Judul: Estimasi Nilai Manfaat Ekonomi dan Willingness To Pay Masyarakat Terhadap Upaya Pelestarian Waduk Cacaban, Kabupaten Tegal, Provinsi Jawa Tengah.
Abstrak: Waduk Cacaban merupakan satu-satunya waduk yang ada di Kabupaten Tegal yang memberikan beragam manfaat yaitu sebagai penyedia air irigasi pertanian, objek wisata dan sumber perikanan. Namun saat ini sedimentasi pada Waduk Cacaban terus meningkat. Dampak dari sedimentasi Waduk Cacaban ini menjadikan volume tampungan waduk semakin berkurang, sehingga diperlukan suatu upaya pelestarian Waduk Cacaban supaya manfaat-manfaat tersebut tidak hilang. Tujuan penelitian ini adalah (1) mengidentifikasi manfaat Waduk Cacaban, (2) mengestimasi nilai manfaat ekonomi dari pemanfaatan Waduk Cacaban, (3) mengestimasi nilai willingness to pay masyarakat terhadap upaya pelestarian Waduk Cacaban. Metode yang digunakan pada penelitian ini adalah dengan Travel Cost Method (TCM), analisis biaya, harga pasar dan analisis Contingent Valuation Method(CVM). Manfaat Waduk Cacaban yaitu sebagai penyedia air irigasi, objek wisata, perikanan tangkap. Nilai manfaat ekonomi wisata sebesar Rp 6.557.407.192/tahun, nilai manfaat ekonomi irigasi sebesar Rp 2.720.247.026/tahun dan nilai manfaat ekonomi hasil perikanan tangkap di Waduk Cacaban sebesar Rp 5.439.730.451/tahun. Nilai willingness to pay masyarakat terhadap upaya pelestarian kualitas lingkungan Waduk Cacaban dan pelestariannya adalah Rp 52.234.667/bulan atau Rp 626.816.000/tahun.
Keyword: Waduk Cacaban, Travel Cost Method, analisis biaya, harga pasar, contingent valuation method

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: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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