Advanced Materials Research Vols. 791-793

Abstract: In recent years, using message ferries as mechanical carriers of data has been shown to be an effective way to collect information in wireless sensor networks. Closed Walk Ferry Route Design (CWFRD) problem aims to minimize the average weighted delay of the sensed data to the sink by designing the ferry route as a closed walk which contains more than one simple cycle. In this paper, an improved genetic algorithm is proposed to solve the CWFRD problem. Different to other problems solved by the genetic algorithm, in the CWFRD problem, the ferry may access the sink node more than one time, and then the lengths of the two chromosomes for evolving may be different. The proposed Improved Genetic Algorithm (IGA) can solve this problem, and experimental results show that IGA can greatly reduce the average weighted delay.

Abstract: We present an improved particle-based coupling method of fluid and rigid bodies which consists of fluid-rigid coupling and rigid-rigid coupling. To simulate both rigid-rigid and fluid-rigid coupling process, we compute the pressure and friction forces between rigid boundary particles and fluid particles. Then we discretize them by SPH method and obtain the resultant forces of rigid bodies and fluid. The main advantage of our method is that it does not rely on the surface normal of rigid bodies and not affected by the sampling density on rigid boundary. Combined with collision pretreatment and space divided neighboring research, our method can simulate the fluid and rigid bodies coupling process efficiently, which possesses high fidelity and strong robustness.

Abstract: The use of Principal Component (PC) algorithm is explored for the efficient representation observations from high-resolution infrared sounders for the purposes of data assimilation into numerical weather prediction (NWP) models. A new version of the fast radiative transfer model has been developed that exploits principal component analysis and then implemented into the WRF 4D-Var data assimilation system, thus allow the investigation of the direct assimilation of PC scores from Atmospheric Infrared Sounder (AIRS). Testing of a prototype system where 119 AIRS spectra replaced by only 20 PC scores show significant computational saving with no detectable loss of skill in the resulting analyses or forecasts. The methodologies implemented in this regard are examined and the potential for future increased use of the data are explored.

Abstract: Network security technology-based firewall, intrusion detection, less user behavior from the network point of view to is considered possible vandalism. Net Flow collector for this problem, the network traffic statistics, the design of said data structures and statistical models of user behavior characteristics, the behavior of specific information, the establishment of the database behavior in a certain period of time granularity; on the basis of the behavior of database the design the clustering mining algorithm applicable to user behavior features, defined from the user behavior, determine the behavior patterns of individual users of the network. The experiments show that the design algorithm can effectively tap the behavior of the user's network, and provide a valid basis for management, analysis of user behavior.

Abstract: To solve the problems on quick achieving reliability and the minimal path sets (MPS) of a system with GO Methodology, a Binary Decision Diagram (BDD) based new GO methodology algorithm is introduced. This technique can avoid the shared signals and combination explosion problems simultaneously. Detailed steps with a case study are presented to explain the analysis procedure of this technique, firstly, establish the GO model and transform it into a directed acyclic diagram (DAG), logic tree and BDD successively; then minimize the BDD according to the Without Rule; at last, this system reliability and MPS can be achieved. The results of the studied case verify the validity and effectiveness of this algorithm.

Abstract: Ocean wave have a magnetic field disturbance, caused by the motional induction of sea water moving in the steady main field of Earth. Mass experiment indicates ocean wave-generated magnetic field disturbance can be a major limitation on the performance of airborne magnetic anomaly detection. To check the character of such disturbance observed above sea-surface, a harmonic ocean wave-generated magnetic field disturbance mathematical model based on Weavers monochromatic wave-generated magnetic field model and ocean wave directional spectrum is proposed. Algorithm is presented for real-time simulation of ocean wave-generated magnetic field disturbance corresponding to the proposed mathematical model. Numerical simulations of ocean wave-generated magnetic field disturbance are sampled above sea-surface by a stationary magnetometer and an airborne magnetometer moving steadily along a rectilinear path. Spectrum analysis of the samples is performed. Simulations results indicate that the proposed harmonic ocean wave magnetic field disturbance mathematical model can well-simulate the real sea conditions. Numerical simulations also reveal that there is a Doppler frequency shift with the increase of magnetometer flight speed. Moreover, energy of the magnetic field disturbance is more dispersed and frequency band is wider with the increase of magnetometer flight speed.

Abstract: The inverse problem is an important interdisciplinary subject, which receives more and more attention in the fields of mathematics, computer science, information science and other applied natural sciences in recent years. Nowadays, the inverse problem is more and more commonly applied than before, e.g., in image processing and geophysics. This trend promotes the development of both the advanced computing methods and high performance computing techniques. The high performance of computing problems for inverse algorithms is discussed in this paper, which is meaningful for the research of applied inversion subjects.

Abstract: This paper proposes a fast query tree-based (FQT) algorithm for anti-collision in RFID system. Tags to be identified would be grouped by a reader randomly at beginning, and the reader identifies a group of tags and records the quantity of tags. Then reckons the number of all tags and carries out optimized group again. In identification process, the prefix of queries would add two bits in odd rounds, and one bit in even rounds. The results of analysis and simulation show that FQT algorithm can obtain the better performance than QT algorithm.

Abstract: This paper investigates the joint power allocation (PA) and relay selection scheme (RS) in two-way relaying cognitive radio networks consisting of multiple user-pairs and multiple relays. In order to reduce the computational complexity for practical scenario, we propose a branch and bound based (BnB-based) power allocation and relay selection scheme and a greedy power allocation and relay selection scheme to maximize the system throughput. The system is assumed under the constraint that the interference power from the secondary nodes in two way relay systems to primary user (PU) shall be less than a predefined interference threshold which can guarantee the normal communication of PU. Numerical simulation results show that the optimal PA and RS scheme has the highest system capacity, however, the greedy PA and RS scheme has the lowest complexity. The proposed BnB-based PA and RS scheme has the better tradeoff of system throughput and complexity than the above two schemes.

Abstract: Computer simulation technology is one of the main components of the construction of modern educational environment which provides rich and comprehensive operating model train for students and trains students in all aspects of technology and develops students' Potential ability and achieves the purpose of teaching science entertaining ultimately. This paper first analyzes the connotation of the computer intelligent simulation teaching. Based on this, it combines with three-dimensional recovery principle of dance moves under computer intelligent simulation technology. It also analyzes the dance teaching principle and teaching strength based on computer intelligent simulation. This paper puts forward relevant recommendations and enhances the systematicness and practical applicability of dance teaching in the field of education and teaching which opens up new path for dance education.