Judul: Sustainable Development of Small-Scale Yellowfin Tuna Fishing in Western Seram District
Abstrak: Penelitian ini secara umum bertujuan untuk menyusun rancangan model pengembangan usaha penangkapan madidihang skala kecil di Kabupaten Seram Bagian Barat secara berkelanjutan. Tujuan khusus penelitian ini adalah untuk: (1) menentukan faktor-faktor yang berpengaruh terhadap produktivitas usaha penangkapan madidihang, (2) menentukan jenis armada penangkapan dan alokasi jumlah optimumnya, (3) mendesain sistem penanganan ikan madidihang di atas kapal dan pemasarannya, (4) menentukan sistem bagi hasil antara pemilik modal dan ABK, dan (5) menentukan strategi pengembangan perikanan tuna skala kecil di perairan Seram Bagian Barat dan sekitarnya., This research is aimed to propose a model of sustainable development of small-scale tuna fishing in Western Seram district. The specific objective of this study are: (1) to determine influencing factors on fishing productivity; (2) to determine the fishing boats and their optimum numbers; (3) to design fish processing and marketing of yellowfin tuna; (4) to propose a fair and sustainable sharing system between the capital owners and the crews; (5) and to determine a development strategy of small-scale fishing in Western Seram and its surrounding waters. In order to achieve these objectives, the data were analysed by means of several statistical techniques: All factors influencing fishing productivity was analyzed by means of a Structure Equation Model (SEM).
Keyword: sustainable development, small-scale fishing, yellowfin tuna, Western Seram

Judul: Tuna fisheries management strategies in an optimal and sustainable in Buru District, Maluku Province
Abstrak: Tuna fishery is one of the leading sectors of fisheries in Buru District. This fishery has been going on a few years ago, and an artisanal fisheries that have evolved from the subsistence fisheries to commercial fisheries. This sector is a significant contribution to meeting the needs of food, employment, public welfare, and the development of regional economy. Sustainability of these contributions, depending on the management of the fishery. Good fisheries management is to ensure the sustainability of the fish resources, environmental, socio-economic, and institutional aspects. To carry out the management approach, it takes a variety of information such as biology, ecology, socio-economic and institutional information, as an evaluation, improvisation, and execution management. This study was conducted as an attempt to provide such information . The purpose of this study was to : (1) analyzing the condition of tuna resources in Buru District which includes estimates of potential maximum sustainable yields and some population parameters, (2) to analyze the feasibility of tuna fishing units, (3) optimization of the allocation of fishing effort, and (4) formulate strategies for optimal and sustainable management of tuna fisheries in Buru District . Surplus production model (SPM) was used to assess the maximum sustainable yield of tuna fish resources. Some parameters of tuna populations known with length and weight analysis, the pattern of growth, mortality rate and exploitation rate. Feasibility of tuna fishing units were analyzed using financial feasibility analysis, which consists of business analysis and investment criteria analysis. Business analysis include: analysis of revenue, revenue cost ratio (R/C), payback period (PP) and the break-even point (BEP). Analysis of investment criteria include the net present value (NPV), internal rate of return (IRR) and net benefit cost ratio (Net B/C). Optimization of the allocation of fishing unit, calculated using a linear goal programming (LGP). Formulation and prioritization of management strategies performed with strength weakness opportunity threath analysis (SWOT), and analysis of quantitative strategic planning matrix (QSPM). Maximum sustainable yield of tuna fish resources in Buru District estimated at about 867 tons/year, with optimum fishing effort is at 1101 units/year. Fork length and weight of tuna fish caught that ranged from 85.5 to 170.8 cm (L = 180.6 cm) and 12.0 to 91.8 kg, with a range of ages 1–6 years, fishing mortality enough high, with the rate of exploitation between the years 2010–2011 has exceeded the optimum exploitation rate in the range 65% –74%, where the actual fishing effort exceeds the optimum fishing effort. Feasibility analysis of the three categories handline units conducted with business analysis and analysis of investment criteria, showed that handline units that has a good business feasibility is, the first, handline unit 5.5 HP with an annual profit of Rp10 710 407, revenue cost ratio (R/C) > 1, the payback period is 1.30 years, the value of BEP is Rp15,485,903 or 939.88 kg, with NPV value is Rp42,714,374 > 0 , IRR (84.6%) > 12% and Net B/C (4.06) > 1. Second, handline unit 15 HP with an annual profit of Rp15,164,117, revenue cost ratio of 1.14, the payback period is 2.37 years ,
Keyword: Buru District, management strategies, optimal and sustainable, tuna fisheries

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology