### Lesson learned from Retro-uC and search for ideal HDL for open source silicon

Staf Verhaegen
The Retro-uC was a crowdfunding campaign for an open source silicon project. One of the reasons the campaign did not attract enough people was a lack of enough attractive features. The feature set was kept minimal to allow a first time right chip production. The choice of HDL is important to allow to implement more features with enough productivity and without increasing the risk of having buggy silicon. As will be presented, the venerable VHDL...

### Java and Containers

Ever tried developing Java applications in containers? Of course not. You're a sensible person. From a small footprint to a super-fast spin-up time, the reality of containers is a far cry from the reality of an OpenJDK binary execution. So how do we bring these two disparate visions closer together? Simple! We jlink the required JDK modules to generate a smaller footprint, then leverage alternate JVMs for performant startup! I promise, the reality is simpler...

### Checkpoint Restore

Christine H. Flood
Java has evolved significantly in the past 20+ years. Users still want to run highly scalable monolithic applications, but now they also want to run in the cloud with fast startup and small footprint. Checkpointing will solve at least half of that problem. I'll show you how to checkpoint your java application and then restore it on a different machine, or several different machines. An application that might take minutes to warm up, can be...

### New interoperability, i18n and LibreLogo improvements of LibreOffice

László Németh
by At: FOSDEM 2019 https://video.fosdem.org/2019/UA2.114/new_interoperability_i18n_and_librelogo_improvements_of_libreoffice.webm 3 lightning talks about news and the most important experiences of the various LibreOffice developments made for migration projects in public administration and education, based on my recent presentations of LiboCon, Tirana, and our newer results. Building a LibreOffice development team: We have found and filed more than three hundred bugs during the biggest LibreOffice migration project of Hungary. Our help desk service couldn't handle these efficiently using half measures...

### Grafana Loki: Like Prometheus, but for logs

Tom Wilkie
Imagine if you had Prometheus for log files. We will talk about Tempo, our attempt at creating just that.

### Let's use centralized log collection to make incident response teams happy

Hannah Suarez
The OWASP top 10 most critical web application security risks report published that insufficient logging is one of the top risks security teams face today. In this talk, we will go through issues with incident response teams without centralized logging as well as other reasons to do centralized logging (if you need more!), brief intro about structured data as well as configuration and output examples using NXLog Community Edition. This talk is aimed at administrators...

Alain Joye

Yue Ren

Marc Vinyals

Emanuele Macri

Alexis Coullomb

Lisa Sauermann

Tuomas Hakoniemi

### Hinter den Schatten

Sofia Leikam, Michael Markert, Ansgar Reiners, Sabine Steil, Susanne Schneider, Michael Hillmann & Joachim Feist
Der Dokumentarfilm gibt einen Einblick in das Lehrkonzept des Göttinger Physikers Robert Wichard Pohl (1884-1976). Der Schwerpunkt liegt auf der Verwendung von Pohl-Ideen und -Apparaten in der modernen Grundvorlesung zur Experimentalphysik in Göttingen. Es wird die Arbeit der Dozent:innen und Hörsaaltechniker vorgestellt und von Ihnen in Interviews kommentiert. Der Film entstand im Rahmen des Forschungsprojektes "Projektionen. Die Lehrsammlung Robert Wichard Pohl" (2020-2022, finanziert aus dem Förderprogramm PRO*Niedersachsen)

### How to create an ORKG Comparison - An example from Computer Science

Allard Oelen
ORKG Comparisons present an overview of the state-of-the-art for specific research questions. Learn how to create a comparison with this example in the domain of computer science.

Carlos Brizuela

### Khintchine-type theorems via $L^2$ estimates for Siegel transform

Dmitry Kleinbock
Recently there has been a surge of activity in quantifying the density of values of generic quadratic forms at integer points. I will present some new and quite general results in this direction obtained via the so-called Siegel-Rogers method, which has recently been utilized by Athreya and Margulis, and later by Kelmer and Yu. This work is joint with Mishel Skenderi.

### Roperia tesselata Sylt 2014

Otto Larink
Roperia tesselata (Bacillariophyta, Coscinodiscophyceae, Coscinodiscales, Hemidiscaceae), diameter 75 µm, Sylt 11.2014. 0:20 min. More or less circular cell, coarse areolation, many brownish chloroplasts. Central a specific so-called pseudonodulus, looks like a small hole 3-6 µm in diameter. Video can be used for teaching.

### Modeling environmental impacts on questing activity of Ixodes ricinus nymphs in France

Karine Chalvet-Monfray
Karine Chalvet-Monfray is a professor of Biostatistics and Epidemiology at VetAgro Sup (Lyon). She is a veterinarian with a PhD and post-doc in biomathematics and statistics. Her research mainly focuses on the modelling of weather-sensitive diseases such as vectorial diseases. Since 2014, Karine has been coordinating the tick network observatories in France (ClimaTick) and in 2009 she participated in the design of FleaTickRisk, a forecasting model that uses meteorological data to predict ectoparasite activity in...

### Pleurobrachia pileus 1 Sylt 2016

Otto Larink
Pleurobrachia pileus (Ctenophora, Tentaculifera, Cydippida, Pleurobrachiidae), diameter 450 µm Sylt 09.2016. 0:29 min. Pleurobrachia pileus may be abundant in the North Sea and the early stages as well. Under the microscope the whole body plan is visible. This is a very early larva with extremely short ctenes. Video can be used for teaching.

### Rhizosolenia setigera Sylt 2014

Otto Larink
Rhizosolenia setigera (Bacillariophyta, Coscinodiscophyceae, Rhizosoleniales, Rhizosoleniaceae), length 580 µm, Sylt 11.2014. 1:23 min. Solitary cylindrical and long cells with conical valves, turning into a thin process. Nucleus central near the cell wall, many small chloroplasts. Video can be used for teaching.

### Guinardia striata Sylt 2015

Otto Larink
Guinardia striata (=stolterfothii) (Bacillariophyta, Coscinodicophyceae, Rhizosoleniales, Rhizosoleniaceae), diameter 33 µm, Sylt 10.2015. Cylindrical and slightly curved cells, with flat valves, forming circular to spiralling chains. Valve face with spine and corresponding depression. Numerous chloroplasts. Nucleus central and near the cell wall. Video can be used for teaching.

### Guinardia delicatula Sylt 2015

Otto Larink
Guinardia delicatula (Bacillariophyta, Coscinodicophyceae, Rhizosoleniales, Rhizosoleniaceae), diameter 22 µm, Sylt 10.2015, 0:15 min. Cells cylindrical, with a delicate spine at the valve face and an according depression for the contrary spine, forming straight chains, some irregularly lobed chloroplasts with large pyrenoids. Video can be used for teaching.

### Topology, Geometry, and Dynamics of Laminar groups

Hyungryul Baik
A notion of laminar groups was introduced by D. Calegari. A group acting on the circle by orientation-preserving homeomorphisms is called a laminar group if it admits an invariant lamination. Abundant examples arise naturally in the study of low-dimensional topology and geometric group theory. We will discuss how topology, geometry, and dynamics interplay when we study laminar groups. Some old and new results will be discussed as examples.

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