Judul: Simulasi fungsi agregat pada jaringan Peer to Peer (P2P)
Abstrak: Akses terhadap informasi global pada suatu sistem terdistribusi merupakan hal yang sangat penting. Sebagai contoh yaitu informasi mengenai jumlah total free space pada sebuah jaringan basisdata terdistribusi atau jumlah beban rata-rata dan maksimum setiap cluster pada suatu jaringan cluster, yang apabila informasi tersebut diketahui maka beban ideal untuk setiap cluster dapat ditentukan.
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Judul: The Decrease of Freeriding Effect to the Resource Providers in Peer-to-Peer File Sharing System with Social Network Information
Abstrak: Freeriders only use system resources without sharing any resources to others or sharing re-sources which are not used by the system. This behavior is one significant problem that needs to be considered in improving the quality of P2P file sharing system. Moreover, it can lead the system to lack of quality resources, and hence, its performance will gradually decrease and further possibly collapse. Many studies raised concern on how social network information can reduce this behavior and improve the system performance. This research applies social network information by using a SocialGnutella algorithm to P2P file sharing system. The algorithm is simulated to observe how the system used to numerous peers in the contact list. This simulation used 512 and 1024 peers with each peer having five transactions and 30 repetitions in merge. Available bandwidth and utility of resource provider used to measure the system performance during the simulation. From the simulation, average utility of resource providers in the system using social network information reached 0.959 and 0.979 for 512 and 1024, respectively. Whereas in the system which is not used social network information reached 0.527 and 0.531. Average utility is significantly higher based on the t-test result at 99.9% confidence level. Hence, system which is used social network information can decrease the freeriding behaviour and directly impact the resource provider.
Keyword: peer-to-peer file sharing system, social network information, SocialGnutella, available bandwidth of resource providers, utility of resource providers

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