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: 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: Pengaruh Jumlah Bahan Pretanning dan Minyak Biji Karet (Hevea brasiliensis) Terhadap Mutu Kulit Samoa. Di
Abstrak: Animal hides or skins are the most valuable by product of the meat industry. Most of those hides are converted into leather by leather tanning process. Chrome based tanning is the most popular tanning process. At the chrome based tanning process, a lot of amount chrome are throw away into the environment that make a significant effect to the biological and ecological environment damaged. Due to concerns over the use and disposal of chromed tanned leather, the leather industry is now facing increasing scrutiny over its use of chrome as tanning agent. The use of non-chrome tannages has gradually become pre-eminent to producing leather, particularly in the European automotive leather markets. Chamois leather is one of leather product. It is produced from animal hides/skins by oil tanning process, usually with fish oil. High price and odour problems to the chamois leather that produced using fish oil motivate to do some research to solve that problems. Rubber seed oil is an oil that predicted can substitute fish oil. Pretanning process is needed to increase the oil penetration and protects the pelt from putrefying during oxidation periods (Khrisnan et al., 2005). Relugan GT 50 is the agent that used on this research. Relugan GT 50 is an aldehyde tanning agent, produced by BASF. This research was aimed to find out the effects of Relugan GT 50 concentration (offer) and rubber seeds (Hevea brasiliensis) oil to the chamois leather’s quality. Beside that, this research is also aimed to decide the best combination of the factors to produce chamois leather also to know the chamois leather characteristics. The preliminary research was carried out by analyzing the rubber seed’s kernel and eggshell as well as physico-chemical properties of the rubber seed oil. The main research was done by tanning the skin with Relugan GT 50 in concentrations of 1.5, 3.0 and 4.5% followed by rubber seed oil concentrations of 10, 20, and 30%. The experimental design used was completely randomize factorial design. The preliminary research shows that rubber seed’s kernel was 49% and rubber seed’s eggshell was 51%. The rubber seed’s oil characterstics were density of 0.94 (g/cm3), viscosity of 48,4 centistokes, colour of 2713 PtCo units, inodine value 113 g iod/ 100 g, peroxide value of 24 miliequivalent/1000 gram oil, acid value of 15 mg KOH/g oil and FFA content of 5.8%. The research shows that Relugan GT 50 concentration significantly affected shrinkage temperature (Ts) and pH; rubber seed oil concentration significantly affect the organoleptic properties of the leather. The optimum conditions for the tanning were Relugan GT of 3.0% concentration and 10% rubber seeds oil. The physical properties of the leather were shrinkage temperature of 75oC, thickness of 0.92 mm, tensile strength of 21.50 N/mm2, elongation at break of 144%, tear strength of 55.77 N/mm, water absorption of 266% (2 hours) and 299% (24 hours). The chemical properties were oil content of 2.5%, ash content of 1.2% and pH of 8. The organoleptic properties were softness of 7–8, colour of 8-9, and odour of 8-9.
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