E-waste Recycling Center

Today, our lives are almost inseparable from a wide range of electronic products, which has created a huge consumer electronics market.

According to the United International University of Telecommunications, the “Global E-waste Monitoring Report 2017” released by the United Nations University and the International Solid Waste Association in December last year, 44.7 million tons of electronic waste was generated worldwide last year, of which only 1/5 was recycled. Experts predict that global e-waste will reach 52.2 million tons by 2021, and this growth trend may continue for several decades.

Unfortunately, most of the e-waste is not fully recycled, causing not only serious damage to the environment, but also wastes tens of billions of recyclable materials.

In order to improve the difficulty of recycling e-waste, in addition to raising people’s awareness of environmental protection, more importantly, the technology companies that produce these electronic devices need to take more responsibility.

Creating greater profits, many technology companies have implemented “planned scrapping” of their products, forcing users to replace new products, of which smartphones are the most common.

Another way is to make the product difficult to repair. Last year, the famous maintenance organization iFixit selected the 5 most difficult hardware to be dismantled in 2017. Apple and Microsoft took all the places.

In fact, most of the recovered e-waste can be recycled through technology, but the reality of e-waste recycling is still very serious. ERI (Electronics Recyclers International) is one of the largest e-waste recycling companies in the United States, and its CEO, John Shegerian, said: Responsible recycling of e-waste is a responsibility that a large company should shoulder… We recycle hundreds of millions of pounds of electronics every year. Garbage, the company has recovered more than one billion pounds since its establishment, but this is only a slap in the face.

Transmission System, Packet Switching

Store and forward is a data communication technique in which a message transmitted from a source node is stored at an intermediary device before being forwarded to the destination node.

The store and forward process enables remote hosts, data connectivity and transmission, even if there is no direct connection between the source and destination nodes.

At that point, the telco provider creates a dedicated circuit for that session and connects you to your friend’s telephone. No matter how long you keep the line open with your friend, the circuit will remain, and packets flowing between both telephones will always follow the same path. This is an example of a circuit-switched network.


You pick up your land phone and dial your friend. At that point, the telco provider creates a dedicated circuit for that session and connects you to your friend’s telephone. No matter how long you keep the line open with your friend, the circuit will remain, and packets flowing between both telephones will always follow the same path. This is an example of a circuit-switched network.

switch on your PC and connect to your favorite site that offers a number of applications you can download from, so you begin downloading one application at a time. Each packet has to find its own route to the destination, i.e., your computer. Each packet finds its way using the information it carries, such as the source and destination IP address. If network congestion occurs, the routers responsible for routing packets between networks will automatically select different paths to ensure data is transferred as required. This is an example of a packet-switched network.

Webpage Project: Internet

I choose :Foolish Tech Predition 6

“Apple is already dead.”

Nathan Myhrvold, former Microsoft CTO, 1997

In my mind: In addition to the success of the product, the most important thing is the ecological creation of the product.

As an ecological company, Apple simply said that a product is the most successful, I am afraid it depends on how you define success. If you look at sales, it is undoubtedly the iPhone’s brief description of Apple’s development process, there are some descriptions of the leak, please correct me.

When Jobs returned to Apple for the second time, Apple was on the verge of closing down the unprofitable products and looking for Microsoft to borrow money. Aiming at the market opportunity of mp3, doing hardware iPod, developing iTunes store (finding the record companies, negotiating pricing, obtaining copyright), constitutes the music solution and the ecological support of the iPod profit, continue to develop hardware pc, software Mac os .

Developed the hardware iPhone, first used the iTunes store around the iPhone, built the app store (open api, perfect programming language, attract developers, come to the platform to do software for users), built the book store, and now the home kit smart home interface Wait, enhance the user’s stickiness to the Apple platform.

Apple won’t die, at least for the next ten years.

It is too convenient to use Apple devices.

introduce the world of ASCII and Unicode.

  1. What’s the difference between ASCCII and Unicode?

Ascii stands for American Standard code for information interchange. It uses 8-bit encoding.

Difference: Unicode is also a character encoding but uses variable bit encoding.

Ascii represents 128 characters.

Difference: Unicode defines 2^21 characters. Unicode is a superset of ASCII. Unicode represents more characters than ASCII.

Ascii is stored as 8- bit byte.

Difference : Unicode is stored in byte sequences such as UTF-32 and UTF-8

ASCII is not standardized

Difference: Unicode is standardized.

2. Why would we need Unicode if we aleady had ASCII?

Unicode is needed because it represents a huge number of characters. It is the superset of ASCII. Hence to represent more number of characters we need Unicode when we already had ASCII which represents only 128 characters.

I post one video :introduce the difference between ASCII and Unicode.

[ video catch from Youtube]

Week 2: Understanding bits

A bit can also be defined as a variable or computed quantity that can have only two possible values. These two values are often interpreted as binary digits and are usually denoted by the Arabic numerical digits 0 and 1.

A bit (short for binary digit) is the smallest unit of data in a computer. A bit has a single binary value, either 0 or 1.

Although computers usually provide instructions that can test and manipulate bits, they generally are designed to store data and execute instructions in bit multiples called bytes.

In most computer systems, there are eight bits in a byte. The value of a bit is usually stored as either above or below a designated level of electrical charge in a single capacitor within a memory device.

Half a byte (four bits) is called a nibble. In some systems, the term octet is used for an eight-bit unit instead of byte. In many systems, four eight-bit bytes or octets form a 32-bit word. In such systems, instruction lengths are sometimes expressed as full-word (32 bits in length) or half-word (16 bits in length).

Intro to the digital world

What is Digital word?

In my mind digital word is the basis for creating digital media.

Digital word can be Ia form of electronic media where data are stored in digital (as opposed to analog) form. It can refer to the technical aspect of storage and transmission (e.g. hard disk drives or computer networking) of information or to the “end product”, such as digital video, augmented reality, digital signage, digital audio, or digital art .