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ON THE ORBIFOLD EULER CHARACTERISTIC OF LOG DEL PEZZO SURFACES OF RANK ONE
황동선 대한수학회 2014 대한수학회지 Vol.51 No.4
It is known that the orbifold Euler characteristic eorb(S) of a log del Pezzo surface S of rank one satisfies the inequality 0 ≤ eorb(S)≤ 3. In this note, we show that the orbifold Euler characteristic of S is strictly positive, i.e., 0 < eorb (S). Moreover, we also show, by construction, the existence of log del Pezzo surfaces of rank one with arbitrarily small orbifold Euler characteristic.
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Semicascades of toric log del Pezzo surfaces
황동선 대한수학회 2022 대한수학회보 Vol.59 No.1
A cascade of toric log del Pezzo surfaces of Picard number one was introduced as a language of classifying all such surfaces. In this paper, we introduce a generalized concept, a semicascade of toric log del Pezzo surfaces. As applications, we discuss K\"ahler--Einstein toric log del Pezzo surfaces and derive a bound on the Picard number in terms of the number of singular points, generalizing some results of Dais and Suyama.
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검도의 빠른 동작 머리치기와 후리기가 심박수 및 혈중 피로물질에 미치는 영향
조현철,황동선 龍仁大學校 武道硏究所 2003 武道硏究所誌 Vol.14 No.1
The purpose of the paper is to physiologically analyze what the result of long-term practice of Kumdo is and how Hu-ri-gi, exercising muscles used during Kumdo practice, influences on the metabolism of fatigue material. A comparison is conducted between skilled group and unskilled group for the changes of heart rate, lactate, and density of ammonia during two different types of recovering time; Rest recovery and Exercise Recovery, after practicing Ppa-run Dong-jak Meori-chi-gi. The target group of this experimentation is composed of twelve people who are members of The Kumdo Association of S city. Six among the sample group have practiced Kumdo for more than three years (skilled group) and the rest have less than six months of practicing period(unskilled group). The group participated in the experimentation taking two different types of recovery for 30 minutes after Ppa-run Dong-jak Meori-chi-gi. In the first method, Rest recovery, the group took a rest with comfortable position after the exercise. In the second method, Exercise recovery, the target group rested for fifteen minutes and practiced a hundred times of Hu-ri-gi in a regular speed, followed by the second rest in a comfortable position. In each time, blood-gathering was conducted during rest, when the exercise ended, after fifteen minutes of recovery, after 30 minutes of recovery. The result of this study are as follows; 1. Right after the exercise, heart-rate, lactate, and density of ammonia of the skilled group was lower in a meaningful degree compare to those of the unskilled group. 2. On the Rest recovery, heart-rate, lactate, and density of ammonia of the skilled group was lower than those of unskilled group. However, the meaningful difference was showed only in heart rate and the density of ammonia. 3. On the Exercise Recovery. heart-rate, lactate, and density of ammonia of the skilled group was considerably lower than those of unskilled group. 4. As a result of experimenting the two types of recovery, in both groups, heart rate, lactate and density of ammonia were lower in the second method, Exercise Recovery. However, the considerable difference was showed only in skilled group. In brief, a long-term Kumdo practice improves heart function, exercise capability, tolerance to the fatigue material Hu-ri-gi, an exercise recovery method which is comprehensively exercising muscles used during material Kumdo practice, is physiologically effective for eliminating fatigue material while recovery.
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