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權奇淨,정우 中央醫學社 1968 中央醫學 Vol.15 No.5
Congenital esophageal stricture is an infrequent cause of neonatal or infantile esophageal obstruction. Waterston and others (1962) have pointed out that many of the children in whom congenital stenosis of the esophagus was formerly diagnosed, in fact, have inflammatory strictures secondary to hiatus hernia and esophagitis. Nevertheless, a certain number of congenital esophageal stricture do occur in the absence of hiatus hernia and/or esophagitis. Case of congenital esophageal stenosis due to fibrous strictures and webs or lower esophageal ring (Schatzki's ring) have been described, though they are not common. We have recently encountered a case of congenital stenosis of the esophagus caused by a ring containing cartilages and giving rise to the same clinical and radiological manifestations as those of achalasia.
디지털방사선촬영술을 이용한 인접면 치아우식증 진단에 관한 실험적 연구
권기정,황의환,이상래,Kwon Ki Jeong,Hwang Eui-Hwan,Lee Sang Rae 대한영상치의학회 1994 Imaging Science in Dentistry Vol.24 No.1
The purposes of this study were clinical comparison and evaluation between digital radiography and conventional radiography for the detection of artificial interproximal caries. Four freshly extracted, unrestored posterior teeth were obtained and caries was simulated by drilling semicircled defects with variable size at the interproximal surface of each tooth. The experiments were performed with IBM-PC/32 bit-DX compatible, video camera(VM-S8200, Hitachi Co., Japan), and color monitor(Multisync 3D, NEC, Japan). Sylvia Image Capture Board for the ADC(analog to digital converter) was used, and spatial resolution was 512 × 480 with 256 gray levels. The obtained results were as follows: 1. At the condition of under exposure, the radiographs were superior to the digital images in readability. Also, as the size of the artificial lesion was increased, readability of the radiographs was elevated. 2. The digital images were superior to the radiographs in readability especially under over exsposure. 3. As the exposure time and size of lesion was increased, the gray level of region of interest of the digital image was decreased proportionally. 4. As the F-value of average gray level of region of interest at individual exposure time and size of lesion, gray level of the all lesion sizes was decreased in comparison with that of the normal enamel.
방사선 조사선량에 따른 백서 악하선의 caspase-3 발현양상
권기정,최용석,황의환,이상래,고광준,Kwon Ki-Jeong,Choi Yong-Suk,Hwang Eui-Hwan,Lee Sang-Rae,Koh Kwang-Joon 대한영상치의학회 2006 Imaging Science in Dentistry Vol.36 No.1
Purpose : To investigate the caspase-3 expression in the acinar and ductal cells of rat submandibular glands after the irradiation of various doses. Materials and Methods : The male Sprague-Dawley rats weighing approximately 250 gm were used for this study. The experimental group was irradiated with a single absorbed dose of 2, 5, 10, and 15 Gy on the head and neck region. The rats were sacrificed on the 1st, 3rd, 7th, 14th, 21 st, and 28th day after irradiation. The specimens including the submandibular gland were sectioned and observed using histopathological and immunohistochemical methods. Results : The local destruction of the acinar and ductal cells and the karyopyknotic nuclei of the acinar cells were observed in the 2 Gy and 5 Gy irradiation groups later than in the 10 Gy and 15 Gy irradiation groups. And the expression of caspase-3 was prominent only in the ductal cells in the 2 Gy and 5 Gy irradiation groups. Conclusion : This experiment suggests that radiation-induced apoptosis in the ductal cells of rat submandibular glands was induced by a low dose radiation associated with the activation of caspase-3 and radiation-induced necrosis was induced by a high dose radiation.
權奇政 인제대학교 낙동강환경연구소 1992 심포지움(인제대학교 부설 환경연구소 발표논문집) Vol.- No.1
많은 연안의 저습지와 하구는 개발에 의해 위협을 받고 있다. 만약 이들 지역이 모두 변한다면 섭금류와 수금류는 그곳에서 채식과 휴식을 할 수 없으므로 다른 곳으로 이동을 하거나 혹은 죽을 것이다. 그러나 어느 한 부분만이 개발이 된다면 전체 지역을 이용하고 있던 새들이 제한된 지역에 적응할 수 있느냐는 의문이 제기된다. 이 것에 대한 일반적인 답은 새들은 현재 이용하고 있다고 생각하는 면적보다 더 적은 지역에서 물리적으로 기숙할 수 있거나, 더 접합한 장소를 발견한다면 어느 곳이라도 기숙을 할 수 있다는 것이다. 그러나 그 지역에 새의 밀도가 증가하면 각 개체의 먹이 섭취률이 감소하기 때문에 생존의 기회는 어느 쪽이나 감소할 것이다(Goss-Custard, 1980). 그 중 가장 중요한 것은 일정 지역에 나타나는 각 종의 수를 제한하는 요인과 이들 제한 요인이 한 해의 어느 시기에 영향을 미치느냐에 대한 해답을 구하는 것이다.
측두하악관절 내장증 환자의 임상증상과 자기공명영상 소견의 비교 연구
권기정 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.2
Purpose : To determine the clinical correlation of magnetic resonance imaging (MRI) findings of temporomandibular joint internal derangements. Materials and Methods : The MR images of 150 TMJs in 75 patients were analyzed. The clinical symptoms were pain in the preauricular area and masticatory muscles and TMJ sounds. Results : There was a statistically significant relationship between the MRI diagnoses of different types of disc displacements and clinical findings of pain, clicking, and crepitus. The risk of TMJ pain was increased when the disc displacement without reduction occurred at the same time in combination with the osteoarthrosis and effusion. Conclusion : Regardless of the results, the data indicate that each of these MR imaging variables may not be regarded as the unique and dominant factor in defining TMJ pain occurrence.