http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
In Search of Canadian Political Theory of Liberal Multiculturalism
Chansoo Cho 한국정치학회 2004 한국정치학회보 Vol.38 No.4
This essay reviews the ideas of the Canadian political philosopher Will Kymlicka on the cultural membership of minority groups within a society and assesses them against the larger literature of liberal political theory. Since the historic Brown decision in 1954 the need to protect minority rights has been widely accepted throughout liberal democracies. Protecting historically discriminated-against groups involved an active endorsement of group rights, which often clashed with the liberal principles of individual rights. Kymlicka provides an example of political philosophy that tries to grasp a moral link between liberalism and multiculturalism. How can we construct a liberal theory that accommodates cultural membership of minority groups without undermining universal individual rights? To this question Kymlicka answers by breaking away from an old distinction between individual and collective rights. I conclude that liberal multiculturalism suggested by Kymlicka also serves as a check against illiberal communitarianism.
Chansoo Lee,Youho Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
This study reassess safety margin of the current Peak Cladding Temperature (PCT) limit of dry storage in terms of hydrogen migration by predicting axial hydrogen diffusion throughout dry storage with respect to wet storage time and average burnup. Applying the hydride nucleation, growth, and dissolution model, an axial finite difference method code for thermal diffusion of hydrogen in zirconium alloy was developed and validated against past experiments. The developed model has been implemented in GIFT – a nuclear fuel analysis code developed by Seoul National University. Various discharge burnups and wet storage time relevant to spent fuel characteristics of Korea were simulated. The result shows that that the amount of hydrogen migrated towards the axial end during dry storage for reference PWR spent fuel is limited to ~50 wppm. This result demonstrates that the current PCT margin is sufficient in terms of hydrogen migration.
Chansoo Lee,Youho Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
Dry storage of nuclear fuel is compromised by threats to the cladding integrity, such as creep and hydride reorientation. To predict these phenomena, spent fuel simulation codes have been developed. In spent fuel simulation, temperature information is the most influential factor for creep and hydride formation. Traditional fuel simulation codes required a user-defined temperature history input which is given by separate thermal analysis. Moreover, geometric changes in nuclear fuel, such as creep, can alter the cask’s internal subchannels, thereby changing the thermal analysis. This necessitates the development of a coupled thermal and nuclear fuel analysis code. In this study, we integrated the 2D FDM nuclear fuel code GIFT developed at SNU with COBRA -SFS. Using this, we analyzed spent nuclear stored in TN-24P dry storage cask over several decades and identified conditions posing threats due to phenomena like creep and hydrogen reorientation, represented by the burnup and peak cladding temperature at the start of dry storage. We also investigated the safety zone of spent nuclear fuel based on burnup and wet storage duration using decay heat.
Injector tip wetting visualization under flash-boiling and non-flash boiling conditions
( Chansoo Park ),( Jinyoung Jung ),( Choongsik Bae ),( Heechang Oh ),( Juhun Lee ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
In spite of various research on the particulate matter emission reduction for the direct injection spark ignition engine, particulate number (PN) emission is still an unsolved challenge in automotive society. Among various reasons of PN emission, injector tip wetting by residual fuel after fuel injection is one of emerging issue because it is a main source of diffusion bum and injector tip fouling. In this study, mechanism of injector tip wetting under flash boiling and non-flash boiling condition was studied. In order to measure the quantity of wetted fuel on the surface of fuel injector, laser induced fluorescence (LIF) technique was used. The fluorescence signal was captured by an intensified CCD camera with long distance microscope. The excitation light source was 266 nm wave length Nd:YAG laser. Direct Mie-scattering image of injector step-hole and backlight image of near-hole spray were used to explain the mechanism of the phenomenon. For further study, the effect of injector nozzle outlet configuration on the injector tip wetting was explored with various fuel injectors which have various nozzle outlet configuration. In the result, step-hole showed negative effect on injector tip wetting. Especially, for the larger diameter step-hole case showed larger tip wetting area. Flash boiling conditions showed larger injector tip wetted area compared to that of non-flash boiling conditions. It was thought that higher near-nozzle spray angle was the reason of larger injector tip wetted area due to increased interaction of spray and step-hole outlet.
Accurate Circuit Model of Patterned Vertical Alignment (PVA) Liquid Crystal Displays
Chansoo Park,Youngmin Cho,Joon-Chul Goh,Chong Chul Chai,Seung-Woo Lee 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
We propose an accurate circuit model of patterned vertical alignment (PVA) liquid crystal (LC). The model adopts a first-order macro model described by Verilog-A. To improve accuracy of the transient response of PVA LCD panel, we propose T-V curve approximation method. We report a delay at the first frame of gray-to-gray transition, which results in large deviation. We achieve highly accurate simulation results by taking on account of the delay in PVA panel.