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김가인(Ga-In Kim),양세동(Se-Dong Yang),손현수(Hyeon-Su Son),강현식(Hyeon-Sik Kang),박영훈(Young-Hoon Park),신민호 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
This paper power supply design and control method of plasma system used in LCD and semiconducter cleaning processes. both poles in the load included capacitors for using a multijet method for increase efficient the cleaning processes. Therefore, Occur unbalanced current at the power supply output current because both poles capacitors. Occured unbalanced current be improved design and control method that using series L and PWM Duty control, its be proved a stable supply of power.
건강한 젊은 성인에서 액상 물질 한 모금 삼킴량의 측정
김수익 ( Su Ik Kim ),강지훈 ( Ji Hun Kang ),이동익 ( Dong Ik Lee ),조정열 ( Jeong Ryul Jo ),김형준 ( Hyung Jun Kim ),이재백 ( Jae Baek Lee ),진영호 ( Young Ho Jin ),정태오 ( Tae Oh Jeong ),윤재철 ( Jae Chol Yoon ) 대한임상독성학회 2013 대한임상독성학회지 Vol.11 No.2
Purpose: The aim of this study is to estimate one mouthful volume in a single swallow and average volume per swallow (AVS) in multiple swallows in the situation of toxic liquid poisoning. Methods: Thirty five men and 35 women were included in this study. Each subject was asked to drink one swallow and three consecutive swallows from bottle containing water and a bottle containing saline separately. We calculated one mouthful volume in a single swallow and AVS in three swallows. One mouthful volume and AVS were compared according to sex and content, respectively. One mouthful volume of water and saline was then compared with AVS of each. Results: Sixty seven adults(34 men; 26.9±3.2 years, 33 women; 25.6±2.4 years) completed the study. Men had larger one mouthful volume of water(49.1±19.9 ml vs 39.7±10.2 ml, p=0.02) and saline(20.7±10.9 ml vs 14.0±4.6 ml, p=0.004) and AVS of water(28.5±11.9 ml vs 21.5±5.9 ml, p=0.004) and saline(11.9±6.3 ml vs 7.9±2.0 ml, p=0.001) than women. One mouthful volume and AVS of saline swallow were lower than those of water swallow. AVS of three consecutive swallows was lower than one mouthful volume in water and saline swallow. Conclusion: We suggest that one mouthful volume in a single swallow is 21 ml in men and 14 ml in women and AVS in multiple swallows is 12 ml in men and 8 ml in women. AVS in multiple swallows is two-threefold lower than reference values(20~30 ml) commonly used in poisoning study.
김문관 ( Mun-kwan Kim ),박수현 ( Su-hyeon Park ),강형철 ( Hyeong-cheol Kang ),오태철 ( Tae-cheol Oh ),박용석 ( Yong-seok Park ),안영일 ( Young-il An ),김석종 ( Suk-jong Kim ) 한국어업기술학회 2017 수산해양기술연구 Vol.53 No.2
To improve the efficiency of hairtail trolling, it is important to gain an accurate understanding of the distribution of fish based on their diurnal vertical migration patterns. This study evaluated the vertical distribution of hairtails through catch efficiency tests using vertical longlines. Five replicate tests of the efficiency were carried out on the eastern coast of Jeju Island from August to September 2016, from 11:00 AM to 03:00 PM in the daytime and 11:00 PM to 03:00 AM in the nighttime. The fishing gear was composed of 20 hooks per line set, numbered in order from the first hook near the surface to the last hook on the seabed. The depth of the first hook was 18 m, and that of the last hook was 86 m. Pacific saury was used as the baits. In total, 10 sets of fishing gear were used per trip. After fishing, we counted the hairtails at each numbered hook, which were summed up both by number and in aggregate. A total of 232 hairtails were caught using 2,000 hooks: 193 individuals at daytime and 39 at nighttime. The hook rate was 11.5% : 9.6% at daytime; 2.0% at nighttime. For both daytime and nighttime catches, there were variations in the hook rates at each numbered hook. In the daytime, a maximum of 28.5% catches occurred at hook number 18, followed by 21.4% at number 20, and 10.7% at number 17, accounting for 60.6% of the daytime hook rates. In the nighttime, a maximum of 23.0% catches occurred at hook number 1, followed by 15.3% at hook number 4 and 9, accounting for 53.6% of the nighttime hook rate. Based on the above results, hairtails are usually distributed in deeper region in daytime, whereas they occur near the surface in nighttime. Therefore, it is necessary to position trolling lines according to diurnal vertical distribution layers of hairtails for fishing efficiency.
A deep learning based method for maxillofacial bone segmentation in CBCT images
Su Yang(양수),Se-Ryong Kang(강세룡),So-Young Chun(천소영),Ji-Yong Yoo(유지용),Jin Kim(김진),Da El Kim(김다엘),Won-Jin Yi(이원진) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
Cone-beam computed tomography (CBCT) images of the oral and maxillofacial region are commonly used in diagnosing and planning for surgical or orthodontic treatment to correct maxillofacial deformities. It is clinically essential to reconstruct a three dimensional model of maxillofacial structures for orthognathic surgery planning. However, this manual process is very tedious, challenging, and time-consuming. To resolve this problem, we proposed a deep learning based method for mandible and maxilla segmentation in CBCT images. Experimental results show that the proposed network achieves higher performance in all tasks than the baseline segmentation method.
김용인 ( Yong In Kim ),노기철 ( Ki Cheul Noh ),강영준 ( Young Joon Kang ),임용수 ( Yong Su Lim ),양혁준 ( Hyuk Jun Yang ),이근 ( Gun Lee ),진욱 ( Wook Jin ),황성연 ( Seong Youn Hwang ) 대한외상학회 2004 大韓外傷學會誌 Vol.17 No.2
Background: Simple cervical X-rays often miss cervical spine injuries. Magnetic resonance imaging is valuable in these cases. The aims of this study is to determine high-risk factors of the cervical injuries, and to contribute to make indications of cervical MRI in evaluation of blunt trauma patients. Methods: We retrospectively reviewed the patients who visited our ED due to nuchal pain and examed by simple cervical X-ray and cervical MRI after blunt trauma. We analyzed the incidence of abnormal MRI findings in various patients groups. We also compared the incidence of missed cervical spine injury by level of injured spine. We thought cervical MRI to be goldstandard of this analysis. Results: The incidence of abnormality on cervical MRI is higher in male patients than female patients (p<0.01). Old (age≥40) patients frequently shows abnormal cervical MRI findings than young patients (p<0.001). In patients who had neurologic abnormality, the incidence of abnormality on cervical MRI is higher than neurologically normal patients (p<0.001). But, mechanisms of injuries and associated injuries are not related to the incidence of abnormality on cervical MRI. Injuries of lower cervical spine (C7) are frequently missed than those of other cervical spines (p<0.01). Conclusion: When evaluate cervical injuries in male, old, and neurologically abnormal patients, we must consider cervical MRI although the simple cervical X-ray is normal. We must pay more attention to lower cervical spine injuries than other cervical spine injuries.
소형 추력기의 성능 개선을 위한 액체 추진제 주입기 최적 설계 및 추진제 거동 연구
김기로(Kiro Kim),김수겸(Su-Kyum Kim),변도영(Do-Young Byun),이세민(Se-Min Lee),정강수(Kang-Su Jung),박수형(Soo-Hyung Park),김성균(Sung-Kyun Kim),유명종(Myoung-Jong Yu) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.4
본 연구는 기존의 인젝터와 새로운 형태의 인젝터를 비교분석 함으로써 소형 추력기의 성농을 연구하였다. 기존의 인젝터는 볼록한 표면에 8개의 노즐로 구성되어 액체 추진제를 분사하는 형태로 제작되었다. 우리가 제안한 새로운 형태의 인젝터는 오목한 표면에 4, 5, 6, 8, 9개의 노즐로 구성된 충돌형 인젝터이다. 노즐의 구멍을 통해 분사되는 액체 추진제는 축 방향으로 한 점에서 부딪히게 설계되었으며, 이는 분사되는 액체 추진체의 입자를 더욱 세분화하여 사방으로 일정하게 분무할 수 있도록 하였다. 본 논문에서는 천산유체역학, 입자 유속계 및 고속 카메라를 이용하여 분무 가시화 및 인젝터의 성능을 연구하였다. This work studies the performance of an injector for a monopropellant thruster, comparing a conventional and new injector types. The conventional injector consists of 8 nozzles on a convex surface allowing the jet to be diverged. The new injector, we suggested, is an impinging type with nozzle holes on a concave surface. The fuel streams through the nozzle holes are collide at a point on an axial direction, which allow to atomize the liquid streams and to spray more uniformly along circular direction. The performance of the injectors is investigated by using computational fluid dynamics, particle image velocimetry and high speed camera visualization.