KLASIFIKASI SENTIMEN LAYANAN OJEK ONLINE MENGGUNAKAN METODE NAÏVE BAYES CLASSIFIER

Transportasi merupakan kebutuhan utama masyarakat. Transportasi ada berbagai macam jenis, salah satunya transportasi online. Transportasi onlinedapat berupa ojek online, contoh ojek onlineyaitu Gojek dan Grab. Twitter merupakan salah satu media sosial yang digunakan masyarakat untuk mengomentari layanan ojek online. Pada penelitian ini telah dilakukan klasifikasi sentimen layanan ojek online menggunakan metode Naive Bayes Classifier(NBC) menggunakan 1200 data dengan memanfaatkan TwitterAPI dan pelabelan secara manual. Dalam kasus ini menggunakan 2 (dua) kelas yaitu kelas positif dan kelas negatif dan 3(tiga) kategori yaitu manajemen, driver dan aplikasi. Data set menggunakan 90% data latih : 10% data uji dengan pengujian akurasi menggunakan model confussion matrix. Dari hasil pengujian menggunakan NBC diperoleh akurasi untuk manajemen Gojek sebesar 90%, driver90%, dan aplikasi sebesar 80%. Sedangkan akurasi manajemen Grab sebesar 90%, driver90% dan aplikasi 75%. Rata-rata akurasi Gojek sebesar 86,67% dan Grab sebesar 85%.Kata kunci: Grab, Gojek, Naive Bayes Classifier, ojek Online, Twitter API

Исследование параметров контроля качества дефектоскопических материалов

Цель данной работы - исследование параметров контроля качества дефектоскопических материалов. Изучена технология проведения контроля, параметры качества дефектоскопических материалов. В результате оценена проникающая способность наборов дефектоскопических материалов. Приведен анализ факторов, влияющих на качество дефектоскопических материалов.The purpose of this work is to study the quality control parameters of flaw detection materials. The control technology, quality parameters of flaw detection materials were studied. As a result, the penetration ability of flaw detector kits was evaluated. The analysis of factors affecting the quality of flaw detection materials is given

Released micromachined beams utilizing laterally uniform porosity porous silicon

© 2014, Sun et al.; licensee Springer. Abstract: Suspended micromachined porous silicon beams with laterally uniform porosity are reported, which have been fabricated using standard photolithography processes designed for compatibility with complementary metal-oxide-semiconductor (CMOS) processes. Anodization, annealing, reactive ion etching, repeated photolithography, lift off and electropolishing processes were used to release patterned porous silicon microbeams on a Si substrate. This is the first time that micromachined, suspended PS microbeams have been demonstrated with laterally uniform porosity, well-defined anchors and flat surfaces. PACS: 81.16.-c; 81.16.Nd; 81.16.R

Visible light emission from porous silicon under optical and electrical excitation

The main characteristics of porous silicon and the different charge exchanges involved in the formation of the material upon silicon anodisation in concentrated HF electrolytes are shortly recalled. The main features of the photoluminescence in the visible range which is observed at room temperature from high porosity layers are described. It is shown that the visible light emission can be analysed as the result of the quantum confinement of photogenerated charge carriers in the nanoscale crystallites which form the material. The electroluminescence which is obtained when the porous layer is in contact with an electrolyte is described in more details. It is shown that light emission can be observed either under anodic polarisation, but with a simultaneous oxidation of the layer, or under cathodic polarisation if a strong oxidising species is added to the electrolyte. In these conditions, a selective excitation of the material can be achieved, which leads to a voltage tunable electroluminescence signal. In a similar manner, the application of a polarisation can lead to a reversible highly contrasted and energy-selective quenching of the porous layer photoluminescence

Etude de la dissolution cathodique du tellure en milieu diméthylsulfoxyde

La réduction électrochimique du tellure est étudiée en milieu diméthylsulfoxyde par les méthodes classiques d'analyse (coulométrie, gravimétrie, voltamétrie). On montre que la dissolution cathodique du tellure est un mécanisme à deux électrons qui conduit à la formation de l’ion polytellurure [math]. On montre également que cette espèce n'est pas stable et conduit, à la suite d'équilibres de dissociation, à la formation des Ions [math] et Te2-, ainsi qu'à un dépôt de tellure

TRANSPORT DANS UN CRISTAL LIQUIDE NÉMATIQUE

L'étude des propriétés de transport d'espèces moléculaires sous forme neutre et ionisée a été entreprise afin de détecter une éventuelle interaction de nature diélectrique entre un ion migrant et le milieu nématique. Ce travail a été effectué en mesurant les coefficients de diffusion de ces espèces par des méthodes électrochimiques. Les résultats obtenus en phase isotrope et en phase nématique permettent de conclure que la friction diélectrique n'est pas le phénomène déterminant du transport ionique et que ce dernier est plus vraisemblablement lié aux interactions locales entre l'ion et les molécules adjacentes du solvant.The study of the transport properties of some molecular species, in both ionized and neutral form, has been performed in order to examine thoroughly the dielectric interactions between an ion and the molecules of a nematic mesophase. This work has been carried out by measuring the diffusion coefficients of these species by means of electrochemical methods. The results achieved in the nematic phase are compared to those observed in the isotropic phase of the liquid crystal. It is concluded that the dielectric relaxation effect is not the predominant factor affecting ionic mobilities, which are rather related to short-range interactions between the ion and the surrounding molecules of the solvent