Multi-layer Server Architecture for Distance Education Resynchronization
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Solution Overview
Problem
Existing distance education systems at multiple teaching sites face significant server load due to the need for extensive resynchronization of learning activities across a large number of students, which can lead to inefficiencies and performance issues when communication links are interrupted.
Innovation Solution
A multi-layer server arrangement where first-level and second-level servers relay activity commands and store application-specific data to enable localized resynchronization of student clients' learning activities with the teacher client's state upon link re-establishment, reducing the burden on central servers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a central server is used to distribute teaching materials and maintain synchronization for all students at multiple teaching sites, then real-time interaction and synchronization are achieved, but the server load increases significantly during resynchronization activities
Solution Approach 1:
The system divides the student population into multiple groups, each served by a dedicated second-level server at a specific teaching site. These second-level servers handle resynchronization for their respective student groups independently, segmenting the centralized resynchronization load into distributed local operations. This segmentation allows the first-level server to manage only inter-site synchronization while second-level servers handle intra-site resynchronization, significantly reducing the power consumption and load on central servers during recovery operations.
2Reliability
If resynchronization is performed centrally for all students when a communication link is restored, then synchronization is restored, but the time required for resynchronization increases due to the large number of students
Solution Approach 1:
The system divides the student population into multiple groups, each served by a dedicated second-level server at a specific teaching site. These second-level servers handle resynchronization for their respective student groups independently, segmenting the centralized resynchronization load into distributed local operations. This segmentation allows parallel resynchronization operations across multiple teaching sites, significantly reducing the total time required to restore synchronization for all students compared to sequential central processing.
Solution Approach 2:
The system performs preliminary actions by maintaining local copies of teaching materials and activity states at second-level servers and student clients before communication interruptions occur. When a link is restored, resynchronization involves exchanging only the differential changes or missing segments rather than transferring complete datasets. This preliminary caching and differential synchronization approach dramatically reduces the time required to restore synchronization after interruptions.
3Power
If a multi-layer server arrangement is implemented to reduce central server load, then server load is distributed, but the device complexity increases
Solution Approach 1:
The system divides the student population into multiple groups, each served by a dedicated second-level server at a specific teaching site. Each second-level server is responsible for a specific teaching site and its students, creating a clear hierarchical segmentation. This segmentation distributes the computational load while maintaining manageable complexity through well-defined roles: first-level servers handle inter-site coordination and global state management, while second-level servers handle local student management and intra-site synchronization.
Solution Approach 2:
Second-level servers act as intermediary components between the first-level central server and student clients. They receive teaching materials and activity commands from the first-level server, process them locally, and distribute them to student clients. During resynchronization, they mediate between the central server and local clients, handling the complexity of local state recovery while presenting a simplified interface to both the central server and students. This intermediary layer absorbs much of the operational complexity.
Data Source
AI summary
A method for delivering distance education for real clients, each either a teacher client or a student client, at multiple teaching sites and a system using the method are provided. A multi-layer arrangement is used to arrange computing servers to be one first-level server and one or more second-level servers each communicable with the first-level server. Each server serves real clients located in a pre-determined site. Furthermore, each server sets up a virtual client to execute the teacher client's activity command so as to locally generate application-specific data, which are then stored in this server. When a communication link to a student client is re-established after an activity interruption, resynchronization of the student client's learning-activity state with the teacher client's is regained based on the locally-generated application-specific data stored in the server that serves the student client without a need to burden other servers.