Mobile Defense System Event Documentation via Dynamic Storage
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Solution Overview
Problem
Existing mobile defense systems lack reliable documentation of their use, particularly before the actuation of the device, which can hinder accountability and assessment of events leading to their deployment.
Innovation Solution
A mobile defense system with a camera that continuously records and saves images, deleting older data to maintain low memory usage, and switches to permanent storage upon actuation, storing images before and after the event, along with additional data like active substance status and position, for comprehensive documentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If images are continuously recorded and permanently stored, then documentation reliability is improved, but memory requirements and data management complexity increase
Solution Approach 1:
The system pre-loads and stores image data from a time period before the actual event (e.g., 10 seconds before actuation). This preliminary action ensures that contextual information leading up to the event is already available in memory when needed, without requiring continuous long-term storage of all historical data.
Solution Approach 2:
The system changes the storage parameter dynamically: data is stored with high retention (permanent storage) during and around the event period, but with low retention (overwritten after fixed time) for periods before and after the event. This parameter change optimizes memory usage by applying different storage policies to different time periods.
2Reliability
If all image data is permanently stored, then accountability is improved, but data management and processing time increase
Solution Approach 1:
The system extracts and permanently stores only the critical subset of data: images from a defined period before actuation, during actuation, and after actuation. Non-critical data (older images) is excluded from permanent storage and allowed to be overwritten, reducing data management burden while maintaining accountability for the essential event period.
Solution Approach 2:
The storage system dynamically changes retention parameters based on temporal proximity to the event. Data within the critical time window (before, during, and after actuation) receives permanent storage treatment, while data outside this window receives temporary storage treatment with automatic overwriting after a fixed duration.
3Reliability
If the camera is always switched on for documentation, then event coverage is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous operation, the camera system uses periodic action with different intensities: high-rate continuous recording during the critical event period (before, during, and after actuation), and lower-rate or stopped recording during non-critical periods. This periodic operation maintains event coverage while reducing overall energy consumption.
Data Source
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AI summary
A device (12) serves to deliver an active substance that temporarily incapacitates an attacker and/or repels an attacker. It comprises a delivery nozzle (14), an active substance reservoir (24), and an actuating device (20) for starting and stopping the delivery of the active substance. It is proposed that it includes a transmitting device (26) which, depending on an actuation of the actuating device (20) and/or a detected delivery of the active substance by the delivery nozzle (14), sends an electronic data signal indicating an actuation or delivery.