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User experience and satisfaction of Web services and service chain are majorly determined by the quality of services (QoS), which is critical to services selection. Geo-data services and processing services are two fundamental services types of geo-services, where geo-data services provide geo-data, and processing services process and produce data. Therefore, the data quality of geo-data provided...
Geographic information service has been becoming the mainstream to provide GIS functions to users more conveniently. There are many geographic information services available among which some may have similar data and functions, thus how to choose the most proper and efficient one becomes the very problem. In recent years, more and more attention has been paid to the quality of geographic information...
Notice of Violation of IEEE Publication Principles"Numerical Modelling of the Environment Impact of Landfill Leachate Leakage on Groundwater Quality--A Field Application",by Shao-Gang Dong, Zhong-Hua Tang, Bai-Wei Liu, O.D. Oroduin the Proceeedings of the 2009 International Conference on Environmental Science and Information Application Technology, ESIAT 09, pp. 565-568After careful and...
The spread of pathogen particles emitting from the windows of infective patient room is studied by Lagrangian-Eulerian approach, hi this model, the continuous phase wind flow is simulated by the three-dimensional Reynolds-averaged Navier-Stokes equations coupled with RNG k - epsiv turbulence model and the dispersed phase pathogen particles are traced by Lagrangian model. The dispersed phase is injected...
The unsteady development of pathogens in a room with infective patients is simulated by the non-linear population dynamic model of virus infection. Assuming the indoor pathogen emitting outside from windows, the emitting pathogens are taken as a source for simulating the transmission of pathogen around buildings with airflow. The three-dimensional Reynolds-averaged Navier-Stokes equations coupled...
Based on the ZigBee wireless network, a park lighting control and child location tracking system is designed in this paper. Considering that there may be a number of children that needs to be tracked concurrently, distributed localization is needed, so an improved RSSI-based algorithm is introduced in this paper. As a goal of our system, the new method, unlike commercial digital-hardware-block based...
The YNvd transformer, which is one kind of three-phase three-winding balance transformer and has several properties, can be used in traction power supply system of electric railway. The strict relation of the primary and secondary in the electric transformation is derived with the impedance matching coefficient. The grounding conditions for YNvd transformer's neutral point and the characteristics...
The modern urban railway traction power supply system is a hybrid AC/DC system. The equivalent 24-pulse rectification is obtained by parallel connection of two 12-pulse uncontrolled rectifiers with 15deg phase shifted. Take 12-pulse uncontrolled rectifier as investigated subject, the operation modes as load current increasing is analyzed in this paper. Rectifier is depicted as a nonlinear electrical...
Cognitive radio technology is used to improve spectrum efficiency by having the cognitive radios act as secondary users to access primary frequency bands when they are not currently being used. In general conditions, cognitive secondary users are mobile nodes powered by battery and consuming power is one of the most important problem that facing cognitive networks; therefore, the power consumption...
According to the basic idea of fluid-solid coupling theory, combining percolation mechanics with rock-soil mechanics and considering threshold pressure gradient and fluid-solid coupling character of low permeability reservoirs, a numerical model is established, which can describe the fluid-solid coupling character in saturated deformable low permeability reservoirs and can be solved by coupling numerical...
Similarity-based collaborative filtering systems are vulnerable to the data sparsity, cold-start, and robustness problems. Computational trust models are promising alternative solutions to alleviate these problems by replacing similarity metric with trust metric. However, they often have some shortages that rely on users' explicit trust statements. A fine-grained model computing trust from user ratings...
Resource constraints make it considerably difficult to implement and optimize cryptography algorithms on sensor nodes. In order to provide guidelines for design, it is necessary to predict overheads of these algorithms without final implementations and optimizations. In this paper, a mathematical model based on overheads of basic operations frequently used in cryptography algorithms is presented for...
The paper presents an improved single neuron-based adaptive PI controller (SNPI) designed for regulating a heating, ventilation and air-conditioning (HVAC) system in a test room, which can be represented by a First-order-plus-dead-time (FOPDT) model. The characteristics including nonlinear and time-varying dynamics in HVAC systems have been considered. By using an improved learning algorithm, which...
Floorplanning is becoming more and more important in VLSI design flows, especially for system-on-chip (SoC) designs where IP blocks dominate standard cells. Moreover, in deep sub-micron technologies, where process variations can introduce extra signal skew, it is desirable to have floorplans with balanced net delays to increase the safety margins of the design. In this paper, we investigate the properties...
The task of evaluation for students' learning achievement needs to consider several aspects about students' learning performance such as practices, examinations, and observations. Traditionally, such evaluation usually calculates a final score by means of weighted average method after awards numerical scores, and then determines a grade according to a set of crisp established criteria. However, this...
This paper considers a circular high-density WSNs, which is divided into several homogeneous sectors. For a sector, the route nodes transmit data to base station (BS) along the sides of the sector and the radio of nodes can cover all areas of target area. The paper presents an energy-balance solution to balance the energy consumption, by adjusting transmission range with quality coverage under a FSCTA...
A capillary pumped loop (CPL) for the cooling of electronic apparatus was presented, and its operation principle and characteristics were analysed. This paper has pointed out the driving mechanism of the interface which is from phase change of fluid in Capillary Pumped Loop (CPL) and Loop Heat Pipe (LHP). A mathematical model has been developed to describe the driving mechanism. According to the theoretical...
Global warming and energy shortage are mankind's greatest challenge in the recent years. The solution to this urgent crisis lies in replacing fossil fuel with renewable energy. One of the most attractive types of renewable energy is solar cell technology, and it is already being deployed around the world. Among many type of solar cells, thin film amorphous silicon (a-Si) solar cell is one of the candidate...
Fingerprint classification is an important indexing method for any large scale fingerprint recognition system or database as a method for reducing the number of fingerprints that need to be searched. Fingerprints are generally classified into broad categories based on global features. This paper describes a new fingerprint classification algorithm that uses some curve features of ridgelines. The algorithm...
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