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Journal articles on the topic 'DFT metody'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Ito, Izumi. "A New Pseudo-Spectral Method Using the Discrete Cosine Transform." Journal of Imaging 6, no. 4 (2020): 15. http://dx.doi.org/10.3390/jimaging6040015.

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The pseudo-spectral (PS) method on the basis of the Fourier transform is a numerical method for estimating derivatives. Generally, the discrete Fourier transform (DFT) is used when implementing the PS method. However, when the values on both sides of the sequences differ significantly, oscillatory approximations around both sides appear due to the periodicity resulting from the DFT. To address this problem, we propose a new PS method based on symmetric extension. We mathematically derive the proposed method using the discrete cosine transform (DCT) in the forward transform from the relation be

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2

Žák, Vojtěch. "Metody sběru dat využívané didaktikou fyziky v mezinárodním prostředí." Scientia in educatione 7, no. 2 (2016): 18–33. http://dx.doi.org/10.14712/18047106.349.

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Strategickým cílem výzkumu, jehož součástí je tato přehledová studie, je reï¬ektovat vývoj a současný stav didaktiky fyziky (physics education research, dále PER). Cílem této studie je podat přehled metod sběru dat, a podpořit tak diskuzi o metodách výzkumu využívaných v této oblasti. K řešení výzkumného problému byl použit kvalitativní přístup a za metodu sběru dat obsahová analýza výzkumných sdělení. Za zdroj těchto textů byla zvolena databáze SCOPUS, přičemž analýza se omezila na relevantní časopisecké články, které byly publikovány v letech 2010 až 2014 a které jsou psány anglicky. Celkem

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3

Vlčková, Miroslava, and Ludvík Friebel. "The Draft of Methodology for Assessment of Quality of Financial Accounting Data Using AHP Method." Český finanční a účetní časopis 2015, no. 2 (2015): 58–69. http://dx.doi.org/10.18267/j.cfuc.443.

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4

Aleksić, Anđelko, and Milenko Ljubiša Sekulić. "OPTIMIZACIJA PARAMETARA PROCESA REZANJA POMOĆU PRIRODOM INSPIRISANIH ALGORITAMA." Zbornik radova Fakulteta tehničkih nauka u Novom Sadu 34, no. 03 (2019): 411–14. http://dx.doi.org/10.24867/02am02aleksic.

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U radu je prikazan kratak osvrt na značaj modelovanja procesa obrade kao i osnovne metode modelovanja. Dat je teoretski deo o optimizaciji procesa obrade sa kratkim pregledom metoda optimizacije, kao što su: lokalno pretraživanje, algoritam simultanog žarenja i algoritam slepog miša. Detaljno je opisan mravlji algoritam - ACO i algoritam roja čestica - PSO. Prikazana su eksperimentalna istraživanja i matematički model na osnovu kog je vršena optimizacija pomoću ACO, PSO i GA (genetski algoritam). Takođe je izvršeno poređenje rezultata dobijenih optimizacijom pomoću prirodom-inspirisanih algori

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Jin, Quanyi. "Detection Methods of Interharmonics Parameters Based on DFT Filter Banks." International Journal of Innovative Research in Engineering & Management 3, no. 6 (2016): 471–73. http://dx.doi.org/10.21276/ijirem.2016.3.6.3.

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Simić, Aleksa. "LOKACIJA KVARA U DISTRIBUTIVNIM MREŽAMA." Zbornik radova Fakulteta tehničkih nauka u Novom Sadu 35, no. 03 (2020): 533–36. http://dx.doi.org/10.24867/07be23simic.

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Ovaj rad se bavi problematikom lokacije kvara u distributivnim mrežama. Dat je pregled mogućih metoda za lokaciju kvara. Obrađene su impedantne metode kao i metode bazirane na merenju propada napona. Na kraju rada izvršeno je testiranje strujne i impedantne metode na primeru test ditributivne mreže.

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7

Oblaković, Mirjana, Valentina Sokolovska, and Bojana Dinić. "TRETMANI NEDOSTAJUĆIH PODATAKA." Primenjena psihologija 8, no. 3 (2015): 289. http://dx.doi.org/10.19090/pp.2015.3.289-309.

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U radu je dat kritički osvrt na najčešće korišćene tretmane nedostajućih podataka: tradicionalne, kao što su isključivanje nedostajućih podataka i jednostruke imputacije (zamena nedostajućih podataka srednjom vrednošću, imputacija pomoću regresije, slučajna imputacija), moderne, kao što su tretmani zasnovani na maksimalnoj verodostojnosti (npr. EM algoritam i FIML metod) i metodi višestruke imputacije. Ukazano je na prednosti i mane svakog od ovih tretmana i preporuke u vezi sa odabirom tretmana u odnosu na mehanizam nedostajanja podataka, tip i nivo merenja varijable, veličinu uzorka i slično

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8

Ariyanto, Yuri, Rizky Ardiansyah, and Bias Paris. "STEGANOGRAFI MENGGUNAKAN METODE DISCRETE FOURIER TRANSFORM (DFT)." Jurnal Informatika Polinema 4, no. 2 (2018): 87. http://dx.doi.org/10.33795/jip.v4i2.151.

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Seiring dengan kemajuan teknologi, serangan terjadi pada industri photography di mana banyak penyalahgunaan foto yang memiliki hak cipta tanpa seijin pemilik foto tersebut. Karena itulah dibuat sebuah aplikasi yang berfungsi untuk menyisipkan watermark dengan menggunakan metode DFT (Discrete Fourier Transform). Metode tersebut adalah metode matematika yang sering digunakan dalam bidang elektronika dan komputer. Metode ini secara khusus digunakan untuk menyelesaikan masalah yang berhubungan dengan frekuensi, sehingga metode ini dapat digunakan dalam bidang citra digital. Metode ini diterapkan u

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9

Karpiuk, Michał. "Design for manufacturing for sheet metal parts." Mechanik, no. 12 (December 2016): 1872–73. http://dx.doi.org/10.17814/mechanik.2016.12.530.

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10

Voňková, Hana, Ondřej Papajoanu, and Stanislav Bendl. "Aplikace metody ukotvujících vinět v pedagogickém výzkumu: přehled literatury a metodologická doporučení." Pedagogická orientace 26, no. 3 (2016): 537–59. http://dx.doi.org/10.5817/pedor2016-3-537.

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Dotazníková šetření se (sebe)hodnoticími položkami jsou v pedagogickém výzkumu využívána často. Respondenti však mohou na tyto položky odpovídat rozdílně, tj. volit jiné škálové kategorie, přestože jejich objektivní situace je stejná. Metoda ukotvujících vinět nabízí řešení tohoto problému. Odpovědi na tyto položky koriguje o rozdílné užívání škály a činí je tak porovnatelné. Tento příspěvek si klade dva cíle. Zaprvé poskytnout přehled do této chvíle publikovaných prací z oblastí pedagogického výzkumu, ve kterých byla tato metoda aplikována. Zadruhé shrnout metodologická doporučení týkající se

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11

Xue, Hui, Hui Lan Li, Jiang Bo Wang, and Hong Wei Tang. "Windowed DFT Method for Frequency Measurement Involving Amplitude Modulation." Advanced Materials Research 986-987 (July 2014): 1634–37. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1634.

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A windowed DFT method is proposed for power system frequency measurement involving amplitude modulation. First, an error analysis of conventional DFT based method considering amplitude modulation is given. Second, a noval a window DFT function is proposed method to eliminate these errors is given based on the relation among three consecutive DFT values. Due to its high precision and low required processing effort, the proposed algorithm is a good candidate for online frequency measurement.

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12

Yunus, Mahmuddin, and Agus Harjoko. "Penyembunyian Data pada File Video Menggunakan Metode LSB dan DCT." IJCCS (Indonesian Journal of Computing and Cybernetics Systems) 8, no. 1 (2014): 81. http://dx.doi.org/10.22146/ijccs.3498.

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AbstrakPenyembunyian data pada file video dikenal dengan istilah steganografi video. Metode steganografi yang dikenal diantaranya metode Least Significant Bit (LSB) dan Discrete Cosine Transform (DCT). Dalam penelitian ini dilakukan penyembunyian data pada file video dengan menggunakan metode LSB, metode DCT, dan gabungan metode LSB-DCT. Sedangkan kualitas file video yang dihasilkan setelah penyisipan dihitung dengan menggunakan Mean Square Error (MSE) dan Peak Signal to Noise Ratio (PSNR).Uji eksperimen dilakukan berdasarkan ukuran file video, ukuran file berkas rahasia yang disisipkan, dan r

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13

Robidas, Raphaël, Claude Y. Legault, and Stefan M. Huber. "A low cost, high accuracy method for halogen bonding complexes." Physical Chemistry Chemical Physics 23, no. 4 (2021): 3041–49. http://dx.doi.org/10.1039/d0cp05614f.

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14

Ryu, Sang-Burm, and Heung-Gyoon Ryu. "Compensation of Phase Noise and IQ Imbalance in the OFDM Communication System of DFT Spreading Method." Journal of Korean Institute of Electromagnetic Engineering and Science 20, no. 1 (2009): 21–28. http://dx.doi.org/10.5515/kjkiees.2009.20.1.021.

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15

N. Ramesh Babu, N. Ramesh Babu, S. Subashchandrabose S. Subashchandrabose, M. Syed Ali Padusha, and H. Saleem H. Saleem. "Structural and Vibrational studies on (E)-1-(4- methoxybenzylidene) Semicarbazide (MBSC) using experimental and DFT methods." Indian Journal of Applied Research 4, no. 4 (2011): 1–6. http://dx.doi.org/10.15373/2249555x/apr2014/202.

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16

HAJDUK, Vladimír, Martin DZIAK, Miroslav VOZŇÁK, and Dušan LEVICKÝ. "ANALYSIS OF STEGANOGRAPHIC METHODS IN DCT DOMAIN." Acta Electrotechnica et Informatica 17, no. 3 (2017): 13–16. http://dx.doi.org/10.15546/aeei-2017-0020.

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17

Zeng, Chunyan, Yin Zhu, Xu Shu, Nonghua Lv, Qiang Cai, and Youxiang Chen. "Endoscopic Resection of Gastric Submucosal Masses by a Dental Floss Traction Method." Canadian Journal of Gastroenterology and Hepatology 2019 (May 2, 2019): 1–5. http://dx.doi.org/10.1155/2019/1083053.

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Background and Aims. ESE (endoscopic submucosal excavation) is widely used for the treatment of digestive diseases. The dental floss traction (DFT) method has been successfully used to facilitate ESE to resect mucosal lesions such as early gastric cancer. DFT has not been used in ESE to remove submucosal masses. This study aimed to examine the efficacy of DFT-assisted ESE (DFT- ESE) for the removal of submucous masses.Methods. From March 2017 to May 2017, a total of 12 patients with gastric submucosal masses at the First Affiliated Hospital of Nanchang University, Jiangxi, China, were enrolled

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18

Irtawaty, Andi Sri. "IMPLEMENTASI METODE FAST FOURIER TRANSFORM (FFT) DALAM MENGKLASIFIKASIKAN SUARA PRIA DAN WANITA DI LABORATORIUM JURUSAN TEKNIK ELEKTRO POLITEKNIK NEGERI BALIKPAPAN." JTT (Jurnal Teknologi Terpadu) 7, no. 2 (2019): 70–75. http://dx.doi.org/10.32487/jtt.v7i2.661.

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Metode Fast Fourier Transform (FFT) merupakan suatu metode yang digunakan untuk merepresentasikan sinyal suara dalam domain waktu diskrit menjadi sinyal suara dalam domain frekuensi [1]. FFT merupakan turunan dari persamaan DFT dimana jumlah perhitungan digital pada DFT dapat dikurangi secara significant sehingga dengan adanya penemuan FFT maka perhitungan digital terhadap spektrum-spektrum frekuensi dapat diwujudkan secara sederhana dalam implementasinya [2]. Dalam penelitian ini, akan dilakukan pengujian terhadap 10 sampel suara yang direkam dalam format .wav, dan tujuan akhirnya adalah untu

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Adnyani, Luh Putri, Nur Aisyah, S. Sulistijono, Rima Gusriana Harahap, Anggoronadhi Dianiswara, and N. Nurmawati. "Analisa Kekuatan Deck BARGE NANIA 10070 DWT Dengan Dua Metode Pembebanan." Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 16, no. 2 (2019): 49–55. http://dx.doi.org/10.14710/kapal.v16i2.22149.

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20

Fitri, Diah Angraina. "Implementasi Penggunaan Software PHASE/0 Mengukur Struktur Elektronik Monolayer pada Graphene Menggunakan Metode Density Functional Theory." INOVTEK Polbeng - Seri Informatika 2, no. 1 (2017): 26. http://dx.doi.org/10.35314/isi.v2i1.113.

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Intisari – Graphene adalah material yang terdiri dari atom-atom Carbon. Graphene sangat menarik untuk dibahas terkait pada pemanfaatan dalam bidang semikonduktor. Dalam penelitian ini, diamati struktur elektronik pada struktur kristal layer tunggal / monolayer pada graphene menggunakan perhitungan first-principles berbasis metode density functional theory (DFT) dengan menggunakan software PHASE/0. Dan juga menggunakan Generalized Gradient Approximation (GGA). Dalam penelitian ini, didapatkan bahwa struktur kristal satu layer / monolayer dari graphene tidak memiliki sifat celah pita energi (no

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21

Suyadi, Tarekh Alif Firmansyah, and Hindarto. "IDENTIFIKASI SINYAL ELEKTRO ENSEPHALO GRAPH (EEG) SEBAGAI PENGGERAK KURSOR DENGAN DISCRETE FOURIER TRANSFROM (DFT) DAN K-NEAREST NEIGHBORS (KNN)." Jurnal Informatika Polinema 6, no. 1 (2020): 81–84. http://dx.doi.org/10.33795/jip.v6i1.295.

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Penelitian ini menjelaskan aplikasi tetangga terdekat k yang mengeksekusi klasifikasi sinyal EEG dan menyajikan konsep metode Discrete Fourier Transfrom (DFT) untuk ekstraksi fitur dari sinyal electroencephalogram (EEG). Data yang digunakan adalah data yang mengatur subjek untuk mengontrol kursor yang bergerak di monitor dengan membayangkan gerakan tangan kanan dan tangan kiri yang diambil dari BCI Competition 2005. Data ini berisi data dari subjek, dari merekam gerakan imajinasi tangan kiri (kelas 1) dan tangan kanan(kelas 2). Pengambilan keputusan dilakukan dalam dua tahap. Pada tahap pertam

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22

Sudinda, Teddy. "ANALISA POTENSI SUMBER DAYA AIR PULAU OBI HALMAHERA." Jurnal Rekayasa Lingkungan 13, no. 2 (2021): 166–81. http://dx.doi.org/10.29122/jrl.v13i2.4680.

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Peningkatan kebutuhan air untuk pertambangan nikel di Pulau Obi perlu analisa potensi Sumber Daya Air untuk memenuhi kebutuhan tersebut. Dalam hal inipenulis melakukan penelitian pada Danau Karo, Mata Air disekitar danau dan Sungai Akilamo. Untuk mengetahui potensi Danau Karo dilakukan analisa aliran permukaan terhadap DAS Danau Karo diakibatkan oleh hujan yang diperoleh dari data pengukuran presipitasi, evapotranspirasi, aliran dasar yang selanjutnya menentukan debit andalan dengan metode FJ. Mock. Debit Sungai Akilamo dan debit mata air disekitar danau dilakukan pengukuran debit secara langs

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23

Kumar, Sushil, and Rupinderpal Singh Grewal. "Computational investigations of oxazole, thiazole and carbazole having pesticide utility in agriculture by Ab-initio and DFT Methods." Indian Journal of Applied Research 3, no. 5 (2011): 62–63. http://dx.doi.org/10.15373/2249555x/may2013/17.

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24

Radhi, Ahmed H. "HOMO-LUMO Energies and Geometrical Structures Effecton Corrosion Inhibition for Organic Compounds Predict by DFT and PM3 Methods." NeuroQuantology 18, no. 1 (2020): 37–45. http://dx.doi.org/10.14704/nq.2020.18.1.nq20105.

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25

Huang, Li Qun, Peng Zhang, and Guang Yang. "A Modified DFT-Based Channel Estimation Method for OFDM-RoF System." Advanced Materials Research 989-994 (July 2014): 3521–25. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.3521.

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In this paper, we present a modified discrete Fourier transform (DFT)-based channel estimation method. The conventional DFT-based method will produce additional high frequency component in the channel impulse response, and degrade the accuracy of channel estimation. The modified algorithm can eliminate additional high frequency components by extending the LS estimate in frequency domain with a symmetric signal of its own, and selects the useful paths by calculating the changing rate of energy. Thus, the proposed algorithm become more accurate. The simulation results show the new algorithm can

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26

Borkowski, J. "LIDFT-the DFT linear interpolation method." IEEE Transactions on Instrumentation and Measurement 49, no. 4 (2000): 741–45. http://dx.doi.org/10.1109/19.863917.

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27

Fonseca Guerra, C., J. G. Snijders, G. te Velde, and E. J. Baerends. "Towards an order- N DFT method." Theoretical Chemistry Accounts: Theory, Computation, and Modeling (Theoretica Chimica Acta) 99, no. 6 (1998): 391–403. http://dx.doi.org/10.1007/s002140050353.

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28

Lee, Jin-Woong, and Woon Bae Park. "A Reasonable DFT Calculation Method for Hybrid Organic-Inorganic Halide Perovskites." Korean Journal of Metals and Materials 59, no. 4 (2021): 256–61. http://dx.doi.org/10.3365/kjmm.2021.59.4.256.

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Hybrid Organic-Inorganic Perovskites (HOIP) have received a great deal of attention as a key material for applications like solar cells and light emitting devices because of their many advantages, in spite of their stability and toxicity issues. Attempting to discover and characterize novel HOIPs using just an experimental approach would be prohibitively time-and-cost-consuming. Using theoretical or empirical calculations would greatly help. For these reasons, HOIP has been actively investigated using DFT (Density Functional Theory) calculations, which have significantly reduced research time

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Li, Hong Zhi, Lin Li, Zi Yan Zhong, Yi Han, LiHong Hu, and Ying Hua Lu. "An Accurate and Efficient Method to Predict Y-NO Bond Homolysis Bond Dissociation Energies." Mathematical Problems in Engineering 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/860357.

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The paper suggests a new method that combines the Kennard and Stone algorithm (Kenstone, KS), hierarchical clustering (HC), and ant colony optimization (ACO)-based extreme learning machine (ELM) (KS-HC/ACO-ELM) with the density functional theory (DFT) B3LYP/6-31G(d) method to improve the accuracy of DFT calculations for the Y-NO homolysis bond dissociation energies (BDE). In this method, Kenstone divides the whole data set into two parts, the training set and the test set; HC and ACO are used to perform the cluster analysis on molecular descriptors; correlation analysis is applied for selectin

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Chaturvedi, Navnidhi, and Dr S. J. Basha Dr. S. J. Basha. "DWT-SVD Based Image Watermarking Method Using Arnold Key." International Journal of Scientific Research 2, no. 5 (2012): 210–13. http://dx.doi.org/10.15373/22778179/may2013/70.

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Fan, Tong Liang, Min Jun Deng, and Hong Cheng Huang. "DFT-Based on Mahalanobis Distance Discriminant Analysis Method Channel Estimation Algorithm for OFDM Systems." Applied Mechanics and Materials 55-57 (May 2011): 472–77. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.472.

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An enhanced discrete Fourier transform DFT-based channel estimation for OFDM systems is proposed. Conventional DFT-based channel estimations improve the performance by suppressing time domain noise. However, they potentially require information on channel impulse responses and may also result in mean-square error (MSE) floor due to incorrect channel information such as channel delay spread. In order to overcome the disadvantage, our proposed channel estimation can improve the performance by deciding significant channel taps adaptively. Significant channel taps are detected on the basis of Maha

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Lee, Li Ni, and Yee Fei Phuah. "New Fault Isolation Method during Functional Test in Manufacturing." Advanced Materials Research 479-481 (February 2012): 2572–76. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.2572.

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Stop Clock Design-for-Testability (DFT) and Scan Dump DFT are integrated and implemented to trap the digital logic inside combinational and sequential logics for fault isolation (FI) purpose. Both DFTs enable functional test result to be dumped out structurally during functional test at manufacturing. Validation is performed on RTL simulation using test pattern and it is shown that the real silicon data matched the simulation results. Hence a new FI method has been established on the fly, capable in manufacturing.

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Diwaker and Abhishek Kumar Gupta. "Quantum Chemical and Spectroscopic Investigations of (Ethyl 4 hydroxy-3-((E)-(pyren-1-ylimino)methyl)benzoate) by DFT Method." International Journal of Spectroscopy 2014 (July 9, 2014): 1–15. http://dx.doi.org/10.1155/2014/841593.

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In the present work we have reported the optimized ground state geometry, harmonic vibrational frequencies, NMR chemical shifts, NBO analysis, and molecular electrostatic potential surface map of the title compound using DFT/B3LYP/6-311++G(2d, 2p) level of theory. We have compared our calculated results with the experimentally obtained values and found that both are in close agreement with each other. We have used the gauge-invariant atomic orbital (GIAO) approach to calculate the NMR (13C and 1H) chemical shifts using Gaussian 09 package. TD-DFT (time-dependent DFT) approach has been used to

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34

Bartoszek, Krzysztof, and Marcin Siłuch. "COMPARISON OF GUMIŃSKI AND SATELLITE REMOTE SENSING METHODS IN TERMS OF DETERMINING THE DATES OF THE ONSET OF THE GROWING SEASON IN POLAND." Inżynieria Ekologiczna, no. 45 (2015): 99–105. http://dx.doi.org/10.12912/23920629/60601.

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Xu, Zhixin, Dingqing Guo, Jinkai Wang, Xueli Li, and Daochuan Ge. "A numerical simulation method for a repairable dynamic fault tree." Eksploatacja i Niezawodnosc - Maintenance and Reliability 23, no. 1 (2021): 34–41. http://dx.doi.org/10.17531/ein.2021.1.4.

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Dynamic fault trees are important tools for modeling systems with sequence failure behaviors. The Markov chain state space method is the only analytical approach for a repairable dynamic fault tree (DFT). However, this method suffers from state space explosion, and is not suitable for analyzing a large scale repairable DFT. Furthermore, the Markov chain state space method requires the components’ time-to-failure to follow exponential distributions, which limits its application. In this study, motivated to efficiently analyze a repairable DFT, a Monte Carlo simulation method based on the coupli

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Kim, Sang-Woo, and Heung-Gyoon Ryu. "Design and Performance Evaluation of Selective DFT Spreading Method for PAPR Reduction in Uplink OFDMA System." Journal of Korean Institute of Electromagnetic Engineering and Science 18, no. 3 (2007): 248–56. http://dx.doi.org/10.5515/kjkiees.2007.18.3.248.

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37

Xu, Youzhong. "STUDY ON PRODUCT MODELING METHOD FOR DFT." Chinese Journal of Mechanical Engineering 38, no. 05 (2002): 13. http://dx.doi.org/10.3901/jme.2002.05.013.

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38

Donciu, Codrin, and Marinel Temneanu. "An alternative method to zero-padded DFT." Measurement 70 (June 2015): 14–20. http://dx.doi.org/10.1016/j.measurement.2015.03.015.

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Gong, Chao, Daoxing Guo, Bangning Zhang, and Aijun Liu. "Improved Frequency Estimation by Interpolated DFT Method." Procedia Engineering 29 (2012): 4112–16. http://dx.doi.org/10.1016/j.proeng.2012.01.629.

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Shirkov, Leonid, and Jan Makarewicz. "Does DFT-SAPT method provide spectroscopic accuracy?" Journal of Chemical Physics 142, no. 6 (2015): 064102. http://dx.doi.org/10.1063/1.4907204.

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Snook, I. K., M. C. Per, A. Seyed-Razavi, and S. P. Russo. "Some comments on the DFT + D method." Chemical Physics Letters 480, no. 4-6 (2009): 327–29. http://dx.doi.org/10.1016/j.cplett.2009.09.022.

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Lee, Chih-Hung, and Men-Shen Tsai. "Application of a Hybrid Method for Power System Frequency Estimation with a 0.2-second Sampled Period." MATEC Web of Conferences 201 (2018): 02007. http://dx.doi.org/10.1051/matecconf/201820102007.

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The signal processing technique is one of the principal tools for diagnosing power quality (PQ) issues in electrical power systems. The Discrete Fourier Transform (DFT) is a frequency analysis technique used to process power system signals and identify PQ problems. However, the DFT algorithm may lead to spectral leakage and picket-fence effect problems for asynchronously sampled signals that contain harmonic, inter-harmonic, and flicker components. To resolve this shortcoming, a hybrid method for frequency estimation based on a second-level DFT approach and a frequency-domain interpolation alg

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Rusli, Kanjalia, and Agus Susanto. "Perhitungan Debit pada Sistem Jaringan Pupa dengan Metoda Hardy-Cross Menggunakan Rumus Hazen-Williams dan Rumus Manning." Jurnal Teknik Sipil 5, no. 1 (2019): 40–60. http://dx.doi.org/10.28932/jts.v5i1.1311.

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Pemakaian jaringan pipa dalam bidang teknik sipil salah satunya terdapat pada sistem jaringandistribusi air minum. Analisis jaringan pipa cukup komplek dan memerlukan perhitungan yang besar.Adapun metoda yang digunakan adalah Metoda Hardy-Cross dalam menentukan debit pada masingmasingpipa. Metoda ini merupakan metoda yang paling banyak digunakan dalam melakukan analisisjaringan pipa. Dalam perhitungan ini digunakan rumus Hazen-Williams dan rumus Manning dalammenentukan nilai konsanta hambatan pipa (k).Akan dianalisis sebagian jaringan pipa PDAM di Kota Padalarang Kabupaten Bandung. Debit masuk

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Shen, Wei, and Biyang Wen. "A New Demodulation and Modulation Method Designed for FMCW Radar." Journal of Electrical and Computer Engineering 2010 (2010): 1–6. http://dx.doi.org/10.1155/2010/897429.

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An efficient demodulation method designed for FMCW (Frequency-Modulated Continuous Wave) radar is presented. It is a kind of modified DFT (IDFT) algorithm; the spectrum segment of interest can be easily extracted from the original signal without calculating the whole DFT/FFT. It provides fast demodulation and extraction of desired frequency bands in our HFSWR (High-Frequency Surface Wave Radar) system. The proposed approach enhances the performances of radar system and reduces the computing complexity. The new structure could also be inversely used for signal modulation. And also arbitrary sam

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Imelda, Imelda. "PENGGUNAAN ZAT WARNA ORGANIK UNTUK MENINGKATKAN PERFORMA PERALATAN SOLAR CELL MENGGUNAKAN METODA DENSITY FUNCTIONAL THEORY (DFT)." Lantanida Journal 4, no. 1 (2017): 19. http://dx.doi.org/10.22373/lj.v4i1.1865.

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To improve the performance of solar cell equipment can be used dye as a sensitizer, a sensitizer role is to help absorb visible light in equipment that uses a semiconductor with a wide band gap such as TiO2 and ZnO . The calculation methods used are computationally DFT and TD - DFT to determine the value of geometry optimization , energy , population density and optical properties . As for knowing the performance of experimental equipment can be obtained from the value of the open circuit voltage ( Voc ) , short circuit current density (Jsc), Fill Factor. The dye can be enhanced sensitivity ca

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Sarojini, K., H. Krishnan, Charles C. Kanagam, and S. Muthu. "Molecular Structure, Vibrational Spectroscopy and Homo, Lumo Studies of 4-methyl-N-(2-methylphenyl) Benzene Sulfonamide Using DFT Method." Advanced Materials Research 665 (February 2013): 101–11. http://dx.doi.org/10.4028/www.scientific.net/amr.665.101.

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The sulfonamide compound, 4-methyl-N-(2-methylphenyl) benzene sulfonamide has been synthesized and characterized by FTIR, NMR, UV-Vis, single crystal X-ray diffraction and thermal analysis. Density functional (DFT) calculations have been carried out for the title compound by performing DFT level of theory using B3LYP/6-31G (d,p) basis set. The calculated results show that the predicted geometry can well reproduce the structural parameters. Predicted vibrational frequencies have been assigned and compared with the experimental IR spectra and they support each other. In addition, atomic charges,

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Huang, Chao, and Wenjian Liu. "iVI‐TD‐DFT: An iterative vector interaction method for exterior/interior roots of TD‐DFT." Journal of Computational Chemistry 40, no. 9 (2018): 1023–37. http://dx.doi.org/10.1002/jcc.25569.

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Wang, Xiaoxiang, Lei Zhou, Yifan Liu, Kun Zhang, and Guangli Xiu. "Investigating the photolysis of NO2 and influencing factors by using a DFT/TD-DFT method." Atmospheric Environment 230 (June 2020): 117559. http://dx.doi.org/10.1016/j.atmosenv.2020.117559.

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Pattiasina, Timothy John. "STUDI DAN IMPLEMENTASI STEGANOGRAFI METODE ALGORITMA DAN TRANSFORMASI PADA CITRA JPEG." Teknika 2, no. 1 (2013): 46–58. http://dx.doi.org/10.34148/teknika.v2i1.13.

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Steganografi adalah seni dan ilmu menulis atau menyemhunyikan pesan tersembunyi dengan suatu cara sehingga selain si pengirim dan si penerima, tidak ada seorangpun yang mengetahui atau menyadari bahwa ada suatu pesan rahasia. lstilah steganografi termasuk penyemhunyian data digital dalam komputer Ada beberapa metode steganografi, salah satunya adalah metode Algorithms and Transformation. Metode menyembunyikan data dalam fungsi matematika yang disebut algoritma compression. Dua fungsi tersebut adalah Discrete Cosine Transformation (DCT) dan Wavelet Transformation. Fungsi DCT dan Wavelet yaitu u

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Jang, Jeong-Seok, Yong-Gyu Choi, Kyoung-Whoan Suh, and Ui-Seok Hong. "A Design of New Digital Adaptive Predistortion Linearizer Algorithm Based on DFP(Davidon-Fletcher-Powell) Method." Journal of Korean Institute of Electromagnetic Engineering and Science 22, no. 3 (2011): 312–19. http://dx.doi.org/10.5515/kjkiees.2011.22.3.312.

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