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통신서비스의 늦은 수요 확산 현상에 관한 연구 : Fax 서비스를 중심으로 Focused on the Fax Markets
임병락,최문기,박명철 한국경영과학회 2002 한국경영과학회지 Vol.27 No.2
Telecommunication services are distinctive in that their adoptions are influenced by network effect resulting in 'the late take-off phenomenon' and the 'critical mass' problem. In this paper we examined, so called, 'the late take-off phenomenon' in the diffusion process of telecommunication services. We compared the parameters of the diffusion process of consumer durables with those of fax services in the US and Korea. By analyzing the parameters of a new diffusion model based on the threshold model proposed by Markus, we found that 'the late take-off phenomenon' resulted from the low heterogeneity of the threshold distribution for the potential adopters. A simulation approach was proposed for the theoretical implication of the 'critical mass' problem in the start-up telecommunications services.
Byeong Cheol Min,Bon Wook Koo,Ki Seob Gwak,Hwan Myeong Yeo,Joon Weon Choi,In Gyu Choi 한국목재공학회 2011 목재공학 Vol.39 No.2
In this study, dilute acid pretreatment of Liriodendron tulipifera was performed for enzymatic hydrolysis. As the pretreatment temperature was increased, enzymatic hydrolysis and enzyme adsorption yield also increased. The highest enzymatic hydrolysis yield was 57% (gig) and enzyme adsorption was 44% (gig). Enzymatic hydrolysis yield was determined with weight loss of pretreated biomass by enzyme, and enzyme adsorption was a percentage of enzyme weight attaching on pretreated biomass compared with input enzyme weight. When L. tulipifera was pretreated with 1% sulfuric acid at 160℃ for 5 min., hemi-cellulose was significantly removed in pretreatment, but the lignin contents were constant. Other changes in surface morphology were detected on biomass pretreated at 160℃ by a field emission scanning electron microscope (FESEM). A large number of spherical shapes known as lignin droplets were observed over the entire biomass surface after pretreatment. Hemicellulose removal and morphological changes improved enzyme accessibility to cellulose by increasing cellulose exposure to enzyme. It is thus evidence that enzyme adsorption is a significant factor to understand pretreatment effectiveness.
Choi, Byeong Cheol,Jeong, Youn Kwae,Sone, Chang Soo,Yoon, Byeong Nam 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
Since a basestation transceiver subsystem(BTS) is located far(over several kilometers) from a base station controller (BSC) in code division multiple access(CDMA) mobile communication network, a trunk is used for transmission path between them. Therefore, the data transmission rate is limited to the speed of 1.544 Mbps(for T1) or 2.048 Mbps(for E1). So it is desirble to configure multiple links in order to reduce queue delay for the heavy traffic. In the case of link failure, it is necessary to reconfigure links in order to maintain the on-going mobile call service. In this paper, we propose a reconfiguration method based upon a self-routing applied to the interconnection network in the BSC and the BTS. The method includes the case of not only link failure but also link recovery. The proposed method is simply achieved by the bit modification of bridge link identification(ID) in the address field of frames for routing. We also show the traffic distribution over the available links as the number of failed links varies.