思辨词及其辩证意义——钱钟书论“一字多义之同时合用”

黑格尔认为,具有相反两义且又同时合用的字词宜于思辨,我们将这种字词称之为"思辨词"。我国古代训诂学曾称之为"反训",但难于自圆其说。在《管锥编》中,钱钟书先生从体用有别的观点出发,厘清了多义词的种类,并对一字包含正反多义并同时合用的字词的辩证意义,进行了深入的阐发,指出思辨词是客观事物和人们观念情感等矛盾统一和矛盾转化的生动反映,表现了我们民族的高度智慧。     

RDS编码器的实现技术

介绍了广播数据系统（ＲａｄｉｏｎＤａｔａＳｙｓｔｅｍ，简称ＲＳＤ）利用现有调频立体声电台，在其基带频谱的上边界外（５７ｋＨｚ±２ｋＨｚ处）附加一块用ＤＰＳＫ方式调制的数据信息的频谱（一般称其为附加信近）多工地传送广播信息的基本原理，讨论了发端编码器的结构、实现方案以及波形成形截短的影响，并给出了一个实际模型。     

螺旋天线宽带阻抗匹配技术的研究

介绍了一种用渐变镜像传输线阻抗变换器来实现螺旋天线与50Ω馈线之间的宽带匹配技术.实验结果表明,采用渐变镜像传输线阻抗变换器能在2:1的频带范围内实现 ρ<2.     

Immigration,Ethnicity, and Conflict: The California Chinese, 1849–1882*

Drawing on Bonacich's split market theory, the work of Hechter and Blalock on ethnic conflict, and the literature on social movements, the authors develop a model of factors producing conflict between native and immigrant workers. The model identifies the relative size of the immigrant group, the growth of the immigrant population, the desirability of jobs held by immigrant workers, economic conditions, the development of racist ideology among native workers, and the organization of native workers as factors possibly explaining the frequency of incidents of overt ethnic conflict and efforts to institutionalize discrimination through government action. The model is assessed by examining the situation of Chinese immigrants in California between 1849 and 1882. The data suggest that poor economic conditions, a well-developed racist ideology, and well-organized native workers best explain incidents of ethnic conflict and successful efforts to obtain discriminatory government action.     

A note on information loss in analyzing a mixture model of count data

In this note we consider estimation of a mixture model of count data which is composed of two discrete random variables. Conditional and unconditional estimation procedures are given for estimating the unknown parameter(s) of interest using the likelihood function. Asymptotic relative efficiencies are given to examine the amount of information loss in using the two estimation procedures. Specifically, we study the change in asymptotic relative efficiency, if any, in different parameter settings.     

Linking dichotomous segregation with multi-group segregation: Weighted segregation ratios in selected U.S. metropolitan areas

The U.S. residential landscape is increasingly multi-racial and multi-ethnic, giving rise to the question of how to compare dichotomous segregation among multiple groups living in the same area. To address the problem in the existing dichotomous approach, which offers no common basis for comparing dichotomous segregation among multiple groups, this paper develops a weighted segregation ratio approach based on Theil’s segregation index and its additive decomposability. This approach can be used to bridge information obtained from dichotomous segregation between specific groups (such as black-white and black-Hispanic), and dichotomous segregation between group and non-group (such as white-non-white and black-non-black) in previous studies. We apply both dichotomous and weighted segregation ratio approaches to 1990 and 2000 U.S. census data. Results are interpreted for five selected metropolitan areas as well as for the weighted national average. This new approach yields distinctive findings that portray the complicated process of residential segregation, including the increasing significance of Hispanic segregation and Asian segregation in the decade from 1990 to 2000.     

Borrowing Information across Populations in Estimating Positive and Negative Predictive Values

A marker's capacity to predict risk of a disease depends on disease prevalence in the target population and its classification accuracy, i.e. its ability to discriminate diseased subjects from non-diseased subjects. The latter is often considered an intrinsic property of the marker; it is independent of disease prevalence and hence more likely to be similar across populations than risk prediction measures. In this paper, we are interested in evaluating the population-specific performance of a risk prediction marker in terms of positive predictive value (PPV) and negative predictive value (NPV) at given thresholds, when samples are available from the target population as well as from another population. A default strategy is to estimate PPV and NPV using samples from the target population only. However, when the marker's classification accuracy as characterized by a specific point on the receiver operating characteristics (ROC) curve is similar across populations, borrowing information across populations allows increased efficiency in estimating PPV and NPV. We develop estimators that optimally combine information across populations. We apply this methodology to a cross-sectional study where we evaluate PCA3 as a risk prediction marker for prostate cancer among subjects with or without previous negative biopsy.     

Out of Sight,Out of Mind? Patterns of Transnational Contact Among Chinese and Indian Immigrants in Toronto1

There has been considerable discussion in recent decades about the integration patterns of new immigrants. Recognizing advancements in technology and the increased economic integration of countries, some researchers have suggested that the emerging integration trend for immigrants is the transnational pattern, whereby immigrants maintain contact with the home countries. To advance the discussion, this study focuses on general transnational contact, a basic form of transnational activity. The study draws from recently collected large‐scale survey data to explore the patterns of transnational contact within two recent immigrant groups, Asian Indians and Chinese, in Toronto. Our findings show that only a small percentage of immigrants maintain intensive and extensive transnational contact. As well, our findings are less consistent with the transnational perspective than with the assimilation perspective on the effects of socioeconomic background on transnational contacts.     

Mathematical analyses of casino rebate systems for VIP gambling

In Macao, the VIP gaming revenue accounts for over two thirds of the total gaming revenue. Since the VIP gaming market is highly competitive, several incentives such as rebates are used to attract the VIP players. There are two commonly used rebate systems in the VIP gaming market: rebate on buy-in and rebate on actual loss. The analysis of rebate on buy-in is relatively easy. However, the analysis of rebate on actual loss is more complicated, which involves the Unit Normal Linear Loss Integral. Using empirical data, MacDonald derived a simple approximation formula for computing the rebate rate on actual loss. In this paper, we use mathematical analysis to derive more accurate approximation formulas for computing the rebate rate on actual loss. Some practical examples are given to compare the accuracies of these formulas. We also discuss how these two rebate systems affect the fluctuations of the results.