我国农业类上市公司风险管理有效性检验

企业进行风险管理是否起到了应有的作用,一直是理论界关心的话题。运用我国农业类上市公司2006~2010年的年报数据,对风险管理有效性的问题进行了实证检验。研究发现,企业运用金融衍生品进行风险对冲,对公司价值具有一定的正面影响,而通过设立风险管理机构进行风险管理也能提升公司价值,但显著性方面有所不及;除此之外,还根据我国上市公司经营管理的实际,以公司诉讼仲裁与受谴责事件的数量作为风险管理的措施进行了研究,结果发现,企业年度诉讼仲裁事件的数量与公司价值存在明显的负相关关系。总体来看,农业类上市公司进行风险管理的有效性较为显著,这也意味着我国的上市公司应该加强全面风险管理体系的建设。     

论文学话语对当代中国对外国家形象的构建

政治话语与文学话语具有密切关系.文学话语在当前构建中国国家形象中具有独特优势:可以将国家理性形象转换为直观感性形象;整体形象转换为具体细节形象;将固定形象转换为想象延伸形象.为此,必须利用文学话语积极应对国外文化霸权主义的挑战;必须复活中国历史上展示国家形象的文学资源;要将政府官方输出与民间文学渗透相融合.     

工读学生的人格与自我同一性状态:社会支持的中介效应分析

目的：探索工读学生自我同一性状态的特点;探索工读学生人格、社会支持和自我同一性状态的关系。方法：采用青少年自我同一性状态问卷、社会支持评定量表和大五人格量表,对长株潭地区的工读学校279名学生和普通学校361名学生进行了调查,并采用SPSS16.0和Amos7.0软件对调查数据进行统计分析。结果：工读学生的主观支持、支持利用度与大五人格的外倾性、宜人性、责任感、神经质显著相关,与自我同一性扩散状态、获得状态显著相关。结论：工读学生的扩散状态显著高于普通学生,延缓状态显著低于普通学生;社会支持在工读学生的人格与自我同一性扩散状态、延迟状态中起部分中介作用。     

我国企业集群技术创新战略研究

集群经济特别是企业集群已经成为当今世界经济的一个重要特点,这不仅表现在它对企业竞争优势塑造所起到的日益重要的作用,而且在根本上改变了某一具体企业在产业内、产业间的生存环境和运营状态。本文以现有已经发展相对成熟的相关理论为基础,结合国内外相关研究成果,分析了我国企业集群技术创新的现状,并对现有理论进行了一定程度的补充。     

产能不确定供应商的风险厌恶行为对供应链的影响

针对具有产能不确定性的风险厌恶供应商和风险中性零售商组成的供应链系统,本文采用经典的风险指标Value-at-risk(VaR)衡量供应商的风险厌恶程度,并将其作为供应商的优化约束条件之一。在斯坦伯格顺序博弈的模型框架下,零售商做定价和订货量决策,供应商做批发价决策。本文求得供应商批发价在VaR约束下的理论上下界,研究了风险厌恶程度对最优批发价的影响。与风险中性环境下的结果相比,在设立合理目标利润的前提下,高风险厌恶程度可能使得供应商提高批发价,低风险厌恶程度则对供应商批发价无影响。当目标利润设立很高时,供应商为了逐利将会降低批发价诱导零售商提高订货量。     

"十四五"时期临港新片区发展离岸业务若干建议

随着我国新一轮高水平开放不断加速,加快发展离岸贸易和离岸金融业务的需求越来越迫切.上海作为国际金融和贸易中心,要充分发挥自身优势,把离岸业务作为重要突破口和发力点,持续推进临港新片区全方位、深层次开放,深入落实"五个重要",打造投资经营便利、货物自由进出、资金流动便利、运输高度开放、人员自由执业、信息快捷联通的特殊经济功能区.     

The Evolving Diaspora of Talent: A Perspective on Trends and Implications for Sourcing Science and Engineering Work

This perspective paper highlights the changing dynamics underlying the supply and demand for STEM (Science, Technology, Engineering, and Mathematics) talent. As a global ecosystem of innovation emerges, the emerging diaspora of STEM talent networks is potentially a game changing phenomenon affecting where, by whom and how innovation activities are executed. We discuss several emerging trends, such as global sourcing, open sourcing, new on-line STEM talent markets and the shift of organizations becoming mobile workplaces, that have the potential to reshape and define the diaspora of STEM talent network, as well as the organization and conduct of the globalization of innovation. We propose future research agenda by drawing implications on the impact of the diaspora of STEM networks at the country level, company level, as well as individual level.     

An Empirical Study of the Relations Between Hospital Volume,Teaching Status,and Service Quality

This paper contributes to research on quality drivers in healthcare settings by examining the relationships between patient volume, teaching mission, and process quality in US hospitals. To develop a model that accurately assesses the impact of patient volume and teaching status on quality, we draw on three related research streams pertaining to the volume–quality relationship, the comparative quality of care in teaching and non‐teaching hospitals, and quality drivers in service institutions. We propose the impact of patient volume on process quality varies across hospitals with different teaching intensities. The test of this proposition uses a large data set that measures process quality for treatments for heart attacks and heart failures in all major US hospitals. Our results suggest that, as hospital teaching intensity increases, greater patient volume is associated with decreased process quality. Never before was such a relationship uncovered. This initial finding has important practical implications. First, the regionalization policy of hospitals should be re‐evaluated in light of their teaching function. Second, the root causes for the lower quality scores of large, high resident‐to‐bed ratio teaching hospitals, compared with smaller versions, must be found.     

Exact and approximation algorithms for?the?complementary maximal strip recovery problem

Given two genomic maps G ₁ and G ₂ each represented as a sequence of n gene markers, the maximal strip recovery (MSR) problem is to retain the maximum number of markers in both G ₁ and G ₂ such that the resultant subsequences, denoted as $G_{1}^{*}$ and $G_{2}^{*}$ , can be partitioned into the same set of maximal substrings of length greater than or equal to two. Such substrings can occur in the reversal and negated form. The complementary maximal strip recovery (CMSR) problem is to delete the minimum number of markers from both G ₁ and G ₂ for the same purpose, with its optimization goal exactly complementary to maximizing the total number of gene markers retained in the final maximal substrings. Both MSR and CMSR have been shown NP-hard and APX-hard. A?4-approximation algorithm is known for the MSR problem, but no constant ratio approximation algorithm for CMSR. In this paper, we present an O(3 ^k n ²)-time fixed-parameter tractable (FPT) algorithm, where k is the size of the optimal solution, and a 3-approximation algorithm for the CMSR problem.