基于Sentinel-2的闪电河流域农作物分类研究

以内蒙古闪电河流域为研究区,基于Sentinel2光学遥感影像结合随机森林和支持向量机算法,采用3种方案:基于像元的分类方法、面向对象的分类方法及改进的基于像元分类与面向对象分割相结合的集成方法,对研究区内的农作物进行精细提取.结果表明:①基于随机森林采用基于像元的方法进行分类,所有地类的总体精度为97.8％,Kapp...     

IBRAC技术在分布式虚拟仿真系统中的应用研究

基于图像的方法和基于模型的方法是生成虚拟场景的两种方法,但这两种方法在分布式虚拟场景的生成过程中各有优缺点。将两种方法的优点相结合,在分布式虚拟仿真系统中引进IBRAC技术,有三个优点：绘制速度快、网络带宽限制低、能够进行交互控制。该文结合分布式门式起重机虚拟仿真培训系统对IBRAC技术进行了研究。首先给出了该系统的总体结构,然后分析系统中用到的IBRAC技术重要算法,最后对IBRAC技术在系统中的应用前景进行了展望。     

结合多分类器的遥感影像分类方法研究

以提高遥感影像分类精度为研究目的,以Matlab 7.0作为实验平台,利用7种单分类器分别在测量级和抽象级上进行多分类器结合的方法研究,并进行实验验证。其中针对在非监督分类中后验概率计算时的类别中心确定问题,本文在分类结束后重新计算各个类别特征的平均值作为类别中心。本文还对投票法进行了改进,通过比较各个类别后验概率之和的方法解决多个类别同时为得票最高类别时的像元类别归属问题,并对实验结果进行精度评价和分析。结果表明多分类器结合方法对单分类器的总体分类精度有一定程度的提高。     

县域城镇用地信息提取研究——以福建省长汀县为例

针对如何快速、准确地获取县域城镇用地的信息问题,该文以2010年的TM影像为数据源,以典型的山地城市福建省长汀县为研究区,比较和分析常用的城镇用地提取方法的优势和不足;借鉴分层分类法的思路,综合运用归一化植被指数结合地形调节植被指数、多波段谱间关系法结合改进型归一化水体指数、归一化裸土指数结合归一化不透水面指数,对长汀城镇用地进行提取,总体精度超过85%。分析表明该方法是一种可行有效的城镇用地提取方法。     

石油企业ERP系统运用中的问题与对策

石油行业对我国的国计民生影响重大,但总体来说,我国的石油企业普遍管理水平较低,要通过有效的管理手段、工具和方法来提升总体管理效能,引入ERP就是一种比较好的解决办法。但是,ERP的实施要在一定程度上结合我国石油企业的实际,如果不能契合,那么就可能会出现一些"水土不服"的现象,本研究的主要目的就是研究这些不足,并提出针对性的改进措施。     

基于木马技术的网络渗透测试研究

目前,国内网络渗透测试的自动化程度不高,效率较低,鉴于此,结合木马的隐蔽性、自启动性、自动恢复性以及易植入性的特点,提出一种利用木马进行网络渗透测试的设计思想。对测试系统的总体框架进行研究和设计,并对实现过程中的关键技术进行探讨与研究。     

半导体封装测试生产线排产研究

以某半导体封装测试（Semiconductor assembly and test manufacturing,ATM）企业为研究背景,对半导体封装测试的生产过程进行分析总结,提出一种新的“产能限定混线车间”（Capacity-limit flexible flow-shop,CLFFS）模型作为半导体封装测试生产线的排产模型.通过对半导体封装测试的特殊逻辑处理、排产方法以及排产规则等进行研究,提出采用逻辑约束和调度规则双层优化控制的启发式正序排产算法作为半导体封装测试的总体排产方法,同时针对批准备单处理生产阶段,提出一种新的预测开机控制优化调度方法.最后,结合CLFFS排产模型和所提出的策略方法,给出半导体封装测试排产的应用研究示例与比较,结果证明本文给定的总体排产方法在ATM中具有很好的可行性和业务逻辑嵌入的即便性,同时本文所提出的新的预测开机控制优化调度方法能够很好的缩短生产周期,提高生产效率.     

尺度总体最小二乘在图像拼接中的应用

图像拼接是是一种重要而实用的计算机技术,好的拼接算法离不开鲁棒的参数估计方法。尺度总体最小二乘方法作为一种新的线性模型参数估计方法,它是最小二乘,数据最小二乘与总体最小二乘方法的直接推广与统一体,具有良好的估计性能。考虑到观测数据中外点的存在将可能导致参数估计失效,我们首次将RANSAC方法与尺度总体最小二乘结合起来用于图像拼接问题,实验表明,该方法具有优良的性能,值得推荐。     

玉米大面积田间测产研究

本研究结合近20亩玉米空白试验,通过不同抽样方法,进行了玉米大面积田间测产的研究与探讨。本文引述了已故谭启栋教授提出的典型众数抽样的理论依据和方法步骤。这一方法不仅在林业上适用,而且在农业方面起到同样作用。试验结果表明,典型众数抽样较同时同地进行的随机抽样平均亩产量更接近空白试验所测得的每亩平均产量。从亩产总体平均值95%的置信范围看,典型众数抽样亦较之随机抽样为精确。即使两种抽样方法结果相近似,但典型众数抽样在布点、经费、人力及时间等方面比随机抽样为少,仅及随机抽样的3/5与3/20。本文通过统计估计与分析阐述了典型抽样的误差小于同大小的随机抽样,且是最能代表总体的抽样。最后论述了典型抽样的必要性,并且结合农业生产的特点,提出了改进这一方法的设想。     

一种面向对象的专家系统设计方法

近年来,已经有不少面向对象技术运用于专家系统的研究。该文提出一种新的面向对象专家系统的设计方法。首先介绍系统总体结构,给出知识表示模型和推理机制,并且引入RMG的概念,进一步提出运用RMG完成推理过程的算法。最后把提出的方法应用于中西医结合糖尿病诊疗专家系统的开发。实践证明此方法是有效的。     

Harnessing business analytics value through organizational absorptive capacity

Business analytics (BA) is a resource-intensive, risky endeavor. However, the literature has not addressed the important question of how to assimilate BA technologies for competitive advantage. We build a research framework and outline the BA assimilation mechanisms through organizational absorptive capacity (AC). Data were collected from 600 companies across six countries and analyzed using partial least squares. The findings revealed that organizational AC plays a crucial mediating role between BA competency and BA assimilation, leading to competitive advantage. This study contributes significantly to both information technology assimilation and BA value research by incorporating the role of organizational AC.     

Streams of digital data and competitive advantage: The mediation effects of process efficiency and product effectiveness

Firms can achieve a competitive advantage by leveraging real-time Digital Data Streams (DDSs). The ability to profit from DDSs is emerging as a critical competency for firms and a novel area for Information Technology (IT) investments. We examine the relationship between DDS readiness and competitive advantage by studying the mediation effect of product effectiveness and process efficiency. The research model is tested with data obtained from 302 companies, and the results confirm the existence of the mediation effects. Interestingly, we confirm that competitive advantage is more significantly impacted by IT investments affecting product effectiveness than those affecting process efficiency.     

融合先后手优势的竞技水平估计算法

针对传统的基于概率图模型的竞技水平估计算法忽略了先后手(主客场)优势从而影响估计精度的问题,提出一种融合先后手优势的竞技水平估计算法。该算法在竞技水平估计算法的图模型上,引入先后手节点,将先后手优势与选手真实竞技水平融合;然后利用比赛结果,采用贝叶斯学习的方法同时估计选手的真实竞技水平和先后手优势;最终根据估计结果对比赛进行预测。在两个真实比赛数据上的对比实验〖BP(〗原文“试验”〖BP)〗表明,相对于没有融合先后手优势的估计算法,该方法能够明显提高竞技水平估计的精度。     

Information technology for collaborative advantage in healthcare revisited

Interorganizational systems are expected to provide opportunities for various stakeholders, often competitors, to collaborate. At the moment, there is a great need for research evidence on the factors facilitating or impeding the achievement of collaborative advantage between interorganizational systems stakeholders. A recent contribution has been the use of a health-information network case to derive lessons for policy makers in this respect. The development and use of the NHSnet in the United Kingdom provides an opportunity to review these lessons in a different context of health-information exchange. Combined with the use of stakeholder analysis, these lessons can enhance our understanding of the context, the stakeholders involved and affected by the network, their interests and their perceptions of collaborative advantage. It, therefore, provides useful insights in the lessons that healthcare policy makers can apply in the development and use of a collaborative network. Further theoretical and practical research is, however, needed to improve our understanding of success and failure factors for the achievement of collaborative advantage in different environments.     

Where’s the competitive advantage in strategic information systems research? Making the case for boundary-spanning research based on the German business and information systems engineering tradition

During the last decades, strategic information systems (SIS) research has become an influential stream within the information systems discipline. The success story of the Journal of Strategic Information Systems provides strong evidence. Yet, we believe that there is still a lot of untapped potential in the interaction of SIS research and industry. Put bluntly, it is impossible that results of SIS research are publicly available, reconstructable by subject matter experts, and valid beyond the single or very few cases and at the same time constitute the foundation of competitive advantage. We argue that SIS researchers need to become boundary spanners who actively engage in industry collaboration to help create competitive advantage and who disseminate their insights later on to advance the scientific knowledge base. We outline challenges of boundary-spanning SIS research and provide some ideas and recommendations. Wherever sensible, we draw on our experiences from the traditionally strong industry collaboration of the business and information systems engineering community from the German-speaking countries.     

IT outsourcing in insurance services: risk, creative contracting and business advantage

Abstract. Risks in IT outsourcing have received little systematic academic attention, despite growing evidence of wide disappointment and difficulty as well as some successes in outsourcing IT. This paper explores the 1993–98 case history of Polaris, a software intermediary in the European insurance sector. Despite the considerable risks inherent in outsourcing business-critical technology, Polaris was found to be achieving business advantage from such a strategy. This paper details 10 major risk areas in IT outsourcing distilled from previous research. It focuses on the sourcing, contractual and management choices made at Polaris. It assesses, against prior research findings, the degree to which these choices mitigated short- and long-term risk, and whether learning points flow from the analysis for other IT outsourcing arrangements.     

模糊网络中基于指数的评估函数研究

结合模糊网络环境特征,提出了在全局网络中遍历服务异常（QoS）的目标的评估函数。该函数的实施,首先 通过建立节点的数学模型,在此基础上分析传统研究方法开展评估过程中表现出的局限性和适应性。其次,结合网络节点多 跳特征给出相应机制筛选信息域。同时引入指数级评估函数用于排除累积性差错引发的跳距误差。然后形成一套评估函数 的实施策略。最后,搭建实验模型部署实验方案,将评估函数同传统研究方法开展对比。经过三项实验的多次考察表明,本文 研究的指数级评估函数部署在模糊网络中,各项指标均占据优势。     

The impact of intellectual capital on the competitive advantage: Applied study in Jordanian telecommunication companies

This research investigates the impact of intellectual capital components on the competitive advantage in the Jordanian telecommunication companies. The empirical findings indicate that the relational capital and the structural capital have positive impact on competitive advantage. Both the relational capital and the structural capital account for 48.4% of the competitive advantage. It is unexpected to find that the human capital does not have a significant direct impact on competitive advantage. However, it is valid to state that the human capital indirectly and significantly influences competitive advantage as it is embedded in the relational capital. The effect of the relational capital on competitive advantage is moderated by gender and age. The effect is strongest among younger men. In the case of the structural capital its effect is moderated by gender only such that the effect is slightly stronger for females rather than males.     

Building outsourcing relationships across the global community: the UPS–Motorola experience

The United Parcel Service (UPS)–Motorola case study revolves around two major areas of information technology (IT) management: IT as a competitive tool and global outsourcing of IT projects. It provides an opportunity to become familiar with the decisions and actions taken by UPS to assure their competitive advantage in the turbulent courier services industry. In the IT outsourcing area, the case addresses managerial and technical issues associated with outsourcing IT projects across the global community. The case presents the specific factors that made this outsourcing project successful and discusses the development of the outsourcing relationships between UPS and Motorola (Israel), from initial negotiations to the creation of a strategic alliance between the two companies. A major point in this case is the gradual development of trust between the two sides, trust that led the two firms from being committed to a contract to becoming strategic partners.     

MySQL在商业运行模式下的优势

MySQL是一个广受Linux社区人们喜爱的半商业的数据库。其经济性受到相当多用户的青睐,并且凭借其在存储过程的优越性能使得其实用性也远超其他数据库模式,占据很大优势。