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매식체 주위 열개형 골 결손부의 골 재생시 흡수성 막과 비흡수성 막의 비교
권태훈,정진형,임성빈,Kwon, Tae-Hoon,Chung, Chin-Hyung,Yim, Sung-Bin 대한치주과학회 2000 Journal of Periodontal & Implant Science Vol.30 No.2
The purpose of this study was to examine the frequency of dehiscence bone defect on peri-implant and to compare the difference between resorbable membrane and nonresorbable membrane in bone regeneration on peri-implant. Amomg the patients, 22 patientswho have recieved an implant surgery at the department of Periodontics in Dankook University Dental Hospital showed implant exposure due to the dehiscence defect and 27 implants of these 22 patients were the target of the treatment. $Gore-Tex^{(R)}$ and $Bio-mesh^{(R)}$ were applied to the patients and treated them with antibiotics for five days both preoperatively and postoperatively. Reentry period was 26 weeks on average in maxilla and 14 weeks on average in mandible. The results were as follows : 1. Dehiscence bone defect frequently appeared in premolar in mandible and anterior teeth in maxilla respectively. 2. Among 27 cases, 2 membrane exposures were observed and in these two cases, regenerated area was decreased. 3. In non-resorbable membrane, bone surface area $9.25{\pm}4.84$ preoperatively and significantly increased to $11.48{\pm}7.52$ postoperatively.(P<0.05) 4. In resorbable membrane, bone surface area was $14.80{\pm}8.25$ preoperatively and meaningfully widened to $17.61{\pm}10.67$ postoperatively.(P<0.05) 5 . The increase of bone surface area in non-resorbable membrane was $2.23{\pm}3.38$ and the increase of bone surface area in resorbable membrane was $2.80{\pm}3.00$ ;therefore, there was no significant difference between these two membranes(P<0.05). This study implies that the surgical method using DFDB and membrane on peri-implant bone defect is effective in bone regeneration regardless the kind of the membrane, and a similar result was shown when a resorbable membrane was used.
심미 포스트가 전치에 미치는 응력과 변위에 관한 삼차원 유한요소법적 분석
권태훈,황정원,김성훈,신상완,Kwon Tae-Hoon,Hwang Jung-Won,Kim Sung-Hun,Shin Sang-Wan 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.5
Statement of problem : Most posts are metallic, but in response to the need for a post that possesses optical properties compatible with an all-ceramic crown. an esthetic post has been developed. Although there have been many studies about the esthetic post materials, 3-dimensional finite element studies about the stress distribution of them are in rare. Purpose : The purpose of this study is to investigate comparatively the distribution of stresses of the restored, endodontically treated maxillary incisors with the esthetic post materials and the displacement on the cement layer on simulated occlusal loading by using a 3-dimensional finite element analysis model. Material and method : Four 3-dimensional finite element models were constructed in a view of a maxillary central incisor, a post, a core, and the supporting tissues to investigate the stresses in various esthetic posts and cores and the displacement on the cement layer (Model 1 ; Cast gold post and core, Model 2 ; Glass fiber post with composite core, Model 3 ; Zirconia post with composite core. Model 4 ; Zirconia post with ceramic core). Force of 300N was applied to the incisal edge and the cingulum (centric stop point) with the angle of 135-degree to the long axis of the tooth. Results : 1. The stresses and displacement on the incisal edge were higher than on the cingulum 2. The stresses in dentin were the highest in Model 2 (Glass fiber post with composite core), and the second was Model 3, the third Model 1, and the lowest Model 4. 3. The stresses in post and core were the highest in Model 4 (Zirconia post with ceramic core), and the second was Model 1, the third Model 3, and the lowest Model 2. 4. The displacement on the cement layer was the highest in Model 2 (Glass fiber post with composite core), and the second was Model 3, the third Model 1, and the lowest Model 4. Conclusion : When a functional maximum bite force was applied, the distribution of stresses or the esthetic post and core materials and the displacement on the cement layer were a little different. It seems that restoring extensively damaged incisors with esthetic post and core materials would be decided according to the remaining tooth structure.
소방공무원에서 탄력성이 외상후스트레스 증상과 해리에 미치는 영향 : 우울의 매개 효과
권태훈,현소연,정영기,임기영,노재성,강대용,하귀염,김남희,Kwon, Tae Hoon,Hyun, So Yeon,Chung, Young Ki,Lim, Ki Young,Noh, Jae Sung,Kang, Dae Ryong,Ha, Gwiyeom,Kim, Nam Hee 한국정신신체의학회 2016 정신신체의학 Vol.24 No.1
연구목적 본 연구는 소방공무원에서 탄력성이 외상후스트레스 증상 및 해리에 미치는 영향과 함께, 탄력성과 각 외상후스트레스 증상 및 해리의 관계에서 우울의 매개효과에 대해서 알아보고자 하였다. 방 법 총 115명의 소방공무원을 대상으로, 생활사건 체크리스트, 사건충격척도-개정판, 해리경험척도, 벡 우울척도, 코너-데이비슨 탄력성 척도를 시행하였다. 탄력성이 외상후스트레스 증상과 해리에 미치는 영향 및 우울의 매개효과를 확인하기 위해 구조방정식모형(Structural equation modeling)과 경로분석(path analysis)을 실시하였다. 결 과 탄력성이 높을수록 낮은 외상후스트레스 증상과 낮은 해리를 보였으며, 각 탄력성과 외상후스트레스 증상 및 해리의 관계는 우울이 완전 매개를 하는 것으로 나타났다. 즉, 탄력성이 외상후스트레스 증상 및 해리에 대해 직접적인 영향이 아닌 우울을 통해 간접적으로 각 증상을 감소시킴을 보여주었다. 결 론 본 연구는 소방공무원에서 외상후스트레스 증상 및 해리의 예방과 치료에 있어 탄력성 강화와 우울 증상 감소를 목표로 한 임상적 개입이 중요함을 시사한다. Objectives : This study aimed to investigate the effects of resilience on posttraumatic stress symptoms and dissociation and whether depression mediates the relationships between resilience and posttraumatic stress symptoms and dissociation. Methods : A total of 115 firefighters participated in the study. Data were collected via the Life Events Checklist, Impact of Event Scale-Revised, Dissociative Experience Scale, Beck Depression Inventory, and Connor-Davidson Resilience Scale. Structural equation modeling and path analysis were applied to estimate the relationships between resilience, depression, posttraumatic stress symptoms, and dissociation. Results : Greater resilience was associated with lower posttraumatic stress symptoms and dissociation, and the relationship between them was fully mediated by depression. Conclusions : Specific aspects of depression may help explain the relationships between resilience and posttraumatic stress symptoms and dissociation. Tailored prevention programs and treatments based on resilience and depression may prevent posttraumatic stress symptoms and dissociation in firefighters and improve treatments outcomes among firefighters with posttraumatic stress symptoms and/or dissociation.
인천국제공항의 수익원 다양화 방안에 관한 연구 -해외 공항의 사례를 바탕으로-
권태훈 ( Tae Hoon Kwon ),김기웅 ( Kee Woong Kim ) 한국항공운항학회 2009 한국항공운항학회지 Vol.17 No.4
Incheon International Airport as the gateway to Korea is having the happiest time with those honorable prizes. But in these days, the trend of aviation is changing rapidly, so many rival airports in the world as well as north-east asian countries are rushing to find new revenue sources not to be turned over. Hence Incheon International Airport should push into fresh fields or create new sources of business keeping innovation by making foreign airports its role model. This study brings up some new profit models of foreign airports; Malaysia`s Kuala Lumpur International Airport, China`s Xiamen Aviation Industry Zone, German`s Frankfurt Fraport Airports Group. This study analyzes the status of listed airports and presents strategies after investigating whether they are suitable for and compatible to Incheon International Airport.
권태훈(Tae-Hoon Kwon) 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.6
최근 소비자들은 스마트 폰 및 관련 카메라 이용 어플리케이션들로 인하여, 폰 카메라의 관심 및 접근성이 높다. 이러한 상황에 발 맞춰, 폰 카메라에 대한 기능에 대한 요구사항들도 많아지게 되었다. 최근의 폰 카메라들은 고 화소 렌즈 뿐만 아니라 자동 초점 기능(AF : Auto Focus), 그리고 광학 이미지 안정화 기능(OIS : Optical Image Stabilization) 까지 탑재되어 있으며, 이러한 기능들을 활용하여 사용자가쉽게 초점을 잡을 수 있고, 보다 더 선명한 이미지를 얻을 수 있도록 하고 있다. 따라서 본 논문에서는 OIS 기능에서 핵심적인 부품이라 할 수 있는 VCM(Voice Coil Motor) 액추에이터의 자기장 분석을 통한 특성 해석을 함으로써, 카메라 모듈의 크기와 제작비용을 줄이고 전력 효율을 향상시킬 수 있게끔 도움을 줄 수 있을 것이라 기대하고 있다. 그리고 이 논문은 실험실에서 시뮬레이션 프로그램을 통하여 진행하였으며, 해당 실험 결과를 통해 안정된 로렌츠 힘(Lorentz Force)을 공급할 수 있는 발전된 카메라 모듈 설계로 이어질 것으로 예상한다.