The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Fuada Syifaul - One of the best experts on this subject based on the ideXlab platform.
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PengembanganTrainer Osilator Analog berbasis IC Op-Amp (Studi Kasus Penelitian R&D di JTE FT UM)
'Universitas PGRI Madiun', 2018Co-Authors: Fuada Syifaul, Elmunsyah Hakkun, Suwasono SuwasonoAbstract:Makalah ini merupakan penelitian pengembangan (R&D) yang menghasilkan seperangkat produk media pembelajaran praktikum sistem instrumentasi analog, yaitu pembangkit sinyal (osilator) yang terdiri dari atas produk yakni: (1) alat peraga atautrainer yang terdiri atas osilator Phase Shift RC; osilator Wien Bridge; osilator Hartley; osilator Colpitts; dan Astable Multivibrator. (2) Modul praktikum pegangan dosen dan modul praktikum untuk mahasiswa, serta (3) Manual Bookyang merupakan petunjuk penggunaan alat peraga. Objek peneltian dilakukan di Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Malang (JTE FT UM) yang dilatarbelakangi oleh perlunya alat peraga osilator dilabolatoriumnya untuk menunjang kelancaran kegiatan pembelajaran. Ketiga produk telah diuji coba baik secara fungsional maupun uji kelayakan pemakaian produk yang dilakukan pada 3 (tiga) kelompok responden yakni: Ahli media, Ahli materi,dan mahasiswa. Hasil penelitian menunjukkan bahwa produk telah memenuhi kriteria valid dari para ahli dan mendapat respon positif dari mahasiswa praktikan. Dengan demikian perangkat media yang dikembangkan sudah layak untuk digunakan dalam pembelajaran praktikum
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Pembuatan Trainer Board Astable Multivibrator (AM) sebagai Media Pembelajaran
'Perpustakaan Universitas Andalas', 2016Co-Authors: Fuada SyifaulAbstract:Trainer board is a modelling device approach which has related function or same with real pheneonom, it was designed for upgrading the cognitive and the psychomotoric ability of students in a practical courses understanding and applicating concepts. This research goals is to make a trainer board of Astable Multivibrator oscillator, we hope that this learning tools can help them in facilitate to learn Astable Multivibrator characteristics as well as laboratories insfrastructure need. The method in design and implement this trainer board is prototyping and assembling with several approach steps, i.e. identification; simulation; experiment, design process; fabrication; and finally is testing. The results show that the trainer board which designed is appropriate with the theorem.Keywords : Astable Multivibrator, IC OP-AMP, Trainer boardAbstrak—Trainer board merupakan suatu pemodelan dalam bentuk benda/objek yang memiliki fungsi sama dengan fenomena nyata, dibuat dengan tujuan untuk meningkatkan kemampuan secara aspek kognitif dan psikomotorik dalam mempelajari suatu pembelajaran berbasis praktik. Penelitian ini bertujuan untuk membuat trainer board yang diharapkan dapat membantu memudahkan peserta didik dalam memahami karakteristik Astable Multivibrator berbasis IC OP-AMP sekaligus sebagai pemenuhan kebutuhan labolatorium. Metode yang digunakan dalam penelitian ini adalah prototyping and assembling dengan beberapa tahap pendekatan yakni: Identifikasi, simulasi, eksperimen percobaan, proses desain/perancangan, fabrikasi dan testing. Hasil penelitian menunjukkan bahwa trainer board yang telah dibuat sesuai dengan teorema.Kata Kunci : Astable Multivibrator, IC OP-AMP, Trainer boar
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MEDIA PEMBELAJARAN ANALOG OSCILLATOR VIRTUAL LABOLATORY
'Universitas Pembangunan Nasional Veteran Yogyakarta', 2016Co-Authors: Wibowo, Aji Widhi, Fuada SyifaulAbstract:The purpose of this research is to design and implement a Virtual Labolatory Materials Signal Processing Sub discussion 'Oscillator' Analog as Newspapers. Developers using the model Sutopo Ariesto Hadi (2003) as a method to produce the product. Consists of six stages: concept, design, material collecting, assembly, testing and distribution. This results in the development of Virtual media Labolatory with material 'Oscillator' with the results of 4 (four) practicum digital oscillator, namely (1) Oscillator Wien Bridge, (2) Colpitts oscillator, (3) Oscillator Hartley and (4) Astable Multivibrator. Another result is that a user be jobsheet practicum. There are two types, namely: (1) jobsheet grip lecturers and (2) jobsheet for students. In Jobsheet there is a short book that contains the Manual on procedures for the use of virtual labolatory when practical and anatomical description of the product. Virtual Labolatory consists of the initial page (flash scren), the main page (home), pages and pages about the developer's lab referring to the story board. There are four (4) test are: (1) the truth polarity capacitor, (2) the connection (wiring), (3) mode frequency and time in the meter frequenc
Syifaul Fuada - One of the best experts on this subject based on the ideXlab platform.
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Pembuatan Trainer Board Astable Multivibrator (AM) sebagai Media Pembelajaran
Universitas Andalas, 2016Co-Authors: Syifaul FuadaAbstract:Trainer board is a modelling device approach which has related function or same with real pheneonom, it was designed for upgrading the cognitive and the psychomotoric ability of students in a practical courses understanding and applicating concepts. This research goals is to make a trainer board of Astable Multivibrator oscillator, we hope that this learning tools can help them in facilitate to learn Astable Multivibrator characteristics as well as laboratories insfrastructure need. The method in design and implement this trainer board is prototyping and assembling with several approach steps, i.e. identification; simulation; experiment, design process; fabrication; and finally is testing. The results show that the trainer board which designed is appropriate with the theorem
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Desain dan Implementasi Virtual Laboratory Materi Osilator Analog berbasis IC OP-AMP
Teknik Elektro Institut Teknologi Nasional Bandung, 2016Co-Authors: Syifaul Fuada, Aji Widhi WibowoAbstract:ABSTRAK Laboratorium virtual merupakan salah satu platform laboratorium modern yang dapat mendukung kegiatan praktikum yang berjalan secara tradisional (Hand-on Laboratory).Penelitian ini bertujuan untuk mendesain dan mengimplementasikan Virtual Laboratory pada materi pembangkit sinyal dengan subtopik: Wien Bridge sebagai osilator RC, Hartley dan Colpitts sebagai osilator LC dan Astable Multivibrator sebagai osilator relaksasi,yang dibangun berbasis IC Operational Amplifier (OP-AMP).Jenis penelitian ini merupakan R&Dyang terdiri dari enam tahapan, yaitu:konsep, desain, pengumpulan bahan, pembuatan, pengujian dan pendistribusian. Aplikasi perangkat lunak berbasis dekstop ini telah diuji secara fungsional dengan 6 (enam) aspek parameter yakni:uji polaritas kapastor; uji wiring; uji mode frekuensi dan mode perioda pada alat ukur frequency generator; uji specific decission pada trainer kit osilator hartley dan colpitts; uji kesesuaian antara frekuensi ouput dari masing-masing osilator dengan perhitungan teorema dan hasil percobaan sesungguhnya; dan uji kualitas media. Hasil secara keseluruhan telah sesuai dengan ekspektasi didalam story board. Kata kunci: IC OP-AMP, Osilator analog, Laboratorium virtual ABSTRACT The Virtual Laboratory is as one of modern laboratory platform which able to supportthe hand-on worklab. The goal of this research are for designing and implementing a Virtual Laboratory of signal generator material with subtopics i.e. the Wien Bridge as an RC oscillator, the Hartley and Colpitts as LC oscillator and the Astable Multivibrator as relaxation oscillator which assembled based on Operational Amplifier Integrated Circuit (OP-AMP).This research is R&D type which consists of six stages, i.e. concept, design, materials collection, assembling, testing and distribution. This desktop-based software application has been functionally tested with six aspect of parameters such as: capacitor polarity testing; wiring testing; testing of frequency mode and period mode in frequency counter instrument; Specific decission test of the hartley and colpitts oscillator; fit-test for comparasion results between output frequency from each of oscillators with theorem calculations and actual experimental results; and quality test of media. The overall results was in line in expectations based on the story board. Keywords: Analog oscillator, IC OP-AMP, Virtual Laboratory
Weiling Chen - One of the best experts on this subject based on the ideXlab platform.
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Bilateral photoplethysmography for peripheral arterial disease screening in haemodialysis patients using Astable Multivibrator and machine learning classifier
IET Science Measurement & Technology, 2019Co-Authors: Jian-xing Wu, Weiling ChenAbstract:Peripheral arterial disease (PAD) is highly prevalent in haemodialysis (HD) patients with type 2 diabetes. Atherosclerosis may occur in both lower and upper peripheral arteries, causing progressive dialysis access stenosis in HD patients. To assess the risk of PAD, non-invasive bilateral photoplethysmography (PPG) can be used to obtain continuous variations in blood flow volume in in vivo examinations. The authors propose an Astable Multivibrator to model the peripheral circulation system and to produce PPG oscillation with time constants, duty ratio (rising time), and amplitude ratio of systolic and diastolic pressures. Then, the bilateral differences in the time constant and duty ratio are used to separate the normal condition from PAD. The machine learning decision-making process utilises a screening method to automatically detect subjects with and without the risk of PAD. The radial-based function is employed to parameterise the similarity and dissimilarity levels using probability values. Colour relation analysis incorporates the probability values into the perceptual colour relationships for PAD screening. The experimental results indicate that in comparison with bilateral timing parameters, degree of stenosis, and resistive index, the proposed screening method is efficient in preventing complications of PAD and is easily implemented in an embedded system.
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an equivalent Astable Multivibrator model to assess flow instability and dysfunction risk in in vitro stenotic arteriovenous grafts
Technology and Health Care, 2016Co-Authors: Chiahung Lin, Chung Dann Kan, Weiling ChenAbstract:Narrowed vessel accesses produce blood flow changes, and induce flow instability and vessel wall vibration, resulting in blood pressure, flow velocity, and flow resistance increases. The vessel wall vibrates and propagates the low axial blood flow, as representing the resistance (R) to blood flow. The compliance is a blood pressure-blood volume relation, representing the systole and diastole capacity of the blood vessel. These dynamic behaviors increase blood flow resistances and reduce blood vessel compliances. Vibration phenomena result on the elastic vessel walls and induce simple harmonic motion due to transverse vibration pressure (TVP). The rise time, amplitude, and pulse duration of transverse waves are determined by the flow resistances (R) and vessel compliances (C). Thus, a stenotic arteriovenous access has high resistance and low compliance, which can be expressed an Astable Multivibrator as an equivalent model consisting of a lumped resistor (R) and a lumped capacitor (C). TVP's oscillation frequency, rise time, and amplitude are determined by the flow resistances and vessel compliances. Hence, an Astable Multivibrator is used to model TVP parameters to estimate negative time constants, τ=(R× C), which are used to evaluate the flow instability and the dysfunction risk in in-vitro arteriovenous grafts (AVGs). Experimental results show the average negative time constants have the positive correlation as the degree of stenosis (DOS) increases (R2 = 0.8944), and their variations with the flow resistance and vessel compliance are also validated. Positive pole values, s=(-1/τ), are used to show that the force responses of the vessel walls grow in a finite time, 0.5415 ± 7.60 × 10-3 sec, and the equivalent model would be also unstable as DOS increases (R2 = 0.8802). By comparison with hemodynamic analysis, the finding of proposed model can be further carried out for screening AVG dysfunction risk during hemodialysis treatment.
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assessment of flow instabilities in in vitro stenotic arteriovenous grafts using an equivalent Astable Multivibrator
Iet Science Measurement & Technology, 2015Co-Authors: Weiling Chen, Chung Dann Kan, Yu Hsuan Lin, Chiahung LinAbstract:In clinical examinations, narrowed vessel accesses will produce unsteady flow and cause changes in blood flow volume. These phenomena result in pressure, velocity and flow resistance increases and induce stress on vessel walls. The vessel wall vibrates and squeezes the low axial blood flow, a lumped resistor (R) representing resistance to blood flow. The compliance is a pressure against blood volume relationship, a lumped capacitor (C) representing the compliance capacity of the blood vessel. Vibration phenomena results on the elastic vessel wall because of transverse vibration pressure. Turbulent and instability flow will induce simple harmonic motions, and the rise time, amplitude and pulse duration of transverse vibrations are determined by the flow resistances and vessel compliances. Hence, an Astable Multivibrator as detection model employs time constant, τ = (R × C), to evaluate the flow instability and the dysfunction risk in in-vitro arteriovenous grafts (AVGs). Experimental results show the time constants have linear regression with a positive correlation as the degree of stenosis increases. Positive pole values, s = (−1/τ), are used to validate that the AVG be unstable because the force responses will continuously grow with time because of vibration increases. For comparison with the computerised analysis and auscultation method, in-vivo examinations of the proposed equivalent model can be further carried out for screening of AVG dysfunction.
Chiahung Lin - One of the best experts on this subject based on the ideXlab platform.
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an equivalent Astable Multivibrator model to assess flow instability and dysfunction risk in in vitro stenotic arteriovenous grafts
Technology and Health Care, 2016Co-Authors: Chiahung Lin, Chung Dann Kan, Weiling ChenAbstract:Narrowed vessel accesses produce blood flow changes, and induce flow instability and vessel wall vibration, resulting in blood pressure, flow velocity, and flow resistance increases. The vessel wall vibrates and propagates the low axial blood flow, as representing the resistance (R) to blood flow. The compliance is a blood pressure-blood volume relation, representing the systole and diastole capacity of the blood vessel. These dynamic behaviors increase blood flow resistances and reduce blood vessel compliances. Vibration phenomena result on the elastic vessel walls and induce simple harmonic motion due to transverse vibration pressure (TVP). The rise time, amplitude, and pulse duration of transverse waves are determined by the flow resistances (R) and vessel compliances (C). Thus, a stenotic arteriovenous access has high resistance and low compliance, which can be expressed an Astable Multivibrator as an equivalent model consisting of a lumped resistor (R) and a lumped capacitor (C). TVP's oscillation frequency, rise time, and amplitude are determined by the flow resistances and vessel compliances. Hence, an Astable Multivibrator is used to model TVP parameters to estimate negative time constants, τ=(R× C), which are used to evaluate the flow instability and the dysfunction risk in in-vitro arteriovenous grafts (AVGs). Experimental results show the average negative time constants have the positive correlation as the degree of stenosis (DOS) increases (R2 = 0.8944), and their variations with the flow resistance and vessel compliance are also validated. Positive pole values, s=(-1/τ), are used to show that the force responses of the vessel walls grow in a finite time, 0.5415 ± 7.60 × 10-3 sec, and the equivalent model would be also unstable as DOS increases (R2 = 0.8802). By comparison with hemodynamic analysis, the finding of proposed model can be further carried out for screening AVG dysfunction risk during hemodialysis treatment.
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assessment of flow instabilities in in vitro stenotic arteriovenous grafts using an equivalent Astable Multivibrator
Iet Science Measurement & Technology, 2015Co-Authors: Weiling Chen, Chung Dann Kan, Yu Hsuan Lin, Chiahung LinAbstract:In clinical examinations, narrowed vessel accesses will produce unsteady flow and cause changes in blood flow volume. These phenomena result in pressure, velocity and flow resistance increases and induce stress on vessel walls. The vessel wall vibrates and squeezes the low axial blood flow, a lumped resistor (R) representing resistance to blood flow. The compliance is a pressure against blood volume relationship, a lumped capacitor (C) representing the compliance capacity of the blood vessel. Vibration phenomena results on the elastic vessel wall because of transverse vibration pressure. Turbulent and instability flow will induce simple harmonic motions, and the rise time, amplitude and pulse duration of transverse vibrations are determined by the flow resistances and vessel compliances. Hence, an Astable Multivibrator as detection model employs time constant, τ = (R × C), to evaluate the flow instability and the dysfunction risk in in-vitro arteriovenous grafts (AVGs). Experimental results show the time constants have linear regression with a positive correlation as the degree of stenosis increases. Positive pole values, s = (−1/τ), are used to validate that the AVG be unstable because the force responses will continuously grow with time because of vibration increases. For comparison with the computerised analysis and auscultation method, in-vivo examinations of the proposed equivalent model can be further carried out for screening of AVG dysfunction.
Antonio Riccardo Buonomo - One of the best experts on this subject based on the ideXlab platform.
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a new cmos Astable Multivibrator and its nonlinear analysis
International Journal of Circuit Theory and Applications, 2011Co-Authors: Antonio Riccardo BuonomoAbstract:We present a nonlinear analysis of a new inductively tuned Astable Multivibrator obtained by connecting a timing inductor across a composite nonlinear resistor with a characteristic of N-type, which is made up of the parallel connection of two complementary pairs of cross-coupled MOS devices. Some possible practical applications of the circuit are also envisaged. Closed-form expressions for the amplitude and the period of the periodic oscillation are derived in both cases when the circuit exhibits a relaxation oscillation and in the more difficult case when, due to the effect of parasitic capacitances of the devices, the circuit has an almost-discontinuous relaxation oscillation with a nonzero switching time. The accuracy of the presented formulas, which are useful for both the analysis and design, is validated through circuit simulations and experimental results. Copyright © 2009 John Wiley & Sons, Ltd.
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an inductively tuned cmos Astable Multivibrator
International Symposium on Circuits and Systems, 2008Co-Authors: Antonio Riccardo BuonomoAbstract:A new inductively tuned Astable Multivibrator is presented. The circuit is formed connecting a timing inductor across a composite nonlinear two-terminal, which is made up of two complementary pairs of cross-coupled MOS devices. The nonlinear differential equation describing the circuit is derived, which is solved for the oscillation period by quadrature. Exact expressions for both the amplitude and the period of the relaxation oscillation are found, as well as some useful approximations of them. Circuit simulations confirm the presence of a relaxation oscillation which is accurately predicted by the presented nonlinear analysis.
