백무현 화백의 Talk Toon

백무현 미래사목연구소 2012 사목정보 Vol.5 No.6

백무현 화백의 Talk Toon

백무현 미래사목연구소 2012 사목정보 Vol.5 No.5

백무현 화백의 Talk Toon

백무현 미래사목연구소 2012 사목정보 Vol.5 No.1

가토의 지연피판과 확장피판의 혈류량과 생존범위에 관한 연구

백무현,이기룡,김승홍,민대홍 중앙대학교 의과대학 의과학연구소 1990 中央醫大誌 Vol.15 No.1

The tissue expansion technique, especially skin expansion, is now a well-accepted modality for treating reconstructive problems complicated by indequate skin and soft tissue. Cherry (1983) demonstrated that the survival length of radom pattern flaps raised in expanded skin is greater than that of flaps raised in unexpanded tissue and that expanded flaps have survival length similar to that of the delayed flap. The mechanism for this increased survival length may be due to physical forces associated with serial expansion acting as a stimulus for the angiogenesis on the flap and the capsule which has formed beneath the flap. The present study was undertaken to examine quantitatively the dynamic changes of capillary blood flow among the normal control flaps (group A), delayed flaps (group B), expanded flaps with capsulectomy (group C) and expanded flaps with intact capsules (group D), which were measured at intervals of 4cm from the base of each flap using the laser flowmetry in order to determine the relation between survival length of each random skin flap and capillary blood flow. This also determine the role of the capsule in blood flow and survival of expanded skin flaps. The results were as follows: 1. The survival length and the capillary blood flow of the flaps were increased in delayed and expanded skin flaps than control flaps. 2. The survival length and the capillary blood flow of the flaps were similar each other except normal control skin flaps. 3. The changes of capillary blood perfusion from pedicle to the distal end of the skin flap closely paralleled the survival length of the skin flaps. 4. The capsule did not contribute to the increase of the capillary blood flow and flap survival. We conclude the capsulectomy did not have a detrimental effect on the hemodynamics and viability of random pattern skin flaps raised on expanded skin. ,

투명산화철의 製造에 관한 硏究

백무현,임종호,김태경,이승원,Baek, Moo-Hyun,Lim, Jong-Ho,Kim, Tae-Kyung,Lee, Seoung-Won 한국자원리싸이클링학회 2004 資源 리싸이클링 Vol.13 No.6

The optimum conditions were studied for the preparation of transparent iron oxide with the air oxidation of FeOOH. The FeOOH obtained by mixing NaOH and FeSO$_4$ solution in various conditions such as R(=2NaOH/FeSO$_4$), FeSO$_4$ concentration. reaction temperature and air flow rate. When the FeSO$_4$ increased gradually, the concentration of iron ion in the solution became high. So, particle size increased precipitating Fe$_3O_4$. Goethite dehydrate at about 200$^{\circ}C$ and ended the reaction at about 320$^{\circ}C$ forming hematite. The lower the reaction temperature was, the shorter the particle length of goethite and particle size decreased. When the flow rate of air as an oxidant increased, the amount of dissolved oxygen in the solution increased, which made oxidation rate increased. And then particle size of goethite decreased. FeSO$_4$ 용액에 NaOH를 첨가하여 FeOOH를 제조하였으며, R(=2NaOH/FeSO$_4$), FeSO$_4$의 농도, 반응온도 및 산화용 가스인 air의 유량 변화에 따른 제조변수를 통해 투명산화철의 제조 조건을 연구하였다. 수용액 중에 FeSO$_4$의 농도가 증가할수록 Fe$_3O_4$를 석출하며 입자의 크기가 증가하였다. 생성된 FeOOH는 약 200$^{\circ}C$에서 탈수반응을 일으켜 약 320$^{\circ}C$부근에서 종료하였다. 반응온도가 낮을수록 Fe(OH)$_2$의 입자의 길이가 짧아졌으며, 산화제인 air의 공급량이 클수록 용액 중에 용존산소의 량이 증가하여 Fe(OH)$_2$의 입자길이가 감소하였다.

플랜옵틱 포인트 클라우드를 활용한 다시점 영상 부호화 방안

백무현,문지원,이진규,이하현,강정원,황성수 대한전자공학회 2020 전자공학회논문지 Vol.57 No.6

In this paper, we propose a system to create a plenoptic point cloud from multi-view and depth images and efficiently encode multi-view images using plenoptic point cloud. Plenoptic Point Cloud is a set of plenoptic points. Plenoptic Point is an representation method that has single geometric information where 3D point is located and multiple color information obtained from multi-view images. With the recent increase in interest in immersive contents, the utilization of multi-view images has increased, and research on encoding is essential to efficiently deliver them. To solve this, this paper uses plenoptic point cloud to minimize the loss of color information, and performs cube and frustum-based voxelization. Then, to solve the problem of geometric information distortion caused by voxelization, we propose a method to regenerate an image by projecting it in consideration of camera position. At the same time, similarity analysis between planoptic points is performed to verify whether this paper proposed an expression method advantageous for encoding. Experiment results showed that the average PSNR of images generated by creating a plenoptic point cloud using incremental generation method for all datasets and voxelizing them into frustum with a resolution of 4096 were 50.7dB. In addition, high similarities between plenoptic points of similar positions leads to an advantage in compression and encoding. 본 논문에서는 다시점 영상과 깊이 영상으로 플랜옵틱 포인트 클라우드를 만들고 이를 활용하여 다시점 영상을 효율적으로 부호화하는 시스템을 제안한다. 플랜옵틱 포인트 클라우드란 플랜옵틱 포인트의 집합이다. 플랜옵틱 포인트는 하나의 3차원 점이 위치하는 기하정보와 다시점 영상으로부터 획득한 다수의 색상 정보를 가지는 표현 방법을 의미한다. 최근 실감 영상에 대한 관심이 높아짐에 따라 다시점 영상의 활용도가 증가하였고 이를 효율적으로 전달하기 위해서는 영상 부호화에 대한 연구가 필수적이다. 이를 위해, 본 논문에서는 플랜옵틱 포인트 클라우드를 활용하여 색상정보의 손실을 최소화하고, 육면체와 입체사다리꼴 기반 복셀화를 수행한다. 이후 복셀화로 인한 기하정보 왜곡문제를 해결하기 위해 카메라 위치정보를 고려하여 투영하는 방식으로 영상을 다시 생성해내는 방법을 제시한다. 동시에 본 연구가 부호화에 유리한 표현 방법을 사용하였는지 여부를 검증하기 위하여 플랜옵틱 포인트 간 유사도 분석을 수행하였다. 실험결과 모든 데이터셋에 대해 순차적 생성방법으로 플랜옵틱 포인트 클라우드를 생성하고, 해상도가 4096인 입체 사다리꼴 형태로 복셀화 하여 생성한 영상의 평균 PSNR이 50.7dB가 나온 결과를 확인할 수 있었다. 또한 유사도 분석 결과 비슷한 위치의 플랜옵틱 포인트 간에 높은 유사도가 나옴에 따라 부호화에 유리한 결과를 기대할 수 있었다.

Correction of Short Nose Deformity Using a Septal Extension Graft Combined with a Derotation Graft

백무현,Lo Shui Chu 대한성형외과학회 2014 Archives of Plastic Surgery Vol.41 No.1

In patients having a short nose with a short septal length and/or severe columellar retraction, a septal extension graft is a good solution, as it allows the dome to move caudally and pushesdown the columellar base. Fixing the medial crura of the alar cartilages to a septal extension graft leads to an uncomfortably rigid nasal tip and columella, and results in unnatural facial animation. Further, because of the relatively small and weak septal cartilage in the East Asianpopulation, undercorrection of a short nose is not uncommon. To overcome these shortcomings, we have used the septal extension graft combined with a derotation graft. Among 113 patientswho underwent the combined procedure, 82 patients had a short nose deformity alone; the remaining 31 patients had a short nose with columellar retraction. Thirty-two patients complained of nasal tip stiffness caused by a septal extension graft from previous operations. In addition to the septal extension graft, a derotation graft was used for bridging the gap between the alar cartilages and the septal extension graft for tip lengthening. Satisfactory results were obtained in 102 (90%) patients. Eleven (10%) patients required revision surgery. This combination method is a good surgical option for patients who have a short nose with small septal cartilages and do not have sufficient cartilage for tip lengthening by using a septal extension graft alone. It can also overcome the postoperative nasal tip rigidity of a septal extension graft.

특징점과 특징선을 활용한 단안 카메라 SLAM에서의 지도 병합 방법

백무현,이진규,문지원,황성수 한국멀티미디어학회 2020 멀티미디어학회논문지 Vol.23 No.2

In this paper, we propose a map alignment method for maps generated by point-line monocular SLAM. In the proposed method, the information of feature lines as well as feature points extracted from multiple maps are fused into a single map. To this end, the proposed method first searches for similar areas between maps via Bag-of-Words-based image matching. Thereafter, it calculates the similarity transformation between the maps in the corresponding areas to align the maps. Finally, we merge the overlapped information of multiple maps into a single map by removing duplicate information from similar areas. Experimental results show that maps created by different users are combined into a single map, and the accuracy of the fused map is similar with the one generated by a single user. We expect that the proposed method can be utilized for fast imagery map generation.

韓國海洋文學의 方向에 對한 硏究 : 小設을 中心으로

白武鉉 전주대학교 국어국문학회 1986 母岳語文學 Vol.1 No.-

Study on the relationship of structure and gloss of PP/HDPE multicomponent system blending

백무현,김남희,김정진,인교진 한국고분자학회 2007 한국고분자학회 학술대회 연구논문 초록집 Vol.2007 No.4