• 유통과학연구
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• 제18권9호
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• pp.67-75
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• 2020

Purpose: The purpose of this study is to enhance sales promotion efficiency for using solid refuse fuel facilities. Renewable energy technology using Solid Refuse Fuel (SRF) is an economic efficiency technology that recovers waste by burning various wastes. A survey on the pollutants discharged from the solid fuels facilities was investigated so that the SRF facilities could be expanded, distributed and reflected in the policy. Research design, data, and methodology: In this study, 9 business sites using SRF and Bio-SRF as main raw materials were investigated for 2 years. The characteristics of target business sites such as the type of fuel used, combustion method, combustion temperature, daily fuel consumption and environmental prevention facilities were studied. Results: The average pollution & ammonia concentration of Bio-SRF facilities was found to be 88.15% higher than that of SRF facilities. But the average acetaldehyde concentration of SRF facilities was found to be 88.15% higher than that of Bio-SRF facilities. Conclusions: The main issue is how much electric power generation using combustible materials affects air pollution. The waste recycling law provides the standard value according to the fuel property, but there is a considerable gap with the mixed fuel. Therefore, for efficient utilization of facilities using solid fuel products, additional research is needed to improve the distribution structure of exhaust pollutants is needed.

• 한국추진공학회지
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• 제26권4호
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• pp.44-53
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• 2022

추력조절이 가능한 고체추진기관에서 감압률은 추력중단 성능에 가장 큰 영향을 미치는 인자이다. 본 연구에서는 몇 종류의 추진기관에서 구현 가능한 감압률의 범위를 파악하였으며 이를 통하여 추진기관 감압률에 미치는 주요 인자를 도출하였다. 추진제에 대한 소화특성 파악뿐만 아니라 추진기관의 목표성능을 만족할 수 있는 감압률을 파악하는 것이 실제 추력조절 시스템 설계에 중요하며 본 연구에서와 같은 감압률 모델획득 방법론은 추력중단이 필요한 고체추진기관 설계에 적용 가능할 것으로 판단된다.

• Current Optics and Photonics
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• 제7권6호
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• pp.714-720
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• 2023

Laser cleaning has the advantages of environmental protection, precision, and high efficiency, and has good prospects for application in removing oxide films on the surface of aluminum alloy. This paper discusses the cleaning threshold and cleaning mechanism of aluminum alloy surface oxide film. A nanosecond pulsed laser was used to remove a 5-㎛-thick oxide film from the surface of 7A04 aluminum alloy, and the target surface temperature and cleaning depth were simulated. The effects of different laser energy densities on the surface morphology of the aluminum alloy were analyzed, and the plasma motion process was recorded using a high-speed camera. The temperature measurement results of the experiment are close to the simulation results. The results show that the laser cleaning of aluminum alloy oxide film is mainly based on the vaporization mechanism and the shock wave generated by the explosion.

• 대한방사선치료학회지
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• 제25권2호
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• pp.137-143
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• 2013

목 적: 불균질부를 포함하고 있는 치료부위의 치료계획 시 불균질 경계면에서의 TPS상 선량분포와 phantom을 이용하여 측정된 실제 선량분포를 비교하여 그 차이를 알아보고자 한다. 대상 및 방법: 4 cm 두께의 solid water phantom 사이에 폐와 유사한 밀도를 가진 8 cm 두께의 cork (density: 0.23 $g/cm^2$)를 위치시켜 phantom을 제작하여 CT 영상을 획득하였으며, 본원에서 사용하고 있는 Pinnacle 치료계획 시스템의 Collapsed-cone(CC) convolution 선량계산 알고리즘을 이용하여 6/15 MV 광자선으로 치료 계획된 선량분포와 실제 phantom에 EBT2 필름을 삽입해 측정한 선량을 비교 평가하였다. 또한 실제 폐암 환자와 유사한 치료계획을 비교하기 위해 Phantom 내부에 치료하고자 하는 종양부위(target volume)로 가정한 파라핀($3{\times}3{\times}3$ cm)을 Location "A" (일반조직과 떨어져있는 가상의 종양: 섬모델)와 Location "B" (일반조직과 붙어있는 가상의 종양: 반도모델)에 삽입하여 CT scan 후 치료계획을 시행하였다. 선량계획과 동일한 조건으로 Phantom을 set-up 후 Phantom의 paraffin target volume 경계면 A (Ant방향), B (Rt방향), C (Post 방향) point에 필름을 삽입하고 방사선을 조사하여 측정된 선량을 TPS선량과 비교평가 하였다. 결 과: 불균질 phantom을 이용한 계획선량과 측정선량과의 차이는 solid water와 cork 경계면을 제외한 부분에서 선량차이가 크지 않았지만 밀도가 급격히 변화하는 첫 번째 구간과 두 번째 구간에서 -5.4%~-12.6%의 선량감소를 보였다. 또한 paraffin target을 삽입한 실험에서는 Location "A"의 경우 실제 측정선량이 A, B, C point에서 각각 -2.5~-4.7%, -2.3~-2.8%, -4.5~-8.8%의 낮은 선량을 나타냈으며, Location "B"의 경우에도 A, B, C point에서 각각 0.08~5.27%, -3.17~-4.74%, -7.86~-11.56%의 선량 차이를 나타내었다. 결 론: 이번 연구의 결과 불균질부 내에서의 치료계획 시스템의 계획된 선량과 실제 측정된 선량에 오차의 가능성이 확인되었다. 급속도로 발전하고 있는 방사선 치료기술과 그만큼 정밀함을 요하는 치료계획 시 이러한 가능성에 대해 인지하고 선량검증에 대한 여러 방법들을 연구하고 개발하는 것이 치료의 발전과 필수적으로 동반되어야 할 것이며 본원에서도 이번 연구를 통해 치료계획 시 발생할 수 있는 변수에 대해서 더 주의 깊게 판단하고 적용할 수 있을 것으로 사료된다.

• Bulletin of the Korean Chemical Society
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• 제27권4호
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• pp.484-488
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• 2006

The solid-phase synthesis of new series of 1,6,8-trisubstituted tetrahydro-2H-pyrazino[1,2-a]pyrimidine-4,7-diones as bicyclic $\beta$-turn mimetics is described. Their NF-kB inhibition activities were tested and the effect of substituents on bicyclic ring was investigated. Among the prepared compounds, the fluorobenzyl and methoxybenzyl group substituted compounds 26 and 27 at C-1 and C-8 position showed more inhibitory activities than the others. Tested at a concentration of 10 uM, these two compounds showed a 60% inhibition against the target NF kB 549.

• 한국전기전자재료학회논문지
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• 제19권5호
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• pp.492-497
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• 2006

The study on laser-ablation plasmas has been strongly interested in fundamental aspects of laser-solid interaction and consequent plasma generation. In particular, this plasma has been widely used for the deposition of thin solid films and applied to the semiconductors and insulators. In this paper, we developed and discussed the generation of carbon ablation plasmas emitted by laser radiation on a solid target, graphite. The progress of carbon plasmas by laser-ablation was simulated using Monte-Carlo particle model under the pressures of vacuum, 1 Pa, 10 Pa and 66 Pa. At the results, carbon particles with low energy were deposited on the substrate as the pressure becomes higher However, there was no difference of deposition distributions of carbon particles on the substrate regardless of the pressure.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2004년도 동계학술연구발표회 논문개요집
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• pp.239-240
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• 2004

• 한국진공학회:학술대회논문집
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• 한국진공학회 2006년도 제31회 학술논문발표회 초록집
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• pp.115-115
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• 2006

• 한국전기전자재료학회논문지
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• 제17권12호
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• pp.1347-1351
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• 2004

The ZnGa$_2$O$_4$ phosphor target was synthesized through solid-state reactions as calcine and sintering temperature in order to deposit ZnGa$_2$O$_4$ Phosphor thin film by rf magnetron sputtering system. The x-ray diffraction patterns of ZnGa$_2$O$_4$ phosphor target showed the position of (311) main peak. The cathodoluminescence(CL) spectrums of ZnGa$_2$O$_4$ phosphor target showed main peak of 370 nm to 400 nm, and maximum intensity at the calcine temperature of $700^{\circ}C$ and sintering temperature of 130$0^{\circ}C$. It was possible to prepare The ZnGa$_2$O$_4$ phosphor thin film with synthesized ZnGa$_2$O$_4$ phosphor target and The prepared ZnGa$_2$O$_4$ phosphor thin film showed the position of (311) main peak.

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 제12회 정기총회 및 01년도 동계학술발표회
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• pp.98-102
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• 2001

Effects of laser polarization were studied on behaviors of fast electrons produced from an aluminum target irradiated by a solid target irradiated by obliquely incident laser pulses at Bx10$\^$15/ W/cm$^2$. Jet emission of outgoing fast electrons collimated in the polarization direction was observed for the s-polarized laser irradiation, whereas for the p-polarized irradiation, very directional emission of outgoing fast electrons was found close to the normal direction of the target. The behaviors of in-going fast electrons into the target for s- and p-polarized irradiation were also investigated by observing x-ray Bremsstrahlung radiation at the backside of the target.