共查询到20条相似文献，搜索用时 296 毫秒
1.
为了进一步提高医养健康服务质量并解决传统方案中存在的数据时延与数据隐私问题,提出一种居家环境中健康信息采集与管理系统架构方案。该方案采用雾计算范式,通过部署在社区中的众多智能网关形成边缘雾,能够更好地拓展云计算覆盖范围并解决基于云的物联网模式数据延时严重和带宽资源利用率低的问题。主要功能包括用户设备接入管理、实时数据处理、任务紧急程度分类、针对用户数据分析结果的消息通知等。该方案的实现能够进一步提高医疗服务质量、简化服务流程,适用于新型养老模式与高级住宅建设。 相似文献
2.
张丽 《邢台职业技术学院学报》2008,25(3):24-26
数字电视的条件接收系统运用各种数字技术通过对节目的加扰处理（对传榆流中的数字信号进行加密）,使只有授权用户才能收看被加扰节目,从而保障运营商的利益,保证数字电视发展。本文主要阐述数字电视条件接受系统的用途和前景。 相似文献
3.
企业信息查询系统将分布各地独立的信息业务系统的信息使用Web服务技术进行集成,通过公用或者专用互联网络满足用户的访问需要。因其异构性和基于Web服务,安全问题尤其特殊与重要。使用CA安全中心统一管理用户身份认证与服务之间的信任访问,通过安全令牌、数字签名和数据加密建立应用层的安全控制机制,满足了异地查询系统的安全需要。 相似文献
4.
王战平 《宁夏师范学院学报》2008,29(3):74-79
本文研究了一类随机非线性时滞种群发展系统,对随机非线性时滞种群发展系统的均方稳定和指数稳定进行了讨论.利用Burkholder-Davis-Gundy不等式,Gronwall引理和Kolmogorov不等式得到了均方稳定和指数稳定的充分条件. 相似文献
5.
李江洪 《柳州职业技术学院学报》2006,6(2):77-81
无线接入点是无线接入网络的关键设备,负责对移动主机进行管理以及协调无线网络与有线网络之间的通信。本文通过分析IEEE 802.11.IEEE 802.3等协议和Internet工程部的有关建议,从硬件和软件结构两方面设计并实现了无线接入点系统。同时为了使移动节点在无线局域网中进行快速有效的切换,提出了快速移动切换方案,减少了移动节点内的切换过程的注册时延和数据包的丢失。 相似文献
6.
The sleep mode which works upon low arrival traffic is introduced in IEEE802.16e standard to reduce the power consumption of the mobile access terminal. Due to the rapid growth in the sleep interval in the exponential growth algorithm prescribed in IEEE802.16e, the power saving efficiency of the mobile access terminal is limited and the average delay time of receiving data frames is prolonged when the arrival rate of data frames is low. To obtain lower power consumption and shorter average delay time, the l... 相似文献
7.
服务贸易自由化及中国服务贸易市场准入初探 总被引：1，自引：0，他引：1
郑吉昌 《金华职业技术学院学报》2002,2(1):64-67,82
世界服务贸易发展的异军突起，日益成为推动世界经济增长的“引擎”，也成为衡量一国国际竞争力的一项重要标准。本文分析了在经济全球化进程逐渐加快成为世界经济发展主流的条件下，国际服务贸易发展的原因和服务贸易自由化趋势的特征，并提出了中国服务贸易市场准入问题的几点思考。 相似文献
8.
尤丽萍 《福建工程学院学报》2020,(6):598-603
为提高公路车辆的数据服务效率和通信服务的能量利用率,将分簇算法应用于实际环境的数据传输,提出一种新的传输机制。针对公路环境,应用分簇和数据聚合,进行了实时的双向数据协作传输在公路上的应用设计。仿真结果表明:在公路环境中,整合了分簇和数据聚合的数据传输机制能有效提高服务率、减少服务时延、提高吞吐量并减少能耗。 相似文献
9.
Using data from a census of private schools in one of Lagos, Nigeria’s administrative jurisdictions, this paper explores the linkages between a heterogeneous sector of private schools and issues of school access, affordability, quality, and ultimately social mobility for households at the bottom of the income distribution. Although a large private education market has buoyed Lagos’s growth towards near-universal primary enrolment, this heterogeneous school sector appears to be providing socially stratifying paths towards educational attainment. We apply Lucas’s theory of effectively maintained inequality to assess the extent to which access to higher quality education services within the private sector is determined by cost. We find that higher-cost private schools provide students with greater opportunities to study in institutions with higher quality inputs and increased potential for progression within the educational system. As such, it is highly likely that these schools are primarily accessible to students at the upper ends of the income distribution. 相似文献
10.
Bruce Fuller 《Research in higher education》1976,5(1):27-38
Federal and state student financial aid programs have increased substantially in past years. Such programs have clearly provided greater access to postsecondary education for low income and minority students.However, data recently collected in Los Angeles indicate that additional financial aid may have a diminishing impact on increasing access. The Los Angeles study, commissioned by the California Legislature, revealed that low levels of academic achievement, inadequate information, and inflexible admission policies are greater barriers to college for the poor than financial need.Educational opportunity programs, which provide counseling, tutoring, and information services, should become increasingly important in addressing nonfinancial barriers. Yet such programs are often politically unattractive to legislators and administrators who view student grant programs as simpler and less costly. 相似文献
11.
The development of a system of regulation in early childhood care and education (ECCE) in Ireland was a slow process. Some decades passed between initial calls for regulation and the actual implementation of standards in 1997, reflecting the delay and inaction that has characterised ECCE policy implementation in general in Ireland. The present system has been criticised by some as not being far-reaching enough and a review, originally promised in 2001, is still overdue at time of writing. The question arises as to whether a regulatory system can fulfil the dual functions of, first, ensuring that services are meeting acceptable minimal standards and, second, supporting services to improve quality of provision beyond minimum standards and which promote children's development and learning. This question is explored in the light of discussions with the various stakeholders, recent policy developments in ECCE in Ireland, and the international debate on the relationship between regulations and quality. 相似文献
12.
采用一种新的二叉树形算法分析技术,利用概率母函数,对总线随机争用系统中信息分组冲突分解的信息包时廷进行了研究,获得了冲突信息分组平均时延的解析式.同时进行了计算机模拟.模拟结果与理论分析吻合. 相似文献
13.
张德树 《绵阳师范学院学报》2011,30(11):107-110
数字电视与模拟电视相比,不仅实现了图像和伴音质量的大大提高,使高清晰度电视变为现实,而且为其开展增值业务提供了条件。为了保证数字电视系统所传输的某些信息的安全,防止非法用户窃收,通常采用加解扰与加解密技术,即实现条件接收。该文主要介绍条件接收系统的发送端的加扰、加密过程和在接收端的解扰、解密过程,以及我国现阶段的智能卡加解扰系统的工作原理。同时也分析了由于数字电视条件接收系统(CAS)内在的脆弱性,也存在的被攻击可能,从而提出一种增强CAS系统安全性的解决方案。 相似文献
14.
The South Africa Schools Act requires every child to “attend school from the first school day of the year in which such learner reaches the age of seven years until the last day of the year in which such learner reaches the age of 15 years or the ninth grade, whichever comes first” (Republic of South Africa, 1996). This paper addresses three questions in relation to this. First, to what extent has this legal requirement been met? Second, what are the trends in relation to achieving universal access to compulsory education? And third, what are the factors related to and characteristics of those learners of compulsory school age who are not attending? To address these questions, we have made use of the Statistics South Africa dataset, Community Survey 2007. Our analysis suggests that the size of the compulsory age population who are not attending school may be slightly higher than some government sources have suggested. The trend associated with access remains consistent, with the only major change over the past 10 years being the improved levels of enrolment of six and seven year old children. With regard to the factors related to and the characteristics of children who are not attending school, our analysis reveals that certain sub-populations have higher non-attendance ratios: coloured boys; children whose parents, particularly mothers, have died; children born outside South Africa; children who have moved in the past five years; children with disabilities; and children living in some specific rural communities. A number of broad but interrelated factors may account for children not being in school: disability; family structure; children living in households that are eligible for social grants but are not receiving them; and geographic and racial characteristics. To be poor in South Africa may mean exclusion from the mainstream of the economy, but it does not necessarily mean exclusion from access to basic state services like enrolment in schooling or social grants. Children not attending are not only likely to be living in households that are excluded from participation in the mainstream economy, but are also on the fringes of state services; they may also be on the fringes of households. The paper concludes with recommendations for further research to identify reasons why children in these vulnerable sub-populations are less likely to be enrolled. 相似文献
15.
孙少勤 《连云港职业技术学院学报》2008,21(3):6-9
近年来,全球产业结构呈现出新的发展态势,服务业外包成为经济全球化中的新亮点。通过提升服务业外包承接能力带动我国服务业发展水平,对于推动我国产业结构升级有着重大的现实意义。跨国公司服务业外包呈现出外包提供方合作加强,提供更广泛、更深入的专业化服务,外包价值链由低端向高端发展,离岸外包在服务外包中的比重越来越大等发展趋势。降低成本,打造企业核心竞争力,一直是跨国公司服务外包发展的主要因素。中国承接国际服务业外包的主要路径有四个方面：营造良好的服务业投资环境,通过吸引服务业外资发展服务业外包;加大政府扶持力度,改变我国外包企业成熟度不足的现状;大力培养服务业人才,降低服务业进入壁垒;加快服务外包企业整合,加大与国际服务外包商的合作力度。 相似文献
16.
To find the optimal routing is always an important topic in wireless sensor networks （WSNs）. Considering a WSN where the nodes have limited energy, we propose a novel Energy^＊Delay model based on ant algorithms （＂E＆D ANTS＂ for short） to minimize the time delay in transferring a fixed number of data packets in an energy-constrained manner in one round. Our goal is not only to maximize the lifetime of the network but also to provide real-time data transmission services. However, because of the tradeoff of energy and delay in wireless network systems, the reinforcement learning （RL） algorithm is introduced to train the model. In this survey, the paradigm of E＆D ANTS is explicated and compared to other ant-based routing algorithms like AntNet and AntChain about the issues of routing information, routing overhead and adaptation. Simulation results show that our method performs about seven times better than AntNet and also outperforms AntChain by more than 150% in terms of energy cost and delay per round. 相似文献
17.
为实现网格数据管理系统在GT4环境上运行和改善网格操作用户的便利性,该文通过对网格数据管理的分析,研究了网格数据管理服务和网格门户系统的集成,介绍了怎样实现网格数据门户. 相似文献
18.
Liu Zaoxin 《广西大学梧州分校学报》2007,(6)
为实现网格数据管理系统在GT4环境上运行和改善网格操作用户的便利性,该文通过对网格数据管理的分析,研究了网格数据管理服务和网格门户系统的集成,介绍了怎样实现网格数据门户。 相似文献
19.
混沌时间序列单变量和多变量重构的预测比较 总被引：2，自引：0，他引：2
提出了多变量混沌时间序列相空间延迟重构中延迟时间间隔和嵌入维数的选取方法，给出了多变量混沌时间序列的局部平均预测法，局部线性预测法和BP神经网络预测法等3种非线性预测方法．通过Lorenz系统的仿真计算表明，无论用3种非线性预测方法中的哪一种，多变量混沌时间序列要比单变量混沌时间序列的预测误差小得多，即使前的数据长度只有后的一半，前的预测误差也要小很多．另外从预测误差最小的角度验证了多变量混沌时间序列相空间延迟重构中延迟时间间隔和嵌入维数选取方法的有效性． 相似文献
20.
陆静平 《重庆大学学报(英文版)》2003,2(1)
1. Introduction Product data management (PDM) is a technology helping workgroup, department, division, or enterprise manage product data and development process throughout the product life cycle, from inception, through development and production to dispatch and beyond. As an integration tool connecting many different areas, PDM manages product data throughout the enterprise, ensuring that right information is available to the right person at the right time and in the right form. Web-based … 相似文献