Judul: Variabilitas Intra-musiman Mixed Layer Depth dari data CTD Argo Float di Laut Sulawesi.
Abstrak: Laut Sulawesi sebagai pintu masuk (entry portal) dari ARLINDO. Kedalaman nilai Mixed Layer Depth (MLD) dapat didasarkan pada parameter densitas. Wilayah Laut Sulawesi memiliki variabilitas intra-musiman. Tujuan penelitian ini menganalisis sinyal intra-musiman lapisan mixed layer depth dari data CTD Argo Float yang didukung oleh struktur massa air dan stratifikasi massa air dari parameter suhu, salinitas, dan densitas. Data deret waktu kemudian di analisis Bandpass filter (20-100 hari), analisis spektrum densitas energi, dan analisis Hovmoller propagansi arus zonal. Hasil penting studi ini menunjukkan bahwa Laut sulawesi terstratifikasi kedalam 3 lapisan. Laut sulawesi memiliki kedalaman lapisan tercampur pada kedalaman 0-46m, lapisan termoklin pada kedalaman 50-132m dan lapisan dalam pada kedalaman 135-300m. Ditemukan lapisan pycnoclin pada kedalaman 82-174m. Ketebalan dan kedalaman lapisan permukaan,termoklin dan lapisan dalam masing-masing parameter berbeda. North Pacific Subtropical Water (NPSW) dan North Pascific Intermediet Water (NPIW) merupakan jenis massa air yang ditemukan di wilayah kajian. Adanya energi yang signifikan dari variabel densitas pada periode 32 hari yang disebabkan oleh pergerakan arus eddies. Propagansi arus memiliki kecepatan fase rata-rata sebesar 0.25 m/s membutuhkan waktu selama 30 hari.
Keyword: Arus Zonal, CTD Argo Float,Intra-musiman, Mixed Layer Depth, Stratifikasi massa air

Judul: Seasonal Variation of Mixed Layer Depth and Thermoclin Thickness using CTD Argo Float Data in Makassar Strait
Abstrak: Selat Makassar berbatasan langsung dengan Laut Sulawesi di bagian utara dan Laut Jawa dan Laut Flores di bagian selatan, dan merupakan jalur utama Arus Lintas Indonesia (Arlindo). Sehingga stratifikasi massa air di Selat Makassar dipengaruhi oleh dinamika dari perairan laut tersebut. Penelitian ini bertujuan untuk mendeskripsikan variasi musiman dari stratifikasi massa air kedalaman lapisan tercampur dan kedalaman lapisan termoklin, dan mengidentifikasi kejadian upwelling pantai di bagian selatan Makassar. Data deret-waktu suhu salinitas kedalaman diperoleh dari pengukuran autonomus CTD Argo Float (ID 5904965) pada periode Desember 2017-November 2018. Hasil penelitian ditemukan massa air North Pacific Subtropical Water (NPSW) dan North Pacific Intermediate Water (NPIW) yang dominan di lokasi studi, dengan ciri salinitas maksimum 34,6-34,7 psu di lapisan termoklin dan salinitas minimum 34,5 psu di lapisan pertengahan. Ditemukannya massa air salinitas rendah dari Laut Jawa juga dominan dalam musim barat di lapisan dekat permukaan. Variasi musiman kedalaman lapisan tercampur di musim barat (DJF) tercatat lebih tebal sekitar 93 m, serta lapisan termoklin lebih tebal di musim timur sekitar 198 m. Perubahan ketebalan kedua lapisan tersebut diduga berkaitan dengan dinamika Arlindo Makassar dan Arus Monsun Jawa, misalnya Arlindo menguat pada musim timur sehingga lapisan termoklin menjadi tebal. Kejadian upwelling pantai pada musim timur (JJA) ditandai dengan penaikan isotherm 27°C, isohaline 34,0 psu dan isopiknal 22,0 kg/m3dari kedalaman sekitar 75 m ke permukaan laut., The Makassar Strait (MS) is directly connected to the Sulawesi Sea in the north and the Java Sea and the Flores Sea in the south, and is the main route of the Indonesian Througflow (ITF). Hence stratification of water mass in the MS is influenced by the dynamics of the sea waters. This study aims to describe seasonal variations of the mixed layer and the thermocline thickness, and to identify the ITF water masses as well as the occurrence of coastal upwelling in the southern part of the MS. Temperature-salinity-depth time series dataset were obtained from oneyear CTD Argo float measurements (ID 5904965) between December 2017- November 2018. The results show that North Pacific water origin of North Pacific Subtropical Water (NPSW) and North Pacific Intermediate Water (NPIW) are dominant, with a maximum salinity characteristic of 34.6-34.7 psu in the thermocline layer and a minimum salinity of 34.5 psu in the intermediate layer. Furthermore, near-surfave fresh Java Sea water appears to be dominant during the northwest monsoon (NWM) period. Seasonal variation of mixed layer depth much deeper (93 m) and much stronger vertical gradient of temperature and salinity due to the presence fresh Java Sea water advevted by the Java Monsoon Current during the NWM period (DJF). However, during the southeast monsoon (SEM) period the mixed layer depth is much shallower and thermocline layer is much thicker (198) m, associated with much stronger the ITF and upwelled colder water from upwelling area. The coastal upwelling event during the SEM period (JJA) in the study area is characterized by an increase of isotherm of 27°C, isohaline of 34.0 psu and isopycnal of 22.0 kg/m3 from 75 m depth to the sea surface layer.
Keyword: CTD Argo Float, ITF, Makassar Strait, Mixed Layer Depth, Thermocline Layer Thickness, Upwelling, Water Masses

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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