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: Hospital Strategic Plan by Analyzing the Schedule of Operating Rooms.
Abstrak: Rumah sakit memiliki keterbatasan dalam melayani operasi yang diperlukan oleh pasien. Keterbatasan tersebut disebabkan oleh beberapa faktor antara lain banyaknya ruang operasi, banyaknya ahli bedah, dan jam kerja di rumah sakit. Dengan adanya keterbatasan tersebut maka operasi dapat ditunda atau dibatalkan. Penjadwalan operasi dapat dilakukan dengan menggunakan model matematika. Salah satu metode penjadwalan ruang operasi di rumah sakit adalah menggunakan mixed integer programming. Tujuan dari penulisan karya ilmiah ini adalah memodelkan masalah penjadwalan ruang operasi dalam bentuk mixed integer programming dan menyelesaikan model tersebut untuk meminimumkan biaya yang disebabkan oleh adanya penundaan pelaksanaan operasi, pembatalan pelaksanaan operasi, dan kekurangan jam penggunaan ruang operasi. Masalah penjadwalan ini memerlukan data perkiraan permintaan operasi pasien rawat inap, rawat jalan, dan pasien darurat, dan banyaknya ruang operasi berdasarkan spesialisasi pengobatan. Penyelesaian dengan menggunakan software LINGO 11.0 memberikan beberapa informasi antara lain banyaknya penggunaan ruang operasi biasa dan darurat, penundaan operasi bagi pasien rawat inap dan rawat jalan, dan banyaknya operasi pasien rawat inap dan rawat jalan yang dibatalkan. Hasil penelitian ini dapat dimanfaatkan oleh rumah sakit untuk mengevaluasi ketersediaan sumber daya yang ada. Seiring dengan peningkatan permintaan operasi pihak rumah sakit dapat memperkirakan kondisi optimal dari banyaknya ruang operasi, ahli bedah, dan jam kerja di masa yang akan datang.
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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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