The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The strategy of storage and organization can be adjusted utilizing the access and distribution law of the spatial data, which will significantly improve system performance of spatial data services. The access and distribution law of the spatial data based on Hotmap and Zipf-like are statics, and can not reflect its global information real-time. A dynamic statistical method based on collaborative cloud...
We have developed a high-resolution penetrating radar to measure glacial ice thickness. With an operating frequency band of 100–150 MHz, this radar can provide a range resolution of less than 2 m in ice. The radar is designed to measure ice sheet thickness up to 3000 m. The system uses pulse compression and coherent integration techniques to obtain a high processing gain. A high-speed Direct Digital...
The paper presents a three-dimensional localization algorithm for Wireless Sensor Networks (WSN) based on Particle Swarm Optimization (PSO). According to a direct proportion relationship of the measured distance with the measuring errors, an improved three-dimensional localization objective function is defined with weighted the measured distance, and which is optimized by using PSO. In the process...
The financial crisis of 2007 to the present highlights the importance of banks operating risk management, while screening mechanism is a key issue for banks risk control within an innovative supply chain finance (SCF). From the angle of commercial banks, this paper explores the interior mechanism of SCF and then uses fuzzy synthetic evaluation method, combining with meta-graphs to make a tentative...
Standing at the whole socio-economic level where the construction projects locate, this thesis took the construction projects as a compounding system of natural-social-economic and researched the apply of project management in sustainable development. First, from the respect of management object, project attribute, management goal, management organization and so on, it has compared the project management...
As a newly developing mode, BT mode is not a way of project contracting but a mode of investment and financing. The adoption of BT mode facilitates the development of urban infrastructure, and brings in economic benefits for the enterprise. But the lack of legal basis arose new problems, therefore the project management and analysis of financing risk under BT mode will be the key to bringing BT mode...
A new efficient parallel wavelet algorithm was presented in order to speed up wavelet transform in three-dimensional surface texture analysis. It is based NVIDIA's CUDA (Compute Unified Device Architecture), a new general purpose parallel programming model and instruction set architecture that leverage computational problems on GPU more efficient than CPU. Compared with CPU, GPU has evolved into a...
For the moving target detection with space-time adaptive processing (STAP), the non- homogeneity will cause the covariance matrix estimation error, which substantially results in the STAP performance degradation. Diagonal loading has long been used as a means to improve the robustness of the spatial filter against mismatches in both the desired spatial signature and the spatial correlation matrix...
This paper presents a method for the process planning of prismatic part, where the machining operations of a manufacturing feature can be done by different machine, set-ups, and tools. The optimization objective is to minimize the total cost which includes the Preparing Cost and the Machining Cost. Here, process planning is modeled as a constraint-based traveling salesman problem (TSP), and an ant...
For the pattern synthesis method of the arbitrary array antenna with the linearly constraint minimum variance criterion (LCMV-PS), the primary disadvantage is its poor adaptability, namely its performance is determined by the iterative coefficient. In order to improve its performance, the effect of the relative amplitude between synthesis pattern and its reference upon the pattern synthesis is considered...
To multi-objective decision-making problems of Enterprise project investment, this paper analyzed the issues in project decision, considered the factors of qualitative and quantitative in the project decision, and combined with the various constraints of the project selection process, then established the objective planning model of enterprise project investment and discussed the application of the...
Based on the item response theory, this paper constructs a web-based adaptive learning system. The system plans learning activities for learners, defines the learning space according to learners' actual situation, tracks learners' ability under the theory of item response, selects adaptively the learning units and realizes the learner-centered learning form characterized by personalization and individualization.
Since 2003, the Chinese government has strengthened controls on the real estate market. However, the academic circle has controversy on the policy effectiveness of real estate regulation. This paper adopts the data envelopment analysis (DEA) model to carry out system analysis to the effects of the real estate regulation policy during 2003–2008, and uses the statistical data to verify the conclusions...
Risk management for general contract project is well experienced task, which must deal with much more qualitative factors that is easy influenced by individuals, so that the objectivity cannot be guaranteed. A novel method is proposed in order to overcome the shortcomings, which use the clustering analysis to evaluate bidding risk. An optimal objective function based clustering model is designed to...
Pilling image segmentation is a key step in the objective evaluation system of fabric pilling level. The traditional methods of pilling segmentation apply to only one or more fabrics. In order to improve the properties of the evaluation system, an algorithm based on edge flow is proposed in this paper. The algorithm makes use of a prediction model to identify the image color or direction change of...
Based on image processing technology, this paper constructs a fabric-pilling evaluation system in which the edge flow method is used to implement pilling segmentation of complex fabrics. Then the system extracts three characteristic parameters: the number of pilling, total area of pilling and optical volume of pilling and describes the relationship between grades. Finally, in the three-dimensional...
We have accomplished a prototype of wide band Coherent ice penetrating radar system which can be used for polar ice depth measurement. The radar uses pulse compression and Coherent integration techniques and works in the VHF band. Using different transmit power, the system can operate in both surface-based and airborne applications. A dual-channel receiver is introduced for better performance on different...
Comprehensive tradeoff control on quality, construction duration, cost and resource equilibrium is main aspect of construction project management, and is significant for improving the benefits of construction projects. In this paper, firstly the time-cost relationship model, the quality-time relationship model and resource equilibrium-time model are set up separately, objectives of quality and resource...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.