This paper compared the output limits value of the Korean weak electric field strength wireless device in the 58kHz band with the standard values of foreign countries. Through this, the study confirmed that the Korean regulation was lower by about 50dB than those of the USA or Europe. In order to prove this, the study measured outputs by entrusting the 58kHz EAS system to two measuring companies. As a result of these measurements, electric field strengths were shown to be 112dB㎶/m and 108dB㎶/m respectively, and these values were confirmed to exceed the current Korean standard of 102.7dB㎶/m. Accordingly, it is deemed necessary to review the specifications of the Korean standard in the 58kHz band.
In this study, after applying the NHPP Rayleigh distribution model and the NHPP Erlang distribution model which are widely used in the field of software reliability together with the Goel-Okumoto basic model to the software development cost model, the attributes of cost were compared and analyzed. For this, software failure time data was used, parametric estimation was applied to the maximum likelihood estimation method, and nonlinear equations were calculated using the bisection method. As a result, it was confirmed that the Rayleigh distribution development model is the best efficient model because it has a lower software development cost and faster software release point than proposed other models. Through this study, the software development cost attributes of the Rayleigh model and the Erlang model without the existing research examples were newly analyzed. Also, we were able to present software developers and operators with the necessary prior information to predict the economic software development cost and the optimal release time.
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