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from pprint import pprint

from astropy.io import fits
hdulist = fits.open('new.fits', mode='update')
hdulist[0].header['ANI'] = "latitude longitude  altitude"
pprint(hdulist[0].header)
pprint(hdulist[0].data)
hdulist.flush()

hdulist.info()

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# Introduction
    - Solves the problem of limited memory space, by creating an illusion that
      more memory exists than is available in the system.
    - Two types of addresses in virtual memory systems
        * Virtual addresses: referenced by processes
        * Physical (real) addresses: describes locations in main memory


# Evolution of Memory Organization
  ├── Real Memory Systems

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Operating Systems (Third Edition)
Harvey M. Deitel, Paul J. Deitel, David R. Choffnes

-------------------------------------------------------------------------------
CHAPTER 9: Real Memory Organization
-------------------------------------------------------------------------------

# Memory Hierarchy
    - Main memory
        * Should store currently needed program instructions and data only

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Operating Systems (Third Edition)
Harvey M. Deitel, Paul J. Deitel, David R. Choffnes

-------------------------------------------------------------------------------
CHAPTER 5: Asynchronous Concurrent Execution
-------------------------------------------------------------------------------

# Introduction
    Asynchronous execution of threads
        * threads usually independent of one another

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Operating Systems (Third Edition)
Harvey M. Deitel, Paul J. Deitel, David R. Choffnes

-------------------------------------------------------------------------------
CHAPTER 4: Thread Concepts
-------------------------------------------------------------------------------

# Introduction
    - Applications contain threads of execution, each thread being designated a
      portion of a program that may execute concurrently with other threads.

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Operating Systems (Third Edition)
Harvey M. Deitel, Paul J. Deitel, David R. Choffnes

-------------------------------------------------------------------------------
CHAPTER 3: Process Concepts
-------------------------------------------------------------------------------

# Definition of Process
    - A process is a program in execution.
    - A process has its own address space consisting of the segments:

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Operating Systems (Third Edition)
Harvey M. Deitel, Paul J. Deitel, David R. Choffnes

-------------------------------------------------------------------------------
CHAPTER 2: Hardware and Software Concepts
-------------------------------------------------------------------------------

# Clocks
    - Computer time is measured in cycles.
    - Front Side BUS (FSB) connects processor to memory modules, operating at a

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Operating Systems (Third Edition)
Harvey M. Deitel, Paul J. Deitel, David R. Choffnes

-------------------------------------------------------------------------------
CHAPTER 1: Introduction to Operating Systems
-------------------------------------------------------------------------------

# Core Operating System Components
    * User interacts with the Operating System through
        - special application called shell

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Steps
-----

1. Clone this Github Gist by:
       git clone https://gist.github.com/9e6cec4bb0f8ee826fcd.git

2. Launch the Simulated Annealer for comparing the success probabilities by using
   the following command:
       bash launch.sh -p
   or

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Download the following files and keep them inside the same directory.

• launch.sh
• plot.py
• anneal.c
• [arXiv-1305-5837v1.tar.gz] http://arxiv.org/src/1305.5837v1

To launch the annealing algorithm, use the following command: bahs launch.sh