급성하벽심근경색에서 전흉부유도 ST절 하강의 의의

정병천,배호상,곽동훈,김영태,배용학,황종현,임현주,류재근,조용근,채성철,전재은,박의현 慶北大學校 醫科大學 1997 慶北醫大誌 Vol.38 No.2

목적 : 급성하벽심근경색증 환자에서 심전도상 흔히 동반되는 전흉부유도 ST절 하강의 의의를 알아보았다. 방법 : 심근경색후 24시간에서 48시간에 얻은 심전도를 기준으로 52명의 급성하벽심근경색증 환자를 전흉부유도에서 ST절의 하강이 있는 군과 없는 군으로 나누었으며 심도자, 관상동맥조영술, 심초음파도 및 방사성 핵종을 이용한 좌심구혈율 측정 등을 시행하였다. 결과 : 1) 좌심실확장기말압은 전흉부유도에서 ST절의 하강이 있는 경우에서 16.9±5.33mmHg로 없는 경우의 11.0±4.02mmHg보다 유의하게 높았다(p<0.05). 그러나 운동량 및 좌심구혈을은 흥부 유도상 ST절의 하강이 있는 경우 7.6±3.0 METs 및 53.9±9.1%로 없는 경우의 9.1±2.7 METs 및 54.6±9.5%보다 낮았으나 통계적 유의성은 없었다(p=0.180, p=0.823). 2) 관상동맥조영술상 전흉부 ST절의 하강이 동반된 군에서는 유의한 좌전하행지나 좌회선지의 협착이 있는 경우가 60.9% 및 57.9%로 ST절의 하강이 없는 군에서의 34.5% 및 7.7%와 비교해 좌관상동맥에 협착이 동반된 경우가 많았다(p=0.050, p=0.001). 3) 관상동맥조영술상 세 혈관질환의 빈도는 흉부유도상 ST절의 하강을 보인 23예에서 10예로 ST절 하강이 없었던 29예중 2예에 비하여 유의하게 많았고(P=0.007), 단 혈관질환의 빈도는 ST절의 하강을 보인 군에서 23예중 5예로 ST절 하강이 없었던 29예중 17예에 비하여 유의하게 적었다(P=0.002). 두 혈관질환의 경우에는 각각 8예와 10예로 양군간에 유의한 차이가 없었다. 4) 흉부유도상 ST절 하강의 빈도는 단 혈관질환 22예 중 5예에서, 두 혈관질환 18예중 8예, 세 혈관질환 12예 중 10예에서 관찰되어 협착이 있는 관상동맥의 수가 많을수록 ST절의 하강이 나타나는 빈도가 많음을 보였다(p=0.00308). 그러나 흉부유도상 나타난 ST절의 하강을 모두 합하여 구한 ST절 하강의 합은 협착이 있는 관상동맥의 수와 통계적인 유의성이 없었다. 5) 심초음파도상 좌심실 하벽의 벽운동은 ST절 하강을 보인 군에서는 akinesia가 83.3%, hypokinesia가 11.1%, 정상 벽운동이 5.6%로, ST절 하강이 없었던 군에서의 dyskinesia가 3.6%, akinesia가 39.3%, hypokinesia가 25.0%, 정상 벽운동이 32.1%와 비교하여 ST절의 하강이 있는 군에서 유의하게 벽운동의 장애가 빈번함을 보였다(p=0.03891). 그러나 좌심실전벽, 측벽 및 중격부위에서는 유의한 벽운동의 차이가 없었다. 결론 : 급성하벽심근경색증 환자의 전흉부유도에서 ST절의 하강이 동반되는 경우 다혈관 질환의 가능성이 높으며 좌심실확장기말압이 상승되었고 운동능력은 감소되어 있었다. 또한 심초음파도상 좌심실하벽의 벽운동장애도 심하였다. 따라서 전흉부 ST절의 하강을 동반한 급성하벽심근경색증 환자는 전흉부유도에 ST절 하강이 없는 경우보다 예후가 불량할 것으로 생각되며, 보다 적극적인 치료가 필요할 것으로 생각된다. The purpose of this study was to determine the significance of precordial ST segment depression appearing during acute inferior myocardial infarction and to assess the correlation of that with angiographic finding. 52 patients were allocated into two groups based on the existence of precordial ST segment depression : 23 patients with ST segment depression and 29 patients without ST segment depression. The extent of coronary artery disease as well as the prevalence of significant stenosis (≥70%) in left anterior descending artery were more frequent in patients showing precordial ST segment depression than in patients not showing them (p=0.050) and the result were similar in cases of left circumplex artery (p=0.001). On echocrdiographic examination of left ventricular (LV) wall motion, it showed more severely decreased inferior LV wall motion in patients showing precordial ST segment depression than in patients not showing them (p=0.03891) even though the other segment of LV wall motion didn't show the statistical difference between both groups. The other cardiac parameters such as LVEDP, exercise amount (METs) and ejection fraction were tend to showing bad profile in patients with precordial ST segment depression. From the above results, we could deduce that patients with precordial ST segment depression have relatively large infarction or concomitant left coronary artery disease, so they need more caution and intensive theraphy.

Identification of Quantitative Trait Loci for agronomic trait accross two population in soybeans

Yong Ho Kwack,In Youl Baek,Sung Taeg Kang,Won Young Han,Su Dong Kim,Hyeun Kyeung Kim,Doo Chul Shin,Moung Gun Chung 한국육종학회 2002 한국육종학회 학술발표회 발표요지 Vol.34 No.1

Developing New Grape Cultivar ‘Doonuri’ for Desert and Wine Making

Yong Bum Kwack,Han Ik Jang,Yong Uk Shin,Kyo Sun Park,Hae Keun Yun,Jung Ho Noh,Seok Tae Jeong 한국원예학회 2008 한국원예학회 학술발표요지 Vol.2008 No.5

Nonstructural Carbohydrates of Non-fruiting Young Kiwifruit Vines as Affected by Early Defoliation

Yong-Bum Kwack,Hong Lim Kim,Won-Byoung Chae,Seung Heui Kim,Jae Han Lee,Eung Ho Lee,Yong-Bok Lee,Jin Gook Kim 한국원예학회 2013 한국원예학회 학술발표요지 Vol.2013 No.10

Analysis of QTLs for Leaflet Length and Width Based on Molecular Map in Soybean[Glycine max (L.) Merr.]

Yong Ho Kwack,Sung Taeg Kang,Su Dong Kim,Hyeun Kyeung Kim,In Youl Bak 한국육종학회 2002 한국육종학회 학술발표회 발표요지 Vol.34 No.2

Affection on Cane Germination and Floral Bud Reduction by Early Defoliation of Kiwifruit ‘Goldrush’

Yong-Bum Kwack,Hong Lim Kim,Jae Han Lee,Eung Ho Lee,Jin Gook Kim,Yong Bok Lee 한국원예학회 2013 한국원예학회 학술발표요지 Vol.2013 No.5

조기낙엽에 따른 참다래(골드러쉬) 무착과 유목 액아의 발아와 착화

곽용범 ( Yong Bum Kwack ),김홍림 ( Hong Lim Kim ),채원병 ( Won Byoung Chae ),이재한 ( Jae Han Lee ),이응호 ( Eung Ho Lee ),진국 ( Jin Gook Kim ),이용복 ( Yong Bok Lee ) 한국환경농학회 2013 한국환경농학회지 Vol.32 No.3

BACKGROUND: Kiwifruit, which was introduced to Korea in late 1970s, is a warm-temperate fruit tree, whose leaves are easily damaged by wind because of their large size. To produce high quality fruits, efficient windbreak is necessary to protect leaves until harvest. In Korea, typhoons from July onwards usually influence the production of kiwifruit. Damages from typhoons include low fruit quality in the current year and low flowering ratio the following year. This study was conducted to investigate the effect of early defoliation of kiwifruit vines from July to October on the regrowth of shoot axillary buds the current year and bud break and flowering the following year. METHODS AND RESULTS: Scions of kiwifruit cultivar ‘Goldrush’ were veneer grafted onto five?year?old Actinidia deliciosa rootstocks, planted in Wagner pots (13L) and grown in a rain shelter. Kiwifruit leaves in the proximity of leaf stalk were cut by lopping shears to simulate mechanical damage from typhoon since only leaf stalks were left when kiwifruit vines were damaged by typhoons. Kiwifruit vines were defoliated from July 15 to October 14 with one monthintervals and degrees of defoliation were 0, 25, 50, 75 and 100%. All experiments were conducted in the rain shelter and replicated at least five times. Defoliation in July 15 resulted in a high regrowth ratio of 20?40% regardless of degree of defoliation but that in August 16 showed only 5.8% of regrowth ratio in the no defoliation treatment; however, more than 25% of defoliation in August 16 showed 17?23% of regrowth ratio. In September 15, regrowth ratio decreased further to less than 10% in all treatments and no regrowth was observed in October 14. Percent bud break of all defoliation treatments were not significant in comparison to 64.7% in no defoliation except for 42.1% and 42.9% in 100% defoliation in July 15 and August 16, respectively. Floral shoot in the no defoliation treatment was 70.2% and defoliation of 50% or less resulted in the same or increased floral shoot ratio in July 15, August 16, and September 15; however, defoliation in October 14 showed no difference in all treatments. In flower number per floral shoot, 2?3 flowers appeared in no defoliation and only 1 flower was observed when the vines were defoliated more than 50% in July 15 and September 15. In October 14, contrary to the floral shoot ratio, flower number decreased with increased defoliation. CONCLUSION(S): Therefore, it is suggested that dormancy of ‘Goldrush’ axillary buds, was started in August and completed in October. The effect of defoliation on bud break of axillary buds the following year was insignificant, except for 100% defoliation in July 15 and August 16. From July 15 to September 15, floral bud ratio was significantly reduced when more than 50% of leaves were defoliated compared to no defoliation. Also, the number of flowers per flower?bearing shoot the following year decreased by less than 50% when compared to no defoliation, and this decrease was more prominent in September 15 than July 15 and August 16.

Optical and structural properties of In_0.5Ga_0.5As quantum dots with different numbers of stacks grown by atomic layer molecular beam epitaxy: vertical realignment of weakly coupled quantum dots

Kwack, Ho-Sang,Kim, Byoung-O,Cho, Yong-Hoon,Song, Jin-Dong,Choi, Won-Jun,Lee, Jung-Il IOP Pub 2007 Nanotechnology Vol.18 No.31

<P>We have investigated optical and structural properties of various In<SUB>0.5</SUB>Ga<SUB>0.5</SUB>As quantum dot (QD) structures as a function of stacking number, grown by atomic layer molecular beam epitaxy (ALE). We found that the excitation power and temperature dependence of well-separated two emissions from 10 stacked InGaAs QD samples are different from those of other QDs with the stacking numbers of 1, 3 and 5. Although the GaAs spacer thickness is ∼35 nm at which the strain field penetration can be ignored for Stranski–Krastanov mode-grown InAs QDs, our ALE-grown QDs are influenced by the strain field penetration due to the larger size of ALE QDs. From transmission electron microscopic images, we observed that the ten stacked QD sample has a complex QD size distribution predominantly due to vertical size variation with stacking and that upper stacked (5–10) QD layers are vertically realigned due to the merged strain field penetration between laterally coupled QDs. </P>

A New Hairless Baby Kiwifruit ‘Bangwoori’

Yong-Bum Kwack(곽용범),Pong-Nyul Paek(백봉렬),Kyeong-Ho Chung(정경호),Jeong-Hwan Hwang(황정환) 한국원예학회 2008 한국원예학회 학술발표요지 Vol.2008 No.12

비타민 C가 풍부한 참다래는 세계적으로 ‘헤이워드’라는 단일 품종이 거의 대부분 재배되고 있어 재배 농가와 소비자의 선택의 폭이 매우 좁다. 농촌진흥청 남해출장소에서는 기존의 우점 품종인 ‘헤이워드’를 대체하고 다양한 새로운 형질을 지닌 시장성이 있는 품종을 육성하기 위해 1984년부터 육종 프로그램을 운영해 오고 있다. 1989년 국내에서 수집된 자생 다래에 ‘토무리’를 교배하여 나온 실생 중에 특성이 우수한 계통을 2000년에 1차 선발하였으며, 2001~2005년까지 특성 검정을 통해 2006년에 최종 선발하였다. 과육은 녹색이며, 과실의 껍질에는 털이 없다. 과중은 평균 21g 정도이며, 평균 당도는 14.5°Brix이다. 수확기는 10월 상?중순이며, 과피 색은 과실 생장 초기에는 녹색이나 수확기에 이르러 녹색바탕에 부분적으로 갈색을 띤다. 생육 후반기에 그늘짐에 의한 낙엽이 발생할 수 있으므로 수관 하부가 지나치게 그늘지지 않도록 유의해야 한다. Commercial planting of kiwifruit in Korea is mainly done with ‘Hayward’. Consumers and producers’ choice of cultivars and the enjoyment of this attractive fruit with abundant vitamin C are very limited. We have had breeding programs to improve the dominant cultivar, ‘Hayward’, and to diversify marketable cultivars having such characters as novel flesh color, hairlessness, etc. since 1984. ‘Bangwoori’ was born as a cross of mother plant Actinidia arguta collected from Korean mountains and the pollinizer A. deliciosa ‘Tomuri’. It has a mouthful fruit size without skin hair. It was selected firstly in 2000 and finally released in 2006 after evaluation of characteristics for more than 3 years. It has green flesh color, no hair on fruit skin, 21 g of average fruit weight, 14.5°Brix of soluble solids content and picking is usually done in early to mid October. It has green skin in early time of fruit enlargement, and scab-like brown spot or stripe appears partially in late fruit development. Shading of canopy might cause early defoliation.

'Redvita': A Yellow-fleshed Kiwifruit with Red Color Around the Core

Kwack, Yong-Bum,Kim, Hong-Lim,Lee, Jae-Han,Chung, Kyeong-Ho,Chae, Won Byoung Korean Society of Horticultural Science 2017 원예과학기술지 Vol.35 No.3

Kiwifruits introduced to Korea typically have green fruit flesh, yellow flesh, or yellow flesh with red coloration around the core. Here, we describe a new cultivar called 'Redvita', the first kiwifruit cultivar of Korea with yellow flesh and red coloration around the core. A conventional field cross was conducted in 2003, and permission for the final release of 'Redvita' was obtained in 2012. 'Redvita' originates from 'Red Princess', a maternal vine known for the red coloration in its flesh. The pollinizer is 'NHK0013' (IT233175), which blooms in early May. A principal feature of 'Redvita' is its high vitamin C content, which at an average of 140 mg per 100 g of fresh weight is 2 - 4 times higher than other commercial cultivars. The average fruit weight is 97 g; bigger than that of the control cultivar 'Hongyang'. 'Redvita' blooms in mid-May and is usually harvested in early to mid-October, approximately 150 - 160 days after anthesis. 'Redvita' produces 3 or 4 flowers per fruiting shoot, with no small lateral flowers, therefore does not need to be thinned before blooming for commercial production. The cultivar is acidulous because of a high titratable acidity content (about 1.5%), which is higher than other cultivars (less than 1.0%). 'Redvita' was registered with the Korean Seed and Variety Service in 2015 for plant variety protection rights (no. 5604).