From michele.bianco at epfl.ch Fri Jun 17 09:52:33 2022 From: michele.bianco at epfl.ch (Bianco Michele) Date: Fri, 17 Jun 2022 14:52:33 +0000 Subject: [Soc21cm] Fw: 21cm workshop at UWisc Aug 31 - Sept 2 In-Reply-To: References: Message-ID: <0b86f2159dfd4375b2161b8874c88255@epfl.ch> Dear SOC of the 21cm Cosmology workshop, I am contacting you because I was invited to attend the upcoming 21cm Cosmology Workshop. If possible, I would like to give a talk on some work that focuses on identifying the 21 cm signal in the presence of foregrounds and systematic instrumental noise. * Title: Deep learning approach for identification of HII regions and 21-cm signal recovery from SKA reionisation observations * Abstract: The upcoming Square Kilometre Array (SKA-Low) will map the distribution of neutral hydrogen during reionisation and produce a tremendous amount of 3D tomographic data. These image cubes will be subject to instrumental limitations, such as systematic noise, foreground contamination, radio frequency interference (RFI) and limited resolution. The challenge of this astronomy image is the undesired astronomical and instrumental noise that outshines the 21-cm signal. Therefore, when studying the properties of the 21-cm signal for EoR, considering foregrounds and instrumental imprint on the data is of great importance, as they are orders of magnitude larger than the actual signal and further increase the data cleaning complexity. Here we present SegU-Net, a stable and reliable method for identifying neutral and ionised regions in these images. SegU-Net is a U-Net architecture-based convolutional neural network (CNN) for image segmentation. It can segment our image data into meaningful features (ionised and neutral regions) with greater accuracy than previous methods. We can estimate the true ionisation history from our mock observation of SKA with an observation time of 1000 h with more than 87 per cent accuracy. Our network can be used to recover various topological summary statistics that characterise the non-Gaussian nature of the reionisation process. Moreover, we also show an extended version of SegU-Net that can recover the 21-cm signal from the foreground contaminated tomographic dataset. The updated version of our network employs the segmented maps as position and shape prior to a guided recovery of the simulated 21-cm. We finally derive summary statistics from evaluating the applicability of the expected data from SKA. If possible, I would like to attend the conference in person, but I need to double-check my travel founding. Otherwise, I will be more than happy to participate in the meeting via zoom. I am looking forward to hearing from you. Have a nice day. Best regards, Michele Bianco ___________________________________________________________________________________________________ Dr. Michele Bianco EPFL LASTRO, Lausanne +41 21 693 84 01 | michele.bianco at epfl.ch https://users.sussex.ac.uk/~mb756 ________________________________ From: hirax-all at googlegroups.com on behalf of Laura Newburgh Sent: Friday, 17 June 2022 16:08 To: hirax-all at googlegroups.com Subject: 21cm workshop at UWisc Aug 31 - Sept 2 Hi All -- Please forward this to interested parties and/or consider going yourselves! The SOC (full disclosure, which includes me) are trying to organise it around common challenges, as you'll see below. -------- Dear Colleague: To advance progress in the practice of 21 cm cosmology we are organising a community workshop on 21 cm cosmology instrumentation in Madison Wisconsin on August 31 through September 2, 2022 (Wed-Fri). The workshop focuses on sharing recent progress and challenges from all the major 21 cm interferometry efforts, both EoR and post-EoR, to help this field reach its full potential. We have identified these important common challenges for interferometers affecting both EoR and post-EoR studies * Beam and gain calibration - the practice of calibration from the sky, redundant baselines and their combination - use of drones, holography and EM simulation - pass band structures * Sources of correlated signals (other than sky) - cross talk, feed cross coupling, ground pickup * Advances in mitigation of foregrounds - foreground wedge and its leakage in practice - identifying the 21 cm signal in the presence of foregrounds * Cross-correlations as a tool: - for identifying systematics - for validation * Systematics associated with digital signal processing * Validation - building confidence in the reality of an extracted 21cm signal - use of independent simulations and analysis pipelines - blind analysis * Software tools Of course not all of these topics can be fully covered in a few day workshop but we hope to make progress in some of these areas according to who is in attendance. Expect to have frank discussions of issues encountered and solutions found or under development by practitioners of 21 cm interferometric hydrogen intensity mapping. The morning session will be broadcast over Zoom and consist mainly of scheduled talks. The afternoon sessions will be less structured. A synopsis of the afternoon sessions will be presented during the Friday morning broadcast. In person talks will take precedence over virtual talks as this allows for more follow up discussion. We are sending this open invitation to all groups currently working in this field with the hope that they will identify their members best able to contribute to and benefit from such discussions; and encourage them to attend. Feel free to pass this on to interested parties and to suggest topics which we have missed. Those interested in attending should contact the SoC at soc21cm at lists.physics.wisc.edu along with proposals for formal presentations. Attendance is limited due to space considerations and the number of talks due to time limitations. For full consideration for attendance or a formal presentation please contact us by Weds, July 20 (soc21cm at lists.physics.wisc.edu). The conference website is under development here https://agenda.hep.wisc.edu/event/1784/. Unfortunately, we are unable to assist in funding travel expenses. However, a block of rooms will be reserved at a discounted rate at the University of Wisconsin which operates a number of hotels. There will be a modest registration fee to pay for meals and refreshments. We look forward to a fruitful workshop and to seeing some of you, in person or virtually. The Scientific Organizing Committee Reza Ansari Xuelei Chen Danny Jacobs Miguel Morales Laura Newburgh Albert Stebbins Peter Timbie -- You received this message because you are subscribed to the Google Groups "HIRAX All" group. To unsubscribe from this group and stop receiving emails from it, send an email to hirax-all+unsubscribe at googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/hirax-all/CAAiL7jFgwGZPSPigUO%2BUtZnzjM4BU9KMd%2BQB08wUo6%3DDV9mJkg%40mail.gmail.com. -------------- next part -------------- An HTML attachment was scrubbed... URL: From rbyrne at caltech.edu Thu Jun 30 18:26:19 2022 From: rbyrne at caltech.edu (Ruby Byrne) Date: Thu, 30 Jun 2022 16:26:19 -0700 Subject: [Soc21cm] 21 cm Workshop Abstract Submission Message-ID: I am interested in attending the 21 cm Cosmology workshop in Madison. I am attaching two abstracts for consideration for formal presentations. Thanks, Ruby Byrne -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... 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