젊은 남자에게 발생한 통상성 간질성 폐렴과 동반된 폐암 1예

박종숙,이준혁,박성우,장안수,박춘식,박재성,백상현,고은석,신화균 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Usual interstitial pneumonia(UIP) is relatively rare disease of lung parenchyme under the age of 50. Lung cancer is reported to occur as a complication of UIP, but has not been reported in young age patient with UIP in Korea. A 35-year-old man was admitted to the hospital because of dyspnea, cough and mild fever. He had been suffered from dyspnea during 3 years. The dyspnea worsened recent 1 month ago. He had been treated with pneumonia at another hospital during 4 months before this admission. Chest radiographs and High resolution CT showed subpleural and basal dominant reticular opacities in both lung with no change until now. He was smoker and his occupation was car engine-man dealing with benzene. UIP is suspected by history and radiologic findings. Operation for open lung biopsy was performed to obtain lung specimen via video-assisted thoracoscopic surgery. Patient's pathologic examination showed UIP combined with adenocarcinoma in RLL superior segment and posterobasal segment and RLL lobectomy was done. After operation, the patient has been in cancer free condition so far. We report a case of UIP combined with lung cancer in young man with brief review of the literature.

교대의 조시시공을 위한 단계별 성토고 결정에 관한 연구

박춘식,장정욱,김종환 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

This study suggests solutions to the problem of consolidation settlement or lateral movement, which may occur when roads or civil structures are constructed on soft clay. It also presents a proposal to determine appropriate height and time of embankment for early construction of abutment, on the basis of soil parameters in terms of reverse analysis. The following shows the summary of the study. (1) The Hyperbolic method was applied to the field measurement to compute a predictable final settlement. (2) The field measurement was analyzed by Asaoka method and a reverse analysis was carried out on the coefficient of consolidation of the vertical drain method. (3) The target amount of settlement was determined by the try and error method, which considered consolidation settlement to form the planned height. (4) Appropriate heigh and time of stepped embankment was determined to reach the target amount of settlement. (5) Slope stability of the step embankment was examined.

평면변형률압축시험에 의한 각종 모래의 전단강성계수의 이방성

박춘식 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-

공중낙하법에 의해 만든 등방압밀 모래 공시체를 미소변형률 측정장치를 사용한 평면변형률압축시험을 실시하여 미소변형률에서 파괴 후까지의 전단강서계수에 대한 이방성을 연구하였다. 세계 각국의 주요 연구기관에서 사용되고 있는 7종류의 연구용 표준사 공시체를 멤브레인의 관입에 의한 오차와 변위를 외부에서 측정함으로 하여 생기는 오차(bedding error) 등의 영향을 제거하여 측정한 최대주응력방향의 변형률과 최소주응력방향의 변형률을 각각 0.0001%에서 10%까지 넓은 범위에 걸친 응력-변형률 관계를 얻었다. 그 결과 최대전단강성계수 Gmax는 모래의 종류에 따라 달랐다. 또, 전단강성계수의 변형률 수준과 응력 수준에 대한 의존성은 δ가 감소함에 따라 증가하였다. Anisotropy of stiffness, from extremely small strains to post-failure strains, of isotropically consolidated air-pluviated sands in plane strain compression was studied by using the newly developed instrumentation for small strain measurements. Seven types of sand of the world-wide origins were tested, which have been extensively used for research purposes. Stress-strain relationships for a wide range of strain from about 0.0001% to 10% were obtained with measuring axial and lateral strains locally free from the effects of bedding and membrane penetration errors at the specimen boundaries. It was found that the maximum shear modulus Gmax was irrespective of the angle δ of the б1 direction relative to the bedding plane. However, the normalized Gmax was varied with the types of sand. Furthermore, the dependency of the strain and stress level on the stiffness was increased as δ decreased.

구속압 및 과압밀비가 점성토의 변형·강도특성에 미치는 영향]

박춘식,장정욱,최차석 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

The purpose of this study is to investigate the deformation and strength characteristics of clay by confining pressure and O.C.R by triaxial compression test. The results are shown as follows. 1)In normally consolidated clay soil of confining pressure, the more σ₃is increased, the more internal friction angle is decreased. 2) Within 0.3~4.0kgf/㎠ range of σ₃, internal friction angle has shown confining pressure about 5~6˚. 3)A point of destory, pore-pressure moduls is increased as σ₃is getting increase.

평면 변형률 압축상태에서의 모래의 미소거동

박춘식 國立 昌原大學校 産業技術硏究所 1995 産技硏論文集 Vol.9 No.-

It has been demonstrated in plane strain compression tests performed on dense Toyoura and Silver Leighton Buzzard sand, that the newly developed instrumentation for small strain measurements was capable of measuring the altering stiffness of sands for a wide range of shear strain from 10?? to 10??. It was found that for the range of shear strain (??) from 10?? to those at peak, the Rowe's stress-dilatancy relation seemed to be a good approximation for Toyoura sand Silver Leighton Buzzard sand. However, the value of K and Poisson's ratio(at elastic range: ??) varied with sand types. It was also found that the value of ?? and stress-dilatancy relation was irrespective of overconsolidation ratio(OCR).

경남 창녕지역 절취사면의 붕괴 및 보강대책에 관한 사례연구

박춘식,장정욱,이진권 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

1) The objective of this study is to acquire stabilization of collapse of cut-slope in Chang-Nyung, Gyeong-Nam. The following shows the results of this study. 2) We applied a reinforcement method with the latticed beam (0.50X0.50) + permanent anchor (PC 6XΦ12.7mm, Ta = 50.0t/EA, etc 3.0m), and fill gravels(D=35cm) in the latticed beam. 3) We attenuated the slope (1:20.), and stabilized the slope pace by ASANA method. 4) We planned a drainage way(U-type, 0.40X0.40) in order to prevent surface water from inflowing into underground.

경사하중이 작용하는 연약지반의 압밀침하 산정에 관한 연구

박춘식,장정욱,김범수 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

This study determined consolidation settlement in soft ground with the tilted load by means of Terzaghi's one-dimensional consolidation theory and FEM. It was also compared with field measured value. The conclusions are summarized in the following. ⅰ) The consolidation settlement from Terzaghi's one-dimensional consolidation theory differ considerably from the measured value, but showed almost similar to that from FEM. ⅱ) Terzaghi's one-dimensional consolidation theory showed variable consolidation settlement according to methods to obtain △P. ⅲ) Consolidation settlement determined by FEM turned out to better evaluate the field settlement than Terzaghi's one-dimensional consolidation theory.

하천제방의 차수벽 심도 결정에 관한 해석적 연구

박춘식,장정욱,강남욱 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

This study examined the safety factors of piping according to changing in the heights of levee and water level and the slope gradient. We also examined the safety facotors after installing the cut-off wall in unsafe cases. The following are the results of this study. (1) In cases of levees with the same slope gradient, the appropriate depth of the cut-off wall became deeper as the heights of levee and water level rised. (2) When the heights of levee and water level were set constant, the appropriate depth of the cut-off wall became shallower as the slope became steeper. The slope gradient became less effective as the depth of the cut-off wall became deeper. (3) When the levees height was constant, there was a tendency for hydraulic gradient to decrease almost in the same rate as the height of water level became lower by 1m. (4) To determine the depth of the cut-off wall, the effects of the heights of the levee and water level turned out to be greater than the effect of slope.

평면변형압축시험에 의한 각종 모래의 변형특성 이방성

박춘식,황성춘 國立 昌原大學校 産業技術硏究所 2000 産技硏論文集 Vol.14 No.-

공중낙하법에 의해 만든 등방압밀 모래공시체를 미소변형률 측정장치를 사용한 평면변형률압축시험을 실시하여 미소변형률에서 파괴후까지의 강성률에 대한 이방성을 연구하였다. 세계 각국의 주요 연구기관에서 사용되고 있는 7종류의 연구용 표준사 공시체를 멤브레인의 관입에 의한 오차와 변위를 외부에서 측정함으로 하여 생기는 오차(bedding error) 등의 영향을 제거하여 측정한 최대주응력방향의 변형률과 최소주응력방향의 변형률을 각각 0.0001%에서 10%까지 넓은 범위에 걸친 응력-변형률 관계를 얻었다. 그 결과 최대 영률 ??은 퇴적면과 최대주응력 σ₁이 이루는 각도 δ에 관계없이 일정하였다. 그러나, 정규화한 ??은 모래의 종류에 따라 달랐다. 또, 강성률의 변형률 수준과 응력 수준에 대한 의존성은 δ가 감소함에 따라 증가하였다. Anisotropy of stiffness, from extremely small strains to post-failure strains, of isotropically consolidated air-pluviated sands in plane strain compression was studied by using the newly developed instrumentation for small strain measurements. Seven types of sand of the world-wide origins were tested, which have been extensively used for research purposes. Stress-strain relationships for a wide range of strain from about 0.0001% to 10% were obtained with measuring axial and lateral strains locally free from the effects of bedding and membrane penetration errors at the specimen boundaries. It was found that the maximum Young's modulus ?? was irrespective of the angle δ of the σ₁direction relative to the bedding plane. However, the normalized ?? was varied with the types of sand. Furthermore, the dependency of the strain and stress level on the stiffness was increased as δ decreased.

실내요소시험에 있어서 공시체와 단면과의 마찰경감에 관한 연구

박춘식 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-

In order to find the proper composition of lubrication layer to be used for element tests of granular materials in the laboratory, a series of direct shear tests between a granular material specimen and a lubrication layer was performed. The granular materials used ranged from a fine sand to a gravel with D50=0.16mm∼1.85mm. The lubrication layer consisted of a layer of silicone grease and a latex rubber disk, and its variations. Based on the test results, the following points are shown: For Silver Leighton Buzzard Sand(D50=0.62mm) and Hime Gravel(D50=1.85mm), a proper amount of powder should be added to the original grease in order to improve the quality of lubrication by preventing the squeezing out of grease from the places of stress concentration in the proximity of particles indenting the lubrication layer. At the same time, the amount of powder should not be too much in order not to increase the shear resistance of a mixture of grease and powder. Fly ash is suggested as a proper type of powder. By this method, even for Hime gravel, a low value of φμ of around 0.8 degrees at normal stress of 1.5∼70.kgf/㎠ can be obtained.