Judul: Posisi Daya Saing dan Faktor-Faktor yang Memengaruhi Ekspor Manggis, Mangga, dan Jambu Indonesia ke Negara Tujuan Ekspor
Abstrak: Penelitian ini bertujuan untuk menganalisis daya saing dan faktor-faktor yang memengaruhi aliran ekspor manggis, mangga, dan jambu Indonesia ke negara tujuan ekspor. Penelitian ini menggunakan data time series tahun 2012 sampai 2016 pada 20 negara tujuan ekspor. Hasil analisis RCA menunjukkan bahwa manggis, mangga, dan jambu Indonesia memiliki daya saing di 11 negara tujuan ekspor yaitu Bahrain, Denmark, Perancis, Hong Kong, Kuwait, Malaysia, Oman, Qatar, Thailand, Uni Emirat Arab dan Vietnam. Hasil analisis EPD manggis, mangga, dan jambu Indonesia di pasar Bahrain dan Swiss berada pada posisi Rising Star. Di negara Amerika Serikat dan Uni Emirat Arab manggis Indonesia berada di posisi Lost Opportunity. Posisi dayasaing Falling Star di Cina, Denmark, Perancis, Jerman, Hong Kong, Italia, Kuwait, Malaysia, Oman, Qatar, Saudi Arabia, Spanyol, Thailand, dan Vietnam. Sedangkan pasar manggis, mangga, dan jambu Indonesia di negara Singapura berada pada posisi Retreat. Hasil analisis gravity model menunjukkan bahwa variabel yang berpengaruh signifikan terhadap permintaan ekspor manggis, mangga, dan jambu adalah GDP riil, nilai tukar riil, jarak ekonomi, dan harga ekspor manggis Indonesia.
Keyword: dayasaing, EPD, gravity model, RCA

Judul: Analisis Daya Saing dan Faktor-Faktor yang Memengaruhi Aliran Ekspor Mangga Indonesia ke Negara Tujuan
Abstrak: Mangoes are Indonesian local fruit which have value and volume of export that increase from 2001 to 2011. The aim of this research is to analyze the competitiveness of Indonesian local mango in global market and to determine factors which affect it to be exported to target countries. RCA method shows Indonesian mango comparative strength, comparing to some countries which are UEA, Kuwait, Saudi Arabia, Hongkong, Malaysia and Singapore. IIT method shows bilateral economic relationship between Indonesia with Malaysia and Singapore. EPD method shows comparative strength of Indonesian mangoes, “Rising Star” in Malaysian and Singaporean market, “Falling star” in UEA, Kuwait and Hongkong, “Retreat” in Saudi Arabian market. Based on estimation of Gravity Model, the factor of GDP per capita riil of target countries, economical distance, and the price of mangoes in the global market could affect significantly to the demand of export of Indonesian local mango and the factor of exchange rate of rupiah to target countries is not affecting significantly
Keyword: mangoes, gravity model, competitiveness

Judul: Penyelesaian model infeksi HIV pada sel darah Putih (T CD4+) dengan menggunakan metode perturbasi homotopi
Abstrak: Acquired immunodefficiency syndrome (AIDS) is defined as symptoms of human immune system deterioration caused by human immunodefficiency virus (HIV). The virus damages the leucocytes; therefore, once a person is infected by the HIV, his/her immune system will be paralyzed and eventually he/she will not be able to survive from any disease. HIV is transmitted in many ways, such as having unsafe sex, using unsterilized syringe and blood transfusion. Homotopy perturbation method is implemented to give approximate and analytical solutions of nonlinear ordinary differential equation systems as a model for HIV infection of CD4+ T cells. A modification of the homotopy perturbation method (HPM), based on the use of numerical solution, is proposed. Some plots are presented to show the reliability and simplycity of the homotopy perturbation method. The results obtained in this study indicate that the homotopy perturbation method is highly efficient to solve models of HIV infection of cells (T CD4+). Errors resulting from this method is so small that the solution obtained by is very close to the exact solution.
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