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Investigating the Effects of Daily Travel Time Patterns on Short-term Prediction
오철,박세리 대한토목학회 2011 KSCE Journal of Civil Engineering Vol.15 No.7
Various studies on dealing with the prediction of traffic variables have been conducted in the field of intelligent transportation systems (ITS) because of its significant role in facilitating traffic operation and management strategies. In particular, travel time has been recognized as an important parameter of such traffic variables for fully facilitating many ITS applications. However, an important research issue that existing studies have disregarded is to understand the characteristics of travel time data prior to performing traffic predictions. This study attempts to characterize the temporal evolution of travel times (referred to in this paper as travel time patterns), and explore the relationship between the characteristics and the prediction accuracy. Entropies used in information theory are utilized to characterize travel time data obtained from an advanced traffic surveillance system. Furthermore,three different types of prediction techniques are employed to perform one-step-ahead travel time prediction. Statistically modeled relationships based on regression analysis imply that better prediction can be performed by identifying travel time patterns. It is believed that the proposed approach would effectively support to conducting better travel time prediction.
중국 제3자 모바일 결제시장에서 후발주자의 추격 성공 요인 분석 — 위챗페이의 오락성을 중심으로
오철,노수연,소사한 고려대학교 중국학연구소 2019 中國學論叢 Vol.0 No.63
China’s third-party mobile payment market is expected to grow at average of over 38% until 2019, following the establishment of Alipay in 2004. Wechat Payment has grown rapidly since 2013 as a latecomer, and has formed a duopoly market structure with Alipay. We analyzed common factors and individual factors that influence the behavioral intention and use behavior of Alipay and Wechat Payment through the modified UTAUT model. We found that usability, ease of acceptance, and ease of use play an important role in the behavioral intention of third party mobile payment service. In particular, hedonic motivation is the key factor behind the rapid growth of Wechat Payment. Tencent exploited ‘sociability’ by combining Wechat Payment with Wichat’s main interface, China’s most popular social networking service (SNS) and targeted a niche market such as financial transactions or free remittances between acquaintances. Most importantly, it held the interesting Red Packet events every year since 2014. As consumers will want to consume more pleasure and amusement in the future, it is necessary to build infrastructures that emphasize amusement aspects in financial services like Wechat Payment.
오철,허금정,이원행,양진아,김기태,Oh, Chul,Huh, Geum-jung,Lee, Won-haeng,Yang, Jin-ah,Kim, Ki-tae 대한한방내과학회 2016 大韓韓方內科學會誌 Vol.37 No.2
Objective: Acne scarring is the most common sequela after dermal inflammation caused by acne. Many methods are currently used to treat acne scarring; doctors using traditional Korean medicine have also attempted to treat acne scarring in a new way that was developed from traditional methods. This study examines the effectiveness of re-cell therapy.Method: Eleven patients with various types of acne scars were treated by re-cell therapy. We used the global acne scarring classification (GASC) and ECCA (from the French “echelle d’evaluation clinique des cicatrices d’acne”), both of which are generally used to measure and grade the degree of acne scarring.Results: As a result of the treatment, the conditions of all patients were conspicuously improved in both scales. The GASC scores of the patients changed from grade 19.6±10.4 to grade 4.9±3.3 (p=0.001), and the ECCA scores changed from grade 120.9±28.7 to grade 41.8±18.3.Conclusion: Re-cell therapy showed effectiveness in treating acne scarring and could be applied in clinical cases.