Broadband acoustic signals were transmitted during November 1994 from a 75-Hz source suspended near the depth of the sound-channel axis to a 700-m long vertical receiving array approximately 3250 km distant in the eastern North Pacific Ocean. The early part of the arrival pattern consists of raylike wave fronts that are resolvable, identifiable, and stable. The later part of the arrival pattern...

Optic flow fields provide rich information about the observer's self-motion. Besides estimation of the direction of self-motion human observers are also able to discriminate the travel distances of two self-motion simulations. Recent studies have shown that observers estimate the simulated ego velocity of the self-motion simulation and integrate it over time. Thus, observers use a 3-D percept o...

(Chalupsky et al. 2001, 2002) at the University of Southern California (USC) was to develop software agents to support human organizations. The project was quite successful with impressive prototypes and many papers on the research. In fact, DARPA, which funded the project, was so enthusiastic about the results that it asked us to deploy a version of the Elves for use at DARPA. The original app...

A surprising discovery has been made that in some cases the complex, highly scattered Lg wave is found to be similar for clusters of events. We analyze in detail a subset of 28 out of 90 events from the 1999 Xiuyan sequence. Cross correlations provide highly accurate differential travel-time measurements. Their error estimated from the internal consistency is about 7 msec. These travel-time dif...

This paper aims to introduce a new modelling approach that represents departure time, destination and travel mode choice under a unified framework. Through it, it is possible to overcome shortages of the traditional 4-step model associated with the lack of introducing actual travellers’ behaviours. This objective can be achieved through adopting discrete 3-level Nested Logit model that represen...

this study was performed in order to provide a strategic development plan for ecotourism in shahdad district of kerman province. thus cultural, historical and natural attractions of the region and its surrounding areas were studied and identified initially. by completing clawson questionnaire in the form of travel cost method (tcm), valuation and analysis of ecotourism demand index of the consi...

The use of the Internet for communicating and transacting with customers has been growing rapidly in the worldwide tourism industry. However, there is a large variation in the intensity of use of e-commerce in the travel and tourism industry. While the Internet usage varies across countries, even within a country there are large variations amongst enterprises. These variations are mainly due to...