Sharif Digital Repository

The expansion of Cyber-Physical Systems (CPSs) in diverse domains, including automotive, aerospace, and healthcare, has led to increased challenges for these systems in the last decade. With the increasing complexity of the functions performed by these systems, Mixed-Criticality Systems (MCSs) that integrate tasks with different criticality levels have attracted much attention. These systems often have a heterogeneous multiprocessor architecture and use Directed Acyclic Graphs (DAGs) to model task dependencies. This paper proposes a fault-tolerant scheduling algorithm that manages energy consumption and reliability while considering the Deadline Miss Ratio (DMR) in heterogeneous... 

In this dissertation, a vast number of 2D steel IMFs (Intermediate Moment Frames) with various number of stories and bays, each having one soft storey, of various intensities (ordinary soft storey & extreme soft storey), were studied. The frames were loaded according to ASCE SEI-7-16 and were designed based on AISC-360-10. In order to make a storey softer than others, its height was increased with respect to those of other ones. The dynamic ‘nonlinear spectral analysis,’ and two different static approaches, namely those of ‘ASCE/SEI-7-90’ and ‘ASCE/SEI-7-16,’ were used to study the frames. Comparison of the results obtained from the three aforementioned methods, one dynamic and two static... 

In this study, a semi-structured model for the growth and production of lactase in an aerated bioreactor by Kluyveromyces marxianus, growing on cheese whey, was developed. Three modes of culture, consisting of batch, fed-batch and a controlled-release system were investigated. Modeling was based on three metabolic pathways, representing the growth of Kluyveromyces marxianus. Lactose and oxygen consumption, cell growth, and also lactase and ethanol production rates were determined in the model. Induction was considered as the governing mechanism for enzyme production. The model showed good agreement with the experimental data in batch and fed-batch cultures. Controlled-release system is a... 

Providing quality hospital services depends on the efficient and correct implementation of processes. Therapeutic care processes are a set of activities that are carried out with the aim of diagnosing, treating and preventing any disease in order to improve and promote the patient's health. The purpose of this study is to use process mining techniques to discover and improve healthcare processes. The case study of this research is a psychiatric hospital in Shiraz. The approach implemented in this research consists of three main stages including data pre-processing, model discovery phase, and analysis phase. Three algorithms including Heuristic Miner, Inductive Miner, and ILP Miner were used... 

Quantum states are highly susceptible to noise and can lose their coherence easily. Thus, for the large-scale quantum algorithms results to be valid, it is necessary to use an error correction process to eliminate the errors. The theory of quantum error correction provides a comprehensive methodology for protecting quantum states against noise. In this theory, by adding ancilla qubits and carefully encoding, quantum states are prepared such that they can be robust to a great extent against errors. To perform a scalable quantum computation, we face an even more daunting task. If our quantum gates are imperfect, everything we do will add to the error. So the quantum error correction could be... 

Kluyveromyces genus is known to be one of the important yeast used in processes of industrial biotechnology. This importance is due to production of Lactase, key enzyme in dairy industries that catalyses hydrolysis of lactose in milk. But high concentration of carbon source which is lactose in most cases, causes crab-tree effect, a metabolic pathway that leads to more production of ethanol rather than lactase. In this research the main purpose was to control the initial lactose concentration in medium to prevent decrease in enzyme activity. Controlled release system via Ethylene Vinyl Acetate tablets was chosen as a controller mechanism of lactose concentration as EVA was a well-known... 

Partially submerged propellers are new type of propellers which general knowledge regard them is limited. These propellers found a growing market ahead of them and experts expect to use these propellers for big vessels at high speeds. This type of propulsors do not lose their efficiencies at high speeds and are assumed to be economical. Meanwhile, due to continuous hit to the water surface, huge stresses are exerted on the blades which needs to be fundamentally studied. Several researchers have studied the partially submerged propellers which unfortunately did not publish their results. Therefore, it is necessary to study several aspects of partially submerged propellers. Due to growing... 

Risk management, one of the knowledge areas in project management, plays a key role in the success of projects in today’s unstable situation. The massive cost reduction achieved by risk management can manifest its importance even more in huge construction projects in gas and oil industry such as developments of power plants and petrochemical complexes. In this research, the effect of considering the correlation between risks and consequently the effect of risk action plans on other risks in their execution cost reductions has been demonstrated. A questionnaire has been designed, many experts have been interviewed, and using statistical methods, the risks’ interdependencies have been... 

Believing that the strength obtained from the standard 150300 mm2 cylindrical specimens, introduced by the ACI, cannot be a proper representative of what concrete experiences as part of a structure under loading, in this project an attempt was made to develop new methods for testing concrete specimens to find their strength. In order to avoid making new molds and to use standard 150300 mm2 molds, various innovative measures, proposed by the supervisor of this project, were used to work out the strength of tested concretes. While the results obtained from limited number of tests carried out in this work did not show much difference between the results of the standard ACI test with those of... 

In this thesis a novel Fuzzy Fractional Order Controller (FFOPID) is presented. This controller is designed by the means of the combination of a fuzzy system and a fractional order PID. Fractional controllers, especially fractional PIDs, shows their performance in control systems after the advent of fractional calculus. Fractional PID has better flexibility according to the classic PID. As the real control systems are nonlinear actually, so solving the control problem needs a nonlinear controller. Therefore, a fuzzy system is used in this thesis, in order to adapt the controller parameters with different operating points of the system. Fuzzy system design needs the optimal values for... 

For both Fichte and Hegel, self-consciousness is an intersubjective concept; that is, for them, self-consciousness is necessarily constituted between, at least, two subjects. In Foundations of Natural Right, Fichte introduces summons and recognition as necessary conditions of self-consciousness, without which, i.e. an other who is calling upon the subject, the subject cannot be conscious at all. Hegel, in Phenomenology of Spirit, also says self-consciousness is desire which is satisfied only in another (self-) consciousness. Based on these ideas, I try to show that self-consciousness can be defined as having the both in view; the self (I) and the other (not-I), at the same time. In this... 

Hand-launched UAVs are type of unmanned aerial vehicles that due to transportability and geometric specification, are operationally valuable and worthy. reconnaissance & surveillance (aerial mapping, aerial filming, inspection, border protection); health care (blood transport, body organ transport, medicine delivery); agriculture (farm monitoring, fertilization, cloud seeding); payload delivery (envelopes posting); network covering (internet supply, telecommunication relay); crisis management (remote area medical) are some of typical applications and missions of this type of aircrafts. These UAVs have almost low altitude short endurance (below 5000 ft. and less than 2 hrs.). To extend their...