Transcript Client

Important skills for
Computer Based
Researching
Peter Szluka, Attila Skulteti
2012. 09.17
Network Communication

Network: A group of computers connected
through a communication channel. (Internet)
 Two

types of computers: server and client
Client-Server connection
 Dedicated computer,answers the requests: server
 For example: Web servers, database servers etc..
 The one that makes the requests: client
 Typically home, or end-user computers
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Network Communication
How computers find each other?
IP address: ID of the computers connected
to the internet.
Format: x.x.x.x, x={0-255}
 Domain name: Like IP address, but easy
to memorize. Translation: DNS servers
eg.: www.lib.sote.hu=193.6.208.49

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Network Communication

Limitations of IP address: (IPv4)
4 000 000 000 unique address (232)
 IP exhaustion soon
 Solution: Network Address Translation
 around
Real Solution : IPv6 (Internet Protocol
version 6)
 128 bit adresses – much much more
possible address and better structure

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Network Communication
Client No. 1
Computer (DSL, Dialup)
195.56.231.109
Server
IP: 193.6.208.49
Domain: www.lib.sote.hu
NAT
Computer 1:
Local (inner) IP: 10.2.1.15
Real (outer) IP: 193.6.208.42
(Authentication)
NAT: Network address translation
Proxy server 1
(eg. DSL Router)
193.6.208.42
Client
Computer 1
10.2.1.15
Client
Computer 2
10.2.1.18
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Network Communication
Database ‘login’ types, authentication

IP identification
 Automatic
method, no Username or Password
needed.
 Only for fixed IP-s

Password authentication
 From
any IP (You can use it at home)
 Not automated (Number of problems increased by
number of databases, forgotten, stolen password)

Combined (IP and Password)
 Rarely
used. Data acquisition, login statistics (eg.
EISZ)
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URL format


Format:
protocol://servername.domain.country
HTTP:// Hyper Text Transfer Protocol
 For

HTML pages, Default value of the browsers
FTP:// File Trasfer Protocol
 Downloading


files
Server name: In most cases WWW (World
Wide Web) Can be different: http://images.md
WWW is NOT need in every URL!
Domain: Usually shows the structure of the
institute
Eg.: lib.sote.hu (.hu: Hungary, .sote:Semmelweis
University, .lib:Library)
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Word processors

Microsoft Word (2003, 2007, 2010 etc..)
 Part

of MS Office, widespread
Open Office
 Free,

WordPad
 You

similar to MS Office, compatibility problems.
can use it in the library. „Word lite”
Notepad (Plain text)
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Document formats

DOC and DOCX (MS Word)
 Compatibility

problems
Rich Text (.rtf)
 Recommended

to use with Wordpad
Plain Text (.txt)
 Just
characters, formatting is not available
(Bold fonts, font type, etc.)
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E-journals, Article formats
PDF Full-text

PDF (Portable Document Format, Adobe)
 Reprint
format (Like photocopies)
 File size can be large (depending format and page
number)
 Easy to save (if it is not copy protected)
 Not easy to „reuse” the article (small Pictures)
 Adobe Reader must be installed to view articles
 Reading on small displays is problematic.
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E-journals, Article formats
HTML Full-text

HTML (Hyper Text Markup Language)
 Showed
by your Internet Browser
 Easy to read
 Problems with printing
 Problems with saving
 Good for „Reusing” pictures, tables, etc.
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Link Resolver systems



Automated searches with the bibliographic data
of the results, when you search in a database
(like Medline)
Full text link appears in every record in the result
list. (If there is a full text available)
Fault possibility: Dynamic full-text databases. (If
you really need the article and full-text link does
not appears, in some cases you can find it in the
e-journals database at www.lib.sote.hu)
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Base Logic operators – Set theory
Set
Union
Boole Algebra
OR
Section
AND
Complement NOT
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Using the clipboard
A storage tool, wich allows to save, and
reuse data temporarily (text, images, etc.)
 Always stores the last saved data. (some
programs, like Office can store more data
at once)

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Using the clipboard

Copy-Paste:
 Ctrl-C:
puts the selected data into the
clipboard
 Ctrl-V: copy the data from the clipboard

Printscreen
 PrtScr:
the picture of the whole desktop
appears on the clipboard as an image
 Alt+PrtScr: Only the selected window’s image
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Thank you for your attention!
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