Judul: Status Kualitas Air Sungai Ciambulawung, Banten
Abstrak: Ciambulawung River is located in the village of Hegarmanah, in the Sub-district of Cibeber, Lebak Regency, Banten Province. Communities around the Ciambulawung River using the river for several purposes such as irrigation farming, settlement activities and micro-hydro. The community activities around the river is a major factor in contributing the sewage into the river. The purpose of this study was to determine the water quality status of Ciambulawung River using water pollution index and NSF WQI. This research examines the physical and chemical parameters of waters with water quality index approach. Analysis of water quality parameters is conducted in the field and laboratory. The advanced data calculations of water quality parameters is done by using Pollution Index and NSF WQI. The pollution index ranged 0.56 to 0.78 and NSF WQI ranged 87-88. Hence these waters are classified as good. Based on pollution index and NSF WQI index it is stated that communities as well as micro-hydro activities do not negatively affect the water quality of Ciambulawung River.
Keyword: Ciambulawung River., NSF WQI, water quality, Pollution Index

Judul: Water Quality and Pollution Load in Ciwidey Sub-Watershed
Abstrak: Sungai Ciwidey merupakan salah satu hulu Sungai Citarum yang berada di wilayah Kabupaten Bandung. Pertumbuhan penduduk dan penggunaan lahan di Sub-DAS Ciwidey menyebabkan perubahan pada parameter kualitas air Sungai Ciwidey, terutama di bagian hilirnya. Penelitian ini bertujuan menganalisis kualitas air, besarnya beban pencemaran, total beban pencemaran dan pengaruhnya terhadap kualitas air di Sub-DAS Ciwidey. Analisis hasil pemantauan kualitas air Sungai Ciwidey dibandingkan dengan baku mutu kelas I. Besarnya beban pencemaran dihitung menggunakan metode rapid assessment. Analisis kualitas air menunjukkan pencemaran bahan organik dengan indikasi tingginya nilai biological oxygen demand (BOD), chemical oxygen demand (COD), dan fecal coliform. Parameter lain yang melebihi baku mutu adalah total suspended solid (TSS), total fosfat, besi (Fe), mangan (Mn), seng (Zn), dan detergen total. Beban pencemaran terbesar berasal dari kegiatan industri. Total beban pencemaran sebesar BOD 70,9672 ton/bulan; COD 116,6503 ton/bulan; TSS 45,3445 ton/bulan; total nitrate (TN) 0,0387 ton/bulan; dan total phosphate (TP) 0,0172 ton/bulan. Konsentrasi beban pencemar terbesar terhadap debit air terjadi pada bulan Agustus dan terkecil pada bulan Januari., Ciwidey River is one of the headwaters of the Citarum River in Bandung Regency area. Population growth and land use in Ciwidey Sub-watershed have caused changes in the water quality parameters of the Ciwidey River, especially in the downstream part. This research aims to analyze water quality, the magnitude of the pollution load, total pollution load and its effect on water quality in the Ciwidey Sub-watershed. Analysis of the results of monitoring water quality of Ciwidey River compared to class I quality standards. Meanwhile, pollution load was calculated using rapid assessment method. Water quality analysis shows organic material pollution with indicate by high biological oxygen demand (BOD), chemical oxygen demand COD and fecal coliform values. Other parameters that exceed quality standards are total suspended solid (TSS), total phosphate, iron (Fe), manganese (Mn), zinc (Zn), and total detergent. The largest pollution load comes from industrial factories with BOD 70,9672 tons/month; COD 116,6503 tons/month; TSS 45,3445 tons/month; total nitrate (TN) 0,0387 tons/month; and total phosphate (TP) 0,0172 tons/month. The largest concentration of pollutant loads to water discharge occurs in August and the smallest in January.
Keyword: baku mutu, limbah, pencemaran air

Judul: Penggunaan Trie dalam Membangun Frequent ltemset Menggunakan Algoritmc FPGrowth
Abstrak: FP-growth algorithm search for frequent itemset using the FP-tree data structure which is a prefix tree structure based on pattern growth algorithm. Prefix tree in FP-Growth uses the trie structure in the relationship pattern among the items in the database. Trie is a tree structure that uses strings as key, where each descendant represents a character or prefix. To find frequent itemset, FP-growth algorithm build prefix tree recursively. However, recursive function may need longer time than the Iterative (Manolopoulos 2003). Goal of this research is to create alternatives iteratively to the development of frequent iternset using trie on the FP-Growth. Research was conducted on several stages for the development of the frequent itcmset using a trie, stage through pruning and without pruning. In the last stages of testing is done using the input parameters, enter the difference in support, the number of transactions, and the items involved. Testing stage compare the execution time in the computing process through the stage with pruning and without pruning. Thing that affects the execution time is the number of items involved in development process of the frequent itemset. Frequent itemset development with the pruning process will he faster than without pruning, hecause at the time to build a combination of frequent itemset, infrequent items are not in the development process.
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