Term frequency – function of document frequency: a new term weighting scheme for enterprise information retrieval

In today's business environment, enterprises are increasingly under pressure to process the vast amount of data produced everyday within enterprises. One method is to focus on the business intelligence (BI) applications and increasing the commercial added-value through such business analytics activities. Term weighting scheme, which has been used to convert the documents as vectors in the term space, is a vital task in enterprise Information Retrieval (IR), text categorisation, text analytics, etc. When determining term weight in a document, the traditional TF-IDF scheme sets weight value for the term considering only its occurrence frequency within the document and in the entire set of documents, which leads to some meaningful terms that cannot get the appropriate weight. In this article, we propose a new term weighting scheme called Term Frequency – Function of Document Frequency (TF-FDF) to address this issue. Instead of using monotonically decreasing function such as Inverse Document Frequency, FDF presents a convex function that dynamically adjusts weights according to the significance of the words in a document set. This function can be manually tuned based on the distribution of the most meaningful words which semantically represent the document set. Our experiments show that the TF-FDF can achieve higher value of Normalised Discounted Cumulative Gain in IR than that of TF-IDF and its variants, and improving the accuracy of relevance ranking of the IR results.     

地感线圈在车辆通行自动检测控制系统中的应用

本文对基于地感线圈的车辆通行自动检测控制系统进行了研究。由于线圈电感量的变化,使得由三点式LC振荡电路构成的检测电路输出的波形频率发生变化,再经过波形整形电路送入单片机,单片机检测到频率变化来控制电机运转。采用这种方法可以使得当有车辆经过时,挡车器可以自动抬升档杆。而且当杆下有车辆时可以及时停止落杆,防止砸中车辆。具有较高的实用价值和应用前景。     

消费者的CSR-CA观念及其对CSR与购买意向关系的影响研究

实证研究表明,在企业社会责任（CSR）与企业能力（CA）关系方面,绝大多数消费者持相互促进（Win—Win）观念而不是相互对立（Trade—off）观念。进一步研究显示,同样是持Win—Win观念的消费者,程度不同,对CSR与购买意向关系有不同的影响：持强CSR—CA相互促进观念的消费者与持弱CSR—CA相互促进观念的消费者对CSR水平较高和一般的企业生产的产品的购买意向没有显著差异,但对于CSR水平较低的企业生产的产品,前者的购买意向显著低于后者。     

The effects of the visual presentation of an Influencer's Extroversion on perceived credibility and purchase intentions—moderated by personality matching with the audience

Influencers are ordinary individuals who have amassed large followings by demonstrating expertise in various niches on social media sites. We aim to propose (1) the visual presentation of an Influencer's extroversion as an antecedent to source credibility and purchase intentions and (2) personality matching in terms of extroversion between an Influencer and their audience as a moderator of such relationships. We chose the source credibility model and the similarity-attraction model as our theoretical frameworks. In our controlled online experiment (n = 165), the profile of a brand ambassador of a fashion brand was curated to create two levels of extroversion (i.e. low vs. high extroversion). Participants' self-reported extroversion levels were counterbalanced in these two conditions to create a personality match with the Influencer, entitled “extroversion congruence.” Our results suggest that the visual presentation of an Influencer's extroversion increases the perceived credibility of the Influencer and subsequent purchase intentions. Additionally, our findings show that these relationships were asymmetrically moderated by extroversion congruence: the positive effects of extroversion increase in the case of high extroversion among both the Influencer and their audience but decrease in the case of low extroversion.     

What influences consumers’ intention to purchase organic personal care products? The role of social reassurance

Green and organic markets have grown rapidly in recent times, thanks to the increasing global popularity of having a healthier lifestyle. Rising consumer awareness of the risks of synthetic chemicals for humans as well as the environment have boosted the demand for organic personal care products (PCPs). To better understand the micro-mechanisms guiding the organic PCPs buying process, this study builds on the social proof theory by examining the drivers leading this process in two different national contexts. Partial least squares structural equation modelling was used to conduct a multigroup analysis on a sample of 473 consumers (n = 266 from Spain, n = 207 from Italy). Findings reveal the significant role of environmental value, product knowledge, convenience & quality, and information adoption. Furthermore, the study introduces and validates the new construct ‘social reassurance’ explaining the psychological mechanisms leading the organic PCPs buying process.     

Determinants of consumers’ aesthetic responses to Point‐of‐Purchase materials

The four‐dimensional nature of the Kaplans’ model of aesthetic response to images was tested on Point‐of‐Purchase (POP) material. It was found that only two robust dimensions emerged in the analysis, Clarity and Mystery. These however, had a significant influence on the subjects’ rating of the POP’s attractiveness. Path analysis suggested each of these dimensions was independent of the other. The implications of the findings are discussed and possible future areas of research identified.     

房地产限购政策的有效性及外部性评估

为了抑制房价过快上涨,需求侧的房地产宏观调控是中国现阶段的重点,限购是最常用的政策工具之一,其影响受到大众和学术界的关注。虽然限购政策的有效性已有不少学者关注,但结论尚不一致,且缺乏对限购政策外部性影响的经验研究。因此,本文基于房地产销售与租赁市场和土地市场的日度交易微观数据,利用双重差分模型更准确地评估了限购政策抑制房价的有效性,并进一步将各市场领域的关联性纳入分析框架,探究了限购政策对房地产租赁市场与土地市场的外部性效应。实证结果表明,限购使房价下降10.12%,大于以往研究的估计结果;限购使房租上升25.09%,住宅地价下降9.08%,但对工业和商业地价没有显著影响。倾向得分匹配等一系列稳健性检验和反事实分析均显示实证结果的可靠性。限购政策的外部性表明,该政策不利于改善实际住房需求者的福利,且可能引发地方政府的"软性抵抗",未来的工作重点应在加强地方税体系建设基础上不断深化土地和房地产的供给侧改革。