Theoretical considerations on small color differences ascribed to the standard observer made on the basis of individual color‐matching functions

An analytical method to determine how color‐matching functions influence the perception of chromaticity differences is proposed. We show that, as a consequence of the observer metamerism, a metameric color‐match perceived by one observer may appear to be a significant mismatch to a different observer. It is also shown that, on average, the differences between the color‐matchings made by two different observers can be estimated to be in the order of 2 CIELAB units. © 2009 Wiley Periodicals, Inc. Col Res Appl, 34, 194–200, 2009     

船闸输水基本方程的应用

根据总流非恒定流的能量方程推导了船闸输水基本方程,对某船闸灌水过程进行了数值模拟。由于输水系统存在惯性,在灌水后期闸室水位出现反向水头即超高,当闸室水位从最大超高开始下降,水体从闸室流向引航道,此时,基本方程中水头损失项必须取与阀门处流速相同的符号。建议在相关规范修订时,将船闸输水基本方程改为文中推荐的公式,以便于应用。     

Sorting-Based Calculation of Zeroes and Extrema of Functions as Applied to Search and Recognition. I

A stable address sorting is used for approximate calculation of zeroes and extrema of functions of one variable and two variables. In particular, the paper gives a new method for localization and approximate calculation of all the roots of a polynomial with arbitrary power. The method includes poorly separated roots, and its distinctive features are the computational stability and the maximum parallelism.     

我国线接触股钢丝绳渊源及结构参数计算程序

介绍我国线接触股钢丝绳的由来、发展过程和品种范围。鉴于钢丝绳增加品种和需用7.0以下的低捻距倍数捻股等要求,编制了线接触股程序,该程序可自动生成捻距倍数为6～10的多种结构。以西鲁式股为例,在某一捻距倍数时,给出线接触股钢丝绳技术参数的关系和相应的计算公式,计算精度达小数点后4位有效数字。介绍所应用的编程软件和代表品种计算程序的模式,使用该程序能输出所列线接触股全系列的基本参数和捻制参数。     

Selection of a representative value function in robust multiple criteria sorting

We introduce the concept of a representative value function in robust ordinal regression applied to multiple criteria sorting problems. The proposed approach can be seen as an extension of UTADIS^GMS, a new multiple criteria sorting method that aims at assigning actions to p pre-defined and ordered classes. The preference information supplied by the decision maker (DM) is composed of desired assignments of some reference actions to one or several contiguous classes—they are called assignment examples. The robust ordinal regression builds a set of general additive value functions compatible with the assignment examples and results in two assignments: necessary and possible. The necessary assignment specifies the range of classes to which the action can be assigned considering all compatible value functions simultaneously. The possible assignment specifies, in turn, the range of classes to which the action can be assigned considering any compatible value function individually. In this paper, we propose a way of selecting a representative value function among the set of compatible ones. We identify a few targets which build on results of the robust ordinal regression and could be attained by a representative value function. They concern enhancement of differences between possible assignments of two actions. In this way, the selected function highlights the most stable part of the robust sorting, and can be perceived as representative in the sense of robustness preoccupation. We envisage two possible uses of the representative value function in decision support systems. The first one is an explicit exhibition of the function along with the results of the UTADIS^GMS method, in order to help the DM to understand the robust sorting. The other is an autonomous use, in order to supply the DM with sorting obtained by an example-based procedure driven by the chosen function. Three case studies illustrating the use of a representative value function in real-world decision problems are presented. One of those studies is devoted to the comparison of the introduced concept of representativeness with alternative procedures for determining a single value function, which we adapted to sorting problems, because they were originally proposed for ranking problems.     

Reliability estimation in Lindley distribution with progressively type II right censored sample

In this paper we discuss one parameter Lindley distribution. It is suggested that it may serve as a useful reliability model. The model properties and reliability measures are derived and studied in detail. For the estimation purposes of the parameter and other reliability characteristics maximum likelihood and Bayes approaches are used. Interval estimation and coverage probability for the parameter are obtained based on maximum likelihood estimation. Monte Carlo simulation study is conducted to compare the performance of the various estimates developed. In view of cost and time constraints, progressively Type II censored sample data are used in estimation. A real data example is given for illustration.     

Effect of the delta-aminolevulinic acid dehydratase gene polymorphism on renal and neurobehavioral function in workers exposed to lead in China

Effects of delta-aminolevulinic acid dehydratase (ALAD) polymorphisms on the renal and neurobehavioral functions were investigated in Chinese workers from a storage battery plant exposed to inorganic lead. Blood and urine were collected from each worker to determine the ALAD genotypes, blood lead levels (PbB), urinary β2-MG and urinary NAG activity. The World Health Organization Neurobehavioral Core Test Battery (WHO-NCTB) was used. Of the 135 lead workers tested for ALAD genotype, 126 were ALAD1-1, 9 were ALAD1-2 but none were ALAD2-2. The gene frequencies of ALADl-1 and ALADl-2 were 93.33% and 6.67%, respectively. The workers with ALAD1-2 genotype had significantly higher concentrations of PbB (62.52 µg/dl vs. 41.02 µg/dl), urinary NAG (22.01 U/gCr vs. 13.49 U/gCr), urinary β2-MG (194.98 μg/gCr vs. 112.88 μg/gCr), and digit span backward (DSB) score (6.67 vs. 5.33) than those of ALAD1-1 genotype. Urinary NAG of ALAD1-2 genotype carriers was significantly higher than that of ALAD1-1 genotype under the same blood lead level (b_i 0.75 vs. b_i 0.29). Interaction between PbB and ALAD genotypes has a significant influence on NAG (P = 0.02) and β₂-MG (P = 0.01). It is postulated that the workers with the ALAD2 allele appear to be more susceptible to the effects of lead on renal injury, whereas neurobehavioral functions in ALAD1 homozygote tend to be more vulnerable.     

Spline approximate solution of eighth-order boundary-value problems

We use non-polynomial spline functions to develop numerical methods for the solution of the eighth-order linear boundary-value problems. End conditions of the spline are derived. We compare our results with the results produced by decomposition method and polynomial spline method. However, it is observed that our approach produce better numerical solutions in the sense that max |e _i | is minimum.     

Bandlet image estimation with model selection

To estimate geometrically regular images in the white noise model and obtain an adaptive near asymptotic minimaxity result, we consider a model selection based bandlet estimator. This bandlet estimator combines the best basis selection behavior of the model selection and the approximation properties of the bandlet dictionary. We derive its near asymptotic minimaxity for geometrically regular images as an example of model selection with general dictionary of orthogonal bases. This paper is thus also a self-contained tutorial on model selection with orthogonal bases dictionary.     

Excel在电力企业同业对标指标评价中的运用

利用Excel统计函数功能强大、易于理解、操作简单的优点,对其在同业,对标指标评价中的运用进行探讨和研究,并以电网调度运行指标为实例,方便快捷地实现同业对标指标评价过程,且评价结果准确、可靠.同时,该方法还可以用于解决其它领域的指标评价问题,具有较强的实用性,有一定的推广价值.