Judul: Integer Linear Programming Models for Nurse Scheduling
Abstrak: Nurse scheduling is one of the critical problems faced by a hospital management. Developing a good schedule is very important, because it will influence the quality of services in the hospital. Currently, the schedule development is constructed manually, this method requires a significant amount of time, nevertheless it yields a suboptimal quality of schedule. The aim of this research is to develop on optimization model for nurse scheduling problem. The optimization model will minimize the deviation of total workdays of nurses from the standard workdays. The optimization model also considers various working requirements of the nurses and various regulations from the hospital. The optimization model is implemented at Rumah Sakit Umum Daerah (RSUD) 1. A. Moeis Samarinda using LINGO software.
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Judul: Penjadwalan Perawat Rumah Sakit Menggunakan Integer Linear Programming
Abstrak: Dampak dari Pembatasan Sosial Berskala Besar diperlukannya penjadwalan ulang staf/personel dari jadwal yang sudah ada. Penjadwalan perawat merupakan masalah penting bagi rumah sakit, sehingga diperlukan pengelolaan penjadwalan yang tepat. Penjadwalan secara otomatis dapat dilakukan dengan bantuan software seperti LINGO. Dalam karya ilmiah ini, permasalahan penjadwalan dapat dimodelkan sebagai masalah integer linear programming lalu akan dibuat ke dalam 5 skenario berbeda. Fungsi objektifnya adalah meminimumkan biaya keseluruhan yang harus dikeluarkan Rumah Sakit sesuai dengan peraturan atau kendala yang ada di rumah sakit. Penjadwalan dengan lima skenario akan dimasukkan ke dalam proses komputasi dan diselesaikan dengan bantuan software LINGO 18.0, The impact of large-scale social restrictions necessitates rescheduling of staff or personnel from the existing schedule. Nurse scheduling is an important issue for hospitals, so proper scheduling management is needed. Automatic scheduling can be done by software such as LINGO. In this scientific paper, scheduling problems can be modeled as integer linear programming problems and then divided into 5 different scenarios. Its objective function is to reduce the overall costs must be incurred by the hospital with the hospital's regulations or constraints. Scheduling with five scenarios will be included in the computation process and solved with software LINGO 18.0.
Keyword: Hospital, Integer Linear Programming, Nurse Scheduling

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4