Judul: Masalah Penjadwalan dan Penentuan Jumlah Kapal: Studi Kasus di Pelabuhan Merak dan Bakauheni
Abstrak: At peak season, the number of passengers and vehicles that uses ferry transport services is significantly increased. The increase of the number of passengers and vehicles can cause problems such as congestion on roads leading to the port and also hoarding of passengers and vehicles at the port. In order to minimize the impact of the increase of the number of passengers and vehicles, the provider of the ferry transport services must determine the optimum number of ships to be operated and develop appropriate scheduling. The problems can be modeled as an integer linear programming. This model is implemented in the case of the ports of Merak Banten and Bakauheni Lampung. With this model one can obtain the optimum number of ships and ferry schedule from one port to another port.
Keyword: ship, scheduling, port

Judul: Analisis Antrian Kapal di Pelabuhan Perikanan Pantai (PPP) Lampulo Banda Aceh
Abstrak: Queuing theory is the mathematical study of queues or waiting line events, which is a waiting line of constumers who require the service of the existing system. This study aims to identify the vessel queue landed in PPP Lampulo, identify the degree of usefulness of the system utility of unloading fasilities and identify the ship waiting time in the queue at PPP Lampulo. This study used a standard formula of a multi channel single phase to identify conditions of existing queue. The results showed that the model queue that occurred in PPP Lampulo was (M/M/5): (FCFS / I / I). Based on calculations by the standard formula queuing model, it was obtained that the rate of arrival of the vessel unloading was 14 vessels / day and the rate of the service time was 16 vessels / day. Value of waiting time in the queue was 0 hour and the number of vessels that queue did not exist, while the waiting time in the system was 2.5 hours and the number of ships arriving in the system was 1 ship.The result of the calculation also showed that utility value of the system almost reached the optimum value (0.875) and the probably no ship in a system was 0.42.
Keyword: Fishing Vessels, Lampulo, Coastal Fishing Port, queuing theory

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