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    What is the purpose of the multi-application test for COS savvy testing?

    Verify whether COS can prevent multiple applications from interfering with each other when rewriting files.

    What are the main aspects of the signal loss mechanism in the acoustic channel?

    There are two main aspects of the signal loss mechanism in the acoustic channel.
    On the one hand, the acoustic signal is lost at high frequency due to the viscous absorption of the liquid.
    On the other hand, molecular absorption caused by dissolved compounds such as boric acid and magnesium carbonate is the main cause of losses when transmitting low frequency underwater acoustic signals.
    In both types of losses, the attenuation of the signal varies with physical characteristics such as temperature, salinity, and pressure.

    What is the development of LED lighting technology?

    • The progress of domestic LED technology: it must undergo revolutionary changes, and efforts must be made from the following two aspects:
      1. Continuously improve the process;
      2. At the same time, develop new materials and improve product structure. The progress of foreign LED technology: At the same time, it meets the requirements of full-color display and low power consumption of portable products. These advanced LEDs include: (1) blue and green LEDs. (2) Novel four-dimensional LED. (3) New varieties of LED developed.

    What are the functions of the / and / XOR instructions?

    The AND/OR/XOR instruction AND/ORA/EOR performs a bitwise AND/OR/XOR logical operation on the contents of the accumulator A and the corresponding operand. Then store the operation result in A, and clear the flag bit V in the CCR register to 0 at the same time. Affects the N and Z flags, but has no effect on other flags.

    What is the photoconductive effect?

    Photoconductive effect (photoconductive effect) After the semiconductor material absorbs photons, the carrier concentration increases, thus resulting in a change in the electrical conductivity (resistivity) of the semiconductor material. This phenomenon is called the photoconductive effect.

    What is the purpose of the VPB crossover?

    • The VPB divider has two main purposes:
      1. Divide the processor clock (CCLK) so that the peripherals can work at a suitable speed.
      2. Reduce system power consumption.

    What are the characteristics of embedded systems?

    “Embeddability”, “Included Computer” and “Specialty”.

    What is the security and confidentiality of smart card communication?

    The communication security of smart card is the same as confidentiality and personal identification. It also belongs to the logical security category of smart cards.

    What is ARM?

    ARM (Advanced RISC Machines) is both the name of a company and a general term for a class of microprocessors.
    ARM is a well-known company in the microprocessor industry, and has designed a large number of high-performance, cheap, and low-energy RISC processors, related technologies and software. The technology is characterized by high performance, low cost and low energy consumption. Suitable for a variety of fields, such as embedded control, DSP and mobile applications.
    ARM is a company specializing in the design and development of chips based on RISC technology. As an intellectual property supplier, it is not directly engaged in chip production itself. Through the transfer of design licenses, the cooperative companies produce unique chips. The world’s major semiconductor manufacturers buy their designed ARM microprocessor cores from ARM. According to their different application fields, add appropriate peripheral circuits to form their own ARM microprocessor chips and enter the market.
    At present, dozens of major semiconductor companies around the world use ARM’s license. So even ARM technology gets more support from third-party tools, manufacturing, and software. It also reduces the cost of the entire system, making it easier for products to enter the market and be accepted by consumers.

    What is an angular velocity sensor?

    The angular velocity sensor is a sensor used to detect the rotational angular velocity of the vehicle body when turning. It is indispensable in new automotive technologies (VSC, VSA, VDC, ASC, etc.).


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