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khakshour-bazkhaneh--negar
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Investigating the Effect of Personal and Behavioral Characteristics of Intercity Bus Drivers on the Number of Accidents
, M.Sc. Thesis Sharif University of Technology ; Nassiri, Habibollah (Supervisor)
Abstract
Traffic accidents are one of the most important challenges that menaced public health in the world. The research results show that the human factor is one of the most important factors in the occurrence of accidents, and the need to further investigate this factor seems necessary. Buses are the main means of intercity transportation in the country, many passengers use this method of transportation every day. according to the results, buses have the most impact on road accidents, also due to the large number of passengers, they have the most impact on the number of fatalities. The purpose of this research is to investigate the effect of individual and behavioral characteristics on the number...
Design and Construction of Highly Stable pulsed Electrro-opticaly Q-Switched Nd:YAG Laser
, M.Sc. Thesis Sharif University of Technology ; Sadighi Bonabi, Rasoul (Supervisor)
Abstract
Nd:YAG laser is one of the most applicable lasers on laser researches where it’s basic wavelength and higher harmonics are used on different laser projects. It should be realized that it’s basic output has a wide pulse duration and lower peak power. Therefore, in order to increase the peak power the pulse duration is reduced by Q-switching.
In this project, in the first step, based on flash-lamp pump Nd:YAG laser a 600 mj energy per 60 µs pulse is constructed. Then a pulse duration is shorten by order of more than 3000 via electro-optics Q-switching system where we could reach up to 19 ns pulses and laser peak power is increased up to several megawatts
In this project, in the first step, based on flash-lamp pump Nd:YAG laser a 600 mj energy per 60 µs pulse is constructed. Then a pulse duration is shorten by order of more than 3000 via electro-optics Q-switching system where we could reach up to 19 ns pulses and laser peak power is increased up to several megawatts
An I/O Cache Architecture in Open-Channel Solid-State Drives
, M.Sc. Thesis Sharif University of Technology ; Asadi, Hossein (Supervisor) ; Sarbazi Azad, Hamid (Supervisor)
Abstract
Despite low time intervals between requests in many real-world workloads, the flash chip utilization remains very low, leaving the storage device mostly idle. This affects the performance of flash chips in Solid-State Drives (SSDs) and directly correlates with the diminished operational efficiency of these storage devices. Recent studies involve statistical analyses and workload behaviour modelling to maintain the operational efficiency of SSDs. However, due to the unavailability and non-disclosure of the internal control unit structure of conventional SSDs, namely Flash Translation Layer (FTL), the underlying assumptions of these methodologies are deviating from practical realities....