치과 임플란트 치료계획시 상악동의 CBCT 영상에서 우연히 발견된 fungus ball의 일례

이병도,Lee, Byung-Do 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.2

This report was to show the radiographic appearances of the fungus ball in a paranasal sinus and to emphasize the scan area of cone beam computed tomography (CBCT) to detect the calcification in the paranasal sinus. A seventyfour-year-old woman visited our department for the implant rehabilitation at both maxillary posterior edentulous region. Pre-operative radiographic examinations including the panoramic, CBCT, and multidector CT images were taken. An opacification in the right maxillary sinus was observed on the multiplanar image of CBCT, however the pre-determined scan area of CBCT in this report hardly showed the calcifications at the central portion of the maxillary sinus. The opacification in the maxillary sinus could be misdiagnosed as chronic maxillary sinusitis if the calcification of fungus ball was not simultaneously detected. The scan area of pre-operative CBCT needs to be enough to scan the paranasal sinus from top to bottom.

다층 구조 신경회로망의 학습 속도 향상을 위한 활성화 함수의 변화

이병도,이민호,Lee, Byung-Do,Lee, Min-Ho 한국센서학회 1999 센서학회지 Vol.8 No.1

이 논문에서는 오차 역전파 학습 알고리듬의 학습 속도를 향상시키기 위한 새로운 학습 방법을 제안한다. 제안하고자 하는 방법은 시그모이드 형태를 갖는 신경회로망의 활성화 함수(activation function) 자체에 고차항(higher order)을 적절히 이용하여 초기 학습 단계에서 발생할 수 있는 조기 포화(premature saturation) 현상을 계산량의 큰 증가 없이 효과적으로 대처할 수 있다. 고차항을 이용함으로써 은닉층 활성화 함수의 도합수가 작은 값으로 감소함에 따라 신경망의 연결 강도를 학습시키는 학습율은 적응적으로 큰 값을 갖게 된다. 또한, 은닉층에 고차항을 이용하는 제안한 방법에 모멘텀(momentum) 학습 알고리듬을 결합하는 새로운 hybrid 학습 방법을 제안한다. 컴퓨터 모의 실험을 통해 제안하고자 하는 학습 방법과 기존의 방법들과의 학습 속도 성능을 비교한다. In this raper, an enhanced learning method is proposed for improving the learning speed of the error back propagation learning algorithm. In order to cope with the premature saturation phenomenon at the initial learning stage, a variation scheme of active functions is introduced by using higher order functions, which does not need much increase of computation load. It naturally changes the learning rate of inter-connection weights to a large value as the derivative of sigmoid function abnormally decrease to a small value during the learning epoch. Also, we suggest the hybrid learning method incorporated the proposed method with the momentum training algorithm. Computer simulation results show that the proposed learning algorithm outperforms the conventional methods such as momentum and delta-bar-delta algorithms.

의학적 의사결정 도구들에 대한 고찰 : Bayesian analysis and ROC analysis

이병도,Lee Byung-Do 대한영상치의학회 2006 Imaging Science in Dentistry Vol.36 No.1

During the diagnostic process of the various oral and maxillofacial lesions, we should consider the following: 'When should we order diagnostic tests? What tests should be ordered? How should we interpret the results clinically? And how should we use this frequently imperfect information to make optimal medical decisions?' For the clinicians to make proper judgement, several decision making tools are suggested. This article discusses the concept of the diagnostic accuracy (sensitivity and specificity values) with several decision making tools such as decision matrix, ROC analysis and Bayesian analysis. The article also explain the introductory concept of ORAD program.

악안면부의 섬유골성 병소 명칭에 대한 고찰

이병도,Lee, Byung-Do 대한영상치의학회 2007 Imaging Science in Dentistry Vol.37 No.1

Fibro-osseous lesions are composed of connective tissue and varying amount of mineralized substances, which may be bony or cementum-like structures. It is necessary for oral radiologist to differentiate due to the tendency of these fibro-osseous lesions to show similar histopathologic appearances, while the management of each lesion is different. However we often encounter a little difficulty in judgement because there are some overlaps between concept of each lesions. So recently I suggest, we face a need to review basic concept and classification of several fibro-osseous jaw lesions. In this article, several fibre-osseous lesions, such as fibrous dysplasia, cemento-ossifying fibroma and cemento-osseous dysplasia, will be discussed basing on the review of literature. particular emphasis will be made on the nomenclature revision of WHO's classification in 1992.

형질변형성장인자가 손상골 재생능에 미치는 영향에 관한 실험적 연구

이병도,황의환,이상래,홍정표,Lee Byung-Do,Hwang Eui-Hwan,Lee Sang-Rae,Hong Jung-Pyo 대한영상치의학회 1995 Imaging Science in Dentistry Vol.25 No.2

The purpose of this study was to observe the effect of TGF-βl, which promotes differentiation and proliferation of osteoblasts, on bone regeneration. Experimental bone defects that measured 3 mm in diameter were created on the mandibles of guinea pig by removal of bone with the use of trephine burs. In one side of mandibular body, the experimental groups, bone defects were grafted with Biogran(Orthovita Co., U.S.A) and TGF-β1(R&D System Co., U.SA). In the remaining side of the mandiblar body, the control groups, bone defects were grafted with only Biogran. Guinea pigs in the control and experimental groups were serially terminated by fours on the 3 days, the 1 week, the 2 weeks, the 3 weeks, and the 4 weeks after experiment, and both sides of the mandibular bodies were removed and fixed with 10% neutral formalin. They were decalcified and embedded in paraffin as using the usual method. The specimen sectioned and stained with hematoxylin and eosin. Also, they were radiographed with a soft X -ray apparatus. The obtained results were as follows; 1. Hemorrhagic condition, observed in the granulation tissues, disappeared on the 1 week after experiment in both groups, and more prominent in the experimental group. The granulation tissues of the experimental group had larger number of cells than those of the control group. 2. Osteoblastic differentiation in the margin of grafted material and adjacent bone was observed on the 1 week after experiment in both groups. Also, bone formation was observed in immature form on the 1 week after experiment. and more prominent in the experimental group. 3. In the polarizing microscopic examination, bone matrix was very loose on the 1 week after experiment, but increase in density with time, and more prominent in the experimental group. 4. In the microradiographic examination, newly formed bone was observed in the experimental group on the 2 weeks after experiment, and this was observed earlier than in the control group. Newly formed bone was increased with time and defected area was markedly decreased on the 4 weeks after experiment.

상악 골수염을 동반한 골화석증의 증례보고

이병도,박용찬,강승환,김보국,권경환,이승훈,Lee, Byung-Do,Park, Yong-Chan,Kang, Seung-Hwan,Kim, Bo-Guk,Kwon, Kyung-Hwan,Lee, Seoung-Hoon 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.4

Osteopetrosis is a rare bone disease characterized by systemic osteosclerosis due to an osteoclast dysfunction that decreases bone resorption. This report demonstrates two cases of adult osteopetrosis with secondary osteomyelitis of the maxilla, in siblings who are 43-year old female and 55-year old, male respectively. The common radiographic features of these cases were increased radiopacity in skull, rib and vertebra. The radiographic features that differed between these two cases were the osteosclerotic pattern of the jaw bones, that is, diffuse patterns in the female case, while the male case showed nodular patterns that were confined to the root apices. The diagnosis of osteopetrosis may be complicated due to the varying degree of osteosclerosis on panoramic radiograph. Additional radiographs such as the chest and skull radiograph may be helpful for the diagnosis of osteopetrosis.

Anthelmintic Efficacy of Tetramisole Against Experimental Infection of Swine Lungworm, Metastrongylus Apri

이병도,김진복,Lee, Byung Do,Kim, Chin Bok The Korean Society of Veterinary Science 1968 大韓獸醫學會誌 Vol.8 No.1

가축(家畜)의 선충류에 구충효력이 우수(優秀)하다는 Tetramisole을 이용(使用)하여 폐충인공감염돈에 5, 7, 5, 10, 및 12.5mg/kg을 사료(飼料) 혼여(混與) 및 피하주사(皮下注射)로서 구충효력을 검토(檢討)한 결과(結果) 다음과 같은 성적(成績)을 얻었다. 1. 투약별(投藥別)로 보면 10~12.5mg/kg이 가장 우수(優秀)하였다. 2. 투약별(投藥別)로 보면 사료혼여(飼料混與)가 피하주사법(皮下注射法)보다 우수(優秀)하였고 부작용(副作用)도 적었다. 3. 감염후(感梁後) 4내지 15일(日)째의 유약충에도 구충효과가 있었다. 4. 주요부작용(主要副作用)은 기침, 구토(嘔吐), 흥구(興舊), 호흡수증가등(呼吸數增加等)이었으나 일과성(一過性)으로 곧 소실(消失)되었고 투약(投藥)을 5~12.5mg/kg 범위내(範圍內)에서는 투약량(投藥量)이 따른 부작용(副作用)의 차이(差異)는 인정(認定)되지 않았다. Oral and subcutaneous administration of Tetramisole (d1-2, 3, 5, 6-tetrahydro-6-phenyl-imidazo- 2, 1-b thiazole hydrochloride) was effective in controlling the adult and immature forms of Metastrongylus apri in pigs when administered at the dose of 10-12.5 mg per kg of body weight.

하악골 후방부위에서 다양한 방사선학적 소견을 보이는 골화성섬유종의 증례보고

이병도,오승환,손현진,Lee, Byung-Do,Oh, Seung-Hwan,Son, Hyun-Jin 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.1

Common radiographic appearances of ossifying fibroma (OF) are well demarcated margin, radiolucent or mixed lesion. Lesions for the radiographic differential diagnosis with OF include fibrous dysplasia, focal cemento-osseous dysplasia. Other confusing lesions might be the mixed lesions such as calcifying odontogenic cyst, adenomatoid odontogenic tumor, calcifying epithelial odontogenic tumor, and benign cementoblastoma. We reported three cases of OF in posterior mandible. These cases showed a little distinguished radiographic features of OF and diagnosed from a combination of clinical, radiographic, and histopathologic information. We need to further refine radiographic and histopathological features of OF and other confusing lesions with literatures review because some cases of these lesions are not easily differentiated radiographically and histopathologically.

클라우드 컴퓨팅 환경에서의 안전한 로그 시스템 설계

이병도(Byung-Do Lee),신상욱(Sang Uk Shin) 한국멀티미디어학회 2016 멀티미디어학회논문지 Vol.19 No.2

1920-1940년 기간의 태국-일본 관계

이병도 ( Byung Do Lee ) 한국외국어대학교 동남아연구소 2004 東南亞硏究 Vol.14 No.1