Judul: Penyelesaian masalah optimasi linear menggunakan metode titik interior primal-dual dengan langkah newton penuh
Abstrak: Optimization is a branch of applied mathematics, which studies problems is order to find the maximum or minimum value of a function that satisfies certain constraints. Especially, a linear optimization studies things that maximizes or minimizes a linear function with linear constraints. One of the ways for solving linear optimization problems is by using interior-point method. Three are several variations of the interior-point method,but the aim this paper is to discuss the interior-point method with primal-dual full-Newton steps. This method follows a guideline called the central path. The movement of the central path are analyzed by this method and implemented with MATLAB. Simulation result shows that the central path approaches the optimal solution of a linear optimization problem.
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Judul: Analisis Perubahan Analytic Center dalam Masalah Optimasi Linear dengan Metode Interior Primal-Dual Langkah Full-Newton
Abstrak: Primal-dual interior-point method with full-Newton steps is a method for solving optimization problems. The initial point of the interior-point method converges to the so called analytic center. In this paper we discuss and explain the primal-dual interior-point method using the full-Newton step interior method and analyze changes of the analytic center of linear optimization problems with redundant constraints. The addition of infinite redundant constraints cause that the analytic center converges to another optimal solution.
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Judul: Amfibi sebagai satwa peliharaan: Ekspor, Impor dan Perdagangan Domestik
Abstrak: Indonesia has exported amphibian as frozen frog legs (listed since 1969 under fishery product) for consumption and live amphibian (listed since 1983 under reptilian class in forestry product) for pets. There are also live amphibian trading in local level i.e in markets and malls. This research aims to identify amphibian species exported and imported by investigating document from related administration and to identify amphibian species traded in domestic market by observation at Jakarta. Research is primarily conducted by processing quota data taken from Department of Forestry Republic of Indonesia database in Jakarta. Market observation was carried out in 18 locations (3 markets and 15 malls) in Jakarta. I carried out interview with trader and export business, which related to net trading live amphibians for pets. Respondent was choosen using snowball sampling manner. Name of species is written according to Iskandar & Coljin (2000). If there is no such record in the checklist (for example species are from outside Indonesia), then the species name is written according to Frost (2004). There are 56 species from eight families of wild amphibians that have pets quota between 1998-2008. Nineteen species was traded since 1983. The highest export quota is Litoria caerulea (21,37%). Allocation of highest catching quota is for BKSDA Jayapura (20,40%) and BKSDA Papua Barat (18,96%). Four species are included in IUCN Red List categories as vulnerable, among others are Limnonectes macrodon, Meristogenys jerboa, Nyctixalus margaritifer and Rhacophorus margaritifer. The number of amphibians that have export realization are 39 species. Two species of amphibian, Leptobrachium hasseltii and Rhacophorus margaritifer are amphibian species whose been known infected by chytrid fungus in the wild. The biggest species exported is Litoria caerulea (54,34%). Between 1983-1991, the biggest import amphibian for pets from Indonesia (66,13%) is Netherlands. Number of quota was relative stable in the last eight years, where as the number of export realization is more fluctuates. Amphibian species imported and re-exported between 1983-2008 come from Africa, South Asia, Malaysian, Archipelago Oceania, North America, Central America and South America. The number of pet amphibian species traded at domestic market is less than exported. Data showed that Indonesia imports 15 amphibian species between 1983-2008, However I found different species in the market that was unrecorded in the Ministry of Forestry data, which is the Fire Belly Salamander.
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