one of the main problems in the efficiency and efficacy of an organization is its structural issue. organizational culture is also considered as an effective factor in the performance of many organizations. the main goal of the present study was to determine the relationship of centralization and organizational culture and performance indexes in teaching hospitals affiliated to tehran universit...

Search engines and database systems both play important roles as we store and organize ever increasing amounts of information and still require the information to be easily accessible. Research on these two types of systems has traditionally been partitioned into two fields, information retrieval and databases, and the integration of these two fields has been a popular research topic. Rather th...

The solution of continuous and discrete-time Markovian models is still challenging mainly when we model large complex systems, for example, to obtain performance indexes of parallel and distributed systems. However, iterative numerical algorithms, even well-fitted to a multidimensional structured representation of Markov chains, still face the state space explosion problem. Discrete-event simul...

We develop asset pricing models' implications for portfolio efficiency when there is conditioning information in the form of a set of lagged instruments. A model of expected returns identifies a portfolio that should be minimum variance efficient with respect to the conditioning information. Our framework refines previous tests of portfolio efficiency by using a given set of conditioning inform...

The establishment of specific and thoroughly researched criteria to evaluate hospitals’ activity is very important because there is a huge and increasing amount of public resources dedicated to healthcare. Therefore, it is necessary to design a system to evaluate healthcare performance in order to discover and improve potential inefficiencies. With this goal in mind, the purpose of this paper i...

As the efficiency measuring and analyzing is a crucial problem in modern enterprise management, this paper focuses on the problem of small and medium enterprise financing efficiency analyzing, and we proposed an improved DEA model based on stepwise regression to tackle this problem. Data envelopment analysis technology can calculate the efficiency of each decision making unit relative. Hence, D...

Under the background of a new round of power market reform, realizing the goals of energy saving and emission reduction, reducing the coal consumption and ensuring the sustainable development are the key issues for thermal power industry. With the biggest economy and energy consumption scales in the world, China should promote the energy efficiency of thermal power industry to solve these probl...

We study strategies of approximate pattern matching that exploit bidirectional text indexes, extending and generalizing ideas of [6]. We introduce a formalism, called search schemes, to specify search strategies of this type, then develop a probabilistic measure for the efficiency of a search scheme, prove several combinatorial results on efficient search schemes, and finally, provide experimen...