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광섬유 집합체 센서를 이용한 6MV 광자선의 반음영 및 심부선량백분율 측정
신상훈,장경원,조동현,유욱재,서정기,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, a fiber-optic bundle sensor has been developed using water-equivalent organic scintillating fibers for photon beam measurement. Beam penumbra and percent depth doses(PDD) are measured according to the depth of the photon beam. This sensor has many advantages such as high resolution, real-time measurement and ease of calibration over conventional radiation measurement devices.
연속파형 Nd:YAG SM45C 레이저 용접의 결함 감소연구
유영태,오용석,노경보,신호준 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.1
본 연구에서는 Nd:YAG 연속파형 레이저를 이용하여 레이저 용접시 레이저빔의 출력에 대한 레이저범의 이송속도를 변화시켜 심입용접을 실시했다. 열처리를 하지 않고 용접을 실시했을 경우 매우 조대한 기공이 많이 발생하였지만 열처리 후 용접을 실시했을 때는 몇몇 미세한 기공만 발생하였다. Present investigation reports on the effect of incorporating pre-heating on the mechanical properties of laser weldi'ng joints. The Nd:YAG laser in combination with the optical fiber increase the automation and the flexibility of a whole industry. The Nd:YAG laser welding process is one of the most advenced menufacturing technologies owing to its high sped and penetration. This paper describes the weldability of Sh4456 carbon steel fox machine structural use by Nd:YAG laser. Optical microscopy SEM were performed to observe the micro structures and to determine the structures of welded zone. In addtion, mechanical propreties, were measured by tensile test to evaluate the formablity of the welded specimen. The results show that proper selection of the control parameters for per-heating technique can result the porosity and cracking of the welding significantly, and improve the welded joints mechanical properties, such as higher tensile strength and better durability.
신경화,채경연,유양자 한국조리과학회 2002 한국식품조리과학회지 Vol.18 No.1
This study was intended to investigate the breakfast habits of salaried people. Total 446 subjects (male:256 and female:190) living in Seoul participated in the study. The results obtained were as follows : About 88.8% of the respondents perceived well the importance of breakfast, but only 33.2% of them responded to have breakfast every morning. It was found that males, older people, married people and people with higher education had a tendency to have breakfast regularly. The main reasons for having breakfast were ’for nutritional intake ’(42.2%) and ’for relieving hunger’(31.3%). Cooked rice with soup (78.4%) was the most popular menu for breakfast. The time for breakfast was about 5∼15 minutes. The reasons for skipping breakfast were ’the lack of time > low appetite > habitually’, but 59.6% of the respondents answered to have cooked rice with soup if they would. The 95.6% of the respondents showed more than the ’moderate’score on nutritional knowledge. Female salaried people showed higher scores on nutritional knowledge than male counterparts. People with higher education had a better nutritional knowledge. It was found that male, older people, people with higher education, and members in the extended family or nuclear family had good eating habits. Nutritial knowledge showed a significant positive relationship with eating habits. Overall, salaried people perceived the importance of breakfast, but had poor dietary habit of skipping breakfast at 23.3%. Therefore, convenient and nutritional substitute for breakfast should be developed for salaried people.
치료용 방사선의 입사각에 따른 광섬유 방사선량계의 체렌코프 빛 측정 및 분석
장경원,조동현,유욱재,신상훈,서정기,이봉수,박병기,문주현 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, we have measured scintillating light generated in a fiber-optic dosimeter by high energy photon and electron beams using a charge-coupled device. The intensity of Cerenkov lights are also measured and characterized as functions of incident angles and energies of the high energy beams from a clinical linear accelerator. To minimize or remove Cerenkov light, a simple subtraction method using a background optical fiber and wavelength discrimination method using optical filters are investigated. Also, the intensities of Cerenkov light induced by high energy photon and electron beams are compared.
방사성 페기물 처리장의 지하수 온도 측정을 위한 광섬유 센서의 제작 및 특성 분석
서정기,유욱재,장경원,조동현,신상훈,이봉수 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
Fiber-optic temperature sensing technology can alternative to classical measurement techniques in nuclear environment, Its advantages allow low cost, a long distance measurement and real-time, In this study, we have measured the optical power of power meter and the output voltage of photodiode according to change temperature of water.
광섬유 방사선 센서와 EBT 필름을 이용한 심부선량 백분율 측정 및 비교
조동현,장경원,유욱재,신상훈,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, fiber-optic sensor is fabricated to measure PDD of CLINAC. As a scintillating light generated by a high energy X-ray from the medical LINAC is measured using photo diode amp system, It is expected that a high-resolution, real-time fiber-optic dosimeter for medical LINAC can be developed.
Optical Imaging Technology for Real-time Tumor Monitoring
Yoo-kyoung Shin,엄주범 대한의학레이저학회 2021 MEDICAL LASERS Vol.10 No.3
Optical imaging modalities with properties of real-time, non-invasive, in vivo, and high resolution for image-guided surgery have been widely studied. In this review, we introduce two optical imaging systems, that could be the core of image-guided surgery and introduce the system configuration, implementation, and operation methods. First, we introduce the optical coherence tomography (OCT) system implemented by our research group. This system is implemented based on a sweptsource, and the system has an axial resolution of 11 μm and a lateral resolution of 22 μm. Second, we introduce a fluorescence imaging system. The fluorescence imaging system was implemented based on the absorption and fluorescence wavelength of indocyanine green (ICG), with a light-emitting diode (LED) light source. To confirm the performance of the two imaging systems, human malignant melanoma cells were injected into BALB/c nude mice to create a xenograft model and using this, OCT images of cancer and pathological slide images were compared. In addition, in a mouse model, an intravenous injection of indocyanine green was used with a fluorescence imaging system to detect real-time images moving along blood vessels and to detect sentinel lymph nodes, which could be very important for cancer staging. Finally, polarization-sensitive OCT to find the boundaries of cancer in real-time and real-time image-guided surgery using a developed contrast agent and fluorescence imaging system were introduced.