Applied Mechanics and Materials Vols. 130-134

Abstract: This paper briefly introduces the requirtment analysis of the production management and cost control platform of the manufacturing enterprises, and the designing of the platform;it also introduces the main techniques and measures.

Abstract: In order to improve black soil productivity in the Songliao Plain Cornbelt, a new tillage technology “deep plowing with mulching” was established. The effects of different tillage systems (deep plowing with mulching, subsoiling tillage and conventional tillage) on soil profile construction and aggregate stability were studied in this paper. The results showed that different tillage systems led to different patterns of soil profile construction; the deep plowing with mulching, subsoiling tillage and conventional tillage formed “flat type”, “undulated type” and “groove type” in the interface between plow layer and plow pan, respectively. Compared with subsoiling tillage and conventional tillage, deep plowing with mulching significantly increased the contents of macroaggregates, and decreased the aggregate deterioration rate in the plow layers. This work demonstrates that the new tillage technology could promote soil aggregate stability and contribute to soil structure improvement in the Songliao Plain Cornbelt, China.

Abstract: Mathematical models are proposed to determine the most suitable shape of a snowboard course based on vertical air, maximum twist and the practicability. Firstly, according to the kinetic energy theorem, the snowboarder can reach the maximum vertical air if the course is an ellipse. Subsequently, the maximum twist is obtained when the total vertical and horizontal velocities is maximum. Experiment result show that the model is a “practical” course which is adjusted to the most suitable tradeoffs.

Abstract: According to the mobility and continuity of the flow of data streams，this paper presents an algorithm called NSWR to mine the frequent item sets from a fast sliding window over data streams and it meets people’s needs of getting the frequent item sets over data that recently arrive. NWSR, using an effective bit-sequence representation of items based on the data stream sliding window, helps to store data; to support different support threshold value inquiry through hash-table-based frequent closed item sets results query method; to offer screening method based on the classification of closed item sets for reducing the number of item sets that need closure judgments, effectively reducing the computational complexity. Experiments show that the algorithm has better time and space efficiency.

Abstract: A fuzzy comprehensive evaluation method for nuclear power plants is introduced in this article. First, a risk index system is established of which these indicators will be explained accordingly latter. Then, an evaluation set is constructed, and the weight of each index and corresponding membership is determined according to suggestions of experts and membership function to make evaluation level by level ，until a final comprehensive evaluation is obtained. This method is not very objective but simple and available.

Abstract: In the welding training process, due to a large amount of training data, artificially can’t from these data information to evaluate the quality of teaching and learning. The paper through statistical analysis technology, research the source of training period based on the records of teaching and learning , thus targeted training , shorten training cycle to improve work efficiency.

Abstract: Considering the un-deterministic transportation networks, the paper proposes the change of the route choice decisions under the stochastic transportation networks. The route choice behavior is described as a choice for a time shortest route which is subject to a time-reliability level. The paper also considered this new route choice behavior in the stochastic user equilibrium model, and proposed stochastic user equilibrium model based on the optimized reliability travel time route choice behavior in the stochastic networks. The equivalence and uniqueness of the solution of the model are demonstrated. Numerical results of a small network show that the proposed model can reflect the real traveler’s route choice behavior in stochastic transportation networks.

Abstract: The paper analysis the influence of ice snow on flow at the view of the driver and the car, and through measuring a certain road in Heilongjiang province, getting three parameters of flow, speed and density of early high peak period of the ice snow road and normal road. The data that passes the actual diagraph builds up the transportation to three parameters of flow speed-density model, taking this model as the foundation, deducing a speed-density model. Pass the method that begs the pole value to the speed-discharge model, get to ice snow and no ice snow two kinds of appearances of the research road segment of go through the ability physically. Pass the research road segment the transportation environment and the road line forms of the place, established to affect the factor that that road goes through the ability physically and it to should of coefficient, thus build up the influence factor model that rises the calculation to go through the ability physically.

Abstract: Risk assessment for information security is uncertainty. To control these uncertainties is of great significance for effective risk assessment [1].There are many assessment methods, and the conclusions from them are less clear. This paper presents a fuzzy logic based information security risk assessment method FLISRAM. In this method, the results are from a comprehensive assessment for assets, threats and vulnerabilities of the information system.

Abstract: The article elaborates the fundamental notion theory of assembly line balancing, aiming at F company’s assembly line actuality. It solves the practical problem occurred on production line by using heuristic method, and finally uses the methods of allocation in operations research. After the manufactory line balancing analysis, it raises the assembly efficiency obviously. Heuristic method is simple and practical to master, and the method provided in this paper could be popularize to other similar manufacturing factory.