Judul: Pengembangan Commuter Line Chatbot Jabodetabek untuk Mencari Rute Tercepat
Abstrak: Kereta Api Commuter Line Jabodetabek merupakan salah satu pilihan transportasi umum yang paling banyak digunakan oleh masyarakat Jabodetabek. Akan tetapi, bagi penumpang yang jarang menggunakan jasa Commuter Line, pemilihan rute bisa menjadi hal yang membingungkan bagi calon penumpang, terutama dari stasiun ke stasiun lain yang melewati beberapa stasiun transit. Selain itu, sampai 2018, sebagian besar pemberitahuan penting yang ada di dalam kereta maupun stasiun hanya menggunakan perangkat pengeras suara yang tidak ramah kepada penumpang kereta yang tuna rungu. Teknik yang dapat diimplementasikan untuk mencari rute tercepat untuk bepergian dari satu stasiun ke stasiun lain salah satunya adalah menggunakan algoritme Dijkstra. Penelitian ini mengembangkan sistem chatbot untuk menentukan rute tercepat menggunakan algoritme Dijkstra serta notifikasi real-time yang dapat membantu kaum tuna-rungu agar mendapatkan informasi penting dari kereta yang sedang dan akan ditumpangi.
Keyword: chatbot, Commuter Line, Dijkstra, notifikasi real-time, tunarungu

Judul: Analisis Peramalan Permintaan Jasa Transportasi Kereta Api Commuter Line Jabodetabek
Abstrak: Commuter Line railway transportation is one of the mass transportation that organize activity of transportation services in the Jabodetabek areas. The objectives of this research are to identify the data’s pattern of passenger demand volume, analyzed of passenger demand forecasting quantitatively, and analyzed of passenger demand forecasting qualitatively. Quantitative forecasting use the ARIMA’s method and Double Exponential Smoothing than compute the smallest MAPE (Mean Absolute Percentage Error) for each models to find the best forecasting model. The smallest MAPE is 9.7159 from Double Exponential Smoothing Winter version method. Qualitative method use multiple linear regression and the model result is Y=16.668+0.107X1-0.62X2+0.49X3-0.49X4- 0.009X5+ε.
Keyword: railway, forecasting, commuter line

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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