基于Geortzel算法实现高效多路DTMF检测

基于戈泽尔算法,可得到一种DTMF检测的高效算法,本文描述了这种算法及使用该算法在TMS320S50上实现的30路DTMF检测器。     

Firm Shutdown During the Financial and the Sovereign Debt Crises: Empirical Evidence from Portugal

This paper examines Portuguese firms’ survival over the business cycle and investigates whether the effect of firm size varies across the phases of the cycle and with the type of shock associated with periods of economic contraction. Our results show that smaller firms are more likely to shut down than larger firms. Within each size band, however, we found that during the two crises examined, micro firms experienced hazards of closing (relative to large firms) at least similar to those observed in the pre-crisis period, while medium-sized firms were found to have been more vulnerable during the financial crisis period but showed more resilience during the sovereign debt crisis. The results suggest that during the sovereign debt crisis, firms faced a higher probability of closing than they did during the financial crisis.     

海面低仰角数字微波通信系统性能及体制分析

本文介绍了海面低仰角数字微波通信系统的特点，对海面电波多径衰落进行了理论计算，指出了通信系统抗衰落的方法和手段，并给出了一种抗衰落通信系统在海面通信试验中的测试数据。     

Do not say a word! Conceptualizing employee silence in a long-term crisis context

Abstract

Although research has emphasized the organizational and individual factors that influence employee voice and silence at work, it is less known how employee voice/silence is affected by the economic context, particularly when this context is one of intensive and long-term economic crisis in a country with weak institutional bases. In this study, we explore how employee silence is formulated in long-term turbulent economic environments and in more vulnerable organizational settings like those of small enterprises. The study draws on qualitative data gathered from 63 interviews with employees in a total of 48 small enterprises in Greece in two periods of time (2009 and 2015). This study suggests a new type of employee silence, social empathy silence, and offers a conceptual framework for understanding the development of silence over time in particular contexts of long-term turbulence and crisis.     

Seeing history: a visual assessment of the historic-grounding of Old Western tourist towns

Despite the significant role that the visual plays in the experience of tourism, few studies have specifically examined the visual appearances of heritage tourist destinations. This study sought to analyze how historically grounded the visual appearances were of two heritage tourist towns in the state of Arizona: Tombstone and Jerome. These towns were both mining towns that experienced historic booms during the days of the American Old West and survive today as tourist destinations. This study utilized a detailed visual comparison of historic and contemporary town photographs in order to assess the relative historic-grounding of building exteriors and streets. It also incorporated the findings of interviews with tourists and town residents regarding their perceptions of visual historic-grounding. Study findings offered a means to assess and compare visual historic-grounding. Additionally, they suggested that while visual historic-grounding was important to visitors, it was one of several factors influencing their perceptions of the town's historic appearance: visual appeal, personal reflections, engaging activities, and previous visitor expectations of the American Old West (often grounded in filmic-representations) worked together to visually communicate a general impression of history within each town.     

Hotel school alumni’s intentions to use communication channels – a cross-generational comparison study

ABSTRACT

Alumni communication is vital in sustaining the relationship between alumni and their alma maters. This research investigated four cohorts of alumni, and their intentions to use a range of traditional and digital communication channels, including social media. An online questionnaire was sent to 8060 alumni and resulted in 595 usable responses, yielding a 7% response rate. The research results showed that alumni have the highest intentions to use the alumni e-newsletter and the alumni Website and the lowest intentions to use social media, e.g., Twitter, Instagram, and YouTube. Among alumni cohorts, significant statistical differences in their intentions to use these communication channels were identified. Given our findings, alumni communication staff are encouraged to leverage different communication channels targeting alumni in different age groups.     

NFC协议的模糊测试优化方案

针对NFC协议进行模糊测试方案时产生大量不符合协议规范的无效测试用例而导致测试效率较低的问题,应用图论思想,提出了基于生成的策略与深度优先算法融合后的模糊测试方案。在基于生成的策略下构造测试用例的过程中,遍历由协议规范连接成的测试需求图,以深度优先算法搜索图中覆盖点较多的生成路径,精简测试用例的生成路径,保证生成的测试用例能够接近协议规范。实验分析表明,所提出的模糊测试方案能够有效地减少无效测试用例的生成,提高测试效率。     

A theoretical framework of electronic word-of-mouth against the backdrop of social networking websites

This study proposed and tested a theoretical framework that explains electronic word-of-mouth (eWOM) against the backdrop of social networking websites (SNWs), which have gained substantial popularity among travelers. In particular, a United States (US) nationwide online survey was conducted and nine hypotheses were tested. The findings suggest that willingness to share knowledge and switching costs are positively related to eWOM communication. In addition, customer value (utilitarian) has positive relationships with willingness to share knowledge, perceived security, and switching cost, while customer value (hedonic) has positive relationships with willingness to share knowledge and switching costs. Last but not least, the findings indicate that perceived security does negatively impact eWOM. In light of the major findings, the article sets forth strategic implications for travel-related social networking websites.     

Empowerment in hospitality organizations: Customer orientation and organizational support

Although empowering employees has often been prescribed as an efficient strategy for hospitality organizations, the strategy alone cannot ensure success. Individual and organizational factors should be considered to increase employees’ perception of empowerment. This study examines the impact of employees’ customer orientation and organizational factors on the employee empowerment perceptions. Our findings, based on a survey of 203 guest contact employees, suggest that organizations should hire customer oriented people, guide them with service training, provide a reward system, and facilitate service standards communication in order to increase perceived empowerment. Implications of these findings for hospitality service managers are discussed.