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Yongseok Mun,Seng Chan You,Da Yun Lee,Seok Kim,Yoo-Ri Chung,Kihwang Lee,Ji Hun Song,Young Gun Park,Young Hoon Park,Young-Jung Roh,Se Joon Woo,Kyu Hyung Park,Rae Woong Park,Sooyoung Yoo,Dong-Jin Chang 한국역학회 2021 Epidemiology and Health Vol.43 No.-
OBJECTIVES: The aim of this study was to evaluate the real-world incidence of endophthalmitis after intravitreal anti-vascular endothelial growth factor (VEGF) injections using data from the Observational Medical Outcomes Partnership (OMOP) Common Data Model (CDM). METHODS: Patients with endophthalmitis that developed within 6 weeks after intravitreal anti-VEGF injections were identified in 3 large OMOP CDM databases. RESULTS: We identified 23,490 patients who received 128,123 intravitreal anti-VEGF injections. The incidence rates of endophthalmitis were 15.75 per 10,000 patients and 2.97 per 10,000 injections. The incidence rates of endophthalmitis for bevacizumab, ranibizumab, and aflibercept (per 10,000 injections) were 3.64, 1.39, and 0.76, respectively. The annual incidence has remained below 5.00 per 10,000 injections since 2011 despite the increasing number of intravitreal anti-VEGF injections. Bevacizumab presented a higher incidence rate for endophthalmitis than ranibizumab and aflibercept (incidence rate ratio, 3.17; p=0.021). CONCLUSIONS: The incidence of endophthalmitis after intravitreal anti-VEGF injections has stabilized since 2011 despite the explosive increase in anti-VEGF injections. The off-label use of bevacizumab accounted for its disproportionately high incidence of endophthalmitis. The OMOP CDM, which includes off-label uses, laboratory data, and a scalable standardized database, could provide a novel strategy to reveal real-world evidence, especially in ophthalmology.
YongSeok Choi,YunGyu Nam,InSuWhang,DeogGee Park,KwangRyul Choe 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.10
In the case of one standard-mum polyvinyl house, the density of F. occidentalis reached its peak in early June and decreased after the chemical control, which was carried out periodically. In the case of another standard-mum polyvinyl house, the density of F. occidentalis increased continuously in spite of the periodical chemical control after planting. In both polyvinyl houses, the density of F. occidentalis began to increase mid-May. The numbers of F. occidentalis collected on a tray with wet paper by heating the flowers of pink, white, and yellow Chrysanthemum standard mums were 18.4, 56.6, and 52.6 after flowering, but in the case of the leaves, the numbers were 7.8, 16.6, and 15.4. Also, the numbers of F. occidentalis collected on a tray with wet paper by heating the buds of pink, white, and yellow Chrysanthemum standard mums were 15.2, 45.8, and 41.6, but in the case of the leaves, the numbers were 2, 8.8 and 3.4. In the Y-tube olfactometer test, the frequency of F. occidentalis’ visits to one side arm of the Y-tube olfactometer was higher in the odor cue of the white flower than of the yellow, red, and violet flowers, but in the other combinations without white flowers, the frequency was higher in the odor cue of the violet and red flowers than of the yellow flowers. In the case of the four-choice olfactometer test, in the same visual cues as the odor cues of the pot mum flowers, the frequency of F. occidentalis was higher in the yellow flower than in the other flowers (white, red, and violet) in all the observation times (10, 15, and 20 minutes). In the case of the visual cues with disturbed odor cues, F. occidentalis preferred the yellow color to the other colors in all the observation times (10, 20, and 40 minutes). F. occidentalis preferred the white color to the other colors when the same odor cues as the flower color were provided, but the odor cue of the yellow flower was provided only without the color cue.
YongSeok Choi,InSu Whang,DeogGee Park,KwangRyul Choe 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.05
Developmental time, mummification, pupal mortality, sex ratio of a South Korean strain of Aphelinus varipes Förster parasitizing the green peach aphid, Myzus persicae were studied at 20, 25 and 30℃ in controlled climate cabinets. Plastic container with sweet pepper(Capsicum annuum L.) were used as experimental units. Green peach aphid in different larval instars and as adults, reared at the three different temperatures, were presented to A. varipes in a 'no-choice' and 'choice' situation for 6h. These presentations were done at 25℃ in each experiment to avoid an influence of temperature on parasitization rate. In case of no-choice test, more 1st(24%), 2nd(22%) and 3rd(38%) instar aphids were parasitized than 4th(14%) instar and adult(10%) among the aphids reared at 25℃. In case of choice test, more 1st(41%), 2nd(42%) and 3rd(29%) instar aphids were parasitized than 4th(13%) instar and adult(0%) among the aphids reared at 25℃. Pupal mortality of the parasitoid was not influenced by temperatures. The sex ratio of A. varipes was male-biased, and varied between 49.4% females developed from aphids reared at 30℃ and 42.8% from aphids reared at 20℃. The sex ratio was not significantly influenced by host stages. The developmental time of A. varipes parasitizing the green peach aphid ranged from 26.1days at 20℃ to 11.1days at 30℃.
A novel one-body dual laser profile based vibration compensation in 3D scanning
Lim, Yongseok,Choi, Woong,Park, Yongju,Oh, Sangwook,Kim, Younghun,Park, Jongsun Elsevier 2018 MEASUREMENT -LONDON- Vol.130 No.-
<P><B>Abstract</B></P> <P>Recently, the 3D laser profile scanner has often been used for the precise measurement of 3D surface information (object surface) such as height, area, and slope. However, a difficulty encountered with the conventional laser scanning method is that it cannot compensate for the errors resulting from vibration, so the scanned object should be measured in a fixed (immobile) state. In this paper, we propose a novel dual laser profile method and its error compensation algorithm to compensate for vertical vibration, even with a moving object. In order to remove errors caused by vibration, the proposed system projects two laser profiles onto the surface, such that the projected position overlaps the one with the previous position. With the overlapped position, the height difference between the measured objects is used to calculate the vibration errors. To generate two laser profiles simultaneously, we present a novel approach for generating two laser profiles from one laser-emitting source (a one-body dual line laser using a triangular structured blazed grating reflector). By exploiting the one-body dual line laser and error compensation algorithm, the proposed 3D laser profile scanner system achieves an error reduction of about 96.3% in the root mean square error (RMSE), compared to the conventional approach.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Overlapping two laser profiles with time difference allows vibration compensation. </LI> <LI> One laser source generates two precise laser profiles using grating structure. </LI> <LI> Global compensation algorithm corrects error from superimposing two laser profiles. </LI> </UL> </P>
이용석(Yongseok Lee),박현춘(Hyunchun Park),박종일(Jongil Park),김기두(Kidoo Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
가스 엔진은 희박 연소 기술을 통해 NOx배출량 감소 및 효율 상승이 가능하여 엔진 시장에서 수요가 증가하고 있다. 당사에서는 2010년 실린더 직경 350㎜의 예혼합 연소실 타입의 희박 연소 가스 엔진을 성공적으로 개발하였다. 본 연구에서는 개발 엔진의 효율 향상을 위해 가스엔진 연소시스템의 주요 구성 요소인 예혼합 연소실, 피스톤 바울, 흡기 포트 및 밸브 타이밍에 대한 최적 설계 안을 성능 및 연소 해석으로 도출하고, 엔진 성능 실험을 통해 검증하였다. 실험 결과를 통해 연소 속도의 증가가 최대 압력, 노킹, NOx 배출량과 밀접한 연관이 있으며, 연소 특성을 최적화할 수 있는 적정 연소 속도 구현으로 효율 향상이 가능함을 알 수 있었다. 당사 엔진의 적정 연소 속도를 구현할 수 있도록 연소 시스템의 주요 구성요소를 최적화함으로써 목표 효율을 달성할 수 있었다.
박원일(Wonil Park),김용석(Yongseok Kim),박기수(Kisoo Park),이석기(Sukki Lee) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.12
야간 악천후의 도로 환경은 운전자가 안전한 주행환경을 유지하기에 많은 시각적 제약이 있다. 특히, 주행 차선의 시인성이 저하되면 차량이 차로를 이탈하고 교통사고가 발생하기도 한다. 일반적으로 차선에 유리알 비드(Bead)를 살포한 후 재귀반사 효과를 통해 차선의 시인성을 확보하고 있으나, 야간 및 악천후 시에는 효과가 적고 일정 시간이 경과하면 그 성능은 급격하게 저하된다. 따라서, 국내외에서는 야간 악천후 시 차선의 시인성을 확보하기 위해 발광형 차선을 개발하고 있다. 그러나 이에 대한 검증은 부족한 실정이며 특히, 운전자에게 가장 위험한 환경인 야간 악천후 환경에서의 성능 검증은 거의 전무하다. 따라서, 본 연구에서는 실규모의 야간 악천후 환경을 구현하고 다양한 외부 조명 조건에서 일반 차선 대비 발광형 차선의 성능을 휘도 값 비교를 통해 검증 하였다. 그 결과로 백색차선과 발광형 차선의 휘도 차이는 최대 4.65cd/㎡를 보였다. 또한, 발광형 차선은 백색차선 대비 악천후 시 휘도 감소율이 낮았으며, 외부조명이 전혀 없는 경우에도 일정 휘도 값을 보여 종합적으로 야간 악천후 시 백색차선 대비 높은 휘도 성능을 보였다. Driving at nighttime is a difficult task for drivers mainly due to visual restrictions. In particular, higher accident risk at nighttime compared to daytime explains this difficulty. Especially, a lowered visibility of pavement markings leads to run-off-the road accidents. A conventional pavement marking utilizing a glass bead with the retro-reflecting mechanism has been widely used in practice. However, the loss of a considerable portion of glass beads with time diminishes the visibility dramatically leading to serious problems. Recently, luminescent lane marking has been under development to overcome the problems associated with glass bead markings by fertilizing the physical property of the luminescent. However, the validation of visibility robustness of a luminescent lane under adverse weather conditions needs to be performed to derive its superiority over conventional markings. To this end, this study simulated real scale weather proving ground and tested the performance of a luminescent lane by measuring the luminance. The results suggested that the luminance difference between conventional and luminescent markings was 4.65 cd/㎡. In addition, luminescent markings showed higher performance in terms of reduction rate due to adverse weather. Under worst-case scenarios such as roads without lightings and vehicle headlights, luminescent markings provided higher luminance than pavement. Moreover, no difference was observed between conventional lane marking and a pavement background. It means that the safety margin was attained in the luminescent marking condition even under worst-case road-illuminated conditions.