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This paper is centered around concept-based navigation, a powerful hypermedia navigation model. Main ideas behind concept-based navigation model are concept-based indexing and student modeling. We introduce the idea of concept-based navigation and describe its implementation in InterBook, an authoring system for designing Web-based adaptive hypermedia. We also demonstrate a number of benefits o...
With the continuous expansion of application field UAV intelligent systems to GNSS-denied environments, existing navigation system can hardly meet low cost, high precision, and robustness in such conditions. Most used environments give up connection between map frame actual world frame, making them impossible apply practice. Therefore, this paper proposes a Lidar based on global ArUco, which is...
The state of insecurity occasioned by fraudulent practices in Africa has been of concern economically, both at home and abroad. In this paper, we propose ways to mitigate this problem, using Nigeria as a case study. Based on surveys in West Africa, the paper examines the security situation in the continent and its mutual impacts with computerisation, miniaturisation and Location-Based Authentic...
The rapid emergence of GPS enabled devices, sensors and mobile equipment in commercial as well as government organizations has led to considerable research in timeand location-based access control schemes. Location-based access policies enhance the security of an application by restricting access to an object only from specified locations. On the other hand, temporal constraints provide granula...
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