Judul: Penyelesaian VRPSDP Menggunakan Algoritme Kunang-Kunang
Abstrak: Penyelesaian masalah distribusi Aqua galon termasuk dalam pengaplikasian kompleks Vehicle Routing Problem with Simultaneos Delivery and Pickup (VRPSDP). VRPSDP dapat diselesaikan dengan metode eksak, heuristik atau meta-heuristik. Algoritme kunang-kunang merupakan salah satu algoritma meta heuristik yang terinspirasi oleh perilaku dan cara komunikasi serangga kunang kunang dengan melalui beberapa langkah yaitu membandingkan intensitas cahaya, menghitung tingkat daya tarik serta pergerakan, dan melakukan mutasi pembalikan. Metode algoritme kunang-kunang dalam penelitian ini digunakan untuk mencari solusi optimal dalam menyelesaikan permasalahan tersebut. Hasil penelitian menunjukkan bahwa Algoritme kunang-kunang mampu memberikan solusi yang mendekati optimal dalam waktu yang relatif lebih singkat dibanding metode eksak., Solving the Aqua gallon distribution problem is included in the complex application of the Vehicle Routing Problem with Simultaneous Delivery and Pickup (VRPSDP). VRPSDP can be solved by exact, heuristic, or meta-heuristic methods. The Firefly Algorithm is a meta-heuristic algorithm inspired by the behavior and way of communication of firefly insects by going through several stages, namely compare the light intensity, calculate the level of attraction and movement, and make a reversal mutation. The Firefly Algorithm method in this study is used to find optimal solutions to solve the problem. The results of this research show that the Firefly Algorithm can provide a solution that is close to optimal in a relatively short time compared to the exact method.
Keyword: distribution, firefly algorithm, vehicle routing problem, VRPSDP

Judul: Penyelesaian Vehicle Routing Problem pada Pendistribusian Sayuran Dataran Tinggi Menggunakan Algoritme Genetika (Studi Kasus PT Saung Mirwan)
Abstrak: Vehicle routing problem (VRP) is an important issue on a transportation system that aims at minimizing the total vehicle mileage to reduce vehicle operating cost to a minimum. Vehicle routing problem belongs to the class of non-polynomial hard (NP-hard), which generally uses a heuristic approach to find a solution. In this time, Vehicle routing problem resolution will be applied to the distribution of highland vegetables from PT. Saung Mirwan as the vegetable distribution center. The problems that often arise in the distribution of highland plain vegetables is to how minimize the total of transportation costs without sacrificing the goal completion time to reduce the risk of the decline in the quality of vegetables during the trip. Issues will become increasingly complex if the vehicle routing problem is flexible to changes that occur in the limit or the value of decision variables. The problems encountered in this case include heterogeneous multi fleet VRP, single source, single trip, and multi-product. Therefore, this research used genetic algorithm optimization method (GA) to solve the problem. Genetic algorithm is one of the heuristic methods, which is analogous to the process of evolution by natural selection phase, crossover and mutation. In this paper a simulation is performed by searching the optimum solution to the location of the distribution as the destination points. Optimum solutions are obtained in the form of division of highland vegetable distribution channels that meet the existing constraints. As a solution, there was reduction of the distribution time of about 1 hour 58 minutes or an increase in time efficiency by approximately 32.22% and a reduction of the fleet utilization by 1 fleet or an increase of fleet efficiency by 14.28%.
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Judul: Karakteristik Piezoelektrik Film LaxSr₁-xTiO3 di atas Substrat TCO
Abstrak: Studi material perovskite SrTiO3 sudah banyak dilakukan dan menunjukkan sifat feroelektrik, piezoelektrik, kuantum paraelektrik dan superkonduktor yang baik. Dengan penambahan dopant La2O3 diduga menambah performa sifat piezo dan karakteristik lainnya. Karakteristik film LaxSr₁-xTiO3 (LST) dengan variasi x= 0, 0.02, 0.04, 0.06 terbentuk pada suhu annealing 550 oC di atas substrat TCO melalui metode (Chemical Solution Deposition) CSD dan spin coating dengan 700 rpm pada kondisi suhu ruang dan tekanan atmosfer standar. Hasil menunjukkan, semakin banyak pendadah La maka nilai ketebalan film, ukuran rerata kristalit, parameter kisi, transmitansi, nilai konduktivitas (maksimum 589.7 S/cm pada sampel x=0.04 di frekuensi 10 Hz), nilai konstanta tegangan (c) dan muatan (d) piezo semakin meningkat. Dinamika bentuk grafik nilai tegangan (V) dan konstanta regangan mekanik (s) nampak mirip. Nilai V mencapai 0.127 V untuk x=0.06 (beban 50 g). Nilai maksimum c, d, s masing-masing mencapai 20.07 Vm/N, 1.14x10-8 C/N, 13642.71. Nilai band gap untuk x=0, 0.02, 0.04, 0.06 masing-masing 3.21 eV, 3.1 eV, 2.6 eV, 2.4 eV. La2O3 menambah performa sifat piezo, sehingga LST berpotensi sebagai sensor tekanan.
Keyword: CSD method, La2O3, LaxSr1-xTiO3, piezoelectric, TCO