论传统相关产品市场界定方法在互联网即时通讯软件相关产品市场界定的适用

随着互联网产业竞争的日益加剧,互联网企业滥用市场支配地位案件也层出不穷,而＂奇虎360诉腾讯QQ垄断案＂就是其中的典型案例。在该案中,腾讯QQ作为一种互联网即时通讯软件,其相关产品市场的界定是本案的争议焦点之一,也是难点之一。学界有观点认为,由于互联网行业中用户锁定效应、零价格、双边市场的存在,传统的反垄断相关产品市场界定方法无法有效界定本案的相关产品市场。通过对该案的具体案情、特征进行分析,传统的相关产品市场界定方法仍能在本案中适用,本案中腾讯QQ这一互联网即时通讯软件的相关产品市场是＂在线交流服务市场＂。     

书评中“I”和“we”用法的对比研究

本文以30篇书评为语料,结合定性和定量的方法对比书评中＂I＂和＂we＂体现的作者权力。研究结果表明,书评中的＂I＂多用于发表评价性言论,而＂we＂则多用于对书的客观性介绍,＂I＂比＂we＂体现的作者权力更大。     

铁路工程建设水土流失预测研究

随着铁路建设步伐的加快，铁路建设过程中引起的水土流失问题日益受到重视，以包兰线包头至惠农段电气化改造工程为研究对象，分析了沿线水土流失形式，确定了流失量，并对预测结果进行了总结。     

Import competition and job displacement: A case study of Korean manufacturing industries

This paper investigates the impact of import competition on job displacement in Korean manufacturing industries. Using a regression model for the period of 1993–2003, the empirical results show that import competition raises the job displacement rate in the Korean manufacturing sector but the elasticity is negligible in its magnitude. Worker characteristics, such as gender, age, job tenure, and education level, proved to be significant in determining the displacement rate. Characteristics of displaced workers in high import-competing industries are also investigated based on the survey data. Workers who lost their jobs in these sectors were slightly older, less educated, and had longer job tenure than the workers in the other groups.     

Single Parenthood and Children’s Reading Performance in Asia

Using the data from Program for International Student Assessment, I examine the gap in reading performance between 15‐year‐old students in single‐parent and intact families in 5 Asian countries in comparison to the United States. The ordinary least square regression analyses show negligible disadvantages of students with a single parent in Hong Kong and Korea, once students’ demographic characteristics and socioeconomic background are held constant. Students in single‐parent families in Indonesia and Thailand outperform their peers in intact families. The negative effect of single parenthood remains significant in Japan, even after parent‐child communication is controlled. Interpreting the weak effect of single parenthood in the Asian countries, I consider extended family systems and the relatively high proportion of widowhood among causes of single parenthood.     

Who is Appointed to What Position? The Politics of Appointment in Quangos of Korea

This study identifies the determinants of appointment of executives in quangos. Using data from 85 quangos in Korea over 15 years between 1993 and 2007, we investigate the degree to which various characteristics of organizational actors affect the choice of executives. Three organizational actors include presidents, sponsoring government departments, and the concerned quangos. Although results vary by executive position, the findings of the empirical analysis with multinomial probit and generalized linear mixed models support the idea that the appointment of quango executives is not the result of presidential choice but that of the interactions among the key organizational actors, with different incentives and resources, on the appointment. Compared to former bureaucrats, presidential allies are more likely to be appointed when presidents have more political support from the National Assembly and it is easier for insiders to be promoted as executives from larger and older quangos with clear legal origins.     

Dimension-wise sparse low-rank approximation of a matrix with application to variable selection in high-dimensional integrative analyzes of association

Many research proposals involve collecting multiple sources of information from a set of common samples, with the goal of performing an integrative analysis describing the associations between sources. We propose a method that characterizes the dominant modes of co-variation between the variables in two datasets while simultaneously performing variable selection. Our method relies on a sparse, low rank approximation of a matrix containing pairwise measures of association between the two sets of variables. We show that the proposed method shares a close connection with another group of methods for integrative data analysis – sparse canonical correlation analysis (CCA). Under some assumptions, the proposed method and sparse CCA aim to select the same subsets of variables. We show through simulation that the proposed method can achieve better variable selection accuracies than two state-of-the-art sparse CCA algorithms. Empirically, we demonstrate through the analysis of DNA methylation and gene expression data that the proposed method selects variables that have as high or higher canonical correlation than the variables selected by sparse CCA methods, which is a rather surprising finding given that objective function of the proposed method does not actually maximize the canonical correlation.     

A Joint Modeling Approach for Longitudinal Outcomes and Non-ignorable Dropout under Population Heterogeneity in Mental Health Studies

The paper proposes a joint mixture model to model non-ignorable drop-out in longitudinal cohort studies of mental health outcomes. The model combines a (non)-linear growth curve model for the time-dependent outcomes and a discrete-time survival model for the drop-out with random effects shared by the two sub-models. The mixture part of the model takes into account population heterogeneity by accounting for latent subgroups of the shared effects that may lead to different patterns for the growth and the drop-out tendency. A simulation study shows that the joint mixture model provides greater precision in estimating the average slope and covariance matrix of random effects. We illustrate its benefits with data from a longitudinal cohort study that characterizes depression symptoms over time yet is hindered by non-trivial participant drop-out.KEYWORDS: Latent growth curve, MNAR drop-out, survival analysis, finite mixture model, mental health     

英文广告语篇的人际意义分析

功能语法中的一个非常重要的组成部分是纯理功能。韩礼德把纯理功能分为三种,即语篇功能,人际功能和概念功能。人际功能指的是人们用语言来和其他人交往,建立和保持人际关系,用语言来影响别人的行为,同时用语言来表达对世界的看法。广告语篇是一种人际功能极强的语篇。在功能语法的框架下对其进行分析,一定会对这种特定的语篇有更深入地理解。