Progressive queries (PQ) are a new type of query emerged from numerous data intensive applications. A user formulates a PQ in several steps using a set of inter-related step-queries (SQ). Efficiently processing PQs in a DBMS is crucial in supporting these applications. In our previous work, we introduced a materialized view based approach to efficiently processing PQs, where our focus was on se...

The notion of informativeness in information science will be analyzed from a theoretical and empirical point of view and related to the concepts of relevance and information quality.

The issue of business process design for a complex web service provision is gaining attention and has been addressed in a number of recent works. We argue that calculation of global quality of service and protection, which then is negotiated with a client as service and protection level agreements, for complex web services must be based on business process. The quality of service in web service...

For extended enterprises, value-chain integration means that enterprise business systems can no longer be confined to internal processes, applications, and data repositories. What this means for data warehouses, is that their interoperation is a prerequisite in collaborative environments such as Business-to-Business exchanges where they are physically scattered along the value chain. Adopting s...

In recognition of the expanding role of the web as a channel of conducting business, vast investments in web technologies have been witnessed. Using web technologies and their applications enables firms reaching more customers, trading with customers and offering them a smooth purchase transaction. However, firms cannot realize returns on their investments, unless they are offering superior web...

Live P2P streaming has been widely used in recent years because of its scalability and low costs. At the same time, it meets some new challenges that centralized systems never faced, for example, churn and content pollution. It is the first paper which uses stochastic activity networks (SANs) to model and analyze pushbased live P2P streaming systems from the users’ point of view. The model prov...

This paper attempts to determine the relationship between quality and productivity in the hospitality sector. Although both variables are crucial to the competitive and value creation processes in hotels, few empirical studies have explicitly analyzed the relationship between them. Thus, we estimated a production function for a hotel sample that shows how a set of determinants influences labour...

Received Jan 12, 2017 Revised Mar 14, 2017 Accepted Jun 11, 2017 Software quality is a key for the success in the business of information and technology. Hence, before be marketed, it needs the software quality measurement to fulfill the user requirements. Some methods of the software quality analysis have been tested in a different perspective, and we have presented the software method in the ...

In this paper, a renewable energy integration facility (REIF) with photovoltaic (PV) distributed generation resources for micro-grid applications is studied. In grid-tied operation, the PV system together with the grid supply the power to the local loads while the surplus energy is fed back to the grid. In stand-alone mode, a gas micro-turbine is operated as a master to establish the common AC ...

Users' involvement in a sofhvare process is one of strategies for achieving an improvement of software quality. The described research is refen-ed to the software system applied in civil engineering. The continual feedback from users makes possible to learn the user's point of view and to improve a product just according to her/his notes and expectations. The applied method based on a questionn...