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Hyper Hoare Logic: (Dis-)Proving Program Hyperproperties (extended version)
(2023)arXivHoare logics are proof systems that allow one to formally establish properties of computer programs. Traditional Hoare logics prove properties of individual program executions (so-called trace properties, such as functional correctness). Hoare logic has been generalized to prove also properties of multiple executions of a program (so-called hyperproperties, such as determinism or non-interference). These program logics prove the absence ...Working Paper -
CheckMate: Automated Game-Theoretic Security Reasoning
(2023)EasyChair PreprintWe present the CheckMate framework for full automation of game theoretic security analysis, with particular focus on blockchain technologies. CheckMate analyzes protocols modeled as games for their game-theoretic security — that is, for incentive compatibility and Byzantine fault-tolerance. The framework either proves the protocols secure by providing defense strategies or yields all possible attack vectors. For protocols that are not ...Working Paper -
Towards Autonomous Robotic Precision Harvesting: Mapping, Localization, Planning and Control for a Legged Tree Harvester
(2021)This paper presents an integrated system for performing precision harvesting missions using a legged harvester. Our harvester performs a challenging task of autonomous navigation and tree grabbing in a confined, GPS denied forest environment. Strategies for mapping, localization, planning, and control are proposed and integrated into a fully autonomous system. The mission starts with a human mapping the area of interest using a custom-made ...Working Paper -
Commuting distance and individual accessibility
(2018)Arbeitsberichte Verkehrs- und RaumplanungIn the present study a methodology to construct individual-based accessibility measures is introduced. Building on the concept of specifying the distance decay function as a survival function, the transition from a data-driven approach for aggregate distance decay functions, to a model- based approach for individual-based ones is presented. Based on this, the construction of location- and person-specific accessibility measures is facilitated, ...Working Paper -
Within-day replanning of exceptional events
(2011)Arbeitsberichte Verkehrs- und RaumplanungTypical software that is used for the simulation of traffic behavior focuses on scenarios that describe common situations like an ordinary working day without remarkable incidents. To simulate such scenarios, iterative approaches are used. They assume that the simulated people adapt to the results of the previous iterations. Such iterative approaches produce meaningful results for various scenarios as long as only typical, repetitive ...Working Paper -
Modeling household fleet choice as a function of fuel price using a multiple discrete-continuous choice model
(2011)Arbeitsberichte Verkehrs- und RaumplanungIn this Paper, a new model of fleet choice for households is presented that uses the multiple discrete-continuous extreme value (MDCEV) model as a framework. The aim of the model is to establish a model to allocate car types to activity based microscopic agent based transport simulations. What is new in the presented model, is that in addition to socioeconomic attributes of households, the choice is also influenced by fuel price. To model ...Working Paper -
Modelling urban mode choice behavior during the COVID-19 pandemic in Switzerland using MDCEV models
(2021)Arbeitsberichte Verkehrs- und RaumplanungIn this paper we describe and model the behavioral response of the COVID-19 pandemic in Switzerland. We use the MOBIS-COVID GPS-tracking dataset which includes a pre-pandemic reference base. We transform the trip-level data in weekly distance proportions per mode per week, and model the data using a multiple discrete-continuous extreme value (MDCEV) model. We derive four distinct segments from September 2019 until the end of 2020 and use ...Working Paper -
Estimation of carsharing demand using an activity-based microsimulation approach
(2011)Arbeitsberichte Verkehrs- und RaumplanungWorking Paper -
EpiSim Switzerland scenario
(2021)Arbeitsberichte Verkehrs- und RaumplanungIn Switzerland, 702000 people tested positive for the SARS-CoV-2 to date (June 20th, 2021) and 10875 died. Population-wide strategies including testing, tracking, tracing, social distancing, and the use of personal protective equipment are implemented all around the world to mitigate the impacts of the pandemic. Society, economy, and the most vulnerable groups of the population become central when designing the strategies to limit the ...Working Paper -
Global Technology Cycles and Local Economic Performance
(2023)KOF Working PapersThis paper studies the global synchronicity of technology and its impact on the economy. We employ dynamic factor analysis to decompose patent data in different digital technologies for various countries into global and country-speciffc factors. Our findings confirm the existence of global and local technology cycles. We further find a significant positive correlation between the estimated global technology index and a country's economic ...Working Paper