디지탈영상의 치근이개부 골손실 판독효과에 관한 실험적 연구

오봉현,황의환,이상래 慶熙大學校 齒科大學 1995 慶熙齒大論文集 Vol.17 No.2

The aim of this study was to evaluate and compare observer performance between conventional radiographs and their digitized images for the detection of bone loss in the bifurcation of mandiblar first molar. One dried human mandible with minimal periodontal bone loss around the first molar was selected and serially enlarged 17 step defects were prepared in the bifurcation area. The mandible was radiographed with exposure time of 0.12, 0.20, 0.25, 0.32, 0.40, 0.64 seconds, after each successive step in the preperation and all radiographs were digitized with IBM-PC/32 bit-DX compatible, video camera (VM-S8200, Hitachi Co., Japan), arid color monitor(Multisync 3D, NEC, Japan). Sylvia Image Capture Board for the ADC(analog to digital converter) was used. The obtained results were as follows: 1. In the conventional radiographs, the mean score of the readability was higher at the condition of exposure time with 0.32 second. Also, as the size of artificial lesion was increased, the readability of radiographs was elevated (P<0.05). 2. In the digital images, the mean score of the readability was higher at the condition of exposure time with 0.40 second. Also, as the size of artificial lesion was increased, the readability of digital images was elevated(P<0.05). 3. At the same exposure time, the mean scores of readibility were mostly higher in the digitized images. As the exposure time was increased, the digital images were superior to radiographs in readability. 4. As the size of lesion was changed, the digital images were superior to radiographs in detecting small lesion. 5. The coefficient of variation of mean score has no significant difference between digital images and radiographs.

디지털영상의 치근이개부 골손실 판독효과에 관한 실험적 연구

오봉현,황의환,이상래,Oh Bong-Hyeon,Hwang Eui-Hwan,Lee Sang-Rae 대한영상치의학회 1995 Imaging Science in Dentistry Vol.25 No.2

The aim of this study was to evaluate and compare observer performance between conventional radiographs and their digitized images for the detection of bone loss in the bifurcation of mandiblar first molar. One dried human mandible with minimal periodontal bone loss around the first molar was selected and serially enlarged 17 step defects were prepared in the bifurcation area. The mandible was radiographed with exposure time of 0.12, 0.20, 0.25, 0.32, 0.40, 0.64 seconds, after each successive step in the preperation and all radiographs were digitized 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. The obtained results were as follows: 1. In the conventional radiographs, the mean score of the readability was higher at the condition of exposure time with 0.32 second. Also, as the size of artificial lesion was increased, the readability of radiographs was elevated (P<0.05). 2. In the digital images, the mean score of the readability was higher at the condition of exposure time with 0.40 second. Also, as the size of artificial lesion was increased, the readability of digital images was elevated(P<0.05). 3. At the same exposure time, the mean scores of readibility were mostly higher in the digitized images. As the exposure time was increased, the digital images were superior to radiographs in readability. 4. As the size of lesion was changed, the digital images were superior to radiographs in detecting small lesion. 5. The coefficient of variation of mean score has no significant difference between digital images and radiographs.

교회교육 지도자들을 위한 전문지 / 가정교육 : 아기학교

오봉현 장로회신학대학교 기독교교육연구원 1988 교육교회 Vol.- No.145

디지탈영상의 치근이개부 골손실 판독효과에 관한 실험적 연구

이상래,황의환,오봉현 大韓口腔顎顔面 放射線學會 1995 Imaging Science in Dentistry Vol.25 No.2

The aim of this study was to evaluate and compare observer performance between conventional radiographs and their digitized images for the detection of bone loss in the bifurcation of mandiblar first molar. One dried human mandible with minimal periodontal bone loss around the first molar was selected and serially enlarged 17 step defects were prepared in the bifurcation area. The mandible was radiographed with exposure time of 0.12, 0.20, 0.25, 0.32, 0.40, 0.64 seconds, after each successive step in the preperation and all radiographs were digitized 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. The obtained results were as follows: 1. In the conventional radiographs, the mean score of the readability was higher at the condition of exposure time with 0.32 second. Also, as the size of artificial lesion was increased, the readability of radiographs was elevated(P<0.05). 2. In the digital images, the mean score of the readability was higher at the condition of exposure time with 0.40 second. Also, as the size of artificial lesion was increased, the readability of digital images was elevated(P<0.05). 3. At the same exposure time, the mean scores of the readability were mostly higher in the digitized images. As the exposure time was increased, the digital images were superior to radiographs in readability. 4. As the size of lesion was changed, the digital images were superior to radiographs in detecting small lesion. 5. The coefficient of variation of mean score has no significant difference between digital images and radiographs.

輸入畜産物이 畜産振興에 미치는 影響에 관한 硏究

李瓆鉉,吳鳳國 서울大學校 農科大學 1980 서울대농학연구지 Vol.5 No.1

The major objectives of this study were to analyze the factors affecting the volume of demand for and supply of livestock products, to measure the necessary minimum level of livestock products import and the effects of imported products on the domestic livestock sector, and to recommend some policy adjustments for rational development of the sector in Korea. For this study time-series and cross-sectional data were used in calculating demand and supply functions. The estimated results were compared with the other projections on demand for and supply of livestock products in finding problem areas and for measurement of the minimum level of livestock products import. Also, various index were culculated for measurement of the effects of imported products on the changes in levels of prices, consumption, and production and on the other aspects. The major findings of this study were as follow: Per capita consumption of the meat in 1972 was only 1.2kg, but it increased to 220 percent in 1978. Pork consumption increased to 196 percent after import policy was launched. The imported livestock products have contributed to stabilize consumer price and increased level of the consumption. But, the rate of self-sufficiency of the products decreased to 64.7 percent. The recent policy, "Buy abroad whatever cheaper abroad", is to be adjusted in order to maximize domestic production. This policy adjustment may be compared with the Japanese policy maintenance of self-sufficiency in livestock sector at 73.6 percent. The demand projections on livestock products have been made in this study. The results of the projections show that the demand will increase by 86.3 thousand metric tons in 1981, 122.8 thousand metric tons in 1986, and it will reach to 174.7 thousand metric tons in 1991. To match the gap between future demand and supply potentiality, the need for import volume of livestock products will be within a range from 46.5 thousand metric tons to 48.5 thousand metric tons in the target year of 1991. However, in case that the pricing policy is adjusted so as to 10 percent higher level of consummers' and producers' prices, the volume of the meat shortage will decrease to a range from 10.4 thousand metric tons to 14.8 thousand metric tons in the year of 1991. The estimations show that self-sufficiency in livestock products will be achieved by the year of 1986 in the case of adjusting 20 percent of price levels. The decreased consumption of meat can be substituted by domestic pork and chicken for consumers' benefit and the improvement of production incentives for swine and poultry farmers. The consumption promotion activities for pork and chicken products, such as the improvement of cooking methods, are to be needed for the stable growth of this sector. Also it is recommended that capital investment is to be expanded for the development of infra-structure in livestock farming. The negative effects of increased volume of imported products on domestic feed production, farmers' income opportunities and stability in commerical feed industried are to be improved by the policy measures of minimizing the import and maximizing domestic production potentiality.

선천성 심장병의 외과적 고찰

조삼현,오봉석,이동준,Jo, Sam-Hyeon,O, Bong-Seok,Lee, Dong-Jun 대한흉부심장혈관외과학회 1996 Journal of Chest Surgery (J Chest Surg) Vol.29 No.12

선천성 심장병의 외과적 치료 성적은 보고자에 따라 다양한 성적을 가지고 있으며 과거에 비해서 최근 그 치료 성적이 좋아지고 있다. 또한 개심술 연령이 점차 낮아지는 추세이다. 이 본 저자는 전남의대 흉부외과학 교실에서 행한 선천성 심장병의 외과적 치료 성적을 알아보고자 1977년 5월부터 1994년 12월까지 1,060예에 대하여 유아 개심술이 증가한 19.90년을 기준으로 전,후반기를 A군(677예. 1977년~1989년), B군(38)례. 1990년~1994년)으로 나누어 비교 분석하여 다음과 같은 결론을 얻었다. 1. 전체 선천성 심기형 1,060예를 진단별 분류를 해보면 A군(677례)에서는 심실중격결손증(51.0%),심 방중격 결손증(2).6%), Fallot 4징증(16.5%), 폐동맥 협착증(3.0%), 심내막결손증(2.7%), 대혈관 전위 증(0.4%), 단심실(0.3%)순이었고, B군(383예)에서 심실중격결손증 (52.2%), 심방중격결손증(32. 1 %), Fallot 4징증(8.1 %), 심내막결손증(2.1 %), 양대혈관 우심실 기시증(0.8%), 전폐정맥 환류이상증(0.5%), 총동맥간증(0.5%) 순이 었다. 2. 청색증과 비청색증의 분포는 A군은 1:4, B군은 1:8로 B군에서 비청색증의 증가를 보였다. 3.연령별 분포는 1\ulcorner 이하가 A군에서 1례, B군에서는 52례로 유의한 증가를 보였다. 질환별 연령 분포는 심실중격 결손증에서 10세 이하가 A군에서 200예 (58.0%), B군에서 154예 (77%)로 가장 많았으며, 심방중격결손은 A군에서는 11세 부터 20세사이가 62예(39.0%), B군에 서는 10세 이하가 42예(35%) 로 가장 많았으며, Fallot 4징증은 간군에서 11세 부터 20세사이가 49예 (44.6%), B군에서는 5세 이하가 17예 (54.8%)로 가장 많았다. 4. 체중별 분포를 보면 10kg 이하 환자가 A군 : B군(2.5 % : 20.4%)로 B군에서 현저하게 증가하 였다. 5. 전체수술사망률은 A군(7.8%), B군(5.7%)로 B군에서 감소하는 경향을 보였으며, ballot 4징증은 A군 (23.2%), B군(16.1%), 10kg 이하의 환아의 수술사망률은 A군(31.6%), B군(20.5%)로 B군에서 유의한 감소를 보였다. 이상의 결과로 보아 A군과 비교시 B군에서 10kg이하의 환아의 많은 증가를 보이면서 오히려 사망률은 감소하였고, 질환별로는 특히 활롯씨 4징증의 사망률 감소를 보여주고 있는데 이는 선천성 심장병의 수술 성적이 근래 개선되고 있는 것으로 사료되 있다. From May 1977 to December 1994, 1.060 cases of open heart surge y for congenital heart disease were performed under cardiopulmonary bypass in Chonnam University Hospital They were divided into two groups; group A(677 cases, from May 1977 lo December 1989), group B(38B cases, from January 1990 to December 1994), to be compared and analized. Of the 1, 060 cases, there were 889 acyanotic (83.9%) and 171 cyanotic(16.1%). The operative mortality was 7.8% in group A and 5.7% in group B (total : 6.6%). The operative mortality for group A was 25% in cyanotic disease and 3.7% in acyanotic disease, respectively in group B, it was 23.8%, 3.2%. There were 19 patients (3.8%) and 78 patients(20.4%) with body weight under 10kg in group A and group B respectively. The operative mortality for these patients were 31.6% in A group and 16.1% in B group. In result, increasing trend in congenital heart disease in patients under 10 kg of body weight has been noted, whereas mortality has decreased. The operative mortality of tetralogy of Fallot has decreased in group B t an group A. These results suggest that the operative result have improved in recent years.

TUMOR-INDUCED HYPOPHOSPHATEMIC OSTEOMALACLA : Report of Three Cases

Oh, Bong-Hyun,Lee, Sang-Rae,Kim, Soh-Hyun,Hang, Eui-Hwan 大韓口腔顎顔面 放射線學會 1995 Imaging Science in Dentistry Vol.25 No.1

종양유발성 골연화증은 종양에 의하여 생성된 활동성 펩티드호르몬과 유사한 물질이 골이나 위장관에 작용하여 칼슘대사와 인대사의 변화를 일으키거나, 정상적인 비타민 D 대사에 장애를 일으킴으로써 2차적으로 발생되는 대사성 질환으로 알려져 있다. 이의 발생빈도는 매우 낮으며, 임상적으로는 체중과 신장의 감소, 전신적인 골격의 동통 및 근무력증과 병적 골절이 동반되어 나타난다. 방사선사진에서는 골소주의 전반적인 소실, 피질골의 비박, 위골절, 치조백선의 소실등을 보이고, 실험실 소견에서는 혈청인의 농도와 신세뇨관에서 인의 재흡수율의 감소 및 혈청 알칼리성 인상화효소 농도의 상승이 관찰된다. 본질환은 종양이 제거되면 별도의 부가적인 치료없이도 임상적, 방사선학적 소견 및 실험실 소견의 뚜렷한 개선을 보이므로 이의 치료에 있어서 정확한 진단이 매우 중요하다. 저자들은 전신적인 동통과 근무력증을 주소로 내원한 환자들에게서 발생된 종양유발성 골연화증 3예를 경험하였기에 문헌고찰과 함께 이를 보고하는 바이다. Tumor-induced hypophosphatemic osteomalacia has been rarely reported. The clinical and radiographic features of tumor-induced hypophosphatemic osteomalacia are similar to that of hyperparathyroidism, but it is distinguished from hyperparathyroidism on the basis of its different biochemical features, such as normal serum calcium concentration, decreased serum phosphorus concentration, and elevated serum alkaline phosphatase level. The importance of laboratory features of the metabolic disease is emphasized. Since resection of a coexisting tumor without additional treatment lead to prompt a increase in serum phosphorus, recovery of clinical symptom, and remineralization of bone, an accurate diagnosis should be established as quickly as possible. We have recently experienced three cases of tumor-induced hypophosphatemic osteomalacia. The clinical, radiographic, and laboratory features were dramatically improved after resection of the coexisting tumors.

IPTV 서비스 검색을 위한 최적화 정보 기반 메타데이터 캡슐화 구조 설계 및 구현

오봉진,백의현,유관종,Oh, Bong-Jin,Paik, Eui-Hyun,Yoo, Kwan-Jong 한국정보처리학회 2011 정보처리학회논문지 C : 정보통신,정보보안 Vol.18 No.4

TV-Anytime은 XML을 PVR이나 방송서비스에 적용하기 위하여 서비스, 컨텐츠 정보 표현을 위한 스키마와 전송 프로토콜을 정의하여 많은 방송 규격에서 참조 문서로 활용되고 있다. 높은 확장성과 가독성에 비해 텍스트기반으로 정보를 기술하여 문서가 커지는 단점이 존재하며 이를 극복하기 위한 인코딩 알고리즘이 많이 제안되고 있다. 본 논문에서는 TVA 디스크립션을 전송하는 과정에서 문서의 크기를 최소화 할 수 있는 최적화 정보를 서버 단에서 반영하는 효율적인 인코딩 방식과 캡슐화 과정에서 색인 정보에 필요한 정보를 줄이고 정보를 빠르고 직관적으로 수신할 수 있는 인덱싱 방식을 제안한다. TV-Anytime is an XML-based standard for description of PVR and digital broadcast services. It is referenced by many standards of digital broadcast service for their schemas and delivery protocols of contents guide. Although its readability and extensibility, TV-Anytime has a big problem which generates massive documents due to its text-based description method. Therefore, various encoding algorithms have been proposed to reduce the size of XML documents. This paper proposes efficient metadata encapsulation architecture based on the optimization information generated at server-side to minimize XML documents. Advanced indexing method is also proposed to reduce resources needed to encapsulate indices and to receive metadata with fast and explicit mechanism.

식도암의 병기 결정에 있어 흉부 CT의 유용성

오봉석,홍성범,장원채,김윤현,김병표,최용선 대한흉부외과학회 2004 Journal of Chest Surgery (J Chest Surg) Vol.37 No.12

배경 및 목적: 식도암의 병기 결정은 병변의 절제 가능성 여부를 결정하고 환자의 예후를 예측하는 데 지대한 영향을 미친다. 흉부 전산화 단층 촬영(Computerized Tomography, CT)은 식도암의 병기 결정을 위해 현재까지 가장 널리 사용되고 있는 진단 방법 중의 하나이지만, 다양한 위양성 및 위음성 소견에 의해 제한점들이 보고되고 있다. 이에 본 저자는 수술 전 식도암의 병기 결정에 있어서 흉부 CT의 유용성에 대해 연구하고자 하였다. 대상 및 방법: 1999년 1월부터 2003년 6월까지 식도 편평 상피 세포 암으로 진단받고 수술을 시행한 환자 114예를 대상으로 수술 전 CT에 의한 병기와 수술 후 조직 소견에 의한 병기를 후향적으로 비교 분석하였다. CT 진단에 의한 주변 조직 침습, 림프절 침범, 그리고 원위부 전이 여부 등을 관찰하고 , 이를 수술 후 조직 병리 소견과 비교함으로써, 이들의 진단에 대한 CT의 민감도(Sensitivity), 특이도(Specificity), 정확도(Accuracy) 및 일치도(Reproducibility)를 구하였다. 일치도는 Z-test를 시행하여 통계적 유의성을 평가하였다. 결과: 식도암의 CT에 의한 병기와 조직 병리 소견에 의한 병기의 일치도는 원발성 종양의 국소 침윤의 경우 0.32 (p<0.01), 림프절 전이에 대하여는 0.36 (p<0.01)이었으며, 원위부 장기에 대한 전이 여부에 대하여는 0.62 (p<0.01)이었다. 림프절 전이나 원거리 전이에 대한 CT와 조직 병리 소견의 일치도는 종양의 국소 침윤에 대한 일치도보다 우수하였다. 원발성 종양의 주변 장기 침습에 대한 CT의 정확도는 T1군(78.9%)과 T2군(62.3%)에 비해 T3군(65.8%)과 T4군(98.2%)에서 우수하였다. 또한 식도암의 국소 종양 침윤에 대한 CT진단은 각 병기별로 민감도에 비해 특이도가 높았다. 결론: 식도암의 병기 결정에 있어 CT 진단은 종양에 의한 식도 벽의 침습 정도를 파악하는 것보다 주위 조직이나 장기, 그리고 림프절의 전이를 파악하는데 더 유용함을 알 수 있었다. Background: The decision of staging of esophageal cancer have great effect on the resectability of the lesion and estimation of the patient's prognosis. Today, CT is one of the most popular modality for staging of esophageal cancer. However, it has some limitations because of false-positive or false-negative findings on cancer staging. The purpose of this study was to analyze the efficacy of CT in preoperative staging of esophageal cancer. Material and Method: We retrospectively analysed the difference of staging of esophageal cancer between CT and histopathological findings for the 114 patients with histologically proven esophageal cancer who underwent operation at the department of thoracic and cardiovascular surgery, Chonnam national university hospital, between January 1999 and June 2003. We evaluated the efficacy of chest CT in the staging of esophageal cancer compared to postoperative histopathologic findings by calculating sensitivity, specificity, accuracy, and reproducibility of chest CT to detect abnormality. Result: The reproducibilities between chest CT and histopathologic findings were 0.32 (p<0.01) for primary tumor (T), 0.36 (p<0.01) for lymph node invasion (N), and 0.62 (p<0.01) for distant metastasis (M). The reproducibilities between chest CT and histopathologic findings for lymph node invasion (N) and distant metastasis (M) were superior to that of primary tumor (T). The accuracy of primary tumor (T) was 65.8% and 98.2% in group III and IV, which was significantly higher than that of group I and II (78.9% and 62.3%). In general, specificity of chest CT for TNM staging was superior to sensitivity. Conclusion: In conclusion, preoperative CT scanning can provide important information on lymph node invasion and metastasis of lesion than primary tumor invasion.

1,200gram 미숙아에서 Type A 식도 폐쇄증의 식도 단단문합술 -1례 보고-

조삼현,오봉석,이동준,최영륜,Jo, Sam-Hyeon,O, Bong-Seok,Lee, Dong-Jun,Choe, Yeong-Ryun 대한흉부심장혈관외과학회 1997 Journal of Chest Surgery (J Chest Surg) Vol.30 No.2

긴 간격(longgap)의 A형 식도 폐쇄증을 가진 신생아의 치료는 복잡하고 아직까지 이견이 많아, 본래의 식도나 위, 소장, 대장 등을 이용한 치환술로 다양한 식도 재건술이 시행되고 있다. 저자는 long gap의 A형 식도 폐쇄증을 가진 재태기간 28주, 체중 1.2kg의 미숙아에서 식도 단단문합술을 시행하여 좋은 결과를 얻었기에 문헌고찰과 함께 보고하는 바이다. 1차 처치로 위루술를 하고 2차로 식도 단단문합을 시행하였다. 술후 제한된 문함부유출과 종격동염이 발생하였으나 흉관을 통한 적절한 배액(drainage)과 동시에 위루술을 통하여 문합부유출부위에 음압 (negative pressure)을 걸어 지속적 인 흘인(suction)으로 치료하여 호전되었다. 환아는 건강하게 퇴원하였으며 술후 4개월이 지난후 5.4kg으로 체중의 증가가 있었다. The management of neonate with long gap atresia without a fistula(type A) is complex and controversial. Various esophageal reconstruction include use of native esophagus or replacement with colon, stomach and small bowel. A severe premature male, at 28 weeks gestation weighing 1.2kg, was born with type A esophageal atresia in Chonnam University Hospital. Initial treatment consisted of gastrostomy under the local anesthesia and suctioning of proximal pouch, and than underwent delayed esophageal end to end anastomosis. A minimal leakage and mediastinitis ocurred postoperatively, but was treated by adequate drainage and negative suction from the leakage site through the gastrostomy. The patient was discharged in good general condition and normal weight of 5.4kg after 4 months after the surgery.