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- 저자 : 김종언 (검색결과 92 건)
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김종언,장택수 대한조선학회 2023 大韓造船學會 論文集 Vol.60 No.5
In this paper, numerical experiments are performed to examine the collision between a solitary wave and a wave-packet (dispersive wave) in shallow water. We attempt to introduce the improved Boussinesq equation governing the experiments, which is solved by using a semi-analytical approach, called Pseudo-parameter Iteration method(PIM). Using various numerical experiments, we have observed that the wave-packet (propagating dispersive wave) experiences a phase shift after collision with a solitary wave. This phenomenon may be considered as a nonlinear wave–wave interaction in shallow water.
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김종언,이상훈 한국방사선학회 2020 한국방사선학회 논문지 Vol.14 No.3
In order to control the quality of X-ray images and patient exposure, it is necessary to document the output dose(air absorption dose(mGy)) output from the X-ray unit from the measurement. The purpose of this study is to find an equation that can calculate the output dose from the measurement of the output dose and output factor(Of) of the X-ray Unit. The output dose and output factors of the X-beam irradiated from the X-ray unit were measured using an XR multi-detector. The output dose calculation formula was obtained by fitting the measured output dose divided by the tube current-exposure time product(mAs) and the set tube voltage with Allometric1. The final output dose calculation formula was obtained by multiplying this formula with the output factor. It is considered that the obtained final output dose calculation formula will be useful for all tube voltages, tube currents, exposure times, field sizes, and distances. X-선영상의 품질과 환자의 피폭 관리를 위하여 X-선장치에서 출력되는 선량(공기 흡수선량(mGy)은 측정으로부터 자료화 하는 것이 필요하다. 이 연구의 목적은 X-선장치의 출력선량과 출력인자(Of)의 측정으로부터 출력선량을 계산할 수 있는 식을 구하는데 있다. X-선장치로부터 조사되는 X-빔의 출력선량과 출력인자는 XR멀티검출기를 사용하여 측정하였다. 결과로서, 관전류-조사시간 곱(mAs)으로 나누어진 측정된 출력선량과 설정관전압을 Allometric1 fit하여 출력선량 계산식을 얻었다. 이 식에 출력인자를 곱하여 최종 출력선량 계산식을 구하였다. 구하여진 최종 출력선량 계산식은 모든 관전압, 관전류, 조사시간, 조사야 그리고 거리에 적용하는데 유용할 것으로 사료된다.
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김종언 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.4
The purpose of this study is to determine the effective energy of CT X-ray beams by using the CT slice images of a CT number calibration insert part in the AAPM CT performance phantom. The CT number calibration insert part in the AAPM CT performance phantom was scanned five times by using a CT canner for 80, 100 and 120 kVp X-ray beams. The average value of CT numbers of each pin were measured for each CT slice image. The correlation coefficients were obtained by linear fit between the average value of CT numbers measured and liner attenuation coefficient under different energy at each pin calculated from data of NIST. A photon energy corresponding to the maximum value of the obtained correlation coefficient was determined as an effective energy. As a result, the effective energy was 56, 62 and 66~67 keV, respectively, for 80, 100 and 120 kVp X-ray beams. 이 연구의 목적은 AAPM CT 성능 팬텀 안에 있는 CT 수 교정 삽입부의 CT 슬라이스 영상들을 사용하여 CT X-선 빔들의 유효에너지를 결정하는데 있다. AAPM CT 성능 팬텀의 CT 수 교정 삽입부는 80, 100, 120 kVp X-선 빔에 대하여 CT 스캐너로 5번 스캔되었다. 각 핀의 CT 수는 각각의 CT 슬라이스 영상에 대하여 측정되었다. 상관계수들은 각 핀에서 측정된 CT 수의 평균값과 미국표준기술연구소의 자료로부터 계산된 다른 광자에너지 하에 선감약계수를 선형정합하여 얻었다. 얻어진 상관계수의 최대값에 대응하는 광자에너지는 유효에너지로 결정하였다. 결과로서, 유효에너지는 80, 100, 120 kVp X-선 빔들에 대하여 각각 56, 62, 66~67 keV이다.
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광자극형광나노닷선량계를 사용한 X선 빔의 유효에너지 결정
김종언,이상훈 한국방사선학회 2015 한국방사선학회 논문지 Vol.9 No.6
The purpose of this study is to determine the effective energy of a polyenegetic X-ray beam. The half value layer(HVL) of aluminum for 80 kVp X-ray beam was measured by using optically stimulated luminescent nanoDot dosimeters(OSLnDs). The linear attenuation coefficient(μ) was calculated using the measured HVL. And the mass attenuation coefficient(μ/ρ) was obtained by dividing the linear attenuation coefficient by the density(ρ) of aluminum. The effective energy(Eeff) of the obtained mass attenuation coefficient was determined using data of the X-ray mass attenuation coefficients for photon energies of aluminum given by National Institute of Standards and Technology(NIST). As a result, the HVL value is 2.262 ㎜Al. The μ value is 3.06 ㎝-1. The μ/ρ value is 1.114 ㎠/g. And the Eeff value was determined at 29.79 keV. 이 연구의 목적은 다종에너지 X선 빔의 유효에너지를 결정하는데 있다. 80 kVp X선 빔에 대한 알루미늄의 반가층은 광자극형광나노닷선량계들(OSLnDs)을 사용하여 측정하였다. 선감쇠계수(μ)는 측정된 반가층을 사용하여 계산하였다. 그리고 질량감쇠계수(μ/ρ)는 알루미늄의 밀도로 선감쇠계수를 나누어 얻었다. 얻어진 질량감쇠계수의 유효에너지(Eeff)는 미국표준기술연구소(NIST)에서 주어진 알루미늄의 광자에너지들에 대한 X선질량감쇠계수들의 자료를 사용하여 결정하였다. 결과로서, 반가층, 선감쇠계수 및 질량감쇠계수는 각각 2.262 ㎜Al, 3.06 ㎝-1, 1.114 ㎠/g이다. 그리고 유효에너지는 29.79 keV에서 결정되었다.
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김종언,안병수 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.20 No.1
This study examines the parts, symptoms, causes, period and treatment of injuries of man and woman pro basketball players according to their sex and injury positions in order to provide the basic information and materials for improving their athletic capacity and understanding the basic causes of the injuries with 164 man and woman Professional basketball players. It obtains the following conclusions. 1. It is found that according to the parts of injuries by exercises, injuries of the lower limbs, the upper limbs and the trunk were found frequently and according to the athletes' position, center, forward and guard showed high injuries in their lower, upper limbs and the trunk. 2. It is known that according to athletic technique in injuries, man athletes had most injuries in jumping and landing, followed by defense blocking and rebound, and female athletes had most injuries in jumping and landing, followed by ball catching and defense blocking. 3. It is found that in the injured parts, male athletes had most injuries in joint, muscle, tendon and skin in order and female athletes had most injuries in muscle, tendon, nerve and skin in order. According to athletes' position, center player had more joint, muscle and tendon, forward player had joint and nerve and guard player had muscle, tendon, nerve and joint. 4. It is understood that in the season of sport injuries, both male and female athletes had more injuries during group training and individual training in order and they had frequent injuries in winter and summer. Center, forward and guard players had more injuries during group training and in winter. 5. It is considered that the causes of injuries were mainly excessive and radical training and chronic fatigue in both male and female athletes and all their positions. 6. It is shown that according to the treatment and place of sport injury, all players had injuries in team compulsory training and they used their clinics for treating their injuries.
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