Noise emission of universal motor drives

Flexural and transverse vibrations from static and dynamic components of tensioning forces in belt driven systems can cause changes in the noise radiation from the universal motors of clothes washers. This study describes a successful effort to analyze the effect of tensioning forces on noise emission of the drive system. The data show that principal parameters of tensile forces can cause parametric excitation of transverse and flexural vibrations resulting in a considerable change in the noise emissions of universal motors. Using the correlations for validation and recovery of distorted vibration and acoustic data, optimum tensioning forces, hence quieter operation of the universal motor, can be achieved     

Malicious code detection in android: the role of sequence characteristics and disassembling methods

The acceptance and widespread use of the Android operating system drew the attention of both legitimate developers and malware authors, which resulted in a significant number of benign and malicious applications available on various online markets. Since the signature-based methods fall short for detecting malicious software effectively considering the vast number of applications, machine learning techniques in this field have also become widespread. In this context, stating the acquired accuracy values in the contingency tables in malware detection studies has become a popular and efficient method and enabled researchers to evaluate their methodologies comparatively. In this study, we wanted to investigate and emphasize the factors that may affect the accuracy values of the models managed by researchers, particularly the disassembly method and the input data characteristics. Firstly, we developed a model that tackles the malware detection problem from a Natural Language Processing (NLP) perspective using Long Short-Term Memory (LSTM). Then, we experimented with different base units (instruction, basic block, method, and class) and representations of source code obtained from three commonly used disassembling tools (JEB, IDA, and Apktool) and examined the results. Our findings exhibit that the disassembly method and different input representations affect the model results. More specifically, the datasets collected by the Apktool achieved better results compared to the other two disassemblers.