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Auto-FP: An Experimental Study of Automated Feature Preprocessing for Tabular Data
(2023)Advances in Database TechnologyClassical machine learning models, such as linear models and tree-based models, are widely used in industry. These models are sensitive to data distribution, thus feature preprocessing, which transforms features from one distribution to another, is a crucial step to ensure good model quality. Manually constructing a feature preprocessing pipeline is challenging because data scientists need to make difficult decisions about which preprocessors ...Conference Paper -
Performance update of an event-type based analysis for the Cherenkov Telescope Array
(2023)PoS: Proceedings of Science ~ 38th International Cosmic Ray ConferenceThe Cherenkov Telescope Array (CTA) will be the next-generation observatory in the field of very-high-energy (20 GeV to 300 TeV) gamma-ray astroparticle physics. The traditional approach to data analysis in this field is to apply quality cuts, optimized using Monte Carlo simulations, on the data acquired to maximize sensitivity. Subsequent steps of the analysis typically use the surviving events to calculate one set of instrument response ...Conference Paper -
Analyzing Vectorized Hash Tables Across CPU Architectures
(2023)Proceedings of the VLDB EndowmentData processing systems often leverage vector instructions to achieve higher performance. When applying vector instructions, an often overlooked data structure is the hash table, even though it is fundamental in data processing systems for operations such as indexing, aggregating, and joining. In this paper, we characterize and evaluate three fundamental vectorized hashing schemes, vectorized linear probing (VLP), vectorized fingerprinting ...Conference Paper -
Superstabilizing Control of Discrete-Time ARX Models under Error in Variables
(2023)IFAC-PapersOnLine ~ 22nd IFAC World CongressThis paper applies a polynomial optimization-based framework towards the superstabilizing control of an Autoregressive with Exogenous Input (ARX) model given noisy data observations. The recorded input and output values are corrupted with L-infinity-bounded noise where the bounds are known. This is an instance of Error in Variables (EIV) in which true internal state of the ARX system remains unknown. The consistency set of ARX models ...Conference Paper -
Democratic discrepancies in urban sustainable development between residents’ policy preferences and existing policy plans
(2023)Cities are critical for achieving the Sustainable Development Goals (SDGs). As a consequence, cities are increasingly considered policy actors of global relevance. However, there is a wide range of policy issues considered under the umbrella of urban sustainable development (USD) such as biodiversity protection, circular economies, education, transportation, or poverty reduction. Given this wide range of USD, our research seeks to analyze ...Conference Paper -
Work-in-Progress: Effects of Attention Guidance on Virtual Reality Training for an Industrial Assembly Task
(2023)2023 Proceedings of the 9th International Conference of the Immersive Learning Research Network (iLRN 2023) Posters & Doctoral ColloquiumOne of the main objectives of Virtual Training Environments (VTEs) for industrial training is to train workers for a real world task. Prior work identified a multitude of factors influencing a VTE’s effectiveness. In this work-in-progress paper, we add to this body of research by evaluating the effect of attention guidance (AG) on a VTE’s effectiveness. In a controlled between-subject design pilot study with 42 participants, participants ...Conference Paper -
MoTiC: Prototype of a Monolithic Particle Tracking Detector with Timing
(2023)Proceedings of ScienceMoTiC (Monolithic Timing Chip) is a prototype DMAPS Chip that builds on sensor technology developed in the ARCADIA project. The 50 by 50 µm2 pixels contain a small charge collecting electrode with a very low capacitance surrounded by radiation-hard in-pixel electronics. The chip contains a matrix of 5120 pixels on an area of 3.2 by 4 mm2. Each pixel features a trimmable and maskable comparator with a sample and hold circuit for the analog ...Conference Paper -
Progress in Diamond Detector Development
(2023)PoS: Proceedings of Science ~ 10th International Workshop on Semiconductor Pixel Detectors for Particles and ImagingDetectors based on Chemical Vapor Deposition (CVD) diamond have been used successfully in Luminosity and Beam Condition Monitors (BCM) in the highest radiation areas of the LHC. Future experiments at CERN will accumulate an order of magnitude larger fluence. As a result, an enormous effort is underway to identify detector materials that can operate under fluences of 1 · 1016 n cm−2 and 1 · 1017 n cm−2. Diamond is one candidate due to its ...Conference Paper -
Study on TBM jamming hazard in Opalinus clay
(2023)Expanding Underground - Knowledge and Passion to Make a Positive Impact on the WorldThe National Cooperative for the Disposal of Radioactive Waste (Nagra) in Switzerland has designated Opalinus clay as a host rock for a deep geological repository. The drifts for high-level waste storage (∅ 3.5 m) are to be constructed with a shielded tunnel boring machine (TBM) at depths where squeezing conditions may occur and the ground is fully saturated. This paper studies the TBM shield jamming hazard during excavation or long TBM ...Conference Paper -
Search for potential Compressed Air Energy Storage sites in Switzerland
(2023)Expanding Underground - Knowledge and Passion to Make a Positive Impact on the WorldThe energy transition process in Switzerland foresees a move away from nuclear energy. This calls for an expansion of alternative energy sources such as solar or wind. Since these types of energy generation depend on the weather, the energy generated must be stored to be available on demand. In addition to pumped storage plants, compressed air energy storage (CAES) in underground cavities offers a potential solution for this problem. The ...Conference Paper