고 에너지 양성자 가속기에서 생성되는 2차 방사선의 효과적인 차폐에 관한 연구

배상일(Sang-Il Bae),김정훈(Jung-Hoon Kim) 대한방사선과학회(구 대한방사선기술학회) 2020 방사선기술과학 Vol.43 No.5

High-energy proton accelerators continue to be increasingly used in medical, research and industrial settings. However, due to the high energy of protons, a large number of secondary radiation occurs. Among them, neutrons are accompanied by difficulties of shielding due to various energy distribution and permeability. So In this study, we propose a shielding method that can shield neutrons most efficiently by using multiple-shielding material used as a decelerating agent or absorbent as well as a single concrete shielding. The flux of secondary neutrons showed a greater decrease in the flux rate when heavy concrete was used than in the case of ordinary concrete, and the maximum flux reduction was observed at the front position when using multiple shields. Multiple shielding can increase shielding efficiency more than single shielding however, As the thickness of the multiple shielding materials increased, the decline in flux was saturated. The mixture material showed higher shielding results than the polyethylene when using boron carbonate.

OpenCable 표준에 기초한 디지털 유선방송 전송 품질 분석

배상권(Bae Sang-kwen),박승권(Park Sung-kwon),이재일(Lee Jae-il),김계영(Kim Gye-young),김태균(Kim Tae-kyun),김희동(Kim Hee-dong),박선준(Park Seon-jun),장태우(Jang Tae woo),정수원(Jung Su won),정해묵(Jung Hae-muk),한상혁(Han Sang-hyeok 한국통신학회 2002 한국통신학회 학술대회논문집 Vol.2002 No.7

몬테카를로 시뮬레이션을 통한 중하전입자의 콘크리트 방사화 비교평가

배상일(Sang-Il Bae),조용인(Yong-In Cho),김정훈(Jung-Hoon Kim) 대한방사선과학회(구 대한방사선기술학회) 2021 방사선기술과학 Vol.44 No.4

A heavy particle accelerator is a device that accelerates particles using high energy and is used in various fields such as medical and industrial fields as well as research. However, secondary neutrons and particle fragments are generated by the high-energy particle beam, and among them, the neutrons do not have an electric charge and directly interact with the nucleus to cause radiation of the material. Quantitative evaluation of the radioactive material produced in this way is necessary, but there are many difficulties in actual measurement during or after operation. Therefore, this study compared and evaluated the generated radioactive material in the concrete shield for protons and carbon ions of specific energy by using the simulation code FLUKA. For the evaluation of each energy of proton beam and carbon ion, the reliability of the source term was secured within 2% of the relative error with the data of the NASA Space Radiation Laboratory(NSRL), which is an internationally standardized data. In the evaluation, carbon ions exhibited higher neutron flux than protons. Afterwards, in the evaluation of radioactive materials under actual operating conditions for disposal, a large amount of short-lived beta-decay nuclides occurred immediately after the operation was terminated, and in the case of protons with a high beam speed, more radioactive products were generated than carbon ions. At this time, radionuclides of 44Sc, 3H and 22Na were observed at a high rate. In addition, as the cooling time elapsed, the ratio of long-lived nuclides increased. For nonparticulate radionuclides, 3H, 22Na, and for particulate radionuclides, 44Ti, 55Fe, 60Co, 152Eu, and 154Eu nuclides showed a high ratio. In this study, it is judged that it is possible to use the particle accelerator as basic data for facility maintenance, repair and dismantling through the prediction of radioactive materials in concrete according to the cooling time after operation and termination of operation.

몬테칼로 시뮬레이션을 활용한 양성자가속기 단기사용 시 구성품의 방사화 평가

배상일(Sang-Il Bae),김정훈(Jung-Hoon Kim) 대한방사선과학회(구 대한방사선기술학회) 2020 방사선기술과학 Vol.43 No.5

The evaluation of radioactivated components of heavy-ion accelerator facilities affects the safety of radiation management and the exposure dose for workers. and this is an important issue when predicting the disposal cost of waste during maintenance and dismantling of accelerator facilities. In this study, the FLUKA code was used to simulate the proton treatment device nozzle and classify the radio-nuclides and total radioactivity generated by each component over a short period of time. The source term was evaluated using NIST reference beam data, and the neutron flux generated for each component was calculated using the evaluated beam data. Radioactive isotopes caused by generated neutrons were compared and evaluated using nuclide information from the International Radiation Protection Association and the Korea Radioisotope association. Most of the nuclides produced form of beta rays and electron capture, and short-lived nuclides dominated. However, In the case of 54Mn, which is a radioactive product of iron, the effect of gamma rays should be considered. In the case of tritium generated from a material with a low atomic number, it is considered that handling care should be taken due to its long half-life.

혼화재를 사용한 철근콘크리트 지하철 BOX 구조물의 내구성

배상일(Bae Sang Il),전중규(Jeon Joong Kyu),김은겸(Kim Eun Kyum),전찬기(Jeon Chan Ki) 대한토목학회 2006 대한토목학회 학술대회 Vol.2006 No.10

Calculation of Neutron Energy Distribution from the Components of Proton Therapy Accelerator Using MCNPX

배상일(Sang-Il Bae),신상화(Sang-Hwa Shin) 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.7

양성자 치료기의 Passive Scattering System 노즐을 모의모사 하여 노즐 내 각 구성품에서 발생되는 중성자를 에너지별로 평가하였다. MCNPX code를 이용하여 치료환경에 사용되는 양성자 에너지 220 MeV, 도달거리 20 cm, 6 cm 길이의 SOBP를 구현하고, 치료기 가동 시 발생하는 중성자를 각 구성품에 따라 종류별로 분류하였다. 양성자 가속기 구성품 중 산란체에서 중성자가 가장 높게 발생되었으며 양성자의 중심 선속에서부터 멀어질수록 중성자의 선속은 감소되었다. 본 연구는 양성자 가속기의 유지 보수 및 해체에 필수적인 방사화 평가를 진행하기 위한 기초자료로 활용할 수 있을 것으로 사료된다. The passive scattering system nozzle of the proton therapy accelerator was simulated to evaluate the neutrons generated by each component in each nozzle by energy. The Monte Carlo N-Particle code was used to implement spread out Bragg peak with proton energy 220 MeV, reach 20 cm, and 6 cm length used in the treatment environment. Among the proton accelerator components, neutrons were the highest in scatterers, and the neutron flux decreased as it moved away from the central flux of the proton. This study can be used as a basic data for the evaluation of the radiation necessary for the maintenance and dismantling of proton accelerators.

여고 유도선수의 주기화 근력트레이닝 적용 후 체격 및 체력의 변화

배상일 ( Sang Il Bae ),이한경 ( Han Gyeong Lee ),문준혁 ( Jun Hyuk Moon ),안한주 ( Han Ju Ahn ),장성호 ( Seong Ho Jang ) 대한무도학회 2011 대한무도학회지 Vol.13 No.3

본 연구는 여고 유도선수들의 경기력 향상을 위해 유도종목의 특성과 훈련형태를 고려하여 개발한 16주간의 주기화 근력 트레이닝 프로그램을 적용한 후 체격 및 체력의 변화를 검증하는데 그 목적이 있다. 본 연구의 대상은 연구 중 중도탈락과 부상 등의 이유로 5명을 제외한 평균연령 17.4±.96세, 평균신장 161.7±5.51cm, 평균체중 62.8±13.3kg인 여고 유도선수 총 25명을 대상으로 유도 경기력 관련 체격이나 체력의 향상 효과를 프로그램적용 전·후 즉 사전-사후 각 항목의 평균차이를 비교하고 통계적 검증은 paired t-test를 실시하였다. 주기화 근력 트레이닝 프로그램을 여고 유도선수에게 적용한 결과 사전과 사후의 체격 및 체력의 변화 검증에서 다음과 같은 결과가 도출되었다. 신체조성에서 체지방률은 변화의 패턴이 나타나지 않았으며, 최대근력(1-RM)의 측정을 위한 벤치프레스 결과를 보면 근파워의 차이에서 약 2.5kg이상 근파워가 증가한 것을 확인할 수 있었다. 또한 스쿼트의 결과에서도 통계적으로 유의한 차이가 있었으며, 약 15.4kg이 증가한 것을 확인하였다. 이러한 결과는 여고 유도선수들에게 적용한 주기화 근력 트레이닝 프로그램이 효과가 있었던 것으로 판단된다. 향후 본 연구의 주기화 근력 트레이닝 프로그램의 효과를 검증하기 위해 주기화 근력 트레이닝 프로그램을 적용하지 않은 대조군과의 비교가 필요하며, 매트훈련과 연관된 동작이나 자기 체중을 이용한 체력훈련 프로그램 등을 개발하여 근력 트레이닝과 함께 실시한다면 유도경기의 특성인 중심이동을 원활하게 할 수 있는 동적인 트레이닝을 수행할 수 있을 것이다. This research aims at applying the 16-week periodic muscular strength training program developed by taking the characteristics and training forms of judo into consideration to the field in order to enhance the athletic performance of judo players in girls` high schools and at verifying its effects. The research subjects were 25 judo players from girls` high schools, whose average age was 17.4±.96, average height 161.7±5.51cm and average weight 62.8±13.3kg, except the five players who were injured and dropped out during the research. With regard to the improvement in their physique and athletic performance relevant to judo performance, the differences in the averages of each item before and after applying the program, that is, the preliminary and post tests, were compared, and a paired t-test was conducted to examine them statistically. When the periodic muscular strength training program was applied to the judo players in girls` high schools, the following result was deducted from the tests on the differences in the physique and athletic performance before and after the application. In the body composition, no pattern of change was found in their body fat percentages, and the bench-press result to measure the maximum muscular strength (1-RM) proved that their muscular power increased by more than about 2.5kg. In addition, a statistically meaningful difference was found in the result of squats, and about 15.4kg was confirmed to have increased. These results showed that the periodic muscular strength training program applied to the judo players in girls` high schools was effective. For more effective application of the periodic muscular strength training program developed in this research, if some movements related to mat training or a strength training program where their own weight is used are developed and performed along with the muscular strength training, a dynamic training which helps judo players move cores smoothly, one of the features of judo games, will be able to be conducted.

퇴행성 관절염 환자의 연골 조직에서 콜라겐 변화에 관한 연구

배상철 ( Sang Cheol Bae ),정성수 ( Sung Soo Jung ),이인홍 ( In Hong Lee ),유대현 ( Dae Hyun Yoo ),김성윤 ( Seong Yoon Kim ),정현기 ( Hyun Kee Chung ),최일용 ( Il Yong Choi ) 대한류마티스학회 1994 대한류마티스학회지 Vol.1 No.2

목적: 퇴행성 관절염은 조직학적으로 주로 연골, 활액막, 골조직의 퇴행, 재생, 교정적 변화를 특징으로 하는 질호나으로 이러한 구조적 변화를 정확히 이해하는 것은 유병 기전을 밝히고 질환의 활동도 및 진행 정도를 평가하는데 도움이 된다. 이에 저자들은 연골의 주요 구성성분인 콜라겐의 초직학적 변화를 정확히 펴어가하기 위해 본 연구를 시행하였다. 방법: 정상 대조 연골 조직 l예, 퇴행성 .관절염 연골 조직 10예를 대상으로 ① 제1형, 제2형, 제3형 콜라겐 분포를 조사하기 위해 단일세포성 항체를 이용한 immunoperoxidase법 ② Masson`s trichrome 염색 및 ③ 편광 현미경을 이용한 Picrosirius Red 염색법을 시행하여 비교 관찰하였다 결과: 1) 제2형 콜라겐은 정상 및 퇴행성 관절염 연골 모두에서 전반적으로 말현되어 유의한 차이가 없었다. 제1형 및 제3형 콜라겐은 정상 조직에서는 발현 되지 않으나, 퇴행성 관절염 연골에서는 연골 세포 주위에 발현이 증가되었다, 2) Masson`s trichrome 염색법으로는 정상과 퇴행성 관절염 연골의 콜라겐 분포를 차이를 관찰할 수 없었다 3) Picrosirius Red 염색 후 편광 현미경으로 관찰한 경우, 정상에 비해 퇴행성 관절염 연골은 전반 적으로 복굴절성이 감소되고 불규칙하였으며, 연골 세포 주위의 복굴절성은 증가되어 있었다. 결론: 이상의 결과로, Picrosirius Red 염색법을 이용한 편광현미경 관찰법은 퇴행성 관절염 연골 조직의 콜라겐 변화를 쉽게 관찰 할 수 있는 유용한 방법으로 이용할 수 있을 것으로 사료된다. Objective: Osteoarthritis is a disorder or group of disorders affecting synovial joint, characterized at the tissue level by degenerative, regenerative and reparative structural changes in cartilage, synovium and bone. The histopathological understanding of osteoarthritis would help to clear the pathogenesis and evaluate the activity and progression of the disease. We studied the histochemical distribution of collagen in the search for and accurate morphometric marker for osteoarthritic progression. Methods: The immunohistochemical analysis by monoclonal antibodies to type I, II and III collagen, the Masson`s trichrome stain and the Picrosirius stain and polarization microscopy were performed in 10 osteoarthritis cartilages and 1 normal control cartilage. Results: 1) By the immunohistochemical analysis, type II collagen was diffusely expressed in both normal and osteoarthritis cartilage but the expression of type I and III collagen was only shown around chondrocytes in the osteoarthritis cartilage. 2) There was no difference in Masson`s trichrome stain of the normal and osteoarthritis cartilage. 3) By the Picrosirius stain and polarization microscopy, there was less diffuse birefringence of collagen and increased perichondronal birefringence in the osteoarthritis cartilage in comparison to normal cartilage. Conclusions: The Picrosirius-polarization method may be considered one of the useful morphometriic methods for the progression of osteoarthrits.

일반연제 발표 : 임상적 지표를 이용한 미세변화 신증후군의 확률 추정

배상석 ( Bae Sang Seog ),김기석 ( Kim Gi Seog ),김형삼 ( Kim Hyeong Sam ),오석진 ( O Seog Jin ),유일영 ( Yu Il Yeong ),김혜영 ( Kim Hye Yeong ),엄재호 ( Eom Jae Ho ),김헌 ( Kim Heon ) 대한신장학회 2002 춘계학술대회 초록집 Vol.21 No.1

임프란트 표면 처리에 따른 공명주파수 변화에 대한 연구

배상범,이성현,송승일,Bae, Sang-Bum,Lee, Seong-Hyun,Song, Seung-Il 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.2

Purpose: The aim of this study is to compare the stability between Mg-incorporated implant, TiUnite and Machined implant. Materials and Methods: Premolars of 3 Mini pigs (24 months) were extracted. After 2 months later, total 27 fixtures of implants (9 of each design : Machined/ TiUnite/ Mg-incorporated) were inserted into the mandible of 3 mini-pig. Implant stability was estimated by RFA in installation to 2, 4 & 6 weeks. Statistical analysis of RFA values was performed with time and between groups using repeated measure ANOVA and turkey's multiple comparison test. Results: In analyzing the mean value for the observation periods, three types of implants yielded a slight decrease in RFA mean value after 2 week, followed by increase at 4-6 weeks. Mg incorporated oxidized implants demonstrated significantly higher RFA mean values at 6 weeks comparing other groups. The difference of RFA value with time and between groups was statistically significant. Conclusion: We concluded that Mg implants may reduce failure rates of clinical implants In the early period of bone healing and Mg implants may shorten the bone healing time from surgery to functional loading.