Dong-Youn Kim
Pusan National University
Imaging phantomInverterSignalPhase (waves)OpticsPhysicsEngineeringControl engineeringResistorFilter (video)PhotonVoltageOffset (computer science)ChemistryEnergy (signal processing)Projection (set theory)Water treatmentMaterials scienceMedical physicsObservational errorElectronic engineeringSodium carbonateRippleWater qualityLinear compressorControl methodsImage noiseEnvironmental scienceComputer scienceChemical engineeringSimulationAlkalinityCapacitorCarbon dioxideControl theorySubtractionDetective quantum efficiencyEnvironmental engineeringPulse-width modulationDetector
24Publications
5H-index
70Citations
Publications 23
Newest
#1Dong-Youn Kim (PNU: Pusan National University)H-Index: 5
#2Jae-Sung Ma (PNU: Pusan National University)H-Index: 1
Last. Jang-Mok Kim (PNU: Pusan National University)H-Index: 20
view all 3 authors...
This paper describes a method for reducing the common mode voltage in seven phase brushless DC motor(BLDCM) application. The conventional interleaved method used in the three phase inverter system has been extended and applied. The proposed phase-phase interleaved method is studied to apply the six-phase excitation method for controlling seven-phase BLDCM. The six-phase switching functions related with modulation index(MI) and interleaved angle are obtained. And the average of common mode voltag...
1 CitationsSource
#1Chang-Hwan ParkH-Index: 2
#2Dong-Youn KimH-Index: 5
Last. Jang-Mok KimH-Index: 20
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To reduce the cost of the inverter system in home appliances, a method using a shunt resistor at the DC-link can be substituted for a method using two current sensors at the inverter output. However, the minimum time of the active vector is required to sample the accurate current using a 1-shunt resistor. Therefore, many studies have been conducted investigating current reconstruction methods in the unmeasurable region of the current. The conventional methods using voltage injection have some pr...
4 CitationsSource
Source
#1J. Yun (PNU: Pusan National University)H-Index: 2
#2Dong-Youn Kim (PNU: Pusan National University)H-Index: 5
Last. Ho Kyung Kim (PNU: Pusan National University)H-Index: 21
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For digital x-ray tomosynthesis of thin slab objects, we compare the tomographic imaging performances obtained from the filtered backprojection (FBP) and simultaneous algebraic reconstruction (SART) algorithms. The imaging performance includes the in-plane molulation-transfer function (MTF), the signal difference-to-noise ratio (SDNR), and the out-of-plane blur artifact or artifact-spread function (ASF). The MTF is measured using a thin tungsten-wire phantom, and the SDNR and the ASF are measure...
Source
#1Yongkan Ki (PNU: Pusan National University)H-Index: 7
#2Wontaek Kim (PNU: Pusan National University)H-Index: 10
Last. Jiho Nam (PNU: Pusan National University)H-Index: 6
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Source
#1Jung Nam Kim (PNU: Pusan National University)H-Index: 7
#2Dong-Youn Kim (PNU: Pusan National University)H-Index: 5
Last. Ho Kyung Kim (PNU: Pusan National University)H-Index: 21
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For single-shot dual-energy (DE) imaging, a sandwich detector typically consists of a thin front detector and a thick rear detector. Therefore, the spatial-resolution characteristics of the two detectors are different, and as a result, weighted subtraction of the corresponding two images gives rise to edge-enhancement characteristics in the resulting DE images. This is a unique characteristic of single-shot DE imaging compared to the conventional dual-shot DE imaging which uses the same detector...
5 CitationsSource
#1Dong-Youn Kim (PNU: Pusan National University)H-Index: 5
#2Jung Nam Kim (PNU: Pusan National University)H-Index: 7
Last. Ho Kyung Kim (PNU: Pusan National University)H-Index: 21
view all 5 authors...
Active sandwich-like multilayer detectors have been developed, and their potential for motion-artifact-free dual-energy x-ray imaging at a single exposure has been demonstrated in the material decomposition context. Since the sandwich detector uses the x-ray beam transmittance through the front layer, direct x-ray interaction within photodiodes in the front layer is unavoidable, and which can increase noise in the front detector images. Similar direct x-ray interaction can also occur in the rear...
5 CitationsSource
#2Joonseok Park (PNU: Pusan National University)H-Index: 7
For the purpose of designing an x-ray detector system for cargo container inspection, we have investigated the energy-absorption signal and noise in CdWO4 detectors for megavoltage x-ray photons. We describe the signal and noise measures, such as quantum efficiency, average energy absorption, Swank noise factor, and detective quantum efficiency (DQE), in terms of energy moments of absorbed energy distributions (AEDs) in a detector. The AED is determined by using a Monte Carlo simulation. The res...
Source
#1Seong Hyun Kim (PNU: Pusan National University)H-Index: 10
#2Dong-Youn Kim (PNU: Pusan National University)H-Index: 5
Last. Ho Kyung Kim (PNU: Pusan National University)H-Index: 21
view all 6 authors...
An x-ray radiographic system consisting of two detectors in tandem, or a sandwich detector, can produce dual-energy image from a single-shot exposure. Subtraction of two images obtained from the two detectors can produce a sharper image through an unsharp masking effect if the two images are formed at different spatial resolutions. This is indeed possible by incorporating different thicknesses of x-ray conversion layers in the detectors. In this study, we have developed a microtomography system ...
6 CitationsSource
#1Dong-Youn Kim (PNU: Pusan National University)H-Index: 5
#2Jong-Joo Moon (PNU: Pusan National University)H-Index: 4
Last. Jong-Seung Ji (LG Electronics)H-Index: 1
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This paper proposes the novel sensorless control algorithm for 3-Phase BLDC motors with trapezoidal back-EMF. The proposed algorithms include both the new back-EMF estimation method by using the DC current model and a compensator for the electric parameter errors of the BLDC motor to improve performance of sensorless control more exactly. The back-EMF can be easily calculated from the electrical voltage equation. However, it has some errors at the commutation period. This error can be reduced by...
2 CitationsSource