Remote effects of lower limb stretching: preliminary evidence for myofascial connectivity?

The skeletal muscles and the fibrous connective tissue form an extensive, body-wide network of myofascial chains. As fascia can modify its stiffness, strain transmission along these meridians is supposable. The goal of this trial therefore was to collect pilot data for potential remote effects of lower limb stretching on cervical range of motion (ROM). Twenty-six healthy participants (30 ± 6 years) were included in the matched-pairs intervention study. One group (n = 13) performed three 30 s bouts of static stretching for the gastrocnemius and the hamstrings, respectively. An age- and sex-matched control group (CG; n = 13) remained inactive. Pre- and post-intervention, maximal cervical ROM in flexion/extension was assessed. A repeated measures ANOVA revealed systematic differences between groups (P < .05). ROM increased following stretching (143.3 ± 13.9 to 148.2 ± 14°; P < .05) but remained unchanged in the CG (144.6 ± 16.8 to 143.3 ± 16.8°; P > .05). Our data point towards existence of a strain transfer along myofascial meridians. Further randomised controlled studies on conditions, factors and magnitude of tensile transmission are warranted.     

基于马尔可夫模型的高校图书馆学科评价服务研究

随着"双一流"建设总体方案的提出，科研成果越来越受到重视，高校图书馆开展学科评价服务，对于提升图书馆的服务和地位具有至关重要的意义。本文在分析了吉林大学2010-2016年发表的论文总体情况的基础上，选取论文发表总量前10名的学科为研究对象，运用文献计量学方法和马尔可夫模型分析方法，与传统的评价指标相结合，构建相应的综合评价指标，消除学科间的基础差异，分析得出各个学科的发展速度和发展趋势情况。     

Using lexical chains for keyword extraction

Keywords can be considered as condensed versions of documents and short forms of their summaries. In this paper, the problem of automatic extraction of keywords from documents is treated as a supervised learning task. A lexical chain holds a set of semantically related words of a text and it can be said that a lexical chain represents the semantic content of a portion of the text. Although lexical chains have been extensively used in text summarization, their usage for keyword extraction problem has not been fully investigated. In this paper, a keyword extraction technique that uses lexical chains is described, and encouraging results are obtained.     

关于我国农村批零业态实现连锁经营的思考

在我国农村批零业态发展连锁经营可产生低价格优势,提高其经营管理水平和竞争优势.在农村零售业态发展连锁店的主要途径:1.城市大中型零售业态或有实力的连锁企业向农村发展连锁店;2.充分利用供销社已有的系统和网络优势开办连锁店.农村批发业态发展连锁经营的主要途径:1.大型商业批发商和零售业批发以连锁经营形式向农村扩展;2.商业批发市场向农村发展连锁市场.     

诺贝尔科学奖跨学科师承效应定量研究

交叉学科往往是学科新的生长点,有可能产生新的科学突破,为科学带来革命性的发展。交叉科学的发展离不开大量跨学科的人才,而高水平跨学科人才的培养始于交叉学科的研究生教育。文章选取1901-2013年诺贝尔科学奖获奖者为研究对象,以是否师从诺贝尔奖得主为分组变量,从物理、化学和生理或医学三大学科内和跨学科角度对比分析师承效应的影响,凸显跨学科师承效应的作用。研究结果表明,与单纯的学科内师承效应相比,考虑跨学科师生关系的师承效应可更显著地促进未来诺贝尔科学奖获奖者的成长和成才。     

Entrepreneurial opportunity and related specialization in economic ecosystems

Entrepreneurial ecosystems are most often defined as locally bounded networks of institutions and individuals that help entrepreneurs to identify and exploit market opportunities. However, a prerequisite of the ability to exploit an entrepreneurial opportunity is the existence of the opportunity to begin with. In this paper, we propose an approach to representing how entrepreneurial opportunities are embedded in a regional economy. The central methodological contribution of our paper is to introduce the concept of related specialization, which we define as the concentration of high interdependencies between specialized industries within a metropolitan region, relative to the national level of concentration. We find that related specialization is positively correlated with entrepreneurial outcomes across U.S. metropolitan areas. We use related specialization to make a first attempt at representing the trophic structure of an economic ecosystem. In a biological ecosystem, the trophic structure refers to energy-transfer relationships between different species. As introduced in this paper, we propose the analogy that, in an economic ecosystem, the trophic structure may be mapped in terms of the supply-chain relationships between industries within a region. We argue that these analytic tools can help policymakers more readily understand the opportunities that are imminently available to entrepreneurs in their local environments.     

基于马尔柯夫链的高校教师绩效评价研究

在高校教师考核工作的实践中,由于高等教育的学术性强的突出特点,高校教师的工作评价体系的科学化一直是个有待深入研究的问题。本文基于马尔柯夫链原理,构建高校教师绩效评价模型,并通过算例进行演算。本文认为马尔柯夫链方法能从动态发展的角度较为简便、科学、客观地评价高校教师绩效考核情况。     

供应链环境下RFID标签所有权安全转换协议研究

在基于RFID技术的商业活动中,一项非常重要的任务是保护供应链上各个企业的商业秘密不因RFID标签所有权的转换而带来风险.基于Hash函数和对称密码体制,提出了一种适合于供应链环境的轻量级RFID标签所有权转换协议.协议具有抗重放攻击、抗异步攻击、抗假冒攻击、抗内部攻击等特性,并能确保前向、后向隐私安全性.与现有典型的RFID标签所有权转移协议相比,协议的安全性、隐私性好,效率高,能保护企业的商业秘密,具有很好的现实意义.     

五角链的点PI指标

图G的点PI指标指的是:取遍G中的每一条边,满足到这条边两个端点距离不相等的点的个数.为了得到五角链的点PI指标,把它的边分成三类并分别进行计算,可以得到五角链的点PI指标.利用PIv(G)=mn-∑S(e),给出二部图点PI指标的界:(n-1)n≤PIv(G)≤n.     

供应链管理环境下的连锁超市客户关系管理

近年来连锁超市在我国发展迅速,已遍布各大城市,其竞争日趋激烈,其中供应链客户关系是影响其发展的重要因素。为了进一步完善连锁超市的客户关系管理,对连锁超市的供应链客户关系现状及问题进行了相关分析,并对连锁超市客户关系管理提出了建议。