基于 ROS 改进算法的无线传感器网络耗能研究

成对广播同步（PBS）是无线传感器网络同步研究的重要协议。无线传感器节点具有体积受限、通信能力有限、存储空间较低、能量有限等特点,对传统的时钟同步协议改进是非常有必要的。因此,研究无线传感器网络的时钟同步算法将具有重要的意义。文章建立在仅接收端（ROS）同步基础上实现范围广阔的网络同步,并且能够在无线传感器网络节点的能耗方向有着不可忽视的作用。通过对单簇网络同步的研究,提出多簇网络同步并对多簇网络同步在无线传感器网络同步中全网成对选择算法（NPA）和基于组的成对选择算法（GPA）做出研究,并且做出了仿真对比。结果显示：在传感器节点数目较少的情况下,NPA 算法与 GPA算法处理消息包数目的性能几乎相同;在网络中传感器节点数目比较多的情况下,GPA 算法明显优于 NPA 算法,信息处理过程中大大减少了消息包数目。最后,对广播同步技术在应用中所出现的问题,提出了基于此算法的新的研究方向。     

Magic小组与它们的MagicVoice

感谢我们的父母在非典期间给我们莫大的鼓励与支持。感谢在开发过程中为我们提供帮助的所有教师和朋友。感谢参赛的其他队伍，你们的作品和创意让我们扩展了思路。感谢微软为我们提供了一个展示自我和向别人学习的机会。     

基于生态系统服务的黄河滩区生态修复模式探索——以郑州黄河滩地公园规划设计为例

黄河流域是中国重要的生态屏障和经济带,黄河生态系统是一个有机整体,下游的黄河滩地对流域生态系统健康和生物多样性具有重要意义.然而,当前黄河下游滩区自然环境相对复杂,加之受到防洪政策、农业活动、村庄建设、生产堤等诸多因素的影响,自然生态系统遭受到较大破坏,生态系统服务功能受损严重,影响黄河流域的健康发展.郑州黄河滩地公园...     

与荒野共生:城市绿地的发展前景

"荒野"(wilderness)是一个根植于人类社会的文化概念.对于当代景观设计师或是景观设计先驱来说,荒野一直以来的重要性既在于其与人工景观元素的鲜明对比可以为自然主义植物设计提供灵感,也在于如今为协调城市、城市居民与自然做出的贡献.人们习惯上将城市和荒野视为对立面,因此有必要采取新方法以便更好地应对与城市语境下荒野...     

城市荒野:另一种文明

自折下树枝、打磨石块作为武器和工具、烧制黏土作为容器起,人类便开始走向背离荒野的文明之路—城市、农田和园林在化石能源和机械力的推动下,不断取代原生的自然,自然的野性被日益驯化.失去野性的人类变得寂寥而萎靡;于是,野性和荒野如今被重新提起.城市荒野既包括荒野景观,也包括保留了野性的、不受人工干预的自然过程和生物.作为一种...     

景观的"变"与"不变"

科学辨识与主动介入景观的演变是景观设计学领域的重要话题."变"是客观的、绝对的,"不变"则是主观的、相对的.因此,景观的演变是绝对的,但人类对这一表象的衡量则是相对的.基于这一认识,我们提出具备时间维度的连续性与稳定性,和空间维度的稳定差异化表征的"持久性景观",指出理解这一概念的关键在于对自然生态系统的稳定与人文社会...     

一种基于数字水印的媒体自动识别技术

将日后需要用计算机进行识别的信息实现以水印的形式嵌入载体中，可以不影响载体感官效果，同时使得用计算机识别该载体内的特征信息变得简单可行。针对特定领域提出了实现该目标的一个模型，并给出了相应的算法。算法具有优良的性能，可以快速有效地满足识别要求，识别率很高，同时也满足了信息安全方面的要求。     

互联网时代下城市空间品质提升与特色保护

In this interview, three scholars discussed the problems in China’s urban renewal practice in the Internet Era and the context of inventory development. They first reviewed the factors that impact the characteristics and identity of urban space, and pointed out that urban renewals should not neglect the social, cultural, artistic, historical, and ecological qualities of space. They then underscored the aesthetic education will be future research and practice interest in the field of urban renewal. They noted that, under the impact of “attention economy” and ”online influence,” urban spatial construction across Chinese cities would be homogenized, compromising the diversity of spatial characteristics. Nonetheless, urban planners and designers can leverage the online platforms as communication channels and resources for the protection of spatial characteristics and identities, and to foster new urban development paradigms. In addition, the scholars believed that the public should have a greater discourse power in urban renewals, which requires the the promotion of Community Co-building Initiative, and designers’ efforts in promoting related research and education programs. In the end, they discussed the challenges faced by the protection of historical sites, including the outdated urban governance methods, flawed urban development institution, and the lack of funds due to the slowdown of economic growth. They also encouraged designers to respond to these challenges with long-term, proactive, and innovative perspectives, truly meeting citizens’ daily needs, improving urban governance methods, optimizing urban renewal mechanisms, and impelling the growth of local economy.     

儿童友好型城市建设背景下景观设计师的职责和角色转变

More than 20 years have passed since the launch of the Child Friendly Cities Initiative. However, relevant practices in China are still insufficient and laggard. This article concludes two reasons: 1) children participation in the design process is far insufficient and results in the failure of the expression of core users’ demands; and 2) landscape architects less think of the holism of such children spaces at a city scale with considerations on city’s cultural identity and societal backdrops, and also ignore the influence of such places on children’s development. With these problems in mind, this article proposes that landscape architects can draw inspiration from the Ecological Systems Theory and Public Participation Theory, actively expanding their responsibilities in the establishment of Child Friendly City. Following that, three international case studies, namely Growing Up Boulder Initiative, Play and Informal Recreation Strategy of London, and Green Schoolyard America, are introduced to demonstrate that landscape architects should not just design proposals, but act as coordinators among different parties and leaders of innovative urban space renovation. As the integrator of the urban spatial framework, landscape architects should go beyond the design of individual playgrounds and focus on improving community environment and the spatial pattern of the whole city, in order to protect child rights and to realize integration and improvement of urban spaces.     

三门峡西段村水库泄洪洞—消力池部位黄土岸坡稳定性分析

西段村水库位于黄河支流的涧河上,大坝右岸消力池部位黄土岸坡施工过程中出现失稳变形现象,致使消力池施工被迫停止。为保证安全,需对消力池及上游右坝肩至泄洪洞出口段黄土边坡进行稳定性评价,为此,开展了必要的地质研究工作,并应用计算软件进行了分析计算,提出了针对性的处理措施。本研究成果在工程中的应用,解决了关键性工程地质问题和难题,为节省投资,加快施工进度以及防治地质灾害提供了依据。