Judul: Characteristics of the Boat-operated Lift Nets  Based at Carocok (Tarusan) Fishing Port, West Sumatra
Abstrak: Bagan perahu merupakan alat tangkap dominan yang beroperasi di perairan sekitar PPP Carocok (Tarusan). Hal ini berpotensi mempengaruhi ekosistem, khususnya ikan terget di daerah penangkapan ikan. Penelitian ini bertujuan mendeskripsikan karakteristik perikanan bagan perahu yang berbasis di PPP Carocok (Tarusan), Pesisir Selatan; dan menganalisis ikan target dan tingkat trofik hasil tangkapan bagan perahu di lokasi studi. Hasil penelitian menunjukkan bahwa bagan perahu di perairan Carocok (Tarusan) memiliki dua kelompok ukuran yaitu > 21 GT dan ≤ 21 GT. Ikan target tangkapan bagan perahu ≤ 21 GT adalah ikan teri (Stolephorus commersonnii) dan bagan perahu > 21 GT adalah ikan tongkol (Auxis thazard) dan ikan layang biru (Decapterus macarellus). Pola pertumbuhan ikan teri bersifat alometrik negatif, sementara ikan tongkol memiliki sifat isometrik. Ukuran layak tangkap ikan teri sebesar 65,7% tertangkap, ikan tongkol sebesar 65% tertangkap, dimana didominasi oleh tingkat trofik ke 3 (omnivora yang cenderung pemakan hewan) pada hasil tangkapannya., Boat-operated lift nets is the dominant fishing gear operating in the fishing ground of the fisher based in the coastal fishing port of Carocok (Tarusan). It potentially affects the ecosystem, mainly fish targets in the fishing ground. This study aims to describe the characteristics of the boat-operated lift nets fishery based at the coastal fishing port of Carocok (Tarusan), Pesisir Selatan; and to analyze fish target and trophic levels caught by the boat in the study area. The results of this study showed that the boat-operated lift nets in the waters had two size groups of the fishing vessels, namely > 21 GT and ≤ 21 GT. The target fish caught by boat-operated lift nets ≤ 21 GT was commerson's anchovy (Stolephorus commersonnii), while > 21 GT was frigate tuna (Auxis thazard) and mackerel scad (Decapterus macarellus). The commerson's anchovy growth pattern in the study area indicated a negative allometric, while frigate tuna was isometric. About 65.7% of the commerson's anchovy catch was higher than biological allowable catch size (length at first maturity), while the frigate tuna was about 65% of the total caught. Additionally, the catch of the boat-operated lift net was dominated by the group of fish in the trophic level 3 (omnivores with a preference for animals).
Keyword: boat-operated lift nets, biological allowable catch size, fish target, trophic level

Judul: The Performance of Lift Net Fisheries at Bandar Lampung Lempasing Coastal Fishing Port
Abstrak: Keragaan terhadap 3unit penangkapan bagan telah dilakukan di Bandar lampung. Tujuan penelitian untuk mendeskripsikan alat tangkap ke tiga unit bagan dan mengetahui perbandingan komposisi dan bobot hasil tangkapan dari setiap unit bagan. Metode penelitian yang digunakan adalah survey. Data hasil tangkapan ditabulasikan dan dianalisis secara deskriptif. Hasil penelitian menunjukkan 3 jenis bagan memiliki ciri khas masing-masing. Bagan apung memiliki ukuran kapal pengangkut 8 GT. Ukuran kapal bagan badak 8 GT dan bagan cungkil 21 GT. Hasil tangkapan utama dari bagan apung tercatat 8 jenis ikan dimana HTU tertinggi yaitu teri 793,8 kg dan HTS nya tembang 348,8 kg. Bagan badak tercatat mendapatkan 6 jenis ikan dengan HTU tertinggi teri 887 kg dan HTS nya tembang 420,2 kg. Sedangkan bagan cungkil tercatat 6 jenis ikan terdiri dari HTU tertinggi teri 1.008,2 kg dan HTS nya tembang 596,5 kg. Produktivitas bagan cungkil sebesar 688,7 kg/trip, bagan apung 69,74 kg/trip dan bagan badak 230,05 kg/trip., Performance of 3 lift net fishing units has been carried out in Bandar Lampung. The research objective are to describe the fishing unit the three types of and to compare the catch composition and weight of the catch from each fishing unit. The research method used was a survey. The catch data was tabulated and analyzed descriptively. The results showed that 3 types of charts have their own characteristics. The floating chart has a ship size of 8 GT and boat lift net ship size 8 GT. Cungkil lift net have a boat 21 GT. The main catch from floating lift net was recorded 8 fish species where the highest target catch (HTU) was Anchovies 793.8 kg and by catch of sardine 348.8 kg. Boat lift net was recorded to get 6 species of fish with the highest HTU of anchovies 887 kg and by catch of sardine 420.2 kg. Meanwhile, cungkil lift net have recorded 6 species of fish, consisting of the highest HTU for anchovy 1,008.2 kg and by catch of sardine 596.5 kg. The productivity of cungkil lift net is 688.7 kg/trip, floating lift net and bagan badak is 69.74 kg/trip and 230.05kg/trip respectively.
Keyword: boat lift net, catch, cungkil lift net, construction of lift net, floating lift  net

Judul: The Exploration of Discrete Logarithm over Finite Field GF(3m)
Abstrak: The security of many public~key algorithms is based on the problem of finding discrete logarithms. The generalized discrete logarithm problem is the following: given a finite cyclic group G of order n, a generator a of G, and an element fl E G, find the integer x, 0 ~ x ~ n - 1, such that 0: = fl. Algorithm for discrete logarithm problem focused on Menezes et al. (1997) that consist of exhaustive search algorithm, the baby-step giant-step algorithm, Pollard's rho algorithm, Pohlig-Hellman algorithm, and index-calculus algorithm. These algorithms are explorated to be used in discrete logarithm problem over finite field GF(3m ). The exploration also produces some algorithms, i.e. naif negative algorithm, baby-step mother-step algorithm, baby-step mother free-step algorithm, and baby-step free-step algorithm. All algorithms implemented using Maple 11. The Pohlig-Hellman and baby-step giant-step algorithms are efficient enough to be used in discrete logarithm problem over finite field GF(3m ) for m < 20.
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