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중국유학생을 위한 지역사회경험학습(CBL)기반의 한국문화교육에 관한 연구
박응석 한국중국어교육학회 2018 중국어교육과연구 Vol.0 No.27
Students, schools and communities can expect the following benefits if the subject “Understanding Korean Culture Content” is launched in line with the study’s goal. First, Chinese students in Korea can enter their majors without the burden of communication. Second, learning about community experiences based on physical capabilities will give Chinese students a chance to become familiar with professors and friends, and help them learn about the new hobbies or to become familiar with Wonju. Third, the community institutions associated with each Korean cultural content in Wonju could be linked to the classes to help them find alternative ways to internationalize the Korean cultural contents in Wonju. Fourth, if the subject runs well, it could be expanded not only to majors in global elite divisions, but also to overseas students in university with short-term degrees.
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고상반응법에 의해 제조된 Zn_2SiO_4:Mn 녹색 형광체의 발광 특성
박응석,장호정,허경무,조태환 단국대학교 신소재기술연구소 1997 신소재 Vol.7 No.-
MnO_2와 MNCO_3를 활성체로 사용하여 Zn_2SiO_4: Mn 녹색 형광체를 고상반응법에 의해 제조하고, 이들 시료에 대해 소결온도, 활성제 종류 및 농도에 따른 발광 특성 및 결정성 등을 조사 하였다. MnCO_3를 활성제로 사용한 형광체 시료의 경우, Mn의 도핑농도를 X=0.08(Zm_2-xMn_xSiO_4)로 첨가하여 1300℃에서 4시간 질소분위기에서 소결한 형광체 시료에서 최대 발광휘도 와 양호한 색순도를 나타내었다. 활성제로 MnO_2를 사용한 경우가 MnCO_3를 첨가한 경우보다 발광 스펙트럼강도가 떨어지는 경향을 보여 주었으며, 이 결과는 MnO_2 활성제의 경우 Mn의 부적절한 원자가에 기인하는 것으로 판단된다. SEM 관찰결과 형광체 분말의 입도 크기는 약 3∼6 ㎛를 나타내었다. We have prepared a good quality Zn_2SiO_4: Mn green phosphors using MnO_2 and MnCO_3 as activators by the solid state reaction method. The luminance properties and crystalline qualities were investigated as functions of the firing temperature and activator concentrations. In Zn_20xMn_2SiO_4, the phosphors doped with MnCO_3, Mn concentration of X=0.08 showed the highest intensity of emission spectra and good color purity at the firing temperature of 1300℃ for 4hrs under N_2 atmospher. At the same concentration and firing condition, the emission spectrum peaks of the phosphors doped with MnO_2 were lower than those of samples doped with MnCO_3. This may be due to the improper valence state of Mn cation. As Mn contents increased, the maximum of emission spectra shifted slightly toward higher wavelength. From the SEM micrograph, it was found that the phosphors were composed of small grains about 3∼6㎛.
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전력 생산 에너지 비중 구조에 따른 주요 국가별 효율성 비교
박응석,김대철 경성대학교 산업개발연구소 2016 산업혁신연구 Vol.32 No.1
본 연구에서는 OECD 국가와 비 OECD 국가의 전력 생산 효율성을 살펴보았다. 전력 생산 효율성을 분석하기 위해 연구방법으로는 DEA와 Post-DEA를 활용하였다. 이러한 연구방법을 토대로 각 국가의 전력생산 효율성과 단계적 벤치마킹 대상을 파악하고, 각 국가의 전력 생산을 위한 개별 에너지원의 비중이 효율성과 연관성 있는 패턴을 보이는지 살펴보았다. 이러한 결과를 바탕으로 본 논문은 효율성 관점에서의 전력 생산 에너지원의 비중에 대해서 정책적인 제언을 하였다. DEA 분석 중 CCR 모델에서 가장 효율성이 높은 국가는 전체 19개 국가 중 5개 국가였으며 전체 평균 효율성은 0.883이었다. 한편, BCC 모델에서 가장 효율성이 높은 국가는 12개 국가였으며 전체 평균 효율성은 0.951이었다. Post-DEA인 Tier 분석을 실시하여 단계적 벤치마킹의 대상을 파악하였다. 전체 3그룹 중 Tier 1에는 한국을 포함한 5개 국가가 선정되었으며 Tier 2에는 7개 국가, Tier 3에는 4개 국가가 선정되었다. 이러한 결과로 상대적으로 더 높은 국가별 전력 효율성을 벤치마킹하는 경로 정보를 얻을 수 있었다. 또한, 효율적인 국가들의 에너지 비중을 파악하였다. 전력 효율성은 각 국가가 보유하고 있는 부존자원의 유무에 따라 차이가 생긴다는 특징을 발견할 수 있었다. 대부분의 효율적인 국가는 충분한 부존자원인 화석에너지를 사용하고 있었다. 충분한 부존자원이 없는 국가들은 전력 효율성 차원에서 원자력에너지를 사용하였다. 한국은 부존자원이 없지만 가장 효율적으로 전력을 생산하는 국가이기 때문에 한국은 원자력에너지를 사용하는 정책을 유지하는 것이 효과적일 수 있다. In this research, the efficiency of generating electricity for major OECD countries and non-OECD countries was studied. DEA and Post-DEA methods were used to analyze efficiency of generating electricity. Under these research methods, it figured out electric efficiency of each of countries and phased benchmarking objects as well as the distinctive feature of efficient countries by electricity production sources’ composition. With these results, this paper suggested a policy about the composition of electricity production sources in terms of efficiency. The overall average efficiency was 0.883 and 5 countries of all 19 countries were the most efficient counties in CCR model. On the other hand, there were 12 countries which were the most efficient countries in BCC model with the overall average efficiency 0.951. In tier analysis, it divided each of countries into 3 groups. They are 5 countries in Tier 1 groups including of Korea, 7 countries in Tier 2 groups. and rest of countries that did not be included in these Tier groups. This result could give information about the way of benchmarking to make better electricity efficient countries. Also, an energy composition of the efficient countries was found. There is distinctive feature that electricity efficiency was depended on how much the endowed resources were held. Most of the efficient countries using fossil energy sources had sufficient endowed resources. Otherwise, using nuclear energy was recommended in terms of electric energy efficiency. Because Korea is one of the most efficient country even though does not have sufficient endowed resources, Korea should keep their generating policy using nuclear energy to generate electricity efficiently.
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Ga 도핑된 $\textrm{Zn}_{2}\textrm{SiO}_{4}$: Mn 녹색 형광체의 발광특성
박응석,장호정,조태환,Park, Eung-Seok,Jang, Ho-Jeong,Jo, Tae-Hwan 한국재료학회 1998 한국재료학회지 Vol.8 No.9
We investigated the photoluminescence and the crystalline properties with Ga doping concentrations (0-12 mol%) in $\textrm{Zn}_{1.98}\textrm{Mn}_{0.02}\textrm{SiO}_{4}$ green phosphors prepared by the solid state reaction. The photoluminescence was improved by a doping of Ga element in $\textrm{Zn}_{1.98}\textrm{Mn}_{0.02}(\textrm{Si_{1-x}\textrm{Ga}_{x})\textrm{O}_{4}$ phosphors which showed the highest emission intensity and good color purity in the doping concentration of x=0.08. The emission intensity of $\textrm{Zn}_{1.98}\textrm{Mn}_{0.02}(\textrm{Si_{1-x}\textrm{Ga}_{x})\textrm{O}_{4}$(x= 0.08) phosphors was increased to 7 times with increasing the sintering temperatures from $1100^{\circ}C$ to $1400^{\circ}C$, showing the improved crystalline quality. The decay time was not affected by Ga doping concentrations with constant values around 24ms. It was found from SEM and PSA analyses that the phosphors were composed of a large number of small grains around 1-3$10\mu\textrm{m}$ with a small amounts of agglomerated particles above $10\mu\textrm{m}$.
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박응석,장호정,조태환,Park, Eung-Seok,Jang, Ho-Jeong,Jo, Tae-Hwan Materials Research Society of Korea 1999 한국재료학회지 Vol.9 No.1
$\textrm{Zn}_{2-x}\textrm{Mn}_{x}\textrm{SiO}_{4}$ green phosphors have been prepared by the solution reaction method and the photoluminescence and crystalline properties were studied as a function of both the firing temperature ($900^{\circ}C$~$1200^{\circ}C$) and the concentration of Mn activator (x=0.01~0.20). Under 147 nm and 254nm and excitation sources, the emission intensity of the phosphors was increased about 4 times increasing firing temperatures from $900^{\circ}C$ to $1200^{\circ}C$. From the XRD analysis, $\textrm{Zn}_{2}\textrm{SiO}_{4}$:Mn phosphors fired above $1100^{\circ}C$ showed willemite crystal structure. Under 147nm excitation, the maximum emission intensity was obtained at the Mn concentration of x=0.02 for $\textrm{Zn}_{2-x}\textrm{Mn}_{x}\textrm{SiO}_{4}$ phosphors fired at $1200^{\circ}C$ and the concentration quenching was occurred at the Mn concentration above x=0.10. The phosphor particles showed almost spherical shapes with the average size of around 2~3$\mu\textrm{m}$ by the SEM morphology.
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