Judul: Perbandingan Waktu Eksekusi Metode Titik Interior dalam Menyelesaikan Masalah Optimisasi Linier menggunakan Mathematica dan Scilab
Abstrak: Terdapat dua metode yang biasa digunakan untuk menyelesaikan optimisasi linier, yaitu metode titik interior dan metode simpleks. Pada metode titik interior, pergerakan titik-titik menuju solusi optimal melewati bagian dalam daerah fisibel. Sedangkan pada metode simpleks, pergerakan titik-titik terjadi sepanjang simpul polihedron. Pada karya ilmiah ini, dilakukan perbandingan waktu eksekusi metode titik interior dalam menyelesaikan optimisasi linier menggunakan perangkat lunak matematika, yaitu Mathematica dan Scilab. Variabel dan kendala dari masalah optimisasi linier dipilih beragam dari kasus yang relatif sedikit ke kasus yang relatif banyak. Hasil yang diperoleh menunjukkan bahwa waktu eksekusi metode titik interior menggunakan Mathematica cenderung lebih cepat dibandingkan metode titik interior menggunakan Scilab untuk semua kasus optimisasi linier dengan ukuran beragam.
Keyword: mathematica, metode karmarkar, metode titik interior, optimisasi linier, scilab, waktu eksekusi

Judul: Perbandingan Waktu Eksekusi Metode Simpleks dan Metode Titik Interior dalam Menyelesaikan Masalah Optimasi Linear Menggunakan Mathematica
Abstrak: There are two famous methods for solving linear optimization problems, namely simplex method and interior point method. In the simplex method, to find an optimal solution, the algorithm moves from vertex to vertex. While in the interior point method, the algorithm moves in the interior of the feasible region of the problem. In this paper we compare the execution time of the simplex method and the interior point method in solving several linear optimization problems by using a mathematical software, that is Mathematica. The size of problems are chosen from small to relatively big. The main result is that the interior point method is faster than the simplex method for big size problems
Keyword: execution time, linear optimization, interior point method, simplex method

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.
Keyword: