Electric wheelchair control system using brain-computer interface based on alpha-wave blocking

A brain-computer interface （BCI） -based electric wheelchair control system was developed, which enables the users to move the wheelchair forward or backward, and turn left or right without any pre-learning. This control system makes use of the amplitude enhancement of alpha-wave blocking in electroencephalogram （EEG） when eyes close for more than 1 s to constitute a BCI for the switch control of wheelchair movements. The system was formed by BCI control panel, data acquisition, signal processing unit and interface control circuit. Eight volunteers participated in the wheelchair control experiments according to the preset routes. The experimental results show that the mean success control rate of all the subjects was 81.3%, with the highest reaching 93.7%. When one subject＇s triggering time was 2.8 s, i.e., the flashing time of each cycle light was 2.8 s, the average information transfer rate was 8.10 bit/min, with the highest reaching 12.54 bit/min.     

TBM在富水带的施工技术措施

通过对TBM通过富水带的施工技术进行介绍,分析TBM在富水带施工对地下水的处理措施,详细论述超前阻水注浆施工,TBM在洞内排水措施及排水技术,并在实际应用中取得良好的效果。     

排球拦防一体化教学训练软件的开发研究

通过专家访谈、数学建模等方法,应用Visual Basic6.0、Access数据库等技术开发了 "排球拦防一体化教学训练软件",该软件具有排球比赛拦防一体化布局演示等功能,可作为教学训练的辅助工具,对拦防训练进行量化指导.尤其在启蒙教学训练中,培养青少年运动员精确的位置感,提高判断能力,为系统训练打下坚实的基础.     

Caller ID and the meaning of privacy

Caller ID service continues to be a controversial issue in the U.S. because of its privacy implications. State and federal regulators, legislators, scholars, and the courts have examined and responded to the privacy issue from a policy perspective, but perhaps without a complete understanding of the meaning of privacy in the context of the debate. What types of privacy are involved, how significant are these interests, and how might privacy needs compare and be balanced? This article explores privacy in the context of the Caller ID debate from a social science perspective. It examines motives for seeking and preserving privacy and explores the dynamic relationship between the caller and called party positions. It then provides an analysis of current and proposed Caller ID features and policies with a view toward understanding how these proposals balance competing privacy needs. This article establishes an analytic framework and a foundation for further study of caller and called party privacy that should lead to a better understanding of the privacy debate and the privacy implications of Caller ID.     

AHAB: Aligning heterogeneous knowledge bases via iterative blocking

With the development of information extraction, there have been an increasing number of large-scale knowledge bases available in different domains. In recent years, a great deal of approaches have been proposed for large-scale knowledge base alignment. Most of them are based on iterative matching. If a pair of entities has been aligned, their compatible neighbors are selected as candidate entity pairs. The limitation of these methods is that they discover candidate entity pairs depending on aligned relations, which cannot be used for aligning heterogeneous knowledge bases. Only few existing methods focus on aligning heterogeneous knowledge bases, which discover candidate entity pairs just for once by traditional blocking methods. However, the performance of these methods depends on blocking keys heavily, which are hard to select. In this paper, we present an approach for aligning heterogeneous knowledge bases via iterative blocking (AHAB) to improve the discovery and refinement of candidate entity pairs. AHAB iteratively utilizes different relations for blocking, and then matches block pairs based on matched entity pairs. The Cartesian product of unmatched entities in matched block pairs forms candidate entity pairs. By filtering out dissimilar candidate entity pairs, matched entity pairs will be found. The number of matched entity pairs proliferates with iterations, which in turn helps match block pairs in each iteration. Experiments on real-world heterogeneous knowledge bases demonstrate that AHAB is able to yield a competitive performance.     

疏通灌注桩水下混凝土堵管新法

在灌注桩水下混凝土发生堵管时,传统的处理方法主要是采取提掷导管以疏通之。但发生堵管,有的是假性堵管,有的是真性堵管。处理堵管传统方法对假性堵管可以疏通;对真性堵管则难以疏通。若提掷无效则需进行二次初灌,不仅费工费时,而且容易产生断桩。文章根据物理学力的平衡原理,借鉴传统的处理方法,提出将混凝土导管暂时拔出混凝土面的泥浆中进行快速提掷管疏通办法,并通过某工程案例进行钻芯检测。检测数据表明,该办法可行。     

论李天佑在新圩阻击战中的担当精神

新圩阻击战是湘江战役的一部分。为了掩护党中央安全渡过湘江,在新圩阻击战中,年仅20岁的红三军团第五师师长李天佑,团结部属,指挥仅有的两个团加一个炮兵营,通观全局、选好战场,亲临战阵、巧妙布兵,临危不惧、指挥若定,沉着冷静、灵活机动,不惜一切代价、顽强坚守,把凶恶的敌人挡在湘江岸边,胜利地完成了阻击任务。李天佑勇于担当和善于担当的精神永远值得弘扬与学习。     

NGO参与多元协作式公共危机治理的阻滞因素与实现策略

面对日益频发、多元、复杂的公共危机,以政府为唯一管理主体的公共危机应急管理机制显得捉襟见肘,构建多元协作式公共危机治理机制,成为解决政府应对公共危机弊病的妙药.非政府组织凭借自身优势,成为多元协作式公共危机治理的重要主体.因此,应该以多元协作式公共危机治理机制为目标,结合我国社会实际情况,从内部与外部两个方面来研究非政府组织参与多元协作式公共危机治理的阻滞因素,从法律建设、治理机制构建、激励与监督机制建设三个方面来促进非政府组织对公共危机治理的参与.     

浅析沙滩排球拦网技术的训练与运用

沙滩排球6大技术（发球、垫球、传球、扣球、拦网、防守）中,拦网是最容易学的一项技术,只要能跳,不触网就可以上去拦网了。所以初学沙滩排球的人经常会有拦网是最简单的技术的错觉。实际上拦网是一项和其他各项技术相比最复杂的技术,因为它的特点是拦网队员要在短短的瞬间从防守转为进攻,从被动转为主动,而完成这些都要在空中进行,所以难度较大,技术的要求也很高,而且拦网的好坏并不仅仅取决于身体素质和技术的好坏,很重要的一方面是在比赛中有针对性的临场运用。以下通过对第11届全运会沙滩排球比赛拦网统计的比较,对拦网这项技术在沙滩排球比赛中的应用、注意事项以及一些训练方法做一个分析和概括。     

从康德义务论的角度看动物保护志愿者拦车救狗的行为

从康德义务论的角度针对动物保护志愿者拦车救狗的行为进行分析,指出志愿者的这种行为不符合康德的善良意志,并且违反了绝对命令,是不道德的行为。志愿者应采取合法的方式保护动物。