Judul: Hidrodinamika dan Sebaran Materi Padatan Tersuspensi di Perairan Pelawangan Barat, Segara Anakan Cilacap
Abstrak: Western outlet of Segara Anakan Lagoon is located at the southern coast of Central Java, where high sedimentation rate originated from Citanduy River take place. Observation and model approached was used to reach the aim. The properties of tides, current, salinity, temperature, bed sediment and Total Suspended Solid (TSS) were measured to understand the hydrodynamics of western outlet waters. A two-dimensional hydrodynamic model was coupled with two-dimensional transport model for TSS. The model was validated using hourly measured data of surface currents, elevation, and TSS during 26-28, June 2010. The results showed that model matched with measured data. Comparation of the model and observation have statistically error of currents pattern (RMSE 0,1037 m/s and NRMSE 20,1363%); elevation (RMSE 0,1405 m and NRMSE 11,2415%), and TSS concentration (RMSE 0,0439 kg/m3 dan NRMSE 15,0781%). TSS loaded to The Indian Ocean was 20.8777 kg/s and flux 0.0139 kg/m2/s.
Keyword: 

Judul: Modeling of Ocean Currents and Distribution of Total Suspended Solids in Citarum River Estuary
Abstrak: Sungai Citarum merupakan salah satu sungai penting di Jawa Barat yang bermuara ke Laut Jawa dengan membawa sedimen tersuspensi yang besar. Tujuan penelitian ini adalah mengkaji interaksi pola arus dan sebaran Total Suspended Solid (TSS) pada Musim Barat dan Musim Timur dengan pemodelan hidrodinamika. Model arus dan TSS yang digunakan merupakan model 2-dimensi dengan perangkat lunak OpenFlows FLOOD. Validasi hasil model pasang surut menggunakan metode Root Mean Square Error (RMSE) dengan nilai 0.10. Kecepatan arus pada Musim Barat dan Musim Timur berkisar antara 0.07 – 0.35 m/s. Arus bergerak ke arah utara dan timur laut pada saat kondisi pasang dan bergerak ke arah selatan dan barat daya pada saat kondisi surut pada kedua musim. Konsentrasi TSS tertinggi pada Musim Barat saat kondisi surut yaitu berkisar antara 560 – 575 mg/L. Konsentrasi TSS terendah pada Musim Timur saat kondisi pasang berkisar antara 80 – 120 mg/L. Tingginya konsentrasi TSS ini pada Musim Barat dipengaruhi oleh curah hujan yang lebih tinggi dengan rata-rata pada bulan Januari sebesar 23.2 mm/hari sementara pada Musim Timur hanya sebesar 7.8 mm/hari. Kata kunci: arus, curah hujan, pasang surut, Sungai Citarum, TSS., Citarum River is one of the important rivers in West Java which empties into the Java Sea carrying large suspended sediments. The purpose of this study was to examine the interaction of current patterns and distribution of Total Suspended Solid (TSS) in the West and East Monsoons with hydrodynamic modeling. The flow model and TSS used are 2-dimensional models with OpenFlows FLOOD software. Validation of the tidal model results using the Root Mean Square Error (RMSE) method with a value of 0.10. Current velocity in the West and East monsoons ranges from 0.07 – 0.35 m/s. Currents move north and northeast during high tide conditions and move south and southwest during low tide conditions in both seasons. The highest concentration of TSS is in the West Season at low tide, which is in the range of 560 – 575 mg/L. The lowest TSS concentration is in the East Season during high tide conditions ranging from 80 – 120 mg/L. The high concentration of TSS in the West Season is influenced by higher rainfall. The high concentration of TSS in the West Season is influenced by higher rainfall with an average in January of 23.2 mm/day while in the East Season it is only 7.8 mm/day. Keywords: Citarum River, current, rainfall, tide, TSS.
Keyword: Citarum River, current, rainfall, tide, TSS

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.
Keyword: