Sharif Digital Repository

In recent years, dialogue generation systems as a branch of natural language text generation have made significant progress. These systems enable human-machine conversations and based on their application, they’re divided into two categories: the goal-oriented, and the open-domain dialogue systems. A goal-oriented dialogue is based on a specific goal, such as the hotel reservation or the product recommendation, while there is no specific topic or goal in the open-domain conversations. This wide coverage of topics in open-domain systems causes some occasional contradictions between utterances. Therefore, preserving dialogue consistency has become a challenge in open-domain dialogue systems.... 

This research mainly aims to propose, for the first time, a way of generating text from Abstract Meaning Representation (AMR) in Persian. AMR is a rather new way of representing the meaning of natural language sentences, that captures the various semantic components in a rooted, directed, acyclic graph. Generating text from AMR is a challenging task in natural language processing as some syntactic constructs are abstracted away from the representation, resulting in one single AMR having multiple translations. Considering many applications of generating text from meaning representations in natural language processing it seems inevitable to design some methods for converting such... 

In this investigation the thermodynamic, economic and environmental analysis of a 4rth generation system for simultaneous produce of heat, power, water and cooling of a residential building in Tehran-Iran has been done. Four different system have been used for power generation: 1-combined cycle of Direct Internal Reforming Solid Oxide Fuel Cell and Gas Turbine (IRSOFC-GT) 2-combined cycle of Gas Turbine and Steam Turbine (GT-ST) 3- cycle of Gas Turbine with Recuperator (GT-R) 4- cycle of Steam Turbine (ST). A double effect absorption chiller has utilized to provide the cooling load of the building, while a heat exchanger provides its thermal requirement. Also a MED-TVC system was used to... 

Nowdays, distributed generation (DG) systems based on renewable energy sources have significantly increased around the world as an alternative solution to enhance the power quality and reliability and reduce the need for extensive transmission system as well. An evolved recent concept called microgrid is developed by grouping a cluster of loads and DG units in a common local area which increases the integaration of sustainable energy generation systems. This thesis presents control of a medium voltage (MV) microgrid considering multi-hybrid distributed generation systems (MHGS) and renewable energy resources in island mode. The first part is focused on the development a control strategy for... 

In this research a special Three-Phase to Single-Phase converter has been proposed to connect a three-phase Permanent Magnet Synchronous Generator (PMSG) of a wind turbine to a single-phase network. Common back-to-back converter used for this application employs a bulk capacitor in its DC link to generate the pulsating component of the single-phase side instantaneous power. This capacitor is costly and reduces system overall reliability. This problem is alleviated in this work by providing the single-phase load pulsating power using the PMSG large inductances. The proposed system leaves the PMSG torque ripple-free while providing the single-phase load power. With the help of this method,... 

Abstract: This thesis focuses on generating text from data. The Data-to-Text system must have three capabilities; First, it should be able to produce coherent, comprehensible, fluent text that is close to human natural language, in such a way that it is not possible to distinguish it from texts written by humans. Second, to be able to produce a variety of sentences to express the same concept. The third is to be able to express the information of the input data without repetition, redundancy, and omission in the output sentences. The latter is one of the main challenges of data-to-text systems because not being faithful to the input data can lead to se- rious problems in real-world... 

This thesis focuses on generating text from data. The Data-to-Text system must have three capabilities; First, it should be able to produce coherent, comprehensible, fluent text that is close to human natural language, in such a way that it is not possible to distinguish it from texts written by humans. Second, to be able to produce a variety of sentences to express the same concept. The third is to be able to express the information of the input data without repetition, redundancy, and omission in the output sentences. The latter is one of the main challenges of data-to-text systems because not being faithful to the input data can lead to se- rious problems in real-world applications. Until... 

Natural language generation is one of the burgeoning areas of Nautural Langauge Processing/Computational Linguistics in which the primary concern is to automatically generate sentences in human languages. Based on the type of the input they receive, NLG systems can be divided into two categories: text-to-text and data-to-text. Systems of the first type are usually a part of machine translation systems. The latter type, which is the subject of the current research, deals with language generation based on inputs other than raw text, such as databases, images, videos, audio and so on. This project is an attempt to create an image-to-text system. This is the first research on data-to-text NLG... 

LOOP accident is one of the most important accidents in NPPS and it leads to loss of power supply of the RCP pumps which are the main pumps of primary circuit. Subsequently trip of the rector occurs. In safety analysis, concerning worst conditions, assumes that after a small period of time, main generator of plant stops working and loss of AC power supply of all power plant loads including safety systems ocures. To control of this accident, it’s necessary to startup and load backup power supply system (EDGs) for at least one safety channels, if not, the accident moves forwards and becomes S.B.O accident which is more important accident that ends to core damage because of stops working of all...