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Aggregate-based congestion control for pulse-wave DDoS defense
(2022)SIGCOMM 2022 - Proceedings of the ACM SIGCOMM 2022 ConferencePulse-wave DDoS attacks are a new type of volumetric attack formed by short, high-rate traffic pulses. Such attacks target the Achilles' heel of state-of-The-Art DDoS defenses: Their reaction time. By continuously adapting their attack vectors, pulse-wave attacks manage to render existing defenses ineffective. In this paper, we leverage programmable switches to build an in-network DDoS defense effective against pulse-wave attacks. To do ...Conference Paper -
FAst in-network GraY failure detection for ISPs
(2022)SIGCOMM 2022 - Proceedings of the ACM SIGCOMM 2022 ConferenceAvoiding packet loss is crucial for ISPs. Unfortunately, malfunctioning hardware at ISPs can cause long-lasting packet drops, also known as gray failures, which are undetectable by existing monitoring tools. In this paper, we describe the design and implementation of FANcY, an ISP-Targeted system that detects and localizes gray failures quickly and accurately. FANcY complements previous monitoring approaches, which are mainly tailored for ...Conference Paper -
Abm: Active buffer management in datacenters
(2022)SIGCOMM 2022 - Proceedings of the ACM SIGCOMM 2022 ConferenceToday's network devices share buffer across queues to avoid drops during transient congestion and absorb bursts. As the buffer-per-bandwidth-unit in datacenter decreases, the need for optimal buffer utilization becomes more pressing. Typical devices use a hierarchical packet admission control scheme: First, a Buffer Management (BM) scheme decides the maximum length per queue at the device level and then an Active Queue Management (AQM) ...Conference Paper -
Impacts of Grid Structure on PLL-Synchronization Stability of Converter-Integrated Power Systems
(2022)IFAC-PapersOnLineSmall-signal instability of grid-connected power converters may arise when the converters use phase-locked loops (PLLs) to synchronize with a weak grid, i.e., operating in grid-following mode. Commonly, this stability problem (referred to as PLL-synchronization stability in this paper) was studied by employing a single-converter system connected to an infinite bus, which, however, omits the impacts of the power grid structure and the ...Conference Paper -
A 3D Printing Platform for Reinforced Printed-Sprayed Concrete Composites
(2022)RILEM Bookseries ~ Third RILEM International Conference on Concrete and Digital FabricationThe issue of reinforcement remains a difficult one for digital fabrication in concrete construction, with many solutions offered on how to best incorporate it with the technology in a practical manner. While certain technologies, such as digital casting systems, allow more seamless introduction of traditional steel reinforcement bars, the dominant technology of extrusion-based 3D printing still shows great limitations, with the most typical ...Conference Paper -
Freeze-Thaw Performance of 3D Printed Concrete: Influence of Interfaces
(2022)RILEM Bookseries ~ Third RILEM International Conference on Concrete and Digital FabricationThe long-term performance of 3D printed concrete structures is essential and among the various durability issues, frost damage is one of key importance, especially in cold locations such as Switzerland. For 3D printed materials, the presence of layer interfaces and cold joints is a potential issue in terms of frost resistance. Therefore, after extrusion, both cast and printed samples were prepared, and they were subjected to 300 cycles ...Conference Paper -
Advanced Skills by Learning Locomotion and Local Navigation End-to-End
(2022)The common approach for local navigation on challenging environments with legged robots requires path planning, path following and locomotion, which usually requires a locomotion control policy that accurately tracks a commanded velocity. However, by breaking down the navigation problem into these sub-tasks, we limit the robot's capabilities since the individual tasks do not consider the full solution space. In this work, we propose to ...Conference Paper -
Real-Time Policy Enforcement with Metric First-Order Temporal Logic
(2022)Lecture Notes in Computer Science ~ Computer Security – ESORICS 2022Correctness and regulatory compliance of today’s software systems are crucial for our safety and security. This can be achieved with policy enforcement: the process of monitoring and possibly modifying system behavior to satisfy a given policy. The enforcer’s capabilities determine which policies are enforceable. We study the enforceability of policies specified in metric first-order temporal logic (MFOTL) with enforcers that can cause ...Conference Paper -
Design of longitudinal tunnel lining joints - experimental investigation on partially loaded reinforced concrete blocks
(2022)Proceedings of the 14th fib International PhD Symposium in Civil EngineeringPrecast concrete segmental linings are frequently used in modern tunnelling. In such linings, the longitudinal segment joints, transferring the circumferential loads, typically have a reduced contact surface compared to the full segment cross-section and hence, often govern the design. Most current design approaches for longitudinal joints consider either the beneficial effect of the load dispersion or that of a transverse confinement ...Conference Paper -
Autonomous Driving - Analysing the Impact of Resilience Engineering Features in Smart Car Interfaces
(2022)MuC '22: Proceedings of Mensch und Computer 2022The communication between driver and vehicle plays an important role in the development of car automation. Being able to perform non-driving related tasks in uncritical situations is one of the biggest advantages of autonomous driving in smart cars. Yet, critical situations often require the driver to take over control again, thereby making the design of takeover maneuvers a highly relevant task. Our study thus investigated the impact of ...Conference Paper -
On Gait Stability: Correlations between Lyapunov Exponent and Stride Time Variability
(2022)Current Directions in Biomedical EngineeringLyapunov exponent is a promising parameter to ascertain the stability of the human gait. In this work, we use a time-series model based on a second-order delay-system with inertial measurement units placed on the foot and wrist. Stability is analyzed in a localized sense, with the Lyapunov exponent computed in the temporal region between two heel-strike points, which are determined using a peak-detection algorithm. We have attempted to ...Conference Paper -
A Dynamical System Approach to Decentralized Collision-free Autonomous Coordination of a Mobile Assistive Furniture Swarm
(2022)In order to facilitate and assist the indoor mobilityof people with special needs, the classically static objects in theenvironment, such as furniture, can be rendered mobile. Theneed for efficient and safe autonomous coordination of a mobilefurniture swarm arises. We present a closed-form approachfor mobile furniture obstacle avoidance and navigation withinan indoor environment. The approach shows that each ...Conference Paper -
Influence of tracking duration on the privacy of individual mobility graphs
(2022)Proceedings of the 17th International Conference on Location-Based ServicesLocation graphs are a compact representation of individual mobility that can be used as a mobility profile to personalize location-based services. While location graphs are more privacy-preserving than raw tracking data, it was shown that there is still a considerable risk for users to be re-identified by their mobility graph topology. However, it is unclear how this risk depends on the tracking duration. Here, we consider a scenario where ...Conference Paper -
To Share or Not to Share: On Location Privacy in IoT Sensor Data
(2022)7TH ACM/IEEE CONFERENCE ON INTERNET-OF-THINGS DESIGN AND IMPLEMENTATION (IOTDI 2022)Data sharing is crucial for building large datasets which in return are essential for developing and training accurate models in many contexts including smart cities, agriculture, and medical applications. However, shared data may leak private information, such as personal identifiers or location. Past research provides evidence that solely removing these identifiers through pseudonymization is not enough to ensure data privacy protection, ...Conference Paper -
DoCile: Taming Denial-of-Capability Attacks in Inter-Domain Communications
(2022)2022 IEEE/ACM 30TH INTERNATIONAL SYMPOSIUM ON QUALITY OF SERVICE (IWQOS)In recent years, much progress has been made in the field of Internet bandwidth reservation systems. While early designs were neither secure nor scalable, newer proposals promise attack resilience and Internet-wide scalability by using cryptographic access tokens (capabilities) that represent permissions to send at a guaranteed rate. Once a capability-based bandwidth reservation is established, the corresponding traffic is protected from ...Conference Paper -
Multi-Criteria Decision Making in Digital Participation: A framework to evaluate participation in urban design processes
(2022)Co-creating the Future: Inclusion in and through DesignData-driven urban design processes consist of iterative actions of many stakeholders, which require digital participatory approaches for collecting data from a high number of participants to make informed decisions. It is important to evaluate such processes to justify the necessary costs and efforts while continuously improving digital participation. Nevertheless, such evaluation remains a challenge due to the involvement of different ...Conference Paper -
Unlocking Urban Simulation Data with a Semantic City Planning System
(2022)Co-creating the Future: Inclusion in and through DesignSimulation models generate an abundance of rich raw data that remains difficult to access for non-experts. However, such data could be unlocked and utilised with a Semantic City Planning System that improves data accessibility and transparency. This paper describes a process of ontologically representing mobility simulation output data using Semantic Web technologies and storing it in a dynamic geospatial knowledge graph. Our work presents ...Conference Paper -
Two Year Exposure of 3D Printed Cementitious Columns in a High Alpine Environment
(2022)RILEM Bookseries ~ Third RILEM International Conference on Concrete and Digital FabricationWhile digital fabrication technologies with concrete have focused primarily on process development and compressive strength in terms of performance, more recently studies evaluating the durability performance of 3D printed cementitious materials have started to appear. To date, however, no field performance assessments have been published regarding 3D printed cementitious materials. In this study, we present the condition of bespoke 3D ...Conference Paper -
The effective width of cross‐laminated timber rib panels in fire
(2022)The composite structure of cross‐laminated timber rib panels consists of cross‐laminated timber (CLT) plates connected to glued‐laminated timber (glulam) ribs. Full composite action is provided by a rigid connection between the composite components by means of screw‐press gluing. For ribbed cross‐sections, the assumption that the cross‐section remains plane is incorrect. The simple beam theory according to Euler‐Bernoulli is not applicable ...Conference Paper -
Robust Control Design for Flexible Guidance of the Aerodynamic Descent of Reusable Launchers
(2023)Rocket reusability is a key-factor for a sustainable and cost-effective future of space missions. Despite successes in this technology, some of the open problems remain an impediment to further development. For example, the descent phase presents important challenges from a guidance and control perspective, because, due to model and environment uncertainty, the optimal re-entry trajectory is often unknown a priori. As a result, the ...Conference Paper