Judul: Penerapan Algoritme Genetika dalam Sistem Permainan Tebak Angka
Abstrak: The number guessing game is a modified game of mastermind created by Mordecai Meirowitz in 1970. The goal of the game is to guess a hidden sequence of numbers stored by others (human or computer) based on values obtained at each guess iteration. In this study, the game is applied into the system by using genetic algorithms, a method that has been successfully utilized to implement the mastermind game on the computer and get an effective solution for the game. Genetic algorithms work through a process of natural selection or commonly known as the evolutionary process, which will continue running until the system finds the optimal 4-digit series of numbers. The system is designed in order to guess those hidden numbers with minimal iterations using c++ programming language. The output of the program shows that the performance is determined by the first guess iteration.
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Judul: Application of Genetic Algorithms with Roulette Wheel, Binary Tournament, Elitist, and Replacement Methods in Profit Optimization
Abstrak: Perhitungan optimasi laba serta analisis yang tepat terhadap proses produksi diperlukan untuk memaksimalkan laba perusahaan. Permasalahan optimasi laba ini dapat diselesaikan dengan algoritma genetika. Terdapat banyak metode seleksi dalam algoritma genetika, 4 di antaranya ialah roulette wheel, binary tournament, elitist, dan replacement. Penelitian dilakukan untuk mencari metode seleksi terbaik berdasarkan rata-rata nilai fitness yang dihasilkan. Penelitian ini ditinjau berdasarkan tiga kasus yang berbeda dalam membandingkan empat metode seleksi yang diuji, kasus pertama menggunakan pop_size=10 dan N=10, kasus kedua menggunakan pop_size=25 dan N=10, dan kasus ketiga menggunakan pop_size=10 dan N=50. Ketiga kasus tersebut menggunakan parameter tetap yaitu cr=0,8 dan mr=0,1. Hasil dari penelitian ini didapatkan bahwa metode terbaik secara berturut-turut ialah metode replacement, roulette wheel, dan elitist. Sedangkan metode seleksi binary tournament dinilai kurang sesuai pada penelitian ini., Calculation of profit optimization as well as proper analysis of the production process are needed to maximize the company's profit. This profit optimization problem can be solved with genetic algorithms. There are many selection methods in genetic algorithms, four of which are roulette wheel, binary tournament, elitist, and replacement. The study was conducted to find the best selection method based on the average fitness value produced. This study was reviewed based on three different cases in comparing the four selection methods tested, the first case used pop_size=10 and N=10, the second case used pop_size=25 and N=10, and the third case used pop_size=10 and N=50. All three cases use fixed parameters, namely cr=0.8 and mr=0.1. The results of this study found that the best methods consecutively are replacement, roulette wheel, and elitist methods. Meanwhile, the binary tournament selection method was considered inappropriate in this study.
Keyword: binary tournament, elitist, genetic algorithm, replacement, roulette wheel

Judul: Penentuan Kondisi Proses Pemisahan Sitronelal dan Rhodinol dari Minyak Sereh Wangi dengan Distilasi Fraksinasi Vakum
Abstrak: Minyak sereh wangi merupakan salah satu minyak atsiri yang memiliki komponen utama sitronelal dan rhodinol. Komponen utama tersebut dapat dipisahkan dengan metode distilasi fraksinasi. Proses distilasi fraksinasi dengan alat dan kondisi proses berbeda berpengaruh terhadap proses pemisahan fraksi minyak sereh wangi. Oleh karena itu, perlu diketahui pengaruh suhu dan rasio refluks pada proses pemisahan sitronelal dan rhodinol minyak sereh wangi dari unit distilasi fraksinasi vakum kapasitas 7L yang telah di desain dengan spesifikasi tertentu. Proses pemisahan dilakukan pada tekanan 60 mmHg dengan umpan 5L dan dilanjutkan proses redistilasi fraksi kaya sitronelal dan rhodinol. Fraksi sitronelal dan rhodinol yang dihasilkan dilakukan analisis GC-MS untuk mengetahui konsentrasi masing-masing fraksi. Variasi refluks yang digunakan pada pemisahan sitronelal yaitu 12:4, 6:4, 6:2 dan 10:10. Suhu dan rasio refluks berpengaruh terhadap kemurnian fraksi. Kemurnian fraksi sitronelal tertinggi yang dihasilkan yaitu sebesar 50,55% dan fraksi rhodinol sebesar 37,09% pada rasio refluks 6:4. Proses redistilasi fraksi kaya sitronelal dan rhodinol menghasilkan konsentrasi senyawa sitronelal sebesar 42,72% dan senyawa rhodinol sebesar 32,51% dengan rasio refluks 10:10. Kemurnian sitronelal meningkat dan waktu proses lebih singkat dikarenakan pada suhu dan rasio refluks yang digunakan, alat bekerja lebih baik sehingga menghasilkan kemurnian lebih tinggi. Kata kunci: distilasi fraksinasi vakum, minyak sereh wangi, refluks, rhodinol, sitronelal, Citronella oil is one of the essential oils that has the main components of citronellal and rhodinol. The main components can be separated by fractional distillation method. Fractional distillation process with different tools and process conditions affect the separation process of citronella oil fraction. Therefore, it is necessary to know the effect of temperature and reflux ratio on the separation process of citronellal and rhodinol of citronella oil from a 7L capacity vacuum fractionation distillation unit which has been designed with certain specifications. The separation process was carried out at a pressure of 60 mmHg with 5L feed and continued with the redistillation process of the citronellal and rhodinol-rich fractions. The resulting citronellal and rhodinol fractions were analyzed by GC-MS to determine the concentration of each fraction. Reflux variations used in citronellal separation are 12:4, 6:4, 6:2 and 10:10. Temperature and reflux ratio affect the purity of the fraction. The highest purity of the citronellal fraction produced was 50.55% and the rhodinol fraction was 37.09% at a reflux ratio of 6:4. The redistillation process of citronellal and rhodinol-rich fractions resulted in a concentration of citronellal compounds of 42.72% and rhodinol compounds of 32.51% with a reflux ratio of 10:10. The purity of citronellal is increased and the processing time is shorter because at the temperature and reflux ratio used, the tool works better resulting in higher purity. Keywords: citronella oil, citronellal, rhodinol, reflux, vacuum fractional distillation
Keyword: distilasi fraksinasi vakum, minyak sereh wangi, refluks, rhodinol, sitronelal