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The traditional MAC protocol in ad hoc networks includes carrier sensing to judge the busy/idle state of a channel. However, in airborne tactical networks, the results of carrier sensing are usually inaccurate due to the wide distribution of nodes, large communication distance, and high-dynamic network topology, and the carrier sensing causes a large transmission delay and low channel utilization...
For high resolution spaceborne SAR system, the errors caused by straight trajectory assumption and stop-go approximation cannot be ignored. In this paper, an algorithm is proposed to compensate the above errors. First, a novel modified hyperbolic range equation (MHRE) is introduced to describe the satellite's orbit which is more precise than the traditional hyperbolic range equation (THRE). Then,...
With a continual increase in air aviation turnover and passenger numbers, the airline industry in China has significant opportunities and challenges, namely an increasing market demand and rising costs. In this paper, we first structurally divide Chinese airline costs into controllable and the uncontrollable costs, and then determine that the controllable costs are primarily related to aviation fuel...
In early 2013, Beijing and even the whole country of china appeared the haze weather and PM2.5 problem, environmental problems caused widespread attention again. The latest research of "Atmospheric haze tracking and control" special group of CAS results that: coal and motor vehicles are the main cause of the strong fog haze weather. For China, the coal is the primary energy in China accounted...
Background Radiofrequency ablation is a promising minimal invasive treatment for tumor. However, water loss due to evaporation has been a major issue blocking further RF energy transmission and correspondently eliminating the therapeutic outcome of the treatment. Method A 2D symmetric cylindrical mathematical model coupling the transport of the electrical current, heat, and the evaporation process...
In this paper, we establish VAR model to study the issue of household energy consumption (HEC) in China with status quo analysis of that from 1980 to 2009. Firstly, based on the previous literature of domestic and foreign, the main factors affecting HEC are derived. Besides, result from testing suggests that consuming capacity, population and structure are the leading power to determine HEC. Further,...
Web services make tools which used to be merely accessible to the specialist available to all, and permitting previous manual data processing and analysis tasks to be automated. One of key problem is Web services composition in terms of Quality of Service (QoS). There are many task concurrencies, such as remote sensing image processing, in computation-intensive scientific applications. However, existing...
Spatial data balancing distribution can evidently improve the performance of parallel spatial database in shared nothing parallel architecture. Considering spatial locality and unstructured variable length characteristics of spatial data, this paper proposes a dynamic spatial data balancing distribution method under shared nothing parallel database environment. By using Hilbert ordering code to keep...
Knowledge of customer reservation price aids manager in implementing many marketing strategies such as dynamic pricing, bundling sales, and target promotion etc. This paper investigated how cognition factors affected different customer segment's reservation price distribution. Utility of information products usually can not be quantitatively measured like that of physical products, and contrarily,...
Result integrating is a key component for keyword querying across heterogeneous databases. Once the results from various search engines are collected, the search engine merges them into a single ranked list. In this paper, firstly, we present a novel model of searching, which the database is an undirected graph and results are modeled as answer trees that match individual keywords in the query. Secondly,...
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