Toward Energy-Efficient and Trustworthy eHealth Monitoring System

The rapid technological convergence between Internet of Things(IoT),Wireless Body Area Networks(WBANs)and cloud computing has made e-healthcare emerge as a promising application domain,which has significant potential to improve the quality of medical care.In particular,patient-centric health monitoring plays a vital role in e-healthcare service,involving a set of important operations ranging from medical data collection and aggregation,data transmission and segregation,to data analytics.This survey paper firstly presents an architectural framework to describe the entire monitoring life cycle and highlight the essential service components.More detailed discussions are then devoted to {\em data collection} at patient side,which we argue that it serves as fundamental basis in achieving robust,efficient,and secure health monitoring.Subsequently,a profound discussion of the security threats targeting eHealth monitoring systems is presented,and the major limitations of the existing solutions are analyzed and extensively discussed.Finally,a set of design challenges is identified in order to achieve high quality and secure patient-centric monitoring schemes,along with some potential solutions.     

“至上”与“虚无”

<正>俄国画家马列维奇是"至上主义"抽象绘画流派的创始者,其绘画作品简约而纯粹,以最简单的形式——方块展现出艺术家丰富的感情世界,探索了形体、色彩与空间的关系。而同样善于运用几何形态的西班牙雕塑家奥泰萨的风格则显得冷静而克制,其雕塑作品通常看起来虚幻而抽象,没有强烈的情感表现,以高度理性化的手法展现出一种"虚无"的艺术境界。二人所专注的领域虽有不同,但他们的作品都在关注形式与其所在空间之间的复杂关系。     

Strain rate dependency and fragmentation pattern of expanding warheads

For the characterization of the behaviors of a metal material in events like expanding warheads, it is necessary to know its strength and ductility at high strain rates, around 104e105/s. The flyer plate impact testing produces the uniform stress and strain rates but the testing is expensive. The Taylor test is relatively inexpensive but produces non-uniform stress and strain fields, and the results are not so easily inferred for material modeling. In the split-Hopkinson bar(SHB), which may be used in compression, tension and torsion testing, the strain rates never exceeds 103/s. In the present work, we use the expanding ring test where the strain rate is 104e105/s. A streak camera is used to examine the expanding ring velocity, and a water tank is used to collect the fragments. The experimental results are compared with the numerical simulations using the hydrocodes AUTODYN, IMPETUS Afea and a regularized smooth particle(RSPH) software. The number of fragments increases with the increase in the expansion velocity of the rings. The number of fragments is similar to the experimental results. The RSPH software shows much the same results as the AUTODYN where the Lagrangian solver is used for the ring. The IMPETUS Afea solver shows a somewhat different fragmentation characteristic due to the node splitting algorithm that induces pronounced tensile splitting.     

衍射光学元件用于光学图像加密

密码技术是信息安全的核心技术，其作用在于对文字、声音和图像等三类信息实行保密存储、保密传输、安全认证、身份鉴别和安全控制．由于光学系统具有高速并行处理能力以及可调制参量多等优点，将光学与现代密码学相结合，研究光学系统、理论和方法用于图像加密和解密，已成为一个非常重要的研究领域。     

直流成套设备镉镍电池故障检测方法

直流成套设备镉镍电池故障检测方法山东矿院济南分院公茂法山东省蒙阴电器厂石增海１蓄电池故障检测的必要性１．１镉镍蓄电池直流系统应用概况近１０多年来，我国在福镍蓄电池直流系统成套装置的科研、设计、制造等方面有了很大地发展，其产品不仅在中小型火电厂、水电站...     

毛石基础砌体施工中质量问题及解决措施

毛石抗压强度高，抗冻性和耐腐蚀性好，价格低，又可就地取材。一般地区除了特殊的地质条件外，均采用毛石基础。 基础是建筑物或构筑物最基层的承重结构部分。所以要求毛石砌体必须保证足够的强度、刚度和稳定性。毛石砌体的整体强度主要取决于毛石的强度、砂浆的强度及砂浆与毛石间的粘结力，而毛石砌体的组砌方式，搭接长度等也是影响砌体强度的主要因素，施工中如不予以足够的重视。就会导致砌体强度降低，造成工程质量事故。笔者就多年来在施工中常出现的质量问题和保证砌体质量的措施，谈一下自己的看法。 一、毛石基础砌体常见的质量…     

明年空调谈什么？

这几年对中国空调行业来说,已经经历了 太多的风雨,有市场层面的洗牌,有国家宏观 调控下强制节能标准的关卡,有家电行业标 准限制的噪音门槛,有国际贸易市场中的反 倾销壁垒……等等,还有前些时候欧盟环保 双指令WEEE＆RoHS的出台,并且最近欧盟又 传来了声音,环保指令《关于报废电气电子设 备指令》正式实施,这预示着对我国空调行业 将提出越来越高的要求,空调产品必需承担越 来越多的责任。这就如同110米跨栏一样,每 年空调商都得面对几个必需跨越栏杆,每年都 会有多个厂家成为奥运会中被栏杆绊倒的阿兰 约翰逊,这结果就使得空调品牌集中度的不断 提高,从两年前的一百多家到今年的几十家, 并且这还是进行时。     

倾斜条带开采有限元模拟研究

使用有限元数值模拟的方法对米村矿倾斜条带开采的保留煤柱受力状况、岩层移动的参数及条带开采的开挖步骤进行了模拟研究，为煤矿进行建筑物下倾斜条带开采提供参考依据。