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Physical Properties of Ultra - High Molecular Weight Polyethylene in Retrieved Artificial Knee Joint
Jho, Jae Young,Bae, Dae Kyung,Shin, Hyo Seop,Lee, Choon Soo,Choi, Kui Won 한국공업화학회 2000 Journal of Industrial and Engineering Chemistry Vol.6 No.6
Physical properties of ultra-high molecular weight polyethylene (UHMWPE) in retrieved artificial knee joints were investigated. Lamella thickness, crystallinity, and mechanical chain scission appeared to increase during service. Crystallinity-depth profile was related to the conformity of joint and the thickness of tibial component. For the joint of low conformity, stress, crystallinity, and lamellae alignment were highest at subsurface 1-2 ㎜ beneath the surface, where crack propagation and delamination eventually occurred. It was suggested that the thickness and conformity of UHMWPE part should be increased for better wear-resistant tibial component of knee joint prosthesis.
On the intersection of $k$-Fibonacci and Pell numbers
Jhon J. Bravo,Carlos A. Gomez,Jose L. Herrera 대한수학회 2019 대한수학회보 Vol.56 No.2
In this paper, by using the lower bound of linear forms in logarithms of Matveev and the theory of continued fractions by means of a variation of a result of Dujella and Peth\H o, we find all generalized Fibonacci numbers which are Pell numbers. This paper continues a previous work that searched for Pell numbers in the Fibonacci sequence.
The Social Studies Curriculum in Korea : Characteristics, Issues, and Prospects
Jho, Daehoon 이화여자대학교 교과교육연구소 2017 교과교육학연구 Vol.21 No.3
The main purpose of this study is to analyze the history and characteristics of the national social studies curriculum in Korea, with a special focus on the 2015 Revised Social Studies Curriculum. Based on the introduction of the current framework of social studies curriculum and a brief chronological outline of the national curriculum revision over the past 60 years, this study illustrated key features of the 2015 Revised Social Studies Curriculum. In sum, looking at the contemporary history of national curriculum revision, the social studies curriculum was characterized by ‘instability’ due to the lack of a long-term view in curriculum design, and due to a strong tendency to separate instead of integrate subject matter across its major content areas. The analysis of 2015 Revised Social Studies Curriculum demonstrates that the 2015 revision is differentiated from the previous versions in terms of 1) the integrative approach to the core courses, 2) an increased emphases on the themes of multiculturalism and global awareness, and 3) the special attention given to education for ‘territory’ and ‘financial literacy.’ Finally, three persistent issues underlying Korea's social studies curriculum--namely, strong state control over the curriculum, detrimental effects of the micro-politics of social studies subjects, and the gap between national curriculum and teacher preparation—were discussed in relation to its future direction.
Solution Viscosity of Polar Perfluoropolyether Lubricants
Jhon, Myung S.,Izumisawa, Satoru,Choi, Hyoung Jin 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.5
It is commonly known that the roughness and uniformity of the perfluoropolyether (PFPE) thin lubricant films depend on the solvent used. To determine this solvent effect during the dip-coating process, we examined the viscosity for dilute PFPE solutions, which depends on aspect ratio and interacting potential among PFPE molecules. We found that the intrinsic viscosity, or Huggins' coefficient, measured in the early stage of manufacturing steps, is related to the film morphology, or media noise.
Strong-Coupling Electrostatics in the Presence of Dielectric Inhomogeneities
Jho, Y. S.,Kanduč,, M.,Naji, A.,Podgornik, R.,Kim, M. W.,Pincus, P. A. American Physical Society 2008 Physical review letters Vol.101 No.18
<P>We study the strong-coupling (SC) interaction between two like-charged membranes of finite thickness embedded in a medium of higher dielectric constant. A generalized SC theory is applied along with extensive Monte Carlo simulations to study the image charge effects induced by multiple dielectric discontinuities in this system. These effects lead to strong counterion crowding in the central region of the intersurface space upon increasing the solvent-membrane dielectric mismatch and change the membrane interactions from attractive to repulsive at small separations. These features agree quantitatively with the SC theory at elevated couplings or dielectric mismatch where the correlation hole around counterions is larger than the thickness of the central counterion layer.</P>
A Calculation for the Viscosity of Fluids by Using Van Der Waals Equation of State
Jhon, Mu Shik,Chair, Tong Seek,Pak, Hyung Suk,Kim, Won Soo 한국화학공학회 1989 NICE Vol.7 No.3
A new equation for the viscosity of fluid is presented by considering that the viscosity is equal to the product of the shear pressure and the shear relaxation time. The shear pressure and the shear relaxation time are calculated thermodynamically by applying the van der Waals model for fluids. The calculated viscosities for various simple substances are in good agreements with those of the observed values through liquid-critical point-gas region.
Pulse-amplitude equalization using a polarization-maintaining laser resonator.
Jhon, Young Min,Byun, Young Tae,Woo, Deok Ha Optical Society of America 2006 Optics letters Vol.31 No.18
<P>For the first time to our knowledge, pulse-amplitude equalization of rational-harmonically mode-locked fiber ring laser pulses has been experimentally demonstrated using a polarization-maintaining laser resonator without any additional device. The pulse-amplitude distribution of the laser pulses was controlled by the modulator driving power, and stable pulse-amplitude-equalized pulses with repetition rates of 20, 30, and 40 GHz have been obtained in the linear region of the modulator.</P>
Jhong-Kyu Leeh,Sung-Sang Yoo APEC국제교육협력원 2013 Asia-Pacific Cybereducation Journal Vol.9 No.2
This study aims to examine the Bologna Process in the reform of European higher education over the past decade. The year 2010 saw the completion of the European Higher Education Area (EHEA) since the Bologna Process has been adopted, European higher education has expanded both quantitatively and qualitatively with full participation of European countries and the position of higher education in Europe elevated to a central position in the development and promotion of the competitiveness of European countries. While integration, quality assurance, lifelong learning and student mobility are considered to be its main achievements, the socioeconomic situation among the member countries hinders the Bologna Process from successful implementation. As a result, four questions in regards to the Bologna Process are asked. These are whether ‘soft-law governance’ is working, whether there is an ‘unchallenged consensus,’ whether a ‘brain-drain or brain circulation’ is occurring, and whether it is an example of ‘educational innovation.’ In conclusion, bottom-up governance and open coordination among various groups in higher education will create an agenda for a higher education motivating paradigm change toward student-based learning and education. As a result, the Bologna Process may be a ‘global teacher’ leading the change in higher education reform in European and non-European countries