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Nowadays, the artificial freezing method is an important technique to construct in deep alluvium and fracture rock layers. It was needed to develop a highly efficient, highly precise and non-destructive testing method for freezing wall monitoring. Based on the partial difference function of radar waves, the similarity transformation method was used to deduce the relationship between model experiments...
Visual scene system is essential for the ship handing simulator, influencing the reality as well as the result of ship maneuvering training. Three-dimensional database modeling is the foundation and key of the research on visual scene system. This paper discusses the basic methods for three-dimensional visual simulation modeling and the model optimization principles, explains visual database modeling...
According to the characteristic of traffic signs, several color components are used to extract several kinds of traffic signs, which improved the detection efficiency in pre-processing. Then the regions of interest (ROI) are set not only to save process time but also to increase the accuracy of road recognition. Meanwhile the geometric characters of the road signs are represented by morphological...
In this paper, we investigate the energy efficient relay selection scheme for two-way relay network. Two optimal joint relay selection and power minimization schemes are studied. One approach is to minimize the total transmit power, including the relay power and the transceiver power, subject to the signal to noise ratio (SNR) requirements on the two transceiver. And the other focuses on relay power...
In two-hop relay systems, time division duplex (TDD) is usually adopted to support asymmetric traffic and offer channel reciprocity. When a relay is in the amplify-and-forward (AF) mode, the reciprocity is only provided within each hop. The equivalent channel between a base station (BS) and a mobile station (MS) cannot be reciprocal due to the operation at the relay. In some cases, the BS needs the...
Three-hastate vertical axis wind wheel (THVAWW), with higher wind energy utilization, is a new wind power installation. An airflow-collecting cavity is introduced to improve the efficiency of the wheel further based on the invention patent technology of THVAWW. Computational fluid dynamics (CFD) theories and some modeling tools such as Solid works, ICEM and Fluent are used to grasp the dynamic flow-field...
Wind energy has attracted persistent attention all over the world as a renewable energy, so it is very important to research the permanent magnet generator which is an important part of wind energy conversion system. A simplified computational method for generator design is proposed in this paper, and an experimental device is made to check out the usability of the proposed method. The dynamic performance...
Three-hastate vertical axis wind wheel, a novel type rotor with high efficiency, can be able to actualize wind energy conversion by the lumen twice driven principle, based on the theoretical analysis of the rotor's geometric structure in this research. The computational fluid dynamic analyses, which detect the aerodynamic characteristic of the rotor further, are also described by using the multiple...
In this paper, a new type of intelligent high-power ultrasonic power supply based on Digital Signal Processor (DSP) has been developed. According to the characteristic of ultrasonic power supply, the control system software has been programmed. It deals mainly with the drift of the slow frequency for the resonance frequency search module in whole and the frequency automatic tracking module deals with...
In cooperative MIMO relay systems, when amplify-and-forward (AF) mode is used, the equivalent channel from source station (SS) to destination station (DS) can be seen as a simple MIMO channel. When singular value decomposition (SVD) based precoding is used in the system, the equivalent channel can be decomposed into several parallel non-interfering subchannels. It is showed that some of the singular...
Relay aided wireless transmission realizes extended coverage and increases capacity for wireless communication networks, especially for the TDD/FDD LTE-A system. The relay node processes the received signal from source under certain rules and forwards the signal to destination. Amplify-and-Forward (AF) and Decode-and-Forward (DF) are two of the conventional relay schemes commonly used and cited. Estimate-and-Forward...
This paper focuses on transmit precoding for multiuser MIMO downlink systems. In multiuser MIMO systems, multiuser interference (MUI) and noise are two well-known factors with respect to the system's performance. Block diagonalization (BD) method is proposed to completely eliminate MUI by placing the intended users in the nullspace of all the unintended users. But the BD method imposes a condition...
In this paper, we evaluate the existing transmission schemes in multi-cell environment, such as single-cell transmission with Inter-cell interference (ICI) as well as Collaborative Multi-Point transmission/reception (CoMP) technique in LTE-A, and propose an more effective solution to deal with the inter-cell interference. The proposed transmission structure takes advantage of the cooperation between...
This paper introduces the basic components of submersible temperature logger system and the relationships between the various modules. According to the principle of low power, a Single Chip Microcomputer with idle mode and stop mode is necessary. Through the analysis of the temperature measurement and the data storage, the optimal strategy for power management can be found. For the purpose of energy-saving,...
Our work addresses the problem of analyzing and understanding dynamic video scenes. A two-level motion pattern mining approach is proposed. At the first level, single-agent motion patterns are modeled as distributions over pixel-based features. At the second level, interaction patterns are modeled as distributions over single-agent motion patterns. Both patterns are shared among video clips. Compared...
In this paper, joint optimization of subcarrier pairing, relay selection and power allocation is formulated through a capacity maximization problem in orthogonal frequency division multiplexing (OFDM) relay systems, with fairness considerations and individual power constraint on each node. Because achieving the optimal solution is computationally demanding, which is resulted from the excessive possibilities...
With the rapid increase in expressway mileage, accidents and casualties are increasing frequently. Expressway construction in China starts later than developed countries and lack of mature and comprehensive emergency rescue systems. There are some limitations in accident rescue process and information processing such as low coordination level between multi departments and low level of information...
A certain area complicated formation condition was taken as engineering research background. Dynamic effect coefficient was introduced to analyze moving loads of railway subgrade. Under the conditions of goaf and fault, the movement and deformation laws are analyzed by numerical simulation using software RFPA2D when high-speed train goes across. Four different railway location plans were chosen to...
The global shortest path programming (GSPP) has extensive applications in engineering practices. The Steiner tree problem is a nonlinear programming conundrum with fixed points and fictive points and is typical theoretical basis of GSPP. The Steiner minimum tree (SMT) problem can be changed to a combination-optimization problem, a test selection algorithm for the construction of the initial population...
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