A Long-Term Rate Scheduling Framework for Bulk Data Multicast Dissemination in Hybrid Heterogeneous Satellite-Terrestrial Networks

We study a problem of long-term rate control for multicasting bulk data to heterogeneous receivers through hybrid satellite-terrestrial networks. By setting one of the control parameters called the {em 'knob'}, our proposed multicast rate control systems can trade off between multicast bandwidth requirement, which is the administrative issue, and reception latency, which is the users' satisfaction issue. Through a proactive use of the forward error correction (FEC) in the form of Reed-Solomon erasure (RSE) correcting codes, our proposed multicast rate control can also probabilistically guarantee reception reliability. In this dissertation, there are four contributions. One, our real experiments on a hybrid satellite-terrestrial internet channel that result in our proposed Gaussian approximation approach. Two, our proposed end-to-end version of the multicast rate control system which utilizes the Gaussian approximation approach. Three, our study on the issues of multicast traffic's co-existence with terrestrial TCP background traffic. Four, our proposed two-staged version of the multicast rate control system which also utilizes the Gaussian approximation approach and allows significantly improved scalability. We validate our proposed systems through simulations, some of which are trace-driven using real satellite traffic traces. We have found our proposed mechanisms to be very effective.There are a variety of applications for our proposed multicast rate control systems. Some examples include: a military application where commands or strategic information need to be disseminated at different priorities, a financial application where a faster access to certain key information can make a difference in profitability, and a news application where news-related contents such as images, weather, headlines are to be disseminated based on their urgency.Keywords: satellite multicast, reliable multicast, forward error correction (FEC), multicast rate control, Gaussian approximatio

On Satellite Multicast to Heterogeneous Receivers

We propose a framework for single-source, satellite-based multicast disseminationof bulk files. The framework trades off between reception delay andbandwidth usage and coexists with terrestrial background networktraffic; specifically TCP traffic utilizing a short-termcongestion control mechanism.The framework consists of two major components: 1) a multicastrate scheduling mechanism that uses long-term, end-to-end multicast packet survival statisticsin order to deal with the bandwidth-delay trade-off issue, and 2) afair queueing algorithm that regulates the points where multicast traffic fromthe satellite meets terrestrial background traffic. We show throughsimulation the performance of this framework under a number ofscenarios.The research content in this material will appear in IEEE ICC 2001.</Center

Towards Industry 4.0: digital transformation of traditional safety shoes manufacturer in Thailand with a development of production tracking system

There are many digital transformation challenges going forward towards Industry 4.0 in Thailand, especially for the traditional manufacturing firms that have been operating without digital technologies. The paper presents a case study of a safety shoe manufacturer, CPL Group Public Company Limited, adopting digital technologies to transform its production system of 40 years. It presents a conceptual design for production tracking based on IoT technologies for productivity improvement. This research uses inductive case study research design by interviewing executives and participating in the digital tracking development project using IoT sensors and image processing. The findings show the key success factors of digital transformation in manufacturing, strategies required for development, and the conceptual design of the production tracking system