Science Accelerates the Modernization of Communications and Transport

Scientific progress has greatly improved the technical level of China’s highway and waterway transport in the past ten years. In order to modernize communications and transport and raise competitive power of enterprises as early as possible, the Ministry of Communications has decided to add more scientific investment, planning to double the annual expense on scientific investment during the Ninth Five-year Plan period compared to the Eighth Five-year

SCIENCE ACCELERATES THE MODERNIZATION OF COMMUNICATIONS AND TRANSPORT

Scientific progress has greatly improved the technical level of China’shighway and waterway transport in the past decade.In order tomodernize communications and transport and raise competitivepower of enterprises as early as possible,the Ministry of Communicationshas decided to add more scientific investment,planning to double theannual expense on scientific investment during the Ninth Five-yearPlan period compared to the Eighth Five-year Plan period.Theministry will also conduct cooperative research,development,designand production with foreign scientific institutions and internationalorganizations.

Microscopic dynamic simulation model for pedestrian at signalized intersection

Pedestrian's road-crossing model is the key part of micro-simulation for mixed traffic at signalized intersection.To reproduce the crossing behavior of pedestrians,the microscopic behaviors of the pedestrians passing through the crosswalk at signalized intersection were analyzed.A pedestrian's decision making model based on gap acceptance theory was proposed.Based on the field data at three typical intersections in Beijing,China,the critical gaps and lags of pedestrians were calibrated.In addition,considering pedestrian's required space,a modification of the social force model that consists of a self-deceleration mechanism prevents a simulated pedestrian from continuously pushing over other pedestrians,making the simulation more realistic.After the simple change,the modified social force model is able to reproduce the fundamental diagram of pedestrian flows for densities less than 3.5 m-2 as reported in the literature.

A two-stage short-term traffic flow prediction method based on AVL and AKNN techniques

Short-term traffic flow prediction is one of the essential issues in intelligent transportation systems(ITS). A new two-stage traffic flow prediction method named AKNN-AVL method is presented, which combines an advanced k-nearest neighbor(AKNN)method and balanced binary tree(AVL) data structure to improve the prediction accuracy. The AKNN method uses pattern recognition two times in the searching process, which considers the previous sequences of traffic flow to forecast the future traffic state. Clustering method and balanced binary tree technique are introduced to build case database to reduce the searching time. To illustrate the effects of these developments, the accuracies performance of AKNN-AVL method, k-nearest neighbor(KNN) method and the auto-regressive and moving average(ARMA) method are compared. These methods are calibrated and evaluated by the real-time data from a freeway traffic detector near North 3rd Ring Road in Beijing under both normal and incident traffic conditions.The comparisons show that the AKNN-AVL method with the optimal neighbor and pattern size outperforms both KNN method and ARMA method under both normal and incident traffic conditions. In addition, the combinations of clustering method and balanced binary tree technique to the prediction method can increase the searching speed and respond rapidly to case database fluctuations.

A study of urban traffic based on the temporal maps:the case of Guangzhou City

Temporal map is an isochronal map taking time as a measuring unit. It traces out the isochrones according to the discrepancy of the time distance between the different sites from the outside of the city and the down town, It can be clear and intuitional to show the different temporal relationships between the outside of the city and the city centre with the temporal map, The problem of traffic congestion, with its potential /br urban chaos, has increased dramatically with a growing number of vehicles and the continuing aerial expansion of Guangzhou. Both transit riders and drivers find it is a great difficulty to try to acquire the necessary information from urban spatial movements. Valuable time is lost due to the absence of good transportation information. So, the paper analyzes a case in Guangzhou communication with Geographic Information System （GIS）, and uses the most popular vehicles, including buses and taxis that are used to measure the temporal distance in the city. and then proposes the design of a new map that better reflects the status of urban communication, and attempts to change the relationship between one point and another potnt of travel, reducing the amount of time allocated to such. often complex, movements, This paper also points out the obstacles associated with Guangzhou＇s existing traffic congestion, and puts forward a strategy aimed at better d .efining the need of linking the temporal map to spatial map of Guangzhou.