Düşme Tespit Sistemlerinde Aktivite Sınıfı Sayısının Etkisinin Araştırılması

Öz

Bu çalışmada, yaşlı bireyler için geliştirilen düşme tespit sistemlerinde, makine öğrenmesi tabanlı sınıflandırıcılarda sınıf sayısının azaltılmasının doğruluk seviyesine katkısı araştırılmıştır. Çalışma kapsamında internette açık erişime sunulmuş bir veriseti kullanılmış, aktivite ve postür belirlemede sıkça kullanılan öznitelikler çıkarılmış ve MATLAB Machine Learning Framework’de bulunan sınıflandırıcıların tümü kullanılarak en başarılı sınıflandırıcının tahlili makine öğrenmesi metriklerine göre yapılmıştır. Sınıf sayısı kademeli olarak azaltılıp başarıya etkisi incelenmiştir. Başlangıç aşamasında sınıf sayısı azaltılmadan yapılan sınıflandırmada en başarılı sınıflandırıcı olarak Kübik Destek Vektör Makinesi (Cubic SVM)algoritması belirlenmiştir. Bu algoritmayı kullanarak gerçekleştirilen sınıflandırmada başarı % 96,4 olmuştur. Problemin doğasına da uygun olarak literatürdeki çalışmaların aksine sınıf sayısı 2’ye düşürüldüğünde k en yakın komşuluk (KNN) algoritması ile düşmeler %99,3 oranında doğru şekilde belirlenmiştir.

Anahtar Kelimeler

• Düşme Tespit Sistemi
• Makine Öğrenmesi
• İvme Sensörü
• Sınıf Sayısı

Investigating the Impact of Activity Class Number in Fall Detection Systems

Öz

In this study, the contribution of reducing the number of classes in the machine learning based classifiers to the accuracy level of the fall detection systems developed for older individuals is investigated. Within the scope of the study, a public dataset is used and the appropriate data source is determined, the features frequently used in determining the activity and posture are extracted and the analysis of the most successful classifier is made according to the machine learning metrics using all the classifiers in the MATLAB Machine Learning Framework. The number of classes is gradually decreased and its effect on success is examined. The classification carried out with the Cubic Support Vector Machine (Cubic SVM) algorithm, which is determined as the most successful classifier in the classification without reducing the number of classes at the initial stage, is 96.4%. In accordance with the nature of the problem, contrary to the studies in the literature, when the number of classes is reduced to two, the falls are correctly determined by 99.3% by using k nearest neighbor algorithm.

Anahtar Kelimeler

• Fall Detection System
• Machine Learning
• Accelerometer
• Number of Classes

Kaynakça

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