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.

전단파괴된 제방의 보강공법 비교 연구

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

This study suggests the most reasonable analytical and reinforcement methods for possible collapse of underground caused by levee construction on the soft ground. We inspected stability of levee in the field where heaving caused by sliding had occurred. We applied three reinforcement methods: Surcharge method, Sand Compaction Pile method, and Deep mixing method, all of which met the allowable safe factor. However, Surcharge method requires great amount of costs for land compensation and Sand Compaction Pile method had disadvantages of higher construction cost and instability of levee caused by vibration. Therefore, Deep mixing method is considered the most proper method.

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.

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.

평면변형률 압축시험에 의한 입상체의 강도이방성

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.-

Anisotropy in strength and deformation characteristics of isotropically consolidated sands prepared by pluviating through air was studied by plane strain compression tests. Seven types of sand of the world-wide origins were tested, which have been extensively used for research purposes. The strains for direction of maximum principal stress and direction of minimum principal stress were measured continuously from 10(-6) to 10-². The following results common for all sands were obtained. The behaviour at strains less than about 0.001% was elastic and isotropic regardless of the angle δ of the σ₁ direction relative to the bedding plane. However, the sands became gradually more anisotropic as the strain increased exceeding the elastic limit. The peak strength was noticeably anisotropic with a similar trend that the angle of internal friction φ decreased as δ decreased from 90°, and the ratio of the smallest to largest values of φ was between 0.982 and 0.90. The φ has a minimum at δ=0°∼30 depending on the types of sand. The residual strength became isotropic again.

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).

NATM 터널간의 굴착거리에 따른 터널 거동에 관한 연구

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

This thesis studied the behavior of tunnels according to the change in the excavation distance during the additional construction of NATM tunnels. The Finite Difference Method was employed to analyze the crown settlement, the horizontal convergence, and the axial force of rock bolts, extending the distance between the tunnels up to five times as long as the diameter of tunnel. It turned out that the crown settlement, the horizontal convergence, and the axial force of rock bolts became decrease as the distance between the tunnels became farther, and that they converged when the distance between the tunnels was over 3D.

지하수위 고려방법에 따른 사면안전율의 비교연구

박춘식,장정욱,장일석 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-

This study examined soil parameters, existence of ground water, and the safety factors of slope according to the ground water level. The following are the conclusions of the study. (1) The safety factor became less as the ground water level decreased. (2) The greater the cohesion became, the less the safety factors according to the ground water level did. (3) In the case with ground water, greater cohesion had less effect on the safety factor. However, in the case without ground water, changes in cohesion had considerable effects on the safety factor. (4) While the safety factor increased associated with increase in the angle of shear resistance as the ground water level, the safety factor according to cohesion was almost constant.

사면안정 해석방법의 차이에 의한 안전율의 비교 연구

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

This study performed slope stability analysis by changing analysis methods and shear strength with the slope stability analysis program. The conclusions of the study are as follows. 1) The safe factor of clayey soil applied with Bishop's simple method turned out to be similar to or slightly higher than those of other methods, for both dry and saturated conditions. 2) The safe factor of sandy soil applied with GLE method turned out to be slightly higher than those of other methods. But when applied with Bishop's simple method, it appeared to be slightly higher than those of other methods. 3) The safe factor of ordinary soil applied with GLE method showed the highest result. 4) Janbu method showed the lowest safe factor among all the methods for the above three types of soils.

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.