Judul: The Vertical Profile of Dissolved Oxygen in Jatigede Reservoir, Sumedang, West Java
Abstrak: Waduk merupakan perairan yang relatif tenang dan dalam. Konsentrasi DO pada waduk umumnya akan mengalami penurunan seiring dengan bertambahnya kedalaman. Penelitian ini bertujuan menganalisis profil kandungan oksigen terlarut secara vertikal dan kaitannya dengan profil fisika-kimia secara vertikal di perairan Waduk Jatigede, Sumedang, Jawa Barat. Pengamatan dilaksanakan pada titik pengamatan yang mewakili Zona Riverin, Zona Transisi, dan Zona Lakustrin. Parameter kualitas air yang diamati meliputi DO, suhu, DHL, COD, kekeruhan, pH, kecerahan, dan kecepatan arus. Hasil pengukuran DO berkisar antara 0,3-8,3 mg L-1 yang menurun seiring dengan bertambahnya kedalaman. Suhu berkisar antara 25,9-32,4 ̊C. DHL berkisar antara 158,8-219 μS cm-1. COD berkisar antara 20,76-44,63 mg L-1. Kekeruhan berkisar antara 1,16-183 NTU. pH berkisar antara 7,68-10,93. Kecerahan berkisar antara 84- 138 cm. Kecepatan arus berkisar antara kurang dari 0,1 hingga 0,15 m s-1. Parameter fisika-kimia yang memengaruhi DO memiliki korelasi yang berbeda-beda dan keberadannya sangat fluktuatif. Kesimpulan dari penelitian ini adalah distribusi vertikal DO di Waduk Jatigede tergolong ke dalam tipe distribusi clinograde. Profil vertikal DO memiliki korelasi dengan parameter fisika-kimia perairan, terutama suhu, DHL, COD, kekeruhan, dan pH., Reservoirs are relatively calm and deep waters. The concentration of DO in the reservoir will generally decrease with the increasing depth. This study aims to analyze the profile of dissolved oxygen content vertically and its relation to the vertical physical-chemical profile in the waters of Jatigede Reservoir, Sumedang, West Java. Observations were carried out at observation points representing the Riverine Zone, Transition Zone, and Lacustrine Zone. The water quality parameters observed included DO, temperature, conductivity, COD, turbidity, pH, water transparency, and current velocity. DO measurement results ranged from 0,3-8,3 mg L-1 which decreased with increasing depth. The temperature ranged from 25,9 to 32,4 ̊ C. Conductivity ranged from 158,8 to 219 μS cm-1. COD ranged from 20,76 to 44,63 mg L-1. Turbidity ranged from 1,16 to 183 NTU. pH ranged from 7,68-10,93. Water transparency ranged from 84-138 cm. Current velocity ranged from less than 0,1 to 0,15 m s-1. The physicalchemical parameters that affect DO have different correlations and their existence is highly volatile. The conclusion of this study is the vertical distribution of DO in Jatigede Reservoir belongs to the distribution type clinograde. DO vertical profile correlates with water physical-chemical parameters, especially temperature, conductivity, COD, turbidity, and pH.
Keyword: clinograde, correlation, dissolved oxygen, Jatigede Reservoir

Judul: Spatial Distribution of Nitrogen in the Waters of Jatigede Reservoir, Sumedang, West Java
Abstrak: Materi yang masuk ke dalam perairan dapat berupa bahan organik dan anorganik yang bermuatan nitrogen. Sumber masukan nitrogen yang beragam dapat memengaruhi pola penyebaran nitrogen di Waduk. Penelitian ini bertujuan untuk menganalisis distribusi nitrogen secara spasial di perairan Waduk Jatigede, Sumedang, Jawa Barat. Penelitian dilaksanakan pada bulan Februari-April 2021. Analisis data yang digunakan berupa uji signifikansi antara lapisan dan antarawaktu, penentuan musim, kesamaan karakteristik stasiun berdasarkan kualitas air, pemetaan sebaran spasial nitrogen, dan analisis korelasi nitrogen dengan parameter kualitas air. Waduk Jatigede terdiri dari tiga zona, yaitu Zona Riverin, transisi, dan lakustrin. Konsentrasi nitrat, nitrit, dan nitrogen total tinggi di Zona Riverin pada lapisan epilimnion dan di Zona Transisi pada lapisan hipolimnion. Konsentrasi amonia tertinggi di Zona Lakustrin pada lapisan epilimnion dan hipolimnion. Terdapat hubungan antaraa nitrogen dengan parameter kualitas air seperti COD, kekeruhan, TSS, dan DO. Konsentrasi tertinggi nitrogen terjadi pada lapisan hipolimnion. Nitrogen tersebar dengan konsentrasi bervariasi secara vertikal dan cenderung seragam secara horizontal. Nitrogen memiliki tingkat konsentrasi dengan kecenderungan lebih tinggi di Zona Riverin secara horizontal dan di lapisan hipolimnion secara vertikal. Secara spasial, tingkat konsentrasi nitrogen dipengaruhi oleh COD, kekeruhan, TSS, dan DO di perairan., Materials enter waters can be form of organic and inorganic containing nitrogen. Various sources of nitrogen input which can affect nitrogen distribution pattern. This study aims to analyze the nitrogen spatial distribution in Jatigede Reservoir, Sumedang, West Java. Research carried out in February-April 2021. Analysis of data used are test of significance between layers and over time, season determination, similarity of station characteristics based on water quality, mapping of nitrogen spatial distribution, and nitrogen correlation analysis with water quality parameters. Jatigede Reservoir consists of three zones, namely riverine, transition, and lacustrine zones. Concentrations of nitrate, nitrite, and total nitrogen were high in riverine in epilimnion and in transition in hypolimnion. The highest amonia concentration was in lacustrine in epilimnion and hypolimnion. There is relationship between nitrogen and water quality parameters such as COD, turbidity, TSS, and DO. The highest nitrogen concentration occurs in hypolimnion. Nitrogen is dispered with varying concentrations vertically and tends to be uniform horizontally. Nitrogen has a concentration tend to be higher in riverine horizontally and in hypolymnion vertically. Spatially, nitrogen concentration is influenced by COD, turbidity, TSS, and DO in waters.
Keyword: distribution, Jatigede Reservoir, nitrogen

Judul: Application of Mel Frequency Cepstrum Coefficients (MFCC) as Feature Extraction on Phoneme Recognition with Probabilistic Neural Network (PNN) as Classifier
Abstrak: Voice recognition (speech recognition) is one field of study in voice processing. This technology can convert voice signals into a form of written information (text). With this technology, people can interact with a computer. MFCC feature extraction computes the cepstral coefficients by considering the human hearing. This research is a phoneme recognition using feature extraction MFCC and PNN as feature matching model. This study compares the coefficient, overlap, and the test data without noise and with noise. MFCC is used with 13, 20, 26 coefficients and 0%, 25%, 50% overlap. Noise is added by 30 dB, 20 dB and 10 dB. From the comparison of the three overlaps, produced the best accuracy at 50% overlap with an accuracy of 94,71%. From comparing the three coefficients, better accuracy resulting in coefficients of 20 and 26 with an accuracy of 97,12% at 50% overlap. After comparing between the coefficients of 20 and 26 with overlap of 25% then the coefficient 26 is obtained that better accuracy of 94,23%. This shows that in this study the coefficient 26 is the best. In this research, there are three noise variables. The variables are 10 dB, 20 dB, and 30 dB. The best accuracy reached when the noise variable is 30 dB rather than 10 dB or 20 dB because the accuracy has the closest accuracy compared by the accuracy when noise was not added into the data. When the noise variable is 30 dB, the percentage of accuracy is 85,3%.
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