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문원규,박종규 대한기계학회 2004 大韓機械學會論文集A Vol.28 No.2
In this article, the constitutive relations of three types of piezoelectric benders, which are a unimorph bender, a bimorph bender and a triple-layer bender, are derived based on the beam theory under the quasi-static equilibrium condition. The relation coefficients are described as the geometry and material properties of the benders. More general constitutive relations involving fixed-free, fixed-roll, and fixed-simply supported boundary conditions under the inconsistent length condition between the piezoelectric layer and the nonpiezoelectric one are discussed. The complicated constitutive relations can be easily calculated and checked by using the symbolic function in Mathematica. The relation coefficients for the benders are plotted in three dimensional graph using the developed program.
치은암의 하악골 침범에 관한 방사선학적 및 조직학적 연구
문원규,차인호,홍순재,백석기,최성원,이의웅,이은하,김진,Moon, Won-Gyu,Cha, In-Ho,Hong, Soon-Xae,Baik, Suk-Kee,Choi, Sung-Won,Lee, Eui-Wung,Lee, Eun-Ha,Kim, Jin 대한악안면성형재건외과학회 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.1
The route of bony invasion and spread pattern of tumor in the mandible are important in management of gingival cancer. Ten patients with gingival cancer involving mandibular body region were operated by composite resection. The radiographic and histopathologic features of the mandibular invasion and spread were analysed and compared. Our results showed that histopathologic extent of tumor invasion were greater than the radiographic prediction, especially in width of the tumor. And the pattern of bony invasion in the body area was mostly found in transmedullary spread rather than perineural spread. The vertical involvement in the mandibular body with tumor was evaluated. It indicated that if a oncologic surgeon was to ensure an adequate safety margin for extirpation of tumor, in most cases, the maintenance of the mandibular continuity is difficult. If the mandibular involvement by gingival cancer was identified radiographically and clinically, segmental mandibulectomy was required for the adequate safety margin, in consideration of the spread pattern in the body area.
백석기,김형곤,윤현중,허종기,박광호,문원규 대한 두개하악 장애학회 1998 대한두개하악장애학회지 Vol.10 No.1
Purpose: The aim of this study is to clarify the characteristic clinical features of patients with temporomandibular joint disc perforation, which will be helpful in diagnosis and management of them. Materials and Methods: We evaluated retrospectively the clinical symptoms, such as location and severity of pain, habits, mouth opening limitation and temporomandibular joint sound. Ninety patients had perforation in the disc or retrodiscal tissue, out of 582 patients who were diagnosed as TMJ internal derangement and received surgical treatment in the TMJ clinic, Yongdong Severance Hospital, from 1992 to 1997; sixty patients with final diagnosis of anterior meniscus displacement without reduction not having any other pathosis such as adhesion, hyperemia and perforation, were used as the control group for further analysis. Results: The chief complaint at the time of the first visit was TMJ pain(68.9%) for the perforation group and TMJ pain(51.7%) and mouth opening limitation(28.3%) for the control group. History of facial trauma(8.8% vs 3.3%) and open-lock(15.6% vs 5.0%) was more common in the perforation group than in the control group, but closed-lock history was more common in the control(38.3% vs 25.6%). Bruxism was more common in the perforation group(23.3% vs 8.3%). Mouth opening over 40mm was more significant in the perforation group(34.4%) than in the control group(16.7%). Moderate and severe TMJ pain during palpation on the TMJ area were found 28.9% and 27.8% in the perforation group and 10.0%, 3.3% in the contol group. Crepitus was found in the perforation group(34.4%) and not in the control group. Headache was not significant between two groups, but neck pain and shoulder pain were more common in the perforation group(38.9%, 37.8%) than in the control group(21.7%, 15.0%). Conclusions: Significant findings of the perforation group were maximum mouth opening over 40㎜, crepitus, moderate and severe tenderness during palpation on the TMJ area, neck pain, shoulder pain, bruxism and/or clenching(p(0.05). Postoperative follow-up study might be necessary to clarify the above findings.