概念隐喻的语篇连贯功能探究——以奥巴马2010年国情咨文为例

语篇连贯一直是语篇分析的重要环节。Lakoff&Johnson的概念隐喻理论从认知语言学的角度拓展了语篇连贯的研究。文章以Lakoff&Johnson的概念隐喻理论作为理论框架,以奥巴马总统2010年国情咨文作为研究语料,试从由单个概念隐喻构成的连贯系统和由多个概念隐喻构成的连贯系统两个层面探究概念隐喻如何起到语篇连贯的作用。     

The state of innovation system research: What happens beneath the surface?

Since its emergence in the 1980s, the concept of “Innovation Systems” (IS) has inspired research and shaped discussions in academia and policy alike, leading to a cascading development of approaches and extensions at various analytic levels. IS research has expanded far beyond its initial focus by generating new knowledge within but also attracting increased attention from adjacent fields. As a result, the broad understanding of IS and its diversity in applications has resulted in blurry boundaries of the field, making its contemporary delineation, synthesis, and assessment of its progress challenging. Using a combination of data-driven techniques from bibliometrics, natural language processing, and network analysis, this paper maps and analyzes the structure of knowledge production and the process of knowledge integration in current research. We find an overall growing tendency toward increasing diversity in the knowledge bases from which the field draws, accompanied by a decreasing coherence of collective research efforts. We point to the crucial role of institutions and academic entrepreneurs in shaping these developments in interdisciplinary and diverse fields, illustrating this by the role of the Organisation for Economic Co-operation and Development (OECD).     

Text structure and patterns of cohesion in narrative texts written by adults with a history of language impairment

This paper examines text structure and patterns of cohesion in stories written by a group of adults with a history of childhood language impairment. The study aimed to extend our knowledge of writing difficulties in this group by building upon a study that examined clause level phenomena (Smith-Lock, Nickels, & Mortensen, this issue). Ten adults with a history of Language Impairment and 30 control participants were asked to write the story of Cinderella. Stories were analyzed for their generic structure and cohesion resources, both of which contribute to the organization and coherence of a text. Results revealed that patterns of text organization at the level of generic structure and measures of cohesion did not distinguish the performance of writers with a history of Language Impairment from the comparison group. A wide range of lexico-grammatical skills was evident within the Language Impaired group, with few individuals with Language Impairment falling outside the normal range of performance. It is suggested that generic structure and cohesion are a relative strength in the writing of adults with Language Impairment, within the constraints of their lexical and grammatical skills.

基于颜色一致向量的图像检索方法

大量图像信息的产生使得基于内容的图像检索技术成为研究热点.由于颜色特征具有稳定性和计算简单的特点,本文首先介绍了利用全局颜色直方图进行图像检索的基本思想,然后分析了它的局限性,并给出了改进的方法:特征提取采用结合空间信息的颜色一致向量方法.在特征度量时,依据所设计的评价实验,对这两种方法进行了比较,并给出了实验结果和图像检索性能的评价.实验表明,所述的图像检索方法具有较好的查全率和查准率.     

Do policy mix characteristics matter for low-carbon innovation? A survey-based exploration of renewable power generation technologies in Germany

Policy mixes may play a crucial role in redirecting and accelerating innovation towards low-carbon solutions, thus addressing a key societal challenge. Towards this end, some argue that the characteristics of such policy mixes matter greatly, yet with little empirical evidence backing up such claims. In this paper we explore this link between policy mix characteristics and low-carbon innovation, using the research case of the transition of the German electricity system towards renewable energy. Our empirical insights are based on an innovation survey administered to German manufacturers of renewable power generation technologies which builds on the Community Innovation Survey. For our purposes we adjusted the survey to better capture companies’ perceptions of policy mixes. Employing a bivariate Tobit model we find evidence that companies’ perceptions regarding the consistency and credibility of the policy mix are positively associated with their innovation expenditures for renewable energies, and this positive link intensifies when considering the mutual interdependence of these policy mix characteristics. In contrast, neither the comprehensiveness of the instrument mix nor the coherence of policy processes were found to be related to innovation expenditures. Overall, these findings suggest that future research on low-carbon and eco-innovation should pay greater attention to the characteristics of policy mixes, rather than focusing on policy instruments only. Finally, our findings indicate a need to consider how policy may be measured in innovation surveys to generate better informed policy advice regarding the greening of innovation.     

移动的右边界

分段式话语表现理论的核心概念是话语关系,它影响话语层级结构和右边界的定义。话语关系包括并列关系和从属关系两种基本类型。在独白式话语中,从属话语关系不能变为并列话语关系。但是在对话中,从属话语关系可能变为并列话语关系,因此右边界也发生了改变。话语关系的性质属于话语中信息打包层面,它不像信息内容层面的关系语义那样稳定。右边界是一个需要仔细运用的话语原则。     

基于液相ZnSe量子点光源的光学层析成像系统

提出一种离散化的光学层析成像方法用于提取检测物的纵向深度信息和光谱特性。利用液相的ZnSe量子点为光源,设计了分立的元件组成光学层析装置,提取了多层媒质的信息。在理论上分析了模型的有效性;在实验上,利用五层媒质验证了该方法的可行性。基于此方法的研究可以广泛地应用于光学成像、生物芯片等许多领域。     

试论光场的相干极限

本文在统计光学的二阶相干性理论基础上对由定义的完全相干光场性质进行了数学证明和物理注释。介绍了一种条件较弱,然而更为实用的Mandel—Wolf相干光场定义以及其在准单色光场的应用。     

Time-domain clustered transmit power adaptation for OFDM system in fading channels

INTRODUCTION The growing demand for wireless multimedia services requires reliable and high data rate commu- nications over a wireless channel. However, the reli- ability is significantly limited by the ability of com- bating the intersymbol interference (ISI) introduced by the time dispersive nature of the wireless channel. Multicarrier transmission systems, especially OFDM systems, have aroused great interest in recent years as a potential solution to overcome ISI (Hanzo et al., 200…     

Abnormal cortical functional connections in Alzheimer＇s disease： analysis of inter- and intra-hemispheric EEG coherence

To investigate inter- and intra-hemispheric electroencephalography (EEG) coherence at rest and during photic stimulation of patients with Alzheimer‘s disease (AD). Thirty-five patients (12 males, 23 females; 52-64 y) and 33 sex- and age-matched controls (12 males, 21 females; 56-65 y) were recruited in the present study. EEG signals from C3-C4, P3-P4, TS-T6 and O1-O2 electrode pairs resulted from the inter-hemispheric action, and EEG signals from C3-P3, C4-P4, P3-O1, P4-O2, C3-O1, C4-O2, TS-O1 and T6-O2 electrode pairs resulted from the intra-hemispheric action. The influence of inter- and intra-hemispheric coherence on EEG activity with eyes closed was examined, using fast Fourier transformation from the 16 sampled channels. The frequencies of photic stimulation were fixed at 5, l0 and 15 Hz, respectively. The general decrease of AD patients in inter- and intra-hemispheric EEG coherence was more significant than that of the normal controls at the resting EEG, with most striking decrease observed in the alpha-1 (8.0-9.0 Hz) and alpha-2 (9.5-12.5 Hz) bands. During photic stimulation, inter- and intra-hemispheric EEG coherences of the AD patients having lower values in the alpha (9.5-10.5 Hz) band than those of the control group. It suggests that under stimulated and non-stimulated conditions, AD patients had impaired inter- and intra-hemispheric functional connections, indicating failure of brain activation in alpha-related frequency.