• 한국강구조학회 논문집
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• 제9권3호통권32호
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• pp.421-430
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• 1997

본 연구에서는 숏브라스트한 후 무기징크 페인트로 도장한 무기징크면, 연마면, 흑피면에 대하여 정적 및 피로시험을 수행하여 기존의 연구결과와 비교평가함으로써 마찰면의 표면상태에 따른 고장력볼트 마찰이음부의 정적 및 피로거동을 규명하고자 하였다. 본 연구의 목적을 달성하기 위하여 일련의 정적 및 피로시험을 실시하고 토크관리법의 타당성 평가, 미끄러짐계수의 도출, 도입축력의 감소률 규명, 피로강도의 평가, 마찰면의 압축력 분포 조사 등을 수행하였다. 본 실험결과와 기존 연구자들의 연구결과를 종합적으로 검토한 결과 볼트의 설계축력 도입을 위한 토크관리법은 타당하며, 시간경과 및 반복하중의 작용에 따른 축력감소율을 고려할 때 설계축력의 110%로 초기축력을 도입하도록 규정한 시방서 기준은 적합한 것으로 평가되었다. 시간경과에 따른 도입축력의 초기감소율은 경과시간의 상용로그에 비례하는 것으로 나타났으며, 도입직후 약 20시간이 경과하면 일정한 값으로 수렴되고 있음을 알 수 있었고 이들은 마찰면의 표면조도와는 상관관계가 없는 것으로 평가되었다. 미끄러짐계수는 연마면, 무기징크프라이머 도포면, 흑피면 순으로 크게 나타났으며 미끄러짐하중은 도입축력에 크게 좌우되나 도입축력이 크면 마찰면의 표면조도의 손상으로 인하여 미끄러짐계수가 작아져 도입축력과 미끄러짐하중 사이에는 선형적 비례관계가 성립되지 않음을 알 수 있었다. 마찰면의 압축력 분포를 조사한 결과 내측볼트 주변의 마찰면적이 외측볼트 주변보다 응력방향에 있어서 더 넓게 분포하고 있는 것을 알 수 있었으며, 이는 외측볼트로부터 마찰접합에서 지압접합으로 천이되고 있는 것으로 판단된다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제53권4호
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• pp.237-246
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• 2004

The advantages of the Magnetic Fluid Linear Pump(MFLP) is that this device could Pump the non-conductive. non-magnetic liquid such as Insulin or blood because of the segregation structure of the magnetic fluid and pumping liquid. In this device. the sequential currents are needed to Produce pumping forces so that Pumping Forces and Pumping speed mainly depend on the current Patterns. The excessive forces at Pumping moment could cause the medical shock, and weak forces at intermediate moment could cause the back flow or the pumping liquid. So the ripples of the pumping forces need to be reduced for the medical application. In this research, the driving characteristics in the MFLP by operating current is analysed. The change of magnetic fluid surface according to the driving currents could be obtained be magneto-hydrodynamic analysis so that Pumping fortes could be computed by integration of the surface moving to the pumping direction at each moment. The actual MFLP with 13mm diameter was made and tested for experiments. The effects of driving current and frequency on the pumping forces and pumping speed were analyzed and compared with experimental measurements.

• Structural Engineering and Mechanics
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• 제56권3호
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• pp.491-506
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• 2015

Propagation of the generalized Rayleigh waves in an initially stressed elastic half-space covered by an elastic layer is investigated. It is assumed that the initial stresses are caused by the uniformly distributed normal compressional forces acting on the face surface of the covering layer. Two different cases where the compressional forces are "dead" and "follower" forces are considered. Three-dimensional linearized theory of elastic waves in initially stressed bodies in plane-strain state is employed and the elasticity relations of the materials of the constituents are described through the Murnaghan potential where the influence of the third order elastic constants is taken into consideration. The dispersion equation is derived and an algorithm is developed for numerical solution to this equation. Numerical results for the dispersion of the generalized Rayleigh waves on the influence of the initial stresses and on the influence of the character of the external compressional forces are presented and discussed. These investigations provide some theoretical foundations for study of the near-surface waves propagating in layered mechanical systems with a liquid upper layer, study of the structure of the soil of the bottom of the oceans or of the seas and study of the behavior of seismic surface waves propagating under the bottom of the oceans.

• 대한기계학회논문집
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• 제12권4호
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• pp.705-711
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• 1988

본 연구에서는 대구중공업(주)의 대형선반 베드면 재질과 동일한 회수철(KS D4301 GC30)시편을 선삭가공하고 볼베어링의 레이스를 이용한 구조로 설계된 볼형 표 면로울링기구를 사용하여 로울러 다듬질을 행함으로서 전가공에 따른 가압력이 표면조 도에 미치는 영향을 구명하는데 목적을 두었으며 아울러 로울링 회수에 따른 표면조도, 경도 및 직경의 변화량을 실험적으로 구명하였다.

• Journal of Pharmaceutical Investigation
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• 제15권2호
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• pp.45-52
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• 1985

For the model tablets using mannitol and Avicel PH 101 as excipients, the patterns of disintegration and dissolution from the differences of physical properties were investigated. It was found that the patterns in the dissolution and binding forces in the interaction of materials by estimates of solid-solid or liquid surface free energy due to cohesive or adhesive properties of materials, and solid surface free energy in binding forces of tablet should be considered as an important factor in dissolution processes.

• 대한조선학회지
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• 제22권2호
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• pp.27-34
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• 1985

In this paper, the second order time mean forces acting on the circular cylinder floating on the free surface of a finite water depth are calculated. Under the assumption that fluid is idea and the wave the linear gravity wave, the velocity potential is calculated by the source distribution method, and the second order time mean lateral and vertical drifting forces are calculated by the direct integration of fluid pressures over the immersed body surface. The comparison of the lateral drifting forces with Rhee's results by momentum theorem shows good agreements. And it is shown that the second order time sinkage forces of a floating circular cylinder cross zero for all water depths.

• Advances in concrete construction
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• 제13권3호
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• pp.255-264
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• 2022

Vibration is expected to occur in microtubules as tubular heterodimers. They oscillate like electric dipoles. Several research studies have estimated a frequency of vibration using the orthotropic model, a beam or rod like models and shell models, considering the surface forces. The effects of body forces on the dynamics of the microtubules were not yet taken into account. This study seeks to capture the body force effects on the vibration modes generated and on the corresponding frequency for microtubules. An orthotropic elastic shell model for the structural details of microtubules is used for the analysis. The tests are conducted out for microtubules, exposed to electro-magnetic and gravitational forces, the transverse vibration, radial mode vibration, and axial mode of vibration have accomplished. We therefore, evaluate and compare microtubules' frequencies with prior results of vibration frequency without the effects of body force.

• Bulletin of the Korean Chemical Society
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• 제32권8호
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• pp.2611-2616
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• 2011

We studied the physical properties of the mercaptopyruvic-acid layer formed on gold surfaces, which has the interactions with the titanium dioxide surface for design of gold- titanium dioxide distribution. Surface force measurements were performed, using the atomic force microscope (AFM), between the surfaces as a function of the salt concentration and pH value. The forces were analyzed with the DLVO (Derjaguin-Landau-Verwey-Overbeek) theory, to evaluate the potential and charge density of the surfaces quantitatively for each salt concentration and each pH value. The difference in the properties reflected the effect of the isoelectric point on the surface forces. The forces were interpreted for the evaluation with the law of mass action and the ionizable groups on the surface. The salt concentration dependence of the surface properties, found from the measurement at pH 8.0, was consistent with the prediction from the law. It was found that the mercaptopyruvic-acid layer had higher values for the surface charge densities and potentials than the titanium dioxide surfaces at pH 8, which may be attributed to the ionized-functional-groups of the mercaptopyruvic-acid layer.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1768-1771
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• 2003

Hard turning replaces grinding for finishing process with expectations of higher productivity and demanded surface quality. Especially for the surface roughness as surface quality demanded in finishing process of hard turning, know-how of machining characteristics of hardened materials by cutting force analysis should be accumulated in company with achievement of precision of elements and high stiffness design technology in hard turning. Considering chip formation mechanism of hardened materials, adequate cutting conditions are selected for machining experiments and cutting forces are measured according to cutting conditions. Increase of cutting forces especially thrust force and increase of dynamic instability could occur in hard turning. Analysis of dynamic characteristics of the cutting forces is executed to investigate relation between dynamic instability and surface roughness in hard turning. Investigation on effects of relative motion of machining system generated by vibration due to dynamic instability shows that ultimate surface roughness could be predicted considering relative motion of machining system with geometrical surface roughness.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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• pp.48-51
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• 2004

This paper is to study the response of flat plate slab-column connections consisting of various types of shear reinforcement and steel plate subjected to gravity loadings, mainly punching shear forces using the non-destructive testing, spectral analysis of surface waves and structural experiments. The base specimen failed due to punching shear generated from the gravity. The three other types of slab shear reinforcement and steel plate showed effective in resisting punching shear for these types of connections under gravity loading. This study has focused in evaluating the velocity response of a Surface wave during the early age as the poured concrete specimens have been hardened, the possibility of damage detection in the slab-column connection and the relationship between the punching shear forces and the surface wave velocities under the condition that the punching shear forces had gradually increased until the flat plate slab in slab-column connection had been failed.