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고인경 ( Inkyung Koh ),조희경 ( Heekyung Cho ),현영옥 ( Youngok Hyun ),이숙기 ( Sookki Lee ),윤병천 ( Byeongcheon Yoon ) 대구대학교 한국특수교육문제연구소 2016 특수교육저널 : 이론과 실천 Vol.17 No.3
This study analyzed the antonym of Korean Sign Language(KSL). All KSL words from KSL Dictionary were 12,547, where 589 antonym pairs were found. The result of the morphological analysis, peer-to-peer morpheme was used the most. KSL antonym pairs have 6 different types of concepts such as contradiction, opposite, phased, relative, correlative and inverse relation. KSL antonym pairs from this research, 5 kinds of characteristics were found, such as separately, reversibility, symmetry, shake off and negative morpheme. Last, more research is recommended to find more antonym pairs in actual KSL words of Korean Deaf people within the words in KSL dictionary.
45 MeV 양성자 빔을 이용한 중합체 겔 선량계의 특성 평가
봉지혜,김금배,양태건,고인옥,박지애,김경민,정해조,지영훈,권수일 한국물리학회 2012 새물리 Vol.62 No.1
A normoxic polymer gel dosimeter was developed to measure the dosimetric characteristics of a 45 MeV proton beam. The gel dosimeter was synthesized using gelatin, methacrylic acid (MAA),hydroquinon (HQ), tetrakis (THPC) and Distilled water (HPLC) and was poured into an ABS container. The 45 MeV proton beam of the MC-50cyclotron accelerator was used for testing the gel dosimeter, and using a collimator, we exposed the gel dosimeter at a diameter of 12mm and a beam current of 2 nA. For the comparison with the gel dosimeter, 50 films of EBT2 were seriated and exposed to 5 nA for 5sec. The relaxation rate (R2) of the gel dosimeter exposed to the beam was obtained using 3.0T MRI and its dose was analyzed. In the dosimetric range of 0 ~ 15.5 Gy, the correlation coefficient was analyzed. The bragg peak of the proton beam based on the dosimetric changes in the 3.9 ~ 5.3 Gy dosimetric range was found at WED 12.39 mm. The possibility for using the gel dosimeter with films for the dosimetric measurement of a proton beam was confirmed. 정상산소 중합체 겔 선량계를 제작하여 45 MeV 양성자 빔에 대한 선량특성을 측정하였다. 겔 선량계는 젤라틴(Gelatin), 메타크릴산(MAA),히드로퀴논(HQ), 테트라키스(THPC), 증류수(HPLC)를 이용하여 합성하고ABS용기에 넣었다. 겔 선량계는 MC-50 사이클로트론 가속기의 45 MeV 양성자 빔을 사용하였으며 콜리메이터를 이용하여 지름 12 mm, 빔전류 2nA 로 조사하였다. 겔 선량계와의 비교를 위해서 GafchromiⓇ 필름 50장을 연속 배열하여 5 nA로 5 초 동안 조사시켰다. 빔이 조사된겔 선량계는 3.0 T MRI를 이용하여 횡이완률 R2 값을 얻어 선량을분석하였다. 0 ~ 15.5 Gy 선량범위에서 선형상관계수를 구하였다. 3.9 ~ 5.3 Gy 선량 영역에서 선량변화에 따른 양성자 빔의 브래그피이크는 WED 12.39 mm 에서 나타났다. 양성자 빔의 선량 측정에 겔선량계가 필름과 함께 선량분포를 확인하는데 유용하게 사용될 수 있는가능성을 확인하였다.
Feasibility of CBCT Dosimetry for IMRT Using a Normoxic Polymethacrylic-acid Gel Dosimeter
봉지혜,권수일,김금배,김미숙,정해조,지영훈,고인옥,박지애,김경민 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.5
The purpose of this study is to evaluate the availability of cone-beam computed tomography(CBCT) for gel dosimetry. The absorbed dose was analyzed by using intensity-modulated radiation therapy(IMRT) to irradiate several tumor shapes with a calculated dose and several tumor acquiring images with CBCT in order to verify the possibility of reading a dose on the polymer gel dosimeter by means of the CBCT image. The results were compared with those obtained using magnetic resonance imaging(MRI) and CT. The linear correlation coefficients at doses less than 10Gy for the polymer gel dosimeter were 0.967, 0.933 and 0.985 for MRI, CT and CBCT, respectively. The dose profile was symmetric on the basis of the vertical axis in a circular shape, and the uniformity was 2.50% for the MRI and 8.73% for both the CT and the CBCT. In addition, the gradient in the MR image of the gel dosimeter irradiated in an H shape was 109.88 while the gradients of the CT and the CBCT were 71.95 and 14.62, respectively. Based on better image quality, the present study showed that CBCT dosimetry for IMRT could be restrictively performed using a normoxic polymethacrylic-acid gel dosimeter.
이인기,나해리,변병현,임일한,김병일,최창운,고인옥,이교철,김경민,박수연,김유경,이준영,부선희,김정화,길희섭,박찬수,지대윤,하정호,임상무 대한신경과학회 2020 Journal of Clinical Neurology Vol.16 No.1
Background and Purpose The aim of this study was to determine the diagnostic performance and safety of a new 18F-labeled amyloid tracer, 18F-FC119S. Methods This study prospectively recruited 105 participants, comprising 53 with Alzheimer’s disease (AD) patients, 16 patients with dementia other than AD (non-AD), and 36 healthy controls (HCs). In the first screening visit, the Seoul Neuropsychological Screening Battery cognitive function test was given to the dementia group, while HC subjects completed the Korean version of the Mini Mental State Examination. Individuals underwent 18F-FC119S PET, 18F-fluorodeoxyglucose (FDG) PET, and brain MRI. The diagnostic performance of 18F-FC119S PET for AD was compared to a historical control (comprising previously reported and currently used amyloid-beta PET agents), 18F-FDG PET, and MRI. The standardized uptake value (SUV) ratio (ratio of the cerebral cortical SUV to the cerebellar SUV) was measured for each PET data set to provide semiquantitative analysis. All adverse effects during the clinical trial periods were monitored. Results Visual assessments of the 18F-FC119S PET data revealed a sensitivity of 92% and a specificity of 84% in detecting AD. 18F-FC119S PET demonstrated equivalent or better diagnostic performance for AD detection than the historical control, 18F-FDG PET (sensitivity of 80.0% and specificity of 76.0%), and MRI (sensitivity of 98.0% and specificity of 50.0%). The SUV ratios differed significantly between AD patients and the other groups, at 1.44±0.17 (mean±SD) for AD, 1.24±0.09 for non-AD, and 1.21±0.08 for HC. No clinically significant adverse effects occurred during the trial periods. Conclusions 18F-FC119S PET provides high sensitivity and specificity in detecting AD and therefore may be considered a useful diagnostic tool for AD.
Fabrication of a Normoxic Polymer Gel Dosimeter and its Dose Distribution Characteristics
조유라,권수일,박형욱,김애란,박채희,봉지혜,이재춘,조광환,이상훈,조삼주,고인옥,박지애,김경민,김금배,신상훈,정해조,지영훈 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.1
This study evaluated the performance of tissue equivalent polymer gel dosimetry as a tool for 3-dimensional dose quality assurance to using Magnetic Resonance Imaging (MRI) measure the dose characteristics of therapeutic radiation using and applying it to intensity modulated radiation therapy (IMRT). The polymer gel under normoxic conditions was synthesized using Gelatin, methyacrylic acid (MAA), hydroquinone (HQ) and tetrakis hydroxymethyl phosphonium chloride (THPC), and a polymer gel dosimeter was fabricated by placing the gel into each phantom appropriate for experimental use. The dose reaction experiment employed ^(60)Co gamma-rays and a 6-MV photon beam with a dose range of 0 ∼ 14 Gy. The dose characteristics of the polymer gel were compared with those of an ion chamber, Gafchromic EBT2 film, by using MRI. The linear correlations coefficient for the polymer gel, the ion chamber and the film were r^2 = 0.970, r^2 = 0.999, and r^2 = 0.972, respectively. The percentage depth doses at a depth of 50 mm were 85.8% and 84.6% for the polymer gel and the ion chamber, respectively, giving a difference of 1.2%. On the other hand, the percentage depth dose at the depth of 100 mm was 66.2% and 63.7% for the polymer gel and the ion chamber, respectively, indicating a 2.5% gap. The flatness and the symmetry of the gel dosimeter on the cross plane were 3.80% and 3.58%, respectively. The gel dosimeter was applied to an IMRT. The doses measured in the 100% dose domain of the therapeutic plan was 96.2%, 103.0%, and 100% for the axial, sagittal and coronal planes, respectively, highlighting the applicability of the gel dosimeter as a 3-dimensional dosimeter.