Data access control is an effective way to ensure the data security in the cloud. Due to data outsourcing and untrusted cloud servers, the data access control becomes a challenging issue in cloud storage systems. Ciphertext-Policy Attribute-based Encryption (CP-ABE), as a promising technique for access control of encrypted data, is very suitable for access control in cloud storage systems due t...

This paper presents our efforts in the updating of the Storm Water (SW) Database using Global Positioning System (GPS), direct survey and measurements of the Storm Water structures (or called Manhole) in GIS database management. The main task assignments include (1) Designing a data structure, which becomes an effective geodatabase structure to represent the storm water structures and the corre...

living in satisfying urban environments is important for an individual’s well-being. in order to create such environments, planners, designers, and policy makers need to understand the structures that cause residents to feel satisfied with their environments. this paper focuses on the perceived quality of urban residential environments: dwellings and neighborhoods. first, literature review was ...

In the present paper we propose an unsupervised attribute ranking method based on evaluating the quality of clustering that each attribute produces by partitioning the data into subsets according to its values. We use the Minimum Description Length (MDL) principle to evaluate the quality of clustering and describe an algorithm for attribute ranking and a related clustering algorithm. Both algor...

This paper introduces object-oriented attribute grammars. These can be characterized as a notation for all classes of attribute grammars. Based on a subtype relation between grammar rules, inheritance of attributes and attribute computations are defined. With this approach, attributes local to grammar rules and the elimination of chain rules are possible without any special constructs. We prese...

Cloud storage enables users to remotely store their data and enjoy the on-demand high quality cloud applications without the burden of local hardware and software management. Though the benefits are clear, such a service is also relinquishing users’ physical possession of their outsourced data, which inevitably poses new security risks towards the correctness of the data in cloud. In order to a...

Software variability modeling is a complex task. To manage this complexity, we introduce an approach called Svamp. The main contribution of Svamp is to model concepts through ontologies and offer tool support for capturing functional and quality variability in software product family architectures. Variability description languages are defined by different ontologies that provide meta-models. F...

One of the biggest risks in software requirements engineering is the risk of overemphasizing one quality attribute requirement (e.g., performance) at the expense of others at least as important (e.g., evolvability and portability). This paper describes an exploratory knowledge-based tool for identifying potential conflicts among quality attributes early in the software/system life cycle. The Qu...

introduction: acceptance test is a necessary procedure after spect system installation. the goal of this test is to reveal system's present condition, to compare it with manufacturer's specifications and also as a base for later tests. methods: this study investigated four spect systems in tehran. all of the quality control tests are performed on the basis of nema and iaea recommendations and b...

This paper corresponds to the results of an experimental research that led design a useful prototype for quality control measurements in field tonometry diagnose and check glaucoma. All techniques are based on Goldmann ́s tonometers (GT) Imbert-Fick principle. Taking into account principles industrial metrology, could be used as standard calibrate pressure readings this class tonometers. The dev...