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M-Doped TiO<sub>2</sub> (M=Co, Cr, Fe)의 제조 : 전자 밴드구조-(1)
배상원,김현규,지상민,장점석,정의덕,홍석준,이재성,Bae, Sang-Won,Kim, Hyun-Gyu,Ji, Sang-Min,Jang, Jum-Suk,Jeong, Euh-Duck,Hong, Suk-Joon,Lee, Jae-Sung 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.1
The electronic band structures of Metal-doped titanium dioxide, M-doped $TiO_2$ (M=Co, Cr, Fe), have been studied by using XRD, UV-vis diffuse reflectance spectrometer and FP-LAPW (Full-Potential Linearized Augmented-Plane-Wave) method. The UV-vis of M-doped $TiO_2$ (M=Co, Cr, Fe) showed two absorption edges; the main edge due to the titanium dioxide at 387 nm and a shoulder due to the doped metals at around 560 nm. The band gap energies of Co, Cr and Fe-doped $TiO_2$ calculated by FP-LAPW method were 2.6, 2.0, and 2.5 eV, respectively. The theoretically calculated band gap energy of $TiO_2$ by using FP-LAPW method was the same as experimental results. FP-LAPW method will be useful for fabrication and development of photo catalysts working under visible light.
모든 색을 커버하는 최소 두께 직사각형 고리를 계산하는 알고리즘
배상원(Sang Won Bae) Korean Institute of Information Scientists and Eng 2017 정보과학회논문지 Vol.44 No.3
In this paper, we present an algorithm that computes a minimum-width color spanning axis-parallel rectangular annulus. A rectangular annulus is a closed region between a rectangle and its offset, and it is thus bounded by two rectangles called its outer and inner rectangles. The width of a rectangular annulus is determined by the distance between its outer and inner rectangles. Given n points in the plane each of which has one of the prescribed k colors, we call a rectangular annulus color spanning if it contains at least one point for each of the k colors. Prior to this work, there was no known exact algorithm that computes a minimum-width color-spanning rectangular annulus. Our algorithm is the first to solve this problem and it runs efficiently in O(n-k)³nlogn) time.
천연경신에 (天然更新) 의한 소나무 유령임분의 (幼齡林分) 구조와 무육방법 (撫育方法)
배상원 ( Sang Won Bae ) 한국산림과학회 1994 한국산림과학회지 Vol.83 No.1
This study is performed to consider the fitness of natural regenerating method and tending methods used now by surveying the stand structure and regenerating states of the 9 natural regenerated Pinus densiflora stands in Kangwon province. As a special consideration, it deals with the tending methods on the seedlings of Pinus densiflora and broad-leaved tree(Quercus mongolica) under competition. By the consideration on the number of trees, growing capacity and stand structures of Pinus densiflora stands, it reveals that Pinus densiflora is in the inferior in numbers at the competition to the broad-leaved species, and it could not occupy the stands as the dominant species if the stands were not tended. It is estimated that natural regeneration of Pinus densiflora stands by the clearcutting or seed tree system could not achieved due to the abundance of ground vegetation. Short-term shelter-wood system or strip stand method may be proposed as a successful method of natural regeneration. As the visible tending method for seedlings, the method which apply the mixed forest in group of Pinus densjlora and Querczes mongolica different by the growing capacity and distribution characteristics is better thaw the one which tend the Pinus densiflora only.
배상원(Sang Won Bae),좌경룡(Kyung-Yong Chwa) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
본 논문에서는 유클리드 평면상에 도로망이 주어져 있어서 여행자들이 그 도로들을 이용하여 더욱 빠르게 이동할 수 있는 경우를 가정한다. 이 때, 두 점 사이의 거리는 기하학적 직선거리가 아닌 주어진 도로들을 이용하여 두 점 사이를 이동할 때 필요한 최소시간으로 측정한다. 본 논문에서는 이러한 새로운 거리 척도를 고려할 때에 보로노이 다이어그램이 어떤 특성을 갖는가를 연구하며 그것을 이용하여 보로노이 다이어그램을 효율적으로 계산하는 알고리즘을 제시한다. 이 알고리즘은 O(nm²logn+m³logm)의 시간과 O(m(n+m))의 공간을 필요로 한다. 이 때, n은 주어진 싸이트의 개수이고 m은 주어진 도로의 개수이다.
Tensiomyography를 이용한 근육손상의 평가 및 적용
배상원 ( Sang Won Bae ),채정훈 ( Jung Hoon Chai ),김보경 ( Bo Kyeong Kim ),김철현 ( Chul Hyun Kim ),김찬 ( Chan Kim ) 대한스포츠의학회 2015 대한스포츠의학회지 Vol.33 No.2
Tensiomyography (TMG) is known as non-invasive method which assesses the muscular characteristics such as contraction velocity or maximal displacement of the belly. The aim of this study was to evaluate muscular responses by TMG after muscle injury and to introduce using TMG first in Korea. This study was performed with a subject who was diagnosed with muscular injury and consent measuring and following up TMG analyses. A female patient, who was diagnosed left hip adductor muscle strain, underwent magnetic resonance imaging (MRI) and TMG at intervals of two weeks. We obtained decreased in displace maximum (Dm, 4.14 vs. 5.69) and altered curve shape in the injured muscle at the initial TMG assessment in comparison to the non-injured side. After two weeks, MRI findings and symptom were improved and Dm in the injured side increased as in the non-injured muscle. These findings suggest that a decrease in Dm indicate increased in muscle stiffness after muscle injury, and an increase in Dm as in the non-injured side after two weeks indicate recovered status. TMG may be useful as a simple and non-invasive device for monitoring muscle function after muscle injury and during the recovery.
배상원(Sang Won Bae),이춘석(Chunseok Lee),최성희(Sunghee Choi) 한국정보과학회 2009 한국정보과학회 학술발표논문집 Vol.36 No.1
본 논문에서는 병목 스타이너 트리의 정확한 해를 구하는 알고리즘을 다룬다. 병목 스타이너 트리 문제는 스타이너 트리중 가장 긴 간선의 길이가 최소화된 것을 구하는 문제이다. 이 문제는 √2이하의 근사율로 해를 구하는 것이 NP-Hard 임이 이미 증명되었다. 따라서 본 논문에서는 O(f(k) · n<SUP>k</SUP> log n)시간에 정확한 해를 구하는 알고리즘을 제시한다. 여기서 n,k는 각각 주어진 점과 스타이너 점의 개수를 나타내며, f(k)는 k에만 관한 함수이다. 현재까지 이 문제에 대해서는 정확한 해를 구하는 알고리즘이 알려지지 않았고, 본 논문에서 처음으로 정확한 알고리즘을 제시한다.