我国建立急缺矿产战略储备的时机选择——以铜资源为例

我国将积极推进急缺矿产战略储备,战略储备何时启动已成为目前急需解决的问题.通过分析美国石油战略储备的建立过程,总结发达国家急缺矿产战略储备时机选择的经验指出,我国在急缺矿产战略储备时,应当吸取其经验教训,利用国际急缺矿产供求变化周期,预测其价格走势,力争在价格波动周期中寻找类似于2002年的最佳吸储时期,低成本实现急缺...     

Agent机会发现的一种相关性描述

机会发现和机会管理(ChanceDiscoveryandChanceManagement)是近年国际上人工智能等领域提出的一个新的研究课题。该文给出一种CD相关性定义来刻画ChanceEvent与agent目标之间的基本联系,为解决ChanceDis-covery的两个基本问题——“特征问题”和“区分问题”——提供了一个初步的方案。     

石油化工设备的大型化——压力容器行业的机遇和挑战

炼油厂规模和炼油装置大型化具有明显的经济效益,是世界炼油发展的一个重要趋势。但要实现炼油厂规模和炼油装置大型化必须首先实现石化设备的大型化,否则将是“无米之炊”。石化设备大型化给我国压力容器行业提出了许多新课题,促进了设备用材、制造技术、设计方法以及标准规范的发展与完善。     

浅论广东打造世界制造中心的机遇及对策

介绍广东制造业的现状,说明在中国加入WTO的新形势下,广东成为世界制造中心的特征日益显现。阐述了广东打造世界制造中心的机遇、条件以及面临的挑战,并提出相应的策略。     

重型机械行业如何应对加入WTO后的机遇和挑战

从重型机械行业的组成、生产产品的品种及服务领域和市场形势分析入手，通过对弱热竞争与机械行业竞争状况，关税下调对重机行业影响的调研，论述了如何面对加入世贸组织的机遇和挑战。     

Advanced IEEE 802.11ax TCP aware scheduling under unreliable channels

In this paper, we suggest advanced IEEE 802.11ax (WiFi) TCP‐aware scheduling strategies for optimizing the TCP Goodput AP operation under transmission of unidirectional TCP traffic to downloading stations. Our scheduling strategies optimize the TCP Goodput performance using the capability for Multi User transmissions over the Uplink, first introduced in IEEE 802.11ax, together with Multi User transmissions over the Downlink. The scheduling strategies are based on Transmission Opportunities (TXOP), and we suggest three scheduling strategies determining the TXOP formation parameters. In one of the strategies, one can control the achieved TCP Goodput vs the delay. We also assume saturated TCP transmission queues. We show that with minimal TCP Goodput degradation, one can avoid considerable delays: It turns out that for TCP Data segments of 1460 bytes, achieving optimal TCP Goodput requires TXOPs of 25 ms, while if one loses only 5% of the optimal Goodput, TXOPs can be of only 3 ms. For TCP Data segments of 256 bytes, the TXOPs are of 13 and 5 ms, respectively.     

Home Ownership and Access to Opportunity

Home ownership and access to opportunity are foundations of the American ethos. While little research has explicitly examined a relationship between home ownership and opportunity, considerable empirical work has examined how home ownership impacts important elements of local opportunity structures as well as individual subjective perceptions of those structures. Available evidence suggests that home ownership may affect the opportunity structure by enhancing neighbourhood stability and civic involvement in local voluntary and political affairs. Home ownership may also impact perceptions of opportunity by increasing financial resources, enhancing psychological and physical health, and influencing the behaviour of youth. There is a great need for additional research that directly assesses the impacts of home ownership on local objective opportunity structures and the perception of those structures.     

Risk perceptions and approaches in multi-organizations: A research review 2000–2012

Shared risks and opportunities set specific premises for risk management (RM) in temporary multi-organizations (TMOs). However, most project RM research is presented from the perspective of a single-organizational project delivery team or covers limited risk perceptions and RM approaches. This paper aims to address how well the body of knowledge on multi-organizational RM corresponds to a state-of-art understanding on project RM and to identify which gaps need to be addressed in future research. The review involves: 1) the preferred view of risk as threat and/or opportunity, 2) the nature of addressed risks as anticipated or unanticipated risks or unrealistic assumptions, 3) the role of the multi-organization as the source of risks and/or resources for risk management (RM), and 4) the allocation of risk responsibilities. The review covers research papers published between 2000 and 2012 in four journals: International Journal of Project Management (IJPM), Project Management Journal (PMJ), Journal of Construction Engineering and Management (JCEM), and IEEE Transactions on Software Engineering (TSE). 105 eligible research papers were identified. The results and conclusion outline the identified main gaps in multi-organizational RM research compared to the state-of-art RM research and TMO-specific characteristics. The results can be used to inform research agendas on more holistic and dynamic multi-organizational RM concepts.     

Market opportunity recognition in the Chilean wine industry: traditional versus relational marketing approaches

The aim of this paper is to examine how wine firms implement their marketing strategies based on the recognition of market opportunities by their Chief Executive Officers (CEOs). Firstly, we describe the marketing activities in 69 traditional Chilean wine firms. Then, in-depth interviews with CEOs of two wineries are analysed using cognitive maps to uncover the cognitive processes responsible for recognizing and executing market activities. Our findings indicate that there is a similar set of strategic resources across the wineries, but the CEOs’ different perceptions of the usefulness of these resources in the implementation of marketing strategies have led them to select diverse strategies to increasing both the price per bottle and wine sales. This paper makes two contributions. Firstly, we compare the benefit of implementing traditional and relational marketing strategies in the Chilean wine industry. Secondly, we show that the CEOs’ perception of feedback processes among the available resources affects the recognition of market opportunities and the marketing strategy in wine firms.     

基于失真激励式机会模糊控制的视频跟踪机制

为了提高目标跟踪精度和跟踪视频质量,研究了一种具有失真激励功能和基于机会模糊控制的视频跟踪机制及其系统架构。首先,针对目标行为空域和模糊集群,通过建立群内模糊集且依据目标移动速度构建了机会模糊控制系统。然后,在分析跟踪目标的差异性和目标移动速度的随机性的基础上,以激励模糊集群用户的机会逻辑控制为目标,提出了基于失真激励的视频跟踪机制及其系统架构。最后,实验结果表明,提出的算法在系统执行效率、视频传输时延和跟踪视频质量等方面具有明显优势。