Advanced Materials Research Vols. 219-220

Abstract: By analysing the security needs and the threat model of data provenance, a Key distribution algorithm based on Logical Key Hierarchy(LKH) is brought forward aiming at the confidentiality of provenance. In this paper, we make use of the LKH tree to reduce the storage of the keys for session encryption keys(SEK) of provenance records and decrease the transmission overhead of the provenance chains, which meet the requirement of compressing provenance chains, and then propose the method of dynamic expansion number of auditors that works out the problem of the auditors number dynamic changes existing in the safety requirements for confidentiality of provenance records.

Abstract: Based on the sedimentary character of six time cells in P1 Beierxi of Sabei developed region in Daqing oil field, this paper applies fuzzy mathematics method to divide reservoir flow unit. At present, there is no uniform division method, because flow unit is a fuzzy set with multi factor influence. There is great uncertainty among every influential factor, so does the influence extent of every factor to flow unit division. It isn’t objective to divide flow unit by one factor or simple congruence of several factors. However, the fuzzy mathematic method is fit to analyze the uncertainty relation in system or among systems. When the data of core well is in defect, applying the fuzzy clustering method to divide flow unit and combining development practice can reduce human factor greatly and make classification more objective and rational.

Abstract: In reconfigurable system, hardware task placement algorithms are trying to find rectangle of available reconfigurable logic units in a fast manner. Furthermore, low cost and less fragmentation are another two metrics of high performance algorithm. In previous work we proposed a Transformable Vertexes Information based Algorithm (TVIA) for online task placement in reconfigurable system. In this paper, based on TVIA, we adopt Resource Swap scheme for reuse based hardware task scheduling. Hardware tasks will remain in the reconfigurable device after execution. Only when there is no enough space left for incoming tasks will previous tasks been swapped out from configurable device. This paper discusses the principle and procedure of resource swap management and compares several algorithms using simulation.

Abstract: This paper describes OHCP, a fast planner using local search based on Ordered Hill Climbing (OHC) search algorithm and local-minimal restart strategy. OHC is used as a basis of a heuristic planner in conjunction with relaxed planning graph heuristic. A novel approach is proposed in OHC framework to extract useful information from relaxed plans to preorder all promising neighborhoods, which can cut down the frequency of calling the heuristic evaluation procedure. In order to preserve completeness and improve search effort, a new restart strategy for complete search from local minimal is proposed when the local search guided by OHC fails. The ideas are implemented in our planner OHCP. Experimental results show strong performance of the proposed planner on recent international planning competition domains.

Abstract: Exact diagnosis of electrical submersible pump （ESP）partial friction fault may avoid magnitude economic loss. Three-dimensional vibration accelerations of ESP were measured with acceleration transducer. Since working well ESPs are deeper in the earth, vibration signals seriously fade. This paper proposed that SVM is employed as classifier and wavelet parameters as features for ESP partial friction fault diagnosis. After SVM parameters selection with grid method, the highest recognition rate is up to 86.7%. Results indicate that SVM is competent not only for small sample recognitions but also for recognitions based on faintness signal. A new method is provided for ESP partial friction fault diagnosis.

Abstract: The existing economic evaluation index system of oil-gas exploration project lacks environmental efficiency index and social efficiency index, and has no definite risk index. This paper analyzed the existing economic efficiency indexes, added the social efficiency and environmental efficiency indexes. These indexes can efficiently reflect the project’s difference, moreover, the data can be obtained easily. This paper designed the indexes, which can weight project geology risk, the project risk and the economic risk. These indexes composed a systematic and comprehensive system of oil-gas exploration project economic evaluation index. This index system can reflect the project characteristic from different angles, and provide the policy-making reference for the policy-maker.

Abstract: A novel method of minimum frequency shift keying (MSK) which based on digital signal processing (DSP) and complex bandpass processing is proposed in the article. According to the bit value of the input data, the MSK complex bandpass signal is directly produced and then is complex bandpass filtered, the real part of the complex bandpass signal is fetched to achieve the MSK modulation. The receiving signal of MSK is sampled, and then complex bandpass filtered to attain the complex bandpass signal. The complex bandpass signal and conjugate signal of its delayed version and the phase shift factor are multiplied together. According to the imaginary part of the product, the original data is recovered. The design method of complex bandpass filter is introduced also.

Abstract: The Chinese Word Segmentation technology is belonged to the category of technology of natural language management. Academies which studying Chinese Word Segmentation are mostly Research institutions such as Tsinghua University, Peking University, Chinese Academy of science, Beijing Language And Culture University, Northeastern University, Research Institute of IBM, and Research Institute of Microsoft (China), etc. Firstly, the essay analyze and compare the measurements of operation complexity and Algorithm capability of Chinese Word Segmentation in the dimension of Lucene open source’s environment, and also technologies of Chinese grammar analysis used by Chinese Academy of science. We are going to put forward the algorithm of disambiguation and matching of Chinese Word Segmentation in connected strategies based on the studying of Cloud Computing and Parallel Computing.

Abstract: The Chinese word clouds can view the Chinese documents based on users’ input or URL web sites, in accordance with the appearing frequency of words in the documents to generate a multi-state performance image, similar to the cloud images, namely, "word cloud". This system first obtains Chinese documents users view, cuts up words to the documents, then counts the frequency of each word, and finally puts the words on the appropriate framework based on the high or low word frequency, showing an effect of "word cloud". This system uses the hash algorithm making the output fonts not overlap, and generates personalized display images of Chinese word clouds, which makes users quickly understand the key information in Chinese documents and presents to users the different visual feelings.