Judul: Penjadwalan Operasi Bedah Menggunakan Integer Programming : Studi Kasus Optimasi Waktu Target Ahli Bedah di Rumah Sakit Jakarta Eye Center
Abstrak: The limitation of operation equipments, the availability of operating room and surgeon as well as the duration of time available for an operating room use, have complicated hospital management in making decision to schedule surgical operation. Each surgeon in a hospital has a target of operating time set by the hospital. Schedule should consider the available surgeon and the targeted operating time. This paper presented a model of integer programming which use the availability of operating room to time at a hospital by minimizing the total underallocation of operating room time for each surgeon, relative toward the targeted time of each surgeon, considering the limitation and availability of surgeon, equipments, and operating room. The result of this research is a surgical operation schedule with an optimum surgeon’s targeted operating time. In this case, the hospital could evaluate that the facilities owned by the hospital, such as equipment operations, operating room, and surgeon, was already sufficient
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Judul: Penjadwalan Perawat Kamar Operasi Menggunakan Pemrograman Integer: Studi Kasus di Rumah Sakit OMNI Internasional Tangerang
Abstrak: A nurse scheduling on operating room problem is often faced by the hospital management. Regulations and limitations of nurse imposed lead to be a determining factor in scheduling. This paper presents an integer programming model to build schedule on operating room nurses which minimizes operational costs by taking into account the constraints associated with the regulation of hospitals and the number of available nurse as an objective function. Implemented model in the OMNI Internasional Hospital Tangerang produces better nurse schedule compared to the schedule created manually
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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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