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PROTTER'S CONJUGATE BOUNDARY VALUE PROBLEMS FOR TWO DIMENSIONAL WAVE EQIATION
Jeon, Jong-Duek,Khe, Kan-Cher,Park, Ji-Hyun,Jeon, Yong-Hee,Park, Jong-Bae Korean Mathematical Society 1996 대한수학회지 Vol.33 No.4
In 1954 M. H. Protter [1] formulated the following boundary value problem as an analogue of the plane Darboux problem.
Wing Sum Cheung,Khe Foon Hew APEC국제교육협력원 2006 Asia-Pacific Cybereducation Journal Vol.2 No.2
In the last few years there has been a proliferation of asynchronous online discussion forums which have opened up the possibilities for people to exchange ideas at any place and at any time. The literature has documented that asynchronous online discussion has the following desirable characteristics: 1) it may help enhance the participation of students who might be less willing to participate in traditional face-to-face classroom settings due to shyness; and 2) it has the potential to encourage more thoughtful responses since participants can take their own time in composing their thoughts. Nonetheless, despite the promise of asynchronous online discussion to promote rich learning experiences, students do not always make use of its potential. The purpose of this study was to examine how a group of Singapore students interacted with one another, as well as the types of thinking skills, critical or creative thinking, and levels of information processing they exhibited during an asynchronous online discussion. This was an attempt to develop certain guidelines that would help facilitate students' in-depth thinking and promote student-to-student interaction in an online discussion environment.*
PROTTER'S CONJUGATE BOUNDARY VALUE PROBLEMS FOR THE TWO DIMENSIONAL WAVE EQUATION
Jeon, Jong Duek,Khe, Kan Cher,Park, Ji Hyun,Jeon, Yong Hee,Choi, Jong Bae 대한수학회 1996 대한수학회지 Vol.33 No.4
In 1954 M. H. Protter [1] formulated the following boundary value problem as an analogue of the plane Darboux problem. PROBLEM D_0. Find a solution u(x, y, r) of the equation (1) (∂^2/∂_x^2+∂^2/∂_y^2-∂^2/∂_r^2)u(x,y,r)=0 in the domain Q : 0 < r < p ≡ √x^2+y^2 < 1-r such that u ∈ C(Q)∩C^2(Q) and (2) u|K_i=ψ_i, i=0,1 where ψ_i, i=0,1 are given functions, the conic surface K_0 : 0 <p = r < 1/2 and the circle without the center K_1 : r =0, 0<p<1.
PVA Technology for High Performance LCD Monitors
Kim, Kyung-Hyun,Song, Jang-Geun,Park, Seung-Bam,Lyu, Jae-Jin,Souk, Jun-Hyung,Lee, Khe-Hyun The Korean Infomation Display Society 2000 Journal of information display Vol.1 No.1
We have developed a high performance vertical alignment TFT-LCD (Thin Film Transistor Liquid Crystal Display), that shows a high light transmittance, and wide viewing angle characteristics with an unusually high contrast ratio. In order to optimize the electro-optical properties we have studied the effect of cell parameters, multi-domain structure and retardation film compensation. With the optimized cell parameters and process conditions, we have achieved a 24" wide UXGA TFTLCD monitor (16:10 aspect ratio 1920X1200) showing a contrast ratio of over 500:1, panel transmittance near 4.5%, response time near 25 ms, and viewing angle higher than 80 degree in all directions.