一种A律13折线编码特殊情况的处理方法     

袁妙琴 《四川职业技术学院学报》2011,21(3):121-122

本文基于A律13折线的编码方法,指出了信号抽样值与量化标准电流相等这样一种特殊情况,当出现这种情况时,在实际的量化编码中发端有可能出现两种编码结果.通过对收端解码后两种结果量化误差的讨论,提出了对这种情况的处理方法.  相似文献   

Childhood maltreatment in South Korea: retrospective study     

Lee Y  Kim S 《Child abuse & neglect》2011,35(12):1037-1044

Objective

This study explored the prevalence of childhood maltreatment in South Korea using the retrospective version of ICAST and the associations between perceptions of abuse experienced during childhood and recent interpersonal problems and depression.

Methods

539 young persons, aged 18–24 years, from various universities, work places, and clinical settings participated in a study using the ISPCAN Child Abuse Screening Tool-Retrospective Version (ICAST-R), the short form of the Korean-Inventory of Interpersonal Problems Circumplex Scale (KIIP-SC), and the Korean version of the Beck Depression Inventory (K-BDI).

Results

While males reported more physical abuse, females reported being exposed to more emotional or sexual abuse. The proportion of reported extra-familial or peer abuse was relatively high. Interpersonal problems and depression were significantly high for those who experienced all types of abuse during childhood. Perception of physical abuse as reasonable/justified discipline affected interpersonal problems and perception of emotional abuse when compared to peers affected interpersonal problems and depression. Unlike previous studies, this study identified more depressive symptoms reported with disclosure of sexual abuse.

Practice implications

These findings highlight the importance of understanding how one perceives maltreatment. Perceiving an abusive act as a justifiable disciplinary method may affect reporting as well as longer term consequences for the victim. A wide range of perpetrators and different settings in which maltreatment may occur must be considered as influencing these perceptions. This study contributed to the determination of validity of the ICAST-R for use in wider population surveys.  相似文献   

The role of social trust in reducing long-term truancy and forming human capital in Japan     

Eiji Yamamura 《Economics of Education Review》2011,30(2):380-389

This paper attempts to examine how social trust influences human capital formation using prefectural level data in Japan. To this end, I constructed a proxy for social trust, based on the Japanese General Social Surveys. After controlling for socioeconomic factors, I found that social trust plays an important role in reducing the rate of long-term truancy in primary and junior high school. Results suggest that social trust improves educational quality.  相似文献   

Does parental employment affect children's educational attainment?     

Hannah Schildberg-Hoerisch 《Economics of Education Review》2011,30(6):1456-1467

This paper analyzes whether there exists a causal relationship between parental employment and children's educational attainment. We address potential endogeneity problems due to (i) selection of parents in the labor market by estimating a model on sibling differences and (ii) reverse causality by focusing on parents’ employment when children are aged 0–3. We use data from the German Socioeconomic Panel that provide information on household income, parental employment, and time spent with child care. Our approach disentangles income and time effects of parental employment. Overall, we find little support that parental employment affects children's educational attainment. Controlling for household income, we can rule out that having a mother who works one hour more per week lowers the probability of high secondary track attendance by more than 0.1%.  相似文献   

Trust and schooling in the United States     

Oguzhan C. Dincer 《Economics of Education Review》2011,30(5):1097-1102

I investigate the effects of trust on human capital measured as average years of schooling in U.S. states using data from the 1980s and the 1990s. I find robust evidence that an increase in trust increases schooling across U.S. states. According the results of the seemingly unrelated regression estimation, a 25 percentage point increase in Trust increases the average years of schooling by approximately 1.5 months. This is not insignificant since more than $5000 increase in per capita income (in 2000 prices) is needed to have the same effect on schooling.  相似文献   

河北省第13届运动会足球比赛各队进球情况的分析研究     

宋洪涛 《保定师专学报》2011,(3):107-110

对2010年河北省第13届运动会男子足球（甲组）比赛6支队伍15场比赛67个进球情况进行统计分析,结果表明比赛最后15分钟进球最多,进球方式是以利用中、前场抢断或对方失误,通过中路配合或边路传中为主要进攻形式,多数进球是由4次以下传球完成的,在罚球区内抢点直接脚射是主要的进球方式.  相似文献   

细胞穿膜肽S4(13)与质膜相互作用的分子动力学模拟     

高金爱  崔巍 《中国科学院大学学报》2021,38(6):758-771

细胞穿膜肽S4（13）衍生物可以作为药物载体携带核酸分子进入细胞从而发挥治疗作用,在抗肿瘤靶向治疗等领域有潜在的应用价值,但其穿膜机理目前尚不明确。采用分子模拟方法,分别搭建单个及多个S4（13）在不同的质膜和水溶液中的模型,结合常规分子动力学模拟和增强采样模拟,通过轨迹分析探究单个及多个S4（13）与不同质膜的作用方式。研究结果表明：单个S4（13）分子与细菌质膜的相互作用比与真核生物质膜的更强,而在水溶液和真核生物质膜模型中,多个S4（13）分子则倾向于聚集形成四聚体,表明其穿膜机理与四聚体胶束结构有关。本项工作从分子层面上探讨了细胞穿膜肽S4（13）的穿膜机理,为S4（13）衍生物作为药物载体的应用提供了理论依据。  相似文献   

Publicly funded business advisory services and entrepreneurial outcomes     

Douglas J. Cumming  Eileen Fischer 《Research Policy》2012,41(2):467-481

Given the mixed evidence for the impact of various publicly funded initiatives that aim to foster entrepreneurial activity, this paper empirically examines the efficacy of publicly funded business advisory services in relation to entrepreneurial outcomes. Based on a sample of 228 early-stage firms, of which 101 used business advisory services focused on helping companies secure 1st rounds of financing and start generating revenues, we examine the firm-level impact such services can have on sales growth, innovation, finance and alliances. We find services are positively associated with firms’ sales growth, patents, finance and alliances. We assess statistical and economic significance, and assess robustness to controls for the non-randomness of the firm's using business advisory service program, as well as endogeneity of advisors’ hours spent with firms. Other robustness checks are also included. We find significant robustness of hours spent on sales and finance, but sensitivity of the effect of hours on patents and alliances after controlling for endogeneity.  相似文献   

The impact of short-term economic fluctuations on kindergarten enrollment     

Douglas A. Herman 《Economics of Education Review》2010

For some 5-year-olds, delayed kindergarten enrollment may result in long-term academic benefits. Although waiting an additional year allows for further development prior to the start of formal education, the economic costs of the next best alternatives can be significant. This study examines the impact of short-term economic fluctuations on a household's kindergarten enrollment decision. I find that during economic downturns kindergarten enrollment increases. To explore a potential mechanism through which this effect may arise, I propose an instrumental variables approach to identify the causal effect of fluctuations in household resources due to the business cycle on the timing of kindergarten enrollment.  相似文献   

Does school choice increase the rate of youth entrepreneurship?     

Russell S. Sobel  Kerry A. King 《Economics of Education Review》2008

Because entrepreneurial activity is a key source of economic growth, promoting youth entrepreneurship has become a priority for policymakers. School choice programs force administrators and teachers to be more entrepreneurial in their jobs by encouraging innovation and by creating competition and a more business-like environment in K-12 education. Does going to school in this climate make students more likely to become entrepreneurs? In this paper we test whether youth entrepreneurship rates are higher in counties with school choice programs. We find that voucher programs create higher rates of youth entrepreneurship, while charter schools do not, relative to traditional public schools.  相似文献