VB程序的调试方法及常见错误的捕获处理

本文阐述了VB的常见错误类型、常用调试方法及错误捕获方法,并在此基础上给出了利用错误捕获技术进行处理时的实例。     

WITNESS环境下的服务系统仿真建模

阐述了服务系统建模的特点，在WITNESS环境下，建立了某票务中心的仿真模型，通过仿真试验比较了两种人员配置的方案，分析了系统瓶颈，给出了改善后的仿真结果     

车辆监控系统在智能交通系统中的应用

介绍了自动车辆定位系统、车辆监控系统和智能交通系统的基本概念，并给出了自动车辆定位系统的两种类型及车辆监控系统的组成和它在智能交通系统中的应用。     

供货频次和需求配比视角下的供应链最优价格决策

以供货频次和需求配比为视角,构建了一个供应链动态博弈模型,研究了在需求方为先决策者和供应方为先决策者两种情形下供应链系统的最优价格决策机制,分别给出了两种情形下的最优价格决策方案,指出产品是最优价格决策中的根本性影响因素。     

再制造系统生产计划研究的现状与展望

首先给出了再制造系统的一般框架,总结了影响再制造生产计划制定的不确定性因素,进而通过借鉴企业资源计划系统的计划框架给出了再制造系统生产计划的一般层次结构,从研究问题和研究方法两个方面总结了再制造系统生产计划的研究成果,最后指出了进一步的研究方向。     

风险投资非系统风险的模糊评价方法

在对影响风险投资项目风险的因素进行分析的基础上，建立了一套涉及市场风险和代理风险两个方面的风险投资项目非系统风险的评价指标体系；针对投资风险的综合评价问题，给出了一种模糊评价方法。     

基于4PL的物流系统成本节约及效益分配研究

基于第四方物流独立运作的组织模式,本文构建了物流系统运行的成本与效益模型,研究了第四方物流带来的成本节约和效益提升问题,分析了第四方物流组织的效益分配方式,给出了第四方物流作为盈利或非盈利组织的两种效益分配方式及其分配比例范围。     

基于产业创新系统的创新驱动发展案例研究

基于产业创新系统理论,提出了SASD创新要素分析和IPPI创新发展四阶段模型两种分析方法,从静态和动态两个维度定性描述了产业创新驱动发展的影响效果,运用IPPI创新发展四阶段模型对北京市2001-2013年产业创新驱动发展现状和问题进行分析,并给出了相关对策建议,实例分析结果验证了该模型在实际研究中的可行性。     

应用级数据库入侵检测系统的总体框架

本文设计了一种应用级数据库入侵检测系统的总体方案.基于现有数据库应用系统的主要特点,结合入侵检测思想、数据库中用户操作的特点以及行为特征,给出了一种应用级数据库入侵检测系统的框架结构.     

技术创新系统的耗散特征及其非均衡扩散研究

从系统论角度给出了创新的一种新定义及其系统学特征,阐述了技术创新系统的耗散特性、系统涨落的动力因素、非均衡的扩散及技术创新产业化形成的过程。     

An economic-ecological model of urban growth and urban externalities: empirical evidence from Italy

The importance of urban size for urban sustainability is well known; it plays an important role in the possibility of shaping the quality of urban living conditions. For this reason, it is important to study urban dynamics in connection with the issue of environmental quality. Moreover, awareness of the existence of cyclical patterns in urban dynamics, which we stress in this paper, can be useful for the formulation of environmental policies enabling a steady state equilibrium to be reached in terms of sustainability by flattening out the cyclical waves. A number of more quantitative models for the interpretation of urban growth has been provided; these models are related to the well-known ecological prey-predator model of Lotka–Volterra, and provide a good interpretative framework of the territorial phenomena, characterised by strong feed-back mechanisms. Recently, a pure economic model, linking the per-capita income and the urban rents has been suggested as a possible interpretative model of urban growth which is characterised by two main advantages: (a) its capacity to overcome some of the limits of the previous prey-predator models, like the necessity to apply the concept of an urban carrying capacity; (b) its pure economic feature. The present paper presents the model and the logic behind it and provides an empirical analysis of the model based on the Italian case. An econometric model is presented on the relationship between urban population growth and urban rent, based on a database of 95 Italian cities in time series from 1963 to 1996; the feedback mechanisms between the two variables emerge. This work represents the first attempt to provide an estimate of the prey-predator model based on real data.     

The economics of harvesting predator-prey systems

The economics of harvesting a renewable natural resource is well-developed in a framework where environmental conditions of the species looked at are kept constant. For the case of two interacting species as a prey-predator relationship the economics of harvesting one of the two species is analyzed. Questions of existence, uniqueness, and stability are looked at. Applying optimal control theory, a modified golden rule of harvesting is derived.     

Ill-behaviour of transformation-frontiers with environmental quality versus pollution

If one looks at environmental quality N as a renewable natural resource (with its own natural dynamics) which is changed by emissions Z, then one gets a better understanding of the shape of the damage function. In the case of a logistic growth dynamics one obtains a well-shaped transformation frontier N(Z), even in a two-species natural dynamics. For a more general natural interaction in the framework of a prey-predator model one obtains the possibilities of a cusp catastrophe which makes the transformation frontier N(Z) ill-shaped for the standard arguments of economists and their most favoured environmental policy instruments.     

Innovation, cycles and growth

The purpose of this paper is to present a model of growth with endogenous fluctuations. The main feature of our model is that it throws light on the relationships between long waves and business cycles in the economy. The driving forces in the model work in this way: endogenous R&D investment creates new cumulative knowledge. When this knowledge reaches a threshold H*, radical innovations occur which generate productivity growth via the substitution of old capital with new capital. These disruptive events appear recurrently, generating long waves and revitalizing the growth process. Short-term cycles in the model come from the interactions between these innovation-driven transformations and certain prey-predator mechanisms that involve the labor market. We find that our model presents excellent properties: the model generates endogenous cyclical growth as a disequilibrium process; persistent and irregular short cycles appear interwoven with the long waves; and there is a strong significant interaction between both kinds of fluctuations.     

Modeling population dynamics and economic growth as competing species: An application to CO2 global emissions

Since the beginning of the last century the world is experiencing an important demographic transition, which will probably impact on economic growth. Many demographers and social scientists are trying to understand the key drivers of such transition as well as its profound implications. A correct understanding will help to predict other important trends of the world primary energy demand and the carbon emission to the atmosphere, which may be leading to an important climate change. This paper proposes a set of coupled differential equations to describe the changes of population, gross domestic product, primary energy consumption and carbon emissions, modeled as competing species as in Lotka-Volterra prey-predator relations. The predator-prey model is well known in the biological, ecological and environmental literature and has also been applied successfully in other fields. This model proposes a new and simple conceptual explanation of the interactions and feedbacks among the principal driving forces leading to the present transition. The estimated results for the temporal evolution of world population, gross domestic product, primary energy consumption and carbon emissions are calculated from year 1850 to year 2150. The calculated scenarios are in good agreement with common world data and projections for the next 100 years.     

Competitive diffusion of personal computer shipments in Taiwan

In this work, we explore the innovative growth of personal computer (PC) shipments from Taiwan. Using a revised Lotka-Volterra model, we estimate marketing diffusion by considering competition between desktop computers (DTs) and notebook computers (NBs). The parameters in the Lotka-Volterra model are calibrated with realistic shipment data by using ordinary least square estimation. The time trajectories of DT and NB shipments are then obtained numerically. We analyze the dynamic process of competitive relationship between the shipments of DTs and NBs. Comparisons between the well-known Bass growth model and the revised Lotka-Volterra model are also drawn. In addition, we also make an equilibrium analysis to see the character of the corresponding equilibrium point. Our research shows that there exhibits a prey-predator relationship between DT and NB products from the viewpoint of ecology. In management implication, we show how the competing interplay among the three factors of natural growth, niche capacity and interaction drives the growth of products of DTs and NBs. We also find that there exists a stable equilibrium state showing the growth-decline-plateau type of product life cycle for both DT and NB products from Taiwan, and giving an interpretation of migrating their manufacturing operations to Mainland China.     

Legal systems and performance of microfinance institutions

The paper investigates the impact of institutional environment resulting from the legal systems, on the financial performance of microfinance institutions (MFIs). Broadly categorized into common law and code law, the legal systems are found to significantly influence the efficiency of MFIs. We use an unbalanced panel of 1272 MFIs over a period of 16 years to analyze the effect of legal systems on their financial performance. In contrast to the accepted notion that common law systems are more conducive to effective market systems, our results show that MFIs operating under code law systems exhibit better financial performance than in common law systems.     

Public or Private Orientation of Pension Systems in the Light of the Recent Financial Crisis

This paper studies the appropriateness of a public or private orientation of pension systems in the light of the recent financial crisis, which has underscored the difficulties and contradictions associated with each system. The different institutional arrangements, in which public or private pension systems are embedded, are key components when assessing their responses to the crisis. Particularly, private pension systems are intertwined with financial markets, while social insurance-based pension systems are linked to the labour market mechanisms. This paper compares the British and French pension systems, as “archetypes” of private-oriented and public-oriented systems, respectively, the first relying on the market and private pension schemes, and the second on mandatory social insurance. This paper shows that the crisis has upheld the founding principles of the public (French) and private (British) pension systems to maintain the existing institutional configurations. At the same time, both systems have strengthened the role played by means-tested benefits and minimum pensions for low-income groups to offset the weaknesses of one or the other system, as emphasised by the crisis.     

基于MIMO阵列的综合射频系统技术研究

综合射频系统集雷达探测、数据通信和电子干扰等多种功能为一体,显著提升武器平台在复杂战场环境下的生存能力和作战效能,是武器装备的重点发展方向。针对现有综合射频技术难以高效同时实现多功能等不足,提出构建基于多输入多输出(multi-input-multi-output, MIMO)阵列的综合射频系统。研究结果表明,通过充分利用MIMO阵列的空间自由度和波形自由度,基于MIMO阵列的综合射频系统能够同时实现多功能。将系统探测通信性能、反侦察抗干扰能力、兼容性等方面与传统综合射频技术进行对比,表明基于MIMO阵列的综合射频系统具有独特优势。对基于MIMO阵列的综合射频系统关键技术进行了梳理分析和展望。     

Adjustments in Different Government Systems

This paper develops a model in which agents have a conflict of interest over what instrument to use for policy adjustment in response to shocks. Three different government systems are analyzed: cabinet systems, in which one decision-maker has full control over adjustment policies; consensus systems, in which adjustment policies must be agreed upon by all agents; and checks-and-balances systems, in which one agent decides what instrument should be used for adjustment, but the remaining agents may veto its use. All three systems may lead to inefficient policies. The cabinet system adjusts too often. The other systems may fail to adjust when adjustment is optimal. The relative performance of the three systems depends on the degree of political fragmentation and the size distribution of shocks.