Ｄｉｓｔｒｉｂｕｔｅｄ ｓｔｏｒａｇｅ ａｌｇｏｒｉｔｈｍ ｗｉｔｈ ｈｉｇｈ ｐｅｒｆｏｒｍａｎｃｅ ｆｏｒ ｔｈｅ ＵＷＳＮ

为解决无人值守传感器网络的数据存储可靠性问题,提出了一种具有低通信成本和低访问成本的分布式存储算法.算法采用步数为cn的并行定向随机游走机制,将网络中的k个源数据包按照一定的接收概率分散存储到网络中所有的n个节点,在每个节点形成一个存储数据包.理论分析和实验结果表明,基于该算法的存储过程完成之后,即使有部分传感器节点损坏,Sink节点只要随机收集到k+ε,ε大于等于11个存储数据包,就能成功地计算出原来的k个源数据包.与具有代表性的基于LT码的算法相比,文中算法将存储每个源数据包的通信次数从约3nlnn降至约3n;将读取源数据包的节点访问次数从大于k+100降至约k+11.Ｔｏ　ｓｏｌｖｅ　ｔｈｅ　ｄａｔａ　ｓｔｏｒａｇｅ　ｒｅｌｉａｂｉｌｉｔｙ　ｐｒｏｂｌｅｍ　ｏｆ　ｔｈｅ　ｕｎａｔｔｅｎｄｅｄ　ｗｉｒｅｌｅｓｓ　ｓｅｎｓｏｒ　ｎｅｔｗｏｒｋ ｃｏｎｓｉｓｔｉｎｇ　ｏｆ　ｎ　ｓｅｎｓｏｒ　ｎｏｄｅｓ，ｔｈｉｓ　ｐａｐｅｒ　ｐｒｏｐｏｓｅｓ　ａ　ｎｅｗ　ｄｉｓｔｒｉｂｕｔｅｄ　ｓｔｏｒａｇｅ　ａｌｇｏｒｉｔｈｍ　ｂａｓｅｄ　ｏｎ　ｐａｒａｌｌｅｌ ｄｉｒｅｃｔｉｏｎａｌ　ｒａｎｄｏｍ　ｗａｌｋ　ｗｉｔｈ　ｌｅｎｇｔｈｃｎ．Ｔｈｅ　ｐｒｏｐｏｓｅｄ　ａｌｇｏｒｉｔｈｍ　ｄｉｓｓｅｍｉｎａｔｅｓ　ｅａｃｈ　ｏｆ　ｋｓｏｕｒｃｅ　ｄａｔａ　ｐａｃｋｅｔｓ ｉｎ　ｔｈｅ　ｎｅｔｗｏｒｋ　ａｃｃｏｒｄｉｎｇ　ｔｏ　ａ　ｇｉｖｅｎ　ｐｒｏｂａｂｉｌｉｔｙ　ａｎｄ　ｆｏｒｍｅｓ　ａ　ｓｔｏｒｅｄ　ｄａｔａ　ｐａｃｋｅｔ　ｉｎ　ｅｖｅｒｙ　ｎｏｄｅ．Ｓｉｍｕｌａｔｉｏｎ ｒｅｓｕｌｔｓ　ｓｈｏｗ　ｔｈａｔ，ａｆｔｅｒ　ｔｈｅ　ｓｔｏｒａｇｅ　ｐｒｏｃｅｓｓ　ｂａｓｅｄ　ｏｎ　ｔｈｅ　ｐｒｏｐｏｓｅｄ　ａｌｇｏｒｉｔｈｍ　ｉｓ　ｃｏｍｐｌｅｔｅｄ，ｅｖｅｎ　ｉｆ　ｓｏｍｅ ｓｔｏｒｅｄ　ｄａｔａ　ｐａｃｋｅｔｓ　ａｒｅ　ｍｉｓｓｉｎｇ，ｔｈｅ　ｄａｔａ　ｃｏｌｌｅｃｔｏｒ　ｎｏｄｅ　ｃａｎ　ｓｕｃｃｅｓｓｆｕｌｌｙ　ｒｅｃｏｖｅｒ　ｔｈｅ　ｋｓｏｕｒｃｅ　ｄａｔａ　ｐａｃｋｅｔｓ ｆｒｏｍ　ａｎｙ　ｓｕｒｖｉｖａｌ　ｋ＋ε，ε≥１１ｓｔｏｒｅｄ　ｄａｔａ　ｐａｃｋｅｔｓ．Ｃｏｍｐａｒｅｄ　ｗｉｔｈ　ｔｈｅ　ＬＴ　ｃｏｄｅｓ　ｂａｓｅｄ　ａｌｇｏｒｉｔｈｍ，ｔｈｅ ｐｒｏｐｏｓｅｄ　ａｌｇｏｒｉｔｈｍ　ｒｅｄｕｃｅｓ　Ｓｉｎｋ　ｎｏｄｅｓ　ｑｕｅｒｙ　ｃｏｓｔ　ｆｒｏｍ　ｋ＋１００ｔｏ　ｋ＋１１ａｎｄ　ｒｅｄｕｃｅｓ　ｔｈｅ　ｎｅｔｗｏｒｋｓ ｃｏｍｍｕｎｉｃａｔｉｏｎ　ｃｏｓｔ　ｆｒｏｍ　３ｎｌｎｎｔｏ　３ｎ

从无序到有序及有效:公民参与立法的走向

公民参与立法是指公民以个体或团体的方式直接介入立法过程,并通过参与行为对立法决策施加影响的活动。我国当前公民参与立法在一定程度上还存在无序的情形,阻碍和制约着我国民主立法进程的推进。要走出公民无序参与立法的现实困境,必须实现公民参与立法在形式上转向有序参与,在实质上转向有效参与

Application of laser scanning confocal microscope in micro-electro-mechanical system

研究了激光共焦扫描显微镜(LSCM)在微结构分析中的应用,综述了该项应用的优势。LSCM的高分辨率和光强调节功能,使其可用于大角度测量;与图像处理系统相结合,便于微结构的定性和定量分析;而全自动样片台沿X轴和Y轴的自动扫描实现了图像的拼接功能。实验结果表明:运用LSCM测量的斜面最大角度至少可以达到50°;在悬臂梁的形貌分析中,可获得清晰的三维形貌,同时通过二维定量分析精确测得其形变为3.145μm;在100×物镜下,运用拼接功能获得384μm×288μm的视场面积,解决了高放大倍数下,在单帧显微图像中无法获取所观测对象全貌的问题。LSCM在微结构分析中的应用弥补了其它形貌分析设备测量功能上的不足,提升了微机电系统的测试水平。An application of Laser Scanning Confocal Microscope (LSCM) in micro-structure analysis was discussed in order to enhance the analyzing and measuring levels of micro structure.LSCM could be used to measure large angle because of its high resolution and adjustable light intensity,and could analyze the micro structure by combining with picture disposal system qualitatively and quantitatively,also its full-automatic sample stand could automatically scan along X axis and Y axis to realize a picture mosaic.The experimental results indicate that the maximum slope angle measured by LSCM reaches at least 50°,and the clear three dimensional profile is obtained in the profile analysis of cantilever.Meanwhile,the deformation accurately measured by two dimensional quantitative analysis is 3.145 μm,and the field area is 384 μm×288 μm in mosaic function equipped with LSCM in 100× objective,which can solve the problem that the watched object's total shape in single frame micrographic image can not be obtained under high microscopic enlargement times.Experimental results show that the LSCM can make up for measuring functional deficiency of other profile analytic equipment and can improve the testing level of MEMS.厦门大学科技创新预研基金资助项目(No.Y07002

相界面对双相钛合金层裂孔洞形核的影响

利用一级轻气炮对TC4双相钛合金进行加载,获得初期的层裂状态,在加载中采用多普勒激光干涉测速技术对样品自由面粒子速度进行测试。在软回收经过加载的样品之后,借助于金相显微镜、X射线断层扫描、纳米压痕等检测手段进行多维分析,探讨了相界面对孔洞形核位置的影响。结果表明,孔洞绝大部分都在α相内形核,而不是如准静态损伤理论预测的形核于α/β相界面。这是由于相界面的反射与透射作用,当冲击波从高阻抗α相传入到低阻抗β相时,会在α相内产生拉伸脉冲,当拉伸脉冲足够大时,导致在α相内产生孔洞

低龄DDH患儿初次开放复位术中股骨截骨必要性的前瞻性随机对照试验研究方案

回顾性研究发现,股骨截骨术并非低龄DDH患儿手术治疗所必须的,而应根据患儿具体情况合理选择;本研究通过多中心前瞻性研究进一步探讨对于18个月至3岁DDH患儿是否要行股骨截骨术。FSODDH项目为一项多中心前瞻性随机对照临床试验研究。研究设计拟招募200名单侧低龄DDH患儿,随机分成股骨截骨组(n=100)和股骨不截骨组(n=100)。股骨截骨组患儿全部采取髋关节开放复位术、骨盆截骨术及股骨截骨术治疗;股骨不截骨组患儿全部采取髋关节开放复位术及骨盆截骨术治疗;术后定期随访至少2年。收集术前、术后1周、术后1个月、术后3个月、术后6个月、术后1年及术后2年的髋关节正位X线影像资料,比较两组患儿的髋臼指数、股骨头坏死率、再脱位率、术中出血量、手术时间和住院天数等临床指标。这一多中心前瞻性研究将能为低龄DDH患儿是否需行股骨截骨术提供循证医学证据

Novel and Comedy——A Book Review on The Destructive Comedy: Research on the Transformation of the Chinese Novel in the 80-90's of the 20th Century

《颠覆的喜剧》为读者提供了一个有意味的文学现象:小说作为一种文类的兴起与喜剧艺术取代悲剧艺术的艺术史事件是同步发生的。在某种意义上该书也可以读作“罪感与怨恨”的东方叙事学。作者从自然之人与陌化之人、肉身自我与精神自我、以及父子伦理等问题入手,讨论了文学中由怨恨心理所导致的道德伦理价值的喜剧性颠覆现象。而“故乡何谓”以及“女性话语的建立逻辑”可以看作是由“父子关系”这一大主题所衍生的两个子主题,从而使全书构建起20世纪中国文学关于“罪感与怨恨”的叙事学系谱。The Destructive Comedy proves that the rise of novel accorded with the history of the tragedy substituting for the comedy, and accordingly the book could be interpreted as a narratology of the themes of guilt and resentment in the East. Moreover, the book discusses that how the themes of guilt and resentment composed the narrative genealogy of Chinese Literature the 20th century

Chastity and Politics: Chastity Stories and Women's Life in Taiwan in the Qing Dynasty

台湾早期的节烈故事主要和明清易代之际的政治动荡有关,并体现了史传作者的家国之痛。清政府治台之初就大力提倡节孝,一方面是为了将台人对明郑政权的感念转化为对新政权的认可与支持,同时也出于治理台湾移民社会之风化问题的现实需要。随着清政府旌表范围与规模的逐步扩大,台湾的节烈妇女在人数上急遽上升。同时,清代台湾的节烈妇女具有较广泛的社会代表性,透过她们的节烈故事,可以看到当时台湾的社会状况与妇女生活的情状。Taiwan's early chastity stories were closely related to the political unrest in the transitional period from the Ming to Qing Dynasty,which was reflected in the national trauma of the writers at that time. At the early stage of its administration in Taiwan,the Qing government began to energetically advocate women's chastity and filial piety in order to turn the gratitude of Taiwan people for Zheng Chenggong's political power in the Ming Dynasty into their recognition and support of the new regime in the Qing Dynasty. Meanwhile,the advocacy of chastity also proceeded from the actual need for the improvement of the social morals of Taiwan immigrants. With the gradual expansion of commendation scope and scale by the Qing government,the number of Taiwan chastity women had increased dramatically. On the other hand,as chastity is widely typical of the Taiwan women in society in the Qing Dynasty,it may help us through their stories understand better the social status and the women's life in that period of time.国家社科基金一般项目“清代文献中的台湾形象研究”(11BZW004