论毛泽东早期民主教育思想

毛泽东早期民主教育思想是毛泽东教育思想体系中的一个重要组成部分,是理解和把握毛泽东思想体系核心内容的关键之一.为了理解毛泽东早期民主思想的发展脉络,把握毛泽东早期民主教育思想的实质,通过分析毛泽东早期民主教育思想的内涵和特点来阐述毛泽东早期民主教育思想,对于推动当代青少年的素质教育的发展和教育教学方法意义重大.     

企业管理中的末位淘汰制：法律问题与改进途径

末位淘汰制源于西方企业的管理方式,作为一种绩效管理手段,它可谓毁誉参半。虽然它对于激励员工的作用不容否认,但其在实施过程中往往会违背现行的《劳动合同法》的法律规定。如何在现有《劳动和同法》的框架内改革与完善制度自身,使末位淘汰制兼具合理性与合法性,成为大量专业人士一直探讨的问题。通过采用案例实证法进行了研究,探寻了末位淘汰制度与现行法律相衔接的途径,并通过重新进行制度设计,使得末位淘汰制重新获得生存的空间,发挥其在提高组织绩效上的积极作用。     

Impact of product proliferation on the reverse supply chain

Product variety is one of the most important advantages in highly competitive markets. However, excessive product proliferation's reducing the profit margin has caused increased focus on developing a management method for maximal profit. In a closed-loop supply chain, product proliferation affects the reverse supply chain as well as the forward supply chain. Although increasing the number of product types can better satisfy diverse customer needs, complexity in the product recycling, remanufacturing, and resale processes may erode a firm's overall profits. In this study, we develop a mathematical model for analyzing a capacitated reverse supply chain consisting of a single manufacturer and multiple retailers. We reveal closed-form solutions for the optimal batch size and maximal profit, and discuss managerial insights into how the number of products and other factors can affect both batch size and profit. Finally, we investigate the relationship between product proliferation and the choice of logistics strategy.     

A note on optimal pebbling of hypercubes

A pebbling move consists of removing two pebbles from one vertex and then placing one pebble at an adjacent vertex. If a distribution δ of pebbles lets us move at least one pebble to each vertex by applying pebbling moves repeatedly(if necessary), then δ is called a pebbling of G. The optimal pebbling number f′(G) of G is the minimum number of pebbles used in a pebbling of G. In this paper, we improve the known upper bound for the optimal pebbling number of the hypercubes Q _n . Mainly, we prove for large n, $f'(Q_{n})=O(n^{3/2}(\frac {4}{3})^{n})$ by a probabilistic argument.     

Some results on the target set selection problem

In this paper we consider a fundamental problem in the area of viral marketing, called Target Set Selection problem. We study the problem when the underlying graph is a block-cactus graph, a chordal graph or a Hamming graph. We show that if G is a block-cactus graph, then the Target Set Selection problem can be solved in linear time, which generalizes Chen’s result (Discrete Math. 23:1400–1415, 2009) for trees, and the time complexity is much better than the algorithm in Ben-Zwi et al. (Discrete Optim., 2010) (for bounded treewidth graphs) when restricted to block-cactus graphs. We show that if the underlying graph G is a chordal graph with thresholds θ(v)≤2 for each vertex v in G, then the problem can be solved in linear time. For a Hamming graph G having thresholds θ(v)=2 for each vertex v of G, we precisely determine an optimal target set S for (G,θ). These results partially answer an open problem raised by Dreyer and Roberts (Discrete Appl. Math. 157:1615–1627, 2009).     

"我晒故我在":移动传播时代的青年游客凝视与自我建构

随着视觉技术的发展,旅行摄影成为了游客凝视自然或人文风景区的有形化与具体化实践.通过对20位青年旅行者的深度访谈,发现游客通过将风景转化成照片,使旅游的瞬时体验成为了永恒的收藏,而社交媒体的发展导致了游客凝视的进一步转向.一方面,受访者希望将旅行中的个人体验在社交媒体上分享以形塑关系自我、改善人际关系,并通过良好的线上互动行为进一步激发创作与分享的热情;另一方面,受访者会因为群体压力,通过设置分组等方式来隐藏旅游中的"集体自我".     

新时代弘扬三峡移民精神的价值意蕴和实践路径

三峡移民精神深刻体现了民族精神和时代精神,是中国共产党在领导推进"世纪工程"三峡大坝建设的历史实践中所形成的精神瑰宝,其融汇了顾全大局的爱国精神、舍己为公的奉献精神、万众一心的协作精神、艰苦创业的拼搏精神,是推进中华民族复兴伟业的精神力量.新时代,需要进一步永葆党员本色,赓续共产党人精神血脉;发挥人民作用,建构支撑性弘扬主体;丰富传承形式,形成立体式弘扬格局;依托优质资源,创新多样化传承载体;从而有效推动三峡移民精神在新时代发扬光大.     

基于高斯谱聚类的风险商户聚类分析

随着电子支付的普及,市场涌现出越来越多的第三方支付平台,而当前关于第三方支付平台商户风险方面的研究相对较少。故本文提出基于高斯谱聚类的风险商户聚类方法,首先使用高斯混合模型构建交易-交易群体的双模网络;其次借助网络中信息传递的思想构建“商户-交易群体网络”的双模网络;再次使用双模网络聚类方法中的谱聚类方法同时对网络中的两类节点聚类,对商户节点聚类的结果可区分出不同风险级别的商户,对交易群体节点聚类的结果可以进一步描述风险商户的交易特征;最后本文分别在模拟数据和某第方支付平台的实际数据中验证了模型的有效性。实验结果表明,本文提出的方法不仅可以准确地区分出不同风险级别的商户群体,而且能总结归纳风险商户的交易特征,为风险商户的监管提供参考。     

二语习得过程的认知语言学诠释

二语习得研究由3个重要部分构成,即语言输入与输出研究,习得者内部与外部因素研究和中介语系统研究,这3个部分都与认知语言学有着密切的联系。语言能力是人类认知能力不可分割的一部分,语言习得过程是一种心理和智力过程。在认知语言学领域,二语习得研究被看作认知科学的一个分支,语言习得成为人的基本认知能力的组成部分。作为认知能力的一部分,语言学习从一开始就受到认知的合理性制约。从认知语言学的角度研究二语习得,对于二语习得本身和大学英语教学具有重要的指导意义。     

液固顶空气相色谱法测定双氢青蒿素中有机溶剂残留

建立了液固顶空气相色谱法测定双氢青蒿素中有机溶剂残留量。采用DB-5大口径毛细管柱,以正丙醇为内标进行定量。甲醇、乙醇的线性范围分别为3.2～317.0μg·mL-1(r=0.9996),3.5～348.0μg·mL-1(r=0.9995);回收率分别为104.8%,101.1%;最低检测限分别为0.08μg·g-1,0.18μg·g-1。本方法简单、准确、灵敏度及重现性好。