• Energy Research
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Based on the survey that conducted on 33 respondents from the Palembang peoples and non-Palembang peoples, got the result that state, most respondents state they had trouble to deciding which restaurant to go to when visiting Palembang and most respondents need 20 to 60 minutes to determine which restaurant that they want to order the food in Palembang area. Therefore, this study will construct a restaurant recommendation system based on the Palembang region and implementing the Weighted Product method and also adding window maps features. This study aims to assist Palembang and non-Palembang users to choosing system-recommended restaurants in Palembang. The result of this study shows that the recommendation system has successful outcomes in helping the users with great overall feedback showing a high satisfaction level of 89.93%.

Pure sine wave transformers are very important nowadays when it comes to using ds power sources for both low and high-power applications. These inverters not only increase the efficiency of the power system but also prevent electrical components from damaging. Much work has been done in the field of pure sine wave inverter but for a waveform with low number of harmonics along with high efficiency is still an open challenge. There are techniques available to do this, but the need to adapt to a solution that is easy to implement as well as specifically for low energy applications. In this paper, a multi-vibration technique is used to generate a square wave which is then split into two square waves of the same frequency by the 4017-decade counter to hold the H-bridge inverter. The output of the H-bridge inverter contains harmonics that are filtered using a low pass filter. Thus, we get a pure sin wave in the output.