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在许多大型企业中,包括钢铁厂,都需要用到大型的OR ACLE数据库。本文主要从大型数据库OR ACLE环境四个不同级别的调整分析入手,分析ORACLE的系统结构和工作机理,从九个不同方面较全面地总结了ORACLE数据库的优化调整方案。 相似文献
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《Research Policy》2023,52(2):104697
Climate change represents a significant problem to the planet which raises concerns from stakeholder groups about corporate commitment to climate change issues. In this paper, we explore the effect of eco-innovation and climate governance on corporate commitment to climate change. We develop a unique measure for climate change commitment by considering four components, viz. whether a company supports the Sustainable Development Goal 13 on climate action, whether a company is aware that climate change can represent commercial risks or opportunities, whether a company reports Scope 3 CO2 emissions and whether a company sets a target for emission reduction. We measure eco-innovation by using a score collected from the Eikon database that reflects a company's capacity to reduce environmental costs, eco-innovation intensity measured as environmental expenditures over revenues. We also create an index computed as a composite score by totalling five eco-innovation proxies collected from the Eikon database that reflect companies' efforts to reduce environmental impact. Concerning climate governance, we focus on three proxies, namely the existence of an environmental committee, climate incentives and the existence of sustainability reports. Based on a sample of companies listed on the London Stock Exchange for the period of 2014–2020, we find that corporate eco-innovation is positively associated with climate change commitment. We argue that firms that adopt innovative approaches to efficiently control pollution and resource use and reduce their environmental impact are more committed to climate change. We also find that climate governance is positively associated with climate change commitment. We claim that companies that integrate climate change issues in governance can help address climate change risks and opportunities. Our empirical evidence provides recommendations for managers and policymakers to promote the adoption of eco-innovative technologies and integrate climate change issues in governance, which can contribute to corporate commitment to climate change. 相似文献
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目前我国A股市场中严格以银行类上市公司有16家,通过对其中的四家公司2013年度的现金流量表进行结构分析,使用报表的数据来源于国泰安数据库,文章通过本期的现金流入、流出和结余情况,利用公式比率分析方法,选取一些指标,并对其进行估计和评价该银行的资产的流动性、获取现金能力和发展能力。 相似文献
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Ekrem Duman 《Journal of The Franklin Institute》2007,344(5):672-683
This study is based on an actual simulation application project carried out for a parcel transportation company. In its current system, the company has a wide network of branches throughout the country. Although, it is good to have a large network in terms of accessibility and increasing the business volume, performing the same operations in almost every branch is costly ineffective. Consequently, the company managers considered merging several branches in the same neighborhood and carrying out most of the tasks in these central branches. As they consulted us to see if this idea is feasible or not, we decided to use simulation modeling. After carefully investigating the details of the system we developed a comprehensive model of this dynamic and complicated system and looked at the feasibility and also the limitations of their approach. After getting the results, we noticed that what they planned would not work out and developed another central branch design that could work out. Using design of experiments we obtained the behavior of the suggested system under different business scenarios. In this study, we describe the details of this interesting application of simulation modeling. 相似文献
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数值分析研究的对象是根据数学模型提出求解的数值计算方法,是信息与计算科学专业重要的专业课,同时也是工科研究生专业必修学位课,在科学与工程计算中应用广泛。在教学中,数值分析与哲学中的方法论有相通相融之处,由此归纳出其中的一般科学方法即化归法、归纳与演绎结合法、类比推广法等,用于指导教学和学生的数学建模工作,取得了较好的效果。 相似文献
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《Journal of The Franklin Institute》2006,343(4-5):361-371
In the multiprocessor systems, scheduling is a major issue in their operation, which is also an important problem in other area such as manufacturing, process control, economics, operation research and, etc.An efficient scheduling onto the processes that minimizes the entire run time and also average of response time is vital for achieving a high performance. Solving this problem is very hard and many attempts have been made to solve the problem, using classical algorithms and intelligent methods.In fact in all researches including intelligent methods, the classical algorithm is the basic part of the solution. Even in intelligent methods, which genetic algorithm has been used, when a final chromosome is produced after some generation, a classical algorithm is used to produce an optimal scheduling based on this chromosome. In this paper a novel intelligent solution has been proposed based on genetic algorithm and chromosome background tree without using any classical algorithm. In this method the genetic algorithm presents the optimal scheduling, directly from the produced chromosome in final generation. The time of transferring data between processes is considered, and also the method not only minimizes the entire run time, but also minimizes the average of the response time of all processes. 相似文献
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针对一般情况下的物流公司车辆调度问题,建立了一个多目标下随机变量最优化的数学模型,并针对实际的物流公司数据,借助计算软件进行算例分析。 相似文献
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日常医院手术室管理最直接和最有效的方法就是进行手术排程,已研究的手术排程文献大部分是基于资源确定的情形,在实际医院运作过程中存在资源的不确定的情况,如护士的缺席,从而导致既定手术排程的不可行性,手术排程重调度可以解决资源不确定下手术排程问题。文章主要研究一天手术排程过程护士资源缺席情形下手术排程的重调度问题,建立了重调度模型,采用基于pareto解集的蚁群算法求解护士资源不确定下手术排程重调度模型。案例计算结果显示,手术排程重调度解在提高的病人满意度的同时,具有较低的手术室成本和合理的资源安排,为护士资源不确定的手术排程问题的研究提供了一种新的思路。 相似文献
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快速、合理、优化的自动排课系统设计是高校教务管理的难点。对高校自动排课系统进行了分析,提出了排课问题的约束条件,给出了系统功能设计和数据库设计。自动排课系统实现智能化、人性化的排课过程,科学地编制课程表,合理进行课程搭配,充分利用教学资源,对学校教务管理工作的完善有重要作用。 相似文献
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Holger Kollmer 《Research Policy》2004,33(8):1141-1151
We investigate licensing as a commercialisation strategy for new technology-based firms (NTBFs) in the biopharmaceutical industry using a combination of survey and database research methods. We found that most firms in our sample were not fully integrated regardless of their company age which is consistent with the picture of NTBFs as agents of technology transfer. Comparing fully and not-fully integrated firms we find differences in the use of licensing strategies. According to Ford and Ryan [Harvard Business Review 59 (1981) 117] fully integrated companies apply licensing for strategic reasons and for financially unattractive projects. Our results provide partial support for this theory. 相似文献
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指出由于缺乏全国统一的国家财政科技投入体系信息库，导致许多弊端的产生。提出了以财政资助的各类科技项目及其成果和相关专家等信息为主要内容创建全国统一的国家科学技术信息库的构想及其建设管理方案。认为国家科学技术信息库的创建有助于弥补中国现行科技信息体系所存在的严重缺陷并克服其所导致的诸多弊端。 相似文献
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创业板公司的研发投入对于构建创新型国家具有重要意义。文章利用2010-2014年77家创业板公司年报数据进行面板数据的多元回归,研究发现：公司规模与研发投入呈现“U”型关系,公司规模存在三个门限值,分别为1.027、0.468、0.068;高官工资与研发投入呈现倒“U”型关系;股权集中度、两权分离程度、公司税负均与研发投入负相关;董事会规模、公司总资产增长率、经济景气指数均研发投入正相关;上一期研发投入与本期研发投入具有显著的正相关关系,公司研发投入具有持续性特征。 相似文献
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数据库系统是当今大多数信息系统中数据存储和处理的核心。针对数据库系统的攻击将直接导致敏感与隐私信息泄露。开展数据库安全理论与技术研究,是实现数据库系统安全的迫切需求。文章通过总结与分析数据库安全的研究现状与发展趋势,认为我国在该领域与国际上的差距在不断缩小;当前既是数据库技术领域变革期,也是我国数据库安全领域研究的重要机遇期,并在此基础上提出了对策与建议。 相似文献
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分析了五金厂生产管理系统存在的必要性,并根据某企业的需求,采用SQL Server2005 Express Edition作为数据库,Visual Studio 2005做为开发工具,建立五金厂生产管理系统。 相似文献
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随着知识经济时代到来，我国经济发展模式正在从要素驱动和投资驱动阶段向创新阶段转变，创新对于实现经济可持续发展的作用越来越显著。制造业作为国民经济发展的主体，研究制造业创新的结构特征和空间格局演化，对于深化创新地理理论和优化地区经济结构有重要的意义。本文以制造业大省广东省为研究对象，从制造业创新研发和制造业创新转化两个环节构建制造业创新指标评价体系，运用三次经济普查数据，对广东省制造业创新的结构特征和格局演化进行深入探讨。本文发现：广东省大型企业的制造业创新能力高于中小型制造企业，但小型企业的制造业创新活力较强；外商投资企业的制造业创新能力最强，而内资企业中股份有限公司和有限责任公司的创新能力较好；通信设备、计算机及其他电子设备制造业、烟草制品业和黑色金属冶炼及压延加工业等行业的创新能力较强，而纺织服装、家具制造、造纸印刷等劳动密集型行业的创新能力较弱；广东省制造业创新在新产品开发环节强于基础研发环节，呈现显著的“中心-外围”格局，从业人口规模、GDP规模对广东省制造业创新有较显著的推动作用。 相似文献
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文章分析了连云港城市家具的现状与不足,通过具体案例提出了两种解决方案,一是通过海洋生物形态造型纹饰装饰城市家具,增强美感和渲染海洋特色;二是在城市家具设计中融入深厚的海洋文化内涵,从而达到外形与内涵的结合。解决了以往连云港城市家具出现的形式不美,内涵不足的问题。 相似文献
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对数据库的交叉表的实现有很多的实现方案，但是以前的实现方法不能在作为字段名称的原表中的字段数据未如时实现交叉表，本文提出的这种实现方法能解决这一情况，并结合实例介绍这种方案的具体实现。 相似文献
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本文通过对目前发电企业可靠性管理的作用及常见问题的分析,找出影响发电企业可靠性管理水平下降的主要原因。并针对存在的问题,提出合理的解决方案,为市场条件下的发电企业进行可靠性管理改进提供参考。 相似文献