基于CenterNet的跑步姿态鉴别系统的设计

为了改善目前大众跑步姿势普遍不规范的现状,提出了一种基于CenterNet的跑步姿态鉴别系统。首先,通过截图、拍照的方式自制数据集,并对数据集进行清洗、标注和分析,消除数据无关信息与简化数据。其次,引入多尺度通道注意力机制与添加十字星变形卷积2种方式改进CenterNet算法模型,将动作图像转化为数字信息和特征向量,并以此为基础,利用KNN（K-nearest neighbors）算法对跑步姿态类型进行分类。最后,与经典模型方案进行对比,验证改进CenterNet算法鉴别系统的有效性。结果表明：改进的CenterNet模型的精确率与召回率都有所提升,其参数量与计算量降低。所提算法模型能够对大多数不良姿势作出及时、准确反馈,有效帮助跑步爱好者发现问题,从而改善跑步姿态、提高运动效率、预防伤病。     

坚持还是放弃：失败恐惧的认知效应及其对创业坚持的影响

基于情绪认知评价理论,从情绪和认知两个视角分析失败恐惧对创业坚持的影响与边界条件。通过对316名创业者的问卷调查发现：创业失败恐惧对创业坚持行为具有负向影响;自我效能感在失败恐惧和创业坚持之间发挥中介作用;成长型思维调节失败恐惧对自我效能感的负向影响,成长型思维通过降低失败恐惧对自我效能感的负向作用来促进创业坚持行为。依据“情感—认知—行为”的逻辑从创业者的情绪和认知视角综合分析失败恐惧对创业坚持的影响,既为创业者中途退出创业活动提供解释思路和理论洞见,也为全面理解创业坚持行为提供理论指导。     

试析西方经济学“经济人”假设的发展及其局限性——基于对马克思相关观点的理解

"经济人"假设关注个人的利益目标及实现目标的能力,而马克思在刻画个人时还特别强调了社会关系对个人行为选择的约束。笔者立足于对马克思相关观点的理解,探讨秉承斯密个人主义思想的西方经济学流派对"经济人"假设的继承和发展,试图揭示这一个人观念进一步发展遇到的困惑。遵循方法论个人主义原则,西方学者要从追逐自身利益的"经济人"出发,解释约束其实现自身利益的因素形成和变迁的原因,从而不得不面对引入另一种个人行为模式的尴尬。     

The effect of strike militancy intentions and general union attitudes on the Organizational Citizenship Behavior of university faculty

Using a sample of unionized faculty, this study investigated whether faculty members' militancy intentions and general union attitudes affected their level of organizational citizenship behavior (OCB). OCB was divided into three dimensions (OCB-teaching, OCB-faculty, and OCB-university), and separate predictions were made for each. Results indicated weak relationships at best between the predictor variables and OCB, suggesting that unionization is not likely to affect this important aspect of job performance.     

考虑消费者行为的易逝品动态定价研究

在消费者有限理性行为上考虑其策略型和短视型的不同特征,在非理性行为上考虑支付意愿、风险偏好及参考价格三个衡量维度,综合构建消费者效用函数,研究了在消费者行为异质作用下,易逝品零售商的动态定价,并运模拟算例对上述研究进行了演算。研究表明：消费者风险偏好程度较高时,零售商收益会随着策略消费者比例和消费者估值折扣系数的增大而减小,风险偏好较低时可缓解或消除策略消费者的不利影响;零售商的最优定价策略为降价策略;第二阶段消费者产品获得率会对零售商收益产生影响。     

Rationality of weather predictions and insurance purchases: testing the gambler’s and hot hand fallacies

Deviations from the rational behaviour assumed in many economic models have been found in a variety of settings. Two such deviations, the gambler’s and hot hand fallacies have been found in lab settings, as well as in consequential real-world decisions. Previous economic experiments have shown that the behaviour of professionals can differ from that of the general population. In this paper, we use data from two experiments conducted with a particular group of professionals who make yearly high-stakes decisions in the face of uncertain weather and market conditions: agricultural producers. In the experiments, participants were asked to make predictions about the coming year’s weather and market conditions and make decisions in a familiar decision context. Results indicate evidence of the gambler’s fallacy, such that participants were less likely to predict a good outcome if the previous outcome(s) were good. We also observe that participants were more likely to gamble if a previous gamble was successful, but find no impact on two successful gambles. These combined results indicate that even professionals with many years of experience can exhibit behaviours that deviate from those assumed by classical models.     

收获信任与温暖的新潮旅游群体——对沙发客的初步研究

源于欧美的沙发冲浪是一种新颖时尚的互助旅游方式。相比于传统的旅游模式,基于网络信任的沙发冲浪具有情感投入、体验充分、成本低廉等特点。借助ROST WordParser词频分析软件,通过对相关沙发客网站的文本内容进行分析,总结出沙发客旅游行为的50个高频词汇,并归纳为动机、感知、活动、交通方式、沙发城市、游玩地点等六大类目。研究发现,＂朋友＂和＂温暖＂在文本词汇中出现频率最高,结交朋友、扩展人脉是沙发客的主要旅游动机之一,受到热情接待、体会家庭温暖是沙发客的共同感知;＂联系＂、＂聊天＂、＂游览＂构成沙发客的基本活动;＂火车＂、＂搭车＂与＂公交＂组成交通方式的关键词汇;国际大都市＂上海＂、＂北京＂及风景如画的＂厦门＂、＂杭州＂成为热门目的地;＂景点＂、＂大学＂与＂公园＂是沙发客关注的游玩地点。     

A Critical Investigation of the Bargaining Behavior of Tourists: The Case of Hong Kong Open-Air Markets

Shopping has long been recognized as an indispensable tourist activity. Hong Kong's open-air markets, where a multitude of bargaining activities can be observed, ranked as the second most popular of the island territory's diverse range of attractions in 2008 in terms of tourist arrivals. To develop cutting-edge marketing strategies that promote tourists' enjoyment of their bargaining adventure and ultimately enhance the overall shopping experience, the study reported in this article was aimed at identifying the dimensions underlying tourists' perceptions of the importance of 18 bargaining motivators and 12 bargaining attitudes and types of bargaining behavior, respectively, and subsequently evaluating the predictability of these underlying dimensions on tourists' shopping contentment indicators (overall bargaining satisfaction, the likelihood of a subsequent visit, and the likelihood of recommending open-air markets to others). A non-probability quota sampling technique was used to survey 203 Asian and non-Asian tourists in Hong Kong. A multivariate approach encompassing factor analysis and multiple regression was employed: Factor analysis delineated four underlying dimensions of factors affecting bargaining intentions. “Value for money” was shown to be the factor rated most important to tourists' bargaining intention; similarly, two underlying dimensions of bargaining attitudes and behavior—“bargain for psychological well-being” and “bargaining intensity”—were identified. Multiple regression results indicated the statistical significance of “bargaining for psychological well-being” and “bargaining intensity” to the existence of positive relations between shopping contentment indicators.     

Risk Perception and Buying Behavior: An Examination of Some Relationships in the Context of Cruise Tourism in Jamaica

Cruise tourism continues to grow substantially, even as many other forms of travel stagnate. In this era of increasing worldwide violence against tourists, safety, security, and risk abatement are becoming principal components in travelers' decision-making processes. This work examines the issue of perceived risk and safety and what impact these perceptions have on shopping behavior. The research takes place in Jamaica, a country with a reputation for aggressive vendors. Findings indicate that those visitors who traveled with others spent more time shopping and purchased more. Additionally, it was found that first time visitors express higher levels of discomfort with their surroundings than did repeat visitors, thus inhibiting purchase behavior. Finally, it was found that levels of perceived risk and security did have an impact on a traveler's intention to return to Jamaica.     

Using verbal attention to enhance restaurant customer satisfaction and behavior

Managing and developing positive customer relationships is a critical factor in the success of a restaurant. In this study, waitresses either asked customers about their satisfaction with the food or service before proposing tea or coffee, or they directly proposed coffee or tea without asking about satisfaction. It was found that the number of customers who ordered coffee/tea was significantly higher when the waitress asked the customers about their satisfaction. The theoretical and practical interest of studying the effect of verbal communication toward customers is discussed.