Judul: Analisis Supply Chain dan Lean Thinking Komoditas Brokoli di Kecamatan Cipanas, Kabupaten Cianjur, Jawa Barat
Abstrak: Broccoli is a vegetable that is potencial to be developed because it has a lot of nutrients that the body needs. Increasing demand of broccoli triggers competition among supply chain to fulfill consumer needs. Simply Fresh Organic (SFO) is a business firm in agribusiness sector which markets best quality of broccoli. However, SFO has not been able to meet consumer demand. Food Supply Chain Network analysis is conducted to find out existing condition and marketing efficiency of supply chain. The result of FSCN analysis is supply chain of organic broccoli is not efficient. Futhermore, Lean Thinking approach is conducted to find out the cause of supply chain inefficiencies. Then, the final result of Lean Thinking analysis is several alternative solutions. Briefly, proper condition and collaboration among supply chain actors and internal activity of each supply chain are required to improve marketing efficiency.
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Judul: Analisis Elemen-Elemen yang Berpengaruh pada Rantai Pasok Brokoli di PT Sayuran Siap Saji
Abstrak: One of the agricultural products that is improved in Indonesia is broccoli. The demand of broccoli in Indonesia is 101 205 tons (2010), 113 491 tons (2011), 135 837 tons (2012) and 145 079 tons (2013) (BPS 2013). PT Sayuran Siap Saji is one of the company that works on the production and marketing of broccoli. The aim for this research is to analyze the supply chain of broccoli at the company, to analyze the elements that influences the broccoli supply chain and to analyze the sub-elements that involve on each element of broccoli supply chain by observing the formation of canonical matrix and digraph. Interpretive Structural Modeling is a method used to see the correlation on each sub-element at one element. The supply chain consists of farmer, company and restaurant. The element that identified is doer, need, problem, changes, aim, indicator, activity and affected segment. On the formation of canonical matrix and digraph, most of the subelements in included to sector IV which is independent sector that means those sub-elements are the key sub-elements and every change matters on the subelement will be described carefully.
Keyword: supply chain, broccoli, ISM

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