Judul: Implementasi Mix Fleet Vehicle Routing Problem pada Pengangkutan Pegawai IPB dengan Menggunakan Bus IPB
Abstrak: Employee shuttle service is one of important activities of an institution in managing its employees come to the work on time. In this paper, the problem of transporting employees is formulated into the form of Mix Fleet Vehicle Routing Problem whose objective is to minimize traveling cost or to minimize the number of buses used. The constraints in this paper are time availability, vehicle capacity, traveling cost, and number of employees. This problems is formulated as an Integer Linear Programming and solved by using LINGO 11.0. It is shown that the traveling cost and the number of buses in use are minimum.
Keyword: shuttle., mix fleet vehicle routing problem, integer linear programming, employee

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: 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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