• Journal of Environmental Science International
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• v.15 no.11
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• pp.997-1002
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• 2006

This report presents a voltammetric assay of dinitrotoluene using a DNA immobilized onto a carbon nanotube paste electrode (PE). The cyclic voltammetry (CV) and square wave (SW) stripping voltammetry parameters of the optimized conditions were obtained. An anodic peak current appeared at 0.3 V (versus Ag/AgCl) in a 0.1-M $NH_4H_2PO_4$ electrolyte solution. The detection limit was found to be $0.6ngL^{-1}$(S/N = 10), within a deposition time of 100 sec.

• Journal of Environmental Science International
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• v.17 no.7
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• pp.711-717
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• 2008

The use of support materials on the nanoparticle synthesis and applications has advantages in many aspects; resisting the aggregation and gelation of nanoparticles, providing more active sites by dispersing over the supports, and facilitating a filtering process. In order to elucidate the influence of the supports on the nitrate reduction reactivity, the supported iron nanoparticles were prepared by borohydride reduction of an aqueous iron salt in the presence of supports such as activated carbon, silica and polyethylene. The reactivity for nitrate reduction decreased in the order of unsupported Fe(0) > activated carbon(AC) supported Fe(0) > polyethylene(PE) supported Fe(0) ${\ge}$ silica supported Fe(0). Rate constants decrease with increasing initial nitrate concentration implying that the reaction is limited by the surface reaction kinetics.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.231-235
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• 2007

낙동강 본류 상류의 2005년 4월${\sim}$2007년 1월까지의 자연수에 대한 평균 탈산소계수 값은 0.553 $day^{-1}$의 값을 보였다. 중류 구간의 경우 0.384 $day^{-1}$, 하류의 경우는 0.252 $day^{-1}$을 각각 보였다. 또한 낙동강 본류 상${\cdot}$중${\cdot}$하류의 평균 실험실 탈산소계수 값은 상류 0.270 $day^{-1}$, 0.289 $day^{-1}$, 하류 0.283 $day^{-1}$로 낙동강 상류의 탈산소계수 값이 다소 높게 조사 되었다.

• Publications of The Korean Astronomical Society
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• v.16 no.1
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• pp.43-47
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• 2001

We developed a CCD camera that can observe wide fields on the sky. We tested the field of views using various lenses. For cooling the CCD chip, we used a thermoelectric cooling device and tested the cooling efficiency. This camera will continuously observe a part of the sky. The data from the camera will be used to decide the current weather condition by the real-time star counting program (SCount) which will be developed later.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.2
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• pp.48.1-48.1
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• 2016

남십자자리(Crux)는 현재 북반구 중위도 지역에서는 관측할 수 없는 별자리지만 고대 중국의 전통 별자리 체계가 성립되던 시기인 춘추전국시대만 하더라도 지평선 부근에서 쉽게 관측할 수 있는 별자리였다. 우리는 세차운동 계산을 통해 남십자자리가 출몰성에서 전몰성으로 변했음을 확인하였고, 고대 중국의 문헌 기록과 성표, 성도의 별자리 그림 분석을 통해 남십자자리의 밝은 4개의 별이 중국의 전통 별자리인 고루성(庫褸星)과 일치함을 확인하였다. 또한 남십자자리가 관측되던 시기와 관측되지 않던 시기에 각각 작성되었던 성표와 성도 분석을 통해 고루성의 별자리 모양이 점차 변형되어 갔음을 제시하였다. 마지막으로 서양의 천문기술이 중국에 전해 진 이후 진행된 동서양의 별자리 상호 비교 및 동정 결과들을 분석하여 중국의 전통 별자리 체계에서 어떻게 고루성이 완전히 배제되게 되었는지에 대한 논의를 포함, 본 연구의 초기 결과들을 발표할 예정이다.

• The Journal of the Korean bone and joint tumor society
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• v.7 no.4
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• pp.157-161
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• 2001

Nearly a quarter of cases of non-Hodgkin's lymphoma present with extranodal, but rarely involve the soft tissue. The authors experienced one case of non-Hodgkin's lymphoma presenting as voluminous subcutaneous tissue tumors in the left axilla and arm.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05b
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• pp.121-124
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• 2006

Lightweight aggregate is mainly consist of multi-crystalline structure. It may be abnormal water moving by the change of external circumstance because of its specific portion being between components and aperture. So it has some difficulty in forming without concise method about absorbing character and water-containing point even though it is used to water-containing condition over the 24 hours of absorbing amount in present. This study has main idea on the characteristics of absorption on the pressurization of lightweight aggregate.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2014.05a
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• pp.254-255
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• 2014

This study is a part of development to improve early-age compressive strength of concrete by using industrial by-products. It tried to investigate the characteristics of early-age compressive strength according to curing temperature and industrial by-product replacement ratio 10, 20, and 30 %. As a result, regardless of industrial by-product replacement ratio and age, early-age compressive strength of concrete was found to be high compared to Plain using 100 % cement.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2014.05a
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• pp.108-109
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• 2014

The purpose of this study is to enhance durability of solidifying mat. solidifying mat excellent mechanical properties of geotextile. multi-layer coating system is applied to the mat and the chloride ions penetration resistance, chemical resistance, accelerated carbonation test were evaluated by testing the durability. Durability test results are as follows. chloride ions penetration resistance results are coated mat is approximately 70 % lower than plain. chemical resistance test results are coated mat no discoloration. accelerated carbonation test results are coated mat is approximately 90 % lower than the plain.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2009.04a
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• pp.203-206
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• 2009

Articulation Index(AI) is the one of the evaluating methods for the interior sound of the automobiles. The AI measures the articulation level of the sound in the vehicle cabin as passengers talk to another. In this study, the effects of AI were investigated according to the various structures of tire. As the structures of tire were changed, the road noise of the vehicle tire was measured using objective measurement. From this measurement data, the AI was calculated. The AI of front is larger than that of rear. Increasing the tread hardness of tire or decreasing the apex height the AI is improved.