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Lontar Komputer: Jurnal Ilmiah Teknologi Informasi
Published by Universitas Udayana
ISSN : 20881541     EISSN : 25415832     DOI : 10.24843/LKJITI
Core Subject : Science,
Computer Science & IT
Lontar Komputer [ISSN Print 2088-1541] [ISSN Online 2541-5832] is a journal that focuses on the theory, practice, and methodology of all aspects of technology in the field of computer science and engineering as well as productive and innovative ideas related to new technology and information systems. This journal covers research original of paper that has not been published and has been through the double-blind reviewed journal. Lontar Komputer published three times a year by Research institutions and community service, University of Udayana. Lontar Komputer already indexing in Scientific Journal Impact Factor with impact Value 3.968. Lontar Komputer already indexing in SINTA with score S2 and H-index 5.
Arjuna Subject : -
Articles 226 Documents
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CONTENT-BASED IMAGE RETRIEVAL MENGGUNAKAN WALSHLET PYRAMID DAN GABOR WAVELET Ni Nyoman Budiasih
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol. 4, No.3 Desember 2013
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (837.653 KB)

Abstract

Content-Based Image Retrieval (CBIR) merupakan salah satu media pencarian informasi berupa gambar yang banyak digunakan. CBIR dikembangkan dengan menerapkan tiga metode, Walshlet Pyramid, Gabor Wavelet dan penggabungan Walshlet Pyramid dengan Gabor Wavelet. CBIR dimulai dengan subsistem indexing dilanjutkan dengan subsistem searching. Pengujian menunjukan aplikasi dengan metode penggabungan memberikan hasil yang lebih baik, rata-rata 81% citra dapat ditemukan kembali pada metode penggabungan. Metode Walshlet Pyramid menunjukan rata-rata 73% citra dapat ditemukan kembali, sedangkan rata-rata 68% citra dapat ditemukan kembali dengan menggunakan metode Gabor Wavelet. Sistem Content-Based Image Retrieval yang mengutamakan singkatnya waktu dalam pencarian citra lebih baik menggunakan metode Walshlet Pyramid akan tetapi untuk sistem yang mengutamakan kesesuaian citra dapat menggunakan metode penggabungan.
Design of Autonomous Quadcopter Using Orientation Sensor with Variations in Load Fulcrum Point Ratna Aisuwarya; Fitra Marta Yonas; Dodon Yendri
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol. 10, No. 2 August 2019
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (962.169 KB) | DOI: 10.24843/LKJITI.2019.v10.i02.p03

Abstract

In designing the quadcopter, the main focus is stability and balance. Thus, in the more specific implementation, for example for aerial photography, a quadcopter can also be used as a load carrier. To be able to balance the quadcopter equipped with an orientation sensor on the controller, the orientation sensor includes a gyroscope sensor, accelerometer, and magnetometer. For this reason, it is necessary to have an autonomous stabilizer mechanism that can make the quadcopter stay in a stable and balanced condition even with the additional load. Furthermore, in this research, we will discuss how to determine the PID set points for quadcopter balance that can be tested on loads with different fulcrums. The test is limited to the condition of the quadcopter being hovered for pitch and roll angles. Based on the testing results, it can be concluded that there is a stability response in the Quadcopter. It can be seen from the RMS value obtained that it is by the steady-state tolerance of 2% -5% of the setpoint. Then, the Quadcopter can carry the maximum load with different fulcrums; 950g for fulcrum in the middle of the quadcopter, 580g for the load is placed 6 cm from the middle of the quadcopter, and 310g if the load is placed on one motor.
Audit TI Kinerja Manajemen PT. X Dengan Frame Work Cobit 4.1 I Putu Ade Ambara Putra; I Made Sukarsa; I Putu Agung Bayupati
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol. 6, No.1 April 2015
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (705.832 KB)

Abstract

The development of information technology is now widely used by companies of airport to improve service to customers. The use of such technology to facilitates of information, communication, and banking transactions. The use of information technology in the operations of PT. X have many risks. The Risks that exist on the PT. X requires the existence of information technology governance to minimize it. The objective is to obtain information regarding the level of IT maturity and gaps. The framework used is COBIT 4.1. The Results found the maturity level on the current state is level 3 and the expected conditions to be reached is level 5. The analysis carried out on the gap and then made a recommendation strategies to existing gaps, so that the level of maturity that expected to be achieved. To minimize the gap maturity level, need the suggestions for improvement that taken from the high control objectives COBIT 3rd edition. The importance level give the process is a standard model, among others Critical Sucess Factor (CSF), indicators such as the Key Goal Indicators (KGI) and Key Performance Indicator (KPI).
Rancang Bangun Aplikasi Augmented Reality Museum Bali Berbasis Android Studi Kasus Gedung Karangasem dan Gedung Tabanan I Gede Aditya Nugraha; I Ketut Gede Darma Putra; I Made Sukarsa
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol. 7, No. 2 Agustus 2016
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (738.775 KB) | DOI: 10.24843/LKJITI.2016.v07.i02.p03

Abstract

Museum Bali is one of the museum which is located in Denpasar City that established since 1910. The Museum collections consist of items such as living equipment, art, religion, handwriting, and other things that show the situation and the development of the Balinese culture. Augmented Reality is a technology which combines two-dimensional virtual objects or three-dimensional virtual objects into the real environment. Museum Bali has decreased the amount of visitors in recent years and requires an innovation to promote Museum Bali. One innovation that is expected to promote the Museum Bali is to create an augmented reality application that called Augmented Reality Museum Bali in Android platform. Utilizing augmented reality technology that works by detecting the marker then it show up the 3D object and the information from one of the objectsin Museum Bali. Markerless method used in detection marker that make this application moreattractive and expected to be a new experience for the people who want to know more about Museum Bali.
PERBAIKAN SISTEM STANFORD RTE PADA KALIMAT MENGANDUNG EKSPRESI ARITMATIKA Rakhmat Arianto; Daniel Oranova Siahaan; Ahmad Saikhu
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol. 4, No. 2 Agustus 2013
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (112.959 KB)

Abstract

Sistem Stanford Recognizing Textual Entailment adalah sistem yang dapat mendeteksi entailment maupun kontradiksi yang terkandung dalam pasangan kalimat Text dan Hypothesis.Pada tahun 2009, dilakukan penelitian pengembangan sistem Stanford RTE dengan menggabungkan sistem Stanford RTE pada tahun 2006 dengan sistem Stanford RTE pada tahun 2008.Salah satu kelemahan pada sistem Stanford RTE tahun 2009 adalah kesalahan deteksi kontradiksi pada pasangan kalimat Text dan Hypothesis mengandung ekspresi aritmatika.Untuk menutupi kelemahan tersebut, ditambahkan fitur aritmatika dalam sistem Stanford RTE yang khusus memproses pasangan kalimat Text dan Hypothesis mengandung ekspresi aritmatika.Fitur aritmatika dibangun dengan empat tahap utama, yaitu tahap analisa linguistik, tahap pencarian nilai kemiripan kata, tahap penentuan operator aritmatika, dan tahap penyimpulan entailment, kontradiksi, atau tidak diketahui.Fitur aritmatika telah dilakukan pengujian terhadap 30 pasang kalimat Text dan Hypothesis mengandung ekspresi aritmatika yang diambil dari halaman website berita dengan hasil tingkat keberhasilan mencapai 80%.
Dimensionality Reduction using PCA and K-Means Clustering for Breast Cancer Prediction Ade Jamal; Annisa Handayani; Ali Akbar Septiandri; Endang Ripmiatin; Yunus Effendi
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol. 9, No. 3 December 2018
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (364.208 KB) | DOI: 10.24843/LKJITI.2018.v09.i03.p08

Abstract

Breast cancer is the most important cause of death among women. A prediction of breast cancer in early stage provides a greater possibility of its cure. It needs a breast cancer prediction tool that can classify a breast tumor whether it was a harmful malignant tumor or un-harmful benign tumor. In this paper, two algorithms of machine learning, namely Support Vector Machine and Extreme Gradient Boosting technique will be compared for classification purpose. Prior to the classification, the number of data attribute will be reduced from the raw data by extracting features using Principal Component Analysis. A clustering method, namely K-Means is also used for dimensionality reduction besides the Principal Component Analysis. This paper will present a comparison among four models based on two dimensionality reduction methods combined with two classifiers which applied on Wisconsin Breast Cancer Dataset. The comparison will be measured by using accuracy, sensitivity and specificity metrics evaluated from the confusion matrices. The experimental results have indicated that the K-Means method, which is not usually used for dimensionality reduction can perform well compared to the popular Principal Component Analysis.
IMPLEMENTASI STRUKTUR TREE PADA RANCANG BANGUN SISTEM PENELUSURAN SEJARAH PURA KAWITAN DAN KAHYANGAN JAGAT BERBASIS WEB A. A. K. Oka Sudana
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol. 2, No. 1 Juni 2011
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (748.375 KB)

Abstract

Keberadaan Pura Kahyangan Jagat dan Pura Kawitan bagi Umat Hindu adalah mutlak untuk diketahui. Berbeda dengan kenyataan tersebut, ada sementara orang dari Umat Hindu di Bali yang kurang mengetahui atau mengenal tempat, status dan fungsi dari sebuah pura atau kahyangan terutama pura atau kahyangan yang lazim disebut Kawitan atau Pedharman dan Pura Kahyangan Jagat yang ada di Bali. Demikian juga mengenai tata cara dan prosedur melakukan persembahyangan sering diabaikan dan tidak dilaksanakan sebagai mana mestinya. Guna mengatasi keterbatasan informasi keberadaan Pura Kahyangan Jagat dan Pura Kawitan di Bali, maka dirancang dan dibuat suatu sistem yang dapat memberikan informasi keberadaan Pura Kahyangan Jagat dan Pura Kawitan yang ada di Bali sehingga umat dapat lebih mengetahui kejadian-kejadian yang terjadi di pura tersebut. Struktur Tree yang dikombinasikan dengan aplikasi model hirarki pada pemrograman berbasis web digunakan sebagai dasar implementasi penelusuran. Sistem ini mampu memberikan pelayanan penelusuran dan pendataan pura secara efisien dan cepat, juga mampu menyimpan data secara aman. Sistem ini sangat praktis karena bersifat on-line yaitu dapat diakses melalui internet.
Permainan Edukasi Labirin Virtual Reality Dengan Metode Collision Detection Dan Stereoscopic Aditya Bhaskara Gde Sang; Putu Wira Buana; I Ketut Adi Purnawan
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol. 8, No. 2 Agustus 2017
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (698.304 KB) | DOI: 10.24843/LKJITI.2017.v08.i02.p01

Abstract

General knowledge is the knowledge most people know about. LIPI (Indonesian Institute of Sciences) Survey’s in 2015 states 54% of 1,829 respondents are less aware of knowledge and technology information. Most Indonesians prefer using internet for social media rather than seeking information about knowledge or issues in society [1]. This problem can be overcome with more interactive educational media, so can add insight of general knowledge in fun way. Virtual Reality is technology capable of creating interactive virtual environment. Virtual Reality is used to create educational game called LabirinVR. LabirinVR created using GoogleVR SDK with Collision Detection and Stereoscopic Vision Methods. Game interactions utilize Accelerometer and Gyroscope sensors. The application is able to increase the ability of thinking, creativity, and insight of general knowledge of Indonesia and the world. The application function test result is 100% valid and has 98% feasibility level, so it has good UAT (User Acceptence Test) [2], accepted and used by the people.
Aplikasi Penghitungan Gross Primary Production dari Data Penginderaan Jauh Komang Gede Kurniadi; I Putu Agung Bayupati; I Dewa Nyoman Nurweda Putra
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol. 7, No. 1 April 2016
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (539.3 KB) | DOI: 10.24843/LKJITI.2016.v07.i01.p04

Abstract

Calculation of Gross Primary Production that utilize remote sensing data is can be done on commercial remote sensing software by manual method. The commercial remote sensing software does not provides a specific feature that allow the user to do the Gross Primary Production calculation. This research is aimed to to build a remote sensing software that can be specifically used to do the Gross Primary Production calculation for Denpasar area. This software accepts remote sensing data as an input, such as satellite image from Landsat 8 OLI and TIRS and metadata file. The formulas and supporting data that required on the Gross Primary Production calculation are implemented on software in order to make an automatic image processing software. There also some additional feature on this software such as automatic data parsing from metadata file, cropping, masking and zoom that could help user to do the Gross Primary Production calculation. The developed software is able to produce information such as Gross Primary Production value that depicted by a figure with color segmentation, area of the segments and mean, minimum and maximum value of the Gross Primary Production.
Implementation of Data Backup and Synchronization Based on Identity Column Real Time Data Warehouse I Gede Adnyana; I Made Dwi Jendra Sulastra
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol 11 No 1 (2020): Vol. 11, No. 1 April 2020
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (757.04 KB) | DOI: 10.24843/LKJITI.2020.v11.i01.p02

Abstract

Failure in the process of loading data from the Online Transactional Processing(OLTP) system to the Normalized Data Store (NDS) database can occur. This caused by a disruption in the network so that the OLTP system is unable to save data to the OLTP and NDS databases. Backup and synchronization data scenarios are needed to maintain data consistency and data availability. In this research, the process of data backup and synchronization is done by providing an identity column for the table in the OLTP database. An identity column is used to give status data, value '0' if the inserting process fails, and value '1' if successful. Data backup is done by storing temporary data into a CSV file format, then the CSV file is read, and an insert process is carried out into the OLTP database. After the insertion process into the OLTP database is successful, it continues with the synchronization process between the OLTP database and the NDS. Data synchronization between OLTP and NDS databases is done by checking the value of the Identity Column in each table in the OLTP database.

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