# pocus (blogs) — RSS Amplifier Recent posts from the 1 feeds in the RSS Amplifier directory that cover pocus. Page: Feed: --- ## [Mid-spinal canal depth by weight, mean and 95% centile](https://yingtongli.me/blog/2026/08/02/mscd.html) _2026-08-02 · Inane Observations_ Warning! The intended audience of this article is medical professionals and students. I am not your doctor. This article is not medical advice. This article has not been subject to formal peer review. The following graph shows mean and 95% centile mid-spinal canal depth (MSCD) by weight for children 0.5 kg to 80 kg: The underlying data are sourced from the graphs in: Arthurs OJ, Murray M, Zubier… ## [Reverse engineering 1990s legacy enterprise software licensing](https://yingtongli.me/blog/2026/07/31/drm6.html) _2026-07-31 · Inane Observations_ This article explores a software licensing system used in a proprietary enterprise software package from circa 1994, which is no longer supported by the original developers. The licensing system operated on the basis of short alphanumeric licence keys issued to licensees (e.g. ABCD 012345 67890). The software is distributed as a binary executable (say, foo.exe ) and accompanied by a number of… ## [PDFi: Low-level PDF inspector and editor](https://yingtongli.me/blog/2026/06/08/pdfi.html) _2026-06-08 · Inane Observations_ PDFi is a simple tool for displaying the low-level structure of a PDF file in an interactive tree view. Arbitrary values can be modified or deleted. The motivation for PDFi is to allow modifying a PDF file in a precise, minimally invasive way; for example, to remove a portion of text or a watermark, without affecting the rest of the PDF file. Most naïve approaches to doing this involve converting… ## [Simulation model of ventilation–perfusion mismatch](https://yingtongli.me/blog/2026/02/21/vq-mismatch.html) _2026-02-21 · Inane Observations_ Warning! The intended audience of this article is medical professionals and students. I am not your doctor. This article is not medical advice. This article has not been subject to formal peer review. The model at https://yingtongli.me/blog/assets/posts/2026/vqmodel/ simulates a two-unit lung model where the two units may have different ventilation–perfusion (\\(\\dot{V}/\\dot{Q}\\)) ratios. The… ## [Custom Open in Terminal shortcut for GNOME Files using nautilus-python](https://yingtongli.me/blog/2025/12/26/nautilus-terminal.html) _2025-12-25 · Inane Observations_ When using GNOME Files (Nautilus) with GNOME Console , the keyboard shortcut Ctrl+. can be used to launch a terminal in the currently open folder. Equivalent functionality is not available out of the box for the more fully featured GNOME Terminal – GNOME Terminal adds an ‘Open in Terminal’ option to the context menu, but this does not have a keyboard shortcut. The current standard approach to… ## [GNOME Files (Nautilus) extension for git gui/gitk](https://yingtongli.me/blog/2025/12/23/nautilus-git.html) _2025-12-23 · Inane Observations_ This is a simple extension for GNOME Files (Nautilus), which adds an item to the context menu (when right-clicking in the background in any folder containing a git repository) to directly open git gui or gitk . nautilus-python is a dependency. The script should be placed at ~/.local/share/nautilus-python/extensions/git-menu.py . # Copyright (C) 2025 Lee Yingtong Li # # Licensed under the Apache… ## [pyaccdb: Python library for Microsoft Access .accdb files](https://yingtongli.me/blog/2025/11/22/pyaccdb.html) _2025-11-22 · Inane Observations_ Microsoft Access stores databases in the proprietary .accdb file format. Outside of using the Microsoft Access ODBC driver, which is Windows only, there is limited tooling for accessing Microsoft Access databases from external applications. Notable such tools are mdbtools (C library) and Jackcess (Java library); only Jackcess supports encrypted .accdb files. In the Python sphere, options are… ## [Microsoft Access .accdb encryption and simple Python implementation](https://yingtongli.me/blog/2025/11/20/accdb-encryption.html) _2025-11-20 · Inane Observations_ Current versions of Microsoft Access store databases in the proprietary .accdb file format. Some public descriptions of the .accdb format have been made based on reverse engineering; for example, The Unofficial MDB Guide and mdbtools (despite the names, both also cover .accdb files). Although .accdb encryption has also been reverse engineered (e.g. Jackcess Encrypt ), there does not appear to be a… ## [Ultrasound-guided peripheral IV cannulation in paediatrics](https://yingtongli.me/blog/2025/11/09/usgpiv.html) _2025-11-09 · Inane Observations_ Warning! The intended audience of this article is medical professionals and students. I am not your doctor. This article is not medical advice. This article has not been subject to formal peer review. This post discusses practices and evidence regarding a number of aspects beyond the basics of ultrasound-guided peripheral intravenous cannulation. Most principles are applicable to adults as well,…