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Saturday, 18 July 2015

University Final Year Dissertation Project Summary

The purpose of the Web-based Tool for Interactive Visual Summary Generation of Geographical Data project is to design and build an interactive geographical map online platform prototype for exploring statistical trends in the 2011 UK census data. The ASIGM (Attribute Signature Interactive Geographical Map) prototype platform delivers this through the use of multiple visualisation techniques and methods, for example Attribute Signature Charts, which allow the census data to be visualised and geographically explored.


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Thursday, 22 January 2015

Unlimited Register Machine (URM) Example

The goal of this URM is to calculate the function: i + (2*j) + k and place the result in R4, where for example i = 2, j = 3 and k = 7. So the function is now 2 + (2*3) + 7

URM Program:

Z (4)
  1. J (3, 4, 6)
  2. S (1)
  3. S (2)
  4. S (4)
  5. J (1, 1, 1)
  6. J (2, 4, 10)
  7. S (1)
  8. S (4)
  9. J (1, 1, 6) 
  10. J (1, 3, 14)
  11. S (3)
  12. S (4)
  13. J (1, 1, 10)


The following points are observation about the above program.
  • The program uses registers R1, R2, R3 and R4
  • If r3 = r4, the first instruction involves a jump to instruction 6
  • If r2 = r4, the third instruction involves a jump to instruction 10
  • If r1 = r3, the fifth instruction involves a jump to instruction 14
  • The instructions 5 involves jumping back to the first instruction if r1 = r1 and so, as this is always true, the effect of this instruction is the unconditional jump “go to instruction number 1”. This also applies for instructions 9 and 13.
  • The overall effect of the first and third, the fourth and sixth and the seventh and tenth instructions is that the program includes 3 ‘do while r3 ≠ r4, r2 ≠ r4 and r1 ≠ r3’ loops.

Illustration of URM transaction:



Instructions
R1
R2
R3
R4

2
3
7
0
1
2
3
7
0
2
3
3
7
0
3
3
4
7
0
4
3
4
7
1
5
3
4
7
1
1
3
4
7
1
2
4
4
7
1
3
4
5
7
1
4
4
5
7
2
5
4
5
7
2
1
4
5
7
2
2
5
5
7
2
3
5
6
7
2
4
5
6
7
3
5
5
6
7
3
1
5
6
7
3
2
6
6
7
3
3
6
7
7
3
4
6
7
7
4
5
6
7
7
4
1
6
7
7
4
2
7
7
7
4
3
7
8
7
4
4
7
8
7
5
5
7
8
7
5
1
7
8
7
5
2
8
8
7
5
3
8
9
7
5
4
8
9
7
6
5
8
9
7
6
1
8
9
7
6
2
9
9
7
6
3
9
10
7
6
4
9
10
7
7
5
9
10
7
7
6
9
10
7
7
7
10
10
7
7
8
10
10
7
8
9
10
10
7
8
6
10
10
7
8
7
11
10
7
8
8
11
10
7
9
9
11
10
7
9
6
11
10
7
9
7
12
10
7
9
8
12
10
7
10
9
12
10
7
10
10
12
10
7
10
11
12
10
8
10
12
12
10
8
11
13
12
10
8
11
10
12
10
8
11
11
12
10
9
11
12
12
10
9
12
13
12
10
9
12
10
12
10
9
12
11
12
10
10
12
12
12
10
10
13
13
12
10
10
13
10
12
10
10
13
11
12
10
11
14
12
12
10
11
14
13
12
10
11
14
10
12
10
11
14
11
12
10
12
14
12
12
10
12
15
13
12
10
12
15
STOP
12
10
12
15

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