三亚回族多语现象回访及分析

“回访”是文化人类学针对同一调查点进行长期跟踪调查的重要方法之一.本文主要就海南三亚回族多语现象进行回访调查,并同1984年的调查结果进行对比分析,找出当地回族掌握多语情况的变化及原因和特点.     

Trade-off between quoted lead time and price

In a make-to-order environment, lead time and price can play a crucial role in determining the financial success of a firm. Their importance increases when demand is sensitive to the quoted lead time and price. A model is presented which uses the quoted lead time and price as a mechanism to determine the optimal demand level. The relationships between the model parameters and their impacts on the firm's profit is also analysed. In addition, the effect of the number of job requests, and the mean processing time are examined. Based on the results presented in this paper, there is clear indication that the firm's profit is sensitive to the inventory holding rate, and that the inventory holding cost component is redundant in the presence of a tardiness cost component.     

A Likelihood-Based Approximation to the Cumulative Distribution Function of the Noncentral t Distribution

Optimal designs for estimating the parameters and also the optimum factor combinations in multiresponse experiments have been considered by various authors. However, till date, in mixture experiments optimum designs have been studied only in the single response case. In this article, attempt has been made to investigate optimum designs for estimating optimum mixing proportions in a multiresponse mixture experiment.     

Family Control and Stock Market Reactions to Innovation Announcements

Although family firms are common around the world, studies on family‐controlled business are limited. Prior studies mainly focused on the influences of family ownership on overall firm performance, and the results were mixed. In this study we attempted to explore the impacts of family ownership on innovation by examining the association of family control and stock market reactions to innovation announcements. We found that firms with greater family control experienced significantly more negative stock market reactions to innovation announcements. The results further indicated that divergence of cash flow and voting rights was strongly and negatively correlated with announcement‐period abnormal returns. In addition, the findings suggested a significantly positive moderating effect of institutional ownership. The conclusions were robust under various measures of family control, and remained valid after controlling other influential factors for stock market reactions to innovation announcements.     

Psychometric testing of the Chinese version of ISPCAN Child Abuse Screening Tools Children's Home Version (ICAST-CH-C)

BackgroundChild maltreatment is a global problem and the true extent remains unknown. The International Society for the Prevention of Child Abuse and Neglect (ISPCAN) Child Abuse Screening Tool — Children's Home version (ICAST-CH) has provided accurate assessment of the scope and prevalence of child maltreatment. Yet measures of children's experiences of child maltreatment are limited in the Chinese population.ObjectivesThe study aimed to translate and validate a Chinese version of the ISPCAN Child Abuse Screening Tool — Children's Home version (ICAST-CH) and to evaluate its reliability and validity among Taiwan adolescents.MethodsA three phase study was conducted. In phase 1, the ICAST was translated into Chinese using forward–backward translation procedures with the translation equivalence and content validity assessed. In phase 2, the data provided by a convenience sample of 98 adolescents was used to assess the internal consistency of the ICAST-CH Chinese version (ICAST-CH-C). In phase 3, the psychometric properties of the ICAST-CH-C were tested with a nationwide random sample of 5236 adolescents from 35 schools.ResultsThe translation equivalence and content validity index of the ICAST-CH-C was satisfactory. The inter-rater agreements were .90–.91 for comparability of language and .89–.94 for similarity of interpretability. Results indicated that the ICAST-CH-C had a high level of equivalence with the original English version and demonstrated a high internal consistency (.71–.89). Confirmatory factor analysis revealed the presence of five factors supporting the conceptual dimension of the original instrument.ConclusionThis study provided initial psychometric properties of the ICAST-CH-C and supports it as a reliable, valid, and highly usable instrument to identify childhood victimization in adolescents. It provided health care professionals with a useful tool to assess the severity and prevalence of child maltreatment within Chinese communities.     

Impact of investing in quality improvement on (Q,r, L) model involving the imperfect production process

This paper investigates the impact of quality improvement on the modified lot size reorder point models involving variable lead time and partial backorders. The formulated models include the imperfect production process and an investing option of improving the process quality. The objective is simultaneously optimizing the lot size, reorder point, process quality level and lead time. We first assume that the lead time demand follows a normal distribution, then relax this assumption to consider the distribution-free case where only the mean and standard deviation of lead time demand are known. An algorithm procedure of finding the optimal solution is developed, and two numerical examples are given to illustrate the results.     

三维有限元渗流模拟计算在蟒河口水库防渗设计中的应用

蟒河口水库工程天然来水量较小，开发目标高，采取有效的防渗处理措施才能保证水库开发要求的蓄水量．工程中采用三维有限元渗流模拟计算对防渗处理措施进行复核．根据计算结果，对防渗措施进行调整、优化，确定了经济、高效的防渗方案．通过工程经验类比知，计算所采用的方法和最终得到的结果是满意的．     

粗集与神经网络相结合的股票价格预测模型

粗集和神经网络结合反映了人类智能的定性和定量、清晰和隐含、串行和并行相互交叉混合的常规思维机理。本文建立这样一种混合杂交模型用于股票价格波动趋势的预测,通过粗集对数据的二维约简预处理消除了样本中的噪声和冗余,在提高神经网络预测精度的同时降低了学习负担。为了获得最优的预测精度,本文还利用遗传算法进行属性离散化和网络学习。通过对上证综指的实证研究表明,这种混合杂交模型的性能明显优于BP和GA神经网络模型。