Judul: Sistem informasi luas tanam dan perkiraan produksi cabai merah (Capsicum annuum L.) di Liwa, Lampung Barat
Abstrak: Red chili is one of the agricultural commodities that are needed in daily life for flavoring food. Lack of information on the planting and harvesting in production area of red chili on monthly basis which will have significant effect to the supply and the price as well as being one of the constraint in improving the effectiveness of the red chili logistic and supply chain system. The purpose of this research is to build information system area planting and production estimate of red chili based on SMS (Short Massage Service) and web in Liwa, West Lampung. The method used to build the information system is SDLC (System Development Life Cycle) consists of investigation, analysis, design, implementation, and maintenance of the system. The method to estimate production of red chili used Monte Carlo simulation and validation of the simulation result used MAPE (Mean Absolute Percentage Error). Analysis between observation and simulation production of red chili using linear regression obtain the coefficient of determination (R2) is 0.982 for Lado variety and 0.993 for Jitu variety. Validation between observation with the simulation production of red chili Jitu and Lado varieties can be accepted in satisfactory use of MAPE.
Keyword: Bogor Agricultural University (IPB), web, sms, information system, red chili

Judul: Pengembangan Basis Pengetahuan Manajemen Nutrisi Cabai Merah (Capsicum annuum L.) di Wilayah Tropika Berbasis Pertanian Teliti (Precision Farming)
Abstrak: Red chili (Capsicum annuum L.) is a strategic agricultural commodities grown in Indonesia. Cultivation of red chili generaly faces many constraints, such as cultivation techniques, pests and plant diseases, post-harvest handling, and fertilization. These constraints can occur because the average of a farmers have insufficient knowledge on cultivation best practices, particularly about fertilization for red chili. The objective of this research is to developed knowledge base of red chili nutrient management in tropical region based on precision farming. This research includes data and information collecting, knowledge acquisition, knowledge base repesentation, knowledge coding and testing. Finally prototype a application development was done to demonsrate the usability of knowledge based developed in this research. Knowledge aquisition was carried out by literature survey and expert interviews. In our system, knowledge is represented as decision trees/decision tables, and related data model. The main result of this research is the knowledge base of red chili nutrient management and cultivation that can be used for several application such as expert systems, decision support systems, and consultation systems for farmers, agroindustry, practitioners, or other agribusiness units. The specific result of the research is a knowledge about how to determine dosage of limestone/sulfur based of pH and texture, animal manure based of organic carbon, singular and compound fertilizers based on the amount of red chili nutrient requirement. The knowledge base system was implemented using PostgreSQL and the application prototype was built using PHP on web platform basis.
Keyword: 

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