삭골(Bone shaving)한 골의 재생에 골막이 미치는 영향

강진성,권건영,송중원,오석희,한기환 大韓成形外科學會 1989 Archives of Plastic Surgery Vol.16 No.5

Many orientals have a more prominent malar eminence and mandibular angle than westerners so their faces often look rough and unattracive. In recent years more people want to have a more attractive and beautiful face due to economic prosperity and westernization. Therefore people receiving bone shavings or osteotomies for cosmetic purposes are increasing. The effects of the periosteum on lay bone grafts were investigated but the effect of the periosteum after bone shaving or osteotomy is little known. The authors investigated the effect of the periosteum on the regeneration of bone in membranous and endochondral bone of rabbits. Bony defects each measuring about 5.0×5.0×1.5mm were made on the left and right sides of the parietal bones of 15 rabbits and femurs of 15 other rabbits respectively. The periosteum was preserved on the left and removed on the right. The following results were obtained: 1) The average thickness of the regenerated bones in groups 2 δ4 were thinner than those in groups 1 δ 3 at 4, 8 and 12 weeks postoperatively but the differences of thickness were statistically significant at onl 4weeks postoperatively(P<0.05). 2) The histological findings in groups 2 δ 4 showed lesser regeneration of the shaved bone than those in groups 1 δ 3 at 4, 8 and 12weeks postoperatively. 3) There was no significant increase in the thickness of the regenerated bone after 8 weeks postoperatively in all groups. 4) At 12 weeks postoperatively, the thickness of the regenerated bone in all groups was over 70% of the thickness of the resected bone. In summary, the authors found that it is important to perform overcorrection and resect the periosteum simultaneously in bone shaving to prevent the unwanted regeneration.

AN EXPANSION OF THE PHONG-BLINN LIGHT MODEL FOR CLEARNESS OF SHADOWED AREAS

Geon-Hwan Kwon,Hong-Jae Kim,Kyoun-Jong Park,Tae-Yun Kim,Torsten Jarkrans,Heung-Kook Choi 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-

In the side of visual, a shadowed area is one of the most important factors for understanding an object of the three-dimensional space. When an object is rendered for visualization, the rasterization is performed by an operation of geometric factors. For its reality, we can express a three-dimensional effect of the divided object into two parts like a bright area and a dark area by adding a light model with operating geometrical factors. Of the widely used light models, The Phong-Blinn model is highly efficient and easily embodied. However, it did not well express when applying the bump mapping to the formed object with polygon. To solve above-mentioned problem, we study that how enhance visibility of the shadow area and quality about the object's space. For this purpose we propose the expanded Phong-Blinn model(EPB).

그림자 영역의 선명화를 위한 퐁-블린 조명 모델의 확장

권건환(Geon-Hwan Kwon),김홍재(Hong-Jae Kim),박경종(kyoung-jong Park),최흥국(Heong-Kook Choi) 한국멀티미디어학회 2006 한국멀티미디어학회 학술발표논문집 Vol.2006 No.1

시각적인 측면에서 3차원 공간상의 물체(객체)등을 이해하는데 중요한 요소 중 하나가 그림자(shadow)영역이다. 컴퓨터 가시화(display)를 통한 객체의 랜더링시 객체의 기하학적 요조들의 연산을 통해 래스터화가 이루어지는데, 사실적인 표현을 위해 기하학적 요조들의 연산시 조명 모델을 주가함으로써 물체의 밝은 영역과 어두운 영역을 구분하여 객체의 입체감을 추가할 수가 있다. 널리 사용하는 조명모델 중 성능이 좋고 구현이 쉬운 퐁-블린(phong-Blinn) 조명모델이 있으나 폴리곤으로 형성된 객체에 범프맵핑을 적용할 경우 배면에 잘 나타나지 않는 단점이 있다. 본 논문에서는 상기 문제점을 해결하고자 폴-블린 조명모델을 확장한 EPB(Expansion Phong-Blinn) 조명 모델을 제안하여 그림자 영역의 선명도를 높여 공간상의 객체에 대한 시각성의 질적 향상 표면을 연구하고자 한다.

Influence of Host Plant Feeding on the Prey Consumption of Nesidiocoris tenuis (Heteroptera : Miridae)

Man-Young Choi,Jeong-Hwan Kim,Geon-Hwi Lee,Chae-Hoon Paik,Tae-Hwan Noh,Hyeong-Kwon Shim 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.05

This study was carried out to know whether the host plant feeding have an influence to subsequent prey consumption of a zoophytophagous mirid, Nesidiocoris tenuis, with biological control potential. Piece of leave of Paprika, Sesame, and cotton ball soaked with water were respectively provided to the test insects, adult mirid starved about a day, and frozen eggs of Ephestia kuehniella, were presented to them for a day and counted the number of the eggs consumed by them. The mirid fed by Sesame leave took significantly less prey than both the Paprika and the water fed one.

Occurrence and Developmental Characteristics of Maize Weevil

Geon-Hwi Lee,Chae-Hoon Paik,Tae-Hwan Noh,Hyeong-Kwon Shim 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05

We have gathered rice grain and bran from conventional mills and RPC(Rice Processing Complex) for the survey of stored grain insect pests. Maize weevil(Sittophilus zeamais) is the dominant species among the stored grain insect pests of the rice grain and bran. Under three constant temperatures, 15, 20 and 25℃, developmental periods from egg to adult were 43.0, 37.5 and 29.2 days, respectively. With egg periods being 9.6, 7.3 and 5.2days, and larval periods being 25.2, 21.8 and 19.8days, and adult periods being 126.1, 110.3 and 108.6days, respectively. The adults of Maize weevil feed basically on the same the foods as the larvae but not as restricted in their diets because the larvae need to develop inside whole grains. Feeding of S. zeamais adult usually began 3∼4 days after emergence at 25℃. Then adult feeding ca. one rice a day, reaching a peak of 20∼40days after emergence.

Population density of Insect Pests and Natural enemies in the Rice Field

Geon-Hwi Lee,Chae-Hoon Paik,Tae-Hwan Noh,Hyeong-Kwon Shim 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05

Biological control of rice insect pest is an important component of an IPM program. There are many species of natural enemies which contribute to the suppression of rice pest populations below economic injury levels. In order to use biological control more efficiently, it is a need to identify beneficial species and determine their roles in possible regulation of insect pests. There is a rich complex of biological control agents in rice and bund. This research was carried out to investigate the population density of insect pests and natural enemies in the rice field and bund. A total of 7 pest species and 15 natural enemy species were collected in the rice field. 10 pest species and 20 natural enemy species were collected in the bund, also. Changes in population density of insect pests and its prey were investigated in the rice field and bund. Population densities of insect pests were low at any time during the rice growth period in the field. This could be the high density of natural enemies. Bunds served as refuge for natural enemies when rice maturity. There are rich complex of biological control agents in rice field and bund. So, when we practice integrated pest management(IPM) of rice insect pests, we should use various natural enemies.

Characteristics of Bovine Teeth Whitening in Accordance with Gas Environments of Atmospheric Pressure Nonthermal Plasma Jet

Geon Bo Sim,Yong Hee Kim,Jae Sung Kwon,Daehoon Park,Seok Jun Hong,Young Seok Kim,Jae Lyun Lee,Gwang Jin Lee,Hwan Uk Lim,Kyung Nam Kim,Gye Dong Jung,Eun Ha Choi 한국진공학회 2014 한국진공학회 학술발표회초록집 Vol.2014 No.2

가토에서 골가루와 hydroxyapatite가루의 혼합에 의한 골이식

권건영,강진성,송중원,한기환,오재훈 大韓成形外科學會 1992 Archives of Plastic Surgery Vol.19 No.1

When bone grafts are used to reconstruct skeletal defects, autogenous bone graft has been the method of choice. Autogenous bone graft, however, has disadvantages of unpredictable longterm resorption and the added morbidity to the patient from the harvesting of bone. Because of these problems, synthetic inorganic ceramic biomaterial, hydroxyapatite, has been developed and made available for craniofacial reconstructive procedures. Hydroxyapatite is biocompatible, and does not stimulate a foreign body reaction, and demonstrates osseous union with bone ingrowth, osteoconduction, and has not been reported to resorb. The purpose of our study is to make a new bone : a mixture of bone & hydroxyapatite which is able to generate new bone formation by a number of mechanisms such as osteogenesis, osteoinduction and osteoconduction and is unresorbable by the characteristics of unresorbable hydroxyapatite. In 20 rabbits, four full thickness bony defects were created on the frontoparietal bone and they were treated in 4 different ways : Group Ⅰ: the bony defect was left without graft. Group Ⅱ: the bony defect was filled with bone dust. Group Ⅲ: the bony defect was filled with a mixture of bone dust and hydroxyapatite particles. Group Ⅳ: the bony defect was filled with hydroxyapatite particles. Specimens were retrieved at 4, 8, 12, and 24 weeks posttoperatively. They were carefully examined grossly and microscopically. The results at 24 weeks postoperatively are as follows. Volume percentage : Group Ⅱ 74.27±2.048%, Group Ⅲ 121.39±3.284%, Group Ⅳ 119.48±9.173%. Hardness : Group Ⅰ42.20±0.367%, Group Ⅱ 57.28±0.549%, Group Ⅲ 71.14±1.151%, Group Ⅳ 65.69±0.571% X-ray study : In group Ⅱ, central osteoporotic changes, on the contrary marginal osteosclerotic changes were noted. In groups Ⅲ and Ⅳ, nearly complete osteosclerotic changes were noted. Histologic findings : regenerations of the bone, such as the presence of osteoblast, lamination those in group Ⅲ and Ⅳ. In goup Ⅲ, regeneration of bone was found more than in group Ⅳ but bone resorptive change was found less than in group Ⅱ. A mixture of bone and hydroxyapatite induces more bone regeneration than hydroxyapatite but is less resorbable than bone. These results suggest that the combination of bone and hydroxyapatite can improve the unpredictable resorbability of the bone and add bone induction ability to the hydroxyapatite so it amy provide an excellent alternative to autogenous bone graft.

A Study on 3D File Format for Web-based Scientific Visualization

Geon-hee Lee,Jeong-hwan Nam,Hwa-seop Han,Soon-chul Kwon 국제문화기술진흥원 2019 International Journal of Advanced Culture Technolo Vol.7 No.1

The most commonly used 3D modeling file formats are OBJ (Wavefront file format specification) and STL (STereoLithography). Although they have a common point of view in 3D on the screen, detailed functions are different according to purpose of development. OBJ is the most commonly used 3D file format and STL is mainly used as 3D file format for 3D printing. However, in the field of Scientific Visualization, precise analysis is required. There is a difference in accuracy depending on the type of 3D file format. OBJ and STL are not suitable for delicate surface description because they form meshes in the form of triangular polygons. And if you increase the number of triangle polygons, it will be smoother, but the file size also increases exponentially and causes excessive CPU usage. In contrast, VTK provides a variety of polygon structures, including triangular polygons as well as rectangular polygons and cube polygons. Thus, delicate surface depiction is possible. Delicate surface rendering is possible and file size is not large. This paper describes the concept and structure of VTK. We also compared the load times and file sizes between VTK, STL, and OBJ in the Chrome browser. In addition, the difference in surface rendering ability between VTK, STL, and OBJ is intuitively viewed based on the screen in which each 3D file format is implemented under the same conditions. This study is expected to be helpful for efficient 3D file format for precise implementation of Web - based Scientific Visualization.

Ecological Characteristics and Damage of Maize Weevil and Indian Meal Moth

Geon-Hwi Lee,Chae-Hoon Paik,Man-Young Choi,Tae-Hwan Noh,Hyeong-Kwon Shim 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.05

Maize weevil (Sittophilus zeamais) and Indian meal moth (Plodia interpunctella) are the dominant species among the stored grain insect pests of the rice grain and bran. This experiment was conducted to investigate developmental characteristic and damages of S. zeamais and P. interpunctella on the rice. Under five constant temperatures, 15, 20, 25, 30 and 35℃, developmental periods from egg to adult of Sittophilus zeamais were 43.0, 36.4, 29.2, 20.8 and 16.3 days, respectively. With egg periods being 9.6, 7.3, 5.2, 3.2 and 2.6 days, and larval periods being 25.2, 22.6, 19.8, 14.5 and 11.3 days, and adult periods being 129.3, 116.1, 108.6, 89.2 and 73.3 days, respectively. Damages of S. zeamais adult at 15, 20, 25 and 30℃ were 67.2, 96.2, 134.0 and 174.5 for 24hr on the rice. Damages of P. interpunctella larval 15, 20, 25 and 30℃ were 56.2, 78.3, 109.4 and 138.7 for 24hr on the rice. The duration of maximum occurrence were June to August for S. zeamais, late May to early August for P. interpunctella.