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Gravity currents and intrusions
Paul Linden 한국기상학회 2008 한국기상학회 학술대회 논문집 Vol.2008 No.-
Gravity currents and intrusions (gravity currents in stratified fluids) have been the subject of intensive research over the past 50 years. These flows arise naturally whenever there are horizontal density gradients in a fluid and can be found in many natural and man-made flows. Natural phenomena such as the sea breeze, the flow of river water into the sea, the intermingling of different water masses in the ocean, the "morning glory" in the atmosphere over Australia, pyroclastic flows from volcanic eruptions and man-made flows arising from the accidental release of dense gas in the atmosphere and even the debris from the demolition of a tall building are all examples of these flows. Despite their wide applicability and the long history of research into these flows many fundamental questions are only now being answered.
The Accessibility of Wireless Emergency Communications
Maureen Linden,Salimah LaForce,Helena Mitchell 한국재활복지공학회 2018 한국재활복지공학회 학술대회논문집 Vol.2018 No.11
This paper discusses the accessibility of emergency communication protocols for wireless Emergency Alerts (WEA). Two studies are presented. The first addresses barriers with the notification signals provided with WEA, while the second addresses barriers with the WEA message content. Both studies result in recommendations that could be incorporated into United States federal rulemaking to improve access to emergency messaging for people with disabilities.
UNDERSTANDING CUSTOMERS’ USE AND INVESTMENT TRAJECTORIES IN ACCESS-BASED DIGITAL PLATFORMS
Sam Van der Linden,Bert Weijters 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07
Digital revenues from music and video have surpassed the physical revenues and, remarkably, access-based services are solely responsible for the growth of digital revenues, whereas (legal) downloading behavior and revenues from paying for ownership are declining (ERA, 2017; IFPI, 2017). However, access-based digital consumption business models are heavily dependent on customers’ continued use of their services. Through two studies, this research aims to investigate customers’ behavioral trajectories in digital entertainment services. Study 1 examines cross-lagged effects of non-financial personal investment on frequency of use and vice versa, while relating attitudinal and demographical antecedents to both trajectories. Study 2 investigates the moderating influence of financial investment on the relation between non-financial investment on frequency of use in a video streaming service with a freemium business model and studies at what point in time users decide to switch from a free service to a paid service. The results of the first study indicate that there are effects of the frequency of use of a service on the amount of non-financial investment put in the service (i.e. creating a list of favorites for later consumption), but the effects of non-financial investment on frequency of use are only found for women. Furthermore, in line with the self-service literature, perception of hedonic rewards is the strongest predictor of frequency of use and the amount of non-financial investment made in the service. For men, perceived ease of use is negatively related with the amount of non-financial investment made, indicating that men are less likely to see the added value of personal investment, when it is easy to find what they are looking for. Lastly, older people perceive new digital entertainment platforms as less hedonically rewarding, less easy to use and less useful, suggesting that they are more favorably disposed towards traditional forms of entertainment, such as the traditional TV. The results of the second study are still in progress and will be presented at the 2018 GMC conference.
Standardization of the Korean Version of the Posttraumatic Embitterment Disorder Self-Rating Scale
Cheolmin Shin,Michael Linden,채정호,고영훈,김용구,김승현,조숙행,정인과,한창수 대한신경정신의학회 2012 PSYCHIATRY INVESTIGATION Vol.9 No.4
Objective Embitterment is a persistent feeling of being let down or insulted, feeling like a “loser”, or feeling revengeful but helpless. In South Korea, social injustice experienced during rapid industrial development and protracted unemployment during the Asian economic crisis may lead to strong feelings of embitterment. North Korean defectors and victims of industrial disasters may also experience humiliation and feelings of injustice. Posttraumatic Embitterment Disorder (PTED) is a recent conceptualization of a new psychiatric disorder. This study tested the reliability and validation of the Korean version of the PTED Scale. Methods Subjects aged 18 years or older were recruited from a psychiatric outpatient clinic. All subjects were diagnosed with a depressive disorder. Subjects completed the Korean version of the PTED Scale, the Patient Health Questionnaire (PHQ-9) and the Patient Health Questionnaire (PHQ-15) at baseline and two weeks later. Results Approximately 15.4% of subjects could be categorized as having PTED. The test-retest reliability of the PTED Scale was good (r=0.76) and the internal consistency was very high (Cronbach’s alpha=0.962). Positive correlations were found between the PTED Scale,the PHQ-9 and the PHQ-15, indicating substantial convergent validity of the PTED Scale. Conclusion The Korean version of the PTED Scale is a reliable and valid measurement of embitterment in Korean adults as an emotional reaction to a negative life event.