วันจันทร์ที่ 30 มกราคม พ.ศ. 2555

Chapter.10 Pros And Cons of Information Technology / Advantage and Disadvantage of IP

Information Technology Pros
1. The world got flexibility
 What we think, do or plan must be shared with our co-workers, colleagues and friends. The internet technology has advanced this system to a great extent. The telephone idea (by Alexander Graham Bell) has been modified and made as Cell Phones to increase more flexibility in communication and talk to our dear fellows whenever we require!

2. The sense of responsibility has increased
Let us take ‘Barack Obama- USA President’ as the figure. With the use of networking sites (Twitter and Facebook), blogs, social bookmarking, the leader can approach to the world whenever necessary and we can receive the news and updates which he has done (or wants to be done by us) within a very short period.

3. Easy thinking & evolution in transportation

To think and to research, we need resources to find what our past people has thought, what quotes they have left for us (+information + theory). We can find them by a single click in search engines (specially Google, Yahoo!). By getting a clear cut idea, we get the chance of contributing the world with new technological ideas and inventions and share what we have learnt throughout our lives.
And throughout the ages, it helped us to evolute the transportation strategy which helps us to visit from a place to another by (Roads, highways, air, water and in the skies!)

4. Saves thousand of lives daily
So, by the point heading I hope you understand I am referring towards Medical Sector development. Each day people are getting relief by the perfect use of Medicine, Hospital Technology with addition of (X-Rays, Laser Treatments) and more on the queue. By the combination of the World Health Organization, various fatal diseases can be overcome and just expelled from specified countries by quick plans and ideas.

5. Increase the sense of Human Rights
The technology can remind of our human rights, basic needs and give updates where relief or worldwide help is necessary. During earthquakes, terrible floods, while co-operation is necessary the World Wide Web can help us to collect the donation by a desired amount.
It is not possible to just figure out everything about the good and bad sides of Information and Technology within a page and article as because it has mixed with every aspects and corners of our lives. Rather, let us look at the side effects, bad sides (cons) which IT-sectors have brought to the Human Society.

Information Technology Cons
1. It has taken away people’s Privacy 
As IT-Sectors have wined the people’s heart worldwide. People are here to share and store any kind of information, private date in their hard drives and private online databases. But due to some Cyber-Criminals, nothing is SO Safe both online and offline. If someone becomes a bit careless, s/he may needs to pay high for it. (It’s serious).

2. The online community is not safe for Family anymore
Children under age may often share Cell Numbers, Private Email Address which can be hacked by people and can pass it to the criminals who have a blue-print to harm the society. And people are loosing credit card privacy and other payment processing options. Again, there are some sites created by Nasty Guys, which can lead under eighteen teenagers to a different path – That Is Going To Bring Harms To The Nation.

3. It is going to damage a Human’s Natural Power
We can think, gather human principles (ethical knowledge) and make co-operative relationships between friends and families. But due to harmful aspects of (IT) people are becoming fully technological based. And it can bring huge damage to the society as its taking away the natural thoughts and organic ideas.

4. It can bring World Destruction without Efficient Administration
This is an extra point which I am writing by remembering various Science Fictions. Great scholars have though about the matter wisely. Til now, we (humans) are possessing the leading place in the world and administering the computer technology. But a day MAY come when the technology is going to administer us in all aspects. It may probably happen that we are converted to the slaves of Technology.
So, by this cons I am not trying to tell that Technology is here to bring harms only, because I myself is a technological man who passes 24 hours browsing computer and talking on phones. But as a part of human society we need to give up a look at the both sides of IT.

The Advantage of Using IP

IP enables cross-platform, or heterogeneous, networking. For example, a Windows NT/2000 network could contain Unix and Macintosh workstations or even networks mixed in it. TCP/IP also has the following characteristics:
  • Good failure recovery
  • The ability to add networks without interrupting existing services
  • High error-rate handling
  • Platform independence
  • Low data overhead
Because IP was originally designed for Department of Defense–related purposes, what we now call features or characteristics were actually design requirements. The idea behind "Good Failure Recovery" was that if a portion of the network were disabled during an incursion or attack, its remaining pieces would still be able to function fully. Likewise is the capability of adding entire networks without any disruption to the services already in place. The ability to handle high error rates was built in so that if a packet of information got lost using one route, there would be a mechanism in place to ensure that it would reach its destination using another route. Platform independence means that the networks and clients can be Windows, Unix, Macintosh, or any other platform or combination thereof. The reason IP is so efficient lies in its low overhead. Performance is key for any network. IP is unmatched in its speed and simplicity.

Disadvantage of Internet Protocol 

1. SYN Attacks
  • The Internet Protocol uses a three-way handshake system. Under this system the user contacts a server, which then sends a response back to the user asking the user to confirm the connection. The computer hosting the connection must then wait 75 seconds to receive a response to the acknowledgment, to compensate for network slowdown. SYN attacks work by sending the first request but not the second over and over again. This monopolizes the computer's resources, causing other legitimate connections to fail.

2. Sequence Manipulation

  • The Internet Protocol keeps packets of information in sequence. If a user goes offline, either by a malicious user's designs or other means, any computers it is currently communicating with will close the connection if a response without the proper sequence number is received. If a user intercepts these messages he can discern the ID number and respond as the user, resulting in communication with the machine being hijacked. This can cause theft of important data.

3. Amorphous Identification

  • The Internet Protocol was designed to only allow a single connection at a time and to have this connection be routed to a definite user. As the Internet has progressed and IP address space becomes increasingly precious, this address space is no longer dedicated and is usually assigned among a pool of users. This lack of unique identification makes it hard to verify a user and adds to the complexity of an application's security by removing trust in the identity of the user.

4. DNS Flaws

  • The Domain Name Service (DNS) is a way of looking up the IP address of a domain name. Internet Protocol can only communicate to IP addresses, requiring Internet communication to occur through a DNS server maintained by your Internet Service Provider. This flaw can be exploited by redirecting domain names to different IP addresses.

 REFERENCE

วันจันทร์ที่ 23 มกราคม พ.ศ. 2555

CHAPTER 9 Good websites and bias information


GOOD WEBSITE

Color Schemes

A successful color scheme is key to building the mood and atmosphere for any kind of design. A common mistake that is often made by web designers is that they overlook the importance of a well-planned out color scheme. The choice of color not only affects the aesthetic appeal but also user experience of the target audience.

Many experienced web-designers have learned that colors should be relevant to the purpose of the design and correspond to the mood of the content. For example Feed Stitch uses bright and vivid colors from the spectrum to illustrate a lively and fun mood, which is directly linked to its purpose of combining different syndication feeds into one unified feed.

There are times and situations where there is a need to hold back and put a restraint on using bright and eye-catching colors as it is just not appropriate for the design. There are other ways of achieving quality with less exaggerated color schemes. Ploc Media is a fine example for this – The aqua marine blue emphasizes the product/service on the dark grey design. The designer effectively highlighted the primary focus of the website by creating this contrast.
Deciding on a color scheme can be difficult so designers should constantly experiment and find out which hues go well together, but at the same time making sure the colors are relevant to the product/service the website is promoting.

Spacing and Negative Space

Just because there is an empty area, doesn’t mean it has to be filled. Design elements should be spread out and clear. Even the space between text can make a huge difference to the overall appearance of the website.

White space on a page is often called negative space (and isn’t always white). It balances the overall layout and adds contrast to the page. Magazine adverts for luxury items like expensive cars and watches laid over a 2-page spread often make use of empty space to accentuate the product making it appear more elegant and chic. The Digital Mash website is an example of a well spaced design. The header navigation and the links at the bottom are well spaced, yet the elements are not too far away from each other making it a very practical design also. The main graphic exhibits a lot of empty space which doesn’t appear to be wasteful at all.

Another example of an excellently spaced design is the front page of Cultured Code. At the top you can see a user-friendly navigation bar with each and every item appropriately divided. Then, following a big gap is the heading and the 2 large icons that are also spaced evenly within each other. This creates a very welcoming yet simple front page.
Like color, spacing is really just another thing designers should experiment and play around with. The trial and error method can be used to find out what looks the best. Negative space also forces designers to display only the important content without cramming large amounts of information in a small space. Also, designing with a grid system or css frameworks such as 960 and blueprint gives designers the opportunity to learn more about spacing and understand the importance of it in quality design.

Typography

The appearance of the content is defined by the typographic choices made by the designer. It is up to the designer to make sure the text content is legible and easy to follow. Many people think typography is just about fonts but it is actually much more complicated than that. You also have to consider about the font spacing, the font sizes, and spacing (yes, here comes spacing again).

The Netsetter is a brilliant example of good typography in web design. Its combination of sans-serif and serif typefaces is outstanding. The paragraphs are well structured and each line is clear and readable. A heavy and bold font style used in the headings and titles give emphasis to the article. The spacing between each line and paragraph is optimal and makes the articles very comfortable to read.
Generally, the default values for font styles are not enough. For example the default line spacing is too little and doesn’t make large chunks of text very readable. The technique of changing the line spacing is called leading which originates from the printing press process where they placed lead bars of varying thickness between lines. Keep this in mind as it significantly affects the overall structure and legibility of the content.

Detail and Subtlety

Subtle additions to a web design can make such a big difference to an overall appearance. Web designers often focus on adding small, subtle details such as gradients, shadows, and inset pixel dividers. The following are examples of web designs that use these extra elements to enhance the overall design.


REASON

The reason why I choose this web site because this website is contain all of the new information and detail for the people, who love in supercar.

BIAS INFORMAION

Biased information is rarely neutral. Every writer wants to prove his point, and will use the data and information that helps him accomplish this. 

First, be aware that organizations, businesses, and individuals represent their own viewpoints. If organizations or businesses have a particular mission in mind, then they may publish only information that supports their point of view.

Second, look to see if what the author is saying is deviating from the truth, applying his personal prejudices, opinions, or thoughts. 

Third, does this document reside on the Web server of an organization that has a clear point with the issue discussed? If you are reading about a political figure at the Web site of another political party, then you are definitely reading the opposition.

Fourth if you are looking for something specific then do you trust the information given? If you are looking for some scientific information, would you trust a political organization to provide it? Different extreme points of view are not always easy to detect. Some sites promoting these particular views may look educational. Much of the research that is done often deals with very controversial questions. A lot of times the more controversial an issue is, the more interesting it is to the reader.

If anyone has any financial, emotional, or political ties to the issue at hand, they are biased.