• 한국연소학회:학술대회논문집
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• 한국연소학회 2006년도 제32회 KOSCO SYMPOSIUM 논문집
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• pp.13-18
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• 2006

Radiant burners are applicable to drying, preheating and curing in materials manufacturing processes. High radiation efficiency is one of the most important performance criteria for these burners. The wide variation in reported radiation efficiencies are partly due to the differences in the measurement techniques. In the present work, water cooled radiant heat flux meter was used to measure radiant heat flux from a metal fiber mat burner. Non-contact type thermometer was also utilized to measure the surface temperature of the burner. Combustion gas was measured by gas analyzers. According to the thermal loads and stoichiometric ratios, radiant heat transfer ratio and combustion performance were discussed here in.

• 한국연소학회지
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• 제11권1호
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• pp.27-33
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• 2006

Radiant burners are applicable to drying, preheating and curing in materials manufacturing processes. Radiation efficiency is one of the important performance criteria for these burners. The wide variation in reported radiation efficiencies are partly due to the differences in the measurement techniques. In the present work, water cooled radiant heat flux meter was used to measure radiant heat flux from a metal fiber mat burner. Non-contact type thermometer was also utilized to measure the surface temperature of the burner. Combustion gas was measured by gas analyzers. According to the thermal loads and stoichiometric ratios, radiant heat transfer ratio and combustion performance were discussed here in.

• 대한방사선치료학회지
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• 제17권2호
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• pp.147-153
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• 2005

목 적 : TBI의 자세 잡이 과정에서 실시하는 신체 계측과 보상체 제작 과정을 전산화 단층 모의치료기를 이용하고 그 유용성을 평가하고자 한다. 대상 및 방법 : 환자는 누운 자세를 취하고, 전산화 단층 모의치료기를 통해 영상을 얻었다. 이 영상을 Somavision으로 전송하고 영상을 통하여 신체 계측 점에 대해 계측을 하였다. 계측은 피부를 기준으로 계측을 하고, 폐에 대해서 영상을 이용하여 계측을 하였다. 영상으로 계측된 값을 통해 보상체 두께를 결정하였다. 또한 영상을 통한 보상체 위치를 결정하 고 확인하였다. 선량은 치료실에서 열형광소자를 이용하며 측정하였다. 결 과 : 신체 계측점에서 두께에 대하며 $1{\sim}2cm$의 일반 계측과 영상 계측의 차이를 보였다. 신체 길이는 일반 계측과 영상 계측이 $3{\sim}4cm$의 차이가 있었다. 또한, 영상을 통해 보상체의 밑그림을 그릴 수 있었다. 열형광소자를 이용한 선량 측정 결과 값은 머리, 목, 액와 ,가슴(폐 포함), 무릎 부위는 $92{\sim}98%$로 측정되었고 배, 골반, 서혜부, 발 부위는 $102{\sim}109%$로 측정되었다. 결 론 : TBI의 자세 잡이 과정에서 전산화 단층 모의치료기의 영상을 이용하는 것은 유용하였다. 신체 계측 점두께는 일반 계측과 영상계측의 차이가 적게 계측되었고, 길이에 대한 계측은 정확하게 이루어졌다. 영상을 이용한 계측은 신체 밀도까지 고려한 다양한 보상체 제작이 가능성을 보여주었다. 또한 보상체 위치 잡이를 정확하게 할 수 있고, 보상체의 모 양도 제한 받지 않고 쉽게 제작할 수 있다. 전체적인 치료실 자세 잡이 시간을 $15{\sim}20$분 단축할 수 있었고, 보상체 제작 시간은 약 15분 감소시켰다.

• ETRI Journal
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• 제29권1호
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• pp.124-126
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• 2007

In this letter, we study the impact of single event upsets (SEUs) in space or defense electronic systems which use memory devices such as EEPROM, and SRAM. We built a microcontroller test board to measure the effects of protons on electronic devices at various radiation levels. We tested radiation hardening at beam current, and energy levels, measured the phenomenon of SEUs, and addressed possible reasons for SEUs.

• Radiation Oncology Journal
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• 제36권3호
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• pp.248-253
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• 2018

Radiation protection in the scrotum to reduce the risk of genetic effect in the future is very important. This study aimed to measure the scrotal dose outside the treatment fields by using the radio-photoluminescence glass dosimeter (RPLGD). The characteristics of RPLGD model GD-302M were studied. Scattered dose to scrotum was measured in one liposarcoma case with the prescribed dose of 60 Gy. RPLGDs were placed in three different locations: one RPLGD was positioned at the posterior area which closer to the scrotum, and the other two RPLGDs were placed between the penis and the scrotum. Three RPLGDs were employed in each location. The scattered doses were measured in every fraction during the whole course of treatment. The entire number of 100 RPLGDs showed the uniformity within ±2%. The signal from RPLGD demonstrated linear proportion to the radiation dose (r = 0.999). The relative energy response correction factor was 1.05. The average scrotal dose was 4.1 ± 0.9 cGy per fraction. The results presented a wide range since there was a high uncertainty during RPLGD placement. The total scrotal dose for the whole course of treatment was 101.9 cGy (1.7% of the prescribed dose). The RPLGD model GD-302M could be used to measure scattered dose after applying the relative energy correction factor.

• 방사선산업학회지
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• 제2권3호
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• pp.111-119
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• 2008

Microarrays can measure the expression of thousands of genes to identify the changes in expression between different biological states. To survey the change of whole Salmonella genes after a relatively high dose of gamma radiation (1 kGy), transcriptome dynamics were examined in the cells by using DNA microarrays. At least 75 genes were induced and 89 genes were reduced two-fold or more after irradiation. Several genes located in pSLT plasmid, cyo operon, and Gifsy prophage were induced along with many genes encoding uncharacterized proteins.While, the expression of genes involved in the virulence of Salmonella as well as metabolic functions were decreased. Although the radiation response as a whole could not be illustrated by using DNA microarrays, the data suggest that the response to high dose of irradiation might be more complex than the SOS response.

• 대한방사선기술학회지:방사선기술과학
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• 제41권6호
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• pp.643-649
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• 2018

Recently, together with advancement of domestic aviation industry, overseas tourists using planes have been soared. This study aimed to investigate the risk of diseases for the passengers and flight attendants from the exposed cosmic radiation during the flight by domestic and international literature reviews, as follows. Airliners should develop the program to measure the actual radiation dose and prepare the portable devices for radiation measurement in flight to lower the accumulated dose of cosmic radiation by the attendants. Regulation should be prepared to check the exposed dose during the flight for the passengers by announcement of individual exposed radiation dose which has been provided only to the flight attendants. Passengers and flight attendants should recognize they are exposed to excessive cosmic radiation during the flight and civilians should be protected by the cosmic radiation when they use the flights, which should be prepared by the regulations.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 춘계학술대회
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• pp.459-461
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• 2022

본 논문에서는 실내 환경에서 검출되는 방사능을 측정하기 위한 계측 시스템을 제시한다. 일반 가정, 작업장, 연구소 등 다양한 공간에서 발생되는 방사능을 측정하고 이에 대한 예방을 위함이다. 다중 방사능 센서를 이용해서 여러 공간을 동시에 측정한다. 측정된 방사능 데이터는 지그비를 통해서 실시간으로 PC로 전달하여 모니터링하는 시스템이다. 소량의 방사능이라고 하더라고 만성 피폭으로부터의 예방을 위해 연구소 또는 작업장 같은 방사능 노출이 예상되는 곳은 필수적으로 설치되어야 한다고 생각된다.

• Journal of Mechanical Science and Technology
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• 제16권9호
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• pp.1156-1165
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• 2002

The characteristics of combustion and radiation heat transfer of an oxygen-enhanced diffusion flame was experimentally analyzed. An infrared radiation heat flux gauge was used to measure the thermal radiation of various types of flames with fuel, air and pure oxygen. And the Laser Induced Incandescence (LII) technique was applied to characterize the soot concentrations which mainly contribute to the continuum radiation from flame. The results show that an oxygen-enhanced inverse diffusion flame is very effective in increasing the thermal radiation compared to normal oxygen diffusion flame. This seems to be caused by overlapped heat release rate of double flame sheets formed in inverse flame and generation of higher intermediate soot in fuel rich zone of oxygen-fuel interface, which is desirable to increase continuum radiation. And the oxygen/methane reaction at slight fuel rich condition (ø=2) in oxygen-enhanced inverse flame was found to be more effective to generate the soot with moderate oxygen availability.

• 대한방사선협회지
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• 제30권1호
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• pp.49-57
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• 2004

I. Purpose : Measure the absolute point dose and film dosimetry in intensity modulated radiation therapy (IMRT) of head and neck cancers. A comparison of objective view between measured and calculated dose dlistribution look through optimization algorithm