The Research Of Transportation Optimization Problem Of Emergency Logistic Under Public Emergency

In recent years, occurred frequently a lot of large-scale public emergency, such as the crises of SARS,the tsunami of Indian Ocean,the great earthquake of South Asia and Carterina Hurricane and so on, which not only resulted in gigantic loses, but also gave a sad memory to the people in the spot where calamity happened. Due to the high-speed development of modern society, the social problems about population,resource, environment and public sanitation burst out frequently and seem to be more dangerous and its influencing circle are much wider than before. According to the data analysis made by the international organization of natural disaster, the disasters the world suffered in 1990's are five times more than that in 1960's. In the case of China, it is in a crucial period when a series of public emergency occurs hourly because of social and economic high-speed development and such a situation would be exasperating since the process of urbanization is hurrying up. Meanwhile, in virtue of the specific geological conformation and the environment of natural geography, China is one of the countries attacked easily by natural calamities. The statistical data indicated that 31 fateful natural calamities erupted in 2005, so China could be regarded as the country where fatal natural calamities are fully maximized. In the process of that the emergency were coped with, the emergency logistic have to established in order to supply abundant lash-up materials to resolve or deal with satisfying the essential demand of the residents, burying the death, rescuing the sound, sanitary engineering, the reestablishment after the bale, resuming production and getting back the order, etc; or else, the area of calamities and loss of live and assets would be expanded continuously. So that the emergency logistic is established when the emergency broke out could render the bailout materials be delivered to the spots where need them, which would have an effect upon the outcomes of the whole succor. In this paper, one of the pivotal propositions in the sphere of the design of logistic system and emergency logistic was tackled that how to conceive and solve a model of relief commodity transportation and vehicle scheduling when large-scale public emergency break out. Through analyzing the purpose, difference and restrictive conditions of emergency logistic, a system of emergency logistic was created to cope with the special surroundings of emergency. Based upon the summarization of restrictive conditions of relief commodity transportation conduced by emergency, a model of relief commodity transportation, vehicle scheduling and reliable path finding was contrived and figured out. A system of emergency logistic was constituted in this paper for emergency personnel who can get directions about how to quickly, effectively and reliably make out a project of relief commodity transportation and vehicle scheduling in a complicated surroundings. The main topics in this paper are as following:(1)From the properties of emergency and the mechanism of emergency management, the attributes and the aims of task of emergency logistic was summarized and the differences between emergency logistic and common commercial logistic about targets, driving power, commodity supplier, designation of logistic wet and external surroundings were compared and analyzed in detail. According to the state partition of emergency management and the evolving process of the difference between emergency logistic and common commercial logistic, the circulation of emergency logistic was summed up four steps, i. e. daily management, start-up phase, calm function and dealing with problems arising from an emergency and the transitional conditions between different phases are also described. After the moment of calm function, the main differences between emergency logistic and commercial logistic were eliminated, so the performer of logistic system can be transitioned to the third cooperation. In term of the thoughts of cross-dock operation, a supplying web of emergency logistic special to the moment of starting up was designed by utilizing a configuration of tabularization. This web was made up of three establishments: the center of logistic, the transferring spots of commodity and demanding centers. The objects of quick response and satisfaction of demands in emergency logistic could be realized by making use of this web to deliver emergency commodity. By so doing, not only the caches of commodity on the move could be minimized, but also the odds of useless commodity's entering the system of emergency logistic could be played down.(2)As far as the sub question of transportation scheduling of relief commodity is concerned, the difference among relief commodity transportation, vehicle scheduling and vehicles routing problem was analyzed. By so doing, the restrictive conditions of this question was also concluded which includes how many kinds of commodity to be transported, how many supplying and demanding spots, supplying and demanding quantity of commodity, the changes of supplying and demanding spots, the possible station of vehicle in the supplying web, the limited magnitude and its variation caused by time and so on. To depict this involutes problem, a multi-model layer network was created to show the commodity's moving from starting-up spot to destination and the behavior of vehicle's circulating utilization. And then based upon the model of network fluid, a model of mix integral programming about relief commodity transportation and vehicle scheduling was fabricated. The Lagrange arithmetic transportation scheduling founded on the Lagrange Relaxation was designed to resolve the approximate optimal solution of this model. Finally, an experiment was contrived which includes three transporting model, seven peaks and two commodities. Such arithmetic can be imposed to tackle the model, analyze the calculating aftermath and validate the astringency of the arithmetic. Meanwhile, the favorable robustness of the arithmetic under the condition of the fluctuation of parameter output was also testified by adjusting the value of parameter imported.(3)The key deciding problem of relief commodity transportation in emergency logistic was studied in which there are two sub problems: the transportation scheduling of relief commodity and reliable path finding .Since the local means of transportation are often destroyed by emergency, a proposition of reliable path finding was worked over in order to cut down the emergency's effect upon the local path web and safeguard the relief commodity to be delivered to destination. Whereas a function of probability distributing about path traveling time can not be obtained by the method of sampling tests when the emergency breaks out, a model of reliable path finding not depending upon the probability distributing of path traveling time was brought out. By employing blur synthesizing score to assess the effect the influencing factors give to the traffic states, a congregate of scenes was established to describe the incredibility of traveling time in the transporting web and then the optimal solution of this model was calculated by taking advantage of a model of absolute and relative reliable path finding designed by Minimax theory, choosing a reliable path from jumping-off point to destination and making use of a arithmetic based upon dynamic programming. By so doing, the reliable path to the target could be grabbled when emergency erupted, this would lessen the complexity of how to resolve the proposition of transportation scheduling of relief commodity.By studying the propositions mentioned above, the personnel who safeguard the emergency commodity could be assisted to dream up a system of emergency logistic effectively to guarantee supplying relief commodity when an emergency bursts out, to frame a project of minimization of transporting time and cost and vehicle scheduling in order to find out a reliable path for commodity transportation and to bring forth an effective manipulating project and deciding model for the calamity bursting out abruptly. By so doing, the demand for relief commodity could be satisfied at the best times, the casualty of personnel could be lessened and the shock the titanic public emergency present to the social normal order could be in control.