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오정현 역사교육학회 2011 역사교육논집 Vol.46 No.-
The purpose of this study is to find out how much the items of the test reflected the spirit of the Japan occupation times, exploitation and resistance. It is found that the items had content validity showing the appropriateness of attaining the goals, importance of the facts, and developing thinking skills. Students tend to simply memorize the facts frequently covered in the test,which can lead to the fixed and shallow historical image to them. Students also showed difficulties in the test items dealing with particular chapters,the questions without pictures, and the items of unfamiliar historical facts,or having attractive wrong answers. In order for the test items to help students to understand history, two things should be considered when making questions. First, when selecting question materials, we should try to include proper amount of the facts,for students not to distort historical facts with narrow interpretation. Also it is recommended to choose rather complicated materials to improve their thinking skills. Second, thinking of the item frequency, we should not lean too much towards particular chapters or periods, because it can give students the biased historical image who think the more frequent the items, the more important. The history about Japan occupation should be covered with rational judgment rather than emotional approach and the test should also include value and attitude evaluation. Thus, it is suggested that supplemented tests, such as essay tests and performance tests, should be applied in the test, besides multiple choice tests.
오정현,안도열,J. S. Hwang,손맹호,황성우 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6
The time-dependent responses of a single-electron transistor are investigated theoretically by adopting the Green's function approach. Since the formalism takes non-adiabatic effects of the time-dependent perturbation into account, as well as the many-body interaction, the calculated results provide full expressions for the tunneling current and the noise. For typical experimental parameters, we calculate the first-harmonic responses of the single-electron transistor and discuss static voltage effects on the tunneling current and the noise in a radio-frequency single-electron transistor.
Klein Tunnelling Through an Oblique Barrier in Graphene Ribbons
오정현,D. Ahn 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.4
We study the transmission coefficient of graphene nanoribbons with a top gate that acts as an oblique barrier. Using a Green's function method for the the Dirac-like equation, we take into account scattering among transverse modes due to the oblique barrier numerically. In contrast to the two-dimensional graphene sheet, the transmission pattern of graphene ribbons depends strongly on the electronic structure in the barrier region. Consequently, irregular structures in the transmission coe±cient are predicted while perfect transmission independent of the angle and the length of the oblique barriers is still calculated in the case of metallic graphene.