Judul: Analisis Sebaran Klorofil-a dan Suhu Permukaan Laut Menggunakan Data Satelit Aqua Modis di Laut Jawa
Abstrak: Laut Jawa memiliki potensi sumber daya ikan yang besar. Suhu permukaan laut dan konsentrasi klorofil-a merupakan parameter oseanografi yang dapat mempengaruhi persebaran ikan. Penggunaan parameter ini dapat menganalisis sebaran suhu permukaan laut dan kloofil-a dengan memanfaatan teknologi penginderaan jauh. Tujuan penelitian ini untuk menganalisis sebaran klorofil-a dan suhu permukaan laut menggunakan sensor satelit Aqua Modis di Laut Jawa pada Tahun 2020.Penelitian ini berlokasi di perairan Laut Jawa menggunakan data citra Aqua MODIS bulanan selama tahun 2020. Penentuan nilai konsentrasi klorofil-a dan suhu permukaan laut yang sebelumnya telah diolah menggunakan interpolasi Inverse Distance Weighted (IDW). Analisis sebaran SPL rata-rata bulanan di Laut Jawa dari citra satelit Aqua MODIS tahun 2020 berkisar antara 28.5°C – 30.9°C. Penyebaran SPL di Laut Jawa mengikuti pola angin musim yang terjadi di perairan Indonesia dimana SPL cenderung turun pada musim barat dan timur serta naik pada musim peralihan 1 dan peralihan 2. Konsentrasi klorofil-a berkisar antara 0.54-4 mg/m³. Nilai konsentrasi klorofil-a setiap bulannya berfluktuasi mengikuti musim angin yang sedang berlangsung. Kata kunci: IDW, klorofil-a, Laut Jawa, suhu permukaan laut, The Java Sea has great potential for fish resources. Sea surface temperature and chlorophyll-a concentration are oceanographic parameters that can affect the distribution of fish. The use of this parameter can analyze the distribution of sea surface temperature and chlorophyll-a by utilizing remote sensing technology. The purpose of this study was to analyze the distribution of chlorophyll-a and sea surface temperature using the Aqua Modis satellite sensor in the Java Sea in 2020. This study was located in the waters of the Java Sea using monthly Aqua MODIS image data during 2020. Determination of the value of chlorophyll-a concentration and sea surface temperature which had previously been processed using Inverse Distance Weighted (IDW) interpolation. Analysis of the monthly average SST distribution in the Java Sea from Aqua MODIS satellite imagery in 2020 ranges from 28.5°C – 30.9°C. The distribution of SST in the Java Sea follows the pattern of monsoons that occur in Indonesian waters where SST tends to decrease in the west and east seasons and rises in transitional season 1 and transition 2. The concentration of chlorophyll-a ranges from 0.54-4 mg/m³. The value of the concentration of chlorophyll-a fluctuates every month following the ongoing wind season. Keywords: chlorophyll-a, IDW, Java Sea, sea surface temperature
Keyword: chlorophyll-a, IDW, Java Sea, sea surface temperature

Judul: Distribusi Kapal Ikan dengan Lampu dan Hubungannya dengan Konsentrasi Klorofil-a dan Suhu Permukaan Laut di Laut Jawa
Abstrak: Informasi zona potensial penangkapan ikan diperlukan oleh nelayan untuk meningkatkan efisiensi usaha penangkapan ikan di perairan. Pengembangan peta zona potensial penangkapan ikan dapat dilakukan dengan mengintegrasikan data parameter oseanografi dan distribusi kapal ikan di suatu perairan menggunakan metode pengindraan jauh. Tujuan dari penelitian ini adalah untuk memetakan distribusi kapal ikan menggunakan lampu dan parameter oseanografi berupa klorofil-a dan suhu permukaan laut (SPL) di Laut Jawa pada tahun 2018. Data yang digunakan adalah data deteksi kapal dari sensor Visible Infrared Imaging Radiometer Suite (VIIRS) pada kanal Day-Night Band (Kanal DNB). Data klorofil-a dan SPL berasal dari satelit Aqua dengan sensornya yang bernama Moderate Resolution Imaging Spectroradiometer (MODIS). Jumlah rata-rata harian kapal ikan tertinggi terjadi pada bulan Agustus yaitu 1205 unit dan terendahnya terjadi pada bulan Januari yaitu 207 unit. Hasil overlay antara posisi kapal ikan dan parameter oseanografi menunjukkan bahwa distribusi kapal ikan cenderung berkumpul pada kisaran konsentrasi klorofil-a sebesar 0.2–0.4 mg/m³ dan nilai SPL sebesar 28–30°C. Kata kunci: klorofil-a, Laut Jawa, posisi kapal, suhu permukaan laut, VIIRS, Fish potential zone information is needed by fishermen to increase the efficiency of fishing business in the waters. The development of a fishing potential zone map can be done by integrating oceanographic parameter data and the distribution of fishing vessels in a sea using remote sensing methods. The purpose of this study is to map the distribution of fishing vessels using lights and oceanographic parameters in the form of chlorophyll-a and sea surface temperature (SST) in the Java Sea in 2018. The data used is ship detection data from the Visible Infrared Imaging Radiometer Suite (VIIRS) sensor. on the Day-Night Band channel (DNB Channel). Chlorophyll-a and SPL data come from the Aqua satellite with a sensor called the Moderate Resolution Imaging Spectroradiometer (MODIS). The highest daily average number of fishing vessels occurred in August, namely 1205 units and the lowest occurred in January, namely 207 units. Overlay results between fishing vessel positions and oceanographic parameters indicate that the distribution of fishing vessels tends to congregate in the chlorophyll-a concentration range of 0.2–0.4 mg/m³ and SPL values of 28–30°C. Keywords: chlorophyll-a, Java Sea, sea surface temperature, ship position, VIIRS
Keyword: chlorophyll-a, Java Sea, sea surface temperature, ship position, VIIRS

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
Keyword: