Judul: Daya Saing Kopi Arabika Java Preanger di Desa Suntenjaya Kecamatan Lembang Kabupaten Bandung Barat
Abstrak: Kopi (Coffea Spp L) termasuk komoditas utama dan unggulan perkebunan yang memiliki nilai ekonomis tinggi. Desa Suntenjaya Kecamatan Lembang Kabupaten Bandung Barat, menjadi salah satu penghasil Kopi Arabika Java Preanger (KAJP) di Jawa Barat. Petani kopi arabika Java Preanger menggunakan pupuk subsidi dari pemerintah, sehingga faktor biaya input tradable akan berpengaruh terhadap keunggulan kompetitif maupun komparatif budidaya kopi arabika Java Preanger. Penelitian ini bertujuan untuk (1) menganalisis keunggulan kompetitif dan komparatif komoditas kopi arabika Java Preanger di Desa Suntenjaya, (2) menganalisis dampak kebijakan pupuk subsidi pemerintah terhadap daya saing kopi arabika Java Preanger di Desa Suntenjaya. Penelitian ini menggunakan metode Policy Analysis Matrix (PAM). Hasil analisis PAM menunjukkan bahwa usaha tani kopi arabika Java Preanger di Desa Suntenjaya memiliki keunggulan kompetitif ditunjukkan dari nilai PCR (Private Cost Ratio) sebesar 0,486 dan memiliki keunggulan komparatif ditunjukkan dari nilai DRC (Domestic Ratio Cost) sebesar 0,054, serta dengan adanya subsidi pupuk dari pemerintah berpengaruh
Keyword: Java Preanger, Komparatif, Kompetitif, PAM

Judul: Supply Chain and Value Added Analysis of Arabica Java Preanger Coffee in Suntenjaya Village Lembang District
Abstrak: Desa Suntenjaya menghasilkan single origin Kopi Arabika Java Preanger dengan nama “Bell Stone”. Ketidakefisienan rantai pasok menyebabkan keuntungan petani cenderung rendah. Penelitian ini bertujuan untuk (1) menganalisis rantai pasok Kopi Arabika Java Preanger, (2) menganalisis kinerja rantai pasok Kopi Arabika Java Preanger, (3) menganalisis nilai tambah Kopi Arabika Java Preanger pada pengolah kopi. Penelitian ini menggunakan kerangka Food Supply Chain Network untuk menganalisis rantai pasok, analisis margin pemasaran, farmer’s share, dan B/C rasio untuk menganalisis kinerja rantai pasok, dan metode Hayami untuk menganalisis nilai tambah. Berdasarkan hasil penelitian, rantai pasok Kopi Arabika Java Preanger memiliki sasaran pasar dengan target yang jelas. Saluran satu relatif lebih efisien dengan margin terendah dan farmer’s share tertinggi masing-masing 97% dan 3% dengan B/C rasio sebesar 1,08 yang tersebar merata ke setiap lembaga pemasaran. nilai tambah terbesar dimiliki oleh Marlem Coffee yaitu sebesar Rp 23.980,88/kg dan keuntungan sebesar Rp 23.461,23/kg. Kata kunci: B/C rasio, farmer’s share, food supply chain network, margin pemasaran, metode Hayami Suntenjaya Village produces single origin Arabica Java Preanger Coffee with the name is “Bell Stone”. Supply chain inefficiency is cause farmer’s profit become low. This research aims to (1) analyze the supply chain of Arabica Java Preanger Coffee, (2) analyze the performance supply chain of Arabica Java Preanger Coffee, (3) analyze value added of Arabica Java Preanger Coffee in coffee processor. Analysis supply chain of Arabica Java Preanger Coffee through the Food Supply Chain Network framework. Supply chain performance is measured by marketing margins, farmer’s share, benefit and cost ratio. Value added aspect was analyzed by the Hayami method. The Food Supply Chain Network framework show that in general supply chain of Arabica Java Preanger Coffee has the target market with clear target. Channel 1 is relatively more efficient than other channels with the lowest margin and the highest farmer’s share of 97% and 3% with the ratio of benefit is 1,08 and cost spread evenly. The result show that Marlem Coffee has the highest value added and profit of Rp 23.980,88/kg and Rp 23.461,23/kg. Keywords: B/C rasio, farmer’s share, food supply chain network, margin marketing, Hayami method.
Keyword: B/C rasio, farmer’s share, food supply chain network, margin pemasaran, metode Hayami

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