A search engine composed of

- a spider (a bot) search through out the Internet. In the web page you write, you can add some code to indicate that you do not want to be INDEXED.

- catalogues and stores the information into a huge database

- a program to access search requests and returns search result.

In writing web pages, you can add some code inside your web page, inform the search engine not to index your page. They may still searching your web with spider, but not shown as search result.

Skills of searching

- provide more specific information (P.258-259 of text book)

General search: e.g. http://www.google.com

specific search : e.g. http://scholar.google.com.hk/ search scholarly paper (academic)

Many information on the Internet is unverified, incomplete and unreliable . 

The search result from different search engine site vary greatly.

Try to search '8964' or '佔中' in the following search engine

Censorship in China

Especially in social media, please don't forward unverified information. A lot of message forward recently are found to be fake.

Compression ration is high.

e-commerce covers business activities on the Internet

e-commerce model

- B2B  (Business to Business) 

- B2C  (Business to Consumer)

- C2C  (Consumer to Consumer)

   usually buy and sell items through an auction process  ebay or yahoo!Auction

transaction must be encrypted.

Components in B2C e-commerce

- Categories of products

- Shopping Cart, usually stores as cookies in your computer.

- Electronic payment: Credit card, paypal etc.

Electronic payment:

- 2 factors of authentication.

     - possession factor - thing you own (security device)

     - knowledge factor - things you know (password)

    - inherent factor (e.g. bio-metric measure)

Payment method

- third party payment platform. (Paypal, Octopus ...)

Lots of new payment method.

Advantages and disadvantages for e-commerce (refer to p.289)

- pay government bills

- book public facilities or appointment

- reserve, renew return date of books,  read e-books in library (http://www.hkpl.gov.hk)

One stop portal

Advantage and limitation of using e-government (P.293)

e-learning: learn by using computer, mobile device (Tablets/ mobile phone), Internet, e-mails, discussion forum and other learning software.

web based learning:

- content delivery (lecture notes, video etc)

- content developing system

- network community of learners. (Discussion forum, peer assessment via Internet)

Features of e-learning (P.294)

Impacts on teaching and learning.

MOOC (Massive Open Online course) http://www.coursera.org 

Platform for e-learning 

   Paid platform: eclassrooom in eclass

   Open sources platform: Moodle, you have to install a server. e.g. http://comp.rhs.edu.hk/moodle/

   Web based platform: Google Classroom, Edmodo (https://rhss.edmodo.com)

- may free for installation, needs to spend money in progress.

- connected with social media.

Web site or mobile apps

Internet TV (e.g. HKTV)

Internet Radio (e.g. rthk) 

Music Web site

Film web site (watching movie via web or mobile apps)

Newspaper web site and online magazine. 

Portal

Live Broadcast / Webcast: One to Many. The packets from the server sent to many user.

Video conference between multiple location: Many to Many

Social media also help distributing news.

Lower set up cost for an online newspaper.

customize news feeding. 

Benefits and limitation (P.297)

- may not censored. It can be an advantage and disadvantage.

TVB are famous of self censorship in recent student demonstration news.

Internet provides lots of information about the demonstration or from your friends.

Internet addiction disorder - Addiction to Internet and online games.

(P.298)

Information flow is fast - the age of big data. 

Monitoring of human activities. lack of privacy.

Lot of new services in Internet

IT Infrastructure needed to be protect.