Библиографическое описание:

Семахин А. М. Network Modelling of Corporate Information System // Молодой ученый. — 2012. — №6. — С. 79-82.

Creation of corporate information system demands performance of great volumes of works with high probability of observance of the set terms of realization and precise coordination of interaction of executors [1, p.506]. Effective way of representation and management of a complex of the interconnected works are methods of network planning and management [2, p.271].

Let's lead network modelling and optimization of the network schedule of creation of corporate information system for the District Compulsory Medical Insurance Fund of Kurgan region.

The list of carried out works is presented in table 1.

Table 1

The list of carried out works on perfection of the District Compulsory Medical Insurance Fund of Kurgan region.

Number of the subitem

The Code of work

The Maintenance of work

1

1 - 2

Development of the technical project

2

1 – 3

Development of the contract design

3

2 – 3

The Coordination of the technical project with the contract design

4

2 – 4

The Statement of the technical project

5

3 – 4

The Statement of the contract design

6

4 – 5

Inspection and the analysis of office buildings the District Compulsory Medical Insurance Fund of Kurgan region in Kurgan

7

4 – 6

Inspection and the analysis of office buildings in regional departments (managements) of the District Compulsory Medical Insurance Fund of Kurgan region

8

5 – 7

Carrying out of a spadework in the District Compulsory Medical Insurance Fund of Kurgan region in Kurgan

9

6 – 7

Carrying out of a spadework in regional departments (managements) in the District Compulsory Medical Insurance Fund of Kurgan region

10

7 - 8

Development of structure of a corporate computer network

11

8 - 9

The Choice and a substantiation of network architecture of a corporate computer network

12

9 - 10

The Choice satellite Internet the provider

13

10 - 11

Purchase of computer facilities, the network equipment

14

10 - 12

Purchase of the satellite equipment

15

10 - 13

Purchase of the system, network and applied software

16

11 - 14

Delivery of computer facilities, the network equipment in the District Compulsory Medical Insurance Fund of Kurgan region in Kurgan

17

11 - 15

Delivery of computer facilities, the network equipment in regional departments (managements) of the District Compulsory Medical Insurance Fund of Kurgan region

18

12 - 14

Delivery of the satellite equipment in the District Compulsory Medical Insurance Fund of Kurgan region

19

12 - 15

Delivery of the satellite equipment in regional departments (managements) of the District Compulsory Medical Insurance Fund of Kurgan region

20

13 – 14

Delivery of the system, network and applied software in the District Compulsory Medical Insurance Fund of Kurgan region

21

13 – 15

Delivery of the system, network and applied software in regional departments (managements)

22

14 – 16

Installation of a corporate computer network in Kurgan

23

14 – 17

Installation of the satellite equipment in Kurgan

24

15 – 18

Installation of a corporate computer network in regional departments (managements) of the District Compulsory Medical Insurance Fund of Kurgan region

25

15 – 19

Installation of the satellite equipment in regional departments (managements) of the District Compulsory Medical Insurance Fund of Kurgan region

26

16 – 20

Connection of the network equipment in the District Compulsory Medical Insurance Fund of Kurgan region in Kurgan

27

17 - 20

Connection of the satellite equipment in the District Compulsory Medical Insurance Fund of Kurgan region in Kurgan

28

18 – 21

Connection of a corporate computer network in regional departments (managements) of the the District Compulsory Medical Insurance Fund of Kurgan region in Kurgan

29

19 - 21

Connection of the satellite equipment in regional departments (managements) of the the District Compulsory Medical Insurance Fund of Kurgan region in Kurgan

30

20 – 22

Installation of the software in the the District Compulsory Medical Insurance Fund of Kurgan region in Kurgan

31

21 – 23

Installation of the software in regional departments (managements) of the District Compulsory Medical Insurance Fund of Kurgan region

32

22 – 24

Adjustment of the equipment in the District Compulsory Medical Insurance Fund of Kurgan region in Kurgan

33

23 – 24

Adjustment of the equipment in regional departments (managements) of the District Compulsory Medical Insurance Fund of Kurgan region

34

24 – 25

Training the personnel

35

24 – 26

Testing of a corporate computer network

36

25 – 27

The Passing examinations personnel of the District Compulsory Medical Insurance Fund of Kurgan region

37

26 - 27

Reception in operation of corporate information system


The network schedule of creation of corporate information system for the District Compulsory Medical Insurance Fund of Kurgan region with critical path is shown in figure 1.

The length of a critical path and topology are defined by a method of a critical path. Early term of fulfilment of event j is defined under the formula

, where

- early term of fulfillment of ivent;

- duration of performance of work.

Late term of approach of event is defined under the formula

, where

- late term of fulfillment of event.

Time of end of works of 89 days, total cost of 297 man-days.

Optimization of the network schedule improves the organization of manufacture of works in view of terms of performance, reduces length of a critical way and is spent due to reduction of duration of the works which are being on a critical way, use of reserves of time of noncritical works, insertion of additional resources to critical works. For example, work 1 - 3. New duration 4 days.

Increase in cost at 0,5 man-days. Time of end of 88 days. Total cost of 297,5 man-days.

The first critical path:

12346789101215182123242527.

The second critical path:

1346789101215182123242527.

In volume 0,5 man-days it is necessary to involve additional means in performance of work 1 - 3 which will be executed for 4 days. It will lead to reduction of the general term of performance of the project with 89 till 88 days. The general expenses for performance of the project will make 297,5 man-days. Result of optimization of the network schedule of perfection of corporate information system for the District Compulsory Medical Insurance Fund of Kurgan region: time of completion of works of 66 days, total cost of 329 man-days.

The network schedule of creation of corporate information system for the District Compulsory Medical Insurance Fund of Kurgan region after optimization with critical path is shown in figure 2.



Fig.1 The Network schedule of creation of corporate information system with critical path for the District Compulsory Medical Insurance Fund of Kurgan region.




Fig. 2 Network schedule of creation of corporate information system with critical path for the District Compulsory Medical Insurance Fund of Kurgan region after optimization.



In conditions of uncertainty time is a random variable, submitting to the law of distribution of a random variable (-distribution, normal distribution). Numerical characteristics of a random variable are population mean, dispersion and standard deviation.

The analysis of network schedules method PERT includes calculation of time parameters and an estimation of probability of that the general term of performance of the project will not exceed directive term .

Time of end of 89,3337 days, dispersion 5,055556. A critical way

1346789101215182123242527.

For performance of works on creation of corporate information system for the District Compulsory Medical Insurance Fund of Kurgan region with a high degree of reliability directive time should be days (probability of performance of works 0,88219> 0,85). Total cost of works of 296 man-days.

As a result of network modelling creation of corporate information system for the District Compulsory Medical Insurance Fund of Kurgan region the network schedule of performance of works is developed, the length of a critical path and topology are certain, optimization of the network schedule is lead, time parameters in conditions of uncertainty are calculated and the likelihood analysis of the network schedule is lead, allowing effectively to plan and perform works on creation of corporate information system with the least expenses and in the set terms.


References:

1. Broido V.L.Computing system, networks and telecommunications. Textbook – SPb.: Peter, 2005. - 703 p.

2. G. P. Formin. Mathematical Methods And Models In Commercial Activities.: Textbook – M.: Finansy I Statistika, 2001. – 544 p.

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