Imaging Characteristics of Perosomus elumbis in a Puppy

Choi, Sooyoung,Lee, Byungho,Lee, Byungdon,Seo, Jiwon,Park, Hyunyoung,Kwon, Kyunghun,Lee, Youngwon,Choi, Hojung The Korean Society of Embryo Transfer 2015 한국동물생명공학회지 Vol.30 No.4

A 4-day-old, male Poodle dog was presented with dull, depressed and exhausted activity after the birth. On physical examination, the puppy showed arthrogryposis, muscular atrophy and no movement of hindlimbs. Palpation on dorsum revealed an absence of lumbar and sacral vertebrae. On prenatal and postnatal radiography, lumbar vertebrae, sacrum and coccygeal vertebrae were not visualized. On ultrasonography, bilateral kidney and urinary bladder were observed. On computed tomography, there were no apparent abnormalities in the forelimbs, cervical vertebrae or head, while lumbar vertebrae, sacrum and coccygeal vertebrae were not observed. At necropsy examination, the liver, stomach, intestine, kidney and urinary bladder were normal. This congenital anomaly was consistent with Perosomus elumbis. Perosomus elumbis in dogs is a rare condition of unknown etiology. In this report, Perosomus elumbis was evaluated with radiography, ultrasound and computed tomography.

Imaging Characteristics of Perosomus elumbis in a Puppy

Sooyoung Choi,Byungho Lee,Byungdon Lee,Jiwon Seo,Hyunyoung Park,Kyunghun Kwon,Youngwon Lee,Hojung Choi 한국수정란이식학회 2015 한국동물생명공학회지 Vol.30 No.4

A 4-day-old, male Poodle dog was presented with dull, depressed and exhausted activity after the birth. On physical examination, the puppy showed arthrogryposis, muscular atrophy and no movement of hindlimbs. Palpation on dorsum revealed an absence of lumbar and sacral vertebrae. On prenatal and postnatal radiography, lumbar vertebrae, sacrum and coccygeal vertebrae were not visualized. On ultrasonography, bilateral kidney and urinary bladder were observed. On computed tomography, there were no apparent abnormalities in the forelimbs, cervical vertebrae or head, while lumbar vertebrae, sacrum and coccygeal vertebrae were not observed. At necropsy examination, the liver, stomach, intestine, kidney and urinary bladder were normal. This congenital anomaly was consistent with Perosomus elumbis. Perosomus elumbis in dogs is a rare condition of unknown etiology. In this report, Perosomus elumbis was evaluated with radiography, ultrasound and computed tomography.

GOCI-Ⅰ, Ⅱ 대기상층(TOA) 반사도를 이용한 한반도 미세먼지 농도 추정

최현영(Choi, Hyunyoung),박선영(Park, Seonyoung),강유진(Kang, Yoojin),송상현(Song, Sanghyeon),성태준,임정호(Im, Jungho) 한국측량학회 2021 한국측량학회 학술대회자료집 Vol.2021 No.11

기계학습을 활용한 동아시아 지역의 TROPOMI 기반 SO₂ 지상농도 추정

최현영 ( Hyunyoung Choi ),강유진 ( Yoojin Kang ),임정호 ( Jungho Im ) 대한원격탐사학회 2021 大韓遠隔探査學會誌 Vol.37 No.2

대기 중의 이산화황(SO₂)은 주로 인위적 배출원에 의해 발생하며 화학 반응을 통해 (초)미세먼지를 형성하여 직간접적으로 주변 환경 및 인체 건강에 해로운 영향을 주는 물질이다. 특히 지상에서의 농도는 인간 활동과 밀접한 관련이 있어 모니터링의 필요성이 매우 크다. 따라서, 본 연구에서는 TROPOMI SO₂ 연직 컬럼 농도 산출물 및 타 위성 산물과 모델 산출물 등을 융합 활용하여 기계학습 기법에 적용하여 SO₂ 지상 농도 추정모델을 개발하였다. 기계학습 기법으로는 널리 활용되고 있는 RF(Random Forest)에 잔차 보정 과정을 결합한 2-step 잔차 보정 RF를 적용하였다. 개발된 모델은 무작위, 공간 및 시간별 10-fold 교차 검증을 통하여 검증하였으며, 기울기(slope) 값이 1.14-1.25, 상관계수(R) 값이 0.55-0.65, rRMSE 값이 약 58-63% 정도로 나타났다. 이는 잔차 보정이 적용되지 않은 기존의 RF 대비 slope의 경우 약 10%, R과 rRMSE의 경우 약 3% 가량 향상된 결과를 보인다. 국가별로 나누어 분석하였을 때에는 샘플 수가 적고 SO₂의 전반적인 농도가 낮은 일본 지역에서의 공간별 10-fold 교차검증 성능이 소폭 감소하는 것으로 나타났다. SO₂ 지상농도 분포를 계절별로 표출하였을 때, 일본의 경우 다른 지역 대비 연중 저농도가 관찰되며 높은 결측 값 비율로 인하여 관측소 농도 대비 2-step 잔차 보정 RF 모델에서 과대 모의하는 경향이 관찰되었다. 대표적 고농도 발생지인 중국의 YRD(Yangtze River Delta) 와 한국의 SMA(Seoul Metropolitan Area)의 계절적 분포 변화를 추가적으로 분석하였을 때, 연료 연소로 인한 겨울철 농도 증가 패턴이 나타났다. 이는 인위적 배출원의 영향을 크게 받는 SO₂의 시공간적인 분포 특성을 잘 반영하고 있는 결과이다. 따라서, 본 연구를 통하여 제안한 모델은 장기적으로 SO₂ 지상 농도의 시공간적 분포를 파악하는 데에 활용될 수 있을 것으로 기대된다. Sulfur dioxide (SO₂) in the atmosphere is mainly generated from anthropogenic emission sources. It forms ultra-fine particulate matter through chemical reaction and has harmful effect on both the environment and human health. In particular, ground-level SO₂ concentrations are closely related to human activities. Satellite observations such as TROPOMI (TROPOspheric Monitoring Instrument)- derived column density data can provide spatially continuous monitoring of ground-level SO₂ concentrations. This study aims to propose a 2-step residual corrected model to estimate ground-level SO₂ concentrations through the synergistic use of satellite data and numerical model output. Random forest machine learning was adopted in the 2-step residual corrected model. The proposed model was evaluated through three cross-validations (i.e., random, spatial and temporal). The results showed that the model produced slopes of 1.14-1.25, R values of 0.55-0.65, and relative root-mean-square-error of 58-63%, which were improved by 10% for slopes and 3% for R and rRMSE when compared to the model without residual correction. The model performance by country was slightly reduced in Japan, often resulting in overestimation, where the sample size was small, and the concentration level was relatively low. The spatial and temporal distributions of SO₂ produced by the model agreed with those of the in-situmeasurements, especially over Yangtze River Delta in China and Seoul Metropolitan Area in South Korea, which are highly dependent on the characteristics of anthropogenic emission sources. The model proposed in this study can be used for long-term monitoring of ground-level SO₂ concentrations on both the spatial and temporal domains.

Control of gas permeability by transforming the molecular structure of silk fibroin in multilayered nanocoatings for CO₂ adsorptive separation

Choi, Moonhyun,Heo, Jiwoong,Kim, Hyunyoung,Kang, Sang Wook,Hong, Jinkee Elsevier 2019 Journal of membrane science Vol.573 No.-

<P><B>Abstract</B></P> <P>Carbon dioxide (CO<SUB>2</SUB>) is considered one of the causes of global warming because anthropogenic CO<SUB>2</SUB> concentration in the atmosphere has greatly increased. The objective of this work was to design silk fibroin (SF) and graphene oxide (GO) membranes with very high CO<SUB>2</SUB> gas capture characteristics and high gas selectivity toward nitrogen rather than CO<SUB>2</SUB> gas, and to demonstrate the effect on transforming the SF secondary structure at the molecular level. GO-NH<SUB>3</SUB> <SUP>+</SUP>/SF multilayer nanocoatings were fabricated by automatic spray-assisted layer-by-layer (LbL) assembly with physical molecular interaction between GO-NH<SUB>3</SUB> <SUP>+</SUP> and SF. We demonstrated transformation of the SF secondary structures in GO-NH<SUB>3</SUB> <SUP>+</SUP>/SF LbL-assembled nanocoatings with MeOH solvent treatment. After MeOH treatment, the SF secondary structures in the GO-NH<SUB>3</SUB> <SUP>+</SUP>/SF LbL-assembled nanocoatings preferred β-sheets to random coils. This phenomenon affects the internal amine groups and CO<SUB>2</SUB> transport. The MeOH-treated GO-NH<SUB>3</SUB> <SUP>+</SUP>/SF LbL-assembled nanocoatings have high β-sheet content, and the gas permeability of the nanocoatings was quite different. Before the predominance of the β-sheet, CO<SUB>2</SUB> gas permeated twice as fast as nitrogen (N<SUB>2</SUB>) gas in the GO-NH<SUB>3</SUB> <SUP>+</SUP>/SF LbL-assembled nanocoatings. On the other hand, CO<SUB>2</SUB> gas was transmitted 10-times slower than N<SUB>2</SUB> gas in MeOH-treated GO-NH<SUB>3</SUB> <SUP>+</SUP>/SF LbL-assembled nanocoatings. In other words, we successfully fabricated a CO<SUB>2</SUB> adsorptive separation membrane with GO-NH<SUB>3</SUB> <SUP>+</SUP> and SF.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spray-assisted GO-NH<SUB>3</SUB> <SUP>+</SUP>/SF LbL nanocoatings were fabricated by physical molecular interaction. </LI> <LI> With MeOH treatment, molecular structures of GO-NH<SUB>3</SUB> <SUP>+</SUP>/SF LbL nanocoatings were changed and have more β-sheet configuration. </LI> <LI> CO<SUB>2</SUB>/N<SUB>2</SUB> gas selectivity of GO-NH<SUB>3</SUB> <SUP>+</SUP>/SF LbL nanocoatings with changing secondary structure was dramatically changed. </LI> <LI> MeOH treated (GO-NH<SUB>3</SUB> <SUP>+</SUP>/SF)<SUB> <I>25</I> </SUB> LbL nanocoatings have the best performance for CO<SUB>2</SUB> separation (N<SUB>2</SUB>/CO<SUB>2</SUB> selectivity: 10.02). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Effect of Colostrum Administration through Oral Mucosal Stimulation on the Infection and Feeding Intolerance for Very Low Birth Weight Infants

Hyunyoung Seo,Yoona Choi 한국간호과학회 2023 한국간호과학회 학술대회 Vol.2023 No.11

Development of heat-resistant insulation coatings for pure iron SMCs (Soft Magnetic Composites)

Kwangdeok Choi,SoYeon Lee,Hyunyoung Kim,Jong-seung Hwang,Joo-youl Huh,Kyung-Woo Yi,Ji Young Byun 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2

순철 SMCs (Soft Magnetic Composites)는 높은 자속 밀도, 우수한 성형성, 낮은 철손 및 높은 투자율을 나타낸다. 그러나 SMCs core를 만들기 위해 순철 분말을 가압 할 때 strain이 발생하고, 성형 공정 동안 생성된 residual strain 이 SMC core의 철손을 증가시킨다. strain을 제거하기 위해서는 고온 어닐링 공정이 필요하다. 그러나, 고온 어닐링 공정으로 SMCs 절연막의 열화로 인해 입자간 와전류 손실이 증가하여 열처리 온도에 한계가 있다. 일반적인 인산염 절연 코팅의 내열 온도는 400°C로 알려져 있어 residual strain을 제거하기에 충분하지 않다. 본 논문에서는 SMCs의 내열성을 향상시키기 위한 새로운 절연 코팅 방법을 제안하였다. 순철 분말(Hoganas ABC100.30)의 표면을 고온 산화에 의해 산화물 물질로 코팅한다. 그리고 silicone resin을 코팅하면 내열 온도가 600°C까지 상승하는 것으로 관찰되었다. 어닐링 열처리 온도의 영향에 대한 절연층 분석 및 SMC 코어의 자기 특성의 자세한 논의는 발표를 통해 설명하고자 한다.

Imaging Characteristics of Perosomus elumbis in a Puppy

Sooyoung Choi,Byungho Lee,Byungdon Lee,Jiwon Seo,Hyunyoung Park,Kyunghun Kwon,이영원,최호정 사단법인 한국동물생명공학회 2015 한국동물생명공학회지 Vol.30 No.4

A 4-day-old, male Poodle dog was presented with dull, depressed and exhausted activity after the birth. On physical examination, the puppy showed arthrogryposis, muscular atrophy and no movement of hindlimbs. Palpation on dorsum revealed an absence of lumbar and sacral vertebrae. On prenatal and postnatal radiography, lumbar vertebrae, sacrum and coccygeal vertebrae were not visualized. On ultrasonography, bilateral kidney and urinary bladder were observed. On computed tomography, there were no apparent abnormalities in the forelimbs, cervical vertebrae or head, while lumbar vertebrae, sacrum and coccygeal vertebrae were not observed. At necropsy examination, the liver, stomach, intestine, kidney and urinary bladder were normal. This congenital anomaly was consistent with Perosomus elumbis. Perosomus elumbis in dogs is a rare condition of unknown etiology. In this report, Perosomus elumbis was evaluated with radiography, ultrasound and computed tomography.

Optimal scan delay depending on contrast material injection duration in abdominal multi-phase computed tomography of pancreas and liver in normal Beagle dogs

Sooyoung Choi,In Lee,Jiwon Seo,Hyunyoung Park,최호정,이영원 대한수의학회 2016 Journal of Veterinary Science Vol.17 No.4

This study was conducted to establish the values for optimal fixed scan delays and diagnostic scan delays associated with the bolus-trackingtechnique using various contrast material injection durations in canine abdominal multi-phase computed tomography (CT). This studyconsisted of two experiments employing the crossover method. In experiment 1, three dynamic scans at the porta hepatis were performed using5, 10 and 15 sec injection durations. In experiment 2, two CT scans consisting of five multi-phase series with different scan delays of 5 secintervals for bolus-tracking were performed using 5, 10 and 15 sec injection duration. Mean arrival times to aortic enhancement peak (12.0,15.6, and 18.6 sec for 5, 10, and 15 sec, respectively) and pancreatic parenchymal peak (17.8, 25.1, and 29.5 sec) differed among injectiondurations. The maximum mean attenuation values of aortas and pancreases were shown at the scan section with 0 and 5, 0 and 10 and 5 and10 sec diagnostic scan delays during each injection duration, respectively. The optimal scan delays of the arterial and pancreatic parenchymalphase in multi-phase CT scan using fixed scan delay or bolus-tracking should be determined with consideration of the injection duration.

자동차 전장용 LED 패키지 국제기준 분석

이현영(Hyunyoung Lee),정진욱(Jin-uk Jeong),최현석(Hyunseok Choi),나종혁(Jonghyuk Na),권기태(Kitae Kwon),이세현(Sehyun Lee) 한국조명·전기설비학회 2018 한국조명·전기설비학회 학술대회논문집 Vol.2018 No.5