**6. Conclusion**

206 Fuzzy Inference System – Theory and Applications

Fig. 5.3. (a) Reduction in cognitive task efficiency as a function of noise level for 'young' age

Fig. 5.3. (b) Reduction in cognitive task efficiency as a function of noise level for 'medium'

Fig. 5.3. (c) Reduction in cognitive task efficiency as a function of noise level for 'old' age for

for various cognitive tasks.

age for various cognitive tasks.

various cognitive tasks.

The main thrust for the present work has been to develop a neuro-fuzzy model for the prediction of cognitive task efficiency as a function of noise level, cognitive task type and age. It is evident from the graph that the cognitive task efficiency, for the same cognitive task, depends to a large extent upon the noise level and age. It has also been verified that young age are slightly affected even at medium noise level while old ages get significantly affected at much lower noise level. It is to be appreciated that the training done using ANFIS is computationally very efficient as the desired RMSE value is obtained in very less number of epochs. Moreover, minor changes are observed in the shape of the membership functions after training the model. This is because of close agreement between the knowledge provided by expert and input/output data pairs.The present effort also establishes the usefulness of the fuzzy technique in studying the ergonomic environmental problems where the cause-effect relationships are inherently fuzzy in nature.

#### **6.1 Scope for future research**


Some Studies on Noise and Its Effects on Industrial/Cognitive Task Performance and Modeling 209

DISAGREE NEUTRAL AGREE STRONGLY

A B C D E

A B C D E

A B C D E

A B C D E

A B C D E

A B C D E

A B C D E

A B C D E

A B C D E

A B C D E

A B C D E

A B C D E

AGREE

**7.2 Appendix-B** 

4. Easy to learning new

5. you like repetitive nature

6. You are creative thinking

8. Care for time span of activities and

development nature of

9. Don't Have a lot of say

10. You are free to take own decision while working

11. You are not continual dependence on others

12. You are not affected by influence over organization change

13. You are not affected by influence of a policies of

14. You are regular meeting of work team

16. You effected are not by influence over work team decision

15. Doesn't Supervising people at your job

things

of work

at work

job

on job

union

1. Noise level dB(A) 2. age years 3. sex M or F

STRONGLY

DISAGREE

7. Your skill is high A B C D E

17. Have a hard work A B C D E 18. Don't Have a fast work A B C D E

