• Journal of the Korean Ceramic Society
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• v.37 no.8
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• pp.799-804
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• 2000

Coulometric titration experiments have been done for copper doped cobaltous oxide (Co1-xCux)1-$\delta$ O with various dopant concentrations. We present the obtained experimental data and compare our results to those of previous thermogravimetric investigation. The experimental data are fitted by theoretical calculations based on various defect models. For this modeling, we considered different types fo major defects like copper in substitutional and interstitial lattice sites as well as copper vacancy. We also introduced the copper evaporation effect during titration experiment into our consideration.

• The Korean Nurse
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• s.5
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• pp.35-39
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• 1963

요약하건데 ICN은 종합적 기초간호교육의 근본원리를 인정하고 이 목적을 달성하기 위하여 회원국들을 도와주어야 한다. ICN의 교육부 간부가 고문과 working party의 도움으로 현재 만든 ''기초 간호교육에 대한 국제적 질의''는 국제적인 견해를 근거로 하여 가치있는 결론과 건의를 가져와야 한다. 이것은 전체의 결말이 회원국을 적극적으로 후원하는 결과를 초래하여야 한다. ICN의 Grand Council은 이외로 표명된 의견을 주의 깊게 귀를 기울이고 종합적 기초간호교육을 강요해서는 안 된다. 최후로 Grand Council.은 일반 간호원이 아닌 소아과 간호원 등과 같은 특수분야 하나만을 훈련받은 간호원들의 지위를 재 고려하여야 할 것이다. 자기 나라에서 ''전문 간호원''으로 간주된다면 그 간호원들을 전문부(specialized section)에 ICN회원으로 받아 들일 수 있다는 것이 내 의견이다. 이것은 궁극적으로 ICN을 보다 강화할 것이며 경쟁적인 단체의 형성을 방지할 것이다.

• Journal of Practical Agriculture & Fisheries Research
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• v.5 no.1
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• pp.57-63
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• 2003

The bovine rotavirus(BRV), bovine coronavirus(BCV) and bovine viral diarrhea virus(BVDV) are main viruses of bovine viral diarrhea disease. These viruses could be rapidly amplified by the reverse transcriptase polymerase chain reaction(RT-PCR). This study was conducted to develop rapid and accurate diagnostic methods of these viral diseases by multiplex RT-PCR. Specific primers were designed based on the sequences reported by Chang KO et. al. (1997) and Schroeder BA, et. al. (1990), RNA were prepared from the cultured viruses, first-stranded DNAs were synthesised by reverse transcriptase. PCR were conducted to amplify specific regions of the viruses by multiplex. Three bands such as 1,062bp for BRV, 458bp for BCV, and 300bp for BVDV were successfully produced by multiplex RT-PCR. In conclusion, this result suggested that these viruses could be diagnosed rapidly and accurately by multiplex RT-PCR.

• Korean Journal of Childcare and Education
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• v.9 no.5
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• pp.79-107
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• 2013

The purpose of this study purpose was to analyze the structural model of variables such as experiences and personal- and professional- beliefs of cultural diversity, and the culturally responsive teaching efficacy of early childhood preservice teachers including identifying the beliefs as mediating variables. Another purpose was finding the different structural relations among the research variables according to the stages of a teacher education program. The participants were 273 students who enrolled in K grade teacher education programs in the southwest areas of the U.S. The research variables were measured with the items used by Schroeder (2008), Pohan and Aguilar (2001), and Siwatu (2007). The structural equation model analysis showed that the direct effects were found between the paths from the cultural diversity experiences and personal beliefs to the culturally responsive teaching efficacy, from the experiences to personal beliefs, from the personal to professional beliefs. The personal beliefs were identified as a mediator of the path from the experiences to professional beliefs. By multi-group analysis, the path from professional beliefs to the culturally teaching efficacy showed a meaningful difference between the initial and final stage groups of a teacher education program. Suggestions for future research and early childhood teacher education programs were presented based on the results.

• Journal of Korean Association for Spatial Structures
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• v.7 no.2 s.24
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• pp.105-114
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• 2007

Large span spaces have been widely used for various purposes including sports events in other countries. Due to increasing demands on multi-purpose use of such spaces, recently built large span sport facilities such dome stadiums have been required to accommodate sport events as well as performing events. Also, retractable ceilings and/or walls were generally adopted in those spaces for providing various event conditions. It seems obvious that the openings between diffuse fields and free field may cause difficulties in the acoustic design of such spaces In the present work, the acoustic characteristics of non-diffuse field has been investigated using 1/10 acoustic scale models. It was found that RTs at low- and mid-frequencies decayed faster than those at high-frequencies as the percentage of opening area increased. The decay rate of RTs at high frequencies were not influenced by increasing the area of an opening. Also high dependence of EDT on the percentage of opening area was observed at all frequency range. D50 was not improved by increasing the area of an opening up to 12.5% and then sharply increased. The application of Schroeder integration to evaluate the reverberation charateristics of coupled spaces may not be proper, since non-exponential decay process with double or triple decays of those spaces can not be properly defined. EDT seems more appropriate to predict reverberation at the early acoustic design stage of acoustically coupled spaces.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.2
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• pp.227-233
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• 2001

Electromagnetic field characteristics of Reverberation chamber, which could be applicable for an alternative test facility of electromagnetic interference and radiated electromagnetic susceptibility have been investigated. To obtain the required field uniformity of reverberation chamber, Schroeder method Quadratic Residue Diffuser was designed to be applied to chamber. In this paper, 3 different types of diffusers depending on diffuser's periodic direction have been used to investigate field characteristics of each type by using FDTD numerical method. The results show all 3 types of reverberation chambers have below $\pm$3 dB tolerance of field uniformity characteristics, and the symmetrical, type 3, structure show better results among them.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.36 no.5 s.108
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• pp.62-68
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• 2004

The amount of non-lignin components in unbleached and oxygen-delignified kraft pulps and their impact on lignin determinations was investigated. The lignin analyses investigated were kappa number and Klason lignin in conjunction with acid-soluble lignin. The species investigated were loblolly pine, and aspen. The non-lignin components that impacted on lignin determination were residual extractives and hexenuronic acid in unbleached and oxygen-delignified kraft pulps. In the hardwoods, significant amounts of extractives remained after kraft pulping and oxygen delignification. These residual extractives in the hardwood pulps had an impact on the lignin determination, more so on the acid lignin method than kappa number. Hexenuronic acid only impacts on kappa number determination both softwood and hardwood pulps, not on acid lignin. Hexeneuronic acid contributed as lignin content more in aspen than pine pulps, and more in oxygen-delignified than unbleached kraft pulps. Impact of hexenuronic acid on should be corrected both softwood and hardwood pulps for accurate kappa number.

• Proceedings of the Korean Society for Applied Microbiology Conference
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• 2003.06a
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• pp.95-102
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• 2003

• Nuclear Engineering and Technology
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• v.37 no.5
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• pp.447-456
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• 2005

Laser driven accelerators promise to provide an alternative to conventional accelerator technology. They rely on the excitation of large amplitude density waves in a plasma by the photon pressure of an intense laser. The density oscillations in which electrons and ions are separated, result in extremely large longitudinal electric fields that can be several orders of magnitude larger than those that are used in today's radio-frequency accelerators. Whereas this principle had been demonstrated experimentally for nearly two decades, it was not until 2004 that the production of high quality electron beams around 100 MeV was demonstrated. Analysis, aided by particle-in-cell simulations, as well as experiments with various plasma lengths and densities, indicate that tailoring the length of the accelerator, together with loading of the accelerating structure with beam, are the keys to production of mono-energetic electron beams. Increasing the energy towards a GeV and beyond will require reducing the plasma density and design criteria are discussed for an optimized accelerator module. The current progress and future directions are summarized through comparison with conventional accelerators, highlighting the unique short and long term prospects for intense radiation sources and high energy accelerators based on laser-drivenplasma accelerators.

• Wind and Structures
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• v.24 no.2
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• pp.185-204
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• 2017

High-resolution wind measurements at 2.25 m in height were used to investigate the mean and turbulence properties of an extreme thunderstorm wind event in West Texas. These data were combined with single Doppler scans from the Texas Tech University Ka-band mobile Doppler radars systems (TTUKa) to provide meteorological context over the surface measurement stations for portions of the outflow. Several features characteristic of a severe wind event were noted in the radar data, including a bowing portion of the thunderstorm complex and a small circulation on the leading edge. These features were reflected in the surface wind time histories and provided natural separation between various regions of the outflow. These features also contributed to the peak 1-s gust at all measurement stations. The turbulence characteristics of each outflow region were also investigated and compared. Reduced values of running turbulence intensity and elevated values of longitudinal integral scales were noted during the period of peak wind speed. Larger scales of turbulence within the outflow were also suggested via spectral analysis.