신기루(Mirage)와 Light Pillar

사용자 삽입 이미지


10월 4일 학교 하늘에서 보인 빛기둥들. 결론은 오징어 잡이 어선들의 불빛이 light pillar 현상에 의해서 사진처럼 보인듯 하다.

 

사용자 삽입 이미지

 

Light Pillars (대기중의 얼음입자에 반사된 빛이 나노로드(막대기) 처럼 보이는 현상.)

http://www.islandnet.com/~see/weather/eyes/pillars.htm (원리)
http://www.kuriositas.com/2011/08/ligh ··· ial.html (사진)

 

신기루 (공기의 밀도에 따른 빛의 굴절 현상, 빛은 항상 최단경로를 찾아서 이동한다!)


http://mintaka.sdsu.edu/GF/mirages/mirintro.html
http://virtual.finland.fi/public/default.aspx?contentid=160069&contentlan=2&culture=en-US

 

 

2011/10/08 22:27 2011/10/08 22:27

수학 기술 - 오카베 츠네하루


제목..제목...제목... 수학마저 기술적으로 기술하고 있다.
저자는 수학의 핵심이 논리적인 사고라는 것을 명쾌하게 설명하고 있다.



1. 수학적으로 생각해야 수학을 정복할 수 있다.

  • 수학이란 '문제의 핵심을 파악해서 해결하고, 그 과정을 논리적으로 설명하는' 것이다.
  • 수학 실력과 국어 실력 사이에는 아주 깊은 관계가 있다.
  • 교육 현장에서는 '싫어하는 것도 할 수 있도록 시키는' 것이 필요하다.
  • 수학적인 감각을 익히기 위해서는 계산 연습도 중요하다. 단, 여기에도 생각이 필요하다는 것이 중요하다.
  • 계산에 서툰 것을 수학을 싫어하는 것과 직접 연결시켜서는 안 된다.
  • 문제 해결에 실패했을 때는 '그 중에서 알만한 게 있겠지' 하는 가벼운 마음으로 임하자.
  • 처음에는 몰라도 따라하기를 반복 연습하다보면 그 원리를 알게 된다.
  • 증명하는 것보다도 이해하는 것이 더 중요하다.
  • 증명은 '자신이 이해한 것'이 옮음을 스스로 확인하고 이를 남에게 설득하는 수단이다.
  • 수학은 '본질을 파악하는' 능력을 키워준다.
  • 그 '파악한 본질'을 '사회구조의 분석'에 응용할 수 있다.
  • 하나의 문제에 대해 다양하게 접근하는 것은 중요하다.
  • 본질이 아닌 사소한 것에 너무 얽매이지 않는 것도 중요하다.
  • 수학은 상상력을 키워준다.



2 수학적으로 사고하기 위한 여덟 가지 방법

첫번째. 배움의 시작은 따라하기
두번째. '눈으로 보면 생각이 쉽다' -그림으로 나타내어 문제를 파악하라 (시각화)
세번째. 문제를 단순하게 만들기 -언뜻 보면 복잡한 문제도 실제로는 단순한 것에서 출발한다 (문제를 단순화 시켜라)
네번째. 새로운 것을 창조하기 위한 '일반화' - 언제나 딱 들어맞는 것을 찾아보자
다섯번째 '예측'하는 능력은 분석하는 능력 - 데이터를 정확하게 분석하면 예측할 수 있다
여섯번째 '분해'하면 명쾌해진다 -복잡하게 얽힌 문제는 나누어서 생각하라
일곱번째 '기호로 나타내기'에 친숙해지자 -추상화를 하면 쉬워진다
여덟번째 해법은 하나만 있지 않다 -다양한 접근 방법을 생각하라
2011/10/04 13:34 2011/10/04 13:34

사람은 무엇으로 사는가 - L. Tolstoy

톨스토이의 단편소설로 저자의 인생관을 짧은 이야기로 함축해서 써나가고 있다. 왜 대 문호이자 사상가라 불리는지 느낄수 있었던 작품인거 같다.


톨스토이는 아래 세가지 물음에 답을 재미있는 이야기로 풀어서 우리에게 들려주고 있다.


'사람의 마음에는 무엇이 있는가'
'사람에게 주어지지 않은 것은 무엇인가?'
'사람은 무엇으로 사는가?'
2011/10/04 13:09 2011/10/04 13:09

속독

JPCL Accepted!


12일만의 폭풍리비전. 제출하고 6시간만에 폭풍 Accept!!
이런게 바로 막강 트리플 교신저자의 힘인가.
그런데 논문 제출하고서 일이 너무 일사천리로 끝나버리니 기쁨뒤에 아쉬움이 밀려온다. 한두번 정도는 미끄러져야 하는데...

(8월 13일에 제출하고 어셉되는데까지 한달하고 열흘정도 걸렸다. 결과적으로 올해는 self 생일선물이라도 받은 셈이 되버렸군. 신기하게 어셉된 날짜는 교신저자중 한분인 근식이 형의 생일이기도 하다! 두명에게 셀프생일선물을 안겨주었구만!)


2011/09/26 16:44 2011/09/26 16:44

[VASP] Vacuum Level

Calculate vacuum level from VLINE ( output file of 'vtot') and DOSCAR.


#!/bin/bash
vac=`awk '{printf "%10.6f\n", $2}' VLINE |sort -g |tail -n 2 |sed -n '1p'`
fermi=`sed -n '6p' DOSCAR|awk '{printf "%10.6f\n",$4}'`
echo "Vaccum level="$vac    
echo "Fermi level="$fermi
echo "scale=4; $vac-$fermi"|bc -l

참 쉽죠?

2011/09/23 22:21 2011/09/23 22:21

[Firefox] DownThemAll

http://enchant.pe.kr/jwp.php?url=http% ··· _600.xml

위 링크로 가보면 House 음악이 600여곡 올라와있는데 다운로드 및 청취 모두 가능하다.
근데 곡 수가 무려 626!!!! 요즘엔 크롬만 써왔는데 이거 다운받을려고 크롬 확장프로그램 아무리 뒤져바도 파폭의 DownThemAll을 따라갈만한걸 찾지 못했다.
여튼 간단한 다운로드 경로 설정 후 폭풍 다운로드. 한 5~10분 걸렸나?

DownThemAll 확장프로그램 다운로드 : https://addons.mozilla.org/ko/firefox/addon/downthemall/
2011/09/20 19:48 2011/09/20 19:48

[Hot key] 단축키 모음

Windows Hotkeys 

Ctrl + Escape or Win: Display start menu.
Shift + F10 or AppsKey: Display context menu.
Win + E: Open Windows Explorer.
Win + R: Open Run dialog.
Win + M: Minimize all windows.
Win + Shift + M: Undo minimize all windows.
Win + D: Toggle minimize all windows.
Win + B (XP only): Activate system tray. Arrow keys select, Enter double-clicks, and AppsKey or Shift + F10 right-clicks. 
Win + L (XP Only): Locks keyboard. Similar to Lock Workstation. 
Win + F or F3: Open Find dialog. (All Files) F3 may not work in some applications which use F3 for their own find dialogs. 
Win + Control + F: Open Find dialog. (Computers)
Win + U: Open Utility Manager.
Win + F1: Open Windows help.
Win + Pause: Open System Properties dialog.
Win + Tab: Cycle through taskbar buttons. Enter clicks, AppsKey or Shift + F10 right-clicks. 
Win + Shift + Tab: Cycle through taskbar buttons in reverse.
Alt + Tab: Display CoolSwitch. More commonly known as the AltTab dialog. 
Alt + Shift + Tab: Display CoolSwitch; go in reverse.
Alt + Escape: Send active window to the bottom of the z-order.
Alt + Shift + Escape: Activate the window at the bottom of the z-order.
Alt + F4: Close active window; or, if all windows are closed, open shutdown dialog.
Shift while a CD is loading: Bypass AutoPlay.
Ctrl + Alt + Delete or Ctrl + Alt + NumpadDel (Both NumLock states): Invoke the Task Manager or NT Security dialog.
Ctrl + Shift + Escape (XP Only): Invoke the task manager. On earlier OSes, acts like Ctrl + Escape. 
Printscreen: Copy screenshot of current screen to clipboard.
Alt + Printscreen: Copy screenshot of current active window to clipboard.
Ctrl + Alt + Down Arrow: Invert screen. Untested on OSes other than XP. 
Ctrl + Alt + Up Arrow: Undo inversion.


Windows + Up Arrow
It is used to maximize the current window which is in focus, whether it is a windows explorer, a web browser, or any other application.
Windows + Left Arrow
Adjusts the current window to the left side and hence the window will cover almost half of the desktop space.
Windows + Right Arrow
It will adjust the current window to the right and thus it will cover half of the desktop space on the right.
Windows + Down Arrow
Minimizes The Windows To The Task Bar.
Windows + T
Shows The Thumbnail Preview Of The Running Applications.
Shift + Click A Taskbar Item
It opens a new instance of the particular application on which you clicked.
Windows + X
It is used to run the Windows Mobility Center.
Windows + E
It is used to open the Windows Explorer.
Windows + [Number]
It is used to run the pinned applications on the taskbar, Windows + 1 will run the first pinned application on the task bar, similarly Windows + 2 will run the second pinned application and so on.
Ctrl + Windows  + F
Search for computers if you are on a network
Ctrl + Shift + Click On Icon [Task Bar]
It  is used to open a new instance of the particular application from the taskbar with administrator privileges.
Alt + D
It is used to select the address bar
Alt + Win + [number]

Opens the jumplist for the applications which are pinned to the task bar.
Shift + Right-click on a taskbar button
It is used to display the window menu for the specific taskbar application
Ctrl + Shift + N

It is used to create a new folder in the windows explorer.
Shift + Right-click on a folder
It is used to add the command prompt option to the Folder, so you can easily open the command prompt in that particular folder.
Shift + Right-click on a grouped taskbar button

It is used to launch the windows menu for the group.
Ctrl + Click on a grouped taskbar button

It is used to cycle between the windows of the group.
Win + G
It is used to cycle between the Gadgets on the screen.
Ctrl + Esc

This hotkey is used to open the Start Menu.
Ctrl + Shift+Esc
It is used to directly open the Windows Task Manager.


Generic 

Ctrl + C or Ctrl + Insert: Copy.
Ctrl + X or Shift + Delete: Cut.
Ctrl + V or Shift + Insert: Paste/Move.
Ctrl + N: New... File, Tab, Entry, etc. 
Ctrl + S: Save.
Ctrl + O: Open...
Ctrl + P: Print.
Ctrl + Z: Undo.
Ctrl + A: Select all.
Ctrl + F: Find...
Ctrl + F4: Close tab or child window.
F1: Open help.
F11: Toggle full screen mode.
Alt or F10: Activate menu bar.
Alt + Space: Display system menu. Same as clicking the icon on the titlebar. 
Escape: Remove focus from current control/menu, or close dialog box.


Generic Navigation 

Tab: Forward one item.
Shift + Tab: Backward one item.
Ctrl + Tab: Cycle through tabs/child windows.
Ctrl + Shift + Tab: Cycle backwards through tabs/child windows.
Enter: If a button's selected, click it, otherwise, click default button.
Space: Toggle items such as radio buttons or checkboxes.
Alt + (Letter): Activate item corresponding to (Letter). (Letter) is the underlined letter on the item's name. 
Ctrl + Left: Move cursor to the beginning of previous word.
Ctrl + Right: Move cursor to the beginning of next word.
Ctrl + Up: Move cursor to beginning of previous paragraph. This and all subsequent Up/Down hotkeys in this section have only been known to work in RichEdit controls. 
Ctrl + Down: Move cursor to beginning of next paragraph.
Shift + Left: Highlight one character to the left.
Shift + Right: Highlight one character to the right.
Shift + Up: Highlight from current cursor position, to one line up.
Shift + Down: Highlight from current cursor position, to one line down.
Ctrl + Shift + Left: Highlight to beginning of previous word.
Ctrl + Shift + Right: Highlight to beginning of next word.
Ctrl + Shift + Up: Highlight to beginning of previous paragraph.
Ctrl + Shift + Down: Highlight to beginning of next paragraph.
Home: Move cursor to top of a scrollable control.
End: Move cursor to bottom of a scrollable control.


Generic File Browser 

Arrow Keys: Navigate.
Shift + Arrow Keys: Select multiple items.
Ctrl + Arrow Keys: Change focus without changing selection. "Focus" is the object that will run on Enter. Space toggles selection of the focused item.
(Letter): Select first found item that begins with (Letter).
BackSpace: Go up one level to the parent directory.
Alt + Left: Go back one folder.
Alt + Right: Go forward one folder.
Enter: Activate (Double-click) selected item(s).
Alt + Enter: View properties for selected item.
F2: Rename selected item(s).
F7: New folder.
Ctrl + NumpadPlus: In a Details view, resizes all columns to fit the longest item in each one.
Delete: Delete selected item(s).
Shift + Delete: Delete selected item(s); bypass Recycle Bin.
Ctrl while dragging item(s): Copy.
Ctrl + Shift while dragging item(s): Create shortcut(s).

In tree pane, if any:
Left: Collapse the current selection if expanded, or select the parent folder.
Right: Expand the current selection if collapsed, or select the first subfolder.
NumpadAsterisk: Expand currently selected directory and all subdirectories. No undo. 
NumpadPlus: Expand currently selected directory.
NumpadMinus: Collapse currently selected directory.


Accessibility 

Right Shift for eight seconds: Toggle FilterKeys on and off. FilterKeys must be enabled. 
Left Alt + Left Shift + PrintScreen: Toggle High Contrast on and off. High Contrast must be enabled. 
Left Alt + Left Shift + NumLock: Toggle MouseKeys on and off. MouseKeys must be enabled. 
NumLock for five seconds: Toggle ToggleKeys on and off. ToggleKeys must be enabled. 
Shift five times: Toggle StickyKeys on and off. StickyKeys must be enabled. 


Microsoft Natural Keyboard with IntelliType Software Installed 

Win + L: Log off Windows.
Win + P: Open Print Manager.
Win + C: Open control panel.
Win + V: Open clipboard.
Win + K: Open keyboard properties.
Win + I: Open mouse properties.
Win + A: Open Accessibility properties.
Win + Space: Displays the list of Microsoft IntelliType shortcut keys.
Win + S: Toggle CapsLock on and off.


Remote Desktop Connection Navigation 

Ctrl + Alt + End: Open the NT Security dialog.
Alt + PageUp: Switch between programs.
Alt + PageDown: Switch between programs in reverse.
Alt + Insert: Cycle through the programs in most recently used order.
Alt + Home: Display start menu.
Ctrl + Alt + Break: Switch the client computer between a window and a full screen.
Alt + Delete: Display the Windows menu.
Ctrl + Alt + NumpadMinus: Place a snapshot of the entire client window area on the Terminal server clipboard and provide the same functionality as pressing Alt + PrintScreen on a local computer.
Ctrl + Alt + NumpadPlus: Place a snapshot of the active window in the client on the Terminal server clipboard and provide the same functionality as pressing PrintScreen on a local computer.


Mozilla Firefox 1.x 

Ctrl + Tab or Ctrl + PageDown: Cycle through tabs.
Ctrl + Shift + Tab or Ctrl + PageUp: Cycle through tabs in reverse.
Ctrl + (1-9): Switch to tab corresponding to number.
Ctrl + N: New window.
Ctrl + T: New tab.
Ctrl + L or Alt + D or F6: Switch focus to location bar.
Ctrl + Enter: Open location in new tab.
Shift + Enter: Open location in new window.
Ctrl + K or Ctrl + E: Switch focus to search bar.
Ctrl + O: Open a local file.
Ctrl + W: Close tab, or window if there's only one tab open.
Ctrl + Shift + W: Close window.
Ctrl + S: Save page as a local file.
Ctrl + P: Print page.
Ctrl + F or F3: Open find toolbar.
Ctrl + G or F3: Find next...
Ctrl + Shift + G or Shift + F3: Find previous...
Ctrl + B or Ctrl + I: Open Bookmarks sidebar.
Ctrl + H: Open History sidebar.
Escape: Stop loading page.
Ctrl + R or F5: Reload current page.
Ctrl + Shift + R or Ctrl + F5: Reload current page; bypass cache.
Ctrl + U: View page source.
Ctrl + D: Bookmark current page.
Ctrl + NumpadPlus or Ctrl + Equals (+/=): Increase text size.
Ctrl + NumpadMinus or Ctrl + Minus: Decrease text size.
Ctrl + Numpad0 or Ctrl + 0: Set text size to default.
Alt + Left or Backspace: Back.
Alt + Right or Shift + Backspace: Forward.
Alt + Home: Open home page.
Ctrl + M: Open new message in integrated mail client.
Ctrl + J: Open Downloads dialog.
F6: Switch to next frame. You must have selected something on the page already, e.g. by use of Tab. 
Shift + F6: Switch to previous frame.
Apostrophe ('): Find link as you type.
Slash (/): Find text as you type.


BBCode (This forum's posting) 

While text is selected: 
Alt + B: Format text in bold.
Alt + I: Format text in italics.
Alt + U: Format text as underlined.
Alt + Q: Format text as a quote.
Alt + C: Format text as code.
Alt + L: Format text as a list.
Alt + O: Format text as an ordered list.
Alt + P: Format url as a hotlinked image.
Alt + W: Format url as a hyperlink.


GMail 

Must have "keyboard shortcuts" on in settings. 
C: Compose new message.
Shift + C: Open new window to compose new message.
Slash (/): Switch focus to search box.
K: Switch focus to the next most recent email. Enter or "O" opens focused email. 
J: Switch focus to the next oldest email.
N: Switch focus to the next message in the "conversation." Enter or "O" expands/collapses messages. 
P: Switch focus to the previous message.
U: Takes you back to the inbox and checks for new mail.
Y: Various actions depending on current view:
Has no effect in "Sent" and "All Mail" views. 
  • Inbox: Archive email or message.
  • Starred: Unstar email or message.
  • Spam: Unmark as spam and move back to "Inbox."
  • Trash: Move back to "Inbox."
  • Any label: Remove the label.

X: "Check" an email. Various actions can be performed against all checked emails.
S: "Star" an email. Identical to the more familiar term, "flagging." 
R: Reply to the email.
A: Reply to all recipients of the email.
F: Forward an email.
Shift + R: Reply to the email in a new window.
Shift + A: Reply to all recipients of the email in a new window.
Shift + F: Forward an email in a new window.
Shift + 1 (!): Mark an email as spam and remove it from the inbox.
G then I: Switch to "Inbox" view.
G then S: Switch to "Starred" view.
G then A: Switch to "All Mail" view.
G then C: Switch to "Contacts" view.
G then S: Switch to "Drafts" view.




Reference
http://www.autohotkey.com/forum/topic1841.html
http://www.addictivetips.com/windows-t ··· guide%2F
2011/09/20 18:12 2011/09/20 18:12

[Yanko] Ear candy

Drakensang online