Interfacing human and computer with wireless body area sensor networks: the WiMoCA solution

Wireless Body Area Sensor Networks (WBASN) are an emerging technology enabling the design of natural human–computer interfaces (HCI). Automatic recognition of human motion, gestures, and activities is studied in several contexts. For example, mobile computing technology is being considered as a replacement of traditional input systems. Moreover, body posture and activity monitoring can be used for entertainment and health-care applications. However, until now, little work has been done to develop flexible and efficient WBASN solutions suitable for a wide range of applications. Their requirements pose new challenges for sensor network designs, such as optimizing traditional solutions for use as environmental monitoring-like applications and developing on-the-field stress tests. In this paper, we demonstrate the flexibility of a custom-designed WBASN called WiMoCA with respect to a wide range of posture and activity recognition applications by means of practical implementation and on-the-field testing. Nodes of the network mounted on different parts of the human body exploit tri-axial accelerometers to detect its movements. The advanced digital Micro-electro-mechanical system (MEMS) based inertial sensor has been chosen for WiMoCA because it demonstrated high flexibility of use in many different situations, providing the chance to exploit both static and dynamic acceleration components for different purposes. Furthermore, the sensibility and accuracy of the sensing element is perfectly adequate for monitoring human movement, while keeping cost low and size compact, thus meeting our requirements. We implemented three types of applications, stressing the WBASN in many aspects. In fact, they are characterized by different requirements in terms of accuracy, timeliness, and computation distributed on sensing nodes. For each application, we describe its implementation, and we discuss results about performance and power consumption.

甘肃景电灌区次生盐化土壤的性质及其发生机理

本文对甘肃景电灌区次生盐化土壤的理化性质进行了研究 .该区次生盐渍化土壤主要为硫酸盐氯化物和氯化物硫酸盐型 ,水溶性钠离子在阳离子中占绝对优势 .土壤通体碳酸钙含量很高 ,并有少量的石膏 .钠离子饱和度很高 ,具有钠质特性或钠质化现象 ,盐化与钠质化同时进行 .在此基础上对次生盐渍化的机理和改良进行了讨论     

中国环科线虫的主要寄主植物种类和地域分布研究

从2773份植物根际土的线虫标本中获得环科线虫标样648份,主要分布在中国的17个省区73个市县的67科189属246种寄主植物的根际土中。其中环科线虫在中国的寄主范围和地域分布均有很广泛,除西藏自治区和青海无报道外,其他各省区均有发现,发现环科数量较多的有8省31市县和地区,该线虫不但在玉米、大豆等各种作物根围发现,而且在各类花卉、树木、杂草等根际也广泛存在。     

认真深入做好前期工作确保三峡工程顺利兴建

三峡工程建设,无论是防洪,发电、航运其工程规模极其巨大,而且工程建设地处我国人口密集、经济相对较发达的长江干流上游最下部河段上;为此,工程建设的前期工作更应较全面深入周密细致,充分考虑方方面面的利害得失,正确地反映工程建设的经济效益。在开发性移民方针下,做好水库淹没损失的合理补偿和移民安置,不留后患。长江上游年年发生洪水造成灾害,工程设计应考虑在水库调洪运行中给上游带来的洪涝灾害淹没损失应得到相应的赔偿。执行《水法)对水资源的有偿使用经济收益的分配是一个有待探讨的问题。     

广西镇龙山金（银）矿的构造控制特征

本文阐述了广西镇龙山金（银）矿化集中区内主要断裂构造的基本特征,并指出,其中规模较大的,与矿化关系较密切的主要是近ＥＷ向,次为近ＳＮ向断裂,它们组合成线状,交叉状和放射状断裂带,并严格控制着区内岩浆岩、矿化带、矿脉、矿体和“富矿包“的空间展布。这对找矿评价和预测盲矿体都具有实际意义。     

大宁调蓄水库工程建设管理概述

详细介绍了大宁调蓄水库建设过程中的工程管理和施工质量控制措施,以便为类似工程建设提供参考。     

中国西南易旱地区识别的探讨

利用中国西南地区13个气象站56年以上的长系列月降雨量资料,统计分析了降雨的多年变化、季节变化特征,以及连续少雨时间段事件,探讨了易旱区识别的定性定量分析方法,初步建立了气象易旱区识别指标及标准,将5个地区识别为易旱地区,5个地区识别为较易旱地区,3个地区识别为不易旱地区,将6个地区识别为易发长时间干旱地区,并对识别方法进行了讨论,为进一步的易旱区综合识别研究提出了建议。     

Discrete choice in commuter space: Small area analysis of diurnal population change in the Tokyo Metropolitan Region

Considerations of metropolitan commuting have often related to urban space as a continuum, and to commuting itself as a process. This approach has led to escalating complexity in the measurement, modeling and analysis of commuting, often with no commensurate results. The present study extends an alternative approach that considers commuter space of a metropolis as a discrete set of small areas. Each small area throughout the metropolis is a nighttime location of some households and, as a possible discrete destination choice of individuals within households, each subarea is also a daytime location of some persons. Each subarea, therefore, may be thought of as attaining two values, corresponding to its daytime (e.g., noontime) and nighttime (e.g., midnight) populations. The diurnal demographic shift of subareas, as a set of binary events, or toggles, between daytime and nighttime populations, is associated with commuter access throughout the metropolis. Diurnal shift offers structural simplicity aimed at estimating small-area daytime populations across a metropolitan region that might suitably precede and complement conventional continuum considerations of commuting. Using data for the Tokyo Metropolitan Region, we identify average household size as the nighttime indicator of small-areas, and daytime population density as their daytime indicator. The potential for the estimation of daytime populations across metropolitan regions where daytime population data are unavailable, is underscored by the clear tendency towards inverse relation of these two indicators of diurnal shift.     

Interactive Ray Tracing of Large Models Using Voxel Hierarchies

We propose an efficient approach for interactive visualization of massive models with CPU ray tracing. A voxel‐based hierarchical level‐of‐detail (LOD) framework is employed to minimize rendering time and required system memory. In a pre‐processing phase, a compressed out‐of‐core data structure is constructed, which contains the original primitives of the model and the LOD voxels, organized into a kd‐tree. During rendering, data is loaded asynchronously to ensure a smooth inspection of the model regardless of the available I/O bandwidth. With our technique, we are able to explore data sets consisting of hundreds of millions of triangles in real‐time on a desktop PC with a quad‐core CPU.