共查询到20条相似文献，搜索用时 62 毫秒
1.
物联网技术正在影响着各个行业的发展格局。对物联网技术进行了介绍,将物联网技术应用于旅游交通运输行业,对旅游交通中车辆追踪方案、旅游交通中停车场管理方案、旅游交通中一卡通管理方案进行了研究。在旅游交通中应用物联网技术可以有效地实现车辆的实时监控,提高景区停车场的使用效率,完成安全快捷的支付交易,并优化旅游交通资源,推进旅游产业从传统业务模式向智能信息化模式的转变进程。 相似文献
2.
传统车辆调度模型针对复杂的路况和复杂的车辆流动信息,存在调度时间长、难以提供实时调度时间的缺点,从而造成模型中前后级调度信号失联、调度算法冲突,效率不高的问题.本文提出一种改进遗传算法交通调度平台大规模拥堵优化调度方案.通过对算法编码过程进行合理的优化,加入针对多调度中心的约束条件防止算法陷入早熟,通过不同的分析角度,分别建立的回路形式和时间优化控制形式对车辆进行合理的调度.仿真结果显示,改进后的算法有效地降低了车辆平均延误时间,提高了交通运行效率. 相似文献
3.
《科技通报》2015,(12)
研究云计算环境下的大型智能交通调度问题。云计算环境下的大型智能交通网络在进行车辆调度的过程中,由于运算量过于庞大,造成交通调度效率降低,运输成本增加。利用传统的遗传算法进行交通调度的过程中,无法避免由于早熟和停滞的现象造成的影响,难以搜索到最优交通路线,从而降低了交通调度的效率。为此,提出一种基于神经网络算法的大型智能交通调度方法,根据约束条件建立神经网络模型,确定各神经层中神经元的输入与输出关系式,从而得到基于神经网络算法的最优交通调度方案。实验结果表明,利用改进算法进行云计算环境下的大型智能交通调度,缩短了交通调度完成时间,提高了交通调度效率,效果令人满意。 相似文献
4.
5.
智能交通调度模型设计是保障交通网络畅通的关键。传统的基于PID控制律的智能交通调度模型存在抗毁性和鲁棒性不好的问题。提出基于反向最近邻查询改进方法的智能交通调度模型,引入跟随蜂搜索蜜源算子,基于反向最近邻查询改进方法,建立一种基于粗糙集理论的前馈补偿动态博弈数学模型,提取制约交通拥堵的车辆密度、不同车道内的车辆加权平局速度等信息特征,作为PID路网系统的输出,克服实体无规则增长导致调度控制精度不高的问题。采用基于蜂群算法的反向最近邻查询改进方法交通信息特征提取,实现智能调度算法和控制模型的改进。仿真实验得出,采用该智能交通调度模型,可以有效提高车辆通行吞吐量,缩短路阻时间,保证了车辆畅通运行。 相似文献
6.
提出一种考虑大差异约束条件下的车辆线性规划优化调度模型。针对车辆调度成本紧密相关的运输量以及车辆利用率两个大差异约束条件,塑造调度总费用最低的车辆调度模型,按照车辆调度问题的实时性以及复杂性的要求,分析了确保车辆费用最小化下的车辆调度约束条件,基于该约束条件,根据车辆调度的线性规划原理,构建车辆调度的线性规划模型,采用匈牙利法求解最优车辆调度解。实验结果说明,所提调度方法进行车辆调度的各项指标都优于传统方法,并且具有较低的调度费用和较高的收敛效率,可对车辆进行快速、平稳的调度。 相似文献
7.
资源调度是当前云计算研究的热点,但是云计算中的虚拟节点的资源调度存在效率低,稳定性低的问题。针对这种情况,本文首先建立云计算环境下的资源调度模型,在模型中引入了优化后的蝙蝠算法,优化中引入混沌算法中的立方映射函数,对蝙蝠的个体进行混沌优化,同时缩小了搜索空间,加快了收敛速度。通过在Cloudsim平台上仿真实验表明,该算法在性能上、资源调度效率和任务调度方面都有很大改进,有效提高了云计算系统的资源调度能力。 相似文献
8.
在基于物联网平台下的REST架构体系中,实现生产作业过程的优化调度的关键是进行作业线的支配集优化控制。传统的生产作业线的支配集控制算法采用遗传算法进行柔性工业控制,迭代步数较大,性能不好。提出一种基于生产质量—效率—成本控制的多目标模糊贴近度数学模型构建的物联网平台下的REST架构体系,实现对生产作业线支配集优化控制。开发REST物联网架构体系的工业控制系统平台,计算REST架构体系下的作业线模糊贴近度特征,得到多目标模糊贴近度数学模型,构建REST架构下的多目标作业线物联网络模型,进行优化目标控制函数设计。实现对REST物联网架构模型下的支配集实现优化控制。以某大型工业生产企业的生产作业线控制平台为例,进行实例仿真,得出该算法对多目标的作业线控制具有较好的控制精度,预测效果较好,提高了工业生产效率,具有较好的工程应用价值。 相似文献
9.
传统交通控制模型,在采集交通流量过程中会受到类似车辆动作的干扰,不能分析非完全静止的车辆运动状态,对交通流量疏导准确率低,提出一种物联网框架下分层反馈的交通流量疏导模型,分析了物联网框架下交通流量疏导模型的感知层、网络层、应用层功能,通过分层反馈方式先反馈一部分粗略的信息作车辆选择,再反馈一部分精确的信息作交通流量疏导,为了降低物联网各层间的协作复杂度以及降低反馈开销,对每个小区融入基准矢量以及门限缩小反馈的范围,物联网框架下的车辆和交通流量疏导模块通过两次交互完成交通流量数据传递,实现交通流量的有效疏导。仿真实验结果说明,该模型可以有效疏导相应区域的交通流量,具有高效率和高精度的疏导性能,为交通流量监测提供可靠依据。 相似文献
10.
生产调度和设备维护是制造系统中的两个关键问题,两者的目标是统一的,但也存在冲突点,为找到两者之间的平衡点,提出了一种满足可靠度约束的预防性维护和生产调度的集成维护优化模型.以制造系统总生产费用最小为目标,引入可靠度约束条件,通过改善因子来描述预防性维护对设备役龄的改善效果,分别建立了预防性维护和生产调度的独立模型以及两者的集成优化模型.以故障率服从威布尔分布为例,利用遗传算法对模型进行了求解和优化,结果表明,该集成优化策略是实用而有效的,可为生产实际中设备维护计划的制定和生产调度提供决策支持. 相似文献
11.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
12.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
13.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
14.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
15.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
16.
Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
17.
Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
18.
《中国科学院院刊(英文版)》2014,(3)
<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence 相似文献
19.
Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels 总被引：1，自引：0，他引：1
《中国科学院院刊(英文版)》2014,(3):267-268
<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese 相似文献
20.
WANG Sijia 《中国科学院院刊(英文版)》2014,(2):192-194
<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages. 相似文献