Judul: Water Quality Evaluation for Tourism and Agricultural Feasibility at Situ Gede Sub-District of Bogor Barat, Bogor City
Abstrak: Saat ini, air yang tercemar merupakan masalah utama dalam penurunan kualitas air. Penurunan kualitas air akan menurunkan daya guna dan kapasitas sumber daya air. Tujuan penelitian ini adalah untuk menganalisis kualitas air Situ Gede dengan parameter fisika-kimia, menganalisis perubahan tata guna lahan, serta menentukan indeks pencemaran perairan. Penelitian dilakukan pengujian di lapangan untuk parameter pH, suhu, DHL, TDS dan kedalaman, serta pengujian di laboratorium untuk parameter TSS, DO, BOD, dan Nitrit. Situ Gede memiliki Indeks Pencemaran dengan kategori tercemar ringan, dimana nilai IP berada pada rentang 1-5. Analisis tata guna lahan yang dilakukan perbandingan antara peta tahun 2021 dengan tahun 2012, terdapat peningkatan permukiman dan jumlah penduduk. Suhu air berkisar antara 28,5-31,1ºC, nilai DHL berkisar antara 134,4-195,5 mmhos/cm, nilai TDS pada rentang 67,1-94 ppm dan TSS memiliki kisaran 2,75-8,25 mg/L, sedangkan parameter kimia, pH air pada kisaran 5,42-6,75, nilai DO memiliki kisaran 4,93-7,05 mg/L, nilai BOD berkisar 1,41-3,92 mg/L dan nilai nitrit berkisar 0,061-0,265 mg/L. Hasil pengujian, terdapat 2 parameter yang nlainya tidak sesuai dengan baku mutu yaitu pH dan nitrit. Hal ini dapat diakibatkan adanya hujan, adanya pembuangan sampah organik maupun anorganik di area tepi situ, adanya limbah pupuk dari pertanian, dan adanya RPH (Rumah Potong Hewan).
Keyword: parameters, testing, value, water quality

Judul: Penilaian ekonomi Situ Gede, Kelurahan Situ Gede, Kecamatan Bogor Barat, Kota Bogor
Abstrak: Situ Gede is a pond located in Bogor City, precisely in Situ Gede Village, West Bogor Sub-district, Bogor Infrastructure management of Situ Gede has not been optimalize like very few trashcan, tourism attraction and only few rest area available. Hence, the reseach about economic value of Situ Gede were made. This research is aimed for: (1) analyzing nearby citizen’s perception about Situ Gede’s environmental and management, (2)identifiying the variations of Situ Gede utilization, and (3) estimating the economic value of Situ Gede utilization. Some of kind lake utilizations that conducted in Situ Gede at this time are as fishing ground, irrigation, and tourism object. The aim of this research is to calculate Situ Gede’s economic value using market price method for the fishery utilization, cost analysis for the agricultural utilization, and travel cost method for the tourism utilization. Respondents’ perception of Situ Gede are good air quality, good water quality, beautiful scenery, poor waste disposal system around the lake, and the operations management that still has not run well. Economic valuation for the utilization of Situ Gede consist of fishery utilization which worth 2.621.740.000 IDR, agricultural utilization which worth 18.500.471 IDR, and tourism utilization which worth 1.157.062.500 IDR. Use value of Situ Gede is 3.797.302.971 IDR.
Keyword: Bogor Agricultural University, Economic  Value of Irrigated Water., Travel Cost Method, Situ Gede, Market Price Method, Valuation

Judul: Algoritme LLL dan Aplikasinya dalam Pembongkaran Sistemkripto Knapsack Merkle-Hellman
Abstrak: LLL algorithm is an algorithm that can be used to determine an approximation of the shortest vector in a lattice. Size reduction algorithm is an important step of LLL algorithm. The LLL algorithm can be applied in many elds. This paper shows how LLL algorithm can be used in breaking one of the famous cryptosystem, namely the Merkle-Hellman knapsack cryptosystem. Merkle-Hellman knapsack cryptosystem is an asymmetric cryptosystem using the subset sum problem as the support of security. Subset sum problem can be transformed into the problem of determining shortest vector in a lattice, so that LLL algorithm can also be used to solve the subset sum problem. Since the subset sum problem can be easily solved by applying LLL algorithm, then the Merkle-Hellman knapsack cryptosystem can also be easily be destructed.
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