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Typical layouts of river widening projects in Switzerland
(2023)Proceedings of the 40th IAHR World CongressDue to anthropogenic activities, many rivers in Switzerland and worldwide are highly degraded. Hence, they are limited in width, channelized, straightened, and the sediment budget is often strongly imbalanced due to sediment mining and damming, leading to sediment retention. Such rivers are characterized by decreased morphological heterogeneity and dynamics and substantial losses in riparian biodiversity. Based on regulations such as the ...Conference Paper -
Rumble: Data Independence for Large Messy Data Sets
(2020)Proceedings of the VLDB EndowmentThis paper introduces Rumble, a query execution engine for large, heterogeneous, and nested collections of JSON objects built on top of Apache Spark. While data sets of this type are more and more wide-spread, most existing tools are built around a tabular data model, creating an impedance mismatch for both the engine and the query interface. In contrast, Rumble uses JSONiq, a standardized language specifically designed for querying JSON ...Conference Paper -
Facial Emotion Recognition with Noisy Multi-task Annotations
(2021)2021 IEEE Winter Conference on Applications of Computer Vision (WACV)Human emotions can be inferred from facial expressions. However, the annotations of facial expressions are often highly noisy in common emotion coding models, including categorical and dimensional ones. To reduce human labelling effort on multi-task labels, we introduce a new problem of facial emotion recognition with noisy multi-task annotations. For this new problem, we suggest a formulation from the point of joint distribution match ...Conference Paper -
Workflows are the New Applications: Challenges in Performance, Portability, and Productivity
(2020)2020 IEEE/ACM International Workshop on Performance, Portability and Productivity in HPC (P3HPC)Great strides have been made to enable performance, portability, and productivity in HPC, but the focus has so far been on standalone applications and on-node programming models. Complex workflows comprising many communicating orchestrators, services, and simulations are redefining what modern HPC applications look like, and it is time to revisit what performance, portability, and performance mean when considered at the workflow level. ...Conference Paper -
Characterization of Subsurface Heat-Transport Processes in the Canton of Aargau Using an Integrative Workflow
(2021)Proceedings World Geothermal Congress 2020+1In a referendum in May 2017, Switzerland decided to phase out nuclear power in favor of further developing renewable energy sources. One of these energy sources is geothermal energy, which, as a base-load technology, fills a niche complementary to solar and wind energy. A known surface-heat-flow anomaly exists in the Canton of Aargau in Northern Switzerland. With measured specific heat-flow values of up to 140 mW m-2, it is an area of ...Conference Paper -
Update of Geothermal Development of Mongolia
(2021)Proceedings World Geothermal Congress 2020+1A first large scale detailed geophysical exploration work in Arkhangai province (a largest geothermal active zone) is done between 2019 and 2020. Based on the result of this geophysical exploration work a combined geothermal district heating and power production plant will be built in Arkhangai province in the coming few years. Ground source heat pump application is broadly introduced in the country using ground water and soil heating system.Conference Paper -
Fast Development of New Alloys for Metal Forming Using Additive Manufacturing
(2021)The Minerals, Metals & Materials Series ~ Forming the FutureThe industrial development of new materials in metal forming is a time consuming, iterative process. Although it is already being attempted to predict the properties of new materials using computational methods, experimental production and characterization must always be carried out. This typically involves casting of larger blocks of material, which are then processed to specimens. Particularly in the case of high-alloyed materials (e.g., ...Conference Paper -
Learning To Disambiguate Strongly Interacting Hands via Probabilistic Per-Pixel Part Segmentation
(2021)2021 International Conference on 3D Vision (3DV)In natural conversation and interaction, our hands often overlap or are in contact with each other. Due to the homogeneous appearance of hands, this makes estimating the 3D pose of interacting hands from images difficult. In this paper we demonstrate that self-similarity, and the resulting ambiguities in assigning pixel observations to the respective hands and their parts, is a major cause of the final 3D pose error. Motivated by this ...Conference Paper -
Telling BERT's Full Story: from Local Attention to Global Aggregation
(2021)Proceedings of the 16th Conference of the European Chapter of the Association for Computational Linguistics: Main VolumeWe take a deep look into the behaviour of self-attention heads in the transformer architecture. In light of recent work discouraging the use of attention distributions for explaining a model’s behaviour, we show that attention distributions can nevertheless provide insights into the local behaviour of attention heads. This way, we propose a distinction between local patterns revealed by attention and global patterns that refer back to the ...Conference Paper -
Distributed lower bounds for ruling sets
(2020)2020 IEEE 61st Annual Symposium on Foundations of Computer Science (FOCS)Given a graph G=(V, E), an ( α, β )-ruling set is a subset S⊆V such that the distance between any two vertices in S is at least α, and the distance between any vertex in V and the closest vertex in S is at most β . We present lower bounds for distributedly computing ruling sets. More precisely, for the problem of computing a ( 2, β)-ruling set (and hence also any ( α, β )-ruling set with α>2 ) in the LOCAL model of distributed computing, ...Conference Paper