• Journal of Service Research and Studies
• /
• v.9 no.4
• /
• pp.19-40
• /
• 2019

Mobility as a Service is a service conception to achieve the intelligent transportation system. Its aims to improve the travel experience. In one platform, it connects various transportation modes to offer service and users only need to pay in one time for the whole travel. But the single MaaS platform easily faces the problems such as low user traffic, low retention rate and the access to markets of the this service is still unfound. From the perspective of bicycle-sharing, this research makes the MaaS concept into bicycle-sharing to build a better service model. The bicycle-sharing combine with the MaaS concept is innovative in business model, travel model and service architecture. In addition, this research also tests users' expectations for service model. The research shows that MaaS-based bicycle-sharing could offer flexible and convenient travel experience in the aspects of combined transportation, travel, transfer and payment, and it also makes it possible to make travel services according to need, and sustainable transport.

• Journal of Digital Convergence
• /
• v.13 no.3
• /
• pp.31-36
• /
• 2015

The Many universities and educational institutions have focused on shifting education paradigm into smart learning using high-tech devices and internet as the level of technology has growing rapidly in every society. Especially, cyber universities and open universities in Korea are trying to develop educational network system and infrastructure corresponding to new convergence technology environment. Therefore, the purpose of this study is to introduce clouded based education system in order to suggest an effective way of using new educational learning system. This study shows the case of Hangout learning system used in K University in Korea to suggest a new educational learning model for real-time lecture and cloud based service platform for improving educational learning environment.

• Korean Journal of Optics and Photonics
• /
• v.16 no.3
• /
• pp.275-286
• /
• 2005

The performance of the InGaN LED's in terms of the photon extraction efficiency has been analyzed by the Monte Carlo photon simulation method. Simulation results show that the sidewall slanting scheme, which works well for the AlInGaP or InGaN/SiC LED, plays a very minimal role in InGaN/sapphire LED's. In contrast to InGaN/SiC LED's, the lower refractive index sapphire substrate restricts the generated photons to enter the substrate, minimizing the chances for the photons to be deflected by the slanted sidewalls of the epitaxial semiconductor layers that are usually very thin. The limited photon transmission to the sapphire substrate also degrades the. photon extraction efficiency especially in the epitaxial-side down mount. One approach to exploit the photon extraction potential of the epitaxial-side down mount may be to texture the substrate-epitaxy interface. In this case, randomized photon deflection off the textured interface directly increases the number of the photons entering the sapphire substrate, from which they easily couple out of the chip and thereby improving the photon extraction efficiency drastically.

• Polymer(Korea)
• /
• v.39 no.2
• /
• pp.293-299
• /
• 2015

Conductive microcellular foams consisted of polystrene (PS) and polydopamine-coated carbon nanotube (PDA-CNT) were prepared via high internal phase emulsion (HIPE) polymerization and their morphology and electrical conductivity were investigated. CNT as a conductive nanofiller was modified to PDA-CNT by coating with hydrophilic PDA on the surface of CNT to increase aqueous phase dispersion and emulsion stability. It was possible to prepare the HIPEs having higher PDA-CNT content and the resultant foams having improved conductivity due to its good dispersion. The foams showed the morphology of interconnected cell structure. As PDA-CNT content increased, yield stress and storage modulus increased and cell size reduced. The PDA-CNT content showing electrical percolation threshold was ca. 0.58 wt% and the conductivity at PDA-CNT content of 5 wt% was increased to $10^{-3}S/m$.

• Journal of the Korean Wood Science and Technology
• /
• v.29 no.4
• /
• pp.89-96
• /
• 2001

Three isoflavones and one isoflavanone were isolated from the wood of Sophora japonica (Leguminosae) which has been selected due to its high antifungal activity among the tested species, Four compounds were identified as 5,7-dihydroxy-4',6-dimethoxyisoflavone (irisolidone), 5,7-dihydroxy-4'-methoxyisoflavone (biochanin A), 7-hydroxy-4'-methoxyisoflavone (formononetin) and 7-hydroxy-4'-methoxy-isoflavanone by Mass and NMR spectroscopic analysis. The antifungal activity of the isoflavonoids was tested by medium dilution method and showed low antifungal activity indicating that the other compounds may contribute to high activity of the wood extractives of S. japonica.

• Elastomers and Composites
• /
• v.45 no.2
• /
• pp.94-99
• /
• 2010

340 nm UV radiation of $2500\;kJ/m^2$ irradiated a thermoplastic elastomer (TPE) specimen used for interior and exterior materials of a car. After the UV irradiation, the black sample surface was changed to gray. Materials on the aged sample were collected and analyzed using GC/MS, but significant materials were not found. Lots of small cracks were found on the aged specimen surface. Whitening phenomenon of the aged sample disappeared by brushing or searing with a fire on the aged surface. After brushing or searing with a fire, small cracks on the surface vanished. Samples before and after the aging, and the treated samples with brush or fire were analyzed using image analyzer, SEM, EDX, and ATR and the results were compared. The vanished whitening phenomenon by brushing or searing was explained with filling the small cracks by polypropylene of TPE.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.15 no.2
• /
• pp.211-218
• /
• 2020

The radio wave propagation characteristics of the transmitter and receiver position change in the indoor environment were predicted through simulation, then the results obtained through the transmission loss measurement were compared and analyzed with the simulation results. The conference room was chosen as the environment for measuring transmission loss, and the radio transmission characteristics of the two environments were compared by selecting the exhibition hall without interior decorations and fixtures. In each indoor environment, the position of the transmitter chose two cases. One located in the center of the front wall and the other in the center of the side wall, and the position of the receiver moved along the centerline of the conference room and the side wall, measuring the receiving power. For each change in transmitter-receiver position, received power of 3GHz and 6GHz band were measured and compared with the simulation forecast results. The changes in received power at each receiving point were analyzed according to the location of the transmitter and the frequency band variation.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.39 no.3
• /
• pp.337-342
• /
• 2010

The principal objective of this study was to compare and analyze the qualitative properties of MLT (mulberry leaf tea) and FMLT (fermented mulberry leaf tea) on the basis of the anti-cancer and anti-allergy activities of various extracts. The inhibitory effect against S-180 solid cancer in vivo were measured as 16.67% for FMLT and 17.78% for MLT. When the anti-allergy effects of the extracts of MLT and FMLT were evaluated, the hot water extract was shown to block histamine secretion more effectively than the ethanol extract for both groups. Furthermore, when the levels of the inflammatory cytokine of HMC-1 were measured, the ethanol extract was found to inhibit the inflammatory cytokine more effectively than the hot water extract, and the FMLT group was more effective than the MLT group.

• Management & Information Systems Review
• /
• v.31 no.3
• /
• pp.249-270
• /
• 2012

The purposes of this research are suggesting the needs of further studies about human brand by analysing the antecedents and consequents of brand attachments to celebrities in Korean Wave and marketing implications. In especially, this study uses attachment as a one of important marketing performance factor that may be a appropriate word in person to person relations. Research conclusions show the trust is more important factor to brand attachment than competence and self congruity. And there is no direct effect of competence to brand attachment. This is partially because emotional evaluation of consumers is much important than rational evaluation when they are making relationships with celebrities. Second, as similar with past studies, higher attachments lead to higher buying intention toward products that celebrities endorse, next entertainment products they record or play, extension products, and country image.

• Journal of the Korea Society of Computer and Information
• /
• v.12 no.5
• /
• pp.191-202
• /
• 2007

The purpose of this study is to examine the effect of Web site usability on trust, satisfaction, and repurchase intention in Internet shopping malls. The Web site usability construct consists of the factors such as contents, ease of use, navigation, and interactivity. In order to accomplish the purpose of this study, a research model was established and it suggests that the Web site usability, through the mediation of trust and satisfaction, eventually affect the repurchase intention of online customers in Internet shopping malls. The results of the study show that Web site usability has statistically significant effect on the repurchase intention of online customers and this effect is mediated by satisfaction. This research confirms the importance of usability construct in designing Web sites and understanding the use of Web sites. Implications of these findings are discussed for researchers and practitioners.