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이규섭,박재범,송승한,오상하,강낙헌,Lee, Kyu-Seop,Park, Jae Beom,Song, Seung Han,Oh, Sang Ha,Kang, Nak Heon 대한두개안면성형외과학회 2013 Archives of Craniofacial Surgery Vol.14 No.2
Except for special situations, it is generally agreed that best results in the treatment of facial fractures is expected if reduction is done within the first 2 or 3 weeks after injury. We reduced facial bone fractures at 4 to 7 weeks after trauma. A 44-year-old female patient underwent open reduction for her right zygomaticomaxillary complex fracture at 7 weeks after injury. A 59-year-old female patient underwent surgery for the right mandible body and left parasymphysis fractures at 4 weeks after injury. Using traditional approaches, granulation tissue and callus were removed from the fracture sites, and malunited fracture lines were separated by a small osteotome. We reduced the displaced fractured zygoma and mandible to their normal anatomical positions and fixed them using titanium plates. No complications such as asymmetry, malunion, malocclusion, or trismus were seen. Unfavorable asymmetric facial contours were corrected, and we obtained good occlusion with favorable bony alignment. The functional and aesthetic outcomes were satisfactory. Through removal the callus and limited osteotomy, a successful approach to the previously fractured line was possible, and an exact correction with symmetry was obtained. This method can be a good option for obtaining good mobility and clinical results in treating delayed facial bone fractures.
이식된 결합조직 교원막이 초기 접합상피의 근단전이 억제에 미치는 영향에 관한 연구
이규섭,이재현,정진형,Lee, Kyu-Seop,Lee, Jae-Hyung,Chung, Chin-Hyung 대한치주과학회 1993 Journal of Periodontal & Implant Science Vol.23 No.1
After periodontal surgery, the potential healing responses were occurred by interaction among junctional epithelium, gingival connective tissue, alveolar bone and periodontal ligament. The only cell that created periodontal regeneration was derived from periodontal ligament. The aim of the study was to evaluate the regenerative effects of the collagen membrane($collacote^{\circ}C$) and autogenous connective tissure graft with periosteum. Experimental periodontitis were created in furcation area of 4 adult dogs with bone removal and gutta percha packing. After 6 weeks later, the gutta percha was removed and experiment was performed divided by 3 groups. 1) Flap operation(control group). 2) Flap operation with collage membrane(Experimental group I). 3) Flap operation with autogenous connective tissue graft with periosteum (Experimental group II). After dogs were sacrificed after two and three weeks, specimens were prepared and stained with hematoxylin-eosin and masson-trichrome stain for light microscopic study. The results were as follows : 1. In all gruoups, connective tissue compartments were increased from two to three weeks especially in experimental group I. 2. Collagen membrane and connective tissue were increased collagen deposits of periodontal ligament. Therefore collagen fiber attached to tooth surface was seen. 3. In al experimental groups, newly forming alveolar bone was seen. 4. Collagen membrane and connective tissue were which prevented proliferation of epithelium, aided connective tissue new attachment and influenced periodontal regeneration.
테라헤르츠파 발생을 통한 반강자성체 내 초고속 스핀 전류 검출
이규섭(Kyusup Lee),김영훈(Younghoon Kim),이인서(Inseo Lee) 한국자기학회 2024 韓國磁氣學會誌 Vol.34 No.2
인접한 반평행 스핀 사이의 강력한 교환 상호작용에 의해 결정되는 반강자성의 스핀 동역학은 일반적으로 강자성체보다 1000배 빠른 THz 주파수대역이다. 이러한 동적 특성은 초고속 스위칭 장치에 적용될 수 있는 잠재적 토대를 마련하는데 의의가 있다. 스핀 전류의 시간 폭은 전체 스위칭 시간을 결정하는 중요한 요소이므로, 피코초 이하의 초고속 스위칭을 위한 THz 스핀 거동을 활용하기 위해서는 반강자성체 내 초고속 스핀 전류를 발생하고 능동적으로 조작하는 것이 필수적이다. 본 해설논문에서는 스핀트로닉 THz 발생법을 기반으로 반강자성체에서 THz 대역의 스핀 전류발생에 대한 최근 실험 결과들을 소개한다. 이 리뷰를 통해 반강자성체를 기반으로 한 초고직접도 초고속 자기 저항 메모리의 상용화에 보다 근접한 연구 결과를 제공하고, 반강자성 재료로만 구성된 차세대 스위칭 디바이스의 개발을 위한 초석을 마련하고자 한다. The spin dynamics of antiferromagnets operates at THz frequencies, primarily driven by the robust exchange interaction between neighboring antiparallel spins, being typically 1000 times faster than that of ferromagnets. This dynamic characteristic lays the groundwork for potential applications to ultrafast switching devices. To unlock the THz spin dynamics for the sub-picosecond switching, it becomes imperative to both generate and actively manipulate the antiferromagnetic (AFM) spin currents because the spin currents play a pivotal role in determining the overall switching time. This review, particularly based on THz emission spectroscopy, delves into recent experimental findings of the generation of AFM spin currents in THz frequencies. These experiments serve as a cornerstone for the advancement of next-generation switching devices constructed entirely from AFM materials.