Judul: Aplikasi AGNPS untuk Menganalisis Kualitas Air Sungai Ciujung Kabupaten Serang, Banten
Abstrak: The water quality of river is affected by quality of water supply from the catchment area. The quality of water supply from catcment area associated with human activity. Human activities that affect the water quality also occured in Ciujung watershed in Banten Province. In this research, the decline of water quality from agricultural activities. Agricultural land in this watershed still large. The objective of this research is to analyze the water quality based on N, P, and COD parameters by using AGNPS. This application is a model that used to simulate and nutrient transport in catchment area. The methods that has been done is the gridding phase. The result showed that the water quality of Ciujung has descreased because of the organic matter. In the existing condition of the river, BOD, COD, DO, Cu and Cr parameters not contained the criteria of water quality class II. Based on the results of AGNPS simulation model, COD, N and P water quuality fits the criteria for class II based for agricultural activity
Keyword: Ciujung River, Water Quality, AGNPS

Judul: Analisis Kualitas Air Sungai Ciujung Menggunakan Model WASP (Water Quality Analysis Simulation Program)
Abstrak: Ciujung, which is the main river in the province of Banten is now being a national issue because of its pollution. A variety of landuse activities in the watershed area of Ciujung, such as settlements, agricultural, livestock and industry is estimated to have affected in the water quality of Ciujung. This study aims to analyze the water quality parameters in Ciujung by WASP model of physical chemistry. Water quality analysis is done by comparing the water quality of Ciujung with WASP model simulation results with the river water quality standards as Peraturan Pemerintah Nomor 82 Tahun 2001. Water quality Ciujung based on WASP model simulation results shows at minimum and maximum flows, for BOD, DO, ammonia, and phosphorus parameters the water quality does not meet the criteria for class II, while nitrate still contains the water quality criteria for class II. The average value of BOD, DO, nitrate, ammonia, and phosphorus on consecutive minimum discharge was 8.68 mg/L, 5.83 mg/L, 0.33 mg/L, 0.18 mg/ , and 0.06 mg/L. The average value of BOD, DO, nitrate, ammonia, and phosphorus on successive maximum discharge was 4.04 mg/L, 3.57 mg/L, 0.44 mg/L, 0.41 mg/L, and 0.18 mg/L
Keyword: Ciujung river, WASP model, water quality, Pollution loads

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.
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