A distributed virtual environment (DVE) is a software system that allows users in a network to interact with each other by sharing a common view of their states. As users are geographically distributed over large networks like the internet and the number of users increases, scalability is a key aspect to consider for real-time interaction. Various solutions have been proposed to improve the scalability in DVE systems but they are either focused on only specific aspects or customized to a target application. In this paper, we classify the approaches for improving scalability of DVE into five categories: communication architecture, interest management, concurrency control, data replication, and load distribution. We then propose a scalable network framework for DVEs, ATLAS. Incorporated with our various scalable schemes, ATLAS meets the scalability of a system as a whole. The integration experiences of ATLAS with several virtual reality systems ensure the versatility of the proposed solution.
In the lubrication oil of the machinery devices, metal wearing particles reflect the wearing state in real time. Therefore, lubrication oil wearing particles monitoring system can identify the health state of the machinery devices. Based on the three-coil inductive sensor, this paper proposes the monitoring system including the exciting circuit, the detection circuit, the MCU system circuit and the host PC software. Experimental result shows that the proposed monitoring system can captures the output signal of the metal wearing particle.
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