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1.
为了减少背景噪声干扰,准确地从复杂视频中提取显著目标,提出一种具有时空一致性的视频显著区域检测算法。将视频帧划分为超像素,以超像素为基本单元提取光流特征,在时空一致性原则指导下动态融合颜色、边界信息和光流特征,获取视频显著图。在此基础上,借助视频帧的细节和区域特征对视频显著图进行细化增强。实验结果表明,算法的准确率[CD*2]召回率曲线在复杂图像数据库中高于传统经典算法,具有足够高的鲁棒性,能够减少相机运动和背景运动以及突变情况对跟踪检测的影响。所提方法能够在各种运动模式下和外观复杂场景中较为完整地提取显著目标,可作为预处理技术,改善目标跟踪、行为检测、视频压缩等的性能。  相似文献   

2.
国际区域能源合作是一个具有主体多元化、关系复杂化和结构层次化等性质的复杂系统,是市场机制客观作用与国家需求意愿相互作用、融合统一的结果,因此,呈现出动态性、非线性和不确定性的特征.运用结构原理与解释结构模型建立了包括37个要素的国际区域能源合作结构模型,37个要素分布于9个层次.结构模型中的“合作意愿——合作习惯——合作主体关系结构——合作强度”子结构是国际区域能源合作的核心关系链,决定了国际区域能源合作的实现与可持续.要素分布的9个层级基本包涵了国际区域能源合作研究的关键问题.围绕核心要素与外部环境形成的4个关系链,每个关系链上要素的相互作用、互为协调机理,为国际区域能源合作稳定性实现机制构建提供了重要依据.  相似文献   

3.
本文研究环境检测领域政府监管部门、第三方环境检测机构、排污企业3个主体在信息不对称与有限理性情况下的行为选择问题, 为政府加强环境质量管理提供重要的指导意义。本文基于演化博弈理论, 构建第三方与排污企业之间的协调均衡博弈模型和第三方与排污企业合谋构成的利益集团与政府监管部门之间的非对称演化博弈模型, 研究行为主体的策略选择问题并利用Matlab仿真不同参数变化时模型的演化均衡策略。结果表明: 惩罚额度、监管力度、监管成本是分别影响监管部门、排污企业、第三方检测机构演化稳定策略的关键因素, 最后从资格审查、竞争机制、信息系统、奖惩机制方面给出政府加强环境质量监管的建议, 从而更加有效地抑制环境测领域数据造假行为。  相似文献   

4.
大型建筑企业一般纵向有多个管理层级,横向有完整的职能部门设置,如何在这样的企业构建完善的全面风险管理体系,是非常重要的课题,也是一项复杂的系统工程。  相似文献   

5.
为了实现装配关系信息的形式化、层次化以及区域化的表达,面向并行的装配规划过程提出一种分层分级组织和管理装配关系信息的层级化装配关系矩阵。首先,采用分层分级思想调整产品结构树的装配层次关系,并定义了同层级装配单元以及装配域的概念;其次,通过多色集合理论的析取(P∨S)运算进行逐层推理,建立以装配域为单位的、同层级装配单元间的装配关系矩阵,包括同层级装配干涉矩阵和同层级装配连接-配合矩阵;最后,通过应用实例验证了层级化装配关系矩阵满足并行装配序列规划需求。结果表明,层级化装配关系矩阵避免了重复的干涉检测,生成多个组合或层次的规划序列,提高了并行装配序列规划过程中装配关系信息的搜索效率。研究结果可为复杂产品的装配关系信息表达提供参考。  相似文献   

6.
为了解决YOLOv3-Tiny对无人机采集的风机叶片图像损伤检测精度不高的问题,提出一种基于深度学习的风机叶片图像损伤检测方法。首先提出一种跨越式特征联合网络结构,由卷积层和拼接层构成,将不同深度的特征信息进行融合再学习,提取目标多层级特征信息;其次引入Inception模块结构,其中4个平行通道的多个卷积核对输入的特征图进行组合和压缩,在减少网络的学习参数的同时更好地表征图像特征信息,提高小目标的检测精度。实验表明,改进后算法的检测精度提高了2.69%,在自制的数据集中mAP可以达到88.58%,并且模型的参数缩小了4倍。因此,改进的方法比传统的YOLOv3-Tiny网络具有更好的检测效果。研究结果可为基于图像的损伤检测和风机叶片损伤智能识别提供参考。  相似文献   

7.
利用多自主体系统构建了人群开采区域自然资源模型,考虑自主体的开采策略与区域自然状态间的双向关系,利用博弈论中的雪堆模型定义了自主体收益矩阵,考察了区域自然恢复系数、收益矩阵取值与投入比例等参数对最终仿真结果的影响,进行了环渤海等地区的地下水资源开发利用问题的案例研究,得出了对理解人群实际开采行为及制定相关政策具有启示意义的结论。  相似文献   

8.
海上丝绸之路的建设受到多种因素影响,这些因素涉及领域广泛且关系复杂。为厘清因素之间的层级关系和影响力排序,为决策者有重点地制定海上丝绸之路建设方案提供参考依据,本文从基础条件、政治外交条件、经济条件、安全条件、保障条件等7个方面构建海上丝绸之路建设的影响因素指标体系。采用解释结构模型(ISM)分析得到由表层直接影响因素、中间层间接影响因素和深层根本影响因素组成的3级多层递阶 ISM ,然后利用层次分析法(AHP)确定表层影响因素的权重排序。结果表明:ISM 能有效地建立海上丝绸之路建设的影响因素层级结构,可以直观地反映出因素间的层次关系;AHP 法可以识别影响海上丝绸之路建设的关键和重点因素,包括专门的管理组织机构完善程度、跨国港口间通关便利性、集疏运网络完善程度。  相似文献   

9.
针对复杂数控加工中心的故障呈现非线性、非平稳性、弱信息等不确定性特点,为向复杂数控加工中心故障诊断系统设计提供分析基础,以复杂立式加工中心为对象建立多传感器分布式故障检测平台。提出基于检测平台的复杂数控加工中心静态精度和机械动态特性相结合的样本获取方法以及故障推理方法,设计由3种局部检测装置(电涡流传感器、声发射传感器、直线度测量传感器)分别组成的并行和串行结构检测融合系统,且各局部检测装置在同一故障模式下都是独立和同分布的进行检测,通过利用主观贝叶斯推理,获取判决规则,最后产生全局判决。实验表明较传统的单一传感器检测分析方法,该平台具有故障信息识别率高、诊断速度快等优点,为复杂数控加工中心多信息融合故障诊断研究提供可靠样本数据。  相似文献   

10.
装备制造业与生产性服务业的融合发展受市场需求、技术创新和自身竞争力提升等多层次因素共同的驱动,融合过程由技术融合、产品融合、市场融合和组织融合等阶段有机构成;产业融合受产业技术能力因素、产品能力因素、市场能力因素、管理能力因素和环境因素的共同影响;本文利用中间投入率和中间需求率指标构建融合水平综合测度模型,依据SFA方法和Cobb-Douglas生产函数构建装备制造业与生产性服务业融合影响因素的评价模型,基于中国30个省市截面数据进行实证研究,揭示融合影响因素的影响强度和影响方向,最后提出促进装备制造业与生产性服务业融合发展的对策和建议。  相似文献   

11.
为了解决高速公路出行路径选择问题,基于图论模糊算法,提出了大数据下的智慧诱导技术。首先对高速路网在路径诱导的实时性、线路规划的精准度和算法的适用性方面进行优化;其次通过利用贪心算法和整体寻优算法,对经典路径诱导算法进行研究和比选;最后针对高速路网提出基于大数据动态规划的路径诱导技术,采用大数据、内存计算、图计算和AI结合的方式来实现大数据的动态实时路径诱导。研究结果表明,智慧诱导技术可主动为有不同诉求目标的出行者提供实时最优的方案选择,解决复杂路网下动态路径的合理诱导问题。所提出的方法可实现大数据驱动下的智慧诱导,对进一步提升公路智能化和精细化管理水平具有借鉴意义。  相似文献   

12.
This paper is focused on supply chain management from the perspective of inventory management. The coordination of order and production policies between buyers and suppliers in supply chains is of particular interest. When a buyer of an item decides independently, he will place orders based on his economic order quantity (EOQ). However, the buyer's EOQ may not lead to a favorable policy for the supplier. A cooperative order and production policy can reduce total cost significantly. Should the buyer have the dominant position to impose his EOQ on the supplier, then consequently no incentive exists for him to deviate from his EOQ in order to choose a cooperative policy. To induce the buyer to order in quantities more favorable to the supplier, the supplier could offer a cooperative policy associated by a side payment to the buyer. The research presented in this paper provides several bargaining models depending on alternative production policies of the supplier. With these bargaining models the offered cooperative policy and the offered side payment can be derived.  相似文献   

13.
Open access scheduling, introduced in recent years, is a revolutionary concept for improving healthcare access and reducing patient no-shows. In this paper, a Markov chain model is presented to capture appointment scheduling in open access clinics when considering patient choice of appointments. Due to the curse of dimensionality, it is impossible to solve the steady-state distribution of the Markov chain model for a typical-size open access primary care clinic. Therefore, an approximate approach is proposed to efficiently estimate the performance of a provider capacity policy based on the Markov chain model. This approach can accurately estimate the performance of a practical capacity policy in a significantly shorter time. Using this approach, the impact of patient choice on the performance of provider capacity policies is investigated.  相似文献   

14.
Internet non-use is increasingly concentrated in vulnerable groups of people, especially among ageing populations and those with low socio-economic status. As participation in society becomes largely dependent on use of internet-enabled technologies, internet non-users may seek alternative ways of using the internet. Proxy internet use (PIU), where internet non-users ask internet users to perform online activities on their behalf, is a strategy for obtaining (indirect) internet access. This study examines factors for engagement in PIU, focusing specifically on how non-users’ reasons for disengagement relate to their engagement in PIU. The results from multivariate analyses of survey data from a nation-wide representative sample show that 47% of internet non-users in Slovenia who report having someone available for PIU in fact engage in PIU. In analysing four types of reasons for internet non-use—those related to interest, access, costs and skills—the results show that access issues are negatively related to engagement in PIU. Conversely, reasons related to skills issues are positively related to engagement in PIU. Considering that access to online services through PIU offers an important degree of digital inclusion, the results of this study have important policy implications. Policy initiatives tackling digital inequalities should be sensible to access and skills issues resulting in disengagement. For example, policies directed at providing and maintaining internet access at a household level may result in non-users’ increased opportunities for PIU. In contrast, skills policies should be directed at creating opportunities for informal and person-centred learning of digital skills, considering that non-users who are more aware of their deficiency in skills might be more aware of online opportunities.  相似文献   

15.
We present a guideline for selecting the inventory management policy for a specialty chemical plant that produces products with limited shelf life, by producing multiple grades of bulk chemical and packaging them into a large variety of bottles. The policy for each product was selected based on a cost-benefit analysis, using the multiple objectives of maximizing the on time order fulfillment, minimizing the production (cleaning and shelf life expiration) and inventory costs. To generate realistic cost estimates, we developed a discrete event simulation model that included demand variability, planning and scheduling policies, and operational details. We evaluated three different policies: make-to-stock (MTS), postponement, and combined MTS/postponement. We also evaluated different storage media and optimized the number of storage units for products selected for postponement. A combined MTS/postponement policy, in which postponement is applied to products with low to medium demand and high expiration provided lowest costs without significantly impacting the customer on time order fulfillment. For all other products, a MTS policy is applied to maximize order fulfillment on time, reduce cleaning costs and to reduce number of storage units.  相似文献   

16.
中国特色社会主义市场经济建设需要有效市场和有为政府更好结合,其中的一个重要途径是强化竞争政策基础地位,推进产业政策从选择性向普惠化、功能性转型。竞争政策强化与产业政策转型具有内在关联性,二者相互配合,共同促进有效市场形成。本文构建了基于竞争成功函数和共容利益假设的政企互动模型,研究发现:竞争政策和功能性产业政策有利于提升市场竞争效率,而选择性产业政策会降低市场竞争效率;功能性产业政策在一定程度上能起到弥补市场失灵的作用,体现了有为政府的积极作用。进一步考虑非对称市场竞争时发现,竞争政策可以同时兼顾提升市场竞争效率和分配效率两项目标,而选择性产业政策在两项目标上相互掣肘、由此强化竞争政策的优势凸显。本文理论模型的结论表明,有为政府应强化竞争政策基础地位,为产业政策转型创造良好的市场环境,加快选择性产业政策向功能性产业政策转型,放宽市场准入,持续推行公平竞争审查制度,维护和促进有效市场。良好的经济运行秩序需要有效市场减轻政府管控压力、有为政府简政放权营造良好市场环境,实现有效市场和有为政府更好结合。  相似文献   

17.
为了研究网络表示学习在社交网络中链路预测方面的应用,提出了一种基于骨干度与网络编码的链路预测模型(BDLINE)。在网络表示学习算法LINE的基础上融入骨干度算法,通过给一阶相似度和二阶相似度中增添骨干权重,将网络编码到多维向量空间中,调试到最优参数。实验采用2个真实数据的数据集,分别在不同的算法模型上进行多次实验。实验结果表明:在链路预测方面,BDLINE均比其他网络表示学习算法的性能有所提升,AUC评测值更高,预测效果表现得更好。因此,所提出的方法可以方便地提取网络特征信息,更好地处理社交网络在链路预测中的随机性,对社交网络中预测网络节点的关联性和有效性具有一定的参考。  相似文献   

18.
In this work we propose an efficient dynamic programming approach for computing replenishment cycle policy parameters under non-stationary stochastic demand and service level constraints. The replenishment cycle policy is a popular inventory control policy typically employed for dampening planning instability. The approach proposed in this work achieves a significant computational efficiency and it can solve any relevant size instance in trivial time. Our method exploits the well known concept of state space relaxation. A filtering procedure and an augmenting procedure for the state space graph are proposed. Starting from a relaxed state space graph our method tries to remove provably suboptimal arcs and states (filtering) and then it tries to efficiently build up (augmenting) a reduced state space graph representing the original problem. Our experimental results show that the filtering procedure and the augmenting procedure often generate a small filtered state space graph, which can be easily processed using dynamic programming in order to produce a solution for the original problem.  相似文献   

19.
Courses on the management of innovation and technology seldom treat government technology policies, and the issues they pose for business management. This is unfortunate. In many fields business has a big stake in government technology policies. They can help business, be a waste of money, or actually hurt business. This essay considers three broad issues in contemporary technology policy, that are of significant consequence to business: government support of applied research, the question of how to deal with the decline in business-funded basic research, and the complex questions about intellectual property rights.  相似文献   

20.
针对网络管理设备、接入设备、客户接入终端、网络结构、通信技术等方面都发生了质的变化,而网络管理模式、新型网络管理系统的研发相对滞后的情况,结合企业实际需要,提出了基于多Agent的通用智能网络管理系统方案并对其进行了实际的系统设计实现和运行验证,取得了良好的效果。该网络管理系统不仅能够实现传统的网络管理功能,而且能够适应当前复杂的网络设备构成情况,节约网络管理流量,提高管理效率,保障网络服务的持续可靠运行。  相似文献   

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