Judul: Supply Chain Efficiency Analysis of Japanese Koi Fish (Cyprinus rubrofuscus) in PT. Solaris Koi Indonesia
Abstrak: Volume impor ikan koi ke Indonesia yang lebih tinggi dari volume ekspornya berimbas pada harga ikan yang berfluktuasi, sehingga perlu adanya informasi rantai pasok jenis dan grade ikan koi yang memberikan efisiensi tertinggi dengan risiko terendah. Penelitian ini bertujuan untuk menganalisis proses, jejaring, pelaku, efisiensi, dan peluang risiko yang terdapat pada rantai pasok ikan koi asal Jepang di PT. Solaris Koi Indonesia. Pengumpulan data dilakukan dengan pengamatan langsung dan wawancara dengan metode studi kasus. Analisis data menggunakan marjin pemasaran, farmer’s share, dan metode failure mode and effect analysis (FMEA). Proses produksi ikan koi di PT. Solaris Koi Indonesia sesuai dengan SNI 7734:2011 dan karantina ikan sesuai formulir Cara Karantina Ikan yang Baik (CKIB). Rantai pasok terdiri dari 20 saluran grade A, 7 saluran grade B, dan 4 saluran grade C yang dijalankan oleh pihak pembudidaya, dealer, dealer kropyokan, dan konsumen akhir. Aliran informasi mengalir secara dua arah, sedangkan aliran harga dan produk mengalir satu arah dari hulu ke hilir. Saluran A Shusui 2, A Asagi 2, dan A Showa 1 merupakan saluran paling efisien dengan tahapan yang pendek. Variabel risiko yang berkaitan dengan harga memberikan dampak tertinggi berdasarkan analisis FMEA., The volume of koi fish imports to Indonesia is higher than the volume of exports, resulting in fluctuating fish prices, so it is necessary to know the koi fish supply chains that provide the highest efficiency with the lowest risk. This study aims to analyze the processes, networks, actors, efficiency, and risk opportunities in the Japanese koi fish supply chain at PT Solaris Koi Indonesia. Data collection was carried out by direct observation and interviews with the case study method. Data analysis uses marketing margin, farmer's share, and failure mode and effect analysis (FMEA) method. The koi fish production process at PT Solaris Koi Indonesia is in accordance with SNI 7734:2011 and fish quarantine according to the CKIB form. The supply chain consists of 20 grade A channels, 7 grade B channels, and 4 grade C channels run by the farmer, dealers, kropyokan dealers, and end consumers. Information flow is bidirectional, while price and product flow are one-way from upstream to downstream. Channels A Shusui 2, A Asagi 2, and A Showa 1 are the most efficient channels with the shortest stages. Risk variables related to price have the highest impact based on FMEA analysis.
Keyword: efficiency analysis, koi, production, risk analysis, supply chain

Judul: Analisis Efisiensi Faktor yang Mempengaruhi Produksi Ikan Koi di Kecamatan Cisaat Kabupaten Sukabumi
Abstrak: Koi fish (Cyprinus carpio) is a leading commodity of freshwater fish that attracted many people. Koi fish is not only kept by hobiis but also it’s interested and profitable commodity. Cisaat is one of producer of Koi fish that located in Northern Sukabumi, West Java, Indonesia. The turnover of Koi fish business in Cisaat can reach IDR 20 million per month. However, productions are still fluctuative and high quality products are still difficult to achieved, so the research study about the factors that influence Koi fish’s production is necessary to do. The purposes of this study are (1) to identify the factors that influence Koi fish’s production in Cisaat; (2) to analyze the efficiency level of the use of production factors of Koi fish in Cisaat; and (3) to identify consumer’s transaction motive to purchase koi fish in Cisaat. The production function model is analyzed by using multiple linear regeression analysis, production efficiency analysis are technically and economically, and consumer’s transaction motive to purchase Koi fish is analyzed by using descriptive analysis. The result of the research study showed that seed, manure, and medicines significantly affected Koi fish’s production. The use of these production factors has been achieved the efficiency technically but not economically yet. The main transaction motive to purchase Koi fish is because of its beauty on it’s body shape and colors with purchasing purpose is hobby.
Keyword: Bogor Agricultural University (IPB), transaction motive, production, multiple linear regression analysis, Koi fish, efficiency

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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