Decision mode,information and network attachment in the internationalization of SMEs: A configurational and contingency analysis

There has been limited attention to the internationalization of SMEs as a decision, and how the use of contrasting decision modes is associated with different information use and patterns of network attachment. This paper offers a new and systematic analysis of the likely associations between decision modes, information use, and network attachment among internationalizing SMEs. The analysis is subsequently contextualized in terms of two contingencies – the knowledge domain of the SME and the international experience of its key decision-maker. By focusing on the relation between a relatively neglected subject – decision modes – and other issues that have been more center-field, the paper contributes to an analytic synthesis in the field of SME internationalization research.     

GPSAR的一种特征子空间滤波干扰抑制方法

详细分析了轨道地表穿透合成孔径雷达(Rail-GPSAR)所受到的各种干扰的特性,发现特征子空间滤波法能够有效地同时滤除射频干扰(RFI)和耦合杂波.实验结果表明,抑制干扰的效果明显,达到了预期的目的.     

基于OQAM-OFDM的NOMA通信系统设计

针对传统基于正交频分复用（OFDM）调制波形的非正交多址接入（NOMA）通信系统存在的旁瓣衰减较慢问题,提出了一种基于交错正交幅度调制的正交频分复用（OQAM-OFDM）波形的NOMA系统设计方案。所提设计方法通过在典型NOMA系统设计中加入OQAM预调制和滤波器组滤波等处理,有效加快旁瓣衰减,实现了较好的频域聚焦性能。仿真结果表明,提出的设计方法不仅有效提高了系统的频谱利用率,而且在抵抗多径干扰时误码率有所降低。虽然重点研究了通信下行链路,但是所得结论同样适用于上行链路。     

Minimax‐Optimal Strength of Statistical Evidence for a Composite Alternative Hypothesis

While the likelihood ratio measures statistical support for an alternative hypothesis about a single parameter value, it is undefined for an alternative hypothesis that is composite in the sense that it corresponds to multiple parameter values. Regarding the parameter of interest as a random variable enables measuring support for a composite alternative hypothesis without requiring the elicitation or estimation of a prior distribution, as described below. In this setting, in which parameter randomness represents variability rather than uncertainty, the ideal measure of the support for one hypothesis over another is the difference in the posterior and prior log‐odds. That ideal support may be replaced by any measure of support that, on a per‐observation basis, is asymptotically unbiased as a predictor of the ideal support. Such measures of support are easily interpreted and, if desired, can be combined with any specified or estimated prior probability of the null hypothesis. Two qualifying measures of support are minimax‐optimal. An application to proteomics data indicates that a modification of optimal support computed from data for a single protein can closely approximate the estimated difference in posterior and prior odds that would be available with the data for 20 proteins.     

Public and expert collaborative evaluation model and algorithm for enterprise knowledge

Knowledge is becoming the most important resource for more and more enterprises and increases exponentially, but there is not an effective method to evaluate them cogently. Based on Web2.0, this article firstly builds an enterprise knowledge sharing model. Synthetically taking the advantage of the convenience and low cost in public evaluation and of the specialty in peer review, a public and expert collaborative evaluation (PECE) model and algorithm for enterprise knowledge are put forward. Through analyzing interaction between user's domain weights and scores of knowledge points, the PECE model and algorithm serve to recognise valuable knowledge and domain experts efficiently and therefore improve ordering and utilisation of knowledge. This article also studies malicious and casual evaluation from users and a method is proposed to update user's domain weights. Finally, a case of knowledge sharing system for amanufacturing enterprise is developed and realised. User's behaviour of publishing and evaluating knowledge is simulated and then analysed to verify the feasibility of PECE algorithm based on the system.     

广东地区早籼稻外观与内在品质相关性研究

本文以广东地区收获期一致的22个不同品种的大米为研究材料,探讨原料大米外观与内在品质的相关性。结果表明,大米垩白度与食味品质之间为负相关,与直链淀粉含量呈现正相关关系;大米长度与食味品质呈现正相关关系,与直链淀粉含量为负相关;食味品质与直链淀粉含量之间为负相关。由此可知,稻米外观品质对内在品质具有一定的影响,垩白度低、粒型长度较长的大米口感较好。     

Irreversible development and eminent domain: Compensation rules, land use and efficiency

This paper examines the efficiency of eminent domain used to acquire green spaces, situations in which private investment permanently destroys the ecological externality value of land. The real option approach takes into account this irreversibility and changes established conclusions for the reversible investment case. Under irreversibility, eminent domain efficiency is more sensitive to compensation rules than previously thought. Setting compensation equal to what market value would be in the absence of eminent domain—the approach taken in the US and many other countries—reduces efficiency relative to losing the ecological externality to private development. Compensating at the market value under eminent domain threat increases efficiency, but not as much as compensation at social value does.     

嵌岩桩在铁路桥梁施工中的应用

随着现代成桩工艺、桩体结构的检测技术与桩的承载力等方面的进步和提高,桩与桩基础得到越来越广泛的应用,当桥梁上部结构荷载较大,而适合作为持力层的岩层又埋藏较浅,或虽然可作为持力层的土层埋藏不深但其下又存在软弱下卧层,用天然浅基础不能满足结构物对地基强度、变形和稳定性方面的要求时,嵌岩桩作为桩基础的一种形式往往是常用的一种基础。本文结合武广客运专线桥梁基础的施工,对嵌岩桩在铁路桥梁施工中的注意事项加以论述。     

Evidence of information transmission across currency futures markets using frequency domain tests

In this article, I examine the returns and volatility spillovers in the currency futures market incorporating the recently developed frequency domain tests. Such analysis allows differentiating between permanent (long-run) and transitory (short-run) linkages among the currency futures markets by investigating the causality dynamics at low and high frequencies respectively. I detect significant informational linkages between USD, EUR, GBP and JPY futures contracts in the Indian currency futures market. Evidence of innovations from USD futures market to other markets is the most significant for returns spillover and for volatility spillover, EUR is found to be the most significant compared to other currency futures contracts. The results would have implications for the market participants and policymakers.     

精密测长机在测量小尺寸标准环规中的应用

本文主要介绍测长机用单球头测量小于12mm的标准环规方法和测量精度。对于提高制造质量、实际生产具有一定的指导意义。