SHOPLIFTING REDUCTION THROUGH THE USE OF SPECIFIC SIGNS

No abstract available for this article.     

基于数字照相技术的边坡变形自动化监测技术研究

将数字摄影测量技术应用于边坡位移自动监测。在边坡上布设固定标志点，将非量测数码相机置于边坡正面，运用程序控制相机间隔一定时间对边坡进行拍摄。对拍摄图像预处理后使用圆心亚像素识别算法确定测点亚像素位置。根据标志初始实际距离与初始相片像素距离建立物象比例，对比各次识别结果得到各测点实际的相对位移。运用GPS技术和计算机技术，本系统可实现数据交换、控制指令发送和预警的适时监控。本系统采用非量测数码相机，相对于传统边坡检测方法具有成本低，精度高，需要人工干预少等优点，现场试验50 m距离识别精度达到3 mm，取得较好效果，可以作为大量边坡自动化监测的有效手段。     

Bayesian autoregressive spectral analysis

The article describes an operational Bayesian approach to making inferences for the spectral density function for univariate autoregressive processes and for the AR operator of multivariate autoregressive processes. The derivation of the approach is described. Numerical examples, including the Wolfer Sunspot numbers, are used to demonstrate the practical usefulness of the approach.     

高校经济性腐败临界行为及机理研究

教育腐败危及公平和社会公信力，目前，高校腐败已经成为整个社会关注的热点。文章以博弈经济学的视角，分析了高校监督者和高校从业者之间的博弈关系，揭示了高校经济性腐败的临界行为，研究表明，高校从业者临界收益与监督概率、从业者收入、贴现因子及从业者任期正相关，与从业者风险好恶系数负相关，高校监督者临界监督成本与背德未被发现时收益、从业者收入、背德概率、贴现因子及从业者任期正相关，与监督者风险好恶系数负相关，在此基础上，提出应采取选择品德高尚的高校从业者、提高腐败成本、建立有效的监督和激励机制等预防高校腐败的措施。     

ARFIMA processes and outliers: a weighted likelihood approach

In this paper, we consider the problem of robust estimation of the fractional parameter, d, in long memory autoregressive fractionally integrated moving average processes, when two types of outliers, i.e. additive and innovation, are taken into account without knowing their number, position or intensity. The proposed method is a weighted likelihood estimation (WLE) approach for which needed definitions and algorithm are given. By an extensive Monte Carlo simulation study, we compare the performance of the WLE method with the performance of both the approximated maximum likelihood estimation (MLE) and the robust M-estimator proposed by Beran (Statistics for Long-Memory Processes, Chapman & Hall, London, 1994). We find that robustness against the two types of considered outliers can be achieved without loss of efficiency. Moreover, as a byproduct of the procedure, we can classify the suspicious observations in different kinds of outliers. Finally, we apply the proposed methodology to the Nile River annual minima time series.     

Sums of weighted spacings and a test for the logistic distribution

A simple proof for a theorem of Csörgö and Révész (1981b and 1984) concerning sums of weighted spacings is given, The conditions of the theorem are relaxed. As an application, a goodness-of-fit test for the logistic distribution is proposed. The percentage points of the proposed test statistic are obtained by a simulation experiment.     

Confidence Intervals for Linear Combinations of Poisson Means

Parametric confidence intervals are given for linear combinations of the means of independent Poisson variables and for their continuous versions. The performance of the intervals is assessed using simulation. A real data set is used to compare the proposed intervals with known ones. The proposed intervals are shown to be superior to known ones and comparable to exact intervals.     

Fire Risks in Oil Refineries: Economic Analysis of Camera Monitoring

A probabilistic method is presented to evaluate the economic value of fire monitoring by closed circuit TV camera in petroleum refineries. The proposed model is restricted to the analysis of risk reduction in an area where fires can be caused either by pump failure or by failure of valves and lines. The benefits come from reducing the time during which the fire grows undetected. Fire growth and expected values of losses are analyzed by a Markov model that includes five phases: (1) active undetected growth, (2) detection, (3) fire growth at the beginning of the firemen's intervention, (4) fire control, and (5) fire extinction. The results (e.g., the expected net present value of the investment) show that the proposed monitoring investment is attractive for an illustrative example.     

国际人权公约的法律监督

从有政治和道义价值的人权宣言在条件成熟时发展为有法律约束力的人权公约 ,对促进国际人权合作有积极意义。公约的法律监督以审评缔约国关于本国人权状况的报告为主 ,形成一套机制和操作程序 ,强调专家监督机构与缔约国间的对话。这与借人权之名搞政治对抗 ,是不同的。公约体制的实施是国际监督和尊重国家主权间取得某种平衡的过程