Jan. 10th                                  

" Smile is the best medicine and contagious."-----Dr.Ebrahimi.

Tomorrow we are going to have the first quiz.  Everyone is supposed to make 10 questions for the quiz.  I did this yesterday and the rest work for the quiz for me is to review the notes and some questions in teacher's site.

Midterm is on Friday and a new research will be security in network and web management( Intranet and Internet).

*Intranet: A privately maintained computer network that can be accessed only by authorized persons, especially members or employees of the organization that owns it.

                An intranet is a private network that uses internet protocols, network connectivity, and possibly the public telecommunication system to securely share part of an organization's information or operations with its employees.

Advantages of an intranet:

           1. Workforce productivity: Intranets can help employees to quickly find and view information and applications relevant to their roles and responsibilities. Via a simple-to-use web browser interface, users can access data held in any database the organization wants to make available, anytime and - subject to security provisions - from anywhere, increasing employees' ability to perform their jobs faster, more accurately, and with confidence that they have the right information.

           2. Time: With intranets, organizations can make more information available to employees on a "pull" basis (ie: employees can link to relevant information at a time which suits them) rather than being deluged indiscriminately by emails.

           3. Communication: Intranets can serve as powerful tools for communication within an organization, vertically and horizontally.

　

*Internet:

The Internet, or simply the Net, is the worldwide system of interconnected computer networks which makes information stored on it accessible. This information is transmitted by packet switching using a standardized Internet Protocol (IP) and many other protocols. It is made up of thousands of smaller commercial, academic, domestic and government networks. It carries various information and services, such as electronic mail, online chat, and the interlinked web pages and other documents of the World Wide Web.

History Of Internet:

              1. Early beginnings: Spyglass Mosaic.  Internet Explorer is derived from Spyglass Mosaic. Originally, Spyglass licensed the technology and trademarks from NCSA for producing their own web browser but never used any of the NCSA Mosaic source code.

              2. Second stage: browser wars.   Version 4, released in October 1997, was shipped with Windows 98 and was modified to integrate more closely with Microsoft Windows. In September 1998, Microsoft released version 5 of Internet Explorer. Bi-directional text, ruby text and direct XML/XSL support were included in this release, along with enhanced support for CSS Level 1 and 2.

Version 6 was released with Windows XP in October 25, 2001. It mainly focused on privacy and security features, as they had become customer priorities. Microsoft implemented tools that support P3P, a technology under development by the W3C.

               3. Third stage: major development ceased. 

In a May 7, 2003 Microsoft online chat, Brian Countryman, Internet Explorer Program Manager, declared that on Microsoft Windows, Internet Explorer will cease to be distributed separately from the operating system (IE 6 being the last standalone version) [5]; it will, however, be continued as a part of the evolution of the operating system, with IE updates coming bundled in OS upgrades. Thus, IE and Windows will be kept more in sync: it will be less likely that people will use a relatively old version of IE on a newer version of Windows, and newer versions of IE will not be usable without an OS upgrade.

　

How do you search the best way to go somewhere on Internet?

       Example: from NYC to Binghamton

       In the preliminary search we have discovered that it takes three and half hours to cover the journey.

How many different algorithms on the map? There is a lot of ways to get to Binghamton.

*What is Algorithm?

In mathematics and computer science an algorithm (the word is derived from the name of the Persian mathematician Al-Khwarizmi) is a finite set of well-defined instructions for accomplishing some task which, given an initial state, will terminate in a corresponding recognizable end-state (contrast with heuristic). Algorithms can be implemented by computer programs, although often in restricted forms; mistakes in implementation and limitations of the computer can prevent a computer program from correctly executing its intended algorithm.
　

Different algorithms may complete the same task with a different set of instructions in more or less time, space, or effort than others. For example, given two different recipes for making potato salad, one may have peel the potato before boil the potato while the other presents the steps in the reverse order, yet they both call for these steps to be repeated for all potatoes and end when the potato salad is ready to be eaten.

　

Another math example for algorithms:

                    1+2+3+4+5+´´+97+98+100=?

We do not need to add one by one because it is very troublesome and boring.  Simply add 1 and 100(N+1), and then times 100(N), We get twice size of the result.  Therefore we divide it by 2.--------- 5050

Formula: (n+1)*n/2

　

Ok, that is today's journal.  I will get some rest and be ready for tomorrow's quiz.  Wish me lucky!!