Search
242 articles for “Multi-frequency”
-
Design and Implementation of 256-bit Vedic Multiplier on Reconfigurable Platform
Abstract: Multiplication is a fundamental arithmetic operation in digital signal processing and embedded systems. Traditional multiplier architectures often suffer from increased latency and resource utilization when scaled to higher bit widths. Vedic Mathematics, an ancient Indian technique, offers a novel and efficient alternative. This paper presents the design and implementation of a 256-bit Vedic multiplier using the Urdhva Tiryakbhyam Sutra on a reconfigurable hardware platform, specifically FPGA. The proposed architecture decomposes …
Published in Journal of Materials & Metallurgical Engineering · Vol. 15, Issue 3, 2025 · pp. 56–65 Read article
-
Design and Validation of Slot Coupled Rectangular Half Mode SIW Antenna
Abstract: This paper presents the design and performance analysis of a Rectangular Half Mode Substrate Integrated Waveguide (HMSIW) antenna configuration to attain higher gain and multiband characteristics with the compact size. It is possible to produce multiband properties by placing variously shaped slots on the top of the patch and ground surface. To attain the necessary gain and multiband resonance characteristics, the type of the slot, dimension optimization, and position optimization …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 10, Issue 2, 2023 · pp. 14–21 Read article
-
Comparison of Ultra Wide Band Indoor Multipath IEEE 802.15.3 Channel Model
Abstract: ABSTRACT A very large bandwidth of frequency (3.1–10.6 GHz) has been allocated to UWB systems. A single-band UWB signal propagates differently in the lower and upper bands of the spectrum due to the size of its bandwidth. The lower part of the signal can be obstructed more easily and the man-made interferences are not homogeneously distributed over the whole spectrum. The first experimental results obtained for a UWB channel show …
Published in Journal of Communication Engineering & Systems · Vol. 2, Issue 3, 2012 · pp. 20–25 Read article
-
Deep Learning Approach to Produce Artificial Speech (Text-To-Audio)
Abstract: This program utilizes key features of the .NET framework to facilitate smooth text-to-speech conversion and audio playback. Upon execution, users are prompted to input text via a graphical user interface (GUI), which the program converts into speech using the ‘SpeechSynthesizer’ class from the ‘System. Speech.Synthesis’ namespace. The audio that has been synthesized is handled and stored as a WAV file called ‘output.wav’ by utilizing the ‘FileStream’ class, allowing for future …
Published in Journal of Artificial Intelligence Research & Advances · Vol. 12, Issue 1, 2025 · pp. 28–33 Read article
-
LTE & 5G NR Carrier Aggregation Network Optimization through Advanced Measurement Configuration
Abstract: The ability to merge numerous frequency carriers—component carriers—to increase transmission bandwidth and throughput speeds over what can be achieved with a single carrier is known as carrier aggregation, and it is a crucial technology in 4G LTE and 5G networks. Cellular devices may attain gigabit data speeds by combining carriers from several frequency bands, such as 600 MHz to mm Wave frequencies, to increase downlink and uplink capacity. This study …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 10, Issue 2, 2023 · pp. 35–45 Read article
-
Analysis of Different Level Half-Bridge Modular Multilevel Inverter
Abstract: Inverter is a power electronics device which is used to convert DC power to AC power at required output voltage and frequency. It can be broadly classified as two level inverters and multilevel inverters. The multilevel inverters are mainly classified as Diode clamped, Flying capacitor inverter and cascaded multilevel inverter. The design and operation of cascaded half bridge modular multilevel inverter (MMC) was very easy. Because, no clamping diode and …
Published in Journal of Power Electronics and Power Systems · Vol. 5, Issue 2, 2015 · pp. 1–8 Read article
-
Delta Sigma Fractional N Frequency Synthesis
Abstract: Frequency synthesizers are fast becoming essential for several broadcast bands and circuits as communication technology hasimproved. To meet this need, the fractional N frequency synthesizer was created. This synthesizer has proven its supremacy as a noteworthyinnovation by permitting various improvements over comparable concepts. Only when it is combined with delta-sigma modulation is thispossible. This combi- national circuit enhances frequency resolution and noise performance. PLL-based frequency synthesis is often used toproduce …
Published in Journal of VLSI Design Tools and Technology · Vol. 13, Issue 2, 2023 · pp. 12–20 Read article
-
The Practical Use of Cholesteric Liquid Crystal Film for Development of New Technologies
Abstract: The use of cholesteric liquid crystal films, using the remarkable property of cholesteric liquid crystals to change their color at the temperature changes, is well known for measuring temperature, in medicine, in jewelry and so on. The article presents the practical use of cholesteric liquid crystal films in the developed musical color device, which “animates” the pattern with a multi-colored color in accordance with the frequency spectrum of the signal …
Published in Journal of Thin Films, Coating Science Technology & Application Read article
-
The Practical Use of Cholesteric Liquid Crystal Film for Development of New Technologies
Abstract: The use of cholesteric liquid crystal films, using the remarkable property of cholesteric liquid crystals to change their color at the temperature changes, is well known for measuring temperature, in medicine, in jewelry and so on. The article presents the practical use of cholesteric liquid crystal films in the developed musical color device, which “animates” the pattern with a multi-colored color in accordance with the frequency spectrum of the signal …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 8, Issue 2, 2021 · pp. 24–30 Read article
-
Prevalence of Depression and Associated Factors among Ophthalmic Patients in Mekelle Quiha General Hospital Ophthalmic Clinic: A Cross-Sectional Study in North Ethiopia
Abstract: For people with ophthalmic disorders, depression is a very common problem. In Ethiopia, no study assessed the severity and related depression factors among ophthalmic patients. The research thus aimed at assessing the prevalence and factors associated depression in people with eye disease. From March 1–30, 2019, the institution-based cross-sectional study layout was conducted among 281 participants at the Mekelle Quiha General Ophthalmic Hospital. Data were collected using the Depression Patient …
Published in Research and Reviews: A Journal of Neuroscience · Vol. 10, Issue 1, 2020 · pp. 1–8 Read article
-
Exploring Polymer Substrates for CBSIW Antennas: Paper and Denim for Enhanced Gain and Bandwidth
Abstract: This paper presents a novel approach to antenna design by leveraging the unique properties of paper and Denim materials, both of which are polymers. This research underscores the potential of unconventional polymer materials like paper and jeans in antenna design, offering new avenues for the development of lightweight, flexible, and cost-effective communication devices for diverse wireless applications. The study focuses on the design and analysis of non-conventional substrate-based Circular Backed …
Published in Journal of Polymer & Composites · Vol. 12, Issue 3, 2024 · pp. 64–80 Read article
-
Prevalence and Associated Factors of Attention Deficit Hyperactivity Disorder in School Age Children in Mekelle, Tigray, North Ethiopia, 2017
Abstract: Introduction: Attention-Deficit Hyperactivity Disorder is a neuron developmental disorder. African children are affected with this disorder which rates from 5.4 to 8.7%. This study aimed to assess the prevalence of attention-deficit hyperactivity disorder and its associated factors among school age children at Mekelle city, Tigray, Ethiopia, 2016/17. Method: Cross-sectional survey among 541 children at randomly selected institution was conducted between December 2016 and May 2017. Data were collected using structured …
Published in Research and Reviews : A Journal of Medical Science and Technology · Vol. 7, Issue 2, 2018 · pp. 21–34 Read article
-
Determinants of Caesarean Delivery in Ayder Referral Hospital, Mekelle, Tigray, Ethiopia 2015: A Case Control Study
Abstract: Caesarean delivery rates have been increasing around the world from time to time, with current rates in developing countries comparable to other industrialized nations. International concern over such increases has prompted the World Health Organization to suggest that caesarean section rates should not exceed 15%. A study conducted in Ayder Referral Hospital indicated that the rate of caesarean section was 21.90%. The aim of the study was to assess the …
Published in Research and Reviews : A Journal of Medical Science and Technology · Vol. 5, Issue 1, 2016 · pp. 52–59 Read article
-
Determinants of Survival among Hemodialysis Patients at Ayder Comprehensive Specialized Hospital, Tigray, North Ethiopia: A Retrospective Cohort Study
Abstract: Background: Chronic kidney disease is a common public health problem with increase the incidence and prevalence, which nearly doubled as a cause of death worldwide. However, the access to care and knowledge about the predictors of survival among hemodialysis patients is extremely limited in Ethiopia. The aim of this study is, therefore, to identify predictors of survival among hemodialysis patients. Methods: A retrospective cohort study was conducted by reviewing records …
Published in Research and Reviews: Journal of Oncology and Hematology · Vol. 7, Issue 3, 2018 · pp. 22–29 Read article
-
A CPW Fed Inverted E-Shape Microstrip Patch Antenna for Multi Band Applications
Abstract: In this paper a CPW fed multi band monopole antenna with inverted E-shape micro strip patch is presented for radar/satellite applications. Ansys soft HFSS simulator is used to simulate the antenna in this paper. The proposed antenna consists of inverted E shape patch including finite ground CPW feeding. The antenna is fabricated on 1.5 mm FR4 substrate which has dielectric constant of 4.4 and loss tangent of 0.02. The operating …
Published in Journal of Microwave Engineering and Technologies · Vol. 2, Issue 3, 2015 · pp. 26–35 Read article
-
Structure Property Correlation of Polymer Dielectrics Using Electrical Response Data
Abstract: Polymer dielectrics are foundational to insulation, capacitors, embedded passives, and flexible electronics, where performance is governed by the frequency-dependent electrical response rather than a single dielectric constant. This study presents a spectroscopy-aware structure–property correlation framework that transforms dielectric response data into physically interpretable spectral fingerprints and learns mappings from polymer descriptors to these fingerprints for prediction and interpretation. Broadband spectra are standardized on a log-frequency grid and parameterized using relaxation-informed …
Published in Journal of Polymer & Composites · Vol. 14, Issue 3, 2026 · pp. 315–324 Read article
-
A Ventilated Dual-Function Photonic–Phononic Metasurface for Simultaneous Passive Radiative Cooling and Low-Frequency Noise Mitigation in Building Envelopes: Conceptual Design and Computational Feasibility Analysis
Abstract: Acoustic metamaterials for sound insulation and photonic/radiative-cooling metamaterials for passive thermal management have each matured separately for building-envelope retrofit, but existing studies address ventilation, acoustic damping and radiative thermal control in isolation, and no reported unit-cell architecture co-designs all three within a single shared structure. This gap persists because materials that are acoustic absorptive are generally dense and structurally opaque, whereas materials that are highly solar-reflective are conventionally applied to …
Published in International Journal of Energy and Thermal Applications · Vol. 4, Issue 2, 2026 Read article
-
Trans Multiplexer as a Bliss to SATCOM System
Abstract: The paper describes the importance and application of trans multiplexer (TMUX) in satellite communication system. Nowadays, the communication system is completely based on multi user system. Generally, cellular communication can be done with a fixed frequency bands which is narrow band system where as satellite communication is based on wide band system, where different standards can be used simultaneously. In this paper, the overall idea of how signal processing is …
Published in Current Trends in Signal Processing · Vol. 7, Issue 1, 2017 · pp. 42–46 Read article
-
True Random Number Generators Using A Postprocessor, Jitter Metastability, Tree-based Interleaver & Low-power CMOS inverter Circuit prototype technology: An Efficient Analysis
Abstract: TRNGs (True Random Number Generators) are cryptographic primitives that generate random numbers for critical operations. The goal of this study is to create a TRNG using a ring oscillator, analyse different calibration generating ways using VHDL spice simulation, and investigate the TRNG's essential design features, such as area, entropy, and power/energy consumption, using suggested and published methods. Random ones and zeros are produced using RO jitter and DCM frequency fluctuations. …
Published in Journal of Microcontroller Engineering and Applications · Vol. 10, Issue 1, 2023 · pp. 66–76 Read article
-
Academic Performance and Associated Factors among Students of Mekelle University, College of Health Sciences, 2015
Abstract: Refining students’ educational performance is the crucial element of higher educational institutions and prejudiced by multifactor. Hence, it is important to evaluate the factors affecting little academic accomplishments to address the issue. The objective of this study was to assess the magnitude and factors associated with low academic performance among students at Mekelle University, College of Health Sciences, 2015. Cross-sectional study was conducted among 356 regular undergraduate students at College …
Published in Research and Reviews : A Journal of Medical Science and Technology · Vol. 5, Issue 1, 2016 · pp. 17–21 Read article