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폴리비닐알콜/폴리아크릴로니트릴 블렌드 필름의 제조 및 특성
김대섭,홍유경,김준호,Kim, Dae-Sup,Hong, Yu-Kyoung,Kim, Joon-Ho 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.1
A poly(vinyl alcohol)(PVA)/poly(acrylonitrile)(PAN) blend film was prepared and its properties were characterized to investigate the possibility of improving PVA as a reinforcing materials. From the wide-angle X-ray diffraction patterns of the blend films it can be seen that the diffraction peaks from each polymer's crystal were not changed by blending, this implies there is no mutual influence in crystallization. The water contact angle of the blend film increased with increasing PAN content. The decrease rate of the water contact angle of the blend film with time was smaller than the rate for pure PVA film. The melting temperatures of the PVA/PAN blend film only at the ratios of 99/1 and 97/3 were higher than that of pure PVA film. The thermal decomposition temperature and residual weight of the blend films were increased with increasing PAN content, indicating improved thermal stability after blending with PAN. The tensile strength and Young's modulus of the film increased after blending and the PVA/PAN blend film containing 3wt% of PAN showed the best mechanical properties.
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향상된 동적쐐기인자(Enhanced Dynamic Wedge Factor)의 특성 및 적용에 관한 고찰
김대섭,반태준,염미숙,유순미,이우석,백금문,권경태,Kim, Dae-Sup,Ban, Tae-Joon,Yeom, Mi-Suk,Yoo, Soon-Mi,Lee, Woo-Seok,Back, Geum-Mun,Kwon, Kyung-Tae 대한방사선치료학회 2010 대한방사선치료학회지 Vol.22 No.1
Purpose: We try to calculate EDW-factor easily with the formula applies essential data of EDW-factor and evaluate the validity through a measurement. Materials and Methods: We used the given value of GSTT (Golden Segmented Treatment Table) for the calculation of the EDW-factor. As to the experimental device, 0.6 cc farmer-type ion-chamber, an electrometer and water- phantom were used. A measurement was made at the maximum dose depth of the photon beam energy 6 MV and 15 MV under the condition that SSD (Source to Surface Distance) was 100 cm. The angle of the EDW (Enhanced Dynamic Wedge) which we use in an experiment was 60 degree, 30 degree, 20 degree in the Y1-OUT direction. We used Eclipse planning system (Varian, USA) as RTP system and the EDW-factor was calculated about all fields and EDW direction. In order to show the EDW-factor feature, a measurement was made at the selected field that verify the influence of the dependability about X, Y jaw and off-axis field. Results: When we change the Y1 field, it influence on the EDW-Factor and measured value. But the error between measured values and calculated values was less than 1%. The experimental result indicated the tendency that the error of the result of calculation and measured value becomes smaller as the EDW angle become smaller whether the calculation point (measurement point) and iso-center are same or not. The influence of the field size and energy did not show up. We simulated with the same condition using the RTP system. And we found that it makes no difference between the MU which is calculated manually by applying the EDW-Factor obtained from the commercial program and the value which is calculated by using RTP system. Conclusion: We excluded fitting value from well-known EDW-Factor formula and calculated EDW-factor with the formula applies essential data of EDW-factor only. As a result, there are no significant difference between the measured value and calculated value and it showed errors less than 1%. Also, we implemented the commercial program to calculate EDW-Factor conveniently without measure a factor on each field.
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방사선치료 장치 및 관련시설에서의 산란 중성자에 관한 연구
김대섭,김정만,이희석,임라승,김유현,Kim Dae-Sup,Kim Jeong-Man,Lee Hee-Seok,Lim Ra-Seung,Kim You-Hyun 대한방사선치료학회 2005 대한방사선치료학회지 Vol.17 No.2
Purpose : It is known that the neutron is generally generated from the photon, its energy is larger than 10 MV. The neutron is leaked in the container inspection system installed at the customs though its energy is below 9 MV. It is needed that the spacial effect of the neutrons released from radiation treatment machine, linac, installed in the medical canter. Materials and Methods : The medical linear accelerator(Clinac 1800, varian, USA) was used in the experiment. Measuring neutron was used bubble detector(Bubble detector, BDPND type, BTI, Canada) which was created bubble by neutron. The bubble detector is located on the medical linear accelerator outskirt in three different distance, 30, 50, 120 cm and upper, lower four point from the iso-center. In addition, for effect on protect material we have measured eight points which are 50 cm distance from iso-center. The SAD(source-axis-distance), distance from photon source to iso-center, is adjusted to 100 cm and the field size is adjusted to $15{\times}15cm^2$. Irradiate 20 MU and calculate the dose rate in mrem/MU by measuring the number of bubble. Results : The neutron is more detected at 5 position in 30, 50 cm, 7 position in 120 cm and with wedge, and 2 position without mount. Conclusion : Though detection position is laid in the same distance in neutron measurement, the different value is shown in measuring results. Also, neutron dose is affected by the additional structure, the different value is obtained in each measurement positions. So, it is needed to measure and evaluate the neutron dose in the whole space considering the effect of the distance, angular distribution and additional structure.
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김대섭,김나혜,김주영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
비소 (Arsenic; As)는 최근 큰 관심을 모으고 있는 오염물질로 미량이 물속에 존재하여도 인체에 매우 치명적인 것으로 알려져 있다. 비소는 물속에서 Arsenite (AsO<sub>3</sub><sup>3-</sup>)나 Arsenate (AsO<sub>4</sub><sup>3-</sup>)의 형태로 존재하며 이를 제거하는 목적으로 주로 사용되는 흡착물질은 산화철, 이산화티탄이나 산화제2구리와 같은 금속 산화물로, 음이온 형태의 Arsenite (AsO<sub>3</sub><sup>3-</sup>)나 Arsenate (AsO<sub>4</sub><sup>3-</sup>)와 금속산화물과의 정전기적인 인력을 이용하여서 흡착하는 형태이다. 따라서 본 연구에서는 물속에서 안정적인 나노 입자 형태로 존재할 수 있는 새로운 형태의 Magnetite/polymer Composite Nanoparticles을 Nanoprecipitation process를 사용하여 제조하였고, 비소 (As) 제거능을 확인하였다.
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