Welcome to Computational Physics

            Prof. Suk-Joon Lee,     Physics Department

• Numerical calculation, simulation ; complex nonlinear system
• Symbolic Math Equation Manipulation ; Mathematica, Maple
• Controling experiment, data analysis ; LabView
• Writing paper, drawing figures --> Word processor, Graphics
• Information and data exchange --> Network
• Virtual demonstration : Java Applet, Flash   

• CPU(Central Processing Unit), GPU(Graphic Processing Unit), PPU(Physics Processing Unit), Math
• IC Chip, Semiconducting material
• Memory elements ; magnetic, optical, atomic, ...
• Peripherals ; printer, scanner, OCR, ...
• Display ; VCR, (TFT) LCD, FED, Plasma, LED, ...
• Communication media ; cable (phone, TV, power), fiber, wireless (wave), ...

• Preprint depository ; Example
• Data exchange : email, ftp,
• Calculation through PC network, Grid Computing ; Example1
• Paper submission to Journal ; Example
• Published journal access ; JKPS

• Network cable ; Eathernet, Phone line, Cable TV line, Power line, Optical fiber, Wave, Satellite, Token ring, FDDI
• Network Interface Board ; Modem, LAN card, USB
• Communication control protocol ; TCP/IP, SLIP/PPP, Winsock
• Communication Service Protocol ; Telnet, Xterm, ssh, FTP, Mail, http

• Personal Computers : DOS, Windows, NT, XP, Linux, Mackintosh
• Work Station : Unix, VMS
• Main frame, Super computer, Cluster Computing
• CPU(Central Processing Unit), GPU(Graphic Processing Unit), PPU(Physics Processing Unit), Math

• Terminal : WS or main system with terminal server ; one to many
• Virtual terminal ; Terminal emulator ; PC to WS ; many to many
• xterminal : X-Window ; PC to WS
• Modem : Dialup, DSL, Cable, WiFi, WiBro
• LAN : IP address, Domain Name

• Remote login : Telnet, Rlogin, Host ; NetTerm, X-Win, VTE, htn, Dialup, PuTTY, SSH, ...

      Telnet command

  telnet physics.khu.ac.kr

  Login procedure (username, password)

  System Commands

      Dialup Modem

  atdt 205-7000 (961-0951~0966)

  at khnet# connect physics

  Login procedure (username, password)

• E-mail : mail, elm, mailx, pine, eudora, outlook express, web mail, ...
• File exchange : FTP, WS_FTP, WinSCP, PSFTP, SSHftp, Kermit, X-modem, Z-modem, ...

      FTP command

  ftp physics.kyunghee.ac.kr

  login procedure (username, password)

  Commands ; help, dir, put mput, get, mget, cd, bin, ascii, ...

• Information exchange : World Wide Web (http), News, ...
      WWW : Netscape, Internet explore, Mosaic, Gopher, Mozilla, Firefox, ...

• fort77 -o filexec filename.f -l library   :   Compile and Link Fortran Program at Unix System (or f77)
• ./filexec   :   Execute the execution file created by fort77 at Unix system
• Structure of Fortran Program
  PROGRAM progname [(......)]
  .........
  .........
  STOP
  END
  SUBROUTINE subname (......)
  .........
  .........
  RETURN
  END
  type FUNCTION funcname (......)
  .........
  .........
  RETURN
  END

• cc -o filexec filename.c   :   Compile and Link C Program at Unix System (or g77)
• ./filexec   :   execute the execution file created by cc at Unix system
• Structure of C Program
  Preprocessor (#include, #define, .....)
  main ()
  {......... ;
  .......... ;
  .......... ;}
  type subname (.....)
  {......... ;
  .......... ;
  .......... ;}

• Interpolation (Lagrange's n-th order Interpolation)
• Derivative (n-point derivative)
• Integration (Trapzoidal, Simpson's, Bode's rule)
• Searching Roots (zeros) (Newton-Raphson, Secant method)

• Euler's Method
• Adams-Bashforth 2-step Method (use Extrapolation)
• Adams-Moulton Method (use Interpolation) ; Predictor-Corrector Algorithm
• Runge-Kutta Method

• Numerov Algorithm
• Green's Function Solution ; Boundary Condition
• Eigenfunction ; Shooting method, Matching

• Recursion for Special functions
• Gaussian Quadrature ; Integral using special function

• Matrix Inversion
• Eigen Value Problem
• Inverse Vector Iteration
• Damped Gradient Iteration
• Lanczos Algorithm

• Discretization and Variational Principle
• Iterative Gauss-Seidel Method
• Boundary Value Problem
• Gaussian Elimination

• Monte-Carlo Method
• Metropolis Algorithm

• Data Acquisition
• Data Analysis
• Equipment Control
• Interface ; General Purpose Interface Bus (GPIB) Board
• A/D Converter
• D/A Converter
• Amplification and Noise

• Mean Value and Standard Deviation
• Chi-Square Fitting and Error Analysis
• Fourier Transform (FFT)
• Wavelet Analysis

• Interactive and Noninteractive Graphics : Excell, Axum, PGPLOT, ....
• Graph Out File : Post Script (Encapsulated PS) file, ....
• Text Editor : Ascii Editor (Notepad, Wordpad, ...), HWP, MS-editor, ....
• Tex, Latex, Revtex ; sample TeX -> Result     Hpack     LaTex Commands LaTex Commands Result
• Presentation ; ppt