Current Issue : October - December Volume : 2012 Issue Number : 4 Articles : 3 Articles
The aim of this study is to examine the relationship between media usage of managers and communication\r\nsatisfaction in Small and Medium tourism Enterprises. A conceptual model that hypothesizes the managers prefer to\r\nuse media that are high in richness, and media usage will affect communication satisfaction in the firms, is tested. In\r\naddition, the model portrayed age factor as the moderating variable in manager�s communication satisfaction in firms.\r\nThe data from 78 tourism managers was used to test the model on seven popular media in use. It was found that\r\nthere are differences in the media usage and communication satisfaction between the media that are high in richness\r\nand media that are low in richness. The findings suggest that the model is plausible in explaining how different factors\r\ncombine to affect the satisfaction of managers with the new generation of communication technologies. The results\r\nalso show that Age plays a moderator role for some of the investigated media....
The inclusion of multimedia content in different web-based services has increased\r\nsignificantly. Through an extensive subjective testing campaign, we analyse the\r\nquality of experience concerning video transmissions associated to these types of\r\nservices when accessed from mobile devices and mobile Internet connections.\r\nContrary to traditional normalised quality assessment studies, we point out the\r\nservice context as a key aspect in quality assessments. Specifically, we analyse the\r\nimpact of the duration of the test material on quality assessments. We find out that\r\ntolerance to visual degradations is higher in the specific context of use compared to\r\nwhen using standardised methodologies for quality assessment, which has a\r\nsignificant impact in terms of commercial service acceptability....
Recently, many research works have been focused on the fiber optic devices for optical communication\r\nsystems. One of the main interests is on the optical amplifiers to boost a weak signal in the\r\ncommunication systems. In order to overcome the limitations imposed by electrical regeneration, a\r\nmeans of optical amplification was sought. The competing technology emerged: the first was Raman\r\namplification. One reason was that the optical pump powers required for Raman amplification were\r\nsignificantly higher than that for Erbium doped fiber amplifier (EDFA), and the pump laser technology\r\ncould not reliably deliver the required powers. However, with the improvement of pump laser\r\ntechnology Raman amplification is now an important means of expanding span transmission reach and\r\ncapacity. We have deeply studied an analytical model for optical distributed Raman amplifiers (ODRAs)\r\nin the transmission signal power and pump power within Raman amplification technique in co-pumped,\r\ncounter-pumped, and bi-directional pumping direction configurations through different types of fiber\r\ncable media. The validity of this model was confirmed by using experimental data and numerical\r\nsimulations....
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