Judul: Penjadwalan Bus dan Mobil Listrik di Kampus IPB Menggunakan Integer Linear Programming
Abstrak: Program Green Transportation IPB mengharuskan IPB mengoperasikan kendaraan bus dan mobil listrik untuk memfasilitasi sivitasnya dalam melakukan mobilitas di kampus IPB. Pengoperasian bus dan mobil listrik terkait erat dengan masalah penjadwalannya. Upaya menentukan skenario penjadwalan terkait dengan banyaknya bus dan mobil listrik yang harus dioperasikan pada setiap periode waktu sangat diperlukan guna meminimumkan biaya operasional. Penelitian ini memberikan model optimasi untuk menentukan penjadwalan bus dan mobil listrik di kampus IPB dalam satu hari. Model diformulasikan menggunakan Integer Linear Programming (ILP) dan diimplementasikan di koridor 3 kampus IPB menggunakan bantuan software LINGO 11.0 dengan fungsi objektif meminimumkan biaya operasional.
Keyword: Integer linear programming, optimasi, penjadwalan

Judul: Penjadwalan mata kuliah menggunakan integer linear programming: studi kasus di Direktorat Program Diploma IPB
Abstrak: Penjadwalan mata kuliah di suatu perguruan tinggi mempunyai beberapa kendala, antara lain kendala waktu pelaksanaan kuliah yang sesuai dengan bobot sks, mata kuliah yang wajib dilaksanakan di suatu ruangan tertentu dan keterbatasan jumlah ruangan serta kapasitasnya. Karya ilmiah ini memberikan model untuk menentukan penjadwalan mata kuliah di Program Diploma IPB dengan fungsi objektif meminimumkan tingkat ketidakefisienan terhadap pelaksanaan mata kuliah di dalam ruangan tertentu. Model diformulasikan menggunakan Integer Linear Programming dan diimplementasikan menggunakan software LINGO 11.0.
Keyword: Integer Linear Programming, scheduling

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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