浅析信息不对称对我国农产品市场的影响及对策

中国经济社会发展最大的问题是"三农"问题,"三农"问题的核心是农民问题,而农民问题的核心是农民增收问题。增收就需要完善的市场体系,所以农产品市场体系的建设就成为现阶段我国经济建设中最重要的环节。但是,在这一过程中却存在着一个尤为突出的问题——信息不对称问题。这就使得我国经济的发展严重受到了约束,如何解决农产品市场信息不对称问题便成为我国经济建设的当务之急。     

Method of Homomorphic Encryption

The existing homomorphie eneryption scheme is based on ring of the integer, and the possible operators are restricted to addition and multiplication only. In this paper, a new operation is defined Similar Modul. Base on the Similar Modul, the number sets of the homomorphic encryption scheme is extended to real number, and the possible operators are extended to addition, subtraction, multiplication and division. Our new approach provides a practical ways of implementation because of the extension of the operators and the number sets.     

鱼腥藻毒素合成中间体的不对称合成

报道(一)-AnTx-a关键中间体的四步合成新途径,设计一个新型(一)-AnTx-a类似物并以同法合成其中间体,本法是对以Mannich反应为基础的AnTX-a的合成策略的补充。     

反跟踪技术与软件加密的相关性

通过分析反跟踪技术方法，阐述了反跟踪技术与软件加密的相关性。     

Х—满射环上正交变换的分解

在２是单位的Х－满射环Ｒ上，以拟对和称为生成元，给出正交变换的分解方法，并估计了分解因子的最少个数。     

Principal component analysis using neural network

The authors present their analysis of the differential equation dX ( t )/dt = AX ( t ) - X^T( t ) BX( t)X( t), where A is an unsymmetrical real matrix, B is a positive definite symmetric real matrix,X E Rn ; showing that the equation characterizes a class of continuous type full-feedback artificial neural network; We give the analytic expression of the solution; discuss its asymptotic behavior; and finally present the result showing that, in almost all cases, one and only one of following eases is true. 1. For any initial value X0∈R^n, the solution approximates asymptotically to zero vector. In thin cane, the real part of each eigenvalue of A is non-positive. 2. For any initial value X0 outside a proper subspace of R^n,the solution approximates asymptoticaUy to a nontrivial constant vector Y( X0 ). In this cane, the eigenvalue of A with maximal real part is the positive number λ=Ⅱ Y (X0)ⅡB^2 and Y (X0) is the corre-sponding eigenvector. 3. For any initial value X0 outsidea proper subspace of R^n, the solution approximates asymptotically to a non-constant periodic function Y( X0 , t ). Then the eigenvalues of A with maximal real part is a pair of conjugate complex numbers which can be computed.     

利用加密和数字签名技术实现安全收发电子邮件

数据加密是保证远距离通信中实现数据安全传输的基础。阐述了数据加密、解密、数字签名等技术，并介绍了如何在Microsoft outlook express中对电子邮件进行加密解密。     

喇嘛甸油田北北块二区萨Ⅲ4-10厚油层综合调整方法研究

本文从喇嘛甸油田厚油层开发特点入手,通过对北北块二区厚油层的井网加密调整、选择性射孔后,初期取得了一定的效果。但是,随着开采时间的延长,区块存在低效井比例多、注采比低、含水上升快等问题。针对上述问题,采取了行之有效的精细调整方法,取得了一定的效果,为喇嘛甸油田的厚油层加密调整提供了依据。