Judul: Penjadwalan Mata Kuliah Mayor-Minor: Studi Kasus di FMIPA IPB
Abstrak: A curriculum called a major-minor curriculum has been used at Institut Pertanian Bogor (IPB) in the last six years. Several problems have been identified during the implementation of curriculum, one of them is related to the course scheduling. The problem on course scheduling has become a main problem in the implementation of the curriculum, because it has been found that students from a particular major would not be able to take courses from his/her chosen minor, since the courses are scheduled at the same time. This study addresses the problem on course scheduling for the major-minor curriculum. This problem is modeled as an integer linear program. The model is implemented for scheduling case at FMIPA IPB. The development of the model is initiated by identifying the necessary requirements for the course scheduling. All of these requirements are then formulated as linear equalities and or inequalities. The objective function is to minimize the rejection indicators of lecturers related to the days and time period of courses in the schedule. Several assumptions are used in this model for simplification, one of them, for example all of the classrooms are assumed to be homogen (capacity, equipment, etc.). The model can be improved later by relaxing these assumptions. The solution of the model is obtained using LINGO 11.0. This study produces a scheduling for the course that fulfills all of the requirements for major-minor curricullum at FMIPA IPB. The scheduling minimizes the rejection indicators of lecturers related to the days and time period of courses in the schedule.
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Judul: Penjadwalan mata kuliah mayor-minor menggunakan goal programming: studi kasus di Departemen Matematika FMIPA IPB
Abstrak: Jadwal mata kuliah mayor-minor yang tumpang tindih sering menjadi masalah untuk mahasiswa dalam rencana studinya. Karya ilmiah ini memodelkan masalah penjadwalan mata kuliah mayor-minor. Banyaknya mata kuliah, ketersediaan hari dan ketersediaan periode waktu adalah komponen yang berkaitan dalam penjadwalan mata kuliah. Model ini diimplementasikan pada kasus penjadwalan di Departemen Matematika FMIPA IPB. Metode yang digunakan dalam pemodelan ini adalah goal programming. Solusi model ini diperoleh dengan menggunakan software LINGO 11.0. Penelitian ini menghasilkan sebuah jadwal mata kuliah yang memenuhi syarat-syarat penjadwalan mata kuliah mayor-minor di Departemen Matematika FMIPA IPB. Jadwal ini meminimumkan jumlah jadwal mata kuliah yang tumpang tindih.
Keyword: courses, goal programming, major-minor, scheduling

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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