Judul: Penyelesaian Permainan Flow Colors dengan Meminimumkan Deviasi Panjang Tiap Jalur
Abstrak: Flow Colors is a puzzle game, where players must connect every pair of points of the same color with a pipe so that the pipes cover all the game areas with colors. Pipes with different colors should not be intersected/ overlapped. This problem can be modelled as a problem of making routes on a graph which is a modification of Traveling Salesman Problem (TSP). This study presents how to formulate puzzle of Flow Colors to minimize length deviation of the lines represented by the pipes by applying method of integer linear programming and solving it by using LINGO 11.0 computer software.
Keyword: Traveling Salesman Problem, puzzle Flow Colors, integer linear programming

Judul: Penjadwalan Produksi Flow Shop untuk Meminimumkan Makespan Menggunakan Integer Linear Programming
Abstrak: Penjadwalan produksi yang tepat diperlukan oleh suatu perusahaan agar proses produksi berjalan dengan efisien. Penjadwalan produksi dapat diklasifikasikan berdasarkan pola aliran proses produksi yang dimiliki oleh masingmasing perusahaan. Salah satu pola aliran proses produksi adalah flow shop, yaitu proses produksi yang sistem produksinya menggunakan lintasan produksi (production line) dan setiap job harus dikerjakan pada satu lintasan. Karya ilmiah ini memformulasikan masalah penjadwalan produksi sistem flow shop dengan meminimumkan waktu penyelesaian seluruh pekerjaan (makespan). Model selanjutnya diimplementasikan menggunakan bantuan software Lingo 11.0 pada masalah penjadwalan produksi 10 produk susu dengan menggunakan 2 mesin yang memiliki kecepatan berbeda. Hasil implementasi menggunakan komputer berprosesor 1,86 GHz dan RAM 2 GB diperoleh solusi optimum dalam waktu 15 jam 24 menit 57 detik.
Keyword: flow shop, makespan, integer linear programming

Judul: Durability of Specific Immunoglobulin (Ig) Y Againts Influenza and Covid-19 in Sunscreen
Abstrak: The benefit of specific immunoglobulin Y (Ig Y) as an active ingredient in personal care products such as sunscreen has not been properly studied. Our study aims to evaluate the reliability of specific IgY against influenza and the COVID-19 virus in a sample sunscreen product. Specific IgY influenza and COVID-19 viruses were inserted in the sample sunscreen at two concentrations of 0.1% and 0.25%. Three treatments were observed: control (C) sunscreen without IgY, treatment 1 (T1) sunscreen with 0.1% IgY, and treatment 2 (T2) sunscreen with 0.25% IgY. Organoleptic observations were carried out to monitor changes in aroma, color, and texture, and sunscreen sampling was done every week for 6 weeks. The durability of IgY was evaluated using an enzyme-linked immunosorbent assay (ELISA) and a neutralization assay. Organoleptic observation from weeks 1 to 6 showed consistency in its aroma, color, and texture. Enzyme-linked immunosorbent assay and neutralization assay (NA) results of the T1 and T2 groups showed negative results except for sample T1 at week 5, which showed a positive result in the Influenza A ELISA. Based on the results, it seems that IgY concentrations of 0.1% or 0.25% were not optimal. However, this negative result might be due to low concentration of the IgY and the presence of beeswax, which inhibits IgY and causes it to dissolve in distilled water, thus preventing it from being detected in the assay.
Keyword: Immunoglobulin Y, Sunscreen, Influenza, COVID-19, Biological Activity