Judul: Studi Kaliberasi Citra Asar Envisat untuk Aplikasi Biomasa pada Hutan Tanaman Industri Pelalawan, Riau
Abstrak: Envisat (Environment Satellite) an active system of remote sensing lunched by ESA (European Space Agency) for environmental mission, carries an array of many sophisticated sensors and instruments. One of the instrument is ASAR (Asar Advanced Aperature Radar) wicha can detect changes in surface heights with sub-millimeter precision. The data that Envisat ASAR instrument gained is helpful for natural and land resource inventory, especially for a big amount of natural and land resource country, like Indonesia. The Data needs to be process. Basic Envisat SAR Toolbox (BEST) issued by ESA has a module to calibrate Envisat ASAR products, but if it is used to calibrate ASAR image that scan tripics the calibrated images will not be good enough, so it needs to be corrected throught CAL module.
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Judul: Studi pendahuluan aplikasi citra envisat asar pada hutan tanaman di Indonesia
Abstrak: Sampai akhir tahun 2000, Indonesia telah mengalokasikan lahan untuk Hutan Tanaman Industri (HTI) seluas ± 7.76 juta ha. Untuk memantau lahan seluas itu, dibutuhkan suatu alat dan metode yang cukup akurat untuk mendeteksi dan menghitung berapa banyak biomassa yang dihasilkan oleh HTI tersebut. Indonesia yang merupakan negara tropik, tingkat keawanan yang tinggi merupakan masalah utama dalam penginderaan jauh. Guna mengatasi masalah tersebut, maka dikembangkan sistem Radar yang mempunyai daya penetrasi terhadap hambatan awan. Selain itu, Radar dapat digunakan pada segala cuaca dan pada malam hari sekalipun. Penelitian ini menggunakan data citra Envisat ASAR (IMP), citra Landsat TM (band 3 dan 4), Merchantable Volume (MVOL) and Total Volume (TVOL) dari HTI di Kabupaten Pelalawan, Propinsi Riau. Pembacaan besaran intensitas pantulan dilakukan pada plot inventori pada kedua citra. Khusus untuk Envisat ASAR dilakukan dalam dua pendekatan, yaitu dengan filter dan tanpa filter. Semua hasil pembacaan pada citra dikorelasikan dengan MVOL dan TVOL, dilanjutkan dengan analisis regresi untuk memperoleh hubungan antara parameter citra dengan parameter lapangan. Hasil penelitian ini menunjukkan bahwa kenampakan visual citra yang diolah dengan filter Lee memberikan hasil yang paling baik dibandingkan terhadap filter yang lain. Berdasarkan analisis regresi diperoleh korelasi terbesar untuk biomassa terdapat (1) citra Envisat ASAR sebesar 0.40 dibandingkan 0.03 pada Landsat TM 3 untuk TVOL dan (2) citra Envisat ASAR yang menggunakan filter Gamma 5 x 5 sebesar 0.39 untuk MVOL.
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Judul: Model’s Dynamics for Lymphocytes Recovery on the HIV presence with Protease Inhibitor Therapy.
Abstrak: HIV is a member of retrovirus that especially attacks lymphocytes or white blood cells, known as CD4+ T cells. New T cells created from sources within the body such as the thymus and by proliferation of existing T cells. In this paper, influence of protease inhibitor therapy in HIV dynamics will be analyzed. The influence can be categoried in three models, which are model HIV without drug therapy, model HIV with protease inhibitor and model T cell recovery. In the models, three parameters which are uninfected cells population, infected cells population and virus population are studied. From HIV without drug therapy model it is obtained two types fixed point which are uninfected fixed point and infected fixed point. The stability of fixed point depends on basic reproduction number which is influenceed by the total number of virus produced by a cell during its lifetime. From HIV with protease inhibitor therapy model it is obtained two type fixed points. The stability of fixed point depends on basic reproduction number. Other than influenceed by the total number of virus produced by a cell during its lifetime, basic reproduction number of this model also affected by the effectiveness of a protease inhibitor. Basic reproduction number of this model is smaller than that of model HIV without drug therapy. In the model T cell recovery, new T cells created only from sources within the body, and T cells can be invulnerable to HIV infection after the therapy. From the model it is obtained only one fixed point that is uninfected fixed point. The stability of fixed point depends on basic reproduction number. The total number of virus produced by a cell during its lifetime and the effectiveness of a protease inhibitor determine the basic reproduction number. Basic reproduction number of this model is smallest than that of other models.
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