방사선사진의 인덱스-순서 분석을 통한 치아경조직의 탈염화 검출

박동현,박영호,김경숙,박정훈,이기자,최삼진,최용석,황의환,박헌국 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.2

Purpose : The purpose of this study was to develop the radiographic technique for detecting the demineralization which is known as indication of dental caries. Materials and Methods : This technique was based on the comparing of multiple radiographs which was irradiated by multiple X-ray spectra. For the meaningful comparing, the multiple radiographs were reconstructed to the dosimetrically consistent images using a standard material. The difference of resulting images of same target with multiple spectra represents the difference of response of material as regards the spectra. Results : We have found about 10% of demineralization of dental hard tissues particularly in the proximal region through the analyzing of differences. Conclusion : Most intriguing thing in this investigation was that the method to analyze difference shows us to an anatomic structure of dental hard tissues even if absolute values of optical density were excluded during the procedures.

40세 이하 관상동맥 질환자에서 장기적 임상 관찰

이승욱,정명호,박종철,박형욱,조상희,김원,김계훈,이상현,강경태,조장현,김남호,김건형,안영근,조정관,박종춘,강정채 全南大醫大 2001 전남의대학술지 Vol.37 No.2

사지의 급성동맥 색전증에 대한 응급동맥 색전제거술

박철완,원형섭,박정배,이근,조상훈,표창해,김상일 대한응급의학회 1996 대한응급의학회지 Vol.7 No.2

Acute arterial occlusion of the extremities is often a surgical emergency and is due mostly to arterial embolus. It has infrequently been reported in the emergency department. Cardiac embolism is most commonly the result of atrial fibrillation secondary to valvular heart disease followed by ischemic heart disease. The emergency arterial embolectomy by Fogarty balloon catheter works well when the cause of occlusion is cardiac embolus obstructing normal vessels in a patient with valvular heart disease. Recently we met some patients with acute critical ischemia of the extremities due to arterial emboli in our emergency department. On physical examination, they all had symptoms of 5"P"s(pain, pallor, pulselessness, paresthesia, paralysis). After emergency arterial embolect omy, immediate improvement was observed in all patients. They were discharged within 1 week. We report our experiences with the review of literatures.

악성 흉막삼출액에서 Bleomycin을 이용한 흉막유착설의 시술효과

박정현,김학렬,양세훈,정은택 圓光大學校 醫科學硏究所 2002 圓光醫科學 Vol.17 No.1

목적: 악성 흉막삼출액이 반복적이고 지속적으로 발생하는 경우, 호흡곤란, 흉통등의 증상을 유발시키므로 흉막경화제에 의한 흉막유착술을 시행할 수 있다. 흔히 사용되던 talc의 심각한 부작용이 보고되고 있고, doxycycline 주사제도 국내에서 발매되지 않고 있다. 이에 연자들은 항암제로 소개된 bleomycin을 이용한 흉막유착술의 단기와 중기효과, 부작용 및 생존율 등을 전향적으로 확인하였다. 방법: 2000년 1월부터 2001년 12열까지 원광대학교 부속병원에 내원하여 반복적이고 지속적인 악성 흉막삼출액으로 흉막유착술이 필요한 26명의 환자를 대상으로 특별한 전 처치 없이 bleomycin 60 unit를 식염수와 함께 흉강 내 주입 후, 1일 후의 흉관에 의한 배액량을 확인하고 부작용을 관찰하였으며, 1개월 후에 흉부 방사선상으로 재 저류 유무를 확인하였다. 또한 시술 반응군과 비반응군으로 나누어 중앙생존기간을 비교분석 하였다. 결과: 시술 1일 후 26예중 10예(38%)에서 배액이 없었고, 8예(31%)에서 배액량이 100ml이하였으며, 8예(31%)는 100ml이상이었으나 시술 전보다 감소하였으며 증가된 경우는 없었다. 유의할만한 부작용은 4예(고열 3예, 흉통 1예)에서 발생하였으나, 대증요업으로 조절되었다. 시술 1개월 후 흉부 방사선과 26예중 9예(35%)는 재 저류액이 없었고, 10예(38%)는 저류액이 있으나 시술 전보다 감소하였으며, 1예(4%)는 이전과 변화가 없었고, 6예(23%)는 시술 전보다 저류액이 증가하였다. 시술 후 단기 및 중기효과를 반응군과 비반응군으로 나누어 중앙생존기간으로 양군간을 비교하였을 때, 반응군에서 연장이 되었으나 통계적으로 유의한 차이는 없었다. 결론: 이상의 결과로서 bleomycin에 의한 흉막유착술은 다른 경화제보다 특별한 전 처치가 필요 없는 간편하고, 비교적 부작용이 적은 안전한 방법이며, 효과적인 치료성적을 보이는 시술로 사료된다. Background : Malignant pleural effusions are common and significant problems in patients with advanced malignancy. Repeated thoracentesis provides temporary symptomatic improvement, but most patients progressively cause dyspnea or pleuritic pain. So pleurodesis with sclerosing agent is effective as a palliative treatment. There are many drugs used as pleural sclerosing agents. But doxycycline hasn't been used in Korea since 1999. And recently talc has been reported serious side effects. In this study, pleurodesis with bleomycin was prospectively investigated for its short term and middle period effects and its side effects. Methods : Twenty-six patients with malignant pleural effusion were prospectively analyzed to estimate the effects of bleomycin pleurodesis. Without special management before the procedure, 60 units of bleomycin in 50-100ml of normal saline were instilled into the pleural space via a small bore catheter(8-10 F). Andthen repeated positional changes and rotations were done for 2 hours. We measured the drainage amount and evaluated the side effects after 24 hours and checked the existence of the effusion by chest radiography after 1 month. Results : After 24 hours, the drainage amount showed that the responder group(none or ≤ 100ml) was 69%, and that the nonresponder group(> 100ml) was 31%. Side effects (high fever in 3 cases and severe pleuritic pain in 1 case) were 15%(4/26), but patients recovered easily by symptomatic management. After 1 month, chest radiography showed that the response rate(complete or partial response) was 73%. Differences of survival times between responder and nonresponder group was not statistically significant. Conclusions : We are suggest that bleomycin as a pleural sclerosing agent is a relatively simple, safe and effective agent. But a prospective study with a larger number of patients must be warranted.

경안면 괴사성 근막염 : 증례보고

박관수,정기훈,김효언,정정권,윤규호,전인성 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.1

Necrotizing fasciitis is defined as infectious disease showing extensive necrosis of the superficial fascia with widespread involvement of the surrounding tissues and concurrent systemic toxicity. It is found commonly in the extremities, the trunk and the perineum, but shows extremely rare occurrence in the well vascularized area such as head and neck area. Occurred in the head and neck area, it is called "cervicofacial necrotizing fasciitis" (CFNF). It is a fatal disease which carries a mortality rate up to 60%. Early diagnosis, aggressive surgical debridement of necrotic tissues and massive antibiotics therapy are essential for achieving a favorable outcome. We present a case of cervicofacial necrotizing fasciitis in 35-year-old male patient with literature review.

저혈당을 동반한 자가면역 인슐린 증후군 2예

박시형,이신원,정귀화,최창훈,이순희,한정훈,김정국,하승우,김보완 대한내분비학회 2001 Endocrinology and metabolism Vol.16 No.4-5

濟州地方에서 감자栽培法 改善에 關한 硏究 : Ⅱ. 욕광處理後 定植期가 겨울감자의 生育 및 收量에 미치는 影響 Ⅱ. Effect of Planting Time on Growth and Yield of Winter Cultivated Potato

朴庸奉,宋昌訓,文禎洙,韓元琢 제주대학교 1991 논문집 Vol.33 No.-

겨울감자 비닐하우스를 利用한 4月달 出荷가능성을 검토코져 定植期를 달리한 試驗에서 아래와 같은 결과를 얻었다. 1) 3∼4月 早期 出荷를 위한 겨울감자 비닐하우스 定植時期는 11月 하순부터 12月 上旬이었다. 2) 定植期 萌芽長은 早期定植 할수록 芽長이 짧고 莖數가 적었다. 3) 地上部 生育에서 草長은 對照區에 比하여 11月下旬 早期定植區는 2㎝ 정도 짧았으나 莖이 굵고 강건한 傾向을 보였다. 4) 收穫時期別 10a當 收量은 3月下旬 早期收穫時 對照區에 比하여 11月하순부터 12月상순 定植區는 76∼32%, 12月 中旬 定植期는 13% 各各 增加하였다. This study was carried out to investigate the possibility of April consign when the planting date was different. the results obtained are summarized as follows: 1) The planting date for earlier consign of March, from April, was between the end of November and early of December. 2) According to the planting date, the earlier the planting, the shorter the bud length and the smaller the bud number. 3) Incase of above-ground growth, the height of a potato planted at the end of November was shorter than that of the control. Moreover, the stem was a so thick and steady. 4) In case of harvest at the end of March, yields per 10 a by harvesting time was the trend in comparison with the control. For example, from the end of November to early December, 76-32% and middle of December, 13%

인공 치아우식 발생 모델에서 디지털 방사선 공제술을 이용한 인접면 치아우식증의 진단

박정훈,최용석,황의환,이기자,최삼진,박영호,김경숙,진현석,홍경원,오범석,박헌국 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.1

Purpose : The purpose of the experiment was to evaluating the diagnostic ability of dental caries detection using digital subtraction in the artificial caries activity model. Materials and Methods : Digital radiographies of five teeth with 8 proximal surfaces were obtained by CCD sensor (Kodak RVG 6100 using a size #2). The digital radiographic images and subtraction images from artificial proximal caries were examined and interpreted. In this study, we proposed novel caries detection method which could diagnose the dental proximal caries from single digital radiographic image. Results : In artificial caries activity model, the range of lesional depth was 572-1,374 μm and the range of lesional area was 36.95-138.52mm². The lesional depth and the area were significantly increased with demineralization time (p<0.001). Furthermore, the proximal caries detection using digital subtraction radiography showed high detection rate compared to the proximal caries examination using simple digital radiograph. Conclusion : The results demonstrated that the digital subtraction radiography from single radiographic image of artificial caries was highly efficient in the detection of dental caries compared to the data from simple digital radiograph.

Pleomorhic Xanthoastrocytoma 1예

박상덕,이훈갑,이기찬,주정화 대한신경외과학회 1982 Journal of Korean neurosurgical society Vol.11 No.4

A case of pleomorphic xanthoastrocytoma of the temporal lobe in a 27 year-old man who had severe frontal headache and diplopia is presented. Brain computed tomographic scan revealed a relatively well demarcated, slightly hyperdense mass with cyst surrounding low density in left temporoparietal area. After contrast enhancement, the mass is highly enhanced. The graish-brown, highly vascular mass was totally removed. Despite of their highly pleomorphic and bizzarre cytology, which suggests a malignant behavior, these tumors appear to have a relatively favorable prognosis.

영상의 특성에 적응적인 웨이브렛 대역 분할 기법

박정호,황병하,최재호,곽훈성 全北大學校 1996 論文集 Vol.42 No.-

The recent attention of image coding community is paid to wavelet transform, which is of interest for the nonstationary signal analysis because it provides good localization in time and frequency. There are two directions of study in decomposing an image by wavelet transform, that is octave form and wavelet packet. Of this, wavelet packet works adequately for all images with various properties, but it has a difficulty of requiring relatively massive processing time. This paper proposes an adaptive wavelet band decomposition scheme considering image properties to obtain an image coding gain by minimizing the entropy of each band. Simulation result shows that our scheme gets the same band decomposition form comparing to that of the Vetterli's optimal wavelet packet method when images with various properties are tested. Furthermore, the processing time of our scheme is superior to that of Vetterli's, about 8∼10 times.