残疾儿童社会保障制度的研究

目前,政府通过发展社会保障以增进社会和谐的政策方向基本确立,倡导残疾儿童社会保障制度的适度公正机制是基于经济发展和现代社会平等两者之间的权衡。目的是使社会成员都能够普遍以适度标准不断享受经济社会发展的成果,从而有效地实现社会整合。我国已经初步具备实现残疾儿童社会保障制度的适度公正目标的条件,基于此目标,残疾儿童的社会保障制度仍存在以下制约瓶颈：相关社会保障制度建设法规滞后;政府保障主体地位缺失,财政经费投入不足;残疾儿童参与社会保障层次低、覆盖面窄;保障政策执行部门行政多头管理。因此,残疾儿童社会保障制度的制度设计需要着重于：保持经济发展水平下残疾儿童保障支付享受标准;倡导公正和能动的残疾儿童权利保障价值取向：界定政府责任边界和立法,广泛动员社会力量;整合政府部门残疾儿童社会保障资源。     

Who Is Supporting Homeless Youth? Predictors of Support in Personal Networks

Homeless youth lack the traditional support networks of their housed peers, which increases their risk for poor health outcomes. Using a multilevel dyadic analytic approach, this study identified characteristics of social contacts, relationships, and social networks associated with the provision of tangible and emotional support to homeless youth (N = 419, M age = 20.09, SD = 2.80). Support providers were likely to be family members, sex partners, or non–street‐based contacts. The provision of support was also associated with contacts' employment and homelessness status, frequency of contact, shared risk behaviors, and the number of network members that were homeless and employed. The results provide insights into how homeless youth could be assisted to develop more supportive social networks.     

中古汉地之西域文化

社会文化生成与历史生成相互促生.文化生成主要在于文化接触、交往交融而形成复合文化.社会生成,主要指不同形态社会力量(生产方式、主体等)碰撞交流,形成新的社会特质.历史生成,因历史过程、历史事件尤其朝代更替或政权变更,使主体及其文化迁移或滞留,而产生新的社会主体或结构.即历史生成实质涵括或促动社会文化生成.同时,社会与文化生成积淀或敦促历史生成.族属、信仰之转换、转向通常基于文化、社会和历史的生成.即历史生成往往基于社会文化生成.自古代经中世纪至近代,西域文化不断东渐中土,与南北方汉文化交融生成,逐步成为现今汉文化的重要构成.此亦历史生成之内容.     

Stressors beget stressors: The effect of passive leadership on employee health through workload and work–family conflict

The current study examined passive leadership as a potential antecedent of two commonly studied workplace stressors (i.e. workload and work–family conflict), and investigated its negative effect on employee burnout and physical symptoms via these stressors. We collected two waves of data from 274 focal participants, and one wave of data from their co-workers. Results showed that both self-reported and co-worker-reported passive leadership was positively related to employee burnout and physical symptoms, as well as workload and work–family conflict. Additionally, workload and work–family conflict partially mediated the effects of passive leadership on burnout and physical symptoms, respectively. Our findings support the notion that passive leadership can create a stressful workplace and have a detrimental effect on employees’ health.     

A heuristic for the time constrained asymmetric linear sum assignment problem

The linear sum assignment problem is a fundamental combinatorial optimisation problem and can be broadly defined as: given an \(n \times m, m \ge n\) benefit matrix \(B = (b_{ij})\), matching each row to a different column so that the sum of entries at the row-column intersections is maximised. This paper describes the application of a new fast heuristic algorithm, Asymmetric Greedy Search, to the asymmetric version (\(n \ne m\)) of the linear sum assignment problem. Extensive computational experiments, using a range of model graphs demonstrate the effectiveness of the algorithm. The heuristic was also incorporated within an algorithm for the non-sequential protein structure matching problem where non-sequential alignment between two proteins, normally of different numbers of amino acids, needs to be maximised.     

Total completion time minimization in online hierarchical scheduling of unit-size jobs

This paper investigates an online hierarchical scheduling problem on m parallel identical machines. Our goal is to minimize the total completion time of all jobs. Each job has a unit processing time and a hierarchy. The job with a lower hierarchy can only be processed on the first machine and the job with a higher hierarchy can be processed on any one of m machines. We first show that the lower bound of this problem is at least \(1+\min \{\frac{1}{m}, \max \{\frac{2}{\lceil x\rceil +\frac{x}{\lceil x\rceil }+3}, \frac{2}{\lfloor x\rfloor +\frac{x}{\lfloor x\rfloor }+3}\}\), where \(x=\sqrt{2m+4}\). We then present a greedy algorithm with tight competitive ratio of \(1+\frac{2(m-1)}{m(\sqrt{4m-3}+1)}\). The competitive ratio is obtained in a way of analyzing the structure of the instance in the worst case, which is different from the most common method of competitive analysis. In particular, when \(m=2\), we propose an optimal online algorithm with competitive ratio of \(16\) \(/\) \(13\), which complements the previous result which provided an asymptotically optimal algorithm with competitive ratio of 1.1573 for the case where the number of jobs n is infinite, i.e., \(n\rightarrow \infty \).     

改进粒子群算法优化灰色神经网络预测模型及其应用

文章针对神经网络存在局部最优、收敛速度慢以及大样本等缺点,将改进的粒子群算法、灰色模型和神经网络模型有机结合,构建了改进粒子群优化灰色神经网络预测模型(IPSO-GMNN).并与其他预测模型进行比较,实证结果表明:IPSO-GMNN预测模型能够克服神经网络预测模型的不足,更好地识别时间序列的非线性和突变性特征.在对我国专利授权数量的预测应用中,新模型对非线性时间数据预测表现出更好的预测精度和稳定性.     

大数据背景下线上商品价格变动对CPI的影响

文章利用2011年2月至2015年9月阿里巴巴研究院公布的网络零售价格(ASPI)指数及其各分类商品价格指数与国家统计局公布的CPI历史数据分别作为线上、线下一般商品价格变动的代理变量,在协整检验的基础上采用向量误差修正模型对线上、线下商品价格变动的关联关系进行了定量分析,并对构成ASPI的各分项商品价格指数与CPI之间的关系进行了分析.研究表明:在误差修正机制的作用下,线上、线下商品价格之间存在稳定均衡的关系.     

Robust inference for group sequential trials

For ethical reasons, group sequential trials were introduced to allow trials to stop early in the event of extreme results. Endpoints in such trials are usually mortality or irreversible morbidity. For a given endpoint, the norm is to use a single test statistic and to use that same statistic for each analysis. This approach is risky because the test statistic has to be specified before the study is unblinded, and there is loss in power if the assumptions that ensure optimality for each analysis are not met. To minimize the risk of moderate to substantial loss in power due to a suboptimal choice of a statistic, a robust method was developed for nonsequential trials. The concept is analogous to diversification of financial investments to minimize risk. The method is based on combining P values from multiple test statistics for formal inference while controlling the type I error rate at its designated value.This article evaluates the performance of 2 P value combining methods for group sequential trials. The emphasis is on time to event trials although results from less complex trials are also included. The gain or loss in power with the combination method relative to a single statistic is asymmetric in its favor. Depending on the power of each individual test, the combination method can give more power than any single test or give power that is closer to the test with the most power. The versatility of the method is that it can combine P values from different test statistics for analysis at different times. The robustness of results suggests that inference from group sequential trials can be strengthened with the use of combined tests.     

国际社会打击索马里海盗的法律分析

为维护国际海运安全,国际社会纷纷派出军舰赴索马里海域参加打击海盗的行动。这一行动的国际法依据是联合国安理会的授权、海洋法公约的相关规定和索马里过渡政府的同意,且三个因素相互关联。同时打击海盗的行动应受到相关国际法的约束,包括履行尊重沿岸国主权的义务、遵守人道主义法则的义务和因国际不法行为造成损失的赔偿责任。