Sharif Digital Repository

In this study, damage detection of brick masonry walls using a unique signal processing technique has been addressed. Firstly, the pushover analysis and the calibration of the model is performed. Then, the dynamic analysis of the wall under earthquake excitation in three cases with different aspect ratios is conducted. Finally the dynamic properties of the system, namely natural frequency and modal damping ratio, are identified using continuous wavelet transform. The advantage of wavelet transform is its fine time-frequency resolution. The Morlet mother wavelet is used since it can provide the best time-frequency resolution based on Heisenberg uncertainty principle. Afterwards, the... 

Data Stream is a sequence of continuous data which in recent years, its management and processing is widely introduced in different research areas of computer science such as distributed systems. Although clustering single data stream systems have many usages, the emergence of systems and applications that their main equirement is clustering of multiple data stream that increases rapidly and reveals the need for further research in this area.Sources that are generating data stream have limited memory and processing power.On the other hand, we need information about the entire data stream and require that the information sends to a central site to produce the final result of data mining. As a...