Applied Mechanics and Materials Vols. 263-266

Abstract: This paper is to discuss how Python can be used in designing a cluster parallel computation environment in numerical solution of some block predictor-corrector method for ordinary differential equations. In the parallel process, MPI-2(message passing interface) is used as a standard of MPICH2 to communicate between CPUs. The operation of data receiving and sending are operated and controlled by mpi4py which is based on Python. Implementation of a block predictor-corrector numerical method with one and two CPUs respectively is used to test the performance of some initial value problem. Minor speed up is obtained due to small size problems and few CPUs used in the scheme, though the establishment of this scheme by Python is valuable due to very few research has been carried in this kind of parallel structure under Python.

Abstract: With the increase of drilling data scale, real-time optimal drilling engineering seems to be difficult only by manual or traditional computer data, numerical, even simple knowledge processing. In such a case, Integration knowledge system is proven to be helpful in optimal drilling and improvement of drilling efficiency. A integrated and shared platform is built up about multi-source heterogeneous drilling data and information, to establish the conditions of intelligent reasoning; A multi-hierarchy and multi-modality knowledge model is created based on Ontology, they can define the performance, structure, function, axiom and case of glossary in oil drilling optimization domain, and integrate drilling optimization requirement, static and dynamic drilling data and Problem-Solving Method(PSM)；An evolutionary uncertainty reasoning mechanism is built up to integrate rule and case reasoning based on Bayesian Network; An integrated knowledge system is exploited based on the knowledge model of and its reasoning. By application in oil field, the results show its intelligent level and reliability improve clearly, and prove that optimal drilling knowledge model created based on ontology can meet the neets of share and re-usability of knowledge in a special field, and the model has wide application prospects.

Abstract: The living environment of the rural livestock has the influence on livestock health and production performance. Its living environment in general is composited by the warm air temperature, humidity, airflow (wind) speed and solar radiation. Air flow conditions within the livestock and poultry establishments have a significant impact on livestock living environment and other factors. In this paper, the method of computational fluid dynamics is used to analyze the distribution of the velocity field and temperature field within the fan imports and corridor export conditions of livestock and poultry breeding places. The results show that: the airflow in the vicinity of the air inlet fan speed larger maximum reach 6.09m / s, the wind speed is low in the other regions. In Breeding places, the air flow near the fan on both sides of the wall near vortex, the more the more obvious near the center of the vortex of the place. The temperature near fans inlet is significantly lower than that near the other regions. The research results will provide ventilation of livestock breeding places designed to provide a theoretical basis and guidance.

Abstract: Analog field computation is a newly emergent unconventional computing area. The micro-Extended-Analog-Computater (uEAC), a typical analog field computation model, achievs the mapping by a configurable analog electrical field and multi-value logic units. In the paper, the static model of a single uEAC unit is established and the limition on nonlinear mapping is discussed. According to the analysis results, an uEAC array with a full-connceted topology is proposed, furthermore, Particle Swarm Optimizater (PSO) is adopted to configurate the topology and resistance matrix. As a results, various uEAC array with more special topology and more computing power. The novel uEAC array is designed as a controller of a gimbal system. Simluation results demostrates the special structure and effectiveness of the uEAC array controller.

Abstract: In this paper, an embedded architecture of optical vector matrix multiplier (OVMM) is presented. The embedded architecture is aimed at optimizing the data flow of vector matrix multiplier (VMM) to promote its performance. The performance according to the architecture is analyzed and the simulation shows that Amdahl's law is used to analyze the hybrid opto-electronic system, and the electronic part and its interaction with optical part form the bottleneck of system.

Abstract: It is challenging to efficiently find similar pairs of objects when the number of objects is huge. The locality-sensitive hashing techniques have been developed to address this issue. They employ the hash functions to map objects into buckets, where similar objects have high chances to fall into the same buckets. This paper is concerned with a locality-sensitive hashing technique, the projection-based method, which is applicable to the Euclidean distance-based similar pair identification problem. It proposes an extended method which allows an object to be hashed to more than one bucket by introducing additional hashing functions. From the experimental studies, it has been shown that the proposed method could provide better performance compared to the projection-based method.

Abstract: Most of the methods for ontology merging need participation of domain experts and provide only partial automation with low efficiency. It is time-consuming and laborious especially when large amount of data are to be merged. In this paper, a method based on semantic is designed for ontology merging according to the case of ontologies to be merged. In this method, first the ontologies to be merged are conversed into a unified format. Then a secondary file is generated. After that semantic analysis is applied to secondary file and a dynamic SQL statements is generated automatically. At last the SQL statements are executed to finish ontology merging. It has been proved by the experiment that using this method would get good precision and high efficiency. Using this method, two ontologies Chinese Agricultural Thesaurus and AGROVOC of the Food and Agriculture Organization are merged successfully.

Abstract: Combining graphical user interface in Visual Basic (VB) and numerical computing capability in FORTRAN, the hydro-meteorological model of the plain river network region was developed. This paper discussed some key problems, such as calling FORTRAN DLL from VB, FORTRAN compiling executable file called by VB, and the visualization platform development with VB and FORTRAN. It solved the problems of data processing, data transmission, and calling hydrological model. Mixed-language programming technique is a very effective and useful way of building visualization platform.

Abstract: By using OPNET simulation platform, the network simulation model of campus network was constructed and the user’s behaviors of the networks were analyzed. The network latency, the page response time and the throughput capacity of the switch were simulated in the original campus network and the extended network. By using the two sets of data for comparison and analysis, the impact of the campus network performance factors and "bottleneck" were found. An appropriate optimization design of the campus network was proposed and simulated again. Through the simulation, the reliability and accuracy of the design will be proved, and the network construction period will be shortened.

Abstract: XML has become one of the general data exchange formats in the current Web application programs, with a wide range of applications in e-commerce, e-books, mobile communications and other fields. XML data storage technology is the key technology for XML applications, and an effective XML data storage, retrieval and management mechanism is a strong driving force for the development of XML. At present, XML data storage technology is generally divided into two categories, which are storage technologies based on a file system and based on a database. In this paper, the technical characteristics of the two XML document storage modes have been discussed, and their advantages and disadvantages have also been analyzed and compared.