Sharif Digital Repository

The rapid growth of information on the web and the need for information sharing on one hand and also as news plays an important role in our life and internet becomes the biggest repository for keeping this news on the other hand, lead us to research in this domain.
In this thesis, we introduce a new framework for searching news by considering the relation between news and events. This framework called NewsSe. NewsSe considers news as a series of events in order to cover all aspects of news. NewsSe uses Domain Ontology and Event Ontology to extract the concepts and relations existed in news. NewsSe consists of 4 different modules. NewsCr is a crawler which uses a new methodology for... 

Nowadays, in our contemporary societies the social networks and online communities have carved for themselves a crucial niche and unique status. Maintaining and enhancing a core relation between their communities, thus have proven to be a worthy challenge to IT professionals. We have proposed a model for developing and maintaining a cohesive relation between members in social networks and improved their interaction and cooperation via collaboration of different social networks .We focus on the definition and properties of transitivity and semantic attributes ,which explains the relationship between members’ attributes and their membership level in social networks and leading us to provide... 

Communications in organizations have been one of the most important issues. To run the business processes, the company needs communication between units and customers. We provide a tool which can be used as an aid for network designers by guiding them with a framework. The resulting QoS parameters help to provide more alignment between the network and business requirements. The framework contains values for delay, loss and availability as three QoS parameters of the network used in the business process. The organizations business processes are used as a basis for the method which used in the tool. We use UML as the tool to model the business processes in the organization and the process is... 

With the development of social network sites and wide use of Social Networks, information security and confidence of its components, became more and more important and turned into subject of many studies and researches. Relationship based on trust besides increasing productivity reduces risk of information transmission to non-related people. Although in the real world, semantic relations are the main basics for trust, but the existing methods of trusting in current sites have less attention to this point. To reduce such issues, firstly this research is going to use an added semantic understanding on top of the social networks structure. To do so, there is an inference engine in addition to a... 

Web services are some kind of software applications which are available on the Web. Growing the popularity of Web services, led to increasing number of providers and as a result a great deal of Web services. This huge number of services made the searching and discovery tasks hard and effort-full jobs. In order to have a better discovery it is better to first classify Web services into some categories and then search in the relevant class. Although this classification can be done based on matching key words through the service registration information, such syntax-level service facilities can’t achieve the satisfaction results both in the precision and the recall sides. Human experience shows... 

The advent and proliferation of computer networks have dramatically changed computing, communications and more importantly, our daily lives. The global network of computer networks, the Internet, has enabled novel ways of distributed information sharing that were unthinkable just a short decade ago. With invaluable opportunities comes the grand challenge of developing methodologies for collaborative capturing, processing, storage, dissemination and sharing of information. The present work takes an important step toward addressing this grand challenge. In particular, we study and evaluate a novel programming paradigm, referred to as “Distributed Semantic Programming”, in which semantical... 

Networked computers are expanding more and more around the world, and digital social networks becoming of great importance for many people's work and leisure. Emails, Weblogs and Instant Messengers are popular instances of social networks. In this thesis, the main target is to have an advertisement according to user favorites and interests by mining his/her interactions in digital social networks. Briefly, in our method social network users are categorized based on the topics exchanges between them in the network, these topics discovered by mining of flowing data in that environment, considering that these topics shows the user willing, finally relevant advertisements will be represented to... 

In the modern world of software engineering, software evaluation has earned a special position. The presence of consultation companies in evaluating the software will confirm this specialty. Web technology, as a new trend in computer science, has attracted the attention of many researchers and practitioners. As known nowadays, most of the software solutions are Web-based. Such software is technically called Web application. The methods of evaluating Web application include the use of traditional metrics in software engineering. The intelligence of the Web in computer science has been the core of much research.
This study is intended to use intelligence, as one of the new features of the... 

Social network is a map of relationships among individuals or organizations. With the development of social network sites (SNS), security protection of private information online has been a serious and important research topic. Information in social networks is online all the time and available to a large number of visitors. The main problem in current SNSs is that, people are not able to define different categories for their relations and then they cannot have good self-defined privacy policies. Also default policies cannot satisfy different environments and cultures and will serve information to strangers. After that different social networks with different interfaces are not... 

Web service technology is becoming increasingly popular since it is very bene?cial in di?erent types of applications. Due to a dramatical increase in the number of developed web services, the service discovery process has become crucial for using web services e?ciently. Service is an adaptive, self-describing, modular application, which may be used in either web or an internal network. Service providers should o?er the services along with a description ?le called advertisement explaining the speci?cations and functionalities of the service. Traditional service discovery methods are based on syntax and keyword matching, which may not satisfy the requester’s desired requirements and will... 

The picosecond (ps) pulses in a synchronously pumped optical parametric oscillator (SPOPO) is generated by a 20W and 81.1 MHz Yb fiber laser at 1064nm, providing 11.7 W of total average power in near to mid-IR at 73% efficiency so that the signal pulse with a wavelength of 1560 nm and 7.1W average power and 3330 nm idler pulse with an average power of about 4.6W has been produced. The optical parametric oscillator (OPO), based on a 50 mm MgO:PPLN crystal with 5 gratings which is capable of withstanding large average powers without thermal effects.
The duration of these ultrashort infrared signal pulse generated by the described SPOPO is measured by using homemade interferometric... 

In this project , the dissociation of methane in the presence of Ti:Sapphire laser with parameters of 1014wcm-2, 800nm wave lengths and 100fs pulse width have been investigated theoretically, by using the Gaussian03 package –computational chemistry program that is capable of predicting many properties of atomic and molecular systems. It is based upon the fundamental laws of quantum mechanism. By considering some limitations in approximate techniques and incapability of advancing them, numerical calculation of solving the time dependent Schrödinger equation in order to improve the results and find more quantum dynamic information is applied. Therefore at first, by Gaussian03 package some of...