Judul: Distribusi, Kelimpahan dan Variasi Morfologis serta Makanan Bintang Laut (Protoreaster nodosus) di Perairan Waleo dan Bunaken Sulawesi Utara
Abstrak: Penelitian ini dilakukan untuk mengetahui hubungan antara karakteristik habitat dan biologi bintang laut P. nodosus, pola distribusi, kelimpahan, variasi morfologis, makanan dan kebiasaan makan. Pengukuran kondisi fisika-kimia perairan dilakukan bersamaan dengan waktu pengambilan sampel bintang laut. Tekstur substrat dianalisis di laboratorium Morfologi Pantai dan Hidro-Oseanografi Fakultas Perikanan dan Ilmu Kelautan Unsrat Manado, dengan menggunakan metode pengayakan. Untuk mengetahui pola distribusi dan kelimpahan bintang laut dilakukan metode transek, dengan ukuran kuadran adalah 1 x 1 meter sebanyak 10 buah pada tiap sub-stasiun dengan penempatan secara beraturan. Di lokasi penelitian dilakukan penimbanmgan bobot tubuh dan pengukuran terhadap panjang lengan, tebal cakram dari tiap individu sampel, serta pengamatan variasi warna. Untuk analisis makanan digunakan 30 individu pada tiap lokasi, sedangkan untuk mengetahui aktifitas makan dilakukan pengambilan 2 individu pada tiap interval waktu 2 jam selama 24 jam. Isi lambung tersebut diamati di Laboratorium Bioteknologi Kelautan dan Biologi Kelautan Fakultas Perikanan dan Ilmu Kelautan serta Laboratorium Dasar Unsrat Manado., This research has been conducted in the Waleo and Bunaken waters of North Sulawesi from May to August 2000. The purpose of this study is to investigate the correlation between habitat and biological characteristics i.e. distribution path, abundance, morphological characteristics, feeding preference and habits. The method used to know the distribution and abundance was the transect method, 1x1m in size. Each location was represented by 3 stations. thirty starfishes where used to analyze stomach content. Feeding activity was observed from each 2 individuals at 2 hours interval for 24 hours. The correlations between habitat and biological characteristics of P. nodosus were analyzed by the Primary Component Analyses. The distribution path by the Index of Morisita analyses, folowed by the khi-kudrat test and by t-test for abundance. Stomach content was analyzed by the Index of Preponderance and Index of Electivity. The distribution of both small and medium size of P. nodosus was characterized by coarse sand and high temperature, low salinity and slow current speed. While those of the large size of P. nodosus was characterized by fine sand, high salinity, disolved oxygen, low coarse sand and strong current speed. The large size of P. nodosus have higher weigh of seagrass in their stomach than those of the small and medium sizes of P. nodosus. The distribution path of starfishes in two locations of research was a typical cluster. The highest abundance has been found in the waters of South Waleo (20 starfishes), and South Bunaken (17 starfishes). The length of starfish's arms is about 7.8-12 cm, 174.4-379.1 grams in weight, and 1.8-4 cm in height. The result of stomach content analyses showed that the seagrass has the highest percentage in the stomach. Food items wich were positively choosen were T. Hemprichii, C. serrulata and E. acoroides. The feeding time of starfish is at day time (06:00 18:00 hours)
Keyword: Asteroidea, Distribution, Abundance, Morphological characteristic, Feeding preference

Judul: Struktur dan Sebaran Komunitas Bintang Laut (Asteroidea) di Perairan Pulau Sapudi, Kabupaten Sumenep, Madura
Abstrak: One of the marine life which has not been widely known for its benefits are sea stars (starfish). Research on sea stars have not been widely reported or investigated in Indonesia compared to other countries such as Australia and Japan. The purpose of this research is to know the community structure of sea star (Asteroidea) and to know the relation between sea star with its characteristic of habitat. This study was conducted in June that starts with a site survey on June 28, 2012. Primary data collection at the study site on June 30, 2012 to July 3, 2012. This research was conducted in the coastal Sapudi Island, Sumenep, Madura. Data were collected by the line transect method which lay down along 50 meters. At each transect lines were laid 1 x 1 meter transect plots. Data analysis using the calculation of density of seagrass, density, dominance and the pattern of sea stars spreading and the relation between sea star and habitat characteristic. There are 4 species of starfish that can be found in the Sapudi Island, such as Arcaster typicus, Culcita novaeguineae, Linckia laevigata, and Protoreaster nodosus. Linkia levigata is one of the starfish species that can be found in every station. Five species of seagrass as one of the starfish habitat can be found in Sapudi Island, such as Cymodocea rotundata, Enhalus acoroides, Halophila ovalis, Syringodium isoetifolium, and Thalassia hemprichii. Thalassia hemprichii is the most dominated species in Site 1, Site 3, and Site 4. In Site 1, there can be found two types of seagrass, they are Thalassia hemprichii and Syringodium isoetifolium. Based on Morisita index, spread of Asteroidea in Sapudi Island consist of two species of distribution, such as cluster for Protoreaster nodosus and Arcaster typicus and kindred Linckia laevigata and Culcita novaeguineae.
Keyword: Sapudi island, habitat of seagrass, sea stars, distribution, community structure

Judul: Formulasi Algoritme Operasi Grup Jacobian Kurva Hyperelliptic ...
Abstrak: Dalam geometri aljabar, kurva hyperelliptic merupakan bentuk umum dari kurva elliptic. Kurva ini apabila dikenakan pada suatu lapangan berhingga akan membentuk suatu grup siklik. Pada kriptografi, khususnya enkripsi kunci publik, grup siklik yang dibangkitkan oleh kurva elliptic sudah banyak diteliti. Bahkan untuk kurva ini sudah memiliki standar oleh National Institute of Standard and Technology (NIST) Amerika. Sedangkan, untuk grup yang dibangkitkan oleh kurva hyperelliptic masih memiliki kekurangan dalam hal komputasinya. Tujuan dari penelitian ini adalah mengkonstruksi suatu lapangan berhingga pada , memilih kurva hyperelliptic atas lapangan hingga yang memenuhi kriteria keamanan untuk kriptografi, dan membuat formulasi operasi grup kurva hyperelliptic menggunakan algoritme Cantor. Dalam merekonstruksi lapangan hingga, terlebih dahulu tentukan dimensi dari lapangan hingga tersebut dan polinomial tak-teruraikan. Kemudian dipilih kurva hyperelliptic atas lapangan tersebut. Pada penelitian ini, kurva yang dipilih adalah = + + dengan lapangan hingga . Berdasarkan kurva yang dipilih, akan dibentuk suatu operasi grup dengan menggunakan algoritme Cantor, sehingga menjadi lebih aritmatik. Eksplorasi kurva hiperelliptic dilakukan untuk mengetahui keamanan dari kurva yang dipilih. Dengan menyusun algoritme operasi grup dari kurva yang dipilih, diperoleh perhitungan yang lebih aritmatik dan dapat diimplementasikan pada kriptografi kunci publik. Dari segi keamanan kurva telah memenuhi standar sehingga tahan terhadap serangan-serangan seperti Poligh-Hellman, Polard- , ataupun Frey-Ruck secara teorema.
Keyword: algoritme Cantor, kriptografi, kunci publik, kurva hyperelliptic, operasi grup