Judul: Analisis Risiko Produksi Ikan Black Ghost di Unit Pendederan I Arifin Fish Farm Kota Bogor, Jawa Barat
Abstrak: Apteronotus albifrons known as the black ghost fish are fish that originated from South America. One of the fish farmers who produce fish black ghost in the city of Bogor is Mr. Arifin. Each production cycle fluctuations fish survival rate, this indicated the existence of risk. The purpose of this study is (1). identify risks faced by Mr. Arifin production in units of fish nursery I blackghost (2). analyzing the probability and impact of risk sources encountered Mr. Arifin in unit nursery I fish black ghost. (3). determine appropriate strategies to address the risks faced by Mr. Arifin production in the nursery unit I fish black ghost. Data obtained from field observation and interviews with business owners. Then the data were analyzed with descriptive methods and risk analysis. Results obtained by analysis of sources of risk in Arifin fish farm is changes in water quality, and fish disease attacking each other. Value of the probability and impact of each risk is 43,3% change in water quality and Rp 1,060,436, the disease was 48,0% and Rp 1,848,419, fish attacked each other at 34,5% and Rp 248,781. Sources of risk management strategies fish use to attack each other preventive strategies. Sources of risk management strategies and changes in water quality by using preventive and mitigation strategies.
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Judul: Analisis Sumber Sumber Risiko Produksi Pembenihan Ikan Patin Siam pada Pasir Gaok Fish Farm di Kabupaten Bogor
Abstrak: Siam’s catfish is potential commodity which can develop in Indonesia. This commodity has been developed by Pasir Gaok Fish Farm (PGFF). PGFF faces the production risk as indicated by the production fluctuation and enhancement of catfish seed mortality. The purpose of this study are to identify the sources of production risk, analyze the probability, impact of risks, and alternative strategies. The data was analyzed with descriptive analysis, z-score analysis, and analysis of Value at Risk (VaR). The results showed that prodution risks of siam’s catfish in PGFF are cannibalism, diseases, water quality, and human error. Probability value of each highest risk source consist of cannibalism, diseases, water quality, and human error. The impact of the each highest production risk arerisk of disease, cannibalism, water quality, and human error. Based on the probability and impact of risk, prevention strategies needed to be implemented to solve the risk of cannibalism and disease with giving fresh natural food according to the needs of fish and right time.
Keyword: Bogor Agricultural University (IPB), z-score, value at risk, siam catfish, production risk, pasirgaok

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology