Judul: Julia as an Innovative Programming Language in Numerical Computing
Abstrak: Julia memadukan keahlian dari beragam bidang ilmu komputer dan ilmu komputasi untuk menciptakan pendekatan baru untuk komputasi numerik. Penelitian ini bertujuan untuk memperkenalkan Julia sebagai bahasa pemrograman yang dapat menyelesaikan permasalahan matematika khususnya dalam komputasi numerik kepada masyarakat. Komputasi pada Julia dirancang sedemekian rupa agar mudah dan cepat, serta mematahkan asumsi bahwa bahasa pemrograman dinamis (bahasa pemrograman tingkat tinggi) harus lambat. Sintaksi yang serupa antara Julia dengan beberapa bahasa pemrograman seperti Matlab dan Octave memudahkan pengguna untuk bertransisi. Vektorisasi pada Julia tidak menjadi prasyarat dalam hal kinerja. Multiple dispatch pada Julia memungkinkan pengguna untuk menulis fungsi beberapa kali dengan types yang berbeda. Julia didukung dengan paralelisme., Julia combines the expertise of from various field of computer science and computational science to create a new approach to numerical computing. The purpose of this research is to introduce Julia as a programming language that can solve mathematical problems, especially in numerical computing for community. Computing on Julia is designed in such a way as to be easy and fast, and break the assumption that dynamic programming languages (high-level programming languages) must be slow. Julia has similar syntax with several programming languages such as Matlab and Octave. In Julia, vectorization is not prerequisite in term of performance. In Julia, multiple dispatch allows users to write functions multiple times with different types. Julia support parallelism.
Keyword: Julia, multiple dispatch, numerical computing, parallelism, programming languange, vectorization

Judul: Formulasi Masalah Puzzle Sudoku Menggunakan Binary Integer Linear Programming (BILP) serta Implementasinya pada Julia, Python dan Minizinc
Abstrak: Sudoku merupakan permainan teka-teki angka yang populer di berbagai kalangan. Dalam matematika, Sudoku dapat dimodelkan sebagai masalah pemrograman linear khususnya masalah Binary Integer Linear Programming (BILP). Penyelesaian Sudoku menggunakan BILP cukup sulit karena membutuhkan banyak iterasi untuk itu perlu bantuan software. Penelitian ini bertujuan untuk menganalisis permasalahan Sudoku menggunakan formulasi pemrograman linear integer 0-1 dan mengimplementasikan permasalahan tersebut menggunakan package JuMP pada Julia serta membandingkan efisiensinya berdasarkan waktu komputasi pada Python dan MiniZinc. Hasil implementasi Sudoku pada Julia, Python dan MiniZinc menunjukkan bahwa bahasa pemrograman Julia memiliki performa yang lebih baik dibandingkan Python dan MiniZinc berdasarkan waktu komputasi., Sudoku is a number puzzle game that is popular in various circles. In mathematics, Sudoku can be modeled as a linear programming problem, especially the Binary Integer Linear Programming (BILP) problem. Solving Sudoku using BILP is quite difficult because it requires many iterations for that it requires software assistance. This study aims to analyze the Sudoku problem using the 0-1 integer linear programming formulation and implement the problem using the JUMP package on Julia and compare its efficiency based on computational time in Python and MiniZinc. The results of implementing Sudoku on Julia, Python and MiniZinc show that the implement on Julia programming language has less computational time than Python and MiniZinc.
Keyword: Julia, MiniZinc, Linear Programming, Python, Sudoku

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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