Händelser: Signaler och system, Elektroteknikhttp://www.chalmers.se/sv/om-chalmers/kalendariumAktuella händelser på Chalmers tekniska högskolaFri, 21 Jan 2022 12:22:42 +0100http://www.chalmers.se/sv/om-chalmers/kalendariumhttps://www.chalmers.se/sv/styrkeomraden/energi/kalendarium/Sidor/Batteriproduktion-i-stor-skala-miljovinster-och-nya-utmaningar.aspxhttps://www.chalmers.se/sv/styrkeomraden/energi/kalendarium/Sidor/Batteriproduktion-i-stor-skala-miljovinster-och-nya-utmaningar.aspxBatteriproduktion i stor skala — miljövinster och nya utmaningar<p>OOTO Café, café, Sven Hultins Plats 2, Johanneberg Science Park 2</p><p>​OBS! På grund av pandemin så håller vi seminariet på nytt datum och tid.  Den 28  januari är vi tillbaka efter julledigheten med säsongens första Fredagsseminarium &amp; afterwork. Välkomna!Plats: Kafé Ooto, Guldhuset, Johanneberg Science Park, kl 12:30-14.00.  Den här gången bjuder vi in till ett seminarium om ett hett ämne: Batteriproduktion i stor skala — miljövinster och nya utmaningar.</p>​<span style="background-color:initial">Utmaningen med batteriproduktion och elektrifieringen är många. Använder fabriken som producerar batterierna förnyelsebar energi eller inte, en annan är tillgången på metaller och vilken roll återvinningen har.</span><div><br /></div> <div>Eftermiddagen startar med ett kort seminarium av Anders Nordelöf, med livscykelanalys som verktyg forskar om miljöaspekterna av elektrifierad vägtrafik för att stötta utvecklingen av fordon med minskad miljöbelastning. <br />Anders Nordelöf är temaledare för forskningsområdet Elektromobilitet i samhället inom Swedish Electromobility Centre, ett nationellt kompetenscentrum för elektromobilitet där Chalmers är värduniversitet. Han har även delat ansvar för Chalmers profilområde Hållbara fordonsteknologier.</div> <div><br /></div> <div><span style="background-color:initial">Så </span><span style="background-color:initial">kom, lyssna, och träffa kollegor, och diskutera nya forskningsidéer och nyheter inom området.</span><br /></div> <div><span style="background-color:initial"><br /></span></div> <div><span style="background-color:initial"><div><b>För att vi ska kunna hålla avstånd och slippa trängas så ser vi gärna att ni anmäler er till seminariet.</b></div> <div><a href="https://ui.ungpd.com/Surveys/1adad28e-3b4f-4521-af83-182bce00c2ea"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/icgen.gif" alt="" />Anmäl dig här​</a></div></span></div> <div><br /></div> <div><b>Program</b></div> <div><ul><li>12:30, Välkommen Tomas Kåberger, Chalmers styrkeområde Energi.</li> <li>Batteriproduktion i stor skala — miljövinster och nya utmaningar, Anders Nordelöf, forksare vid Teknikens ekonomi och organisation, Chalmers.</li> <li>Fr<span style="background-color:initial">ågestund.</span></li> <li>13<span style="background-color:initial">:05-14:00, Mingel.</span></li></ul></div> <div><b><br /></b></div> <div><b>RELATERAT: </b><br /><a href="/sv/styrkeomraden/energi/nyheter/Sidor/EUs-arbete-for-elektrifiering-av-transportsektorn.aspx" style="background-color:rgb(255, 255, 255);outline:0px"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/ichtm.gif" alt="" />​</a><a href="https://www.di.se/hallbart-naringsliv/atervinning-en-not-att-knacka-for-elbilar/">Återvinning — en nöt att knäcka för elbilar</a><br /><a href="/sv/styrkeomraden/energi/nyheter/Sidor/EUs-arbete-for-elektrifiering-av-transportsektorn.aspx"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/ichtm.gif" alt="" />Bidrar till EU:s arbete för elektrifiering av transportsektorn</a><br /></div> <div><a href="https://emobilitycentre.se/energy-management-is-the-main-focus-of-our-research/"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/icgen.gif" alt="" />Swedish Electromobility Centre<br /><span style="font-weight:300"></span></a><span style="background-color:initial"><font color="#1166aa"><a href="/sv/styrkeomraden/transport/profilomraden/Sidor/Hallbara-fordonsteknologier.aspx"><img class="ms-asset-icon ms-rtePosition-4" src="/_layouts/images/ichtm.gif" alt="" />Hållbara fordonsteknologier​</a></font></span><br /></div> ​https://www.chalmers.se/sv/institutioner/e2/kalendarium/Sidor/Mittseminarium-José-Pedro-Lopes-Iglesias.aspxhttps://www.chalmers.se/sv/institutioner/e2/kalendarium/Sidor/Mittseminarium-Jos%C3%A9-Pedro-Lopes-Iglesias.aspxMittseminarium José Pedro Lopes Iglesias<p>online</p><p>​Titel: Factorization Methods for Structure-from-Motion</p><a href="https://chalmers.zoom.us/j/64514698259">​Anslut till seminariet från PC, Mac, Linux, iOS eller Android</a><div><div><br /></div> <div>Maila phdadm.e2@chalmers.se i god tid innan disputationen för att få lösenordet</div> <div><br /></div> <div>The seminar can be accessed through Zoom, and it will open shortly before 10:00. We would kindly ask you to keep the video off and mute the microphone during the seminar. At the end of the session there will be an opportunity to ask questions through Zoom. In case there will be any updates about the event, these will be posted on this website.</div> <div><br /></div> <div><div> José Pedro Lopes Iglesias är doktorand i forskargruppen Datorseende och medicinsk bildanalys</div> <div>Examinator är professor Fredrik Kahl</div></div> <div><br /></div> <div>Sammanfattning</div> <div> Structure-from-Motion (SfM), one of the main problems in Computer Vision, consists of simultaneously estimating camera poses and 3d structure of a scene, given sets of image points from multiple views. Traditional methods for SfM break the problem into multiple sub-problems that are then solved sequentially. This pipeline usually consists of the following steps: finding correspodences between images, estimating pair-wise poses, estimate 3d points, and refine the solution using bundle adjustment. Factorization methods, on the other hand, directly solve the problem given the correspondences between images, avoiding the multistep solution. These methods, however, require adequate optimization strategies in order to avoid local minima and converge to accurate solutions. </div> <div>In this seminar, we show several bilinear factorization methods that can be applied to Rigid and Non-RIgid SfM, under different types of camera models (i.e., affine, perspective, and radial). These consist of the outputs of three research papers. </div> <div><br /></div> <div><br /></div> <div><br /></div></div> <div><br /></div>https://www.chalmers.se/sv/institutioner/e2/kalendarium/Sidor/Ludvig-Andersson.aspxhttps://www.chalmers.se/sv/institutioner/e2/kalendarium/Sidor/Ludvig-Andersson.aspxLudvig Andersson, Elektroteknik<p>Online</p><p>​Titel: Active distribution networks and their impact on the transmission system</p>​​<div><strong>Supervisors: Emil Hillberg, Mattias Persson and Stefan Stankovic (RISE)</strong><br /></div> <strong>Examiner: Peiyuan Chen</strong><br /><strong>Opponents: Viktor Larsson and Tim Haagensen</strong><br /><strong>   </strong><br /><strong>Abstract</strong><br /><div>In order to minimize greenhouse gas emissions, traditional power production is being replaced by renewable power sources in power systems across the world. In order to maximize the use of variable renewable energy sources, new methods of managing demand to match the available generation are subject to research. </div> <div><br /></div> <div>Simultaneously, transmission network stability is projected to worsen over the coming decades partly caused by the decommission of large amounts of synchronous generators. In this thesis, a local distribution network control system is studied to determine how it impacts the transmission network in case of contingencies. The control system is intended to allow for further integration of renewable generation in radial distribution networks, and utilizes active power control to prevent overcurrent and overvoltages in the distribution network. A radial distribution network is modelled and integrated into the IEEE Nordic transmission network model. A previously developed control system is modified to handle a greater range of contingencies, and modified to function with the power system simulation software PSS/E. A number of contingencies in the transmission network are combined with different generation scenarios in the distribution network. Simulations are conducted using a semi-static simulation methodology based on load flow studies. </div> <br />The results imply that the distribution networks under local control can provide indirect mitigation of voltage deviations in the overlying network in case of contingencies. However, this mitigation is dependent on the ability to regulate the active power setpoints of the loads in the distribution network. On load tap changers of the transformers connecting the distribution network to the overlying network improve the voltage stability in the distribution networks, while reducing the amount of voltage support provided to the overlying network. There are a number of assumptions made regarding the technical characteristics of active power control in distribution networks that have a large impact on the results. Further studies into the concept of demand side management are suggested to determine the capabilities of active power regulation.<br /><div><span><br /></span></div> <div><span><strong>Welcome! </strong></span></div> <div><span></span></div> <span><strong>Ludvig, Emil, Mattias, Stefan and Peiyuan </strong></span><br />https://www.chalmers.se/sv/institutioner/e2/kalendarium/Sidor/Johanna-Lundin.aspxhttps://www.chalmers.se/sv/institutioner/e2/kalendarium/Sidor/Johanna-Lundin.aspxJohanna Lundin, Elektroteknik<p>Online</p><p>​Titel: Removal of Myoelectric Signal Disturbances in Prosthetics Control with PCA and ICA - An Experimental Signal Processing Study</p><div>​</div> <div><strong>Examinator: Max Ortiz Catalán</strong></div> <strong>Handledare: Jan Zbinden</strong><br /><strong>Opponent: Julia Molin</strong><br /><br /><div><strong>Abstract</strong></div> <div>The most common technique to control active prostheses is via electromyography (EMG), where myoelectric signals from voluntary muscle contractions are recorded and interpreted as different movements. One longstanding challenge in EMG prosthetic control is crosstalk. Where crosstalk in EMG can be explained as the part of an EMG signal recorded over a muscle but produced by another muscle. The appearance of crosstalk makes decoding of the intended prosthetic movement more difficult and the resulting control less reliable which in turn affects the performance of the prosthesis. </div> <div><br /></div> <div>This project investigates how PCA and ICA affect the EMG signals acquired from implanted electrodes of two participants, one with a trans-humeral and one with a trans-radial amputation. Classification with an MLP showed that the application of PCA over offline featured EMG signals could increase the accuracy for pattern recognition from 87.7% to 99.9%. Meanwhile, the application of ICA increased the accuracy from 87.7% to 93.6%. One modified offline method with PCA which also could be used online was tested and resulted in an increased accuracy from 87.7% to 93.9%. If this improved performance could be achieved online these findings could in the long term improve prosthetics control and yield better life quality for people suffering from limb loss.</div> <br /><div>Välkomna!</div> Johanna Lundinhttps://www.chalmers.se/sv/institutioner/e2/kalendarium/Sidor/Hao-Guo,-Elektroteknik-1.aspxhttps://www.chalmers.se/sv/institutioner/e2/kalendarium/Sidor/Hao-Guo,-Elektroteknik-1.aspxHao Guo, Elektroteknik<p>EB, lecture hall, Hörsalsvägen 11, EDIT trappa C, D och H</p><p>​Titel: Towards Context Information-based High-Performing Connectivity inInternet of Vehicle Communications</p><a href="https://chalmers.zoom.us/j/62942385154">​Anslut till disputationen från PC, Mac, Linux, iOS eller Android via zoom</a><div>Maila phdadm.e2@chalmers.se i god tid innan disputationen för att få lösenordet<br /></div> <div><br /></div> <div><div><span style="background-color:initial">The seminar can be accessed through Zoom, and it will open shortly before 14:00. We would kindly ask you to keep the video off and mute the microphone during the seminar. At the end of the session there will be an opportunity to ask questions through Zoom. In case there will be any updates about the event, these will be posted on this website.</span></div> <div><span style="background-color:initial"><br /></span></div> <div>Hao Guo är doktorand i forskargruppen kommunikationssystem, Avdelningen för kommunikation, antenner och optiska nätverk</div> <div>Opponent är Professor Eduard Jorswieck, TU Braunschweig, Germany</div> <div>Examinator är Professor Tommy Svensson, A<span style="background-color:initial">vdelningen för kommunikation, antenner och optiska nätverk</span></div> <div><span style="background-color:initial"><br /></span></div> <div><span style="background-color:initial">Sammanfattning</span></div> <div><span style="background-color:initial"><div>Internet-of-vehicles (IoV) is one of the most important use cases in the fifth generation (5G) of wireless networks  and beyond. Here, IoV communications refer to two types of scenarios: serving the in-vehicle users with moving relays (MRs); and supporting vehicle-to-everything (V2X) communications for, e.g., connected vehicle functionalities. Both of them can be achieved by transceivers on top of vehicles with growing demand for quality of service (QoS), such as spectrum efficiency, peak data rate,  and coverage probability. However, the performance of MRs and V2X is  limited by challenges such as  the inaccurate prediction/estimation of the channel state information (CSI), beamforming mismatch, and blockages. Knowing the environment and utilizing such context information to assist communication could alleviate these issues. This thesis investigates various context information-based performance enhancement schemes for IoV networks, with main contributions listed as follows.</div> <div><br /></div> <div>In order to mitigate the channel aging issue, i.e., the CSI becomes inaccurate soon at high speeds, the first part of the thesis focuses on one way to increase the prediction horizon of CSI in MRs: predictor antennas (PAs).  A PA system is designed as a system with two sets of antennas on the roof of a vehicle, where the PAs positioned at the front of the vehicle are used to predict the CSI observed by the receive antennas (RAs) that are aligned behind the PAs. In  PA systems, however, the  benefit is affected by a variety of factors. For example, 1) spatial mismatch between the point where the PA estimates the channel and the point where the RA reaches several time slots later, 2) antenna utilization efficiency of the PA,  3) temporal evolution, and 4) estimation error of the PA-base station (BS) channel. </div> <div><br /></div> <div>First, in Paper A, we study the PA system in the presence of the spatial mismatch problem, and propose an analytical channel model which is used for rate adaptation. In paper B, we propose different approximation schemes for the analytical investigation of PA systems, and study the effect of different parameters on the network performance.  Then, involving PAs into data transmission, Paper C and Paper D analyze the outage- and the delay-limited performance of PA systems using hybrid automatic repeat request (HARQ), respectively. As we show in the analytical and the simulation results in Papers C-D, the combination of PA and HARQ protocols makes it possible to improve spectral efficiency  and adapt the transmission parameters to mitigate the effect of spatial mismatch. Finally, a review of PA studies in the literature, the challenges and potentials of PA as well as some to-be-solved issues are presented in Paper E.</div> <div><br /></div> <div>The second part of the thesis focuses on using advanced technologies to further improve the MR/IoV performance. In Paper F, a cooperative PA scheme in IoV networks is proposed to mitigate both the channel aging effect and blockage sensitivity  in millimeter-wave channels by collaborative vehicles and BS handover. Then, in Paper G, we study the potentials and challenges of dynamic blockage pre-avoidance in IoV networks.</div> <div><br /></div> <div>Keywords: 5G/B5G, 6G, blockage, channel state information (CSI), integrated ac- cess and backhaul (IAB), Internet-of-vehicles (IoV), Marcum Q-function, millimeter wave, mobile relay, outage probability, predictor antenna, rate adaptation, reconfig- urable intelligent surface, relay, spatial correlation, temporal correlation, throughput, vehicle-to-everything (V2X), wireless backhaul. </div> <div><br /></div></span></div> <div><br /></div></div>https://www.chalmers.se/sv/styrkeomraden/produktion/kalendarium/Sidor/initiativ-seminar-2022-resilient-production.aspxhttps://www.chalmers.se/sv/styrkeomraden/produktion/kalendarium/Sidor/initiativ-seminar-2022-resilient-production.aspxProduktion – Initiativseminarium 2022<p>RunAn, conference hall, Chalmersplatsen 1, Kårhuset</p><p>​Årets fokus ligger på resilient produktion. Vi återkommer med program längre fram.</p>