• Bulletin of the Korean Chemical Society
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• 제17권12호
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• pp.1109-1111
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• 1996

The Podand Ⅰ (Figure 1) has been studied as cation carrier in a bulk liquid membrane system. Ag+ and some other transition metal ions (M2+=Cu, Ni, Co, Zn, and Cd) have been transported using the podand as carrier in a bulk liquid membrane system. Studies on the transport of equimolar mixtures of two or three competing components have also been carried out with the same system. Ag+ exhibited a higher transport rate than the other M2+ in the competitive experiments. Ligand structure and the equilibrium constant for complex formation are important parameters in the transport of the metal ions.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1138-1142
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• 2005

We achieved a highly efficient green OLED with an efficiency of 30cd/A by using a new electron transport material and optimizing the device structure. The luminous efficiency was 16.8lm/W at $3000cd/m^2$ and the lifetime was over 60,000hr at an initial luminance of $1000cd/m^2$. Furthermore, we obtained a threecomponent RGB white OLED by using the highly efficient green material. This RGB white OLED shows more excellent color reproducibility for full color displays with color filters, compared to a twocomponent white OLED.

• Bulletin of the Korean Chemical Society
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• 제16권1호
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• pp.33-36
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• 1995

Macrocyclic ligands have been studied as cation carriers in a supported liquid membrane system. Cd2+ has been transported using nitrogen substituted macrocycles as carriers and several divalent metal ions (M2+=Zn, Co, Ni, Cu, Pb, Mg, Ca, and Sr) have been transported using DBN3O2, DBN2O2and PolyNtnoen as carriers in a supported liquid membrane system. Competitive Cd2+-M2+ transport studies have also been carried out with the same system. Ligand structure, stability constant, membrane solvent and carrier concentration are also important parameters in the transport of metal ions.

• 한국해양환경ㆍ에너지학회지
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• 제11권4호
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• pp.191-198
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• 2008

$CO_2$ 해양지중저장 처리 시스템 설계를 수행하는데 있어 전산모사를 통한 공정 설계는 필수적이다. 즉, 수치 모델링을 이용하여 $CO_2$ 해양지중저장 처리 공정 중 발전소 및 제철소 등 대규모 발생원에서부터 $CO_2$를 포집하는 포집공정, 포집한 $CO_2$를 파이프라인이나 선박 등을 통해 이송하는 수송공정, 이를 깊이 800m 이상의 해저 지질구조내 대규모로 수백-수천년 이상 장기간 저장하는 저장공정 등 일련의 공정을 열역학 상태방정식 등을 이용하여 모사하는 것이다. 본 논문에서는 $CO_2$ 해양지중저장 처리를 위한 공정 설계에 사용되는 열역학 상태방정식들을 비교 분석하고 이들이 압축 및 수송공정에 미치는 영향 등을 평가하였다. 이와 같은 연구결과에 근거하여 $CO_2$ 해양지중저장 처리를 위한 압축 및 수송 공정 설계 시 유용한 열역학 상태방정식을 제안하였다. 상태방정식 계산결과 간의 비교 및 영향 평가를 위하여 순수 단일성분 $CO_2$와 순산소 연소 석탄 화력발전소에서 포집된 $CO_2$ 혼합물의 압축 및 수송거동을 분석하였다. 순수 단일성분 $CO_2$의 압축 및 수송공정 계산결과에는 이상기체 상태방정식을 제외한 상태방정식 간에 큰 차이가 존재하지 않으나, NO, Ar 그리고 $O_2$ 등이 포함된 순산소 연소 석탄 화력발전소에서 포집된 $CO_2$ 혼합물의 압축 및 수송공정에는 PR 계열의 상태방정식과 BWRS 상태방정식에서 커다란 차이가 나타났다. 즉, 8bar 이상의 압력, $30^{\circ}C$ 내외의 온도 영역에서 $CO_2$ 혼합물을 서로 다른 상태로 예측하였다. 이러한 불순물의 영향으로 인하여 $CO_2$ 혼합물의 압축 및 수송공정 설계에 PR계열의 PRBM 상태방정식의 적용이 BWRS식 적용보다 유용하다고 판단된다.

• 설비공학논문집
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• 제29권4호
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• pp.195-201
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• 2017

In this study, the viscosity of a $CO_2-gas$ mixture was investigated for the transportation of the captured $CO_2-gas$ in pipelines and for the designing of a thermal system, both of which involve the utilization of the $CO_2-gas$ mixture. The viscosities of the $CO_2-gas$ mixture, $CO_2+CH_4$, $CO_2+H_2S$, and $CO_2+N_2$ were predicted using three different models as follows : Chung, TRAPP, and REFPROP. The predictability values of the models were validated by comparing the estimated results with the experiment data for the $CO_2+CH_4$ and $CO_2+N_2$ under high-density conditions. The Chung model showed 2.41%, which is the lowest mean deviation of the prediction among the model. Based on the Chung model, the mixture mole fractions were changed from 0.9, 0.95, and 0.97, the mixture pressure was ranged from 80 bar to 120 bar by 10 bar, and the mixture temperature was varied from 310 K to 400 K by 10 K to observe the effects of the parameters on the mixture viscosity. Considering the high mole fraction of the $CO_2$ in the mixture, a significant variation of the mixture viscosity was observed close to the pseudo-critical temperature, and the viscosity for the $CO_2+H_2S$ mixture shows the highest values compared with those of the $CO_2+CH_4$ and $CO_2+N_2$.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2005년도 추계 학술대회 논문집
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• pp.339-347
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• 2005

IP-2형 운반용기는 정상운반조건의 낙하시험을 거친 후에 방사성내용물의 유실 또는 분산이 없고 외부표면에서의 방사선량률이 $20\%$ 이상 증가할 수 있는 차폐능력의 상실이 없어야 한다. 차폐체의 두께가 큰 경우에는, 볼트체결방식을 사용하면 IP형 운반용기로 많이 사용되고 있는 ISO 컨테이너에서의 문을 사용하는 경우보다 방사성내용물의 유실 또는 분산이 일어나지 않을 것이다. 본 연구에서는 볼트체결방식의 IP-2형 운반용기에 대한 낙하시험을 실시하기 전에, 낙하방향에 따른 볼트인장력과 볼트체결력을 시험으로 평가하는 방법을 알아보기 위하여 예비시험모델을 제작하여 시험 및 평가하였다. 바닥과 뚜껑방향의 수직낙하, 수평낙하, 4방향의 경사낙하 등 총 7가지 낙하방향으로 자유낙하를 실시하였다. 낙하충격에 의한 볼트인장력은 힘센서를 이용하여 측정하였고, 볼트체결력은 낙하시험 전의 체결토르크에서 낙하충격 이후의 풀림토르크의 변화를 이용하여 알아보았다.

• Journal of Radiation Protection and Research
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• 제41권3호
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• pp.310-314
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• 2016

Background: FCTC10 container is designed to transport $^{60}Co$ radioactive sources used in irradiation industry. It belongs to Type B(U) Category III (yellow) package when being loaded with a $^{60}Co$ source of $1.8{\times}10^5$ Ci. Materials and Methods: The container is constituted of shielding container, basket, protective cover and bracket. Shielding ability is provided mainly by stainless steel shells, tungsten alloy and lead among steel shells. Radiation level around the container has been calculated with both Monte Carlo simulations and measurements. Results and Discussion: It is proven that the shielding performance of the container fulfills the requirements in GB11806-2004 (Regulations for the safe transport of radioactive material, China Standard Press). Exposure doses to workers and to critical groups of public were calculated based on hypothetical exposure scene according to transport practice experience. Conclusion: The results show that doses to workers and public are less than the constraint dose considered in design, and the radiation level would be increased less than a factor of 2 under design basis accidents.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제52권2호
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• pp.85-90
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• 2003

In this work $Cd_{4}GeSe_{6}$ and $Cd_{4}GeSe_{6}$ : $Co^{2+}$ single crystals were grown by the chemical transport reaction method and the structure of $Cd_{4}GeSe_{6}$ and $Cd_{4}GeSe_{6}$ : $Co^{2+}$ single crystals were monoclinic structure. The temperature dependence of optical energy 9ap was fitted well to Varshni equation. Also, the entropy, enthalpy and heat capacity were deduced from the temperature dependence of optical energy gap.

• Nuclear Engineering and Technology
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• 제40권6호
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• pp.511-516
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• 2008

Korea Hydro & Nuclear Power Co., Ltd. (KHNP) developed new IP-2 packages to transport low- and intermediate-level radioactive waste (LILW) steel drums from nuclear power plants to a disposal facility in accordance with IAEA and Korean transport regulations of radioactive material. Radiation shielding evaluation of the packages was carried out to demonstrate compliance with the regulatory requirements for IP-2 packages of radioactive material. Dose rate limits of LILW drums contained in the packages were determined.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 춘계학술대회 논문집
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• pp.3-7
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• 2004

$HgGa_2S_4:CO^{2+}$ single crystal were grown by the chemical transport reaction(CTR) method. 1n the optical absorption spectrum of the $HgGa_2S_4:CO^{2+}$ single crystal measured at 298K, three groups of impurity optical absorption peaks consisting of three peaks, respectively, were observed at 673nm, 734nm, and 760nm, 1621nm, 1654nm, and 1734nm, and 2544nm, 2650nm, and 2678nm. At 10K, the three peaks(673nm, 734nm, and 760nm) of the first group were split to be twelve peaks. These impurity optical absorption peaks are assigned to be due to the electronic transitions between the split energy levels of $Co^{2+}$ sited in the $S_4$ symmetry point.