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The 7th International Symposium on Intelligent Data Analysis

Fuzzy Logic Based Gait Classification for Hemiplegic Patients

author: Ahmet Yardimci, Akdeniz University

Description

In this study a fuzzy logic classification system was used first to discriminate healthy subjects from patients rather than classifying those using Brunnstrom stages. Decision making was performed in two stages: feature extraction of gait signals and the fuzzy logic classification system which is used Tsukamato-type inference method. According to our signal feature extraction studies, we focused on temporal events and symetrical features of gait signal. Developed system has six inputs while four of them for temporal features evaluation rule block and two of them symmetrical features evaluation rule block. Our simulation test results showed that proposed system classify correctly 100% of subjects as patient and healthy elderly. The correlation coefficient was found 0.85 for classification to subjects to correct Brunnstrom stages. The results show that classifying patients becomes increasingly difficult linearly according to hemiplegia’s severity.

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Slides
0:00 Fuzzy Logic Based Gait Classification for Hemiplegic Patients
0:18 Stroke I
1:53 Stroke II
2:03 Study
3:19 Software
3:36 Data Gathering
4:27 Statistics about Subjects
4:51 What We Do to Reach Our Aims?
5:31 Three Orthogonal Acceleration Signals
5:58 Description of Accelerometer Signal*
6:16 Temporal Events in Stroke Hemiparesis* pt 1
6:40 Temporal Events in Stroke Hemiparesis* pt 2
6:59 Some Measurable Features of Gait
7:05 Some Important Notes from Literature
7:34 Symmetry and Laterality Quantification* pt 1
7:42 Symmetry and Laterality Quantification* pt 2
8:00 To Determine Asymmetries: Symmetry Index (SI)
8:10 Difference between the SI’s in a Sample Problem
8:36 Hemiplegic Gate Signals
8:58 Feature of Signal
9:17 Detection Algorithm*
9:27 Anteroposterior Step times
9:52 Anteroposterior Signal Ranges and Mean Values pt 1
10:02 Anteroposterior Signal Ranges and Mean Values pt 2
10:10 Vertical Acceleration Signals
10:20 Lateral Acceleration Signals
10:23 Comparison of some Features of Vertical Acceleration Signals pt 1
10:28 Comparison of some Features of Vertical Acceleration Signals pt 2
10:31 Vertical and Lateral Acceleration Signals Mean Ranges
10:36 Fuzzy Logic Based Classification
11:02 Preferred Features of Acceleration Signals
11:30 System Block Diagram Direct Fuzzy Classifier
11:35 System Structure
11:58 Fuzzy Logic System Diagram
11:59 Membership Functions of 1st Rule Block
12:08 Membership Functions of 2nd and 3rd Rule Blocks
12:09 Rules
12:12 Test (MoM)
12:23 Test Results
12:26 Tests
12:51 Classification Accuracy Assesment pt 1
13:42 Classification Accuracy Assesment pt 2
13:48 PMCC Results
13:57 Statistical Results
14:47 Future Works pt 1
15:03 Future Works pt 2
15:21 Future Works pt 3
15:45 Thank You for Your Attention!

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Reviews and comments:

Comment1 rubini, February 3, 2008 at 7:03 a.m.:

the patient have the stroke in rights side and after he get treatment he have a right knee pain for 2-3 weeks now.can u help me how that problem get it and y that patient get that pain and what treatment is suitable for he.10q


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