2021-06-09

Elliptic curve algebra explained in high school maths

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  I have no formal Computer Science background. Most of my computer knowledge are acquired after graduation. Especially about encryption ...
2020-06-07

從慚愧到一點慰藉

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由於終於安裝了家居寬頻，所以多聽咗youtube（真喺聽，唔喺睇），我用的裝置是一部android手機接駁藍芽音箱。 但越聽越多很花時間 (youtube真喺好addictive!) 跟住有人話其實是用快速1.5至2倍速度聽youtube。坦白講，我對聲效的認識仍停留在n年...
2020-05-17

Zoom來學佛 - 林碧君 (因陀羅網 @ 溫暖人間541期)

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疫情影響了很多宗教活動，佛教也不例外，目前法師講經/開示、 法會、佛學課程、禪修甚至義工們的互動，很多都改以「Zoom」 遙距式舉行。 然而，靠「Zoom」弘法， 對傳訊和接收雙方的要求都大幅地提高了— 我們準備好了嗎？ 不少機構只是把原來的課程／開示設計原封不動地改為網上直播，...

From Uncertainty Principle to the Dilemma of Efficiency and Service Quality

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Recently, listening to some youtube clips about philosophy triggers my memory of Heisenbery's uncertainty principle learnt in high scho...
2017-08-03

Raspberry Pi Camera: Most Simple Motion Detection Logic

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I want to make my newly purchased Pi as a home surveillance appliance. My requirements are very simple: it is purely camera based (i.e...
2017-07-26

Take periodic photos using Pi camera and upload to Google Drive

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Taking photos using the Pi camera is easy.  But how to allow remote access of the photo is a headache.  I do not want to Port Forwarding in...
2016-01-07

Using U3 Flash Drive for CDROM emulation

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I have an old U3 flash drive, which has only 1G capacity. This kind of a device can mount two drives simultaneously - one is a conventiona...
2015-09-24

Using openssl to test two way SSL connectivity

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In my previous post Building a two way https web service server using Java , I said I used openssl to do the web service server testing. I...

Building a two way https web service server using Java

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I have the following requirements: to build a multi-thread http server serving inbound web service requests via POST the request is ...
2015-06-30

Using libxml for XPath

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With the proliferation of presentation of data using XML, I find parsing the data is not easy as more and more ingredients (like attributes...