Advanced Materials Research Vols. 671-674

Abstract: A theoretical model in this article which is used to evaluate leading order vortex decay behind an aircraft, is presented. This model is then applied to two important problems. The first evaluates safety separation distances for the super class of aircraft exemplified by the Airbus A380. The second evaluates the swirl parameter which is shown to decay to a sufficiently lowlevel that short-wave instabilities are likely to be instigated. The model uses the Oseen approximation,which assumes that in the far-field the ratio of the perturbed velocity to the aircraft velocity is small, and developed from recent publications by the first author. The atmospheric turbulence is incorporated into the model by using effective viscosity.

Abstract: In order to alleviate the low efficiency utilization of public transportation resources in the urban traffic of our country, the paper is put forward to analyze the planning methods of integrated passenger transit network, which gives an emphasis on the efficient cohesion, coordination and transfer between different modes of transportation, as well as gives a consideration to the urban development planning and the program of land layout. With a large number of data and field investigation, the paper found, based on the site and hinge layout planning provided the O-D points of the route, we should give full consideration to the constraint conditions and set goal functions, then match each O-D point and choose the appropriate sections and appropriate means of transportation, when we do the planning of integrated urban passenger transit network. Meanwhile this paper established the model of a bi-level programming and the corresponding bi-level iterative algorithm. Finally the model will be applied to the passenger transport of Hohhot , and the various indexes before and after the project will be compared in order to test whether the model established is correct or not.

Abstract: In the background of the integration, how to scientifically and reasonably distribute transfer hubs becomes the problem needed to be solved urgently on traffic experts. First of all, this paper gives initial selections of transfer hub layout planning; then, on the basis of analyzing the influence factors of the layout planning, the evaluation index system is built; and based on rough set attribute reduction knowledge, the cluster analysis of initial selections is done by using the SOFM neural network, drawing the suboptimal alternatives; afterwards, through the establishment of the TOPSIS model based on entropy weight, the suboptimal alternatives are further optimalized, ultimately getting the optimal solution; finally, taking the haidian district of Beijing as an example, the model and algorithm of the subject are validated.

Abstract: A novel method based on the characteristic of view point time and transients was presented on the data collected by iView X HED. It adopted snow and non-snow road as vehicle circumstance, and acquired the time and transients of driver’s view-points. An experiment was introduced at the key time point in the traffic to analyze the regulations of time and transients. The results provided the average value of view point time and transient, the parameter estimation in the condition of ice-snow road is longer than that in non-snow road.

Abstract: The paper puts forward a modification plan which combines the wireless communication network with power line communication to reduce energy waste in the city lighting system at night. The system framework is divided into three layers, the backend server controls the centralized controllers through the core network; each centralized controller controls the lamps through the access network; node controller on each street light works as a terminal which controls the light according to the commend receives from the centralized controllers through PLC. The system combines wireless communications, power line carrier, LED circuit constant current drive with PWM stepless dimming technology. The application results show that the system can reduce the electric energy consumption obviously, and the intelligent street lamps operate stably and reliably.

Abstract: The technologies of traffic parameters prediction provide future traffic information so that management measures for traffic congestion can be made timely and accurately based on the retrieved information. According to the shortcomings of traditional methods for predicting traffic parameters, a rolling time series method is proposed through improving the traditional time series methods. To test the performance of our proposed approach, the rolling time series method is compared with the traditional time series methods using measured traffic flow based on a part road network of a large urban area in China. The results show that the prediction effects by the rolling time series method developed in this study are better than traditional approaches.

Abstract: A prediction algorithm for traffic flow prediction of BP neural based on Differential Evolution(DE) is proposed to overcome the problems such as long computing time and easy to fall into local minimum by combing DE and neural network . In the algorithm, DE is used to optimize the thresholds and weights of BP neural network, and the BP neural network is used to search for the optimal solution. The efficiency of the proposed prediction method is tested by the simulation of real traffic flow. The simulation results show that the proposed method has higher precision compared with the traditional BP neural network，so prove it is feasible and effective in the practical prediction of traffic flow.

Abstract: To meet the goal of resource allocation optimization and port working efficiency, this thesis has proposed a kind of heuristic algorithm，Based on port optimal resource allocation theory and multi-objective dynamic characteristic analysis research, taking minimum anchorage Period as objective，separating from the individual berth and quay crane allocation method， this thesis analyzes berth-quay crane as one unit, building up the optimal resource allocation mathematic prototype of berth-quay crane with its working constraint conditions，which objectively reflects the actual port system status with full consideration on port flexibility and quay crane continuity characteristics.

Abstract: Each of the significant influences on aircraft project design is described. It starts with a broad introduction to civil air transport, followed by a detailed description of the design process and a description of aircraft layout procedures. The next are concerned with detailed descriptions of the design methods and an introduction to the principal aircraft components. The end chapters deal with the parametric methods used to refine the design configuration and a description of the formal presentation of the baseline design.

Abstract: This paper discusses the determination of safety evacuation time for passenger and staff in subway station in accordance with passenger flow and traffic capacity of escalator and stairs in subway station, concurrently modifies the formula to calculate the safety evacuation time by means of different determination of passenger flow predicted in advance by dint of origin and destination investigation in subway station. And a proposal to consider the maximum passenger flow within every subway train departure interval is also presented in determining the evacuation time when calculating the traffic capability of escalators and stairs.