Application controlled caching for web servers

Today's web servers must have the ability to deal with large data sets, and their performance mainly depends on the control mechanism of the disc cache. Though the cache replacement algorithms in operating systems generally perform well, application-specific policies can often perform much better. In this paper, we present the application-controlled caching in user space (ACCUS) mechanism for web server disc caching. With this mechanism, an application can schedule the service requests based on the cache status of the requested files to improve its performance so that the system can gain a high parallelism of CPU processing, networking I/O and disc I/O. An application can service the cached files with a higher priority to the ones not cached, which helps reduce the latency caused by disc I/O blocking. Meanwhile, the application can enforce a policy for domain-specific cache management to obtain a higher cache hit ratio. ACCUS is implemented in two web servers of different models, Flash and userver. Despite the great differences in architectures, the empirical results show that both servers can achieve high throughput under heavy workloads with ACCUS enabled. Performance analysis for two other typical web servers, Apache? and Zeus Web Server are also conducted and the results indicate that ACCUS can achieve significant improvement in performance.     

组合式磨铣工具的研制与应用

本文通过现场分析研制了组合式磨铣工具,该工具结构简单,把铣锥、铣鞋、扶正器有机地组合在一起,包括磨鞋、磨铣、导向三大部分,完井过程中一趟钻即可完成三趟施工作业要求,该工具在桩西和孤岛地区桩205-平5及南38-平201井水平井施工中推广使用,结果表明大大缩短了建井周期,取得了很好的经济效益,具有良好的推广前景。     

探讨绳索取芯钻具的加工工艺改进

为了保障在进行煤田的地质勘探当中的安全性和稳定性需求,要求不断的改进绳索取芯钻具的有关工艺。主要从材料、加工程序等方面进行改进,以最大限度的提高其使用寿命,保障其强度达到有关要求。以下主要针对其技术性能、改进方式等进行了分析。     

Extension,advice and knowledge systems for private forestry: Understanding diversity and change across Europe

The decisions and actions of private forest owners are important for the delivery of forest goods and services. Both forest ownership, and policies related to forest owners, are changing. Traditionally in most countries, government extension officers have advised and instructed forest owners, but this is evolving, with greater importance given to a range of actors, objectives, and knowledge types. Drawing on literature and mixed data from 10 countries in Europe, this paper explores how forestry advisory systems can be conceptualized, and describes their current situation in Europe. Drawing parallels with the concept of AKIS (Agricultural Knowledge and Information Systems), we propose the term FOKIS (FOrestry Knowledge and Information Systems), as both a system (a purposeful and interdependent group of bodies) and a method for understanding such systems. We define four dimensions for describing FOKIS: owners, policy goals, advice providers, and tools. We find different roles for extension in countries with centrally controlled, highly regulated forest management, and advisors in regions where forest owners have more freedom to choose how to manage their forest. We find five trends across Europe: increasing flexibility, openness and participation of owners as sources of information; increasing reliance on information and persuasion rather than enforced compliance; a shift of attention from timber to a wider range of ecosystem services such as biodiversity and recreation; a shift of funding and providers from public to private sector; emergence of new virtual communication tools. The approach provides a way to make sense of comparisons and change in FOKIS, and opens up an important research field.     

Discussion of Environmental Finance

Environmental finance is a recently coined term,one that probably could not have appeared until the closing moments of the twentieth century.It encompasses all market-based instruments designed to deliver environmental quality and to transfer environmental risk.It signals a radical change of direction in the way that modern industrial society has approached environmental challenges in the past.     

数控机床电气控制系统的故障诊断与维护

数控机床电气控制系统是数控机床机电一体化的主要组成部分,本文主要阐述了数控机床电气控制系统故障的诊断检测,电气系统故障的排除方法和数控机床电气控制系统的预防性维护等问题。     

How Useful Are the Strategic Tools We Teach in Business Schools?

Strategic tools are indispensible for business and competitive analysis. Yet we know very little about managers' internal logic as they put these tools into practical use. We situate our study in a business school context using action learning prior to the manifestation of practice to complement our understanding of practice. Using Personal Construct Theory and Repertory Grids, our mid‐range theorizing showed that, contrary to current thinking about strategic tools, managers think in dualities (often paradoxically) and have a preference for multiple‐tools‐in‐use, tools that provide different perspectives, peripheral vision, connected thinking, simultaneously help differentiate and integrate complex issues, and guide the thinking process. These findings are important for designing better tools and the nurturing of critical managerial competencies needed for a complicated world. Our study's focus also has wider implications for scholars as we see our own material evaluated by those who will put these lessons into practice.     

试论“私募基金”在我国的发展

私募基金作为一种投资工具在我国还尚未正式出现 ,而是以各种形式存在于地下。必须对私募基金进行常识性的介绍、分类和比较 ,才能看出私募基金的规范和健康发展对我国经纪业、证券业、资本市场乃至整个国民经济产业结构具有深远影响。并且显示出私募基金的存在是资本增殖内在要求这一主题。可以说私募基金的发展具有历史必然性和现实迫切性     

研究生党建创新的SWOT分析及策略选择

文章从新时期研究生党建创新的重要性出发,用SWOT方法全面系统地分析了现阶段创新研究生党建具有的优势和劣势、面临的机会和威胁,并在此基础上进一步探讨了研究生党建创新的策略和措施问题。     

Intelligent tools and techniques for modern management

In order to make decisions all companies need information. As a rule, all the informatics systems of a company contain a multitude of data and turn these data into information that has to be analyzed in order to make decisions. It is a slow process. The solution of this drawback is given by Business Intelligence （BI） applications that can help companies increase income or diminish costs by offering the executive management appropriate information on the basis of which quick and efficient decisions can be taken.
The main purpose of the paper is to prove the necessity that BI tools should be used by the modem manager. Managers are aware of that by putting into practice the BI solutions, opportunities of getting control over the business process and methods are improved and better, timely analysis functions of the performance parameters can be obtained.