Computer Studies Made Simple : Mesh Topology:

Mesh Topology:

In this network,every device in the nwtwork is connected to every other device.

A message can be sent from source along different possible pathways to the destination.

This topology has enhanced performance and is very reliable.

They are usually used in wide area networks.

Advantages:

This system doesnot slow down in cases of heavy data flow.

It is easy to truble shoot

The system continues to function even if one link becomes non-functional.

Disadvantages:

It is very expensive

It has difficult configuration and installation.  

Dermatology Made Simple : Terms used in Dermatology Part 3

Terms used in Dermatology Part 3

Nummular lesions:

This means con like lesions.

They are usually seen in eczematous lesions of the skin.

Annular lesions:

This term is used to describe ring shaped lesions of the skin.

Excoriation:

This refers to partial or complete loss of epidermis.

Reticulate lesions:

This refrs to lesions who are shaped like a net.

They are seen in Autoimmune conditions usually.

Desquamation:

This refers to peeling off of superficial layers of the skin.

Fissures:

These are slits through whole thickness of the skin.





Plaque



Bullae




Pustule on skin

Computer Studies Made Simple : Tree Topology

Tree Topology

This type of topology has combined features of both bus and star topologies.

It consists of a group of computers configured in a star topology.

These groups are then connected to a backbone bus cable.

Advantages:

It is used for expansion of an existing network.

Disadvantages:

If the bus cable/backbone cable breaks,the entire network fails.

It is more difficult to configure than other topologies.

Dermatology Made Simple : Terminology used for describing lesions of the skin:

Terminology used for describing lesions of the skin:

Ulceration:

This means loss of surface of skin.

This includes the epidermis and dermis.

Pustules:

These are skin lesions that contain pus.

This can be due to bacterial infection or sterile in case of pustular psoriasis.

Atrophy:

This means thinning of the skin.

It occurs due to loss of tissue in epidermis,dermis and subcutaneous fat.

Lichenification

This means thickening of the skin.

It occurs due to long term rubbing on the skin and pressure.   

Computer Studies Made Simple : Ring Topology

Ring Topology

In this network,each computer is connected to the next one forming a ring of computers.

Each computer transmits the data it receices from the previous one.

The flow of data thus is in one direction which is forward from the previous computer.

The data/information passes around the ring till it reaches the correcr destination folder.

Advantages:

1.It is less expensive than star topology.

2.Each computer has equal access to the network.

Disadvantages:

1.Failure of one computer in the ring can affect the entire network.

2.It is more difficult to troubleshoot.

3.Adding or removing computers can affect the entire network.

Ring Topology

Dermatology Made Simple: Changes in Nails Part 2

Changes in Nails  Part 2

Beau Line:

This refers to a partial thickness transverse break in nail plate.

This represents a temporary arrest in nail matrix development process.

It may affect a number of nails.

It can happen during times of illness as well as in association with nail diseases such as eczema and psoriasis.






Longitudinal nail splits:

These may be sinle or multiple.

An single split on nail usually represents an area of focal nail damage.

This canbe due to one of the following causes:

Acute trauma or injury to the nail.

Repeated trauma from external object.

In case there are multiple longitudinal aplits,they canbe due to a generalized inflammatory or degenerative process.

The casues for these include:

Lichen planus

Aging

Darier”s Diseases

Darier"s Disease

Darier"s Disease is characterized by dark crusty patches on the skin, sometimes containing pus. The crusty patches are also known as keratotic papules.

Mild forms of the disease are the most common, consisting solely of skin rashes that flare-up under certain conditions such as high humidity, high stress or tight-fitting clothes. 

Even in mild forms, short stature combined with poorly formed fingernails containing vertical striations are diagnostic.

 

Skin Lesions in Darier"s Disease

Computer Studies Made Simple : Star Network / Topology

Star Network / Topology

In this type of network,all computers are connected with central device which is called as hub.

This type of topology is mostly used in Client Server Models.

In order for a computer to share its data with other computers in the network,it first sends its data to  the hub.

The hub will then subsequently send the data to the other computers/receiving computers.

Thus the hub acts as a central connection point and each computer in a star topology communicates with the central hub.

Advantages:

1.It is easy to find and troubleshoot faults and errors incase one arises in this type of network.

2.Failure of one computer will not cause the entire network to collapse.

3.It Is easy to add or remove computers without disturbing the network.

Disadvantages:

1.If the central hub fails,the entire network will fail.

2.Overall it is  an expensive network.

3.A large amount of cable is neee for connecting the computers.