All categories

3 years ago

What is wireless?

Computers and Technology

1 answer:

lions [1.4K]3 years ago

7 0

Answer:

The correct option is;

A method of connecting computers using radio signals instead of physical wires

Explanation:

Wireless is the term used to describe a network connection between two or more devices, such as computers, mobile phones and routers, that make use of a radio signal system instead of physical wires for data connection between the nodes in the network

It enables the avoidance of the necessary cost involved in the process installing physical network wires in a premise

The three basic types are Wireless Wide Area Network, WAN, Wireless Local Area Network, WLAN, and Wireless Personal Area Network WPAN.

You might be interested in

Which company provides a crowdsourcing platform for corporate research and development?

777dan777 [17]

Answer:

OA.

MTurk(mechanical turk)

Explanation:

Mechanical Turk is a Microwork service provided by Amazon. Correct answer: C It is an online “crowdsourcing” marketplace that was launched in 2005 by Amazon.

This site (service) allows businesses and individuals to post short tasks and pay workers to complete them.

6 0

3 years ago

What is theory of knowledge?

Karolina [17]

Theory of knowledge (TOK) plays a special role in the International Baccalaureate® (IB) Diploma Programme (DP), by providing an opportunity for students to reflect on the nature of knowledge, and on how we know what we claim to know.

4 0

3 years ago

Accenture has put together a coalition of several ecosystem partners to implement the principles of blockchain and Multi-party S

Anika [276]

Answer:

They include;

1. MAAG Pump Systems,

2. Automatik Plastics Machinery,

3. Gala Industries,

4. Reduction Engineering Scheer,

5. Ettlinger Kunststoffmaschinen and

6. XanTec EDV- und Steuerungstechnik

Explanation:

The MAAG group consists of six companies specialized in different aspects of polymer production. They provide their services to petrochemical, pharmaceutical and food production companies. They produce pellets, gear pumps, filtration systems and components, pelletizers, etc.

They have more than 1000 staff and their offices are located in about 11 countries of the world.

5 0

3 years ago

[1] Please find all the candidate keys and the primary key (or composite primary key) Candidate Key: _______________________ Pri

AVprozaik [17]

Answer:

Check the explanation

Explanation:

1. The atomic attributes can't be a primary key because the values in the respective attributes should be unique.

So, the size of the primary key should be more than one.

In order to find the candidate key, let the functional dependencies be obtained.

The functional dependencies are :

Emp_ID -> Name, DeptID, Marketing, Salary

Name -> Emp_ID

DeptID -> Emp_ID

Marketing -> Emp_ID

Course_ID -> Course Name

Course_Name -> Course_ID

Date_Completed -> Course_Name

Closure of attribute { Emp_ID, Date_Completed } is { Emp_ID, Date_Completed , Name, DeptID, Marketing, Salary, Course_Name, Course_ID}

Closure of attribute { Name , Date_Completed } is { Name, Date_Completed , Emp_ID , DeptID, Marketing, Salary, Course_Name, Course_ID}

Closure of attribute { DeptID, Date_Completed } is { DeptID, Date_Completed , Emp_ID,, Name, , Marketing, Salary, Course_Name, Course_ID}

Closure of attribute { Marketing, Date_Completed } is { Marketing, Date_Completed , Emp_ID,, Name, DeptID , Salary, Course_Name, Course_ID}.

So, the candidate keys are :

{ Emp_ID, Date_Completed }

{ Name , Date_Completed }

{ DeptID, Date_Completed }

{ Marketing, Date_Completed }

Only one candidate key can be a primary key.

So, the primary key chosen be { Emp_ID, Date_Completed }..

The functional dependencies are :

Emp_ID -> Name, DeptID, Marketing, Salary

Name -> Emp_ID

DeptID -> Emp_ID

Marketing -> Emp_ID

Course_ID -> Course Name

Course_Name -> Course_ID

Date_Completed -> Course_Name

For a relation to be in 2NF, there should be no partial dependencies in the set of functional dependencies.

The first F.D. is

Emp_ID -> Name, DeptID, Marketing, Salary

Here, Emp_ID -> Salary ( decomposition rule ). So, a prime key determining a non-prime key is a partial dependency.

So, a separate table should be made for Emp_ID -> Salary.

The tables are R1(Emp_ID, Name, DeptID, Marketing, Course_ID, Course_Name, Date_Completed)

and R2( Emp_ID , Salary)

The following dependencies violate partial dependency as a prime attribute -> prime attribute :

Name -> Emp_ID

DeptID -> Emp_ID

Marketing -> Emp_ID

The following dependencies violate partial dependency as a non-prime attribute -> non-prime attribute :

Course_ID -> Course Name

Course_Name -> Course_ID

So, no separate tables should be made.

The functional dependency Date_Completed -> Course_Name has a partial dependency as a prime attribute determines a non-prime attribute.

So, a separate table is made.

The final relational schemas that follows 2NF are :

R1(Emp_ID, Name, DeptID, Marketing, Course_ID, Course_Name, Date_Completed)

R2( Emp_ID , Salary)

R3 (Date_Completed, Course_Name, Course_ID)

For a relation to be in 3NF, the functional dependencies should not have any transitive dependencies.

The functional dependencies in R1(Emp_ID, Name, DeptID, Marketing, Date_Completed) is :

Emp_ID -> Name, DeptID, Marketing

This violates the transitive property. So, no table is created.

The functional dependencies in R2 ( Emp_ID , Salary) is :

Emp_ID -> Salary

The functional dependencies in R3 (Date_Completed, Course_Name, Course_ID) are :

Date_Completed -> Course_Name

Course_Name -> Course_ID

Here there is a transitive dependency as a non- prime attribute ( Course_Name ) is determining a non-attribute ( Course_ID ).

So, a separate table is made with the concerned attributes.

The relational schemas which support 3NF re :

R1(Emp_ID, Name, DeptID, Course_ID, Marketing, Date_Completed) with candidate key as Emp_ID.

R2 ( Emp_ID , Salary) with candidate key Emp_ID.

R3 (Date_Completed, Course_Name ) with candidate key Date_Completed.

R4 ( Course_Name, Course_ID ). with candidate keys Course_Name and Course_ID.

6 0

3 years ago

Describe two types of technology your parent(s) or caregivers use to help care for or support you. how do you benefit from this?

mariarad [96]

My parental figures utilize a wide range of sorts of innovation to help bolster me. For instance, I would state an auto is a gigantic piece of tend to a youngster. When I should have been dropped off at school or move my folks had an auto to enable me to arrive. Another case would be kitchen innovation. My mother dependably cooks for my family and that is a basic piece of developing is nourishment. Guardians can find out about new innovation through the Internet and by assets.

5 0

3 years ago