Key Engineering Materials Vols. 474-476

Abstract: The communication interface technology of Model Base Management System (MBMS) and Database Management System (DBMS) is one of the key technologies for successful implementation of Decision Support System (DSS). This paper firstly introduces the concept model of communication interface between MBMS and BMS in DDS. Then it makes an analysis of the principle of communication interface between MBMS and BMS in DDS. Based on the analysis, three ways of its implementation are proposed: Standard Format Method, Function Method and Embedding Method, which finally realize the ODBC-based application of communication between MBMS and DBMS in DSS. This paper is of great reference significance for solving communication problems among database, model base, data warehouse, knowledge base, expert base and method base, and for accessing heterogeneous data or even extreme data in such emerging Decision Support Systems as Distributed DSS, Group DSS and Intelligent DSS.

Abstract: Based on the characteristic of oilfield development programs, we comprehensive analyzed the influence of development and economical factors on development program, and constructed a comparative evaluation factors system of oilfield development program. In addition, based on the comparative analysis of grey theory and fuzzy evaluation, a grey-fuzzy appraisal method was set up and successfully applied to the evaluation of oilfield development programs. Grey theory was used to describe the factors that are difficult to quantification, and the analytic hierarchy process was used to confirm the appraisal factor’s weight and grey level. Furthermore, we chose eight development programs of an oilfield as our evaluation target and get an option sequence by using the grey-fuzzy method. The result shows that, grey-fuzzy methods have more advantage than fuzzy method in the evaluation of oilfield development programs.

Abstract: In order to make reconstruction of re-configurable manufacturing system (RCMS) more efficient and fast, a new design method for control structure and system layout is put forward. First, a holon control structure, such as centralized-control, hierarchical control, non-strictly hierarchical control, and distributed control, is introduced. Each function module of the control structure not only has relative independent character and also cooperation with other control structure. It may constitute the required structural according to the market demand at any time to realize re-configurable control goals. At last, the key technology and the implementation method involved in layout design of equipment and system layer are discussed.

Abstract: Through the geometry models of ceramic powders flan and move beam and piston established, and the actual ceramic powders parameters and the pressure of tile press defined and loaded, the individual effects were analyzed in the single-acting and the dual-acting piston-cylinder in the process of the power compaction, which also offered the theory basis for the design in the move beam in the future at the same time.

Abstract: In calculation of structural dynamics, determining principal mode of multi-freedom system structure often is an issues concerned by the engineering and technical personnel. The supperposition method is one way which is usually widely used by engineering and technical personnel, but this method has its limitations. This paper introduces common calculation methods of the structure of principal mode, and the amendment solution of the supperposition method is deduced. This method is accurate through checking of the examples.

Abstract: The effect of Pb in copper alloy on the diffusion bondability of copper alloy and ZrO₂ ceramic was investigated. The diffusion bonding was carried out at 1173 K for 3.6, 7.2, 14.4 and 21.6 ks under the pressure of 2, 4, 6, 8 and 10 MPa in the vacuum of 1.3 Pa. Microstructure of the bonding interface and the shear fractured surface was researched by SEM and EPMA. The bonding strength was examined with the shear test. The addition of Pb shows the positive effect on the bondability of copper alloy and ZrO₂ ceramic. In the joints of Cu-xPb (x=0, 0.5, 1, 2) alloy and ZrO₂ ceramic, Pb at the bonding interface releases the thermal stress which was introduced at and near the bonding interface, and it results in the high shear strength of about 50 MPa. The combined addition of Pb and other elements (Ag, Mg, Zn, Al, Ti, Sn and Ni) was not effective on the bondability in all joints.

Abstract: Plum Blossom as the Chinese traditional flowers may be unique all over the world and has the first right of access to international registry of flower. In this paper, the SpeedTree softwareSDK is used to create a large plum tree forest with the graphics texture mapping technique, and the plum tree image maps express the geometric model of the surface material, which constitutes a visual image of the graphic objects. It is significant for non-destructive study of plum and virtual garden.

Abstract: MAC protocol of Wireless Sensor Network (WSN) requires high efficiency to achieve maximum traffic transmission, while pursuit high reliability at the same time. The paper researched on reliable mixing broadcast implementation manner of WSN. Based on analysis on implementation manners of broadcast, unicast and mixing broadcast, a kind of adaptive MAC protocol supporting reliable mixing broadcast was presented. The protocol dynamically select implementation manner with maximum mixing broadcast efficiency based on given network parameters to complete transmission of data frame. Simulation results based on NS2 shows that the protocol has better performance to achieve reliable mixing broadcast, which solve problems of reliable broadcast/multicast at network layer.

Abstract: The characteristics of Wireless Sensor Network (WSN) determine that traditional security certification mechanism can not meet its security needs. Based on introduction of a distributed hierarchical WSN model, the paper divided WSN network architecture into application layer, base station layer and sensor node layer according to difference of computation speed, power energy, communication capability and storage space of sensor nodes. A kind of security certification schema of hierarchical distributed sensor network based on certificate reconstruction was presented. In the schema, application layer and base station layer used common digital certification of PKI model to construct trust relationship. The sensor node achieved identification authentication and data source authentication through certification reconstruction.

Abstract: The basis to build effective network security protection is to reasonably evaluate on network security. Based on analysis on shortcomings of existing network security evaluation methods, the paper built network security evaluation index system according to CC specifications. The advantages of local variable weight comprehensive method were analyzed and the method of network security evaluation based on combination of AHP and local variable weight was presented. The evaluation example on some network elements indicates that the method evaluate on overall information security level, so that the evaluation result be objective and reasonable.