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Development of an Eddy Current Braking System for an e-Mobility Application
Jongoh Park,Yongmin Kwon,Youngho Kwon,Donghyun Lee,Seokwon Kwon,Seokju Kim,Gilsu Choi,Woongkul Lee 한국차세대컴퓨팅학회 2021 한국차세대컴퓨팅학회 학술대회 Vol.2021 No.11
This paper presents the design process of an Eddy Current Brake (ECB) system for an electric scooter application. In order to obtain sufficient braking force in the limited space of the electric scooter’s braking system, the impact of three key variables, air gap length, brake disc thickness, and magnet grade, are studied and analyzed by using three-dimensional (3D) finite element (FE) analysis. The braking torque of the ECB is also analyzed using FE analysis. Finally, an experimental setup is fabricated using a 1 kW brushless DC (BLDC) motor that was used in a commercial electric scooter, and preliminary results of measuring the rotational speed of the brake disc are presented.
Effects of Imagery Tennis Training on Cerebral Activity
( Seokwon Jung ),( Min Sun Choi ),( Min Uk Kim ),( Hye Jin An ),( Min Gyeong Shin ),( Oh Young Kwon ) 대한임상검사과학회 2015 대한임상검사과학회지(KJCLS) Vol.47 No.1
The previous studies showed that the visual imagery activated the occipital and posterior inferior temporal area of the brain, and the damage to the occipital cortex impaired the visual mental imagery. We studied current-source distribution of electroencephalography (EEG) to observe neuronal activity during imagery tennis playing. Eleven healthy volunteers were enrolled. All volunteers were right-handed males and novices for tennis playing. The mean age of them was 24.9 years. The EEGs were recorded on the scalp electrodes located according to the International 10∼20 System. The number of electrodes was 25 channels including subtemporal electrodes. The EEG recording session was 13 min including 5 segments: resting-I, scenery-slide show, resting-II, watching tennis-game video, and imagery-tennis playing. The recoding durations were 3, 2, 3, 2, and 3 min respectively. Five ‘artifact free 3-sec segments’ were selected in each segment of ‘imagery-tennis playing’ and ‘resting-II’. We did the frequency domain analysis with the EEG segments using a distributed model of current-source analysis. The statistical-nonparametric maps (SnPMs) were obtained between the segments of ‘imagery-tennis playing’ and the segments of ‘resting-II’ (p<0.01). The significant change of current-source density was observed only in alpha-2 frequency band (10∼12 Hz). The current-sourcedensity was increased in the hippocampus, parahippocampus, and occipital fusiform gyrus in the right cerebral hemisphere (p<0.01). Imaginary-tennis playing may activate the hippocampal-occipital alpha networks of nondominant hemisphere.
Effects of Imagery Tennis Training on Cerebral Activity
Jung, Seokwon,Choi, Min-sun,Kim, Min-uk,An, Hye-jin,Shin, Min-gyeong,Kwon, Oh-Young 대한임상검사과학회 2015 대한임상검사과학회지(KJCLS) Vol.47 No.1
The previous studies showed that the visual imagery activated the occipital and posterior inferior temporal area of the brain, and the damage to the occipital cortex impaired the visual mental imagery. We studied current-source distribution of electroencephalography (EEG) to observe neuronal activity during imagery tennis playing. Eleven healthy volunteers were enrolled. All volunteers were right-handed males and novices for tennis playing. The mean age of them was 24.9 years. The EEGs were recorded on the scalp electrodes located according to the International 10~20 System. The number of electrodes was 25 channels including subtemporal electrodes. The EEG recording session was 13 min including 5 segments: resting-I, scenery-slide show, resting-II, watching tennis-game video, and imagery-tennis playing. The recoding durations were 3, 2, 3, 2, and 3 min respectively. Five 'artifact free 3-sec segments' were selected in each segment of 'imagery-tennis playing' and 'resting-II'. We did the frequency domain analysis with the EEG segments using a distributed model of current-source analysis. The statistical-nonparametric maps (SnPMs) were obtained between the segments of 'imagery-tennis playing' and the segments of 'resting-II' (p<0.01). The significant change of current-source density was observed only in alpha-2 frequency band (10~12 Hz). The current-sourcedensity was increased in the hippocampus, parahippocampus, and occipital fusiform gyrus in the right cerebral hemisphere (p<0.01). Imaginary-tennis playing may activate the hippocampal-occipital alpha networks of nondominant hemisphere.
Ryu, Nari,Lee, Seokwon,Park, Hong-Joon,Lee, Byeonghyeon,Kwon, Tae-Jun,Bok, Jinwoong,Park, Chan Ik,Lee, Kyu-Yup,Baek, Jeong-In,Kim, Un-Kyung Elsevier BV 2017 Gene Vol.627 No.-
<P><B>Abstract</B></P> <P>Hereditary hearing loss (HHL) is a common genetically heterogeneous disorder, which follows Mendelian inheritance in humans. Because of this heterogeneity, the identification of the causative gene of HHL by linkage analysis or Sanger sequencing have shown economic and temporal limitations. With recent advances in next-generation sequencing (NGS) techniques, rapid identification of a causative gene <I>via</I> massively parallel sequencing is now possible. We recruited a Korean family with three generations exhibiting autosomal dominant inheritance of hearing loss (HL), and the clinical information about this family revealed that there are no other symptoms accompanied with HL. To identify a causative mutation of HL in this family, we performed whole-exome sequencing of 4 family members, 3 affected and an unaffected. As the result, A novel splicing mutation, c.763+1G>T, in the solute carrier family 17, member 8 (<I>SLC17A8</I>) gene was identified in the patients, and the genotypes of the mutation were co-segregated with the phenotype of HL. Additionally, this mutation was not detected in 100 Koreans with normal hearing. <I>Via</I> NGS, we detected a novel splicing mutation that might influence the hearing ability within the patients with autosomal dominant non-syndromic HL. Our data suggests that this technique is a powerful tool to discover causative genetic factors of HL and facilitate diagnoses of the primary cause of HHL.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NGS is a powerful method to facilitate discovery and diagnosis of causative factors in genetic hearing loss. </LI> <LI> We performed whole exome sequencing to screen the genetic cause of autosomal dominant non-syndromic hearing loss. </LI> <LI> A probably pathogenic, novel splicing mutation was found in the <I>SLC17A8</I> gene. </LI> <LI> Our results provide essential information to understand hearing loss caused by a splicing mutation in the <I>SLC17A8</I> gene. </LI> </UL> </P>
Park, Kyung Min,Kwon, Chang Woo,Choi, Seung Jun,Son, Young-Hwan,Lim, Seokwon,Yoo, YoonJung,Chang, Pahn-Shick American Chemical Society 2013 Journal of agricultural and food chemistry Vol.61 No.39
<P>Thermostability of the lipase (EC 3.1.1.3) was found to be increased by the enzyme-entrapment in 50 mM AOT/isooctane reverse micelles. The half-life (15.75 h) of Pseudomonas fluorescens lipase entrapped in reverse micelles at 70 °C was 9.72- and 11.41-fold longer than those solubilized in a glycerol pool or in 10 mM phosphate buffer (pH 8.0), respectively. The enzyme deactivation model considering a two-step series-type was employed, and deactivation constants for the second step (<I>k</I><SUB>2</SUB>) at all temperatures were drastically decreased after the lipase was entrapped in reverse micelles. In particular, <I>k</I><SUB>2</SUB> (0.0354 h<SUP>–1</SUP>) at 70 °C in reverse micelles was 12.33- and 13.14-fold lower than in a glycerol pool or in the phosphate buffer, respectively. The deactivation energies (from <I>k</I><SUB>1</SUB>, <I>k</I><SUB>2</SUB>) for the lipase entrapped in the reverse micelles, solubilized in a glycerol pool, or in the aqueous buffer were 7.51, 26.35 kcal/mol, 5.93, 21.08 kcal/mol, and 5.53, 17.57 kcal/mol, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2013/jafcau.2013.61.issue-39/jf402539m/production/images/medium/jf-2013-02539m_0007.gif'></P>
Comparative Analysis of Traction Machines for Micro EV Applications
Seokju Kim,Mingyu Choi,Kwanhui Jang,Seokwon Kwon,Mingyu Park,Gunwoo An,Seorin Hwang,Gilsu Choi 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.10
This paper presents the results of a comparative analysis of two traction machines designed for micro electric vehicle (EV) applications. First, a commercial traction motor used in Renault Twizy was selected as the baseline model. Then, a new permanent magnet (PM) motor was designed to improve the performance of the Twizy motor. The performance of the PM motor was verified by comparing the efficiency maps of the two motors. Finally, the EV energy consumption model was used to compare the EV range and the total energy consumption between the two motors.