Judul: Pengaruh Perubahan Penutupan/Penggunaan Lahan terhadap Karakteristik Hidrologi Sub DAS Ciliwung Hulu
Abstrak: Watershed is an ecosystem consisting of upstream, middle and downstream. Upstream watershed ecosystem is play an important role, because its function to regulate hydrologic characteristics of the watershed. Ciliwung watershed is one of the superpriority watershed that must be taken high priority effort to rehabilitation. According to Suripin (2002), hydrological components affected by development activities in the watershed includes surface flow coefficient, coefficient of discharge regim river, the ratio between maximumminimum river discharge, mud content or sedimentary deposits in the river, the rate of frequency and period of floods, and also the state of groundwater. The aim of the research is to analyze land use/cover, changes of land use/cover in upstream ciliwung watershed and to analyze its influence on watershed hydrology (flood and maximum-minimum river discharge). In this research landsat image of 1990, 2001 and 2010 was used to analyze the land use/cover changes. After that the condition of land use changes and characteristics of watershed hydrology were compared and evaluated. Based on image interpretation of land cover in 1990 and 2001, the area dominated respectively by dense jungle, mixed farms and tea plantation. While land use in 2010 is dominated respectively by dense jungle, tea plantation and settlement. Patterns of land use/cover change at period 1990-2001 indicates substantially conversion of agriculture land such as the rice field, dryland farming and mixed farms into settlements. Area that converted respectively are 238.8 ha, 238,5 ha and 127,8 ha. Bush land is transformed into agriculture land as well, which are tea plantation (180,1 ha), mixed farms (140,7 ha) and other agricultural cultivation. Mixed farms is the most intensively converted land into dryland farming (411,3 ha). In the period 2001-2010, pattern of landuse/cover changes that occured is not too different but in a much larger scale. Large conversion of agriculture land occurred toward settlement (rice field 231,3 ha, mixed farms 176,2ha and dryland farming 128,9 ha). Mixed farms was converted into dryland v farming are 329,5 ha and rice field 212,8 ha. Amount of bush land converted to tea plantation, rice field and dryland farming were respectivally 107,1 ha, 144,9 ha and 108,4 ha. A decline in the quality of the upstream ciliwung watershed hydrology can be seen from characteristic of flood frequency, the quality of a flood, maximum-minimum river discharge and the ratio between maximumminimum river discharge. Increase of settlement and dryland farming area in the upstream ciliwung watershed contribute to declining of upstream ciliwung sub watershed hydrology characteristics.
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Judul: Land Cover Change and River Discharge in the Upper Ciliwung Watershed
Abstrak: Perubahan tutupan lahan akan terus berlangsung seiring meningkatnya jumlah dan aktivitas penduduk untuk memenuhi kebutuhan akan lahan. Pada DAS Ciliwung Hulu terjadi perubahan tutupan lahan yang intensif. Perubahan tutupan lahan berpengaruh terhadap kondisi hidrologi pada DAS Ciliwung Hulu, salah satunya adalah terhadap debit aliran sungai. Tujuan dari penelitian ini adalah mengidentifikasi perubahan tutupan lahan dan mengevaluasi hubungan perubahan tutupan lahan dengan debit aliran DAS Ciliwung Hulu. Perubahan tutupan lahan dianalisis luasannya dengan metode overlay, koefisien aliran permukaan dihitung dengan menggunakan perbandingan direct run-off dengan curah hujan, dan analisis data dilakukan dengan metode regresi berganda untuk melihat hubungan perubahan tutupan lahan dengan debit aliran sungai. Hasil penelitian menunjukkan, tutupan lahan yang paling banyak mengalami perubahan di DAS Ciliwung hulu pada periode 2009 dan 2018 adalah pertanian lahan kering menjadi permukiman, yaitu seluas 1818.14 Ha. Sementara itu, nilai koefisien aliran permukaan didapatkan sebesar 0.26. Hubungan tutupan lahan secara bersama-sama terhadap debit aliran termasuk kategori cukup signifikan dengan nilai R2 sebesar 0.542. Berdasarkan hasil analisis regresi, model persamaan yang didapatkan adalah Y = 7256 – 4.03 H – 0.27 Pm + 10.9 Pk + 2.29 Pt – 13.5 Pc + 5.79 Sb.
Keyword: Land cover change, river discharge, regression analysis, upper  Ciliwung watershed

Judul: Penerapan Algoritme Genetika dalam Sistem Permainan Tebak Angka
Abstrak: The number guessing game is a modified game of mastermind created by Mordecai Meirowitz in 1970. The goal of the game is to guess a hidden sequence of numbers stored by others (human or computer) based on values obtained at each guess iteration. In this study, the game is applied into the system by using genetic algorithms, a method that has been successfully utilized to implement the mastermind game on the computer and get an effective solution for the game. Genetic algorithms work through a process of natural selection or commonly known as the evolutionary process, which will continue running until the system finds the optimal 4-digit series of numbers. The system is designed in order to guess those hidden numbers with minimal iterations using c++ programming language. The output of the program shows that the performance is determined by the first guess iteration.
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