Judul: Development of Pelagic Fishing Unit in South Bangka Regency
Abstrak: The fishery condition in South Bangka Regency still has some limitation, among others are the capacity and unattainability of fishing ships, low fishermen knowledge in the modern fishing technology, and capability of local fishermen to fish in a long period is limited, so that they tend to use fishing gear that only sufficient to use a long the shore.Another fact proved that in general fish resource utilization is still carried out using stationary fishing net i.e. bottom gillnet and hand line so that the fishery potency especially pelagic fish is not optimized. The objectives of the research are first to carried out a selection on fishing unit based on, biology, economy, and social aspects, secondly to look for optimum pelagic fishing allocation in the South Bangka Regency and third to determine the strategy for the development of pelagic fishery in South Bangka Regency. The methodology being used were survey and observation on the pelagic fishery condition at the research location. Data was obtained through direct interview with the pelagic fishery fishermen based on the fishings gears they used. Interviews were also carried out with the fishery stakeholders and collectors i.e. PPI Sadai and local fishery ageny officers. The dominant fishing gears used by the fishermen were line fishing, stationary life net, and gillnet. A new fishing gear that was the millenium net that was introduced by Andon fishermen from Indramayu Regency. Based on the financial criteria analysis the stationary life net has the bighest R/C value compared to other fishing gears. Therefore, it is expected that stationary life net will develop rapidly. However, looking into the investment criteria the stationary life net has low B/C value compared to boat life net. In this regard, both fishing gears could be considered to be developed in South Bangka Regency. The analysis of the four (4) aspects i.e. biology, technical, economy, social presented that in sequence the unit that has good prospect to be developed are millennium net boatlife net, line fishing, stationary life net, and gillnet. To have optimum utilization of existing pelagic fish resource a strategy was prepared based on the resource characteristic and local community. The first strategy is fish resource utilization using environment friendly fishing gear and second improved productivity and value added of pelagic fish. The formulated strategy could be taken as a reference by the South Bangka Regency Local Government to decide the policy and program in the development of the pelagic fish in this area using the fishing principle that are accountable and environment friendly, beside that the program should be able to overcome the problem arouse in the community to reach higher fishermen productivity and welfare.
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Judul: Pengembangan Perikanan Tangkap Berbasis Optimasi Sumberdaya Ikan Pelagis di Kabupaten Banyuasin Propinsi Sumatera Selatan
Abstrak: The pelagic fish is one of potential fishery resources in Banyuasin District. The production of pelagic fish fishery landed in Banyuasin District was 29,6 ton in year 2006. The objectives of the research were 1) to determine fishing technology for pelagic fish which more effective, efficient and sustainable based on biological, technical, social, economic and environment aspect; 2) to allocate optimum of pelagic fish catching unit in Banyuasin District; and 3) to determine development strategy of pelagic fisheries. The result of this research indicated that drift longline fishing technology is more effective, efficient and sustainable than drift gillnet and liftnet. The number of optimum allocation of fishing unit has been calculated which consist of drift longline 51 unit, drift gillnet 45 unit and liftnet with 55 unit. The output of feasibility analysis of drift longline fishery is the study area, indicated profit of Rp. 18,767,666, its NPV value was Rp. 55,855,075, Net B/C was 2.22, the BEP value was Rp. 39,055,258 that equal to production 23,669 kg, the ROI and IRR value were 41 % and 48. The output of feasibility analysis of drift gillnet fishery is the study area, indicated profit of Rp. 17,320,000, its NPV value was Rp. 46,437,216, Net B/C was 2.08, the BEP value was Rp. 26,951,872 that equal to production 16,171 kg, the ROI and IRR value were 40 % and 48 %. The output of feasibility analysis of liftnet fishery is the study area, indicated profit of Rp. 23,610,000, its NPV value was Rp. 214,477,312, Net B/C was 3.94, the BEP value was Rp. 31,292,924 that equal to production 16,506 kg, the ROI and IRR value were 32 % and 83 %. The development strategy of pelagic fisheries in Banyuasin District are: (1) optimization pelagic fish fishery with drift longline; (2) development pelagic fish fishery focusing in 6-12 mile zone; (3) Increase management effort of fisheries business; (4) revitalization of fisheries infrastructure and facility; and (5) Empowering scale of fishing fleet and its technology.
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Judul: Kombinasi algoritma sha 1 dan algoritma rsa untuk membentuk tanda tangan digital
Abstrak: Tanda tangan digital termasuk ke dalam teknik kriptografi yang memanfaatkan teknologi kunci publik (enkripsi asimetris). Tanda tangan digital dapat dibuat dengan mengkombinasikan teknik hashing (untuk membentuk message digest dari pesan asli) dan enkripsi asimetris (untuk membentuk kunci publik dan kunci privat). Teknik hashing yang digunakan adalah teknik rashing satu arah dengan menggunakan algoritma SHA 1, sedangkan algoritma RSA digunakan untuk enkripsi asimetris Tulisan ini bertujuan untuk mempelajari, menganalisis, dan mengimplementasikan pembentukan dan verifikasi tanda tangan digital menggunakan dua metode, yaitu dengan mengkombinasikan algoritma SHA 1 dan algoritma RSA dan dengan menggunakan algoritma RSA saja. Analisis yang dilakukan pada kedua algoritma ini meliputi analisis algoritma, dan analisis hasil implementasi. Analisis terhadap algoritma SHA | menunjukkan bahwa algoritma ini memiliki kompleksitas O(n) untuk kasus terburuk. Sedangkan untuk pembentukan kunci publik dan kunci privat dengan algoritma RSA diperlukan beberapa algoritma pendukung, yaitu algoritma Miller Rabin, Witness, Euclid, dan Extended Euclid. Semua algoritma pendukung tersebut memiliki kompleksitas waktu yang sama, yaitu O(k), dengan adalah panjang representasi bit bilangan bulat. Kompleksitas waktu yang didapatkan untuk proses pembentukan tanda tangan digital dengan kedua metode ini adalah sama yaitu O(nk). Untuk proses verifikasi, kompleksitas waktu yang didapatkan dengan menggunakan kombinasi dua algoritma adalah O(1 + k) dan untuk algoritma RSA adalah O(n + k). Pada proses pembentukan tanda tangan digital menggunakan kombinasi dua algoritma yang ditandatangani adalah message digest yang dihasilkan oleh algoritma SHA 1, sedangkan pada algoritma RSA yang ditandatangani adalah pesan itu sendiri. Dari hasil implementasi didapatkan untuk proses pembentukan tanda tangan digital menggunakan kombinasi dua algoritma lebih cepat dibandingkan dengan menggunakan algoritma RSA saja untuk file-file yang berukuran besar, dst
Keyword: Tnda Tangan Digital, Teknik Kriptografi, Enskripsi Asimetris