Judul: Kajian bioekologi udang putih (Penaeus merguiensis de Man)
Abstrak: White shrimp abundance is greatly influenced by food availability, existence of predators and competitors, as well as by characteristics of mangrove habitat. Changes in habitat quality in mangrove ecosystem directly affects the growth of this biota. The objective of the research were to determine suitable habitat characteristics of white shrimp based on maturity stage, and to determine spawning peak season and recruitment of white shrimp in mangrove ecosystem of Percut Sei Tuan North Sumatera. White shrimp habitat characteristics was evaluated based on biophysical and chemical parameters of environment at each station using principal component analysis. Spatio-temporal distribution was evaluated based on gonads maturity index using correspondence analysis. Temporal distribution of female white shrimp was evaluated based on the maturity of gonads in each observation month. Correlation analysis of white shrimp spatial distribution with size, sex, gonads maturity, and mangrove species at each station/zone was also performed. Principal component analysis results described that correlation between parameters centered on two main axes, each explaining 76.27% and 17.62% of total range. The analysis classified three groups of individuals/station. Group I consisted stations 1, 2, and 3 characterized by dissolved oxygen, nitrate, phosphate, current speed, and clay substrate. Group II consisted stations 4 and 5 characterized by mangrove density, litter production, plankton abundance and macrozoobenthos, and high litter decomposition rates. Group III consisted of six stations characterized by water temperature, brightness, depth, salinity, pH, and high sand substrate. Analysis of white shrimp spatial distribution based on gonads maturity level using correspondence analysis showed information which centered on two main axes, each explaining 65.17% and 28.60% of total range. Analysis results also showed female adult white shrimps with mature gonads were found in waters which have temperature 29.00°C - 30.5°C, salinity 31‰ - 31.20‰, and pH 7.05 - 7.40. Spawning peak season of white shrimp in Mangrove Ecosystem of Percut Sei Tuan in June and January, and recruitment between September and October, as well as February and March.
Keyword: White Shrimp, Penaeus merguiensis, spatio-temporal distribution, mangrove ecosystem

Judul: Kajian penangkanapan udang putih kecil (Metapenaeus lysianassa, de Man 1888) sebagai aplikasi pengelolaan di muara Sungai Kakap Kabupaten Pontianak Kalimantan Barat
Abstrak: Small white shrimp (Metapenaeus lysisanassa) fishery using setnets in Sungai Kakap estuary increased from the year 1994 to 2005 and this sector gave a lot of benefit for fishermen. The advantages of this shrimp fishery are providing work and income for local people, providing of nutritious food for human life and local government income from tax or retribution. However, the increasing fishermen effort to catch small white shrimp in this estuary is estimated to be followed by decreasing of their productivities and declining of CPUE trend. The objectives of the study are to obtain distribution pattern of small white shrimp caught by setnet and to obtain CPUE (Catch per Unit Effort) trend of small white shrimp fishery. Eleven stations were established in this site to learn distribution pattern of small white shrimp caught by setnet and time series data of catch and effort was used to calculate the trend of CPUE. The study got information that distribution pattern of small white shrimp was caught in higher numbers in salinity interval 5 – 7‰. Bigger sizes of small white shrimp were found in salinity 10 - 20‰. CPUE of small white shrimp caught by setnet tends to decrease during twelve years.The study result is expected to give information for management plan to manage of small white shrimp fishery.
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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