A functional-dependencies-based Bayesian networks learning method and its application in a mobile commerce system.

This paper presents a new method for learning Bayesian networks from functional dependencies (FD) and third normal form (3NF) tables in relational databases. The method sets up a linkage between the theory of relational databases and probabilistic reasoning models, which is interesting and useful especially when data are incomplete and inaccurate. The effectiveness and practicability of the proposed method is demonstrated by its implementation in a mobile commerce system.     

富氧氮氧化硅薄膜退火的研究

利用红外吸收(IR)谱和X射线光电子谱(XPS)对富氧氮氧化硅(oxygen-rich SiOxNy)及其在600、750和900℃下退火后样品的微结构进行了研究.实验中除观察到N、H的释放外,首次发现退火会导致SiOxNy中O的释放,同时还发现退火温度不同,H、O、N元素的释放量以及微结构的变化都不相同,根据这些现象,提出了5个化学反应过程并予以解释.     

Alcoholism at the time of injury among trauma center patients: Vehicular crash victims compared with other patients

A structured in-depth interview employing standardized criteria was used to determine the prevalence of lifetime and current alcohol dependence (alcoholism) in unselected consecutive patients admitted to a regional Level I trauma center. Of 629 patients, 157 (25.0%) were current alcoholics at the time of injury. An additional 87 (13.8%) were diagnosed as lifetime non-current alcoholics. There was no significant difference in the rates of current alcohol dependence among patients injured in vehicular crashes (23.5%), other unintentional trauma victims (29.3%), and those injured as a result of violence (24.6%). Of BAC + (blood alcohol concentration positive) patients, 54.5% were current alcoholics. However, 14.4% of alcohol-negative patients were also diagnosed as alcohol dependent.     

Variability in stepping direction explains the veering behavior of blind walkers.

Walking without vision results in veering, an inability to maintain a straight path that has important consequences for blind pedestrians. In this study, the authors addressed whether the source of veering in the absence of visual and auditory feedback is better attributed to errors in perceptual encoding or undetected motor error. Three experiments had the following results: No significant differences in the shapes of veering trajectories were found between blind and blindfolded participants; accuracy in detecting curved walking paths was not correlated with simple measures of veering behavior; and explicit perceptual cues to initial walking direction did not reduce veering. The authors present a model that accounts for the major characteristics of participants' veering behavior by postulating 3 independent sources of undetected motor error: initial orientation, consistent biases in step direction, and, most important, variable error in individual steps. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Truncation of CPC solar collectors and its effect on energy collection

Analytic expressions are derived for the angular acceptance function of two-dimensional compound parabolic concentrator solar collectors (CPC's) of arbitrary degree of truncation. Taking into account the effect of truncation on both optical and thermal losses in real collectors, we also evaluate the increase in monthly and yearly collectible energy. Prior analyses that have ignored the correct behavior of the angular acceptance function at large angles for truncated collectors are shown to be in error by 0–2% in calculations of yearly collectible energy for stationary collectors.     

Prolonged recovery of desiccated adenoviral serotypes 5, 8, and 19 from plastic and metal surfaces in vitro

BACKGROUND: Prevention of the spread of epidemic keratoconjunctivitis (EKC) at eye care facilities (doctors' offices, clinics, hospitals) has been a major public health goal for ophthalmology for more than 50 years. The authors explored a potentially contributing attribute of the adenovirus serotypes that cause EKC. Specifically, they investigated the capacity of different clinical and laboratory ocular serotypes (AD8, 19, and 5) to survive for extended periods of time in a desiccated state. METHODS: Twenty microliters containing 2000 plaque-forming units of different ATCC laboratory adenoviral ocular serotypes (AD8, 19, and 5) and clinical isolates (AD8 Cray, AD19 Kowalski, and AD5 McEwen) were inoculated onto 7-mm plastic disks and 6-mm aluminum foil disks and were allowed to completely desiccate. At weekly intervals up to 7 weeks, eight desiccated virus-inoculated plastic or metal disks per serotype were added to tissue culture medium, and the amount of recoverable virus was determined by plaque assay on A549 cells. RESULTS: Ocular adenoviral serotypes AD8, 19, and 5 could be recovered up to 49 days from plastic, and 35 to 49 days from metal. Sufficient virus concentrations (> 100 plaque-forming units/disk) to be clinically infectious were recovered up to 28 days. Differences in recovery among serotypes (AD19 > AD5, AD8) were demonstrated, but laboratory and clinical isolates of the same serotype were usually comparable. CONCLUSIONS: Ocular isolates of adenovirus that cause EKC are much harder than previously suspected, and the capacity to survive in a desiccated state may possibly play some role in office-based mini-epidemics of EKC.     

Terrestrial digital video broadcasting for mobile reception using OFDM

Performance of a system design for digital video broadcasting is examined with emphasis on mobile reception. Orthogonal frequency division multiplexing (OFDM) is used to achieve good bandwidth efficiency and to mitigate the intersymbol interference resulting from the channel delay spread. The resulting equivalent channel including OFDM can be modeled as a flat Rayleigh fading channel plus an interchannel interference (ICI) term due to the channel Doppler spread. This ICI term is analyzed and shown to result in an error floor. Performance improvements due to antenna diversity and trellis-coded modulation (TCM) are given. Finally, multiresolution modulation is discussed as a means of achieving graceful degradation and giving degrees of freedom for further performance improvement.This research was supported by the Multimedia Systems R & D Laboratory, Hitachi, Ltd.