The indicator system is composed of several organisms that are closely linked, mutually constrained, and independent of each other. The establishment of the index system is the premise and basis for the evaluation study. In order to make the evaluation conclusions of the networked application of public safety video surveillance construction as scientific, objective and comprehensive as possible, the following principles should be followed in the construction of the evaluation index system:
1. Scientific
The construction of evaluation index system should be combined with theory and practice. The selection of evaluation indicators should be able to reflect the connotation and main content of the networking application of public safety video surveillance construction, and it should be able to accurately reflect the objective reality of video surveillance construction networking applications.
2. Systematic
The evaluation index system should be comprehensive, complete, and hierarchical, meaning should be clear and easy to understand. Each evaluation index is independent and connected with each other. It is logical and can describe the main features and status of the networked application of public safety video surveillance construction from multiple perspectives and levels.
3. Practicality
The evaluation index system should have a wide range of representativeness. It must consider the feasibility of index value measurement and data collection. It can comprehensively reflect the important role of public safety video surveillance construction networking application in the public security prevention and control system and the construction of smart cities. It is also necessary to consider the gradual progress of networking applications for video surveillance and construction, and to guide the development of video surveillance and networking applications.
4. Comparability
The evaluation index system should comprehensively consider the changes of time and space and their influence, and reasonably select relative indicators and absolute indicators, not only suitable for longitudinal comparison of different periods of a city, but also for horizontal comparison among different cities.
5. Forward-looking
It can predict the changes of the project environment in advance and propose adjustment measures in a timely manner. The proposed recommendations can effectively improve the level of decision-making, construction, management, and application of the project, and provide guidance and reference for planning, construction, and application of future projects.
The Knock Sensor is located on the engine block, cylinder head or intake manifold. This is because its function is to sense vibrations caused by engine knock or detonation. The PCM uses this signal to alter the ignition timing and prevent detonation. It will compare this information with its preset tables to identify a valid knock or ping. If a ping is sensed, it will retard the ignition timing to protect the engine from this damaging pre-ignition.
Knock Sensor
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