This study investigated the use of a free GeoGebra application, where the ability of a GeoGebra software application had the potential to simplify and help the teaching and learning process in the informatics management study program, Medan State Polytechnic. The focus of this research was the incorporation of conventional method-based teaching, namely using the assistance of writing instruments such as pencils, pens, and paper when describing the Venn diagram in mathematical logic courses with the help of the GeoGebra application which made it easier for students to drew circles and determine the slices and combinations on the Venn diagram. The resulted of this study were obtained from the scores of student assignments and the results of interviews conducted online with the number of respondents consisting of 44 students who successfully uploaded assignments through the SIPADI application. The value analysis obtained was compiled into tables then processed using the SPSS application using the pair test and linearity test. Based on the output obtained, it was known that the GeoGebra value obtained the average value of learning outcomes or the mean of 75.9773, while for the average learning outcomes using conventional methods or the mean of 68.9091. The number of respondents or students who took the test amounted to 44 people, Std. Deviation for GeoGebra method was 5.800092 and conventional method was 5.56909, and Std. Error Means. Based on the results of descriptive statistical tests, the average value of the GeoGebra method > conventional method was 75.9773> 68.9091, so descriptively there was an average difference between the GeoGebra method and the conventional method.

The increasing use of electrical energy in society in 2020 is closely related to the pandemic problem that is occurring. Increased household activity causes a surge in energy in the household sector. This increase in energy consumption needs to be balanced by providing exposure to the utilization of existing electrical equipment in households. The lighting system give an important role in energy consumption in the household sector. The dedication carried out is by providing knowledge on the use of the lighting system, the rules in PUIL 2000 and the calculation of the Basic Electricity Tariff (TDL) in 2020. Submission of this will certainly increase public understanding of energy savings so that it can contribute to overcoming the problem of electricity devisit occur.

Pencemaran udara menjadi salah satu hal yang sedang banyak dibicarakan akhir-akhir ini. Salah satu cara untuk mengurangi pencemaran udara adalah dengan melakukan efisiensi terhadap konsumsi energi. Penelitian ini akan berfokus pada penyelesaian job shop yang tidak hanya meminimumkan waktu penyelesaian pekerjaan akan tetapi juga konsumsi energi. Permasalahan tersebut akan diselesaikan dengan menggunakan Algoritma Hybrid yaitu gabungan metode Hybrid Genetika dan Simulated Annealing. Algoritma Simulated Annealing digunakan untuk mengembangkan pencarian lokal pada solusi yang sudah diproleh pada algoritma genetika.

ABSTRAKTelah dilaksanakan penelitian ZnO dan ZnO doping tembaga yang bertujuan untuk mengetahui sifat optik material tersebut meliputi nilai absorbansi dan celah pita energi. Penelitian ini diselesaikan dengan menggunakan metode liquid phase deposition atau kimia basah yang dilakukan dengan konsentrasi tembaga 0 dan 11%, selanjutnya dilakukan pemanasan pada microwave kemudian dikarakterisasi nilai absorbansi dan energi gap dengan spektrofotometri UV-VIS. Hasil yang diperoleh pada penelitian ini adalah ZnO:Cu 0% dan 11% memiliki serapan paling tinggi berada disekitar panjang gelombang 344 nm dan 358 nm, Setelah menentukan nilai absorbansinya kemudian menganalisis nilai celah pita energi dengan konsentrasi 0% dan 11% diperoleh nilai celah pita energi secara berurutan yaitu 3.37 eV dan 3.31 eV. Penambahan doping Tembaga mengakibatkan puncak absorbansi bergeser kearah panjang gelombang yang lebih besar. Sehingga dapat dikatakan bahwa bahwa ZnO:Cu baik 0% maupun 11% merupakan karakterisaasi bahan yang dapat mengabsorbsi cahaya UV. Kata kunci: semikonduktor; sifat optik; absorbansi; celah pita energi. ABSTRACTResearch has been carried out on copper doped ZnO and ZnO which aims to determine the optical properties of these materials including absorbance values and energy band gaps. This research was completed using the liquid phase deposition method or wet chemistry which was carried out with copper concentrations of 0 and 11%, then heating in the microwave and then characterizing the absorbance value and energy gap by spectrophotometry UV-VIS. The results obtained in this study are ZnO:Cu 0% and 11% have the highest absorption around the wavelengths of 344 and 358 nm. After determining the absorbance value, then analyzing the energy band gap value with a concentration of 0% and 11%, the energy band gap values obtained respectively are 3.37 eV and 3.31 Ev. The addition of copper doping causes the absorbance peak to shift towards a larger wavelength, So it can be said that ZnO:Cu both 0% and 11% is a characterization of materials that can absorb UV light. Keywords: semiconductors; optical properties; absorbance; energy gap.

Flexible Job Shop (FJSP) adalah pengembangan dari Job Shop dimana terdapat lebih dari satu mesin yang dapat memproses suatu pekerjaan. Due Windows adalah salah satu permasalahan terkait FJSP dimana terdapat interval waktu untuk penyelesaian pekerjaan. Tiap pekerjaan yang diselesaikan diluar interval waktu tersebut akan dikenai penalti. Dengan demikian fungsi tujuan adalah meminimukan penalti. Algoritma Genetika akan digunakan untuk memproleh  penjadwalan dengan penalti yang minimum.