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Dielectric and Ferroelectric Properties of EuxBa1-xTiO3 Fine Ceramics
최병춘,전병억,김은지,김유성,김진수,문병기,Jung Hyun Jeong 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
EuxBa1-xTiO3 (EBT, x = 0.01 ∽ 0.1) fine ceramics were prepared from EBT nanoparticles, where the sol-gel method was employed to substitute Eu homogeneously for Ba in the BaTiO3. With calcining and sintering the EBT nanoparticles, the grain sizes of EBT fine ceramics were measured to be about 0.1 ∽ 1.0 μm by using scanning electron microscopy. The EBT fine ceramics exhibited the ferroelectric D-E hysteresis. The Curie temperature shifted toward 70 ℃ for EBT (x = 0.10) fine ceramics and displayed diffuse phase-transition behaviors. The Curie temperature of EBT is thought to be lowered by the incorporation of Eu ions, where Eu substituted for Ba in the A sites of BaTiO3. EuxBa1-xTiO3 (EBT, x = 0.01 ∽ 0.1) fine ceramics were prepared from EBT nanoparticles, where the sol-gel method was employed to substitute Eu homogeneously for Ba in the BaTiO3. With calcining and sintering the EBT nanoparticles, the grain sizes of EBT fine ceramics were measured to be about 0.1 ∽ 1.0 μm by using scanning electron microscopy. The EBT fine ceramics exhibited the ferroelectric D-E hysteresis. The Curie temperature shifted toward 70 ℃ for EBT (x = 0.10) fine ceramics and displayed diffuse phase-transition behaviors. The Curie temperature of EBT is thought to be lowered by the incorporation of Eu ions, where Eu substituted for Ba in the A sites of BaTiO3.
Optical and Electrical Properties of Li-Doped ZnO Thin Films by the Pulsed Laser Deposition
최병춘,전병억,김유성,문병기,정중현,Haeyoung Choi,김정환,이성수,배종성 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.3
We studied the effects of Li incorporation on the physical properties of ZnO thin films, which is comparable to native defects in the ZnO. The Li-doped ZnO (ZnO:Li) thin films were grown on Al(0001) substrates by using the pulsed laser deposition method. The targets employed were high-purity ZnO ceramics with different Li contents: Li 0.05 at.%, Li2O 0.05 mol% and Li 0.10 at.%. We observed that the optical and the electrical properties of the ZnO:Li thin films depended on the Li concentration. The crystalline qualities and the surface morphologies of the thin films were studied by using X-ray diffraction and scanning probe microscope image. The thicknesses of the ZnO:Li thin films were estimated by using the interference patterns of the optical transmittance data. In order to investigate the potential transparent conductive applications of the ZnO:Li thin films, we discuss the photoluminescence and the Hall conductivity. Consequently, ZnO:Li thin lms are expected to be almost epitaxially grown on Al2O3 (0001) substrate and exhibits n-type conductivity at room temperature.
崔炳春,林海正 群山大學校 1997 論文集 Vol.24 No.-
This paper concerning the case study on claims happened by inherent flaw of the insured cargo from a commercial science standpoint by raising the question as follows : First, should it be adjusted on loss in applying warranty condition suitable to all sort of the insured cargo risk? Second, should the Loss Adjustment and Recovery regarding the insurance claims be executed properly on the basis of well-grounded legal items and should laws and regulations be definitely? Third, what is incidental problems caused by the settlement of items to the exclusion of pertinent and valid precedent which has been applicable customary for the purpose of persisting in indefinite legal items which do not fit in with the reality in time of raising a claim? Therefore this paper exemplified well-grounded precedent on the kinds inherent flaw of the insured cargo, suggested the notable items of the Loss Adjustment and Recovering on the basis of the cause for claim, the legal basis for decision of the court, the analysis of precedent and the problems and the corresponding device in analyzing each precedent.
최병춘(Choi Byeong-Choon) 한국인터넷전자상거래학회 2001 인터넷전자상거래연구 Vol.1 No.1
The cyber trade infra in korea have many problems such as a distributed service, a reduplicated investment, and the dullness of coefficient of utilization, and the like, not only in insufficiency of an indispensable infra such as an electronic settlement system and a certified system, and such like, but also in the established infra such as a trade information network, a trading agential site, and a trade automatic network.<br/> Under this environment, in case the cyber trade should not be got firmly fixed as being delayed the people, the government, and aggregate power in improving of cyber trade infra, it is expected that the cyber trade in korea will not survive in a 21c trade war characterized by cost-cutting and technological innovation.<br/> Now cyber trade isn't a choice anymore it is a requirement. To accelerate the arrangement of the law for enhancing the adaptability of companies on cyber trade situation, institutional infra, information infra, a research and development infra, and human resources infra will be preparatory particulars and an effective countermeasure suited to the current trade environment and course in the pursuit of total cyber trade.