• 한국기계가공학회지
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• 제11권4호
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• pp.154-159
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• 2012

Condition monitoring(CM) is a method based on Non-destructive test(NDT). Therefore, recently many kind of NDT were applied for CM. Acoustic emission(AE) is widely used for the early detection of faults in rotating machinery in these days also. Because its sensitivity is higher than normal accelerometers and it can detect low energy vibration signals. A machine tool consist of many parts such as the bearings, gears, process tools, shaft, hydro-system, and so on. Condition of Every part is connected with product quality finally. To increase the quality of products, condition monitoring of the components of machine tool is done completely. Therefore, in this paper, acoustic emission method is used to detect a machine fault seeded in a gearbox. The AE signals is saved, and power spectrums and feature values, peak value, mean value, RMS, skewness, kurtosis and shape factor, were determined through Matlab.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.581-586
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• 2014

In general vibration test considers both harmonic vibration and random vibration, When developing the vehicle component. But the effect of harmonic vibration is larger in the parts around the vehicle engine, sole testing the harmonic vibration is considered. In this study, the fatigue damage of the linear system fixed around the engine is analyzed when the effect of random vibration is higher, harsher than the normal road surface condition. In condition the vehicle speed and the engine RPM are similar, the higher the harshness of the road surface condition is, the larger the fatigue damage level is. Therefore both random vibration and harmonic vibration must be considered in vibration test of components around the engine. Proposing the sine on random(SOR) vibration test that can exam considering both of vibrations, harmonic and random.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 춘계학술대회 논문집
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• pp.589-597
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• 2000

This paper deals with the basic design of the traction motor(TM) by performing the train performance simulation(TPS). The TPS, considering min condition, provides some important information about selecting the latins of TM such as current, power and frequency, etc. Especially, calculating the current flowing into the TM by the TPS in the situation of normal condition and M-car cut out respectively, we can inspect whether the TM endures thermally under the contingency or not. This paper reviews the tractive effort of the train to meet the demands of consumer and then designs the TM electrically. finally, performing the TPS under emergency condition, it checks the thermal capacity of the TM to insure the justice of the TM under construction.

• 사상체질의학회지
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• 제14권3호
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• pp.17-32
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• 2002

Objectives ; A Supplementary Study for Sasangin Identifing is based on Chapter Pathophysiology Part V of [Donggyi Soose Bowon Chobonguan]. And I try to explain that with Sasang Constitutional Theory. After all I want this study given the basis of 'The Guideline of Sasangin's Diagnosis & Treatment(GSDT)'. Methods ; First, I divid ${\ulcorner}$part V${\lrcorner}$ into 4 cartegories (Normal Condition, Abnormal Condition, good or bad Condition, Better or Worse Condition). And then each symtom is analyzed by Sasang Constitutional Medicine(SCM). Conclusions; I am sure that it gives the first step toward Indentifying Sasangin of [Donggyi Soose Bowon]. All of Sasangin Identifing Supplementary are analyzed by SCM. They are divided the identifing for Sasangin classification and Sasangin diagnosis of the disease. And this study will give the basis of ‘GSDT’.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2003년도 유체기계 연구개발 발표회 논문집
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• pp.496-501
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• 2003

Reynolds averaged Wavier-Stokes simulations based on the Reynolds stress model was performed to investigated the effect of inlet flow angle on the distributions of the Reynolds stress tensor inside tip leakage vortex of a linear compressor cascade. Two different inlet flow angles ${\beta}=29.3^{\circ}$(design condition) and $36.5^{\circ}$(off-design condition) were considered. Stress tensor analysis, which transforms the Reynolds stress into the principal direction, was applied to show an anisotropy of the normal stresses. Whereas the anisotropy was highest in the region where the tip leakage vortex collides the suction side of the blade and tip leakage flow enters between blade tip of the pressure side and the endwall, it had the lowest value at the center of tip leakage vortex. It was also found that the magnitude of maximum shear stress at design condition was greater than that of off-design condition.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제6권4호
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• pp.288-292
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• 2006

Many authors have studied several concepts of fuzzy systems. Balasubramaniam and Muralisankar (2004) proved the existence and uniqueness of fuzzy solutions for the semilinear fuzzy integrodifferential equation with nonlocal initial condition. Recently, Park, Park and Kwun (2006) find the sufficient condition of nonlocal controllability for the semilinear fuzzy integrodifferential equation with nonlocal initial condition. In this paper, we study the existence and uniqueness of solutions for the semilinear fuzzy integrodifferential equations with nonlocal condition and forcing term with memory in $E_{N}$ by using the concept of fuzzy number whose values are normal, convex, upper semicontinuous and compactly supported interval in $E_{N}$.

• 대한수학회지
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• 제44권4호
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• pp.809-822
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• 2007

Certain weak type endpoint estimates are established for maximal commutators generated by $Calder\acute{o}n-Zygmund$ operators and $Osc_{exp}L^{\gamma}({\mu})$ functions for ${\gamma}{\ge}1$ under the condition that the underlying measure only satisfies some growth condition, where the kernels of $Calder\acute{o}n-Zygmund$ operators only satisfy the standard size condition and some $H\ddot{o}rmander$ type regularity condition, and $Osc_{exp}L^{\gamma}({\mu})$ are the spaces of Orlicz type satisfying that $Osc_{exp}L^{\gamma}({\mu})$ = RBMO(${\mu}$) if ${\gamma}$ = 1 and $Osc_{exp}L^{\gamma}({\mu}){\subset}RBMO({\mu})$ if ${\gamma}$ > 1.

• 해양환경안전학회지
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• 제21권6호
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• pp.637-644
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• 2015

항내 정온도 평가는 이상파 및 평상파 조건에 대해 수행이 되어야 하나, 어항개발 시 이루어지는 평가는 이상파에 대해서만 수행되고 있다. 축산항, 교암항, 궁평항 및 시산항에 대한 사례를 통해 해역이용협의 시 정온도 평가에 대한 실태를 분석하였다. 대상항 모두 이상파에 대한 항내 정온도를 평가를 수행하였으나, 목표 정온도를 만족하지 못하였다. 평상파에 대한 정온도는 가동률로 평가하며, 가동률을 평가하기 위해서는 장기간의 파랑관측이 필요하나 수행되지 않고 있었다. 가동률에 대한 평가는 계획의 적정성과 관련 있는 평가항목이기 때문에 개발로 인한 해양환경에 미치는 악영향을 최소화할 수 있는 계획의 수립과 어업인들의 정주환경 개선을 평가하기 위해서는 수행이 필요하다. 정온도 평가를 위해서는, 정온도 평가에 대한 이해가 선행되어야 하고, 장기간의 파랑관측이 수행되어야 하며, 평상파 및 이상파에 대한 평가절차를 명확히 해야 한다. 그리고 실효적인 계획이 수립될 수 있도록 조석정보와 같은 파랑정보의 제공 및 정온도를 평가할 수 있는 가이드라인의 수립이 필요하다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제1권1호
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• pp.32-35
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• 1996

Amoving aeration-membrane (MAM) bioreactor was employed for the production of 2$\mu$g/mL of tissue type Plasminogen Activator (tPA)in serum free medium from normal human fibroblast cells. This system could maintain high cell density for long periods of steady state conditions in perfusion cultivation. Under normal operating condition, shear stress was as low as 0.65 dynes/$\textrm{cm}^2$ at the agitation speed of 80 rpm. Even though cell density gradually decreased with increasing agitation speed, tPA production increased linearly with increasing shear stress within a moderate range. This culture system allowed production of 2$\mu$g tPA/mL while maintaining a high cell denisty of 1.0$\times$107 viable cell/mL.

• International Journal of Control, Automation, and Systems
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• 제4권6호
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• pp.697-704
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• 2006

The paper is concerned with $H_{\infty}$ filtering for descriptor systems. A necessary and sufficient condition is established in terms of linear matrix inequalities(LMIs) for the existence of normal filters such that the error systems are admissible and the transfer function from the disturbance to the filtering error output satisfies a prescribed $H_{\infty}$-norm bound constraint. When these LMIs are feasible, an explicit parameterization expression of all desired normal filter is given. All these results are yielded without decomposing the original descriptor systems, which makes the filter design procedure simple and direct. Finally, a numerical example is derived to demonstrate the applicability of the proposed approach.