نشریه آرمان پردازش
سال یکم شماره 1 (زمستان 1399)

Requirement extraction is a process for identifying needs and the relationship between separate groups in order to define and receive needs. This process is associated with fundamental challenges that hinder the development of requirements. Underestimating the extraction of requirements may cause very costly problems in the final stages of development and cause the analyst many problems and obstacles in this regard. These problems that underlie the present study can be caused by many factors that recognizing these problems can be avoided during the requirements extraction process.The ability of engineering process requirements in the system, such as methods and tools, to deal with changes are very important factors. In today's complex systems, due to the existence of very large data, communication and flow between them and the Internet of Things, very large systems have been provided, which according to the scale of these systems, validation is one of the final requirements to confirm these requirements. In this study, we have examined the requirements process from the perspective of stakeholders, validation of requirements and also how to operate the system due to its great importance in this area.

Cloud computing is an emerging model of business computing. It distributes computing tasks in shared resource pools, which consist of many computers, so that various applications can access the cloud as they need. In computing, resource contention refers to a conflict over a shared resource between several components. Resource contention often negatively affects the performance of components competing for the resource. It is a common concern in cloud computing. Unmanaged resource contention in cloud computing environments can causes problems such as performance interference, service quality degradation and consequently service agreements violations. Performance management is an indispensable remedy solution for the mentioned challenges. Monolithic analysis and management of the performance from the cloud services perspective and different entities has not been studied in previous researches and most of the previous studies focus on algorithms and methods for specific applications and mostly, lack sufficient descriptions about management aspects of the performance. Due to the importance of this issue, this paper aims to make an in-depth investigation of this problem. In this paper, we propose a novel approach to monolithic management of the performance and its general requirements for clouds. The proposed approach enables service providers to realize different optimization methods and manage the performance for their offers and products. The experimental results demonstrate the effectiveness, flexibility and practicality of the proposed approach for effective performance management in different cloud service centers.

Cloud computing is a leading paradigm in the era of information and communication technology to provide the shared and cost-effective hardware, middleware and software resources and related services. This paradigm is the best model for easy access to set of shared computing resources such as networks, servers, storage devices and so on. Related services are available at any time and place, according to the user's request and users can easily use this services by connecting to a physical or logical server over the Internet. In this research, an attempt is made to examine the important and fundamental dimensions of this paradigm and related details. In this study, we also examined the important solutions of the virtualization technology, which is one of the emerging techniques in the world of information and communication technology, as a basis for building the suitable and cost-effective infrastructures of a cloud environments. Applying virtualization in cloud computing is a knowledge and technique that can be used to overcome many problems and obstacles in the field of emerging information technologies and pave the way for sustainable development and creating the right conditions for business to the best.

Cloud computing is one of the newest and most successful computing technologies in recent years. However, despite the increasing use of cloud computing, it is difficult to take full advantage of its unique potential, due to inherent problems such as quality challenges, lack of shared resources, performance interactions and efficiency. Today, the quality of service for cloud computing is a key factor in improving support for a large number of users. It should be noted that the satisfaction of users in the field of cloud computing and providing the desired level of quality in providing services, are the main factors for the success, progress and development of this paradigm. Therefore, cloud service providers, using different methods and techniques, try to provide the best quality services with different and varied prices to customers. Hence, adopting a proper quality management perspective will attract more customers and higher revenues for cloud providers. This paper focuses on examining quality-oriented cloud computing business models, quality challenges and strategies, as well as comparing the most important perspectives on improving service quality by highlighting the associated advantages and disadvantages. Finally, after describing quality challenges in environments cloud computing introduces suggestions for improving the service quality management in cloud services.