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In this paper, we propose a collaborative query system on large-scale relational data available on multiple nodes in several data centers. This mechanism has a special query engine which can access data across all the nodes. We design and implement a process which is suitable to query tasks characteristics, to ensure efficient implementation of these tasks. The system uses direct data transfer between...
In the application of ultrasonic flowmeter, flow measurement has a low accuracy, since the length of straight pipe near the ultrasonic sensor is insufficient, especially the presence of the upstream disturbance. In this paper, in order to analyze the inherent relationship between the measurement error and the characteristics of flow field, two flow diagnostic criterions are proposed: asymmetry index...
In this paper, a binary relation on fuzzy ellipsoid number space is defined. Its properties are investigated and shown to be a weak order on the space. Then, specific calculation formulas of the weak order are obtained for some specific fuzzy ellipsoid number spaces. A practical example is given to demonstrate the application of the weak order in ranking uncertain or imprecise multidimensional digital...
Spatial modulation (SM) is a spatial multiplexing scheme that utilizes both the signal constellation and antenna index to convey information. In the original SM, traditional modulation schemes such as quadrature amplitude modulation (QAM) are employed for constellation mapping. In this paper, we propose a novel scheme where superposition coded modulation (SCM) is employed to modulate the information...
This research devises an index system of evaluating iron and steel enterprise customer satisfaction on the basis of summarizing customer satisfaction theories, in view of current characteristics of the iron and steel enterprises in China and by means of adopting indices to customer satisfaction evaluation. An iron and steel enterprise customer satisfaction evaluation model based on unascertained theory...
Based on two periods Landsat TM data, GIS and the statistical methods, basic data about landscape pattern of the study area were obtained from 1997 to 2006. According to the basic data, the dynamic changing of landscape pattern was quantified in recent 10 years by the dynamic analysis of spatial-temporal variation of patches number and areas, landscape pattern indexes and the transformation matrix...
Interpretative Structural Modeling (ISM) is an effective approach to analyze the complex system structure. The adjacency matrix represents the relations between and among system elements and the system digraph can be drawn by deduction of the reachability matrix. The adjacency matrix is usually built by experts' experience. Because the process does not take the corresponding data of system elements...
Packet classification is one of the most critical techniques in many network devices such as firewall, IDS and IPS, etc. In order to meet the performance requirement for high speed Internet (even higher than 10 Gbps), practical algorithms must keep better spatial and temporal performance. Moreover, as the size of rule set is increasing to tens of thousands, novel packet classification algorithms must...
WTO regulations have deeply influenced Chinese custom reform and the progress of automotive industry. Compared with others, the special automobile industry is influenced more but attracts little attention. Many methods can be used to measure the efficiency of companies, among which DEA-based Malmquist productivity index is the one that can measure the productivity change over different periods. Furthermore,...
Nano-scale HRI liquid crystal (LC) coatings are evenly smeared along long period gratings (LPGs). Experimental results show that the transition between cladding modes and overlay modes occurs when the refractive index of the LC layer is changed from 1.477 to 1.515 by increasing temperature. The sensitivity enhancement to HRI in the transition region is approximately 6 times the sensitivity outside...
A long period grating is eroded. Experimental results show that resonant wavelength shift of can be enhanced by choosing thinner cladding radius and higher order cladding mode. Analysis is given to explain the principle.
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