Judul: Distance-Minimizing Classroom Allocation by Considering Room Capacity and Facilities Using Integer Linear Programming
Abstrak: Penjadwalan perkuliahan dipengaruhi oleh beberapa faktor, salah satunya adalah penggunaan ruang kuliah. Ruang kuliah merupakan faktor penting dalam menunjang jalannya kegiatan perkuliahan. Beberapa kendala perlu diselesaikan untuk memilih ruang kuliah yang tepat seperti jarak antar-ruang, kapasitas ruangan, dan fasilitas ruangan. Model alokasi ruang kuliah ini menggunakan data jadwal perkuliahan di Program Studi Matematika Institut Pertanian Bogor yang melibatkan beberapa program studi lain seperti Statistika dan Aktuaria. Model optimasi ini menggunakan integer linear programming untuk meminimumkan jarak ruangan dengan mempertimbangkan kapasitas dan fasilitas antar-ruang. Dari hasil implementasi, diperoleh pengalokasian ruangan yang memenuhi semua kendala penggunaan ruang kuliah., Lecture scheduling is affected by several factors, of which is classroom use. The classroom is a significant factor in supporting the course of lecture activities. Several obstacles need to be solved to choose the classroom appropriately as the distance between rooms, room capacity, and room facilities. This classroom allocation model uses the data for class schedules at the Mathematics Study Program of the Bogor Agricultural Institute. This model involves several other study programs, including Statistics and Actuarial Science. This optimization model uses integer linear programming to minimize room distance by considering the capacity and facilities between rooms. From the implementation results, a room allocation obtained meets the constraints on classroom use.
Keyword: integer linear programming, room allocations, room distance, room facilities

Judul: Penjadwalan Mata Kuliah dengan Meminimumkan Banyaknya Ruangan
Abstrak: Course scheduling at Common First Year Program of Bogor Agricultural University (also known as TPB IPB) is determined by the number of available classrooms and the number of courses that are offered at TPB IPB. The university has to offer all of the courses that have to be taken by all of the first year students at IPB. All of the students are divided into a number of paralel classes. The size of the first year students implied the number of paralel classes is large, and this will increase the complexity of scheduling process.This study presents an optimization model for class scheduling at TPB IPB. Optimization model uses integer programming whose objective function is to minimize the number of required classrooms. The solution of the model is the schedule for each class for each course offered by TPB IPB, and the schedule obtained requires the minimum number of classrooms.
Keyword: Bogor Agricultural University (IPB), scheduling, integer programming, optimization

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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