arXiv:2604.24771v1 Announce Type: new
Abstract: This study develops a dynamic fundamental diagram (FD) framework tailored to mixed traffic environments comprising automated vehicles (AVs) and human-driven vehicles (HDVs). Describing function analysis is employed to derive approximate linear transfer functions for nonlinear HDV car-following models. A sequence-based stochastic dynamic FD is then formulated for mixed platoons, enabling the evaluation of hysteresis in the evolution of flow-dens...
arXiv:2604.24770v1 Announce Type: new
Abstract: Despite recent progress in automatic speech recognition (ASR), elderly ASR (EASR) remains challenging due to limited training data and the distinct acoustic and linguistic characteristics of elderly speech. In this work, we address data scarcity in EASR through a data augmentation pipeline that combines large language model (LLM)-based transcript paraphrasing with text-to-speech (TTS) synthesis. Given an elderly speech dataset, the LLM first ge...
arXiv:2604.24766v1 Announce Type: new
Abstract: With the rise of time-of-use and tiered electricity pricing, energy consumers are encouraged to adopt peak-shifting strategies by automatically controlling high-power appliances. These help lower energy costs while enhancing the power grid's stability. To support such energy management with high resilience and responsiveness, reliable short-term load forecasting (STLF) plays a critical role. STLF predicts electricity consumption over time horiz...
The archiver only runs when a WAL segment is complete. On a busy database that happens constantly; on a quiet one it might not happen for hours or days. archive_timeout exists to prevent the resulting “our database has been accepting writes all afternoon but none of them are in the archive …
Hello everyone, here comes a series of my annual posts about the Chicago Postgres Conference, and what I am most excited about. And I want to start with the training sessions we offer. All three training sessions are presented by my favorite people, and I can’t wait to tell you more about them!
The first training will be hosted by Andy Atkinson, who not only understands how to make the most of PostgreSQL + Ruby on Rails, but is also passionate about teaching others :). Andy authored a bo...
First in a series of dispassionate surveys of the major managed-Postgres offerings. This post is about Amazon RDS for PostgreSQL — what AWS calls “traditional RDS,” as distinct from Aurora PostgreSQL, which is a separate product with a separate architecture and will get its own post.
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In the previous article we watched every UPDATE leave dead tuple behind. The same copy-on-write behaviour shows up from the operational angle in DELETEs are difficult. That's the tradeoff of MVCC and on the heap alone it's tolerable. The problem is the indexes.
Every UPDATE in PostgreSQL potentially writes to every index on the table, even when the indexed columns didn't change. Five indexes, one updated column? Five extra index writes, five new entries to vacuum, five times the WAL traffic. ...
PostgreSQL 19 ships with parallel autovacuum. The new GUC autovacuum_max_parallel_workers caps the cluster-wide pool, and the per-table storage parameter autovacuum_parallel_workers lets you tune individual tables. Workers come out of the existing max_parallel_workers budget. Off by default. Good…
Stephen O’Grady’s State of Open Source Licensing in 2026 at RedMonk is essential reading. The headline finding — that the long shift from copyleft to permissive licensing has continued, with Apache and MIT consolidating their dominance among the survivors — surprises no one who has be…
At the "What's Next with AWS" 2026 event, AWS launched Amazon Quick—an AI assistant for work with a desktop app and expanded integrations—and expanded Amazon Connect into four agentic AI solutions for supply chain, hiring, customer experience, and healthcare. AWS also extended its partnership with OpenAI, bringing models like GPT-5.5, Codex, and Managed Agents to Amazon Bedrock in limited preview.
How Airbnb built a lightweight workflow engine to solve durable execution.By: Ricardo Gamba, Andriy SergiyenkoIntroduction: The durable execution problemPicture this hypothetical flow: A host submits an insurance claim about their listing to Airbnb. The system needs to validate the claim, run trust and safety checks, assess estimates, process the payout, and send notifications. Halfway through — after the validation passes, but before the payout — the server crashes.What happens�...
The first quarter of 2026 saw a surge in Internet disruptions, from nationwide shutdowns in Uganda and Iran to unprecedented drone strikes on cloud infrastructure. We explore the data behind these events using Cloudflare Radar.
EVs and Transportation
