Judul: Penjadwalan Kamar Operasi Menggunakan Pemrograman Linear Bilangan Bulat
Abstrak: Operating room scheduling in hospitals is undertaken based on a master surgery schedule, which can be formulated manually or by using mathematical programming. Some hospitals, such as state owned hospitals, receive budget or subsidy from the government to carry out its daily management, including surgery services. But for some reason, government may reduce the budget. The impact of budget cuts to hospitals is immediate. They must adjust the operating time and the number of operating rooms in services. In this work, operating room scheduling problem is modeled in the form of an integer linear programming. The objective function is formulated to maintain as much as possible the proportion of service time in each surgical division, although work hours and the number of operation rooms are reduced. As a case study, we consider a scheduling problem in a hospital with 6 surgical divisions and 4 types of operating rooms, which gives a total of 14 rooms. We discuss three schedulling adjustments, namely (i) model 1: total operating time is obtained by reducing the number of operating rooms, (ii) model 2: total operating time is obtained by reducing the number of operating rooms more than that of model 1, (iii) model 3: total operating time is obtained by reducing the total of work hours, while the number of operating rooms is as model 1. The results obtained are in the form of schedules that minimize the differences of time allocation between master surgery schedule and the new schedule.
Keyword: 

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
Keyword: 

Judul: Durability of Specific Immunoglobulin (Ig) Y Againts Influenza and Covid-19 in Sunscreen
Abstrak: The benefit of specific immunoglobulin Y (Ig Y) as an active ingredient in personal care products such as sunscreen has not been properly studied. Our study aims to evaluate the reliability of specific IgY against influenza and the COVID-19 virus in a sample sunscreen product. Specific IgY influenza and COVID-19 viruses were inserted in the sample sunscreen at two concentrations of 0.1% and 0.25%. Three treatments were observed: control (C) sunscreen without IgY, treatment 1 (T1) sunscreen with 0.1% IgY, and treatment 2 (T2) sunscreen with 0.25% IgY. Organoleptic observations were carried out to monitor changes in aroma, color, and texture, and sunscreen sampling was done every week for 6 weeks. The durability of IgY was evaluated using an enzyme-linked immunosorbent assay (ELISA) and a neutralization assay. Organoleptic observation from weeks 1 to 6 showed consistency in its aroma, color, and texture. Enzyme-linked immunosorbent assay and neutralization assay (NA) results of the T1 and T2 groups showed negative results except for sample T1 at week 5, which showed a positive result in the Influenza A ELISA. Based on the results, it seems that IgY concentrations of 0.1% or 0.25% were not optimal. However, this negative result might be due to low concentration of the IgY and the presence of beeswax, which inhibits IgY and causes it to dissolve in distilled water, thus preventing it from being detected in the assay.
Keyword: Immunoglobulin Y, Sunscreen, Influenza, COVID-19, Biological Activity