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Analyzing the Adoption of Online Payment using System Dynamics
Hong-Lei Mu,Young-Chan Lee 대한산업경영학회 2018 산업융합연구 Vol.16 No.1
온라인 소매업은 인터넷 기반 회사들에게 전 세계의 온라인 고객들과 연결될 수 있는 기회를 제공했다. 그러 나 많은 고객들은 온라인 지불결제 서비스의 위험성이나 사용의 어려움으로 인해 원하는 상품을 선택하고도 온라인에 서 거래를 완료하지 못하는 경우가 종종 있다. 그동안 많은 연구자들이 온라인 지불결제에 영향을 미치는 요인들을 조 사했지만 온라인 시장 환경이 급격하게 변화되면서 향후 5년 또는 10년 후의 전개될 상황을 예측하기란 매우 어렵다. 본 연구의 목적은 온라인 지불결제에 영향을 미치는 요인들을 검토하고 제3자 결제 회사 및 온라인 서비스 제공 업체 에게 장기적인 동태적 의사 결정 모형을 제공하는데 있다. 이를 위해 본 연구는 온라인 지불결제 서비스 수용 모형을 개발하고 향후 10년 동안 전개될 상황을 시뮬레이션하기 위해 시스템 다이내믹스 기법을 사용하였다. 분석결과 온라인 지불결제 고객은 10년 안에 지속적으로 증가할 것이며 핵심 영향 요인으로는 서비스 품질, 시스템 품질 및 예상 소요 시간인 것으로 나타났다. Online retail business has provided internet-based companies with the opportunities to be connected with online customers from all over the world. However, many online customers do not complete their transactions online even if they have already choose what they want because they perceive online payment service is risky or perceive difficulty of paying online. A large body of researchers have examined the important variables that influence online payment, however, these studies can hardly predict the future development tendency after five or ten years since the environment of online market changes so fast more than ever. Therefore, the purpose of this study is to examine the importance of factors affecting online payment and to provide long term dynamic decision making model for third-party payment companies and online service providers. To serve the purpose, this study used system dynamics approach to develop a model of online payment adoption and to simulate various development paths for ten years. The analysis results show that the number of online payment customers increase continuously in ten years, and service quality, system quality, and effort expectancy are key factors for customers to pay online.
Intermedins A and B; New Metabolites from Schisandra propinqua var. intermedia
Hong-Mei Li,Chun Lei,Yong-Ming Luo,Xiao-Nian Li,Xiao-Lei Li,Jian-Xin Pu,San-Yun Zhou,Rong-Tao Li,Han-Dong Sun 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.6
A new dibenzocyclooctadiene lignan, intermedin A (1), and a new natural bisabolane sesquiterpenoid, intermedin B (2), were isolated from the aerial parts of Schisandra propinqua var. intermedia. Their structures were elucidated on the basis of extensive spectroscopical analysis.
( Lei Zhang ),( Ji T Gong ),( Hu Q Zhang ),( Quan H Song ),( Guang H Xu ),( Lei Cai ),( Xiao D Tang ),( Hai F Zhang ),( Fang E Liu ),( Zhan S Jia ),( Hong W Zhang ) 대한소화기기능성질환·운동학회 2015 Journal of Neurogastroenterology and Motility (JNM Vol.21 No.2
Background/Aims There are increasing evidences for gastrointestinal motility disorder (GIMD) and gastric stress ulcer induced by noise stress. The present study was to investigate the reversed effect of melatonin on GIMD and gastric stress ulcer induced by noise stress and potential mechanism. Methods Noise stress was induced on rats, and melatonin (15 mg/kg) was administered to rats by intraperitoneal injection. Differences were assessed in gastric residual rate (GRR), small intestine propulsion rate (SPR), Guth injury score, cortisol, gastrointestinal hormones (calcitonin-gene-related peptide and motilin) and oxidative stress markers (superoxide dismutase and malondialde hyde) in blood plasma as well as gastric mucosa homogenate with or without melatonin. The pathological examination of gastric mucosa was also performed. Results The GRR and SPR were improved by noise stress compared with control (P < 0.05). The pathological examination and Guth injury score revealed gastric stress ulcer. Moreover, the levels of cortisol, motilin and malondialdehyde in blood plasma and malondialdehyde in gastric mucosa homogenate were increased by noise stress (P < 0.05). CGRP and superoxide dismutase activity in both of blood plasma and gastric mucosa homogenate were significantly decreased (P< 0.05). Furthermore, melatonin reversed changes in GRR, SPR, pathological examination, Guth injury score, cortisol, motilin, CGRP, superoxide dismutase activity and malondialdehyde (P < 0.05). Conclusions Melatonin is effective in reversing the GIMD and gastric stress ulcer induced by noise stress. The underlying mechanism may be involved in oxidative stress and gastrointestinal hormones. (J Neurogastroenterol Motil 2015;21:189-199)
Dynamic Behavioral Portfolio Based on the Market Evolution
Hong-lei Zhang,Yi-xiang Tian,Li Li 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.8
Portfolio is the core issue of financial investment. This article discusses the dynamic behavioral portfolio in an evolutionary perspective. This paper first give the market selection equation as a measure of the investor market evolution level to replace the mental account of investors return, considering the impacts of heterogeneous investors to the asset return, this paper establish an adaptation GARCH model to express the dynamic evolution of asset return and risk. And considering the non-linear relationship among assets, this paper chose Clayton Copula function to put the risk of each asset into a single unified security mental account, and establish the VaR model to control investment risk and obtained the optimal weights of behavioral portfolio in each investing period. Last this paper implemented the model of the dynamic behavioral portfolio based on the market evolution in the historical data, and gave the comparison results of the dynamic behavioral portfolio based on the market evolution, to the mean-variance model and the minimum variance model. Empirical result shows that the dynamic behavioral portfolio based on the Market Evolution has a very good investment effects.