Judul: Analisis dayasaing dan aliran ekspor produk Crude Coconut Oil (CCO) Indonesia
Abstrak: Indonesia dikenal sebagai negara agraris, perekonomiannya bertumpu pada sektor pertanian. Salah satu subsektor pertanian yang menjadi andalan adalah subsektor pertanian yang menjadi andalan adalah subsektor perkebunan. Komoditi kelapa merupakan produksi terbesar kedua dalam subsektor tersebut setelah kelapa sawit. Potensi kelapa di Indonesia masih belum dimanfaatkan secara optimal. Hal ini terlihat dari ekspor produk kelapa dan olahan Indonesia yang masih didominasi produk setengah jadi berupa kopra dan crude coconut oil (CCO).
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Judul: Analysis of Competitiveness, Potential, and Factors Affecting Indonesia's Crude Coconut Oil Exports in Main Destination Countries
Abstrak: Minyak kelapa mentah merupakan produk turunan kelapa yang memiliki nilai ekonomi tinggi dan berkontribusi besar terhadap keseluruhan produk ekspor kelapa. Indonesia menjadi negara eksportir minyak kelapa mentah terbesar kedua di dunia, namun volume ekspor minyak kelapa mentah Indonesia ke negara tujuan utama menurun dalam beberapa tahun terakhir. Penelitian ini bertujuan untuk menganalisis keunggulan komparatif dan kompetitif minyak kelapa mentah Indonesia di negara tujuan utama, potensi ekspor minyak kelapa mentah serta faktor-faktor yang memengaruhi ekspor minyak kelapa mentah Indonesia di negara tujuan utama. Metode analisis yang digunakan, yaitu Revealed Comparative Advantage (RCA), Export Dynamic Product (EPD), X-Model, dan regresi data panel. Hasil estimasi RCA dan EPD menunjukkan minyak kelapa mentah Indonesia berdaya saing secara komparatif di Belanda, Malaysia, dan Amerika Serikat serta berdaya saing kompetitif di Amerika Serikat yaitu pada posisi rising star. Hasil estimasi X-Model menunjukkan minyak kelapa mentah Indonesia memiliki pasar optimis di negara Amerika Serikat. Hasil estimasi model menunjukkan bahwa variabel harga ekspor CCO Indonesia berpengaruh negatif dan signifikan, sedangkan harga ekspor CCO Filipina dan keterbukaan perdagangan berpengaruh positif signifikan terhadap volume ekspor minyak kelapa mentah Indonesia., Crude coconut oil (CCO) is coconut derivative products that has high economic value and contributes greatly to the overall export of coconut products. Indonesia is the second largest exporter of CCO in the world, but the volume of Indonesia's CCO exports to major destination countries has declined in recent years. This research aims to analyze the comparative and competitive advantages of Indonesia's CCO in the main destination country, the export potential of CCO, and the factors that affect Indonesia's CCO exports in the main destination country. The analysis methods used RCA, EPD, X-Model, and panel data model. The results of RCA and EPD estimates show that Indonesia's CCO is comparatively competitive in Netherland, Malaysia, and United States and also is competitively competitive in the United States, namely in the rising star position. X-Model estimates show that Indonesia's CCO has an optimistic market in the United States. The estimation results of the model show that the variable CCO export price for Indonesia has a negative and significant effect, while the export price for CCO for the Philippines and trade openness has a significant positive effect on the export volume of Indonesia's CCO.
Keyword: coconut derivative, EPD, panel data model, RCA, x-model

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model