Related reading
How do Traffic Signals Work (2019)
A high‑level overview of how traffic signals are designed and operated: basic phases, timing rules, actuated detection, coordination between adjacent lights, and emerging adaptive‑control systems that use centralized data and ML. The piece stays at the level of civil‑engineering concepts and does not dive into implementation details relevant to software engineers.
Hacker News front pagepractical.engineering9 minHN5636Wax motor
Wax motors are linear actuators that turn thermal energy into mechanical motion via wax phase change. They consist of a wax chamber, a plunger, a heat source (electric, solar, combustion, ambient) and a heat sink. Wax expands 5‑20% on melting, delivering forces up to ~4000 N, with a bias spring providing 20‑30% of that force for retraction. Advantages include high force density, smooth actuation,…
Hacker News front pagewikipedia.org4 minHN519106Article: Architecting Secure and Scalable Facial Verification Systems
A real‑world post‑mortem of a high‑volume face verification service that moved from a naïve synchronous API to an async, layered pipeline (edge validation, preprocessing, decoupled detection/verification, decision engine) to achieve 8.5k rpm, p99 < 1.8 s, 30 % cost savings, and strict privacy controls.
InfoQinfoq.com15 minSome things Veloren does differently
Veloren’s engine uses a custom ECS, a novel ‘chonks’ voxel storage, full‑world pre‑generation, physically‑based erosion, and a scalable real‑time simulation (rtsim) that keeps tens of thousands of NPCs active, achieving ~50% CPU usage on a 48‑core server with 500+ players.
MilleMiglia: A realistic instance generator for middle-mile logistics
MilleMiglia is an open‑source C++ generator that creates realistic, privacy‑preserving middle‑mile logistics instances (space‑time graphs with fixed schedules, throughput limits, and synchronization constraints). It uses data‑driven spatial, demand, and rotation distributions, serializes with protobuf, and ships small files for small‑toy to continent‑scale problems, enabling both exact/heuristic…
Google Researchresearch.google7 min

