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Lee, Yoonjae The Korea Contents Association 2018 International Journal of Contents Vol.14 No.2
Although there have been studies regarding the influence of customer reviews on consumer decision making at online shopping sites, research on factors affecting the perceived customer review quality for online shopping sites is limited. This study posits that sociability, which is one of the environmental factors of an online shopping site, can affect the quality of customer reviews. Sociability is a key factor in building a collaborative environment online, but studies have been limited to applying sociability to customer reviews that are the result of a collaborative environment. This study expects that sociability affects the performance of online shopping sites through the perceived information quality of customer reviews, and customers' efficacy. More specifically this study investigates the structural relationship between sociability, self-efficacy, collective efficacy, and the perceived information quality of the reviews in an online shopping context, regarding the patronage intention of customers. This study was conducted using a survey of 361 college students. The structural equation model results indicate that user perception of sociability increases self-efficacy and collective efficacy. The improved efficacy enhances the perceived information quality of reviews for online shopping sites, which increases patronage intention of customers. This study found that online shopping sites require a platform for customers to engage in social interaction to enhance their customers' loyalty and lifetime value.
W-Disjoint Orthogonality Based Residual Acoustic Echo Cancellation for Hands-Free Communication
LEE, Yoonjae,KIM, Kihyeon,YOON, Jongsung,KO, Hanseok The Institute of Electronics, Information and Comm 2009 IEICE transactions on fundamentals of electronics, Vol.92 No.8
<P>A simple and novel residual acoustic echo cancellation method that employs binary masking is proposed to enhance the speech quality of hands-free communication in an automobile environment. In general, the W-disjoint orthogonality assumption is used for blind source separation using multi-microphones. However, in this Letter, it is utilized to mask the residual echo component in the time-frequency domain using a single microphone. The experimental results confirm the effectiveness of the proposed method in terms of the echo return loss enhancement and speech enhancement.</P>
Lee, Myung Hyun,Lee, Yoonjae,Oh, Jung Hwan,Kim, Young Gyu,Cho, Sung Ki,Kim, Jae Jeong The Electrochemical Society 2017 Journal of the Electrochemical Society Vol.164 No.14
<P>In this study, we synthesized a leveler that contained two quaternary ammonium groups attached to hexaethylene glycol. The leveler enabled void- and seam-less Cu filling of the microvia. The convection-dependent adsorption of the leveler was assessed through electrochemical analyses such as linear sweep voltammetry and chronoamperometry on a rotating disk electrode, and the effect of convection on the adsorption of the leveler is interpreted in terms of adsorption diffusion model. In a Koutecky-Levich plot, the enhanced adsorption and inhibition of the leveler at the higher convection was clearly observed with the synthesized leveler. (c) 2017 The Electrochemical Society.</P>
A Comparison Study on Reinforcement Behaviors of Functional Fillers in Nitrile Rubber Composites
( Yoonjae Seong ),( Harim Lee ),( Seonhong Kim ),( Chang Hyun Yun ),( Changsin Park ),( Changwoon Nah ),( Gi-bbeum Lee ) 한국고무학회 2020 엘라스토머 및 콤포지트 Vol.55 No.4
To investigate the reinforcing effects of functional fillers in nitrile rubber (NBR) materials, high-structure carbon black (HS45), coated calcium carbonate (C-CaCO<sub>3</sub>), silica (200MP), and multi-walled carbon nanotubes (MWCNTs) were used as functional filler, and carbon black (SRF) as a common filler were used for oil-resistant rubber. The curing and mechanical properties of HS45-, 200MP-, and MWCNT-filled NBR compounds were improved compared to those of the SRF-filled NBR compound. The reinforcing effect also increased with a decrease in the particle size of the fillers. The CCaCO<sub>3</sub>- filled NBR compound exhibited no reinforcing effect with increasing filler concentration because of their large primary particle size (2 μm). The reinforcing behavior based on 100% modulus of the functional filler based NBR compounds was compared by using several predictive equation models. The reinforcing behavior of the C-CaCO3-filled NBR compound was in accordance with the Smallwood-Einstein equation whereas the 200MP- and MWCNT-filled NBR compounds fitted well with the modified Guth-Gold (m-Guth-Gold) equation. The SRF- and HS45-filled NBR compounds exhibited reinforcing behavior in accordance with the Guth-Gold and m-Guth-Gold equations, respectively, at a low filler content. However, the values of reinforcement parameter (100M<sub>f</sub>/100M<sub>u</sub>) of the SRF- and HS45-filled NBR compounds were higher than those determined by the predictive equation model at a high filler content. Because the chains of SRF composed of spherical filler particles are similarly changed to rod-like filler particles embedded in a rubber matrix and the reinforcement parameter rapidly increased with a high content of HS45, the higher-structured filler. The reinforcing effectiveness of the functional fillers was numerically evaluated on the basis of the effectiveness index (φ<sub>SRF</sub>/φf) determined by the ratio of the volume fraction of the functional filler (φf) to that of the SRF filler (φSRF) at three unit of reinforcing parameter (100M<sub>f</sub>/ 100M<sub>u</sub>). On the basis of their effectiveness index, MWCNT-, 200MP-, and HS45-filled compounds showed higher reinforcing effectiveness of 420%, 70%, and 20% than that of SRF-filled compound, respectively whereas C-CaCO<sub>3</sub>-filled compound exhibited lower reinforcing effectiveness of -50% than that of SRF-filled compound.
LEE, Yoonjae,JEONG, Seokyeong,KO, Hanseok The Institute of Electronics, Information and Comm 2008 IEICE transactions on information and systems Vol.91 No.10
<P>A residual acoustic echo cancellation method that employs the masking property is proposed to enhance the speech quality of hands-free communication devices in an automobile environment. The conventional masking property is employed for speech enhancement using the masking threshold of the desired clean speech signal. In this Letter, either the near-end speech or residual noise is selected as the desired signal according to the double-talk detector. Then, the residual echo signal is masked by the desired signal (masker). Experiments confirm the effectiveness of the proposed method by deriving the echo return loss enhancement and by examining speech waveforms and spectrograms.</P>
기업용 하이브리드 애플리케이션 보안 위협 요소 및 대응방안 연구
이윤재 ( Yoonjae Lee ),오준석 ( Junseok Oh ),김용원 ( Yongwon Kim ),이봉규 ( Bong Gyou Lee ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2
본 연구의 목적은 차세대 MEAP 환경에서의 보안 평가 모델을 제시하는 것이다. 기업용 애플리케이션 개발환경은 PES 및 MEAP을 거쳐 완벽한 OSMP구현을 위한 HTML5 환경으로 발전하고 있다. 이와 더불어 보안의 위협도 증대되고 있으나, HTML5 환경에서의 보안에 대한 연구는 미흡한 실정이다. 이러한 문제에 대비하기 위해서는 기존 개발환경의 보안 특징을 살펴볼 필요가 있다. 본 연구에서는 보안위협요소를 Back-End System, Client, Developer, OS 4가지로 도출한 후, 이에 해당하는 보안 위협 문제들을 살펴보고 보안 평가 모델을 제시하였다. 본 모델은 단계별 보안이슈를 포함하고 있으며, 향후 HTML5 시대에 논의될 보안 이슈의 방향성을 제시한다는데 그 의미가 있다. 따라서 본 연구는 기업형 하이브리드 애플리케이션 개발을 준비하는 기업 및 연구자에게 시사점을 제공할 것으로 기대된다.