Judul: Analisis Kelembagaan dan Strategi Peningkatan Kinerja Kluster Komoditas Kentang Kabupaten Wonosobo
Abstrak: Asean economic community (AEC) 2015 provide opportunities and new challenges have to faced in agricultural development . Goals of this research are: analizing the alternatif and dominant supply chain, human resources of agricultural institutions and formulate the strategy for perfomance improvement potatos comodity in this area. Data analyzed by Descriptif analysis of supply chain, institutional, TOWS Analysis Strategi, and Key Perfomance Indicator based Pairwise Comparison method. The result of this study: There are 12 keys performances indicators with three priority indicators to improve perfomance of potatos: a) Enhancement the number of active farmers group as the first priority b) Enhancement the number of micro financial agribusiness institution as the second c) Enhancement amount of annual potato production as the third. There are strategy for perfomance improvement of potatos comodity based on priority indicator: 1) Increasing farmers beginner’s interest to join farmers group, 2) Improving the capacity of farmers through joint active farmer groups in improving innovation and perfomance of agricultural products, 3) Strengthen institutional farmers in managing LKMA, 4) Increasing productivity through agricultural intensification.
Keyword: Bogor Agricultural University (IPB), Supply Chain., Perfomance Improvement, Key Perfomance Indicator, Institutional

Judul: Adaptive Decision Support System For Potato Commodity Supply Chain Risk Management (Case Study: Wonosobo District)
Abstrak: Kentang merupakan salah satu komoditas unggulan di Kabupaten Wonosobo yang berpotensi untuk dikembangkan diiringi oleh pengelolaan risiko yang tepat. Penelitian ini bertujuan menganalisis kinerja rantai pasok, mengidentifikasi dan menyusun strategi mitigasi risiko rantai pasok, serta merancang model penunjang keputusan manajemen risiko rantai pasok kentang. Pengukuran kinerja rantai pasok kentang dengan pendekatan Supply Chain Operation Reference (SCOR) dan Analytical Hierarchy Process (AHP). Hasil tersebut menunjukkan bahwa tingkat kinerja untuk petani (91.93%), pengepul (93.05%), dan industri UKM (89.15%) sangat baik. Identifikasi sumber risiko dengan House of Risk (HOR) 1 dan pendekatan fuzzy Failure Mode Effect Analysis (FMEA). Hasil identifikasi didapatkan 7 sumber risiko prioritas pada petani, 5 sumber risiko prioritas pada pengepul, dan 5 sumber risiko prioritas pada industri UKM. Upaya mitigasi risiko diidentifikasi dengan pendekatan HOR 2 dan Fuzzy Inference System (FIS). Hasil menunjukkan terdapat 7 prioritas aksi mitigasi pada petani, 4 prioritas aksi mitigasi pada pengepul, dan 5 prioritas aksi mitigasi pada industri UKM. Penyusunan strategi mitigasi risiko dengan fuzzy AHP menunjukkan 3 aksi mitigasi terpenting yaitu 3 aksi mitigasi pada petani. Model sistem penunjang pengambilan keputusan merupakan pemodelan berorientasi objek yang dapat membantu pengguna dalam melakukan evaluasi kinerja dan pengambilan keputusan dalam manajemen risiko rantai pasok yang lebih efisien., Potatoes are one of the leading commodities in Wonosobo Regency which have the potential to be developed with good risk management. This study aims to analyze supply chain performance, identify and develop supply chain risk mitigation strategies, and design a decision support model for the management of potato supply chain risk. Measuring the performance of the potato supply chain using the Supply Chain Operation Reference (SCOR) and Analytical Hierarchy Process (AHP) approach. These results indicate that the level of performance for farmers (91.93%), collectors (93.05%), and the industry (89.15%) is very good. The risk agent identification was done by using House of Risk (HOR) and fuzzy Failure Mode Effect Analysis (FMEA) approach. It found 7 priority risk agents in farmer’s level, 5 risk agents in collector’s level, and 5 risk agent in industries level. HOR 2 and Fuzzy Inference System (FIS) approaches were used in identifying risk mitigation. The result showed there were 7 preventive acton priorities to the farmers, 4 priority mitigation action on the collectors, and 5 priority mitigation action on the industry. The formulation of risk mitigation strategies using fuzzy AHP shows the 3 most important mitigation actions that can be implemented. The decision support system model is an object-oriented modeling that can assist users in evaluating performance and making decisions in a more efficient supply chain risk management.
Keyword: Decision support system, fuzzy analysis, potato, supply chain performance, supply chain risk

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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