Author Archive

My Pandemic 2020 Build

April 8th, 2022

Parts List: AMD Ryzen 5 3600X w/Wraith Spire Cooler [$189.99] MSI MPG X570 Gaming Plus ATX [$154.99] MSI Radeon RX5700 XT Gaming X 8GB 256-bit GDDR6 PCI Express 4.0 [$409.99] G.SKILL Ripjaws V DDR4-3200 CL16-18-18-38 1.35V 128GB (4x32GB) 288-pin [$429.98] Samsung 970 EVO Plus NVMe M.2 SSD 2000GB [$249.99] Samsung 970 EVO Plus NVMe M.2 […] – Amazon S3 Glacier Tree Hash

February 20th, 2022

I am planning to implement a bare-bones system to backup pictures, videos, financial records, and software development projects. Among Google, Microsoft, and Amazon, I find that the long term storage services offered by Amazon to be cost effective at $0.0036 per GB per month or $3.60/mo for 1TB. Amazon S3 Glacier also provides a mechanism […]

Happy New Year 2022!

January 15th, 2022

For the new year, I resolve to focus on the following: health: lose 25 pounds in 20 weeks using diet and exercise, and 45 pounds by the end of the year finance: generate returns by periodically establishing high probability of profit options trades career: focus on developing marketable skills, specifically skills in securing software architectures […]

My Start in Options Trading

December 26th, 2021

CNBC’s Yun Li reports, “A record of 39 million options contracts have traded daily on average this year, rising 35% from 2020, according to Options Clearing Corp.” After nearly twenty years of opening a brokerage account and managing a stock portfolio, I completed an options course offered by TD Ameritrade and contributed to this year’s […]

Tobira Kanji and WaniKani

December 5th, 2021
Posted in 日本語 | No Comments

Tobira Gateway to Advanced Japanese Learning through Content and Multimedia assumes 297 kanji are already learned by its potential readers. Tobira presents many words using these kanji without furigana. Learning the statistically most common kanji on- and kun-readings through WaniKani makes Tobira more accessible.

The following table shows what percentage of these prerequisite kanji are covered at particular WaniKani levels:

Level 5: 40%
Level 10: 76%
Level 15: 92%
Level 20: 97%

Only nine prerequisite kanji are introduced by WaniKani after level 20: 職違質授痛貸婚汚遅. The other 277 required kanji are covered in the first 20 levels.

The following snippet, with furigana as provided in Tobira, is extracted from page 5 of the textbook:


Working through level 20 on WaniKani will not give language students the ability to know all vocabulary in the above text. However, they will be able to make good guesses at how to read words such as 都道府県 and use online dictionaries like Jisho. Several words with furigana included by Tobira, such as 他, 大阪, 広島, and 戦争, should be known by WaniKani users at level 20. If Tobira is a gateway to advanced Japanese, then WaniKani is a great tool to develop vocabulary and reading skills needed to pass through that gateway.

The above percentage data was derived from output of a JavaScript program, wktobira.js, which maps Tobira prerequisite kanji to WaniKani levels and is an example of using the WaniKani Web API.