Judul: The Relationship between Plankton Volume Backscattering Strength (SV) and Environmental Parameters on Menjangan Island, West Bali
Abstrak: Plankton merupakan organisme kecil yang hidup melayang pada kolom perairan. Plankton dibagi menjadi fitoplankton dan zooplankton, plankton dijadikan sebuah indikator untuk melihat kondisi perairan. Peran plankton menjadi salah satu faktor penting untuk diketahui, salah satu metode yang dapat digunakan yaitu metode hidroakustik, dengan metode akustik maka dapat diketahui besar nilai hambur balik plankton. Penelitian ini bertujuan untuk menganalisis dan memetakan sebaran nilai SV plankton yang terdapat di Pulau Menjangan, Bali Barat dengan metode hidroakustik serta mengkaji hubungan nilai SV plankton dengan parameter lingkungan di perairan Pulau Menjangan, Bali Barat. Penelitian ini menggunakan alat instrumen SIMRAD EK-15 Data akustik berupa tampilan echogram kemudian diolah menggunakan software Echoview dengan menggunakan threshold -70 dB sampai -100 dB. Data echogram yang diperoleh dari software echoview diesktrak dalam bentuk data excel. Hasil nilai plankton dilakukan pengolahan secara horizontal dan vertikal. Nilai SV plankton secara horizontal yang dominan yaitu pada rentang -82,15 dB hingga -79,15. Kelimpahan nilai SV plankton tergolong tinggi sedangkan nilai SV plankton secara vertikal nilai SV terbesar dapat ditemukan pada kedalaman 35 m dengan nilai SV sebesar -77,126 dB. Hubungan antara SV plankton dengan parameter lingkungan dianalisis menggunakan metode regresi polinomial., Plankton, which refer to tiny organisms that float in bodies of water, can be classified into two main categories: phytoplankton and zooplankton. These organisms serve as important indicators for assessing water conditions. Understanding the role of plankton is of utmost importance, and one method used to study them is the hydroacoustic method. This particular method involves the use of acoustic technology to determine the backscatter value of plankton. The primary objective of this research is to analyze and map the distribution of plankton backscatter values (SV) on Menjangan Island, located in West Bali, using the hydroacoustic method. Furthermore, the study aims to investigate the relationship between plankton backscatter values and various environmental parameters in the waters surrounding Menjangan Island, West Bali. To conduct this research, the SIMRAD EK-15 instrument is employed. The acoustic data is visualized as an echogram and processed using Echoview software. During processing, a variable threshold ranging from -70 dB to -100 dB is applied. The resulting echogram data is then extracted as Excel data. The plankton backscatter values are analyzed both horizontally and vertically. The predominant horizontal plankton backscatter values range from -82.15 dB to -79.15 dB, indicating a relatively high abundance of plankton. The highest vertical backscatter value for plankton, -77.126 dB, is found at a depth of 35 meters. The relationship between plankton backscatter values and the environmental parameters is analyzed using the polynomial regression method.
Keyword: vertikal, horizontal, SV Plankton, Regresi Polinomial

Judul: Hubungan Nilai Volume Backscattering Strength (SV) Plankton dengan Parameter Lingkungan di Perairan Rokan Hilir Bengkalis, Riau
Abstrak: The abundance of fish resource of a water area closely related to the existence of the food resource of the waters. One of the food resources here is plankton organism. The life cycle of plankton, as one of waters organisms, depends on the physical condition of the waters. Measuring the plankton abundance conventionally can use an instrument named planktonnet. However, that method has a weakness in giving spatial information of a wide area, because there will be some areas that is not taken. Better information in spatial and temporal of the Plankton can be given by taking the data acousticly. Acoustic method gives different information, because it can apply directly on the layer waters that will be analyzed. The aim of this research is to see the distribution of Plankton temporally and spatially based on the spread return value, the abundance of plankton net, physical parameter in Rokan Hilir Bengkalis Riau waters. The value of SV tends higher both temporally in the second day and spatially in station 4. The high SV values which dominate are -67,00 and -68,00 dB, that is found the most spatially in Station 4 on the second day at 7 until 8 a.m. It is proper with the abundance of plankton value by using plankton-net, the Station 4 tends higher. The higher plankton abundance is supported by environment parameter, which gives enough influence at every station on the research location. It is proved by the information of axis 1 (F1) and axis 2 (F2) that is 70,29%, moreover the matrix correlation between each parameter gives both positive and negative contribution
Keyword: Volume Backscattering Strangeth (SV) Plankton., Methods Acoustic, Plankton

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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