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Regarding the bandwidth allocation of IEEE 802.16j two-hop relay networks, a Dynamic Bandwidth Allocation (DBA) algorithm based on the utility optimization is proposed. During the bandwidth allocation process of relay links, DBA algorithm takes the Quality-of-Service (QoS) requirements of different services into account by means of utility functions came from economic theories. Under the certain constraints,...
In view of the fact that the material thickness of grate cooler system is difficult to measure, we present a new method of modeling that takes advantage of genetic algorithm to optimize the BP neural network and has a contrast with the pure BP neural network. Simulation shows that the BP neural network model which is optimized by genetic algorithm has a small error. At the same time, it is more stable...
The large-scale Crossing Waypoints Location Problem (CWLP) is a crucial problem in the design of Air Route Network (ARN). CWLP is fully non-separable and non-differentiable, and thus traditional algorithms can hardly deal with it. This paper proposes an algorithm named Cooperative Co-evolution with Weighted Random Grouping (CCWR) to tackle it. CCWR employs the weighted random (WR) grouping strategy,...
Particle swarm optimization (PSO) is a novel evolutionary algorithm which has a better convergence rate and computation precision compared with other evolutionary algorithms. From the perspective of optimization, the self-tuning of PID controller parameters is to find the best global optimum value in the solution space of Kp, Ki, Kd. In this paper an optimal design of PID controller based on particle...
This paper presents a algorithm for three-dimensional packing in military airlift loading. In this case, the design variables correspond to the sequential order in which the items are considered for packing, thereby zero collision between items is implicitly in the packing procedure, reducing the need for collision detection and overall computation effort. Furthermore, we optimize the layout of items...
Optimization of wheel loader is a multipurpose and multivariable design process. The virtual prototype of working device of loader was built and the optimization of overall performance was finished based on virtual typing technology. Firstly, the parametric model was established and the simulation results were analyzed. Secondly, design study was carried out and the most important design variables...
Irregularity of the fixed frog affects the passage velocity and the comfort of urban railway vehicles. To reveal this irregularity, based on the Finite Element Method (FEM) computational models were set up. The models included the contact between the worn tread wheel of Dalian tram and the 50kg/m rail as well as the different sections of No. 9 fixed frog. The results were used to find the laws of...
The previous study of pattern discovery in storage systems focus on sequential pattern (SP) mining in lower level traces, but they don't scale well to the application level. For patterns in application level are mostly composed of Contiguous Item Sequential Patterns (CISP) which are much simpler than SP, so it's inefficient for the previous studies to mine CISP with clumsy SP mining algorithms. We...
This paper applies Robust Optimization method to optimize the airline network planning process. The Dijkstra's Algorithm is firstly introduced to improve the initial solution and neighborhood structure. And the Robust Optimization method is applied to the problem of selecting the hub aerodromes in the airline network to help the decision making process. Furthermore, a hub-and-spoke network among 15...
Cylinder container is a thin cylindrical shell sealed by a top and bottom plate. The internal noise reduction of the cylinder container is very important for vehicle, ship and other projects. A finite element model of the cylinder container vibration coupled with internal acoustic field is set up and the acoustic response feature is determined. Then, two optimization models are adopted: (1) the acoustic...
This paper develops an improved algorithm to optimize the airline network. The specialized Floyd shortest path method is introduced to improve the initial solution and neighborhood structure. And the improved algorithm is applied to the problem of selecting the hub aerodromes in the airline network. Furthermore, a hub-and-spoke network among 15 cities is constructed with the algorithm application...
To resolve the optimization problem of randomizing phase feeding for circular array, optimization of randomizing error quantization and direct encode optimization based on genetic algorithms are put forward. This paper analyzes the mathematical model of the randomizing phase feeding and performs this algorithm's computer simulation experiment on the basis of circular arrays. The simulation results...
Compactness is the key index to determine the work quality of vibratory roller, the intelligent control of compactness was the key and difficult technology for roller. In order to improve the compaction effect and the intelligence of automatic control of roller, an intelligent control system was constructed based on CAN bus, GA method was used to optimize the fuzzy control strategy in the controller...
The previous study of pattern discovery in storage systems focus on sequential pattern (SP) mining in lower level traces, but they donpsilat scale well to the application level. For patterns in application level are mostly composed of Contiguous Item Sequential Pattern (CISP) which are much simpler than SP, so itpsilas inefficient for the previous studies to mine CISP with clumsy SP mining algorithms...
Rotor is the major work components of vertical shaft impact crusher and tip set extra hard is the most wearing part of it. Based on the analysis of the structure and the working principles of the vertical shaft impact crusher, we set up the three-dimensional model of the rotor in Solid Works. Through the importation of the 3-D model into ADAMS for the dynamic simulation, we simulate the throwing process...
In this paper, we develop a joint design method of network-channel low density parity check codes (LDPC) codes by constructing joint network-channel parity check matrix. Random network coding is performed to provide side information for both the source and relay??s transmission. This system matrix makes an easy way to collect all independent signal copies to provide a spatial diversity gain. And the...
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