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针对传统大型三维视景模拟训练系统存在的真实感差、成本高、人工干预程度大等问题,构建了一种基于星载自动识别系统(Automatic Identification System,AIS)信息的船舶模拟训练平台。该平台引入星载AIS数据提取实船静动态消息,经数据清洗、插值和融合后生成完整航线,能够用AIS真实数据驱动二维电子海图显示,生成三维视景。平台集成多元电子海图数据源,提供融合AIS和雷达目标信息的二次开发接口。在保证航行安全的前提下,船舶态势形成追越、会遇局面时,模拟船能够自动完成车舵操作并给出相应的灯光音响信号。该平台能够为复杂条件下航行与编队运动训练课目提供基础支撑。 相似文献
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投资者关系是资本市场上资金的供给方(投资者)与需求方(企业)之间的关系。会计信息系统是资金需求方在其内部构建的,为价值管理、价值创造提供决策信息的系统。在经济一体化、信息技术飞速发展的今天,在资金流动并增值的整个过程中,投资者关系管理(IRM)与会计信息系统(AIS)密不可分又各有分工,共同完成价值管理与价值创造。将以客户关系管理为主的关系型企业的模式应用于资金流方面,关系型AIS用全新的视角看待投资者关系,并充分地利用现代信息技术进行资金流上的关系管理,以发现、对话、制度为管理框架,实现价值创造的最终目标。 相似文献
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Alessandra Tassa 《Journal of Economic Policy Reform》2020,23(1):34-48
ABSTRACTEarth-observing satellites provide regular and accurate data that can support evidence-based decisions and public policies in a wide range of domains, potentially bringing huge socio-economic benefits. However, obstacles to effective data exploitation and poor awareness about their impacts risk hindering this potentiality and threaten the investments. Leveraging on the case of the Copernicus Programme, we review the challenges related to the full exploitation of free environmental space data and to the measurement of the related impacts. We then discuss the need for empirical approaches based on value-chain analysis with the objective to stimulate further societal and economic research. 相似文献
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针对星载船舶自动识别系统(AIS)的含噪复值信号盲分离算法分离效果不佳的问题,提出了改进的复值快速独立分量分析算法(FastICA)。该改进算法针对混合信号数目大于源信号数目的超定情况,对含噪混合信号的协方差矩阵进行特征值分解,利用其噪声对应的几个较小特征值估计噪声方差,修正白化矩阵,再应用Huber M估计函数优化该算法的目标函数。实验结果表明,运用该算法信号均方误差(SMSE)变小,信干比(SIR)变大,提高了信号的分离性能;同时,优化后的目标函数使算法具有良好的稳健性。 相似文献
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Adi Masli Vernon J. Richardson Juan Manuel Sanchez Rodney E. Smith 《International Journal of Accounting Information Systems》2011,12(3):189-205
The resource-based view has been used in IT business value research to theorize and investigate the impact of unique IT capabilities on sustainable competitive advantages. Prior research has empirically documented a positive association between superior IT capabilities and firm performance. However, such analyses have focused on IT capabilities of firms in the early 1990s. In this study, we examine the impact of superior IT capabilities on firm performance over the 1988–2007 period, which allows us to consider the structural shifts in the return of IT capability over time. Our results suggest that firms with superior IT capabilities are able to attain higher firm performance levels until 1999. However, such performance advantage disappears in the post-1999 time period. We also find that a subset of firms that sustain high levels of IT capabilities during the period 1988 to 2007 continue to perform better than their peers. We conclude that managers are able to achieve superior firm performance if they are able to maintain high levels of IT capability over time. 相似文献
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罗莉 《云南财贸学院学报》2007,23(1):47-50
信息技术的广泛、深入应用,使企业管理者在处理与市场参与者之间的关系时选择了“需求导向”的理念。将此理念应用于资本市场,企业管理者必须考虑投资者关系管理。通过对投资者关系管理、会计信息系统及财经沟通三方面的文献综述,得出以下结论:投资者关系管理的核心是信息沟通;作为投资者关系管理的信息来源,限于信息技术的发展,会计信息系统在沟通功能的研究、开发、应用方面存在不足;对财经沟通的研究未涉及会计信息系统。为此文中提出应利用先进的信息技术,在会计信息系统中构建与投资者的沟通平台,为投资者提供他们想要的信息,赢得他们的信任,以降低企业资金成本,提高公司价值。 相似文献