In view of the problems of difficult establishment of effective displacement system and poor effect of water drive in Chang 8 reservoir of C335 area of JY oilfield, the reservoir development effect was evaluated comprehensively by reservoir pressure change, water drive law and effect characteristics. On this basis, combining with reservoir engineering and numerical simulation, this article formulated reasonable exploitation policy. The optimum injection⁃production ratio was 2.0, the flow pressure was 6.0 MPa, and the production rate was 0.7%. Finally, by comparing and forecasting the three schemes, the comprehensive scheme was the best.

In order to better deal with the oily sludge produced in the process of oil production, gathering and transportation as well as oil refining, and in line with the current development trend of environment⁃friendly chemicals in the petrochemical industry, it is very important to use environmentally friendly and low toxic and non⁃toxic chemical reagents in the neighborhood of sewage treatment. This paper introduces a new cleaning agent for oil sludge. Compared with the traditional cleaning agent, the new cleaning agent uses natural chemical derivatives (environmental friendly plant solvent is the main component), which has the characteristics of low toxicity, low pollution and high cleaning efficiency. The use temperature is 5~10 ℃ lower than the field use temperature, further reducing the use of energy. Under the synergism of composite cleaning agent, the residual oil rate in the cleaned sludge can be less than 2%, which has a wide and excellent application prospect.

Credit risk management is an integral part of banking business. By modifying the standard Markowitz model, the paper aims to study optimum credit portfolio with binary variable, which decides whether providing loads. The model can evaluate the cumulative risk and returns by considering the asset correlation and whether providing loads in the prospective of influencing risk indicators and profit rates. It enforces the empirical research of optimum portfolio by using the proposed model in this paper and the statistics offered by Standard & Poor's rating agency.

The main contribution is to present stability analysis criterion for a type of norm⁃bounded uncertain perturbed discrete systems(NUPDS) with its states is subjected to a novel ellipsoidal outer approximation,which is different from the traditional bound description of general state. Based on the Lyapunov method, a delay dependent criterion and the corresponding state feedback control law, which are expressed in terms of linear matrix inequalities(LMIs) technology, are proposed to guarantee the asymptotic stability for the perturb delay systems. The solution of the LMIs can be obtained easily using existing efficient convex optimization techniques. A numerical example is given to illustrate effectiveness of the proposed method.

Reconstruction of rippedup documents was important for judicial authentication，cultural relic reconstruction and military information acquisition，etc．An approach for the reconstruction of regularly rippedup documents was proposed. Firstly, the line spacing of the fragments was automatically extracted. Secondly, meanshift algorithm was adapted to cluster all the fragments. Thirdly, for each cluster, the similarity matrix was constructed based on the grayscale of the edges of the fragments. Lastly, the document with genetic algorithm was reconstructed.Reconstruction of rippedup documents is important for judicial authentication，cultural relic reconstruction and military information acquisition，etc．In this paper，we propose an approach for the reconstruction of regularly rippedup documents. Firstly, the line spacing of the fragments is automatically extracted|Then meanshift algorithm is adapted to cluster all the fragments|Then for each cluster, the similarity matrix is constructed based on the grayscale of the edges of the fragments|Lastly, we reconstruct the document with genetic algorithm.

Embedding and extracting algorithm for watermarking in the frequency domain based on the Fresnel and Fourier Hologram was proposed. The image watermarking was restored from the JPEG images with different compression ratios and the stability of watermarking image was compared between two different transformations. The result show that the image watermarking obtained by the proposed algorithm had perfect imperceptibility and stability. By comparison, however, the one based on the Fresnel Hologram had superiority in terms of stability.

A second-order nonlinear neutral delay differential equation was studied, and some sufficient conditions for existence of positive solutions for this equation were established. The advantage of the results is omitting the restriction condition of for any， must be negative. Furthermore, some examples were presented to illustrated that the results is more effective.

The higher-order moment of sum of independent and identically distributed exponential random variables was investigated. The higher-moment of exponential random variable was computed by mathematical induction method. Base on this result, combining the multinomial theorem and the knowledge about the partition of integer in combinatorics, the higher-order moment of sum of independent and identically distributed exponential random variables was computed and the computation formula was got. At last, the conclusion was illustrated by numerical example.

Let A=(a _ij)∈C ^{n ×n}, if there existsα∈(0,1) [WTBZ]which can make |a _ii|≥R ^α _iS ^{1- α} _i be right for i∈N={1,2,…,n},then  is called anα-chain diagonally dominant matrix.It gave an equivalent condition for chain strictly diagonally dominant matrices，and obtains a necessary condition for a matrix to be a nonsingular H-matrix indirectly. The result obtained improves the known corresponding results．At last, some numerical examples are given for illustrating advantages of the result.

 

 

 

Some iteration methods for solving linear system were studied，when coefficient matrix is α-diagonal strictly dominance or doubly diagonal strictly dominance, and some convergence theorems were given. Results obtained were applicable to α-diagonal strictly dominance matrix or doubly diagonal strictly dominance matrix, and improved the known results and were suited to extended matrices. Finally, an numerical examples were given for illustrating advantage of results．

 

Nowadays, the procedure of IP fragments and TCP flows serial reassembling technology have not been satisfied with the high speed network requirements. Meanwhile, every whole conversation in the network is almost similar from each other. Little distinctions exist among protocols of different application layers. It is suitable for adopting parallel reassembling algorithm. A parallel reassembling algorithm in application layer was introduced. Through this method, the balance of IP fragments and TCP flows reassembling was distributed reasonably in parallel reassembly process. A two-dimensional linked list was used to save key information. Too heavy work load of NIDS was avoided. An example of SMTP protocol was analyzed thoroughly．At last, in the light of the weakness of original algorithm，an improved algorithm was put forward. The whole mission was distributed in parts and computing ability of each node was fully used. So the parallel reassembling was reached. The test result shows that the improved algorithm is much more efficient than that of the original algorithm.