省電Tip: 功率因子(功率因數)補償

??? 家用電器中比較大型的電感式負載有冷氣機 冰箱 洗衣機 電風扇 抽風機的馬達
電鍋 烤箱 吹風機的加熱線圈;

??? 電容式負載有各式的變壓器 電源供應器 蓄電池 ...???

??? 電感式負載需配合電容來提高功率因數以增加用電效率
??? 電容式負載則需配合電感來提高功率因數



" Linear loads with low power factor (such as induction motors) can be corrected with a passive network of capacitors or inductors."



[ref]
http://en.wikipedia.org/wiki/Power_factor

如何讓電腦自動開機?

[Q] 如何讓電腦自動開機?

[try]
timer + power-on trigger setup in BIOS

BIOS 的 Power Managment Setup
　　Reset On AC Power Loss 設為

• On: 只要有供電，機器就會一直保持在開機狀態
• Off:
• Prev:

手機毛病

• 通話期間莫名奇妙聽不到聲音
• 撥通之後 不到十秒就斷線
• 無法開機
• 電池充不飽

-->

• SIM卡接觸不良
• 電容冷焊
• 電容故障
• 電池壽終

Swf Float16 and Half precison

Swf:
16bit float:

• 1 bit for the sign
• 5 bits for the exponent, with an exponent bias of 16???
• 10 bits for the mantissa.

http://en.wikipedia.org/wiki/Half_precision_floating-point_format

IEEE 754 half precision binary floating-point format: binary16

• 1 bit for the sign
• 5 bits for the exponent, with an exponent bias of 15
• 10 bits for the mantissa. (11 bits of precision --> 1.mantissa)
  

Picasa foto to Gtalk

Picasa foto album sharing

• only for Google Talk Gadget
• not available for desktop Google Talk yet

日租型無線網卡的陷阱?

http://www.mml.com.tw/block/forum/index.php?action=forum_topicdetail&page=forum_topicdetail&t=119590&f=465
" ...
遠傳電信於今日宣布推出更符合消費者需求的日租型「無限飆網250」費率方案，有別於現有市場的日租型無限飆網專案，遠傳全新推出的「無限飆網250」方案，不但讓消費者省下NT$3,500的3.5G網卡費用，同時無限飆網250採以日計費，用多少、算多少，此外，不需要額外再綁語音費率，更不需要一天到晚致電客服中心，麻煩地說明想要上網的天數狀況。
...
"
--> 250 + 69*n = 800 --> n ~~ 8



Mobile01 威寶3G日租型上網讓你用一天付3000!!


http://www.mobile01.com/topicdetail.php?f=18&t=1069833
"
各家也都有一日租，短租型的。 爬文就能看到了。 ... 但設定複雜，各家都有陷阱， 萬一哪個通道沒開，還是走錯

如果真只有半年，你所在的地方，如果威寶能給你穩定3.5G的速度，(即超過384Kbps)，你可以考慮買1.8M的二手網卡。如果威寶只有3G，甚至少於300Kpbs( 40K上下)，Y拍上華為 E612的卡500塊就有了。
...

"

無法開機 無嗶聲 無顯示 鍵盤無反應 NumLock不會亮

[Symptoms]

• 無法開機
• 無嗶聲
• 無顯示
• 鍵盤無反應 NumLock不會亮
• PowerButton 按四秒以上 電源未切斷
• BIOS 沒起來?
  
• 電源正常
• CPU風扇正常
• 機殼風扇正常

[try]

• 關機 拔掉電源線
• 重插顯示卡
• 重插DRAM
• 更換CMOS 電池

//===

[Symptoms]

• Cannot start computer
• No beep
• No display
• No response from keyboard
• No light when pressing NumLock
• Cannot turn off after pressing PowerButton more than 4 seconds
• BIOS seems not started
  
• Power seems OK
• CPU fan runs normally
• Chassis fan runs normally

[try]

• Power off
• Unplug the power cord
• Replug the video card
• Replug DRAM
• Replug CMOS battery

How to disable a certain update in Vista?

[Q] How to disable a certain update in Vista?

[Q] 在Vista的Windows Update中, 如何抑制某些不想安裝的update (例如 IE8), 避免其重複出現?

[Sol] View available updates -> Highlight/Select the target update -> right-click -> Hide update

How to assciate file extension to a specific application?

[Q] How to assciate file extension to a specific application?

[Q] How to achieve that when double-click a file with extension name, say ".pdf",

it can be opened by the program written by ourselves?

[Q] 如何讓某種類型的檔案與應用程式相關聯?

例如用滑鼠雙擊pdf檔案時 能夠用自己寫的程式將其自動開啟?

How to show call stack in Visual Studio?

[Q] How to show "call stack" window in Visual Studio?

[Sol] Debug -> Windows -> call stack

"Immediate Window" : Debug -> Windows -> Immediate

vs_setup.msi can not be opened

[Q] When trying to uninstall VS2005 from "Programs and Features",
message "vs_setup.msi can not be opened" popped out.

[try]

• Copy vs_setup.msi from DVD
• Read http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=778624&SiteID=1
  
• http://social.msdn.microsoft.com/forums/en-US/vssetup/thread/60f71a54-506e-4c70-be98-e993ce6d1ddf/
  
  "
  (1) Rename the Visual Studio directories to something else (e.g. add xxx suffix to the folder name)
  (2) rename the following Register entry using REGEDIT (use with care!)
  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\8.0 (ie. change \8.0 to \8.0xxx)
  (3) Download the Windows Install Clean Up utility at: http://support.microsoft.com/default.aspx/kb/290301
  Use this software to 'clean up' anything with Visual Studio in the name.
  (4) Reinstall the Visual Studio software
  
  "

SPDIF or S/PDIF

S/PDIF: Sony/Philips Digital Interconnect Format

SPDIF : Sony Philips Digital Interconnect Format

Digital audio interfaces:

ref:

http://en.wikipedia.org/wiki/Digital_audio#Digital_audio_interfaces

http://en.wikipedia.org/wiki/S/PDIF

"S/PDIF specifies a Data Link Layer protocol and choice ...
carrying digital audio signals between devices and stereo components over either optical or electrical cable.

The name stands for Sony/Philips Digital Interconnect Format ...

"