Current-Induced Resonant Motion of a Magnetic Vortex Core: Effect of Nonadiabatic Spin Torque

The current-induced resonant excitation of a magnetic vortex core is investigated by means of analytical and micromagnetic calculations. We find that the radius and the phase shift of the resonant motion are not correctly described by the analytical equations because of the dynamic distortion of a vortex core. In contrast, the initial tilting angle of a vortex core is free from the distortion and determined by the nonadiabaticity of the spin torque. It is insensitive to experimentally uncontrollable current-induced in-plane Oersted field. We propose that a time-resolved imaging of the very initial trajectory of a core is essential to experimentally estimate the nonadiabaticity.Comment: 4 pages, 4 figure

The encounter of East Asia with Western civilization in the 19th century: translation as a means of communication

This study examines how three East Asian countries - Korea, China, and Japan overcome and translated heterogeneities into a means of communication with Western civilization. Simultaneously, discussions on ways of translation were also examined to compare the stances of each country that accepted Western civilization. The governments of the 3 East Asian countries have commonly encouraged the translation works along with openness to Western civilization in the 19th century. Translation has usually been exploited as a means to rule colonized countries. However, the three countries have spontaneously encouraged translation, suggestive of the need to find alternate approaches to conventional ways in the study of translations in the post-colonial era. In the past, the three countries shared common Chinese characters that facilitated mutual communication. However, their point of view on communication with foreign countries differed. Japan has initiated the translation of the works of Western civilization since 16th century, thus gaining experience in the importance of mutual communication with foreign civilizations. Accordingly, the level of translation and the resultant culture have evolved more than in other countries. China likewise has a long history of translation, but most works of translation were conducted by people of Western origin. In Korea, despite the significant career in the operation of national translational-training school, the public recognition of translation and translators has been relatively negative. This poor acceptance of translation and translators might be the consequence of different results from communication mediated through Korean translation in the 19th century

Transversality and Comparative Political Philosophy in the Age of Globalization

Taking a cue from Ralph Waldo Emerson, who is widely known as “the first American public intellectual,” this essay is an attempt to define the critical function of comparative political philosophy in today’s world of multiculturalism in the era of globalization which is in dire need of dialogue on a global scale. In the first place, Western modernity has overlooked and marginalized the non-West, the phenomenon of which is called Eurocentrism. All ethnocentrisms, including Eurocentrism, are myopic and have no place in the globalizing world of multiculturalism. This essay proposes that Eurocentric universality be replaced by transversality which is consonant with the multiple realities of the changing world. Transversality as a global imaginary allows all kinds of border-crossing and thus blurs traditional disciplinary genres. Thus it is at once intercultural, interspeciesistic, and interdisciplinary. In the second place, the role of comparative political philosophy radically shifts from the individualistic and anthropocentric tradition of “rights talk” to the ethics of responsibility based on the primacy of alterity. If, according to Levinas, ethics is “first philosophy,” then responsibility becomes “first ethics.

Ray class invariants over imaginary quadratic fields

Let $K$ be an imaginary quadratic field of discriminant less than or equal to -7 and $K_{(N)}$ be its ray class field modulo $N$ for an integer $N$ greater than 1. We prove that singular values of certain Siegel functions generate $K_{(N)}$ over $K$ by extending the idea of our previous work. These generators are not only the simplest ones conjectured by Schertz, but also quite useful in the matter of computation of class polynomials. We indeed give an algorithm to find all conjugates of such generators by virtue of Gee and Stevenhagen

Digital sketchpad: A Portable scetching device

The thesis discusses the problems of sketching on paper and in using existing products that are currently on the market for hand drawing. A new display technology, electronic paper display, is introduce