Advanced Materials Research Vols. 219-220

Abstract: Most of Web data mining systems did not construct user profiles and could not support personalized Web data mining. Aiming at the shortcomings, the paper defined and established user profiles. On the base of this, the paper designed a personalized Web data mining system, namely PWDMS. PWDMS consisted of user interface module, data preprocessing module and data mining module. In addition, this paper discussed the key technology of PWDMS. It is proved that applying personalized technology to Web data mining is efficient.

Abstract: Intermittent target tracking (ITT) method is proposed based on radar network theory to keep the tracking precision while resisting anti-radiation missile effectively. ITT theory is analyzed first. Then, three relevant evaluation indexes and an improved adaptive sampling algorithm are proposed. Under the same condition, this paper simulated three different target tracking methods, i.e., single radar in ITT, single radar in fixed sampling period tracking and tracking method proposed in the paper. Simulation results show the validity of the method proposed in the paper.

Abstract: Most distributed algorithms of mining global frequent itemsets worked on net structure network and adopted Apriori-like algorithm. Whereas there were some problems in these algorithms: a lot of candidate itemsets and heavy communication traffic. Aiming at these problems, this paper proposed a fast distributed algorithm of mining global frequent itemsets, namely, FDMGFI algorithm, which set centre node. FDMGFI algorithm made computer nodes compute local frequent itemsets independently with FP-growth algorithm, then the centre node exchanged data with other computer nodes and combined, finally, global frequent itemsets were gained. FDMGFI algorithm required far less communication traffic by the searching strategies of top-down and bottom-up. Theoretical analysis and experimental results suggest that FDMGFI algorithm is fast and effective.

Abstract: Wear behaviour of aged casting Cu-Al-Fe-Be and Cu-Al-Fe-Ni aluminum bronzes was studied in this paper. The microstructures, mechanical properties of hardness and tensile strength, were evaluated experimentally. The friction and wear resistance, and the electrical resistivity of the materials were assessed. The results show that mechanical properties of the Cu-Al-Fe-Be alloy have been improved by solution treatment at 950°C for 120 min followed by aging at 350°C for 120 min, whilst the most suitable heat treatment for the Cu-Al-Fe-Ni alloy was solution treatment at 950°C for 120 min followed by aging at 450°C for 120 min. In the wear testing, the as-cast alloys was dominated by abrasive wear, and the increase in load and sliding velocity, the adhesive wear and oxidation wear dominated. The experimental results also showed that the Cu-Al-Fe-Be alloy possessed higher hardness and tensile strength, lower friction coefficient and lower wear rate compared to the Cu-Al-Fe-Ni alloy.

Abstract: Variable precision rough set (VPRS) model and formal concept analysis are studied in this paper, include algorithm of reduction attribute and extraction rule. The traditional algorithms about attribute reduction based on discernibility matrix and extraction rule in VPRS are discussed, there are problems in these traditional algorithms which are improved. Rough concept lattice model is proposed based on integrating of variable precision rough set model and formal concept analysis, and is used to reduce formal context. The domain ontology model of e-business is built combined with knowledge of domain expert, and original ontology model of the United Nations Standard Products and Services Classification Code by way of core ontology in order to enhance system robustness and efficiency.

Abstract: This paper diagnoses institutional culture of state-owned forestry enterprises. Then, it reconstructs and fosters institutional culture for enterprises’ development to enhance the competitiveness of state-owned forestry enterprises. According to Denison Organizational Culture Model and Corporate-Culture Measurement and Assessment System of Redetac Consulting, this paper diagnoses seven dimensions and fifteen factors of institutional culture of state-owned forestry enterprises. This discovers that problems of leadership system, personnel system and management mode are more serious and indicates that business leaders should reconstruct those to form democratic decision-making, scientific training, performance assessment and other system and should adopt approaches of management by walking around, gather-style management, and people-oriented management.

Abstract: In order to evaluate the survivability of networked information system effectively, this paper presents a method of combining grey relation analysis and TOPSIS for quantitative assessment. Firstly, a hierarchical model of information system is constructed. Then it normalizes indicator matrix according to traditional TOPSIS method, determines the positive and negative ideal solutions, calculates the optimal dependency degree of critical services in terms of grey relation analysis, and evaluates the whole networked information system depending on the survivable function. At last this paper gives an example to show the availability and the value of the method.

Abstract: A control system for service robots based on a 32-bit ARM processor with kernel S3C2410 is proposed. The entire structure of the control system of embedded service robots is designed in the paper. And designs of each circuit and software of the system are demonstrated respectively in detail. The control system proposed has advantages of modularized structure, small size, low power dissipation, hard real-time and high reliability, etc.

Abstract: In order to reduce the fault detection rate and improve the self-adaptive capability in network fault detection, an artificial immune mechanism which is inspired by multi-layer defense of a biological immune system is proposed to perform network fault detection. The immune model is composed of three parts: the inherent detection layer, fuzzy judgment layer and adaptive detection layer. Dendritic cells can influence the reaction of coordinating T-cells, which can be activate or tolerate so that induce adaptive immune responses and affirm the type of adaptive response. Inherent detection layer and fuzzy judgment layer interact with each other to reduce the error detection rate, while the adaptive detection layer is capable of learning unknown fault patterns.

Abstract: The overlay algorithm is an important branch in computational geometry field, it is an important process for computing exact Minkowski sum of two convex polyhedrons. By improving the existing plane sweep algorithm, the overlay algorithm for simple subdivision of arbitrary polygon in plane is given. The algorithm can be used to overlay arbitrary polygon after subdivision into simple polygon in the plane. It has lower time complexity than the existing overlay algorithm. The whole algorithm consists of three steps: line segment intersection, reconstructing topology and constructing the DCEL for overlay graph. The results show that the algorithm can compute the overlay of two planar subdivisions in linear time.