韩国语语流中送气音与紧音的音变现象探析

学术界对韩国语语流中音节之间的送气音与紧音的变音现象似乎还没有足够的重视,研究不够深入,有待于进一步探究。韩国语语流中音节之间的送气音与紧音的音变现象,主要表现在以下两个方面:一是以元音结尾的音节因为受后面送气音或紧音为首发音音节的影响,自然而然地添加韵尾;二是后面的元音音节因为受前音节的送气音或紧音韵尾的影响而产生连音变音现象。音节之间的送气音与紧音犹如连接两个或两个以上音节的桥梁,使发音音节形成比较稳定的发音单位。如果把音节之间的送气音长度分为三等分,那么在前音节韵尾发音长度为一等分,在后音节的首发音发音长度为二等分;如果把音节之间的紧音长度分成二等分,那么前音节的韵尾发音长度和后音节首发音发音长度各为一等分。当然,声音的长短轻重因人而异,但这种分析方法基本上符合现实生活中一般韩国人的发音习惯,具有一定的科学性和实用性。     

小儿先天性心脏病的探查分析

目的:通过彩超对先天性心脏病进行探查、分类,明确诊断,早期治疗。方法:采用美国惠普公司生产的HP7500彩色多普勒超声心动仪与美国GE公司生产的GE vivid7型彩色多普勒超声心动仪,对2008-2010年临床疑诊为先天性心脏病的患儿256例进行检查,检出先天性心脏病患儿210例。结果:检出室间隔缺损83例,占39.5%,室间隔膜部瘤并室缺15例,并房间隔缺损20例。②房间隔缺损55例,占26.1%,③动脉导管未闭38例,占18.9%,④法四15例,占0.07%;⑤心内膜垫缺损9例,占0.04%;⑥永存动脉干3例,占0.014%;⑦三尖瓣闭锁2例,占0.01%;⑧右室双出口2例,占0.01%;⑨原发性肺动脉高压2例,占0.005%;⑩右位心,肺静脉异位引流1例,占0.005%。结论:彩超诊断小儿先天性心脏病准确并且无创,对手术方式的选择和术后评价提供了有价值的临床资料。     

关于“三百千”的用字问题

《三字经》、《百家姓》和《千字文》作为我国古代最著名的一套蒙学教材,具有十分重要的研究价值。本文在系统总结前贤研究成果的基础上,首次采用计算机数据库技术对"三百千"的实际用字进行了科学统计,然后将之与现代一系列的规范字表与字典进行对比分析,确定了"三百千"用字的基本流向,最后进一步探求了"古今汉语通用基本字"的面貌。     

Efficient flow control of jobs in assembly lines

This paper addresses the issues of efficient flow control techniques for jobs in assembly lines. We propose a queuing theoretic approach for efficient flow control of jobs. An assembly line performance measure (ALPM) is used as the measure of performance for each assembly line and is denned as the ratio of throughput to total average delay of an assembly line (AL). A performance product criterion (PPC) is used as the performance measure of a cluster of ALs. It is shown that the performance product criterion has a unique maximum in throughput space. Two algorithms are presented to find the maximum of the performance product criterion in two different cases of assembly line environment. In the first algorithm, we attempt to maximize the performance product criterion with respect to the throughputs of the assembly lines in the entire throughput space. The second algorithm maximizes the performance product criterion when the sum of the throughputs of the ALs is fixed. Numerical examples are given as illustrations of the algorithms.     

城镇就业风险、环境、条件与外出务工农村劳动力的逆向回流

基于685份外出务工农村劳动力样本的问卷调查数据，建立有序Logistic回归模型，分析外出务工农村劳动力个人及家庭特征、就业能力、就业风险、就业环境及就业条件等对其逆向回流行为的影响。结果显示：外出务工农村劳动力年龄越大，身体素质和文化水平越低，务工单位拖欠工资与签订合同情况越差，城镇政策体制环境、经济环境和文化环境越差，理想工作的择业门槛越高，外出务工劳动力越倾向于彻底逆向回流。因此，为实现农村剩余劳动力的彻底转移，应积极发展城镇第二、第三产业，改善城镇就业环境，降低农村劳动力在城镇务工的就业风险，同时有效提高农村劳动力的健康水平和文化素质。     

基于现金流量的企业财务预警实证研究——来自我国房地产业上市公司数据

财务危机是威胁企业持续经营的根本性危机,财务预警作为经济运行的晴雨表和企业经营的警示灯,在全球金融危机后其重要性更加凸显。现金是企业的血液,现金流量信息作为企业实体资源和财务状况最直接的反映,对企业财务危机具有较强的财务判别和预警能力。本文以现金流量指标对房地产企业进行实证研究,建立房地产业的现金流财务预警模型并检验其预测财务危机能力,为房地产企业提供可操作的规避财务风险的思路。     

The Game of Contacts: Estimating the Social Visibility of Groups

Estimating the sizes of hard-to-count populations is a challenging and important problem that occurs frequently in social science, public health, and public policy. This problem is particularly pressing in HIV/AIDS research because estimates of the sizes of the most at-risk populations-illicit drug users, men who have sex with men, and sex workers-are needed for designing, evaluating, and funding programs to curb the spread of the disease. A promising new approach in this area is the network scale-up method, which uses information about the personal networks of respondents to make population size estimates. However, if the target population has low social visibility, as is likely to be the case in HIV/AIDS research, scale-up estimates will be too low. In this paper we develop a game-like activity that we call the game of contacts in order to estimate the social visibility of groups, and report results from a study of heavy drug users in Curitiba, Brazil (n = 294). The game produced estimates of social visibility that were consistent with qualitative expectations but of surprising magnitude. Further, a number of checks suggest that the data are high-quality. While motivated by the specific problem of population size estimation, our method could be used by researchers more broadly and adds to long-standing efforts to combine the richness of social network analysis with the power and scale of sample surveys.     

两区复合油藏二次梯度非线性渗流模型研究

考虑二次压力梯度影响的非线性渗流模型比常规线性模型更能准确反映地下原油在油藏中的渗流规律。针对两区复合油藏，从达西定律、质量守恒原理出发，结合状态方程，推导出了考虑二次压力梯度影响的渗流方程，建立了二次压力梯度两区复合油藏非线性渗流试井模型。通过变量代换，将渗流方程线性化，求得Laplace空间解析解，利用数值反演获得实空间解，从而绘制出带二次压力梯度影响的两区复合油藏试井样版曲线，对不同参数进行了敏感性分析。误差分析表明二次压力梯度影响不应被忽略。     

用淬冷法确定饱和液氮中的池沸腾热流密度曲线

用直径为５０ｍｍ、厚度为１２ｍｍ的铜平板在液氮中进行了不同热面方位角的淬冷沸腾实验，各方位角为θ＝０°（热面向下）、１０°、２０°、３０°、５０°和９０°（热面垂直）；随着方位角的增加，临界热流密度、最小膜态沸腾热流密度及其壁面过热度相应地增加，且在方位角θ＜３０°时，θ对上述参数的影响更大；得出ｑＣＨＦ、ｑｍｉｎ与方位角的关系式．     

旋转三维紊流流场的数值分析

应用SIMPLEST方法和标准k-ε紊流模型对旋转直通道内的流场进行计算，给出了该旋转流场的速度矢量图及压力场，并将测量截面上的主流和二次流速度分布与实验值作了对比，结果吻合较好，对叶轮机械内的旋转流场的数值模拟有重要意义。