in the peak pressure is only 13% as compared to the conventional actuator\, which shows a drastic drop of 56% as the standoff distance varies from 2 mm to 5 mm. The proposed clamp-on tooling coil is also robust to failure as the stress on the proposed actuator is compressive and reinforces it against the toroidal former. In contrast\, the stress on the conventional helical actuator coil is repulsive\, requiring external reinforcements. The proposed actuator is openable and can be reused easily for repeated applications. For sheet metal forming\, the author optimized the uniform pressure actuator and proposed a high-efficiency dual-channel uniform pressure tooling coil (UPTC). The salient features of the designed dual-channel actuator are as follows. The designed tooling coil draws 6.2% more current and applies 24.9% more force than the conventional UPTC for the same pulsed power source parameters. The spatial distribution of the pressure is identical in both the tooling coils\, but the magnitude of the pressure in the proposed dual-channel tooling coil is about 23% higher. In addition\, the proposed tooling coil also has better capabilities for handling electromagnetic stress during the forming process. For the first time\, the author has integrated attractive and repulsive sheet metal forming technology into a single assembly. The author introduces a novel design and analysis of a dual-mode universal uniform pressure tooling coil that integrates both forming techniques\, simplifying the requirements for the pulsed power system. Finally\, the author has studied the effect of tooling coil designs on the efficiency of the forming process. The study aims to find the effect of coil design on the forming efficiency and compares the performance of multi-turn and multi-layer coils over the existing tooling coils. The study has been validated using the development of multi-layered uniform pressure tooling coils with experiments performed on free bulging of AA-6061-T6 sheets. The author found that the multi-layered tooling coils outperformed the single-layered wire-wound coils for all values of the system capacitances used. \nMeeting Link 
URL:https://ee.iisc.ac.in/event/colloquium-on-development-of-pulsed-power-systems-and-tooling-coils-for-electromagnetic-manufacturing-applications/
LOCATION:HV seminar Hall
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240423T093000
DTEND;TZID=Asia/Kolkata:20240423T113000
DTSTAMP:20260527T065836
CREATED:20240412T111613Z
LAST-MODIFIED:20240412T111613Z
UID:241445-1713864600-1713871800@ee.iisc.ac.in
SUMMARY:Colloquium On Plasma activated/assisted solid wastes in diesel exhaust treatment: a case study with agricultural\, industrial and composite wastes
DESCRIPTION:Name of the candidate: Ms. Apoorva Sahu \nResearch Supervisor:     BS Rajanikanth \nDegree Registered:        PhD \nDepartment:                   Electrical Engineering \nTitle of the Thesis:         Plasma activated/assisted solid wastes in diesel exhaust treatment: a case study with agricultural\, industrial and composite wastes \nTime and Date:               9.30 AM\, 23rd April 2024 (tuesday) \nVenue:                            High Voltage building seminar hall \nSynopsis \nThe consumption of crude oil is increasing every day particularly in developing countries like India which is the third largest consumer of crude oil in the world\, utilizing on an average around 160 million litres per annum of which 30% constitutes diesel fuel. More than 50% of the NOx and hydrocarbons in air come from the diesel exhaust affecting the health of human beings\, vegetation\, and environment. While the solid particulate in the exhaust is taken care to a greater extent by the mechanical filters it is the gaseous pollutants such as oxides of nitrogen (NOx)\, oxides of carbon\, hydrocarbons (HC) etc.\, that need to be addressed as they cause several health-related ailments in addition to acid rain\, global warming\, smog etc. It is timely to work on the development of economical and efficient pollution control strategies. On the other hand\, issues that is affecting our country India currently are accumulation of wastes from utility industry\, mariculture industry and agriculture industry. The prominent amongst them are fly ash\, red mud\, foundry sand\, iron ore tailings\, lignite ash\, rice husk\, wheat straw and sugarcane bagasse etc. Accumulation of these wastes are in several million tons per annum in India. Any proposition in recycling waste is a welcoming step. \nEfforts are continuously being made for the past three decades to mitigate these gaseous pollutants\, particularly NOx\, at various levels by changing the fuel composition\, engine modifications\, pre-combustion techniques and post-combustion (aftertreatment) techniques. The existing post-combustion mode technique “catalyst-based converters and adsorbent based techniques” are becoming expensive owing to the short life\, dependency on noble metals\, more vulnerability to acidic coating\, bulk usage of adsorbents etc. In this regard the application of non-thermal plasma or electric discharge plasma for pollution control aided by additional techniques is slowly gaining popularity in the past few years. Discharge plasma ionizes the atoms at normal temperature and atmospheric pressure (NTP) thus creating an oxidative environment resulting in chemical reactions such as reduction\, oxidation\, decomposition etc. However\, among these reactions it was observed that oxidation was dominating\, to a certain extent the oxidised by-products in the plasma appeared to be less hazardous to humans than to nature. This led to the redesigning of plasma reactors with the intention of enhancing the energy in the charged species favouring reduction reactions instead of oxidation ones but not without serious limitations with respect to the gas flow. \nApplication of electrical discharges for environmental purposes lies in the basic concept of treating the pollutants\, particularly the gaseous ones\, with plasma excited species. It is observed that plasma alone is insufficient for the successful treatment of any of the gaseous pollutants due to the oxidative environment prevailing in the discharge plasma at atmospheric conditions. This necessitated inclusion of additional treatment technique along with plasma leading to the origin of plasma catalysis/plasma adsorption methods where in the catalytic materials were kept inside the plasma environment (plasma catalysis) or the adsorbent materials are cascaded with plasma (plasma adsorption). It should be noted here that the total cost involved in the proposed technique\, should be lower than that associated with conventional catalyst-alone or adsorbent-alone techniques so that the proposed ones can be a promising economic alternative to the conventional ones. That said\, cascading commercially available catalysts/adsorbent with plasma can never be a cheaper alternative. Several research works\, therefore\, started by blending plasma with other lab made catalysts/adsorbents but the DeNOx efficiency was not significant. \nPresent work aimed at studying the NOx abatement in diesel engine exhaust at controlled laboratory condition using electrical discharges. The intention of the study is to provide not only an efficient but also an economical solution for reduction of the NOx pollutants. Keeping this in mind\, it was decided to utilize electrical discharge technique in association with abundantly available solid wastes in India be it from industrial\, mariculture or agriculture domains. Given the whole spectrum of parametric variations the thesis plan was carefully drawn to touch upon the following variations: type of corona electrodes\, type of applied high voltage\, type of solid wastes\, type of gas treatment. Four types of electrodes were studied that include needle plate\, metal film\, helical wire and pipe type. Type of voltage involves fast rising repetitive pulses at 80 Hz\, power frequency and high frequency AC. The solid wastes comprise of three categories namely (a) industrial/mariculture wastes that include namely iron tailings\, lignite ash\, red mud\, foundry sand\, waste tiles and copper slag\, oyster shell (b) agricultural wastes including coffee husk\, sugarcane waste\, mulberry husk\, rice husk\, ragi husk\, corn husk\, wheat husk\, pine\, ground nut and areca nut husk and (c) composite wastes which include a blend of waste tiles + foundry sand\, copper slag + red mud\, iron tailings + waste tiles\, red mud + waste tiles\, foundry sand + red mud and foundry sand + iron tailings. The type of gas treatment involves treating the exhaust with only plasma/plasma catalysis/plasma adsorption/thermal catalysis utilizing catalytic properties of metal oxides present in the industry wastes or porous nature of the industry wastes. A comparison was also made by replacing the industrial wastes with commercial NOx catalysts. Important contribution of this research work can be summarized as: (a) with plasma catalysis approach the NOx removal efficiency gets enhanced by a factor of 5.3-6.7 compared to only plasma. (b) with plasma adsorption approach the NOx removal efficiency gets enhanced by a factor of 4-6 compared to only plasma. (c) Fe2O3/TiO2 present in red mud can act as photo catalysts in oxidizing NO through plasma generated ethyl nitrate in the plasma cascaded red mud adsorption process (d) Amongst the agricultural wastes\, ground nut husk-based pellets exhibited 83% NOx removal efficiency (e) The newly developed metal film based DBD reactor enhances surfaces discharges far better than the helical wire reactor (f) commercial catalysts performed much better in NOx removal under plasma catalysis mode when compared to thermal catalysis mode. Further\, plasma catalysis with industrial wastes such as iron tailings and oyster shell yielded better/similar DeNOx efficiency when compared to that with commercial NOx catalysts thus\, justifying the usage of cheaper industrial wastes instead of expensive commercial ones.
URL:https://ee.iisc.ac.in/event/colloquium-on-plasma-activated-assisted-solid-wastes-in-diesel-exhaust-treatment-a-case-study-with-agricultural-industrial-and-composite-wastes/
LOCATION:HV seminar Hall
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240423T103000
DTEND;TZID=Asia/Kolkata:20240423T113000
DTSTAMP:20260527T065836
CREATED:20240422T042104Z
LAST-MODIFIED:20240422T045632Z
UID:241458-1713868200-1713871800@ee.iisc.ac.in
SUMMARY:Defense Talk on Investigating Neural Mechanisms of Word Learning and Speech Perception
DESCRIPTION:Title \nInvestigating Neural Mechanisms of Word Learning and Speech Perception: Insights from Behavioral\, Neural\, and Machine Learning Perspectives \nSpeaker: Ms. Akshara Soman \nTime: 1030am-1130am \nVenue: MMCR\, EE\, C241 and on the Teams-Meeting-Link\n\n\nAbstract \nThe process of language learning and speech perception is a remarkable feat of the human brain\, involving complex neural mechanisms that allow us to understand and communicate with one another. By employing a multidisciplinary approach\, this talk sheds light on the underlying processes involved in word learning and speech perception. \nThe talk begins by examining how imitation of sounds influences language learning and language discrimination using EEG signals. Results show that time-frequency features and phase in the EEG signal contain information for language discrimination. Further experiments confirm these findings and analyse improvements in pronunciation over time\, identifying frontal brain regions involved. \nThe talk then discusses how learning patterns change when semantics are introduced. Participants learn Japanese words and undergo ERP analysis\, revealing distinct EEG patterns for newly learned words. Notably\, a delayed P600 component emerges\, suggesting short-term memory processing.  Based on the above neuro-behavioural experiments\, a machine model is proposed to compare human-machine performances in audio-visual association learning. The model performs comparable to humans in learning with few examples\, with slightly inferior generalisation abilities. \nMoving to naturalistic stimuli\, the talk analyses continuous speech perception using a deep learning model. This model achieves 93% accuracy in stimulus-response modelling on a speech-EEG dataset\, surpassing previous efforts. It demonstrates the role of word-level segmentation during speech comprehension in the human brain.   We further extend this study to investigate speech perception in complex listening environments where multiple speech streams are heard simultaneously. Our proposed model\, based on Long Short-Term Memory (LSTM)\, reveals that the human brain prioritises understanding the semantics rather than the acoustics under such challenging listening conditions. The proposed model has potential applications in speech recognition\, brain-computer interfaces\, and attention studies. \nOverall\, the thesis enhances our understanding of language learning\, speech comprehension\, and the neural mechanisms involved. It provides insights into familiar and unfamiliar language processing\, semantic effects\, audiovisual learning\, and word boundaries in sentence comprehension. These findings have implications for both human language learning and the development of machine systems aimed at understanding and processing speech. \n Coffee/Tea will be served before the talk.
URL:https://ee.iisc.ac.in/event/defense-talk-on-investigating-neural-mechanisms-of-word-learning-and-speech-perception/
LOCATION:Multi-Media Class Room (MMCR)\, EE Department (Hybrid mode)
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