![]() ![]() ![]() The experimental results of the prototype show that the digital control scheme either for the converter or the wire feeder is applicable for all output current range. ![]() A welding machine prototype with capacity up to 400 amperes is built. To achieve constant arc length control, a triple closed loop control model including stick-out compensation, arc regulation and current control is presented to make arc length constant and welding stable during the whole process. As for the control of the DC/DC converter, peak current control is taken to suppress the over current across switches. inner loop of current regulation for wire feeding motor is proposed. Both control of the feeder and converter are implemented with each separated digital signal processor(DSP).To improve the stability performance and dynamic response of wire feeder, a digital control strategy consisting of outer loop of rotating speed regulation and. In this paper, development of a switch mode pulsed MIG welding machine composed of a wire feeder and DC/DC converter is described. As drawbacks, there's the considerable performance penalty caused by the emulation and the risk of executing harmful random instructions. The technique doesn't require the source code of the protected programs, and the user can select which programs to protect. However, the random instructions, generated by the unscrambling routine when working on the attack code, may turn to be valid and harmful instructions, but experimental results show that the probability is very low, even in such dense instruction set as the x86. Several attacks are tested against programs running over the prototype, and all of them are disrupted by the emulator. Injected binary code attacks are disrupted due to the instruction set incompatibility. ![]() RISE protects running programs individually using an unique random key for each program execution, scrambling code in the load time and. This work is a summary of the concepts, implementation description and results presented in (BAP+03) by Barrantes et al., where a prototype of a Randomized Instruction Set Emulator (RISE) is constructed modifying the Valgrind x86-to-x86 binary translator. ![]()
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