Applied Mechanics and Materials Vols. 97-98

Abstract: The sustainable development evaluation of urban rail transit investment project is an important component of its post-evaluation. It is a complicated problem with multi-aspects, multi-levels, and multi-objectives involving the society, economy and environment and so on. Firstly it analyses the necessity of sustainable development evaluation of urban rail transit investment project and describes its concept, then discusses and expounds the multilevel evaluation index, and establishes the evaluation model of sustainable development for urban rail transit based on rough set and analytic hierarchy process. Finally, the result indicates that this evaluation method based on rough set is a simple and feasible method for the sustainable development evaluation on urban rail transit investment project.

Abstract: In order to analyze the drainage performance of the pavement structure with permeable base course and edge drainage system, based on the theory of unsaturated seepage, the rainfall infiltration into the highway pavement is simulated numerically and the two-dimensional seepage analysis model is set up. The AASHTO evaluation index t50 is employed to evaluate the drainage performance. The results show that, in comparison with the pavement without internal drainage system, water can be drained away more rapidly from pavement structure with the permeable base course and edge drainage system and the volume water content in pavement is reduced effectively.

Abstract: The aim of this study is to understand the reasons behind the mode choice preferences of passengers using a public transport transfer center. For this aim, a questionnaire data obtained at an interim transfer center in Istanbul is utilized. This interim center hosts stops for paratransit, bus and metro modes. A multinomial logit model of modal preferences is estimated and the coefficient results of this model are used to analyze and compare modes.

Abstract: Improving the skid resistance performance of asphalt pavement is an effective way to meet the requirements of safe driving on super long continuous downgrades. The anti-skid performance attenuation of SMA-16 was tested in laboratory. The results showed that SMA-16 could meet the requirement of anti-skid performance in early stage, but the anti-skid performance decreased rapidly on super long downgrades. The long-term anti-skid performance of anti-skid thin-layer had also been carried out in laboratory. We can come to conclusion that anti-skid thin paving layer can meet the requirements of anti-skid performance even in the end of design life. The anti-skid thin paving layer on super long downgrades was designed, which not only satisfied the durability of skid resistance performance but also reflected the demand of economics.

Abstract: The combined optimization of continuous berth allocation problem and quay crane assignment problem are solved. Considering the real constraints of container terminal, an improved genetic algorithm is proposed. The chromosome is composed of berthing time, berthing location and number of quay cranes. While in the following, specific quay cranes are fixed to assign to ships. Through comparisons with the former two literatures, the results are improved averagely by 33.78% and 28.57% respectively by the proposed genetic algorithm, which shows its effectiveness.

Abstract: To explore development and evolution mechanism of regional logistics system, analyzed complex regional logistics system consists of certain types of entities such as logistics supply sides, logistics demand sides, the government and its professional management departments, it is mainly studied that the physical flow process between logistics supply side logistics demand side and the corresponding size, structure and layout evolution and optimization process between and within the regional logistics. Moreover, on the basis, combined with Multi-Agent System (MAS), Cellular Automata (CA), and Geographic Information System (GIS) technology to build geographic simulation system (GSS), then, build regional logistics space evolution model based on GSS, in addition, analyze the agents, environmental conditions and their agent behavioral strategies of the model in order to analyze the evolution mechanism of regional logistics system. At last, through empirical analysis demonstrates the model in this paper is reasonable and also can offer the reference to region logistics planning and operation.

Abstract: As a component of the urban transportation system, on the one hand, traffic in logistical parks shares the common features of urban transportation; on the other hand, it still possesses its own rules and characteristics. This paper makes a comparison between traffic in logistical parks and cities and gives an analysis of the logistical parks’ traffic characteristics by using traffic engineering theory, thus to make a clear distinction between traffic in logistical parks and cities， to have a study of the traffic characteristics in logistical parks, and on the basis of this to make an exploration of the characteristics the planning and designing of road network in logistical parks.

Abstract: Modeling unloading operations at maritime container terminals has increasingly become crucial to container terminal planners. This paper presents the multistage flexible flowshop scheduling problem (MFFSP). The objective of the MFFSP is to determine a schedule that minimizes the schedule length for a given number of containers and handling equipment over a finite planning horizon. Since the MFFSP is NP-hard in the strong sense, metaheuristic solution method is employed. A global lower bound to measure the efficiency of the metaheuristic procedure is derived. The optimization procedure is based on Genetic Algorithm (GA) which is used to estimate the minimum schedule length for a number of problem instances. Computational experiments validate the developed MFFSP.

Abstract: The present study is focused on the Min-Max Vehicle Routing Problem (MMVRP). Genetic algorithm is used to get the optimization solution. First of all, use natural number coding so as to simplify the problem; apply insertion method so as to improve the feasibility; retain the best selection so as to guard the diversity of group; adopt 2- exchange mutation operator to strengthen the partial searching ability of chromosome. Secondly, the improved route crossover operation can avoid destroying good gene parts. Finally, the good performance of improved algorithm can be proved by experiment calculation and concrete examples

Abstract: Priority order decision of logistics parks construction project is an important issue in the process of logistics park planning. It needs to synthesize various factors, such as, politics, economy, society and environment, etc. Because there are some grey relationships among these factors, construction of the order of questions can be look on as a grey multi-objective evaluation. This paper brings forward a new priority decision method named hierarchy -gray comprehensive evaluation model to evaluate the building order of the logistics parks. An example is used to elaborate how to use this model; meanwhile, the method is proved more scientific and reliable.