Judul: Kajian beban pencemaran dan daya tamping pencemaran sungai Ciliwung di segmen Kota Bogor
Abstrak: Perkembangan kependudukan di DAS Ciliwung Segmen Kota Bogor mendorong peningkatan kebutuhan hidup sehingga bermunculan berbagai macam industri dan peternakan. Sungai Ciliwung sebagai ekosistem terbuka menerima beban pencemaran melalui saluran-saluran air dari berbagai sumber pencemar seperti limbah rumah tangga, industri, peternakan dan pertanian. Disamping itu, pemanfaatan air sungai Ciliwung oleh masyarakat juga menyebabkan penurunan kualitas dan mutu air sungai. Untuk itu perlu dilakukan inventarisasi dan pemetaan industri-industri serta peternakan dengan menggunakan SIG sebagai dasar upaya pengendalian pencemaran Sungai Ciliwung secara keseluruhan.
Keyword: 

Judul: The development of Land Use and Water Quality of  the Ciliwung River Segment of Bogor City During the 2013-2019 Period
Abstrak: Perubahan lahan di Sungai Ciliwung segmen Kota Bogor cenderung memperluas lahan permukiman dan industri, dan semakin menggeser lahan pertanian dan peternakan. Pergeseran penggunaan lahan tersebut merubah besarnya beban pencemaran yang ditimbulkan sehingga mengakibatkan perubahan kualitas air Sungai Ciliwung. Tujuan penelitian adalah mengkaji perubahan penggunaan lahan Sungai Ciliwung di wilayah Kota Bogor, mengetahui besarnya beban pencemaran Sungai Ciliwung segmen Kota Bogor, serta dampak perubahan penggunaan lahan dan beban pencemaran terhadap kualitas air. Hasil analisis menunjukkan kualitas air sungai dalam kategori cemar sedang hingga berat, dengan parameter BOD, COD dan total fosfat yang melampaui baku mutu air kelas II. Potensi beban pencemaran tertinggi berasal dari limbah domestik, disamping sumber-sumber lainnya seperti pertanian, peternakan, dan industri. Beban pencemaran tersebut menyebabkan penurunan kualitas air Sungai Ciliwung segmen Kota Bogor, sehingga hingga saat ini selalu melebihi baku mutu air kelas II yang telah ditargetkan., Land changes in the Ciliwung river in the Bogor city segment tend to expand residential and industrial area and shifting agricultural land and farms. The shift in land use changed the amount of pollution burden caused resulting in changes in the water quality of the Ciliwung River. The purpose of the research is to assess the change in the use of river ciliwung in the Bogor City area, to know the magnitude of the ciliwung river's burden of Bogor City, and the impact of changes in land use and pollution burden on water quality. The results of the analysis showed the river water quality in the category of moderate to heavy pollutants, with parameters BOD, COD and Total Phosphate exceeding the standard of water quality class II. The highest potential pollution burden comes from domestic waste, besides agriculture, farming, and industry. The pollution burden caused a reduction of the water quality of the Ciliwung River segment of Bogor City so that until now it has always exceeded the standard quality of class II that has been targeted.
Keyword: beban pencemaran, kualitas air, penggunaan lahan, land use, pollution burden, water quality

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: