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한센 환자의 마비성 눈꺼풀겉말림에 시행한 강화된 가쪽 눈꺼풀판띠고정술의 효과
김경현,정인영,서성욱,Kyeong Hyeon Kim,In Young Chung,Seong Wook Seo 대한안과학회 2009 대한안과학회지 Vol.50 No.4
Purpose: To analyze the effect of the augmented lateral tarsal strip for the correction of the paralytic ectropion in leprosy patients. Methods: Ten leprosy patients (16 eyelids) with exposed keratitis and lagophthalmos from paralytic ectropion underwent surgery of the augmented lateral tarsal strip. Preoperative and postoperative vertical palpebral aperture, marginal reflex distance, lagophthalmos, and anterior segment findings were recorded at 3 and 6 months after surgery. Postoperative symptomatic and functional improvements were assessed at 6 months after surgery. Results: There was a significant reduction between preoperative and postoperative measurements for vertical palpebral aperture (3.1±0.4 mm), lower marginal reflex distance (2.1±1.0 mm), and lagophthalmos (2.0±1.2 mm). Eye irritation symptoms and lid functions were improved in all patients. In a survey, the symptomatic, functional satisfaction was achieved in 90% of patients. Conclusions: The augmented lateral tarsal strip is a sufficiently effective surgical procedure to be considered in the treatment of paralytic ectropion in leprosy patients. J Korean Ophthalmol Soc 2009;50(4):497-504
김경현(Gyeong-Hyeon Kim),남현도(Hyeon-Do Nam),김경호(Kyeong-Ho Kim) 대한전기학회 2018 전기학회논문지 Vol.67 No.7
In this study, we make a study on a system to determine a person’s sitting posture by measuring the distribution of pressure in the floor of a chair or in a cushion using pressure sensors. If the wrong sitting posture is detected, a warning message is given through the vibration motor in real time to correct the imbalance of the wrong habits and posture, and prevent Bulging disc or Herniated disc.
Achromobacter Xylosoxidans에 의한 만성눈물주머니염 1예
김체론,김규남,김경현,유지명,서성욱,Che Ron Kim,Gyu Nam Kim,Kyeong Hyeon Kim,Ji Myong Yoo,Seong Wook Seo 대한안과학회 2011 대한안과학회지 Vol.52 No.8
Purpose: To report a case of chronic dacryocystitis caused by Achromobacter xylosoxidans. Case summary: A 73-year-old female was referred to our clinic for management of chronic dacryosyctitis from which she did not to recover despite empirical therapy. A. xylosoxidans was isolated from purulent discharge. Based on the results of susceptibility testing, therapy was changed to fortified ceftazidime eye-drop 6 times a day and intravenous tazocin 4.5 g/20 ml (piperacillin 2 g/tazobactam 0.25 g) 3 times a day. All symptoms were resolved after treatment with sensitive antibiotics and external dacryocystorhinostomy. Conclusions: To our knowledge, this is the first report of A. xylosoxidans dacryocystitis. A. xylosoxidans are rare but potential pathogens which cause dacryocystitis. The cultures and sensitivity test were collected and processed to detect the presence of unusual pathogens in a case with persistent infection despite conventional treatment. J Korean Ophthalmol Soc 2011;52(8):979-983
Study of Motion-induced Dose Error Caused by Irregular Tumor Motion in Helical Tomotherapy
조민석,김태호,강성희,김동수,김경현,천금성,서태석,Cho, Min-Seok,Kim, Tae-Ho,Kang, Seong-Hee,Kim, Dong-Su,Kim, Kyeong-Hyeon,Cheon, Geum Seong,Suh, Tae Suk Korean Society of Medical Physics 2015 의학물리 Vol.26 No.3
본 연구에서는 불규칙적인 종양의 움직임에서 각각의 움직임 파라미터에 의해 발생되는 토모테라피 장비의 선량 오차 특성을 분석하여, 각각의 파라미터가 선량에 미치는 효과를 확인하기 위해 간소화된 이론 모델을 적용, 시뮬레이션 분석을 수행하고자 한다. 간단한 분석적인 모델이 tumor motion parameters에 의한 motion-induced dose error를 분석하기 위해 사용되었다. 분석적인 모델은 실제 tomotherapy 장비를 이용한 static dose와 Simulated tumor motion를 이용하여 dose profile을 획득하는 것이다. 본 연구에서는 Static dose를 얻기 위해 Hi-art tomotherapy unit을 이용하였다. Simulated tumor motion은 internet accessible respiratory trace generator (RTG) program을 이용하여 획득되었다. 종양의 움직임은 불규칙한 정도가 큰 케이스와 작은 케이스, 실제 환자의 종양 움직임을 모사한 케이스로 구분하였다. 불규칙도가 작은 케이스의 경우 종양의 진폭, 주기, 베이스라인 등 종양 움직임 파라미터에 10% 변동을 인가 하였으며, 불규칙도가 큰 케이스의 경우 40%의 변동을 인가 하였다. 위상변동 케이스의 경우 종양의 초기위상이 end inhale, mid exhale, end exhale, and mid inhale으로 나뉘어 졌고, 시뮬레이션을 통해 획득된 각각의 선량분포결과가 비교되었다. 또한, 환자 케이스에서는 임상과 동일한 조건에서의 종양 움직임을 인가하여 선량 오차를 획득하였다. 종양의 움직임에 의한 선량은 시뮬레이션 과정을 통해 계산되었으며 이를 종양의 움직임이 없는 케이스와 비교하여 종양 움직임이 선량에 미치는 영향을 확인했다. 진폭, 주기, 베이스라인 등 종양 움직임 파라미터가 불규칙하게 변하는 경우, 종양이 불규칙하게 움직이는 케이스의 경우 불규칙도가 큰 케이스의 경우가 불규칙도가 작은 케이스와 규칙적으로 움직이는 케이스보다 더 큰 선량오차가 발생하였다. 상쇄 효과는 종양움직임의 불규칙성에 반비례하기 때문에, 종양 움직임의 불규칙성이 큰 케이스의 경우 불규칙성이 작은 케이스, 종양의 움직임이 규칙적인 케이스에 비해 더 적은 상쇄 효과가 발생하였다. 위상변동 케이스의 경우, 불규칙한 종양의 움직임 케이스에서 규칙적인 움직임 케이스보다 더 큰 선량 차이가 관찰되었고, 또한 환자케이스에서 규칙적인 종양의 움직임의 경우보다 더 큰 선량의 차이가 발견되었다. 본 연구에서는 불규칙적인 종양의 움직임에서 각각의 움직임 변수들의 불규칙성에 따른 발생되는 토모테라피에서의 선량 오차 특성을 분석하였다. 본 연구의 결과를 통해 불균일한 종양 움직임의 불규칙성을 제어하는 것에 대한 중요성을 확인할 수 있었고, 이러한 불균일성의 제어의 경우 복부압박이나 호흡 훈련을 통해 해결이 가능할 것으로 생각된다. The purpose of this study is to analyze motion-induced dose error generated by each tumor motion parameters of irregular tumor motion in helical tomotherapy. To understand the effect of the irregular tumor motion, a simple analytical model was simulated. Moving cases that has tumor motion were divided into a slightly irregular tumor motion case, a large irregular tumor motion case and a patient case. The slightly irregular tumor motion case was simulated with a variability of 10% in the tumor motion parameters of amplitude (amplitude case), period (period case), and baseline (baseline case), while the large irregular tumor motion case was simulated with a variability of 40%. In the phase case, the initial phase of the tumor motion was divided into end inhale, mid exhale, end exhale, and mid inhale; the simulated dose profiles for each case were compared. The patient case was also investigated to verify the motion-induced dose error in 'clinical-like' conditions. According to the simulation process, the dose profile was calculated. The moving case was compared with the static case that has no tumor motion. In the amplitude, period, baseline cases, the results show that the motion-induced dose error in the large irregular tumor motion case was larger than that in the slightly irregular tumor motion case or regular tumor motion case. Because the offset effect was inversely proportion to irregularity of tumor motion, offset effect was smaller in the large irregular tumor motion case than the slightly irregular tumor motion case or regular tumor motion case. In the phase case, the larger dose discrepancy was observed in the irregular tumor motion case than regular tumor motion case. A larger motion-induced dose error was also observed in the patient case than in the regular tumor motion case. This study analyzed motion-induced dose error as a function of each tumor motion parameters of irregular tumor motion during helical tomotherapy. The analysis showed that variability control of irregular tumor motion is important. We believe that the variability of irregular tumor motion can be reduced by using abdominal compression and respiratory training.
VitalBeam 선형가속기의 심부선량백분율과 측방선량분포 측정을 위한 새로운 기준 전리함으로서 스텔스 전리함의 성능 평가
김연래(Yon-Lae Kim),정진범(Jin-Beom Chung),강성희(Seong-Hee Kang),강상원(Sang-Won Kang),김경현(Kyeong-Hyeon Kim),정재용(Jae-Yong Jung)신영주(Young-Joo Shin),서태석(Tae-Suk Suh),이정우(Jeong-Woo Lee) 대한방사선과학회(구 대한방사선기술학회) 2018 방사선기술과학 Vol.41 No.3
Abstract The purpose of this study is to evaluate the performance of a “stealth chamber” as a novel reference chamber for measuring percentage depth dose (PDD) and profile of 6, 8 and 10 MV photon energies. The PDD curves and dose profiles with fields ranging from 3 × 3 to 25 × 25 cm 2 were acquired from measurements by using the stealth chamber and CC 13 chamber as reference chamber. All measurements were performed with Varian VitalBeam linear accelerator. In order to assess the performance of stealth chamber, PDD curves and profiles measured with stealth chamber were compared with measurement data using CC13 chamber. For PPDs measured with both chambers, the dosimetric parameters such as d max (depth of maximum dose), D 50 (PDD at 50 ㎜ depth), and D 100 (PDD at 100 ㎜ depth) were analyzed. Moreover, root mean square error (RMSE) values for profiles at d max and 100 ㎜ depth were evaluated. The measured PDDs and profiles between the stealth chamber and CC13 chamber as reference detector had almost comparable. For PDDs, the evaluated dosimetric parameters were observed small difference (<1%) for all energies and field sizes, except for d max less than 2 ㎜. In addition, the difference of RMSEs for profiles at d max and 100 ㎜ depth was similar for both chambers. This study confirmed that the use of stealth chamber for measuring commission beam data is a feasible as reference chamber for fields ranging from 3 × 3 to 20 × 20 cm 2 . Furthermore, it has an advantage with respect to measurement of the small fields (less than 3 × 3 cm 2 field) although not performed in this study.
FFS 모드의 공통전극과 화소전극 사이의 절연층 두께에 따른 전기광학 특성
정준호,하경수,임영진,유일수,정연학,유재진,김경현,이승희,Jung, Jun-Ho,Ha, Kyung-Su,Lim, Young-Jin,Yoo, Il-Sou,Jeong, Yeon-Hak,Lyu, Jae-Jin,Kim, Kyeong-Hyeon,Lee, Seung-Hee 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.7
We have studied electro-optic characteristics as a function of passivation thickness existing between common electrode and pixel electrodes in the fringe-field switching (FFS) mode using the LC with positive dielectric anisotropy. A steep increase in the transmission is observed with increase in the passivation layer from $0.29{\mu}m$ to $1.09{\mu}m$ and thereafter it almost saturates over the $1.09{\mu}m$ of passivation layer. This saturation is mainly associated with correlation between transmittance at the center region of pixel electrode and at the center region between pixel electrodes. From the results, optimal thickness of passivation layer can be defined.