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All Journal Jurnal Ilmiah Merpati (Menara Penelitian Akademika Teknologi Informasi) Jurnal Ilmu Komputer Buletin Udayana Mengabdi Jurnal SPEKTRUM Jurnal Pendidikan Teknologi dan Kejuruan TELKOMNIKA (Telecommunication Computing Electronics and Control) PIKSEL : Penelitian Ilmu Komputer Sistem Embedded and Logic PROSIDING CSGTEIS 2013 Jurnal Teknologi Informasi dan Ilmu Komputer JUITA : Jurnal Informatika JOIV : International Journal on Informatics Visualization Sinkron : Jurnal dan Penelitian Teknik Informatika Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi) Syntax Literate: Jurnal Ilmiah Indonesia Matrix : Jurnal Manajemen Teknologi dan Informatika Cetta: Jurnal Ilmu Pendidikan Jurnal RESISTOR (Rekayasa Sistem Komputer) Astonjadro Journal of Electrical, Electronics and Informatics International Journal of Advances in Data and Information Systems Jurnal Ilmiah Vastuwidya Prosiding Seminar Nasional Sisfotek (Sistem Informasi dan Teknologi Informasi) MATRIX : JURNAL MANAJEMEN TEKNOLOGI DAN INFORMATIKA Jurnal SPEKTRUM

I Made Oka Widyantara

Electrical Engineering Universitas Udayana

Author-ID : 416519

Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mechanical Engineering Social Sciences Other

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Desain Program Simulasi Unjuk Kerja Kode Walsh Pada Kanal Multipath Fading Made Arya Putra Kusuma; Nyoman Pramaita; I Made Oka Widyantara; I Gusti Agung Komang Diafari Djuni Harta
Matrix : Jurnal Manajemen Teknologi dan Informatika Vol 10 No 1 (2020): MATRIX - Jurnal Manajemen Teknologi dan Informatika
Publisher : Unit Publikasi Ilmiah, P3M Politeknik Negeri Bali

Penelitian ini bertujuan untuk mengetahui pengaruh perubahan jumlah komponen multipath pada unjuk kerja kode Walsh pada kanal multipath fading melalui simulasi dengan menggunakan software Matlab. Hasil simulasi ditinjau dari parameter Bit Error Rate (BER) vs Energy Bit per Noise (Eb/No). Dari simulasi dilihat perbandingan performasi sistem komunikasi unjuk kerja kode Walsh pada kanal multipath fading yang dihasilkan dengan memvariasikan jumlah komponen multipath dengan jumlah 2, 4, 6 dan 8. Sistem ini dibandingkan dengan menggunakan kanal flat fading dalam kondisi yang ideal. Hasil dari simulasi menunjukkan performansi sistem komunikasi unjuk kerja kode Walsh pada kanal multipath fading mengalami peningkatan nilai BER pada saat jumlah komponen multipath ditambahkan. Hal ini disebabkan karena semakin banyak jumlah komponen multipath yang digunakan, maka semakin banyak juga jumlah sinyal pantul yang menginterferensi sinyal yang diinginkan di penerima.

SISTEM PENDETEKSI WAJAH DENGAN METODE VIOLA JONES MENGGUNAKAN ESP32-CAM I Made Yudi Candra Putra; I Made Oka Widyantara; I Gusti Agung Komang Diafari Djuni H
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Increased security in rooms that are confidential or require high privacy, is very muchneeded. One way to increase this security is to use a security system that utilizes the biologicalcharacteristics of facial images that are owned by every human being. The biologicalcharacteristics of human facial images can be a solution for security systems in the roombecause human facial images are difficult to imitate and modify by others. This study aims toimplement a security system for detecting human face images using the Viola Jones methodwith the Haar Classification Feature. The Viola Jones method with the Haar Classificationfeature is suitable as a good visual recognition when detecting facial images via the ESP32-Cam microcontroller and for streaming video using a OV2640 camera. The test results in thisstudy showed that of the 4 objects used in human face images, the ideal distance whendetecting facial images was 30 cm, with a 100% success rate. While the level of slope tolerancethat has been detected is a maximum with a slope of 30° to the position of the face facingstraight ahead.

UNJUK KERJA KODE ORTHOGONAL M-SEQUENCE DALAM SISTEM DIRECT SEQUENCE SPREAD SPECTRUM MELALUI KANAL MULTIPATH FA Komang Gede Widi Adnyana; Nyoman Pramaita; I Made Oka Widyantara
Jurnal SPEKTRUM Vol 9 No 4 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Multipath and multi-user interference are the main challenges in wireless communication systems. This has become a driving force for the development of data transmission technology that is focused to overcome these problems, one of which is spread spectrum. Spread spectrum is applied to CDMA technology which has the limitations of MAI, so a spreading code is required with specifications that have a very low cross-correlation value as in the orthogonal m-sequence code. In this study, simulate the orthogonal m-sequence code with a length of 8 chips on a multipath fading channel using the Direct Sequence Spread Spectrum system with aims of assessing the performance of the orthogonal m-sequence code on a multipath fading channel, based on the effect of changes in the number of multipath components. The research method used is a Monte Carlo simulation on simulink with the output data in the form of a graph of the comparison value of BER with Eb/No. The results show that on the flat fading channel with the number of components multipath 1, the BER value of the simulation results is in accordance with the BER theory so that the simulation is valid and can be applied to frequency selective fading channels. In the frequency selective fading channel with the number of multipath components 4,6, and 8, the best performance was shown in the multipath 4 component with the smallest BER value, this was influenced by the ACF and CCF values so that the multipath 4 component had the lowest ISI and interference between users.

Penerapan Strategi React Berbantuan Augmented Reality Bangun Ruang Terhadap Hasil Belajar Matematika Widiadnyana, Putu; Wiharta, Dewa Made; Widyantara, I Made Oka
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : CV. Ridwan Publisher

Sistem pembelajaran daring dilakukan untuk mengurangi penyebaran wabah Covid-19. Penelitian ini bertujuan untuk mengetahui penerapan strategi pembelajaran yaitu strategi REACT dengan berbantuan media pembelajaran yaitu aplikasi augmented reality pada materi bangun ruang sisi datar. Penelitian ini menggunakan metode eksperimen dengan desain penelitian yaitu pretest-posttest control group design yang dilakukan selama proses pembelajaran daring. Subjek penelitian yaitu siswa kelas VIII di SMP Satu Atap Pejukutan, Kabupaten Klungkung. Penggunaan soal pilihan ganda digunakan untuk mengetahui hasil belajar siswa. Hasil belajar siswa selanjutnya di uji dengan uji ANOVA dan mendapatkan nilai signifikansi yaitu sebesar 0.02 yang lebih kecil dari 0.05, maka dapat disimpulkan bahwa terdapat adanya perbedaan. Berdasarkan hasil penelitian dapat disimpulkan bahwa penerapan strategi REACT berbantuan aplikasi augmented reality bangun ruang dalam pembelajaran matematika dapat meningkatkan hasil belajar siswa

Evaluasi Kinerja Codec Citra Medis Berbasis Wavelat Dan Entropy Coding Ayuni Harianti; I Made Oka Widyantara; Ni Made Ary Esta Dewi Wirastuti
Jurnal Ilmiah Vastuwidya Vol 6, No 1 (2023)
Publisher : Universitas Mahendradatta Denpasar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47532/jiv.v6i1.815

Salah satu bidang yang memanfaatkan data citra adalah di bidang medis,karena citra medis memiliki peranan yang sangat penting dalam dunia medis saat ini., biasanya citra medis membutuhkan penyimpanan yang cukup besar pada komputer dan bertujuan untuk melakukan kompresi pada citra medis menggunakan discrete wavelet transform (DWT) dan entropy coding (Huffman dan Arithmetic). Lima jenis codec yaitu Coiflet, Symlet, Daubechies, Biorthogonla dan Dmeyer digunakan dalam penelitian ini membandingkan PSNR. Penelitian ini menggunakan nilai threshold 5. Percobaan yang dilakukan menggunakan citra medis yang mewakili jenis citra hasil CT-Scan dan MRI sebagai data testing. Penelitian ini menunjukkan bahwa codec Haar/Daubhecies1, Symlet1 dan Biorthogonal1 memberikan hasil yang lebih baik dalam hal kualitas citra (PSNR).

PENANGGANAN GANGGUAN FREKUENSI RADIO RADAR CUACA BMKG WILAYAH III DENPASAR PADA PITA FREKUENSI 5 GHz Ketut Bagus Bayu Sanjaya; I Made Oka Widyantara; I G A Komang Djuni Hartawan
Jurnal SPEKTRUM Vol 10 No 1 (2023): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2023.v10.i01.p2

The existence of a radio frequency spectrum is regulated by the state as stated in Government Regulation number 53 of 2000, which is a limited natural resource that has strategic value in the operation of telecommunications. And the utilization of the radio frequency spectrum as a natural resource needs to be carried out in an orderly, efficient and appropriate manner so as not to cause harmful interference. Denpasar Class I Radio Frequency Spectrum Monitoring Center (Balmon Denpasar) as one of the UPT (Technical Service Units) of the Directorate General of SDDPI has the task of carrying out supervision and control in the field of radio frequency spectrum use in the Bali region. This study aims to be able to carry out supervision and observation of the radio frequency spectrum through observation (Ocupansy). Seeing the scope of the existing problems, this practical work report will provide the following problem boundaries: Observation of the occupation of the radio frequency spectrum through observation, measurement of technical parameters and law enforcement. There are complaints of disturbances on the radio frequency 5625 MHz for weather radar by the Meteorology, Climatology and Geophysics Agency (BMKG) Region III Denpasar caused by the use of the 5 GHz band frequency by ISPs using wireless LAN.

Ships Detection on Aerial Imagery using Transfer Learning and Selective Search Dewi, Desak Ayu Sista; Sri Arsa, Dewa Made; Susila, Anak Agung Ngurah Hary; Widyantara, I Made Oka
Jurnal Ilmiah Merpati (Menara Penelitian Akademika Teknologi Informasi) Vol 11 No 3 (2023): Vol. 11, No. 3, December 2023
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JIM.2023.v11.i03.p04

The traffic in the water area such as harbor and sea strait is highly important to be monitored because it helps to minimize unwanted ships accident. As a result, we proposed an automatic detection method to localize ships contained in sattelite image. We examine several deep learning method as the classification backbone, namely MobileNetV2, DenseNet121, VGG16, and ResNet50. Afterwards, we employed the trained model for detecting the ships. To make the detection faster, inspite of using a sliding window, we use selective search to sample the object candidates from the given scene. The experiments was done using Shipsnet dataset and tested on aerial images. We also conducted a cross domain evaluation where the images were taken using Google Earth. The results indicate that MobileNetV2 has the best performance on classification and detection tasks. The MobileNetV2 is also able to detect the ships on cross-domain scenarios.

Ship Trajectory Extraction Using Python Vessel Tracking Interpolation Method Setiawan, Widyadi; Linawati, Linawati; Widyantara, I Made Oka; Wiharta, Dewa Made; Asri, Sri Andriati
PIKSEL : Penelitian Ilmu Komputer Sistem Embedded and Logic Vol. 12 No. 2 (2024): September 2024
Publisher : LPPM Universitas Islam 45 Bekasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/piksel.v12i2.9567

A deep understanding of ship trajectory movements has essential implications for maritime applications, including navigation, monitoring, and marine traffic analysis. Efficient and accurate extraction techniques are necessary to extract valuable information from ship trajectory data. One commonly used approach is the interpolation method, which allows the reconstruction of smooth trajectories from recorded data points. This research is focused on analyzing the extraction of ship trajectories using the interpolation method provided by the Python Vessel Tracking (PyVT) library. This method allows interpolation of ship trajectory data based on various algorithms available in the library. This research aims to evaluate the effectiveness and accuracy of interpolation methods from PyVT in reconstructing ship trajectories from incomplete or disturbed data. Within this research's framework, several test scenarios were implemented to examine different types of ship trajectory data, including data with missing points and speed variations. Evaluation metrics RMSE (root mean Squared Error), which includes reconstruction accuracy, will be utilized from the interpolation algorithm in PyVT.

RANCANG BANGUN APLIKASI ARISAN ONLINE DENGAN SMART CONTRACT UNTUK MEMINIMALISIR RESIKO PENIPUAN Lintin, Yosep Tara; Aditya Widhiatama, Ngakan Putu; Purnama, Fajar; Shandyasa, I Wayan; Sukadarmika, Gede; Gede Manuaba, Ida Bagus; Oka Widyantara, I Made; Juliawan Pawana, I Wayan Adi
Jurnal SPEKTRUM Vol 10 No 4 (2023): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2023.v10.i04.p17

Arisan is an activity that is usually carried out by housewives where each member will donate money and at each meeting there will be a lottery to hand over the money that has been collected to one of the lucky members. Usually, arisan is done regularly and offline. However, since the pandemic in 2020, many people have started doing arisan online. With the rise of arisan online activities, there are many cases of fraud with a large amount of loss and of course it cannot be ignored. Based on these problems, a platform is needed to conduct arisan online that can prevent fraud cases. This container will be made in the form of a decentralized application by utilizing blockchain technology in this case this article utilizes smart contracts on the Binance Smart Chain to ensure that after this application is published, no party will be able to make changes to the data or functions of this application to minimize frauds.

KOMPRESI CITRA BERBASIS MULTI-LEVEL THRESHOLDING MENGGUNAKAN DIFFERENTIAL EVOLUTION Arda Narendra, I Gusti Lanang; Putu Krisna Adi, I Gusti Ngurah; Christanto Nadeak, Yobel; Oka Widyantara, I Made; Wiharta, Dewa Made
Jurnal SPEKTRUM Vol 10 No 4 (2023): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2023.v10.i04.p7

Compression in image data needs to be done to manage storage space efficiently. In this study, image compression is performed using the Differential Evolution (DE) algorithm as an approach to achieve an optimal threshold for pixel clustering in images. The performance of this image compression method is evaluated based on the Peak Signal-to-Noise Ratio (PSNR) and Structural Similarity Index Measure (SSIM) parameters. The PSNR of DE image compression ranges from 27 dB to 40 dB with threshold levels between 10 to 40. Meanwhile, the SSIM ranges from 0.83 to 0.97 at threshold levels of 10 to 40. The PSNR and SSIM of DE image compression are both at a good level, resulting in compressed image visuals that closely resemble the original image as the threshold levels increase.

Co-Authors A. T. A Prawira Kusuma A.A. Made Agung Istri Iswari Aditya Dwipayana Aditya Widhiatama, Ngakan Putu Agus Anwar Eka Wahyudi Anak Agung Ayu Putri Ardyanti Anang Kusnadi Andi Nur Rachman Aniek Laksmidewi Arda Narendra, I Gusti Lanang Asana, I Made Dwi Putra Atmaja, Ketut Jaya Ayuni Harianti Bagus D. Cahyono Cecep Muhamad Sidik Ramdani Christanto Nadeak, Yobel Cokis Ratih Kumbara David Clemens Sumampouw Derry Suia Pathentantama Desak Ayu Sista Dewi Dessy Hariyanti, NK Dewa Ayu Indah Cahya Dewi Dewa Made Sri Arsa, Dewa Made Dewa Made Wiharta Edo Halim Saputra Fajar Purnama Feliks Sinaga Gamantyo Hendrantoro Gede Manuaba, Ida Bagus Gede Sukadarmika Haris Chandra Agustina I Dewa Gede Hardi Rastama I G. A. K. Diafari Djuni Hartawan I G.A.K. Warmayana I Gede Iwan Sudipa I Gede Sudiantara I Gede Sudiantara I Gusti Agus Adek Putra Ardiwinata I Gusti Ayu Garnita Darma Putri I Gusti Nyoman Dharmayana I Gusti Rai Agung Sugiartha I Kadek Adi Wiguna Sanjaya I Kadek Noppi Adi Jaya I Komang Adi Bayu Adnyana I Made Aditya Virgiawan I Made Arsa Suyadnya I Made Bayu Dibawan I Made Dhanan Pradipta I Made Dwi Putra Asana I Made Rai Putera Yasa I Made Sukarsa I Made Yudi Candra Putra I Nyoman Gede Arya Astawa I Nyoman Gunantara I Nyoman Suada I Putu Agus Eka Pratama I Putu Ardana I Putu Gd Sukenada Andisana I Putu Noven Hartawan I Wayan Kayun Wardana I Wayan Shandyasa I Wayan Shandyasa I.A Laksmi IBGD. Dhyaksa Ida Bagus A. Swamardika Ida Bagus Gede Manuaba Ida Bagus Putu Adnyana Ida Bagus Putu Adnyana Indra Dwi Cahya Setyawan Janice Jessica Indrayani Jayantari, Made Widya Juliawan Pawana, I Wayan Adi Kadek Dwi Mahardika Adnyana Kadek Surya Adi Saputra Kamarudin, Nur Diyana Ketut Bagus Bayu Sanjaya Komang Ery Rusdiana Komang Gede Widi Adnyana Komang Kompyang Agus Subrata Komang Oka Saputra Komang Tri Wahyuni . L Linawati L.D. Purnamasari Linawati Linawati Linawati Linawati linawati linawati Linawati Linawati Lintin, Yosep Tara M Acarya Mordekhai Karang M Zatiar Erwan Kalam M. Azman Maricar made andyka Made Arya Putra Kusuma Made Sudarma Made Sudarma Merliana, Ni Putu Eka Muhammad Audy Bazly N Utami Wedanti N. M. A. E. Dewi Wirastuti N.M.A.E.D Wirastuti Ngurah Indra ER Ni Komang Ayu Suandaniasih Ni Made Ary Esta Dewi Wirastuti Ni Putu Widya Yuniari NMAED Wirastuti Nyoman Pramaita Nyoman Pramaita Nyoman Putra Sastra Oka, I Dewa Gede Ari P. A. Satya Prabhawa Pawana P., I Gusti Ngurah Agung Pawana, I Wayan Adi Juliawan Prabawa, I Nyoman Angga Pradnyana, I Made Prahasta Napolado Damanik Putra, Putu Bagus Adidyana Anugrah Putri Alit Widyastuti Santiary Putu Agus Pradnyana Jaya Putu Arya Mertasana Putu Krisna Adi, I Gusti Ngurah Putu Prima Winangun Putu Sintia Susiani Pande R. Sapto Hendri Boedi Soesatyo Rahmi Nur Shofa Rukmi Sari Hartati Sandhiyasa, I Made Subrata Santi Ika Murpratiwi Saputra, Komang Oka Setyohadi, Djoko Budiyanto Sri Andriati Asri, Sri Andriati Susila, Anak Agung Ngurah Hary Tri Febriana Handayani W. Setiawan Widiadnyana, Putu Widyadi Setiawan Widyanto, I Putu Wikananda, I Gusti Ngurah Satya Wirawan Wirawan

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