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박수찬,김진철 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
The amphiphilic polymers poly(Vinyl pyrrolidone-co-Methyl methacrylate) (P(VP-co-MMA)) showing LCST behavior having different VP/MMA contents (95:5, 94:6, 92.5:7.5 (mol/mol)) were produced by a free radical polymerization. LCST behavior was confirmed by measuring the O.D (Optical density) value due to temperature change from 20°C to 50°C using a UV-Vis spectrophotometer. The surface tension with the hydrophilicity and hydrophobicity ratio of the copolymer was measured through a ring method. P(VP-co-MMA) micelle was prepared using a swelling method. The sphere of micelles was analyzed by transmission electron microscopy (TEM), the average and standard deviation of the micelle diameter were measured using an image analysis program. Release with time lapse at 23.5, 37, 45°C and the critical micelle concentration was evaluated by fluorescence spectroscopy using nile red as a probe.
High-precision Estimate of the Critical Exponents for the Directed Ising Universality Class
박수찬 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.3
With extensive Monte Carlo simulations, we present high-precision estimates of the critical exponents of branching annihilating random walks with two offspring, a prototypical model of the directed Ising universality class in one dimension. To estimate the exponents accurately, we propose a systematic method to find corrections to scaling whose leading behavior is supposed to take the form <i>t</i><sup>−χ</sup> in the long-time limit at the critical point. Our study shows that χ ∽ 0.75 for the number of particles in defect simulations and χ = 0.5 for other measured quantities, which should be compared with the widely used value of χ = 1. Using χ so obtained, we analyze the effective exponents to find that β/υ<sub>||</sub> = 0.2872(2), <i>z</i> = 1.7415(5), η = 0.0000(2), and accordingly, β/υ<sub>||</sub> = 0.5000(6). Our numerical results for β/υ<sub>┴</sub> and z are clearly different from the conjectured rational numbers β/υ<sub>┴</sub> = 2/7 ∽ 0.2857, <i>z</i> = 7 4 = 1.75 by Jensen [Phys. Rev. E, <b>50</b>, 3623 (1994)]. Our result for β/υ<sub>┴</sub>, however, is consistent with 1/2 , which is believed to be exact.
박수찬,박정만 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.4
We derive the mesoscopic Langevin equation for driven lattice gas systems from microscopic driven-lattice-gas dynamics by using the generating function method developed for hard-core boson systems. We show this mesoscopic Langevin equation to be equivalent to the phenomenological Langevin equation proposed by Janssen and Schmittmann and by Leung and Cardy. Thus, we suggest that the numerical data should be analyzed with the intrinsic anisotropy taken into account in order for the numerical analysis of the critical exponents to be consistent with the theoretical analysis.
박수찬 한국역사연구회 2017 역사와 현실 Vol.- No.106
What was generally considered as the most important part of the whole Civil Examination system in the early half of the Goryeo period was the Jesul-gwa exam, which was composed of many steps from Hyanggong-shi to Gukjagam- shi and then to Dongdang-shi, which was sometimes followed by another round called Bok-shi, in which the king would re-grade the performances of successful candidates and provide them with finalized ranks. These Bok-shi rounds were never held regularly, and only during the reigns of some kings. This Bok-shi round of Goryeo was called with various names. In the “Selection of Governmental official candidates” section(“Seon’geo-ji”) of Goryeosa it was called as Bok-shi, but in other records they were also called as either “Chin-shi” or “Eo-shi.” In personal anthologies or epitaph materials it was even called as ‘Jeon-shi,’ ‘Jeong-shi’ or ‘Yeomjeon-shi.’ In 977, the 2nd year of king Gyeongjong’s reign, a Chin-shi exam was held, in an attempt to (secure personnel who would) preserve accomplishments of earlier governmental reforms that had been conducted during king Gwangjong’s days. Then, Bok-shi was held for the first time in 983(2nd year of king Seongjong’s reign), and was also held in 994 and 995, within the parameters that had been established in the past few decades. Later, the frequency of these Bok-shi exams increased during the reign of king Hyeonjong. Through this Bok-shi exam, the kings were able to demonstrate that the institution itself was managed by the king and no one else. And apparently, they also wanted to raise the level of fairness of the exam, as well as the people’s trust in the practice itself. During the reigns of kings Deokjong and Jeongjong Bok-shi exams were never held, but coming into the reign of Munjong, they resumed. Munjong was quite a supporter of the Bok-shi practice and tried to use it as a vehicle that would reinforce his influence, as we can see from the frequency of these Bok- shi exams, as well as the initiation of a Bok-shi round in the presence of the Crown prince, during his reign. Later, in the reigns of kings Seonjong and Sukjong, not only Bok-shi exams but another practice called ‘Sungjang’ as well were used to secure a personal relationship between the king and the successful candidates. And in the reign of king Yejong, governmental seats were immediately offered to those successful candidates. Yet the kings were not always able to accomplish what they set out to do. The Goryeo society considered literary creations very important, and “governmental policy (in other words, the kings’ own very agendas)” never always remained as subjects for government-overseen civil exams. And to make matters worse, in some cases, successful passers of Bok-shi rounds never even considered that as an honor, diminishing the exam’s authority in the process. As a result, it lost its prior status and was no longer able to be held in the reign of king Injong, when the civil exam system itself was revised and renovated.