• 한국실천공학교육학회논문지
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• 제4권2호
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• pp.171-175
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• 2012

최근 정보기술을 이용하여 인간의 감정을 인식하고 소통할 수 있는 ICT(Information and Communication Technology)의 연구가 증가하고 있다. 예를 들어 상대방의 마음을 읽기 위해서 그 사람과의 관계를 형성하고 활동을 해야만 하는 시대에서 사회의 디지털화로 그 경험이 디지털화 되어가며 마인드를 리딩 할 수 있는 디지털기기들이 출현하고 있다. 즉, 인간만이 예측할 수 있었던 감정을 디지털 기기가 대신해 줄 수 있게 된 것이다. 얼굴에서의 감정인식은 현재 연구되어지는 여러 가지 감정인식 중에서 효율적이고 자연스러운 휴먼 인터페이스로 기대되고 있다. 본 논문에서는 감성 ICT에 대한 고찰을 하고 그 사례로서 얼굴감정 인식 시스템에 대한 메카니즘을 살펴보고자 한다.

• 한국통신학회논문지
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• 제40권8호
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• pp.1637-1642
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• 2015

차세대 IT융합 응용기술을 이용하여 감성상태를 생체 신호로부터 추출하려는 많은 연구가 진행되고 있으며, 감성이 인간의 감각기능을 통해 생리적인 상태에 영향을 미친다는 사실이 알려지고 있다. 본 논문에서는 생체신호를 이용하여 감성조명을 제어하는 알고리즘을 제안하였다. 감성조명을 위하여 사용된 LED조명은 친환경적이며 고효율 및 긴 수명을 가지고 있다. 특히, LED 조명은 단일 조명구로도 다양한 색표현이 가능한 장점을 가지고 있다. 그리고 인간의 감성을 보다 정확하게 판별하기 위한 생체신호로 뇌파를 사용하였고, 뇌파측정 장비를 사용하여 수집된 뇌파를 분석해 감성을 판단하였다.

• 유공압시스템학회논문집
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• 제4권3호
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• pp.13-21
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• 2007

A forklift is a motive machine powered by LPG, diesel engine or electric motors. The internal combustion engine type forklift is equipped with automatic transmission to meet the required drive load as well as the easy operation of the vehicle. This paper deals with the shift control and endurance test controller which is developed for the functional test of the newly designed automatic transmission on a dynamometer test bench. Its major function is to control the proportional solenoid currents, which is directly related to clutch pressures, for the given reference current trajectory during shift and sequential operation of shift schedule designed for the durability test at each gear. It also has the ability to monitor all the necessary test data through RS232 communication and log them to disk files. The current controller of embedded system is designed from the identified dynamics of solenoid coil and the current reference can be easily modified with a user interface software on PC so as to match the shift data by experiments.

• 센서학회지
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• 제12권4호
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• pp.164-169
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• 2003

최근에 남북철도나 대륙횡단열차 등에 대한 사업성 타당조사가 이뤄지면서 철도차량에 대한 관심이 높아지고 있다. 타교통수단과 비교하여 철도차량은 환경친화적, 정시성, 신뢰성, 그리고 안전성의 특성이 있다. 우리는 한국형 고속철도차량을 평가하기 위한 하드웨어와 소프트웨어를 제작하였다. 소프트웨어는 측정된 데이터를 분석할 수 있도록 해준다. 이 논문에서는 센서를 사용한 철도차량 전기장치 측정에 관해서 연구하였다. 이 시험을 하기 위해서 신호변환시스템을 개발하였다. 이 계측시스템을 이용해서 가선전압, battery전압, 차축속도 등에 관한 중요한 시험결과를 얻을 수 있었다.

• 한국전기전자재료학회논문지
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• 제19권8호
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• pp.701-706
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• 2006

In addition to its similarity to genuine diamond film, diamond-like carbon (DLC) film has many advantages, including its wide band gap and variable refractive index. In this study, DLC films were prepared by the RF PECVD (Plasma Enhanced Chemical Vapor Deposition) method on silicon substrates using methane $(CH_4)$ and hydrogen $(H_2)$ gas. We examined the effects of the post annealing temperature on the structural variation of the DLC films. The films were annealed at temperatures ranging from 300 to $900^{\circ}C$ in steps of $200^{\circ}C$ using RTA equipment in nitrogen ambient. The thickness of the film and interface between film and substrate were observed by surface profiler, field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), respectively. Raman and X-ray photoelectron spectroscopy (XPS) analysis showed that DLC films were graphitized ($I_D/I_G$, G-peak position and $sp^2/sp^3$ increased) ratio at higher annealing temperature. The variation of surface as a function of annealing treatment was verified by a AFM and contact angle method.

• 태양에너지
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• 제20권2호
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• pp.85-96
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• 2000

When the liquid with the additive of ppm unit of a polymer flows, the pressure drop can be manifestly decreased compared to that of pure liquid: that's the drag reduction. This method is that a small amount of a polymer which doesn't make the transformation of the properties of the working fluid is dissolved into the working fluid, the links of chains of the polymer do a buffer action to the molecules of the working fluid which come out between near the wall of the pipe and the interface, so that the pressure drop is dramatically decreased. When we transport the fluid, therefore, we can save a lot of pumping power, or we can increase the transportation capacity with using the same transportation equipment. But when a polymer solution is also flowing in the fluid transportation system, the degradation which have a very close relation with the phenomena of the drag reduction occurs necessarily. When adding polymer to reduce the drag in two phase flow system, It is impossible to find some studies. This study is focussing on a searching examination for the experimental study considering the mechanical degradation in the closed tow phase system to find out the conditions which could improve the pump capacity.

• 유공압시스템학회논문집
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• 제1권2호
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• pp.8-14
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• 2004

Abstract: In the oil hydraulic piston pumps the clearance between the valve plate and cylinder block plays an important role for volumetric and overall efficiency. Thus, adequate lubricational fluid film is needed for the interface. In this study, fluid film thickness is measured by a gap sensor and a slip ring under operational conditions to observe the behavior of the lubrication mechanism in detail. To investigate the effect according to the valve plate types in view of the fluid film, three different types were designed. Leakage flow rate and shaft torque were also measured to clarify the effect according to the valve plate types. A broad range of experiments were conducted to provide reasonable data on the effect of fluid film. In this experiments two main parameters were found, of which the one is the discharge pressure and the other is valve plate geometry. As a result, we found that the spherical valve plate could get more stable fluid film thickness, maintain good efficiency for high pressure range than the other types.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.1013-1014
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• 2006

Mobilecomputer offers more fundamental role than role assistance enemy of modern technology equipment and new Information Technology can reconsider, and reconstruct creatively accuracy of physiological concept. That military register symptoms are developed of disease, before far before rehalibitation, offer possibility that can intervene in process that motive change of military register symptoms after rehalibitation. But, that many parameters become analysis target and mathematical settlement and equalization system of neted data of that is huge, same time collection of all datas can lift difficulty etc.. These main weakness puts in structural relation between elements that compose system. Therefore, dynamics research that time urea of systematic adjustment has selected method code Tuesday nerve dynamics enemy who groping of approach that become analysis point is proper and do with recycling bioelectricity signal. Nature model of do living body signal digital analysis chapter as research result could be developed and scientific foundation groping could apply HSS (Hardware-software system) by rehalibitation purpose. Special quality that is done radish form Tuesday of bioelectricity signal formation furthermore studied, and by the result, fundamental process of bodysignal in do structure circuit form of analog - digital water supply height modelling do can

• Corrosion Science and Technology
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• 제9권6호
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• pp.289-293
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• 2010

To investigate the corrosion behavior of tools steel surface in various coating film, the surface of hard coated Ti-Zr-N film on the tool steel by using magnetron-sputtering methods was researched using various experimental methods. STD 61 steels were manufactured by using vacuum furnace and solutionized for 1hr at $1050^{\circ}C$. Steel surface was coated with Ti-Zr-N film at $150^{\circ}C$ and 100W for 1h by using DC-sputtering equipment. Surface characteristics of Ti-Zr-N film coated specimens were investigated by OM, XRD, FE-SEM and nano-scratch tester. And corrosion behaviors of the coated specimen were investigated by polarization test and electrochemical impedance spectroscopy(EG&G Co, PARSTAT 2273. USA). It was found that Ti-Zr-N film coated sample had a thick coated layer and showed a good wear resistance and corrosion resistance of surface compared with ZrN and TiN coated sample. The corrosion resistance and mechanical property of Ti-Zr-N film coated STD 61 alloy increased as sputtering time increased.

• Journal of Magnetics
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• 제22권1호
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• pp.133-140
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• 2017

Split magnetic fluid sealing is a combination of magnetic fluid rotary and plane sealing. Using the theory of equivalent magnetic circuit design as basis, the author theorized the pressure resistance performance of magnetic fluid plane sealing. To determine the pressure resistance of magnetic fluid plane sealing, the author adopted the method of finite element analysis to calculate the magnetic field intensity in the gap between plane sealing structures. The author also analyzed the effect of different sealing gaps, as well as different ratios between the sealing gap and tooth and solt width, on the sealing performance of split magnetic fluid. Results showed that the wider the sealing gap, the lower the sealing performance. Tooth width strongly affects sealing performance; the sealing performance is best when the ratio between tooth width and sealing gap is 2, whereas the sealing performance is poor when the ratio is over 8. The sealing performance is best when the ratio between the solt width and sealing gap is 4, indicating a slight effect on sealing performance when the ratio between the solt width and sealing gap is higher. Theoretical analysis and simulation results provide reference for the performance evaluation of different sealing equipment and estimation of critical pressure at interface failure.