Judul: Sistem Perekomendasi Wisata Alam di Kabupaten Bogor Berbasis Mobile Menggunakan Metode Item-Based Collaborative Filtering
Abstrak: Bogor Regency is one of regions that has a high chance and tourist attraction. Beside a strategic location, Bogor Regency also has many beautiful natural tourism. The lack of information makes the tourists don’t know and visited natural tourism in Bogor Regency. Therefore we need a system of the recommenders. This study was conducted to establish the recommender systems Bogor Regency natural tourism which is expected to provide reference to travelers who want to / will visit Bogor Regency. The system is built with the recommenders using item-based collaborative filtering and the Android platform. The recommenders system is able to display a list of nature tourism with the description based on recommendations from the user.
Keyword: Bogor Agricultural University (IPB), recommender system, natural tourism, collaborative filtering

Judul: Sistem Perekomendasi Wisata Alam di Kabupaten Bogor Berbasis Mobile Menggunakan Metode Multi Criteria Collaborative Filtering.
Abstrak: Kabupaten Bogor merupakan salah satu daerah yang memiliki peluang dan daya tarik wisata yang tinggi. Selain memiliki lokasi yang strategis, kabupaten ini juga memiliki banyak objek wisata alam yang indah, akan tetapi kurangnya informasi membuat wisatawan tidak mengetahui objek wisata alam di Kabupaten Bogor yang sebaiknya dikunjungi. Oleh karena itu diperlukan suatu sistem perekomendasi. Penelitian ini bertujuan membangun suatu sistem perekomendasi wisata alam Kabupaten Bogor berbasis mobile dengan metode item-based collaborative filtering menggunakan sejumlah kriteria rating (multi criteria rating) sebagai data masukan. Penelitian ini menggunakan dua metode similarity, yaitu cosine similarity dan pearson-correlation similarity. Sistem perekomendasi mampu menampilkan daftar wisata alam beserta deskripsinya dan rekomendasi wisata alam berdasarkan rating user dari sejumlah kriteria. Sistem perekomendasi menghasilkan akurasi sebesar 0.525 dengan metode cosine similarity, dan 1.25 dengan metode pearson-correlation similarity.
Keyword: collaborative filtering, multi criteria rating, sistem perekomendasi, wisata alam

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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