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: Simulasi pertumbuhan untuk menganalisis pengaruh jadwal  tanam terhadap produktivitas budidaya Cabai Merah (Capsicum  annuum L.) di Kabupaten Nganjuk
Abstrak: Tanaman cabai merah (Capsicum annuum L.) merupakan tanaman yang memiliki nilai ekonomis yang tinggi, namun jumlah produksi cabai merah yang fluktuatif di tingkat pasar, dapat mengakibatkan jumlah ketersediaan cabai merah yang tidak mencukupi. Sebagai solusi dibutuhkannya pendugaan jumlah hasil panen cabai merah di sepanjang tahun. Penelitian ini dilakukan untuk membuat simulasi model tanaman cabai merah yang dapat mensimulasikan proses pertumbuhan dan perkembangan tanaman cabai merah. Simulasi model tanaman cabai merah ini menggunakan parameter cuaca harian, yang meliputi: suhu maksimum, suhu minimum, suhu rata-rata, kelembaban, kecepatan angin, curah hujan, radiasi matahari, dan evaporasi potensial. Keluaran dari simulasi model ini adalah komponen biomassa harian berupa organ buah panen cabai merah (kg/ha). Ketelitian pada Kecamatan Gondang sebesar 65.3 %, Kecamatan Pace sebesar 83.1 %, dan ketelitian terhadap data rata-rata panen sebesar 93.2%., Red chilies (Capsicum annuum L.) are plants with a high economic value, but the red chilies production in market is fluctuative, so it makes the availability of red chilies is inadequate. As a solution, an estimation of the number of red chiles production in a year is necessary. This research was conducted to make a red chilies model simulation that could simulate the growth and development processes of red chilies. This red chilies model simulation used daily weather parameters including: maximum temperature, minimum temperature, average temperature, humidity, wind speed, rainfall, sun radiation, and potential evaporation. The outputs of this model simulation were daily biomass components such as red chilies crops organ (kg/ha). Precision value in Gondang Sub-district was 65.3%, precision value in Pace Sub-district was 83.1%, and precision value of average red chilies production was 93.2%.
Keyword: biomassa, cabai merah, cuaca harian, simulasi model

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