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간장 및 담도 : 간농양 치유 후 추적 영상진단상 이상 소견을 나타내는 간농양의 조직병리학적소견
이동기(D . K . Lee),김원호(W . H . Kim),한광협(K . H . Han),최흥재(H . J . Choi),박찬일(C .I . Park) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.1
N/A Medical therapy is standard for intrahepatic abscess and generally effective, but frequently radiologically abnormal lesion persist for long time followed by ultrasonography(US) or abnormal C-T, even after successful medical treatment including aspiration and complete clinical recovery. To access the histologic features of medically healed abscess but not disappeared completely in follow-up US or ahdominal C-T we performed liver biopsies in 5 cases of healed liver abscesses. The biopsy specimens were obtained at the margin of the lesions by cutting needle with ultrasono- graphic guiding. The biopsies were performed one time in one patient at variable period after treatment, 4 weeks in 2 cases, 6, 12 weeks & 17 months in each one case. The lobular architecture of the liver was relatively well preserved except the 2 specimens obtained at 4 weeks after treatment. And the specimens within 2 months showed hemorrhagic features rather than inflammatory, such as central hemorrhagic necrosis with extravasation of RBC. The sinusaidal system was dilated slightly. Some fibrosis involving portal tract and parenchyme of the liver was noted in the specimen of 6 weeks and 12 weeks. The specimen obtained at 17 months after treatment showed nearly normal liver architecture except minimal infiltration of lymphocyte in portal tract and parenchyme. Therefore, we concluded that in completely healed liver abscess, enen if abnormal reaiologic lesion persist for long time, the histologic feature of the lesion showed some hemorrhagic necrosis and infiltration of chronic inflammatory cells.
박찬일(C.I.Park),이장무(J.M.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
Gear vibration is caused by the mesh stiffness, gear accuracy, and assembling errors. For these reasons, helical gear has the axial, radial, and rotational vibrations. In this study, the mesh stiffness is calculated by considering the tooth bending, contact, and foundation deformations. Rotational vibration of helical gear with tooth error is modeled by 1 DOF vibration equation and is analyzed numerically. Also, by a specially designed experimental set-up, the results of analysis are cross-checked and the vibration characteristics of helical gear are discussed.
식도에 발생한 원발성 Small Cell Carcinoma - 보고 -
박찬일(C I Park),김충배(C B Kim),최일섭(I S Choi),홍인철(I C Hong),김주항(J H Kim),이두연(D Y Lee) 대한소화기학회 1986 대한소화기학회지 Vol.18 No.1
The primary small cell carcinoma of the esophagus is very rare malignant disease. McKeown described if first 2 cases at 1952 and about 70 cases were reported thereafter. This tumor is indistinguishable clinically from the squamous cell carcinoma but it is more aggressive than that. It is easily diagnosed with the light microscope and the pulmonary lesion should be ruled out. And it is confirmed by detection of neurosecretory granule under the electron microscope or cytoplasmic argyrophilia with the Grimelius stain. The choice of treatment is the chemotherapy but the surgery or radiationtherapy is indicated in bulky tumor. The prognosis is extremely poor and the most cases were not survived 1 year. We experienced a case of primary small cell carcinoma of the esophagus at Severance Hospital Yonsei University College of Medicine.
박찬일(C.I.Park),이장무(J.M.Lee) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
The purpose of this study is to develop a computer simulation program for analyzing load transmission characteristics of a helical gear system in design stage. In this analysis, the transmission error,<br/> load distribution, root stress, and contact area are. investigated. That is, the influence function of deflection are obtained by finite element analysis and the influence function of approach and gear tooth error are considered. Load distribution, transmission error, and contact area are calculated by solving load-deflection equation which includes the these influence functions and tooth error and the influence function of bending moment are obtained by finite element analysis and root stress is calculated by the load distribution and the influence function of bending moment. The results of the simulation are cross-checked through a specially designed experimental set-up.
권혁진,박찬옥,박찬일,여창훈,이장우,홍지룡,Kwon, H.J.,Park, C.O.,Park, C.I.,Yeo, C.H.,Lee, J.W.,Hong, J.R. 한국화재조사학회 2008 한국화재조사학회 논문지 Vol.11 No.1
각종 화재사고 분류 중 대표적으로 나타나는 가스사고는 그 형태와 원인이 다양하다고 할 수 있다. 가스사용량은 사용가구수가 증가와 사용 장소 및 가스기기의 다양화로 증가하고 있으며, 2007년도 가스사용량은 35,078천톤으로서 연평균 9.4%증가하였다. 가스사고는 95년 557건을 최고로 하여 2007년도에는 123건 발생하여 연평균 11.5%감소되었다. 가스의 종류에 따른 사고건수는 LP가스의 경우 전체 가스사고중 약 80%를 차지하고, 도시가스와 고압가스가 약 20%를 차지하고 있다. LP가 많았고, 특히 공급자부주의에 의한 사고가 끊이지 않고 증가하고 있는 추세이다. 가스사고는 사용자취급부주의, 공급자 취급부주의, 시공불량 및 노후제품으로부터 사고가 발생하여 인명과 재산피해가 발생하고 있다. 본 논문에서는 가스사고의 분류와 형태별, 원인별, 지역별 등에 대한 사고분포를 통해 가스사고의 원인에 대한 이해를 하고 가스안전사고를 예방하는 자료로 활용되도록 하였다. Among the various cases of fire accident, gas accident which is roost essential have a lot of forms and causes. The quantity consumed of gas is increasing because of increment of gas-using families and variations of gas machinery. The quantity consumed of gas in 2007 was 35078 tons and the average rate of increasement was 9.4%. The amount of gas accident was on the peak at 1995 when 557 accidents occurred in a year. In 2007, 123 gas accidents was occurred and the average rate of diminution was 11.5%. Accidents by LP gas took 80% of the whole accident and city gas and high pressure gas took 20%. In case of LP gas, accidents were usually occurred because of lack of blocking after the removal of gas machinery and moveable butane burner. Especially, the accidents cause by carelessness of a provider is increasing. Gas accidents which generate damage of human life and property, are caused by users' carelessness, providers' carelessness, inferiority of structure and old products. In this thesis, We will classify the gas accidents. Furthermore through the classification of accidents by forms, causes and regions, this thesis going to be a reference to understand and prevent the accidents.
CFG, 라이브러리 정보를 이용한 권한 기반 안드로이드 악성코드 탐지 기술의 성능 향상
박건우,Tamer AbuHmed,민대홍,양대헌,이경희 한국차세대컴퓨팅학회 2019 한국차세대컴퓨팅학회 논문지 Vol.15 No.6
In this paper, we propose a static Android malware detection technique to improve the detection performance and reliability. Based on the permission feature which is heavily used in the previous works, we additionally use the library dependency and control flow graph (CFG) as features for improving our detection performance. Library dependency and CFG-based features are efficient to detect Android malware, which is obfuscated using renaming technique because these are extracted by structural analysis. By combining these three features, we propose a novel malware detection model using bidirectional long short-term memory. As results, we achieved 99.62% overall detection rate. Our model is highly reliable: where the precision, recall and F1 scores are 100%, 99.26% and 99.62%, respectively. 본 논문에서는 안드로이드 악성코드의 증가 추세에 대응하여 향상된 성능의 정적 악성코드 탐지 기법을 고안하였다. 기존의 어플리케이션의 권한을 특징(feature)으로 사용하는 악성코드 탐지 기법에 라이브러리 사용 정보와 control flow graph (CFG)의 속성을 특징으로 추가하여 성능을 향상시켰다. 또한, 라이브러리와 CFG는 구조 분석을 통해 특징을 추출하므로 리네이밍(renaming) 난독화에 대하여 독립적이라는 특징이 있어 난독화에 취약한 권한 사용 탐지 기법을 보완하는 추가적인 이점을 가진다. 어플리케이션으로부터 추출한 세 가지 특징을 기반으로 양방향 장단기 기억 네트워크(bidirectional long short-term memory)를 이용한 악성코드 탐지 모델을 제안하였다. 세 가지 특징을 모두 사용한 악성코드 분류 모델을 안드로이드 악성코드와 일반 어플리케이션을 합친 데이터에 적용하였을 때 정확도 99.62%, 정밀도 100%, 재현율 99.26%, F1 99.62%로 높은 성능과 신뢰도를 보였다.