• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.11a
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• pp.21-21
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• 2005

• Journal of the Korean Wood Science and Technology
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• v.24 no.3
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• pp.57-64
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• 1996

제지공장에서 사용하는 습윤제는 물의 표면장력을 낮춤으로써 목재섬유가 물을 빨리 흡수하여 팽윤하도록 도와준다. 목재섬유가 물을 흡수하여 팽윤하는 과정을 밝히지 위한 연구가 많이 진행되어 왔지만 목재섬유와 물의 상호작용을 상세히 연속적으로 측정할 방법이 전에는 별로 없었다. 목재섬유가 팽윤할 때 발생하는 팽윤압력은 음향방사를 동반하기 때문에 이를 측정하여 팽윤과정을 알아내는 기술이 개발되었다. 본 연구에서는 이 방법을 이용하여 목재를 여러 농도의 습윤제에 담갔을 때 발생하는 음향방사와 중량증가를 측정하여 이 두 변량의 상관을 조사하고 이 방법이 목재의 습윤과정 연구에 유용하게 사용될 수 있는지를 조사하였다. 아까시나무와 라디에타 파인의 두 수종을 사용하였는데 두 수종의 흡수 형태는 매우 달랐다. 5분 동안 용액에 침지하였을 때 후자가 전자보다 10배 정도 더 많이 중량증가하였으며, 발생한 음향방사도 후자가 전자보다 훨씬 많았다. 아까시나무의 중량증가와 음향방사는 습윤제 농도에 거의 무관하였으나 라디에타 파인의 음향방사는 습윤제 농도의 증가에 따라 증가하였으며 라디에타 파인의 중량증가는 습윤제의 표면장력 변화와 일치하였다. 수종별 중량증가와 음향방사의 관계는 아까시나무가 음의 상관을 나타냈으나 라디에타 파인은 양의 상관을 나타내었다. 자비처리 시편은 무처리 시편보다 음향방사가 적었다.

• Journal of the Korean Vacuum Society
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• v.15 no.6
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• pp.547-555
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• 2006

The Pohang Light Source (PLS) of Pohang Accelerator Laboratory (PAL), which was constructed in 1994, is a 3rd generation synchrotron light source user facility. It consists of 2.5 GeV linear accelerator and a storage ring with circumference of 280 m. Presently, 27 beamlines around the storage ring are in operation providing synchrotron radiations to users. In addition, PAL has a construction project of the 4th generation light source. In this paper, the operation status of the PLS is described and the prospect of the 4th generation light source is reviewed.

• Journal of the Korean Society of Radiology
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• v.18 no.1
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• pp.53-63
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• 2024

The purpose of this study was to analyze radiological technologists' (RT) task perceptions of intravenous injection behavior of contrast medium and use it as basic data for future workforce response plans. We surveyed a total of 172 RT using questionnaire terms consisting of demographic characteristics, job priorities, and RT' task perceptions of intravenous injection behavior. Statistical analysis was performed using descriptive statistics, frequency analysis, independent samples T-test, and ANOVA analysis. As a result, first, current clinical RT were highly aware of the need for intravenous injection behavior as a response to the future workforce of them, and the workload burden resulting from this was evaluated as low. Second, the fear of intravenous injection behavior was found to be significant, so it is judged to be useful to perform them as selective job actions rather than all RT' task. Third, the need for training courses and certification for RT' intravenous injection behavior is being raised, and additional specific research on this is required. Last, RT' positive perception of intravenous injection behavior could be expected as a foundation for improving national medical services, strengthening RT expertise, and expanding tasks.

• Journal of Energy Engineering
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• v.10 no.2
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• pp.114-119
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• 2001

TRIGA Mark-II&III 연구로서의 운영과정에서 발생된 방사성 슬러리 함유 폐액에 대하여 음이온, 앙이온, 그리고 비이온 응집제를 첨가하였을 때의 여과 효과를 실험실 규모의 진공여과 장치로 연구하였다. 여과 실험 자료를 이용하여 Darcy’s Law에서 유도된 여과 케익 저항 값을 산출하였다. 응집제 사용으로 응집제를 사용하지 않은 경우롸 비교하여 케익 저항값의 개선은 있었지만, 수분함량은 증가하였다. 각각의 응집제 사용에 따른 침전율, 여과 케익의 수분함량, 그리고 여과 케익 저항 값을 비교한 결과 음이온 응집제 12~16ppm/$\ell$ waste를 사용하였을 경우가 가장 효과적인 것으로 나타났다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2009.11a
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• pp.115-116
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• 2009

• 동위원소뉴스
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• no.10 s.10
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• pp.1-1
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• 1997

• 동위원소뉴스
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• no.2 s.62
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• pp.5-8
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• 2002

• Development and Reproduction
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• v.9 no.2
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• pp.65-83
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• 2005

The three important phases in the development of ligand immunoassays are identified and summarized. The competitive radiolabelled hormone measurement had been developed in the first and early in the second generations(1950s to 1960s), such as radioimmunoassays(RIA) or immunoradiometric(saturation) assays(IRMA), and used in all most of the hormone and also analyte in biological samples. In the second generation, ultrasensitive non-isotopic immunoassays(NIA) were developed using monoclonal antibodies(McAb), labelling the McAb and high specific activity non-isotopic labels. After their usefulness, advantages and disadvantages has been evaluated and non-competitive methods are discussed. The chip/microarray based multianalyte ligand assays(microspot or genechip methods) are developed and known as alternative ones in the third generation. We summarize the developments of NIAs and its usefulness, and then introduce briefly the new ligand assays.

• The Korean Journal of Nuclear Medicine
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• v.32 no.4
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• pp.391-395
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• 1998

Purpose: Chitin and chitosan are nontoxic natural chelators that chelate radiostrontium effectively. The purpose of this study was to compare radiostrontium chelation of chitin and chitosan with that of well known chemical chelators, namely EDTA and DTPA. Materials and Methods: The chelaton rates of chitin, chitosan, EDTA and DTPA were compared using a column chromatography method (Sephadex G-25M, Sweden). Three kinds of chitins and four kinds of chitosans were used. All of them were water soluble. Results: Phosphated chitosan showed the highest chelation yield of 97% at pH 7. All of chitins, chitosans, EDTA and DTPA showed chelation yield of more than 90% independent of varing pH level. Conclusion: Chitin and chitosan have similar chelation rate as compared with EDTA and DTPA.