폐회로 디젤기관의 모니터링 및 제어를 위한 시뮬레이션 기법에 관한 연구

유춘식 호남대학교 산업기술연구소 1996 산업기술연구논문집 Vol.3 No.-

이 논문에서는 수중 동력용 폐회로 추진시스템에 있어서 산소와 비열비를 모니터량 및 제어하기 위해서 마이크로프로세서를 사용한 하드웨어를 설계하였으며 최적의 제어소프트웨어를 사용한 시뮬레이션기법을 검토하였다. In this paper, a hardware using microprocessors has been designed in order to monitor and control the oxygen and ratio of specific heat in the closed-cycle propulsion system for underwater powerplants. The author examined the simulation technique which imposes an optimal control software.

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.

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.

한국어 대용량 음성인식에서의 효율적인 시간 감축에 관한 연구

장춘서,이기수,신윤식,임은기,김병만,김현수 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-

In this paper a time reduction algorithm for large vocabulary speech recognition system has been studied. TDNN(Time Delay Neural Network) was used to classify vowel using phonetical fetures. To increase performance of vowel classification, modular TDNN architecture associated with 2 states input layer has been suggested.

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.

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.

사염화탄소로 유발된 간손상에서의 효소 활성도의 변화로 본 홍화자 분획물의 간손상 보호 작용

정춘식,정기화,정정숙 德成女子大學校 藥學硏究所 1999 藥學論文誌 Vol.10 No.1

본 연구소에서는 사염화탄소로 유발된 간손상에 대한 홍화자 메탄올 추출물과 이를 계통 분획한 분획물의 보호 효과를 이미 보고하였다. 본 실험에서는 혈장과 조직 생화학적 분석으로 홍화자 분획물의 간보호 효과를 확인하며, 간보호 작용에 대한 기전을 살펴보기 위하여 약물 대사 효소에 미치는 영향을 측정하였다. 홍화자 butanol subfractions 중 BS-5 분획물은 CCl_4로 간손상을 유발시킨 흰쥐에서의 혈장 ALT와 AST 활성과 간조직 중 cholesterol and triglyceride를 감소시켰으며, 이러한 BS-5 분획물의 CCl_4로 유발된 간손상에 대해 보호 작용은 cytochrome P450 감소와 glutathione S-transferase의 활성 증가에 기인된 것으로 생각된다. Previous studies have shown that methanol extract and its butanol fraction of Carthamus tinctorius L. Semen have the hepatoprotective effect on the CCl_4-induced hepatotoxicity. The hepatoprotective effect of subfractions has been evaluated by analyzing blood and hepatocyte biochemical analyses and biotransformation enzyme analyses. Treatment of BS-5 subfraction has significantly decreased the activities of alanine aminotransferase and aspartate aminotransferase. In addition, the levels of cholesterol and triglyceride in liver have been decreased as compared with that of CCl_4 treated rats. The hepatoprotective effect of BS-5 subfraction on the CCl_4-induced hepatotoxicity would be mediated of the attenuation of the level of cytochrome P450 and the enhancement of the activity of glutathion S-transferase.

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.

Delire I, <Je> 이접의 복화술

최춘식 釜山外國語大學校 1998 外大論叢 Vol.18 No.3

Delire I, le texte de la confession du drole du menage, se devise en deux espaces qualifies du Je. L'un est l'espace passif de la <Vierge folle>, compose des isotopies/masochisme/ et /regression/. L'autre est l'espace aggresif de <l'Epoux infernal> compose des isotopies /agression/ et / ouvert/. En conclusion, le locuteur de Delire I traduit le dialogue du Je avec lui-meme a la faveur de la disjonction qu'il ressent a l'interieur de son etre. <La Vierge folle> et <l'Epoux infernal> pourraient etre une representation double de l'Ego et le drole menage serait alors interprete comme une figuration de la dualite ontologique, des deux actants qui habitent le moi.