• 한국신재생에너지학회:학술대회논문집
• /
• 2010.11a
• /
• pp.132.1-132.1
• /
• 2010

자원고갈과 지구온난화 등으로 재생에너지의 사용 및 보급이 지속적으로 증가할 것으로 예상되지만, 세계적으로 매장량이 풍부한 석탄의 사용량은 2030년 이후에도 지속적으로 증가될 전망이다. 따라서 세계 각국은 기후변화 규제에 대응하면서도 청정하게 석탄을 사용하기 위한 기술의 개발 및 보급을 활발히 진행 중이며, 국내에서도 온실가스 감축과 동시에 국가 성장 동력화를 추진하고 있다. 석탄가스화 기술은 석탄을 가스화하여 생산된 CO, $H_2$가 주성분인 합성가스를 연료로 활용하는 기술로, 이용 효율이 높고 석탄을 천연가스 수준으로 청정하게 사용할 수 있는 차세대 석탄이용 기술이다. 본 연구에서는 pilot급 석탄 가스화기에서 생산된 합성가스에 함유된 산성가스를 고온에서 건식으로 제거하는 시스템을 구축하였으며, 석탄 합성가스를 고온 건식 정제시스템에 공급하기 위한 석탄가스화기의 운전특성을 파악하였다.

• The Journal of Korea Assosiation for Disability and Oral Health
• /
• v.3 no.2
• /
• pp.97-100
• /
• 2007

In patients with cerebral palsy, dental treatments, which require absolute patient's corporation, have many difficulties because of muscle spacity, involuntary muscle movements and spasm. Especially in endodontic treatments which very meticulous instrumentation is needed, these muscle discordances may lead to unexpected accidents such as tissue damage while filing, over-instrumentation and swallowing instruments. Also, taking radiographs for measuring canal length is often hindered by walking and movement disorders. This paper is to present a clinical case of one-visit root canal treatment using electrical apex locator under general anesthesia in a cerebral palsy patient.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.6 no.3
• /
• pp.11-17
• /
• 1998

In this study, a procedure is presented for the dynamic analysis of a multibody tracked vehicle system. the planner tracked vehicle model used in this investigation is assumed to consist of two kinematically decoupled subsystems, i.e., the chassis subsys- tem and track sub-system. The chassis subsystem includes the chassis frame, sprocket, idler and rollers, while the track subsystem is represented as a closed kinematic chain consisting of rigid links interconnected by revolute joints. The recursive kinematic and dynamic formulation module of the vehicle will be developed.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.9 no.1
• /
• pp.205-215
• /
• 2001

In this study, modeling and analysis procedure for the dynamic analysis of a high mobility tracked vehicle system were studied. The vehicle model used in this investigation is assumed to be consist of two kinematically decoupled subsystems. The chassis subsystem consists of chassis frame, sprocket, support rollers, road wheels, idler wheel, road wheel arms and idle wheel arm, while the track subsystem is represented as a closed kinematic chain consisting of track links and end connectors interconnected by revolute joints with bushing. Nonlinear contact force module describing the interaction between track link, and sprocket, idler wheel, road wheel, support roller, ground was used. The effects of road wheel arms and idler wheel arm due to tension adjuster are also considered.

• Annual Conference on Human and Language Technology
• /
• 1997.10a
• /
• pp.375-380
• /
• 1997

"모든 사람은 죽는다"라는 믿음을 내용으로 하는 마음의 상태가 "그 사람도 죽는다"라는 믿음을 내용으로 하는 마음의 상태를 인과적으로 야기하는가? 두 믿음 사이의 미시적 얼개가 인과 관계를 골자로 하고 있다는 사실에서 그 미시적 얼개에 수반하는 거시적 얼개도 인과 관계라는 사실이 함축되는가? 거시적 얼개를 물리적 관점에서 보자면 두 믿음 사이의 관계는 인과적이다. 그러나 거시적 얼개의 포인트는 미시적 얼개와는 달리 물리적 인과성에만 맞춰져 있지 않다. 한 믿음에서 다른 믿음으로의 이행에서 그 포인트는 믿음의 신경생리학적 토대가 아니라 믿음의 의미에 있다. 따라서 양자 사이의 이행 관계는 추론이나 바램 등과 같은 인간의 해석적 의미 연관의 관점에서 서술되는 것이 더 자연스럽고 이치에 맞는다.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.28 no.8 s.227
• /
• pp.984-988
• /
• 2004

This study presents the process of the solenoid parameter estimation of an common-rail injector fer HSDI(High Speed Direct Injection) diesel engines. The EMF(Electromotive Force) and solenoid inductance are the major parameters for presenting the injector dynamics, and also these parameters are estimated by using a multi-layer feedforward artificial neural networks(ANN). The performances of parameter estimators are verified by the simulation with injector model. The feasibility of this methodology is closely examined through the simulation in the various operating points of injector. The simulation results have revealed that estimated parameters show favorable agreements with the common-rail injector model.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
• /
• 1998.05a
• /
• pp.9-14
• /
• 1998

석탄가스화 복합발전시스템(Integrated Gasification Combined Cycle, IGCC)은 기존의 미분탄 연소 발전 방식에 비해 발전효율이 5-10%이상 높고, 공해물질 배출 특성에 있어서도 SOx와 NOx를 각각 95% 및 75% 이상 감소시키고 재는 용응 슬러 형태로 처리하는 발전시스템이다. 이와 같은 고효율 및 환경 친화적인 특성으로 인하여 IGCC 시스템은 차세대 석탄화력 발전 방식으로서 각광받고 있으며, 이미 선진 공업국들은 70년대 석유파동 이후 IGCC 기술의 개발을 활발히 진행하여, 최근에는 250MW 이상 출력의 상용화급 플랜트를 가동 또는 건설 중에 있으며, 머지않아 상업화에 도달할 전망이다. 또한 국내에서도 최근 전력 수요의 급증과 전 세계적으로 확산되고 있는 환경 규제의 강화 등으로 우리의 실정에 맞는 IGCC 공정의 개발이 활발히 진행되고 있다. (중략)

• Transactions of the Korean Society of Automotive Engineers
• /
• v.6 no.5
• /
• pp.138-145
• /
• 1998

Recently, TCS(Traction Control System) is attracting attention, because it maintains traction ability and steerability of vehicles on low-$\mu$ surface roads by controlling the slip rate between tire and road surface. The development of TCS control law is difficult due to the highly nonlinearity and uncertainty involved in TCS. A fuzzy logic approach is appealing for TCS. In this paper, fuzzy logic controller for TCS is introduced and evaluated by the computer simulation with 8 DOF vehicle model. The result indicate that the fuzzy logic TCS improves vehicle's stability and steerability.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2002.05a
• /
• pp.305-308
• /
• 2002

The mechanics, electronics and manufacturing technology have been developed rapidly. Nowadays vehicle stability becomes more and more important then ABS (Anti-lo7k Brake System), ASR (Anti-Slip Regulator), TCS, (Traction Control System), ESP (Electronic Stability Program), and VDC (Vehicle Dynamic Control) which actively control the vehicle stability actively has been improved. In this study, instead of automatic transmission, CVT (Continuously Variable Transmission) is used because of the continuously gear ratio changes. It can effectively transfer the torque from engine to tire more than other gear transmission. The modeling is simplified assuming that there are no resistance parameters.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2002.05a
• /
• pp.353-356
• /
• 2002

In vehicle accidents, the rolling, pitching, and yawing which are produced by collisions affect the motions of vehicle. Therefore, vehicle behavior under impact situation should be analyzed in three-dimension. In this study, three-dimensional vehicle dynamic equations based on impulse-momentum conservation principles under vehicle impact are introduced for simulation. This analysis has been performed by the real vehicle impact data from JARI and RICSAC. This study suggested each system modeling such as suspension, steering, brake and tire as well as the appropriate vehicle behavior simulation model with respect to pre and post impact.