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Kota surabaya,
Jawa timur
INDONESIA
IPTEK The Journal for Technology and Science
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : 08534098     EISSN : 20882033     DOI : -
Core Subject : Science,
Computer Science & IT
IPTEK The Journal for Technology and Science (eISSN: 2088-2033; Print ISSN:0853-4098), is an academic journal on the issued related to natural science and technology. The journal initially published four issues every year, i.e. February, May, August, and November. From 2014, IPTEK the Journal for Technology and Science publish three times a year, they are in April, August and December in online version.
Arjuna Subject : -
Articles 12 Documents
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Search results for , issue "Vol 31, No 2 (2020)" : 12 Documents clear
Opinion Analysis of Traveler Based on Tourism Site Review Using Sentiment Analysis Amira, Siti Azza; Irawan, M. Isa
IPTEK The Journal for Technology and Science Vol 31, No 2 (2020)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v31i2.6338

Abstract

Technology development nowadays makes it easier for people to access information. One of them is to find information regarding a place. Many prospective visitors would read reviews from people who have visited a place to find out how they rate a place. Opinion on other people’s reviews is very influential in influencing others’ decisions in assessing a place they want to visit. Opinion analysis can be done by conducting a sentiment analysis of hotel customer reviews. The data used are traveler reviews of hotels in East Java on the Tripadvisor site. Traveler reviews data was taken by crawling on tourist sites, and the unstructured reviews data would be a preprocessing and weighted term from reviews using the TF-IDF method. The classification process is done using the support vector machine method to find opinions from traveler reviews, which are positive or negative. Based on the classification results, hotels that have the most positive sentiments in Surabaya are Harris Hotel Gubeng and Pop! Hotel Gubeng with the same number of reviews, 252 reviews. In comparison, hotels with the most positive sentiment in Malang are Harris Hotel Malang with 311 reviews. The opinion analysis results are expected to help the hotel manager evaluate and develop to increase the number of tourist visits.
Bioactive Compounds and Antioxidant Evaluation of Methanolic Extract of Hibiscus Sabdariffa Adusei, Stephen
IPTEK The Journal for Technology and Science Vol 31, No 2 (2020)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v31i2.6572

Abstract

Hibiscus Sabdariffa (Roselle) is renowned for its delicacy and healing properties. Thestudy aimed at evaluating the bioactive compounds (phytochemicals) and antioxidantactivity of leaf, stem, and calyx of roselle, extracted with methanol. Phytochemicalswere identified using numerous test methods and quantified with a UV-Vis spec-trophotometer. The screening test revealed a higher number of phytochemicals in thecalyx extract than the leaf or stem. With the quantification, the highest concentrationwas recorded in the calyx, followed by the leaf and then the stem. The antioxi-dant activity of the investigated plant was in the order of calyx>leaf>stem. Higherrecoveries, ranging between 90%-110%, was obtained for all compounds. Therefore,this study provides evidence that the leaf, stem, and calyces of roselle plants arethe probable source of antioxidants and many bioactive compounds, justifying theirethnopharmacological use in conventional medicines.

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