• 한국산학기술학회논문지
• /
• 제17권3호
• /
• pp.724-731
• /
• 2016

본 연구는 지반공학이론과 생체공학이론을 융합시켜 지반과 발의 상호거동에 대하여 학제간 융합 메카니즘을 개발하는 연구이다. 지반공학 분야에서 널리 적용되고 있는 팽이기초(Conical top foundation)의 메카니즘을 이용하여 단단한 지반 및 연약한 지반에서의 안전하고 편안한 보행이 가능하게 하는 신개념 신발을 개발하였다. 새롭게 개발된 신발에 대한 검증을 위하여 실험적으로 확인하였다. 실험을 수행하기 위하여 이 연구에서 개발된 융합이론에 따라 신개념 신발을 설계하고 시제품을 제작하였다. 또한 연약한 지반과 단단한 지반으로 구분하여 인공지반을 조성하고 보행 시 일반적인 기존신발과 신개념 신발의 족저압에 대하여 특수한 측정 장비를 이용하여 측정하였다. 실험 결과로 부터 신개념 신발의 실질적인 거동과 이론적인 예측이 매우 일치한다는 것을 확인하였다. 따라서 융합 메카니즘이 적용된 신개념 신발의 경우 강도와 강성이 불규칙적인 지반의 경우에도 위치별로 팽이원추부에 의하여 지반의 특성에 따라 상호거동에 의한 평형상태로 유지하도록 보행 시 하중전이가 발생하여 인체공학적으로 발바닥에 가해지는 압력이 균등해져서 안정된 보행을 할 수 있다는 것을 확인하였다. 또한 본 연구는 향후 새로운 형태의 다양한 학제간 융합 메카니즘을 개발하는데 유용하게 이용될 것으로 기대 된다.

• Journal of Microbiology and Biotechnology
• /
• 제7권5호
• /
• pp.360-362
• /
• 1997

A transposon Tn5 mutant of Rhodobacter sphaeroides 2.4.1 was isolated for its impaired ability of growth on minimal medium containing ${\beta}$-hydroxybutyric acid as a sole carbon source. The mutant, R. sphaeroides S7 showed approximately 6-fold decrease in ${\beta}$-hydroxybutyrate dehydrogenase activity compared with that of wild type. In R. sphaeroides S7 the Tn5 was located in DNA region corresponding to a 4.2-kb EcoRI DNA fragment of R. sphaeroides 2.4.1 chromosome.

• 한국경영과학회지
• /
• 제24권2호
• /
• pp.41-51
• /
• 1999

In sole-source procurement contraction for government goods and services, the buyer (government) needs to derive the optimal actions from the contractor so the buyer can obtain the maximum utility and the contractor, or single-source supplier, is guaranteed the equivalent of a minimum level of profit. Under the assumption of risk-neutrality for both the buyer and the contractor and the buyer's unobservability of the contractor's action, it is necessary for the buyer to design a (mathematical) model to achieve the above objective. This paper considers the mathematical formulation in which two problems - moral hazard and adverse selection - are present simultaneously; furthermore, from the formulation, a GAMS (General Algebraic Modeling System) program is used for a possible buyer to obtain the optimal actions.

• 한국전산유체공학회:학술대회논문집
• /
• 한국전산유체공학회 2004년도 추계 학술대회논문집
• /
• pp.137-139
• /
• 2004

The monopropellant hydrazine thrusters are widely used for the satellite on-board propulsion system fulfilling various missions in space. They have outstanding features caused by the nearly unlimited restart capability and the very high credibility. The sole monopropellant thruster used at precent in nation is MRE-1 that is a standard component of NASA. It can produce 4.45 N of nominal thrust. Due to the glowing complexity with a satellite mission, the needs for thrusters of the diverse performance are being increased. The numerical simulation could give useful information to develop a new type thruster instead of the experiments performed previously. Therefore it is critical to make a reliable computer code to prepare design change of a thruster. In this paper, the performance analysis and validation of the satellite monopropellant hydrazine thruster currently used is accomplished as the preliminary study to serve valuable data for future design change.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2000년도 춘계학술대회 논문집
• /
• pp.566-569
• /
• 2000

This hybrid position/force control for the dynamic walking of the biped robot is performed in this paper. After the biped robot was modeled with 14 degrees of freedom of the multibody dynamics, the equations of motion are constructed using velocity transformation technique. Then the inverse dynamic analysis is performed for determining the driving torques and the ground reaction forces. From this analysis, obtains the maximum ground contact force at the moment of contacting which act on the rear of the sole of swing leg and the distribution curve of the ground reaction. Because these maximum force and distribution type acts an important role to the stability of the whole dynamic walking, they are reduced and distributed smoothly by means of the trajectory of the modified ground reaction force. This new trajectory is used to the reference input for more stable dynamic walking of the whole walking region.

• 미생물학회지
• /
• 제38권4호
• /
• pp.245-245
• /
• 2002

Catabolic pathways for the degradation of various aromatics by Sphingomonas yanoikuyae Bl are intertwined, joining at the level of substituted benzoates, which are further degraded vita ring cleavage reactions. The mutant strain EK497, which was constructed by deleting a large DNA region containing most of the genes for biphenyl, naphthalene, m-xylene, and m-toluate degradation, was unable to grow on all of the aromatics tested except for benzoate as the sole source of carbon and energy.S. yanoikuyae EK497 was found to possess only catechol ortho-ring cleavage activity due to deletion of the genes for the meta-cleavage pathway. Wild-type S. yanoikuyae Bl grown on benzoate has both catechol orthoand meta-cleavage activity. However, m-xylene and m-toluate, which are metabolized through methylbenzoate, and biphenyl, which is metabolized through benzoate, induce only the meta-cleavage pathway, suggesting the presence of a substrate-dependent induction mechanism.

• 대한인간공학회지
• /
• 제11권2호
• /
• pp.23-33
• /
• 1992

The distribution of the pressure between the sole of a feet and a supporting surface can reveal the information about the structure and fonction of the foot and the posural control of the whole body. In particular, the measurement of the vertical contact forces between the plantar surface of the foot and the shoe insole is of great importance to reveal the loading distributio patterns incurred from a particular shoe midsole design. In order to investigate the plantar surface pressure distribution, an insole-type sensor with a piezoelectric material is developed and tested. The present paper describes a new method to completely reduce both the shear force and pyroelectric effects that are normally caused from piezoelectric materials.

• Asian-Australasian Journal of Animal Sciences
• /
• 제29권6호
• /
• pp.838-844
• /
• 2016

This study assessed the influence of genetic type (Embden-Anser anser, EE; Toulouse-Anser anser, TT and F1 cross, ET) for meat characteristics (carcass, meat quality and fatty acid (FA) profiles), of domestic geese "Anser anser domesticus" raised in dehesa as an alternative, organic feeding system. Carcass and breast muscle weight (p<0.01) were greater for the ET group at the same live weight. None of the groups showed differences in the production of fatty liver with this type of feeding. Higher values were found for maximum Warner-Bratzler shear force (between 7.62 and $8.87kg/cm^2$), which implies the improvement of this parameter. High levels of oleic FAs were obtained, especially for the TT group. The polyunsaturated/saturated FA ratio was highest for the ET group (p<0.001), reflecting the optimum nutritional values as a component of a healthy consumer diet.

• 마이크로전자및패키징학회지
• /
• 제10권4호
• /
• pp.53-60
• /
• 2003

CCD(Charge-Coupled Device) wafer와 같이 표면이 polymer 성분의 micro lens로 구성되어있는 경우 passivation 막을 도포하지 않는 것이 보통인데, 이때 particle이 lens 표면에 쉽게 달라붙는 현상이 나타나게 된다. 특히 sawing 하면서 발생하는 particle은 치명적인 불량을 유발한다. 본 연구에서는 sawing에서 발생한 particle을 효과적으로 flushing하기위한 방안으로 측면노즐과 중심노즐의 분사위치, 분사각도, 퍼짐각도를 최적화 하고, 아울러 flushing 노즐을 추가한 새로운 형태의 wafer saw를 도입하였다. 개선된 saw를 적용하여 실험한 결과 particle로 인한 CCD chip의 불량률이 9.l%로부터 0.63%로 현격하게 개선되었음을 확인할 수 있었다.

• ETRI Journal
• /
• 제17권3호
• /
• pp.17-43
• /
• 1995

We present a comprehensive derivation of the transport of holes involving an interacting two-valence-band system in terms of a generalized relaxation time approach. We sole a pair of semiclassical Boltzmann equations in a general way first, and then employ the conventional relaxation time concept to simplify the results. For polar optical phonon scattering, we develop a simple method th compensate for the inherent deficiencies in the relaxation time concept and apply it to calculate effective relaxation times separately for each band. Also, formulas for scattering rates and momentum relaxation times for the two-band model are presented for all the major scattering mechanisms for p-type GaAs for simple, practical mobility calculations. Finally, in the newly proposed theoretical frame-work, first-principles calculations for the Hall mobility and Hall factor of p-type GaAs at room temperature are carried out with no adjustable parameters in order to obtain a direct comparison between the theory and recent available experimental results, which would stimulate further analysis toward better understanding of the complex transport properties of the valence band. The calculated Hall mobilities show a general agreement with our experimental data for carbon doped p-GaAs samples in a range of degenerate hole densities. The calculated Hall factors show $r_H$=1.25~1.75 over all hole densities($2{\times}10^{17}{\sim}1{\times}10^{20}cm^{-3}$ considered in the calculations.