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https://yingtongli.me/blog
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On Linux, Citrix Workspace (wfica; icaclient 26.04.0.105) crashes, printing the following error message to console: *** WFICA CRASH: SIGFPE (Floating point exception) *** Crash log saved to: /home/username/.ICAClient/logs/wfica_crash_1234567_1234567890.log The crash log contains a printout of CPU registers and backtrace, but we will see this below in a debugger, so we omit this detail here. Using gdb, we can debug the cause of the exception: $ gdb --args /opt/Citrix/ICAClient/wfica…
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 M, Tooley J, Kelsall W. Ultrasonographic determination of neonatal spinal canal depth. Archives of…
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 supporting files. At the outset, we know that foo.exe displays an error message to the effect of ‘Serial…
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 the PDF file into a more editable file format, which introduces complexity and dependencies. For…
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 simulation demonstrates that, in the presence of \(\dot{V}/\dot{Q}\) mismatch, oxygenation is r...
