Sharif Digital Repository

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 recent years, heterogeneous architectures have been widely used in digital system design, so that these heterogeneous platforms are employed to achieve low power consumption, high performance, and high reliability. In other words, heterogeneous multi-core systems are promising solutions to provide a wide range of possibilities in compromising the low power/energy consumption, high reliability, and high performance. Most heterogeneous systems have several different islands (in terms of core types, supply voltage, and frequency) that each of them consists of several homogeneous cores. Due to the heterogeneity, the values of power consumption, and reliability of the tasks are differentt,... 

Technology scaling allows integrating multiple cores onto a single chip to make the mainstream for advanced embedded systems. However, technology scaling results in aggravating the reliability problem of on-chip systems because of increasing transient fault rate due to lower voltages and shrinking transistor dimensions that lead to smaller critical charges. Multicore systems provide a great opportunity to implement reliability mechanisms such as redundant multithreading (RMT) and process level redundancy. Task replication (e.g., RMT) is a well-established technique to achieve high reliability against transient faults. However, replicated executions may increase power consumption beyond the... 

Technology scaling allows integrating multiple cores onto a single chip to make the mainstream for advanced embedded systems. However, technology scaling is envisaged to aggravate the reliability of on-chip systems due to increasing transient fault rate due to lower voltages and shrinking transistor dimensions that lead to smaller critical charges. Transient faults are typically resulted due to high-energy particle strikes in hardware and manifest as bit flips. Multi-core systems provide a great opportunity to implement reliability mechanisms such as redundant multithreading (RMT) and process level redundancy. Task replication (e.g. RMT) is a well-established technique to achieve high... 

Nd:YAG laser is one of the most applicable laser for researches and development where it's basic wavelength and harmonics are used on different laser project. It's basic output has a wide pulse duration and low peak power ,therefore in order to increase the peak power the pulse duration is reduced by Q-switching.In this project by means of passive Q-switch technique an energy equivalent to 500 mj with 10to 20 ns pulse duration is extracted from the oscillator and the output energy is amplified to about 850mj in a single pass through amplifier. In this project we used saturable absorber for Q-switching because it is more optimum and simpler than other Q-switching techniques like... 

Mixed-Criticality Systems (MCSs) include tasks that have multiple levels of criticality and they operate in dierent modes. These systems bring benets such as energy and resource cost saving. However, there are challenges in how to manage available resources in order to achieve high utilization, low power consumption, and required reliability. In many cases, these goals are in conict with each other. For example, if ermal Design Power (TDP) was a constraint on the power consumption of the chip, an approach that increases the utilization, unaware of power consumption, can oversteps TDP and leads to permanent or transient faults. Hence aging balancing and task re-execution are utilized to...