Judul: Dampak Ekonomi Pencemaran Air Terhadap Perikanan Budidaya Sistem Keramba Jaring Apung (KJA) di Waduk Cirata, Kabupaten Bandung Barat
Abstrak: This research aims to analyze the economic impact of water pollution on aquaculture in Cirata Reservoir. Impact of water pollution in Cirata is declining fish productivity of floating cage aquaculture. Based on the data analysis there are 8 factors that could explain the presence of contamination in the last 5 years which has exceeded the threshold of category C (Pb, Zn, Cl2, H2S, DO, Cu, Cd, and Nitrite). Further multiple regression analysis of water quality impact on the productivity of floating cage. Showed that, only variable DO levels is statistically significant effect on productivity of floating cage. Value of economic loss is calculated based declining productivity amounting to Rp 985.485.382.718 in 2011. The results of the calculation of economic loss in the last 5 years amounting to Rp 4.219.702.954.280. There are five policys identified which were restrictions on the amount of floating cage with progressive taxation, tax collection at each floating cage aquaculture for environmental improvement costs (Rp 10/kg crops), installation of waste filter, biological cleaners, and withdrawals floating cage which are not enviromental friendly (floating made of styrofoam) and unused. AHP analysis results that the first policy priority is the installation of waste filter policy.
Keyword: 

Judul: Estimasi Nilai Kerugian Ekonomi akibat Pencemaran Air di Waduk Cirata, Wilayah Kabupaten Cianjur, Provinsi Jawa Barat
Abstrak: Cirata Reservoir is one of cascade reservoir which was built by dammed Citarum River’s flow for some purposes, such as hydropower plant, fisheries, and floating cage aquaculture. Cirata Its water quality is declining due to water pollution. This pollution causes economic losses for the users of Cirata Reservoir, those are: floating cage aquaculture farmers, fishermen, and PT. PJB UP Cirata as the management of Cirata hydropower plant. This research aims to identify the respondents’ perceptions about the water pollution use descriptive analysis and to estimate the economic losses which are caused by water pollution in Cirata Reservoir Cianjur Regency in 2013 use economic loss approach and benefit transfer method. Commonly, the respondents understand about the water pollution in reservoir and suffered by it. Based on data analysis obtained that economic loss estimation of floating cage aquaculture is IDR 427,581,110,250.00 (the biggest loss), economic loss estimation of fisheries is IDR 1,176,696,421.00, and economic loss estimation of hydropower plant is IDR 198,418,167,672.67. Therefore, total economic loss estimation due to water pollution in Cirata Reservoir Cianjur Regency in 2013 is IDR 628,175,974,343.67.
Keyword: water pollution., resource damage assessment, economic loss, Cirata Reservoir

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.
Keyword: