Judul: Soil Moisture Content Based on Field Sampling and Soil Moisture Active Passive (SMAP) Analysis
Abstrak: Pengukuran kadar air tanah dapat dilakukan dengan dua cara, yaitu langsung dan tidak langsung. Pengukuran menggunakan metode langsung membutuhkan waktu yang relatif cukup lama dan terbatas, sedangkan pengukuran menggunakan metode tidak langsung dapat mengidentifikasi pada cakupan wilayah yang lebih luas dengan waktu yang singkat serta dapat memperoleh data pada waktu pengamatan yang real time dan human error yang kecil dibandingkan data pengamatan di lapangan. Pemetaan data kadar air tanah hasil penginderaan jauh masih belum banyak dilakukan di Indonesia sehingga menyebabkan kurang terobservasinya pengukuran kadar air tanah dengan teknologi penginderaan jauh yang salah satunya dapat menggunakan Soil Moisture Active Passive (SMAP). Penelitian ini bertujuan membandingkan pola kadar air tanah melalui analisis data Soil Moisture Active Passive (SMAP) dengan pola kadar air data pengamatan lapang. Penelitian ini menggunakan SMAP yang termasuk dalam satelit jenis Synthetic Aperture Radar (SAR) dengan memiliki gelombang mikro yang sangat sensitif terhadap kadar air tanah. Satelit ini menggunakan kombinasi penginderaan jauh gelombang mikro aktif (radar L-band) dan pasif (radiometer L-band) untuk pemetaan kadar air tanah. Data kadar air tanah SMAP merekam data setiap 3 jam pada grid global 9 km. Evaluasi pengukuran kadar air SMAP dilakukan dengan menggunakan hasil pengamatan langsung di lapangan. Hasil uji statistik R2 dan (Nash-Sutcliffe-Efficiency) NSE menunjukkan bahwa pola data kadar air SMAP mendekati pola kadar air lapang.
Keyword: L-band, SMAP, Soil moisture, Spasial resolution.

Judul: Identifikasi Kelembaban Tanah dengan Pemanfaatan Gelombang Mikro Sensor PALSAR Satelit ALOS (Studi Kasus Kabupaten Bekasi dan Sekitarnya)
Abstrak: Soil moisture one of important factor in determining the level of dryness of the land. Therefore, monitoring the characteristics of spatial and temporal distribution of soil moisture is essential. Effective method for monitoring soil moisture on a large scale is by remote sensing. This research using the image of the PALSAR ALOS satellite which is a type of SAR (Synthetic Aperture Radar) that is sensitive to soil moisture content. Detection of soil moisture content was obtained based on the dielectric constant values that derived from values of backscatter of radar image. The purpose of this research is to study the characteristics and identify the soil moisture levels in some areas land cover Bekasi District and it’s surrounding using PALSAR ALOS satellite imagery. There are two empirical models used in soil moisture model prediction, they are the Dubois and top models. Both methods are suitable for open areas with a relatively flat surface. Dubois used to predict the value of dielectric constant and surface roughness, on the other hand the Top models used to predict soil moisture based on the value of the dielectric constant. This research tried to study the six types of land cover of water bodies, paddy fields, fallow paddy fields, open land, the land building, and land vegetation. The results showed that the highest dielectric constant values are found in water bodies with an average value of 7.9 and the lowest is in the fallow paddy field with an average value of 5.2. The highest soil moisture values are found in the land of vegetation with an average value of 25% and the lowest is in the fallow paddy field with a value of 20%.
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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.
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