基于分布式防火墙的高校校园网信息安全建设方案

对高校校园网使用中出现的安全问题,以及传统防火墙技术的不足之处进行了初步分析,并将分布式防火墙应用于校园网建设,设计了一个基于分布式防火墙的高校校园网信息安全解决方案。     

基于．NET的社区医疗健康档案系统设计与实现

探讨了社区医疗健康档案管理系统的关键技术,并利用面向对象的体系结构,构建了一个轻量级、低技术风险的面向组件的安全体系结构模型,设计了一个基于．NET平台的MVC通用开发框架,实现了高效的web开发。     

Matrix decomposition and Lagrangian dual method for discrete portfolio optimization under concave transaction costs

In this paper, the discrete mean-variance model is considered for portfolio selection under concave transaction costs. By using the Cholesky decomposition technique, the convariance matrix to obtain a separable mixed integer nonlinear optimization problem is decomposed. A brand-and-bound algorithm based on Lagrangian relaxation is then proposed. Com-putational results are reported for test problems with the data randomly generated and those from the US stock market.     

分布式认知视域下的课堂教学质量评估模式探析

从分布式认知角度,分析了教学效果与教师、学生、组织、学校、社会等多层面的关系。采用模糊综合评价法,对影响课堂教学效果的因素、构成进行实证研究,提出了一套实用性和操作性较强的评估模式。     

Multi-period model of portfolio investment and adjustment based on hybrid genetic algorithm

This paper proposes a multi-period portfolio investment model with class constraints, transaction cost, and indivisible securities. When an investor joins the securities market for the first time, he should decide on portfolio investment based on the practical conditions of securities market. In addition, investors should adjust the portfolio according to market changes, changing or not changing the category of risky securities. Markowitz mean-variance approach is applied to the multi-period portfolio selection problems. Because the sub-models are optimal mixed integer program, whose objective function is not unimodal and feasible set is with a particular structure, traditional optimization method usually fails to find a globally optimal solution. So this paper employs the hybrid genetic algorithm to solve the problem. Investment policies that accord with finance market and are easy to operate for investors are put forward with an illustration of application.     

明清时期广东田宅交易安全问题

明清时期,广东田宅交易安全大致涉及参与交易的成员、田宅交易的前提条件、所交易田宅的情况、契纸和价款交付的情况、出卖人的保证、签订卖契的日期及签押、投官税契及税粮过割等内容,每一个环节出现问题,都有可能给田宅交易安全带来风险。田宅交易安全决非仅仅通过官方力量维持,民间力量也参与其中。     

诚实信用原则的经济功能

诚实信用原则在市场经济中具有极为重要的经济功能,它对市场主体的交易行为可以产生多方面的经济影响。诚实信用原则的经济功能主要体现在规范交易行为、降低交易成本、提高交易效率、保障交易安全、维持交易公平。     

基于．NET Remoting三层分布式信息管理系统的设计与实现

以一个房地产中介管理系统设计为背景,探讨了基于．NET Remoting三层分布式的信息管理系统设计的过程和相关思路,说明了使用Remoting技术可以非常便捷地构建分布式的信息管理系统。     

新型原料奶生产组织形式“奶联社”的经营模式探讨

中国原料奶生产效率滞后的根本原因在于奶牛饲养技术落后,而饲养技术的提高必须通过原料奶生产组织形式的改变来实现。笔者在介绍和分析奶联社模式的基本机制基础上,结合奶业及中国奶业的特质,利用比较分析的方法,从经济规模效应、内生交易费用等理论角度对奶联社模式是适合提高中国奶牛饲养技术和提高中国原料奶品质和生产效率的最佳原料奶生产组织形式进行了论证和分析。最后对如何推广奶联社模式进行了探讨。     

(Un)Critical times? Situating distributed leadership in the field

It is time to situate distributed leadership as a critical conceptualisation of school leadership; its popularisation has generally preceded conceptual and empirical development. Over the last 10 years distributed leadership has often been presented as a new construct of school leadership, though critique against education policy reforms and conceptual and historical links to the wider leadership field have generally been underemphasised. The theorisation and research of distributed leadership is currently situated at a critical point in its development; it is at the ‘crossroads’ of where it could dominantly be situated in the field of school leadership. A review of the literature and research suggests that distributed leadership is tending towards an uncritical position that is decoupled from critique of past and present education reforms and predominantly silent on how power relations at the local school level shape leadership activity.