Judul: Penjadwalan Pengajaran dengan Integer Linear Programming: Studi Kasus di MTS YPI Pulosari Garut
Abstrak: Penjadwalan merupakan salah satu masalah yang dihadapi oleh lembaga pendidikan seperti sekolah Madrasah Tsanawiyah (MTs). Masalah penjadwalan dapat dimodelkan ke dalam integer linear programming. Tujuan dari pemodelan ini ialah memodelkan penjadwalan mata pelajaran berdasarkan tingkat ketertarikan guru terhadap periode waktu dengan integer linear programming dan menyelesaikannya dengan LINGO 11.0. Pada langkah akhir akan dilakukan pengimplementasian model untuk masalah penjadwalan mata pelajaran di MTs YPI Pulosari Garut. Tingkat ketertarikan guru dikelompokkan ke dalam tiga bagian yaitu sangat suka, suka, dan tidak suka.
Keyword: scheduling, integer linear programming, MTs YPI Pulosari

Judul: Penjadwalan Kegiatan Mengajar Bimbingan Belajar Menggunakan Integer Linear Programming: Studi Kasus Bintang Pelajar Cikarang
Abstrak: Penjadwalan menjadi salah satu permasalahan yang sering dihadapi dalam penugasan suatu organisasi termasuk lembaga pendidikan, salah satunya yaitu bimbingan belajar. Penjadwalan ini melibatkan kombinasi antara banyaknya tenaga pengajar, mata pelajaran, kelompok belajar, sesi belajar, dan ketersediaan ruangan. Tujuan dari penelitian ini adalah memodelkan masalah penjadwalan dengan meminimumkan bobot sesi belajar setiap kelompok lalu mengimplementasikan model tersebut pada masalah penjadwalan kegiatan mengajar di Lembaga Bimbingan Belajar Bintang Pelajar Cikarang. Masalah tersebut diselesaikan menggunakan integer linear programming. Dengan bantuan software Lingo 19.0 diperoleh solusi optimal berupa jadwal kegiatan mengajar untuk periode waktu satu bulan yang memenuhi seluruh kendala., Scheduling is one of the problems faced in the assignment of an organization including educational institutions, one of which is tutoring. This scheduling involves the number of teaching staff, subjects, study groups, study sessions, and room availability. The purpose of this study is to model the scheduling problem by minimizing the weight of each group's study sessions and then implement the model on the scheduling teaching activities at Tutoring Institutions Bintang Pelajar Cikarang. That problem was solved using the integer linear programming method. With the help of Lingo 19.0 software, an optimal solution is obtained in the form of a teaching activity schedule for one month that satisfies all constraints.
Keyword: Bintang Pelajar Cikarang, integer linear programming, learning session weight, scheduling, tutoring institutioins

Judul: Extraction and Characteristic of Collagen and Nanoparticle Collagen from the Skin of Stingray Fish (Pastinachus solocirostris) as Ingredient of Cosmetics.
Abstrak: Isolation of collagen from the skin of stingray fish (Pastinachus solocirostris) has been successfully conducted with three stages: first soaked in 0.05 M NaOH with a sample/solution ratio of 1:10 (w/v) for 6 hour, second soaked in 0.1 M acetic acid with a sample/solution ratio of 1:6 (w/v) for 2 hour, and third extraction with destilated water at temperature 40 C for 2 hour with a yield of 14.475 % (wet base). Nanoparticle collagen was made with desolvation method using etanol as a desolvating agent with a collagen solution/etanol ratio of 1:1. Yield of nanoparticle collagen was 9.64% (wet base) with particle size of 185.24 nm. Collagen and nanoparticle collagen is in the form of white powder with whiteness degree 72.48% and 60.03%, respectively. Protein is the major component in collagen and nanoparticle collagen (86.97% and 86.18%) with trace amount of ash (0.17% and 0.13%) and fat (0.19% and 0.25%), respectively. Based on sodium dodecyl sulfate-polyacrylamide gel electrophoresis patterns, amino acid composition, and fourier transform infrared (FTIR) spectra of both collagen and nanoparticle collagen were characterized as type I collagens. Nanostructural analysis of collagen and nanoparticle collagen by Scanning Electron Microscopy (SEM) shows that both were separate aggregates. Other characteristics of collagen and nanoparticle collagen were: Tmax of 165.88 C and 156.63 C; Viscosity 292.33 cP dan 110 cP; pH 5.00 dan 4.93; respectively. Collagen has highest solubility at pH 7 and the isoelectric point at pH 6, 9, and 10. Therefore, nanoparticle collagen has highest solubility at pH 3 dan and the isoelectric point at pH 6. Collagen and nanoparticle collagen from skin of stingray fish (Pastinachus solocirostris) has a characteristic for a potential use as a cosmetic ingredient.
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