Judul: Analisis Pengaruh Dinamika Peer pada Hierarchical Peer-to-Peer Menggunakan Topologi Superpeer
Abstrak: Peer-to-peer network is a new paradigm to build a distributed network application. The network that is created is a heterogeneous network consisting of different resources, operating systems, and protocols. Peers connected in different networks can cause stability problem to peerto- peer network. Hierarchical peer-to-peer is a new paradigm which can solve the problem heterogeneous network by using two layers. Superpeer is one topology that uses this concept. This research shows the dynamism of peers connected in Superpeer topology with many conditions. Maximum capacity, degree, and value distribution are the parameters used to see the stability of this topology. Topology stability is marked by attaining ideal topology configuration that is the minimum amount of Superpeer node. The result of this research shows that different distributions result in different amount of Superpeer. The higher maximum node capacity, the fewer number Superpeer is required and the smaller cost of communication to achieve stability is needed, but the total of movement is higher. The total of used degree in both distributions gave better result for the amount of Superpeer, communication costs, and the amount of movement.
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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: Ornithonyssus Bursa (Berlese, 1888) Famili Macronyssidae yang Menyerang Unggas Dan Penaggulangannnya
Abstrak: Ornithonyssus bursa adalah tungau penghisap darah pada unggas di daerah tropis dan subtropis. Tungau ini relatif kecil, dengan panjang tubuh antara 700-1000 mikron dan lebarnya 250-490 mikron. Tubuhnya bulat berwarna coklat kekuningan sebelum menghisap darh dan berwarna merah setelah menghisap darah dari induk semangnya.
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