Computer Science 2017: February 2017

NCBI

11:39 PM

Image result for internet picture tumblr

We learnt how to use the NCBI site last week. NCBI actually stands for National Center for Biotechnology Information and it is a site that houses a series of databases relevant to biotechnology and biomedicine and is an important resource for bioinformatics tools and services. Major databases include GenBank for DNA sequences and PubMed a bibliographic database for the biomedical literature.

The reason to us learning how to use the NCBI site is because our second assignment, after this blog assignment is to do a research on a given gene assigned to our groups by Dr. Azran using the NCBI site and even search for journals from that site.

Firstly we learnt how to search data (article and gene) using the search tool. The options are Nucleotide, Blast, Gene, PubMed and DNA and RNA. The nucleotide database is a collection of sequences. Blast consists of protein Blast- Blastx- Tblastin- Recent results- Tblastx. For gene, a portal to gene-specific content based on NCBI's RefSeq project. PubMed comprises more than twenty million citations for biomedical. For DNA&RNA: GeneBank- Nucleotide-Assembly-BioSample.

We learnt that we can search for article using PubMed using different keywords. For example if we use the keyword Yamanaka (full name: Shinhya Yamanaka, a Japanese Nobel Prize-winnin stem cell researcher) to search for data we will get a different data, maybe more results compared to when we search using the keyword Yamanaka S. We can also specifically search using keyword Yamanaka s AND Cell to specifically search for articles on Shinhya Yamanaka's cell articles.

Thank you.

PLOTTING GRAPH IN EXCEL

11:25 PM

To calculate the average , insert the formula

=AVERAGE(insert the data required),and then enter for the result.

To calculate the variance , insert the formula

=VAR(insert the data required),and then enter for the result.

To calculate the standard deviation , insert the formula

=STDEV(insert the data required),and then enter for the result.

Select the data required and select 'scattered' graph from the

icons

Adjust the axis to suit the size of the graph

Right click at any point in the graph,choose 'trendline' and select linear

to get the straight line axis

tick the boxes for the formula that you need! Done!

1:16 AM

INTERNET

WHAT IS THE "VICTORIAN INTERNET"???

THE TELEGRAPH
INVENTED IN 1840'S
MORSE CODE WAS DOTS AND DASHES, OR SHORT SIGNALS AND LONG SIGNALS

WHAT IS THE INTERNET???

THE LARGEST NETWORK OF NETWORKS IN THE WORLD
USES TCP/IP PROTOCOLS

HISTORY OF INTERNET

EVOLUTION OF INTERNET

12:37 AM

CONVERTING BINARY TO IP ADDRESS AND VICE VERSA

To convert binary into IP address:

- Fill in the table with all the numbers in the code. For each row, list the number which contains the binary 1. Add up the numbers. Do this to all the rows. Arrange the sum into a 4 8 bit octects

64+16+8+4+2= 94

16+4= 20

128+64+2+1= 195

128+64+16+8+4= 220

Code = 94.20.195.220

The code given : 216.1.21.171

To convert IP address into 32 bit binary code:

- Take the first number(216) and subtract the first number from the left(128). If this result in a positive answer, write the number 1 into the first box. Use this answer to subtract the next number along the row. If this gives a negative number, write the number 0 in the box but do not proceed with the subtraction. Instead use the number for the next one in the row. Repeat this for all the row to produce the binary code

The 32-bit binary had been given so we need to find the IP address by using this method:

216-128-64-16-8= 0

1-1= 0

21-16-4-1= 0

171-128-32-8-2-1= 0

5:03 AM

HTML

Assalamualaikum. Hey guys!

This is our first post! This first week being in Computer Science class, we learnt about HTML. What is HTML, you might ask. Well, HTML is the abbreviation for Hypertext Markup Language. With HTML, you can create your own website. HTML is not a programming language, it is a markup language; a set of markup tags. HTML uses markup tags to describe the appearance of webpages. It is not a case sensitive language. HTML documents contain HTML tags and plain text.

Where do you write HTML code?

HTML code can be written and modified using professional HTML editors. However, for new learners of HTML like ourselves, a simple text editor such as Notepad (PC) or Textedit (MAC) can be used.

- All HTML documents start with <!DOCTYPE html>
- The <!DOCTYPE html> declaration defines this document to be HTML 5
-The <html> element is the root element of an HTML page
- The HTML itself begins with <html> and ends with </html>
- The <head> element contains meta informatio about the document
- The <title> element specifies a title for the document
- Followed by <body> which is ended with </body>
- The <body> element contains the visible page content
- The<h1> element defines a large heading
- The <p> element defines a paragraph
- Once the HTML is written, it is saved by a selectng; File ---> Save As
- The file is named e.g; "File.html" and the encoding is set to "UTF-8" (a preferred encoding for HTML files). Click "Save".
- To view the HTML, open the file by double clicking the file or right- click and choose "Open with"

What is <!DOCTYPE> Declaration?

- The <!DOCTYPE> declaration represents the document type, and helps browsers to display web pages correctly. It must only appear once, at the top of the page, before any HTML tags. The <1DOCTYPE> declaration is not case sensitive. The <!DOCTYPE> declaration for HTML is: <!DOCTYPE html>

What is the most recent of HTML?

There are three versions of HTML still in regular use around the Internet. They are HTML 3.2, HTML 4.0 and HTML 4.01.

What are the codings in HTML?