Management of Knowledge Sources Supported by Domain Ontologies: Building and Construction Case Studys

This paper introduces a novel conceptual framework to support the creation of knowledge representations based on enriched semantic vectors, using the classical vector space model approach extended with ontological support. This work is focused on collaborative engineering projects where knowledge plays a key role in the process. Collaboration is the arena, engineering projects are the target and knowledge is the currency used to provide harmony into the arena since it can potentially support innovation and, hence, a successful collaboration. The test bed for the assessment of the approach comes from the Building and Construction sector, which is challenged with significant problems for exchanging, sharing and integrating information among actors. Semantic gaps or lack of meaning definition at the conceptual and technical levels, for example, are problems fundamentally originated through the employment of representations to map the ‘world’ into models in an endeavour to anticipate other actors’ views, vocabulary and even motivations. One of the primary research challenges addressed in this work relates to the process of formalization and representation of document contents, where most existing approaches are limited and only take into account the explicit, word-based information in the document. The research described in this paper explores how traditional knowledge representations can be enriched through incorporation of implicit information derived from the complex relationships (semantic associations) modelled by domain ontologies with the addition of information presented in documents, by providing a baseline for facilitating knowledge interpretation and sharing between humans and machines. Preliminary results were collected using a clustering algorithm for document classification, which indicates that the proposed approach does improve the precision and recall of classifications. Future work and open issues are also discussed. Copyright © 2015 John Wiley & Sons, Ltd.     

Robust portfolio estimation under skew-normal return processes

In this paper, we study issues related to the optimal portfolio estimators and the local asymptotic normality (LAN) of the return process under the assumption that the return process has an infinite moving average (MA) (∞) representation with skew-normal innovations. The paper consists of two parts. In the first part, we discuss the influence of the skewness parameter δ of the skew-normal distribution on the optimal portfolio estimators. Based on the asymptotic distribution of the portfolio estimator ? for a non-Gaussian dependent return process, we evaluate the influence of δ on the asymptotic variance V(δ) of ?. We also investigate the robustness of the estimators of a standard optimal portfolio via numerical computations. In the second part of the paper, we assume that the MA coefficients and the mean vector of the return process depend on a lower-dimensional set of parameters. Based on this assumption, we discuss the LAN property of the return's distribution when the innovations follow a skew-normal law. The influence of δ on the central sequence of LAN is evaluated both theoretically and numerically.     

Uniqueness of stationary equilibria in bargaining one-dimensional policies under (super) majority rules

We consider negotiations selecting one-dimensional policies. Individuals have instantaneous preferences represented by continuous, concave and single-peaked utility functions, and they are impatient. Decisions arise from a bargaining game with random proposers and (super) majority approval, ranging from the simple majority up to unanimity. We provide sufficient conditions that guarantee the existence of a unique stationary subgame perfect equilibrium, and we provide its explicit characterization. The uniqueness of the equilibrium permits an analysis of the set of Pareto optimal voting rules. For symmetric distributions of peaks and uniform recognition probabilities unanimity is the unanimously preferred majority rule.     

Who gets the carrot and who gets the stick? Evidence of gender disparities in executive remuneration

This paper offers a new explanation of the gender pay gap in leadership positions by examining the relationship between managerial bonuses and company performance. Drawing on findings of gender studies, agency theory, and the leadership literature, we argue that the gender pay gap is a context‐specific phenomenon that results partly from the fact that company performance has a moderating impact on pay inequalities. Employing a matched sample of 192 female and male executive directors of U.K.‐listed firms, we corroborate the existence of the gender pay disparities in corporate boardrooms. In line with our theoretical predictions, we find that bonuses awarded to men are not only larger than those allocated to women, but also that managerial compensation of male executive directors is much more performance‐sensitive than that of female executives. The contribution of attributional and expectancy‐related dynamics to these patterns is highlighted in line with previous work on gender stereotypes and implicit leadership theories such as the romance of leadership. Gender differences in risk taking and confidence are also considered as potential explanations for the observed pay disparities. The implications of organizations' indifference to women's performance are examined in relation to issues surrounding the recognition and retention of female talent. Copyright © 2010 John Wiley & Sons, Ltd.     

Should special agricultural safeguard be ignored? An evaluation for dairy trade

This study measured the impact of special agricultural safeguards (SSG) on dairy products imports by the US and Japan. It was observed that dairy products have been the most affected by this protectionist measures, and that these countries are relevant importers that impose SSG. The tariff lines subject to SSG were selected, and the period of analysis was from 1995 to 2015. The results showed that the impact of SSG applied by the US was much higher than for Japan. The overall estimated value of imports that did not happen due to the application of SSGs was approximately USD 2 billion. Specifically for the Brazilian economy, the condensed milk not exported to the US due to SSG applied cost the country BRL 345 million in GDP value and almost 4.5 thousand jobs. These results might be underestimating these effects, since the SSG tariff was not subject to calculation in several years.     

The effect of physician board membership on uncompensated care provision

Previous studies indicate that nonprofit and for-profit hospitals provide comparable levels of uncompensated care, when taking into account their sizes. This evidence suggests that for-profit hospitals extract some indirect benefit when providing uncompensated care. Our article investigates how physician board membership affects uncompensated care provision. With data for hospitals in California from 1997 to 2010, we estimate a fixed-effect model where uncompensated care is a function of physician board membership, other board attributes, as well as hospital characteristics. Our results indicate that physician board membership in for-profit hospitals relates positively with uncompensated care provision. Prior evidence, such as Goldstein and Ward (2004) and Molinari et al. (1995), has shown that involving physicians in strategic decisions improves hospitals’ financial performance. Our results reinforce the notion that having physicians in leadership or strategic positions benefits for-profit hospitals. In these hospitals, physicians seem to understand the strategic component of providing uncompensated care, possibly due to their closer assessment of patients’ needs.     

乡村旅游创业动机的性别差异研究——以台湾为例

以往有关乡村旅游经营者创业动机的研究主要局限于拉力创业动机和不同性别创业者拉力创业动机研究。旅游研究学者提出应该对乡村旅游经营者动机进行更为理论化和系统的研究,并对乡村旅游经营动机的性别差异做进一步的探讨。该研究以台湾地区为例,比较性别差异下中小型乡村旅游经营者的创业动机模式。探索性因子分析结果显示,乡村旅游经营者拉力创业动机包括善用农业资源、社交、更换工作与政府政策鼓励等4个因子;推力创业动机则包括工作压力、自我压力与生活压力等3个因子。后续的多元方差分析(MANOVA)结果表明,女性的拉力创业动机明显高于男性,而男性的推力创业动机则明显高于女性。研究表明,女性从事乡村旅游产业经营主要是为了追求理想的生活方式与获得利益,而男性从事乡村旅游产业经营主要是因为对过去生活不满意。     

Why Do First-Time and Repeat Visitors Patronize a Destination?

Most studies of tourists' destination choices have either focused on how to attract more tourists or on developing stable relationships with existing ones. Therefore, the fit of a conceptual model incorporating relational (destination attachment) and transactional (destination image) antecedents to patronizing intentions (revisit, recommend, and resist change) was tested on a sample of first-time visitors and on a sample of repeat visitors to a hot spring destination in Taiwan. The findings indicated that first-time visitors' intentions to patronize the destination were mainly affected by destination image and that repeat visitors' intentions to patronize the destination were primarily affected by destination attachment. These findings highlight the importance of destination attachment and destination image in predicting tourists' patronizing intentions and future behavior, and reveal that researchers have overlooked that the antecedents of tourists' patronizing intentions differ depending on the type of relationship they have with the destination. As a result, this study provides compelling evidence for the need to clearly situate studies of destination choice in the transactional-relational continuum and questions the generalizability of previously published work that neglects to do so.     

Attributes Versus Benefits: The Role of Construal Levels and Appeal Type on the Persuasiveness of Marketing Messages

When should marketers emphasize attributes or benefits in their communications? Grounded in construal-level theory, the results of four studies suggest that when a purchase is planned for the distant future or when construal levels are high, benefit-based appeals are more persuasive than attribute-based appeals. By contrast, when a purchase is planned for the near future or when consumers are predisposed to low construal levels, attribute-based appeals are equally as persuasive as benefit-based appeals. However, when low construal levels are temporarily induced using a mind-set manipulation, attribute-based appeals are found to be more persuasive than benefit-based appeals. Moreover, we demonstrate how these effects occur only when processing fluency is uninhibited. This research establishes an important link between these appeal types and construal levels, subsequently demonstrating when marketers should use these appeals.     

Orthorexia Nervosa: Can Healthy Eating Food Trends Impact Food Companies Marketing Strategies?

The purpose of this article is to explore foods companies’ knowledge of food trends and assess how orthorexia nervosa may affect food companies’ marketing decisions. Data was gathered through a multiple case-study approach, and four semi-structured interviews to CEOs/CMOs of food companies from four distinct non-competing sectors of the food industry. The results show that although marketing managers are conscious of the existence of consumer behavior changes regarding food habits, they are not particularly concerned neither interested in micro-segments as they are not profitable. Despite the deficiencies on CMOs’ knowledge of particular food trends they declare to be attentive to the changes in consumer behavior and prepared to respond to competitors moves. This research adds to the existing knowledge on the food industry since it is the first study to explore the impact of food trends on food companies’ management marketing decisions from the company point of view.