一种基于微波雷达回波信号的车型分类方法

车辆类型识别方法是智能交通系统的关键技术之一。利用深度学习的高维特征泛化学习能力,将改进的LeNet-5卷积神经网络用于基于交通微波雷达的大小车型分类识别。首先,以雷达触发前的N帧信号为基础,对雷达的回波信号进行分析并构建数据集;然后,分析LeNet-5卷积神经网络的特点;最后提出一种改进的LeNet-5卷积神经网络。实验结果表明,与传统的支持向量机方法相比,所提方法能够智能学习大小车的雷达时频信号特征,大小车型识别准确率达到97%以上,可为交通场景下的车型识别研究提供新的技术途径。     

The effects of product attributes and service quality of transportation card solutions on service user’s continuance and word-of-mouth intention

Service Business - Product attributes are an inherent quality considered as an essential factor for consumers’ purchasing intention for product. Despite the increase of consumer interest in...     

It's Not All Relative: The Effects of Mental and Physical Positioning of Comparative Prices on Absolute versus Relative Discount Assessment

In the context of three experiments, the authors examine the manner in which consumers compare a sale price to an explicit reference value. They find that a comparison of sale price to regular price may be more likely to involve an absolute (dollar amount) assessment, whereas a comparison of sale price to a competitor's price may be more likely to involve a relative (percent) assessment. The authors also find that vertical (i.e., columnar) placement of prices may result in a greater tendency to estimate discounts in relative terms. Conversely, horizontal (i.e., side-by-side) placement may result in a greater tendency to compute absolute numerical difference. The results provide important implications for retail managers in terms of framing and communicating price discounts.     

Ethical Commitment,Financial Performance,and Valuation: An Empirical Investigation of Korean Companies

A variety of stakeholders including investors, corporate managers, customers, suppliers, employees, researchers, and government policy makers have long been interested in the relationship between the financial performance of a corporation and its commitment to business ethics. As a subject of research, the relations between business ethics and corporate valuation has yet to be thoroughly quantified and investigated. This article is an effort to amend this inadequacy by demonstrating a statistically significant association between ethical commitment and corporate valuation measures. Consistent with anecdotal evidence, we have found a significant association between the ethical commitment of Korean companies and their valuation on the Korean stock market. However, the result reveals that the association between ethical commitment and financial performance is not significantly supported. Tae Hee Choi received Ph.D. from the Ohio State University, Ohio, USA. Presently working as Assistant Professor in accounting at the KDI School of Public Policy and Management. Research interests are business ethics, capital market, financial accounting, managerial accounting, and valuation. Jinchul Jung received Ph.D. from Kent State University, Ohio, USA. Presently working as Assistant Professor of Business Administration Department in the College of Business at Chosun University. Research interests are business ethics, family-supportive program, and organizational commitment.     

Adolescents' body‐tanning behaviours: influences of gender,body mass index,sociocultural attitudes towards appearance and body satisfaction

The goal of this study was to identify and examine the various factors affecting adolescents' body‐tanning behaviours. Gender, body mass index (BMI), sociocultural attitudes towards appearance (SATA) and body satisfaction were examined in order to determine how these variables influence both outdoor sun‐tanning and indoor tanning‐bed use. Self‐administered survey data were collected from 155 adolescent boys and 202 adolescent girls with an average age of 14.3. Multivariate analysis of variance and multiple regression methods were used to analyse the data. Adolescent girls tended to engage in both outdoor and indoor tanning. Overall, adolescents' SATA significantly affected their body‐tanning behaviours. However, BMI and body satisfaction revealed a significant effect only on indoor tanning behaviour. Implications for the design of interventions and overall health promotion towards adolescents are discussed with suggestions for future research.     

Effects of rollover strategies and information stability on the performance measures in options markets: An examination of the KOSPI 200 index options market

One of the most widely used option valuation models among practitioners is the ad hoc Black–Scholes (AHBS) model. The main contribution of this study is methodological. We carefully consider two rollover strategies (nearest‐to‐next strategy and next‐to‐next) used in the AHBS model to investigate their effect on pricing errors. We suggest a new rollover strategy, next‐to‐next strategy, and demonstrate that our rollover strategy produces more consistent estimates between in‐sample market and model option prices. Probably even more important is that our new rollover strategy makes more accurate out‐of‐sample forecasts for 1‐day or 1‐week ahead prices. Prior literature has documented some anomalies associated with the use of AHBS model, for example, an overfitting problem. A secondary contribution is that our new rollover strategy does not suffer from this overfitting critique. Third, this study uses the mean square error for out‐of‐sample pricing and price changes to determine how the options investors are influenced by moneyness. The results indicate that underpricing (or overpricing) by the AHBS model for the near‐the‐money category is more likely to be maintained for the next several trading days but that such a phenomenon is disappeared for the deep out‐of‐the‐money category. Finally, we suggest the ratio of the number of option contracts to differences in strike prices available for trading between the current day and the previous day(s) as a good categorizing factor for options, such as moneyness. © 2011 Wiley Periodicals, Inc. Jrl Fut Mark     

Dividend‐Rollover Effect and the Ad Hoc Black‐Scholes Model

One of the most widely used option‐valuation models among practitioners is the ad hoc Black‐Scholes (AHBS) model. The main contribution of this study is methodological. We carefully consider three dividend strategies (No dividend, Implied‐forward dividend, and Actual dividend) for the AHBS model to investigate their effect on pricing errors. We suggest a new dividend strategy, implied‐forward dividend, which incorporates expectational information on dividends embedded in option prices. We demonstrate that our implied‐forward dividend strategy produces more consistent estimates between in‐sample market and model option prices. More importantly our new implied‐forward dividend strategy makes more accurate out‐of‐sample forecasts for one‐day or one‐week ahead prices. Second, we document that both a “Return‐volatility” Smile and a “Return‐pricing Error” Smile exist. From these return characteristics, we make two conclusions: (1) the return dependency of implied volatility is an important explanatory variable and should be controlled to reduce the pricing error of an AHBS model, and (2) it is important for the hedging horizon to be based on return size, that is, the larger the contemporaneous return, the more frequent an option issuer must rebalance the option's hedge. © 2012 Wiley Periodicals, Inc. Jrl Fut Mark 32:742‐772, 2012     

Social entrepreneurship as an essentially contested concept: Opening a new avenue for systematic future research

Social entrepreneurship has emerged as an active area of practice and research within the last three decades. Nevertheless, in spite of its growing popularity, scholars and practitioners are far from reaching a consensus as to what social entrepreneurship actually means. This has resulted in a number of different definitions and approaches within the field of social entrepreneurship. The purpose of this article is to shed light on the ongoing contestation of social entrepreneurship and to offer a novel conceptual understanding of the concept that can facilitate the development of systematic and structured future research. To this end, we analyze social entrepreneurship on the basis of the theory of essentially contested concepts, which was proposed by Walter Bryce Gallie in 1956. Building upon this theory, this article shows that social entrepreneurship can be regarded as an essentially contested concept and that a universal definition that would be accepted among contestant parties is hardly possible. Responding to this recognition, the article proposes the conceptualization of social entrepreneurship as a cluster concept, which can serve as a conceptual tool to help advancing social entrepreneurship as a coherent field of research despite its contested nature.     

国际不对称税收竞争与FDI流动研究——兼议中美劳动力成本差异与美国减税下的应对策略

当前全球经济增长放缓,美国等发达国家竞相减税吸引外商直接投资.文章从劳动力成本、市场规模双重不对称的视角,构建了一个两国竞争FDI的理论模型,重点考察了两国均衡税收水平的差距.研究发现:市场规模相同时,劳动力成本较低国家的均衡税收较高;而劳动力成本、市场规模都不相同时,当且仅当劳动力成本较低国家的市场规模高于一定下限时,其均衡税收水平才高于另一国.以中美为例,本文利用2013～2018年两国相关数据的数值模拟分析也表明不对称税收竞争下的劳动力成本和市场规模因素解释了大部分FDI流动中两国税收差距的原因.介于此,在美国特朗普政府减税的挑战下,中国是否只能采用逐底型税收竞争策略,该研究提供了另外一种思路.     

Frontline service employees’ customer-related social stressors, emotional exhaustion, and service recovery performance: customer orientation as a moderator

This study investigates the structural relationships among customer-related social stressors (disproportionate customer expectation, ambiguous customer expectation, disliked customers, and customers?? verbal aggression), emotional exhaustion, and service recovery performance, with customer orientation (CO) serving as a moderator between customer-related social stressors and emotional exhaustion as well as emotional exhaustion and service recovery performance. The study uses data collected from a survey of 1,014 frontline service employees in Korea??s tourism service sectors. The results indicate that customer-related social stressors positively influence emotional exhaustion; emotional exhaustion negatively influences service recovery performance; and CO acts as a moderator. CO moderates both the effects of customer-related social stressors on emotional exhaustion and those of emotional exhaustion on service recovery performance, by weakening the effects for higher CO employees. This study contributes to both theory and practice by combining the four constructs of customer-related social stressors, emotional exhaustion, service recovery performance, and CO in addition to examining their relationships while focusing on customer-related factors.