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이병도,이완,팽준영,이준,최문기,손현진 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.3
The calcifying odontogenic cyst (COC) is a rare disorder of the jaws and shows various radiographic features. The purpose of this study is to describe the different radiographic appearances of 2 cases of COC. Case 1 was located in the posterior maxilla extending into maxillary sinus, showing unilocular radiolucency with a well-defined margin. Cortical bone expansion and thinning were prominent. Root resorption of adjacent teeth was apparent. Case 2 showed unilocular radiolucency with a calcified material. Calcification was supposed to be dystrophic dental hard structures, detected at the periphery of the lesion. Ghost cell and proliferation of ameloblastoma-like tissues were common features for these two lesions on histopathological findings. This reports presented common and atypical radiographic features of the COC. (Korean J Oral Maxillofac Radiol 2009; 39 : 169-73)
혈액 투석 환자에서 중심정맥 협착에 대한 스텐트 삽입술 : Wallstent Placement
임대승,노상필,이유선,정승현,김보영,이정우,강정아,김정희,이민수,정준용,최시완,정진옥,성인환,이강욱,신영태 충남대학교 의과대학 의학연구소 2002 충남의대잡지 Vol.29 No.1
Stenosis of central vein is a common complication arising after percutaneous subclavian vein catheter insertion performed for temporary vascular access in chronic renal failure patients undergoing hemodialysis. There are several treatment methods for the condition like percutaneous angioplasty(PTA), stent insertion, and surgery, but recent trend is toward PTA and stents. Among the patients diagnosed with chronic renal failure from March 1993 to May 2002 and undergoing hemodialysis through AV fistula, the 14 Patients in whom central vein stenosis arose were selected for the study. A total of 28 percutaneous interventions(5 PTA and 23 stent placement) were performed, and restenosis rate and the time taken till the restenosis in de novo lesions and instant lesions were compared. All 28 cases were operated successfully. The 14 cases that received both anigioplasty and stent placement initially. (de novo lesion : 14 cases), Among the 10 cases with de novo lesion that followed up more than 1 year, 3 cases are currently undergoing hemodialysis without restenosis, and the remaining 7 cases have recurred stenosis with the mean time to restenosis of 10.9 months. In the 7 cases in whom stenosis recurred, 11 interventions were done(instent lesion: 11 cases). 4 of these were using only ballon angioplasty with 100% restenosis rate and the mean time of 3 months until restenosis. The remaining 7 cases were using both balloon angioplasty and stent placement, also with 100% restenosis rate but with the mean time of 12 months until restenosis, which was later than the group receiving only balloon angioplasty. In treating the patients with central vein stenosis, stent placement seems to be more advantageous over PTA in terms of restenosis rate and the mean duration of patency. In the case of instent lesion, inserting the stent for the second time after stenosis recurred lengthened the duration of patency compared to performing balloon angioplasty alone.
이병도,이완,팽준영,손현진 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.1
Although odontogenic myxoma (OM) has various radiographic appearances, the characteristic features of OM are the multilocular radiolucent lesion, straight bony septa along the margin forming either square or triangular spaces. We present a case of OM in a 25-year old-male patient. Multilocular radiolucent lesion on the left mandible body showed tennis racket appearance. Cone beam computed tomography (CBCT) showed straight bony septa along the margin and cortical perforation. This CBCT features would have significantly contributed to allowing a diagnosis of OM. We think that this case shows characteristic radiographic features of odontogenic myxoma.
이병도,이완,권경환,팽준영,손현진 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.2
Adenomatoid odontogenic tumor(AOT) is a tumor of odontogenic epithelium with varying degrees of inductive changes in the connective tissue. The common radiographic appearance of AOT is a unilocular radiolucency associated with an unerupted tooth. Detectable radiopacities have been reported in many cases. We present a case of AOT in a 9-year old-female patient. Cystic lesion with numerous, punctuate radiopaque foci was observed on the anterior region of the mandible. These radiopacities were situated mostly on the buccal side of impacted tooth on the multi-planar images of cone beam computed tomograph. Characteristic duct like structures and amyloid like material were observed on histopathologic finding.
이민중,박진현,최태완,이태환,배준경 진주산업대학교 1999 論文集 Vol.38 No.-
This paper introduces an adaptive compensator for PID controller using a neural network without the plant model. The reference input of a PID controller is converted to a newly learned input by a neural network compensator. The new reference input considers the situation between existing disturbance and time-varying plant parameters. The learned input assists the plant output to trace the reference input properly. The multilayer neural network is employed for the reference compensator. The back error propagation algorithm is used to minimize the errors between the reference and plant outputs. The simulation results show that the proposed method is more robust than a PID controller with fixed gain.
이병도,이완,김진화,최동훈,팽준영,김은철 대한구강악안면방사선학회 2008 Imaging Science in Dentistry Vol.38 No.2
The unicystic ameloblastoma (UA) is a variant of the solid or multicystic ameloblastoma, a less encountered variant of the ameloblastoma. It appears more frequently in the second or third decade with no sexual or racial predilection. It is almost exclusively encountered asymptomatically in the posterior mandible. We report a case of a 43-year old patient with UA, who had previously undergone a surgical treatment on the same site about 1 year ago, this lesion recurred and presented as an exophytic gingival lesion in the anterior mandibular region.