Yi Wang's Blog

Google Drive Initial Experience

2012-04-27T02:08:00.001-04:00

$ git status
# On branch master
# Changes not staged for commit:
# (use "git add/rm <file>..." to update what will be committed)
# (use "git checkout -- <file>..." to discard changes in working directory)
#
# deleted: Android/MyTracks/20100918/csv/ (1).csv
# deleted: Android/MyTracks/20100918/csv/ (2).csv
# deleted: Android/MyTracks/20100918/csv/ Columbia Cottage .csv
# deleted: Android/MyTracks/20100918/gpx/ (1).gpx
# deleted: Android/MyTracks/20100918/gpx/ (10).gpx
# deleted: Android/MyTracks/20100918/gpx/ (11).gpx
# deleted: Android/MyTracks/20100918/gpx/ (2).gpx
# deleted: Android/MyTracks/20100918/gpx/ (3).gpx
# deleted: Android/MyTracks/20100918/gpx/ (4).gpx
# deleted: Android/MyTracks/20100918/gpx/ (5).gpx
# deleted: Android/MyTracks/20100918/gpx/ (6).gpx
# deleted: Android/MyTracks/20100918/gpx/ (7).gpx
# deleted: Android/MyTracks/20100918/gpx/ (8).gpx
# deleted: Android/MyTracks/20100918/gpx/ (9).gpx
# deleted: Android/MyTracks/20100918/gpx/ Columbia Cottage (1).gpx
# deleted: Android/MyTracks/20100918/gpx/ Columbia Cottage (2).gpx
# deleted: Android/MyTracks/20100918/gpx/ Columbia Cottage (3).gpx
# deleted: Android/MyTracks/20100918/gpx/ Columbia Cottage .gpx
# deleted: Android/MyTracks/20100918/kml/ (1).kml
# deleted: Android/MyTracks/20100918/kml/ (2).kml
# deleted: Android/MyTracks/20100918/kml/ Columbia Cottage .kml
#
# Untracked files:
# (use "git add <file>..." to include in what will be committed)
#
# Android/MyTracks/20100918/csv/(1).csv
# Android/MyTracks/20100918/csv/(2).csv
# Android/MyTracks/20100918/csv/Columbia Cottage .csv
# Android/MyTracks/20100918/gpx/(1).gpx
# Android/MyTracks/20100918/gpx/(10).gpx
# Android/MyTracks/20100918/gpx/(11).gpx
# Android/MyTracks/20100918/gpx/(2).gpx
# Android/MyTracks/20100918/gpx/(3).gpx
# Android/MyTracks/20100918/gpx/(4).gpx
# Android/MyTracks/20100918/gpx/(5).gpx
# Android/MyTracks/20100918/gpx/(6).gpx
# Android/MyTracks/20100918/gpx/(7).gpx
# Android/MyTracks/20100918/gpx/(8).gpx
# Android/MyTracks/20100918/gpx/(9).gpx
# Android/MyTracks/20100918/gpx/Columbia Cottage (1).gpx
# Android/MyTracks/20100918/gpx/Columbia Cottage (2).gpx
# Android/MyTracks/20100918/gpx/Columbia Cottage (3).gpx
# Android/MyTracks/20100918/gpx/Columbia Cottage .gpx
# Android/MyTracks/20100918/kml/(1).kml
# Android/MyTracks/20100918/kml/(2).kml
# Android/MyTracks/20100918/kml/Columbia Cottage .kml

...

1. Seems blanks in file names are automatically removed after synced online.
2. unsyncable files appear after move out and move in a same folder (unknown error for folder?)
3. Upload Error - file point to invalid online Google Doc (older version of docs not supported?)
4. files appear in Mac's trash
5. files appear in root directory of Google Drive

Seems not a very stable backup storage solution yet

An Idea of Management study by using Email Interactions

2012-04-27T01:59:00.000-04:00

Email has To and CC fields.

CC is usually to managers involved.

Could study the Interaction of groups, manager and worker, task time span.

Note

2012-02-22T20:31:00.000-05:00

Hash thread safe
open addressing

parallel callback
fibonacci

process.nextTick()
spawn Child, sorting

复杂性

2011-09-03T19:22:00.003-04:00

复杂的就是复杂的
分离，模块化更像是认识方法
而非能解决问题的完整手段
不能解开耦合

Infinity Blade Spoiler

2011-06-03T00:00:00.000-04:00

First-Person Cooking 第一人称烹饪

2011-01-17T23:36:00.005-05:00

webcam and bike helmet work well together, (only USB wire is enough to fix the camera, no tap needed!)
feeling a bit awkward behind a camera facing forward above head
notable perspective difference between eye and camera
several interconnected USB wires, geometry of kitchen, laptop location

found a paper:
"First-person cooking: a dual-perspective interactive kitchen counter"
http://portal.acm.org/citation.cfm?id=1753992
but they seems were using two fixed location cameras, not really First-Person as in FPS

inspired by
http://www.youtube.com/watch?v=CyCyzB0CedM
http://bit.ly/FutureFPS (twitter bought bit.ly ?)

Scaling foursquare with MongoDB meetup

2010-12-14T21:34:00.006-05:00

http://www.meetup.com/New-York-MongoDB-User-Group/calendar/13817235/

4sq Outrage caused by RAM (64G on EC2) max out (not CPU bounded)
badge calculation based on entire check-in history
Solid state hard drive, significant improvement on matching with RAM
Hadoop for analytics, separate data collection branch on logs
customized MongoDB build with C++ code for location search given prefix
sharding from day 1 with MongoDB, (not using replica set yet)
validating objects in app, correcting if possible
no map reduce on MongoDB yet
original 4sq code is PHP with ... SQL
employee #3

Harry Heymann:
"10% on open source everything"
"XML is wrong"
"if using Java, not with Scala ... , is wrong"

https://docs.google.com/present/view?id=0ATHAG0M-0vxXZGNicHozY2tfMzdjM3hmbXJkYg&hl=en

http://www.10gen.com/video/misc/foursquare

Street Pacman v0.07 on N1 Screen Shot

2010-11-21T23:22:00.003-05:00

157 total
73 active installs (46%)

HP17BII calculator emulator WITHOUT ROM

2010-10-24T20:48:00.001-04:00

Oh, copyright.

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv011.cgi?read=28943

http://www.hpcalc.org/hp48/pc/emulators/

http://hp.giesselink.com/emu42.htm

Qmmp got projectM plugin built in

2010-10-23T21:22:00.001-04:00

Audacious, Amarok do not. (on my machine, Ubuntu 10.04 repo)

Noticed Autocomplete (J key) in Qmmp and Audacious.

http://projectm.sourceforge.net/

Compiling gccgo Needs Bison and Flex

2010-09-29T13:16:00.004-04:00

Following Go installation
http://golang.org/doc/install.html

It took hours to compile gccgo, 8g tooks less time to setup and run.

Bison and Flex reference
http://ubuntuforums.org/archive/index.php/t-339799.html

bootstrap comparison failure ()
http://gcc.gnu.org/ml/gcc/2009-09/msg00220.html

Can not get Gold linker to work (Ubuntu Lucid)

Video
http://www.youtube.com/watch?v=jgVhBThJdXc

Chrome (Chromium) Freezes Ubuntu 10.04 on Lenovo T61, Sync Related Issue

2010-07-02T16:31:00.003-04:00

Now I got this problem (thanks Google)
http://ubuntuforums.org/showthread.php?t=1470623
on both Chrome and Chromium.

The Caps-Lock indicator flashes when it freezes.

Turning off Sync seems work.

NTFS mobile drive dies ...

2010-06-25T22:53:00.012-04:00

After NTFS error message shown on Ubuntu 9.10 when plugin in the mobile drive, I follow its instruction.

Use
chkdsk /f
under windows

It detects lots of file errors and just die, Windows still can not see the drive.

I wonder this command actually does break my files since the implementation to access NTFS file system under Linux might (must) be different from Windows.

Switching back to Ubuntu, all files on the drive seems corrupted (partial images, I/O error)

Evil!

[Update]
Recovered most files after doing nothing but wait for one day, still some files lost.
Strange thing to me is those partial files come back as full files.

Life Saved by Openoffice Backup

2010-06-11T01:51:00.002-04:00

Tried photorec, ddrescue without success, finally saved by ~/.openoffice.org/3/user/backup

Lesson is never leave file residing on external drive opened when the drive goes to unattached.

following Splitting Flex application into modules tutorial

2010-06-06T15:45:00.000-04:00

Code
http://github.com/yiwang/Flex_modules

Tutorial
http://sujitreddyg.wordpress.com/2008/02/05/splitting-flex-application-into-modules/

following GAE python tutorial

2010-05-09T22:29:00.008-04:00

Code

http://github.com/yiwang/GAE_helloworld

Tutorial

http://code.google.com/appengine/docs/python/gettingstarted/helloworld.html
http://www.youtube.com/watch?v=bfgO-LXGpTM

Deployment URL
http://animds090418.appspot.com/

PS:
GAE currently only supports Python2.5.
On Ubuntu 9.10, I have Python2.5 and Python2.6 both installed.
appcfg.py attempts to use SSL to authenticate gmail account.
http://code.google.com/appengine/kb/general.html#rpcssl

In reference to http://groups.google.com/group/google-appengine-python/browse_thread/thread/92583bea0395c57a?pli=1
I can use
sudo easy_install-2.6 pyopenssl
to install and use SSL (import ssl) for Python2.6. But
sudo easy_install-2.5 pyopenssl
seems installation successfully but import ssl fails.

I compiled ssl module from source at http://pypi.python.org/pypi/ssl/ with
sudo apt-get install libbluetooth-dev
to fix the missing bluetooth.h header
and it finally works.

following the great RobotLegs Hello World Video Tutorial

2010-05-07T21:15:00.004-04:00

Tutorial at:
http://pv3d.org/2009/11/18/robotlegs-hello-world-video-tutorial

code:
http://github.com/yiwang/HelloRobotLegs/

made a build.xml for ant to compile .as files directly into .swf with open sourced Flex SDK, without Flash (Flex) Builder or Flash IDE.

Create an eCommerce Website with Spree in under 1 minute

2010-04-11T16:59:00.001-04:00

Spree! (got its sample site running on my server)
http://spreecommerce.com/support/quick_start

Code:
http://github.com/railsdog/spree

Not tried another RoR ecommerce template yet
http://code.google.com/p/substruct/

Rails command line seems much better than WP solution?
http://wordpress.tv/2009/06/08/create-an-ecommerce-website-with-wordpress-in-under-5-minutes/

Vision in Microscopes

2010-04-11T14:45:00.000-04:00

CID
http://micro.magnet.fsu.edu/primer/digitalimaging/digitalimagingdetectors.html

confocal
http://en.wikipedia.org/wiki/Confocal_microscopy

deconvolution
http://micro.magnet.fsu.edu/primer/digitalimaging/deconvolution/deconintro.html

Install git binaries on Godady Linux share host

2010-04-11T14:32:00.001-04:00

Godady Linux has no gcc, so need compatible binary, following tutorial
http://serverfault.com/questions/26836/setting-up-a-git-repo-on-my-godaddy-hosting-plan

Tried Rackspace Redhat 5.3 and CentOS 5.3 which are x64, therefore their binaries are not usable on godaddy's 32 server. Then compiled git from source on another 32 server (also Cent OS 5.3) and copied the binaries to Godady. It works!

Note:

To check Redhat version

http://rnyb2.blogspot.com/2006/02/checking-redhat-version-installed.html

cat /etc/redhat_release

Cent OS 5.3

To check glibc difference
http://www.linuxquestions.org/questions/linux-software-2/how-to-check-glibc-version-263103/

My machine:
e@e-laptop:~$ ldd --version
ldd (EGLIBC) 2.10.1

Godaddy share host server:
-bash-3.2$ ldd --version
ldd (GNU libc) 2.5

There are somewhat two different 'libc' (EGLIBC vs. GNU libc)
http://en.wikipedia.org/wiki/EGLIBC

LINQ and XML in C#

2010-04-11T14:21:00.001-04:00

A SQL like language (in query mode) for manipulating dataset.
http://github.com/yiwang/xmlinq

Make Red5 Server and Client Work!

2010-04-09T20:36:00.000-04:00

Finally got Red5 sever configuration right and a simple server and client connection setup.
http://www.red5.org/wiki/0_9_1

Following tutorial:
http://www.red5tutorials.net/index.php/Tutorials:Getting_Started_With_Red5_Server
http://www.actionscript.org/resources/articles/615/1/Getting-started-with-red5-server/Page1.html

Server side code:
http://github.com/yiwang/Red5FirstApp_server
1. using Eclipse Galileo
2. lots of energy spent on tweaking web.xml etc. spring framework (v3.0) configuration files, getting help from http://sunil-gupta.blogspot.com/2007/03/how-to-create-sample-application-using.html

Client side code (in different formats):
http://github.com/yiwang/Red5FirstClient_AS
http://github.com/yiwang/Red5FirstClient_MXML
http://github.com/yiwang/Red5FirstClient_AIR
http://github.com/yiwang/Red5FirstClient_FLA

commons-logging-1.1.1 is included in lib
http://commons.apache.org/logging/download_logging.cgi

Doctrine of Modularity

2010-02-28T23:32:00.000-05:00

Apply to function, but not content.

http://www.youtube.com/watch?v=zNJvGnI4VYA&feature=PlayList&p=7835614AE20903B4&index=3

回走的女生

2010-02-23T20:18:00.000-05:00

在L到6 AV下车的Path，一个女生从一乞讨者边走过4，5米，回走，把钱放入杯中

M60, from LGA to 116ST, Columbia

2010-01-27T00:48:00.010-05:00

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