### What is Dicom?

#### Dicom is ...

A computing utility that allows instant computation at your desktop. It is a new kind of calculator that can calculate with units.

#### What it does?

Dicom calculates, converts and computes. The first ever computing tool that deals with dimensions of physical quantities in mathematical expression, Dicom, has the answer to expression like: 30 mi./h.+6 ft./s.+15.24 m./s. to ft./s. Dicom can evaluate expressions anywhere in a rich text formatted document. It has a built-in rich text editor.

Dicom can meet your calculation needs, be it simple, scientific, financial, mathematical, statistical, or you name it. Process your words, numbers, and measurements at one place.
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#### So, Dicom is more than just Calculator?

Yes, conventional software based calculator usually simulates the real calculators. Dicom has a calculator which is very different. It is rather an expression evaluator. And probably for the first time, you can evaluate dimensional expression. It has a unit converter too. That allows you to quickly convert from one unit to another. And as stated already, it has a built in rich text editor that can process texts as well as dimensional expressions.
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#### What is dimensional expression?

6*5/3+2-1 is a mathematical expression, for example. This expression is dimension-less. The result of the expression is 11. But it is just a number and does not represent any physical quantity like length, mass, time, etc., unless you explicitly mention what it represents.

On the other hand, 30 mi./h.+6 ft./s.+15.24 m./s. is another mathematical expression which has got dimensions of physical quantities. In this expression mi.,h., ft., s., and m., are mile, hour, feet, second, and meter respectively that represent either length or time. Thus each term of the expression has two dimensions, length and time. In combination they represent the speed or velocity of something. You can express the result of a dimensional expression to another consistent or homogeneous unit. To express the result in ft./s., for example, you need to write following expression in dicom:

30 mi./h.+6 ft./s.+15.24 m./s. to ft./s.

Dicom will happily respond to that, giving you the result, which is of course 100 ft./s.
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#### How many dimensions Dicom can deal with?

There are seven base quantities, assumed to be mutually independent, on which the International System of Unit (SI) is founded. Following table describes these base units.

Table: SI Base Units

 No. Base quantity Name Symbol 1 length meter m 2 mass kilogram kg 3 time second s 4 electric current ampere A 5 thermodynamic temperature kelvin K 6 amount of substance mole mol 7 luminous intensity candela cd

In addition there are two SI supplementary units (so-called dimension less derived unit): the radian, the SI unit of the quantity plane angle; and the steradian, the SI unit of the quantity solid angle. Supplementary units are as follows:

Table: SI Supplementary Units

Dicom deals with all these independent units or dimensions plus another special unit for currency. A total of 10 dimensions, that Dicom can consider to evaluate an expression.

Table: Dicom Special Unit for Currency
 No. Base quantity Name Symbol 10 currency us dollar USD

Although, Dicom can recognize around 90 physical quantities and 650 units, it is not limited to this set. User can easily add new physical quantity and unit to the Dicom database. Once added to the database, user-defined units can be used exactly like Dicom factory-defined units in a dimensional expression.
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Dicom document is rich text formatted (RTF) file, which is portable across many applications and platforms. Dicom document, however, is not meant to be a word processed file, there are already robust software to do that business of word processing. In a Dicom document you can write your formatted text and expression together which form the Dicom Input Document. Later you can process the file to evaluate the expressions within the document. Dicom will generate a corresponding Output Document.
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#### What are the Applications of Dicom?

Dicom can be useful in many areas, especially in science and engineering. Besides the need of quick calculation or unit conversion, some possible applications of Dicom can be, design verification, quick estimates, surveying, laboratory calculation, research, student's work sheet, etc. If you find Dicom is helpful in your area, the Author would be pleased to know about that along with your comments and suggestions.
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